Restructure projectHEADmain

17 files changed, 17822 insertions, 0 deletions

diff --git a/contrib/cgltf-tangents/CMakeLists.txt b/contrib/cgltf-tangents/CMakeLists.txt
new file mode 100644
index 0000000..2c0771e
--- /dev/null
+++ b/contrib/cgltf-tangents/CMakeLists.txt
@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.0)
+
+project(cgltf-tangents)
+
+add_library(cgltf-tangents
+  cgltf_tangents.c
+  MikkTSpace/mikktspace.c)
+
+target_include_directories(cgltf-tangents PUBLIC
+  ${CMAKE_CURRENT_SOURCE_DIR})
+
+target_link_libraries(cgltf-tangents PUBLIC
+  cgltf)
diff --git a/contrib/cgltf-tangents/LICENSE b/contrib/cgltf-tangents/LICENSE
new file mode 100644
index 0000000..7796e37
--- /dev/null
+++ b/contrib/cgltf-tangents/LICENSE
@@ -0,0 +1,79 @@
+This project has two third-party dependencies:
+- MikkTSpace
+- cgltf
+
+The license for this project and its dependencies are included below.
+
+--------------------------------------------------------------------------------
+cgltf-tangents
+--------------------------------------------------------------------------------
+
+Copyright 2022 Marc Sunet
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation and/or
+other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+--------------------------------------------------------------------------------
+MikkTSpace
+--------------------------------------------------------------------------------
+
+Copyright (C) 2011 by Morten S. Mikkelsen
+
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+
+3. This notice may not be removed or altered from any source distribution.
+
+--------------------------------------------------------------------------------
+cgltf
+--------------------------------------------------------------------------------
+
+Copyright (c) 2018-2021 Johannes Kuhlmann
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/contrib/cgltf-tangents/MikkTSpace/README.md b/contrib/cgltf-tangents/MikkTSpace/README.md
new file mode 100644
index 0000000..9fda155
--- /dev/null
+++ b/contrib/cgltf-tangents/MikkTSpace/README.md
@@ -0,0 +1,4 @@
+# MikkTSpace
+A common standard for tangent space used in baking tools to produce normal maps.
+
+More information can be found at http://www.mikktspace.com/.
diff --git a/contrib/cgltf-tangents/MikkTSpace/mikktspace.c b/contrib/cgltf-tangents/MikkTSpace/mikktspace.c
new file mode 100644
index 0000000..0342ae0
--- /dev/null
+++ b/contrib/cgltf-tangents/MikkTSpace/mikktspace.c
@@ -0,0 +1,1899 @@
+/** \file mikktspace/mikktspace.c
+ *  \ingroup mikktspace
+ */
+/**
+ *  Copyright (C) 2011 by Morten S. Mikkelsen
+ *
+ *  This software is provided 'as-is', without any express or implied
+ *  warranty.  In no event will the authors be held liable for any damages
+ *  arising from the use of this software.
+ *
+ *  Permission is granted to anyone to use this software for any purpose,
+ *  including commercial applications, and to alter it and redistribute it
+ *  freely, subject to the following restrictions:
+ *
+ *  1. The origin of this software must not be misrepresented; you must not
+ *     claim that you wrote the original software. If you use this software
+ *     in a product, an acknowledgment in the product documentation would be
+ *     appreciated but is not required.
+ *  2. Altered source versions must be plainly marked as such, and must not be
+ *     misrepresented as being the original software.
+ *  3. This notice may not be removed or altered from any source distribution.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <math.h>
+#include <string.h>
+#include <float.h>
+#include <stdlib.h>
+
+#include "mikktspace.h"
+
+#define TFALSE          0
+#define TTRUE           1
+
+#ifndef M_PI
+#define M_PI    3.1415926535897932384626433832795
+#endif
+
+#define INTERNAL_RND_SORT_SEED          39871946
+
+// internal structure
+typedef struct {
+        float x, y, z;
+} SVec3;
+
+static tbool                    veq( const SVec3 v1, const SVec3 v2 )
+{
+        return (v1.x == v2.x) && (v1.y == v2.y) && (v1.z == v2.z);
+}
+
+static SVec3            vadd( const SVec3 v1, const SVec3 v2 )
+{
+        SVec3 vRes;
+
+        vRes.x = v1.x + v2.x;
+        vRes.y = v1.y + v2.y;
+        vRes.z = v1.z + v2.z;
+
+        return vRes;
+}
+
+
+static SVec3            vsub( const SVec3 v1, const SVec3 v2 )
+{
+        SVec3 vRes;
+
+        vRes.x = v1.x - v2.x;
+        vRes.y = v1.y - v2.y;
+        vRes.z = v1.z - v2.z;
+
+        return vRes;
+}
+
+static SVec3            vscale(const float fS, const SVec3 v)
+{
+        SVec3 vRes;
+
+        vRes.x = fS * v.x;
+        vRes.y = fS * v.y;
+        vRes.z = fS * v.z;
+
+        return vRes;
+}
+
+static float                    LengthSquared( const SVec3 v )
+{
+        return v.x*v.x + v.y*v.y + v.z*v.z;
+}
+
+static float                    Length( const SVec3 v )
+{
+        return sqrtf(LengthSquared(v));
+}
+
+static SVec3            Normalize( const SVec3 v )
+{
+        return vscale(1 / Length(v), v);
+}
+
+static float            vdot( const SVec3 v1, const SVec3 v2)
+{
+        return v1.x*v2.x + v1.y*v2.y + v1.z*v2.z;
+}
+
+
+static tbool NotZero(const float fX)
+{
+        // could possibly use FLT_EPSILON instead
+        return fabsf(fX) > FLT_MIN;
+}
+
+static tbool VNotZero(const SVec3 v)
+{
+        // might change this to an epsilon based test
+        return NotZero(v.x) || NotZero(v.y) || NotZero(v.z);
+}
+
+
+
+typedef struct {
+        int iNrFaces;
+        int * pTriMembers;
+} SSubGroup;
+
+typedef struct {
+        int iNrFaces;
+        int * pFaceIndices;
+        int iVertexRepresentitive;
+        tbool bOrientPreservering;
+} SGroup;
+
+// 
+#define MARK_DEGENERATE                         1
+#define QUAD_ONE_DEGEN_TRI                      2
+#define GROUP_WITH_ANY                          4
+#define ORIENT_PRESERVING                       8
+
+
+
+typedef struct {
+        int FaceNeighbors[3];
+        SGroup * AssignedGroup[3];
+        
+        // normalized first order face derivatives
+        SVec3 vOs, vOt;
+        float fMagS, fMagT;     // original magnitudes
+
+        // determines if the current and the next triangle are a quad.
+        int iOrgFaceNumber;
+        int iFlag, iTSpacesOffs;
+        unsigned char vert_num[4];
+} STriInfo;
+
+typedef struct {
+        SVec3 vOs;
+        float fMagS;
+        SVec3 vOt;
+        float fMagT;
+        int iCounter;   // this is to average back into quads.
+        tbool bOrient;
+} STSpace;
+
+static int GenerateInitialVerticesIndexList(STriInfo pTriInfos[], int piTriList_out[], const SMikkTSpaceContext * pContext, const int iNrTrianglesIn);
+static void GenerateSharedVerticesIndexList(int piTriList_in_and_out[], const SMikkTSpaceContext * pContext, const int iNrTrianglesIn);
+static void InitTriInfo(STriInfo pTriInfos[], const int piTriListIn[], const SMikkTSpaceContext * pContext, const int iNrTrianglesIn);
+static int Build4RuleGroups(STriInfo pTriInfos[], SGroup pGroups[], int piGroupTrianglesBuffer[], const int piTriListIn[], const int iNrTrianglesIn);
+static tbool GenerateTSpaces(STSpace psTspace[], const STriInfo pTriInfos[], const SGroup pGroups[],
+                             const int iNrActiveGroups, const int piTriListIn[], const float fThresCos,
+                             const SMikkTSpaceContext * pContext);
+
+static int MakeIndex(const int iFace, const int iVert)
+{
+        assert(iVert>=0 && iVert<4 && iFace>=0);
+        return (iFace<<2) | (iVert&0x3);
+}
+
+static void IndexToData(int * piFace, int * piVert, const int iIndexIn)
+{
+        piVert[0] = iIndexIn&0x3;
+        piFace[0] = iIndexIn>>2;
+}
+
+static STSpace AvgTSpace(const STSpace * pTS0, const STSpace * pTS1)
+{
+        STSpace ts_res;
+
+        // this if is important. Due to floating point precision
+        // averaging when ts0==ts1 will cause a slight difference
+        // which results in tangent space splits later on
+        if (pTS0->fMagS==pTS1->fMagS && pTS0->fMagT==pTS1->fMagT &&
+           veq(pTS0->vOs,pTS1->vOs)     && veq(pTS0->vOt, pTS1->vOt))
+        {
+                ts_res.fMagS = pTS0->fMagS;
+                ts_res.fMagT = pTS0->fMagT;
+                ts_res.vOs = pTS0->vOs;
+                ts_res.vOt = pTS0->vOt;
+        }
+        else
+        {
+                ts_res.fMagS = 0.5f*(pTS0->fMagS+pTS1->fMagS);
+                ts_res.fMagT = 0.5f*(pTS0->fMagT+pTS1->fMagT);
+                ts_res.vOs = vadd(pTS0->vOs,pTS1->vOs);
+                ts_res.vOt = vadd(pTS0->vOt,pTS1->vOt);
+                if ( VNotZero(ts_res.vOs) ) ts_res.vOs = Normalize(ts_res.vOs);
+                if ( VNotZero(ts_res.vOt) ) ts_res.vOt = Normalize(ts_res.vOt);
+        }
+
+        return ts_res;
+}
+
+
+
+static SVec3 GetPosition(const SMikkTSpaceContext * pContext, const int index);
+static SVec3 GetNormal(const SMikkTSpaceContext * pContext, const int index);
+static SVec3 GetTexCoord(const SMikkTSpaceContext * pContext, const int index);
+
+
+// degen triangles
+static void DegenPrologue(STriInfo pTriInfos[], int piTriList_out[], const int iNrTrianglesIn, const int iTotTris);
+static void DegenEpilogue(STSpace psTspace[], STriInfo pTriInfos[], int piTriListIn[], const SMikkTSpaceContext * pContext, const int iNrTrianglesIn, const int iTotTris);
+
+
+tbool genTangSpaceDefault(const SMikkTSpaceContext * pContext)
+{
+        return genTangSpace(pContext, 180.0f);
+}
+
+tbool genTangSpace(const SMikkTSpaceContext * pContext, const float fAngularThreshold)
+{
+        // count nr_triangles
+        int * piTriListIn = NULL, * piGroupTrianglesBuffer = NULL;
+        STriInfo * pTriInfos = NULL;
+        SGroup * pGroups = NULL;
+        STSpace * psTspace = NULL;
+        int iNrTrianglesIn = 0, f=0, t=0, i=0;
+        int iNrTSPaces = 0, iTotTris = 0, iDegenTriangles = 0, iNrMaxGroups = 0;
+        int iNrActiveGroups = 0, index = 0;
+        const int iNrFaces = pContext->m_pInterface->m_getNumFaces(pContext);
+        tbool bRes = TFALSE;
+        const float fThresCos = (float) cos((fAngularThreshold*(float)M_PI)/180.0f);
+
+        // verify all call-backs have been set
+        if ( pContext->m_pInterface->m_getNumFaces==NULL ||
+                pContext->m_pInterface->m_getNumVerticesOfFace==NULL ||
+                pContext->m_pInterface->m_getPosition==NULL ||
+                pContext->m_pInterface->m_getNormal==NULL ||
+                pContext->m_pInterface->m_getTexCoord==NULL )
+                return TFALSE;
+
+        // count triangles on supported faces
+        for (f=0; f<iNrFaces; f++)
+        {
+                const int verts = pContext->m_pInterface->m_getNumVerticesOfFace(pContext, f);
+                if (verts==3) ++iNrTrianglesIn;
+                else if (verts==4) iNrTrianglesIn += 2;
+        }
+        if (iNrTrianglesIn<=0) return TFALSE;
+
+        // allocate memory for an index list
+        piTriListIn = (int *) malloc(sizeof(int)*3*iNrTrianglesIn);
+        pTriInfos = (STriInfo *) malloc(sizeof(STriInfo)*iNrTrianglesIn);
+        if (piTriListIn==NULL || pTriInfos==NULL)
+        {
+                if (piTriListIn!=NULL) free(piTriListIn);
+                if (pTriInfos!=NULL) free(pTriInfos);
+                return TFALSE;
+        }
+
+        // make an initial triangle --> face index list
+        iNrTSPaces = GenerateInitialVerticesIndexList(pTriInfos, piTriListIn, pContext, iNrTrianglesIn);
+
+        // make a welded index list of identical positions and attributes (pos, norm, texc)
+        //printf("gen welded index list begin\n");
+        GenerateSharedVerticesIndexList(piTriListIn, pContext, iNrTrianglesIn);
+        //printf("gen welded index list end\n");
+
+        // Mark all degenerate triangles
+        iTotTris = iNrTrianglesIn;
+        iDegenTriangles = 0;
+        for (t=0; t<iTotTris; t++)
+        {
+                const int i0 = piTriListIn[t*3+0];
+                const int i1 = piTriListIn[t*3+1];
+                const int i2 = piTriListIn[t*3+2];
+                const SVec3 p0 = GetPosition(pContext, i0);
+                const SVec3 p1 = GetPosition(pContext, i1);
+                const SVec3 p2 = GetPosition(pContext, i2);
+                if (veq(p0,p1) || veq(p0,p2) || veq(p1,p2))     // degenerate
+                {
+                        pTriInfos[t].iFlag |= MARK_DEGENERATE;
+                        ++iDegenTriangles;
+                }
+        }
+        iNrTrianglesIn = iTotTris - iDegenTriangles;
+
+        // mark all triangle pairs that belong to a quad with only one
+        // good triangle. These need special treatment in DegenEpilogue().
+        // Additionally, move all good triangles to the start of
+        // pTriInfos[] and piTriListIn[] without changing order and
+        // put the degenerate triangles last.
+        DegenPrologue(pTriInfos, piTriListIn, iNrTrianglesIn, iTotTris);
+
+        
+        // evaluate triangle level attributes and neighbor list
+        //printf("gen neighbors list begin\n");
+        InitTriInfo(pTriInfos, piTriListIn, pContext, iNrTrianglesIn);
+        //printf("gen neighbors list end\n");
+
+        
+        // based on the 4 rules, identify groups based on connectivity
+        iNrMaxGroups = iNrTrianglesIn*3;
+        pGroups = (SGroup *) malloc(sizeof(SGroup)*iNrMaxGroups);
+        piGroupTrianglesBuffer = (int *) malloc(sizeof(int)*iNrTrianglesIn*3);
+        if (pGroups==NULL || piGroupTrianglesBuffer==NULL)
+        {
+                if (pGroups!=NULL) free(pGroups);
+                if (piGroupTrianglesBuffer!=NULL) free(piGroupTrianglesBuffer);
+                free(piTriListIn);
+                free(pTriInfos);
+                return TFALSE;
+        }
+        //printf("gen 4rule groups begin\n");
+        iNrActiveGroups =
+                Build4RuleGroups(pTriInfos, pGroups, piGroupTrianglesBuffer, piTriListIn, iNrTrianglesIn);
+        //printf("gen 4rule groups end\n");
+
+        //
+
+        psTspace = (STSpace *) malloc(sizeof(STSpace)*iNrTSPaces);
+        if (psTspace==NULL)
+        {
+                free(piTriListIn);
+                free(pTriInfos);
+                free(pGroups);
+                free(piGroupTrianglesBuffer);
+                return TFALSE;
+        }
+        memset(psTspace, 0, sizeof(STSpace)*iNrTSPaces);
+        for (t=0; t<iNrTSPaces; t++)
+        {
+                psTspace[t].vOs.x=1.0f; psTspace[t].vOs.y=0.0f; psTspace[t].vOs.z=0.0f; psTspace[t].fMagS = 1.0f;
+                psTspace[t].vOt.x=0.0f; psTspace[t].vOt.y=1.0f; psTspace[t].vOt.z=0.0f; psTspace[t].fMagT = 1.0f;
+        }
+
+        // make tspaces, each group is split up into subgroups if necessary
+        // based on fAngularThreshold. Finally a tangent space is made for
+        // every resulting subgroup
+        //printf("gen tspaces begin\n");
+        bRes = GenerateTSpaces(psTspace, pTriInfos, pGroups, iNrActiveGroups, piTriListIn, fThresCos, pContext);
+        //printf("gen tspaces end\n");
+        
+        // clean up
+        free(pGroups);
+        free(piGroupTrianglesBuffer);
+
+        if (!bRes)      // if an allocation in GenerateTSpaces() failed
+        {
+                // clean up and return false
+                free(pTriInfos); free(piTriListIn); free(psTspace);
+                return TFALSE;
+        }
+
+
+        // degenerate quads with one good triangle will be fixed by copying a space from
+        // the good triangle to the coinciding vertex.
+        // all other degenerate triangles will just copy a space from any good triangle
+        // with the same welded index in piTriListIn[].
+        DegenEpilogue(psTspace, pTriInfos, piTriListIn, pContext, iNrTrianglesIn, iTotTris);
+
+        free(pTriInfos); free(piTriListIn);
+
+        index = 0;
+        for (f=0; f<iNrFaces; f++)
+        {
+                const int verts = pContext->m_pInterface->m_getNumVerticesOfFace(pContext, f);
+                if (verts!=3 && verts!=4) continue;
+                
+
+                // I've decided to let degenerate triangles and group-with-anythings
+                // vary between left/right hand coordinate systems at the vertices.
+                // All healthy triangles on the other hand are built to always be either or.
+
+                /*// force the coordinate system orientation to be uniform for every face.
+                // (this is already the case for good triangles but not for
+                // degenerate ones and those with bGroupWithAnything==true)
+                bool bOrient = psTspace[index].bOrient;
+                if (psTspace[index].iCounter == 0)      // tspace was not derived from a group
+                {
+                        // look for a space created in GenerateTSpaces() by iCounter>0
+                        bool bNotFound = true;
+                        int i=1;
+                        while (i<verts && bNotFound)
+                        {
+                                if (psTspace[index+i].iCounter > 0) bNotFound=false;
+                                else ++i;
+                        }
+                        if (!bNotFound) bOrient = psTspace[index+i].bOrient;
+                }*/
+
+                // set data
+                for (i=0; i<verts; i++)
+                {
+                        const STSpace * pTSpace = &psTspace[index];
+                        float tang[] = {pTSpace->vOs.x, pTSpace->vOs.y, pTSpace->vOs.z};
+                        float bitang[] = {pTSpace->vOt.x, pTSpace->vOt.y, pTSpace->vOt.z};
+                        if (pContext->m_pInterface->m_setTSpace!=NULL)
+                                pContext->m_pInterface->m_setTSpace(pContext, tang, bitang, pTSpace->fMagS, pTSpace->fMagT, pTSpace->bOrient, f, i);
+                        if (pContext->m_pInterface->m_setTSpaceBasic!=NULL)
+                                pContext->m_pInterface->m_setTSpaceBasic(pContext, tang, pTSpace->bOrient==TTRUE ? 1.0f : (-1.0f), f, i);
+
+                        ++index;
+                }
+        }
+
+        free(psTspace);
+
+        
+        return TTRUE;
+}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+typedef struct {
+        float vert[3];
+        int index;
+} STmpVert;
+
+static const int g_iCells = 2048;
+
+#ifdef _MSC_VER
+#  define NOINLINE __declspec(noinline)
+#else
+#  define NOINLINE __attribute__ ((noinline))
+#endif
+
+// it is IMPORTANT that this function is called to evaluate the hash since
+// inlining could potentially reorder instructions and generate different
+// results for the same effective input value fVal.
+static NOINLINE int FindGridCell(const float fMin, const float fMax, const float fVal)
+{
+        const float fIndex = g_iCells * ((fVal-fMin)/(fMax-fMin));
+        const int iIndex = (int)fIndex;
+        return iIndex < g_iCells ? (iIndex >= 0 ? iIndex : 0) : (g_iCells - 1);
+}
+
+static void MergeVertsFast(int piTriList_in_and_out[], STmpVert pTmpVert[], const SMikkTSpaceContext * pContext, const int iL_in, const int iR_in);
+static void MergeVertsSlow(int piTriList_in_and_out[], const SMikkTSpaceContext * pContext, const int pTable[], const int iEntries);
+static void GenerateSharedVerticesIndexListSlow(int piTriList_in_and_out[], const SMikkTSpaceContext * pContext, const int iNrTrianglesIn);
+
+static void GenerateSharedVerticesIndexList(int piTriList_in_and_out[], const SMikkTSpaceContext * pContext, const int iNrTrianglesIn)
+{
+
+        // Generate bounding box
+        int * piHashTable=NULL, * piHashCount=NULL, * piHashOffsets=NULL, * piHashCount2=NULL;
+        STmpVert * pTmpVert = NULL;
+        int i=0, iChannel=0, k=0, e=0;
+        int iMaxCount=0;
+        SVec3 vMin = GetPosition(pContext, 0), vMax = vMin, vDim;
+        float fMin, fMax;
+        for (i=1; i<(iNrTrianglesIn*3); i++)
+        {
+                const int index = piTriList_in_and_out[i];
+
+                const SVec3 vP = GetPosition(pContext, index);
+                if (vMin.x > vP.x) vMin.x = vP.x;
+                else if (vMax.x < vP.x) vMax.x = vP.x;
+                if (vMin.y > vP.y) vMin.y = vP.y;
+                else if (vMax.y < vP.y) vMax.y = vP.y;
+                if (vMin.z > vP.z) vMin.z = vP.z;
+                else if (vMax.z < vP.z) vMax.z = vP.z;
+        }
+
+        vDim = vsub(vMax,vMin);
+        iChannel = 0;
+        fMin = vMin.x; fMax=vMax.x;
+        if (vDim.y>vDim.x && vDim.y>vDim.z)
+        {
+                iChannel=1;
+                fMin = vMin.y;
+                fMax = vMax.y;
+        }
+        else if (vDim.z>vDim.x)
+        {
+                iChannel=2;
+                fMin = vMin.z;
+                fMax = vMax.z;
+        }
+
+        // make allocations
+        piHashTable = (int *) malloc(sizeof(int)*iNrTrianglesIn*3);
+        piHashCount = (int *) malloc(sizeof(int)*g_iCells);
+        piHashOffsets = (int *) malloc(sizeof(int)*g_iCells);
+        piHashCount2 = (int *) malloc(sizeof(int)*g_iCells);
+
+        if (piHashTable==NULL || piHashCount==NULL || piHashOffsets==NULL || piHashCount2==NULL)
+        {
+                if (piHashTable!=NULL) free(piHashTable);
+                if (piHashCount!=NULL) free(piHashCount);
+                if (piHashOffsets!=NULL) free(piHashOffsets);
+                if (piHashCount2!=NULL) free(piHashCount2);
+                GenerateSharedVerticesIndexListSlow(piTriList_in_and_out, pContext, iNrTrianglesIn);
+                return;
+        }
+        memset(piHashCount, 0, sizeof(int)*g_iCells);
+        memset(piHashCount2, 0, sizeof(int)*g_iCells);
+
+        // count amount of elements in each cell unit
+        for (i=0; i<(iNrTrianglesIn*3); i++)
+        {
+                const int index = piTriList_in_and_out[i];
+                const SVec3 vP = GetPosition(pContext, index);
+                const float fVal = iChannel==0 ? vP.x : (iChannel==1 ? vP.y : vP.z);
+                const int iCell = FindGridCell(fMin, fMax, fVal);
+                ++piHashCount[iCell];
+        }
+
+        // evaluate start index of each cell.
+        piHashOffsets[0]=0;
+        for (k=1; k<g_iCells; k++)
+                piHashOffsets[k]=piHashOffsets[k-1]+piHashCount[k-1];
+
+        // insert vertices
+        for (i=0; i<(iNrTrianglesIn*3); i++)
+        {
+                const int index = piTriList_in_and_out[i];
+                const SVec3 vP = GetPosition(pContext, index);
+                const float fVal = iChannel==0 ? vP.x : (iChannel==1 ? vP.y : vP.z);
+                const int iCell = FindGridCell(fMin, fMax, fVal);
+                int * pTable = NULL;
+
+                assert(piHashCount2[iCell]<piHashCount[iCell]);
+                pTable = &piHashTable[piHashOffsets[iCell]];
+                pTable[piHashCount2[iCell]] = i;        // vertex i has been inserted.
+                ++piHashCount2[iCell];
+        }
+        for (k=0; k<g_iCells; k++)
+                assert(piHashCount2[k] == piHashCount[k]);      // verify the count
+        free(piHashCount2);
+
+        // find maximum amount of entries in any hash entry
+        iMaxCount = piHashCount[0];
+        for (k=1; k<g_iCells; k++)
+                if (iMaxCount<piHashCount[k])
+                        iMaxCount=piHashCount[k];
+        pTmpVert = (STmpVert *) malloc(sizeof(STmpVert)*iMaxCount);
+        
+
+        // complete the merge
+        for (k=0; k<g_iCells; k++)
+        {
+                // extract table of cell k and amount of entries in it
+                int * pTable = &piHashTable[piHashOffsets[k]];
+                const int iEntries = piHashCount[k];
+                if (iEntries < 2) continue;
+
+                if (pTmpVert!=NULL)
+                {
+                        for (e=0; e<iEntries; e++)
+                        {
+                                int i = pTable[e];
+                                const SVec3 vP = GetPosition(pContext, piTriList_in_and_out[i]);
+                                pTmpVert[e].vert[0] = vP.x; pTmpVert[e].vert[1] = vP.y;
+                                pTmpVert[e].vert[2] = vP.z; pTmpVert[e].index = i;
+                        }
+                        MergeVertsFast(piTriList_in_and_out, pTmpVert, pContext, 0, iEntries-1);
+                }
+                else
+                        MergeVertsSlow(piTriList_in_and_out, pContext, pTable, iEntries);
+        }
+
+        if (pTmpVert!=NULL) { free(pTmpVert); }
+        free(piHashTable);
+        free(piHashCount);
+        free(piHashOffsets);
+}
+
+static void MergeVertsFast(int piTriList_in_and_out[], STmpVert pTmpVert[], const SMikkTSpaceContext * pContext, const int iL_in, const int iR_in)
+{
+        // make bbox
+        int c=0, l=0, channel=0;
+        float fvMin[3], fvMax[3];
+        float dx=0, dy=0, dz=0, fSep=0;
+        for (c=0; c<3; c++)
+        {       fvMin[c]=pTmpVert[iL_in].vert[c]; fvMax[c]=fvMin[c];    }
+        for (l=(iL_in+1); l<=iR_in; l++) {
+                for (c=0; c<3; c++) {
+                        if (fvMin[c]>pTmpVert[l].vert[c]) fvMin[c]=pTmpVert[l].vert[c];
+                        if (fvMax[c]<pTmpVert[l].vert[c]) fvMax[c]=pTmpVert[l].vert[c];
+                }
+        }
+
+        dx = fvMax[0]-fvMin[0];
+        dy = fvMax[1]-fvMin[1];
+        dz = fvMax[2]-fvMin[2];
+
+        channel = 0;
+        if (dy>dx && dy>dz) channel=1;
+        else if (dz>dx) channel=2;
+
+        fSep = 0.5f*(fvMax[channel]+fvMin[channel]);
+
+        // stop if all vertices are NaNs
+        if (!isfinite(fSep))
+                return;
+
+        // terminate recursion when the separation/average value
+        // is no longer strictly between fMin and fMax values.
+        if (fSep>=fvMax[channel] || fSep<=fvMin[channel])
+        {
+                // complete the weld
+                for (l=iL_in; l<=iR_in; l++)
+                {
+                        int i = pTmpVert[l].index;
+                        const int index = piTriList_in_and_out[i];
+                        const SVec3 vP = GetPosition(pContext, index);
+                        const SVec3 vN = GetNormal(pContext, index);
+                        const SVec3 vT = GetTexCoord(pContext, index);
+
+                        tbool bNotFound = TTRUE;
+                        int l2=iL_in, i2rec=-1;
+                        while (l2<l && bNotFound)
+                        {
+                                const int i2 = pTmpVert[l2].index;
+                                const int index2 = piTriList_in_and_out[i2];
+                                const SVec3 vP2 = GetPosition(pContext, index2);
+                                const SVec3 vN2 = GetNormal(pContext, index2);
+                                const SVec3 vT2 = GetTexCoord(pContext, index2);
+                                i2rec=i2;
+
+                                //if (vP==vP2 && vN==vN2 && vT==vT2)
+                                if (vP.x==vP2.x && vP.y==vP2.y && vP.z==vP2.z &&
+                                        vN.x==vN2.x && vN.y==vN2.y && vN.z==vN2.z &&
+                                        vT.x==vT2.x && vT.y==vT2.y && vT.z==vT2.z)
+                                        bNotFound = TFALSE;
+                                else
+                                        ++l2;
+                        }
+                        
+                        // merge if previously found
+                        if (!bNotFound)
+                                piTriList_in_and_out[i] = piTriList_in_and_out[i2rec];
+                }
+        }
+        else
+        {
+                int iL=iL_in, iR=iR_in;
+                assert((iR_in-iL_in)>0);        // at least 2 entries
+
+                // separate (by fSep) all points between iL_in and iR_in in pTmpVert[]
+                while (iL < iR)
+                {
+                        tbool bReadyLeftSwap = TFALSE, bReadyRightSwap = TFALSE;
+                        while ((!bReadyLeftSwap) && iL<iR)
+                        {
+                                assert(iL>=iL_in && iL<=iR_in);
+                                bReadyLeftSwap = !(pTmpVert[iL].vert[channel]<fSep);
+                                if (!bReadyLeftSwap) ++iL;
+                        }
+                        while ((!bReadyRightSwap) && iL<iR)
+                        {
+                                assert(iR>=iL_in && iR<=iR_in);
+                                bReadyRightSwap = pTmpVert[iR].vert[channel]<fSep;
+                                if (!bReadyRightSwap) --iR;
+                        }
+                        assert( (iL<iR) || !(bReadyLeftSwap && bReadyRightSwap) );
+
+                        if (bReadyLeftSwap && bReadyRightSwap)
+                        {
+                                const STmpVert sTmp = pTmpVert[iL];
+                                assert(iL<iR);
+                                pTmpVert[iL] = pTmpVert[iR];
+                                pTmpVert[iR] = sTmp;
+                                ++iL; --iR;
+                        }
+                }
+
+                assert(iL==(iR+1) || (iL==iR));
+                if (iL==iR)
+                {
+                        const tbool bReadyRightSwap = pTmpVert[iR].vert[channel]<fSep;
+                        if (bReadyRightSwap) ++iL;
+                        else --iR;
+                }
+
+                // only need to weld when there is more than 1 instance of the (x,y,z)
+                if (iL_in < iR)
+                        MergeVertsFast(piTriList_in_and_out, pTmpVert, pContext, iL_in, iR);    // weld all left of fSep
+                if (iL < iR_in)
+                        MergeVertsFast(piTriList_in_and_out, pTmpVert, pContext, iL, iR_in);    // weld all right of (or equal to) fSep
+        }
+}
+
+static void MergeVertsSlow(int piTriList_in_and_out[], const SMikkTSpaceContext * pContext, const int pTable[], const int iEntries)
+{
+        // this can be optimized further using a tree structure or more hashing.
+        int e=0;
+        for (e=0; e<iEntries; e++)
+        {
+                int i = pTable[e];
+                const int index = piTriList_in_and_out[i];
+                const SVec3 vP = GetPosition(pContext, index);
+                const SVec3 vN = GetNormal(pContext, index);
+                const SVec3 vT = GetTexCoord(pContext, index);
+
+                tbool bNotFound = TTRUE;
+                int e2=0, i2rec=-1;
+                while (e2<e && bNotFound)
+                {
+                        const int i2 = pTable[e2];
+                        const int index2 = piTriList_in_and_out[i2];
+                        const SVec3 vP2 = GetPosition(pContext, index2);
+                        const SVec3 vN2 = GetNormal(pContext, index2);
+                        const SVec3 vT2 = GetTexCoord(pContext, index2);
+                        i2rec = i2;
+
+                        if (veq(vP,vP2) && veq(vN,vN2) && veq(vT,vT2))
+                                bNotFound = TFALSE;
+                        else
+                                ++e2;
+                }
+                
+                // merge if previously found
+                if (!bNotFound)
+                        piTriList_in_and_out[i] = piTriList_in_and_out[i2rec];
+        }
+}
+
+static void GenerateSharedVerticesIndexListSlow(int piTriList_in_and_out[], const SMikkTSpaceContext * pContext, const int iNrTrianglesIn)
+{
+        int iNumUniqueVerts = 0, t=0, i=0;
+        for (t=0; t<iNrTrianglesIn; t++)
+        {
+                for (i=0; i<3; i++)
+                {
+                        const int offs = t*3 + i;
+                        const int index = piTriList_in_and_out[offs];
+
+                        const SVec3 vP = GetPosition(pContext, index);
+                        const SVec3 vN = GetNormal(pContext, index);
+                        const SVec3 vT = GetTexCoord(pContext, index);
+
+                        tbool bFound = TFALSE;
+                        int t2=0, index2rec=-1;
+                        while (!bFound && t2<=t)
+                        {
+                                int j=0;
+                                while (!bFound && j<3)
+                                {
+                                        const int index2 = piTriList_in_and_out[t2*3 + j];
+                                        const SVec3 vP2 = GetPosition(pContext, index2);
+                                        const SVec3 vN2 = GetNormal(pContext, index2);
+                                        const SVec3 vT2 = GetTexCoord(pContext, index2);
+                                        
+                                        if (veq(vP,vP2) && veq(vN,vN2) && veq(vT,vT2))
+                                                bFound = TTRUE;
+                                        else
+                                                ++j;
+                                }
+                                if (!bFound) ++t2;
+                        }
+
+                        assert(bFound);
+                        // if we found our own
+                        if (index2rec == index) { ++iNumUniqueVerts; }
+
+                        piTriList_in_and_out[offs] = index2rec;
+                }
+        }
+}
+
+static int GenerateInitialVerticesIndexList(STriInfo pTriInfos[], int piTriList_out[], const SMikkTSpaceContext * pContext, const int iNrTrianglesIn)
+{
+        int iTSpacesOffs = 0, f=0, t=0;
+        int iDstTriIndex = 0;
+        for (f=0; f<pContext->m_pInterface->m_getNumFaces(pContext); f++)
+        {
+                const int verts = pContext->m_pInterface->m_getNumVerticesOfFace(pContext, f);
+                if (verts!=3 && verts!=4) continue;
+
+                pTriInfos[iDstTriIndex].iOrgFaceNumber = f;
+                pTriInfos[iDstTriIndex].iTSpacesOffs = iTSpacesOffs;
+
+                if (verts==3)
+                {
+                        unsigned char * pVerts = pTriInfos[iDstTriIndex].vert_num;
+                        pVerts[0]=0; pVerts[1]=1; pVerts[2]=2;
+                        piTriList_out[iDstTriIndex*3+0] = MakeIndex(f, 0);
+                        piTriList_out[iDstTriIndex*3+1] = MakeIndex(f, 1);
+                        piTriList_out[iDstTriIndex*3+2] = MakeIndex(f, 2);
+                        ++iDstTriIndex; // next
+                }
+                else
+                {
+                        {
+                                pTriInfos[iDstTriIndex+1].iOrgFaceNumber = f;
+                                pTriInfos[iDstTriIndex+1].iTSpacesOffs = iTSpacesOffs;
+                        }
+
+                        {
+                                // need an order independent way to evaluate
+                                // tspace on quads. This is done by splitting
+                                // along the shortest diagonal.
+                                const int i0 = MakeIndex(f, 0);
+                                const int i1 = MakeIndex(f, 1);
+                                const int i2 = MakeIndex(f, 2);
+                                const int i3 = MakeIndex(f, 3);
+                                const SVec3 T0 = GetTexCoord(pContext, i0);
+                                const SVec3 T1 = GetTexCoord(pContext, i1);
+                                const SVec3 T2 = GetTexCoord(pContext, i2);
+                                const SVec3 T3 = GetTexCoord(pContext, i3);
+                                const float distSQ_02 = LengthSquared(vsub(T2,T0));
+                                const float distSQ_13 = LengthSquared(vsub(T3,T1));
+                                tbool bQuadDiagIs_02;
+                                if (distSQ_02<distSQ_13)
+                                        bQuadDiagIs_02 = TTRUE;
+                                else if (distSQ_13<distSQ_02)
+                                        bQuadDiagIs_02 = TFALSE;
+                                else
+                                {
+                                        const SVec3 P0 = GetPosition(pContext, i0);
+                                        const SVec3 P1 = GetPosition(pContext, i1);
+                                        const SVec3 P2 = GetPosition(pContext, i2);
+                                        const SVec3 P3 = GetPosition(pContext, i3);
+                                        const float distSQ_02 = LengthSquared(vsub(P2,P0));
+                                        const float distSQ_13 = LengthSquared(vsub(P3,P1));
+
+                                        bQuadDiagIs_02 = distSQ_13<distSQ_02 ? TFALSE : TTRUE;
+                                }
+
+                                if (bQuadDiagIs_02)
+                                {
+                                        {
+                                                unsigned char * pVerts_A = pTriInfos[iDstTriIndex].vert_num;
+                                                pVerts_A[0]=0; pVerts_A[1]=1; pVerts_A[2]=2;
+                                        }
+                                        piTriList_out[iDstTriIndex*3+0] = i0;
+                                        piTriList_out[iDstTriIndex*3+1] = i1;
+                                        piTriList_out[iDstTriIndex*3+2] = i2;
+                                        ++iDstTriIndex; // next
+                                        {
+                                                unsigned char * pVerts_B = pTriInfos[iDstTriIndex].vert_num;
+                                                pVerts_B[0]=0; pVerts_B[1]=2; pVerts_B[2]=3;
+                                        }
+                                        piTriList_out[iDstTriIndex*3+0] = i0;
+                                        piTriList_out[iDstTriIndex*3+1] = i2;
+                                        piTriList_out[iDstTriIndex*3+2] = i3;
+                                        ++iDstTriIndex; // next
+                                }
+                                else
+                                {
+                                        {
+                                                unsigned char * pVerts_A = pTriInfos[iDstTriIndex].vert_num;
+                                                pVerts_A[0]=0; pVerts_A[1]=1; pVerts_A[2]=3;
+                                        }
+                                        piTriList_out[iDstTriIndex*3+0] = i0;
+                                        piTriList_out[iDstTriIndex*3+1] = i1;
+                                        piTriList_out[iDstTriIndex*3+2] = i3;
+                                        ++iDstTriIndex; // next
+                                        {
+                                                unsigned char * pVerts_B = pTriInfos[iDstTriIndex].vert_num;
+                                                pVerts_B[0]=1; pVerts_B[1]=2; pVerts_B[2]=3;
+                                        }
+                                        piTriList_out[iDstTriIndex*3+0] = i1;
+                                        piTriList_out[iDstTriIndex*3+1] = i2;
+                                        piTriList_out[iDstTriIndex*3+2] = i3;
+                                        ++iDstTriIndex; // next
+                                }
+                        }
+                }
+
+                iTSpacesOffs += verts;
+                assert(iDstTriIndex<=iNrTrianglesIn);
+        }
+
+        for (t=0; t<iNrTrianglesIn; t++)
+                pTriInfos[t].iFlag = 0;
+
+        // return total amount of tspaces
+        return iTSpacesOffs;
+}
+
+static SVec3 GetPosition(const SMikkTSpaceContext * pContext, const int index)
+{
+        int iF, iI;
+        SVec3 res; float pos[3];
+        IndexToData(&iF, &iI, index);
+        pContext->m_pInterface->m_getPosition(pContext, pos, iF, iI);
+        res.x=pos[0]; res.y=pos[1]; res.z=pos[2];
+        return res;
+}
+
+static SVec3 GetNormal(const SMikkTSpaceContext * pContext, const int index)
+{
+        int iF, iI;
+        SVec3 res; float norm[3];
+        IndexToData(&iF, &iI, index);
+        pContext->m_pInterface->m_getNormal(pContext, norm, iF, iI);
+        res.x=norm[0]; res.y=norm[1]; res.z=norm[2];
+        return res;
+}
+
+static SVec3 GetTexCoord(const SMikkTSpaceContext * pContext, const int index)
+{
+        int iF, iI;
+        SVec3 res; float texc[2];
+        IndexToData(&iF, &iI, index);
+        pContext->m_pInterface->m_getTexCoord(pContext, texc, iF, iI);
+        res.x=texc[0]; res.y=texc[1]; res.z=1.0f;
+        return res;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////////////////////////////////
+
+typedef union {
+        struct
+        {
+                int i0, i1, f;
+        };
+        int array[3];
+} SEdge;
+
+static void BuildNeighborsFast(STriInfo pTriInfos[], SEdge * pEdges, const int piTriListIn[], const int iNrTrianglesIn);
+static void BuildNeighborsSlow(STriInfo pTriInfos[], const int piTriListIn[], const int iNrTrianglesIn);
+
+// returns the texture area times 2
+static float CalcTexArea(const SMikkTSpaceContext * pContext, const int indices[])
+{
+        const SVec3 t1 = GetTexCoord(pContext, indices[0]);
+        const SVec3 t2 = GetTexCoord(pContext, indices[1]);
+        const SVec3 t3 = GetTexCoord(pContext, indices[2]);
+
+        const float t21x = t2.x-t1.x;
+        const float t21y = t2.y-t1.y;
+        const float t31x = t3.x-t1.x;
+        const float t31y = t3.y-t1.y;
+
+        const float fSignedAreaSTx2 = t21x*t31y - t21y*t31x;
+
+        return fSignedAreaSTx2<0 ? (-fSignedAreaSTx2) : fSignedAreaSTx2;
+}
+
+static void InitTriInfo(STriInfo pTriInfos[], const int piTriListIn[], const SMikkTSpaceContext * pContext, const int iNrTrianglesIn)
+{
+        int f=0, i=0, t=0;
+        // pTriInfos[f].iFlag is cleared in GenerateInitialVerticesIndexList() which is called before this function.
+
+        // generate neighbor info list
+        for (f=0; f<iNrTrianglesIn; f++)
+                for (i=0; i<3; i++)
+                {
+                        pTriInfos[f].FaceNeighbors[i] = -1;
+                        pTriInfos[f].AssignedGroup[i] = NULL;
+
+                        pTriInfos[f].vOs.x=0.0f; pTriInfos[f].vOs.y=0.0f; pTriInfos[f].vOs.z=0.0f;
+                        pTriInfos[f].vOt.x=0.0f; pTriInfos[f].vOt.y=0.0f; pTriInfos[f].vOt.z=0.0f;
+                        pTriInfos[f].fMagS = 0;
+                        pTriInfos[f].fMagT = 0;
+
+                        // assumed bad
+                        pTriInfos[f].iFlag |= GROUP_WITH_ANY;
+                }
+
+        // evaluate first order derivatives
+        for (f=0; f<iNrTrianglesIn; f++)
+        {
+                // initial values
+                const SVec3 v1 = GetPosition(pContext, piTriListIn[f*3+0]);
+                const SVec3 v2 = GetPosition(pContext, piTriListIn[f*3+1]);
+                const SVec3 v3 = GetPosition(pContext, piTriListIn[f*3+2]);
+                const SVec3 t1 = GetTexCoord(pContext, piTriListIn[f*3+0]);
+                const SVec3 t2 = GetTexCoord(pContext, piTriListIn[f*3+1]);
+                const SVec3 t3 = GetTexCoord(pContext, piTriListIn[f*3+2]);
+
+                const float t21x = t2.x-t1.x;
+                const float t21y = t2.y-t1.y;
+                const float t31x = t3.x-t1.x;
+                const float t31y = t3.y-t1.y;
+                const SVec3 d1 = vsub(v2,v1);
+                const SVec3 d2 = vsub(v3,v1);
+
+                const float fSignedAreaSTx2 = t21x*t31y - t21y*t31x;
+                //assert(fSignedAreaSTx2!=0);
+                SVec3 vOs = vsub(vscale(t31y,d1), vscale(t21y,d2));     // eq 18
+                SVec3 vOt = vadd(vscale(-t31x,d1), vscale(t21x,d2)); // eq 19
+
+                pTriInfos[f].iFlag |= (fSignedAreaSTx2>0 ? ORIENT_PRESERVING : 0);
+
+                if ( NotZero(fSignedAreaSTx2) )
+                {
+                        const float fAbsArea = fabsf(fSignedAreaSTx2);
+                        const float fLenOs = Length(vOs);
+                        const float fLenOt = Length(vOt);
+                        const float fS = (pTriInfos[f].iFlag&ORIENT_PRESERVING)==0 ? (-1.0f) : 1.0f;
+                        if ( NotZero(fLenOs) ) pTriInfos[f].vOs = vscale(fS/fLenOs, vOs);
+                        if ( NotZero(fLenOt) ) pTriInfos[f].vOt = vscale(fS/fLenOt, vOt);
+
+                        // evaluate magnitudes prior to normalization of vOs and vOt
+                        pTriInfos[f].fMagS = fLenOs / fAbsArea;
+                        pTriInfos[f].fMagT = fLenOt / fAbsArea;
+
+                        // if this is a good triangle
+                        if ( NotZero(pTriInfos[f].fMagS) && NotZero(pTriInfos[f].fMagT))
+                                pTriInfos[f].iFlag &= (~GROUP_WITH_ANY);
+                }
+        }
+
+        // force otherwise healthy quads to a fixed orientation
+        while (t<(iNrTrianglesIn-1))
+        {
+                const int iFO_a = pTriInfos[t].iOrgFaceNumber;
+                const int iFO_b = pTriInfos[t+1].iOrgFaceNumber;
+                if (iFO_a==iFO_b)       // this is a quad
+                {
+                        const tbool bIsDeg_a = (pTriInfos[t].iFlag&MARK_DEGENERATE)!=0 ? TTRUE : TFALSE;
+                        const tbool bIsDeg_b = (pTriInfos[t+1].iFlag&MARK_DEGENERATE)!=0 ? TTRUE : TFALSE;
+                        
+                        // bad triangles should already have been removed by
+                        // DegenPrologue(), but just in case check bIsDeg_a and bIsDeg_a are false
+                        if ((bIsDeg_a||bIsDeg_b)==TFALSE)
+                        {
+                                const tbool bOrientA = (pTriInfos[t].iFlag&ORIENT_PRESERVING)!=0 ? TTRUE : TFALSE;
+                                const tbool bOrientB = (pTriInfos[t+1].iFlag&ORIENT_PRESERVING)!=0 ? TTRUE : TFALSE;
+                                // if this happens the quad has extremely bad mapping!!
+                                if (bOrientA!=bOrientB)
+                                {
+                                        //printf("found quad with bad mapping\n");
+                                        tbool bChooseOrientFirstTri = TFALSE;
+                                        if ((pTriInfos[t+1].iFlag&GROUP_WITH_ANY)!=0) bChooseOrientFirstTri = TTRUE;
+                                        else if ( CalcTexArea(pContext, &piTriListIn[t*3+0]) >= CalcTexArea(pContext, &piTriListIn[(t+1)*3+0]) )
+                                                bChooseOrientFirstTri = TTRUE;
+
+                                        // force match
+                                        {
+                                                const int t0 = bChooseOrientFirstTri ? t : (t+1);
+                                                const int t1 = bChooseOrientFirstTri ? (t+1) : t;
+                                                pTriInfos[t1].iFlag &= (~ORIENT_PRESERVING);    // clear first
+                                                pTriInfos[t1].iFlag |= (pTriInfos[t0].iFlag&ORIENT_PRESERVING); // copy bit
+                                        }
+                                }
+                        }
+                        t += 2;
+                }
+                else
+                        ++t;
+        }
+        
+        // match up edge pairs
+        {
+                SEdge * pEdges = (SEdge *) malloc(sizeof(SEdge)*iNrTrianglesIn*3);
+                if (pEdges==NULL)
+                        BuildNeighborsSlow(pTriInfos, piTriListIn, iNrTrianglesIn);
+                else
+                {
+                        BuildNeighborsFast(pTriInfos, pEdges, piTriListIn, iNrTrianglesIn);
+        
+                        free(pEdges);
+                }
+        }
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////////////////////////////////
+
+static tbool AssignRecur(const int piTriListIn[], STriInfo psTriInfos[], const int iMyTriIndex, SGroup * pGroup);
+static void AddTriToGroup(SGroup * pGroup, const int iTriIndex);
+
+static int Build4RuleGroups(STriInfo pTriInfos[], SGroup pGroups[], int piGroupTrianglesBuffer[], const int piTriListIn[], const int iNrTrianglesIn)
+{
+        const int iNrMaxGroups = iNrTrianglesIn*3;
+        int iNrActiveGroups = 0;
+        int iOffset = 0, f=0, i=0;
+        (void)iNrMaxGroups;  /* quiet warnings in non debug mode */
+        for (f=0; f<iNrTrianglesIn; f++)
+        {
+                for (i=0; i<3; i++)
+                {
+                        // if not assigned to a group
+                        if ((pTriInfos[f].iFlag&GROUP_WITH_ANY)==0 && pTriInfos[f].AssignedGroup[i]==NULL)
+                        {
+                                tbool bOrPre;
+                                int neigh_indexL, neigh_indexR;
+                                const int vert_index = piTriListIn[f*3+i];
+                                assert(iNrActiveGroups<iNrMaxGroups);
+                                pTriInfos[f].AssignedGroup[i] = &pGroups[iNrActiveGroups];
+                                pTriInfos[f].AssignedGroup[i]->iVertexRepresentitive = vert_index;
+                                pTriInfos[f].AssignedGroup[i]->bOrientPreservering = (pTriInfos[f].iFlag&ORIENT_PRESERVING)!=0;
+                                pTriInfos[f].AssignedGroup[i]->iNrFaces = 0;
+                                pTriInfos[f].AssignedGroup[i]->pFaceIndices = &piGroupTrianglesBuffer[iOffset];
+                                ++iNrActiveGroups;
+
+                                AddTriToGroup(pTriInfos[f].AssignedGroup[i], f);
+                                bOrPre = (pTriInfos[f].iFlag&ORIENT_PRESERVING)!=0 ? TTRUE : TFALSE;
+                                neigh_indexL = pTriInfos[f].FaceNeighbors[i];
+                                neigh_indexR = pTriInfos[f].FaceNeighbors[i>0?(i-1):2];
+                                if (neigh_indexL>=0) // neighbor
+                                {
+                                        const tbool bAnswer =
+                                                AssignRecur(piTriListIn, pTriInfos, neigh_indexL,
+                                                                        pTriInfos[f].AssignedGroup[i] );
+                                        
+                                        const tbool bOrPre2 = (pTriInfos[neigh_indexL].iFlag&ORIENT_PRESERVING)!=0 ? TTRUE : TFALSE;
+                                        const tbool bDiff = bOrPre!=bOrPre2 ? TTRUE : TFALSE;
+                                        assert(bAnswer || bDiff);
+                                        (void)bAnswer, (void)bDiff;  /* quiet warnings in non debug mode */
+                                }
+                                if (neigh_indexR>=0) // neighbor
+                                {
+                                        const tbool bAnswer =
+                                                AssignRecur(piTriListIn, pTriInfos, neigh_indexR,
+                                                                        pTriInfos[f].AssignedGroup[i] );
+
+                                        const tbool bOrPre2 = (pTriInfos[neigh_indexR].iFlag&ORIENT_PRESERVING)!=0 ? TTRUE : TFALSE;
+                                        const tbool bDiff = bOrPre!=bOrPre2 ? TTRUE : TFALSE;
+                                        assert(bAnswer || bDiff);
+                                        (void)bAnswer, (void)bDiff;  /* quiet warnings in non debug mode */
+                                }
+
+                                // update offset
+                                iOffset += pTriInfos[f].AssignedGroup[i]->iNrFaces;
+                                // since the groups are disjoint a triangle can never
+                                // belong to more than 3 groups. Subsequently something
+                                // is completely screwed if this assertion ever hits.
+                                assert(iOffset <= iNrMaxGroups);
+                        }
+                }
+        }
+
+        return iNrActiveGroups;
+}
+
+static void AddTriToGroup(SGroup * pGroup, const int iTriIndex)
+{
+        pGroup->pFaceIndices[pGroup->iNrFaces] = iTriIndex;
+        ++pGroup->iNrFaces;
+}
+
+static tbool AssignRecur(const int piTriListIn[], STriInfo psTriInfos[],
+                                 const int iMyTriIndex, SGroup * pGroup)
+{
+        STriInfo * pMyTriInfo = &psTriInfos[iMyTriIndex];
+
+        // track down vertex
+        const int iVertRep = pGroup->iVertexRepresentitive;
+        const int * pVerts = &piTriListIn[3*iMyTriIndex+0];
+        int i=-1;
+        if (pVerts[0]==iVertRep) i=0;
+        else if (pVerts[1]==iVertRep) i=1;
+        else if (pVerts[2]==iVertRep) i=2;
+        assert(i>=0 && i<3);
+
+        // early out
+        if (pMyTriInfo->AssignedGroup[i] == pGroup) return TTRUE;
+        else if (pMyTriInfo->AssignedGroup[i]!=NULL) return TFALSE;
+        if ((pMyTriInfo->iFlag&GROUP_WITH_ANY)!=0)
+        {
+                // first to group with a group-with-anything triangle
+                // determines it's orientation.
+                // This is the only existing order dependency in the code!!
+                if ( pMyTriInfo->AssignedGroup[0] == NULL &&
+                        pMyTriInfo->AssignedGroup[1] == NULL &&
+                        pMyTriInfo->AssignedGroup[2] == NULL )
+                {
+                        pMyTriInfo->iFlag &= (~ORIENT_PRESERVING);
+                        pMyTriInfo->iFlag |= (pGroup->bOrientPreservering ? ORIENT_PRESERVING : 0);
+                }
+        }
+        {
+                const tbool bOrient = (pMyTriInfo->iFlag&ORIENT_PRESERVING)!=0 ? TTRUE : TFALSE;
+                if (bOrient != pGroup->bOrientPreservering) return TFALSE;
+        }
+
+        AddTriToGroup(pGroup, iMyTriIndex);
+        pMyTriInfo->AssignedGroup[i] = pGroup;
+
+        {
+                const int neigh_indexL = pMyTriInfo->FaceNeighbors[i];
+                const int neigh_indexR = pMyTriInfo->FaceNeighbors[i>0?(i-1):2];
+                if (neigh_indexL>=0)
+                        AssignRecur(piTriListIn, psTriInfos, neigh_indexL, pGroup);
+                if (neigh_indexR>=0)
+                        AssignRecur(piTriListIn, psTriInfos, neigh_indexR, pGroup);
+        }
+
+
+
+        return TTRUE;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////////////////////////////////
+
+static tbool CompareSubGroups(const SSubGroup * pg1, const SSubGroup * pg2);
+static void QuickSort(int* pSortBuffer, int iLeft, int iRight, unsigned int uSeed);
+static STSpace EvalTspace(int face_indices[], const int iFaces, const int piTriListIn[], const STriInfo pTriInfos[], const SMikkTSpaceContext * pContext, const int iVertexRepresentitive);
+
+static tbool GenerateTSpaces(STSpace psTspace[], const STriInfo pTriInfos[], const SGroup pGroups[],
+                             const int iNrActiveGroups, const int piTriListIn[], const float fThresCos,
+                             const SMikkTSpaceContext * pContext)
+{
+        STSpace * pSubGroupTspace = NULL;
+        SSubGroup * pUniSubGroups = NULL;
+        int * pTmpMembers = NULL;
+        int iMaxNrFaces=0, iUniqueTspaces=0, g=0, i=0;
+        for (g=0; g<iNrActiveGroups; g++)
+                if (iMaxNrFaces < pGroups[g].iNrFaces)
+                        iMaxNrFaces = pGroups[g].iNrFaces;
+
+        if (iMaxNrFaces == 0) return TTRUE;
+
+        // make initial allocations
+        pSubGroupTspace = (STSpace *) malloc(sizeof(STSpace)*iMaxNrFaces);
+        pUniSubGroups = (SSubGroup *) malloc(sizeof(SSubGroup)*iMaxNrFaces);
+        pTmpMembers = (int *) malloc(sizeof(int)*iMaxNrFaces);
+        if (pSubGroupTspace==NULL || pUniSubGroups==NULL || pTmpMembers==NULL)
+        {
+                if (pSubGroupTspace!=NULL) free(pSubGroupTspace);
+                if (pUniSubGroups!=NULL) free(pUniSubGroups);
+                if (pTmpMembers!=NULL) free(pTmpMembers);
+                return TFALSE;
+        }
+
+
+        iUniqueTspaces = 0;
+        for (g=0; g<iNrActiveGroups; g++)
+        {
+                const SGroup * pGroup = &pGroups[g];
+                int iUniqueSubGroups = 0, s=0;
+
+                for (i=0; i<pGroup->iNrFaces; i++)      // triangles
+                {
+                        const int f = pGroup->pFaceIndices[i];  // triangle number
+                        int index=-1, iVertIndex=-1, iOF_1=-1, iMembers=0, j=0, l=0;
+                        SSubGroup tmp_group;
+                        tbool bFound;
+                        SVec3 n, vOs, vOt;
+                        if (pTriInfos[f].AssignedGroup[0]==pGroup) index=0;
+                        else if (pTriInfos[f].AssignedGroup[1]==pGroup) index=1;
+                        else if (pTriInfos[f].AssignedGroup[2]==pGroup) index=2;
+                        assert(index>=0 && index<3);
+
+                        iVertIndex = piTriListIn[f*3+index];
+                        assert(iVertIndex==pGroup->iVertexRepresentitive);
+
+                        // is normalized already
+                        n = GetNormal(pContext, iVertIndex);
+                        
+                        // project
+                        vOs = vsub(pTriInfos[f].vOs, vscale(vdot(n,pTriInfos[f].vOs), n));
+                        vOt = vsub(pTriInfos[f].vOt, vscale(vdot(n,pTriInfos[f].vOt), n));
+                        if ( VNotZero(vOs) ) vOs = Normalize(vOs);
+                        if ( VNotZero(vOt) ) vOt = Normalize(vOt);
+
+                        // original face number
+                        iOF_1 = pTriInfos[f].iOrgFaceNumber;
+                        
+                        iMembers = 0;
+                        for (j=0; j<pGroup->iNrFaces; j++)
+                        {
+                                const int t = pGroup->pFaceIndices[j];  // triangle number
+                                const int iOF_2 = pTriInfos[t].iOrgFaceNumber;
+
+                                // project
+                                SVec3 vOs2 = vsub(pTriInfos[t].vOs, vscale(vdot(n,pTriInfos[t].vOs), n));
+                                SVec3 vOt2 = vsub(pTriInfos[t].vOt, vscale(vdot(n,pTriInfos[t].vOt), n));
+                                if ( VNotZero(vOs2) ) vOs2 = Normalize(vOs2);
+                                if ( VNotZero(vOt2) ) vOt2 = Normalize(vOt2);
+
+                                {
+                                        const tbool bAny = ( (pTriInfos[f].iFlag | pTriInfos[t].iFlag) & GROUP_WITH_ANY )!=0 ? TTRUE : TFALSE;
+                                        // make sure triangles which belong to the same quad are joined.
+                                        const tbool bSameOrgFace = iOF_1==iOF_2 ? TTRUE : TFALSE;
+
+                                        const float fCosS = vdot(vOs,vOs2);
+                                        const float fCosT = vdot(vOt,vOt2);
+
+                                        assert(f!=t || bSameOrgFace);   // sanity check
+                                        if (bAny || bSameOrgFace || (fCosS>fThresCos && fCosT>fThresCos))
+                                                pTmpMembers[iMembers++] = t;
+                                }
+                        }
+
+                        // sort pTmpMembers
+                        tmp_group.iNrFaces = iMembers;
+                        tmp_group.pTriMembers = pTmpMembers;
+                        if (iMembers>1)
+                        {
+                                unsigned int uSeed = INTERNAL_RND_SORT_SEED;    // could replace with a random seed?
+                                QuickSort(pTmpMembers, 0, iMembers-1, uSeed);
+                        }
+
+                        // look for an existing match
+                        bFound = TFALSE;
+                        l=0;
+                        while (l<iUniqueSubGroups && !bFound)
+                        {
+                                bFound = CompareSubGroups(&tmp_group, &pUniSubGroups[l]);
+                                if (!bFound) ++l;
+                        }
+                        
+                        // assign tangent space index
+                        assert(bFound || l==iUniqueSubGroups);
+                        //piTempTangIndices[f*3+index] = iUniqueTspaces+l;
+
+                        // if no match was found we allocate a new subgroup
+                        if (!bFound)
+                        {
+                                // insert new subgroup
+                                int * pIndices = (int *) malloc(sizeof(int)*iMembers);
+                                if (pIndices==NULL)
+                                {
+                                        // clean up and return false
+                                        int s=0;
+                                        for (s=0; s<iUniqueSubGroups; s++)
+                                                free(pUniSubGroups[s].pTriMembers);
+                                        free(pUniSubGroups);
+                                        free(pTmpMembers);
+                                        free(pSubGroupTspace);
+                                        return TFALSE;
+                                }
+                                pUniSubGroups[iUniqueSubGroups].iNrFaces = iMembers;
+                                pUniSubGroups[iUniqueSubGroups].pTriMembers = pIndices;
+                                memcpy(pIndices, tmp_group.pTriMembers, iMembers*sizeof(int));
+                                pSubGroupTspace[iUniqueSubGroups] =
+                                        EvalTspace(tmp_group.pTriMembers, iMembers, piTriListIn, pTriInfos, pContext, pGroup->iVertexRepresentitive);
+                                ++iUniqueSubGroups;
+                        }
+
+                        // output tspace
+                        {
+                                const int iOffs = pTriInfos[f].iTSpacesOffs;
+                                const int iVert = pTriInfos[f].vert_num[index];
+                                STSpace * pTS_out = &psTspace[iOffs+iVert];
+                                assert(pTS_out->iCounter<2);
+                                assert(((pTriInfos[f].iFlag&ORIENT_PRESERVING)!=0) == pGroup->bOrientPreservering);
+                                if (pTS_out->iCounter==1)
+                                {
+                                        *pTS_out = AvgTSpace(pTS_out, &pSubGroupTspace[l]);
+                                        pTS_out->iCounter = 2;  // update counter
+                                        pTS_out->bOrient = pGroup->bOrientPreservering;
+                                }
+                                else
+                                {
+                                        assert(pTS_out->iCounter==0);
+                                        *pTS_out = pSubGroupTspace[l];
+                                        pTS_out->iCounter = 1;  // update counter
+                                        pTS_out->bOrient = pGroup->bOrientPreservering;
+                                }
+                        }
+                }
+
+                // clean up and offset iUniqueTspaces
+                for (s=0; s<iUniqueSubGroups; s++)
+                        free(pUniSubGroups[s].pTriMembers);
+                iUniqueTspaces += iUniqueSubGroups;
+        }
+
+        // clean up
+        free(pUniSubGroups);
+        free(pTmpMembers);
+        free(pSubGroupTspace);
+
+        return TTRUE;
+}
+
+static STSpace EvalTspace(int face_indices[], const int iFaces, const int piTriListIn[], const STriInfo pTriInfos[],
+                          const SMikkTSpaceContext * pContext, const int iVertexRepresentitive)
+{
+        STSpace res;
+        float fAngleSum = 0;
+        int face=0;
+        res.vOs.x=0.0f; res.vOs.y=0.0f; res.vOs.z=0.0f;
+        res.vOt.x=0.0f; res.vOt.y=0.0f; res.vOt.z=0.0f;
+        res.fMagS = 0; res.fMagT = 0;
+
+        for (face=0; face<iFaces; face++)
+        {
+                const int f = face_indices[face];
+
+                // only valid triangles get to add their contribution
+                if ( (pTriInfos[f].iFlag&GROUP_WITH_ANY)==0 )
+                {
+                        SVec3 n, vOs, vOt, p0, p1, p2, v1, v2;
+                        float fCos, fAngle, fMagS, fMagT;
+                        int i=-1, index=-1, i0=-1, i1=-1, i2=-1;
+                        if (piTriListIn[3*f+0]==iVertexRepresentitive) i=0;
+                        else if (piTriListIn[3*f+1]==iVertexRepresentitive) i=1;
+                        else if (piTriListIn[3*f+2]==iVertexRepresentitive) i=2;
+                        assert(i>=0 && i<3);
+
+                        // project
+                        index = piTriListIn[3*f+i];
+                        n = GetNormal(pContext, index);
+                        vOs = vsub(pTriInfos[f].vOs, vscale(vdot(n,pTriInfos[f].vOs), n));
+                        vOt = vsub(pTriInfos[f].vOt, vscale(vdot(n,pTriInfos[f].vOt), n));
+                        if ( VNotZero(vOs) ) vOs = Normalize(vOs);
+                        if ( VNotZero(vOt) ) vOt = Normalize(vOt);
+
+                        i2 = piTriListIn[3*f + (i<2?(i+1):0)];
+                        i1 = piTriListIn[3*f + i];
+                        i0 = piTriListIn[3*f + (i>0?(i-1):2)];
+
+                        p0 = GetPosition(pContext, i0);
+                        p1 = GetPosition(pContext, i1);
+                        p2 = GetPosition(pContext, i2);
+                        v1 = vsub(p0,p1);
+                        v2 = vsub(p2,p1);
+
+                        // project
+                        v1 = vsub(v1, vscale(vdot(n,v1),n)); if ( VNotZero(v1) ) v1 = Normalize(v1);
+                        v2 = vsub(v2, vscale(vdot(n,v2),n)); if ( VNotZero(v2) ) v2 = Normalize(v2);
+
+                        // weight contribution by the angle
+                        // between the two edge vectors
+                        fCos = vdot(v1,v2); fCos=fCos>1?1:(fCos<(-1) ? (-1) : fCos);
+                        fAngle = (float) acos(fCos);
+                        fMagS = pTriInfos[f].fMagS;
+                        fMagT = pTriInfos[f].fMagT;
+
+                        res.vOs=vadd(res.vOs, vscale(fAngle,vOs));
+                        res.vOt=vadd(res.vOt,vscale(fAngle,vOt));
+                        res.fMagS+=(fAngle*fMagS);
+                        res.fMagT+=(fAngle*fMagT);
+                        fAngleSum += fAngle;
+                }
+        }
+
+        // normalize
+        if ( VNotZero(res.vOs) ) res.vOs = Normalize(res.vOs);
+        if ( VNotZero(res.vOt) ) res.vOt = Normalize(res.vOt);
+        if (fAngleSum>0)
+        {
+                res.fMagS /= fAngleSum;
+                res.fMagT /= fAngleSum;
+        }
+
+        return res;
+}
+
+static tbool CompareSubGroups(const SSubGroup * pg1, const SSubGroup * pg2)
+{
+        tbool bStillSame=TTRUE;
+        int i=0;
+        if (pg1->iNrFaces!=pg2->iNrFaces) return TFALSE;
+        while (i<pg1->iNrFaces && bStillSame)
+        {
+                bStillSame = pg1->pTriMembers[i]==pg2->pTriMembers[i] ? TTRUE : TFALSE;
+                if (bStillSame) ++i;
+        }
+        return bStillSame;
+}
+
+static void QuickSort(int* pSortBuffer, int iLeft, int iRight, unsigned int uSeed)
+{
+        int iL, iR, n, index, iMid, iTmp;
+
+        // Random
+        unsigned int t=uSeed&31;
+        t=(uSeed<<t)|(uSeed>>(32-t));
+        uSeed=uSeed+t+3;
+        // Random end
+
+        iL=iLeft; iR=iRight;
+        n = (iR-iL)+1;
+        assert(n>=0);
+        index = (int) (uSeed%n);
+
+        iMid=pSortBuffer[index + iL];
+
+
+        do
+        {
+                while (pSortBuffer[iL] < iMid)
+                        ++iL;
+                while (pSortBuffer[iR] > iMid)
+                        --iR;
+
+                if (iL <= iR)
+                {
+                        iTmp = pSortBuffer[iL];
+                        pSortBuffer[iL] = pSortBuffer[iR];
+                        pSortBuffer[iR] = iTmp;
+                        ++iL; --iR;
+                }
+        }
+        while (iL <= iR);
+
+        if (iLeft < iR)
+                QuickSort(pSortBuffer, iLeft, iR, uSeed);
+        if (iL < iRight)
+                QuickSort(pSortBuffer, iL, iRight, uSeed);
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////////////////////////
+
+static void QuickSortEdges(SEdge * pSortBuffer, int iLeft, int iRight, const int channel, unsigned int uSeed);
+static void GetEdge(int * i0_out, int * i1_out, int * edgenum_out, const int indices[], const int i0_in, const int i1_in);
+
+static void BuildNeighborsFast(STriInfo pTriInfos[], SEdge * pEdges, const int piTriListIn[], const int iNrTrianglesIn)
+{
+        // build array of edges
+        unsigned int uSeed = INTERNAL_RND_SORT_SEED;                            // could replace with a random seed?
+        int iEntries=0, iCurStartIndex=-1, f=0, i=0;
+        for (f=0; f<iNrTrianglesIn; f++)
+                for (i=0; i<3; i++)
+                {
+                        const int i0 = piTriListIn[f*3+i];
+                        const int i1 = piTriListIn[f*3+(i<2?(i+1):0)];
+                        pEdges[f*3+i].i0 = i0 < i1 ? i0 : i1;                   // put minimum index in i0
+                        pEdges[f*3+i].i1 = !(i0 < i1) ? i0 : i1;                // put maximum index in i1
+                        pEdges[f*3+i].f = f;                                                    // record face number
+                }
+
+        // sort over all edges by i0, this is the pricy one.
+        QuickSortEdges(pEdges, 0, iNrTrianglesIn*3-1, 0, uSeed);        // sort channel 0 which is i0
+
+        // sub sort over i1, should be fast.
+        // could replace this with a 64 bit int sort over (i0,i1)
+        // with i0 as msb in the quicksort call above.
+        iEntries = iNrTrianglesIn*3;
+        iCurStartIndex = 0;
+        for (i=1; i<iEntries; i++)
+        {
+                if (pEdges[iCurStartIndex].i0 != pEdges[i].i0)
+                {
+                        const int iL = iCurStartIndex;
+                        const int iR = i-1;
+                        //const int iElems = i-iL;
+                        iCurStartIndex = i;
+                        QuickSortEdges(pEdges, iL, iR, 1, uSeed);       // sort channel 1 which is i1
+                }
+        }
+
+        // sub sort over f, which should be fast.
+        // this step is to remain compliant with BuildNeighborsSlow() when
+        // more than 2 triangles use the same edge (such as a butterfly topology).
+        iCurStartIndex = 0;
+        for (i=1; i<iEntries; i++)
+        {
+                if (pEdges[iCurStartIndex].i0 != pEdges[i].i0 || pEdges[iCurStartIndex].i1 != pEdges[i].i1)
+                {
+                        const int iL = iCurStartIndex;
+                        const int iR = i-1;
+                        //const int iElems = i-iL;
+                        iCurStartIndex = i;
+                        QuickSortEdges(pEdges, iL, iR, 2, uSeed);       // sort channel 2 which is f
+                }
+        }
+
+        // pair up, adjacent triangles
+        for (i=0; i<iEntries; i++)
+        {
+                const int i0=pEdges[i].i0;
+                const int i1=pEdges[i].i1;
+                const int f = pEdges[i].f;
+                tbool bUnassigned_A;
+
+                int i0_A, i1_A;
+                int edgenum_A, edgenum_B=0;     // 0,1 or 2
+                GetEdge(&i0_A, &i1_A, &edgenum_A, &piTriListIn[f*3], i0, i1);   // resolve index ordering and edge_num
+                bUnassigned_A = pTriInfos[f].FaceNeighbors[edgenum_A] == -1 ? TTRUE : TFALSE;
+
+                if (bUnassigned_A)
+                {
+                        // get true index ordering
+                        int j=i+1, t;
+                        tbool bNotFound = TTRUE;
+                        while (j<iEntries && i0==pEdges[j].i0 && i1==pEdges[j].i1 && bNotFound)
+                        {
+                                tbool bUnassigned_B;
+                                int i0_B, i1_B;
+                                t = pEdges[j].f;
+                                // flip i0_B and i1_B
+                                GetEdge(&i1_B, &i0_B, &edgenum_B, &piTriListIn[t*3], pEdges[j].i0, pEdges[j].i1);       // resolve index ordering and edge_num
+                                //assert(!(i0_A==i1_B && i1_A==i0_B));
+                                bUnassigned_B =  pTriInfos[t].FaceNeighbors[edgenum_B]==-1 ? TTRUE : TFALSE;
+                                if (i0_A==i0_B && i1_A==i1_B && bUnassigned_B)
+                                        bNotFound = TFALSE;
+                                else
+                                        ++j;
+                        }
+
+                        if (!bNotFound)
+                        {
+                                int t = pEdges[j].f;
+                                pTriInfos[f].FaceNeighbors[edgenum_A] = t;
+                                //assert(pTriInfos[t].FaceNeighbors[edgenum_B]==-1);
+                                pTriInfos[t].FaceNeighbors[edgenum_B] = f;
+                        }
+                }
+        }
+}
+
+static void BuildNeighborsSlow(STriInfo pTriInfos[], const int piTriListIn[], const int iNrTrianglesIn)
+{
+        int f=0, i=0;
+        for (f=0; f<iNrTrianglesIn; f++)
+        {
+                for (i=0; i<3; i++)
+                {
+                        // if unassigned
+                        if (pTriInfos[f].FaceNeighbors[i] == -1)
+                        {
+                                const int i0_A = piTriListIn[f*3+i];
+                                const int i1_A = piTriListIn[f*3+(i<2?(i+1):0)];
+
+                                // search for a neighbor
+                                tbool bFound = TFALSE;
+                                int t=0, j=0;
+                                while (!bFound && t<iNrTrianglesIn)
+                                {
+                                        if (t!=f)
+                                        {
+                                                j=0;
+                                                while (!bFound && j<3)
+                                                {
+                                                        // in rev order
+                                                        const int i1_B = piTriListIn[t*3+j];
+                                                        const int i0_B = piTriListIn[t*3+(j<2?(j+1):0)];
+                                                        //assert(!(i0_A==i1_B && i1_A==i0_B));
+                                                        if (i0_A==i0_B && i1_A==i1_B)
+                                                                bFound = TTRUE;
+                                                        else
+                                                                ++j;
+                                                }
+                                        }
+                                        
+                                        if (!bFound) ++t;
+                                }
+
+                                // assign neighbors
+                                if (bFound)
+                                {
+                                        pTriInfos[f].FaceNeighbors[i] = t;
+                                        //assert(pTriInfos[t].FaceNeighbors[j]==-1);
+                                        pTriInfos[t].FaceNeighbors[j] = f;
+                                }
+                        }
+                }
+        }
+}
+
+static void QuickSortEdges(SEdge * pSortBuffer, int iLeft, int iRight, const int channel, unsigned int uSeed)
+{
+        unsigned int t;
+        int iL, iR, n, index, iMid;
+
+        // early out
+        SEdge sTmp;
+        const int iElems = iRight-iLeft+1;
+        if (iElems<2) return;
+        else if (iElems==2)
+        {
+                if (pSortBuffer[iLeft].array[channel] > pSortBuffer[iRight].array[channel])
+                {
+                        sTmp = pSortBuffer[iLeft];
+                        pSortBuffer[iLeft] = pSortBuffer[iRight];
+                        pSortBuffer[iRight] = sTmp;
+                }
+                return;
+        }
+
+        // Random
+        t=uSeed&31;
+        t=(uSeed<<t)|(uSeed>>(32-t));
+        uSeed=uSeed+t+3;
+        // Random end
+
+        iL = iLeft;
+        iR = iRight;
+        n = (iR-iL)+1;
+        assert(n>=0);
+        index = (int) (uSeed%n);
+
+        iMid=pSortBuffer[index + iL].array[channel];
+
+        do
+        {
+                while (pSortBuffer[iL].array[channel] < iMid)
+                        ++iL;
+                while (pSortBuffer[iR].array[channel] > iMid)
+                        --iR;
+
+                if (iL <= iR)
+                {
+                        sTmp = pSortBuffer[iL];
+                        pSortBuffer[iL] = pSortBuffer[iR];
+                        pSortBuffer[iR] = sTmp;
+                        ++iL; --iR;
+                }
+        }
+        while (iL <= iR);
+
+        if (iLeft < iR)
+                QuickSortEdges(pSortBuffer, iLeft, iR, channel, uSeed);
+        if (iL < iRight)
+                QuickSortEdges(pSortBuffer, iL, iRight, channel, uSeed);
+}
+
+// resolve ordering and edge number
+static void GetEdge(int * i0_out, int * i1_out, int * edgenum_out, const int indices[], const int i0_in, const int i1_in)
+{
+        *edgenum_out = -1;
+        
+        // test if first index is on the edge
+        if (indices[0]==i0_in || indices[0]==i1_in)
+        {
+                // test if second index is on the edge
+                if (indices[1]==i0_in || indices[1]==i1_in)
+                {
+                        edgenum_out[0]=0;       // first edge
+                        i0_out[0]=indices[0];
+                        i1_out[0]=indices[1];
+                }
+                else
+                {
+                        edgenum_out[0]=2;       // third edge
+                        i0_out[0]=indices[2];
+                        i1_out[0]=indices[0];
+                }
+        }
+        else
+        {
+                // only second and third index is on the edge
+                edgenum_out[0]=1;       // second edge
+                i0_out[0]=indices[1];
+                i1_out[0]=indices[2];
+        }
+}
+
+
+/////////////////////////////////////////////////////////////////////////////////////////////
+/////////////////////////////////// Degenerate triangles ////////////////////////////////////
+
+static void DegenPrologue(STriInfo pTriInfos[], int piTriList_out[], const int iNrTrianglesIn, const int iTotTris)
+{
+        int iNextGoodTriangleSearchIndex=-1;
+        tbool bStillFindingGoodOnes;
+
+        // locate quads with only one good triangle
+        int t=0;
+        while (t<(iTotTris-1))
+        {
+                const int iFO_a = pTriInfos[t].iOrgFaceNumber;
+                const int iFO_b = pTriInfos[t+1].iOrgFaceNumber;
+                if (iFO_a==iFO_b)       // this is a quad
+                {
+                        const tbool bIsDeg_a = (pTriInfos[t].iFlag&MARK_DEGENERATE)!=0 ? TTRUE : TFALSE;
+                        const tbool bIsDeg_b = (pTriInfos[t+1].iFlag&MARK_DEGENERATE)!=0 ? TTRUE : TFALSE;
+                        if ((bIsDeg_a^bIsDeg_b)!=0)
+                        {
+                                pTriInfos[t].iFlag |= QUAD_ONE_DEGEN_TRI;
+                                pTriInfos[t+1].iFlag |= QUAD_ONE_DEGEN_TRI;
+                        }
+                        t += 2;
+                }
+                else
+                        ++t;
+        }
+
+        // reorder list so all degen triangles are moved to the back
+        // without reordering the good triangles
+        iNextGoodTriangleSearchIndex = 1;
+        t=0;
+        bStillFindingGoodOnes = TTRUE;
+        while (t<iNrTrianglesIn && bStillFindingGoodOnes)
+        {
+                const tbool bIsGood = (pTriInfos[t].iFlag&MARK_DEGENERATE)==0 ? TTRUE : TFALSE;
+                if (bIsGood)
+                {
+                        if (iNextGoodTriangleSearchIndex < (t+2))
+                                iNextGoodTriangleSearchIndex = t+2;
+                }
+                else
+                {
+                        int t0, t1;
+                        // search for the first good triangle.
+                        tbool bJustADegenerate = TTRUE;
+                        while (bJustADegenerate && iNextGoodTriangleSearchIndex<iTotTris)
+                        {
+                                const tbool bIsGood = (pTriInfos[iNextGoodTriangleSearchIndex].iFlag&MARK_DEGENERATE)==0 ? TTRUE : TFALSE;
+                                if (bIsGood) bJustADegenerate=TFALSE;
+                                else ++iNextGoodTriangleSearchIndex;
+                        }
+
+                        t0 = t;
+                        t1 = iNextGoodTriangleSearchIndex;
+                        ++iNextGoodTriangleSearchIndex;
+                        assert(iNextGoodTriangleSearchIndex > (t+1));
+
+                        // swap triangle t0 and t1
+                        if (!bJustADegenerate)
+                        {
+                                int i=0;
+                                for (i=0; i<3; i++)
+                                {
+                                        const int index = piTriList_out[t0*3+i];
+                                        piTriList_out[t0*3+i] = piTriList_out[t1*3+i];
+                                        piTriList_out[t1*3+i] = index;
+                                }
+                                {
+                                        const STriInfo tri_info = pTriInfos[t0];
+                                        pTriInfos[t0] = pTriInfos[t1];
+                                        pTriInfos[t1] = tri_info;
+                                }
+                        }
+                        else
+                                bStillFindingGoodOnes = TFALSE; // this is not supposed to happen
+                }
+
+                if (bStillFindingGoodOnes) ++t;
+        }
+
+        assert(bStillFindingGoodOnes);  // code will still work.
+        assert(iNrTrianglesIn == t);
+}
+
+static void DegenEpilogue(STSpace psTspace[], STriInfo pTriInfos[], int piTriListIn[], const SMikkTSpaceContext * pContext, const int iNrTrianglesIn, const int iTotTris)
+{
+        int t=0, i=0;
+        // deal with degenerate triangles
+        // punishment for degenerate triangles is O(N^2)
+        for (t=iNrTrianglesIn; t<iTotTris; t++)
+        {
+                // degenerate triangles on a quad with one good triangle are skipped
+                // here but processed in the next loop
+                const tbool bSkip = (pTriInfos[t].iFlag&QUAD_ONE_DEGEN_TRI)!=0 ? TTRUE : TFALSE;
+
+                if (!bSkip)
+                {
+                        for (i=0; i<3; i++)
+                        {
+                                const int index1 = piTriListIn[t*3+i];
+                                // search through the good triangles
+                                tbool bNotFound = TTRUE;
+                                int j=0;
+                                while (bNotFound && j<(3*iNrTrianglesIn))
+                                {
+                                        const int index2 = piTriListIn[j];
+                                        if (index1==index2) bNotFound=TFALSE;
+                                        else ++j;
+                                }
+
+                                if (!bNotFound)
+                                {
+                                        const int iTri = j/3;
+                                        const int iVert = j%3;
+                                        const int iSrcVert=pTriInfos[iTri].vert_num[iVert];
+                                        const int iSrcOffs=pTriInfos[iTri].iTSpacesOffs;
+                                        const int iDstVert=pTriInfos[t].vert_num[i];
+                                        const int iDstOffs=pTriInfos[t].iTSpacesOffs;
+                                        
+                                        // copy tspace
+                                        psTspace[iDstOffs+iDstVert] = psTspace[iSrcOffs+iSrcVert];
+                                }
+                        }
+                }
+        }
+
+        // deal with degenerate quads with one good triangle
+        for (t=0; t<iNrTrianglesIn; t++)
+        {
+                // this triangle belongs to a quad where the
+                // other triangle is degenerate
+                if ( (pTriInfos[t].iFlag&QUAD_ONE_DEGEN_TRI)!=0 )
+                {
+                        SVec3 vDstP;
+                        int iOrgF=-1, i=0;
+                        tbool bNotFound;
+                        unsigned char * pV = pTriInfos[t].vert_num;
+                        int iFlag = (1<<pV[0]) | (1<<pV[1]) | (1<<pV[2]);
+                        int iMissingIndex = 0;
+                        if ((iFlag&2)==0) iMissingIndex=1;
+                        else if ((iFlag&4)==0) iMissingIndex=2;
+                        else if ((iFlag&8)==0) iMissingIndex=3;
+
+                        iOrgF = pTriInfos[t].iOrgFaceNumber;
+                        vDstP = GetPosition(pContext, MakeIndex(iOrgF, iMissingIndex));
+                        bNotFound = TTRUE;
+                        i=0;
+                        while (bNotFound && i<3)
+                        {
+                                const int iVert = pV[i];
+                                const SVec3 vSrcP = GetPosition(pContext, MakeIndex(iOrgF, iVert));
+                                if (veq(vSrcP, vDstP)==TTRUE)
+                                {
+                                        const int iOffs = pTriInfos[t].iTSpacesOffs;
+                                        psTspace[iOffs+iMissingIndex] = psTspace[iOffs+iVert];
+                                        bNotFound=TFALSE;
+                                }
+                                else
+                                        ++i;
+                        }
+                        assert(!bNotFound);
+                }
+        }
+}
diff --git a/contrib/cgltf-tangents/MikkTSpace/mikktspace.h b/contrib/cgltf-tangents/MikkTSpace/mikktspace.h
new file mode 100644
index 0000000..52c44a7
--- /dev/null
+++ b/contrib/cgltf-tangents/MikkTSpace/mikktspace.h
@@ -0,0 +1,145 @@
+/** \file mikktspace/mikktspace.h
+ *  \ingroup mikktspace
+ */
+/**
+ *  Copyright (C) 2011 by Morten S. Mikkelsen
+ *
+ *  This software is provided 'as-is', without any express or implied
+ *  warranty.  In no event will the authors be held liable for any damages
+ *  arising from the use of this software.
+ *
+ *  Permission is granted to anyone to use this software for any purpose,
+ *  including commercial applications, and to alter it and redistribute it
+ *  freely, subject to the following restrictions:
+ *
+ *  1. The origin of this software must not be misrepresented; you must not
+ *     claim that you wrote the original software. If you use this software
+ *     in a product, an acknowledgment in the product documentation would be
+ *     appreciated but is not required.
+ *  2. Altered source versions must be plainly marked as such, and must not be
+ *     misrepresented as being the original software.
+ *  3. This notice may not be removed or altered from any source distribution.
+ */
+
+#ifndef __MIKKTSPACE_H__
+#define __MIKKTSPACE_H__
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Author: Morten S. Mikkelsen
+ * Version: 1.0
+ *
+ * The files mikktspace.h and mikktspace.c are designed to be
+ * stand-alone files and it is important that they are kept this way.
+ * Not having dependencies on structures/classes/libraries specific
+ * to the program, in which they are used, allows them to be copied
+ * and used as is into any tool, program or plugin.
+ * The code is designed to consistently generate the same
+ * tangent spaces, for a given mesh, in any tool in which it is used.
+ * This is done by performing an internal welding step and subsequently an order-independent evaluation
+ * of tangent space for meshes consisting of triangles and quads.
+ * This means faces can be received in any order and the same is true for
+ * the order of vertices of each face. The generated result will not be affected
+ * by such reordering. Additionally, whether degenerate (vertices or texture coordinates)
+ * primitives are present or not will not affect the generated results either.
+ * Once tangent space calculation is done the vertices of degenerate primitives will simply
+ * inherit tangent space from neighboring non degenerate primitives.
+ * The analysis behind this implementation can be found in my master's thesis
+ * which is available for download --> http://image.diku.dk/projects/media/morten.mikkelsen.08.pdf
+ * Note that though the tangent spaces at the vertices are generated in an order-independent way,
+ * by this implementation, the interpolated tangent space is still affected by which diagonal is
+ * chosen to split each quad. A sensible solution is to have your tools pipeline always
+ * split quads by the shortest diagonal. This choice is order-independent and works with mirroring.
+ * If these have the same length then compare the diagonals defined by the texture coordinates.
+ * XNormal which is a tool for baking normal maps allows you to write your own tangent space plugin
+ * and also quad triangulator plugin.
+ */
+
+
+typedef int tbool;
+typedef struct SMikkTSpaceContext SMikkTSpaceContext;
+
+typedef struct {
+        // Returns the number of faces (triangles/quads) on the mesh to be processed.
+        int (*m_getNumFaces)(const SMikkTSpaceContext * pContext);
+
+        // Returns the number of vertices on face number iFace
+        // iFace is a number in the range {0, 1, ..., getNumFaces()-1}
+        int (*m_getNumVerticesOfFace)(const SMikkTSpaceContext * pContext, const int iFace);
+
+        // returns the position/normal/texcoord of the referenced face of vertex number iVert.
+        // iVert is in the range {0,1,2} for triangles and {0,1,2,3} for quads.
+        void (*m_getPosition)(const SMikkTSpaceContext * pContext, float fvPosOut[], const int iFace, const int iVert);
+        void (*m_getNormal)(const SMikkTSpaceContext * pContext, float fvNormOut[], const int iFace, const int iVert);
+        void (*m_getTexCoord)(const SMikkTSpaceContext * pContext, float fvTexcOut[], const int iFace, const int iVert);
+
+        // either (or both) of the two setTSpace callbacks can be set.
+        // The call-back m_setTSpaceBasic() is sufficient for basic normal mapping.
+
+        // This function is used to return the tangent and fSign to the application.
+        // fvTangent is a unit length vector.
+        // For normal maps it is sufficient to use the following simplified version of the bitangent which is generated at pixel/vertex level.
+        // bitangent = fSign * cross(vN, tangent);
+        // Note that the results are returned unindexed. It is possible to generate a new index list
+        // But averaging/overwriting tangent spaces by using an already existing index list WILL produce INCRORRECT results.
+        // DO NOT! use an already existing index list.
+        void (*m_setTSpaceBasic)(const SMikkTSpaceContext * pContext, const float fvTangent[], const float fSign, const int iFace, const int iVert);
+
+        // This function is used to return tangent space results to the application.
+        // fvTangent and fvBiTangent are unit length vectors and fMagS and fMagT are their
+        // true magnitudes which can be used for relief mapping effects.
+        // fvBiTangent is the "real" bitangent and thus may not be perpendicular to fvTangent.
+        // However, both are perpendicular to the vertex normal.
+        // For normal maps it is sufficient to use the following simplified version of the bitangent which is generated at pixel/vertex level.
+        // fSign = bIsOrientationPreserving ? 1.0f : (-1.0f);
+        // bitangent = fSign * cross(vN, tangent);
+        // Note that the results are returned unindexed. It is possible to generate a new index list
+        // But averaging/overwriting tangent spaces by using an already existing index list WILL produce INCRORRECT results.
+        // DO NOT! use an already existing index list.
+        void (*m_setTSpace)(const SMikkTSpaceContext * pContext, const float fvTangent[], const float fvBiTangent[], const float fMagS, const float fMagT,
+                                                const tbool bIsOrientationPreserving, const int iFace, const int iVert);
+} SMikkTSpaceInterface;
+
+struct SMikkTSpaceContext
+{
+        SMikkTSpaceInterface * m_pInterface;    // initialized with callback functions
+        void * m_pUserData;                                             // pointer to client side mesh data etc. (passed as the first parameter with every interface call)
+};
+
+// these are both thread safe!
+tbool genTangSpaceDefault(const SMikkTSpaceContext * pContext); // Default (recommended) fAngularThreshold is 180 degrees (which means threshold disabled)
+tbool genTangSpace(const SMikkTSpaceContext * pContext, const float fAngularThreshold);
+
+
+// To avoid visual errors (distortions/unwanted hard edges in lighting), when using sampled normal maps, the
+// normal map sampler must use the exact inverse of the pixel shader transformation.
+// The most efficient transformation we can possibly do in the pixel shader is
+// achieved by using, directly, the "unnormalized" interpolated tangent, bitangent and vertex normal: vT, vB and vN.
+// pixel shader (fast transform out)
+// vNout = normalize( vNt.x * vT + vNt.y * vB + vNt.z * vN );
+// where vNt is the tangent space normal. The normal map sampler must likewise use the
+// interpolated and "unnormalized" tangent, bitangent and vertex normal to be compliant with the pixel shader.
+// sampler does (exact inverse of pixel shader):
+// float3 row0 = cross(vB, vN);
+// float3 row1 = cross(vN, vT);
+// float3 row2 = cross(vT, vB);
+// float fSign = dot(vT, row0)<0 ? -1 : 1;
+// vNt = normalize( fSign * float3(dot(vNout,row0), dot(vNout,row1), dot(vNout,row2)) );
+// where vNout is the sampled normal in some chosen 3D space.
+//
+// Should you choose to reconstruct the bitangent in the pixel shader instead
+// of the vertex shader, as explained earlier, then be sure to do this in the normal map sampler also.
+// Finally, beware of quad triangulations. If the normal map sampler doesn't use the same triangulation of
+// quads as your renderer then problems will occur since the interpolated tangent spaces will differ
+// eventhough the vertex level tangent spaces match. This can be solved either by triangulating before
+// sampling/exporting or by using the order-independent choice of diagonal for splitting quads suggested earlier.
+// However, this must be used both by the sampler and your tools/rendering pipeline.
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/contrib/cgltf-tangents/README.md b/contrib/cgltf-tangents/README.md
new file mode 100644
index 0000000..2a68b27
--- /dev/null
+++ b/contrib/cgltf-tangents/README.md
@@ -0,0 +1,42 @@
+# cgltf-tangents
+
+A library to compute missing tangent vectors in glTF models using MikkTSpace.
+
+## Example
+
+```
+// Load the glTF scene and buffers as usual.
+cgltf_result result = cgltf_parse_file(&options, filepath, &data);
+cgltf_load_buffers(&options, data, filepath);
+
+// Compute missing tangents.
+cgltfTangentBuffer* tangent_buffers = 0;
+cgltf_size num_tangent_buffers = 0;
+cgltf_compute_tangents(&options, data, &tangent_buffers, &num_tangent_buffers);
+```
+
+## About
+
+This is a single-header/source library that combines
+[MikkTSpace](https://github.com/mmikk/MikkTSpace) and
+[cgltf](https://github.com/jkuhlmann/cgltf) to compute missing tangent vectors
+for models.
+
+Mesh primitives in glTF may have a normal map but not necessarily tangent
+vectors. An example is the
+[DamagedHelmet](https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/DamagedHelmet/glTF)
+sample. From the
+[spec](https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#meshes):
+
+*"When tangents are not specified, client implementations SHOULD calculate
+tangents using default MikkTSpace algorithms with the specified vertex
+positions, normals, and texture coordinates associated with the normal texture."*
+
+cgltf-tangents takes an input glTF scene and scans it for mesh primitives that
+have a normal map but no tangents. cgltf-tangents then invokes MikkTSpace to
+compute tangents for those mesh primitives and outputs an array of tangent
+buffers. The client can then upload these buffers to GPU memory for rendering.
+
+See `test/` for a complete example.
+
+MikkTSpace is packaged here for convenience. cgltf must be obtained separately.
diff --git a/contrib/cgltf-tangents/cgltf_tangents.c b/contrib/cgltf-tangents/cgltf_tangents.c
new file mode 100644
index 0000000..80b1e56
--- /dev/null
+++ b/contrib/cgltf-tangents/cgltf_tangents.c
@@ -0,0 +1,618 @@
+/*
+Copyright 2022 Marc Sunet
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation and/or
+other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+#include "cgltf_tangents.h"
+#include "cgltf.h"
+
+#include "MikkTSpace/mikktspace.h"
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef CGLTF_TANGENTS_DEBUG
+#include <stdio.h>
+#define DLOG printf
+#else
+#define DLOG(...)
+#endif
+
+#include <stdio.h> // TODO: Remove me.
+
+#define CGLTF_OPTIONS_MALLOC(size)                                             \
+  options->memory.alloc(options->memory.user_data, size)
+
+#define CGLTF_OPTIONS_FREE(ptr)                                                \
+  options->memory.free(options->memory.user_data, ptr)
+
+static void* cgltf_default_alloc(void* user, cgltf_size size) {
+  (void)user;
+  return malloc(size);
+}
+
+static void cgltf_default_free(void* user, void* ptr) {
+  (void)user;
+  free(ptr);
+}
+
+static const cgltf_size NUM_TANGENT_COMPONENTS = 4; // X,Y,Z,fSign
+
+static float normalize_i8(int8_t x) { return (float)x / 128.0; }
+static float normalize_u8(uint8_t x) { return (float)x / 255.0; }
+static float normalize_i16(int16_t x) { return (float)x / 32768.0; }
+static float normalize_u16(uint16_t x) { return (float)x / 65535.0; }
+static float normalize_u32(uint32_t x) { return (float)x / 4294967295.0; }
+
+static cgltf_size num_vertex_attrib_components(cgltf_type type) {
+  switch (type) {
+  case cgltf_type_scalar:
+    return 1;
+  case cgltf_type_vec2:
+    return 2;
+  case cgltf_type_vec3:
+    return 3;
+  case cgltf_type_vec4:
+    return 4;
+  default:
+    assert(false);
+    return 0;
+  }
+}
+
+static cgltf_size cgltf_component_type_size_bytes(cgltf_component_type type) {
+  switch (type) {
+  case cgltf_component_type_r_8:
+    return 1;
+  case cgltf_component_type_r_8u:
+    return 1;
+  case cgltf_component_type_r_16:
+    return 2;
+  case cgltf_component_type_r_16u:
+    return 2;
+  case cgltf_component_type_r_32u:
+    return 4;
+  case cgltf_component_type_r_32f:
+    return 4;
+  default:
+    assert(false);
+    return 0;
+  }
+}
+
+static cgltf_size default_stride(cgltf_type type,
+                                 cgltf_component_type component_type) {
+  return num_vertex_attrib_components(type) *
+         cgltf_component_type_size_bytes(component_type);
+}
+
+// -----------------------------------------------------------------------------
+// MikkTSpace interface
+
+// An array of values for a given vertex attribute or for vertex indices.
+// For positions and normals, glTF mandates floats.
+// Texcoords and indices can be different types and vary in size: 8-bit, 16-bit,
+// or 32-bit.
+// We store void* pointers so that we can do byte pointer arithmetic.
+typedef struct Buffer {
+  const void* start;         // X-coordinate of the first attribute.
+  const void* end;           // One byte past the end of the buffer.
+  cgltf_size stride_bytes;   // Stride in bytes between each value.
+  cgltf_component_type type; // Type of each value in the buffer.
+} Buffer;
+
+// User data for mesh processing.
+// See: https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#meshes
+// Buffer pointers have the accessor + view offsets baked in so that we do the
+// addition only once.
+typedef struct SMikkUserData {
+  const cgltf_primitive* primitive;
+  // Index buffer may be empty (mesh primitive has no indices).
+  Buffer indices;
+  // Vertex attributes.
+  Buffer positions;
+  Buffer normals;
+  Buffer texcoords;
+  // Output tangents.
+  void* tangents;
+} SMikkUserData;
+
+static cgltf_size get_vertex_index(const SMikkUserData* data, cgltf_size iFace,
+                                   cgltf_size iVert) {
+  const cgltf_primitive* primitive = data->primitive;
+
+  // First compute a vertex index as if the mesh primitive had no indices.
+  cgltf_size vertex_idx = 0;
+  switch (primitive->type) {
+  case cgltf_primitive_type_triangles:
+    vertex_idx = iFace * 3 + iVert;
+    break;
+  case cgltf_primitive_type_triangle_strip:
+    // For triangle strips:
+    // face 0 -> verts 0, 1, 2
+    // face 1 -> verts 1, 3, 2 (1, 2, 3 flipped)
+    // face 2 -> verts 2, 3, 4
+    // face 3 -> verts 3, 5, 4 (3, 4, 5 flipped)
+    // ...
+    // face N=2k   -> verts N, N+1, N+2
+    // face N=2k+1 -> verts N, N+2, N+1
+    if (iFace & 1) {
+      // Flip the winding of odd faces so that the is consistent with the even
+      // ones.
+      // iVert = 0 -> vert 0
+      // iVert = 1 -> vert 2
+      // iVert = 2 -> vert 1
+      vertex_idx = iFace + (2 - iVert);
+    } else {
+      vertex_idx = iFace + iVert;
+    }
+    break;
+  case cgltf_primitive_type_triangle_fan:
+    // For triangle fans:
+    // face 0 -> verts 0, 1, 2
+    // face 1 -> verts 0, 2, 3
+    // face 2 -> verts 0, 3, 4
+    // face 3 -> verts 0, 4, 5
+    // ...
+    // face N -> verts 0, N=1, N=2
+    if (iVert == 0) {
+      vertex_idx = 0;
+    } else {
+      vertex_idx = iFace + iVert;
+    }
+    break;
+  default:
+    assert(false);
+    break;
+  }
+
+  // If the mesh primitive has vertex indices, then vertex_idx is actually the
+  // index of the index. Index the index buffer with vertex_idx to find the
+  // real vertex index.
+  if (primitive->indices != NULL) {
+    const void* p_idx =
+        data->indices.start + vertex_idx * data->indices.stride_bytes;
+    switch (data->indices.type) {
+    case cgltf_component_type_r_8:
+      vertex_idx = *((int8_t*)p_idx);
+      break;
+    case cgltf_component_type_r_8u:
+      vertex_idx = *((uint8_t*)p_idx);
+      break;
+    case cgltf_component_type_r_16:
+      vertex_idx = *((int16_t*)p_idx);
+      break;
+    case cgltf_component_type_r_16u:
+      vertex_idx = *((uint16_t*)p_idx);
+      break;
+    case cgltf_component_type_r_32u:
+      vertex_idx = *((uint32_t*)p_idx);
+      break;
+    default:
+      assert(false);
+      break;
+    }
+  }
+
+  return vertex_idx;
+}
+
+static const void* get_vertex(const Buffer* buffer, cgltf_size index) {
+  // Stride is the offset in bytes between vertex attributes.
+  const void* vertex = buffer->start + buffer->stride_bytes * index;
+  assert(vertex < buffer->end);
+  return vertex;
+}
+
+static const void* get_position(const SMikkUserData* data, cgltf_size index) {
+  return get_vertex(&data->positions, index);
+}
+
+static const void* get_normal(const SMikkUserData* data, cgltf_size index) {
+  return get_vertex(&data->normals, index);
+}
+
+static const void* get_texcoord(const SMikkUserData* data, cgltf_size index) {
+  return get_vertex(&data->texcoords, index);
+}
+
+static float* get_tangent(void* buffer, cgltf_size index) {
+  // Tangents are tightly packed.
+  return (float*)(buffer) + NUM_TANGENT_COMPONENTS * index;
+}
+
+static int SMikk_get_num_faces(const SMikkTSpaceContext* pContext) {
+  SMikkUserData* data = (SMikkUserData*)pContext->m_pUserData;
+  const cgltf_primitive* primitive = data->primitive;
+
+  // Find the number of effective vertices (vertices or indices) in the mesh
+  // primitive.
+  //
+  // https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#meshes
+  //
+  // "All attribute accessors for a given primitive MUST have the same count.
+  // When indices property is not defined, attribute accessors' count indicates
+  // the number of vertices to render; when indices property is defined, it
+  // indicates the upper (exclusive) bound on the index values in the indices
+  // accessor, i.e., all index values MUST be less than attribute accessors'
+  // count."
+  const cgltf_size num_verts = (primitive->indices != NULL)
+                                   ? primitive->indices->count
+                                   : primitive->attributes_count;
+
+  // Determine the number of faces given the number of vertices.
+  //
+  // We use the fact that glTF only supports triangles for faces.
+  // https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#meshes
+  switch (primitive->type) {
+  case cgltf_primitive_type_triangles:
+    return (int)num_verts / 3;
+  case cgltf_primitive_type_triangle_strip:
+  case cgltf_primitive_type_triangle_fan:
+    return (int)num_verts - 2;
+  default:
+    return 0;
+  }
+}
+
+int SMikk_get_num_vertices_of_face(const SMikkTSpaceContext* pContext,
+                                   const int iFace) {
+  // Triangles are the only faces supported by glTF.
+  // https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#meshes
+  return 3;
+}
+
+void SMikk_get_position(const SMikkTSpaceContext* pContext, float fvPosOut[],
+                        const int iFace, const int iVert) {
+  const SMikkUserData* data = (SMikkUserData*)pContext->m_pUserData;
+  const cgltf_primitive* primitive = data->primitive;
+
+  const cgltf_size idx = get_vertex_index(data, iFace, iVert);
+  const float* coord = get_position(data, idx);
+  fvPosOut[0] = *coord++;
+  fvPosOut[1] = *coord++;
+  fvPosOut[2] = *coord;
+  DLOG("Position (face: %d, vert: %d): %f, %f, %f; idx: %lu\n", iFace, iVert,
+       fvPosOut[0], fvPosOut[1], fvPosOut[2], idx);
+}
+
+void SMikk_get_normal(const SMikkTSpaceContext* pContext, float fvNormOut[],
+                      const int iFace, const int iVert) {
+  const SMikkUserData* data = (SMikkUserData*)pContext->m_pUserData;
+  const cgltf_primitive* primitive = data->primitive;
+
+  const cgltf_size idx = get_vertex_index(data, iFace, iVert);
+  const float* coord = get_normal(data, idx);
+  fvNormOut[0] = *coord++;
+  fvNormOut[1] = *coord++;
+  fvNormOut[2] = *coord;
+  DLOG("Normal (face: %d, vert: %d): %f, %f, %f\n", iFace, iVert, fvNormOut[0],
+       fvNormOut[1], fvNormOut[2]);
+}
+
+void SMikk_get_texcoord(const SMikkTSpaceContext* pContext, float fvTexcOut[],
+                        const int iFace, const int iVert) {
+  const SMikkUserData* data = (SMikkUserData*)pContext->m_pUserData;
+  const cgltf_primitive* primitive = data->primitive;
+
+  const cgltf_size idx = get_vertex_index(data, iFace, iVert);
+  const void* coord = get_texcoord(data, idx);
+  switch (data->texcoords.type) {
+  case cgltf_component_type_r_8: {
+    const int8_t* c = coord;
+    fvTexcOut[0] = normalize_i8(*c++);
+    fvTexcOut[1] = normalize_i8(*c);
+    break;
+  }
+  case cgltf_component_type_r_8u: {
+    const uint8_t* c = coord;
+    fvTexcOut[0] = normalize_u8(*c++);
+    fvTexcOut[1] = normalize_u8(*c);
+    break;
+  }
+  case cgltf_component_type_r_16: {
+    const int16_t* c = coord;
+    fvTexcOut[0] = normalize_i16(*c++);
+    fvTexcOut[1] = normalize_i16(*c);
+    break;
+  }
+  case cgltf_component_type_r_16u: {
+    const uint16_t* c = coord;
+    fvTexcOut[0] = normalize_u16(*c++);
+    fvTexcOut[1] = normalize_u16(*c);
+    break;
+  }
+  case cgltf_component_type_r_32u: {
+    const uint32_t* c = coord;
+    fvTexcOut[0] = normalize_u32(*c++);
+    fvTexcOut[1] = normalize_u32(*c);
+    break;
+  }
+  case cgltf_component_type_r_32f: {
+    const float* c = coord;
+    fvTexcOut[0] = *c++;
+    fvTexcOut[1] = *c;
+    break;
+  }
+  default:
+    assert(false);
+    break;
+  }
+  DLOG("Texcoord (face: %d, vert: %d): %f, %f\n", iFace, iVert, fvTexcOut[0],
+       fvTexcOut[1]);
+}
+
+void SMikk_set_TSpace_basic(const SMikkTSpaceContext* pContext,
+                            const float fvTangent[], const float fSign,
+                            const int iFace, const int iVert) {
+  SMikkUserData* data = (SMikkUserData*)pContext->m_pUserData;
+  const cgltf_primitive* primitive = data->primitive;
+
+  const cgltf_size idx = get_vertex_index(data, iFace, iVert);
+  float* coord = get_tangent(data->tangents, idx);
+  *coord++ = fvTangent[0];
+  *coord++ = fvTangent[1];
+  *coord++ = fvTangent[2];
+  *coord = fSign;
+  DLOG("Tangent (face: %d, vert: %d): %f, %f, %f; sign: %f\n", iFace, iVert,
+       fvTangent[0], fvTangent[1], fvTangent[2], fSign);
+}
+
+// -----------------------------------------------------------------------------
+
+static bool has_normal_map(const cgltf_primitive* primitive) {
+  return (primitive->material != NULL) &&
+         (primitive->material->normal_texture.texture != NULL);
+}
+
+static const cgltf_attribute* find_attribute(const cgltf_primitive* primitive,
+                                             cgltf_attribute_type type) {
+  for (cgltf_size i = 0; i < primitive->attributes_count; ++i) {
+    const cgltf_attribute* attrib = &primitive->attributes[i];
+    if (attrib->type == type) {
+      return attrib;
+    }
+  }
+  return NULL;
+}
+
+static bool has_attribute(const cgltf_primitive* primitive,
+                          cgltf_attribute_type type) {
+  return find_attribute(primitive, type) != NULL;
+}
+
+static bool has_positions3d(const cgltf_primitive* primitive) {
+  const cgltf_attribute* attrib =
+      find_attribute(primitive, cgltf_attribute_type_position);
+  if (attrib) {
+    return attrib->data->type == cgltf_type_vec3;
+  }
+  return false;
+}
+
+static bool has_normals(const cgltf_primitive* primitive) {
+  return has_attribute(primitive, cgltf_attribute_type_normal);
+}
+
+static bool has_texcoords(const cgltf_primitive* primitive) {
+  return has_attribute(primitive, cgltf_attribute_type_texcoord);
+}
+
+static bool has_tangents(const cgltf_primitive* primitive) {
+  return has_attribute(primitive, cgltf_attribute_type_tangent);
+}
+
+static bool has_indices(const cgltf_primitive* primitive) {
+  return primitive->indices != 0;
+}
+
+static cgltfTangentBuffer compute_tangents(const cgltf_options* options,
+                                           const cgltf_data* data,
+                                           cgltf_primitive* primitive) {
+  cgltfTangentBuffer buffer = {0};
+  SMikkUserData user = {0};
+  cgltf_size num_verts = 0;
+
+  user.primitive = primitive;
+
+  if (primitive->indices != NULL) {
+    const cgltf_accessor* accessor = primitive->indices;
+    const cgltf_buffer_view* view = accessor->buffer_view;
+    const cgltf_size offset_bytes = accessor->offset + view->offset;
+    const void* buffer_data = view->buffer->data + offset_bytes;
+    const void* buffer_end = view->buffer->data + view->offset + view->size;
+
+    user.indices.start = buffer_data;
+    user.indices.end = buffer_end;
+    // Indices are tightly packed, stride 0.
+    user.indices.stride_bytes =
+        default_stride(accessor->type, accessor->component_type);
+    user.indices.type = accessor->component_type;
+  }
+
+  for (cgltf_size i = 0; i < primitive->attributes_count; ++i) {
+    const cgltf_attribute* attrib = &primitive->attributes[i];
+
+    if ((attrib->type == cgltf_attribute_type_position) ||
+        (attrib->type == cgltf_attribute_type_normal) ||
+        (attrib->type == cgltf_attribute_type_texcoord)) {
+      const cgltf_accessor* accessor = attrib->data;
+      const cgltf_buffer_view* view = accessor->buffer_view;
+      const cgltf_buffer* buffer = view->buffer;
+      const cgltf_size offset_bytes = accessor->offset + view->offset;
+      const cgltf_size stride_bytes =
+          view->stride > 0
+              ? view->stride
+              : default_stride(accessor->type, accessor->component_type);
+      // const cgltf_size size_bytes = view->size;
+      const void* buffer_data = view->buffer->data + offset_bytes;
+      const void* buffer_end = view->buffer->data + view->offset + view->size;
+
+      Buffer* attrib_buffer = 0;
+
+      if (attrib->type == cgltf_attribute_type_position) {
+        // glTF currently mandates vec3 for positions. Caller should ensure
+        // this.
+        assert(accessor->type == cgltf_type_vec3);
+        num_verts = attrib->data->count;
+        attrib_buffer = &user.positions;
+      } else if (attrib->type == cgltf_attribute_type_normal) {
+        attrib_buffer = &user.normals;
+      } else if (attrib->type == cgltf_attribute_type_texcoord) {
+        attrib_buffer = &user.texcoords;
+      }
+
+      attrib_buffer->start = buffer_data;
+      attrib_buffer->end = buffer_end;
+      attrib_buffer->stride_bytes = stride_bytes;
+      attrib_buffer->type = accessor->component_type;
+    }
+  }
+
+  assert(user.positions.start);
+  assert(user.positions.end);
+  assert(user.normals.start);
+  assert(user.normals.end);
+  assert(user.texcoords.start);
+  assert(user.texcoords.end);
+  assert(num_verts > 0);
+
+  const cgltf_size tangents_size_bytes =
+      num_verts * NUM_TANGENT_COMPONENTS * sizeof(float);
+
+  user.tangents = CGLTF_OPTIONS_MALLOC(tangents_size_bytes);
+  if (!user.tangents) {
+    return buffer;
+  }
+
+  SMikkTSpaceInterface interface = (SMikkTSpaceInterface){
+      .m_getNumFaces = SMikk_get_num_faces,
+      .m_getNumVerticesOfFace = SMikk_get_num_vertices_of_face,
+      .m_getPosition = SMikk_get_position,
+      .m_getNormal = SMikk_get_normal,
+      .m_getTexCoord = SMikk_get_texcoord,
+      .m_setTSpaceBasic = SMikk_set_TSpace_basic,
+  };
+  const SMikkTSpaceContext context = (SMikkTSpaceContext){
+      .m_pInterface = &interface,
+      .m_pUserData = &user,
+  };
+  if (!genTangSpaceDefault(&context)) {
+    return buffer;
+  }
+
+  buffer.data = user.tangents;
+  buffer.size_bytes = tangents_size_bytes;
+  buffer.primitive = primitive;
+
+  return buffer;
+}
+
+static void process_primitive(const cgltf_options* options,
+                              const cgltf_data* data,
+                              cgltf_primitive* primitive,
+                              cgltfTangentBuffer* tangent_buffers,
+                              cgltf_size* num_tangent_buffers) {
+  DLOG("Processing primitive\n");
+  cgltf_size cur_buffer = 0;
+  // TODO: MikkTSpace should not be used with models with vertex indices. One
+  // workaround is to unindex the mesh, compute tangents, and then re-index it.
+  if (((primitive->type == cgltf_primitive_type_triangle_fan) ||
+       (primitive->type == cgltf_primitive_type_triangle_strip) ||
+       (primitive->type == cgltf_primitive_type_triangles)) &&
+      has_normal_map(primitive) && !has_tangents(primitive) &&
+      has_positions3d(primitive) && has_normals(primitive) &&
+      has_texcoords(primitive) && !has_indices(primitive)) {
+    *num_tangent_buffers += 1;
+    if (tangent_buffers) {
+      DLOG("Model with normal map missing tangents detected\n");
+      tangent_buffers[cur_buffer] = compute_tangents(options, data, primitive);
+      if (tangent_buffers[cur_buffer].data) {
+        DLOG("Tangents computed\n");
+      }
+      cur_buffer++;
+    }
+  }
+}
+
+cgltf_result cgltf_compute_tangents(const cgltf_options* input_options,
+                                    const cgltf_data* data,
+                                    cgltfTangentBuffer** tangent_buffers,
+                                    cgltf_size* num_tangent_buffers) {
+  if ((input_options == NULL) || (data == NULL)) {
+    return cgltf_result_invalid_options;
+  }
+
+  DLOG("cgltf_compute_tangents\n");
+
+  cgltf_options options = *input_options;
+  if (options.memory.alloc == NULL) {
+    options.memory.alloc = &cgltf_default_alloc;
+  }
+  if (options.memory.free == NULL) {
+    options.memory.free = &cgltf_default_free;
+  }
+
+  // First pass: compute the number of tangent buffers to be created.
+  *num_tangent_buffers = 0;
+  for (cgltf_size mesh_idx = 0; mesh_idx < data->meshes_count; ++mesh_idx) {
+    const cgltf_mesh* mesh = &data->meshes[mesh_idx];
+
+    for (cgltf_size prim_idx = 0; prim_idx < mesh->primitives_count;
+         ++prim_idx) {
+      // Pass in null for the tangent buffers to just compute the number of
+      // buffers.
+      process_primitive(&options, data, &mesh->primitives[prim_idx], 0,
+                        num_tangent_buffers);
+    }
+  }
+  DLOG("Number of primitives to be patched: %lu\n", *num_tangent_buffers);
+
+  // Second pass: compute the tangents.
+  if (*num_tangent_buffers > 0) {
+    *tangent_buffers =
+        options.memory.alloc(options.memory.user_data,
+                             *num_tangent_buffers * sizeof(cgltfTangentBuffer));
+    if (!*tangent_buffers) {
+      return cgltf_result_out_of_memory;
+    }
+
+    cgltf_size tangent_buffers_computed = 0;
+
+    for (cgltf_size mesh_idx = 0; mesh_idx < data->meshes_count; ++mesh_idx) {
+      const cgltf_mesh* mesh = &data->meshes[mesh_idx];
+
+      for (cgltf_size prim_idx = 0; prim_idx < mesh->primitives_count;
+           ++prim_idx) {
+        process_primitive(&options, data, &mesh->primitives[prim_idx],
+                          *tangent_buffers, &tangent_buffers_computed);
+      }
+    }
+
+    assert(tangent_buffers_computed == *num_tangent_buffers);
+  }
+
+  return cgltf_result_success;
+}
diff --git a/contrib/cgltf-tangents/cgltf_tangents.h b/contrib/cgltf-tangents/cgltf_tangents.h
new file mode 100644
index 0000000..79e3502
--- /dev/null
+++ b/contrib/cgltf-tangents/cgltf_tangents.h
@@ -0,0 +1,67 @@
+/*
+Copyright 2022 Marc Sunet
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation and/or
+other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+#ifndef CGLTF_TANGENTS_H_INCLUDED__
+#define CGLTF_TANGENTS_H_INCLUDED__
+
+#include <cgltf.h>
+
+/// A buffer that holds tangent vectors.
+///
+/// Tangent vectors are tightly packed in the array.
+///
+/// Tangent vectors have 4 coordinates: (X,Y,Z) for the vector, W for the sign.
+/// The usual rules of MikkTSpace apply, namely that the bitangent should be
+/// computed as:
+///
+///   bitangent = tangent.w * cross(normal, tangent.xyz);
+///
+/// Refer to the MikkTSpace documentation for more details.
+///
+/// The primitive pointer points to the mesh primitive for which the tangents in
+/// this buffer were computed. When your application loads mesh primitives, it
+/// can scan the cgltfTangetBuffer array outputed by cgltf_compute_tangents() to
+/// see whether tangents were computed for the mesh primitive.
+typedef struct cgltfTangentBuffer {
+  void* data;                 // X-coordinate of the first tangent vector.
+  cgltf_size size_bytes;      // Total Size of data in bytes.
+  cgltf_primitive* primitive; // The primitive these tangents belong to.
+} cgltfTangentBuffer;
+
+/// Compute tangent vectors for normal-mapped mesh primitives missing them.
+///
+/// cgltf_options can be zeroed out but must be non-null.
+///
+/// cgltf_data is the scene previously loaded by cgltf.
+///
+/// out_tangent_buffers is an output array of tangent buffers, one buffer per
+/// mesh primitive for which tangents were computed.
+///
+/// out_num_tangent_buffers is the number of tangent buffers in the output
+/// array.
+cgltf_result cgltf_compute_tangents(const cgltf_options*, const cgltf_data*,
+                                    cgltfTangentBuffer** out_tangent_buffers,
+                                    cgltf_size* out_num_tangent_buffers);
+
+#endif // CGLTF_TANGENTS_H_INCLUDED__
diff --git a/contrib/cgltf-tangents/test/CMakeLists.txt b/contrib/cgltf-tangents/test/CMakeLists.txt
new file mode 100644
index 0000000..422c950
--- /dev/null
+++ b/contrib/cgltf-tangents/test/CMakeLists.txt
@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 3.0)
+
+project (cgltf-test)
+
+add_executable(cgltf-test
+  main.c)
+
+target_link_libraries(cgltf-test
+  cgltf
+  cgltf-tangents
+  -lm)
diff --git a/contrib/cgltf-tangents/test/main.c b/contrib/cgltf-tangents/test/main.c
new file mode 100644
index 0000000..0d70008
--- /dev/null
+++ b/contrib/cgltf-tangents/test/main.c
@@ -0,0 +1,86 @@
+/*
+Copyright 2022 Marc Sunet
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation and/or
+other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+#include <cgltf_tangents.h>
+#define CGLTF_IMPLEMENTATION
+#include <cgltf.h>
+
+#include <stdio.h>
+
+void print_tangent_buffer(const cgltfTangentBuffer* buffer, int max_vectors) {
+  printf("Tangent buffer for primitive (%p) (%lu bytes):\n", buffer->primitive,
+         buffer->size_bytes);
+
+  const float* xyzw = (const float*)buffer->data;
+  const float* end = (const float*)(buffer->data + buffer->size_bytes);
+
+  for (int i = 0; i < max_vectors && xyzw < end; ++i, xyzw += 4) {
+    printf("(%3.2f, %3.2f, %3.2f, sign: %3.2f)\n", *xyzw, *(xyzw + 1),
+           *(xyzw + 2), *(xyzw + 3));
+  }
+  printf("--------------------");
+}
+
+void usage(const char* argv0) {
+  fprintf(stderr, "Usage: %s <glTF file path>\n", argv0);
+}
+
+int main(int argc, const char** argv) {
+  cgltf_options options = {0};
+  cgltf_data* data = NULL;
+
+  if (argc != 2) {
+    usage(argv[0]);
+    return 0;
+  }
+
+  const char* filepath = argv[1];
+
+  cgltf_result result = cgltf_parse_file(&options, filepath, &data);
+  if (result != cgltf_result_success) {
+    cgltf_free(data);
+    return 1;
+  }
+
+  // Must call cgltf_load_buffers() to load buffer data.
+  result = cgltf_load_buffers(&options, data, filepath);
+  if (result != cgltf_result_success) {
+    cgltf_free(data);
+    return 2;
+  }
+
+  cgltfTangentBuffer* tangent_buffers = 0;
+  cgltf_size num_tangent_buffers = 0;
+  cgltf_compute_tangents(&options, data, &tangent_buffers,
+                         &num_tangent_buffers);
+
+  // cgltf scene not needed beyond this point.
+  cgltf_free(data);
+
+  for (cgltf_size i = 0; i < num_tangent_buffers; ++i) {
+    print_tangent_buffer(tangent_buffers, 10);
+  }
+
+  return 0;
+}
diff --git a/contrib/cgltf/CMakeLists.txt b/contrib/cgltf/CMakeLists.txt
new file mode 100644
index 0000000..0ac840a
--- /dev/null
+++ b/contrib/cgltf/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.16)
+
+project(cgltf)
+
+add_library(cgltf INTERFACE)
+
+target_include_directories(cgltf INTERFACE
+  ${CMAKE_CURRENT_SOURCE_DIR})
diff --git a/contrib/cgltf/LICENSE b/contrib/cgltf/LICENSE
new file mode 100644
index 0000000..0afe8c7
--- /dev/null
+++ b/contrib/cgltf/LICENSE
@@ -0,0 +1,7 @@
+Copyright (c) 2018 Johannes Kuhlmann
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/contrib/cgltf/README.md b/contrib/cgltf/README.md
new file mode 100644
index 0000000..3b49d52
--- /dev/null
+++ b/contrib/cgltf/README.md
@@ -0,0 +1,154 @@
+# :diamond_shape_with_a_dot_inside: cgltf
+**Single-file/stb-style C glTF loader and writer**
+
+[![Build Status](https://travis-ci.org/jkuhlmann/cgltf.svg?branch=master)](https://travis-ci.org/jkuhlmann/cgltf)
+
+Used in: [bgfx](https://github.com/bkaradzic/bgfx), [Filament](https://github.com/google/filament), [meshoptimizer](https://github.com/zeux/meshoptimizer), [raylib](https://github.com/raysan5/raylib), and more!
+
+## Usage: Loading
+Loading from file:
+```c
+#define CGLTF_IMPLEMENTATION
+#include "cgltf.h"
+
+cgltf_options options = {0};
+cgltf_data* data = NULL;
+cgltf_result result = cgltf_parse_file(&options, "scene.gltf", &data);
+if (result == cgltf_result_success)
+{
+        /* TODO make awesome stuff */
+        cgltf_free(data);
+}
+```
+
+Loading from memory:
+```c
+#define CGLTF_IMPLEMENTATION
+#include "cgltf.h"
+
+void* buf; /* Pointer to glb or gltf file data */
+size_t size; /* Size of the file data */
+
+cgltf_options options = {0};
+cgltf_data* data = NULL;
+cgltf_result result = cgltf_parse(&options, buf, size, &data);
+if (result == cgltf_result_success)
+{
+        /* TODO make awesome stuff */
+        cgltf_free(data);
+}
+```
+
+Note that cgltf does not load the contents of extra files such as buffers or images into memory by default. You'll need to read these files yourself using URIs from `data.buffers[]` or `data.images[]` respectively.
+For buffer data, you can alternatively call `cgltf_load_buffers`, which will use `FILE*` APIs to open and read buffer files.
+
+**For more in-depth documentation and a description of the public interface refer to the top of the `cgltf.h` file.**
+
+## Usage: Writing
+When writing glTF data, you need a valid `cgltf_data` structure that represents a valid glTF document. You can construct such a structure yourself or load it using the loader functions described above. The writer functions do not deallocate any memory. So, you either have to do it manually or call `cgltf_free()` if you got the data by loading it from a glTF document.
+
+Writing to file:
+```c
+#define CGLTF_IMPLEMENTATION
+#define CGLTF_WRITE_IMPLEMENTATION
+#include "cgltf_write.h"
+
+cgltf_options options = {0};
+cgltf_data* data = /* TODO must be valid data */;
+cgltf_result result = cgltf_write_file(&options, "out.gltf", data);
+if (result != cgltf_result_success)
+{
+        /* TODO handle error */
+}
+```
+
+Writing to memory:
+```c
+#define CGLTF_IMPLEMENTATION
+#define CGLTF_WRITE_IMPLEMENTATION
+#include "cgltf_write.h"
+cgltf_options options = {0};
+cgltf_data* data = /* TODO must be valid data */;
+
+cgltf_size size = cgltf_write(&options, NULL, 0, data);
+
+char* buf = malloc(size);
+
+cgltf_size written = cgltf_write(&options, buf, size, data);
+if (written != size)
+{
+        /* TODO handle error */
+}
+```
+
+Note that cgltf does not write the contents of extra files such as buffers or images. You'll need to write this data yourself.
+
+Writing does not yet support "extras" data.
+
+**For more in-depth documentation and a description of the public interface refer to the top of the `cgltf_write.h` file.**
+
+
+## Features
+cgltf supports core glTF 2.0:
+- glb (binary files) and gltf (JSON files)
+- meshes (including accessors, buffer views, buffers)
+- materials (including textures, samplers, images)
+- scenes and nodes
+- skins
+- animations
+- cameras
+- morph targets
+- extras data
+
+cgltf also supports some glTF extensions:
+- KHR_draco_mesh_compression (requires a library like [Google's Draco](https://github.com/google/draco) for decompression though)
+- KHR_lights_punctual
+- KHR_materials_clearcoat
+- KHR_materials_ior
+- KHR_materials_pbrSpecularGlossiness
+- KHR_materials_specular
+- KHR_materials_transmission
+- KHR_materials_unlit
+- KHR_texture_transform
+
+cgltf does **not** yet support unlisted extensions. However, unlisted extensions can be accessed via "extensions" member on objects.
+
+## Building
+The easiest approach is to integrate the `cgltf.h` header file into your project. If you are unfamiliar with single-file C libraries (also known as stb-style libraries), this is how it goes:
+
+1. Include `cgltf.h` where you need the functionality.
+1. Have exactly one source file that defines `CGLTF_IMPLEMENTATION` before including `cgltf.h`.
+1. Use the cgltf functions as described above.
+
+Support for writing can be found in a separate file called `cgltf_write.h` (which includes `cgltf.h`). Building it works analogously using the `CGLTF_WRITE_IMPLEMENTATION` define.
+
+## Contributing
+Everyone is welcome to contribute to the library. If you find any problems, you can submit them using [GitHub's issue system](https://github.com/jkuhlmann/cgltf/issues). If you want to contribute code, you should fork the project and then send a pull request.
+
+
+## Dependencies
+None.
+
+C headers being used by implementation:
+```
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <limits.h>
+```
+
+Note, this library has a copy of the [JSMN JSON parser](https://github.com/zserge/jsmn) embedded in its source.
+
+## Testing
+There is a Python script in the `test/` folder that retrieves the glTF 2.0 sample files from the glTF-Sample-Models repository (https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0) and runs the library against all gltf and glb files.
+
+Here's one way to build and run the test:
+
+    cd test ; mkdir build ; cd build ; cmake .. -DCMAKE_BUILD_TYPE=Debug
+    make -j
+    cd ..
+    ./test_all.py
+
+There is also a llvm-fuzz test in `fuzz/`. See http://llvm.org/docs/LibFuzzer.html for more information.
diff --git a/contrib/cgltf/cgltf.h b/contrib/cgltf/cgltf.h
new file mode 100644
index 0000000..077cf36
--- /dev/null
+++ b/contrib/cgltf/cgltf.h
@@ -0,0 +1,5746 @@
+/**
+ * cgltf - a single-file glTF 2.0 parser written in C99.
+ *
+ * Version: 1.7
+ *
+ * Website: https://github.com/jkuhlmann/cgltf
+ *
+ * Distributed under the MIT License, see notice at the end of this file.
+ *
+ * Building:
+ * Include this file where you need the struct and function
+ * declarations. Have exactly one source file where you define
+ * `CGLTF_IMPLEMENTATION` before including this file to get the
+ * function definitions.
+ *
+ * Reference:
+ * `cgltf_result cgltf_parse(const cgltf_options*, const void*,
+ * cgltf_size, cgltf_data**)` parses both glTF and GLB data. If
+ * this function returns `cgltf_result_success`, you have to call
+ * `cgltf_free()` on the created `cgltf_data*` variable.
+ * Note that contents of external files for buffers and images are not
+ * automatically loaded. You'll need to read these files yourself using
+ * URIs in the `cgltf_data` structure.
+ *
+ * `cgltf_options` is the struct passed to `cgltf_parse()` to control
+ * parts of the parsing process. You can use it to force the file type
+ * and provide memory allocation as well as file operation callbacks. 
+ * Should be zero-initialized to trigger default behavior.
+ *
+ * `cgltf_data` is the struct allocated and filled by `cgltf_parse()`.
+ * It generally mirrors the glTF format as described by the spec (see
+ * https://github.com/KhronosGroup/glTF/tree/master/specification/2.0).
+ *
+ * `void cgltf_free(cgltf_data*)` frees the allocated `cgltf_data`
+ * variable.
+ *
+ * `cgltf_result cgltf_load_buffers(const cgltf_options*, cgltf_data*,
+ * const char* gltf_path)` can be optionally called to open and read buffer
+ * files using the `FILE*` APIs. The `gltf_path` argument is the path to
+ * the original glTF file, which allows the parser to resolve the path to
+ * buffer files.
+ *
+ * `cgltf_result cgltf_load_buffer_base64(const cgltf_options* options,
+ * cgltf_size size, const char* base64, void** out_data)` decodes
+ * base64-encoded data content. Used internally by `cgltf_load_buffers()`
+ * and may be useful if you're not dealing with normal files.
+ *
+ * `cgltf_result cgltf_parse_file(const cgltf_options* options, const
+ * char* path, cgltf_data** out_data)` can be used to open the given
+ * file using `FILE*` APIs and parse the data using `cgltf_parse()`.
+ *
+ * `cgltf_result cgltf_validate(cgltf_data*)` can be used to do additional
+ * checks to make sure the parsed glTF data is valid.
+ *
+ * `cgltf_node_transform_local` converts the translation / rotation / scale properties of a node
+ * into a mat4.
+ *
+ * `cgltf_node_transform_world` calls `cgltf_node_transform_local` on every ancestor in order
+ * to compute the root-to-node transformation.
+ *
+ * `cgltf_accessor_unpack_floats` reads in the data from an accessor, applies sparse data (if any),
+ * and converts them to floating point. Assumes that `cgltf_load_buffers` has already been called.
+ * By passing null for the output pointer, users can find out how many floats are required in the
+ * output buffer.
+ *
+ * `cgltf_accessor_num_components` is a tiny utility that tells you the dimensionality of
+ * a certain accessor type. This can be used before `cgltf_accessor_unpack_floats` to help allocate
+ * the necessary amount of memory.
+ *
+ * `cgltf_accessor_read_float` reads a certain element from a non-sparse accessor and converts it to
+ * floating point, assuming that `cgltf_load_buffers` has already been called. The passed-in element
+ * size is the number of floats in the output buffer, which should be in the range [1, 16]. Returns
+ * false if the passed-in element_size is too small, or if the accessor is sparse.
+ *
+ * `cgltf_accessor_read_uint` is similar to its floating-point counterpart, but limited to reading
+ * vector types and does not support matrix types. The passed-in element size is the number of uints
+ * in the output buffer, which should be in the range [1, 4]. Returns false if the passed-in 
+ * element_size is too small, or if the accessor is sparse.
+ *
+ * `cgltf_accessor_read_index` is similar to its floating-point counterpart, but it returns size_t
+ * and only works with single-component data types.
+ *
+ * `cgltf_result cgltf_copy_extras_json(const cgltf_data*, const cgltf_extras*,
+ * char* dest, cgltf_size* dest_size)` allows users to retrieve the "extras" data that
+ * can be attached to many glTF objects (which can be arbitrary JSON data). The
+ * `cgltf_extras` struct stores the offsets of the start and end of the extras JSON data
+ * as it appears in the complete glTF JSON data. This function copies the extras data
+ * into the provided buffer. If `dest` is NULL, the length of the data is written into
+ * `dest_size`. You can then parse this data using your own JSON parser
+ * or, if you've included the cgltf implementation using the integrated JSMN JSON parser.
+ */
+#ifndef CGLTF_H_INCLUDED__
+#define CGLTF_H_INCLUDED__
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef size_t cgltf_size;
+typedef float cgltf_float;
+typedef int cgltf_int;
+typedef unsigned int cgltf_uint;
+typedef int cgltf_bool;
+
+typedef enum cgltf_file_type
+{
+        cgltf_file_type_invalid,
+        cgltf_file_type_gltf,
+        cgltf_file_type_glb,
+} cgltf_file_type;
+
+typedef enum cgltf_result
+{
+        cgltf_result_success,
+        cgltf_result_data_too_short,
+        cgltf_result_unknown_format,
+        cgltf_result_invalid_json,
+        cgltf_result_invalid_gltf,
+        cgltf_result_invalid_options,
+        cgltf_result_file_not_found,
+        cgltf_result_io_error,
+        cgltf_result_out_of_memory,
+        cgltf_result_legacy_gltf,
+} cgltf_result;
+
+typedef struct cgltf_memory_options
+{
+        void* (*alloc)(void* user, cgltf_size size);
+        void (*free) (void* user, void* ptr);
+        void* user_data;
+} cgltf_memory_options;
+
+typedef struct cgltf_file_options
+{
+        cgltf_result(*read)(const struct cgltf_memory_options* memory_options, const struct cgltf_file_options* file_options, const char* path, cgltf_size* size, void** data);
+        void (*release)(const struct cgltf_memory_options* memory_options, const struct cgltf_file_options* file_options, void* data);
+        void* user_data;
+} cgltf_file_options;
+
+typedef struct cgltf_options
+{
+        cgltf_file_type type; /* invalid == auto detect */
+        cgltf_size json_token_count; /* 0 == auto */
+        cgltf_memory_options memory;
+        cgltf_file_options file;
+} cgltf_options;
+
+typedef enum cgltf_buffer_view_type
+{
+        cgltf_buffer_view_type_invalid,
+        cgltf_buffer_view_type_indices,
+        cgltf_buffer_view_type_vertices,
+} cgltf_buffer_view_type;
+
+typedef enum cgltf_attribute_type
+{
+        cgltf_attribute_type_invalid,
+        cgltf_attribute_type_position,
+        cgltf_attribute_type_normal,
+        cgltf_attribute_type_tangent,
+        cgltf_attribute_type_texcoord,
+        cgltf_attribute_type_color,
+        cgltf_attribute_type_joints,
+        cgltf_attribute_type_weights,
+} cgltf_attribute_type;
+
+typedef enum cgltf_component_type
+{
+        cgltf_component_type_invalid,
+        cgltf_component_type_r_8, /* BYTE */
+        cgltf_component_type_r_8u, /* UNSIGNED_BYTE */
+        cgltf_component_type_r_16, /* SHORT */
+        cgltf_component_type_r_16u, /* UNSIGNED_SHORT */
+        cgltf_component_type_r_32u, /* UNSIGNED_INT */
+        cgltf_component_type_r_32f, /* FLOAT */
+} cgltf_component_type;
+
+typedef enum cgltf_type
+{
+        cgltf_type_invalid,
+        cgltf_type_scalar,
+        cgltf_type_vec2,
+        cgltf_type_vec3,
+        cgltf_type_vec4,
+        cgltf_type_mat2,
+        cgltf_type_mat3,
+        cgltf_type_mat4,
+} cgltf_type;
+
+typedef enum cgltf_primitive_type
+{
+        cgltf_primitive_type_points,
+        cgltf_primitive_type_lines,
+        cgltf_primitive_type_line_loop,
+        cgltf_primitive_type_line_strip,
+        cgltf_primitive_type_triangles,
+        cgltf_primitive_type_triangle_strip,
+        cgltf_primitive_type_triangle_fan,
+} cgltf_primitive_type;
+
+typedef enum cgltf_alpha_mode
+{
+        cgltf_alpha_mode_opaque,
+        cgltf_alpha_mode_mask,
+        cgltf_alpha_mode_blend,
+} cgltf_alpha_mode;
+
+typedef enum cgltf_animation_path_type {
+        cgltf_animation_path_type_invalid,
+        cgltf_animation_path_type_translation,
+        cgltf_animation_path_type_rotation,
+        cgltf_animation_path_type_scale,
+        cgltf_animation_path_type_weights,
+} cgltf_animation_path_type;
+
+typedef enum cgltf_interpolation_type {
+        cgltf_interpolation_type_linear,
+        cgltf_interpolation_type_step,
+        cgltf_interpolation_type_cubic_spline,
+} cgltf_interpolation_type;
+
+typedef enum cgltf_camera_type {
+        cgltf_camera_type_invalid,
+        cgltf_camera_type_perspective,
+        cgltf_camera_type_orthographic,
+} cgltf_camera_type;
+
+typedef enum cgltf_light_type {
+        cgltf_light_type_invalid,
+        cgltf_light_type_directional,
+        cgltf_light_type_point,
+        cgltf_light_type_spot,
+} cgltf_light_type;
+
+typedef struct cgltf_extras {
+        cgltf_size start_offset;
+        cgltf_size end_offset;
+} cgltf_extras;
+
+typedef struct cgltf_extension {
+        char* name;
+        char* data;
+} cgltf_extension;
+
+typedef struct cgltf_buffer
+{
+        cgltf_size size;
+        char* uri;
+        void* data; /* loaded by cgltf_load_buffers */
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_buffer;
+
+typedef struct cgltf_buffer_view
+{
+        cgltf_buffer* buffer;
+        cgltf_size offset;
+        cgltf_size size;
+        cgltf_size stride; /* 0 == automatically determined by accessor */
+        cgltf_buffer_view_type type;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_buffer_view;
+
+typedef struct cgltf_accessor_sparse
+{
+        cgltf_size count;
+        cgltf_buffer_view* indices_buffer_view;
+        cgltf_size indices_byte_offset;
+        cgltf_component_type indices_component_type;
+        cgltf_buffer_view* values_buffer_view;
+        cgltf_size values_byte_offset;
+        cgltf_extras extras;
+        cgltf_extras indices_extras;
+        cgltf_extras values_extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+        cgltf_size indices_extensions_count;
+        cgltf_extension* indices_extensions;
+        cgltf_size values_extensions_count;
+        cgltf_extension* values_extensions;
+} cgltf_accessor_sparse;
+
+typedef struct cgltf_accessor
+{
+        cgltf_component_type component_type;
+        cgltf_bool normalized;
+        cgltf_type type;
+        cgltf_size offset;
+        cgltf_size count;
+        cgltf_size stride;
+        cgltf_buffer_view* buffer_view;
+        cgltf_bool has_min;
+        cgltf_float min[16];
+        cgltf_bool has_max;
+        cgltf_float max[16];
+        cgltf_bool is_sparse;
+        cgltf_accessor_sparse sparse;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_accessor;
+
+typedef struct cgltf_attribute
+{
+        char* name;
+        cgltf_attribute_type type;
+        cgltf_int index;
+        cgltf_accessor* data;
+} cgltf_attribute;
+
+typedef struct cgltf_image
+{
+        char* name;
+        char* uri;
+        cgltf_buffer_view* buffer_view;
+        char* mime_type;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_image;
+
+typedef struct cgltf_sampler
+{
+        cgltf_int mag_filter;
+        cgltf_int min_filter;
+        cgltf_int wrap_s;
+        cgltf_int wrap_t;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_sampler;
+
+typedef struct cgltf_texture
+{
+        char* name;
+        cgltf_image* image;
+        cgltf_sampler* sampler;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_texture;
+
+typedef struct cgltf_texture_transform
+{
+        cgltf_float offset[2];
+        cgltf_float rotation;
+        cgltf_float scale[2];
+        cgltf_int texcoord;
+} cgltf_texture_transform;
+
+typedef struct cgltf_texture_view
+{
+        cgltf_texture* texture;
+        cgltf_int texcoord;
+        cgltf_float scale; /* equivalent to strength for occlusion_texture */
+        cgltf_bool has_transform;
+        cgltf_texture_transform transform;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_texture_view;
+
+typedef struct cgltf_pbr_metallic_roughness
+{
+        cgltf_texture_view base_color_texture;
+        cgltf_texture_view metallic_roughness_texture;
+
+        cgltf_float base_color_factor[4];
+        cgltf_float metallic_factor;
+        cgltf_float roughness_factor;
+
+        cgltf_extras extras;
+} cgltf_pbr_metallic_roughness;
+
+typedef struct cgltf_pbr_specular_glossiness
+{
+        cgltf_texture_view diffuse_texture;
+        cgltf_texture_view specular_glossiness_texture;
+
+        cgltf_float diffuse_factor[4];
+        cgltf_float specular_factor[3];
+        cgltf_float glossiness_factor;
+} cgltf_pbr_specular_glossiness;
+
+typedef struct cgltf_clearcoat
+{
+        cgltf_texture_view clearcoat_texture;
+        cgltf_texture_view clearcoat_roughness_texture;
+        cgltf_texture_view clearcoat_normal_texture;
+
+        cgltf_float clearcoat_factor;
+        cgltf_float clearcoat_roughness_factor;
+} cgltf_clearcoat;
+
+typedef struct cgltf_transmission
+{
+        cgltf_texture_view transmission_texture;
+        cgltf_float transmission_factor;
+} cgltf_transmission;
+
+typedef struct cgltf_ior
+{
+        cgltf_float ior;
+} cgltf_ior;
+
+typedef struct cgltf_specular
+{
+        cgltf_texture_view specular_texture;
+        cgltf_float specular_color_factor[3];
+        cgltf_float specular_factor;
+} cgltf_specular;
+
+typedef struct cgltf_material
+{
+        char* name;
+        cgltf_bool has_pbr_metallic_roughness;
+        cgltf_bool has_pbr_specular_glossiness;
+        cgltf_bool has_clearcoat;
+        cgltf_bool has_transmission;
+        cgltf_bool has_ior;
+        cgltf_bool has_specular;
+        cgltf_pbr_metallic_roughness pbr_metallic_roughness;
+        cgltf_pbr_specular_glossiness pbr_specular_glossiness;
+        cgltf_clearcoat clearcoat;
+        cgltf_ior ior;
+        cgltf_specular specular;
+        cgltf_transmission transmission;
+        cgltf_texture_view normal_texture;
+        cgltf_texture_view occlusion_texture;
+        cgltf_texture_view emissive_texture;
+        cgltf_float emissive_factor[3];
+        cgltf_alpha_mode alpha_mode;
+        cgltf_float alpha_cutoff;
+        cgltf_bool double_sided;
+        cgltf_bool unlit;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_material;
+
+typedef struct cgltf_morph_target {
+        cgltf_attribute* attributes;
+        cgltf_size attributes_count;
+} cgltf_morph_target;
+
+typedef struct cgltf_draco_mesh_compression {
+        cgltf_buffer_view* buffer_view;
+        cgltf_attribute* attributes;
+        cgltf_size attributes_count;
+} cgltf_draco_mesh_compression;
+
+typedef struct cgltf_primitive {
+        cgltf_primitive_type type;
+        cgltf_accessor* indices;
+        cgltf_material* material;
+        cgltf_attribute* attributes;
+        cgltf_size attributes_count;
+        cgltf_morph_target* targets;
+        cgltf_size targets_count;
+        cgltf_extras extras;
+        cgltf_bool has_draco_mesh_compression;
+        cgltf_draco_mesh_compression draco_mesh_compression;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_primitive;
+
+typedef struct cgltf_mesh {
+        char* name;
+        cgltf_primitive* primitives;
+        cgltf_size primitives_count;
+        cgltf_float* weights;
+        cgltf_size weights_count;
+        char** target_names;
+        cgltf_size target_names_count;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_mesh;
+
+typedef struct cgltf_node cgltf_node;
+
+typedef struct cgltf_skin {
+        char* name;
+        cgltf_node** joints;
+        cgltf_size joints_count;
+        cgltf_node* skeleton;
+        cgltf_accessor* inverse_bind_matrices;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_skin;
+
+typedef struct cgltf_camera_perspective {
+        cgltf_float aspect_ratio;
+        cgltf_float yfov;
+        cgltf_float zfar;
+        cgltf_float znear;
+        cgltf_extras extras;
+} cgltf_camera_perspective;
+
+typedef struct cgltf_camera_orthographic {
+        cgltf_float xmag;
+        cgltf_float ymag;
+        cgltf_float zfar;
+        cgltf_float znear;
+        cgltf_extras extras;
+} cgltf_camera_orthographic;
+
+typedef struct cgltf_camera {
+        char* name;
+        cgltf_camera_type type;
+        union {
+                cgltf_camera_perspective perspective;
+                cgltf_camera_orthographic orthographic;
+        } data;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_camera;
+
+typedef struct cgltf_light {
+        char* name;
+        cgltf_float color[3];
+        cgltf_float intensity;
+        cgltf_light_type type;
+        cgltf_float range;
+        cgltf_float spot_inner_cone_angle;
+        cgltf_float spot_outer_cone_angle;
+} cgltf_light;
+
+struct cgltf_node {
+        char* name;
+        cgltf_node* parent;
+        cgltf_node** children;
+        cgltf_size children_count;
+        cgltf_skin* skin;
+        cgltf_mesh* mesh;
+        cgltf_camera* camera;
+        cgltf_light* light;
+        cgltf_float* weights;
+        cgltf_size weights_count;
+        cgltf_bool has_translation;
+        cgltf_bool has_rotation;
+        cgltf_bool has_scale;
+        cgltf_bool has_matrix;
+        cgltf_float translation[3];
+        cgltf_float rotation[4];
+        cgltf_float scale[3];
+        cgltf_float matrix[16];
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+};
+
+typedef struct cgltf_scene {
+        char* name;
+        cgltf_node** nodes;
+        cgltf_size nodes_count;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_scene;
+
+typedef struct cgltf_animation_sampler {
+        cgltf_accessor* input;
+        cgltf_accessor* output;
+        cgltf_interpolation_type interpolation;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_animation_sampler;
+
+typedef struct cgltf_animation_channel {
+        cgltf_animation_sampler* sampler;
+        cgltf_node* target_node;
+        cgltf_animation_path_type target_path;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_animation_channel;
+
+typedef struct cgltf_animation {
+        char* name;
+        cgltf_animation_sampler* samplers;
+        cgltf_size samplers_count;
+        cgltf_animation_channel* channels;
+        cgltf_size channels_count;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_animation;
+
+typedef struct cgltf_asset {
+        char* copyright;
+        char* generator;
+        char* version;
+        char* min_version;
+        cgltf_extras extras;
+        cgltf_size extensions_count;
+        cgltf_extension* extensions;
+} cgltf_asset;
+
+typedef struct cgltf_data
+{
+        cgltf_file_type file_type;
+        void* file_data;
+
+        cgltf_asset asset;
+
+        cgltf_mesh* meshes;
+        cgltf_size meshes_count;
+
+        cgltf_material* materials;
+        cgltf_size materials_count;
+
+        cgltf_accessor* accessors;
+        cgltf_size accessors_count;
+
+        cgltf_buffer_view* buffer_views;
+        cgltf_size buffer_views_count;
+
+        cgltf_buffer* buffers;
+        cgltf_size buffers_count;
+
+        cgltf_image* images;
+        cgltf_size images_count;
+
+        cgltf_texture* textures;
+        cgltf_size textures_count;
+
+        cgltf_sampler* samplers;
+        cgltf_size samplers_count;
+
+        cgltf_skin* skins;
+        cgltf_size skins_count;
+
+        cgltf_camera* cameras;
+        cgltf_size cameras_count;
+
+        cgltf_light* lights;
+        cgltf_size lights_count;
+
+        cgltf_node* nodes;
+        cgltf_size nodes_count;
+
+        cgltf_scene* scenes;
+        cgltf_size scenes_count;
+
+        cgltf_scene* scene;
+
+        cgltf_animation* animations;
+        cgltf_size animations_count;
+
+        cgltf_extras extras;
+
+        cgltf_size data_extensions_count;
+        cgltf_extension* data_extensions;
+
+        char** extensions_used;
+        cgltf_size extensions_used_count;
+
+        char** extensions_required;
+        cgltf_size extensions_required_count;
+
+        const char* json;
+        cgltf_size json_size;
+
+        const void* bin;
+        cgltf_size bin_size;
+
+        cgltf_memory_options memory;
+        cgltf_file_options file;
+} cgltf_data;
+
+cgltf_result cgltf_parse(
+                const cgltf_options* options,
+                const void* data,
+                cgltf_size size,
+                cgltf_data** out_data);
+
+cgltf_result cgltf_parse_file(
+                const cgltf_options* options,
+                const char* path,
+                cgltf_data** out_data);
+
+cgltf_result cgltf_load_buffers(
+                const cgltf_options* options,
+                cgltf_data* data,
+                const char* gltf_path);
+
+cgltf_result cgltf_load_buffer_base64(const cgltf_options* options, cgltf_size size, const char* base64, void** out_data);
+
+void cgltf_decode_uri(char* uri);
+
+cgltf_result cgltf_validate(cgltf_data* data);
+
+void cgltf_free(cgltf_data* data);
+
+void cgltf_node_transform_local(const cgltf_node* node, cgltf_float* out_matrix);
+void cgltf_node_transform_world(const cgltf_node* node, cgltf_float* out_matrix);
+
+cgltf_bool cgltf_accessor_read_float(const cgltf_accessor* accessor, cgltf_size index, cgltf_float* out, cgltf_size element_size);
+cgltf_bool cgltf_accessor_read_uint(const cgltf_accessor* accessor, cgltf_size index, cgltf_uint* out, cgltf_size element_size);
+cgltf_size cgltf_accessor_read_index(const cgltf_accessor* accessor, cgltf_size index);
+
+cgltf_size cgltf_num_components(cgltf_type type);
+
+cgltf_size cgltf_accessor_unpack_floats(const cgltf_accessor* accessor, cgltf_float* out, cgltf_size float_count);
+
+cgltf_result cgltf_copy_extras_json(const cgltf_data* data, const cgltf_extras* extras, char* dest, cgltf_size* dest_size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* #ifndef CGLTF_H_INCLUDED__ */
+
+/*
+ *
+ * Stop now, if you are only interested in the API.
+ * Below, you find the implementation.
+ *
+ */
+
+#if defined(__INTELLISENSE__) || defined(__JETBRAINS_IDE__)
+/* This makes MSVC/CLion intellisense work. */
+#define CGLTF_IMPLEMENTATION
+#endif
+
+#ifdef CGLTF_IMPLEMENTATION
+
+#include <stdint.h> /* For uint8_t, uint32_t */
+#include <string.h> /* For strncpy */
+#include <stdio.h>  /* For fopen */
+#include <limits.h> /* For UINT_MAX etc */
+
+#if !defined(CGLTF_MALLOC) || !defined(CGLTF_FREE) || !defined(CGLTF_ATOI) || !defined(CGLTF_ATOF)
+#include <stdlib.h> /* For malloc, free, atoi, atof */
+#endif
+
+/* JSMN_PARENT_LINKS is necessary to make parsing large structures linear in input size */
+#define JSMN_PARENT_LINKS
+
+/* JSMN_STRICT is necessary to reject invalid JSON documents */
+#define JSMN_STRICT
+
+/*
+ * -- jsmn.h start --
+ * Source: https://github.com/zserge/jsmn
+ * License: MIT
+ */
+typedef enum {
+        JSMN_UNDEFINED = 0,
+        JSMN_OBJECT = 1,
+        JSMN_ARRAY = 2,
+        JSMN_STRING = 3,
+        JSMN_PRIMITIVE = 4
+} jsmntype_t;
+enum jsmnerr {
+        /* Not enough tokens were provided */
+        JSMN_ERROR_NOMEM = -1,
+        /* Invalid character inside JSON string */
+        JSMN_ERROR_INVAL = -2,
+        /* The string is not a full JSON packet, more bytes expected */
+        JSMN_ERROR_PART = -3
+};
+typedef struct {
+        jsmntype_t type;
+        int start;
+        int end;
+        int size;
+#ifdef JSMN_PARENT_LINKS
+        int parent;
+#endif
+} jsmntok_t;
+typedef struct {
+        unsigned int pos; /* offset in the JSON string */
+        unsigned int toknext; /* next token to allocate */
+        int toksuper; /* superior token node, e.g parent object or array */
+} jsmn_parser;
+static void jsmn_init(jsmn_parser *parser);
+static int jsmn_parse(jsmn_parser *parser, const char *js, size_t len, jsmntok_t *tokens, size_t num_tokens);
+/*
+ * -- jsmn.h end --
+ */
+
+
+static const cgltf_size GlbHeaderSize = 12;
+static const cgltf_size GlbChunkHeaderSize = 8;
+static const uint32_t GlbVersion = 2;
+static const uint32_t GlbMagic = 0x46546C67;
+static const uint32_t GlbMagicJsonChunk = 0x4E4F534A;
+static const uint32_t GlbMagicBinChunk = 0x004E4942;
+
+#ifndef CGLTF_MALLOC
+#define CGLTF_MALLOC(size) malloc(size)
+#endif
+#ifndef CGLTF_FREE
+#define CGLTF_FREE(ptr) free(ptr)
+#endif
+#ifndef CGLTF_ATOI
+#define CGLTF_ATOI(str) atoi(str)
+#endif
+#ifndef CGLTF_ATOF
+#define CGLTF_ATOF(str) atof(str)
+#endif
+
+static void* cgltf_default_alloc(void* user, cgltf_size size)
+{
+        (void)user;
+        return CGLTF_MALLOC(size);
+}
+
+static void cgltf_default_free(void* user, void* ptr)
+{
+        (void)user;
+        CGLTF_FREE(ptr);
+}
+
+static void* cgltf_calloc(cgltf_options* options, size_t element_size, cgltf_size count)
+{
+        if (SIZE_MAX / element_size < count)
+        {
+                return NULL;
+        }
+        void* result = options->memory.alloc(options->memory.user_data, element_size * count);
+        if (!result)
+        {
+                return NULL;
+        }
+        memset(result, 0, element_size * count);
+        return result;
+}
+
+static cgltf_result cgltf_default_file_read(const struct cgltf_memory_options* memory_options, const struct cgltf_file_options* file_options, const char* path, cgltf_size* size, void** data)
+{
+        (void)file_options;
+        void* (*memory_alloc)(void*, cgltf_size) = memory_options->alloc ? memory_options->alloc : &cgltf_default_alloc;
+        void (*memory_free)(void*, void*) = memory_options->free ? memory_options->free : &cgltf_default_free;
+
+        FILE* file = fopen(path, "rb");
+        if (!file)
+        {
+                return cgltf_result_file_not_found;
+        }
+
+        cgltf_size file_size = size ? *size : 0;
+
+        if (file_size == 0)
+        {
+                fseek(file, 0, SEEK_END);
+
+                long length = ftell(file);
+                if (length < 0)
+                {
+                        fclose(file);
+                        return cgltf_result_io_error;
+                }
+
+                fseek(file, 0, SEEK_SET);
+                file_size = (cgltf_size)length;
+        }
+
+        char* file_data = (char*)memory_alloc(memory_options->user_data, file_size);
+        if (!file_data)
+        {
+                fclose(file);
+                return cgltf_result_out_of_memory;
+        }
+        
+        cgltf_size read_size = fread(file_data, 1, file_size, file);
+
+        fclose(file);
+
+        if (read_size != file_size)
+        {
+                memory_free(memory_options->user_data, file_data);
+                return cgltf_result_io_error;
+        }
+
+        if (size)
+        {
+                *size = file_size;
+        }
+        if (data)
+        {
+                *data = file_data;
+        }
+
+        return cgltf_result_success;
+}
+
+static void cgltf_default_file_release(const struct cgltf_memory_options* memory_options, const struct cgltf_file_options* file_options, void* data)
+{
+        (void)file_options;
+        void (*memfree)(void*, void*) = memory_options->free ? memory_options->free : &cgltf_default_free;
+        memfree(memory_options->user_data, data);
+}
+
+static cgltf_result cgltf_parse_json(cgltf_options* options, const uint8_t* json_chunk, cgltf_size size, cgltf_data** out_data);
+
+cgltf_result cgltf_parse(const cgltf_options* options, const void* data, cgltf_size size, cgltf_data** out_data)
+{
+        if (size < GlbHeaderSize)
+        {
+                return cgltf_result_data_too_short;
+        }
+
+        if (options == NULL)
+        {
+                return cgltf_result_invalid_options;
+        }
+
+        cgltf_options fixed_options = *options;
+        if (fixed_options.memory.alloc == NULL)
+        {
+                fixed_options.memory.alloc = &cgltf_default_alloc;
+        }
+        if (fixed_options.memory.free == NULL)
+        {
+                fixed_options.memory.free = &cgltf_default_free;
+        }
+
+        uint32_t tmp;
+        // Magic
+        memcpy(&tmp, data, 4);
+        if (tmp != GlbMagic)
+        {
+                if (fixed_options.type == cgltf_file_type_invalid)
+                {
+                        fixed_options.type = cgltf_file_type_gltf;
+                }
+                else if (fixed_options.type == cgltf_file_type_glb)
+                {
+                        return cgltf_result_unknown_format;
+                }
+        }
+
+        if (fixed_options.type == cgltf_file_type_gltf)
+        {
+                cgltf_result json_result = cgltf_parse_json(&fixed_options, (const uint8_t*)data, size, out_data);
+                if (json_result != cgltf_result_success)
+                {
+                        return json_result;
+                }
+
+                (*out_data)->file_type = cgltf_file_type_gltf;
+
+                return cgltf_result_success;
+        }
+
+        const uint8_t* ptr = (const uint8_t*)data;
+        // Version
+        memcpy(&tmp, ptr + 4, 4);
+        uint32_t version = tmp;
+        if (version != GlbVersion)
+        {
+                return version < GlbVersion ? cgltf_result_legacy_gltf : cgltf_result_unknown_format;
+        }
+
+        // Total length
+        memcpy(&tmp, ptr + 8, 4);
+        if (tmp > size)
+        {
+                return cgltf_result_data_too_short;
+        }
+
+        const uint8_t* json_chunk = ptr + GlbHeaderSize;
+
+        if (GlbHeaderSize + GlbChunkHeaderSize > size)
+        {
+                return cgltf_result_data_too_short;
+        }
+
+        // JSON chunk: length
+        uint32_t json_length;
+        memcpy(&json_length, json_chunk, 4);
+        if (GlbHeaderSize + GlbChunkHeaderSize + json_length > size)
+        {
+                return cgltf_result_data_too_short;
+        }
+
+        // JSON chunk: magic
+        memcpy(&tmp, json_chunk + 4, 4);
+        if (tmp != GlbMagicJsonChunk)
+        {
+                return cgltf_result_unknown_format;
+        }
+
+        json_chunk += GlbChunkHeaderSize;
+
+        const void* bin = 0;
+        cgltf_size bin_size = 0;
+
+        if (GlbHeaderSize + GlbChunkHeaderSize + json_length + GlbChunkHeaderSize <= size)
+        {
+                // We can read another chunk
+                const uint8_t* bin_chunk = json_chunk + json_length;
+
+                // Bin chunk: length
+                uint32_t bin_length;
+                memcpy(&bin_length, bin_chunk, 4);
+                if (GlbHeaderSize + GlbChunkHeaderSize + json_length + GlbChunkHeaderSize + bin_length > size)
+                {
+                        return cgltf_result_data_too_short;
+                }
+
+                // Bin chunk: magic
+                memcpy(&tmp, bin_chunk + 4, 4);
+                if (tmp != GlbMagicBinChunk)
+                {
+                        return cgltf_result_unknown_format;
+                }
+
+                bin_chunk += GlbChunkHeaderSize;
+
+                bin = bin_chunk;
+                bin_size = bin_length;
+        }
+
+        cgltf_result json_result = cgltf_parse_json(&fixed_options, json_chunk, json_length, out_data);
+        if (json_result != cgltf_result_success)
+        {
+                return json_result;
+        }
+
+        (*out_data)->file_type = cgltf_file_type_glb;
+        (*out_data)->bin = bin;
+        (*out_data)->bin_size = bin_size;
+
+        return cgltf_result_success;
+}
+
+cgltf_result cgltf_parse_file(const cgltf_options* options, const char* path, cgltf_data** out_data)
+{
+        if (options == NULL)
+        {
+                return cgltf_result_invalid_options;
+        }
+
+        void (*memory_free)(void*, void*) = options->memory.free ? options->memory.free : &cgltf_default_free;
+        cgltf_result (*file_read)(const struct cgltf_memory_options*, const struct cgltf_file_options*, const char*, cgltf_size*, void**) = options->file.read ? options->file.read : &cgltf_default_file_read;
+
+        void* file_data = NULL;
+        cgltf_size file_size = 0;
+        cgltf_result result = file_read(&options->memory, &options->file, path, &file_size, &file_data);
+        if (result != cgltf_result_success)
+        {
+                return result;
+        }
+
+        result = cgltf_parse(options, file_data, file_size, out_data);
+
+        if (result != cgltf_result_success)
+        {
+                memory_free(options->memory.user_data, file_data);
+                return result;
+        }
+
+        (*out_data)->file_data = file_data;
+
+        return cgltf_result_success;
+}
+
+static void cgltf_combine_paths(char* path, const char* base, const char* uri)
+{
+        const char* s0 = strrchr(base, '/');
+        const char* s1 = strrchr(base, '\\');
+        const char* slash = s0 ? (s1 && s1 > s0 ? s1 : s0) : s1;
+
+        if (slash)
+        {
+                size_t prefix = slash - base + 1;
+
+                strncpy(path, base, prefix);
+                strcpy(path + prefix, uri);
+        }
+        else
+        {
+                strcpy(path, uri);
+        }
+}
+
+static cgltf_result cgltf_load_buffer_file(const cgltf_options* options, cgltf_size size, const char* uri, const char* gltf_path, void** out_data)
+{
+        void* (*memory_alloc)(void*, cgltf_size) = options->memory.alloc ? options->memory.alloc : &cgltf_default_alloc;
+        void (*memory_free)(void*, void*) = options->memory.free ? options->memory.free : &cgltf_default_free;
+        cgltf_result (*file_read)(const struct cgltf_memory_options*, const struct cgltf_file_options*, const char*, cgltf_size*, void**) = options->file.read ? options->file.read : &cgltf_default_file_read;
+
+        char* path = (char*)memory_alloc(options->memory.user_data, strlen(uri) + strlen(gltf_path) + 1);
+        if (!path)
+        {
+                return cgltf_result_out_of_memory;
+        }
+
+        cgltf_combine_paths(path, gltf_path, uri);
+
+        // after combining, the tail of the resulting path is a uri; decode_uri converts it into path
+        cgltf_decode_uri(path + strlen(path) - strlen(uri));
+
+        void* file_data = NULL;
+        cgltf_result result = file_read(&options->memory, &options->file, path, &size, &file_data);
+
+        memory_free(options->memory.user_data, path);
+
+        *out_data = (result == cgltf_result_success) ? file_data : NULL;
+
+        return result;
+}
+
+cgltf_result cgltf_load_buffer_base64(const cgltf_options* options, cgltf_size size, const char* base64, void** out_data)
+{
+        void* (*memory_alloc)(void*, cgltf_size) = options->memory.alloc ? options->memory.alloc : &cgltf_default_alloc;
+        void (*memory_free)(void*, void*) = options->memory.free ? options->memory.free : &cgltf_default_free;
+
+        unsigned char* data = (unsigned char*)memory_alloc(options->memory.user_data, size);
+        if (!data)
+        {
+                return cgltf_result_out_of_memory;
+        }
+
+        unsigned int buffer = 0;
+        unsigned int buffer_bits = 0;
+
+        for (cgltf_size i = 0; i < size; ++i)
+        {
+                while (buffer_bits < 8)
+                {
+                        char ch = *base64++;
+
+                        int index =
+                                (unsigned)(ch - 'A') < 26 ? (ch - 'A') :
+                                (unsigned)(ch - 'a') < 26 ? (ch - 'a') + 26 :
+                                (unsigned)(ch - '0') < 10 ? (ch - '0') + 52 :
+                                ch == '+' ? 62 :
+                                ch == '/' ? 63 :
+                                -1;
+
+                        if (index < 0)
+                        {
+                                memory_free(options->memory.user_data, data);
+                                return cgltf_result_io_error;
+                        }
+
+                        buffer = (buffer << 6) | index;
+                        buffer_bits += 6;
+                }
+
+                data[i] = (unsigned char)(buffer >> (buffer_bits - 8));
+                buffer_bits -= 8;
+        }
+
+        *out_data = data;
+
+        return cgltf_result_success;
+}
+
+static int cgltf_unhex(char ch)
+{
+        return
+                (unsigned)(ch - '0') < 10 ? (ch - '0') :
+                (unsigned)(ch - 'A') < 6 ? (ch - 'A') + 10 :
+                (unsigned)(ch - 'a') < 6 ? (ch - 'a') + 10 :
+                -1;
+}
+
+void cgltf_decode_uri(char* uri)
+{
+        char* write = uri;
+        char* i = uri;
+
+        while (*i)
+        {
+                if (*i == '%')
+                {
+                        int ch1 = cgltf_unhex(i[1]);
+
+                        if (ch1 >= 0)
+                        {
+                                int ch2 = cgltf_unhex(i[2]);
+
+                                if (ch2 >= 0)
+                                {
+                                        *write++ = (char)(ch1 * 16 + ch2);
+                                        i += 3;
+                                        continue;
+                                }
+                        }
+                }
+
+                *write++ = *i++;
+        }
+
+        *write = 0;
+}
+
+cgltf_result cgltf_load_buffers(const cgltf_options* options, cgltf_data* data, const char* gltf_path)
+{
+        if (options == NULL)
+        {
+                return cgltf_result_invalid_options;
+        }
+
+        if (data->buffers_count && data->buffers[0].data == NULL && data->buffers[0].uri == NULL && data->bin)
+        {
+                if (data->bin_size < data->buffers[0].size)
+                {
+                        return cgltf_result_data_too_short;
+                }
+
+                data->buffers[0].data = (void*)data->bin;
+        }
+
+        for (cgltf_size i = 0; i < data->buffers_count; ++i)
+        {
+                if (data->buffers[i].data)
+                {
+                        continue;
+                }
+
+                const char* uri = data->buffers[i].uri;
+
+                if (uri == NULL)
+                {
+                        continue;
+                }
+
+                if (strncmp(uri, "data:", 5) == 0)
+                {
+                        const char* comma = strchr(uri, ',');
+
+                        if (comma && comma - uri >= 7 && strncmp(comma - 7, ";base64", 7) == 0)
+                        {
+                                cgltf_result res = cgltf_load_buffer_base64(options, data->buffers[i].size, comma + 1, &data->buffers[i].data);
+
+                                if (res != cgltf_result_success)
+                                {
+                                        return res;
+                                }
+                        }
+                        else
+                        {
+                                return cgltf_result_unknown_format;
+                        }
+                }
+                else if (strstr(uri, "://") == NULL && gltf_path)
+                {
+                        cgltf_result res = cgltf_load_buffer_file(options, data->buffers[i].size, uri, gltf_path, &data->buffers[i].data);
+
+                        if (res != cgltf_result_success)
+                        {
+                                return res;
+                        }
+                }
+                else
+                {
+                        return cgltf_result_unknown_format;
+                }
+        }
+
+        return cgltf_result_success;
+}
+
+static cgltf_size cgltf_calc_size(cgltf_type type, cgltf_component_type component_type);
+
+static cgltf_size cgltf_calc_index_bound(cgltf_buffer_view* buffer_view, cgltf_size offset, cgltf_component_type component_type, cgltf_size count)
+{
+        char* data = (char*)buffer_view->buffer->data + offset + buffer_view->offset;
+        cgltf_size bound = 0;
+
+        switch (component_type)
+        {
+        case cgltf_component_type_r_8u:
+                for (size_t i = 0; i < count; ++i)
+                {
+                        cgltf_size v = ((unsigned char*)data)[i];
+                        bound = bound > v ? bound : v;
+                }
+                break;
+
+        case cgltf_component_type_r_16u:
+                for (size_t i = 0; i < count; ++i)
+                {
+                        cgltf_size v = ((unsigned short*)data)[i];
+                        bound = bound > v ? bound : v;
+                }
+                break;
+
+        case cgltf_component_type_r_32u:
+                for (size_t i = 0; i < count; ++i)
+                {
+                        cgltf_size v = ((unsigned int*)data)[i];
+                        bound = bound > v ? bound : v;
+                }
+                break;
+
+        default:
+                ;
+        }
+
+        return bound;
+}
+
+cgltf_result cgltf_validate(cgltf_data* data)
+{
+        for (cgltf_size i = 0; i < data->accessors_count; ++i)
+        {
+                cgltf_accessor* accessor = &data->accessors[i];
+
+                cgltf_size element_size = cgltf_calc_size(accessor->type, accessor->component_type);
+
+                if (accessor->buffer_view)
+                {
+                        cgltf_size req_size = accessor->offset + accessor->stride * (accessor->count - 1) + element_size;
+
+                        if (accessor->buffer_view->size < req_size)
+                        {
+                                return cgltf_result_data_too_short;
+                        }
+                }
+
+                if (accessor->is_sparse)
+                {
+                        cgltf_accessor_sparse* sparse = &accessor->sparse;
+
+                        cgltf_size indices_component_size = cgltf_calc_size(cgltf_type_scalar, sparse->indices_component_type);
+                        cgltf_size indices_req_size = sparse->indices_byte_offset + indices_component_size * sparse->count;
+                        cgltf_size values_req_size = sparse->values_byte_offset + element_size * sparse->count;
+
+                        if (sparse->indices_buffer_view->size < indices_req_size ||
+                                sparse->values_buffer_view->size < values_req_size)
+                        {
+                                return cgltf_result_data_too_short;
+                        }
+
+                        if (sparse->indices_component_type != cgltf_component_type_r_8u &&
+                                sparse->indices_component_type != cgltf_component_type_r_16u &&
+                                sparse->indices_component_type != cgltf_component_type_r_32u)
+                        {
+                                return cgltf_result_invalid_gltf;
+                        }
+
+                        if (sparse->indices_buffer_view->buffer->data)
+                        {
+                                cgltf_size index_bound = cgltf_calc_index_bound(sparse->indices_buffer_view, sparse->indices_byte_offset, sparse->indices_component_type, sparse->count);
+
+                                if (index_bound >= accessor->count)
+                                {
+                                        return cgltf_result_data_too_short;
+                                }
+                        }
+                }
+        }
+
+        for (cgltf_size i = 0; i < data->buffer_views_count; ++i)
+        {
+                cgltf_size req_size = data->buffer_views[i].offset + data->buffer_views[i].size;
+
+                if (data->buffer_views[i].buffer && data->buffer_views[i].buffer->size < req_size)
+                {
+                        return cgltf_result_data_too_short;
+                }
+        }
+
+        for (cgltf_size i = 0; i < data->meshes_count; ++i)
+        {
+                if (data->meshes[i].weights)
+                {
+                        if (data->meshes[i].primitives_count && data->meshes[i].primitives[0].targets_count != data->meshes[i].weights_count)
+                        {
+                                return cgltf_result_invalid_gltf;
+                        }
+                }
+
+                if (data->meshes[i].target_names)
+                {
+                        if (data->meshes[i].primitives_count && data->meshes[i].primitives[0].targets_count != data->meshes[i].target_names_count)
+                        {
+                                return cgltf_result_invalid_gltf;
+                        }
+                }
+
+                for (cgltf_size j = 0; j < data->meshes[i].primitives_count; ++j)
+                {
+                        if (data->meshes[i].primitives[j].targets_count != data->meshes[i].primitives[0].targets_count)
+                        {
+                                return cgltf_result_invalid_gltf;
+                        }
+
+                        if (data->meshes[i].primitives[j].attributes_count)
+                        {
+                                cgltf_accessor* first = data->meshes[i].primitives[j].attributes[0].data;
+
+                                for (cgltf_size k = 0; k < data->meshes[i].primitives[j].attributes_count; ++k)
+                                {
+                                        if (data->meshes[i].primitives[j].attributes[k].data->count != first->count)
+                                        {
+                                                return cgltf_result_invalid_gltf;
+                                        }
+                                }
+
+                                for (cgltf_size k = 0; k < data->meshes[i].primitives[j].targets_count; ++k)
+                                {
+                                        for (cgltf_size m = 0; m < data->meshes[i].primitives[j].targets[k].attributes_count; ++m)
+                                        {
+                                                if (data->meshes[i].primitives[j].targets[k].attributes[m].data->count != first->count)
+                                                {
+                                                        return cgltf_result_invalid_gltf;
+                                                }
+                                        }
+                                }
+
+                                cgltf_accessor* indices = data->meshes[i].primitives[j].indices;
+
+                                if (indices &&
+                                        indices->component_type != cgltf_component_type_r_8u &&
+                                        indices->component_type != cgltf_component_type_r_16u &&
+                                        indices->component_type != cgltf_component_type_r_32u)
+                                {
+                                        return cgltf_result_invalid_gltf;
+                                }
+
+                                if (indices && indices->buffer_view && indices->buffer_view->buffer->data)
+                                {
+                                        cgltf_size index_bound = cgltf_calc_index_bound(indices->buffer_view, indices->offset, indices->component_type, indices->count);
+
+                                        if (index_bound >= first->count)
+                                        {
+                                                return cgltf_result_data_too_short;
+                                        }
+                                }
+                        }
+                }
+        }
+
+        for (cgltf_size i = 0; i < data->nodes_count; ++i)
+        {
+                if (data->nodes[i].weights && data->nodes[i].mesh)
+                {
+                        if (data->nodes[i].mesh->primitives_count && data->nodes[i].mesh->primitives[0].targets_count != data->nodes[i].weights_count)
+                        {
+                                return cgltf_result_invalid_gltf;
+                        }
+                }
+        }
+
+        for (cgltf_size i = 0; i < data->nodes_count; ++i)
+        {
+                cgltf_node* p1 = data->nodes[i].parent;
+                cgltf_node* p2 = p1 ? p1->parent : NULL;
+
+                while (p1 && p2)
+                {
+                        if (p1 == p2)
+                        {
+                                return cgltf_result_invalid_gltf;
+                        }
+
+                        p1 = p1->parent;
+                        p2 = p2->parent ? p2->parent->parent : NULL;
+                }
+        }
+
+        for (cgltf_size i = 0; i < data->scenes_count; ++i)
+        {
+                for (cgltf_size j = 0; j < data->scenes[i].nodes_count; ++j)
+                {
+                        if (data->scenes[i].nodes[j]->parent)
+                        {
+                                return cgltf_result_invalid_gltf;
+                        }
+                }
+        }
+
+        for (cgltf_size i = 0; i < data->animations_count; ++i)
+        {
+                for (cgltf_size j = 0; j < data->animations[i].channels_count; ++j)
+                {
+                        cgltf_animation_channel* channel = &data->animations[i].channels[j];
+
+                        if (!channel->target_node)
+                        {
+                                continue;
+                        }
+
+                        cgltf_size components = 1;
+
+                        if (channel->target_path == cgltf_animation_path_type_weights)
+                        {
+                                if (!channel->target_node->mesh || !channel->target_node->mesh->primitives_count)
+                                {
+                                        return cgltf_result_invalid_gltf;
+                                }
+
+                                components = channel->target_node->mesh->primitives[0].targets_count;
+                        }
+
+                        cgltf_size values = channel->sampler->interpolation == cgltf_interpolation_type_cubic_spline ? 3 : 1;
+
+                        if (channel->sampler->input->count * components * values != channel->sampler->output->count)
+                        {
+                                return cgltf_result_data_too_short;
+                        }
+                }
+        }
+
+        return cgltf_result_success;
+}
+
+cgltf_result cgltf_copy_extras_json(const cgltf_data* data, const cgltf_extras* extras, char* dest, cgltf_size* dest_size)
+{
+        cgltf_size json_size = extras->end_offset - extras->start_offset;
+
+        if (!dest)
+        {
+                if (dest_size)
+                {
+                        *dest_size = json_size + 1;
+                        return cgltf_result_success;
+                }
+                return cgltf_result_invalid_options;
+        }
+
+        if (*dest_size + 1 < json_size)
+        {
+                strncpy(dest, data->json + extras->start_offset, *dest_size - 1);
+                dest[*dest_size - 1] = 0;
+        }
+        else
+        {
+                strncpy(dest, data->json + extras->start_offset, json_size);
+                dest[json_size] = 0;
+        }
+
+        return cgltf_result_success;
+}
+
+void cgltf_free_extensions(cgltf_data* data, cgltf_extension* extensions, cgltf_size extensions_count)
+{
+        for (cgltf_size i = 0; i < extensions_count; ++i)
+        {
+                data->memory.free(data->memory.user_data, extensions[i].name);
+                data->memory.free(data->memory.user_data, extensions[i].data);
+        }
+        data->memory.free(data->memory.user_data, extensions);
+}
+
+void cgltf_free(cgltf_data* data)
+{
+        if (!data)
+        {
+                return;
+        }
+
+        void (*file_release)(const struct cgltf_memory_options*, const struct cgltf_file_options*, void* data) = data->file.release ? data->file.release : cgltf_default_file_release;
+
+        data->memory.free(data->memory.user_data, data->asset.copyright);
+        data->memory.free(data->memory.user_data, data->asset.generator);
+        data->memory.free(data->memory.user_data, data->asset.version);
+        data->memory.free(data->memory.user_data, data->asset.min_version);
+
+        cgltf_free_extensions(data, data->asset.extensions, data->asset.extensions_count);
+
+        for (cgltf_size i = 0; i < data->accessors_count; ++i)
+        {
+                if(data->accessors[i].is_sparse)
+                {
+                        cgltf_free_extensions(data, data->accessors[i].sparse.extensions, data->accessors[i].sparse.extensions_count);
+                        cgltf_free_extensions(data, data->accessors[i].sparse.indices_extensions, data->accessors[i].sparse.indices_extensions_count);
+                        cgltf_free_extensions(data, data->accessors[i].sparse.values_extensions, data->accessors[i].sparse.values_extensions_count);
+                }
+                cgltf_free_extensions(data, data->accessors[i].extensions, data->accessors[i].extensions_count);
+        }
+        data->memory.free(data->memory.user_data, data->accessors);
+
+        for (cgltf_size i = 0; i < data->buffer_views_count; ++i)
+        {
+                cgltf_free_extensions(data, data->buffer_views[i].extensions, data->buffer_views[i].extensions_count);
+        }
+        data->memory.free(data->memory.user_data, data->buffer_views);
+
+        for (cgltf_size i = 0; i < data->buffers_count; ++i)
+        {
+                if (data->buffers[i].data != data->bin)
+                {
+                        file_release(&data->memory, &data->file, data->buffers[i].data);
+                }
+                data->memory.free(data->memory.user_data, data->buffers[i].uri);
+
+                cgltf_free_extensions(data, data->buffers[i].extensions, data->buffers[i].extensions_count);
+        }
+
+        data->memory.free(data->memory.user_data, data->buffers);
+
+        for (cgltf_size i = 0; i < data->meshes_count; ++i)
+        {
+                data->memory.free(data->memory.user_data, data->meshes[i].name);
+
+                for (cgltf_size j = 0; j < data->meshes[i].primitives_count; ++j)
+                {
+                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].attributes_count; ++k)
+                        {
+                                data->memory.free(data->memory.user_data, data->meshes[i].primitives[j].attributes[k].name);
+                        }
+
+                        data->memory.free(data->memory.user_data, data->meshes[i].primitives[j].attributes);
+
+                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].targets_count; ++k)
+                        {
+                                for (cgltf_size m = 0; m < data->meshes[i].primitives[j].targets[k].attributes_count; ++m)
+                                {
+                                        data->memory.free(data->memory.user_data, data->meshes[i].primitives[j].targets[k].attributes[m].name);
+                                }
+
+                                data->memory.free(data->memory.user_data, data->meshes[i].primitives[j].targets[k].attributes);
+                        }
+
+                        data->memory.free(data->memory.user_data, data->meshes[i].primitives[j].targets);
+
+                        if (data->meshes[i].primitives[j].has_draco_mesh_compression)
+                        {
+                                for (cgltf_size k = 0; k < data->meshes[i].primitives[j].draco_mesh_compression.attributes_count; ++k)
+                                {
+                                        data->memory.free(data->memory.user_data, data->meshes[i].primitives[j].draco_mesh_compression.attributes[k].name);
+                                }
+
+                                data->memory.free(data->memory.user_data, data->meshes[i].primitives[j].draco_mesh_compression.attributes);
+                        }
+
+                        cgltf_free_extensions(data, data->meshes[i].primitives[j].extensions, data->meshes[i].primitives[j].extensions_count);
+                }
+
+                data->memory.free(data->memory.user_data, data->meshes[i].primitives);
+                data->memory.free(data->memory.user_data, data->meshes[i].weights);
+
+                for (cgltf_size j = 0; j < data->meshes[i].target_names_count; ++j)
+                {
+                        data->memory.free(data->memory.user_data, data->meshes[i].target_names[j]);
+                }
+
+                cgltf_free_extensions(data, data->meshes[i].extensions, data->meshes[i].extensions_count);
+
+                data->memory.free(data->memory.user_data, data->meshes[i].target_names);
+        }
+
+        data->memory.free(data->memory.user_data, data->meshes);
+
+        for (cgltf_size i = 0; i < data->materials_count; ++i)
+        {
+                data->memory.free(data->memory.user_data, data->materials[i].name);
+
+                if(data->materials[i].has_pbr_metallic_roughness)
+                {
+                        cgltf_free_extensions(data, data->materials[i].pbr_metallic_roughness.metallic_roughness_texture.extensions, data->materials[i].pbr_metallic_roughness.metallic_roughness_texture.extensions_count);
+                        cgltf_free_extensions(data, data->materials[i].pbr_metallic_roughness.base_color_texture.extensions, data->materials[i].pbr_metallic_roughness.base_color_texture.extensions_count);
+                }
+                if(data->materials[i].has_pbr_specular_glossiness)
+                {
+                        cgltf_free_extensions(data, data->materials[i].pbr_specular_glossiness.diffuse_texture.extensions, data->materials[i].pbr_specular_glossiness.diffuse_texture.extensions_count);
+                        cgltf_free_extensions(data, data->materials[i].pbr_specular_glossiness.specular_glossiness_texture.extensions, data->materials[i].pbr_specular_glossiness.specular_glossiness_texture.extensions_count);
+                }
+                if(data->materials[i].has_clearcoat)
+                {
+                        cgltf_free_extensions(data, data->materials[i].clearcoat.clearcoat_texture.extensions, data->materials[i].clearcoat.clearcoat_texture.extensions_count);
+                        cgltf_free_extensions(data, data->materials[i].clearcoat.clearcoat_roughness_texture.extensions, data->materials[i].clearcoat.clearcoat_roughness_texture.extensions_count);
+                        cgltf_free_extensions(data, data->materials[i].clearcoat.clearcoat_normal_texture.extensions, data->materials[i].clearcoat.clearcoat_normal_texture.extensions_count);
+                }
+                if(data->materials[i].has_specular)
+                {
+                        cgltf_free_extensions(data, data->materials[i].specular.specular_texture.extensions, data->materials[i].specular.specular_texture.extensions_count);
+                }
+                if(data->materials[i].has_transmission)
+                {
+                        cgltf_free_extensions(data, data->materials[i].transmission.transmission_texture.extensions, data->materials[i].transmission.transmission_texture.extensions_count);
+                }
+
+                cgltf_free_extensions(data, data->materials[i].normal_texture.extensions, data->materials[i].normal_texture.extensions_count);
+                cgltf_free_extensions(data, data->materials[i].occlusion_texture.extensions, data->materials[i].occlusion_texture.extensions_count);
+                cgltf_free_extensions(data, data->materials[i].emissive_texture.extensions, data->materials[i].emissive_texture.extensions_count);
+
+                cgltf_free_extensions(data, data->materials[i].extensions, data->materials[i].extensions_count);
+        }
+
+        data->memory.free(data->memory.user_data, data->materials);
+
+        for (cgltf_size i = 0; i < data->images_count; ++i) 
+        {
+                data->memory.free(data->memory.user_data, data->images[i].name);
+                data->memory.free(data->memory.user_data, data->images[i].uri);
+                data->memory.free(data->memory.user_data, data->images[i].mime_type);
+
+                cgltf_free_extensions(data, data->images[i].extensions, data->images[i].extensions_count);
+        }
+
+        data->memory.free(data->memory.user_data, data->images);
+
+        for (cgltf_size i = 0; i < data->textures_count; ++i)
+        {
+                data->memory.free(data->memory.user_data, data->textures[i].name);
+                cgltf_free_extensions(data, data->textures[i].extensions, data->textures[i].extensions_count);
+        }
+
+        data->memory.free(data->memory.user_data, data->textures);
+
+        for (cgltf_size i = 0; i < data->samplers_count; ++i)
+        {
+                cgltf_free_extensions(data, data->samplers[i].extensions, data->samplers[i].extensions_count);
+        }
+
+        data->memory.free(data->memory.user_data, data->samplers);
+
+        for (cgltf_size i = 0; i < data->skins_count; ++i)
+        {
+                data->memory.free(data->memory.user_data, data->skins[i].name);
+                data->memory.free(data->memory.user_data, data->skins[i].joints);
+
+                cgltf_free_extensions(data, data->skins[i].extensions, data->skins[i].extensions_count);
+        }
+
+        data->memory.free(data->memory.user_data, data->skins);
+
+        for (cgltf_size i = 0; i < data->cameras_count; ++i)
+        {
+                data->memory.free(data->memory.user_data, data->cameras[i].name);
+                cgltf_free_extensions(data, data->cameras[i].extensions, data->cameras[i].extensions_count);
+        }
+
+        data->memory.free(data->memory.user_data, data->cameras);
+
+        for (cgltf_size i = 0; i < data->lights_count; ++i)
+        {
+                data->memory.free(data->memory.user_data, data->lights[i].name);
+        }
+
+        data->memory.free(data->memory.user_data, data->lights);
+
+        for (cgltf_size i = 0; i < data->nodes_count; ++i)
+        {
+                data->memory.free(data->memory.user_data, data->nodes[i].name);
+                data->memory.free(data->memory.user_data, data->nodes[i].children);
+                data->memory.free(data->memory.user_data, data->nodes[i].weights);
+                cgltf_free_extensions(data, data->nodes[i].extensions, data->nodes[i].extensions_count);
+        }
+
+        data->memory.free(data->memory.user_data, data->nodes);
+
+        for (cgltf_size i = 0; i < data->scenes_count; ++i)
+        {
+                data->memory.free(data->memory.user_data, data->scenes[i].name);
+                data->memory.free(data->memory.user_data, data->scenes[i].nodes);
+
+                cgltf_free_extensions(data, data->scenes[i].extensions, data->scenes[i].extensions_count);
+        }
+
+        data->memory.free(data->memory.user_data, data->scenes);
+
+        for (cgltf_size i = 0; i < data->animations_count; ++i)
+        {
+                data->memory.free(data->memory.user_data, data->animations[i].name);
+                for (cgltf_size j = 0; j <  data->animations[i].samplers_count; ++j)
+                {
+                        cgltf_free_extensions(data, data->animations[i].samplers[j].extensions, data->animations[i].samplers[j].extensions_count);
+                }
+                data->memory.free(data->memory.user_data, data->animations[i].samplers);
+
+                for (cgltf_size j = 0; j <  data->animations[i].channels_count; ++j)
+                {
+                        cgltf_free_extensions(data, data->animations[i].channels[j].extensions, data->animations[i].channels[j].extensions_count);
+                }
+                data->memory.free(data->memory.user_data, data->animations[i].channels);
+
+                cgltf_free_extensions(data, data->animations[i].extensions, data->animations[i].extensions_count);
+        }
+
+        data->memory.free(data->memory.user_data, data->animations);
+
+        cgltf_free_extensions(data, data->data_extensions, data->data_extensions_count);
+
+        for (cgltf_size i = 0; i < data->extensions_used_count; ++i)
+        {
+                data->memory.free(data->memory.user_data, data->extensions_used[i]);
+        }
+
+        data->memory.free(data->memory.user_data, data->extensions_used);
+
+        for (cgltf_size i = 0; i < data->extensions_required_count; ++i)
+        {
+                data->memory.free(data->memory.user_data, data->extensions_required[i]);
+        }
+
+        data->memory.free(data->memory.user_data, data->extensions_required);
+
+        file_release(&data->memory, &data->file, data->file_data);
+
+        data->memory.free(data->memory.user_data, data);
+}
+
+void cgltf_node_transform_local(const cgltf_node* node, cgltf_float* out_matrix)
+{
+        cgltf_float* lm = out_matrix;
+
+        if (node->has_matrix)
+        {
+                memcpy(lm, node->matrix, sizeof(float) * 16);
+        }
+        else
+        {
+                float tx = node->translation[0];
+                float ty = node->translation[1];
+                float tz = node->translation[2];
+
+                float qx = node->rotation[0];
+                float qy = node->rotation[1];
+                float qz = node->rotation[2];
+                float qw = node->rotation[3];
+
+                float sx = node->scale[0];
+                float sy = node->scale[1];
+                float sz = node->scale[2];
+
+                lm[0] = (1 - 2 * qy*qy - 2 * qz*qz) * sx;
+                lm[1] = (2 * qx*qy + 2 * qz*qw) * sx;
+                lm[2] = (2 * qx*qz - 2 * qy*qw) * sx;
+                lm[3] = 0.f;
+
+                lm[4] = (2 * qx*qy - 2 * qz*qw) * sy;
+                lm[5] = (1 - 2 * qx*qx - 2 * qz*qz) * sy;
+                lm[6] = (2 * qy*qz + 2 * qx*qw) * sy;
+                lm[7] = 0.f;
+
+                lm[8] = (2 * qx*qz + 2 * qy*qw) * sz;
+                lm[9] = (2 * qy*qz - 2 * qx*qw) * sz;
+                lm[10] = (1 - 2 * qx*qx - 2 * qy*qy) * sz;
+                lm[11] = 0.f;
+
+                lm[12] = tx;
+                lm[13] = ty;
+                lm[14] = tz;
+                lm[15] = 1.f;
+        }
+}
+
+void cgltf_node_transform_world(const cgltf_node* node, cgltf_float* out_matrix)
+{
+        cgltf_float* lm = out_matrix;
+        cgltf_node_transform_local(node, lm);
+
+        const cgltf_node* parent = node->parent;
+
+        while (parent)
+        {
+                float pm[16];
+                cgltf_node_transform_local(parent, pm);
+
+                for (int i = 0; i < 4; ++i)
+                {
+                        float l0 = lm[i * 4 + 0];
+                        float l1 = lm[i * 4 + 1];
+                        float l2 = lm[i * 4 + 2];
+
+                        float r0 = l0 * pm[0] + l1 * pm[4] + l2 * pm[8];
+                        float r1 = l0 * pm[1] + l1 * pm[5] + l2 * pm[9];
+                        float r2 = l0 * pm[2] + l1 * pm[6] + l2 * pm[10];
+
+                        lm[i * 4 + 0] = r0;
+                        lm[i * 4 + 1] = r1;
+                        lm[i * 4 + 2] = r2;
+                }
+
+                lm[12] += pm[12];
+                lm[13] += pm[13];
+                lm[14] += pm[14];
+
+                parent = parent->parent;
+        }
+}
+
+static cgltf_size cgltf_component_read_index(const void* in, cgltf_component_type component_type)
+{
+        switch (component_type)
+        {
+                case cgltf_component_type_r_16:
+                        return *((const int16_t*) in);
+                case cgltf_component_type_r_16u:
+                        return *((const uint16_t*) in);
+                case cgltf_component_type_r_32u:
+                        return *((const uint32_t*) in);
+                case cgltf_component_type_r_32f:
+                        return (cgltf_size)*((const float*) in);
+                case cgltf_component_type_r_8:
+                        return *((const int8_t*) in);
+                case cgltf_component_type_r_8u:
+                        return *((const uint8_t*) in);
+                default:
+                        return 0;
+        }
+}
+
+static cgltf_float cgltf_component_read_float(const void* in, cgltf_component_type component_type, cgltf_bool normalized)
+{
+        if (component_type == cgltf_component_type_r_32f)
+        {
+                return *((const float*) in);
+        }
+
+        if (normalized)
+        {
+                switch (component_type)
+                {
+                        // note: glTF spec doesn't currently define normalized conversions for 32-bit integers
+                        case cgltf_component_type_r_16:
+                                return *((const int16_t*) in) / (cgltf_float)32767;
+                        case cgltf_component_type_r_16u:
+                                return *((const uint16_t*) in) / (cgltf_float)65535;
+                        case cgltf_component_type_r_8:
+                                return *((const int8_t*) in) / (cgltf_float)127;
+                        case cgltf_component_type_r_8u:
+                                return *((const uint8_t*) in) / (cgltf_float)255;
+                        default:
+                                return 0;
+                }
+        }
+
+        return (cgltf_float)cgltf_component_read_index(in, component_type);
+}
+
+static cgltf_size cgltf_component_size(cgltf_component_type component_type);
+
+static cgltf_bool cgltf_element_read_float(const uint8_t* element, cgltf_type type, cgltf_component_type component_type, cgltf_bool normalized, cgltf_float* out, cgltf_size element_size)
+{
+        cgltf_size num_components = cgltf_num_components(type);
+
+        if (element_size < num_components) {
+                return 0;
+        }
+
+        // There are three special cases for component extraction, see #data-alignment in the 2.0 spec.
+
+        cgltf_size component_size = cgltf_component_size(component_type);
+
+        if (type == cgltf_type_mat2 && component_size == 1)
+        {
+                out[0] = cgltf_component_read_float(element, component_type, normalized);
+                out[1] = cgltf_component_read_float(element + 1, component_type, normalized);
+                out[2] = cgltf_component_read_float(element + 4, component_type, normalized);
+                out[3] = cgltf_component_read_float(element + 5, component_type, normalized);
+                return 1;
+        }
+
+        if (type == cgltf_type_mat3 && component_size == 1)
+        {
+                out[0] = cgltf_component_read_float(element, component_type, normalized);
+                out[1] = cgltf_component_read_float(element + 1, component_type, normalized);
+                out[2] = cgltf_component_read_float(element + 2, component_type, normalized);
+                out[3] = cgltf_component_read_float(element + 4, component_type, normalized);
+                out[4] = cgltf_component_read_float(element + 5, component_type, normalized);
+                out[5] = cgltf_component_read_float(element + 6, component_type, normalized);
+                out[6] = cgltf_component_read_float(element + 8, component_type, normalized);
+                out[7] = cgltf_component_read_float(element + 9, component_type, normalized);
+                out[8] = cgltf_component_read_float(element + 10, component_type, normalized);
+                return 1;
+        }
+
+        if (type == cgltf_type_mat3 && component_size == 2)
+        {
+                out[0] = cgltf_component_read_float(element, component_type, normalized);
+                out[1] = cgltf_component_read_float(element + 2, component_type, normalized);
+                out[2] = cgltf_component_read_float(element + 4, component_type, normalized);
+                out[3] = cgltf_component_read_float(element + 8, component_type, normalized);
+                out[4] = cgltf_component_read_float(element + 10, component_type, normalized);
+                out[5] = cgltf_component_read_float(element + 12, component_type, normalized);
+                out[6] = cgltf_component_read_float(element + 16, component_type, normalized);
+                out[7] = cgltf_component_read_float(element + 18, component_type, normalized);
+                out[8] = cgltf_component_read_float(element + 20, component_type, normalized);
+                return 1;
+        }
+
+        for (cgltf_size i = 0; i < num_components; ++i)
+        {
+                out[i] = cgltf_component_read_float(element + component_size * i, component_type, normalized);
+        }
+        return 1;
+}
+
+cgltf_bool cgltf_accessor_read_float(const cgltf_accessor* accessor, cgltf_size index, cgltf_float* out, cgltf_size element_size)
+{
+        if (accessor->is_sparse)
+        {
+                return 0;
+        }
+        if (accessor->buffer_view == NULL)
+        {
+                memset(out, 0, element_size * sizeof(cgltf_float));
+                return 1;
+        }
+        if (accessor->buffer_view->buffer->data == NULL)
+        {
+                return 0;
+        }
+        cgltf_size offset = accessor->offset + accessor->buffer_view->offset;
+        const uint8_t* element = (const uint8_t*) accessor->buffer_view->buffer->data;
+        element += offset + accessor->stride * index;
+        return cgltf_element_read_float(element, accessor->type, accessor->component_type, accessor->normalized, out, element_size);
+}
+
+cgltf_size cgltf_accessor_unpack_floats(const cgltf_accessor* accessor, cgltf_float* out, cgltf_size float_count)
+{
+        cgltf_size floats_per_element = cgltf_num_components(accessor->type);
+        cgltf_size available_floats = accessor->count * floats_per_element;
+        if (out == NULL)
+        {
+                return available_floats;
+        }
+
+        float_count = available_floats < float_count ? available_floats : float_count;
+        cgltf_size element_count = float_count / floats_per_element;
+
+        // First pass: convert each element in the base accessor.
+        cgltf_float* dest = out;
+        cgltf_accessor dense = *accessor;
+        dense.is_sparse = 0;
+        for (cgltf_size index = 0; index < element_count; index++, dest += floats_per_element)
+        {
+                if (!cgltf_accessor_read_float(&dense, index, dest, floats_per_element))
+                {
+                        return 0;
+                }
+        }
+
+        // Second pass: write out each element in the sparse accessor.
+        if (accessor->is_sparse)
+        {
+                const cgltf_accessor_sparse* sparse = &dense.sparse;
+
+                if (sparse->indices_buffer_view->buffer->data == NULL || sparse->values_buffer_view->buffer->data == NULL)
+                {
+                        return 0;
+                }
+
+                const uint8_t* index_data = (const uint8_t*) sparse->indices_buffer_view->buffer->data;
+                index_data += sparse->indices_byte_offset + sparse->indices_buffer_view->offset;
+                cgltf_size index_stride = cgltf_component_size(sparse->indices_component_type);
+                const uint8_t* reader_head = (const uint8_t*) sparse->values_buffer_view->buffer->data;
+                reader_head += sparse->values_byte_offset + sparse->values_buffer_view->offset;
+                for (cgltf_size reader_index = 0; reader_index < sparse->count; reader_index++, index_data += index_stride)
+                {
+                        size_t writer_index = cgltf_component_read_index(index_data, sparse->indices_component_type);
+                        float* writer_head = out + writer_index * floats_per_element;
+
+                        if (!cgltf_element_read_float(reader_head, dense.type, dense.component_type, dense.normalized, writer_head, floats_per_element))
+                        {
+                                return 0;
+                        }
+
+                        reader_head += dense.stride;
+                }
+        }
+
+        return element_count * floats_per_element;
+}
+
+static cgltf_uint cgltf_component_read_uint(const void* in, cgltf_component_type component_type)
+{
+        switch (component_type)
+        {
+                case cgltf_component_type_r_8:
+                        return *((const int8_t*) in);
+
+                case cgltf_component_type_r_8u:
+                        return *((const uint8_t*) in);
+
+                case cgltf_component_type_r_16:
+                        return *((const int16_t*) in);
+
+                case cgltf_component_type_r_16u:
+                        return *((const uint16_t*) in);
+
+                case cgltf_component_type_r_32u:
+                        return *((const uint32_t*) in);
+
+                default:
+                        return 0;
+        }
+}
+
+static cgltf_bool cgltf_element_read_uint(const uint8_t* element, cgltf_type type, cgltf_component_type component_type, cgltf_uint* out, cgltf_size element_size)
+{
+    cgltf_size num_components = cgltf_num_components(type);
+
+    if (element_size < num_components)
+    {
+        return 0;
+    }
+
+        // Reading integer matrices is not a valid use case
+    if (type == cgltf_type_mat2 || type == cgltf_type_mat3 || type == cgltf_type_mat4)
+    {
+        return 0;
+    }
+
+    cgltf_size component_size = cgltf_component_size(component_type);
+
+    for (cgltf_size i = 0; i < num_components; ++i)
+    {
+        out[i] = cgltf_component_read_uint(element + component_size * i, component_type);
+    }
+    return 1;
+}
+
+cgltf_bool cgltf_accessor_read_uint(const cgltf_accessor* accessor, cgltf_size index, cgltf_uint* out, cgltf_size element_size)
+{
+    if (accessor->is_sparse)
+    {
+        return 0;
+    }
+    if (accessor->buffer_view == NULL)
+    {
+        memset(out, 0, element_size * sizeof( cgltf_uint ));
+        return 1;
+    }
+    if (accessor->buffer_view->buffer->data == NULL)
+    {
+        return 0;
+    }
+    cgltf_size offset = accessor->offset + accessor->buffer_view->offset;
+    const uint8_t* element = (const uint8_t*) accessor->buffer_view->buffer->data;
+    element += offset + accessor->stride * index;
+    return cgltf_element_read_uint(element, accessor->type, accessor->component_type, out, element_size);
+}
+
+cgltf_size cgltf_accessor_read_index(const cgltf_accessor* accessor, cgltf_size index)
+{
+        if (accessor->is_sparse)
+        {
+                return 0; // This is an error case, but we can't communicate the error with existing interface.
+        }
+        if (accessor->buffer_view == NULL)
+        {
+                return 0;
+        }
+        if (accessor->buffer_view->buffer->data == NULL)
+        {
+                return 0; // This is an error case, but we can't communicate the error with existing interface.
+        }
+
+        cgltf_size offset = accessor->offset + accessor->buffer_view->offset;
+        const uint8_t* element = (const uint8_t*) accessor->buffer_view->buffer->data;
+        element += offset + accessor->stride * index;
+        return cgltf_component_read_index(element, accessor->component_type);
+}
+
+#define CGLTF_ERROR_JSON -1
+#define CGLTF_ERROR_NOMEM -2
+#define CGLTF_ERROR_LEGACY -3
+
+#define CGLTF_CHECK_TOKTYPE(tok_, type_) if ((tok_).type != (type_)) { return CGLTF_ERROR_JSON; }
+#define CGLTF_CHECK_KEY(tok_) if ((tok_).type != JSMN_STRING || (tok_).size == 0) { return CGLTF_ERROR_JSON; } /* checking size for 0 verifies that a value follows the key */
+
+#define CGLTF_PTRINDEX(type, idx) (type*)((cgltf_size)idx + 1)
+#define CGLTF_PTRFIXUP(var, data, size) if (var) { if ((cgltf_size)var > size) { return CGLTF_ERROR_JSON; } var = &data[(cgltf_size)var-1]; }
+#define CGLTF_PTRFIXUP_REQ(var, data, size) if (!var || (cgltf_size)var > size) { return CGLTF_ERROR_JSON; } var = &data[(cgltf_size)var-1];
+
+static int cgltf_json_strcmp(jsmntok_t const* tok, const uint8_t* json_chunk, const char* str)
+{
+        CGLTF_CHECK_TOKTYPE(*tok, JSMN_STRING);
+        size_t const str_len = strlen(str);
+        size_t const name_length = tok->end - tok->start;
+        return (str_len == name_length) ? strncmp((const char*)json_chunk + tok->start, str, str_len) : 128;
+}
+
+static int cgltf_json_to_int(jsmntok_t const* tok, const uint8_t* json_chunk)
+{
+        CGLTF_CHECK_TOKTYPE(*tok, JSMN_PRIMITIVE);
+        char tmp[128];
+        int size = (cgltf_size)(tok->end - tok->start) < sizeof(tmp) ? tok->end - tok->start : (int)(sizeof(tmp) - 1);
+        strncpy(tmp, (const char*)json_chunk + tok->start, size);
+        tmp[size] = 0;
+        return CGLTF_ATOI(tmp);
+}
+
+static cgltf_float cgltf_json_to_float(jsmntok_t const* tok, const uint8_t* json_chunk)
+{
+        CGLTF_CHECK_TOKTYPE(*tok, JSMN_PRIMITIVE);
+        char tmp[128];
+        int size = (cgltf_size)(tok->end - tok->start) < sizeof(tmp) ? tok->end - tok->start : (int)(sizeof(tmp) - 1);
+        strncpy(tmp, (const char*)json_chunk + tok->start, size);
+        tmp[size] = 0;
+        return (cgltf_float)CGLTF_ATOF(tmp);
+}
+
+static cgltf_bool cgltf_json_to_bool(jsmntok_t const* tok, const uint8_t* json_chunk)
+{
+        int size = tok->end - tok->start;
+        return size == 4 && memcmp(json_chunk + tok->start, "true", 4) == 0;
+}
+
+static int cgltf_skip_json(jsmntok_t const* tokens, int i)
+{
+        int end = i + 1;
+
+        while (i < end)
+        {
+                switch (tokens[i].type)
+                {
+                case JSMN_OBJECT:
+                        end += tokens[i].size * 2;
+                        break;
+
+                case JSMN_ARRAY:
+                        end += tokens[i].size;
+                        break;
+
+                case JSMN_PRIMITIVE:
+                case JSMN_STRING:
+                        break;
+
+                default:
+                        return -1;
+                }
+
+                i++;
+        }
+
+        return i;
+}
+
+static void cgltf_fill_float_array(float* out_array, int size, float value)
+{
+        for (int j = 0; j < size; ++j)
+        {
+                out_array[j] = value;
+        }
+}
+
+static int cgltf_parse_json_float_array(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, float* out_array, int size)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
+        if (tokens[i].size != size)
+        {
+                return CGLTF_ERROR_JSON;
+        }
+        ++i;
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
+                out_array[j] = cgltf_json_to_float(tokens + i, json_chunk);
+                ++i;
+        }
+        return i;
+}
+
+static int cgltf_parse_json_string(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, char** out_string)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_STRING);
+        if (*out_string)
+        {
+                return CGLTF_ERROR_JSON;
+        }
+        int size = tokens[i].end - tokens[i].start;
+        char* result = (char*)options->memory.alloc(options->memory.user_data, size + 1);
+        if (!result)
+        {
+                return CGLTF_ERROR_NOMEM;
+        }
+        strncpy(result, (const char*)json_chunk + tokens[i].start, size);
+        result[size] = 0;
+        *out_string = result;
+        return i + 1;
+}
+
+static int cgltf_parse_json_array(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, size_t element_size, void** out_array, cgltf_size* out_size)
+{
+        (void)json_chunk;
+        if (tokens[i].type != JSMN_ARRAY)
+        {
+                return tokens[i].type == JSMN_OBJECT ? CGLTF_ERROR_LEGACY : CGLTF_ERROR_JSON;
+        }
+        if (*out_array)
+        {
+                return CGLTF_ERROR_JSON;
+        }
+        int size = tokens[i].size;
+        void* result = cgltf_calloc(options, element_size, size);
+        if (!result)
+        {
+                return CGLTF_ERROR_NOMEM;
+        }
+        *out_array = result;
+        *out_size = size;
+        return i + 1;
+}
+
+static int cgltf_parse_json_string_array(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, char*** out_array, cgltf_size* out_size)
+{
+    CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_ARRAY);
+    i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(char*), (void**)out_array, out_size);
+    if (i < 0)
+    {
+        return i;
+    }
+
+    for (cgltf_size j = 0; j < *out_size; ++j)
+    {
+        i = cgltf_parse_json_string(options, tokens, i, json_chunk, j + (*out_array));
+        if (i < 0)
+        {
+            return i;
+        }
+    }
+    return i;
+}
+
+static void cgltf_parse_attribute_type(const char* name, cgltf_attribute_type* out_type, int* out_index)
+{
+        const char* us = strchr(name, '_');
+        size_t len = us ? (size_t)(us - name) : strlen(name);
+
+        if (len == 8 && strncmp(name, "POSITION", 8) == 0)
+        {
+                *out_type = cgltf_attribute_type_position;
+        }
+        else if (len == 6 && strncmp(name, "NORMAL", 6) == 0)
+        {
+                *out_type = cgltf_attribute_type_normal;
+        }
+        else if (len == 7 && strncmp(name, "TANGENT", 7) == 0)
+        {
+                *out_type = cgltf_attribute_type_tangent;
+        }
+        else if (len == 8 && strncmp(name, "TEXCOORD", 8) == 0)
+        {
+                *out_type = cgltf_attribute_type_texcoord;
+        }
+        else if (len == 5 && strncmp(name, "COLOR", 5) == 0)
+        {
+                *out_type = cgltf_attribute_type_color;
+        }
+        else if (len == 6 && strncmp(name, "JOINTS", 6) == 0)
+        {
+                *out_type = cgltf_attribute_type_joints;
+        }
+        else if (len == 7 && strncmp(name, "WEIGHTS", 7) == 0)
+        {
+                *out_type = cgltf_attribute_type_weights;
+        }
+        else
+        {
+                *out_type = cgltf_attribute_type_invalid;
+        }
+
+        if (us && *out_type != cgltf_attribute_type_invalid)
+        {
+                *out_index = CGLTF_ATOI(us + 1);
+        }
+}
+
+static int cgltf_parse_json_attribute_list(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_attribute** out_attributes, cgltf_size* out_attributes_count)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        if (*out_attributes)
+        {
+                return CGLTF_ERROR_JSON;
+        }
+
+        *out_attributes_count = tokens[i].size;
+        *out_attributes = (cgltf_attribute*)cgltf_calloc(options, sizeof(cgltf_attribute), *out_attributes_count);
+        ++i;
+
+        if (!*out_attributes)
+        {
+                return CGLTF_ERROR_NOMEM;
+        }
+
+        for (cgltf_size j = 0; j < *out_attributes_count; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                i = cgltf_parse_json_string(options, tokens, i, json_chunk, &(*out_attributes)[j].name);
+                if (i < 0)
+                {
+                        return CGLTF_ERROR_JSON;
+                }
+
+                cgltf_parse_attribute_type((*out_attributes)[j].name, &(*out_attributes)[j].type, &(*out_attributes)[j].index);
+
+                (*out_attributes)[j].data = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
+                ++i;
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_extras(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_extras* out_extras)
+{
+        (void)json_chunk;
+        out_extras->start_offset = tokens[i].start;
+        out_extras->end_offset = tokens[i].end;
+        i = cgltf_skip_json(tokens, i);
+        return i;
+}
+
+static int cgltf_parse_json_unprocessed_extension(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_extension* out_extension)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_STRING);
+        CGLTF_CHECK_TOKTYPE(tokens[i+1], JSMN_OBJECT);
+        if (out_extension->name)
+        {
+                return CGLTF_ERROR_JSON;
+        }
+
+        cgltf_size name_length = tokens[i].end - tokens[i].start;
+        out_extension->name = (char*)options->memory.alloc(options->memory.user_data, name_length + 1);
+        if (!out_extension->name)
+        {
+                return CGLTF_ERROR_NOMEM;
+        }
+        strncpy(out_extension->name, (const char*)json_chunk + tokens[i].start, name_length);
+        out_extension->name[name_length] = 0;
+        i++;
+
+        size_t start = tokens[i].start;
+        size_t size = tokens[i].end - start;
+        out_extension->data = (char*)options->memory.alloc(options->memory.user_data, size + 1);
+        if (!out_extension->data)
+        {
+                return CGLTF_ERROR_NOMEM;
+        }
+        strncpy(out_extension->data, (const char*)json_chunk + start, size);
+        out_extension->data[size] = '\0';
+
+        i = cgltf_skip_json(tokens, i);
+
+        return i;
+}
+
+static int cgltf_parse_json_unprocessed_extensions(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_size* out_extensions_count, cgltf_extension** out_extensions)
+{
+        ++i;
+
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+        if(*out_extensions)
+        {
+                return CGLTF_ERROR_JSON;
+        }
+
+        int extensions_size = tokens[i].size;
+        *out_extensions_count = 0;
+        *out_extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
+
+        if (!*out_extensions)
+        {
+                return CGLTF_ERROR_NOMEM;
+        }
+
+        ++i;
+
+        for (int j = 0; j < extensions_size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                cgltf_size extension_index = (*out_extensions_count)++;
+                cgltf_extension* extension = &((*out_extensions)[extension_index]);
+                i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, extension);
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_draco_mesh_compression(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_draco_mesh_compression* out_draco_mesh_compression)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens + i, json_chunk, "attributes") == 0)
+                {
+                        i = cgltf_parse_json_attribute_list(options, tokens, i + 1, json_chunk, &out_draco_mesh_compression->attributes, &out_draco_mesh_compression->attributes_count);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "bufferView") == 0)
+                {
+                        ++i;
+                        out_draco_mesh_compression->buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_primitive(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_primitive* out_prim)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        out_prim->type = cgltf_primitive_type_triangles;
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "mode") == 0)
+                {
+                        ++i;
+                        out_prim->type
+                                        = (cgltf_primitive_type)
+                                        cgltf_json_to_int(tokens+i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "indices") == 0)
+                {
+                        ++i;
+                        out_prim->indices = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "material") == 0)
+                {
+                        ++i;
+                        out_prim->material = CGLTF_PTRINDEX(cgltf_material, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "attributes") == 0)
+                {
+                        i = cgltf_parse_json_attribute_list(options, tokens, i + 1, json_chunk, &out_prim->attributes, &out_prim->attributes_count);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "targets") == 0)
+                {
+                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_morph_target), (void**)&out_prim->targets, &out_prim->targets_count);
+                        if (i < 0)
+                        {
+                                return i;
+                        }
+
+                        for (cgltf_size k = 0; k < out_prim->targets_count; ++k)
+                        {
+                                i = cgltf_parse_json_attribute_list(options, tokens, i, json_chunk, &out_prim->targets[k].attributes, &out_prim->targets[k].attributes_count);
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_prim->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        ++i;
+
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+                        if(out_prim->extensions)
+                        {
+                                return CGLTF_ERROR_JSON;
+                        }
+
+                        int extensions_size = tokens[i].size;
+                        out_prim->extensions_count = 0;
+                        out_prim->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
+
+                        if (!out_prim->extensions)
+                        {
+                                return CGLTF_ERROR_NOMEM;
+                        }
+
+                        ++i;
+                        for (int k = 0; k < extensions_size; ++k)
+                        {
+                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_draco_mesh_compression") == 0)
+                                {
+                                        out_prim->has_draco_mesh_compression = 1;
+                                        i = cgltf_parse_json_draco_mesh_compression(options, tokens, i + 1, json_chunk, &out_prim->draco_mesh_compression);
+                                }
+                                else
+                                {
+                                        i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_prim->extensions[out_prim->extensions_count++]));
+                                }
+
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_mesh(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_mesh* out_mesh)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_mesh->name);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "primitives") == 0)
+                {
+                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_primitive), (void**)&out_mesh->primitives, &out_mesh->primitives_count);
+                        if (i < 0)
+                        {
+                                return i;
+                        }
+
+                        for (cgltf_size prim_index = 0; prim_index < out_mesh->primitives_count; ++prim_index)
+                        {
+                                i = cgltf_parse_json_primitive(options, tokens, i, json_chunk, &out_mesh->primitives[prim_index]);
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "weights") == 0)
+                {
+                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_float), (void**)&out_mesh->weights, &out_mesh->weights_count);
+                        if (i < 0)
+                        {
+                                return i;
+                        }
+
+                        i = cgltf_parse_json_float_array(tokens, i - 1, json_chunk, out_mesh->weights, (int)out_mesh->weights_count);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        ++i;
+
+                        out_mesh->extras.start_offset = tokens[i].start;
+                        out_mesh->extras.end_offset = tokens[i].end;
+
+                        if (tokens[i].type == JSMN_OBJECT)
+                        {
+                                int extras_size = tokens[i].size;
+                                ++i;
+
+                                for (int k = 0; k < extras_size; ++k)
+                                {
+                                        CGLTF_CHECK_KEY(tokens[i]);
+
+                                        if (cgltf_json_strcmp(tokens+i, json_chunk, "targetNames") == 0)
+                                        {
+                                                i = cgltf_parse_json_string_array(options, tokens, i + 1, json_chunk, &out_mesh->target_names, &out_mesh->target_names_count);
+                                        }
+                                        else
+                                        {
+                                                i = cgltf_skip_json(tokens, i+1);
+                                        }
+
+                                        if (i < 0)
+                                        {
+                                                return i;
+                                        }
+                                }
+                        }
+                        else
+                        {
+                                i = cgltf_skip_json(tokens, i);
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_mesh->extensions_count, &out_mesh->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_meshes(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_mesh), (void**)&out_data->meshes, &out_data->meshes_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->meshes_count; ++j)
+        {
+                i = cgltf_parse_json_mesh(options, tokens, i, json_chunk, &out_data->meshes[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static cgltf_component_type cgltf_json_to_component_type(jsmntok_t const* tok, const uint8_t* json_chunk)
+{
+        int type = cgltf_json_to_int(tok, json_chunk);
+
+        switch (type)
+        {
+        case 5120:
+                return cgltf_component_type_r_8;
+        case 5121:
+                return cgltf_component_type_r_8u;
+        case 5122:
+                return cgltf_component_type_r_16;
+        case 5123:
+                return cgltf_component_type_r_16u;
+        case 5125:
+                return cgltf_component_type_r_32u;
+        case 5126:
+                return cgltf_component_type_r_32f;
+        default:
+                return cgltf_component_type_invalid;
+        }
+}
+
+static int cgltf_parse_json_accessor_sparse(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_accessor_sparse* out_sparse)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "count") == 0)
+                {
+                        ++i;
+                        out_sparse->count = cgltf_json_to_int(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "indices") == 0)
+                {
+                        ++i;
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+                        int indices_size = tokens[i].size;
+                        ++i;
+
+                        for (int k = 0; k < indices_size; ++k)
+                        {
+                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
+                                {
+                                        ++i;
+                                        out_sparse->indices_buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
+                                {
+                                        ++i;
+                                        out_sparse->indices_byte_offset = cgltf_json_to_int(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "componentType") == 0)
+                                {
+                                        ++i;
+                                        out_sparse->indices_component_type = cgltf_json_to_component_type(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                                {
+                                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_sparse->indices_extras);
+                                }
+                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                                {
+                                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_sparse->indices_extensions_count, &out_sparse->indices_extensions);
+                                }
+                                else
+                                {
+                                        i = cgltf_skip_json(tokens, i+1);
+                                }
+
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "values") == 0)
+                {
+                        ++i;
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+                        int values_size = tokens[i].size;
+                        ++i;
+
+                        for (int k = 0; k < values_size; ++k)
+                        {
+                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
+                                {
+                                        ++i;
+                                        out_sparse->values_buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
+                                {
+                                        ++i;
+                                        out_sparse->values_byte_offset = cgltf_json_to_int(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                                {
+                                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_sparse->values_extras);
+                                }
+                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                                {
+                                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_sparse->values_extensions_count, &out_sparse->values_extensions);
+                                }
+                                else
+                                {
+                                        i = cgltf_skip_json(tokens, i+1);
+                                }
+
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_sparse->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_sparse->extensions_count, &out_sparse->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_accessor(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_accessor* out_accessor)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
+                {
+                        ++i;
+                        out_accessor->buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
+                {
+                        ++i;
+                        out_accessor->offset =
+                                        cgltf_json_to_int(tokens+i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "componentType") == 0)
+                {
+                        ++i;
+                        out_accessor->component_type = cgltf_json_to_component_type(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "normalized") == 0)
+                {
+                        ++i;
+                        out_accessor->normalized = cgltf_json_to_bool(tokens+i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "count") == 0)
+                {
+                        ++i;
+                        out_accessor->count =
+                                        cgltf_json_to_int(tokens+i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "type") == 0)
+                {
+                        ++i;
+                        if (cgltf_json_strcmp(tokens+i, json_chunk, "SCALAR") == 0)
+                        {
+                                out_accessor->type = cgltf_type_scalar;
+                        }
+                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "VEC2") == 0)
+                        {
+                                out_accessor->type = cgltf_type_vec2;
+                        }
+                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "VEC3") == 0)
+                        {
+                                out_accessor->type = cgltf_type_vec3;
+                        }
+                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "VEC4") == 0)
+                        {
+                                out_accessor->type = cgltf_type_vec4;
+                        }
+                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "MAT2") == 0)
+                        {
+                                out_accessor->type = cgltf_type_mat2;
+                        }
+                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "MAT3") == 0)
+                        {
+                                out_accessor->type = cgltf_type_mat3;
+                        }
+                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "MAT4") == 0)
+                        {
+                                out_accessor->type = cgltf_type_mat4;
+                        }
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "min") == 0)
+                {
+                        ++i;
+                        out_accessor->has_min = 1;
+                        // note: we can't parse the precise number of elements since type may not have been computed yet
+                        int min_size = tokens[i].size > 16 ? 16 : tokens[i].size;
+                        i = cgltf_parse_json_float_array(tokens, i, json_chunk, out_accessor->min, min_size);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "max") == 0)
+                {
+                        ++i;
+                        out_accessor->has_max = 1;
+                        // note: we can't parse the precise number of elements since type may not have been computed yet
+                        int max_size = tokens[i].size > 16 ? 16 : tokens[i].size;
+                        i = cgltf_parse_json_float_array(tokens, i, json_chunk, out_accessor->max, max_size);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "sparse") == 0)
+                {
+                        out_accessor->is_sparse = 1;
+                        i = cgltf_parse_json_accessor_sparse(options, tokens, i + 1, json_chunk, &out_accessor->sparse);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_accessor->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_accessor->extensions_count, &out_accessor->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_texture_transform(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_texture_transform* out_texture_transform)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens + i, json_chunk, "offset") == 0)
+                {
+                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_texture_transform->offset, 2);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "rotation") == 0)
+                {
+                        ++i;
+                        out_texture_transform->rotation = cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "scale") == 0)
+                {
+                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_texture_transform->scale, 2);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "texCoord") == 0)
+                {
+                        ++i;
+                        out_texture_transform->texcoord = cgltf_json_to_int(tokens + i, json_chunk);
+                        ++i;
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i + 1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_texture_view(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_texture_view* out_texture_view)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        out_texture_view->scale = 1.0f;
+        cgltf_fill_float_array(out_texture_view->transform.scale, 2, 1.0f);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens + i, json_chunk, "index") == 0)
+                {
+                        ++i;
+                        out_texture_view->texture = CGLTF_PTRINDEX(cgltf_texture, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "texCoord") == 0)
+                {
+                        ++i;
+                        out_texture_view->texcoord = cgltf_json_to_int(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "scale") == 0) 
+                {
+                        ++i;
+                        out_texture_view->scale = cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "strength") == 0)
+                {
+                        ++i;
+                        out_texture_view->scale = cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_texture_view->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        ++i;
+
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+                        if(out_texture_view->extensions)
+                        {
+                                return CGLTF_ERROR_JSON;
+                        }
+
+                        int extensions_size = tokens[i].size;
+                        out_texture_view->extensions_count = 0;
+                        out_texture_view->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
+
+                        if (!out_texture_view->extensions)
+                        {
+                                return CGLTF_ERROR_NOMEM;
+                        }
+
+                        ++i;
+
+                        for (int k = 0; k < extensions_size; ++k)
+                        {
+                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_texture_transform") == 0)
+                                {
+                                        out_texture_view->has_transform = 1;
+                                        i = cgltf_parse_json_texture_transform(tokens, i + 1, json_chunk, &out_texture_view->transform);
+                                }
+                                else
+                                {
+                                        i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_texture_view->extensions[out_texture_view->extensions_count++]));
+                                }
+
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i + 1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_pbr_metallic_roughness(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_pbr_metallic_roughness* out_pbr)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "metallicFactor") == 0)
+                {
+                        ++i;
+                        out_pbr->metallic_factor = 
+                                cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "roughnessFactor") == 0) 
+                {
+                        ++i;
+                        out_pbr->roughness_factor =
+                                cgltf_json_to_float(tokens+i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "baseColorFactor") == 0)
+                {
+                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_pbr->base_color_factor, 4);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "baseColorTexture") == 0)
+                {
+                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
+                                &out_pbr->base_color_texture);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "metallicRoughnessTexture") == 0)
+                {
+                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
+                                &out_pbr->metallic_roughness_texture);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_pbr->extras);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_pbr_specular_glossiness(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_pbr_specular_glossiness* out_pbr)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "diffuseFactor") == 0)
+                {
+                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_pbr->diffuse_factor, 4);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "specularFactor") == 0)
+                {
+                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_pbr->specular_factor, 3);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "glossinessFactor") == 0)
+                {
+                        ++i;
+                        out_pbr->glossiness_factor = cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "diffuseTexture") == 0)
+                {
+                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_pbr->diffuse_texture);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "specularGlossinessTexture") == 0)
+                {
+                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_pbr->specular_glossiness_texture);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_clearcoat(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_clearcoat* out_clearcoat)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatFactor") == 0)
+                {
+                        ++i;
+                        out_clearcoat->clearcoat_factor = cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatRoughnessFactor") == 0)
+                {
+                        ++i;
+                        out_clearcoat->clearcoat_roughness_factor = cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatTexture") == 0)
+                {
+                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_clearcoat->clearcoat_texture);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatRoughnessTexture") == 0)
+                {
+                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_clearcoat->clearcoat_roughness_texture);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "clearcoatNormalTexture") == 0)
+                {
+                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_clearcoat->clearcoat_normal_texture);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_ior(jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_ior* out_ior)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+        int size = tokens[i].size;
+        ++i;
+
+        // Default values
+        out_ior->ior = 1.5f;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "ior") == 0)
+                {
+                        ++i;
+                        out_ior->ior = cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_specular(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_specular* out_specular)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+        int size = tokens[i].size;
+        ++i;
+
+        // Default values
+        out_specular->specular_factor = 1.0f;
+        cgltf_fill_float_array(out_specular->specular_color_factor, 3, 1.0f);
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "specularFactor") == 0)
+                {
+                        ++i;
+                        out_specular->specular_factor = cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "specularColorFactor") == 0)
+                {
+                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_specular->specular_color_factor, 3);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "specularTexture") == 0)
+                {
+                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_specular->specular_texture);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_transmission(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_transmission* out_transmission)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "transmissionFactor") == 0)
+                {
+                        ++i;
+                        out_transmission->transmission_factor = cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "transmissionTexture") == 0)
+                {
+                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk, &out_transmission->transmission_texture);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_image(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_image* out_image)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j) 
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens + i, json_chunk, "uri") == 0) 
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_image->uri);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "bufferView") == 0)
+                {
+                        ++i;
+                        out_image->buffer_view = CGLTF_PTRINDEX(cgltf_buffer_view, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "mimeType") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_image->mime_type);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "name") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_image->name);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_image->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_image->extensions_count, &out_image->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i + 1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_sampler(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_sampler* out_sampler)
+{
+        (void)options;
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        out_sampler->wrap_s = 10497;
+        out_sampler->wrap_t = 10497;
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens + i, json_chunk, "magFilter") == 0) 
+                {
+                        ++i;
+                        out_sampler->mag_filter
+                                = cgltf_json_to_int(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "minFilter") == 0)
+                {
+                        ++i;
+                        out_sampler->min_filter
+                                = cgltf_json_to_int(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "wrapS") == 0)
+                {
+                        ++i;
+                        out_sampler->wrap_s
+                                = cgltf_json_to_int(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "wrapT") == 0) 
+                {
+                        ++i;
+                        out_sampler->wrap_t
+                                = cgltf_json_to_int(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_sampler->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_sampler->extensions_count, &out_sampler->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i + 1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_texture(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_texture* out_texture)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_texture->name);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "sampler") == 0)
+                {
+                        ++i;
+                        out_texture->sampler = CGLTF_PTRINDEX(cgltf_sampler, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "source") == 0) 
+                {
+                        ++i;
+                        out_texture->image = CGLTF_PTRINDEX(cgltf_image, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_texture->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_texture->extensions_count, &out_texture->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i + 1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_material(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_material* out_material)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        cgltf_fill_float_array(out_material->pbr_metallic_roughness.base_color_factor, 4, 1.0f);
+        out_material->pbr_metallic_roughness.metallic_factor = 1.0f;
+        out_material->pbr_metallic_roughness.roughness_factor = 1.0f;
+
+        cgltf_fill_float_array(out_material->pbr_specular_glossiness.diffuse_factor, 4, 1.0f);
+        cgltf_fill_float_array(out_material->pbr_specular_glossiness.specular_factor, 3, 1.0f);
+        out_material->pbr_specular_glossiness.glossiness_factor = 1.0f;
+
+        out_material->alpha_cutoff = 0.5f;
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_material->name);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "pbrMetallicRoughness") == 0)
+                {
+                        out_material->has_pbr_metallic_roughness = 1;
+                        i = cgltf_parse_json_pbr_metallic_roughness(options, tokens, i + 1, json_chunk, &out_material->pbr_metallic_roughness);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "emissiveFactor") == 0)
+                {
+                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_material->emissive_factor, 3);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "normalTexture") == 0)
+                {
+                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
+                                &out_material->normal_texture);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "occlusionTexture") == 0)
+                {
+                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
+                                &out_material->occlusion_texture);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "emissiveTexture") == 0)
+                {
+                        i = cgltf_parse_json_texture_view(options, tokens, i + 1, json_chunk,
+                                &out_material->emissive_texture);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "alphaMode") == 0)
+                {
+                        ++i;
+                        if (cgltf_json_strcmp(tokens + i, json_chunk, "OPAQUE") == 0)
+                        {
+                                out_material->alpha_mode = cgltf_alpha_mode_opaque;
+                        }
+                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "MASK") == 0)
+                        {
+                                out_material->alpha_mode = cgltf_alpha_mode_mask;
+                        }
+                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "BLEND") == 0)
+                        {
+                                out_material->alpha_mode = cgltf_alpha_mode_blend;
+                        }
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "alphaCutoff") == 0)
+                {
+                        ++i;
+                        out_material->alpha_cutoff = cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "doubleSided") == 0)
+                {
+                        ++i;
+                        out_material->double_sided =
+                                cgltf_json_to_bool(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_material->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        ++i;
+
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+                        if(out_material->extensions)
+                        {
+                                return CGLTF_ERROR_JSON;
+                        }
+
+                        int extensions_size = tokens[i].size;
+                        ++i;
+                        out_material->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
+                        out_material->extensions_count= 0;
+
+                        if (!out_material->extensions)
+                        {
+                                return CGLTF_ERROR_NOMEM;
+                        }
+
+                        for (int k = 0; k < extensions_size; ++k)
+                        {
+                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_pbrSpecularGlossiness") == 0)
+                                {
+                                        out_material->has_pbr_specular_glossiness = 1;
+                                        i = cgltf_parse_json_pbr_specular_glossiness(options, tokens, i + 1, json_chunk, &out_material->pbr_specular_glossiness);
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_unlit") == 0)
+                                {
+                                        out_material->unlit = 1;
+                                        i = cgltf_skip_json(tokens, i+1);
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_clearcoat") == 0)
+                                {
+                                        out_material->has_clearcoat = 1;
+                                        i = cgltf_parse_json_clearcoat(options, tokens, i + 1, json_chunk, &out_material->clearcoat);
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_ior") == 0)
+                                {
+                                        out_material->has_ior = 1;
+                                        i = cgltf_parse_json_ior(tokens, i + 1, json_chunk, &out_material->ior);
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_specular") == 0)
+                                {
+                                        out_material->has_specular = 1;
+                                        i = cgltf_parse_json_specular(options, tokens, i + 1, json_chunk, &out_material->specular);
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_materials_transmission") == 0)
+                                {
+                                        out_material->has_transmission = 1;
+                                        i = cgltf_parse_json_transmission(options, tokens, i + 1, json_chunk, &out_material->transmission);
+                                }
+                                else
+                                {
+                                        i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_material->extensions[out_material->extensions_count++]));
+                                }
+
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_accessors(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_accessor), (void**)&out_data->accessors, &out_data->accessors_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->accessors_count; ++j)
+        {
+                i = cgltf_parse_json_accessor(options, tokens, i, json_chunk, &out_data->accessors[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_materials(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_material), (void**)&out_data->materials, &out_data->materials_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->materials_count; ++j)
+        {
+                i = cgltf_parse_json_material(options, tokens, i, json_chunk, &out_data->materials[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_images(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_image), (void**)&out_data->images, &out_data->images_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->images_count; ++j)
+        {
+                i = cgltf_parse_json_image(options, tokens, i, json_chunk, &out_data->images[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_textures(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_texture), (void**)&out_data->textures, &out_data->textures_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->textures_count; ++j)
+        {
+                i = cgltf_parse_json_texture(options, tokens, i, json_chunk, &out_data->textures[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_samplers(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_sampler), (void**)&out_data->samplers, &out_data->samplers_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->samplers_count; ++j)
+        {
+                i = cgltf_parse_json_sampler(options, tokens, i, json_chunk, &out_data->samplers[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_buffer_view(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_buffer_view* out_buffer_view)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "buffer") == 0)
+                {
+                        ++i;
+                        out_buffer_view->buffer = CGLTF_PTRINDEX(cgltf_buffer, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteOffset") == 0)
+                {
+                        ++i;
+                        out_buffer_view->offset =
+                                        cgltf_json_to_int(tokens+i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteLength") == 0)
+                {
+                        ++i;
+                        out_buffer_view->size =
+                                        cgltf_json_to_int(tokens+i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "byteStride") == 0)
+                {
+                        ++i;
+                        out_buffer_view->stride =
+                                        cgltf_json_to_int(tokens+i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "target") == 0)
+                {
+                        ++i;
+                        int type = cgltf_json_to_int(tokens+i, json_chunk);
+                        switch (type)
+                        {
+                        case 34962:
+                                type = cgltf_buffer_view_type_vertices;
+                                break;
+                        case 34963:
+                                type = cgltf_buffer_view_type_indices;
+                                break;
+                        default:
+                                type = cgltf_buffer_view_type_invalid;
+                                break;
+                        }
+                        out_buffer_view->type = (cgltf_buffer_view_type)type;
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_buffer_view->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_buffer_view->extensions_count, &out_buffer_view->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_buffer_views(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_buffer_view), (void**)&out_data->buffer_views, &out_data->buffer_views_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->buffer_views_count; ++j)
+        {
+                i = cgltf_parse_json_buffer_view(options, tokens, i, json_chunk, &out_data->buffer_views[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_buffer(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_buffer* out_buffer)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "byteLength") == 0)
+                {
+                        ++i;
+                        out_buffer->size =
+                                        cgltf_json_to_int(tokens+i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "uri") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_buffer->uri);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_buffer->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_buffer->extensions_count, &out_buffer->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_buffers(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_buffer), (void**)&out_data->buffers, &out_data->buffers_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->buffers_count; ++j)
+        {
+                i = cgltf_parse_json_buffer(options, tokens, i, json_chunk, &out_data->buffers[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_skin(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_skin* out_skin)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_skin->name);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "joints") == 0)
+                {
+                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_node*), (void**)&out_skin->joints, &out_skin->joints_count);
+                        if (i < 0)
+                        {
+                                return i;
+                        }
+
+                        for (cgltf_size k = 0; k < out_skin->joints_count; ++k)
+                        {
+                                out_skin->joints[k] = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
+                                ++i;
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "skeleton") == 0)
+                {
+                        ++i;
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
+                        out_skin->skeleton = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "inverseBindMatrices") == 0)
+                {
+                        ++i;
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
+                        out_skin->inverse_bind_matrices = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_skin->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_skin->extensions_count, &out_skin->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_skins(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_skin), (void**)&out_data->skins, &out_data->skins_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->skins_count; ++j)
+        {
+                i = cgltf_parse_json_skin(options, tokens, i, json_chunk, &out_data->skins[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_camera(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_camera* out_camera)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_camera->name);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "type") == 0)
+                {
+                        ++i;
+                        if (cgltf_json_strcmp(tokens + i, json_chunk, "perspective") == 0)
+                        {
+                                out_camera->type = cgltf_camera_type_perspective;
+                        }
+                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "orthographic") == 0)
+                        {
+                                out_camera->type = cgltf_camera_type_orthographic;
+                        }
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "perspective") == 0)
+                {
+                        ++i;
+
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+                        int data_size = tokens[i].size;
+                        ++i;
+
+                        out_camera->type = cgltf_camera_type_perspective;
+
+                        for (int k = 0; k < data_size; ++k)
+                        {
+                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                if (cgltf_json_strcmp(tokens+i, json_chunk, "aspectRatio") == 0)
+                                {
+                                        ++i;
+                                        out_camera->data.perspective.aspect_ratio = cgltf_json_to_float(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "yfov") == 0)
+                                {
+                                        ++i;
+                                        out_camera->data.perspective.yfov = cgltf_json_to_float(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "zfar") == 0)
+                                {
+                                        ++i;
+                                        out_camera->data.perspective.zfar = cgltf_json_to_float(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "znear") == 0)
+                                {
+                                        ++i;
+                                        out_camera->data.perspective.znear = cgltf_json_to_float(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                                {
+                                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_camera->data.perspective.extras);
+                                }
+                                else
+                                {
+                                        i = cgltf_skip_json(tokens, i+1);
+                                }
+
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "orthographic") == 0)
+                {
+                        ++i;
+
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+                        int data_size = tokens[i].size;
+                        ++i;
+
+                        out_camera->type = cgltf_camera_type_orthographic;
+
+                        for (int k = 0; k < data_size; ++k)
+                        {
+                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                if (cgltf_json_strcmp(tokens+i, json_chunk, "xmag") == 0)
+                                {
+                                        ++i;
+                                        out_camera->data.orthographic.xmag = cgltf_json_to_float(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "ymag") == 0)
+                                {
+                                        ++i;
+                                        out_camera->data.orthographic.ymag = cgltf_json_to_float(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "zfar") == 0)
+                                {
+                                        ++i;
+                                        out_camera->data.orthographic.zfar = cgltf_json_to_float(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "znear") == 0)
+                                {
+                                        ++i;
+                                        out_camera->data.orthographic.znear = cgltf_json_to_float(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                                {
+                                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_camera->data.orthographic.extras);
+                                }
+                                else
+                                {
+                                        i = cgltf_skip_json(tokens, i+1);
+                                }
+
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_camera->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_camera->extensions_count, &out_camera->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_cameras(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_camera), (void**)&out_data->cameras, &out_data->cameras_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->cameras_count; ++j)
+        {
+                i = cgltf_parse_json_camera(options, tokens, i, json_chunk, &out_data->cameras[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_light(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_light* out_light)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_light->name);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "color") == 0)
+                {
+                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_light->color, 3);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "intensity") == 0)
+                {
+                        ++i;
+                        out_light->intensity = cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "type") == 0)
+                {
+                        ++i;
+                        if (cgltf_json_strcmp(tokens + i, json_chunk, "directional") == 0)
+                        {
+                                out_light->type = cgltf_light_type_directional;
+                        }
+                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "point") == 0)
+                        {
+                                out_light->type = cgltf_light_type_point;
+                        }
+                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "spot") == 0)
+                        {
+                                out_light->type = cgltf_light_type_spot;
+                        }
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "range") == 0)
+                {
+                        ++i;
+                        out_light->range = cgltf_json_to_float(tokens + i, json_chunk);
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "spot") == 0)
+                {
+                        ++i;
+
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+                        int data_size = tokens[i].size;
+                        ++i;
+
+                        for (int k = 0; k < data_size; ++k)
+                        {
+                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                if (cgltf_json_strcmp(tokens+i, json_chunk, "innerConeAngle") == 0)
+                                {
+                                        ++i;
+                                        out_light->spot_inner_cone_angle = cgltf_json_to_float(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "outerConeAngle") == 0)
+                                {
+                                        ++i;
+                                        out_light->spot_outer_cone_angle = cgltf_json_to_float(tokens + i, json_chunk);
+                                        ++i;
+                                }
+                                else
+                                {
+                                        i = cgltf_skip_json(tokens, i+1);
+                                }
+
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_lights(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_light), (void**)&out_data->lights, &out_data->lights_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->lights_count; ++j)
+        {
+                i = cgltf_parse_json_light(options, tokens, i, json_chunk, &out_data->lights[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_node(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_node* out_node)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        out_node->rotation[3] = 1.0f;
+        out_node->scale[0] = 1.0f;
+        out_node->scale[1] = 1.0f;
+        out_node->scale[2] = 1.0f;
+        out_node->matrix[0] = 1.0f;
+        out_node->matrix[5] = 1.0f;
+        out_node->matrix[10] = 1.0f;
+        out_node->matrix[15] = 1.0f;
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_node->name);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "children") == 0)
+                {
+                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_node*), (void**)&out_node->children, &out_node->children_count);
+                        if (i < 0)
+                        {
+                                return i;
+                        }
+
+                        for (cgltf_size k = 0; k < out_node->children_count; ++k)
+                        {
+                                out_node->children[k] = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
+                                ++i;
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "mesh") == 0)
+                {
+                        ++i;
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
+                        out_node->mesh = CGLTF_PTRINDEX(cgltf_mesh, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "skin") == 0)
+                {
+                        ++i;
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
+                        out_node->skin = CGLTF_PTRINDEX(cgltf_skin, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "camera") == 0)
+                {
+                        ++i;
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
+                        out_node->camera = CGLTF_PTRINDEX(cgltf_camera, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "translation") == 0)
+                {
+                        out_node->has_translation = 1;
+                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_node->translation, 3);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "rotation") == 0)
+                {
+                        out_node->has_rotation = 1;
+                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_node->rotation, 4);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "scale") == 0)
+                {
+                        out_node->has_scale = 1;
+                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_node->scale, 3);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "matrix") == 0)
+                {
+                        out_node->has_matrix = 1;
+                        i = cgltf_parse_json_float_array(tokens, i + 1, json_chunk, out_node->matrix, 16);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "weights") == 0)
+                {
+                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_float), (void**)&out_node->weights, &out_node->weights_count);
+                        if (i < 0)
+                        {
+                                return i;
+                        }
+
+                        i = cgltf_parse_json_float_array(tokens, i - 1, json_chunk, out_node->weights, (int)out_node->weights_count);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_node->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        ++i;
+
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+                        if(out_node->extensions)
+                        {
+                                return CGLTF_ERROR_JSON;
+                        }
+
+                        int extensions_size = tokens[i].size;
+                        out_node->extensions_count= 0;
+                        out_node->extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
+
+                        if (!out_node->extensions)
+                        {
+                                return CGLTF_ERROR_NOMEM;
+                        }
+
+                        ++i;
+
+                        for (int k = 0; k < extensions_size; ++k)
+                        {
+                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_lights_punctual") == 0)
+                                {
+                                        ++i;
+
+                                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+                                        int data_size = tokens[i].size;
+                                        ++i;
+
+                                        for (int m = 0; m < data_size; ++m)
+                                        {
+                                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                                if (cgltf_json_strcmp(tokens + i, json_chunk, "light") == 0)
+                                                {
+                                                        ++i;
+                                                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_PRIMITIVE);
+                                                        out_node->light = CGLTF_PTRINDEX(cgltf_light, cgltf_json_to_int(tokens + i, json_chunk));
+                                                        ++i;
+                                                }
+                                                else
+                                                {
+                                                        i = cgltf_skip_json(tokens, i + 1);
+                                                }
+
+                                                if (i < 0)
+                                                {
+                                                        return i;
+                                                }
+                                        }
+                                }
+                                else
+                                {
+                                        i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_node->extensions[out_node->extensions_count++]));
+                                }
+
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_nodes(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_node), (void**)&out_data->nodes, &out_data->nodes_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->nodes_count; ++j)
+        {
+                i = cgltf_parse_json_node(options, tokens, i, json_chunk, &out_data->nodes[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_scene(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_scene* out_scene)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_scene->name);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "nodes") == 0)
+                {
+                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_node*), (void**)&out_scene->nodes, &out_scene->nodes_count);
+                        if (i < 0)
+                        {
+                                return i;
+                        }
+
+                        for (cgltf_size k = 0; k < out_scene->nodes_count; ++k)
+                        {
+                                out_scene->nodes[k] = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
+                                ++i;
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_scene->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_scene->extensions_count, &out_scene->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_scenes(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_scene), (void**)&out_data->scenes, &out_data->scenes_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->scenes_count; ++j)
+        {
+                i = cgltf_parse_json_scene(options, tokens, i, json_chunk, &out_data->scenes[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_animation_sampler(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_animation_sampler* out_sampler)
+{
+        (void)options;
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "input") == 0)
+                {
+                        ++i;
+                        out_sampler->input = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "output") == 0)
+                {
+                        ++i;
+                        out_sampler->output = CGLTF_PTRINDEX(cgltf_accessor, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "interpolation") == 0)
+                {
+                        ++i;
+                        if (cgltf_json_strcmp(tokens + i, json_chunk, "LINEAR") == 0)
+                        {
+                                out_sampler->interpolation = cgltf_interpolation_type_linear;
+                        }
+                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "STEP") == 0)
+                        {
+                                out_sampler->interpolation = cgltf_interpolation_type_step;
+                        }
+                        else if (cgltf_json_strcmp(tokens + i, json_chunk, "CUBICSPLINE") == 0)
+                        {
+                                out_sampler->interpolation = cgltf_interpolation_type_cubic_spline;
+                        }
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_sampler->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_sampler->extensions_count, &out_sampler->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_animation_channel(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_animation_channel* out_channel)
+{
+        (void)options;
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "sampler") == 0)
+                {
+                        ++i;
+                        out_channel->sampler = CGLTF_PTRINDEX(cgltf_animation_sampler, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "target") == 0)
+                {
+                        ++i;
+
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+                        int target_size = tokens[i].size;
+                        ++i;
+
+                        for (int k = 0; k < target_size; ++k)
+                        {
+                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                if (cgltf_json_strcmp(tokens+i, json_chunk, "node") == 0)
+                                {
+                                        ++i;
+                                        out_channel->target_node = CGLTF_PTRINDEX(cgltf_node, cgltf_json_to_int(tokens + i, json_chunk));
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens+i, json_chunk, "path") == 0)
+                                {
+                                        ++i;
+                                        if (cgltf_json_strcmp(tokens+i, json_chunk, "translation") == 0)
+                                        {
+                                                out_channel->target_path = cgltf_animation_path_type_translation;
+                                        }
+                                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "rotation") == 0)
+                                        {
+                                                out_channel->target_path = cgltf_animation_path_type_rotation;
+                                        }
+                                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "scale") == 0)
+                                        {
+                                                out_channel->target_path = cgltf_animation_path_type_scale;
+                                        }
+                                        else if (cgltf_json_strcmp(tokens+i, json_chunk, "weights") == 0)
+                                        {
+                                                out_channel->target_path = cgltf_animation_path_type_weights;
+                                        }
+                                        ++i;
+                                }
+                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                                {
+                                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_channel->extras);
+                                }
+                                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                                {
+                                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_channel->extensions_count, &out_channel->extensions);
+                                }
+                                else
+                                {
+                                        i = cgltf_skip_json(tokens, i+1);
+                                }
+
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_animation(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_animation* out_animation)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "name") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_animation->name);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "samplers") == 0)
+                {
+                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_animation_sampler), (void**)&out_animation->samplers, &out_animation->samplers_count);
+                        if (i < 0)
+                        {
+                                return i;
+                        }
+
+                        for (cgltf_size k = 0; k < out_animation->samplers_count; ++k)
+                        {
+                                i = cgltf_parse_json_animation_sampler(options, tokens, i, json_chunk, &out_animation->samplers[k]);
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "channels") == 0)
+                {
+                        i = cgltf_parse_json_array(options, tokens, i + 1, json_chunk, sizeof(cgltf_animation_channel), (void**)&out_animation->channels, &out_animation->channels_count);
+                        if (i < 0)
+                        {
+                                return i;
+                        }
+
+                        for (cgltf_size k = 0; k < out_animation->channels_count; ++k)
+                        {
+                                i = cgltf_parse_json_animation_channel(options, tokens, i, json_chunk, &out_animation->channels[k]);
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_animation->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_animation->extensions_count, &out_animation->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+static int cgltf_parse_json_animations(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        i = cgltf_parse_json_array(options, tokens, i, json_chunk, sizeof(cgltf_animation), (void**)&out_data->animations, &out_data->animations_count);
+        if (i < 0)
+        {
+                return i;
+        }
+
+        for (cgltf_size j = 0; j < out_data->animations_count; ++j)
+        {
+                i = cgltf_parse_json_animation(options, tokens, i, json_chunk, &out_data->animations[j]);
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+        return i;
+}
+
+static int cgltf_parse_json_asset(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_asset* out_asset)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens+i, json_chunk, "copyright") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_asset->copyright);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "generator") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_asset->generator);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "version") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_asset->version);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "minVersion") == 0)
+                {
+                        i = cgltf_parse_json_string(options, tokens, i + 1, json_chunk, &out_asset->min_version);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_asset->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        i = cgltf_parse_json_unprocessed_extensions(options, tokens, i, json_chunk, &out_asset->extensions_count, &out_asset->extensions);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i+1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        if (out_asset->version && CGLTF_ATOF(out_asset->version) < 2)
+        {
+                return CGLTF_ERROR_LEGACY;
+        }
+
+        return i;
+}
+
+cgltf_size cgltf_num_components(cgltf_type type) {
+        switch (type)
+        {
+        case cgltf_type_vec2:
+                return 2;
+        case cgltf_type_vec3:
+                return 3;
+        case cgltf_type_vec4:
+                return 4;
+        case cgltf_type_mat2:
+                return 4;
+        case cgltf_type_mat3:
+                return 9;
+        case cgltf_type_mat4:
+                return 16;
+        case cgltf_type_invalid:
+        case cgltf_type_scalar:
+        default:
+                return 1;
+        }
+}
+
+static cgltf_size cgltf_component_size(cgltf_component_type component_type) {
+        switch (component_type)
+        {
+        case cgltf_component_type_r_8:
+        case cgltf_component_type_r_8u:
+                return 1;
+        case cgltf_component_type_r_16:
+        case cgltf_component_type_r_16u:
+                return 2;
+        case cgltf_component_type_r_32u:
+        case cgltf_component_type_r_32f:
+                return 4;
+        case cgltf_component_type_invalid:
+        default:
+                return 0;
+        }
+}
+
+static cgltf_size cgltf_calc_size(cgltf_type type, cgltf_component_type component_type)
+{
+        cgltf_size component_size = cgltf_component_size(component_type);
+        if (type == cgltf_type_mat2 && component_size == 1)
+        {
+                return 8 * component_size;
+        }
+        else if (type == cgltf_type_mat3 && (component_size == 1 || component_size == 2))
+        {
+                return 12 * component_size;
+        }
+        return component_size * cgltf_num_components(type);
+}
+
+static int cgltf_fixup_pointers(cgltf_data* out_data);
+
+static int cgltf_parse_json_root(cgltf_options* options, jsmntok_t const* tokens, int i, const uint8_t* json_chunk, cgltf_data* out_data)
+{
+        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+        int size = tokens[i].size;
+        ++i;
+
+        for (int j = 0; j < size; ++j)
+        {
+                CGLTF_CHECK_KEY(tokens[i]);
+
+                if (cgltf_json_strcmp(tokens + i, json_chunk, "asset") == 0)
+                {
+                        i = cgltf_parse_json_asset(options, tokens, i + 1, json_chunk, &out_data->asset);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "meshes") == 0)
+                {
+                        i = cgltf_parse_json_meshes(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "accessors") == 0)
+                {
+                        i = cgltf_parse_json_accessors(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "bufferViews") == 0)
+                {
+                        i = cgltf_parse_json_buffer_views(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "buffers") == 0)
+                {
+                        i = cgltf_parse_json_buffers(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "materials") == 0)
+                {
+                        i = cgltf_parse_json_materials(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "images") == 0)
+                {
+                        i = cgltf_parse_json_images(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "textures") == 0)
+                {
+                        i = cgltf_parse_json_textures(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "samplers") == 0)
+                {
+                        i = cgltf_parse_json_samplers(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "skins") == 0)
+                {
+                        i = cgltf_parse_json_skins(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "cameras") == 0)
+                {
+                        i = cgltf_parse_json_cameras(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "nodes") == 0)
+                {
+                        i = cgltf_parse_json_nodes(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "scenes") == 0)
+                {
+                        i = cgltf_parse_json_scenes(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "scene") == 0)
+                {
+                        ++i;
+                        out_data->scene = CGLTF_PTRINDEX(cgltf_scene, cgltf_json_to_int(tokens + i, json_chunk));
+                        ++i;
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "animations") == 0)
+                {
+                        i = cgltf_parse_json_animations(options, tokens, i + 1, json_chunk, out_data);
+                }
+                else if (cgltf_json_strcmp(tokens+i, json_chunk, "extras") == 0)
+                {
+                        i = cgltf_parse_json_extras(tokens, i + 1, json_chunk, &out_data->extras);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensions") == 0)
+                {
+                        ++i;
+
+                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+                        if(out_data->data_extensions)
+                        {
+                                return CGLTF_ERROR_JSON;
+                        }
+
+                        int extensions_size = tokens[i].size;
+                        out_data->data_extensions_count = 0;
+                        out_data->data_extensions = (cgltf_extension*)cgltf_calloc(options, sizeof(cgltf_extension), extensions_size);
+
+                        if (!out_data->data_extensions)
+                        {
+                                return CGLTF_ERROR_NOMEM;
+                        }
+
+                        ++i;
+
+                        for (int k = 0; k < extensions_size; ++k)
+                        {
+                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                if (cgltf_json_strcmp(tokens+i, json_chunk, "KHR_lights_punctual") == 0)
+                                {
+                                        ++i;
+
+                                        CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
+
+                                        int data_size = tokens[i].size;
+                                        ++i;
+
+                                        for (int m = 0; m < data_size; ++m)
+                                        {
+                                                CGLTF_CHECK_KEY(tokens[i]);
+
+                                                if (cgltf_json_strcmp(tokens + i, json_chunk, "lights") == 0)
+                                                {
+                                                        i = cgltf_parse_json_lights(options, tokens, i + 1, json_chunk, out_data);
+                                                }
+                                                else
+                                                {
+                                                        i = cgltf_skip_json(tokens, i + 1);
+                                                }
+
+                                                if (i < 0)
+                                                {
+                                                        return i;
+                                                }
+                                        }
+                                }
+                                else
+                                {
+                                        i = cgltf_parse_json_unprocessed_extension(options, tokens, i, json_chunk, &(out_data->data_extensions[out_data->data_extensions_count++]));
+                                }
+
+                                if (i < 0)
+                                {
+                                        return i;
+                                }
+                        }
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensionsUsed") == 0)
+                {
+                        i = cgltf_parse_json_string_array(options, tokens, i + 1, json_chunk, &out_data->extensions_used, &out_data->extensions_used_count);
+                }
+                else if (cgltf_json_strcmp(tokens + i, json_chunk, "extensionsRequired") == 0)
+                {
+                        i = cgltf_parse_json_string_array(options, tokens, i + 1, json_chunk, &out_data->extensions_required, &out_data->extensions_required_count);
+                }
+                else
+                {
+                        i = cgltf_skip_json(tokens, i + 1);
+                }
+
+                if (i < 0)
+                {
+                        return i;
+                }
+        }
+
+        return i;
+}
+
+cgltf_result cgltf_parse_json(cgltf_options* options, const uint8_t* json_chunk, cgltf_size size, cgltf_data** out_data)
+{
+        jsmn_parser parser = { 0, 0, 0 };
+
+        if (options->json_token_count == 0)
+        {
+                int token_count = jsmn_parse(&parser, (const char*)json_chunk, size, NULL, 0);
+
+                if (token_count <= 0)
+                {
+                        return cgltf_result_invalid_json;
+                }
+
+                options->json_token_count = token_count;
+        }
+
+        jsmntok_t* tokens = (jsmntok_t*)options->memory.alloc(options->memory.user_data, sizeof(jsmntok_t) * (options->json_token_count + 1));
+
+        if (!tokens)
+        {
+                return cgltf_result_out_of_memory;
+        }
+
+        jsmn_init(&parser);
+
+        int token_count = jsmn_parse(&parser, (const char*)json_chunk, size, tokens, options->json_token_count);
+
+        if (token_count <= 0)
+        {
+                options->memory.free(options->memory.user_data, tokens);
+                return cgltf_result_invalid_json;
+        }
+
+        // this makes sure that we always have an UNDEFINED token at the end of the stream
+        // for invalid JSON inputs this makes sure we don't perform out of bound reads of token data
+        tokens[token_count].type = JSMN_UNDEFINED;
+
+        cgltf_data* data = (cgltf_data*)options->memory.alloc(options->memory.user_data, sizeof(cgltf_data));
+
+        if (!data)
+        {
+                options->memory.free(options->memory.user_data, tokens);
+                return cgltf_result_out_of_memory;
+        }
+
+        memset(data, 0, sizeof(cgltf_data));
+        data->memory = options->memory;
+        data->file = options->file;
+
+        int i = cgltf_parse_json_root(options, tokens, 0, json_chunk, data);
+
+        options->memory.free(options->memory.user_data, tokens);
+
+        if (i < 0)
+        {
+                cgltf_free(data);
+
+                switch (i)
+                {
+                case CGLTF_ERROR_NOMEM: return cgltf_result_out_of_memory;
+                case CGLTF_ERROR_LEGACY: return cgltf_result_legacy_gltf;
+                default: return cgltf_result_invalid_gltf;
+                }
+        }
+
+        if (cgltf_fixup_pointers(data) < 0)
+        {
+                cgltf_free(data);
+                return cgltf_result_invalid_gltf;
+        }
+
+        data->json = (const char*)json_chunk;
+        data->json_size = size;
+
+        *out_data = data;
+
+        return cgltf_result_success;
+}
+
+static int cgltf_fixup_pointers(cgltf_data* data)
+{
+        for (cgltf_size i = 0; i < data->meshes_count; ++i)
+        {
+                for (cgltf_size j = 0; j < data->meshes[i].primitives_count; ++j)
+                {
+                        CGLTF_PTRFIXUP(data->meshes[i].primitives[j].indices, data->accessors, data->accessors_count);
+                        CGLTF_PTRFIXUP(data->meshes[i].primitives[j].material, data->materials, data->materials_count);
+
+                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].attributes_count; ++k)
+                        {
+                                CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].attributes[k].data, data->accessors, data->accessors_count);
+                        }
+
+                        for (cgltf_size k = 0; k < data->meshes[i].primitives[j].targets_count; ++k)
+                        {
+                                for (cgltf_size m = 0; m < data->meshes[i].primitives[j].targets[k].attributes_count; ++m)
+                                {
+                                        CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].targets[k].attributes[m].data, data->accessors, data->accessors_count);
+                                }
+                        }
+
+                        if (data->meshes[i].primitives[j].has_draco_mesh_compression)
+                        {
+                                CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].draco_mesh_compression.buffer_view, data->buffer_views, data->buffer_views_count);
+                                for (cgltf_size m = 0; m < data->meshes[i].primitives[j].draco_mesh_compression.attributes_count; ++m)
+                                {
+                                        CGLTF_PTRFIXUP_REQ(data->meshes[i].primitives[j].draco_mesh_compression.attributes[m].data, data->accessors, data->accessors_count);
+                                }
+                        }
+                }
+        }
+
+        for (cgltf_size i = 0; i < data->accessors_count; ++i)
+        {
+                CGLTF_PTRFIXUP(data->accessors[i].buffer_view, data->buffer_views, data->buffer_views_count);
+
+                if (data->accessors[i].is_sparse)
+                {
+                        CGLTF_PTRFIXUP_REQ(data->accessors[i].sparse.indices_buffer_view, data->buffer_views, data->buffer_views_count);
+                        CGLTF_PTRFIXUP_REQ(data->accessors[i].sparse.values_buffer_view, data->buffer_views, data->buffer_views_count);
+                }
+
+                if (data->accessors[i].buffer_view)
+                {
+                        data->accessors[i].stride = data->accessors[i].buffer_view->stride;
+                }
+
+                if (data->accessors[i].stride == 0)
+                {
+                        data->accessors[i].stride = cgltf_calc_size(data->accessors[i].type, data->accessors[i].component_type);
+                }
+        }
+
+        for (cgltf_size i = 0; i < data->textures_count; ++i)
+        {
+                CGLTF_PTRFIXUP(data->textures[i].image, data->images, data->images_count);
+                CGLTF_PTRFIXUP(data->textures[i].sampler, data->samplers, data->samplers_count);
+        }
+
+        for (cgltf_size i = 0; i < data->images_count; ++i)
+        {
+                CGLTF_PTRFIXUP(data->images[i].buffer_view, data->buffer_views, data->buffer_views_count);
+        }
+
+        for (cgltf_size i = 0; i < data->materials_count; ++i)
+        {
+                CGLTF_PTRFIXUP(data->materials[i].normal_texture.texture, data->textures, data->textures_count);
+                CGLTF_PTRFIXUP(data->materials[i].emissive_texture.texture, data->textures, data->textures_count);
+                CGLTF_PTRFIXUP(data->materials[i].occlusion_texture.texture, data->textures, data->textures_count);
+
+                CGLTF_PTRFIXUP(data->materials[i].pbr_metallic_roughness.base_color_texture.texture, data->textures, data->textures_count);
+                CGLTF_PTRFIXUP(data->materials[i].pbr_metallic_roughness.metallic_roughness_texture.texture, data->textures, data->textures_count);
+
+                CGLTF_PTRFIXUP(data->materials[i].pbr_specular_glossiness.diffuse_texture.texture, data->textures, data->textures_count);
+                CGLTF_PTRFIXUP(data->materials[i].pbr_specular_glossiness.specular_glossiness_texture.texture, data->textures, data->textures_count);
+
+                CGLTF_PTRFIXUP(data->materials[i].clearcoat.clearcoat_texture.texture, data->textures, data->textures_count);
+                CGLTF_PTRFIXUP(data->materials[i].clearcoat.clearcoat_roughness_texture.texture, data->textures, data->textures_count);
+                CGLTF_PTRFIXUP(data->materials[i].clearcoat.clearcoat_normal_texture.texture, data->textures, data->textures_count);
+
+                CGLTF_PTRFIXUP(data->materials[i].specular.specular_texture.texture, data->textures, data->textures_count);
+
+                CGLTF_PTRFIXUP(data->materials[i].transmission.transmission_texture.texture, data->textures, data->textures_count);
+        }
+
+        for (cgltf_size i = 0; i < data->buffer_views_count; ++i)
+        {
+                CGLTF_PTRFIXUP_REQ(data->buffer_views[i].buffer, data->buffers, data->buffers_count);
+        }
+
+        for (cgltf_size i = 0; i < data->skins_count; ++i)
+        {
+                for (cgltf_size j = 0; j < data->skins[i].joints_count; ++j)
+                {
+                        CGLTF_PTRFIXUP_REQ(data->skins[i].joints[j], data->nodes, data->nodes_count);
+                }
+
+                CGLTF_PTRFIXUP(data->skins[i].skeleton, data->nodes, data->nodes_count);
+                CGLTF_PTRFIXUP(data->skins[i].inverse_bind_matrices, data->accessors, data->accessors_count);
+        }
+
+        for (cgltf_size i = 0; i < data->nodes_count; ++i)
+        {
+                for (cgltf_size j = 0; j < data->nodes[i].children_count; ++j)
+                {
+                        CGLTF_PTRFIXUP_REQ(data->nodes[i].children[j], data->nodes, data->nodes_count);
+
+                        if (data->nodes[i].children[j]->parent)
+                        {
+                                return CGLTF_ERROR_JSON;
+                        }
+
+                        data->nodes[i].children[j]->parent = &data->nodes[i];
+                }
+
+                CGLTF_PTRFIXUP(data->nodes[i].mesh, data->meshes, data->meshes_count);
+                CGLTF_PTRFIXUP(data->nodes[i].skin, data->skins, data->skins_count);
+                CGLTF_PTRFIXUP(data->nodes[i].camera, data->cameras, data->cameras_count);
+                CGLTF_PTRFIXUP(data->nodes[i].light, data->lights, data->lights_count);
+        }
+
+        for (cgltf_size i = 0; i < data->scenes_count; ++i)
+        {
+                for (cgltf_size j = 0; j < data->scenes[i].nodes_count; ++j)
+                {
+                        CGLTF_PTRFIXUP_REQ(data->scenes[i].nodes[j], data->nodes, data->nodes_count);
+
+                        if (data->scenes[i].nodes[j]->parent)
+                        {
+                                return CGLTF_ERROR_JSON;
+                        }
+                }
+        }
+
+        CGLTF_PTRFIXUP(data->scene, data->scenes, data->scenes_count);
+
+        for (cgltf_size i = 0; i < data->animations_count; ++i)
+        {
+                for (cgltf_size j = 0; j < data->animations[i].samplers_count; ++j)
+                {
+                        CGLTF_PTRFIXUP_REQ(data->animations[i].samplers[j].input, data->accessors, data->accessors_count);
+                        CGLTF_PTRFIXUP_REQ(data->animations[i].samplers[j].output, data->accessors, data->accessors_count);
+                }
+
+                for (cgltf_size j = 0; j < data->animations[i].channels_count; ++j)
+                {
+                        CGLTF_PTRFIXUP_REQ(data->animations[i].channels[j].sampler, data->animations[i].samplers, data->animations[i].samplers_count);
+                        CGLTF_PTRFIXUP(data->animations[i].channels[j].target_node, data->nodes, data->nodes_count);
+                }
+        }
+
+        return 0;
+}
+
+/*
+ * -- jsmn.c start --
+ * Source: https://github.com/zserge/jsmn
+ * License: MIT
+ *
+ * Copyright (c) 2010 Serge A. Zaitsev
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * Allocates a fresh unused token from the token pull.
+ */
+static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser,
+                                   jsmntok_t *tokens, size_t num_tokens) {
+        jsmntok_t *tok;
+        if (parser->toknext >= num_tokens) {
+                return NULL;
+        }
+        tok = &tokens[parser->toknext++];
+        tok->start = tok->end = -1;
+        tok->size = 0;
+#ifdef JSMN_PARENT_LINKS
+        tok->parent = -1;
+#endif
+        return tok;
+}
+
+/**
+ * Fills token type and boundaries.
+ */
+static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type,
+                            int start, int end) {
+        token->type = type;
+        token->start = start;
+        token->end = end;
+        token->size = 0;
+}
+
+/**
+ * Fills next available token with JSON primitive.
+ */
+static int jsmn_parse_primitive(jsmn_parser *parser, const char *js,
+                                size_t len, jsmntok_t *tokens, size_t num_tokens) {
+        jsmntok_t *token;
+        int start;
+
+        start = parser->pos;
+
+        for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
+                switch (js[parser->pos]) {
+#ifndef JSMN_STRICT
+                /* In strict mode primitive must be followed by "," or "}" or "]" */
+                case ':':
+#endif
+                case '\t' : case '\r' : case '\n' : case ' ' :
+                case ','  : case ']'  : case '}' :
+                        goto found;
+                }
+                if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
+                        parser->pos = start;
+                        return JSMN_ERROR_INVAL;
+                }
+        }
+#ifdef JSMN_STRICT
+        /* In strict mode primitive must be followed by a comma/object/array */
+        parser->pos = start;
+        return JSMN_ERROR_PART;
+#endif
+
+found:
+        if (tokens == NULL) {
+                parser->pos--;
+                return 0;
+        }
+        token = jsmn_alloc_token(parser, tokens, num_tokens);
+        if (token == NULL) {
+                parser->pos = start;
+                return JSMN_ERROR_NOMEM;
+        }
+        jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
+#ifdef JSMN_PARENT_LINKS
+        token->parent = parser->toksuper;
+#endif
+        parser->pos--;
+        return 0;
+}
+
+/**
+ * Fills next token with JSON string.
+ */
+static int jsmn_parse_string(jsmn_parser *parser, const char *js,
+                             size_t len, jsmntok_t *tokens, size_t num_tokens) {
+        jsmntok_t *token;
+
+        int start = parser->pos;
+
+        parser->pos++;
+
+        /* Skip starting quote */
+        for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
+                char c = js[parser->pos];
+
+                /* Quote: end of string */
+                if (c == '\"') {
+                        if (tokens == NULL) {
+                                return 0;
+                        }
+                        token = jsmn_alloc_token(parser, tokens, num_tokens);
+                        if (token == NULL) {
+                                parser->pos = start;
+                                return JSMN_ERROR_NOMEM;
+                        }
+                        jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos);
+#ifdef JSMN_PARENT_LINKS
+                        token->parent = parser->toksuper;
+#endif
+                        return 0;
+                }
+
+                /* Backslash: Quoted symbol expected */
+                if (c == '\\' && parser->pos + 1 < len) {
+                        int i;
+                        parser->pos++;
+                        switch (js[parser->pos]) {
+                        /* Allowed escaped symbols */
+                        case '\"': case '/' : case '\\' : case 'b' :
+                        case 'f' : case 'r' : case 'n'  : case 't' :
+                                break;
+                                /* Allows escaped symbol \uXXXX */
+                        case 'u':
+                                parser->pos++;
+                                for(i = 0; i < 4 && parser->pos < len && js[parser->pos] != '\0'; i++) {
+                                        /* If it isn't a hex character we have an error */
+                                        if(!((js[parser->pos] >= 48 && js[parser->pos] <= 57) || /* 0-9 */
+                                             (js[parser->pos] >= 65 && js[parser->pos] <= 70) || /* A-F */
+                                             (js[parser->pos] >= 97 && js[parser->pos] <= 102))) { /* a-f */
+                                                parser->pos = start;
+                                                return JSMN_ERROR_INVAL;
+                                        }
+                                        parser->pos++;
+                                }
+                                parser->pos--;
+                                break;
+                                /* Unexpected symbol */
+                        default:
+                                parser->pos = start;
+                                return JSMN_ERROR_INVAL;
+                        }
+                }
+        }
+        parser->pos = start;
+        return JSMN_ERROR_PART;
+}
+
+/**
+ * Parse JSON string and fill tokens.
+ */
+static int jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
+               jsmntok_t *tokens, size_t num_tokens) {
+        int r;
+        int i;
+        jsmntok_t *token;
+        int count = parser->toknext;
+
+        for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
+                char c;
+                jsmntype_t type;
+
+                c = js[parser->pos];
+                switch (c) {
+                case '{': case '[':
+                        count++;
+                        if (tokens == NULL) {
+                                break;
+                        }
+                        token = jsmn_alloc_token(parser, tokens, num_tokens);
+                        if (token == NULL)
+                                return JSMN_ERROR_NOMEM;
+                        if (parser->toksuper != -1) {
+                                tokens[parser->toksuper].size++;
+#ifdef JSMN_PARENT_LINKS
+                                token->parent = parser->toksuper;
+#endif
+                        }
+                        token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
+                        token->start = parser->pos;
+                        parser->toksuper = parser->toknext - 1;
+                        break;
+                case '}': case ']':
+                        if (tokens == NULL)
+                                break;
+                        type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
+#ifdef JSMN_PARENT_LINKS
+                        if (parser->toknext < 1) {
+                                return JSMN_ERROR_INVAL;
+                        }
+                        token = &tokens[parser->toknext - 1];
+                        for (;;) {
+                                if (token->start != -1 && token->end == -1) {
+                                        if (token->type != type) {
+                                                return JSMN_ERROR_INVAL;
+                                        }
+                                        token->end = parser->pos + 1;
+                                        parser->toksuper = token->parent;
+                                        break;
+                                }
+                                if (token->parent == -1) {
+                                        if(token->type != type || parser->toksuper == -1) {
+                                                return JSMN_ERROR_INVAL;
+                                        }
+                                        break;
+                                }
+                                token = &tokens[token->parent];
+                        }
+#else
+                        for (i = parser->toknext - 1; i >= 0; i--) {
+                                token = &tokens[i];
+                                if (token->start != -1 && token->end == -1) {
+                                        if (token->type != type) {
+                                                return JSMN_ERROR_INVAL;
+                                        }
+                                        parser->toksuper = -1;
+                                        token->end = parser->pos + 1;
+                                        break;
+                                }
+                        }
+                        /* Error if unmatched closing bracket */
+                        if (i == -1) return JSMN_ERROR_INVAL;
+                        for (; i >= 0; i--) {
+                                token = &tokens[i];
+                                if (token->start != -1 && token->end == -1) {
+                                        parser->toksuper = i;
+                                        break;
+                                }
+                        }
+#endif
+                        break;
+                case '\"':
+                        r = jsmn_parse_string(parser, js, len, tokens, num_tokens);
+                        if (r < 0) return r;
+                        count++;
+                        if (parser->toksuper != -1 && tokens != NULL)
+                                tokens[parser->toksuper].size++;
+                        break;
+                case '\t' : case '\r' : case '\n' : case ' ':
+                        break;
+                case ':':
+                        parser->toksuper = parser->toknext - 1;
+                        break;
+                case ',':
+                        if (tokens != NULL && parser->toksuper != -1 &&
+                                        tokens[parser->toksuper].type != JSMN_ARRAY &&
+                                        tokens[parser->toksuper].type != JSMN_OBJECT) {
+#ifdef JSMN_PARENT_LINKS
+                                parser->toksuper = tokens[parser->toksuper].parent;
+#else
+                                for (i = parser->toknext - 1; i >= 0; i--) {
+                                        if (tokens[i].type == JSMN_ARRAY || tokens[i].type == JSMN_OBJECT) {
+                                                if (tokens[i].start != -1 && tokens[i].end == -1) {
+                                                        parser->toksuper = i;
+                                                        break;
+                                                }
+                                        }
+                                }
+#endif
+                        }
+                        break;
+#ifdef JSMN_STRICT
+                        /* In strict mode primitives are: numbers and booleans */
+                case '-': case '0': case '1' : case '2': case '3' : case '4':
+                case '5': case '6': case '7' : case '8': case '9':
+                case 't': case 'f': case 'n' :
+                        /* And they must not be keys of the object */
+                        if (tokens != NULL && parser->toksuper != -1) {
+                                jsmntok_t *t = &tokens[parser->toksuper];
+                                if (t->type == JSMN_OBJECT ||
+                                                (t->type == JSMN_STRING && t->size != 0)) {
+                                        return JSMN_ERROR_INVAL;
+                                }
+                        }
+#else
+                        /* In non-strict mode every unquoted value is a primitive */
+                default:
+#endif
+                        r = jsmn_parse_primitive(parser, js, len, tokens, num_tokens);
+                        if (r < 0) return r;
+                        count++;
+                        if (parser->toksuper != -1 && tokens != NULL)
+                                tokens[parser->toksuper].size++;
+                        break;
+
+#ifdef JSMN_STRICT
+                        /* Unexpected char in strict mode */
+                default:
+                        return JSMN_ERROR_INVAL;
+#endif
+                }
+        }
+
+        if (tokens != NULL) {
+                for (i = parser->toknext - 1; i >= 0; i--) {
+                        /* Unmatched opened object or array */
+                        if (tokens[i].start != -1 && tokens[i].end == -1) {
+                                return JSMN_ERROR_PART;
+                        }
+                }
+        }
+
+        return count;
+}
+
+/**
+ * Creates a new parser based over a given  buffer with an array of tokens
+ * available.
+ */
+static void jsmn_init(jsmn_parser *parser) {
+        parser->pos = 0;
+        parser->toknext = 0;
+        parser->toksuper = -1;
+}
+/*
+ * -- jsmn.c end --
+ */
+
+#endif /* #ifdef CGLTF_IMPLEMENTATION */
+
+/* cgltf is distributed under MIT license:
+ *
+ * Copyright (c) 2018 Johannes Kuhlmann
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
diff --git a/contrib/cgltf/cgltf_write.h b/contrib/cgltf/cgltf_write.h
new file mode 100644
index 0000000..2096a5b
--- /dev/null
+++ b/contrib/cgltf/cgltf_write.h
@@ -0,0 +1,1173 @@
+/**
+ * cgltf_write - a single-file glTF 2.0 writer written in C99.
+ *
+ * Version: 1.7
+ *
+ * Website: https://github.com/jkuhlmann/cgltf
+ *
+ * Distributed under the MIT License, see notice at the end of this file.
+ *
+ * Building:
+ * Include this file where you need the struct and function
+ * declarations. Have exactly one source file where you define
+ * `CGLTF_WRITE_IMPLEMENTATION` before including this file to get the
+ * function definitions.
+ *
+ * Reference:
+ * `cgltf_result cgltf_write_file(const cgltf_options* options, const char*
+ * path, const cgltf_data* data)` writes JSON to the given file path. Buffer
+ * files and external images are not written out. `data` is not deallocated.
+ *
+ * `cgltf_size cgltf_write(const cgltf_options* options, char* buffer,
+ * cgltf_size size, const cgltf_data* data)` writes JSON into the given memory
+ * buffer. Returns the number of bytes written to `buffer`, including a null
+ * terminator. If buffer is null, returns the number of bytes that would have
+ * been written. `data` is not deallocated.
+ *
+ * To write custom JSON into the `extras` field, aggregate all the custom JSON
+ * into a single buffer, then set `file_data` to this buffer. By supplying
+ * start_offset and end_offset values for various objects, you can select a
+ * range of characters within the aggregated buffer.
+ */
+#ifndef CGLTF_WRITE_H_INCLUDED__
+#define CGLTF_WRITE_H_INCLUDED__
+
+#include "cgltf.h"
+
+#include <stddef.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+cgltf_result cgltf_write_file(const cgltf_options* options, const char* path, const cgltf_data* data);
+cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size size, const cgltf_data* data);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* #ifndef CGLTF_WRITE_H_INCLUDED__ */
+
+/*
+ *
+ * Stop now, if you are only interested in the API.
+ * Below, you find the implementation.
+ *
+ */
+
+#if defined(__INTELLISENSE__) || defined(__JETBRAINS_IDE__)
+/* This makes MSVC/CLion intellisense work. */
+#define CGLTF_IMPLEMENTATION
+#endif
+
+#ifdef CGLTF_WRITE_IMPLEMENTATION
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define CGLTF_EXTENSION_FLAG_TEXTURE_TRANSFORM      (1 << 0)
+#define CGLTF_EXTENSION_FLAG_MATERIALS_UNLIT        (1 << 1)
+#define CGLTF_EXTENSION_FLAG_SPECULAR_GLOSSINESS    (1 << 2)
+#define CGLTF_EXTENSION_FLAG_LIGHTS_PUNCTUAL        (1 << 3)
+#define CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION (1 << 4)
+#define CGLTF_EXTENSION_FLAG_MATERIALS_CLEARCOAT    (1 << 5)
+#define CGLTF_EXTENSION_FLAG_MATERIALS_IOR          (1 << 6)
+#define CGLTF_EXTENSION_FLAG_MATERIALS_SPECULAR     (1 << 7)
+#define CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION (1 << 8)
+
+typedef struct {
+        char* buffer;
+        cgltf_size buffer_size;
+        cgltf_size remaining;
+        char* cursor;
+        cgltf_size tmp;
+        cgltf_size chars_written;
+        const cgltf_data* data;
+        int depth;
+        const char* indent;
+        int needs_comma;
+        uint32_t extension_flags;
+        uint32_t required_extension_flags;
+} cgltf_write_context;
+
+#define CGLTF_MIN(a, b) (a < b ? a : b)
+
+#define CGLTF_SPRINTF(...) { \
+                context->tmp = snprintf ( context->cursor, context->remaining, __VA_ARGS__ ); \
+                context->chars_written += context->tmp; \
+                if (context->cursor) { \
+                        context->cursor += context->tmp; \
+                        context->remaining -= context->tmp; \
+                } }
+
+#define CGLTF_SNPRINTF(length, ...) { \
+                context->tmp = snprintf ( context->cursor, CGLTF_MIN(length + 1, context->remaining), __VA_ARGS__ ); \
+                context->chars_written += length; \
+                if (context->cursor) { \
+                        context->cursor += length; \
+                        context->remaining -= length; \
+                } }
+
+#define CGLTF_WRITE_IDXPROP(label, val, start) if (val) { \
+                cgltf_write_indent(context); \
+                CGLTF_SPRINTF("\"%s\": %d", label, (int) (val - start)); \
+                context->needs_comma = 1; }
+
+#define CGLTF_WRITE_IDXARRPROP(label, dim, vals, start) if (vals) { \
+                cgltf_write_indent(context); \
+                CGLTF_SPRINTF("\"%s\": [", label); \
+                for (int i = 0; i < (int)(dim); ++i) { \
+                        int idx = (int) (vals[i] - start); \
+                        if (i != 0) CGLTF_SPRINTF(","); \
+                        CGLTF_SPRINTF(" %d", idx); \
+                } \
+                CGLTF_SPRINTF(" ]"); \
+                context->needs_comma = 1; }
+
+#define CGLTF_WRITE_TEXTURE_INFO(label, info) if (info.texture) { \
+                cgltf_write_line(context, "\"" label "\": {"); \
+                CGLTF_WRITE_IDXPROP("index", info.texture, context->data->textures); \
+                cgltf_write_intprop(context, "texCoord", info.texcoord, 0); \
+                cgltf_write_floatprop(context, "scale", info.scale, 1.0f); \
+                if (info.has_transform) { \
+                        context->extension_flags |= CGLTF_EXTENSION_FLAG_TEXTURE_TRANSFORM; \
+                        cgltf_write_texture_transform(context, &info.transform); \
+                } \
+                cgltf_write_extras(context, &info.extras); \
+                cgltf_write_line(context, "}"); }
+
+static void cgltf_write_indent(cgltf_write_context* context)
+{
+        if (context->needs_comma)
+        {
+                CGLTF_SPRINTF(",\n");
+                context->needs_comma = 0;
+        }
+        else
+        {
+                CGLTF_SPRINTF("\n");
+        }
+        for (int i = 0; i < context->depth; ++i)
+        {
+                CGLTF_SPRINTF("%s", context->indent);
+        }
+}
+
+static void cgltf_write_line(cgltf_write_context* context, const char* line)
+{
+        if (line[0] == ']' || line[0] == '}')
+        {
+                --context->depth;
+                context->needs_comma = 0;
+        }
+        cgltf_write_indent(context);
+        CGLTF_SPRINTF("%s", line);
+        cgltf_size last = (cgltf_size)(strlen(line) - 1);
+        if (line[0] == ']' || line[0] == '}')
+        {
+                context->needs_comma = 1;
+        }
+        if (line[last] == '[' || line[last] == '{')
+        {
+                ++context->depth;
+                context->needs_comma = 0;
+        }
+}
+
+static void cgltf_write_strprop(cgltf_write_context* context, const char* label, const char* val)
+{
+        if (val)
+        {
+                cgltf_write_indent(context);
+                CGLTF_SPRINTF("\"%s\": \"%s\"", label, val);
+                context->needs_comma = 1;
+        }
+}
+
+static void cgltf_write_extras(cgltf_write_context* context, const cgltf_extras* extras)
+{
+        cgltf_size length = extras->end_offset - extras->start_offset;
+        if (length > 0 && context->data->file_data)
+        {
+                char* json_string = ((char*) context->data->file_data) + extras->start_offset;
+                cgltf_write_indent(context);
+                CGLTF_SPRINTF("%s", "\"extras\": ");
+                CGLTF_SNPRINTF(length, "%s", json_string);
+                context->needs_comma = 1;
+        }
+}
+
+static void cgltf_write_stritem(cgltf_write_context* context, const char* item)
+{
+        cgltf_write_indent(context);
+        CGLTF_SPRINTF("\"%s\"", item);
+        context->needs_comma = 1;
+}
+
+static void cgltf_write_intprop(cgltf_write_context* context, const char* label, int val, int def)
+{
+        if (val != def)
+        {
+                cgltf_write_indent(context);
+                CGLTF_SPRINTF("\"%s\": %d", label, val);
+                context->needs_comma = 1;
+        }
+}
+
+static void cgltf_write_floatprop(cgltf_write_context* context, const char* label, float val, float def)
+{
+        if (val != def)
+        {
+                cgltf_write_indent(context);
+                CGLTF_SPRINTF("\"%s\": ", label);
+                CGLTF_SPRINTF("%g", val);
+                context->needs_comma = 1;
+
+                if (context->cursor)
+                {
+                        char *decimal_comma = strchr(context->cursor - context->tmp, ',');
+                        if (decimal_comma)
+                        {
+                                *decimal_comma = '.';
+                        }
+                }
+        }
+}
+
+static void cgltf_write_boolprop_optional(cgltf_write_context* context, const char* label, bool val, bool def)
+{
+        if (val != def)
+        {
+                cgltf_write_indent(context);
+                CGLTF_SPRINTF("\"%s\": %s", label, val ? "true" : "false");
+                context->needs_comma = 1;
+        }
+}
+
+static void cgltf_write_floatarrayprop(cgltf_write_context* context, const char* label, const cgltf_float* vals, cgltf_size dim)
+{
+        cgltf_write_indent(context);
+        CGLTF_SPRINTF("\"%s\": [", label);
+        for (cgltf_size i = 0; i < dim; ++i)
+        {
+                if (i != 0)
+                {
+                        CGLTF_SPRINTF(", %g", vals[i]);
+                }
+                else
+                {
+                        CGLTF_SPRINTF("%g", vals[i]);
+                }
+        }
+        CGLTF_SPRINTF("]");
+        context->needs_comma = 1;
+}
+
+static bool cgltf_check_floatarray(const float* vals, int dim, float val) {
+        while (dim--)
+        {
+                if (vals[dim] != val)
+                {
+                        return true;
+                }
+        }
+        return false;
+}
+
+static int cgltf_int_from_component_type(cgltf_component_type ctype)
+{
+        switch (ctype)
+        {
+                case cgltf_component_type_r_8: return 5120;
+                case cgltf_component_type_r_8u: return 5121;
+                case cgltf_component_type_r_16: return 5122;
+                case cgltf_component_type_r_16u: return 5123;
+                case cgltf_component_type_r_32u: return 5125;
+                case cgltf_component_type_r_32f: return 5126;
+                default: return 0;
+        }
+}
+
+static const char* cgltf_str_from_alpha_mode(cgltf_alpha_mode alpha_mode)
+{
+        switch (alpha_mode)
+        {
+                case cgltf_alpha_mode_mask: return "MASK";
+                case cgltf_alpha_mode_blend: return "BLEND";
+                default: return NULL;
+        }
+}
+
+static const char* cgltf_str_from_type(cgltf_type type)
+{
+        switch (type)
+        {
+                case cgltf_type_scalar: return "SCALAR";
+                case cgltf_type_vec2: return "VEC2";
+                case cgltf_type_vec3: return "VEC3";
+                case cgltf_type_vec4: return "VEC4";
+                case cgltf_type_mat2: return "MAT2";
+                case cgltf_type_mat3: return "MAT3";
+                case cgltf_type_mat4: return "MAT4";
+                default: return NULL;
+        }
+}
+
+static cgltf_size cgltf_dim_from_type(cgltf_type type)
+{
+        switch (type)
+        {
+                case cgltf_type_scalar: return 1;
+                case cgltf_type_vec2: return 2;
+                case cgltf_type_vec3: return 3;
+                case cgltf_type_vec4: return 4;
+                case cgltf_type_mat2: return 4;
+                case cgltf_type_mat3: return 9;
+                case cgltf_type_mat4: return 16;
+                default: return 0;
+        }
+}
+
+static const char* cgltf_str_from_camera_type(cgltf_camera_type camera_type)
+{
+        switch (camera_type)
+        {
+                case cgltf_camera_type_perspective: return "perspective";
+                case cgltf_camera_type_orthographic: return "orthographic";
+                default: return NULL;
+        }
+}
+
+static const char* cgltf_str_from_light_type(cgltf_light_type light_type)
+{
+        switch (light_type)
+        {
+                case cgltf_light_type_directional: return "directional";
+                case cgltf_light_type_point: return "point";
+                case cgltf_light_type_spot: return "spot";
+                default: return NULL;
+        }
+}
+
+static void cgltf_write_texture_transform(cgltf_write_context* context, const cgltf_texture_transform* transform)
+{
+        cgltf_write_line(context, "\"extensions\": {");
+        cgltf_write_line(context, "\"KHR_texture_transform\": {");
+        if (cgltf_check_floatarray(transform->offset, 2, 0.0f))
+        {
+                cgltf_write_floatarrayprop(context, "offset", transform->offset, 2);
+        }
+        cgltf_write_floatprop(context, "rotation", transform->rotation, 0.0f);
+        if (cgltf_check_floatarray(transform->scale, 2, 1.0f))
+        {
+                cgltf_write_floatarrayprop(context, "scale", transform->scale, 2);
+        }
+        cgltf_write_intprop(context, "texCoord", transform->texcoord, 0);
+        cgltf_write_line(context, "}");
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_asset(cgltf_write_context* context, const cgltf_asset* asset)
+{
+        cgltf_write_line(context, "\"asset\": {");
+        cgltf_write_strprop(context, "copyright", asset->copyright);
+        cgltf_write_strprop(context, "generator", asset->generator);
+        cgltf_write_strprop(context, "version", asset->version);
+        cgltf_write_strprop(context, "min_version", asset->min_version);
+        cgltf_write_extras(context, &asset->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_primitive(cgltf_write_context* context, const cgltf_primitive* prim)
+{
+        cgltf_write_intprop(context, "mode", (int) prim->type, 4);
+        CGLTF_WRITE_IDXPROP("indices", prim->indices, context->data->accessors);
+        CGLTF_WRITE_IDXPROP("material", prim->material, context->data->materials);
+        cgltf_write_line(context, "\"attributes\": {");
+        for (cgltf_size i = 0; i < prim->attributes_count; ++i)
+        {
+                const cgltf_attribute* attr = prim->attributes + i;
+                CGLTF_WRITE_IDXPROP(attr->name, attr->data, context->data->accessors);
+        }
+        cgltf_write_line(context, "}");
+
+        if (prim->targets_count)
+        {
+                cgltf_write_line(context, "\"targets\": [");
+                for (cgltf_size i = 0; i < prim->targets_count; ++i)
+                {
+                        cgltf_write_line(context, "{");
+                        for (cgltf_size j = 0; j < prim->targets[i].attributes_count; ++j)
+                        {
+                                const cgltf_attribute* attr = prim->targets[i].attributes + j;
+                                CGLTF_WRITE_IDXPROP(attr->name, attr->data, context->data->accessors);
+                        }
+                        cgltf_write_line(context, "}");
+                }
+                cgltf_write_line(context, "]");
+        }
+        cgltf_write_extras(context, &prim->extras);
+
+        cgltf_bool has_extensions = prim->has_draco_mesh_compression;
+        if (has_extensions) {
+                cgltf_write_line(context, "\"extensions\": {");
+
+                if (prim->has_draco_mesh_compression) {
+                        context->extension_flags |= CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION;
+                        if (prim->attributes_count == 0 || prim->indices == 0) {
+                                context->required_extension_flags |= CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION;                                
+                        }
+
+                        cgltf_write_line(context, "\"KHR_draco_mesh_compression\": {");
+                        CGLTF_WRITE_IDXPROP("bufferView", prim->draco_mesh_compression.buffer_view, context->data->buffer_views);
+                        cgltf_write_line(context, "\"attributes\": {");
+                        for (cgltf_size i = 0; i < prim->draco_mesh_compression.attributes_count; ++i)
+                        {
+                                const cgltf_attribute* attr = prim->draco_mesh_compression.attributes + i;
+                                CGLTF_WRITE_IDXPROP(attr->name, attr->data, context->data->accessors);
+                        }
+                        cgltf_write_line(context, "}");
+                        cgltf_write_line(context, "}");
+                }
+
+                cgltf_write_line(context, "}");
+        }
+}
+
+static void cgltf_write_mesh(cgltf_write_context* context, const cgltf_mesh* mesh)
+{
+        cgltf_write_line(context, "{");
+        cgltf_write_strprop(context, "name", mesh->name);
+
+        cgltf_write_line(context, "\"primitives\": [");
+        for (cgltf_size i = 0; i < mesh->primitives_count; ++i)
+        {
+                cgltf_write_line(context, "{");
+                cgltf_write_primitive(context, mesh->primitives + i);
+                cgltf_write_line(context, "}");
+        }
+        cgltf_write_line(context, "]");
+
+        if (mesh->weights_count > 0)
+        {
+                cgltf_write_floatarrayprop(context, "weights", mesh->weights, mesh->weights_count);
+        }
+        cgltf_write_extras(context, &mesh->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_buffer_view(cgltf_write_context* context, const cgltf_buffer_view* view)
+{
+        cgltf_write_line(context, "{");
+        CGLTF_WRITE_IDXPROP("buffer", view->buffer, context->data->buffers);
+        cgltf_write_intprop(context, "byteLength", (int)view->size, -1);
+        cgltf_write_intprop(context, "byteOffset", (int)view->offset, 0);
+        cgltf_write_intprop(context, "byteStride", (int)view->stride, 0);
+        // NOTE: We skip writing "target" because the spec says its usage can be inferred.
+        cgltf_write_extras(context, &view->extras);
+        cgltf_write_line(context, "}");
+}
+
+
+static void cgltf_write_buffer(cgltf_write_context* context, const cgltf_buffer* buffer)
+{
+        cgltf_write_line(context, "{");
+        cgltf_write_strprop(context, "uri", buffer->uri);
+        cgltf_write_intprop(context, "byteLength", (int)buffer->size, -1);
+        cgltf_write_extras(context, &buffer->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_material(cgltf_write_context* context, const cgltf_material* material)
+{
+        cgltf_write_line(context, "{");
+        cgltf_write_strprop(context, "name", material->name);
+        cgltf_write_floatprop(context, "alphaCutoff", material->alpha_cutoff, 0.5f);
+        cgltf_write_boolprop_optional(context, "doubleSided", material->double_sided, false);
+        // cgltf_write_boolprop_optional(context, "unlit", material->unlit, false);
+
+        if (material->unlit)
+        {
+                context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_UNLIT;
+        }
+
+        if (material->has_pbr_specular_glossiness)
+        {
+                context->extension_flags |= CGLTF_EXTENSION_FLAG_SPECULAR_GLOSSINESS;
+        }
+
+        if (material->has_clearcoat)
+        {
+                context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_CLEARCOAT;
+        }
+
+        if (material->has_transmission)
+        {
+                context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION;
+        }
+
+        if (material->has_ior)
+        {
+                context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_IOR;
+        }
+
+        if (material->has_specular)
+        {
+                context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_SPECULAR;
+        }
+
+        if (material->has_pbr_metallic_roughness)
+        {
+                const cgltf_pbr_metallic_roughness* params = &material->pbr_metallic_roughness;
+                cgltf_write_line(context, "\"pbrMetallicRoughness\": {");
+                CGLTF_WRITE_TEXTURE_INFO("baseColorTexture", params->base_color_texture);
+                CGLTF_WRITE_TEXTURE_INFO("metallicRoughnessTexture", params->metallic_roughness_texture);
+                cgltf_write_floatprop(context, "metallicFactor", params->metallic_factor, 1.0f);
+                cgltf_write_floatprop(context, "roughnessFactor", params->roughness_factor, 1.0f);
+                if (cgltf_check_floatarray(params->base_color_factor, 4, 1.0f))
+                {
+                        cgltf_write_floatarrayprop(context, "baseColorFactor", params->base_color_factor, 4);
+                }
+                cgltf_write_extras(context, &params->extras);
+                cgltf_write_line(context, "}");
+        }
+
+        if (material->unlit || material->has_pbr_specular_glossiness || material->has_clearcoat || material->has_ior || material->has_specular || material->has_transmission)
+        {
+                cgltf_write_line(context, "\"extensions\": {");
+                if (material->has_clearcoat)
+                {
+                        const cgltf_clearcoat* params = &material->clearcoat;
+                        cgltf_write_line(context, "\"KHR_materials_clearcoat\": {");
+                        CGLTF_WRITE_TEXTURE_INFO("clearcoatTexture", params->clearcoat_texture);
+                        CGLTF_WRITE_TEXTURE_INFO("clearcoatRoughnessTexture", params->clearcoat_roughness_texture);
+                        CGLTF_WRITE_TEXTURE_INFO("clearcoatNormalTexture", params->clearcoat_normal_texture);
+                        cgltf_write_floatprop(context, "clearcoatFactor", params->clearcoat_factor, 0.0f);
+                        cgltf_write_floatprop(context, "clearcoatRoughnessFactor", params->clearcoat_roughness_factor, 0.0f);
+                        cgltf_write_line(context, "}");
+                }
+                if (material->has_ior)
+                {
+                        const cgltf_ior* params = &material->ior;
+                        cgltf_write_line(context, "\"KHR_materials_ior\": {");
+                        cgltf_write_floatprop(context, "ior", params->ior, 1.5f);
+                        cgltf_write_line(context, "}");
+                }
+                if (material->has_specular)
+                {
+                        const cgltf_specular* params = &material->specular;
+                        cgltf_write_line(context, "\"KHR_materials_specular\": {");
+                        CGLTF_WRITE_TEXTURE_INFO("specularTexture", params->specular_texture);
+                        cgltf_write_floatprop(context, "specularFactor", params->specular_factor, 1.0f);
+                        if (cgltf_check_floatarray(params->specular_color_factor, 3, 1.0f))
+                        {
+                                cgltf_write_floatarrayprop(context, "specularColorFactor", params->specular_color_factor, 3);
+                        }
+                        cgltf_write_line(context, "}");
+                }
+                if (material->has_transmission)
+                {
+                        const cgltf_transmission* params = &material->transmission;
+                        cgltf_write_line(context, "\"KHR_materials_transmission\": {");
+                        CGLTF_WRITE_TEXTURE_INFO("transmissionTexture", params->transmission_texture);
+                        cgltf_write_floatprop(context, "transmissionFactor", params->transmission_factor, 0.0f);
+                        cgltf_write_line(context, "}");
+                }
+                if (material->has_pbr_specular_glossiness)
+                {
+                        const cgltf_pbr_specular_glossiness* params = &material->pbr_specular_glossiness;
+                        cgltf_write_line(context, "\"KHR_materials_pbrSpecularGlossiness\": {");
+                        CGLTF_WRITE_TEXTURE_INFO("diffuseTexture", params->diffuse_texture);
+                        CGLTF_WRITE_TEXTURE_INFO("specularGlossinessTexture", params->specular_glossiness_texture);
+                        if (cgltf_check_floatarray(params->diffuse_factor, 4, 1.0f))
+                        {
+                                cgltf_write_floatarrayprop(context, "dffuseFactor", params->diffuse_factor, 4);
+                        }
+                        if (cgltf_check_floatarray(params->specular_factor, 3, 1.0f))
+                        {
+                                cgltf_write_floatarrayprop(context, "specularFactor", params->specular_factor, 3);
+                        }
+                        cgltf_write_floatprop(context, "glossinessFactor", params->glossiness_factor, 1.0f);
+                        cgltf_write_line(context, "}");
+                }
+                if (material->unlit)
+                {
+                        cgltf_write_line(context, "\"KHR_materials_unlit\": {}");
+                }
+                cgltf_write_line(context, "}");
+        }
+
+        CGLTF_WRITE_TEXTURE_INFO("normalTexture", material->normal_texture);
+        CGLTF_WRITE_TEXTURE_INFO("occlusionTexture", material->occlusion_texture);
+        CGLTF_WRITE_TEXTURE_INFO("emissiveTexture", material->emissive_texture);
+        if (cgltf_check_floatarray(material->emissive_factor, 3, 0.0f))
+        {
+                cgltf_write_floatarrayprop(context, "emissiveFactor", material->emissive_factor, 3);
+        }
+        cgltf_write_strprop(context, "alphaMode", cgltf_str_from_alpha_mode(material->alpha_mode));
+        cgltf_write_extras(context, &material->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_image(cgltf_write_context* context, const cgltf_image* image)
+{
+        cgltf_write_line(context, "{");
+        cgltf_write_strprop(context, "name", image->name);
+        cgltf_write_strprop(context, "uri", image->uri);
+        CGLTF_WRITE_IDXPROP("bufferView", image->buffer_view, context->data->buffer_views);
+        cgltf_write_strprop(context, "mimeType", image->mime_type);
+        cgltf_write_extras(context, &image->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_texture(cgltf_write_context* context, const cgltf_texture* texture)
+{
+        cgltf_write_line(context, "{");
+        cgltf_write_strprop(context, "name", texture->name);
+        CGLTF_WRITE_IDXPROP("source", texture->image, context->data->images);
+        CGLTF_WRITE_IDXPROP("sampler", texture->sampler, context->data->samplers);
+        cgltf_write_extras(context, &texture->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_skin(cgltf_write_context* context, const cgltf_skin* skin)
+{
+        cgltf_write_line(context, "{");
+        CGLTF_WRITE_IDXPROP("skeleton", skin->skeleton, context->data->nodes);
+        CGLTF_WRITE_IDXPROP("inverseBindMatrices", skin->inverse_bind_matrices, context->data->accessors);
+        CGLTF_WRITE_IDXARRPROP("joints", skin->joints_count, skin->joints, context->data->nodes);
+        cgltf_write_strprop(context, "name", skin->name);
+        cgltf_write_extras(context, &skin->extras);
+        cgltf_write_line(context, "}");
+}
+
+static const char* cgltf_write_str_path_type(cgltf_animation_path_type path_type)
+{
+        switch (path_type)
+        {
+        case cgltf_animation_path_type_translation:
+                return "translation";
+        case cgltf_animation_path_type_rotation:
+                return "rotation";
+        case cgltf_animation_path_type_scale:
+                return "scale";
+        case cgltf_animation_path_type_weights:
+                return "weights";
+        case cgltf_animation_path_type_invalid:
+                break;
+        }
+        return "invalid";
+}
+
+static const char* cgltf_write_str_interpolation_type(cgltf_interpolation_type interpolation_type)
+{
+        switch (interpolation_type)
+        {
+        case cgltf_interpolation_type_linear:
+                return "LINEAR";
+        case cgltf_interpolation_type_step:
+                return "STEP";
+        case cgltf_interpolation_type_cubic_spline:
+                return "CUBICSPLINE";
+        }
+        return "invalid";
+}
+
+static void cgltf_write_path_type(cgltf_write_context* context, const char *label, cgltf_animation_path_type path_type)
+{
+        cgltf_write_strprop(context, label, cgltf_write_str_path_type(path_type));
+}
+
+static void cgltf_write_interpolation_type(cgltf_write_context* context, const char *label, cgltf_interpolation_type interpolation_type)
+{
+        cgltf_write_strprop(context, label, cgltf_write_str_interpolation_type(interpolation_type));
+}
+
+static void cgltf_write_animation_sampler(cgltf_write_context* context, const cgltf_animation_sampler* animation_sampler)
+{
+        cgltf_write_line(context, "{");
+        cgltf_write_interpolation_type(context, "interpolation", animation_sampler->interpolation);
+        CGLTF_WRITE_IDXPROP("input", animation_sampler->input, context->data->accessors);
+        CGLTF_WRITE_IDXPROP("output", animation_sampler->output, context->data->accessors);
+        cgltf_write_extras(context, &animation_sampler->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_animation_channel(cgltf_write_context* context, const cgltf_animation* animation, const cgltf_animation_channel* animation_channel)
+{
+        cgltf_write_line(context, "{");
+        CGLTF_WRITE_IDXPROP("sampler", animation_channel->sampler, animation->samplers);
+        cgltf_write_line(context, "\"target\": {");
+        CGLTF_WRITE_IDXPROP("node", animation_channel->target_node, context->data->nodes);
+        cgltf_write_path_type(context, "path", animation_channel->target_path);
+        cgltf_write_line(context, "}");
+        cgltf_write_extras(context, &animation_channel->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_animation(cgltf_write_context* context, const cgltf_animation* animation)
+{
+        cgltf_write_line(context, "{");
+        cgltf_write_strprop(context, "name", animation->name);
+
+        if (animation->samplers_count > 0)
+        {
+                cgltf_write_line(context, "\"samplers\": [");
+                for (cgltf_size i = 0; i < animation->samplers_count; ++i)
+                {
+                        cgltf_write_animation_sampler(context, animation->samplers + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+        if (animation->channels_count > 0)
+        {
+                cgltf_write_line(context, "\"channels\": [");
+                for (cgltf_size i = 0; i < animation->channels_count; ++i)
+                {
+                        cgltf_write_animation_channel(context, animation, animation->channels + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+        cgltf_write_extras(context, &animation->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_sampler(cgltf_write_context* context, const cgltf_sampler* sampler)
+{
+        cgltf_write_line(context, "{");
+        cgltf_write_intprop(context, "magFilter", sampler->mag_filter, 0);
+        cgltf_write_intprop(context, "minFilter", sampler->min_filter, 0);
+        cgltf_write_intprop(context, "wrapS", sampler->wrap_s, 10497);
+        cgltf_write_intprop(context, "wrapT", sampler->wrap_t, 10497);
+        cgltf_write_extras(context, &sampler->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_node(cgltf_write_context* context, const cgltf_node* node)
+{
+        cgltf_write_line(context, "{");
+        CGLTF_WRITE_IDXARRPROP("children", node->children_count, node->children, context->data->nodes);
+        CGLTF_WRITE_IDXPROP("mesh", node->mesh, context->data->meshes);
+        cgltf_write_strprop(context, "name", node->name);
+        if (node->has_matrix)
+        {
+                cgltf_write_floatarrayprop(context, "matrix", node->matrix, 16);
+        }
+        if (node->has_translation)
+        {
+                cgltf_write_floatarrayprop(context, "translation", node->translation, 3);
+        }
+        if (node->has_rotation)
+        {
+                cgltf_write_floatarrayprop(context, "rotation", node->rotation, 4);
+        }
+        if (node->has_scale)
+        {
+                cgltf_write_floatarrayprop(context, "scale", node->scale, 3);
+        }
+        if (node->skin)
+        {
+                CGLTF_WRITE_IDXPROP("skin", node->skin, context->data->skins);
+        }
+
+        if (node->light)
+        {
+                context->extension_flags |= CGLTF_EXTENSION_FLAG_LIGHTS_PUNCTUAL;
+                cgltf_write_line(context, "\"extensions\": {");
+                cgltf_write_line(context, "\"KHR_lights_punctual\": {");
+                CGLTF_WRITE_IDXPROP("light", node->light, context->data->lights);
+                cgltf_write_line(context, "}");
+                cgltf_write_line(context, "}");
+        }
+
+        if (node->weights_count > 0)
+        {
+                cgltf_write_floatarrayprop(context, "weights", node->weights, node->weights_count);
+        }
+
+        if (node->camera)
+        {
+                CGLTF_WRITE_IDXPROP("camera", node->camera, context->data->cameras);
+        }
+
+        cgltf_write_extras(context, &node->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_scene(cgltf_write_context* context, const cgltf_scene* scene)
+{
+        cgltf_write_line(context, "{");
+        cgltf_write_strprop(context, "name", scene->name);
+        CGLTF_WRITE_IDXARRPROP("nodes", scene->nodes_count, scene->nodes, context->data->nodes);
+        cgltf_write_extras(context, &scene->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_accessor(cgltf_write_context* context, const cgltf_accessor* accessor)
+{
+        cgltf_write_line(context, "{");
+        CGLTF_WRITE_IDXPROP("bufferView", accessor->buffer_view, context->data->buffer_views);
+        cgltf_write_intprop(context, "componentType", cgltf_int_from_component_type(accessor->component_type), 0);
+        cgltf_write_strprop(context, "type", cgltf_str_from_type(accessor->type));
+        cgltf_size dim = cgltf_dim_from_type(accessor->type);
+        cgltf_write_boolprop_optional(context, "normalized", accessor->normalized, false);
+        cgltf_write_intprop(context, "byteOffset", (int)accessor->offset, 0);
+        cgltf_write_intprop(context, "count", (int)accessor->count, -1);
+        if (accessor->has_min)
+        {
+                cgltf_write_floatarrayprop(context, "min", accessor->min, dim);
+        }
+        if (accessor->has_max)
+        {
+                cgltf_write_floatarrayprop(context, "max", accessor->max, dim);
+        }
+        if (accessor->is_sparse)
+        {
+                cgltf_write_line(context, "\"sparse\": {");
+                cgltf_write_intprop(context, "count", (int)accessor->sparse.count, 0);
+                cgltf_write_line(context, "\"indices\": {");
+                cgltf_write_intprop(context, "byteOffset", (int)accessor->sparse.indices_byte_offset, 0);
+                CGLTF_WRITE_IDXPROP("bufferView", accessor->sparse.indices_buffer_view, context->data->buffer_views);
+                cgltf_write_intprop(context, "componentType", cgltf_int_from_component_type(accessor->sparse.indices_component_type), 0);
+                cgltf_write_extras(context, &accessor->sparse.indices_extras);
+                cgltf_write_line(context, "}");
+                cgltf_write_line(context, "\"values\": {");
+                cgltf_write_intprop(context, "byteOffset", (int)accessor->sparse.values_byte_offset, 0);
+                CGLTF_WRITE_IDXPROP("bufferView", accessor->sparse.values_buffer_view, context->data->buffer_views);
+                cgltf_write_extras(context, &accessor->sparse.values_extras);
+                cgltf_write_line(context, "}");
+                cgltf_write_extras(context, &accessor->sparse.extras);
+                cgltf_write_line(context, "}");
+        }
+        cgltf_write_extras(context, &accessor->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_camera(cgltf_write_context* context, const cgltf_camera* camera)
+{
+        cgltf_write_line(context, "{");
+        cgltf_write_strprop(context, "type", cgltf_str_from_camera_type(camera->type));
+        if (camera->name)
+        {
+                cgltf_write_strprop(context, "name", camera->name);
+        }
+
+        if (camera->type == cgltf_camera_type_orthographic)
+        {
+                cgltf_write_line(context, "\"orthographic\": {");
+                cgltf_write_floatprop(context, "xmag", camera->data.orthographic.xmag, -1.0f);
+                cgltf_write_floatprop(context, "ymag", camera->data.orthographic.ymag, -1.0f);
+                cgltf_write_floatprop(context, "zfar", camera->data.orthographic.zfar, -1.0f);
+                cgltf_write_floatprop(context, "znear", camera->data.orthographic.znear, -1.0f);
+                cgltf_write_extras(context, &camera->data.orthographic.extras);
+                cgltf_write_line(context, "}");
+        }
+        else if (camera->type == cgltf_camera_type_perspective)
+        {
+                cgltf_write_line(context, "\"perspective\": {");
+                cgltf_write_floatprop(context, "aspectRatio", camera->data.perspective.aspect_ratio, -1.0f);
+                cgltf_write_floatprop(context, "yfov", camera->data.perspective.yfov, -1.0f);
+                cgltf_write_floatprop(context, "zfar", camera->data.perspective.zfar, -1.0f);
+                cgltf_write_floatprop(context, "znear", camera->data.perspective.znear, -1.0f);
+                cgltf_write_extras(context, &camera->data.perspective.extras);
+                cgltf_write_line(context, "}");
+        }
+        cgltf_write_extras(context, &camera->extras);
+        cgltf_write_line(context, "}");
+}
+
+static void cgltf_write_light(cgltf_write_context* context, const cgltf_light* light)
+{
+        cgltf_write_line(context, "{");
+        cgltf_write_strprop(context, "type", cgltf_str_from_light_type(light->type));
+        if (light->name)
+        {
+                cgltf_write_strprop(context, "name", light->name);
+        }
+        if (cgltf_check_floatarray(light->color, 3, 1.0f))
+        {
+                cgltf_write_floatarrayprop(context, "color", light->color, 3);
+        }
+        cgltf_write_floatprop(context, "intensity", light->intensity, 1.0f);
+        cgltf_write_floatprop(context, "range", light->range, 0.0f);
+
+        if (light->type == cgltf_light_type_spot)
+        {
+                cgltf_write_line(context, "\"spot\": {");
+                cgltf_write_floatprop(context, "innerConeAngle", light->spot_inner_cone_angle, 0.0f);
+                cgltf_write_floatprop(context, "outerConeAngle", light->spot_outer_cone_angle, 3.14159265358979323846f/4.0f);
+                cgltf_write_line(context, "}");
+        }
+        cgltf_write_line(context, "}");
+}
+
+cgltf_result cgltf_write_file(const cgltf_options* options, const char* path, const cgltf_data* data)
+{
+        cgltf_size expected = cgltf_write(options, NULL, 0, data);
+        char* buffer = (char*) malloc(expected);
+        cgltf_size actual = cgltf_write(options, buffer, expected, data);
+        if (expected != actual) {
+                fprintf(stderr, "Error: expected %zu bytes but wrote %zu bytes.\n", expected, actual);
+        }
+        FILE* file = fopen(path, "wt");
+        if (!file)
+        {
+                return cgltf_result_file_not_found;
+        }
+        // Note that cgltf_write() includes a null terminator, which we omit from the file content.
+        fwrite(buffer, actual - 1, 1, file);
+        fclose(file);
+        free(buffer);
+        return cgltf_result_success;
+}
+
+static void cgltf_write_extensions(cgltf_write_context* context, uint32_t extension_flags)
+{
+        if (extension_flags & CGLTF_EXTENSION_FLAG_TEXTURE_TRANSFORM) {
+                cgltf_write_stritem(context, "KHR_texture_transform");
+        }
+        if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_UNLIT) {
+                cgltf_write_stritem(context, "KHR_materials_unlit");
+        }
+        if (extension_flags & CGLTF_EXTENSION_FLAG_SPECULAR_GLOSSINESS) {
+                cgltf_write_stritem(context, "KHR_materials_pbrSpecularGlossiness");
+        }
+        if (extension_flags & CGLTF_EXTENSION_FLAG_LIGHTS_PUNCTUAL) {
+                cgltf_write_stritem(context, "KHR_lights_punctual");
+        }
+        if (extension_flags & CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION) {
+                cgltf_write_stritem(context, "KHR_draco_mesh_compression");
+        }
+        if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_CLEARCOAT) {
+                cgltf_write_stritem(context, "KHR_materials_clearcoat");
+        }
+        if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_IOR) {
+                cgltf_write_stritem(context, "KHR_materials_ior");
+        }
+        if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_SPECULAR) {
+                cgltf_write_stritem(context, "KHR_materials_specular");
+        }
+        if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION) {
+                cgltf_write_stritem(context, "KHR_materials_transmission");
+        }
+}
+
+cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size size, const cgltf_data* data)
+{
+        (void)options;
+        cgltf_write_context ctx;
+        ctx.buffer = buffer;
+        ctx.buffer_size = size;
+        ctx.remaining = size;
+        ctx.cursor = buffer;
+        ctx.chars_written = 0;
+        ctx.data = data;
+        ctx.depth = 1;
+        ctx.indent = "  ";
+        ctx.needs_comma = 0;
+        ctx.extension_flags = 0;
+        ctx.required_extension_flags = 0;
+
+        cgltf_write_context* context = &ctx;
+
+        CGLTF_SPRINTF("{");
+
+        if (data->accessors_count > 0)
+        {
+                cgltf_write_line(context, "\"accessors\": [");
+                for (cgltf_size i = 0; i < data->accessors_count; ++i)
+                {
+                        cgltf_write_accessor(context, data->accessors + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        cgltf_write_asset(context, &data->asset);
+
+        if (data->buffer_views_count > 0)
+        {
+                cgltf_write_line(context, "\"bufferViews\": [");
+                for (cgltf_size i = 0; i < data->buffer_views_count; ++i)
+                {
+                        cgltf_write_buffer_view(context, data->buffer_views + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        if (data->buffers_count > 0)
+        {
+                cgltf_write_line(context, "\"buffers\": [");
+                for (cgltf_size i = 0; i < data->buffers_count; ++i)
+                {
+                        cgltf_write_buffer(context, data->buffers + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        if (data->images_count > 0)
+        {
+                cgltf_write_line(context, "\"images\": [");
+                for (cgltf_size i = 0; i < data->images_count; ++i)
+                {
+                        cgltf_write_image(context, data->images + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        if (data->meshes_count > 0)
+        {
+                cgltf_write_line(context, "\"meshes\": [");
+                for (cgltf_size i = 0; i < data->meshes_count; ++i)
+                {
+                        cgltf_write_mesh(context, data->meshes + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        if (data->materials_count > 0)
+        {
+                cgltf_write_line(context, "\"materials\": [");
+                for (cgltf_size i = 0; i < data->materials_count; ++i)
+                {
+                        cgltf_write_material(context, data->materials + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        if (data->nodes_count > 0)
+        {
+                cgltf_write_line(context, "\"nodes\": [");
+                for (cgltf_size i = 0; i < data->nodes_count; ++i)
+                {
+                        cgltf_write_node(context, data->nodes + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        if (data->samplers_count > 0)
+        {
+                cgltf_write_line(context, "\"samplers\": [");
+                for (cgltf_size i = 0; i < data->samplers_count; ++i)
+                {
+                        cgltf_write_sampler(context, data->samplers + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        CGLTF_WRITE_IDXPROP("scene", data->scene, data->scenes);
+
+        if (data->scenes_count > 0)
+        {
+                cgltf_write_line(context, "\"scenes\": [");
+                for (cgltf_size i = 0; i < data->scenes_count; ++i)
+                {
+                        cgltf_write_scene(context, data->scenes + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        if (data->textures_count > 0)
+        {
+                cgltf_write_line(context, "\"textures\": [");
+                for (cgltf_size i = 0; i < data->textures_count; ++i)
+                {
+                        cgltf_write_texture(context, data->textures + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        if (data->skins_count > 0)
+        {
+                cgltf_write_line(context, "\"skins\": [");
+                for (cgltf_size i = 0; i < data->skins_count; ++i)
+                {
+                        cgltf_write_skin(context, data->skins + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        if (data->animations_count > 0)
+        {
+                cgltf_write_line(context, "\"animations\": [");
+                for (cgltf_size i = 0; i < data->animations_count; ++i)
+                {
+                        cgltf_write_animation(context, data->animations + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        if (data->cameras_count > 0)
+        {
+                cgltf_write_line(context, "\"cameras\": [");
+                for (cgltf_size i = 0; i < data->cameras_count; ++i)
+                {
+                        cgltf_write_camera(context, data->cameras + i);
+                }
+                cgltf_write_line(context, "]");
+        }
+
+        if (data->lights_count > 0)
+        {
+                cgltf_write_line(context, "\"extensions\": {");
+
+                cgltf_write_line(context, "\"KHR_lights_punctual\": {");
+                cgltf_write_line(context, "\"lights\": [");
+                for (cgltf_size i = 0; i < data->lights_count; ++i)
+                {
+                        cgltf_write_light(context, data->lights + i);
+                }
+                cgltf_write_line(context, "]");
+                cgltf_write_line(context, "}");
+
+                cgltf_write_line(context, "}");
+        }
+
+        if (context->extension_flags != 0) {
+                cgltf_write_line(context, "\"extensionsUsed\": [");
+                cgltf_write_extensions(context, context->extension_flags);
+                cgltf_write_line(context, "]");
+        }
+
+        if (context->required_extension_flags != 0) {
+                cgltf_write_line(context, "\"extensionsRequired\": [");
+                cgltf_write_extensions(context, context->required_extension_flags);
+                cgltf_write_line(context, "]");
+        }
+
+        cgltf_write_extras(context, &data->extras);
+
+        CGLTF_SPRINTF("\n}\n");
+
+        // snprintf does not include the null terminator in its return value, so be sure to include it
+        // in the returned byte count.
+        return 1 + ctx.chars_written;
+}
+
+#endif /* #ifdef CGLTF_WRITE_IMPLEMENTATION */
+
+/* cgltf is distributed under MIT license:
+ *
+ * Copyright (c) 2019 Philip Rideout
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
diff --git a/contrib/stb/CMakeLists.txt b/contrib/stb/CMakeLists.txt
new file mode 100644
index 0000000..8cee003
--- /dev/null
+++ b/contrib/stb/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.16)
+
+project(stb)
+
+add_library(stb INTERFACE)
+
+target_include_directories(stb INTERFACE
+  ${CMAKE_CURRENT_SOURCE_DIR})
diff --git a/contrib/stb/stb_image.h b/contrib/stb/stb_image.h
new file mode 100644
index 0000000..97038e6
--- /dev/null
+++ b/contrib/stb/stb_image.h
@@ -0,0 +1,7762 @@
+/* stb_image - v2.26 - public domain image loader - http://nothings.org/stb
+                                  no warranty implied; use at your own risk
+
+   Do this:
+      #define STB_IMAGE_IMPLEMENTATION
+   before you include this file in *one* C or C++ file to create the implementation.
+
+   // i.e. it should look like this:
+   #include ...
+   #include ...
+   #include ...
+   #define STB_IMAGE_IMPLEMENTATION
+   #include "stb_image.h"
+
+   You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
+   And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free
+
+
+   QUICK NOTES:
+      Primarily of interest to game developers and other people who can
+          avoid problematic images and only need the trivial interface
+
+      JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib)
+      PNG 1/2/4/8/16-bit-per-channel
+
+      TGA (not sure what subset, if a subset)
+      BMP non-1bpp, non-RLE
+      PSD (composited view only, no extra channels, 8/16 bit-per-channel)
+
+      GIF (*comp always reports as 4-channel)
+      HDR (radiance rgbE format)
+      PIC (Softimage PIC)
+      PNM (PPM and PGM binary only)
+
+      Animated GIF still needs a proper API, but here's one way to do it:
+          http://gist.github.com/urraka/685d9a6340b26b830d49
+
+      - decode from memory or through FILE (define STBI_NO_STDIO to remove code)
+      - decode from arbitrary I/O callbacks
+      - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON)
+
+   Full documentation under "DOCUMENTATION" below.
+
+
+LICENSE
+
+  See end of file for license information.
+
+RECENT REVISION HISTORY:
+
+      2.26  (2020-07-13) many minor fixes
+      2.25  (2020-02-02) fix warnings
+      2.24  (2020-02-02) fix warnings; thread-local failure_reason and flip_vertically
+      2.23  (2019-08-11) fix clang static analysis warning
+      2.22  (2019-03-04) gif fixes, fix warnings
+      2.21  (2019-02-25) fix typo in comment
+      2.20  (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs
+      2.19  (2018-02-11) fix warning
+      2.18  (2018-01-30) fix warnings
+      2.17  (2018-01-29) bugfix, 1-bit BMP, 16-bitness query, fix warnings
+      2.16  (2017-07-23) all functions have 16-bit variants; optimizations; bugfixes
+      2.15  (2017-03-18) fix png-1,2,4; all Imagenet JPGs; no runtime SSE detection on GCC
+      2.14  (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs
+      2.13  (2016-12-04) experimental 16-bit API, only for PNG so far; fixes
+      2.12  (2016-04-02) fix typo in 2.11 PSD fix that caused crashes
+      2.11  (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64
+                         RGB-format JPEG; remove white matting in PSD;
+                         allocate large structures on the stack;
+                         correct channel count for PNG & BMP
+      2.10  (2016-01-22) avoid warning introduced in 2.09
+      2.09  (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED
+
+   See end of file for full revision history.
+
+
+ ============================    Contributors    =========================
+
+ Image formats                          Extensions, features
+    Sean Barrett (jpeg, png, bmp)          Jetro Lauha (stbi_info)
+    Nicolas Schulz (hdr, psd)              Martin "SpartanJ" Golini (stbi_info)
+    Jonathan Dummer (tga)                  James "moose2000" Brown (iPhone PNG)
+    Jean-Marc Lienher (gif)                Ben "Disch" Wenger (io callbacks)
+    Tom Seddon (pic)                       Omar Cornut (1/2/4-bit PNG)
+    Thatcher Ulrich (psd)                  Nicolas Guillemot (vertical flip)
+    Ken Miller (pgm, ppm)                  Richard Mitton (16-bit PSD)
+    github:urraka (animated gif)           Junggon Kim (PNM comments)
+    Christopher Forseth (animated gif)     Daniel Gibson (16-bit TGA)
+                                           socks-the-fox (16-bit PNG)
+                                           Jeremy Sawicki (handle all ImageNet JPGs)
+ Optimizations & bugfixes                  Mikhail Morozov (1-bit BMP)
+    Fabian "ryg" Giesen                    Anael Seghezzi (is-16-bit query)
+    Arseny Kapoulkine
+    John-Mark Allen
+    Carmelo J Fdez-Aguera
+
+ Bug & warning fixes
+    Marc LeBlanc            David Woo          Guillaume George     Martins Mozeiko
+    Christpher Lloyd        Jerry Jansson      Joseph Thomson       Blazej Dariusz Roszkowski
+    Phil Jordan                                Dave Moore           Roy Eltham
+    Hayaki Saito            Nathan Reed        Won Chun
+    Luke Graham             Johan Duparc       Nick Verigakis       the Horde3D community
+    Thomas Ruf              Ronny Chevalier                         github:rlyeh
+    Janez Zemva             John Bartholomew   Michal Cichon        github:romigrou
+    Jonathan Blow           Ken Hamada         Tero Hanninen        github:svdijk
+                            Laurent Gomila     Cort Stratton        github:snagar
+    Aruelien Pocheville     Sergio Gonzalez    Thibault Reuille     github:Zelex
+    Cass Everitt            Ryamond Barbiero                        github:grim210
+    Paul Du Bois            Engin Manap        Aldo Culquicondor    github:sammyhw
+    Philipp Wiesemann       Dale Weiler        Oriol Ferrer Mesia   github:phprus
+    Josh Tobin                                 Matthew Gregan       github:poppolopoppo
+    Julian Raschke          Gregory Mullen     Christian Floisand   github:darealshinji
+    Baldur Karlsson         Kevin Schmidt      JR Smith             github:Michaelangel007
+                            Brad Weinberger    Matvey Cherevko      [reserved]
+    Luca Sas                Alexander Veselov  Zack Middleton       [reserved]
+    Ryan C. Gordon          [reserved]                              [reserved]
+                     DO NOT ADD YOUR NAME HERE
+
+  To add your name to the credits, pick a random blank space in the middle and fill it.
+  80% of merge conflicts on stb PRs are due to people adding their name at the end
+  of the credits.
+*/
+
+#ifndef STBI_INCLUDE_STB_IMAGE_H
+#define STBI_INCLUDE_STB_IMAGE_H
+
+// DOCUMENTATION
+//
+// Limitations:
+//    - no 12-bit-per-channel JPEG
+//    - no JPEGs with arithmetic coding
+//    - GIF always returns *comp=4
+//
+// Basic usage (see HDR discussion below for HDR usage):
+//    int x,y,n;
+//    unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
+//    // ... process data if not NULL ...
+//    // ... x = width, y = height, n = # 8-bit components per pixel ...
+//    // ... replace '0' with '1'..'4' to force that many components per pixel
+//    // ... but 'n' will always be the number that it would have been if you said 0
+//    stbi_image_free(data)
+//
+// Standard parameters:
+//    int *x                 -- outputs image width in pixels
+//    int *y                 -- outputs image height in pixels
+//    int *channels_in_file  -- outputs # of image components in image file
+//    int desired_channels   -- if non-zero, # of image components requested in result
+//
+// The return value from an image loader is an 'unsigned char *' which points
+// to the pixel data, or NULL on an allocation failure or if the image is
+// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels,
+// with each pixel consisting of N interleaved 8-bit components; the first
+// pixel pointed to is top-left-most in the image. There is no padding between
+// image scanlines or between pixels, regardless of format. The number of
+// components N is 'desired_channels' if desired_channels is non-zero, or
+// *channels_in_file otherwise. If desired_channels is non-zero,
+// *channels_in_file has the number of components that _would_ have been
+// output otherwise. E.g. if you set desired_channels to 4, you will always
+// get RGBA output, but you can check *channels_in_file to see if it's trivially
+// opaque because e.g. there were only 3 channels in the source image.
+//
+// An output image with N components has the following components interleaved
+// in this order in each pixel:
+//
+//     N=#comp     components
+//       1           grey
+//       2           grey, alpha
+//       3           red, green, blue
+//       4           red, green, blue, alpha
+//
+// If image loading fails for any reason, the return value will be NULL,
+// and *x, *y, *channels_in_file will be unchanged. The function
+// stbi_failure_reason() can be queried for an extremely brief, end-user
+// unfriendly explanation of why the load failed. Define STBI_NO_FAILURE_STRINGS
+// to avoid compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly
+// more user-friendly ones.
+//
+// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
+//
+// ===========================================================================
+//
+// UNICODE:
+//
+//   If compiling for Windows and you wish to use Unicode filenames, compile
+//   with
+//       #define STBI_WINDOWS_UTF8
+//   and pass utf8-encoded filenames. Call stbi_convert_wchar_to_utf8 to convert
+//   Windows wchar_t filenames to utf8.
+//
+// ===========================================================================
+//
+// Philosophy
+//
+// stb libraries are designed with the following priorities:
+//
+//    1. easy to use
+//    2. easy to maintain
+//    3. good performance
+//
+// Sometimes I let "good performance" creep up in priority over "easy to maintain",
+// and for best performance I may provide less-easy-to-use APIs that give higher
+// performance, in addition to the easy-to-use ones. Nevertheless, it's important
+// to keep in mind that from the standpoint of you, a client of this library,
+// all you care about is #1 and #3, and stb libraries DO NOT emphasize #3 above all.
+//
+// Some secondary priorities arise directly from the first two, some of which
+// provide more explicit reasons why performance can't be emphasized.
+//
+//    - Portable ("ease of use")
+//    - Small source code footprint ("easy to maintain")
+//    - No dependencies ("ease of use")
+//
+// ===========================================================================
+//
+// I/O callbacks
+//
+// I/O callbacks allow you to read from arbitrary sources, like packaged
+// files or some other source. Data read from callbacks are processed
+// through a small internal buffer (currently 128 bytes) to try to reduce
+// overhead.
+//
+// The three functions you must define are "read" (reads some bytes of data),
+// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end).
+//
+// ===========================================================================
+//
+// SIMD support
+//
+// The JPEG decoder will try to automatically use SIMD kernels on x86 when
+// supported by the compiler. For ARM Neon support, you must explicitly
+// request it.
+//
+// (The old do-it-yourself SIMD API is no longer supported in the current
+// code.)
+//
+// On x86, SSE2 will automatically be used when available based on a run-time
+// test; if not, the generic C versions are used as a fall-back. On ARM targets,
+// the typical path is to have separate builds for NEON and non-NEON devices
+// (at least this is true for iOS and Android). Therefore, the NEON support is
+// toggled by a build flag: define STBI_NEON to get NEON loops.
+//
+// If for some reason you do not want to use any of SIMD code, or if
+// you have issues compiling it, you can disable it entirely by
+// defining STBI_NO_SIMD.
+//
+// ===========================================================================
+//
+// HDR image support   (disable by defining STBI_NO_HDR)
+//
+// stb_image supports loading HDR images in general, and currently the Radiance
+// .HDR file format specifically. You can still load any file through the existing
+// interface; if you attempt to load an HDR file, it will be automatically remapped
+// to LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1;
+// both of these constants can be reconfigured through this interface:
+//
+//     stbi_hdr_to_ldr_gamma(2.2f);
+//     stbi_hdr_to_ldr_scale(1.0f);
+//
+// (note, do not use _inverse_ constants; stbi_image will invert them
+// appropriately).
+//
+// Additionally, there is a new, parallel interface for loading files as
+// (linear) floats to preserve the full dynamic range:
+//
+//    float *data = stbi_loadf(filename, &x, &y, &n, 0);
+//
+// If you load LDR images through this interface, those images will
+// be promoted to floating point values, run through the inverse of
+// constants corresponding to the above:
+//
+//     stbi_ldr_to_hdr_scale(1.0f);
+//     stbi_ldr_to_hdr_gamma(2.2f);
+//
+// Finally, given a filename (or an open file or memory block--see header
+// file for details) containing image data, you can query for the "most
+// appropriate" interface to use (that is, whether the image is HDR or
+// not), using:
+//
+//     stbi_is_hdr(char *filename);
+//
+// ===========================================================================
+//
+// iPhone PNG support:
+//
+// By default we convert iphone-formatted PNGs back to RGB, even though
+// they are internally encoded differently. You can disable this conversion
+// by calling stbi_convert_iphone_png_to_rgb(0), in which case
+// you will always just get the native iphone "format" through (which
+// is BGR stored in RGB).
+//
+// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per
+// pixel to remove any premultiplied alpha *only* if the image file explicitly
+// says there's premultiplied data (currently only happens in iPhone images,
+// and only if iPhone convert-to-rgb processing is on).
+//
+// ===========================================================================
+//
+// ADDITIONAL CONFIGURATION
+//
+//  - You can suppress implementation of any of the decoders to reduce
+//    your code footprint by #defining one or more of the following
+//    symbols before creating the implementation.
+//
+//        STBI_NO_JPEG
+//        STBI_NO_PNG
+//        STBI_NO_BMP
+//        STBI_NO_PSD
+//        STBI_NO_TGA
+//        STBI_NO_GIF
+//        STBI_NO_HDR
+//        STBI_NO_PIC
+//        STBI_NO_PNM   (.ppm and .pgm)
+//
+//  - You can request *only* certain decoders and suppress all other ones
+//    (this will be more forward-compatible, as addition of new decoders
+//    doesn't require you to disable them explicitly):
+//
+//        STBI_ONLY_JPEG
+//        STBI_ONLY_PNG
+//        STBI_ONLY_BMP
+//        STBI_ONLY_PSD
+//        STBI_ONLY_TGA
+//        STBI_ONLY_GIF
+//        STBI_ONLY_HDR
+//        STBI_ONLY_PIC
+//        STBI_ONLY_PNM   (.ppm and .pgm)
+//
+//   - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still
+//     want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB
+//
+//  - If you define STBI_MAX_DIMENSIONS, stb_image will reject images greater
+//    than that size (in either width or height) without further processing.
+//    This is to let programs in the wild set an upper bound to prevent
+//    denial-of-service attacks on untrusted data, as one could generate a
+//    valid image of gigantic dimensions and force stb_image to allocate a
+//    huge block of memory and spend disproportionate time decoding it. By
+//    default this is set to (1 << 24), which is 16777216, but that's still
+//    very big.
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif // STBI_NO_STDIO
+
+#define STBI_VERSION 1
+
+enum
+{
+   STBI_default = 0, // only used for desired_channels
+
+   STBI_grey       = 1,
+   STBI_grey_alpha = 2,
+   STBI_rgb        = 3,
+   STBI_rgb_alpha  = 4
+};
+
+#include <stdlib.h>
+typedef unsigned char stbi_uc;
+typedef unsigned short stbi_us;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef STBIDEF
+#ifdef STB_IMAGE_STATIC
+#define STBIDEF static
+#else
+#define STBIDEF extern
+#endif
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// PRIMARY API - works on images of any type
+//
+
+//
+// load image by filename, open file, or memory buffer
+//
+
+typedef struct
+{
+   int      (*read)  (void *user,char *data,int size);   // fill 'data' with 'size' bytes.  return number of bytes actually read
+   void     (*skip)  (void *user,int n);                 // skip the next 'n' bytes, or 'unget' the last -n bytes if negative
+   int      (*eof)   (void *user);                       // returns nonzero if we are at end of file/data
+} stbi_io_callbacks;
+
+////////////////////////////////////
+//
+// 8-bits-per-channel interface
+//
+
+STBIDEF stbi_uc *stbi_load_from_memory   (stbi_uc           const *buffer, int len   , int *x, int *y, int *channels_in_file, int desired_channels);
+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk  , void *user, int *x, int *y, int *channels_in_file, int desired_channels);
+
+#ifndef STBI_NO_STDIO
+STBIDEF stbi_uc *stbi_load            (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
+STBIDEF stbi_uc *stbi_load_from_file  (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
+// for stbi_load_from_file, file pointer is left pointing immediately after image
+#endif
+
+#ifndef STBI_NO_GIF
+STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp);
+#endif
+
+#ifdef STBI_WINDOWS_UTF8
+STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input);
+#endif
+
+////////////////////////////////////
+//
+// 16-bits-per-channel interface
+//
+
+STBIDEF stbi_us *stbi_load_16_from_memory   (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels);
+STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels);
+
+#ifndef STBI_NO_STDIO
+STBIDEF stbi_us *stbi_load_16          (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
+STBIDEF stbi_us *stbi_load_from_file_16(FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
+#endif
+
+////////////////////////////////////
+//
+// float-per-channel interface
+//
+#ifndef STBI_NO_LINEAR
+   STBIDEF float *stbi_loadf_from_memory     (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels);
+   STBIDEF float *stbi_loadf_from_callbacks  (stbi_io_callbacks const *clbk, void *user, int *x, int *y,  int *channels_in_file, int desired_channels);
+
+   #ifndef STBI_NO_STDIO
+   STBIDEF float *stbi_loadf            (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
+   STBIDEF float *stbi_loadf_from_file  (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
+   #endif
+#endif
+
+#ifndef STBI_NO_HDR
+   STBIDEF void   stbi_hdr_to_ldr_gamma(float gamma);
+   STBIDEF void   stbi_hdr_to_ldr_scale(float scale);
+#endif // STBI_NO_HDR
+
+#ifndef STBI_NO_LINEAR
+   STBIDEF void   stbi_ldr_to_hdr_gamma(float gamma);
+   STBIDEF void   stbi_ldr_to_hdr_scale(float scale);
+#endif // STBI_NO_LINEAR
+
+// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR
+STBIDEF int    stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
+STBIDEF int    stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
+#ifndef STBI_NO_STDIO
+STBIDEF int      stbi_is_hdr          (char const *filename);
+STBIDEF int      stbi_is_hdr_from_file(FILE *f);
+#endif // STBI_NO_STDIO
+
+
+// get a VERY brief reason for failure
+// on most compilers (and ALL modern mainstream compilers) this is threadsafe
+STBIDEF const char *stbi_failure_reason  (void);
+
+// free the loaded image -- this is just free()
+STBIDEF void     stbi_image_free      (void *retval_from_stbi_load);
+
+// get image dimensions & components without fully decoding
+STBIDEF int      stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
+STBIDEF int      stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp);
+STBIDEF int      stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len);
+STBIDEF int      stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *clbk, void *user);
+
+#ifndef STBI_NO_STDIO
+STBIDEF int      stbi_info               (char const *filename,     int *x, int *y, int *comp);
+STBIDEF int      stbi_info_from_file     (FILE *f,                  int *x, int *y, int *comp);
+STBIDEF int      stbi_is_16_bit          (char const *filename);
+STBIDEF int      stbi_is_16_bit_from_file(FILE *f);
+#endif
+
+
+
+// for image formats that explicitly notate that they have premultiplied alpha,
+// we just return the colors as stored in the file. set this flag to force
+// unpremultiplication. results are undefined if the unpremultiply overflow.
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
+
+// indicate whether we should process iphone images back to canonical format,
+// or just pass them through "as-is"
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
+
+// flip the image vertically, so the first pixel in the output array is the bottom left
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip);
+
+// as above, but only applies to images loaded on the thread that calls the function
+// this function is only available if your compiler supports thread-local variables;
+// calling it will fail to link if your compiler doesn't
+STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip);
+
+// ZLIB client - used by PNG, available for other purposes
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header);
+STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
+STBIDEF int   stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+
+STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
+STBIDEF int   stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+//
+//
+////   end header file   /////////////////////////////////////////////////////
+#endif // STBI_INCLUDE_STB_IMAGE_H
+
+#ifdef STB_IMAGE_IMPLEMENTATION
+
+#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \
+  || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \
+  || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \
+  || defined(STBI_ONLY_ZLIB)
+   #ifndef STBI_ONLY_JPEG
+   #define STBI_NO_JPEG
+   #endif
+   #ifndef STBI_ONLY_PNG
+   #define STBI_NO_PNG
+   #endif
+   #ifndef STBI_ONLY_BMP
+   #define STBI_NO_BMP
+   #endif
+   #ifndef STBI_ONLY_PSD
+   #define STBI_NO_PSD
+   #endif
+   #ifndef STBI_ONLY_TGA
+   #define STBI_NO_TGA
+   #endif
+   #ifndef STBI_ONLY_GIF
+   #define STBI_NO_GIF
+   #endif
+   #ifndef STBI_ONLY_HDR
+   #define STBI_NO_HDR
+   #endif
+   #ifndef STBI_ONLY_PIC
+   #define STBI_NO_PIC
+   #endif
+   #ifndef STBI_ONLY_PNM
+   #define STBI_NO_PNM
+   #endif
+#endif
+
+#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB)
+#define STBI_NO_ZLIB
+#endif
+
+
+#include <stdarg.h>
+#include <stddef.h> // ptrdiff_t on osx
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+#include <math.h>  // ldexp, pow
+#endif
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif
+
+#ifndef STBI_ASSERT
+#include <assert.h>
+#define STBI_ASSERT(x) assert(x)
+#endif
+
+#ifdef __cplusplus
+#define STBI_EXTERN extern "C"
+#else
+#define STBI_EXTERN extern
+#endif
+
+
+#ifndef _MSC_VER
+   #ifdef __cplusplus
+   #define stbi_inline inline
+   #else
+   #define stbi_inline
+   #endif
+#else
+   #define stbi_inline __forceinline
+#endif
+
+#ifndef STBI_NO_THREAD_LOCALS
+   #if defined(__cplusplus) &&  __cplusplus >= 201103L
+      #define STBI_THREAD_LOCAL       thread_local
+   #elif defined(__GNUC__) && __GNUC__ < 5
+      #define STBI_THREAD_LOCAL       __thread
+   #elif defined(_MSC_VER)
+      #define STBI_THREAD_LOCAL       __declspec(thread)
+   #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_THREADS__)
+      #define STBI_THREAD_LOCAL       _Thread_local
+   #endif
+
+   #ifndef STBI_THREAD_LOCAL
+      #if defined(__GNUC__)
+        #define STBI_THREAD_LOCAL       __thread
+      #endif
+   #endif
+#endif
+
+#ifdef _MSC_VER
+typedef unsigned short stbi__uint16;
+typedef   signed short stbi__int16;
+typedef unsigned int   stbi__uint32;
+typedef   signed int   stbi__int32;
+#else
+#include <stdint.h>
+typedef uint16_t stbi__uint16;
+typedef int16_t  stbi__int16;
+typedef uint32_t stbi__uint32;
+typedef int32_t  stbi__int32;
+#endif
+
+// should produce compiler error if size is wrong
+typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
+
+#ifdef _MSC_VER
+#define STBI_NOTUSED(v)  (void)(v)
+#else
+#define STBI_NOTUSED(v)  (void)sizeof(v)
+#endif
+
+#ifdef _MSC_VER
+#define STBI_HAS_LROTL
+#endif
+
+#ifdef STBI_HAS_LROTL
+   #define stbi_lrot(x,y)  _lrotl(x,y)
+#else
+   #define stbi_lrot(x,y)  (((x) << (y)) | ((x) >> (32 - (y))))
+#endif
+
+#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED))
+// ok
+#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED)
+// ok
+#else
+#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)."
+#endif
+
+#ifndef STBI_MALLOC
+#define STBI_MALLOC(sz)           malloc(sz)
+#define STBI_REALLOC(p,newsz)     realloc(p,newsz)
+#define STBI_FREE(p)              free(p)
+#endif
+
+#ifndef STBI_REALLOC_SIZED
+#define STBI_REALLOC_SIZED(p,oldsz,newsz) ((void)oldsz, STBI_REALLOC(p,newsz))
+#endif
+
+// x86/x64 detection
+#if defined(__x86_64__) || defined(_M_X64)
+#define STBI__X64_TARGET
+#elif defined(__i386) || defined(_M_IX86)
+#define STBI__X86_TARGET
+#endif
+
+#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD)
+// gcc doesn't support sse2 intrinsics unless you compile with -msse2,
+// which in turn means it gets to use SSE2 everywhere. This is unfortunate,
+// but previous attempts to provide the SSE2 functions with runtime
+// detection caused numerous issues. The way architecture extensions are
+// exposed in GCC/Clang is, sadly, not really suited for one-file libs.
+// New behavior: if compiled with -msse2, we use SSE2 without any
+// detection; if not, we don't use it at all.
+#define STBI_NO_SIMD
+#endif
+
+#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD)
+// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET
+//
+// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the
+// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant.
+// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not
+// simultaneously enabling "-mstackrealign".
+//
+// See https://github.com/nothings/stb/issues/81 for more information.
+//
+// So default to no SSE2 on 32-bit MinGW. If you've read this far and added
+// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2.
+#define STBI_NO_SIMD
+#endif
+
+#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET))
+#define STBI_SSE2
+#include <emmintrin.h>
+
+#ifdef _MSC_VER
+
+#if _MSC_VER >= 1400  // not VC6
+#include <intrin.h> // __cpuid
+static int stbi__cpuid3(void)
+{
+   int info[4];
+   __cpuid(info,1);
+   return info[3];
+}
+#else
+static int stbi__cpuid3(void)
+{
+   int res;
+   __asm {
+      mov  eax,1
+      cpuid
+      mov  res,edx
+   }
+   return res;
+}
+#endif
+
+#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name
+
+#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2)
+static int stbi__sse2_available(void)
+{
+   int info3 = stbi__cpuid3();
+   return ((info3 >> 26) & 1) != 0;
+}
+#endif
+
+#else // assume GCC-style if not VC++
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+
+#if !defined(STBI_NO_JPEG) && defined(STBI_SSE2)
+static int stbi__sse2_available(void)
+{
+   // If we're even attempting to compile this on GCC/Clang, that means
+   // -msse2 is on, which means the compiler is allowed to use SSE2
+   // instructions at will, and so are we.
+   return 1;
+}
+#endif
+
+#endif
+#endif
+
+// ARM NEON
+#if defined(STBI_NO_SIMD) && defined(STBI_NEON)
+#undef STBI_NEON
+#endif
+
+#ifdef STBI_NEON
+#include <arm_neon.h>
+// assume GCC or Clang on ARM targets
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+#endif
+
+#ifndef STBI_SIMD_ALIGN
+#define STBI_SIMD_ALIGN(type, name) type name
+#endif
+
+#ifndef STBI_MAX_DIMENSIONS
+#define STBI_MAX_DIMENSIONS (1 << 24)
+#endif
+
+///////////////////////////////////////////////
+//
+//  stbi__context struct and start_xxx functions
+
+// stbi__context structure is our basic context used by all images, so it
+// contains all the IO context, plus some basic image information
+typedef struct
+{
+   stbi__uint32 img_x, img_y;
+   int img_n, img_out_n;
+
+   stbi_io_callbacks io;
+   void *io_user_data;
+
+   int read_from_callbacks;
+   int buflen;
+   stbi_uc buffer_start[128];
+   int callback_already_read;
+
+   stbi_uc *img_buffer, *img_buffer_end;
+   stbi_uc *img_buffer_original, *img_buffer_original_end;
+} stbi__context;
+
+
+static void stbi__refill_buffer(stbi__context *s);
+
+// initialize a memory-decode context
+static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len)
+{
+   s->io.read = NULL;
+   s->read_from_callbacks = 0;
+   s->callback_already_read = 0;
+   s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer;
+   s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len;
+}
+
+// initialize a callback-based context
+static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user)
+{
+   s->io = *c;
+   s->io_user_data = user;
+   s->buflen = sizeof(s->buffer_start);
+   s->read_from_callbacks = 1;
+   s->callback_already_read = 0;
+   s->img_buffer = s->img_buffer_original = s->buffer_start;
+   stbi__refill_buffer(s);
+   s->img_buffer_original_end = s->img_buffer_end;
+}
+
+#ifndef STBI_NO_STDIO
+
+static int stbi__stdio_read(void *user, char *data, int size)
+{
+   return (int) fread(data,1,size,(FILE*) user);
+}
+
+static void stbi__stdio_skip(void *user, int n)
+{
+   int ch;
+   fseek((FILE*) user, n, SEEK_CUR);
+   ch = fgetc((FILE*) user);  /* have to read a byte to reset feof()'s flag */
+   if (ch != EOF) {
+      ungetc(ch, (FILE *) user);  /* push byte back onto stream if valid. */
+   }
+}
+
+static int stbi__stdio_eof(void *user)
+{
+   return feof((FILE*) user) || ferror((FILE *) user);
+}
+
+static stbi_io_callbacks stbi__stdio_callbacks =
+{
+   stbi__stdio_read,
+   stbi__stdio_skip,
+   stbi__stdio_eof,
+};
+
+static void stbi__start_file(stbi__context *s, FILE *f)
+{
+   stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f);
+}
+
+//static void stop_file(stbi__context *s) { }
+
+#endif // !STBI_NO_STDIO
+
+static void stbi__rewind(stbi__context *s)
+{
+   // conceptually rewind SHOULD rewind to the beginning of the stream,
+   // but we just rewind to the beginning of the initial buffer, because
+   // we only use it after doing 'test', which only ever looks at at most 92 bytes
+   s->img_buffer = s->img_buffer_original;
+   s->img_buffer_end = s->img_buffer_original_end;
+}
+
+enum
+{
+   STBI_ORDER_RGB,
+   STBI_ORDER_BGR
+};
+
+typedef struct
+{
+   int bits_per_channel;
+   int num_channels;
+   int channel_order;
+} stbi__result_info;
+
+#ifndef STBI_NO_JPEG
+static int      stbi__jpeg_test(stbi__context *s);
+static void    *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PNG
+static int      stbi__png_test(stbi__context *s);
+static void    *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__png_info(stbi__context *s, int *x, int *y, int *comp);
+static int      stbi__png_is16(stbi__context *s);
+#endif
+
+#ifndef STBI_NO_BMP
+static int      stbi__bmp_test(stbi__context *s);
+static void    *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_TGA
+static int      stbi__tga_test(stbi__context *s);
+static void    *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__tga_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PSD
+static int      stbi__psd_test(stbi__context *s);
+static void    *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc);
+static int      stbi__psd_info(stbi__context *s, int *x, int *y, int *comp);
+static int      stbi__psd_is16(stbi__context *s);
+#endif
+
+#ifndef STBI_NO_HDR
+static int      stbi__hdr_test(stbi__context *s);
+static float   *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PIC
+static int      stbi__pic_test(stbi__context *s);
+static void    *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__pic_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_GIF
+static int      stbi__gif_test(stbi__context *s);
+static void    *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static void    *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp);
+static int      stbi__gif_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PNM
+static int      stbi__pnm_test(stbi__context *s);
+static void    *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
+static int      stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+static
+#ifdef STBI_THREAD_LOCAL
+STBI_THREAD_LOCAL
+#endif
+const char *stbi__g_failure_reason;
+
+STBIDEF const char *stbi_failure_reason(void)
+{
+   return stbi__g_failure_reason;
+}
+
+#ifndef STBI_NO_FAILURE_STRINGS
+static int stbi__err(const char *str)
+{
+   stbi__g_failure_reason = str;
+   return 0;
+}
+#endif
+
+static void *stbi__malloc(size_t size)
+{
+    return STBI_MALLOC(size);
+}
+
+// stb_image uses ints pervasively, including for offset calculations.
+// therefore the largest decoded image size we can support with the
+// current code, even on 64-bit targets, is INT_MAX. this is not a
+// significant limitation for the intended use case.
+//
+// we do, however, need to make sure our size calculations don't
+// overflow. hence a few helper functions for size calculations that
+// multiply integers together, making sure that they're non-negative
+// and no overflow occurs.
+
+// return 1 if the sum is valid, 0 on overflow.
+// negative terms are considered invalid.
+static int stbi__addsizes_valid(int a, int b)
+{
+   if (b < 0) return 0;
+   // now 0 <= b <= INT_MAX, hence also
+   // 0 <= INT_MAX - b <= INTMAX.
+   // And "a + b <= INT_MAX" (which might overflow) is the
+   // same as a <= INT_MAX - b (no overflow)
+   return a <= INT_MAX - b;
+}
+
+// returns 1 if the product is valid, 0 on overflow.
+// negative factors are considered invalid.
+static int stbi__mul2sizes_valid(int a, int b)
+{
+   if (a < 0 || b < 0) return 0;
+   if (b == 0) return 1; // mul-by-0 is always safe
+   // portable way to check for no overflows in a*b
+   return a <= INT_MAX/b;
+}
+
+#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR)
+// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow
+static int stbi__mad2sizes_valid(int a, int b, int add)
+{
+   return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a*b, add);
+}
+#endif
+
+// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow
+static int stbi__mad3sizes_valid(int a, int b, int c, int add)
+{
+   return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) &&
+      stbi__addsizes_valid(a*b*c, add);
+}
+
+// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add)
+{
+   return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) &&
+      stbi__mul2sizes_valid(a*b*c, d) && stbi__addsizes_valid(a*b*c*d, add);
+}
+#endif
+
+#if !defined(STBI_NO_JPEG) || !defined(STBI_NO_PNG) || !defined(STBI_NO_TGA) || !defined(STBI_NO_HDR)
+// mallocs with size overflow checking
+static void *stbi__malloc_mad2(int a, int b, int add)
+{
+   if (!stbi__mad2sizes_valid(a, b, add)) return NULL;
+   return stbi__malloc(a*b + add);
+}
+#endif
+
+static void *stbi__malloc_mad3(int a, int b, int c, int add)
+{
+   if (!stbi__mad3sizes_valid(a, b, c, add)) return NULL;
+   return stbi__malloc(a*b*c + add);
+}
+
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+static void *stbi__malloc_mad4(int a, int b, int c, int d, int add)
+{
+   if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL;
+   return stbi__malloc(a*b*c*d + add);
+}
+#endif
+
+// stbi__err - error
+// stbi__errpf - error returning pointer to float
+// stbi__errpuc - error returning pointer to unsigned char
+
+#ifdef STBI_NO_FAILURE_STRINGS
+   #define stbi__err(x,y)  0
+#elif defined(STBI_FAILURE_USERMSG)
+   #define stbi__err(x,y)  stbi__err(y)
+#else
+   #define stbi__err(x,y)  stbi__err(x)
+#endif
+
+#define stbi__errpf(x,y)   ((float *)(size_t) (stbi__err(x,y)?NULL:NULL))
+#define stbi__errpuc(x,y)  ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL))
+
+STBIDEF void stbi_image_free(void *retval_from_stbi_load)
+{
+   STBI_FREE(retval_from_stbi_load);
+}
+
+#ifndef STBI_NO_LINEAR
+static float   *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
+#endif
+
+#ifndef STBI_NO_HDR
+static stbi_uc *stbi__hdr_to_ldr(float   *data, int x, int y, int comp);
+#endif
+
+static int stbi__vertically_flip_on_load_global = 0;
+
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip)
+{
+   stbi__vertically_flip_on_load_global = flag_true_if_should_flip;
+}
+
+#ifndef STBI_THREAD_LOCAL
+#define stbi__vertically_flip_on_load  stbi__vertically_flip_on_load_global
+#else
+static STBI_THREAD_LOCAL int stbi__vertically_flip_on_load_local, stbi__vertically_flip_on_load_set;
+
+STBIDEF void stbi_set_flip_vertically_on_load_thread(int flag_true_if_should_flip)
+{
+   stbi__vertically_flip_on_load_local = flag_true_if_should_flip;
+   stbi__vertically_flip_on_load_set = 1;
+}
+
+#define stbi__vertically_flip_on_load  (stbi__vertically_flip_on_load_set       \
+                                         ? stbi__vertically_flip_on_load_local  \
+                                         : stbi__vertically_flip_on_load_global)
+#endif // STBI_THREAD_LOCAL
+
+static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc)
+{
+   memset(ri, 0, sizeof(*ri)); // make sure it's initialized if we add new fields
+   ri->bits_per_channel = 8; // default is 8 so most paths don't have to be changed
+   ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here so we can add BGR order
+   ri->num_channels = 0;
+
+   #ifndef STBI_NO_JPEG
+   if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp, ri);
+   #endif
+   #ifndef STBI_NO_PNG
+   if (stbi__png_test(s))  return stbi__png_load(s,x,y,comp,req_comp, ri);
+   #endif
+   #ifndef STBI_NO_BMP
+   if (stbi__bmp_test(s))  return stbi__bmp_load(s,x,y,comp,req_comp, ri);
+   #endif
+   #ifndef STBI_NO_GIF
+   if (stbi__gif_test(s))  return stbi__gif_load(s,x,y,comp,req_comp, ri);
+   #endif
+   #ifndef STBI_NO_PSD
+   if (stbi__psd_test(s))  return stbi__psd_load(s,x,y,comp,req_comp, ri, bpc);
+   #else
+   STBI_NOTUSED(bpc);
+   #endif
+   #ifndef STBI_NO_PIC
+   if (stbi__pic_test(s))  return stbi__pic_load(s,x,y,comp,req_comp, ri);
+   #endif
+   #ifndef STBI_NO_PNM
+   if (stbi__pnm_test(s))  return stbi__pnm_load(s,x,y,comp,req_comp, ri);
+   #endif
+
+   #ifndef STBI_NO_HDR
+   if (stbi__hdr_test(s)) {
+      float *hdr = stbi__hdr_load(s, x,y,comp,req_comp, ri);
+      return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
+   }
+   #endif
+
+   #ifndef STBI_NO_TGA
+   // test tga last because it's a crappy test!
+   if (stbi__tga_test(s))
+      return stbi__tga_load(s,x,y,comp,req_comp, ri);
+   #endif
+
+   return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");
+}
+
+static stbi_uc *stbi__convert_16_to_8(stbi__uint16 *orig, int w, int h, int channels)
+{
+   int i;
+   int img_len = w * h * channels;
+   stbi_uc *reduced;
+
+   reduced = (stbi_uc *) stbi__malloc(img_len);
+   if (reduced == NULL) return stbi__errpuc("outofmem", "Out of memory");
+
+   for (i = 0; i < img_len; ++i)
+      reduced[i] = (stbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte is sufficient approx of 16->8 bit scaling
+
+   STBI_FREE(orig);
+   return reduced;
+}
+
+static stbi__uint16 *stbi__convert_8_to_16(stbi_uc *orig, int w, int h, int channels)
+{
+   int i;
+   int img_len = w * h * channels;
+   stbi__uint16 *enlarged;
+
+   enlarged = (stbi__uint16 *) stbi__malloc(img_len*2);
+   if (enlarged == NULL) return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory");
+
+   for (i = 0; i < img_len; ++i)
+      enlarged[i] = (stbi__uint16)((orig[i] << 8) + orig[i]); // replicate to high and low byte, maps 0->0, 255->0xffff
+
+   STBI_FREE(orig);
+   return enlarged;
+}
+
+static void stbi__vertical_flip(void *image, int w, int h, int bytes_per_pixel)
+{
+   int row;
+   size_t bytes_per_row = (size_t)w * bytes_per_pixel;
+   stbi_uc temp[2048];
+   stbi_uc *bytes = (stbi_uc *)image;
+
+   for (row = 0; row < (h>>1); row++) {
+      stbi_uc *row0 = bytes + row*bytes_per_row;
+      stbi_uc *row1 = bytes + (h - row - 1)*bytes_per_row;
+      // swap row0 with row1
+      size_t bytes_left = bytes_per_row;
+      while (bytes_left) {
+         size_t bytes_copy = (bytes_left < sizeof(temp)) ? bytes_left : sizeof(temp);
+         memcpy(temp, row0, bytes_copy);
+         memcpy(row0, row1, bytes_copy);
+         memcpy(row1, temp, bytes_copy);
+         row0 += bytes_copy;
+         row1 += bytes_copy;
+         bytes_left -= bytes_copy;
+      }
+   }
+}
+
+#ifndef STBI_NO_GIF
+static void stbi__vertical_flip_slices(void *image, int w, int h, int z, int bytes_per_pixel)
+{
+   int slice;
+   int slice_size = w * h * bytes_per_pixel;
+
+   stbi_uc *bytes = (stbi_uc *)image;
+   for (slice = 0; slice < z; ++slice) {
+      stbi__vertical_flip(bytes, w, h, bytes_per_pixel);
+      bytes += slice_size;
+   }
+}
+#endif
+
+static unsigned char *stbi__load_and_postprocess_8bit(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__result_info ri;
+   void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 8);
+
+   if (result == NULL)
+      return NULL;
+
+   // it is the responsibility of the loaders to make sure we get either 8 or 16 bit.
+   STBI_ASSERT(ri.bits_per_channel == 8 || ri.bits_per_channel == 16);
+
+   if (ri.bits_per_channel != 8) {
+      result = stbi__convert_16_to_8((stbi__uint16 *) result, *x, *y, req_comp == 0 ? *comp : req_comp);
+      ri.bits_per_channel = 8;
+   }
+
+   // @TODO: move stbi__convert_format to here
+
+   if (stbi__vertically_flip_on_load) {
+      int channels = req_comp ? req_comp : *comp;
+      stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi_uc));
+   }
+
+   return (unsigned char *) result;
+}
+
+static stbi__uint16 *stbi__load_and_postprocess_16bit(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__result_info ri;
+   void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 16);
+
+   if (result == NULL)
+      return NULL;
+
+   // it is the responsibility of the loaders to make sure we get either 8 or 16 bit.
+   STBI_ASSERT(ri.bits_per_channel == 8 || ri.bits_per_channel == 16);
+
+   if (ri.bits_per_channel != 16) {
+      result = stbi__convert_8_to_16((stbi_uc *) result, *x, *y, req_comp == 0 ? *comp : req_comp);
+      ri.bits_per_channel = 16;
+   }
+
+   // @TODO: move stbi__convert_format16 to here
+   // @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to keep more precision
+
+   if (stbi__vertically_flip_on_load) {
+      int channels = req_comp ? req_comp : *comp;
+      stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi__uint16));
+   }
+
+   return (stbi__uint16 *) result;
+}
+
+#if !defined(STBI_NO_HDR) && !defined(STBI_NO_LINEAR)
+static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp)
+{
+   if (stbi__vertically_flip_on_load && result != NULL) {
+      int channels = req_comp ? req_comp : *comp;
+      stbi__vertical_flip(result, *x, *y, channels * sizeof(float));
+   }
+}
+#endif
+
+#ifndef STBI_NO_STDIO
+
+#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
+STBI_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide);
+STBI_EXTERN __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags, const wchar_t *widestr, int cchwide, char *str, int cbmb, const char *defchar, int *used_default);
+#endif
+
+#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
+STBIDEF int stbi_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input)
+{
+        return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL);
+}
+#endif
+
+static FILE *stbi__fopen(char const *filename, char const *mode)
+{
+   FILE *f;
+#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
+   wchar_t wMode[64];
+   wchar_t wFilename[1024];
+        if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename)))
+      return 0;
+
+        if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode)))
+      return 0;
+
+#if _MSC_VER >= 1400
+        if (0 != _wfopen_s(&f, wFilename, wMode))
+                f = 0;
+#else
+   f = _wfopen(wFilename, wMode);
+#endif
+
+#elif defined(_MSC_VER) && _MSC_VER >= 1400
+   if (0 != fopen_s(&f, filename, mode))
+      f=0;
+#else
+   f = fopen(filename, mode);
+#endif
+   return f;
+}
+
+
+STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+   FILE *f = stbi__fopen(filename, "rb");
+   unsigned char *result;
+   if (!f) return stbi__errpuc("can't fopen", "Unable to open file");
+   result = stbi_load_from_file(f,x,y,comp,req_comp);
+   fclose(f);
+   return result;
+}
+
+STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+   unsigned char *result;
+   stbi__context s;
+   stbi__start_file(&s,f);
+   result = stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
+   if (result) {
+      // need to 'unget' all the characters in the IO buffer
+      fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR);
+   }
+   return result;
+}
+
+STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__uint16 *result;
+   stbi__context s;
+   stbi__start_file(&s,f);
+   result = stbi__load_and_postprocess_16bit(&s,x,y,comp,req_comp);
+   if (result) {
+      // need to 'unget' all the characters in the IO buffer
+      fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR);
+   }
+   return result;
+}
+
+STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+   FILE *f = stbi__fopen(filename, "rb");
+   stbi__uint16 *result;
+   if (!f) return (stbi_us *) stbi__errpuc("can't fopen", "Unable to open file");
+   result = stbi_load_from_file_16(f,x,y,comp,req_comp);
+   fclose(f);
+   return result;
+}
+
+
+#endif //!STBI_NO_STDIO
+
+STBIDEF stbi_us *stbi_load_16_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels);
+}
+
+STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user);
+   return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels);
+}
+
+STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
+}
+
+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+   return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
+}
+
+#ifndef STBI_NO_GIF
+STBIDEF stbi_uc *stbi_load_gif_from_memory(stbi_uc const *buffer, int len, int **delays, int *x, int *y, int *z, int *comp, int req_comp)
+{
+   unsigned char *result;
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+
+   result = (unsigned char*) stbi__load_gif_main(&s, delays, x, y, z, comp, req_comp);
+   if (stbi__vertically_flip_on_load) {
+      stbi__vertical_flip_slices( result, *x, *y, *z, *comp );
+   }
+
+   return result;
+}
+#endif
+
+#ifndef STBI_NO_LINEAR
+static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   unsigned char *data;
+   #ifndef STBI_NO_HDR
+   if (stbi__hdr_test(s)) {
+      stbi__result_info ri;
+      float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp, &ri);
+      if (hdr_data)
+         stbi__float_postprocess(hdr_data,x,y,comp,req_comp);
+      return hdr_data;
+   }
+   #endif
+   data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp);
+   if (data)
+      return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
+   return stbi__errpf("unknown image type", "Image not of any known type, or corrupt");
+}
+
+STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+
+STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+   return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+   float *result;
+   FILE *f = stbi__fopen(filename, "rb");
+   if (!f) return stbi__errpf("can't fopen", "Unable to open file");
+   result = stbi_loadf_from_file(f,x,y,comp,req_comp);
+   fclose(f);
+   return result;
+}
+
+STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_file(&s,f);
+   return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+#endif // !STBI_NO_STDIO
+
+#endif // !STBI_NO_LINEAR
+
+// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is
+// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always
+// reports false!
+
+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
+{
+   #ifndef STBI_NO_HDR
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__hdr_test(&s);
+   #else
+   STBI_NOTUSED(buffer);
+   STBI_NOTUSED(len);
+   return 0;
+   #endif
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF int      stbi_is_hdr          (char const *filename)
+{
+   FILE *f = stbi__fopen(filename, "rb");
+   int result=0;
+   if (f) {
+      result = stbi_is_hdr_from_file(f);
+      fclose(f);
+   }
+   return result;
+}
+
+STBIDEF int stbi_is_hdr_from_file(FILE *f)
+{
+   #ifndef STBI_NO_HDR
+   long pos = ftell(f);
+   int res;
+   stbi__context s;
+   stbi__start_file(&s,f);
+   res = stbi__hdr_test(&s);
+   fseek(f, pos, SEEK_SET);
+   return res;
+   #else
+   STBI_NOTUSED(f);
+   return 0;
+   #endif
+}
+#endif // !STBI_NO_STDIO
+
+STBIDEF int      stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user)
+{
+   #ifndef STBI_NO_HDR
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+   return stbi__hdr_test(&s);
+   #else
+   STBI_NOTUSED(clbk);
+   STBI_NOTUSED(user);
+   return 0;
+   #endif
+}
+
+#ifndef STBI_NO_LINEAR
+static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f;
+
+STBIDEF void   stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; }
+STBIDEF void   stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; }
+#endif
+
+static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f;
+
+STBIDEF void   stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; }
+STBIDEF void   stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; }
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Common code used by all image loaders
+//
+
+enum
+{
+   STBI__SCAN_load=0,
+   STBI__SCAN_type,
+   STBI__SCAN_header
+};
+
+static void stbi__refill_buffer(stbi__context *s)
+{
+   int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen);
+   s->callback_already_read += (int) (s->img_buffer - s->img_buffer_original);
+   if (n == 0) {
+      // at end of file, treat same as if from memory, but need to handle case
+      // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file
+      s->read_from_callbacks = 0;
+      s->img_buffer = s->buffer_start;
+      s->img_buffer_end = s->buffer_start+1;
+      *s->img_buffer = 0;
+   } else {
+      s->img_buffer = s->buffer_start;
+      s->img_buffer_end = s->buffer_start + n;
+   }
+}
+
+stbi_inline static stbi_uc stbi__get8(stbi__context *s)
+{
+   if (s->img_buffer < s->img_buffer_end)
+      return *s->img_buffer++;
+   if (s->read_from_callbacks) {
+      stbi__refill_buffer(s);
+      return *s->img_buffer++;
+   }
+   return 0;
+}
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_HDR) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
+// nothing
+#else
+stbi_inline static int stbi__at_eof(stbi__context *s)
+{
+   if (s->io.read) {
+      if (!(s->io.eof)(s->io_user_data)) return 0;
+      // if feof() is true, check if buffer = end
+      // special case: we've only got the special 0 character at the end
+      if (s->read_from_callbacks == 0) return 1;
+   }
+
+   return s->img_buffer >= s->img_buffer_end;
+}
+#endif
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC)
+// nothing
+#else
+static void stbi__skip(stbi__context *s, int n)
+{
+   if (n == 0) return;  // already there!
+   if (n < 0) {
+      s->img_buffer = s->img_buffer_end;
+      return;
+   }
+   if (s->io.read) {
+      int blen = (int) (s->img_buffer_end - s->img_buffer);
+      if (blen < n) {
+         s->img_buffer = s->img_buffer_end;
+         (s->io.skip)(s->io_user_data, n - blen);
+         return;
+      }
+   }
+   s->img_buffer += n;
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_TGA) && defined(STBI_NO_HDR) && defined(STBI_NO_PNM)
+// nothing
+#else
+static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n)
+{
+   if (s->io.read) {
+      int blen = (int) (s->img_buffer_end - s->img_buffer);
+      if (blen < n) {
+         int res, count;
+
+         memcpy(buffer, s->img_buffer, blen);
+
+         count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen);
+         res = (count == (n-blen));
+         s->img_buffer = s->img_buffer_end;
+         return res;
+      }
+   }
+
+   if (s->img_buffer+n <= s->img_buffer_end) {
+      memcpy(buffer, s->img_buffer, n);
+      s->img_buffer += n;
+      return 1;
+   } else
+      return 0;
+}
+#endif
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC)
+// nothing
+#else
+static int stbi__get16be(stbi__context *s)
+{
+   int z = stbi__get8(s);
+   return (z << 8) + stbi__get8(s);
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD) && defined(STBI_NO_PIC)
+// nothing
+#else
+static stbi__uint32 stbi__get32be(stbi__context *s)
+{
+   stbi__uint32 z = stbi__get16be(s);
+   return (z << 16) + stbi__get16be(s);
+}
+#endif
+
+#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF)
+// nothing
+#else
+static int stbi__get16le(stbi__context *s)
+{
+   int z = stbi__get8(s);
+   return z + (stbi__get8(s) << 8);
+}
+#endif
+
+#ifndef STBI_NO_BMP
+static stbi__uint32 stbi__get32le(stbi__context *s)
+{
+   stbi__uint32 z = stbi__get16le(s);
+   return z + (stbi__get16le(s) << 16);
+}
+#endif
+
+#define STBI__BYTECAST(x)  ((stbi_uc) ((x) & 255))  // truncate int to byte without warnings
+
+#if defined(STBI_NO_JPEG) && defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
+// nothing
+#else
+//////////////////////////////////////////////////////////////////////////////
+//
+//  generic converter from built-in img_n to req_comp
+//    individual types do this automatically as much as possible (e.g. jpeg
+//    does all cases internally since it needs to colorspace convert anyway,
+//    and it never has alpha, so very few cases ). png can automatically
+//    interleave an alpha=255 channel, but falls back to this for other cases
+//
+//  assume data buffer is malloced, so malloc a new one and free that one
+//  only failure mode is malloc failing
+
+static stbi_uc stbi__compute_y(int r, int g, int b)
+{
+   return (stbi_uc) (((r*77) + (g*150) +  (29*b)) >> 8);
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_BMP) && defined(STBI_NO_PSD) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF) && defined(STBI_NO_PIC) && defined(STBI_NO_PNM)
+// nothing
+#else
+static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y)
+{
+   int i,j;
+   unsigned char *good;
+
+   if (req_comp == img_n) return data;
+   STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+
+   good = (unsigned char *) stbi__malloc_mad3(req_comp, x, y, 0);
+   if (good == NULL) {
+      STBI_FREE(data);
+      return stbi__errpuc("outofmem", "Out of memory");
+   }
+
+   for (j=0; j < (int) y; ++j) {
+      unsigned char *src  = data + j * x * img_n   ;
+      unsigned char *dest = good + j * x * req_comp;
+
+      #define STBI__COMBO(a,b)  ((a)*8+(b))
+      #define STBI__CASE(a,b)   case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
+      // convert source image with img_n components to one with req_comp components;
+      // avoid switch per pixel, so use switch per scanline and massive macros
+      switch (STBI__COMBO(img_n, req_comp)) {
+         STBI__CASE(1,2) { dest[0]=src[0]; dest[1]=255;                                     } break;
+         STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0];                                  } break;
+         STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=255;                     } break;
+         STBI__CASE(2,1) { dest[0]=src[0];                                                  } break;
+         STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0];                                  } break;
+         STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=src[1];                  } break;
+         STBI__CASE(3,4) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];dest[3]=255;        } break;
+         STBI__CASE(3,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]);                   } break;
+         STBI__CASE(3,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); dest[1] = 255;    } break;
+         STBI__CASE(4,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]);                   } break;
+         STBI__CASE(4,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); dest[1] = src[3]; } break;
+         STBI__CASE(4,3) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];                    } break;
+         default: STBI_ASSERT(0); STBI_FREE(data); STBI_FREE(good); return stbi__errpuc("unsupported", "Unsupported format conversion");
+      }
+      #undef STBI__CASE
+   }
+
+   STBI_FREE(data);
+   return good;
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD)
+// nothing
+#else
+static stbi__uint16 stbi__compute_y_16(int r, int g, int b)
+{
+   return (stbi__uint16) (((r*77) + (g*150) +  (29*b)) >> 8);
+}
+#endif
+
+#if defined(STBI_NO_PNG) && defined(STBI_NO_PSD)
+// nothing
+#else
+static stbi__uint16 *stbi__convert_format16(stbi__uint16 *data, int img_n, int req_comp, unsigned int x, unsigned int y)
+{
+   int i,j;
+   stbi__uint16 *good;
+
+   if (req_comp == img_n) return data;
+   STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+
+   good = (stbi__uint16 *) stbi__malloc(req_comp * x * y * 2);
+   if (good == NULL) {
+      STBI_FREE(data);
+      return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory");
+   }
+
+   for (j=0; j < (int) y; ++j) {
+      stbi__uint16 *src  = data + j * x * img_n   ;
+      stbi__uint16 *dest = good + j * x * req_comp;
+
+      #define STBI__COMBO(a,b)  ((a)*8+(b))
+      #define STBI__CASE(a,b)   case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
+      // convert source image with img_n components to one with req_comp components;
+      // avoid switch per pixel, so use switch per scanline and massive macros
+      switch (STBI__COMBO(img_n, req_comp)) {
+         STBI__CASE(1,2) { dest[0]=src[0]; dest[1]=0xffff;                                     } break;
+         STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0];                                     } break;
+         STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=0xffff;                     } break;
+         STBI__CASE(2,1) { dest[0]=src[0];                                                     } break;
+         STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0];                                     } break;
+         STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0]; dest[3]=src[1];                     } break;
+         STBI__CASE(3,4) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];dest[3]=0xffff;        } break;
+         STBI__CASE(3,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]);                   } break;
+         STBI__CASE(3,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); dest[1] = 0xffff; } break;
+         STBI__CASE(4,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]);                   } break;
+         STBI__CASE(4,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); dest[1] = src[3]; } break;
+         STBI__CASE(4,3) { dest[0]=src[0];dest[1]=src[1];dest[2]=src[2];                       } break;
+         default: STBI_ASSERT(0); STBI_FREE(data); STBI_FREE(good); return (stbi__uint16*) stbi__errpuc("unsupported", "Unsupported format conversion");
+      }
+      #undef STBI__CASE
+   }
+
+   STBI_FREE(data);
+   return good;
+}
+#endif
+
+#ifndef STBI_NO_LINEAR
+static float   *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
+{
+   int i,k,n;
+   float *output;
+   if (!data) return NULL;
+   output = (float *) stbi__malloc_mad4(x, y, comp, sizeof(float), 0);
+   if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); }
+   // compute number of non-alpha components
+   if (comp & 1) n = comp; else n = comp-1;
+   for (i=0; i < x*y; ++i) {
+      for (k=0; k < n; ++k) {
+         output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale);
+      }
+   }
+   if (n < comp) {
+      for (i=0; i < x*y; ++i) {
+         output[i*comp + n] = data[i*comp + n]/255.0f;
+      }
+   }
+   STBI_FREE(data);
+   return output;
+}
+#endif
+
+#ifndef STBI_NO_HDR
+#define stbi__float2int(x)   ((int) (x))
+static stbi_uc *stbi__hdr_to_ldr(float   *data, int x, int y, int comp)
+{
+   int i,k,n;
+   stbi_uc *output;
+   if (!data) return NULL;
+   output = (stbi_uc *) stbi__malloc_mad3(x, y, comp, 0);
+   if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); }
+   // compute number of non-alpha components
+   if (comp & 1) n = comp; else n = comp-1;
+   for (i=0; i < x*y; ++i) {
+      for (k=0; k < n; ++k) {
+         float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f;
+         if (z < 0) z = 0;
+         if (z > 255) z = 255;
+         output[i*comp + k] = (stbi_uc) stbi__float2int(z);
+      }
+      if (k < comp) {
+         float z = data[i*comp+k] * 255 + 0.5f;
+         if (z < 0) z = 0;
+         if (z > 255) z = 255;
+         output[i*comp + k] = (stbi_uc) stbi__float2int(z);
+      }
+   }
+   STBI_FREE(data);
+   return output;
+}
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//  "baseline" JPEG/JFIF decoder
+//
+//    simple implementation
+//      - doesn't support delayed output of y-dimension
+//      - simple interface (only one output format: 8-bit interleaved RGB)
+//      - doesn't try to recover corrupt jpegs
+//      - doesn't allow partial loading, loading multiple at once
+//      - still fast on x86 (copying globals into locals doesn't help x86)
+//      - allocates lots of intermediate memory (full size of all components)
+//        - non-interleaved case requires this anyway
+//        - allows good upsampling (see next)
+//    high-quality
+//      - upsampled channels are bilinearly interpolated, even across blocks
+//      - quality integer IDCT derived from IJG's 'slow'
+//    performance
+//      - fast huffman; reasonable integer IDCT
+//      - some SIMD kernels for common paths on targets with SSE2/NEON
+//      - uses a lot of intermediate memory, could cache poorly
+
+#ifndef STBI_NO_JPEG
+
+// huffman decoding acceleration
+#define FAST_BITS   9  // larger handles more cases; smaller stomps less cache
+
+typedef struct
+{
+   stbi_uc  fast[1 << FAST_BITS];
+   // weirdly, repacking this into AoS is a 10% speed loss, instead of a win
+   stbi__uint16 code[256];
+   stbi_uc  values[256];
+   stbi_uc  size[257];
+   unsigned int maxcode[18];
+   int    delta[17];   // old 'firstsymbol' - old 'firstcode'
+} stbi__huffman;
+
+typedef struct
+{
+   stbi__context *s;
+   stbi__huffman huff_dc[4];
+   stbi__huffman huff_ac[4];
+   stbi__uint16 dequant[4][64];
+   stbi__int16 fast_ac[4][1 << FAST_BITS];
+
+// sizes for components, interleaved MCUs
+   int img_h_max, img_v_max;
+   int img_mcu_x, img_mcu_y;
+   int img_mcu_w, img_mcu_h;
+
+// definition of jpeg image component
+   struct
+   {
+      int id;
+      int h,v;
+      int tq;
+      int hd,ha;
+      int dc_pred;
+
+      int x,y,w2,h2;
+      stbi_uc *data;
+      void *raw_data, *raw_coeff;
+      stbi_uc *linebuf;
+      short   *coeff;   // progressive only
+      int      coeff_w, coeff_h; // number of 8x8 coefficient blocks
+   } img_comp[4];
+
+   stbi__uint32   code_buffer; // jpeg entropy-coded buffer
+   int            code_bits;   // number of valid bits
+   unsigned char  marker;      // marker seen while filling entropy buffer
+   int            nomore;      // flag if we saw a marker so must stop
+
+   int            progressive;
+   int            spec_start;
+   int            spec_end;
+   int            succ_high;
+   int            succ_low;
+   int            eob_run;
+   int            jfif;
+   int            app14_color_transform; // Adobe APP14 tag
+   int            rgb;
+
+   int scan_n, order[4];
+   int restart_interval, todo;
+
+// kernels
+   void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]);
+   void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step);
+   stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs);
+} stbi__jpeg;
+
+static int stbi__build_huffman(stbi__huffman *h, int *count)
+{
+   int i,j,k=0;
+   unsigned int code;
+   // build size list for each symbol (from JPEG spec)
+   for (i=0; i < 16; ++i)
+      for (j=0; j < count[i]; ++j)
+         h->size[k++] = (stbi_uc) (i+1);
+   h->size[k] = 0;
+
+   // compute actual symbols (from jpeg spec)
+   code = 0;
+   k = 0;
+   for(j=1; j <= 16; ++j) {
+      // compute delta to add to code to compute symbol id
+      h->delta[j] = k - code;
+      if (h->size[k] == j) {
+         while (h->size[k] == j)
+            h->code[k++] = (stbi__uint16) (code++);
+         if (code-1 >= (1u << j)) return stbi__err("bad code lengths","Corrupt JPEG");
+      }
+      // compute largest code + 1 for this size, preshifted as needed later
+      h->maxcode[j] = code << (16-j);
+      code <<= 1;
+   }
+   h->maxcode[j] = 0xffffffff;
+
+   // build non-spec acceleration table; 255 is flag for not-accelerated
+   memset(h->fast, 255, 1 << FAST_BITS);
+   for (i=0; i < k; ++i) {
+      int s = h->size[i];
+      if (s <= FAST_BITS) {
+         int c = h->code[i] << (FAST_BITS-s);
+         int m = 1 << (FAST_BITS-s);
+         for (j=0; j < m; ++j) {
+            h->fast[c+j] = (stbi_uc) i;
+         }
+      }
+   }
+   return 1;
+}
+
+// build a table that decodes both magnitude and value of small ACs in
+// one go.
+static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h)
+{
+   int i;
+   for (i=0; i < (1 << FAST_BITS); ++i) {
+      stbi_uc fast = h->fast[i];
+      fast_ac[i] = 0;
+      if (fast < 255) {
+         int rs = h->values[fast];
+         int run = (rs >> 4) & 15;
+         int magbits = rs & 15;
+         int len = h->size[fast];
+
+         if (magbits && len + magbits <= FAST_BITS) {
+            // magnitude code followed by receive_extend code
+            int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits);
+            int m = 1 << (magbits - 1);
+            if (k < m) k += (~0U << magbits) + 1;
+            // if the result is small enough, we can fit it in fast_ac table
+            if (k >= -128 && k <= 127)
+               fast_ac[i] = (stbi__int16) ((k * 256) + (run * 16) + (len + magbits));
+         }
+      }
+   }
+}
+
+static void stbi__grow_buffer_unsafe(stbi__jpeg *j)
+{
+   do {
+      unsigned int b = j->nomore ? 0 : stbi__get8(j->s);
+      if (b == 0xff) {
+         int c = stbi__get8(j->s);
+         while (c == 0xff) c = stbi__get8(j->s); // consume fill bytes
+         if (c != 0) {
+            j->marker = (unsigned char) c;
+            j->nomore = 1;
+            return;
+         }
+      }
+      j->code_buffer |= b << (24 - j->code_bits);
+      j->code_bits += 8;
+   } while (j->code_bits <= 24);
+}
+
+// (1 << n) - 1
+static const stbi__uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535};
+
+// decode a jpeg huffman value from the bitstream
+stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h)
+{
+   unsigned int temp;
+   int c,k;
+
+   if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+
+   // look at the top FAST_BITS and determine what symbol ID it is,
+   // if the code is <= FAST_BITS
+   c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+   k = h->fast[c];
+   if (k < 255) {
+      int s = h->size[k];
+      if (s > j->code_bits)
+         return -1;
+      j->code_buffer <<= s;
+      j->code_bits -= s;
+      return h->values[k];
+   }
+
+   // naive test is to shift the code_buffer down so k bits are
+   // valid, then test against maxcode. To speed this up, we've
+   // preshifted maxcode left so that it has (16-k) 0s at the
+   // end; in other words, regardless of the number of bits, it
+   // wants to be compared against something shifted to have 16;
+   // that way we don't need to shift inside the loop.
+   temp = j->code_buffer >> 16;
+   for (k=FAST_BITS+1 ; ; ++k)
+      if (temp < h->maxcode[k])
+         break;
+   if (k == 17) {
+      // error! code not found
+      j->code_bits -= 16;
+      return -1;
+   }
+
+   if (k > j->code_bits)
+      return -1;
+
+   // convert the huffman code to the symbol id
+   c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
+   STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]);
+
+   // convert the id to a symbol
+   j->code_bits -= k;
+   j->code_buffer <<= k;
+   return h->values[c];
+}
+
+// bias[n] = (-1<<n) + 1
+static const int stbi__jbias[16] = {0,-1,-3,-7,-15,-31,-63,-127,-255,-511,-1023,-2047,-4095,-8191,-16383,-32767};
+
+// combined JPEG 'receive' and JPEG 'extend', since baseline
+// always extends everything it receives.
+stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n)
+{
+   unsigned int k;
+   int sgn;
+   if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+
+   sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB
+   k = stbi_lrot(j->code_buffer, n);
+   if (n < 0 || n >= (int) (sizeof(stbi__bmask)/sizeof(*stbi__bmask))) return 0;
+   j->code_buffer = k & ~stbi__bmask[n];
+   k &= stbi__bmask[n];
+   j->code_bits -= n;
+   return k + (stbi__jbias[n] & ~sgn);
+}
+
+// get some unsigned bits
+stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n)
+{
+   unsigned int k;
+   if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+   k = stbi_lrot(j->code_buffer, n);
+   j->code_buffer = k & ~stbi__bmask[n];
+   k &= stbi__bmask[n];
+   j->code_bits -= n;
+   return k;
+}
+
+stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j)
+{
+   unsigned int k;
+   if (j->code_bits < 1) stbi__grow_buffer_unsafe(j);
+   k = j->code_buffer;
+   j->code_buffer <<= 1;
+   --j->code_bits;
+   return k & 0x80000000;
+}
+
+// given a value that's at position X in the zigzag stream,
+// where does it appear in the 8x8 matrix coded as row-major?
+static const stbi_uc stbi__jpeg_dezigzag[64+15] =
+{
+    0,  1,  8, 16,  9,  2,  3, 10,
+   17, 24, 32, 25, 18, 11,  4,  5,
+   12, 19, 26, 33, 40, 48, 41, 34,
+   27, 20, 13,  6,  7, 14, 21, 28,
+   35, 42, 49, 56, 57, 50, 43, 36,
+   29, 22, 15, 23, 30, 37, 44, 51,
+   58, 59, 52, 45, 38, 31, 39, 46,
+   53, 60, 61, 54, 47, 55, 62, 63,
+   // let corrupt input sample past end
+   63, 63, 63, 63, 63, 63, 63, 63,
+   63, 63, 63, 63, 63, 63, 63
+};
+
+// decode one 64-entry block--
+static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi__uint16 *dequant)
+{
+   int diff,dc,k;
+   int t;
+
+   if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+   t = stbi__jpeg_huff_decode(j, hdc);
+   if (t < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+
+   // 0 all the ac values now so we can do it 32-bits at a time
+   memset(data,0,64*sizeof(data[0]));
+
+   diff = t ? stbi__extend_receive(j, t) : 0;
+   dc = j->img_comp[b].dc_pred + diff;
+   j->img_comp[b].dc_pred = dc;
+   data[0] = (short) (dc * dequant[0]);
+
+   // decode AC components, see JPEG spec
+   k = 1;
+   do {
+      unsigned int zig;
+      int c,r,s;
+      if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+      c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+      r = fac[c];
+      if (r) { // fast-AC path
+         k += (r >> 4) & 15; // run
+         s = r & 15; // combined length
+         j->code_buffer <<= s;
+         j->code_bits -= s;
+         // decode into unzigzag'd location
+         zig = stbi__jpeg_dezigzag[k++];
+         data[zig] = (short) ((r >> 8) * dequant[zig]);
+      } else {
+         int rs = stbi__jpeg_huff_decode(j, hac);
+         if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+         s = rs & 15;
+         r = rs >> 4;
+         if (s == 0) {
+            if (rs != 0xf0) break; // end block
+            k += 16;
+         } else {
+            k += r;
+            // decode into unzigzag'd location
+            zig = stbi__jpeg_dezigzag[k++];
+            data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]);
+         }
+      }
+   } while (k < 64);
+   return 1;
+}
+
+static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b)
+{
+   int diff,dc;
+   int t;
+   if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+
+   if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+
+   if (j->succ_high == 0) {
+      // first scan for DC coefficient, must be first
+      memset(data,0,64*sizeof(data[0])); // 0 all the ac values now
+      t = stbi__jpeg_huff_decode(j, hdc);
+      if (t == -1) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+      diff = t ? stbi__extend_receive(j, t) : 0;
+
+      dc = j->img_comp[b].dc_pred + diff;
+      j->img_comp[b].dc_pred = dc;
+      data[0] = (short) (dc << j->succ_low);
+   } else {
+      // refinement scan for DC coefficient
+      if (stbi__jpeg_get_bit(j))
+         data[0] += (short) (1 << j->succ_low);
+   }
+   return 1;
+}
+
+// @OPTIMIZE: store non-zigzagged during the decode passes,
+// and only de-zigzag when dequantizing
+static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac)
+{
+   int k;
+   if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+
+   if (j->succ_high == 0) {
+      int shift = j->succ_low;
+
+      if (j->eob_run) {
+         --j->eob_run;
+         return 1;
+      }
+
+      k = j->spec_start;
+      do {
+         unsigned int zig;
+         int c,r,s;
+         if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+         c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+         r = fac[c];
+         if (r) { // fast-AC path
+            k += (r >> 4) & 15; // run
+            s = r & 15; // combined length
+            j->code_buffer <<= s;
+            j->code_bits -= s;
+            zig = stbi__jpeg_dezigzag[k++];
+            data[zig] = (short) ((r >> 8) << shift);
+         } else {
+            int rs = stbi__jpeg_huff_decode(j, hac);
+            if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+            s = rs & 15;
+            r = rs >> 4;
+            if (s == 0) {
+               if (r < 15) {
+                  j->eob_run = (1 << r);
+                  if (r)
+                     j->eob_run += stbi__jpeg_get_bits(j, r);
+                  --j->eob_run;
+                  break;
+               }
+               k += 16;
+            } else {
+               k += r;
+               zig = stbi__jpeg_dezigzag[k++];
+               data[zig] = (short) (stbi__extend_receive(j,s) << shift);
+            }
+         }
+      } while (k <= j->spec_end);
+   } else {
+      // refinement scan for these AC coefficients
+
+      short bit = (short) (1 << j->succ_low);
+
+      if (j->eob_run) {
+         --j->eob_run;
+         for (k = j->spec_start; k <= j->spec_end; ++k) {
+            short *p = &data[stbi__jpeg_dezigzag[k]];
+            if (*p != 0)
+               if (stbi__jpeg_get_bit(j))
+                  if ((*p & bit)==0) {
+                     if (*p > 0)
+                        *p += bit;
+                     else
+                        *p -= bit;
+                  }
+         }
+      } else {
+         k = j->spec_start;
+         do {
+            int r,s;
+            int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh
+            if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+            s = rs & 15;
+            r = rs >> 4;
+            if (s == 0) {
+               if (r < 15) {
+                  j->eob_run = (1 << r) - 1;
+                  if (r)
+                     j->eob_run += stbi__jpeg_get_bits(j, r);
+                  r = 64; // force end of block
+               } else {
+                  // r=15 s=0 should write 16 0s, so we just do
+                  // a run of 15 0s and then write s (which is 0),
+                  // so we don't have to do anything special here
+               }
+            } else {
+               if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG");
+               // sign bit
+               if (stbi__jpeg_get_bit(j))
+                  s = bit;
+               else
+                  s = -bit;
+            }
+
+            // advance by r
+            while (k <= j->spec_end) {
+               short *p = &data[stbi__jpeg_dezigzag[k++]];
+               if (*p != 0) {
+                  if (stbi__jpeg_get_bit(j))
+                     if ((*p & bit)==0) {
+                        if (*p > 0)
+                           *p += bit;
+                        else
+                           *p -= bit;
+                     }
+               } else {
+                  if (r == 0) {
+                     *p = (short) s;
+                     break;
+                  }
+                  --r;
+               }
+            }
+         } while (k <= j->spec_end);
+      }
+   }
+   return 1;
+}
+
+// take a -128..127 value and stbi__clamp it and convert to 0..255
+stbi_inline static stbi_uc stbi__clamp(int x)
+{
+   // trick to use a single test to catch both cases
+   if ((unsigned int) x > 255) {
+      if (x < 0) return 0;
+      if (x > 255) return 255;
+   }
+   return (stbi_uc) x;
+}
+
+#define stbi__f2f(x)  ((int) (((x) * 4096 + 0.5)))
+#define stbi__fsh(x)  ((x) * 4096)
+
+// derived from jidctint -- DCT_ISLOW
+#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \
+   int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \
+   p2 = s2;                                    \
+   p3 = s6;                                    \
+   p1 = (p2+p3) * stbi__f2f(0.5411961f);       \
+   t2 = p1 + p3*stbi__f2f(-1.847759065f);      \
+   t3 = p1 + p2*stbi__f2f( 0.765366865f);      \
+   p2 = s0;                                    \
+   p3 = s4;                                    \
+   t0 = stbi__fsh(p2+p3);                      \
+   t1 = stbi__fsh(p2-p3);                      \
+   x0 = t0+t3;                                 \
+   x3 = t0-t3;                                 \
+   x1 = t1+t2;                                 \
+   x2 = t1-t2;                                 \
+   t0 = s7;                                    \
+   t1 = s5;                                    \
+   t2 = s3;                                    \
+   t3 = s1;                                    \
+   p3 = t0+t2;                                 \
+   p4 = t1+t3;                                 \
+   p1 = t0+t3;                                 \
+   p2 = t1+t2;                                 \
+   p5 = (p3+p4)*stbi__f2f( 1.175875602f);      \
+   t0 = t0*stbi__f2f( 0.298631336f);           \
+   t1 = t1*stbi__f2f( 2.053119869f);           \
+   t2 = t2*stbi__f2f( 3.072711026f);           \
+   t3 = t3*stbi__f2f( 1.501321110f);           \
+   p1 = p5 + p1*stbi__f2f(-0.899976223f);      \
+   p2 = p5 + p2*stbi__f2f(-2.562915447f);      \
+   p3 = p3*stbi__f2f(-1.961570560f);           \
+   p4 = p4*stbi__f2f(-0.390180644f);           \
+   t3 += p1+p4;                                \
+   t2 += p2+p3;                                \
+   t1 += p2+p4;                                \
+   t0 += p1+p3;
+
+static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64])
+{
+   int i,val[64],*v=val;
+   stbi_uc *o;
+   short *d = data;
+
+   // columns
+   for (i=0; i < 8; ++i,++d, ++v) {
+      // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
+      if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
+           && d[40]==0 && d[48]==0 && d[56]==0) {
+         //    no shortcut                 0     seconds
+         //    (1|2|3|4|5|6|7)==0          0     seconds
+         //    all separate               -0.047 seconds
+         //    1 && 2|3 && 4|5 && 6|7:    -0.047 seconds
+         int dcterm = d[0]*4;
+         v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
+      } else {
+         STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56])
+         // constants scaled things up by 1<<12; let's bring them back
+         // down, but keep 2 extra bits of precision
+         x0 += 512; x1 += 512; x2 += 512; x3 += 512;
+         v[ 0] = (x0+t3) >> 10;
+         v[56] = (x0-t3) >> 10;
+         v[ 8] = (x1+t2) >> 10;
+         v[48] = (x1-t2) >> 10;
+         v[16] = (x2+t1) >> 10;
+         v[40] = (x2-t1) >> 10;
+         v[24] = (x3+t0) >> 10;
+         v[32] = (x3-t0) >> 10;
+      }
+   }
+
+   for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
+      // no fast case since the first 1D IDCT spread components out
+      STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
+      // constants scaled things up by 1<<12, plus we had 1<<2 from first
+      // loop, plus horizontal and vertical each scale by sqrt(8) so together
+      // we've got an extra 1<<3, so 1<<17 total we need to remove.
+      // so we want to round that, which means adding 0.5 * 1<<17,
+      // aka 65536. Also, we'll end up with -128 to 127 that we want
+      // to encode as 0..255 by adding 128, so we'll add that before the shift
+      x0 += 65536 + (128<<17);
+      x1 += 65536 + (128<<17);
+      x2 += 65536 + (128<<17);
+      x3 += 65536 + (128<<17);
+      // tried computing the shifts into temps, or'ing the temps to see
+      // if any were out of range, but that was slower
+      o[0] = stbi__clamp((x0+t3) >> 17);
+      o[7] = stbi__clamp((x0-t3) >> 17);
+      o[1] = stbi__clamp((x1+t2) >> 17);
+      o[6] = stbi__clamp((x1-t2) >> 17);
+      o[2] = stbi__clamp((x2+t1) >> 17);
+      o[5] = stbi__clamp((x2-t1) >> 17);
+      o[3] = stbi__clamp((x3+t0) >> 17);
+      o[4] = stbi__clamp((x3-t0) >> 17);
+   }
+}
+
+#ifdef STBI_SSE2
+// sse2 integer IDCT. not the fastest possible implementation but it
+// produces bit-identical results to the generic C version so it's
+// fully "transparent".
+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
+{
+   // This is constructed to match our regular (generic) integer IDCT exactly.
+   __m128i row0, row1, row2, row3, row4, row5, row6, row7;
+   __m128i tmp;
+
+   // dot product constant: even elems=x, odd elems=y
+   #define dct_const(x,y)  _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y))
+
+   // out(0) = c0[even]*x + c0[odd]*y   (c0, x, y 16-bit, out 32-bit)
+   // out(1) = c1[even]*x + c1[odd]*y
+   #define dct_rot(out0,out1, x,y,c0,c1) \
+      __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \
+      __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \
+      __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \
+      __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \
+      __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \
+      __m128i out1##_h = _mm_madd_epi16(c0##hi, c1)
+
+   // out = in << 12  (in 16-bit, out 32-bit)
+   #define dct_widen(out, in) \
+      __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \
+      __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4)
+
+   // wide add
+   #define dct_wadd(out, a, b) \
+      __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \
+      __m128i out##_h = _mm_add_epi32(a##_h, b##_h)
+
+   // wide sub
+   #define dct_wsub(out, a, b) \
+      __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \
+      __m128i out##_h = _mm_sub_epi32(a##_h, b##_h)
+
+   // butterfly a/b, add bias, then shift by "s" and pack
+   #define dct_bfly32o(out0, out1, a,b,bias,s) \
+      { \
+         __m128i abiased_l = _mm_add_epi32(a##_l, bias); \
+         __m128i abiased_h = _mm_add_epi32(a##_h, bias); \
+         dct_wadd(sum, abiased, b); \
+         dct_wsub(dif, abiased, b); \
+         out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \
+         out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \
+      }
+
+   // 8-bit interleave step (for transposes)
+   #define dct_interleave8(a, b) \
+      tmp = a; \
+      a = _mm_unpacklo_epi8(a, b); \
+      b = _mm_unpackhi_epi8(tmp, b)
+
+   // 16-bit interleave step (for transposes)
+   #define dct_interleave16(a, b) \
+      tmp = a; \
+      a = _mm_unpacklo_epi16(a, b); \
+      b = _mm_unpackhi_epi16(tmp, b)
+
+   #define dct_pass(bias,shift) \
+      { \
+         /* even part */ \
+         dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \
+         __m128i sum04 = _mm_add_epi16(row0, row4); \
+         __m128i dif04 = _mm_sub_epi16(row0, row4); \
+         dct_widen(t0e, sum04); \
+         dct_widen(t1e, dif04); \
+         dct_wadd(x0, t0e, t3e); \
+         dct_wsub(x3, t0e, t3e); \
+         dct_wadd(x1, t1e, t2e); \
+         dct_wsub(x2, t1e, t2e); \
+         /* odd part */ \
+         dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \
+         dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \
+         __m128i sum17 = _mm_add_epi16(row1, row7); \
+         __m128i sum35 = _mm_add_epi16(row3, row5); \
+         dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \
+         dct_wadd(x4, y0o, y4o); \
+         dct_wadd(x5, y1o, y5o); \
+         dct_wadd(x6, y2o, y5o); \
+         dct_wadd(x7, y3o, y4o); \
+         dct_bfly32o(row0,row7, x0,x7,bias,shift); \
+         dct_bfly32o(row1,row6, x1,x6,bias,shift); \
+         dct_bfly32o(row2,row5, x2,x5,bias,shift); \
+         dct_bfly32o(row3,row4, x3,x4,bias,shift); \
+      }
+
+   __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f));
+   __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f));
+   __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f));
+   __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f));
+   __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f));
+   __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f));
+   __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f));
+   __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f));
+
+   // rounding biases in column/row passes, see stbi__idct_block for explanation.
+   __m128i bias_0 = _mm_set1_epi32(512);
+   __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17));
+
+   // load
+   row0 = _mm_load_si128((const __m128i *) (data + 0*8));
+   row1 = _mm_load_si128((const __m128i *) (data + 1*8));
+   row2 = _mm_load_si128((const __m128i *) (data + 2*8));
+   row3 = _mm_load_si128((const __m128i *) (data + 3*8));
+   row4 = _mm_load_si128((const __m128i *) (data + 4*8));
+   row5 = _mm_load_si128((const __m128i *) (data + 5*8));
+   row6 = _mm_load_si128((const __m128i *) (data + 6*8));
+   row7 = _mm_load_si128((const __m128i *) (data + 7*8));
+
+   // column pass
+   dct_pass(bias_0, 10);
+
+   {
+      // 16bit 8x8 transpose pass 1
+      dct_interleave16(row0, row4);
+      dct_interleave16(row1, row5);
+      dct_interleave16(row2, row6);
+      dct_interleave16(row3, row7);
+
+      // transpose pass 2
+      dct_interleave16(row0, row2);
+      dct_interleave16(row1, row3);
+      dct_interleave16(row4, row6);
+      dct_interleave16(row5, row7);
+
+      // transpose pass 3
+      dct_interleave16(row0, row1);
+      dct_interleave16(row2, row3);
+      dct_interleave16(row4, row5);
+      dct_interleave16(row6, row7);
+   }
+
+   // row pass
+   dct_pass(bias_1, 17);
+
+   {
+      // pack
+      __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7
+      __m128i p1 = _mm_packus_epi16(row2, row3);
+      __m128i p2 = _mm_packus_epi16(row4, row5);
+      __m128i p3 = _mm_packus_epi16(row6, row7);
+
+      // 8bit 8x8 transpose pass 1
+      dct_interleave8(p0, p2); // a0e0a1e1...
+      dct_interleave8(p1, p3); // c0g0c1g1...
+
+      // transpose pass 2
+      dct_interleave8(p0, p1); // a0c0e0g0...
+      dct_interleave8(p2, p3); // b0d0f0h0...
+
+      // transpose pass 3
+      dct_interleave8(p0, p2); // a0b0c0d0...
+      dct_interleave8(p1, p3); // a4b4c4d4...
+
+      // store
+      _mm_storel_epi64((__m128i *) out, p0); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, p2); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, p1); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, p3); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e));
+   }
+
+#undef dct_const
+#undef dct_rot
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_interleave8
+#undef dct_interleave16
+#undef dct_pass
+}
+
+#endif // STBI_SSE2
+
+#ifdef STBI_NEON
+
+// NEON integer IDCT. should produce bit-identical
+// results to the generic C version.
+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
+{
+   int16x8_t row0, row1, row2, row3, row4, row5, row6, row7;
+
+   int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f));
+   int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f));
+   int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f));
+   int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f));
+   int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f));
+   int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f));
+   int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f));
+   int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f));
+   int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f));
+   int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f));
+   int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f));
+   int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f));
+
+#define dct_long_mul(out, inq, coeff) \
+   int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \
+   int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff)
+
+#define dct_long_mac(out, acc, inq, coeff) \
+   int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \
+   int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff)
+
+#define dct_widen(out, inq) \
+   int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \
+   int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12)
+
+// wide add
+#define dct_wadd(out, a, b) \
+   int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \
+   int32x4_t out##_h = vaddq_s32(a##_h, b##_h)
+
+// wide sub
+#define dct_wsub(out, a, b) \
+   int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \
+   int32x4_t out##_h = vsubq_s32(a##_h, b##_h)
+
+// butterfly a/b, then shift using "shiftop" by "s" and pack
+#define dct_bfly32o(out0,out1, a,b,shiftop,s) \
+   { \
+      dct_wadd(sum, a, b); \
+      dct_wsub(dif, a, b); \
+      out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \
+      out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \
+   }
+
+#define dct_pass(shiftop, shift) \
+   { \
+      /* even part */ \
+      int16x8_t sum26 = vaddq_s16(row2, row6); \
+      dct_long_mul(p1e, sum26, rot0_0); \
+      dct_long_mac(t2e, p1e, row6, rot0_1); \
+      dct_long_mac(t3e, p1e, row2, rot0_2); \
+      int16x8_t sum04 = vaddq_s16(row0, row4); \
+      int16x8_t dif04 = vsubq_s16(row0, row4); \
+      dct_widen(t0e, sum04); \
+      dct_widen(t1e, dif04); \
+      dct_wadd(x0, t0e, t3e); \
+      dct_wsub(x3, t0e, t3e); \
+      dct_wadd(x1, t1e, t2e); \
+      dct_wsub(x2, t1e, t2e); \
+      /* odd part */ \
+      int16x8_t sum15 = vaddq_s16(row1, row5); \
+      int16x8_t sum17 = vaddq_s16(row1, row7); \
+      int16x8_t sum35 = vaddq_s16(row3, row5); \
+      int16x8_t sum37 = vaddq_s16(row3, row7); \
+      int16x8_t sumodd = vaddq_s16(sum17, sum35); \
+      dct_long_mul(p5o, sumodd, rot1_0); \
+      dct_long_mac(p1o, p5o, sum17, rot1_1); \
+      dct_long_mac(p2o, p5o, sum35, rot1_2); \
+      dct_long_mul(p3o, sum37, rot2_0); \
+      dct_long_mul(p4o, sum15, rot2_1); \
+      dct_wadd(sump13o, p1o, p3o); \
+      dct_wadd(sump24o, p2o, p4o); \
+      dct_wadd(sump23o, p2o, p3o); \
+      dct_wadd(sump14o, p1o, p4o); \
+      dct_long_mac(x4, sump13o, row7, rot3_0); \
+      dct_long_mac(x5, sump24o, row5, rot3_1); \
+      dct_long_mac(x6, sump23o, row3, rot3_2); \
+      dct_long_mac(x7, sump14o, row1, rot3_3); \
+      dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \
+      dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \
+      dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \
+      dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \
+   }
+
+   // load
+   row0 = vld1q_s16(data + 0*8);
+   row1 = vld1q_s16(data + 1*8);
+   row2 = vld1q_s16(data + 2*8);
+   row3 = vld1q_s16(data + 3*8);
+   row4 = vld1q_s16(data + 4*8);
+   row5 = vld1q_s16(data + 5*8);
+   row6 = vld1q_s16(data + 6*8);
+   row7 = vld1q_s16(data + 7*8);
+
+   // add DC bias
+   row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0));
+
+   // column pass
+   dct_pass(vrshrn_n_s32, 10);
+
+   // 16bit 8x8 transpose
+   {
+// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively.
+// whether compilers actually get this is another story, sadly.
+#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; }
+#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); }
+#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); }
+
+      // pass 1
+      dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6
+      dct_trn16(row2, row3);
+      dct_trn16(row4, row5);
+      dct_trn16(row6, row7);
+
+      // pass 2
+      dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4
+      dct_trn32(row1, row3);
+      dct_trn32(row4, row6);
+      dct_trn32(row5, row7);
+
+      // pass 3
+      dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0
+      dct_trn64(row1, row5);
+      dct_trn64(row2, row6);
+      dct_trn64(row3, row7);
+
+#undef dct_trn16
+#undef dct_trn32
+#undef dct_trn64
+   }
+
+   // row pass
+   // vrshrn_n_s32 only supports shifts up to 16, we need
+   // 17. so do a non-rounding shift of 16 first then follow
+   // up with a rounding shift by 1.
+   dct_pass(vshrn_n_s32, 16);
+
+   {
+      // pack and round
+      uint8x8_t p0 = vqrshrun_n_s16(row0, 1);
+      uint8x8_t p1 = vqrshrun_n_s16(row1, 1);
+      uint8x8_t p2 = vqrshrun_n_s16(row2, 1);
+      uint8x8_t p3 = vqrshrun_n_s16(row3, 1);
+      uint8x8_t p4 = vqrshrun_n_s16(row4, 1);
+      uint8x8_t p5 = vqrshrun_n_s16(row5, 1);
+      uint8x8_t p6 = vqrshrun_n_s16(row6, 1);
+      uint8x8_t p7 = vqrshrun_n_s16(row7, 1);
+
+      // again, these can translate into one instruction, but often don't.
+#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; }
+#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); }
+#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); }
+
+      // sadly can't use interleaved stores here since we only write
+      // 8 bytes to each scan line!
+
+      // 8x8 8-bit transpose pass 1
+      dct_trn8_8(p0, p1);
+      dct_trn8_8(p2, p3);
+      dct_trn8_8(p4, p5);
+      dct_trn8_8(p6, p7);
+
+      // pass 2
+      dct_trn8_16(p0, p2);
+      dct_trn8_16(p1, p3);
+      dct_trn8_16(p4, p6);
+      dct_trn8_16(p5, p7);
+
+      // pass 3
+      dct_trn8_32(p0, p4);
+      dct_trn8_32(p1, p5);
+      dct_trn8_32(p2, p6);
+      dct_trn8_32(p3, p7);
+
+      // store
+      vst1_u8(out, p0); out += out_stride;
+      vst1_u8(out, p1); out += out_stride;
+      vst1_u8(out, p2); out += out_stride;
+      vst1_u8(out, p3); out += out_stride;
+      vst1_u8(out, p4); out += out_stride;
+      vst1_u8(out, p5); out += out_stride;
+      vst1_u8(out, p6); out += out_stride;
+      vst1_u8(out, p7);
+
+#undef dct_trn8_8
+#undef dct_trn8_16
+#undef dct_trn8_32
+   }
+
+#undef dct_long_mul
+#undef dct_long_mac
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_pass
+}
+
+#endif // STBI_NEON
+
+#define STBI__MARKER_none  0xff
+// if there's a pending marker from the entropy stream, return that
+// otherwise, fetch from the stream and get a marker. if there's no
+// marker, return 0xff, which is never a valid marker value
+static stbi_uc stbi__get_marker(stbi__jpeg *j)
+{
+   stbi_uc x;
+   if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; }
+   x = stbi__get8(j->s);
+   if (x != 0xff) return STBI__MARKER_none;
+   while (x == 0xff)
+      x = stbi__get8(j->s); // consume repeated 0xff fill bytes
+   return x;
+}
+
+// in each scan, we'll have scan_n components, and the order
+// of the components is specified by order[]
+#define STBI__RESTART(x)     ((x) >= 0xd0 && (x) <= 0xd7)
+
+// after a restart interval, stbi__jpeg_reset the entropy decoder and
+// the dc prediction
+static void stbi__jpeg_reset(stbi__jpeg *j)
+{
+   j->code_bits = 0;
+   j->code_buffer = 0;
+   j->nomore = 0;
+   j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = j->img_comp[3].dc_pred = 0;
+   j->marker = STBI__MARKER_none;
+   j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
+   j->eob_run = 0;
+   // no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
+   // since we don't even allow 1<<30 pixels
+}
+
+static int stbi__parse_entropy_coded_data(stbi__jpeg *z)
+{
+   stbi__jpeg_reset(z);
+   if (!z->progressive) {
+      if (z->scan_n == 1) {
+         int i,j;
+         STBI_SIMD_ALIGN(short, data[64]);
+         int n = z->order[0];
+         // non-interleaved data, we just need to process one block at a time,
+         // in trivial scanline order
+         // number of blocks to do just depends on how many actual "pixels" this
+         // component has, independent of interleaved MCU blocking and such
+         int w = (z->img_comp[n].x+7) >> 3;
+         int h = (z->img_comp[n].y+7) >> 3;
+         for (j=0; j < h; ++j) {
+            for (i=0; i < w; ++i) {
+               int ha = z->img_comp[n].ha;
+               if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
+               z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
+               // every data block is an MCU, so countdown the restart interval
+               if (--z->todo <= 0) {
+                  if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+                  // if it's NOT a restart, then just bail, so we get corrupt data
+                  // rather than no data
+                  if (!STBI__RESTART(z->marker)) return 1;
+                  stbi__jpeg_reset(z);
+               }
+            }
+         }
+         return 1;
+      } else { // interleaved
+         int i,j,k,x,y;
+         STBI_SIMD_ALIGN(short, data[64]);
+         for (j=0; j < z->img_mcu_y; ++j) {
+            for (i=0; i < z->img_mcu_x; ++i) {
+               // scan an interleaved mcu... process scan_n components in order
+               for (k=0; k < z->scan_n; ++k) {
+                  int n = z->order[k];
+                  // scan out an mcu's worth of this component; that's just determined
+                  // by the basic H and V specified for the component
+                  for (y=0; y < z->img_comp[n].v; ++y) {
+                     for (x=0; x < z->img_comp[n].h; ++x) {
+                        int x2 = (i*z->img_comp[n].h + x)*8;
+                        int y2 = (j*z->img_comp[n].v + y)*8;
+                        int ha = z->img_comp[n].ha;
+                        if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
+                        z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data);
+                     }
+                  }
+               }
+               // after all interleaved components, that's an interleaved MCU,
+               // so now count down the restart interval
+               if (--z->todo <= 0) {
+                  if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+                  if (!STBI__RESTART(z->marker)) return 1;
+                  stbi__jpeg_reset(z);
+               }
+            }
+         }
+         return 1;
+      }
+   } else {
+      if (z->scan_n == 1) {
+         int i,j;
+         int n = z->order[0];
+         // non-interleaved data, we just need to process one block at a time,
+         // in trivial scanline order
+         // number of blocks to do just depends on how many actual "pixels" this
+         // component has, independent of interleaved MCU blocking and such
+         int w = (z->img_comp[n].x+7) >> 3;
+         int h = (z->img_comp[n].y+7) >> 3;
+         for (j=0; j < h; ++j) {
+            for (i=0; i < w; ++i) {
+               short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+               if (z->spec_start == 0) {
+                  if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
+                     return 0;
+               } else {
+                  int ha = z->img_comp[n].ha;
+                  if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha]))
+                     return 0;
+               }
+               // every data block is an MCU, so countdown the restart interval
+               if (--z->todo <= 0) {
+                  if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+                  if (!STBI__RESTART(z->marker)) return 1;
+                  stbi__jpeg_reset(z);
+               }
+            }
+         }
+         return 1;
+      } else { // interleaved
+         int i,j,k,x,y;
+         for (j=0; j < z->img_mcu_y; ++j) {
+            for (i=0; i < z->img_mcu_x; ++i) {
+               // scan an interleaved mcu... process scan_n components in order
+               for (k=0; k < z->scan_n; ++k) {
+                  int n = z->order[k];
+                  // scan out an mcu's worth of this component; that's just determined
+                  // by the basic H and V specified for the component
+                  for (y=0; y < z->img_comp[n].v; ++y) {
+                     for (x=0; x < z->img_comp[n].h; ++x) {
+                        int x2 = (i*z->img_comp[n].h + x);
+                        int y2 = (j*z->img_comp[n].v + y);
+                        short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w);
+                        if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
+                           return 0;
+                     }
+                  }
+               }
+               // after all interleaved components, that's an interleaved MCU,
+               // so now count down the restart interval
+               if (--z->todo <= 0) {
+                  if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+                  if (!STBI__RESTART(z->marker)) return 1;
+                  stbi__jpeg_reset(z);
+               }
+            }
+         }
+         return 1;
+      }
+   }
+}
+
+static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant)
+{
+   int i;
+   for (i=0; i < 64; ++i)
+      data[i] *= dequant[i];
+}
+
+static void stbi__jpeg_finish(stbi__jpeg *z)
+{
+   if (z->progressive) {
+      // dequantize and idct the data
+      int i,j,n;
+      for (n=0; n < z->s->img_n; ++n) {
+         int w = (z->img_comp[n].x+7) >> 3;
+         int h = (z->img_comp[n].y+7) >> 3;
+         for (j=0; j < h; ++j) {
+            for (i=0; i < w; ++i) {
+               short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+               stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]);
+               z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
+            }
+         }
+      }
+   }
+}
+
+static int stbi__process_marker(stbi__jpeg *z, int m)
+{
+   int L;
+   switch (m) {
+      case STBI__MARKER_none: // no marker found
+         return stbi__err("expected marker","Corrupt JPEG");
+
+      case 0xDD: // DRI - specify restart interval
+         if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG");
+         z->restart_interval = stbi__get16be(z->s);
+         return 1;
+
+      case 0xDB: // DQT - define quantization table
+         L = stbi__get16be(z->s)-2;
+         while (L > 0) {
+            int q = stbi__get8(z->s);
+            int p = q >> 4, sixteen = (p != 0);
+            int t = q & 15,i;
+            if (p != 0 && p != 1) return stbi__err("bad DQT type","Corrupt JPEG");
+            if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG");
+
+            for (i=0; i < 64; ++i)
+               z->dequant[t][stbi__jpeg_dezigzag[i]] = (stbi__uint16)(sixteen ? stbi__get16be(z->s) : stbi__get8(z->s));
+            L -= (sixteen ? 129 : 65);
+         }
+         return L==0;
+
+      case 0xC4: // DHT - define huffman table
+         L = stbi__get16be(z->s)-2;
+         while (L > 0) {
+            stbi_uc *v;
+            int sizes[16],i,n=0;
+            int q = stbi__get8(z->s);
+            int tc = q >> 4;
+            int th = q & 15;
+            if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG");
+            for (i=0; i < 16; ++i) {
+               sizes[i] = stbi__get8(z->s);
+               n += sizes[i];
+            }
+            L -= 17;
+            if (tc == 0) {
+               if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0;
+               v = z->huff_dc[th].values;
+            } else {
+               if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0;
+               v = z->huff_ac[th].values;
+            }
+            for (i=0; i < n; ++i)
+               v[i] = stbi__get8(z->s);
+            if (tc != 0)
+               stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th);
+            L -= n;
+         }
+         return L==0;
+   }
+
+   // check for comment block or APP blocks
+   if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
+      L = stbi__get16be(z->s);
+      if (L < 2) {
+         if (m == 0xFE)
+            return stbi__err("bad COM len","Corrupt JPEG");
+         else
+            return stbi__err("bad APP len","Corrupt JPEG");
+      }
+      L -= 2;
+
+      if (m == 0xE0 && L >= 5) { // JFIF APP0 segment
+         static const unsigned char tag[5] = {'J','F','I','F','\0'};
+         int ok = 1;
+         int i;
+         for (i=0; i < 5; ++i)
+            if (stbi__get8(z->s) != tag[i])
+               ok = 0;
+         L -= 5;
+         if (ok)
+            z->jfif = 1;
+      } else if (m == 0xEE && L >= 12) { // Adobe APP14 segment
+         static const unsigned char tag[6] = {'A','d','o','b','e','\0'};
+         int ok = 1;
+         int i;
+         for (i=0; i < 6; ++i)
+            if (stbi__get8(z->s) != tag[i])
+               ok = 0;
+         L -= 6;
+         if (ok) {
+            stbi__get8(z->s); // version
+            stbi__get16be(z->s); // flags0
+            stbi__get16be(z->s); // flags1
+            z->app14_color_transform = stbi__get8(z->s); // color transform
+            L -= 6;
+         }
+      }
+
+      stbi__skip(z->s, L);
+      return 1;
+   }
+
+   return stbi__err("unknown marker","Corrupt JPEG");
+}
+
+// after we see SOS
+static int stbi__process_scan_header(stbi__jpeg *z)
+{
+   int i;
+   int Ls = stbi__get16be(z->s);
+   z->scan_n = stbi__get8(z->s);
+   if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG");
+   if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG");
+   for (i=0; i < z->scan_n; ++i) {
+      int id = stbi__get8(z->s), which;
+      int q = stbi__get8(z->s);
+      for (which = 0; which < z->s->img_n; ++which)
+         if (z->img_comp[which].id == id)
+            break;
+      if (which == z->s->img_n) return 0; // no match
+      z->img_comp[which].hd = q >> 4;   if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG");
+      z->img_comp[which].ha = q & 15;   if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG");
+      z->order[i] = which;
+   }
+
+   {
+      int aa;
+      z->spec_start = stbi__get8(z->s);
+      z->spec_end   = stbi__get8(z->s); // should be 63, but might be 0
+      aa = stbi__get8(z->s);
+      z->succ_high = (aa >> 4);
+      z->succ_low  = (aa & 15);
+      if (z->progressive) {
+         if (z->spec_start > 63 || z->spec_end > 63  || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13)
+            return stbi__err("bad SOS", "Corrupt JPEG");
+      } else {
+         if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG");
+         if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG");
+         z->spec_end = 63;
+      }
+   }
+
+   return 1;
+}
+
+static int stbi__free_jpeg_components(stbi__jpeg *z, int ncomp, int why)
+{
+   int i;
+   for (i=0; i < ncomp; ++i) {
+      if (z->img_comp[i].raw_data) {
+         STBI_FREE(z->img_comp[i].raw_data);
+         z->img_comp[i].raw_data = NULL;
+         z->img_comp[i].data = NULL;
+      }
+      if (z->img_comp[i].raw_coeff) {
+         STBI_FREE(z->img_comp[i].raw_coeff);
+         z->img_comp[i].raw_coeff = 0;
+         z->img_comp[i].coeff = 0;
+      }
+      if (z->img_comp[i].linebuf) {
+         STBI_FREE(z->img_comp[i].linebuf);
+         z->img_comp[i].linebuf = NULL;
+      }
+   }
+   return why;
+}
+
+static int stbi__process_frame_header(stbi__jpeg *z, int scan)
+{
+   stbi__context *s = z->s;
+   int Lf,p,i,q, h_max=1,v_max=1,c;
+   Lf = stbi__get16be(s);         if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG
+   p  = stbi__get8(s);            if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
+   s->img_y = stbi__get16be(s);   if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG
+   s->img_x = stbi__get16be(s);   if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires
+   if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)");
+   if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)");
+   c = stbi__get8(s);
+   if (c != 3 && c != 1 && c != 4) return stbi__err("bad component count","Corrupt JPEG");
+   s->img_n = c;
+   for (i=0; i < c; ++i) {
+      z->img_comp[i].data = NULL;
+      z->img_comp[i].linebuf = NULL;
+   }
+
+   if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG");
+
+   z->rgb = 0;
+   for (i=0; i < s->img_n; ++i) {
+      static const unsigned char rgb[3] = { 'R', 'G', 'B' };
+      z->img_comp[i].id = stbi__get8(s);
+      if (s->img_n == 3 && z->img_comp[i].id == rgb[i])
+         ++z->rgb;
+      q = stbi__get8(s);
+      z->img_comp[i].h = (q >> 4);  if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG");
+      z->img_comp[i].v = q & 15;    if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG");
+      z->img_comp[i].tq = stbi__get8(s);  if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG");
+   }
+
+   if (scan != STBI__SCAN_load) return 1;
+
+   if (!stbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0)) return stbi__err("too large", "Image too large to decode");
+
+   for (i=0; i < s->img_n; ++i) {
+      if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h;
+      if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
+   }
+
+   // compute interleaved mcu info
+   z->img_h_max = h_max;
+   z->img_v_max = v_max;
+   z->img_mcu_w = h_max * 8;
+   z->img_mcu_h = v_max * 8;
+   // these sizes can't be more than 17 bits
+   z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w;
+   z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h;
+
+   for (i=0; i < s->img_n; ++i) {
+      // number of effective pixels (e.g. for non-interleaved MCU)
+      z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max;
+      z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max;
+      // to simplify generation, we'll allocate enough memory to decode
+      // the bogus oversized data from using interleaved MCUs and their
+      // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
+      // discard the extra data until colorspace conversion
+      //
+      // img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked earlier)
+      // so these muls can't overflow with 32-bit ints (which we require)
+      z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
+      z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
+      z->img_comp[i].coeff = 0;
+      z->img_comp[i].raw_coeff = 0;
+      z->img_comp[i].linebuf = NULL;
+      z->img_comp[i].raw_data = stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15);
+      if (z->img_comp[i].raw_data == NULL)
+         return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory"));
+      // align blocks for idct using mmx/sse
+      z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15);
+      if (z->progressive) {
+         // w2, h2 are multiples of 8 (see above)
+         z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8;
+         z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8;
+         z->img_comp[i].raw_coeff = stbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15);
+         if (z->img_comp[i].raw_coeff == NULL)
+            return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory"));
+         z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15);
+      }
+   }
+
+   return 1;
+}
+
+// use comparisons since in some cases we handle more than one case (e.g. SOF)
+#define stbi__DNL(x)         ((x) == 0xdc)
+#define stbi__SOI(x)         ((x) == 0xd8)
+#define stbi__EOI(x)         ((x) == 0xd9)
+#define stbi__SOF(x)         ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2)
+#define stbi__SOS(x)         ((x) == 0xda)
+
+#define stbi__SOF_progressive(x)   ((x) == 0xc2)
+
+static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
+{
+   int m;
+   z->jfif = 0;
+   z->app14_color_transform = -1; // valid values are 0,1,2
+   z->marker = STBI__MARKER_none; // initialize cached marker to empty
+   m = stbi__get_marker(z);
+   if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG");
+   if (scan == STBI__SCAN_type) return 1;
+   m = stbi__get_marker(z);
+   while (!stbi__SOF(m)) {
+      if (!stbi__process_marker(z,m)) return 0;
+      m = stbi__get_marker(z);
+      while (m == STBI__MARKER_none) {
+         // some files have extra padding after their blocks, so ok, we'll scan
+         if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG");
+         m = stbi__get_marker(z);
+      }
+   }
+   z->progressive = stbi__SOF_progressive(m);
+   if (!stbi__process_frame_header(z, scan)) return 0;
+   return 1;
+}
+
+// decode image to YCbCr format
+static int stbi__decode_jpeg_image(stbi__jpeg *j)
+{
+   int m;
+   for (m = 0; m < 4; m++) {
+      j->img_comp[m].raw_data = NULL;
+      j->img_comp[m].raw_coeff = NULL;
+   }
+   j->restart_interval = 0;
+   if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0;
+   m = stbi__get_marker(j);
+   while (!stbi__EOI(m)) {
+      if (stbi__SOS(m)) {
+         if (!stbi__process_scan_header(j)) return 0;
+         if (!stbi__parse_entropy_coded_data(j)) return 0;
+         if (j->marker == STBI__MARKER_none ) {
+            // handle 0s at the end of image data from IP Kamera 9060
+            while (!stbi__at_eof(j->s)) {
+               int x = stbi__get8(j->s);
+               if (x == 255) {
+                  j->marker = stbi__get8(j->s);
+                  break;
+               }
+            }
+            // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0
+         }
+      } else if (stbi__DNL(m)) {
+         int Ld = stbi__get16be(j->s);
+         stbi__uint32 NL = stbi__get16be(j->s);
+         if (Ld != 4) return stbi__err("bad DNL len", "Corrupt JPEG");
+         if (NL != j->s->img_y) return stbi__err("bad DNL height", "Corrupt JPEG");
+      } else {
+         if (!stbi__process_marker(j, m)) return 0;
+      }
+      m = stbi__get_marker(j);
+   }
+   if (j->progressive)
+      stbi__jpeg_finish(j);
+   return 1;
+}
+
+// static jfif-centered resampling (across block boundaries)
+
+typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1,
+                                    int w, int hs);
+
+#define stbi__div4(x) ((stbi_uc) ((x) >> 2))
+
+static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   STBI_NOTUSED(out);
+   STBI_NOTUSED(in_far);
+   STBI_NOTUSED(w);
+   STBI_NOTUSED(hs);
+   return in_near;
+}
+
+static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // need to generate two samples vertically for every one in input
+   int i;
+   STBI_NOTUSED(hs);
+   for (i=0; i < w; ++i)
+      out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2);
+   return out;
+}
+
+static stbi_uc*  stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // need to generate two samples horizontally for every one in input
+   int i;
+   stbi_uc *input = in_near;
+
+   if (w == 1) {
+      // if only one sample, can't do any interpolation
+      out[0] = out[1] = input[0];
+      return out;
+   }
+
+   out[0] = input[0];
+   out[1] = stbi__div4(input[0]*3 + input[1] + 2);
+   for (i=1; i < w-1; ++i) {
+      int n = 3*input[i]+2;
+      out[i*2+0] = stbi__div4(n+input[i-1]);
+      out[i*2+1] = stbi__div4(n+input[i+1]);
+   }
+   out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2);
+   out[i*2+1] = input[w-1];
+
+   STBI_NOTUSED(in_far);
+   STBI_NOTUSED(hs);
+
+   return out;
+}
+
+#define stbi__div16(x) ((stbi_uc) ((x) >> 4))
+
+static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // need to generate 2x2 samples for every one in input
+   int i,t0,t1;
+   if (w == 1) {
+      out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
+      return out;
+   }
+
+   t1 = 3*in_near[0] + in_far[0];
+   out[0] = stbi__div4(t1+2);
+   for (i=1; i < w; ++i) {
+      t0 = t1;
+      t1 = 3*in_near[i]+in_far[i];
+      out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
+      out[i*2  ] = stbi__div16(3*t1 + t0 + 8);
+   }
+   out[w*2-1] = stbi__div4(t1+2);
+
+   STBI_NOTUSED(hs);
+
+   return out;
+}
+
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // need to generate 2x2 samples for every one in input
+   int i=0,t0,t1;
+
+   if (w == 1) {
+      out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
+      return out;
+   }
+
+   t1 = 3*in_near[0] + in_far[0];
+   // process groups of 8 pixels for as long as we can.
+   // note we can't handle the last pixel in a row in this loop
+   // because we need to handle the filter boundary conditions.
+   for (; i < ((w-1) & ~7); i += 8) {
+#if defined(STBI_SSE2)
+      // load and perform the vertical filtering pass
+      // this uses 3*x + y = 4*x + (y - x)
+      __m128i zero  = _mm_setzero_si128();
+      __m128i farb  = _mm_loadl_epi64((__m128i *) (in_far + i));
+      __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i));
+      __m128i farw  = _mm_unpacklo_epi8(farb, zero);
+      __m128i nearw = _mm_unpacklo_epi8(nearb, zero);
+      __m128i diff  = _mm_sub_epi16(farw, nearw);
+      __m128i nears = _mm_slli_epi16(nearw, 2);
+      __m128i curr  = _mm_add_epi16(nears, diff); // current row
+
+      // horizontal filter works the same based on shifted vers of current
+      // row. "prev" is current row shifted right by 1 pixel; we need to
+      // insert the previous pixel value (from t1).
+      // "next" is current row shifted left by 1 pixel, with first pixel
+      // of next block of 8 pixels added in.
+      __m128i prv0 = _mm_slli_si128(curr, 2);
+      __m128i nxt0 = _mm_srli_si128(curr, 2);
+      __m128i prev = _mm_insert_epi16(prv0, t1, 0);
+      __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7);
+
+      // horizontal filter, polyphase implementation since it's convenient:
+      // even pixels = 3*cur + prev = cur*4 + (prev - cur)
+      // odd  pixels = 3*cur + next = cur*4 + (next - cur)
+      // note the shared term.
+      __m128i bias  = _mm_set1_epi16(8);
+      __m128i curs = _mm_slli_epi16(curr, 2);
+      __m128i prvd = _mm_sub_epi16(prev, curr);
+      __m128i nxtd = _mm_sub_epi16(next, curr);
+      __m128i curb = _mm_add_epi16(curs, bias);
+      __m128i even = _mm_add_epi16(prvd, curb);
+      __m128i odd  = _mm_add_epi16(nxtd, curb);
+
+      // interleave even and odd pixels, then undo scaling.
+      __m128i int0 = _mm_unpacklo_epi16(even, odd);
+      __m128i int1 = _mm_unpackhi_epi16(even, odd);
+      __m128i de0  = _mm_srli_epi16(int0, 4);
+      __m128i de1  = _mm_srli_epi16(int1, 4);
+
+      // pack and write output
+      __m128i outv = _mm_packus_epi16(de0, de1);
+      _mm_storeu_si128((__m128i *) (out + i*2), outv);
+#elif defined(STBI_NEON)
+      // load and perform the vertical filtering pass
+      // this uses 3*x + y = 4*x + (y - x)
+      uint8x8_t farb  = vld1_u8(in_far + i);
+      uint8x8_t nearb = vld1_u8(in_near + i);
+      int16x8_t diff  = vreinterpretq_s16_u16(vsubl_u8(farb, nearb));
+      int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2));
+      int16x8_t curr  = vaddq_s16(nears, diff); // current row
+
+      // horizontal filter works the same based on shifted vers of current
+      // row. "prev" is current row shifted right by 1 pixel; we need to
+      // insert the previous pixel value (from t1).
+      // "next" is current row shifted left by 1 pixel, with first pixel
+      // of next block of 8 pixels added in.
+      int16x8_t prv0 = vextq_s16(curr, curr, 7);
+      int16x8_t nxt0 = vextq_s16(curr, curr, 1);
+      int16x8_t prev = vsetq_lane_s16(t1, prv0, 0);
+      int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7);
+
+      // horizontal filter, polyphase implementation since it's convenient:
+      // even pixels = 3*cur + prev = cur*4 + (prev - cur)
+      // odd  pixels = 3*cur + next = cur*4 + (next - cur)
+      // note the shared term.
+      int16x8_t curs = vshlq_n_s16(curr, 2);
+      int16x8_t prvd = vsubq_s16(prev, curr);
+      int16x8_t nxtd = vsubq_s16(next, curr);
+      int16x8_t even = vaddq_s16(curs, prvd);
+      int16x8_t odd  = vaddq_s16(curs, nxtd);
+
+      // undo scaling and round, then store with even/odd phases interleaved
+      uint8x8x2_t o;
+      o.val[0] = vqrshrun_n_s16(even, 4);
+      o.val[1] = vqrshrun_n_s16(odd,  4);
+      vst2_u8(out + i*2, o);
+#endif
+
+      // "previous" value for next iter
+      t1 = 3*in_near[i+7] + in_far[i+7];
+   }
+
+   t0 = t1;
+   t1 = 3*in_near[i] + in_far[i];
+   out[i*2] = stbi__div16(3*t1 + t0 + 8);
+
+   for (++i; i < w; ++i) {
+      t0 = t1;
+      t1 = 3*in_near[i]+in_far[i];
+      out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
+      out[i*2  ] = stbi__div16(3*t1 + t0 + 8);
+   }
+   out[w*2-1] = stbi__div4(t1+2);
+
+   STBI_NOTUSED(hs);
+
+   return out;
+}
+#endif
+
+static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // resample with nearest-neighbor
+   int i,j;
+   STBI_NOTUSED(in_far);
+   for (i=0; i < w; ++i)
+      for (j=0; j < hs; ++j)
+         out[i*hs+j] = in_near[i];
+   return out;
+}
+
+// this is a reduced-precision calculation of YCbCr-to-RGB introduced
+// to make sure the code produces the same results in both SIMD and scalar
+#define stbi__float2fixed(x)  (((int) ((x) * 4096.0f + 0.5f)) << 8)
+static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step)
+{
+   int i;
+   for (i=0; i < count; ++i) {
+      int y_fixed = (y[i] << 20) + (1<<19); // rounding
+      int r,g,b;
+      int cr = pcr[i] - 128;
+      int cb = pcb[i] - 128;
+      r = y_fixed +  cr* stbi__float2fixed(1.40200f);
+      g = y_fixed + (cr*-stbi__float2fixed(0.71414f)) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000);
+      b = y_fixed                                     +   cb* stbi__float2fixed(1.77200f);
+      r >>= 20;
+      g >>= 20;
+      b >>= 20;
+      if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+      if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+      if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+      out[0] = (stbi_uc)r;
+      out[1] = (stbi_uc)g;
+      out[2] = (stbi_uc)b;
+      out[3] = 255;
+      out += step;
+   }
+}
+
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step)
+{
+   int i = 0;
+
+#ifdef STBI_SSE2
+   // step == 3 is pretty ugly on the final interleave, and i'm not convinced
+   // it's useful in practice (you wouldn't use it for textures, for example).
+   // so just accelerate step == 4 case.
+   if (step == 4) {
+      // this is a fairly straightforward implementation and not super-optimized.
+      __m128i signflip  = _mm_set1_epi8(-0x80);
+      __m128i cr_const0 = _mm_set1_epi16(   (short) ( 1.40200f*4096.0f+0.5f));
+      __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f));
+      __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f));
+      __m128i cb_const1 = _mm_set1_epi16(   (short) ( 1.77200f*4096.0f+0.5f));
+      __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128);
+      __m128i xw = _mm_set1_epi16(255); // alpha channel
+
+      for (; i+7 < count; i += 8) {
+         // load
+         __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i));
+         __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i));
+         __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i));
+         __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128
+         __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128
+
+         // unpack to short (and left-shift cr, cb by 8)
+         __m128i yw  = _mm_unpacklo_epi8(y_bias, y_bytes);
+         __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased);
+         __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased);
+
+         // color transform
+         __m128i yws = _mm_srli_epi16(yw, 4);
+         __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw);
+         __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw);
+         __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1);
+         __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1);
+         __m128i rws = _mm_add_epi16(cr0, yws);
+         __m128i gwt = _mm_add_epi16(cb0, yws);
+         __m128i bws = _mm_add_epi16(yws, cb1);
+         __m128i gws = _mm_add_epi16(gwt, cr1);
+
+         // descale
+         __m128i rw = _mm_srai_epi16(rws, 4);
+         __m128i bw = _mm_srai_epi16(bws, 4);
+         __m128i gw = _mm_srai_epi16(gws, 4);
+
+         // back to byte, set up for transpose
+         __m128i brb = _mm_packus_epi16(rw, bw);
+         __m128i gxb = _mm_packus_epi16(gw, xw);
+
+         // transpose to interleave channels
+         __m128i t0 = _mm_unpacklo_epi8(brb, gxb);
+         __m128i t1 = _mm_unpackhi_epi8(brb, gxb);
+         __m128i o0 = _mm_unpacklo_epi16(t0, t1);
+         __m128i o1 = _mm_unpackhi_epi16(t0, t1);
+
+         // store
+         _mm_storeu_si128((__m128i *) (out + 0), o0);
+         _mm_storeu_si128((__m128i *) (out + 16), o1);
+         out += 32;
+      }
+   }
+#endif
+
+#ifdef STBI_NEON
+   // in this version, step=3 support would be easy to add. but is there demand?
+   if (step == 4) {
+      // this is a fairly straightforward implementation and not super-optimized.
+      uint8x8_t signflip = vdup_n_u8(0x80);
+      int16x8_t cr_const0 = vdupq_n_s16(   (short) ( 1.40200f*4096.0f+0.5f));
+      int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f));
+      int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f));
+      int16x8_t cb_const1 = vdupq_n_s16(   (short) ( 1.77200f*4096.0f+0.5f));
+
+      for (; i+7 < count; i += 8) {
+         // load
+         uint8x8_t y_bytes  = vld1_u8(y + i);
+         uint8x8_t cr_bytes = vld1_u8(pcr + i);
+         uint8x8_t cb_bytes = vld1_u8(pcb + i);
+         int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip));
+         int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip));
+
+         // expand to s16
+         int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4));
+         int16x8_t crw = vshll_n_s8(cr_biased, 7);
+         int16x8_t cbw = vshll_n_s8(cb_biased, 7);
+
+         // color transform
+         int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0);
+         int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0);
+         int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1);
+         int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1);
+         int16x8_t rws = vaddq_s16(yws, cr0);
+         int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1);
+         int16x8_t bws = vaddq_s16(yws, cb1);
+
+         // undo scaling, round, convert to byte
+         uint8x8x4_t o;
+         o.val[0] = vqrshrun_n_s16(rws, 4);
+         o.val[1] = vqrshrun_n_s16(gws, 4);
+         o.val[2] = vqrshrun_n_s16(bws, 4);
+         o.val[3] = vdup_n_u8(255);
+
+         // store, interleaving r/g/b/a
+         vst4_u8(out, o);
+         out += 8*4;
+      }
+   }
+#endif
+
+   for (; i < count; ++i) {
+      int y_fixed = (y[i] << 20) + (1<<19); // rounding
+      int r,g,b;
+      int cr = pcr[i] - 128;
+      int cb = pcb[i] - 128;
+      r = y_fixed + cr* stbi__float2fixed(1.40200f);
+      g = y_fixed + cr*-stbi__float2fixed(0.71414f) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000);
+      b = y_fixed                                   +   cb* stbi__float2fixed(1.77200f);
+      r >>= 20;
+      g >>= 20;
+      b >>= 20;
+      if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+      if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+      if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+      out[0] = (stbi_uc)r;
+      out[1] = (stbi_uc)g;
+      out[2] = (stbi_uc)b;
+      out[3] = 255;
+      out += step;
+   }
+}
+#endif
+
+// set up the kernels
+static void stbi__setup_jpeg(stbi__jpeg *j)
+{
+   j->idct_block_kernel = stbi__idct_block;
+   j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row;
+   j->resample_row_hv_2_kernel = stbi__resample_row_hv_2;
+
+#ifdef STBI_SSE2
+   if (stbi__sse2_available()) {
+      j->idct_block_kernel = stbi__idct_simd;
+      j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+      j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+   }
+#endif
+
+#ifdef STBI_NEON
+   j->idct_block_kernel = stbi__idct_simd;
+   j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+   j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+#endif
+}
+
+// clean up the temporary component buffers
+static void stbi__cleanup_jpeg(stbi__jpeg *j)
+{
+   stbi__free_jpeg_components(j, j->s->img_n, 0);
+}
+
+typedef struct
+{
+   resample_row_func resample;
+   stbi_uc *line0,*line1;
+   int hs,vs;   // expansion factor in each axis
+   int w_lores; // horizontal pixels pre-expansion
+   int ystep;   // how far through vertical expansion we are
+   int ypos;    // which pre-expansion row we're on
+} stbi__resample;
+
+// fast 0..255 * 0..255 => 0..255 rounded multiplication
+static stbi_uc stbi__blinn_8x8(stbi_uc x, stbi_uc y)
+{
+   unsigned int t = x*y + 128;
+   return (stbi_uc) ((t + (t >>8)) >> 8);
+}
+
+static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp)
+{
+   int n, decode_n, is_rgb;
+   z->s->img_n = 0; // make stbi__cleanup_jpeg safe
+
+   // validate req_comp
+   if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+
+   // load a jpeg image from whichever source, but leave in YCbCr format
+   if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; }
+
+   // determine actual number of components to generate
+   n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1;
+
+   is_rgb = z->s->img_n == 3 && (z->rgb == 3 || (z->app14_color_transform == 0 && !z->jfif));
+
+   if (z->s->img_n == 3 && n < 3 && !is_rgb)
+      decode_n = 1;
+   else
+      decode_n = z->s->img_n;
+
+   // resample and color-convert
+   {
+      int k;
+      unsigned int i,j;
+      stbi_uc *output;
+      stbi_uc *coutput[4] = { NULL, NULL, NULL, NULL };
+
+      stbi__resample res_comp[4];
+
+      for (k=0; k < decode_n; ++k) {
+         stbi__resample *r = &res_comp[k];
+
+         // allocate line buffer big enough for upsampling off the edges
+         // with upsample factor of 4
+         z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3);
+         if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
+
+         r->hs      = z->img_h_max / z->img_comp[k].h;
+         r->vs      = z->img_v_max / z->img_comp[k].v;
+         r->ystep   = r->vs >> 1;
+         r->w_lores = (z->s->img_x + r->hs-1) / r->hs;
+         r->ypos    = 0;
+         r->line0   = r->line1 = z->img_comp[k].data;
+
+         if      (r->hs == 1 && r->vs == 1) r->resample = resample_row_1;
+         else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2;
+         else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2;
+         else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel;
+         else                               r->resample = stbi__resample_row_generic;
+      }
+
+      // can't error after this so, this is safe
+      output = (stbi_uc *) stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1);
+      if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
+
+      // now go ahead and resample
+      for (j=0; j < z->s->img_y; ++j) {
+         stbi_uc *out = output + n * z->s->img_x * j;
+         for (k=0; k < decode_n; ++k) {
+            stbi__resample *r = &res_comp[k];
+            int y_bot = r->ystep >= (r->vs >> 1);
+            coutput[k] = r->resample(z->img_comp[k].linebuf,
+                                     y_bot ? r->line1 : r->line0,
+                                     y_bot ? r->line0 : r->line1,
+                                     r->w_lores, r->hs);
+            if (++r->ystep >= r->vs) {
+               r->ystep = 0;
+               r->line0 = r->line1;
+               if (++r->ypos < z->img_comp[k].y)
+                  r->line1 += z->img_comp[k].w2;
+            }
+         }
+         if (n >= 3) {
+            stbi_uc *y = coutput[0];
+            if (z->s->img_n == 3) {
+               if (is_rgb) {
+                  for (i=0; i < z->s->img_x; ++i) {
+                     out[0] = y[i];
+                     out[1] = coutput[1][i];
+                     out[2] = coutput[2][i];
+                     out[3] = 255;
+                     out += n;
+                  }
+               } else {
+                  z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+               }
+            } else if (z->s->img_n == 4) {
+               if (z->app14_color_transform == 0) { // CMYK
+                  for (i=0; i < z->s->img_x; ++i) {
+                     stbi_uc m = coutput[3][i];
+                     out[0] = stbi__blinn_8x8(coutput[0][i], m);
+                     out[1] = stbi__blinn_8x8(coutput[1][i], m);
+                     out[2] = stbi__blinn_8x8(coutput[2][i], m);
+                     out[3] = 255;
+                     out += n;
+                  }
+               } else if (z->app14_color_transform == 2) { // YCCK
+                  z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+                  for (i=0; i < z->s->img_x; ++i) {
+                     stbi_uc m = coutput[3][i];
+                     out[0] = stbi__blinn_8x8(255 - out[0], m);
+                     out[1] = stbi__blinn_8x8(255 - out[1], m);
+                     out[2] = stbi__blinn_8x8(255 - out[2], m);
+                     out += n;
+                  }
+               } else { // YCbCr + alpha?  Ignore the fourth channel for now
+                  z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+               }
+            } else
+               for (i=0; i < z->s->img_x; ++i) {
+                  out[0] = out[1] = out[2] = y[i];
+                  out[3] = 255; // not used if n==3
+                  out += n;
+               }
+         } else {
+            if (is_rgb) {
+               if (n == 1)
+                  for (i=0; i < z->s->img_x; ++i)
+                     *out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
+               else {
+                  for (i=0; i < z->s->img_x; ++i, out += 2) {
+                     out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
+                     out[1] = 255;
+                  }
+               }
+            } else if (z->s->img_n == 4 && z->app14_color_transform == 0) {
+               for (i=0; i < z->s->img_x; ++i) {
+                  stbi_uc m = coutput[3][i];
+                  stbi_uc r = stbi__blinn_8x8(coutput[0][i], m);
+                  stbi_uc g = stbi__blinn_8x8(coutput[1][i], m);
+                  stbi_uc b = stbi__blinn_8x8(coutput[2][i], m);
+                  out[0] = stbi__compute_y(r, g, b);
+                  out[1] = 255;
+                  out += n;
+               }
+            } else if (z->s->img_n == 4 && z->app14_color_transform == 2) {
+               for (i=0; i < z->s->img_x; ++i) {
+                  out[0] = stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]);
+                  out[1] = 255;
+                  out += n;
+               }
+            } else {
+               stbi_uc *y = coutput[0];
+               if (n == 1)
+                  for (i=0; i < z->s->img_x; ++i) out[i] = y[i];
+               else
+                  for (i=0; i < z->s->img_x; ++i) { *out++ = y[i]; *out++ = 255; }
+            }
+         }
+      }
+      stbi__cleanup_jpeg(z);
+      *out_x = z->s->img_x;
+      *out_y = z->s->img_y;
+      if (comp) *comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output
+      return output;
+   }
+}
+
+static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   unsigned char* result;
+   stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg));
+   STBI_NOTUSED(ri);
+   j->s = s;
+   stbi__setup_jpeg(j);
+   result = load_jpeg_image(j, x,y,comp,req_comp);
+   STBI_FREE(j);
+   return result;
+}
+
+static int stbi__jpeg_test(stbi__context *s)
+{
+   int r;
+   stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg));
+   j->s = s;
+   stbi__setup_jpeg(j);
+   r = stbi__decode_jpeg_header(j, STBI__SCAN_type);
+   stbi__rewind(s);
+   STBI_FREE(j);
+   return r;
+}
+
+static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp)
+{
+   if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) {
+      stbi__rewind( j->s );
+      return 0;
+   }
+   if (x) *x = j->s->img_x;
+   if (y) *y = j->s->img_y;
+   if (comp) *comp = j->s->img_n >= 3 ? 3 : 1;
+   return 1;
+}
+
+static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   int result;
+   stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg)));
+   j->s = s;
+   result = stbi__jpeg_info_raw(j, x, y, comp);
+   STBI_FREE(j);
+   return result;
+}
+#endif
+
+// public domain zlib decode    v0.2  Sean Barrett 2006-11-18
+//    simple implementation
+//      - all input must be provided in an upfront buffer
+//      - all output is written to a single output buffer (can malloc/realloc)
+//    performance
+//      - fast huffman
+
+#ifndef STBI_NO_ZLIB
+
+// fast-way is faster to check than jpeg huffman, but slow way is slower
+#define STBI__ZFAST_BITS  9 // accelerate all cases in default tables
+#define STBI__ZFAST_MASK  ((1 << STBI__ZFAST_BITS) - 1)
+
+// zlib-style huffman encoding
+// (jpegs packs from left, zlib from right, so can't share code)
+typedef struct
+{
+   stbi__uint16 fast[1 << STBI__ZFAST_BITS];
+   stbi__uint16 firstcode[16];
+   int maxcode[17];
+   stbi__uint16 firstsymbol[16];
+   stbi_uc  size[288];
+   stbi__uint16 value[288];
+} stbi__zhuffman;
+
+stbi_inline static int stbi__bitreverse16(int n)
+{
+  n = ((n & 0xAAAA) >>  1) | ((n & 0x5555) << 1);
+  n = ((n & 0xCCCC) >>  2) | ((n & 0x3333) << 2);
+  n = ((n & 0xF0F0) >>  4) | ((n & 0x0F0F) << 4);
+  n = ((n & 0xFF00) >>  8) | ((n & 0x00FF) << 8);
+  return n;
+}
+
+stbi_inline static int stbi__bit_reverse(int v, int bits)
+{
+   STBI_ASSERT(bits <= 16);
+   // to bit reverse n bits, reverse 16 and shift
+   // e.g. 11 bits, bit reverse and shift away 5
+   return stbi__bitreverse16(v) >> (16-bits);
+}
+
+static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist, int num)
+{
+   int i,k=0;
+   int code, next_code[16], sizes[17];
+
+   // DEFLATE spec for generating codes
+   memset(sizes, 0, sizeof(sizes));
+   memset(z->fast, 0, sizeof(z->fast));
+   for (i=0; i < num; ++i)
+      ++sizes[sizelist[i]];
+   sizes[0] = 0;
+   for (i=1; i < 16; ++i)
+      if (sizes[i] > (1 << i))
+         return stbi__err("bad sizes", "Corrupt PNG");
+   code = 0;
+   for (i=1; i < 16; ++i) {
+      next_code[i] = code;
+      z->firstcode[i] = (stbi__uint16) code;
+      z->firstsymbol[i] = (stbi__uint16) k;
+      code = (code + sizes[i]);
+      if (sizes[i])
+         if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG");
+      z->maxcode[i] = code << (16-i); // preshift for inner loop
+      code <<= 1;
+      k += sizes[i];
+   }
+   z->maxcode[16] = 0x10000; // sentinel
+   for (i=0; i < num; ++i) {
+      int s = sizelist[i];
+      if (s) {
+         int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
+         stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i);
+         z->size [c] = (stbi_uc     ) s;
+         z->value[c] = (stbi__uint16) i;
+         if (s <= STBI__ZFAST_BITS) {
+            int j = stbi__bit_reverse(next_code[s],s);
+            while (j < (1 << STBI__ZFAST_BITS)) {
+               z->fast[j] = fastv;
+               j += (1 << s);
+            }
+         }
+         ++next_code[s];
+      }
+   }
+   return 1;
+}
+
+// zlib-from-memory implementation for PNG reading
+//    because PNG allows splitting the zlib stream arbitrarily,
+//    and it's annoying structurally to have PNG call ZLIB call PNG,
+//    we require PNG read all the IDATs and combine them into a single
+//    memory buffer
+
+typedef struct
+{
+   stbi_uc *zbuffer, *zbuffer_end;
+   int num_bits;
+   stbi__uint32 code_buffer;
+
+   char *zout;
+   char *zout_start;
+   char *zout_end;
+   int   z_expandable;
+
+   stbi__zhuffman z_length, z_distance;
+} stbi__zbuf;
+
+stbi_inline static int stbi__zeof(stbi__zbuf *z)
+{
+   return (z->zbuffer >= z->zbuffer_end);
+}
+
+stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z)
+{
+   return stbi__zeof(z) ? 0 : *z->zbuffer++;
+}
+
+static void stbi__fill_bits(stbi__zbuf *z)
+{
+   do {
+      if (z->code_buffer >= (1U << z->num_bits)) {
+        z->zbuffer = z->zbuffer_end;  /* treat this as EOF so we fail. */
+        return;
+      }
+      z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits;
+      z->num_bits += 8;
+   } while (z->num_bits <= 24);
+}
+
+stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n)
+{
+   unsigned int k;
+   if (z->num_bits < n) stbi__fill_bits(z);
+   k = z->code_buffer & ((1 << n) - 1);
+   z->code_buffer >>= n;
+   z->num_bits -= n;
+   return k;
+}
+
+static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z)
+{
+   int b,s,k;
+   // not resolved by fast table, so compute it the slow way
+   // use jpeg approach, which requires MSbits at top
+   k = stbi__bit_reverse(a->code_buffer, 16);
+   for (s=STBI__ZFAST_BITS+1; ; ++s)
+      if (k < z->maxcode[s])
+         break;
+   if (s >= 16) return -1; // invalid code!
+   // code size is s, so:
+   b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s];
+   if (b >= (int) sizeof (z->size)) return -1; // some data was corrupt somewhere!
+   if (z->size[b] != s) return -1;  // was originally an assert, but report failure instead.
+   a->code_buffer >>= s;
+   a->num_bits -= s;
+   return z->value[b];
+}
+
+stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z)
+{
+   int b,s;
+   if (a->num_bits < 16) {
+      if (stbi__zeof(a)) {
+         return -1;   /* report error for unexpected end of data. */
+      }
+      stbi__fill_bits(a);
+   }
+   b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
+   if (b) {
+      s = b >> 9;
+      a->code_buffer >>= s;
+      a->num_bits -= s;
+      return b & 511;
+   }
+   return stbi__zhuffman_decode_slowpath(a, z);
+}
+
+static int stbi__zexpand(stbi__zbuf *z, char *zout, int n)  // need to make room for n bytes
+{
+   char *q;
+   unsigned int cur, limit, old_limit;
+   z->zout = zout;
+   if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG");
+   cur   = (unsigned int) (z->zout - z->zout_start);
+   limit = old_limit = (unsigned) (z->zout_end - z->zout_start);
+   if (UINT_MAX - cur < (unsigned) n) return stbi__err("outofmem", "Out of memory");
+   while (cur + n > limit) {
+      if(limit > UINT_MAX / 2) return stbi__err("outofmem", "Out of memory");
+      limit *= 2;
+   }
+   q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit);
+   STBI_NOTUSED(old_limit);
+   if (q == NULL) return stbi__err("outofmem", "Out of memory");
+   z->zout_start = q;
+   z->zout       = q + cur;
+   z->zout_end   = q + limit;
+   return 1;
+}
+
+static const int stbi__zlength_base[31] = {
+   3,4,5,6,7,8,9,10,11,13,
+   15,17,19,23,27,31,35,43,51,59,
+   67,83,99,115,131,163,195,227,258,0,0 };
+
+static const int stbi__zlength_extra[31]=
+{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };
+
+static const int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,
+257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};
+
+static const int stbi__zdist_extra[32] =
+{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
+
+static int stbi__parse_huffman_block(stbi__zbuf *a)
+{
+   char *zout = a->zout;
+   for(;;) {
+      int z = stbi__zhuffman_decode(a, &a->z_length);
+      if (z < 256) {
+         if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes
+         if (zout >= a->zout_end) {
+            if (!stbi__zexpand(a, zout, 1)) return 0;
+            zout = a->zout;
+         }
+         *zout++ = (char) z;
+      } else {
+         stbi_uc *p;
+         int len,dist;
+         if (z == 256) {
+            a->zout = zout;
+            return 1;
+         }
+         z -= 257;
+         len = stbi__zlength_base[z];
+         if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]);
+         z = stbi__zhuffman_decode(a, &a->z_distance);
+         if (z < 0) return stbi__err("bad huffman code","Corrupt PNG");
+         dist = stbi__zdist_base[z];
+         if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]);
+         if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG");
+         if (zout + len > a->zout_end) {
+            if (!stbi__zexpand(a, zout, len)) return 0;
+            zout = a->zout;
+         }
+         p = (stbi_uc *) (zout - dist);
+         if (dist == 1) { // run of one byte; common in images.
+            stbi_uc v = *p;
+            if (len) { do *zout++ = v; while (--len); }
+         } else {
+            if (len) { do *zout++ = *p++; while (--len); }
+         }
+      }
+   }
+}
+
+static int stbi__compute_huffman_codes(stbi__zbuf *a)
+{
+   static const stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
+   stbi__zhuffman z_codelength;
+   stbi_uc lencodes[286+32+137];//padding for maximum single op
+   stbi_uc codelength_sizes[19];
+   int i,n;
+
+   int hlit  = stbi__zreceive(a,5) + 257;
+   int hdist = stbi__zreceive(a,5) + 1;
+   int hclen = stbi__zreceive(a,4) + 4;
+   int ntot  = hlit + hdist;
+
+   memset(codelength_sizes, 0, sizeof(codelength_sizes));
+   for (i=0; i < hclen; ++i) {
+      int s = stbi__zreceive(a,3);
+      codelength_sizes[length_dezigzag[i]] = (stbi_uc) s;
+   }
+   if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;
+
+   n = 0;
+   while (n < ntot) {
+      int c = stbi__zhuffman_decode(a, &z_codelength);
+      if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG");
+      if (c < 16)
+         lencodes[n++] = (stbi_uc) c;
+      else {
+         stbi_uc fill = 0;
+         if (c == 16) {
+            c = stbi__zreceive(a,2)+3;
+            if (n == 0) return stbi__err("bad codelengths", "Corrupt PNG");
+            fill = lencodes[n-1];
+         } else if (c == 17) {
+            c = stbi__zreceive(a,3)+3;
+         } else if (c == 18) {
+            c = stbi__zreceive(a,7)+11;
+         } else {
+            return stbi__err("bad codelengths", "Corrupt PNG");
+         }
+         if (ntot - n < c) return stbi__err("bad codelengths", "Corrupt PNG");
+         memset(lencodes+n, fill, c);
+         n += c;
+      }
+   }
+   if (n != ntot) return stbi__err("bad codelengths","Corrupt PNG");
+   if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
+   if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0;
+   return 1;
+}
+
+static int stbi__parse_uncompressed_block(stbi__zbuf *a)
+{
+   stbi_uc header[4];
+   int len,nlen,k;
+   if (a->num_bits & 7)
+      stbi__zreceive(a, a->num_bits & 7); // discard
+   // drain the bit-packed data into header
+   k = 0;
+   while (a->num_bits > 0) {
+      header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check
+      a->code_buffer >>= 8;
+      a->num_bits -= 8;
+   }
+   if (a->num_bits < 0) return stbi__err("zlib corrupt","Corrupt PNG");
+   // now fill header the normal way
+   while (k < 4)
+      header[k++] = stbi__zget8(a);
+   len  = header[1] * 256 + header[0];
+   nlen = header[3] * 256 + header[2];
+   if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG");
+   if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG");
+   if (a->zout + len > a->zout_end)
+      if (!stbi__zexpand(a, a->zout, len)) return 0;
+   memcpy(a->zout, a->zbuffer, len);
+   a->zbuffer += len;
+   a->zout += len;
+   return 1;
+}
+
+static int stbi__parse_zlib_header(stbi__zbuf *a)
+{
+   int cmf   = stbi__zget8(a);
+   int cm    = cmf & 15;
+   /* int cinfo = cmf >> 4; */
+   int flg   = stbi__zget8(a);
+   if (stbi__zeof(a)) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec
+   if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec
+   if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png
+   if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png
+   // window = 1 << (8 + cinfo)... but who cares, we fully buffer output
+   return 1;
+}
+
+static const stbi_uc stbi__zdefault_length[288] =
+{
+   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
+   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
+   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
+   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
+   8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
+   9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
+   9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
+   9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
+   7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8
+};
+static const stbi_uc stbi__zdefault_distance[32] =
+{
+   5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5
+};
+/*
+Init algorithm:
+{
+   int i;   // use <= to match clearly with spec
+   for (i=0; i <= 143; ++i)     stbi__zdefault_length[i]   = 8;
+   for (   ; i <= 255; ++i)     stbi__zdefault_length[i]   = 9;
+   for (   ; i <= 279; ++i)     stbi__zdefault_length[i]   = 7;
+   for (   ; i <= 287; ++i)     stbi__zdefault_length[i]   = 8;
+
+   for (i=0; i <=  31; ++i)     stbi__zdefault_distance[i] = 5;
+}
+*/
+
+static int stbi__parse_zlib(stbi__zbuf *a, int parse_header)
+{
+   int final, type;
+   if (parse_header)
+      if (!stbi__parse_zlib_header(a)) return 0;
+   a->num_bits = 0;
+   a->code_buffer = 0;
+   do {
+      final = stbi__zreceive(a,1);
+      type = stbi__zreceive(a,2);
+      if (type == 0) {
+         if (!stbi__parse_uncompressed_block(a)) return 0;
+      } else if (type == 3) {
+         return 0;
+      } else {
+         if (type == 1) {
+            // use fixed code lengths
+            if (!stbi__zbuild_huffman(&a->z_length  , stbi__zdefault_length  , 288)) return 0;
+            if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance,  32)) return 0;
+         } else {
+            if (!stbi__compute_huffman_codes(a)) return 0;
+         }
+         if (!stbi__parse_huffman_block(a)) return 0;
+      }
+   } while (!final);
+   return 1;
+}
+
+static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header)
+{
+   a->zout_start = obuf;
+   a->zout       = obuf;
+   a->zout_end   = obuf + olen;
+   a->z_expandable = exp;
+
+   return stbi__parse_zlib(a, parse_header);
+}
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen)
+{
+   stbi__zbuf a;
+   char *p = (char *) stbi__malloc(initial_size);
+   if (p == NULL) return NULL;
+   a.zbuffer = (stbi_uc *) buffer;
+   a.zbuffer_end = (stbi_uc *) buffer + len;
+   if (stbi__do_zlib(&a, p, initial_size, 1, 1)) {
+      if (outlen) *outlen = (int) (a.zout - a.zout_start);
+      return a.zout_start;
+   } else {
+      STBI_FREE(a.zout_start);
+      return NULL;
+   }
+}
+
+STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
+{
+   return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
+}
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header)
+{
+   stbi__zbuf a;
+   char *p = (char *) stbi__malloc(initial_size);
+   if (p == NULL) return NULL;
+   a.zbuffer = (stbi_uc *) buffer;
+   a.zbuffer_end = (stbi_uc *) buffer + len;
+   if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) {
+      if (outlen) *outlen = (int) (a.zout - a.zout_start);
+      return a.zout_start;
+   } else {
+      STBI_FREE(a.zout_start);
+      return NULL;
+   }
+}
+
+STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
+{
+   stbi__zbuf a;
+   a.zbuffer = (stbi_uc *) ibuffer;
+   a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
+   if (stbi__do_zlib(&a, obuffer, olen, 0, 1))
+      return (int) (a.zout - a.zout_start);
+   else
+      return -1;
+}
+
+STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
+{
+   stbi__zbuf a;
+   char *p = (char *) stbi__malloc(16384);
+   if (p == NULL) return NULL;
+   a.zbuffer = (stbi_uc *) buffer;
+   a.zbuffer_end = (stbi_uc *) buffer+len;
+   if (stbi__do_zlib(&a, p, 16384, 1, 0)) {
+      if (outlen) *outlen = (int) (a.zout - a.zout_start);
+      return a.zout_start;
+   } else {
+      STBI_FREE(a.zout_start);
+      return NULL;
+   }
+}
+
+STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
+{
+   stbi__zbuf a;
+   a.zbuffer = (stbi_uc *) ibuffer;
+   a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
+   if (stbi__do_zlib(&a, obuffer, olen, 0, 0))
+      return (int) (a.zout - a.zout_start);
+   else
+      return -1;
+}
+#endif
+
+// public domain "baseline" PNG decoder   v0.10  Sean Barrett 2006-11-18
+//    simple implementation
+//      - only 8-bit samples
+//      - no CRC checking
+//      - allocates lots of intermediate memory
+//        - avoids problem of streaming data between subsystems
+//        - avoids explicit window management
+//    performance
+//      - uses stb_zlib, a PD zlib implementation with fast huffman decoding
+
+#ifndef STBI_NO_PNG
+typedef struct
+{
+   stbi__uint32 length;
+   stbi__uint32 type;
+} stbi__pngchunk;
+
+static stbi__pngchunk stbi__get_chunk_header(stbi__context *s)
+{
+   stbi__pngchunk c;
+   c.length = stbi__get32be(s);
+   c.type   = stbi__get32be(s);
+   return c;
+}
+
+static int stbi__check_png_header(stbi__context *s)
+{
+   static const stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 };
+   int i;
+   for (i=0; i < 8; ++i)
+      if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG");
+   return 1;
+}
+
+typedef struct
+{
+   stbi__context *s;
+   stbi_uc *idata, *expanded, *out;
+   int depth;
+} stbi__png;
+
+
+enum {
+   STBI__F_none=0,
+   STBI__F_sub=1,
+   STBI__F_up=2,
+   STBI__F_avg=3,
+   STBI__F_paeth=4,
+   // synthetic filters used for first scanline to avoid needing a dummy row of 0s
+   STBI__F_avg_first,
+   STBI__F_paeth_first
+};
+
+static stbi_uc first_row_filter[5] =
+{
+   STBI__F_none,
+   STBI__F_sub,
+   STBI__F_none,
+   STBI__F_avg_first,
+   STBI__F_paeth_first
+};
+
+static int stbi__paeth(int a, int b, int c)
+{
+   int p = a + b - c;
+   int pa = abs(p-a);
+   int pb = abs(p-b);
+   int pc = abs(p-c);
+   if (pa <= pb && pa <= pc) return a;
+   if (pb <= pc) return b;
+   return c;
+}
+
+static const stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 };
+
+// create the png data from post-deflated data
+static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color)
+{
+   int bytes = (depth == 16? 2 : 1);
+   stbi__context *s = a->s;
+   stbi__uint32 i,j,stride = x*out_n*bytes;
+   stbi__uint32 img_len, img_width_bytes;
+   int k;
+   int img_n = s->img_n; // copy it into a local for later
+
+   int output_bytes = out_n*bytes;
+   int filter_bytes = img_n*bytes;
+   int width = x;
+
+   STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1);
+   a->out = (stbi_uc *) stbi__malloc_mad3(x, y, output_bytes, 0); // extra bytes to write off the end into
+   if (!a->out) return stbi__err("outofmem", "Out of memory");
+
+   if (!stbi__mad3sizes_valid(img_n, x, depth, 7)) return stbi__err("too large", "Corrupt PNG");
+   img_width_bytes = (((img_n * x * depth) + 7) >> 3);
+   img_len = (img_width_bytes + 1) * y;
+
+   // we used to check for exact match between raw_len and img_len on non-interlaced PNGs,
+   // but issue #276 reported a PNG in the wild that had extra data at the end (all zeros),
+   // so just check for raw_len < img_len always.
+   if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG");
+
+   for (j=0; j < y; ++j) {
+      stbi_uc *cur = a->out + stride*j;
+      stbi_uc *prior;
+      int filter = *raw++;
+
+      if (filter > 4)
+         return stbi__err("invalid filter","Corrupt PNG");
+
+      if (depth < 8) {
+         if (img_width_bytes > x) return stbi__err("invalid width","Corrupt PNG");
+         cur += x*out_n - img_width_bytes; // store output to the rightmost img_len bytes, so we can decode in place
+         filter_bytes = 1;
+         width = img_width_bytes;
+      }
+      prior = cur - stride; // bugfix: need to compute this after 'cur +=' computation above
+
+      // if first row, use special filter that doesn't sample previous row
+      if (j == 0) filter = first_row_filter[filter];
+
+      // handle first byte explicitly
+      for (k=0; k < filter_bytes; ++k) {
+         switch (filter) {
+            case STBI__F_none       : cur[k] = raw[k]; break;
+            case STBI__F_sub        : cur[k] = raw[k]; break;
+            case STBI__F_up         : cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break;
+            case STBI__F_avg        : cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); break;
+            case STBI__F_paeth      : cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0,prior[k],0)); break;
+            case STBI__F_avg_first  : cur[k] = raw[k]; break;
+            case STBI__F_paeth_first: cur[k] = raw[k]; break;
+         }
+      }
+
+      if (depth == 8) {
+         if (img_n != out_n)
+            cur[img_n] = 255; // first pixel
+         raw += img_n;
+         cur += out_n;
+         prior += out_n;
+      } else if (depth == 16) {
+         if (img_n != out_n) {
+            cur[filter_bytes]   = 255; // first pixel top byte
+            cur[filter_bytes+1] = 255; // first pixel bottom byte
+         }
+         raw += filter_bytes;
+         cur += output_bytes;
+         prior += output_bytes;
+      } else {
+         raw += 1;
+         cur += 1;
+         prior += 1;
+      }
+
+      // this is a little gross, so that we don't switch per-pixel or per-component
+      if (depth < 8 || img_n == out_n) {
+         int nk = (width - 1)*filter_bytes;
+         #define STBI__CASE(f) \
+             case f:     \
+                for (k=0; k < nk; ++k)
+         switch (filter) {
+            // "none" filter turns into a memcpy here; make that explicit.
+            case STBI__F_none:         memcpy(cur, raw, nk); break;
+            STBI__CASE(STBI__F_sub)          { cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); } break;
+            STBI__CASE(STBI__F_up)           { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break;
+            STBI__CASE(STBI__F_avg)          { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1)); } break;
+            STBI__CASE(STBI__F_paeth)        { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],prior[k],prior[k-filter_bytes])); } break;
+            STBI__CASE(STBI__F_avg_first)    { cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); } break;
+            STBI__CASE(STBI__F_paeth_first)  { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],0,0)); } break;
+         }
+         #undef STBI__CASE
+         raw += nk;
+      } else {
+         STBI_ASSERT(img_n+1 == out_n);
+         #define STBI__CASE(f) \
+             case f:     \
+                for (i=x-1; i >= 1; --i, cur[filter_bytes]=255,raw+=filter_bytes,cur+=output_bytes,prior+=output_bytes) \
+                   for (k=0; k < filter_bytes; ++k)
+         switch (filter) {
+            STBI__CASE(STBI__F_none)         { cur[k] = raw[k]; } break;
+            STBI__CASE(STBI__F_sub)          { cur[k] = STBI__BYTECAST(raw[k] + cur[k- output_bytes]); } break;
+            STBI__CASE(STBI__F_up)           { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break;
+            STBI__CASE(STBI__F_avg)          { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k- output_bytes])>>1)); } break;
+            STBI__CASE(STBI__F_paeth)        { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k- output_bytes],prior[k],prior[k- output_bytes])); } break;
+            STBI__CASE(STBI__F_avg_first)    { cur[k] = STBI__BYTECAST(raw[k] + (cur[k- output_bytes] >> 1)); } break;
+            STBI__CASE(STBI__F_paeth_first)  { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k- output_bytes],0,0)); } break;
+         }
+         #undef STBI__CASE
+
+         // the loop above sets the high byte of the pixels' alpha, but for
+         // 16 bit png files we also need the low byte set. we'll do that here.
+         if (depth == 16) {
+            cur = a->out + stride*j; // start at the beginning of the row again
+            for (i=0; i < x; ++i,cur+=output_bytes) {
+               cur[filter_bytes+1] = 255;
+            }
+         }
+      }
+   }
+
+   // we make a separate pass to expand bits to pixels; for performance,
+   // this could run two scanlines behind the above code, so it won't
+   // intefere with filtering but will still be in the cache.
+   if (depth < 8) {
+      for (j=0; j < y; ++j) {
+         stbi_uc *cur = a->out + stride*j;
+         stbi_uc *in  = a->out + stride*j + x*out_n - img_width_bytes;
+         // unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the common 8-bit path optimal at minimal cost for 1/2/4-bit
+         // png guarante byte alignment, if width is not multiple of 8/4/2 we'll decode dummy trailing data that will be skipped in the later loop
+         stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range
+
+         // note that the final byte might overshoot and write more data than desired.
+         // we can allocate enough data that this never writes out of memory, but it
+         // could also overwrite the next scanline. can it overwrite non-empty data
+         // on the next scanline? yes, consider 1-pixel-wide scanlines with 1-bit-per-pixel.
+         // so we need to explicitly clamp the final ones
+
+         if (depth == 4) {
+            for (k=x*img_n; k >= 2; k-=2, ++in) {
+               *cur++ = scale * ((*in >> 4)       );
+               *cur++ = scale * ((*in     ) & 0x0f);
+            }
+            if (k > 0) *cur++ = scale * ((*in >> 4)       );
+         } else if (depth == 2) {
+            for (k=x*img_n; k >= 4; k-=4, ++in) {
+               *cur++ = scale * ((*in >> 6)       );
+               *cur++ = scale * ((*in >> 4) & 0x03);
+               *cur++ = scale * ((*in >> 2) & 0x03);
+               *cur++ = scale * ((*in     ) & 0x03);
+            }
+            if (k > 0) *cur++ = scale * ((*in >> 6)       );
+            if (k > 1) *cur++ = scale * ((*in >> 4) & 0x03);
+            if (k > 2) *cur++ = scale * ((*in >> 2) & 0x03);
+         } else if (depth == 1) {
+            for (k=x*img_n; k >= 8; k-=8, ++in) {
+               *cur++ = scale * ((*in >> 7)       );
+               *cur++ = scale * ((*in >> 6) & 0x01);
+               *cur++ = scale * ((*in >> 5) & 0x01);
+               *cur++ = scale * ((*in >> 4) & 0x01);
+               *cur++ = scale * ((*in >> 3) & 0x01);
+               *cur++ = scale * ((*in >> 2) & 0x01);
+               *cur++ = scale * ((*in >> 1) & 0x01);
+               *cur++ = scale * ((*in     ) & 0x01);
+            }
+            if (k > 0) *cur++ = scale * ((*in >> 7)       );
+            if (k > 1) *cur++ = scale * ((*in >> 6) & 0x01);
+            if (k > 2) *cur++ = scale * ((*in >> 5) & 0x01);
+            if (k > 3) *cur++ = scale * ((*in >> 4) & 0x01);
+            if (k > 4) *cur++ = scale * ((*in >> 3) & 0x01);
+            if (k > 5) *cur++ = scale * ((*in >> 2) & 0x01);
+            if (k > 6) *cur++ = scale * ((*in >> 1) & 0x01);
+         }
+         if (img_n != out_n) {
+            int q;
+            // insert alpha = 255
+            cur = a->out + stride*j;
+            if (img_n == 1) {
+               for (q=x-1; q >= 0; --q) {
+                  cur[q*2+1] = 255;
+                  cur[q*2+0] = cur[q];
+               }
+            } else {
+               STBI_ASSERT(img_n == 3);
+               for (q=x-1; q >= 0; --q) {
+                  cur[q*4+3] = 255;
+                  cur[q*4+2] = cur[q*3+2];
+                  cur[q*4+1] = cur[q*3+1];
+                  cur[q*4+0] = cur[q*3+0];
+               }
+            }
+         }
+      }
+   } else if (depth == 16) {
+      // force the image data from big-endian to platform-native.
+      // this is done in a separate pass due to the decoding relying
+      // on the data being untouched, but could probably be done
+      // per-line during decode if care is taken.
+      stbi_uc *cur = a->out;
+      stbi__uint16 *cur16 = (stbi__uint16*)cur;
+
+      for(i=0; i < x*y*out_n; ++i,cur16++,cur+=2) {
+         *cur16 = (cur[0] << 8) | cur[1];
+      }
+   }
+
+   return 1;
+}
+
+static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced)
+{
+   int bytes = (depth == 16 ? 2 : 1);
+   int out_bytes = out_n * bytes;
+   stbi_uc *final;
+   int p;
+   if (!interlaced)
+      return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color);
+
+   // de-interlacing
+   final = (stbi_uc *) stbi__malloc_mad3(a->s->img_x, a->s->img_y, out_bytes, 0);
+   for (p=0; p < 7; ++p) {
+      int xorig[] = { 0,4,0,2,0,1,0 };
+      int yorig[] = { 0,0,4,0,2,0,1 };
+      int xspc[]  = { 8,8,4,4,2,2,1 };
+      int yspc[]  = { 8,8,8,4,4,2,2 };
+      int i,j,x,y;
+      // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1
+      x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p];
+      y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p];
+      if (x && y) {
+         stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y;
+         if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) {
+            STBI_FREE(final);
+            return 0;
+         }
+         for (j=0; j < y; ++j) {
+            for (i=0; i < x; ++i) {
+               int out_y = j*yspc[p]+yorig[p];
+               int out_x = i*xspc[p]+xorig[p];
+               memcpy(final + out_y*a->s->img_x*out_bytes + out_x*out_bytes,
+                      a->out + (j*x+i)*out_bytes, out_bytes);
+            }
+         }
+         STBI_FREE(a->out);
+         image_data += img_len;
+         image_data_len -= img_len;
+      }
+   }
+   a->out = final;
+
+   return 1;
+}
+
+static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n)
+{
+   stbi__context *s = z->s;
+   stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+   stbi_uc *p = z->out;
+
+   // compute color-based transparency, assuming we've
+   // already got 255 as the alpha value in the output
+   STBI_ASSERT(out_n == 2 || out_n == 4);
+
+   if (out_n == 2) {
+      for (i=0; i < pixel_count; ++i) {
+         p[1] = (p[0] == tc[0] ? 0 : 255);
+         p += 2;
+      }
+   } else {
+      for (i=0; i < pixel_count; ++i) {
+         if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
+            p[3] = 0;
+         p += 4;
+      }
+   }
+   return 1;
+}
+
+static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int out_n)
+{
+   stbi__context *s = z->s;
+   stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+   stbi__uint16 *p = (stbi__uint16*) z->out;
+
+   // compute color-based transparency, assuming we've
+   // already got 65535 as the alpha value in the output
+   STBI_ASSERT(out_n == 2 || out_n == 4);
+
+   if (out_n == 2) {
+      for (i = 0; i < pixel_count; ++i) {
+         p[1] = (p[0] == tc[0] ? 0 : 65535);
+         p += 2;
+      }
+   } else {
+      for (i = 0; i < pixel_count; ++i) {
+         if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
+            p[3] = 0;
+         p += 4;
+      }
+   }
+   return 1;
+}
+
+static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n)
+{
+   stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y;
+   stbi_uc *p, *temp_out, *orig = a->out;
+
+   p = (stbi_uc *) stbi__malloc_mad2(pixel_count, pal_img_n, 0);
+   if (p == NULL) return stbi__err("outofmem", "Out of memory");
+
+   // between here and free(out) below, exitting would leak
+   temp_out = p;
+
+   if (pal_img_n == 3) {
+      for (i=0; i < pixel_count; ++i) {
+         int n = orig[i]*4;
+         p[0] = palette[n  ];
+         p[1] = palette[n+1];
+         p[2] = palette[n+2];
+         p += 3;
+      }
+   } else {
+      for (i=0; i < pixel_count; ++i) {
+         int n = orig[i]*4;
+         p[0] = palette[n  ];
+         p[1] = palette[n+1];
+         p[2] = palette[n+2];
+         p[3] = palette[n+3];
+         p += 4;
+      }
+   }
+   STBI_FREE(a->out);
+   a->out = temp_out;
+
+   STBI_NOTUSED(len);
+
+   return 1;
+}
+
+static int stbi__unpremultiply_on_load = 0;
+static int stbi__de_iphone_flag = 0;
+
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply)
+{
+   stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply;
+}
+
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert)
+{
+   stbi__de_iphone_flag = flag_true_if_should_convert;
+}
+
+static void stbi__de_iphone(stbi__png *z)
+{
+   stbi__context *s = z->s;
+   stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+   stbi_uc *p = z->out;
+
+   if (s->img_out_n == 3) {  // convert bgr to rgb
+      for (i=0; i < pixel_count; ++i) {
+         stbi_uc t = p[0];
+         p[0] = p[2];
+         p[2] = t;
+         p += 3;
+      }
+   } else {
+      STBI_ASSERT(s->img_out_n == 4);
+      if (stbi__unpremultiply_on_load) {
+         // convert bgr to rgb and unpremultiply
+         for (i=0; i < pixel_count; ++i) {
+            stbi_uc a = p[3];
+            stbi_uc t = p[0];
+            if (a) {
+               stbi_uc half = a / 2;
+               p[0] = (p[2] * 255 + half) / a;
+               p[1] = (p[1] * 255 + half) / a;
+               p[2] = ( t   * 255 + half) / a;
+            } else {
+               p[0] = p[2];
+               p[2] = t;
+            }
+            p += 4;
+         }
+      } else {
+         // convert bgr to rgb
+         for (i=0; i < pixel_count; ++i) {
+            stbi_uc t = p[0];
+            p[0] = p[2];
+            p[2] = t;
+            p += 4;
+         }
+      }
+   }
+}
+
+#define STBI__PNG_TYPE(a,b,c,d)  (((unsigned) (a) << 24) + ((unsigned) (b) << 16) + ((unsigned) (c) << 8) + (unsigned) (d))
+
+static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
+{
+   stbi_uc palette[1024], pal_img_n=0;
+   stbi_uc has_trans=0, tc[3]={0};
+   stbi__uint16 tc16[3];
+   stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0;
+   int first=1,k,interlace=0, color=0, is_iphone=0;
+   stbi__context *s = z->s;
+
+   z->expanded = NULL;
+   z->idata = NULL;
+   z->out = NULL;
+
+   if (!stbi__check_png_header(s)) return 0;
+
+   if (scan == STBI__SCAN_type) return 1;
+
+   for (;;) {
+      stbi__pngchunk c = stbi__get_chunk_header(s);
+      switch (c.type) {
+         case STBI__PNG_TYPE('C','g','B','I'):
+            is_iphone = 1;
+            stbi__skip(s, c.length);
+            break;
+         case STBI__PNG_TYPE('I','H','D','R'): {
+            int comp,filter;
+            if (!first) return stbi__err("multiple IHDR","Corrupt PNG");
+            first = 0;
+            if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG");
+            s->img_x = stbi__get32be(s);
+            s->img_y = stbi__get32be(s);
+            if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)");
+            if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)");
+            z->depth = stbi__get8(s);  if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16)  return stbi__err("1/2/4/8/16-bit only","PNG not supported: 1/2/4/8/16-bit only");
+            color = stbi__get8(s);  if (color > 6)         return stbi__err("bad ctype","Corrupt PNG");
+            if (color == 3 && z->depth == 16)                  return stbi__err("bad ctype","Corrupt PNG");
+            if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG");
+            comp  = stbi__get8(s);  if (comp) return stbi__err("bad comp method","Corrupt PNG");
+            filter= stbi__get8(s);  if (filter) return stbi__err("bad filter method","Corrupt PNG");
+            interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG");
+            if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG");
+            if (!pal_img_n) {
+               s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
+               if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode");
+               if (scan == STBI__SCAN_header) return 1;
+            } else {
+               // if paletted, then pal_n is our final components, and
+               // img_n is # components to decompress/filter.
+               s->img_n = 1;
+               if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG");
+               // if SCAN_header, have to scan to see if we have a tRNS
+            }
+            break;
+         }
+
+         case STBI__PNG_TYPE('P','L','T','E'):  {
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (c.length > 256*3) return stbi__err("invalid PLTE","Corrupt PNG");
+            pal_len = c.length / 3;
+            if (pal_len * 3 != c.length) return stbi__err("invalid PLTE","Corrupt PNG");
+            for (i=0; i < pal_len; ++i) {
+               palette[i*4+0] = stbi__get8(s);
+               palette[i*4+1] = stbi__get8(s);
+               palette[i*4+2] = stbi__get8(s);
+               palette[i*4+3] = 255;
+            }
+            break;
+         }
+
+         case STBI__PNG_TYPE('t','R','N','S'): {
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (z->idata) return stbi__err("tRNS after IDAT","Corrupt PNG");
+            if (pal_img_n) {
+               if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; }
+               if (pal_len == 0) return stbi__err("tRNS before PLTE","Corrupt PNG");
+               if (c.length > pal_len) return stbi__err("bad tRNS len","Corrupt PNG");
+               pal_img_n = 4;
+               for (i=0; i < c.length; ++i)
+                  palette[i*4+3] = stbi__get8(s);
+            } else {
+               if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG");
+               if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG");
+               has_trans = 1;
+               if (z->depth == 16) {
+                  for (k = 0; k < s->img_n; ++k) tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is
+               } else {
+                  for (k = 0; k < s->img_n; ++k) tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger
+               }
+            }
+            break;
+         }
+
+         case STBI__PNG_TYPE('I','D','A','T'): {
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG");
+            if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; }
+            if ((int)(ioff + c.length) < (int)ioff) return 0;
+            if (ioff + c.length > idata_limit) {
+               stbi__uint32 idata_limit_old = idata_limit;
+               stbi_uc *p;
+               if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
+               while (ioff + c.length > idata_limit)
+                  idata_limit *= 2;
+               STBI_NOTUSED(idata_limit_old);
+               p = (stbi_uc *) STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit); if (p == NULL) return stbi__err("outofmem", "Out of memory");
+               z->idata = p;
+            }
+            if (!stbi__getn(s, z->idata+ioff,c.length)) return stbi__err("outofdata","Corrupt PNG");
+            ioff += c.length;
+            break;
+         }
+
+         case STBI__PNG_TYPE('I','E','N','D'): {
+            stbi__uint32 raw_len, bpl;
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (scan != STBI__SCAN_load) return 1;
+            if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG");
+            // initial guess for decoded data size to avoid unnecessary reallocs
+            bpl = (s->img_x * z->depth + 7) / 8; // bytes per line, per component
+            raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */;
+            z->expanded = (stbi_uc *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone);
+            if (z->expanded == NULL) return 0; // zlib should set error
+            STBI_FREE(z->idata); z->idata = NULL;
+            if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans)
+               s->img_out_n = s->img_n+1;
+            else
+               s->img_out_n = s->img_n;
+            if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, z->depth, color, interlace)) return 0;
+            if (has_trans) {
+               if (z->depth == 16) {
+                  if (!stbi__compute_transparency16(z, tc16, s->img_out_n)) return 0;
+               } else {
+                  if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0;
+               }
+            }
+            if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2)
+               stbi__de_iphone(z);
+            if (pal_img_n) {
+               // pal_img_n == 3 or 4
+               s->img_n = pal_img_n; // record the actual colors we had
+               s->img_out_n = pal_img_n;
+               if (req_comp >= 3) s->img_out_n = req_comp;
+               if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n))
+                  return 0;
+            } else if (has_trans) {
+               // non-paletted image with tRNS -> source image has (constant) alpha
+               ++s->img_n;
+            }
+            STBI_FREE(z->expanded); z->expanded = NULL;
+            // end of PNG chunk, read and skip CRC
+            stbi__get32be(s);
+            return 1;
+         }
+
+         default:
+            // if critical, fail
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if ((c.type & (1 << 29)) == 0) {
+               #ifndef STBI_NO_FAILURE_STRINGS
+               // not threadsafe
+               static char invalid_chunk[] = "XXXX PNG chunk not known";
+               invalid_chunk[0] = STBI__BYTECAST(c.type >> 24);
+               invalid_chunk[1] = STBI__BYTECAST(c.type >> 16);
+               invalid_chunk[2] = STBI__BYTECAST(c.type >>  8);
+               invalid_chunk[3] = STBI__BYTECAST(c.type >>  0);
+               #endif
+               return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type");
+            }
+            stbi__skip(s, c.length);
+            break;
+      }
+      // end of PNG chunk, read and skip CRC
+      stbi__get32be(s);
+   }
+}
+
+static void *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp, stbi__result_info *ri)
+{
+   void *result=NULL;
+   if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+   if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) {
+      if (p->depth <= 8)
+         ri->bits_per_channel = 8;
+      else if (p->depth == 16)
+         ri->bits_per_channel = 16;
+      else
+         return stbi__errpuc("bad bits_per_channel", "PNG not supported: unsupported color depth");
+      result = p->out;
+      p->out = NULL;
+      if (req_comp && req_comp != p->s->img_out_n) {
+         if (ri->bits_per_channel == 8)
+            result = stbi__convert_format((unsigned char *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
+         else
+            result = stbi__convert_format16((stbi__uint16 *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
+         p->s->img_out_n = req_comp;
+         if (result == NULL) return result;
+      }
+      *x = p->s->img_x;
+      *y = p->s->img_y;
+      if (n) *n = p->s->img_n;
+   }
+   STBI_FREE(p->out);      p->out      = NULL;
+   STBI_FREE(p->expanded); p->expanded = NULL;
+   STBI_FREE(p->idata);    p->idata    = NULL;
+
+   return result;
+}
+
+static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   stbi__png p;
+   p.s = s;
+   return stbi__do_png(&p, x,y,comp,req_comp, ri);
+}
+
+static int stbi__png_test(stbi__context *s)
+{
+   int r;
+   r = stbi__check_png_header(s);
+   stbi__rewind(s);
+   return r;
+}
+
+static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp)
+{
+   if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) {
+      stbi__rewind( p->s );
+      return 0;
+   }
+   if (x) *x = p->s->img_x;
+   if (y) *y = p->s->img_y;
+   if (comp) *comp = p->s->img_n;
+   return 1;
+}
+
+static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   stbi__png p;
+   p.s = s;
+   return stbi__png_info_raw(&p, x, y, comp);
+}
+
+static int stbi__png_is16(stbi__context *s)
+{
+   stbi__png p;
+   p.s = s;
+   if (!stbi__png_info_raw(&p, NULL, NULL, NULL))
+           return 0;
+   if (p.depth != 16) {
+      stbi__rewind(p.s);
+      return 0;
+   }
+   return 1;
+}
+#endif
+
+// Microsoft/Windows BMP image
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_test_raw(stbi__context *s)
+{
+   int r;
+   int sz;
+   if (stbi__get8(s) != 'B') return 0;
+   if (stbi__get8(s) != 'M') return 0;
+   stbi__get32le(s); // discard filesize
+   stbi__get16le(s); // discard reserved
+   stbi__get16le(s); // discard reserved
+   stbi__get32le(s); // discard data offset
+   sz = stbi__get32le(s);
+   r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124);
+   return r;
+}
+
+static int stbi__bmp_test(stbi__context *s)
+{
+   int r = stbi__bmp_test_raw(s);
+   stbi__rewind(s);
+   return r;
+}
+
+
+// returns 0..31 for the highest set bit
+static int stbi__high_bit(unsigned int z)
+{
+   int n=0;
+   if (z == 0) return -1;
+   if (z >= 0x10000) { n += 16; z >>= 16; }
+   if (z >= 0x00100) { n +=  8; z >>=  8; }
+   if (z >= 0x00010) { n +=  4; z >>=  4; }
+   if (z >= 0x00004) { n +=  2; z >>=  2; }
+   if (z >= 0x00002) { n +=  1;/* >>=  1;*/ }
+   return n;
+}
+
+static int stbi__bitcount(unsigned int a)
+{
+   a = (a & 0x55555555) + ((a >>  1) & 0x55555555); // max 2
+   a = (a & 0x33333333) + ((a >>  2) & 0x33333333); // max 4
+   a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
+   a = (a + (a >> 8)); // max 16 per 8 bits
+   a = (a + (a >> 16)); // max 32 per 8 bits
+   return a & 0xff;
+}
+
+// extract an arbitrarily-aligned N-bit value (N=bits)
+// from v, and then make it 8-bits long and fractionally
+// extend it to full full range.
+static int stbi__shiftsigned(unsigned int v, int shift, int bits)
+{
+   static unsigned int mul_table[9] = {
+      0,
+      0xff/*0b11111111*/, 0x55/*0b01010101*/, 0x49/*0b01001001*/, 0x11/*0b00010001*/,
+      0x21/*0b00100001*/, 0x41/*0b01000001*/, 0x81/*0b10000001*/, 0x01/*0b00000001*/,
+   };
+   static unsigned int shift_table[9] = {
+      0, 0,0,1,0,2,4,6,0,
+   };
+   if (shift < 0)
+      v <<= -shift;
+   else
+      v >>= shift;
+   STBI_ASSERT(v < 256);
+   v >>= (8-bits);
+   STBI_ASSERT(bits >= 0 && bits <= 8);
+   return (int) ((unsigned) v * mul_table[bits]) >> shift_table[bits];
+}
+
+typedef struct
+{
+   int bpp, offset, hsz;
+   unsigned int mr,mg,mb,ma, all_a;
+   int extra_read;
+} stbi__bmp_data;
+
+static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info)
+{
+   int hsz;
+   if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP");
+   stbi__get32le(s); // discard filesize
+   stbi__get16le(s); // discard reserved
+   stbi__get16le(s); // discard reserved
+   info->offset = stbi__get32le(s);
+   info->hsz = hsz = stbi__get32le(s);
+   info->mr = info->mg = info->mb = info->ma = 0;
+   info->extra_read = 14;
+
+   if (info->offset < 0) return stbi__errpuc("bad BMP", "bad BMP");
+
+   if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown");
+   if (hsz == 12) {
+      s->img_x = stbi__get16le(s);
+      s->img_y = stbi__get16le(s);
+   } else {
+      s->img_x = stbi__get32le(s);
+      s->img_y = stbi__get32le(s);
+   }
+   if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP");
+   info->bpp = stbi__get16le(s);
+   if (hsz != 12) {
+      int compress = stbi__get32le(s);
+      if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE");
+      stbi__get32le(s); // discard sizeof
+      stbi__get32le(s); // discard hres
+      stbi__get32le(s); // discard vres
+      stbi__get32le(s); // discard colorsused
+      stbi__get32le(s); // discard max important
+      if (hsz == 40 || hsz == 56) {
+         if (hsz == 56) {
+            stbi__get32le(s);
+            stbi__get32le(s);
+            stbi__get32le(s);
+            stbi__get32le(s);
+         }
+         if (info->bpp == 16 || info->bpp == 32) {
+            if (compress == 0) {
+               if (info->bpp == 32) {
+                  info->mr = 0xffu << 16;
+                  info->mg = 0xffu <<  8;
+                  info->mb = 0xffu <<  0;
+                  info->ma = 0xffu << 24;
+                  info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0
+               } else {
+                  info->mr = 31u << 10;
+                  info->mg = 31u <<  5;
+                  info->mb = 31u <<  0;
+               }
+            } else if (compress == 3) {
+               info->mr = stbi__get32le(s);
+               info->mg = stbi__get32le(s);
+               info->mb = stbi__get32le(s);
+               info->extra_read += 12;
+               // not documented, but generated by photoshop and handled by mspaint
+               if (info->mr == info->mg && info->mg == info->mb) {
+                  // ?!?!?
+                  return stbi__errpuc("bad BMP", "bad BMP");
+               }
+            } else
+               return stbi__errpuc("bad BMP", "bad BMP");
+         }
+      } else {
+         int i;
+         if (hsz != 108 && hsz != 124)
+            return stbi__errpuc("bad BMP", "bad BMP");
+         info->mr = stbi__get32le(s);
+         info->mg = stbi__get32le(s);
+         info->mb = stbi__get32le(s);
+         info->ma = stbi__get32le(s);
+         stbi__get32le(s); // discard color space
+         for (i=0; i < 12; ++i)
+            stbi__get32le(s); // discard color space parameters
+         if (hsz == 124) {
+            stbi__get32le(s); // discard rendering intent
+            stbi__get32le(s); // discard offset of profile data
+            stbi__get32le(s); // discard size of profile data
+            stbi__get32le(s); // discard reserved
+         }
+      }
+   }
+   return (void *) 1;
+}
+
+
+static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   stbi_uc *out;
+   unsigned int mr=0,mg=0,mb=0,ma=0, all_a;
+   stbi_uc pal[256][4];
+   int psize=0,i,j,width;
+   int flip_vertically, pad, target;
+   stbi__bmp_data info;
+   STBI_NOTUSED(ri);
+
+   info.all_a = 255;
+   if (stbi__bmp_parse_header(s, &info) == NULL)
+      return NULL; // error code already set
+
+   flip_vertically = ((int) s->img_y) > 0;
+   s->img_y = abs((int) s->img_y);
+
+   if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
+   if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
+
+   mr = info.mr;
+   mg = info.mg;
+   mb = info.mb;
+   ma = info.ma;
+   all_a = info.all_a;
+
+   if (info.hsz == 12) {
+      if (info.bpp < 24)
+         psize = (info.offset - info.extra_read - 24) / 3;
+   } else {
+      if (info.bpp < 16)
+         psize = (info.offset - info.extra_read - info.hsz) >> 2;
+   }
+   if (psize == 0) {
+      STBI_ASSERT(info.offset == s->callback_already_read + (int) (s->img_buffer - s->img_buffer_original));
+      if (info.offset != s->callback_already_read + (s->img_buffer - s->buffer_start)) {
+        return stbi__errpuc("bad offset", "Corrupt BMP");
+      }
+   }
+
+   if (info.bpp == 24 && ma == 0xff000000)
+      s->img_n = 3;
+   else
+      s->img_n = ma ? 4 : 3;
+   if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
+      target = req_comp;
+   else
+      target = s->img_n; // if they want monochrome, we'll post-convert
+
+   // sanity-check size
+   if (!stbi__mad3sizes_valid(target, s->img_x, s->img_y, 0))
+      return stbi__errpuc("too large", "Corrupt BMP");
+
+   out = (stbi_uc *) stbi__malloc_mad3(target, s->img_x, s->img_y, 0);
+   if (!out) return stbi__errpuc("outofmem", "Out of memory");
+   if (info.bpp < 16) {
+      int z=0;
+      if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); }
+      for (i=0; i < psize; ++i) {
+         pal[i][2] = stbi__get8(s);
+         pal[i][1] = stbi__get8(s);
+         pal[i][0] = stbi__get8(s);
+         if (info.hsz != 12) stbi__get8(s);
+         pal[i][3] = 255;
+      }
+      stbi__skip(s, info.offset - info.extra_read - info.hsz - psize * (info.hsz == 12 ? 3 : 4));
+      if (info.bpp == 1) width = (s->img_x + 7) >> 3;
+      else if (info.bpp == 4) width = (s->img_x + 1) >> 1;
+      else if (info.bpp == 8) width = s->img_x;
+      else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); }
+      pad = (-width)&3;
+      if (info.bpp == 1) {
+         for (j=0; j < (int) s->img_y; ++j) {
+            int bit_offset = 7, v = stbi__get8(s);
+            for (i=0; i < (int) s->img_x; ++i) {
+               int color = (v>>bit_offset)&0x1;
+               out[z++] = pal[color][0];
+               out[z++] = pal[color][1];
+               out[z++] = pal[color][2];
+               if (target == 4) out[z++] = 255;
+               if (i+1 == (int) s->img_x) break;
+               if((--bit_offset) < 0) {
+                  bit_offset = 7;
+                  v = stbi__get8(s);
+               }
+            }
+            stbi__skip(s, pad);
+         }
+      } else {
+         for (j=0; j < (int) s->img_y; ++j) {
+            for (i=0; i < (int) s->img_x; i += 2) {
+               int v=stbi__get8(s),v2=0;
+               if (info.bpp == 4) {
+                  v2 = v & 15;
+                  v >>= 4;
+               }
+               out[z++] = pal[v][0];
+               out[z++] = pal[v][1];
+               out[z++] = pal[v][2];
+               if (target == 4) out[z++] = 255;
+               if (i+1 == (int) s->img_x) break;
+               v = (info.bpp == 8) ? stbi__get8(s) : v2;
+               out[z++] = pal[v][0];
+               out[z++] = pal[v][1];
+               out[z++] = pal[v][2];
+               if (target == 4) out[z++] = 255;
+            }
+            stbi__skip(s, pad);
+         }
+      }
+   } else {
+      int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0;
+      int z = 0;
+      int easy=0;
+      stbi__skip(s, info.offset - info.extra_read - info.hsz);
+      if (info.bpp == 24) width = 3 * s->img_x;
+      else if (info.bpp == 16) width = 2*s->img_x;
+      else /* bpp = 32 and pad = 0 */ width=0;
+      pad = (-width) & 3;
+      if (info.bpp == 24) {
+         easy = 1;
+      } else if (info.bpp == 32) {
+         if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000)
+            easy = 2;
+      }
+      if (!easy) {
+         if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); }
+         // right shift amt to put high bit in position #7
+         rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr);
+         gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg);
+         bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb);
+         ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma);
+         if (rcount > 8 || gcount > 8 || bcount > 8 || acount > 8) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); }
+      }
+      for (j=0; j < (int) s->img_y; ++j) {
+         if (easy) {
+            for (i=0; i < (int) s->img_x; ++i) {
+               unsigned char a;
+               out[z+2] = stbi__get8(s);
+               out[z+1] = stbi__get8(s);
+               out[z+0] = stbi__get8(s);
+               z += 3;
+               a = (easy == 2 ? stbi__get8(s) : 255);
+               all_a |= a;
+               if (target == 4) out[z++] = a;
+            }
+         } else {
+            int bpp = info.bpp;
+            for (i=0; i < (int) s->img_x; ++i) {
+               stbi__uint32 v = (bpp == 16 ? (stbi__uint32) stbi__get16le(s) : stbi__get32le(s));
+               unsigned int a;
+               out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount));
+               out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount));
+               out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount));
+               a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255);
+               all_a |= a;
+               if (target == 4) out[z++] = STBI__BYTECAST(a);
+            }
+         }
+         stbi__skip(s, pad);
+      }
+   }
+
+   // if alpha channel is all 0s, replace with all 255s
+   if (target == 4 && all_a == 0)
+      for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4)
+         out[i] = 255;
+
+   if (flip_vertically) {
+      stbi_uc t;
+      for (j=0; j < (int) s->img_y>>1; ++j) {
+         stbi_uc *p1 = out +      j     *s->img_x*target;
+         stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target;
+         for (i=0; i < (int) s->img_x*target; ++i) {
+            t = p1[i]; p1[i] = p2[i]; p2[i] = t;
+         }
+      }
+   }
+
+   if (req_comp && req_comp != target) {
+      out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y);
+      if (out == NULL) return out; // stbi__convert_format frees input on failure
+   }
+
+   *x = s->img_x;
+   *y = s->img_y;
+   if (comp) *comp = s->img_n;
+   return out;
+}
+#endif
+
+// Targa Truevision - TGA
+// by Jonathan Dummer
+#ifndef STBI_NO_TGA
+// returns STBI_rgb or whatever, 0 on error
+static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16)
+{
+   // only RGB or RGBA (incl. 16bit) or grey allowed
+   if (is_rgb16) *is_rgb16 = 0;
+   switch(bits_per_pixel) {
+      case 8:  return STBI_grey;
+      case 16: if(is_grey) return STBI_grey_alpha;
+               // fallthrough
+      case 15: if(is_rgb16) *is_rgb16 = 1;
+               return STBI_rgb;
+      case 24: // fallthrough
+      case 32: return bits_per_pixel/8;
+      default: return 0;
+   }
+}
+
+static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp)
+{
+    int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp;
+    int sz, tga_colormap_type;
+    stbi__get8(s);                   // discard Offset
+    tga_colormap_type = stbi__get8(s); // colormap type
+    if( tga_colormap_type > 1 ) {
+        stbi__rewind(s);
+        return 0;      // only RGB or indexed allowed
+    }
+    tga_image_type = stbi__get8(s); // image type
+    if ( tga_colormap_type == 1 ) { // colormapped (paletted) image
+        if (tga_image_type != 1 && tga_image_type != 9) {
+            stbi__rewind(s);
+            return 0;
+        }
+        stbi__skip(s,4);       // skip index of first colormap entry and number of entries
+        sz = stbi__get8(s);    //   check bits per palette color entry
+        if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) {
+            stbi__rewind(s);
+            return 0;
+        }
+        stbi__skip(s,4);       // skip image x and y origin
+        tga_colormap_bpp = sz;
+    } else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE
+        if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) {
+            stbi__rewind(s);
+            return 0; // only RGB or grey allowed, +/- RLE
+        }
+        stbi__skip(s,9); // skip colormap specification and image x/y origin
+        tga_colormap_bpp = 0;
+    }
+    tga_w = stbi__get16le(s);
+    if( tga_w < 1 ) {
+        stbi__rewind(s);
+        return 0;   // test width
+    }
+    tga_h = stbi__get16le(s);
+    if( tga_h < 1 ) {
+        stbi__rewind(s);
+        return 0;   // test height
+    }
+    tga_bits_per_pixel = stbi__get8(s); // bits per pixel
+    stbi__get8(s); // ignore alpha bits
+    if (tga_colormap_bpp != 0) {
+        if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) {
+            // when using a colormap, tga_bits_per_pixel is the size of the indexes
+            // I don't think anything but 8 or 16bit indexes makes sense
+            stbi__rewind(s);
+            return 0;
+        }
+        tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL);
+    } else {
+        tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL);
+    }
+    if(!tga_comp) {
+      stbi__rewind(s);
+      return 0;
+    }
+    if (x) *x = tga_w;
+    if (y) *y = tga_h;
+    if (comp) *comp = tga_comp;
+    return 1;                   // seems to have passed everything
+}
+
+static int stbi__tga_test(stbi__context *s)
+{
+   int res = 0;
+   int sz, tga_color_type;
+   stbi__get8(s);      //   discard Offset
+   tga_color_type = stbi__get8(s);   //   color type
+   if ( tga_color_type > 1 ) goto errorEnd;   //   only RGB or indexed allowed
+   sz = stbi__get8(s);   //   image type
+   if ( tga_color_type == 1 ) { // colormapped (paletted) image
+      if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9
+      stbi__skip(s,4);       // skip index of first colormap entry and number of entries
+      sz = stbi__get8(s);    //   check bits per palette color entry
+      if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
+      stbi__skip(s,4);       // skip image x and y origin
+   } else { // "normal" image w/o colormap
+      if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE
+      stbi__skip(s,9); // skip colormap specification and image x/y origin
+   }
+   if ( stbi__get16le(s) < 1 ) goto errorEnd;      //   test width
+   if ( stbi__get16le(s) < 1 ) goto errorEnd;      //   test height
+   sz = stbi__get8(s);   //   bits per pixel
+   if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index
+   if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
+
+   res = 1; // if we got this far, everything's good and we can return 1 instead of 0
+
+errorEnd:
+   stbi__rewind(s);
+   return res;
+}
+
+// read 16bit value and convert to 24bit RGB
+static void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out)
+{
+   stbi__uint16 px = (stbi__uint16)stbi__get16le(s);
+   stbi__uint16 fiveBitMask = 31;
+   // we have 3 channels with 5bits each
+   int r = (px >> 10) & fiveBitMask;
+   int g = (px >> 5) & fiveBitMask;
+   int b = px & fiveBitMask;
+   // Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later
+   out[0] = (stbi_uc)((r * 255)/31);
+   out[1] = (stbi_uc)((g * 255)/31);
+   out[2] = (stbi_uc)((b * 255)/31);
+
+   // some people claim that the most significant bit might be used for alpha
+   // (possibly if an alpha-bit is set in the "image descriptor byte")
+   // but that only made 16bit test images completely translucent..
+   // so let's treat all 15 and 16bit TGAs as RGB with no alpha.
+}
+
+static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   //   read in the TGA header stuff
+   int tga_offset = stbi__get8(s);
+   int tga_indexed = stbi__get8(s);
+   int tga_image_type = stbi__get8(s);
+   int tga_is_RLE = 0;
+   int tga_palette_start = stbi__get16le(s);
+   int tga_palette_len = stbi__get16le(s);
+   int tga_palette_bits = stbi__get8(s);
+   int tga_x_origin = stbi__get16le(s);
+   int tga_y_origin = stbi__get16le(s);
+   int tga_width = stbi__get16le(s);
+   int tga_height = stbi__get16le(s);
+   int tga_bits_per_pixel = stbi__get8(s);
+   int tga_comp, tga_rgb16=0;
+   int tga_inverted = stbi__get8(s);
+   // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?)
+   //   image data
+   unsigned char *tga_data;
+   unsigned char *tga_palette = NULL;
+   int i, j;
+   unsigned char raw_data[4] = {0};
+   int RLE_count = 0;
+   int RLE_repeating = 0;
+   int read_next_pixel = 1;
+   STBI_NOTUSED(ri);
+   STBI_NOTUSED(tga_x_origin); // @TODO
+   STBI_NOTUSED(tga_y_origin); // @TODO
+
+   if (tga_height > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
+   if (tga_width > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
+
+   //   do a tiny bit of precessing
+   if ( tga_image_type >= 8 )
+   {
+      tga_image_type -= 8;
+      tga_is_RLE = 1;
+   }
+   tga_inverted = 1 - ((tga_inverted >> 5) & 1);
+
+   //   If I'm paletted, then I'll use the number of bits from the palette
+   if ( tga_indexed ) tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16);
+   else tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16);
+
+   if(!tga_comp) // shouldn't really happen, stbi__tga_test() should have ensured basic consistency
+      return stbi__errpuc("bad format", "Can't find out TGA pixelformat");
+
+   //   tga info
+   *x = tga_width;
+   *y = tga_height;
+   if (comp) *comp = tga_comp;
+
+   if (!stbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0))
+      return stbi__errpuc("too large", "Corrupt TGA");
+
+   tga_data = (unsigned char*)stbi__malloc_mad3(tga_width, tga_height, tga_comp, 0);
+   if (!tga_data) return stbi__errpuc("outofmem", "Out of memory");
+
+   // skip to the data's starting position (offset usually = 0)
+   stbi__skip(s, tga_offset );
+
+   if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) {
+      for (i=0; i < tga_height; ++i) {
+         int row = tga_inverted ? tga_height -i - 1 : i;
+         stbi_uc *tga_row = tga_data + row*tga_width*tga_comp;
+         stbi__getn(s, tga_row, tga_width * tga_comp);
+      }
+   } else  {
+      //   do I need to load a palette?
+      if ( tga_indexed)
+      {
+         if (tga_palette_len == 0) {  /* you have to have at least one entry! */
+            STBI_FREE(tga_data);
+            return stbi__errpuc("bad palette", "Corrupt TGA");
+         }
+
+         //   any data to skip? (offset usually = 0)
+         stbi__skip(s, tga_palette_start );
+         //   load the palette
+         tga_palette = (unsigned char*)stbi__malloc_mad2(tga_palette_len, tga_comp, 0);
+         if (!tga_palette) {
+            STBI_FREE(tga_data);
+            return stbi__errpuc("outofmem", "Out of memory");
+         }
+         if (tga_rgb16) {
+            stbi_uc *pal_entry = tga_palette;
+            STBI_ASSERT(tga_comp == STBI_rgb);
+            for (i=0; i < tga_palette_len; ++i) {
+               stbi__tga_read_rgb16(s, pal_entry);
+               pal_entry += tga_comp;
+            }
+         } else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) {
+               STBI_FREE(tga_data);
+               STBI_FREE(tga_palette);
+               return stbi__errpuc("bad palette", "Corrupt TGA");
+         }
+      }
+      //   load the data
+      for (i=0; i < tga_width * tga_height; ++i)
+      {
+         //   if I'm in RLE mode, do I need to get a RLE stbi__pngchunk?
+         if ( tga_is_RLE )
+         {
+            if ( RLE_count == 0 )
+            {
+               //   yep, get the next byte as a RLE command
+               int RLE_cmd = stbi__get8(s);
+               RLE_count = 1 + (RLE_cmd & 127);
+               RLE_repeating = RLE_cmd >> 7;
+               read_next_pixel = 1;
+            } else if ( !RLE_repeating )
+            {
+               read_next_pixel = 1;
+            }
+         } else
+         {
+            read_next_pixel = 1;
+         }
+         //   OK, if I need to read a pixel, do it now
+         if ( read_next_pixel )
+         {
+            //   load however much data we did have
+            if ( tga_indexed )
+            {
+               // read in index, then perform the lookup
+               int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s);
+               if ( pal_idx >= tga_palette_len ) {
+                  // invalid index
+                  pal_idx = 0;
+               }
+               pal_idx *= tga_comp;
+               for (j = 0; j < tga_comp; ++j) {
+                  raw_data[j] = tga_palette[pal_idx+j];
+               }
+            } else if(tga_rgb16) {
+               STBI_ASSERT(tga_comp == STBI_rgb);
+               stbi__tga_read_rgb16(s, raw_data);
+            } else {
+               //   read in the data raw
+               for (j = 0; j < tga_comp; ++j) {
+                  raw_data[j] = stbi__get8(s);
+               }
+            }
+            //   clear the reading flag for the next pixel
+            read_next_pixel = 0;
+         } // end of reading a pixel
+
+         // copy data
+         for (j = 0; j < tga_comp; ++j)
+           tga_data[i*tga_comp+j] = raw_data[j];
+
+         //   in case we're in RLE mode, keep counting down
+         --RLE_count;
+      }
+      //   do I need to invert the image?
+      if ( tga_inverted )
+      {
+         for (j = 0; j*2 < tga_height; ++j)
+         {
+            int index1 = j * tga_width * tga_comp;
+            int index2 = (tga_height - 1 - j) * tga_width * tga_comp;
+            for (i = tga_width * tga_comp; i > 0; --i)
+            {
+               unsigned char temp = tga_data[index1];
+               tga_data[index1] = tga_data[index2];
+               tga_data[index2] = temp;
+               ++index1;
+               ++index2;
+            }
+         }
+      }
+      //   clear my palette, if I had one
+      if ( tga_palette != NULL )
+      {
+         STBI_FREE( tga_palette );
+      }
+   }
+
+   // swap RGB - if the source data was RGB16, it already is in the right order
+   if (tga_comp >= 3 && !tga_rgb16)
+   {
+      unsigned char* tga_pixel = tga_data;
+      for (i=0; i < tga_width * tga_height; ++i)
+      {
+         unsigned char temp = tga_pixel[0];
+         tga_pixel[0] = tga_pixel[2];
+         tga_pixel[2] = temp;
+         tga_pixel += tga_comp;
+      }
+   }
+
+   // convert to target component count
+   if (req_comp && req_comp != tga_comp)
+      tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height);
+
+   //   the things I do to get rid of an error message, and yet keep
+   //   Microsoft's C compilers happy... [8^(
+   tga_palette_start = tga_palette_len = tga_palette_bits =
+         tga_x_origin = tga_y_origin = 0;
+   STBI_NOTUSED(tga_palette_start);
+   //   OK, done
+   return tga_data;
+}
+#endif
+
+// *************************************************************************************************
+// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_test(stbi__context *s)
+{
+   int r = (stbi__get32be(s) == 0x38425053);
+   stbi__rewind(s);
+   return r;
+}
+
+static int stbi__psd_decode_rle(stbi__context *s, stbi_uc *p, int pixelCount)
+{
+   int count, nleft, len;
+
+   count = 0;
+   while ((nleft = pixelCount - count) > 0) {
+      len = stbi__get8(s);
+      if (len == 128) {
+         // No-op.
+      } else if (len < 128) {
+         // Copy next len+1 bytes literally.
+         len++;
+         if (len > nleft) return 0; // corrupt data
+         count += len;
+         while (len) {
+            *p = stbi__get8(s);
+            p += 4;
+            len--;
+         }
+      } else if (len > 128) {
+         stbi_uc   val;
+         // Next -len+1 bytes in the dest are replicated from next source byte.
+         // (Interpret len as a negative 8-bit int.)
+         len = 257 - len;
+         if (len > nleft) return 0; // corrupt data
+         val = stbi__get8(s);
+         count += len;
+         while (len) {
+            *p = val;
+            p += 4;
+            len--;
+         }
+      }
+   }
+
+   return 1;
+}
+
+static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc)
+{
+   int pixelCount;
+   int channelCount, compression;
+   int channel, i;
+   int bitdepth;
+   int w,h;
+   stbi_uc *out;
+   STBI_NOTUSED(ri);
+
+   // Check identifier
+   if (stbi__get32be(s) != 0x38425053)   // "8BPS"
+      return stbi__errpuc("not PSD", "Corrupt PSD image");
+
+   // Check file type version.
+   if (stbi__get16be(s) != 1)
+      return stbi__errpuc("wrong version", "Unsupported version of PSD image");
+
+   // Skip 6 reserved bytes.
+   stbi__skip(s, 6 );
+
+   // Read the number of channels (R, G, B, A, etc).
+   channelCount = stbi__get16be(s);
+   if (channelCount < 0 || channelCount > 16)
+      return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image");
+
+   // Read the rows and columns of the image.
+   h = stbi__get32be(s);
+   w = stbi__get32be(s);
+
+   if (h > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
+   if (w > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
+
+   // Make sure the depth is 8 bits.
+   bitdepth = stbi__get16be(s);
+   if (bitdepth != 8 && bitdepth != 16)
+      return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit");
+
+   // Make sure the color mode is RGB.
+   // Valid options are:
+   //   0: Bitmap
+   //   1: Grayscale
+   //   2: Indexed color
+   //   3: RGB color
+   //   4: CMYK color
+   //   7: Multichannel
+   //   8: Duotone
+   //   9: Lab color
+   if (stbi__get16be(s) != 3)
+      return stbi__errpuc("wrong color format", "PSD is not in RGB color format");
+
+   // Skip the Mode Data.  (It's the palette for indexed color; other info for other modes.)
+   stbi__skip(s,stbi__get32be(s) );
+
+   // Skip the image resources.  (resolution, pen tool paths, etc)
+   stbi__skip(s, stbi__get32be(s) );
+
+   // Skip the reserved data.
+   stbi__skip(s, stbi__get32be(s) );
+
+   // Find out if the data is compressed.
+   // Known values:
+   //   0: no compression
+   //   1: RLE compressed
+   compression = stbi__get16be(s);
+   if (compression > 1)
+      return stbi__errpuc("bad compression", "PSD has an unknown compression format");
+
+   // Check size
+   if (!stbi__mad3sizes_valid(4, w, h, 0))
+      return stbi__errpuc("too large", "Corrupt PSD");
+
+   // Create the destination image.
+
+   if (!compression && bitdepth == 16 && bpc == 16) {
+      out = (stbi_uc *) stbi__malloc_mad3(8, w, h, 0);
+      ri->bits_per_channel = 16;
+   } else
+      out = (stbi_uc *) stbi__malloc(4 * w*h);
+
+   if (!out) return stbi__errpuc("outofmem", "Out of memory");
+   pixelCount = w*h;
+
+   // Initialize the data to zero.
+   //memset( out, 0, pixelCount * 4 );
+
+   // Finally, the image data.
+   if (compression) {
+      // RLE as used by .PSD and .TIFF
+      // Loop until you get the number of unpacked bytes you are expecting:
+      //     Read the next source byte into n.
+      //     If n is between 0 and 127 inclusive, copy the next n+1 bytes literally.
+      //     Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times.
+      //     Else if n is 128, noop.
+      // Endloop
+
+      // The RLE-compressed data is preceded by a 2-byte data count for each row in the data,
+      // which we're going to just skip.
+      stbi__skip(s, h * channelCount * 2 );
+
+      // Read the RLE data by channel.
+      for (channel = 0; channel < 4; channel++) {
+         stbi_uc *p;
+
+         p = out+channel;
+         if (channel >= channelCount) {
+            // Fill this channel with default data.
+            for (i = 0; i < pixelCount; i++, p += 4)
+               *p = (channel == 3 ? 255 : 0);
+         } else {
+            // Read the RLE data.
+            if (!stbi__psd_decode_rle(s, p, pixelCount)) {
+               STBI_FREE(out);
+               return stbi__errpuc("corrupt", "bad RLE data");
+            }
+         }
+      }
+
+   } else {
+      // We're at the raw image data.  It's each channel in order (Red, Green, Blue, Alpha, ...)
+      // where each channel consists of an 8-bit (or 16-bit) value for each pixel in the image.
+
+      // Read the data by channel.
+      for (channel = 0; channel < 4; channel++) {
+         if (channel >= channelCount) {
+            // Fill this channel with default data.
+            if (bitdepth == 16 && bpc == 16) {
+               stbi__uint16 *q = ((stbi__uint16 *) out) + channel;
+               stbi__uint16 val = channel == 3 ? 65535 : 0;
+               for (i = 0; i < pixelCount; i++, q += 4)
+                  *q = val;
+            } else {
+               stbi_uc *p = out+channel;
+               stbi_uc val = channel == 3 ? 255 : 0;
+               for (i = 0; i < pixelCount; i++, p += 4)
+                  *p = val;
+            }
+         } else {
+            if (ri->bits_per_channel == 16) {    // output bpc
+               stbi__uint16 *q = ((stbi__uint16 *) out) + channel;
+               for (i = 0; i < pixelCount; i++, q += 4)
+                  *q = (stbi__uint16) stbi__get16be(s);
+            } else {
+               stbi_uc *p = out+channel;
+               if (bitdepth == 16) {  // input bpc
+                  for (i = 0; i < pixelCount; i++, p += 4)
+                     *p = (stbi_uc) (stbi__get16be(s) >> 8);
+               } else {
+                  for (i = 0; i < pixelCount; i++, p += 4)
+                     *p = stbi__get8(s);
+               }
+            }
+         }
+      }
+   }
+
+   // remove weird white matte from PSD
+   if (channelCount >= 4) {
+      if (ri->bits_per_channel == 16) {
+         for (i=0; i < w*h; ++i) {
+            stbi__uint16 *pixel = (stbi__uint16 *) out + 4*i;
+            if (pixel[3] != 0 && pixel[3] != 65535) {
+               float a = pixel[3] / 65535.0f;
+               float ra = 1.0f / a;
+               float inv_a = 65535.0f * (1 - ra);
+               pixel[0] = (stbi__uint16) (pixel[0]*ra + inv_a);
+               pixel[1] = (stbi__uint16) (pixel[1]*ra + inv_a);
+               pixel[2] = (stbi__uint16) (pixel[2]*ra + inv_a);
+            }
+         }
+      } else {
+         for (i=0; i < w*h; ++i) {
+            unsigned char *pixel = out + 4*i;
+            if (pixel[3] != 0 && pixel[3] != 255) {
+               float a = pixel[3] / 255.0f;
+               float ra = 1.0f / a;
+               float inv_a = 255.0f * (1 - ra);
+               pixel[0] = (unsigned char) (pixel[0]*ra + inv_a);
+               pixel[1] = (unsigned char) (pixel[1]*ra + inv_a);
+               pixel[2] = (unsigned char) (pixel[2]*ra + inv_a);
+            }
+         }
+      }
+   }
+
+   // convert to desired output format
+   if (req_comp && req_comp != 4) {
+      if (ri->bits_per_channel == 16)
+         out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, 4, req_comp, w, h);
+      else
+         out = stbi__convert_format(out, 4, req_comp, w, h);
+      if (out == NULL) return out; // stbi__convert_format frees input on failure
+   }
+
+   if (comp) *comp = 4;
+   *y = h;
+   *x = w;
+
+   return out;
+}
+#endif
+
+// *************************************************************************************************
+// Softimage PIC loader
+// by Tom Seddon
+//
+// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format
+// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_is4(stbi__context *s,const char *str)
+{
+   int i;
+   for (i=0; i<4; ++i)
+      if (stbi__get8(s) != (stbi_uc)str[i])
+         return 0;
+
+   return 1;
+}
+
+static int stbi__pic_test_core(stbi__context *s)
+{
+   int i;
+
+   if (!stbi__pic_is4(s,"\x53\x80\xF6\x34"))
+      return 0;
+
+   for(i=0;i<84;++i)
+      stbi__get8(s);
+
+   if (!stbi__pic_is4(s,"PICT"))
+      return 0;
+
+   return 1;
+}
+
+typedef struct
+{
+   stbi_uc size,type,channel;
+} stbi__pic_packet;
+
+static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest)
+{
+   int mask=0x80, i;
+
+   for (i=0; i<4; ++i, mask>>=1) {
+      if (channel & mask) {
+         if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short");
+         dest[i]=stbi__get8(s);
+      }
+   }
+
+   return dest;
+}
+
+static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src)
+{
+   int mask=0x80,i;
+
+   for (i=0;i<4; ++i, mask>>=1)
+      if (channel&mask)
+         dest[i]=src[i];
+}
+
+static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, stbi_uc *result)
+{
+   int act_comp=0,num_packets=0,y,chained;
+   stbi__pic_packet packets[10];
+
+   // this will (should...) cater for even some bizarre stuff like having data
+    // for the same channel in multiple packets.
+   do {
+      stbi__pic_packet *packet;
+
+      if (num_packets==sizeof(packets)/sizeof(packets[0]))
+         return stbi__errpuc("bad format","too many packets");
+
+      packet = &packets[num_packets++];
+
+      chained = stbi__get8(s);
+      packet->size    = stbi__get8(s);
+      packet->type    = stbi__get8(s);
+      packet->channel = stbi__get8(s);
+
+      act_comp |= packet->channel;
+
+      if (stbi__at_eof(s))          return stbi__errpuc("bad file","file too short (reading packets)");
+      if (packet->size != 8)  return stbi__errpuc("bad format","packet isn't 8bpp");
+   } while (chained);
+
+   *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel?
+
+   for(y=0; y<height; ++y) {
+      int packet_idx;
+
+      for(packet_idx=0; packet_idx < num_packets; ++packet_idx) {
+         stbi__pic_packet *packet = &packets[packet_idx];
+         stbi_uc *dest = result+y*width*4;
+
+         switch (packet->type) {
+            default:
+               return stbi__errpuc("bad format","packet has bad compression type");
+
+            case 0: {//uncompressed
+               int x;
+
+               for(x=0;x<width;++x, dest+=4)
+                  if (!stbi__readval(s,packet->channel,dest))
+                     return 0;
+               break;
+            }
+
+            case 1://Pure RLE
+               {
+                  int left=width, i;
+
+                  while (left>0) {
+                     stbi_uc count,value[4];
+
+                     count=stbi__get8(s);
+                     if (stbi__at_eof(s))   return stbi__errpuc("bad file","file too short (pure read count)");
+
+                     if (count > left)
+                        count = (stbi_uc) left;
+
+                     if (!stbi__readval(s,packet->channel,value))  return 0;
+
+                     for(i=0; i<count; ++i,dest+=4)
+                        stbi__copyval(packet->channel,dest,value);
+                     left -= count;
+                  }
+               }
+               break;
+
+            case 2: {//Mixed RLE
+               int left=width;
+               while (left>0) {
+                  int count = stbi__get8(s), i;
+                  if (stbi__at_eof(s))  return stbi__errpuc("bad file","file too short (mixed read count)");
+
+                  if (count >= 128) { // Repeated
+                     stbi_uc value[4];
+
+                     if (count==128)
+                        count = stbi__get16be(s);
+                     else
+                        count -= 127;
+                     if (count > left)
+                        return stbi__errpuc("bad file","scanline overrun");
+
+                     if (!stbi__readval(s,packet->channel,value))
+                        return 0;
+
+                     for(i=0;i<count;++i, dest += 4)
+                        stbi__copyval(packet->channel,dest,value);
+                  } else { // Raw
+                     ++count;
+                     if (count>left) return stbi__errpuc("bad file","scanline overrun");
+
+                     for(i=0;i<count;++i, dest+=4)
+                        if (!stbi__readval(s,packet->channel,dest))
+                           return 0;
+                  }
+                  left-=count;
+               }
+               break;
+            }
+         }
+      }
+   }
+
+   return result;
+}
+
+static void *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp, stbi__result_info *ri)
+{
+   stbi_uc *result;
+   int i, x,y, internal_comp;
+   STBI_NOTUSED(ri);
+
+   if (!comp) comp = &internal_comp;
+
+   for (i=0; i<92; ++i)
+      stbi__get8(s);
+
+   x = stbi__get16be(s);
+   y = stbi__get16be(s);
+
+   if (y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
+   if (x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
+
+   if (stbi__at_eof(s))  return stbi__errpuc("bad file","file too short (pic header)");
+   if (!stbi__mad3sizes_valid(x, y, 4, 0)) return stbi__errpuc("too large", "PIC image too large to decode");
+
+   stbi__get32be(s); //skip `ratio'
+   stbi__get16be(s); //skip `fields'
+   stbi__get16be(s); //skip `pad'
+
+   // intermediate buffer is RGBA
+   result = (stbi_uc *) stbi__malloc_mad3(x, y, 4, 0);
+   memset(result, 0xff, x*y*4);
+
+   if (!stbi__pic_load_core(s,x,y,comp, result)) {
+      STBI_FREE(result);
+      result=0;
+   }
+   *px = x;
+   *py = y;
+   if (req_comp == 0) req_comp = *comp;
+   result=stbi__convert_format(result,4,req_comp,x,y);
+
+   return result;
+}
+
+static int stbi__pic_test(stbi__context *s)
+{
+   int r = stbi__pic_test_core(s);
+   stbi__rewind(s);
+   return r;
+}
+#endif
+
+// *************************************************************************************************
+// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb
+
+#ifndef STBI_NO_GIF
+typedef struct
+{
+   stbi__int16 prefix;
+   stbi_uc first;
+   stbi_uc suffix;
+} stbi__gif_lzw;
+
+typedef struct
+{
+   int w,h;
+   stbi_uc *out;                 // output buffer (always 4 components)
+   stbi_uc *background;          // The current "background" as far as a gif is concerned
+   stbi_uc *history;
+   int flags, bgindex, ratio, transparent, eflags;
+   stbi_uc  pal[256][4];
+   stbi_uc lpal[256][4];
+   stbi__gif_lzw codes[8192];
+   stbi_uc *color_table;
+   int parse, step;
+   int lflags;
+   int start_x, start_y;
+   int max_x, max_y;
+   int cur_x, cur_y;
+   int line_size;
+   int delay;
+} stbi__gif;
+
+static int stbi__gif_test_raw(stbi__context *s)
+{
+   int sz;
+   if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0;
+   sz = stbi__get8(s);
+   if (sz != '9' && sz != '7') return 0;
+   if (stbi__get8(s) != 'a') return 0;
+   return 1;
+}
+
+static int stbi__gif_test(stbi__context *s)
+{
+   int r = stbi__gif_test_raw(s);
+   stbi__rewind(s);
+   return r;
+}
+
+static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries, int transp)
+{
+   int i;
+   for (i=0; i < num_entries; ++i) {
+      pal[i][2] = stbi__get8(s);
+      pal[i][1] = stbi__get8(s);
+      pal[i][0] = stbi__get8(s);
+      pal[i][3] = transp == i ? 0 : 255;
+   }
+}
+
+static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info)
+{
+   stbi_uc version;
+   if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8')
+      return stbi__err("not GIF", "Corrupt GIF");
+
+   version = stbi__get8(s);
+   if (version != '7' && version != '9')    return stbi__err("not GIF", "Corrupt GIF");
+   if (stbi__get8(s) != 'a')                return stbi__err("not GIF", "Corrupt GIF");
+
+   stbi__g_failure_reason = "";
+   g->w = stbi__get16le(s);
+   g->h = stbi__get16le(s);
+   g->flags = stbi__get8(s);
+   g->bgindex = stbi__get8(s);
+   g->ratio = stbi__get8(s);
+   g->transparent = -1;
+
+   if (g->w > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)");
+   if (g->h > STBI_MAX_DIMENSIONS) return stbi__err("too large","Very large image (corrupt?)");
+
+   if (comp != 0) *comp = 4;  // can't actually tell whether it's 3 or 4 until we parse the comments
+
+   if (is_info) return 1;
+
+   if (g->flags & 0x80)
+      stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1);
+
+   return 1;
+}
+
+static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp)
+{
+   stbi__gif* g = (stbi__gif*) stbi__malloc(sizeof(stbi__gif));
+   if (!stbi__gif_header(s, g, comp, 1)) {
+      STBI_FREE(g);
+      stbi__rewind( s );
+      return 0;
+   }
+   if (x) *x = g->w;
+   if (y) *y = g->h;
+   STBI_FREE(g);
+   return 1;
+}
+
+static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code)
+{
+   stbi_uc *p, *c;
+   int idx;
+
+   // recurse to decode the prefixes, since the linked-list is backwards,
+   // and working backwards through an interleaved image would be nasty
+   if (g->codes[code].prefix >= 0)
+      stbi__out_gif_code(g, g->codes[code].prefix);
+
+   if (g->cur_y >= g->max_y) return;
+
+   idx = g->cur_x + g->cur_y;
+   p = &g->out[idx];
+   g->history[idx / 4] = 1;
+
+   c = &g->color_table[g->codes[code].suffix * 4];
+   if (c[3] > 128) { // don't render transparent pixels;
+      p[0] = c[2];
+      p[1] = c[1];
+      p[2] = c[0];
+      p[3] = c[3];
+   }
+   g->cur_x += 4;
+
+   if (g->cur_x >= g->max_x) {
+      g->cur_x = g->start_x;
+      g->cur_y += g->step;
+
+      while (g->cur_y >= g->max_y && g->parse > 0) {
+         g->step = (1 << g->parse) * g->line_size;
+         g->cur_y = g->start_y + (g->step >> 1);
+         --g->parse;
+      }
+   }
+}
+
+static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g)
+{
+   stbi_uc lzw_cs;
+   stbi__int32 len, init_code;
+   stbi__uint32 first;
+   stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
+   stbi__gif_lzw *p;
+
+   lzw_cs = stbi__get8(s);
+   if (lzw_cs > 12) return NULL;
+   clear = 1 << lzw_cs;
+   first = 1;
+   codesize = lzw_cs + 1;
+   codemask = (1 << codesize) - 1;
+   bits = 0;
+   valid_bits = 0;
+   for (init_code = 0; init_code < clear; init_code++) {
+      g->codes[init_code].prefix = -1;
+      g->codes[init_code].first = (stbi_uc) init_code;
+      g->codes[init_code].suffix = (stbi_uc) init_code;
+   }
+
+   // support no starting clear code
+   avail = clear+2;
+   oldcode = -1;
+
+   len = 0;
+   for(;;) {
+      if (valid_bits < codesize) {
+         if (len == 0) {
+            len = stbi__get8(s); // start new block
+            if (len == 0)
+               return g->out;
+         }
+         --len;
+         bits |= (stbi__int32) stbi__get8(s) << valid_bits;
+         valid_bits += 8;
+      } else {
+         stbi__int32 code = bits & codemask;
+         bits >>= codesize;
+         valid_bits -= codesize;
+         // @OPTIMIZE: is there some way we can accelerate the non-clear path?
+         if (code == clear) {  // clear code
+            codesize = lzw_cs + 1;
+            codemask = (1 << codesize) - 1;
+            avail = clear + 2;
+            oldcode = -1;
+            first = 0;
+         } else if (code == clear + 1) { // end of stream code
+            stbi__skip(s, len);
+            while ((len = stbi__get8(s)) > 0)
+               stbi__skip(s,len);
+            return g->out;
+         } else if (code <= avail) {
+            if (first) {
+               return stbi__errpuc("no clear code", "Corrupt GIF");
+            }
+
+            if (oldcode >= 0) {
+               p = &g->codes[avail++];
+               if (avail > 8192) {
+                  return stbi__errpuc("too many codes", "Corrupt GIF");
+               }
+
+               p->prefix = (stbi__int16) oldcode;
+               p->first = g->codes[oldcode].first;
+               p->suffix = (code == avail) ? p->first : g->codes[code].first;
+            } else if (code == avail)
+               return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+
+            stbi__out_gif_code(g, (stbi__uint16) code);
+
+            if ((avail & codemask) == 0 && avail <= 0x0FFF) {
+               codesize++;
+               codemask = (1 << codesize) - 1;
+            }
+
+            oldcode = code;
+         } else {
+            return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+         }
+      }
+   }
+}
+
+// this function is designed to support animated gifs, although stb_image doesn't support it
+// two back is the image from two frames ago, used for a very specific disposal format
+static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp, stbi_uc *two_back)
+{
+   int dispose;
+   int first_frame;
+   int pi;
+   int pcount;
+   STBI_NOTUSED(req_comp);
+
+   // on first frame, any non-written pixels get the background colour (non-transparent)
+   first_frame = 0;
+   if (g->out == 0) {
+      if (!stbi__gif_header(s, g, comp,0)) return 0; // stbi__g_failure_reason set by stbi__gif_header
+      if (!stbi__mad3sizes_valid(4, g->w, g->h, 0))
+         return stbi__errpuc("too large", "GIF image is too large");
+      pcount = g->w * g->h;
+      g->out = (stbi_uc *) stbi__malloc(4 * pcount);
+      g->background = (stbi_uc *) stbi__malloc(4 * pcount);
+      g->history = (stbi_uc *) stbi__malloc(pcount);
+      if (!g->out || !g->background || !g->history)
+         return stbi__errpuc("outofmem", "Out of memory");
+
+      // image is treated as "transparent" at the start - ie, nothing overwrites the current background;
+      // background colour is only used for pixels that are not rendered first frame, after that "background"
+      // color refers to the color that was there the previous frame.
+      memset(g->out, 0x00, 4 * pcount);
+      memset(g->background, 0x00, 4 * pcount); // state of the background (starts transparent)
+      memset(g->history, 0x00, pcount);        // pixels that were affected previous frame
+      first_frame = 1;
+   } else {
+      // second frame - how do we dispose of the previous one?
+      dispose = (g->eflags & 0x1C) >> 2;
+      pcount = g->w * g->h;
+
+      if ((dispose == 3) && (two_back == 0)) {
+         dispose = 2; // if I don't have an image to revert back to, default to the old background
+      }
+
+      if (dispose == 3) { // use previous graphic
+         for (pi = 0; pi < pcount; ++pi) {
+            if (g->history[pi]) {
+               memcpy( &g->out[pi * 4], &two_back[pi * 4], 4 );
+            }
+         }
+      } else if (dispose == 2) {
+         // restore what was changed last frame to background before that frame;
+         for (pi = 0; pi < pcount; ++pi) {
+            if (g->history[pi]) {
+               memcpy( &g->out[pi * 4], &g->background[pi * 4], 4 );
+            }
+         }
+      } else {
+         // This is a non-disposal case eithe way, so just
+         // leave the pixels as is, and they will become the new background
+         // 1: do not dispose
+         // 0:  not specified.
+      }
+
+      // background is what out is after the undoing of the previou frame;
+      memcpy( g->background, g->out, 4 * g->w * g->h );
+   }
+
+   // clear my history;
+   memset( g->history, 0x00, g->w * g->h );        // pixels that were affected previous frame
+
+   for (;;) {
+      int tag = stbi__get8(s);
+      switch (tag) {
+         case 0x2C: /* Image Descriptor */
+         {
+            stbi__int32 x, y, w, h;
+            stbi_uc *o;
+
+            x = stbi__get16le(s);
+            y = stbi__get16le(s);
+            w = stbi__get16le(s);
+            h = stbi__get16le(s);
+            if (((x + w) > (g->w)) || ((y + h) > (g->h)))
+               return stbi__errpuc("bad Image Descriptor", "Corrupt GIF");
+
+            g->line_size = g->w * 4;
+            g->start_x = x * 4;
+            g->start_y = y * g->line_size;
+            g->max_x   = g->start_x + w * 4;
+            g->max_y   = g->start_y + h * g->line_size;
+            g->cur_x   = g->start_x;
+            g->cur_y   = g->start_y;
+
+            // if the width of the specified rectangle is 0, that means
+            // we may not see *any* pixels or the image is malformed;
+            // to make sure this is caught, move the current y down to
+            // max_y (which is what out_gif_code checks).
+            if (w == 0)
+               g->cur_y = g->max_y;
+
+            g->lflags = stbi__get8(s);
+
+            if (g->lflags & 0x40) {
+               g->step = 8 * g->line_size; // first interlaced spacing
+               g->parse = 3;
+            } else {
+               g->step = g->line_size;
+               g->parse = 0;
+            }
+
+            if (g->lflags & 0x80) {
+               stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1);
+               g->color_table = (stbi_uc *) g->lpal;
+            } else if (g->flags & 0x80) {
+               g->color_table = (stbi_uc *) g->pal;
+            } else
+               return stbi__errpuc("missing color table", "Corrupt GIF");
+
+            o = stbi__process_gif_raster(s, g);
+            if (!o) return NULL;
+
+            // if this was the first frame,
+            pcount = g->w * g->h;
+            if (first_frame && (g->bgindex > 0)) {
+               // if first frame, any pixel not drawn to gets the background color
+               for (pi = 0; pi < pcount; ++pi) {
+                  if (g->history[pi] == 0) {
+                     g->pal[g->bgindex][3] = 255; // just in case it was made transparent, undo that; It will be reset next frame if need be;
+                     memcpy( &g->out[pi * 4], &g->pal[g->bgindex], 4 );
+                  }
+               }
+            }
+
+            return o;
+         }
+
+         case 0x21: // Comment Extension.
+         {
+            int len;
+            int ext = stbi__get8(s);
+            if (ext == 0xF9) { // Graphic Control Extension.
+               len = stbi__get8(s);
+               if (len == 4) {
+                  g->eflags = stbi__get8(s);
+                  g->delay = 10 * stbi__get16le(s); // delay - 1/100th of a second, saving as 1/1000ths.
+
+                  // unset old transparent
+                  if (g->transparent >= 0) {
+                     g->pal[g->transparent][3] = 255;
+                  }
+                  if (g->eflags & 0x01) {
+                     g->transparent = stbi__get8(s);
+                     if (g->transparent >= 0) {
+                        g->pal[g->transparent][3] = 0;
+                     }
+                  } else {
+                     // don't need transparent
+                     stbi__skip(s, 1);
+                     g->transparent = -1;
+                  }
+               } else {
+                  stbi__skip(s, len);
+                  break;
+               }
+            }
+            while ((len = stbi__get8(s)) != 0) {
+               stbi__skip(s, len);
+            }
+            break;
+         }
+
+         case 0x3B: // gif stream termination code
+            return (stbi_uc *) s; // using '1' causes warning on some compilers
+
+         default:
+            return stbi__errpuc("unknown code", "Corrupt GIF");
+      }
+   }
+}
+
+static void *stbi__load_gif_main(stbi__context *s, int **delays, int *x, int *y, int *z, int *comp, int req_comp)
+{
+   if (stbi__gif_test(s)) {
+      int layers = 0;
+      stbi_uc *u = 0;
+      stbi_uc *out = 0;
+      stbi_uc *two_back = 0;
+      stbi__gif g;
+      int stride;
+      int out_size = 0;
+      int delays_size = 0;
+      memset(&g, 0, sizeof(g));
+      if (delays) {
+         *delays = 0;
+      }
+
+      do {
+         u = stbi__gif_load_next(s, &g, comp, req_comp, two_back);
+         if (u == (stbi_uc *) s) u = 0;  // end of animated gif marker
+
+         if (u) {
+            *x = g.w;
+            *y = g.h;
+            ++layers;
+            stride = g.w * g.h * 4;
+
+            if (out) {
+               void *tmp = (stbi_uc*) STBI_REALLOC_SIZED( out, out_size, layers * stride );
+               if (NULL == tmp) {
+                  STBI_FREE(g.out);
+                  STBI_FREE(g.history);
+                  STBI_FREE(g.background);
+                  return stbi__errpuc("outofmem", "Out of memory");
+               }
+               else {
+                   out = (stbi_uc*) tmp;
+                   out_size = layers * stride;
+               }
+
+               if (delays) {
+                  *delays = (int*) STBI_REALLOC_SIZED( *delays, delays_size, sizeof(int) * layers );
+                  delays_size = layers * sizeof(int);
+               }
+            } else {
+               out = (stbi_uc*)stbi__malloc( layers * stride );
+               out_size = layers * stride;
+               if (delays) {
+                  *delays = (int*) stbi__malloc( layers * sizeof(int) );
+                  delays_size = layers * sizeof(int);
+               }
+            }
+            memcpy( out + ((layers - 1) * stride), u, stride );
+            if (layers >= 2) {
+               two_back = out - 2 * stride;
+            }
+
+            if (delays) {
+               (*delays)[layers - 1U] = g.delay;
+            }
+         }
+      } while (u != 0);
+
+      // free temp buffer;
+      STBI_FREE(g.out);
+      STBI_FREE(g.history);
+      STBI_FREE(g.background);
+
+      // do the final conversion after loading everything;
+      if (req_comp && req_comp != 4)
+         out = stbi__convert_format(out, 4, req_comp, layers * g.w, g.h);
+
+      *z = layers;
+      return out;
+   } else {
+      return stbi__errpuc("not GIF", "Image was not as a gif type.");
+   }
+}
+
+static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   stbi_uc *u = 0;
+   stbi__gif g;
+   memset(&g, 0, sizeof(g));
+   STBI_NOTUSED(ri);
+
+   u = stbi__gif_load_next(s, &g, comp, req_comp, 0);
+   if (u == (stbi_uc *) s) u = 0;  // end of animated gif marker
+   if (u) {
+      *x = g.w;
+      *y = g.h;
+
+      // moved conversion to after successful load so that the same
+      // can be done for multiple frames.
+      if (req_comp && req_comp != 4)
+         u = stbi__convert_format(u, 4, req_comp, g.w, g.h);
+   } else if (g.out) {
+      // if there was an error and we allocated an image buffer, free it!
+      STBI_FREE(g.out);
+   }
+
+   // free buffers needed for multiple frame loading;
+   STBI_FREE(g.history);
+   STBI_FREE(g.background);
+
+   return u;
+}
+
+static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   return stbi__gif_info_raw(s,x,y,comp);
+}
+#endif
+
+// *************************************************************************************************
+// Radiance RGBE HDR loader
+// originally by Nicolas Schulz
+#ifndef STBI_NO_HDR
+static int stbi__hdr_test_core(stbi__context *s, const char *signature)
+{
+   int i;
+   for (i=0; signature[i]; ++i)
+      if (stbi__get8(s) != signature[i])
+          return 0;
+   stbi__rewind(s);
+   return 1;
+}
+
+static int stbi__hdr_test(stbi__context* s)
+{
+   int r = stbi__hdr_test_core(s, "#?RADIANCE\n");
+   stbi__rewind(s);
+   if(!r) {
+       r = stbi__hdr_test_core(s, "#?RGBE\n");
+       stbi__rewind(s);
+   }
+   return r;
+}
+
+#define STBI__HDR_BUFLEN  1024
+static char *stbi__hdr_gettoken(stbi__context *z, char *buffer)
+{
+   int len=0;
+   char c = '\0';
+
+   c = (char) stbi__get8(z);
+
+   while (!stbi__at_eof(z) && c != '\n') {
+      buffer[len++] = c;
+      if (len == STBI__HDR_BUFLEN-1) {
+         // flush to end of line
+         while (!stbi__at_eof(z) && stbi__get8(z) != '\n')
+            ;
+         break;
+      }
+      c = (char) stbi__get8(z);
+   }
+
+   buffer[len] = 0;
+   return buffer;
+}
+
+static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp)
+{
+   if ( input[3] != 0 ) {
+      float f1;
+      // Exponent
+      f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8));
+      if (req_comp <= 2)
+         output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
+      else {
+         output[0] = input[0] * f1;
+         output[1] = input[1] * f1;
+         output[2] = input[2] * f1;
+      }
+      if (req_comp == 2) output[1] = 1;
+      if (req_comp == 4) output[3] = 1;
+   } else {
+      switch (req_comp) {
+         case 4: output[3] = 1; /* fallthrough */
+         case 3: output[0] = output[1] = output[2] = 0;
+                 break;
+         case 2: output[1] = 1; /* fallthrough */
+         case 1: output[0] = 0;
+                 break;
+      }
+   }
+}
+
+static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   char buffer[STBI__HDR_BUFLEN];
+   char *token;
+   int valid = 0;
+   int width, height;
+   stbi_uc *scanline;
+   float *hdr_data;
+   int len;
+   unsigned char count, value;
+   int i, j, k, c1,c2, z;
+   const char *headerToken;
+   STBI_NOTUSED(ri);
+
+   // Check identifier
+   headerToken = stbi__hdr_gettoken(s,buffer);
+   if (strcmp(headerToken, "#?RADIANCE") != 0 && strcmp(headerToken, "#?RGBE") != 0)
+      return stbi__errpf("not HDR", "Corrupt HDR image");
+
+   // Parse header
+   for(;;) {
+      token = stbi__hdr_gettoken(s,buffer);
+      if (token[0] == 0) break;
+      if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+   }
+
+   if (!valid)    return stbi__errpf("unsupported format", "Unsupported HDR format");
+
+   // Parse width and height
+   // can't use sscanf() if we're not using stdio!
+   token = stbi__hdr_gettoken(s,buffer);
+   if (strncmp(token, "-Y ", 3))  return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+   token += 3;
+   height = (int) strtol(token, &token, 10);
+   while (*token == ' ') ++token;
+   if (strncmp(token, "+X ", 3))  return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+   token += 3;
+   width = (int) strtol(token, NULL, 10);
+
+   if (height > STBI_MAX_DIMENSIONS) return stbi__errpf("too large","Very large image (corrupt?)");
+   if (width > STBI_MAX_DIMENSIONS) return stbi__errpf("too large","Very large image (corrupt?)");
+
+   *x = width;
+   *y = height;
+
+   if (comp) *comp = 3;
+   if (req_comp == 0) req_comp = 3;
+
+   if (!stbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0))
+      return stbi__errpf("too large", "HDR image is too large");
+
+   // Read data
+   hdr_data = (float *) stbi__malloc_mad4(width, height, req_comp, sizeof(float), 0);
+   if (!hdr_data)
+      return stbi__errpf("outofmem", "Out of memory");
+
+   // Load image data
+   // image data is stored as some number of sca
+   if ( width < 8 || width >= 32768) {
+      // Read flat data
+      for (j=0; j < height; ++j) {
+         for (i=0; i < width; ++i) {
+            stbi_uc rgbe[4];
+           main_decode_loop:
+            stbi__getn(s, rgbe, 4);
+            stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp);
+         }
+      }
+   } else {
+      // Read RLE-encoded data
+      scanline = NULL;
+
+      for (j = 0; j < height; ++j) {
+         c1 = stbi__get8(s);
+         c2 = stbi__get8(s);
+         len = stbi__get8(s);
+         if (c1 != 2 || c2 != 2 || (len & 0x80)) {
+            // not run-length encoded, so we have to actually use THIS data as a decoded
+            // pixel (note this can't be a valid pixel--one of RGB must be >= 128)
+            stbi_uc rgbe[4];
+            rgbe[0] = (stbi_uc) c1;
+            rgbe[1] = (stbi_uc) c2;
+            rgbe[2] = (stbi_uc) len;
+            rgbe[3] = (stbi_uc) stbi__get8(s);
+            stbi__hdr_convert(hdr_data, rgbe, req_comp);
+            i = 1;
+            j = 0;
+            STBI_FREE(scanline);
+            goto main_decode_loop; // yes, this makes no sense
+         }
+         len <<= 8;
+         len |= stbi__get8(s);
+         if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); }
+         if (scanline == NULL) {
+            scanline = (stbi_uc *) stbi__malloc_mad2(width, 4, 0);
+            if (!scanline) {
+               STBI_FREE(hdr_data);
+               return stbi__errpf("outofmem", "Out of memory");
+            }
+         }
+
+         for (k = 0; k < 4; ++k) {
+            int nleft;
+            i = 0;
+            while ((nleft = width - i) > 0) {
+               count = stbi__get8(s);
+               if (count > 128) {
+                  // Run
+                  value = stbi__get8(s);
+                  count -= 128;
+                  if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); }
+                  for (z = 0; z < count; ++z)
+                     scanline[i++ * 4 + k] = value;
+               } else {
+                  // Dump
+                  if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); }
+                  for (z = 0; z < count; ++z)
+                     scanline[i++ * 4 + k] = stbi__get8(s);
+               }
+            }
+         }
+         for (i=0; i < width; ++i)
+            stbi__hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp);
+      }
+      if (scanline)
+         STBI_FREE(scanline);
+   }
+
+   return hdr_data;
+}
+
+static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   char buffer[STBI__HDR_BUFLEN];
+   char *token;
+   int valid = 0;
+   int dummy;
+
+   if (!x) x = &dummy;
+   if (!y) y = &dummy;
+   if (!comp) comp = &dummy;
+
+   if (stbi__hdr_test(s) == 0) {
+       stbi__rewind( s );
+       return 0;
+   }
+
+   for(;;) {
+      token = stbi__hdr_gettoken(s,buffer);
+      if (token[0] == 0) break;
+      if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+   }
+
+   if (!valid) {
+       stbi__rewind( s );
+       return 0;
+   }
+   token = stbi__hdr_gettoken(s,buffer);
+   if (strncmp(token, "-Y ", 3)) {
+       stbi__rewind( s );
+       return 0;
+   }
+   token += 3;
+   *y = (int) strtol(token, &token, 10);
+   while (*token == ' ') ++token;
+   if (strncmp(token, "+X ", 3)) {
+       stbi__rewind( s );
+       return 0;
+   }
+   token += 3;
+   *x = (int) strtol(token, NULL, 10);
+   *comp = 3;
+   return 1;
+}
+#endif // STBI_NO_HDR
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   void *p;
+   stbi__bmp_data info;
+
+   info.all_a = 255;
+   p = stbi__bmp_parse_header(s, &info);
+   stbi__rewind( s );
+   if (p == NULL)
+      return 0;
+   if (x) *x = s->img_x;
+   if (y) *y = s->img_y;
+   if (comp) {
+      if (info.bpp == 24 && info.ma == 0xff000000)
+         *comp = 3;
+      else
+         *comp = info.ma ? 4 : 3;
+   }
+   return 1;
+}
+#endif
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   int channelCount, dummy, depth;
+   if (!x) x = &dummy;
+   if (!y) y = &dummy;
+   if (!comp) comp = &dummy;
+   if (stbi__get32be(s) != 0x38425053) {
+       stbi__rewind( s );
+       return 0;
+   }
+   if (stbi__get16be(s) != 1) {
+       stbi__rewind( s );
+       return 0;
+   }
+   stbi__skip(s, 6);
+   channelCount = stbi__get16be(s);
+   if (channelCount < 0 || channelCount > 16) {
+       stbi__rewind( s );
+       return 0;
+   }
+   *y = stbi__get32be(s);
+   *x = stbi__get32be(s);
+   depth = stbi__get16be(s);
+   if (depth != 8 && depth != 16) {
+       stbi__rewind( s );
+       return 0;
+   }
+   if (stbi__get16be(s) != 3) {
+       stbi__rewind( s );
+       return 0;
+   }
+   *comp = 4;
+   return 1;
+}
+
+static int stbi__psd_is16(stbi__context *s)
+{
+   int channelCount, depth;
+   if (stbi__get32be(s) != 0x38425053) {
+       stbi__rewind( s );
+       return 0;
+   }
+   if (stbi__get16be(s) != 1) {
+       stbi__rewind( s );
+       return 0;
+   }
+   stbi__skip(s, 6);
+   channelCount = stbi__get16be(s);
+   if (channelCount < 0 || channelCount > 16) {
+       stbi__rewind( s );
+       return 0;
+   }
+   (void) stbi__get32be(s);
+   (void) stbi__get32be(s);
+   depth = stbi__get16be(s);
+   if (depth != 16) {
+       stbi__rewind( s );
+       return 0;
+   }
+   return 1;
+}
+#endif
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   int act_comp=0,num_packets=0,chained,dummy;
+   stbi__pic_packet packets[10];
+
+   if (!x) x = &dummy;
+   if (!y) y = &dummy;
+   if (!comp) comp = &dummy;
+
+   if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) {
+      stbi__rewind(s);
+      return 0;
+   }
+
+   stbi__skip(s, 88);
+
+   *x = stbi__get16be(s);
+   *y = stbi__get16be(s);
+   if (stbi__at_eof(s)) {
+      stbi__rewind( s);
+      return 0;
+   }
+   if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) {
+      stbi__rewind( s );
+      return 0;
+   }
+
+   stbi__skip(s, 8);
+
+   do {
+      stbi__pic_packet *packet;
+
+      if (num_packets==sizeof(packets)/sizeof(packets[0]))
+         return 0;
+
+      packet = &packets[num_packets++];
+      chained = stbi__get8(s);
+      packet->size    = stbi__get8(s);
+      packet->type    = stbi__get8(s);
+      packet->channel = stbi__get8(s);
+      act_comp |= packet->channel;
+
+      if (stbi__at_eof(s)) {
+          stbi__rewind( s );
+          return 0;
+      }
+      if (packet->size != 8) {
+          stbi__rewind( s );
+          return 0;
+      }
+   } while (chained);
+
+   *comp = (act_comp & 0x10 ? 4 : 3);
+
+   return 1;
+}
+#endif
+
+// *************************************************************************************************
+// Portable Gray Map and Portable Pixel Map loader
+// by Ken Miller
+//
+// PGM: http://netpbm.sourceforge.net/doc/pgm.html
+// PPM: http://netpbm.sourceforge.net/doc/ppm.html
+//
+// Known limitations:
+//    Does not support comments in the header section
+//    Does not support ASCII image data (formats P2 and P3)
+//    Does not support 16-bit-per-channel
+
+#ifndef STBI_NO_PNM
+
+static int      stbi__pnm_test(stbi__context *s)
+{
+   char p, t;
+   p = (char) stbi__get8(s);
+   t = (char) stbi__get8(s);
+   if (p != 'P' || (t != '5' && t != '6')) {
+       stbi__rewind( s );
+       return 0;
+   }
+   return 1;
+}
+
+static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+{
+   stbi_uc *out;
+   STBI_NOTUSED(ri);
+
+   if (!stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n))
+      return 0;
+
+   if (s->img_y > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
+   if (s->img_x > STBI_MAX_DIMENSIONS) return stbi__errpuc("too large","Very large image (corrupt?)");
+
+   *x = s->img_x;
+   *y = s->img_y;
+   if (comp) *comp = s->img_n;
+
+   if (!stbi__mad3sizes_valid(s->img_n, s->img_x, s->img_y, 0))
+      return stbi__errpuc("too large", "PNM too large");
+
+   out = (stbi_uc *) stbi__malloc_mad3(s->img_n, s->img_x, s->img_y, 0);
+   if (!out) return stbi__errpuc("outofmem", "Out of memory");
+   stbi__getn(s, out, s->img_n * s->img_x * s->img_y);
+
+   if (req_comp && req_comp != s->img_n) {
+      out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y);
+      if (out == NULL) return out; // stbi__convert_format frees input on failure
+   }
+   return out;
+}
+
+static int      stbi__pnm_isspace(char c)
+{
+   return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r';
+}
+
+static void     stbi__pnm_skip_whitespace(stbi__context *s, char *c)
+{
+   for (;;) {
+      while (!stbi__at_eof(s) && stbi__pnm_isspace(*c))
+         *c = (char) stbi__get8(s);
+
+      if (stbi__at_eof(s) || *c != '#')
+         break;
+
+      while (!stbi__at_eof(s) && *c != '\n' && *c != '\r' )
+         *c = (char) stbi__get8(s);
+   }
+}
+
+static int      stbi__pnm_isdigit(char c)
+{
+   return c >= '0' && c <= '9';
+}
+
+static int      stbi__pnm_getinteger(stbi__context *s, char *c)
+{
+   int value = 0;
+
+   while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) {
+      value = value*10 + (*c - '0');
+      *c = (char) stbi__get8(s);
+   }
+
+   return value;
+}
+
+static int      stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   int maxv, dummy;
+   char c, p, t;
+
+   if (!x) x = &dummy;
+   if (!y) y = &dummy;
+   if (!comp) comp = &dummy;
+
+   stbi__rewind(s);
+
+   // Get identifier
+   p = (char) stbi__get8(s);
+   t = (char) stbi__get8(s);
+   if (p != 'P' || (t != '5' && t != '6')) {
+       stbi__rewind(s);
+       return 0;
+   }
+
+   *comp = (t == '6') ? 3 : 1;  // '5' is 1-component .pgm; '6' is 3-component .ppm
+
+   c = (char) stbi__get8(s);
+   stbi__pnm_skip_whitespace(s, &c);
+
+   *x = stbi__pnm_getinteger(s, &c); // read width
+   stbi__pnm_skip_whitespace(s, &c);
+
+   *y = stbi__pnm_getinteger(s, &c); // read height
+   stbi__pnm_skip_whitespace(s, &c);
+
+   maxv = stbi__pnm_getinteger(s, &c);  // read max value
+
+   if (maxv > 255)
+      return stbi__err("max value > 255", "PPM image not 8-bit");
+   else
+      return 1;
+}
+#endif
+
+static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp)
+{
+   #ifndef STBI_NO_JPEG
+   if (stbi__jpeg_info(s, x, y, comp)) return 1;
+   #endif
+
+   #ifndef STBI_NO_PNG
+   if (stbi__png_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_GIF
+   if (stbi__gif_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_BMP
+   if (stbi__bmp_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_PSD
+   if (stbi__psd_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_PIC
+   if (stbi__pic_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_PNM
+   if (stbi__pnm_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_HDR
+   if (stbi__hdr_info(s, x, y, comp))  return 1;
+   #endif
+
+   // test tga last because it's a crappy test!
+   #ifndef STBI_NO_TGA
+   if (stbi__tga_info(s, x, y, comp))
+       return 1;
+   #endif
+   return stbi__err("unknown image type", "Image not of any known type, or corrupt");
+}
+
+static int stbi__is_16_main(stbi__context *s)
+{
+   #ifndef STBI_NO_PNG
+   if (stbi__png_is16(s))  return 1;
+   #endif
+
+   #ifndef STBI_NO_PSD
+   if (stbi__psd_is16(s))  return 1;
+   #endif
+
+   return 0;
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp)
+{
+    FILE *f = stbi__fopen(filename, "rb");
+    int result;
+    if (!f) return stbi__err("can't fopen", "Unable to open file");
+    result = stbi_info_from_file(f, x, y, comp);
+    fclose(f);
+    return result;
+}
+
+STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp)
+{
+   int r;
+   stbi__context s;
+   long pos = ftell(f);
+   stbi__start_file(&s, f);
+   r = stbi__info_main(&s,x,y,comp);
+   fseek(f,pos,SEEK_SET);
+   return r;
+}
+
+STBIDEF int stbi_is_16_bit(char const *filename)
+{
+    FILE *f = stbi__fopen(filename, "rb");
+    int result;
+    if (!f) return stbi__err("can't fopen", "Unable to open file");
+    result = stbi_is_16_bit_from_file(f);
+    fclose(f);
+    return result;
+}
+
+STBIDEF int stbi_is_16_bit_from_file(FILE *f)
+{
+   int r;
+   stbi__context s;
+   long pos = ftell(f);
+   stbi__start_file(&s, f);
+   r = stbi__is_16_main(&s);
+   fseek(f,pos,SEEK_SET);
+   return r;
+}
+#endif // !STBI_NO_STDIO
+
+STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__info_main(&s,x,y,comp);
+}
+
+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user);
+   return stbi__info_main(&s,x,y,comp);
+}
+
+STBIDEF int stbi_is_16_bit_from_memory(stbi_uc const *buffer, int len)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__is_16_main(&s);
+}
+
+STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *c, void *user)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user);
+   return stbi__is_16_main(&s);
+}
+
+#endif // STB_IMAGE_IMPLEMENTATION
+
+/*
+   revision history:
+      2.20  (2019-02-07) support utf8 filenames in Windows; fix warnings and platform ifdefs
+      2.19  (2018-02-11) fix warning
+      2.18  (2018-01-30) fix warnings
+      2.17  (2018-01-29) change sbti__shiftsigned to avoid clang -O2 bug
+                         1-bit BMP
+                         *_is_16_bit api
+                         avoid warnings
+      2.16  (2017-07-23) all functions have 16-bit variants;
+                         STBI_NO_STDIO works again;
+                         compilation fixes;
+                         fix rounding in unpremultiply;
+                         optimize vertical flip;
+                         disable raw_len validation;
+                         documentation fixes
+      2.15  (2017-03-18) fix png-1,2,4 bug; now all Imagenet JPGs decode;
+                         warning fixes; disable run-time SSE detection on gcc;
+                         uniform handling of optional "return" values;
+                         thread-safe initialization of zlib tables
+      2.14  (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs
+      2.13  (2016-11-29) add 16-bit API, only supported for PNG right now
+      2.12  (2016-04-02) fix typo in 2.11 PSD fix that caused crashes
+      2.11  (2016-04-02) allocate large structures on the stack
+                         remove white matting for transparent PSD
+                         fix reported channel count for PNG & BMP
+                         re-enable SSE2 in non-gcc 64-bit
+                         support RGB-formatted JPEG
+                         read 16-bit PNGs (only as 8-bit)
+      2.10  (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED
+      2.09  (2016-01-16) allow comments in PNM files
+                         16-bit-per-pixel TGA (not bit-per-component)
+                         info() for TGA could break due to .hdr handling
+                         info() for BMP to shares code instead of sloppy parse
+                         can use STBI_REALLOC_SIZED if allocator doesn't support realloc
+                         code cleanup
+      2.08  (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA
+      2.07  (2015-09-13) fix compiler warnings
+                         partial animated GIF support
+                         limited 16-bpc PSD support
+                         #ifdef unused functions
+                         bug with < 92 byte PIC,PNM,HDR,TGA
+      2.06  (2015-04-19) fix bug where PSD returns wrong '*comp' value
+      2.05  (2015-04-19) fix bug in progressive JPEG handling, fix warning
+      2.04  (2015-04-15) try to re-enable SIMD on MinGW 64-bit
+      2.03  (2015-04-12) extra corruption checking (mmozeiko)
+                         stbi_set_flip_vertically_on_load (nguillemot)
+                         fix NEON support; fix mingw support
+      2.02  (2015-01-19) fix incorrect assert, fix warning
+      2.01  (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2
+      2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG
+      2.00  (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg)
+                         progressive JPEG (stb)
+                         PGM/PPM support (Ken Miller)
+                         STBI_MALLOC,STBI_REALLOC,STBI_FREE
+                         GIF bugfix -- seemingly never worked
+                         STBI_NO_*, STBI_ONLY_*
+      1.48  (2014-12-14) fix incorrectly-named assert()
+      1.47  (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb)
+                         optimize PNG (ryg)
+                         fix bug in interlaced PNG with user-specified channel count (stb)
+      1.46  (2014-08-26)
+              fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG
+      1.45  (2014-08-16)
+              fix MSVC-ARM internal compiler error by wrapping malloc
+      1.44  (2014-08-07)
+              various warning fixes from Ronny Chevalier
+      1.43  (2014-07-15)
+              fix MSVC-only compiler problem in code changed in 1.42
+      1.42  (2014-07-09)
+              don't define _CRT_SECURE_NO_WARNINGS (affects user code)
+              fixes to stbi__cleanup_jpeg path
+              added STBI_ASSERT to avoid requiring assert.h
+      1.41  (2014-06-25)
+              fix search&replace from 1.36 that messed up comments/error messages
+      1.40  (2014-06-22)
+              fix gcc struct-initialization warning
+      1.39  (2014-06-15)
+              fix to TGA optimization when req_comp != number of components in TGA;
+              fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite)
+              add support for BMP version 5 (more ignored fields)
+      1.38  (2014-06-06)
+              suppress MSVC warnings on integer casts truncating values
+              fix accidental rename of 'skip' field of I/O
+      1.37  (2014-06-04)
+              remove duplicate typedef
+      1.36  (2014-06-03)
+              convert to header file single-file library
+              if de-iphone isn't set, load iphone images color-swapped instead of returning NULL
+      1.35  (2014-05-27)
+              various warnings
+              fix broken STBI_SIMD path
+              fix bug where stbi_load_from_file no longer left file pointer in correct place
+              fix broken non-easy path for 32-bit BMP (possibly never used)
+              TGA optimization by Arseny Kapoulkine
+      1.34  (unknown)
+              use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case
+      1.33  (2011-07-14)
+              make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements
+      1.32  (2011-07-13)
+              support for "info" function for all supported filetypes (SpartanJ)
+      1.31  (2011-06-20)
+              a few more leak fixes, bug in PNG handling (SpartanJ)
+      1.30  (2011-06-11)
+              added ability to load files via callbacks to accomidate custom input streams (Ben Wenger)
+              removed deprecated format-specific test/load functions
+              removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway
+              error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha)
+              fix inefficiency in decoding 32-bit BMP (David Woo)
+      1.29  (2010-08-16)
+              various warning fixes from Aurelien Pocheville
+      1.28  (2010-08-01)
+              fix bug in GIF palette transparency (SpartanJ)
+      1.27  (2010-08-01)
+              cast-to-stbi_uc to fix warnings
+      1.26  (2010-07-24)
+              fix bug in file buffering for PNG reported by SpartanJ
+      1.25  (2010-07-17)
+              refix trans_data warning (Won Chun)
+      1.24  (2010-07-12)
+              perf improvements reading from files on platforms with lock-heavy fgetc()
+              minor perf improvements for jpeg
+              deprecated type-specific functions so we'll get feedback if they're needed
+              attempt to fix trans_data warning (Won Chun)
+      1.23    fixed bug in iPhone support
+      1.22  (2010-07-10)
+              removed image *writing* support
+              stbi_info support from Jetro Lauha
+              GIF support from Jean-Marc Lienher
+              iPhone PNG-extensions from James Brown
+              warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva)
+      1.21    fix use of 'stbi_uc' in header (reported by jon blow)
+      1.20    added support for Softimage PIC, by Tom Seddon
+      1.19    bug in interlaced PNG corruption check (found by ryg)
+      1.18  (2008-08-02)
+              fix a threading bug (local mutable static)
+      1.17    support interlaced PNG
+      1.16    major bugfix - stbi__convert_format converted one too many pixels
+      1.15    initialize some fields for thread safety
+      1.14    fix threadsafe conversion bug
+              header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
+      1.13    threadsafe
+      1.12    const qualifiers in the API
+      1.11    Support installable IDCT, colorspace conversion routines
+      1.10    Fixes for 64-bit (don't use "unsigned long")
+              optimized upsampling by Fabian "ryg" Giesen
+      1.09    Fix format-conversion for PSD code (bad global variables!)
+      1.08    Thatcher Ulrich's PSD code integrated by Nicolas Schulz
+      1.07    attempt to fix C++ warning/errors again
+      1.06    attempt to fix C++ warning/errors again
+      1.05    fix TGA loading to return correct *comp and use good luminance calc
+      1.04    default float alpha is 1, not 255; use 'void *' for stbi_image_free
+      1.03    bugfixes to STBI_NO_STDIO, STBI_NO_HDR
+      1.02    support for (subset of) HDR files, float interface for preferred access to them
+      1.01    fix bug: possible bug in handling right-side up bmps... not sure
+              fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all
+      1.00    interface to zlib that skips zlib header
+      0.99    correct handling of alpha in palette
+      0.98    TGA loader by lonesock; dynamically add loaders (untested)
+      0.97    jpeg errors on too large a file; also catch another malloc failure
+      0.96    fix detection of invalid v value - particleman@mollyrocket forum
+      0.95    during header scan, seek to markers in case of padding
+      0.94    STBI_NO_STDIO to disable stdio usage; rename all #defines the same
+      0.93    handle jpegtran output; verbose errors
+      0.92    read 4,8,16,24,32-bit BMP files of several formats
+      0.91    output 24-bit Windows 3.0 BMP files
+      0.90    fix a few more warnings; bump version number to approach 1.0
+      0.61    bugfixes due to Marc LeBlanc, Christopher Lloyd
+      0.60    fix compiling as c++
+      0.59    fix warnings: merge Dave Moore's -Wall fixes
+      0.58    fix bug: zlib uncompressed mode len/nlen was wrong endian
+      0.57    fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available
+      0.56    fix bug: zlib uncompressed mode len vs. nlen
+      0.55    fix bug: restart_interval not initialized to 0
+      0.54    allow NULL for 'int *comp'
+      0.53    fix bug in png 3->4; speedup png decoding
+      0.52    png handles req_comp=3,4 directly; minor cleanup; jpeg comments
+      0.51    obey req_comp requests, 1-component jpegs return as 1-component,
+              on 'test' only check type, not whether we support this variant
+      0.50  (2006-11-19)
+              first released version
+*/
+
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/