1 files changed, 761 insertions, 0 deletions

diff --git a/contrib/SDL-3.2.8/test/testgpu_spinning_cube.c b/contrib/SDL-3.2.8/test/testgpu_spinning_cube.c
new file mode 100644
index 0000000..0eeb034
--- /dev/null
+++ b/contrib/SDL-3.2.8/test/testgpu_spinning_cube.c
@@ -0,0 +1,761 @@
+/*
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  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.
+*/
+
+#include <stdlib.h>
+
+#ifdef __EMSCRIPTEN__
+#include <emscripten/emscripten.h>
+#endif
+
+#include <SDL3/SDL_test_common.h>
+#include <SDL3/SDL_gpu.h>
+#include <SDL3/SDL_main.h>
+
+/* Regenerate the shaders with testgpu/build-shaders.sh */
+#include "testgpu/testgpu_spirv.h"
+#include "testgpu/testgpu_dxil.h"
+#include "testgpu/testgpu_metallib.h"
+
+#define TESTGPU_SUPPORTED_FORMATS (SDL_GPU_SHADERFORMAT_SPIRV | SDL_GPU_SHADERFORMAT_DXBC | SDL_GPU_SHADERFORMAT_DXIL | SDL_GPU_SHADERFORMAT_METALLIB)
+
+#define CHECK_CREATE(var, thing) { if (!(var)) { SDL_Log("Failed to create %s: %s", thing, SDL_GetError()); quit(2); } }
+
+static Uint32 frames = 0;
+
+typedef struct RenderState
+{
+    SDL_GPUBuffer *buf_vertex;
+    SDL_GPUGraphicsPipeline *pipeline;
+    SDL_GPUSampleCount sample_count;
+} RenderState;
+
+typedef struct WindowState
+{
+    int angle_x, angle_y, angle_z;
+    SDL_GPUTexture *tex_depth, *tex_msaa, *tex_resolve;
+    Uint32 prev_drawablew, prev_drawableh;
+} WindowState;
+
+static SDL_GPUDevice *gpu_device = NULL;
+static RenderState render_state;
+static SDLTest_CommonState *state = NULL;
+static WindowState *window_states = NULL;
+
+static void shutdownGPU(void)
+{
+    if (window_states) {
+        int i;
+        for (i = 0; i < state->num_windows; i++) {
+            WindowState *winstate = &window_states[i];
+            SDL_ReleaseGPUTexture(gpu_device, winstate->tex_depth);
+            SDL_ReleaseGPUTexture(gpu_device, winstate->tex_msaa);
+            SDL_ReleaseGPUTexture(gpu_device, winstate->tex_resolve);
+            SDL_ReleaseWindowFromGPUDevice(gpu_device, state->windows[i]);
+        }
+        SDL_free(window_states);
+        window_states = NULL;
+    }
+
+    SDL_ReleaseGPUBuffer(gpu_device, render_state.buf_vertex);
+    SDL_ReleaseGPUGraphicsPipeline(gpu_device, render_state.pipeline);
+    SDL_DestroyGPUDevice(gpu_device);
+
+    SDL_zero(render_state);
+    gpu_device = NULL;
+}
+
+
+/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
+static void
+quit(int rc)
+{
+    shutdownGPU();
+    SDLTest_CommonQuit(state);
+    exit(rc);
+}
+
+/*
+ * Simulates desktop's glRotatef. The matrix is returned in column-major
+ * order.
+ */
+static void
+rotate_matrix(float angle, float x, float y, float z, float *r)
+{
+    float radians, c, s, c1, u[3], length;
+    int i, j;
+
+    radians = angle * SDL_PI_F / 180.0f;
+
+    c = SDL_cosf(radians);
+    s = SDL_sinf(radians);
+
+    c1 = 1.0f - SDL_cosf(radians);
+
+    length = (float)SDL_sqrt(x * x + y * y + z * z);
+
+    u[0] = x / length;
+    u[1] = y / length;
+    u[2] = z / length;
+
+    for (i = 0; i < 16; i++) {
+        r[i] = 0.0;
+    }
+
+    r[15] = 1.0;
+
+    for (i = 0; i < 3; i++) {
+        r[i * 4 + (i + 1) % 3] = u[(i + 2) % 3] * s;
+        r[i * 4 + (i + 2) % 3] = -u[(i + 1) % 3] * s;
+    }
+
+    for (i = 0; i < 3; i++) {
+        for (j = 0; j < 3; j++) {
+            r[i * 4 + j] += c1 * u[i] * u[j] + (i == j ? c : 0.0f);
+        }
+    }
+}
+
+/*
+ * Simulates gluPerspectiveMatrix
+ */
+static void
+perspective_matrix(float fovy, float aspect, float znear, float zfar, float *r)
+{
+    int i;
+    float f;
+
+    f = 1.0f/SDL_tanf(fovy * 0.5f);
+
+    for (i = 0; i < 16; i++) {
+        r[i] = 0.0;
+    }
+
+    r[0] = f / aspect;
+    r[5] = f;
+    r[10] = (znear + zfar) / (znear - zfar);
+    r[11] = -1.0f;
+    r[14] = (2.0f * znear * zfar) / (znear - zfar);
+    r[15] = 0.0f;
+}
+
+/*
+ * Multiplies lhs by rhs and writes out to r. All matrices are 4x4 and column
+ * major. In-place multiplication is supported.
+ */
+static void
+multiply_matrix(const float *lhs, const float *rhs, float *r)
+{
+    int i, j, k;
+    float tmp[16];
+
+    for (i = 0; i < 4; i++) {
+        for (j = 0; j < 4; j++) {
+            tmp[j * 4 + i] = 0.0;
+
+            for (k = 0; k < 4; k++) {
+                tmp[j * 4 + i] += lhs[k * 4 + i] * rhs[j * 4 + k];
+            }
+        }
+    }
+
+    for (i = 0; i < 16; i++) {
+        r[i] = tmp[i];
+    }
+}
+
+typedef struct VertexData
+{
+    float x, y, z; /* 3D data. Vertex range -0.5..0.5 in all axes. Z -0.5 is near, 0.5 is far. */
+    float red, green, blue;  /* intensity 0 to 1 (alpha is always 1). */
+} VertexData;
+
+static const VertexData vertex_data[] = {
+    /* Front face. */
+    /* Bottom left */
+    { -0.5,  0.5, -0.5, 1.0, 0.0, 0.0 }, /* red */
+    {  0.5, -0.5, -0.5, 0.0, 0.0, 1.0 }, /* blue */
+    { -0.5, -0.5, -0.5, 0.0, 1.0, 0.0 }, /* green */
+
+    /* Top right */
+    { -0.5, 0.5, -0.5, 1.0, 0.0, 0.0 }, /* red */
+    { 0.5,  0.5, -0.5, 1.0, 1.0, 0.0 }, /* yellow */
+    { 0.5, -0.5, -0.5, 0.0, 0.0, 1.0 }, /* blue */
+
+    /* Left face */
+    /* Bottom left */
+    { -0.5,  0.5,  0.5, 1.0, 1.0, 1.0 }, /* white */
+    { -0.5, -0.5, -0.5, 0.0, 1.0, 0.0 }, /* green */
+    { -0.5, -0.5,  0.5, 0.0, 1.0, 1.0 }, /* cyan */
+
+    /* Top right */
+    { -0.5,  0.5,  0.5, 1.0, 1.0, 1.0 }, /* white */
+    { -0.5,  0.5, -0.5, 1.0, 0.0, 0.0 }, /* red */
+    { -0.5, -0.5, -0.5, 0.0, 1.0, 0.0 }, /* green */
+
+    /* Top face */
+    /* Bottom left */
+    { -0.5, 0.5,  0.5, 1.0, 1.0, 1.0 }, /* white */
+    {  0.5, 0.5, -0.5, 1.0, 1.0, 0.0 }, /* yellow */
+    { -0.5, 0.5, -0.5, 1.0, 0.0, 0.0 }, /* red */
+
+    /* Top right */
+    { -0.5, 0.5,  0.5, 1.0, 1.0, 1.0 }, /* white */
+    {  0.5, 0.5,  0.5, 0.0, 0.0, 0.0 }, /* black */
+    {  0.5, 0.5, -0.5, 1.0, 1.0, 0.0 }, /* yellow */
+
+    /* Right face */
+    /* Bottom left */
+    { 0.5,  0.5, -0.5, 1.0, 1.0, 0.0 }, /* yellow */
+    { 0.5, -0.5,  0.5, 1.0, 0.0, 1.0 }, /* magenta */
+    { 0.5, -0.5, -0.5, 0.0, 0.0, 1.0 }, /* blue */
+
+    /* Top right */
+    { 0.5,  0.5, -0.5, 1.0, 1.0, 0.0 }, /* yellow */
+    { 0.5,  0.5,  0.5, 0.0, 0.0, 0.0 }, /* black */
+    { 0.5, -0.5,  0.5, 1.0, 0.0, 1.0 }, /* magenta */
+
+    /* Back face */
+    /* Bottom left */
+    {  0.5,  0.5, 0.5, 0.0, 0.0, 0.0 }, /* black */
+    { -0.5, -0.5, 0.5, 0.0, 1.0, 1.0 }, /* cyan */
+    {  0.5, -0.5, 0.5, 1.0, 0.0, 1.0 }, /* magenta */
+
+    /* Top right */
+    {  0.5,  0.5,  0.5, 0.0, 0.0, 0.0 }, /* black */
+    { -0.5,  0.5,  0.5, 1.0, 1.0, 1.0 }, /* white */
+    { -0.5, -0.5,  0.5, 0.0, 1.0, 1.0 }, /* cyan */
+
+    /* Bottom face */
+    /* Bottom left */
+    { -0.5, -0.5, -0.5, 0.0, 1.0, 0.0 }, /* green */
+    {  0.5, -0.5,  0.5, 1.0, 0.0, 1.0 }, /* magenta */
+    { -0.5, -0.5,  0.5, 0.0, 1.0, 1.0 }, /* cyan */
+
+    /* Top right */
+    { -0.5, -0.5, -0.5, 0.0, 1.0, 0.0 }, /* green */
+    {  0.5, -0.5, -0.5, 0.0, 0.0, 1.0 }, /* blue */
+    {  0.5, -0.5,  0.5, 1.0, 0.0, 1.0 } /* magenta */
+};
+
+static SDL_GPUTexture*
+CreateDepthTexture(Uint32 drawablew, Uint32 drawableh)
+{
+    SDL_GPUTextureCreateInfo createinfo;
+    SDL_GPUTexture *result;
+
+    createinfo.type = SDL_GPU_TEXTURETYPE_2D;
+    createinfo.format = SDL_GPU_TEXTUREFORMAT_D16_UNORM;
+    createinfo.width = drawablew;
+    createinfo.height = drawableh;
+    createinfo.layer_count_or_depth = 1;
+    createinfo.num_levels = 1;
+    createinfo.sample_count = render_state.sample_count;
+    createinfo.usage = SDL_GPU_TEXTUREUSAGE_DEPTH_STENCIL_TARGET;
+    createinfo.props = 0;
+
+    result = SDL_CreateGPUTexture(gpu_device, &createinfo);
+    CHECK_CREATE(result, "Depth Texture")
+
+    return result;
+}
+
+static SDL_GPUTexture*
+CreateMSAATexture(Uint32 drawablew, Uint32 drawableh)
+{
+    SDL_GPUTextureCreateInfo createinfo;
+    SDL_GPUTexture *result;
+
+    if (render_state.sample_count == SDL_GPU_SAMPLECOUNT_1) {
+        return NULL;
+    }
+
+    createinfo.type = SDL_GPU_TEXTURETYPE_2D;
+    createinfo.format = SDL_GetGPUSwapchainTextureFormat(gpu_device, state->windows[0]);
+    createinfo.width = drawablew;
+    createinfo.height = drawableh;
+    createinfo.layer_count_or_depth = 1;
+    createinfo.num_levels = 1;
+    createinfo.sample_count = render_state.sample_count;
+    createinfo.usage = SDL_GPU_TEXTUREUSAGE_COLOR_TARGET;
+    createinfo.props = 0;
+
+    result = SDL_CreateGPUTexture(gpu_device, &createinfo);
+    CHECK_CREATE(result, "MSAA Texture")
+
+    return result;
+}
+
+static SDL_GPUTexture *
+CreateResolveTexture(Uint32 drawablew, Uint32 drawableh)
+{
+    SDL_GPUTextureCreateInfo createinfo;
+    SDL_GPUTexture *result;
+
+    if (render_state.sample_count == SDL_GPU_SAMPLECOUNT_1) {
+        return NULL;
+    }
+
+    createinfo.type = SDL_GPU_TEXTURETYPE_2D;
+    createinfo.format = SDL_GetGPUSwapchainTextureFormat(gpu_device, state->windows[0]);
+    createinfo.width = drawablew;
+    createinfo.height = drawableh;
+    createinfo.layer_count_or_depth = 1;
+    createinfo.num_levels = 1;
+    createinfo.sample_count = SDL_GPU_SAMPLECOUNT_1;
+    createinfo.usage = SDL_GPU_TEXTUREUSAGE_COLOR_TARGET | SDL_GPU_TEXTUREUSAGE_SAMPLER;
+    createinfo.props = 0;
+
+    result = SDL_CreateGPUTexture(gpu_device, &createinfo);
+    CHECK_CREATE(result, "Resolve Texture")
+
+    return result;
+}
+
+static void
+Render(SDL_Window *window, const int windownum)
+{
+    WindowState *winstate = &window_states[windownum];
+    SDL_GPUTexture *swapchainTexture;
+    SDL_GPUColorTargetInfo color_target;
+    SDL_GPUDepthStencilTargetInfo depth_target;
+    float matrix_rotate[16], matrix_modelview[16], matrix_perspective[16], matrix_final[16];
+    SDL_GPUCommandBuffer *cmd;
+    SDL_GPURenderPass *pass;
+    SDL_GPUBufferBinding vertex_binding;
+    SDL_GPUBlitInfo blit_info;
+    Uint32 drawablew, drawableh;
+
+    /* Acquire the swapchain texture */
+
+    cmd = SDL_AcquireGPUCommandBuffer(gpu_device);
+    if (!cmd) {
+        SDL_Log("Failed to acquire command buffer :%s", SDL_GetError());
+        quit(2);
+    }
+    if (!SDL_WaitAndAcquireGPUSwapchainTexture(cmd, state->windows[windownum], &swapchainTexture, &drawablew, &drawableh)) {
+        SDL_Log("Failed to acquire swapchain texture: %s", SDL_GetError());
+        quit(2);
+    }
+
+    if (swapchainTexture == NULL) {
+        /* Swapchain is unavailable, cancel work */
+        SDL_CancelGPUCommandBuffer(cmd);
+        return;
+    }
+
+    /*
+    * Do some rotation with Euler angles. It is not a fixed axis as
+    * quaternions would be, but the effect is cool.
+    */
+    rotate_matrix((float)winstate->angle_x, 1.0f, 0.0f, 0.0f, matrix_modelview);
+    rotate_matrix((float)winstate->angle_y, 0.0f, 1.0f, 0.0f, matrix_rotate);
+
+    multiply_matrix(matrix_rotate, matrix_modelview, matrix_modelview);
+
+    rotate_matrix((float)winstate->angle_z, 0.0f, 1.0f, 0.0f, matrix_rotate);
+
+    multiply_matrix(matrix_rotate, matrix_modelview, matrix_modelview);
+
+    /* Pull the camera back from the cube */
+    matrix_modelview[14] -= 2.5f;
+
+    perspective_matrix(45.0f, (float)drawablew/drawableh, 0.01f, 100.0f, matrix_perspective);
+    multiply_matrix(matrix_perspective, matrix_modelview, (float*) &matrix_final);
+
+    winstate->angle_x += 3;
+    winstate->angle_y += 2;
+    winstate->angle_z += 1;
+
+    if(winstate->angle_x >= 360) winstate->angle_x -= 360;
+    if(winstate->angle_x < 0) winstate->angle_x += 360;
+    if(winstate->angle_y >= 360) winstate->angle_y -= 360;
+    if(winstate->angle_y < 0) winstate->angle_y += 360;
+    if(winstate->angle_z >= 360) winstate->angle_z -= 360;
+    if(winstate->angle_z < 0) winstate->angle_z += 360;
+
+    /* Resize the depth buffer if the window size changed */
+
+    if (winstate->prev_drawablew != drawablew || winstate->prev_drawableh != drawableh) {
+        SDL_ReleaseGPUTexture(gpu_device, winstate->tex_depth);
+        SDL_ReleaseGPUTexture(gpu_device, winstate->tex_msaa);
+        SDL_ReleaseGPUTexture(gpu_device, winstate->tex_resolve);
+        winstate->tex_depth = CreateDepthTexture(drawablew, drawableh);
+        winstate->tex_msaa = CreateMSAATexture(drawablew, drawableh);
+        winstate->tex_resolve = CreateResolveTexture(drawablew, drawableh);
+    }
+    winstate->prev_drawablew = drawablew;
+    winstate->prev_drawableh = drawableh;
+
+    /* Set up the pass */
+
+    SDL_zero(color_target);
+    color_target.clear_color.a = 1.0f;
+    if (winstate->tex_msaa) {
+        color_target.load_op = SDL_GPU_LOADOP_CLEAR;
+        color_target.store_op = SDL_GPU_STOREOP_RESOLVE;
+        color_target.texture = winstate->tex_msaa;
+        color_target.resolve_texture = winstate->tex_resolve;
+        color_target.cycle = true;
+        color_target.cycle_resolve_texture = true;
+    } else {
+        color_target.load_op = SDL_GPU_LOADOP_CLEAR;
+        color_target.store_op = SDL_GPU_STOREOP_STORE;
+        color_target.texture = swapchainTexture;
+    }
+
+    SDL_zero(depth_target);
+    depth_target.clear_depth = 1.0f;
+    depth_target.load_op = SDL_GPU_LOADOP_CLEAR;
+    depth_target.store_op = SDL_GPU_STOREOP_DONT_CARE;
+    depth_target.stencil_load_op = SDL_GPU_LOADOP_DONT_CARE;
+    depth_target.stencil_store_op = SDL_GPU_STOREOP_DONT_CARE;
+    depth_target.texture = winstate->tex_depth;
+    depth_target.cycle = true;
+
+    /* Set up the bindings */
+
+    vertex_binding.buffer = render_state.buf_vertex;
+    vertex_binding.offset = 0;
+
+    /* Draw the cube! */
+
+    SDL_PushGPUVertexUniformData(cmd, 0, matrix_final, sizeof(matrix_final));
+
+    pass = SDL_BeginGPURenderPass(cmd, &color_target, 1, &depth_target);
+    SDL_BindGPUGraphicsPipeline(pass, render_state.pipeline);
+    SDL_BindGPUVertexBuffers(pass, 0, &vertex_binding, 1);
+    SDL_DrawGPUPrimitives(pass, 36, 1, 0, 0);
+    SDL_EndGPURenderPass(pass);
+
+    /* Blit MSAA resolve target to swapchain, if needed */
+    if (render_state.sample_count > SDL_GPU_SAMPLECOUNT_1) {
+        SDL_zero(blit_info);
+        blit_info.source.texture = winstate->tex_resolve;
+        blit_info.source.w = drawablew;
+        blit_info.source.h = drawableh;
+
+        blit_info.destination.texture = swapchainTexture;
+        blit_info.destination.w = drawablew;
+        blit_info.destination.h = drawableh;
+
+        blit_info.load_op = SDL_GPU_LOADOP_DONT_CARE;
+        blit_info.filter = SDL_GPU_FILTER_LINEAR;
+
+        SDL_BlitGPUTexture(cmd, &blit_info);
+    }
+
+    /* Submit the command buffer! */
+    SDL_SubmitGPUCommandBuffer(cmd);
+
+    ++frames;
+}
+
+static SDL_GPUShader*
+load_shader(bool is_vertex)
+{
+    SDL_GPUShaderCreateInfo createinfo;
+    createinfo.num_samplers = 0;
+    createinfo.num_storage_buffers = 0;
+    createinfo.num_storage_textures = 0;
+    createinfo.num_uniform_buffers = is_vertex ? 1 : 0;
+    createinfo.props = 0;
+
+    SDL_GPUShaderFormat format = SDL_GetGPUShaderFormats(gpu_device);
+    if (format & SDL_GPU_SHADERFORMAT_DXIL) {
+        createinfo.format = SDL_GPU_SHADERFORMAT_DXIL;
+        createinfo.code = is_vertex ? D3D12_CubeVert : D3D12_CubeFrag;
+        createinfo.code_size = is_vertex ? SDL_arraysize(D3D12_CubeVert) : SDL_arraysize(D3D12_CubeFrag);
+        createinfo.entrypoint = is_vertex ? "VSMain" : "PSMain";
+    } else if (format & SDL_GPU_SHADERFORMAT_METALLIB) {
+        createinfo.format = SDL_GPU_SHADERFORMAT_METALLIB;
+        createinfo.code = is_vertex ? cube_vert_metallib : cube_frag_metallib;
+        createinfo.code_size = is_vertex ? cube_vert_metallib_len : cube_frag_metallib_len;
+        createinfo.entrypoint = is_vertex ? "vs_main" : "fs_main";
+    } else {
+        createinfo.format = SDL_GPU_SHADERFORMAT_SPIRV;
+        createinfo.code = is_vertex ? cube_vert_spv : cube_frag_spv;
+        createinfo.code_size = is_vertex ? cube_vert_spv_len : cube_frag_spv_len;
+        createinfo.entrypoint = "main";
+    }
+
+    createinfo.stage = is_vertex ? SDL_GPU_SHADERSTAGE_VERTEX : SDL_GPU_SHADERSTAGE_FRAGMENT;
+    return SDL_CreateGPUShader(gpu_device, &createinfo);
+}
+
+static void
+init_render_state(int msaa)
+{
+    SDL_GPUCommandBuffer *cmd;
+    SDL_GPUTransferBuffer *buf_transfer;
+    void *map;
+    SDL_GPUTransferBufferLocation buf_location;
+    SDL_GPUBufferRegion dst_region;
+    SDL_GPUCopyPass *copy_pass;
+    SDL_GPUBufferCreateInfo buffer_desc;
+    SDL_GPUTransferBufferCreateInfo transfer_buffer_desc;
+    SDL_GPUGraphicsPipelineCreateInfo pipelinedesc;
+    SDL_GPUColorTargetDescription color_target_desc;
+    Uint32 drawablew, drawableh;
+    SDL_GPUVertexAttribute vertex_attributes[2];
+    SDL_GPUVertexBufferDescription vertex_buffer_desc;
+    SDL_GPUShader *vertex_shader;
+    SDL_GPUShader *fragment_shader;
+    int i;
+
+    gpu_device = SDL_CreateGPUDevice(
+        TESTGPU_SUPPORTED_FORMATS,
+        true,
+        state->gpudriver
+    );
+    CHECK_CREATE(gpu_device, "GPU device");
+
+    /* Claim the windows */
+
+    for (i = 0; i < state->num_windows; i++) {
+        SDL_ClaimWindowForGPUDevice(
+            gpu_device,
+            state->windows[i]
+        );
+    }
+
+    /* Create shaders */
+
+    vertex_shader = load_shader(true);
+    CHECK_CREATE(vertex_shader, "Vertex Shader")
+    fragment_shader = load_shader(false);
+    CHECK_CREATE(fragment_shader, "Fragment Shader")
+
+    /* Create buffers */
+
+    buffer_desc.usage = SDL_GPU_BUFFERUSAGE_VERTEX;
+    buffer_desc.size = sizeof(vertex_data);
+    buffer_desc.props = SDL_CreateProperties();
+    SDL_SetStringProperty(buffer_desc.props, SDL_PROP_GPU_BUFFER_CREATE_NAME_STRING, "космонавт");
+    render_state.buf_vertex = SDL_CreateGPUBuffer(
+        gpu_device,
+        &buffer_desc
+    );
+    CHECK_CREATE(render_state.buf_vertex, "Static vertex buffer")
+    SDL_DestroyProperties(buffer_desc.props);
+
+    transfer_buffer_desc.usage = SDL_GPU_TRANSFERBUFFERUSAGE_UPLOAD;
+    transfer_buffer_desc.size = sizeof(vertex_data);
+    transfer_buffer_desc.props = SDL_CreateProperties();
+    SDL_SetStringProperty(transfer_buffer_desc.props, SDL_PROP_GPU_TRANSFERBUFFER_CREATE_NAME_STRING, "Transfer Buffer");
+    buf_transfer = SDL_CreateGPUTransferBuffer(
+        gpu_device,
+        &transfer_buffer_desc
+    );
+    CHECK_CREATE(buf_transfer, "Vertex transfer buffer")
+    SDL_DestroyProperties(transfer_buffer_desc.props);
+
+    /* We just need to upload the static data once. */
+    map = SDL_MapGPUTransferBuffer(gpu_device, buf_transfer, false);
+    SDL_memcpy(map, vertex_data, sizeof(vertex_data));
+    SDL_UnmapGPUTransferBuffer(gpu_device, buf_transfer);
+
+    cmd = SDL_AcquireGPUCommandBuffer(gpu_device);
+    copy_pass = SDL_BeginGPUCopyPass(cmd);
+    buf_location.transfer_buffer = buf_transfer;
+    buf_location.offset = 0;
+    dst_region.buffer = render_state.buf_vertex;
+    dst_region.offset = 0;
+    dst_region.size = sizeof(vertex_data);
+    SDL_UploadToGPUBuffer(copy_pass, &buf_location, &dst_region, false);
+    SDL_EndGPUCopyPass(copy_pass);
+    SDL_SubmitGPUCommandBuffer(cmd);
+
+    SDL_ReleaseGPUTransferBuffer(gpu_device, buf_transfer);
+
+    /* Determine which sample count to use */
+    render_state.sample_count = SDL_GPU_SAMPLECOUNT_1;
+    if (msaa && SDL_GPUTextureSupportsSampleCount(
+        gpu_device,
+        SDL_GetGPUSwapchainTextureFormat(gpu_device, state->windows[0]),
+        SDL_GPU_SAMPLECOUNT_4)) {
+        render_state.sample_count = SDL_GPU_SAMPLECOUNT_4;
+    }
+
+    /* Set up the graphics pipeline */
+
+    SDL_zero(pipelinedesc);
+    SDL_zero(color_target_desc);
+
+    color_target_desc.format = SDL_GetGPUSwapchainTextureFormat(gpu_device, state->windows[0]);
+
+    pipelinedesc.target_info.num_color_targets = 1;
+    pipelinedesc.target_info.color_target_descriptions = &color_target_desc;
+    pipelinedesc.target_info.depth_stencil_format = SDL_GPU_TEXTUREFORMAT_D16_UNORM;
+    pipelinedesc.target_info.has_depth_stencil_target = true;
+
+    pipelinedesc.depth_stencil_state.enable_depth_test = true;
+    pipelinedesc.depth_stencil_state.enable_depth_write = true;
+    pipelinedesc.depth_stencil_state.compare_op = SDL_GPU_COMPAREOP_LESS_OR_EQUAL;
+
+    pipelinedesc.multisample_state.sample_count = render_state.sample_count;
+
+    pipelinedesc.primitive_type = SDL_GPU_PRIMITIVETYPE_TRIANGLELIST;
+
+    pipelinedesc.vertex_shader = vertex_shader;
+    pipelinedesc.fragment_shader = fragment_shader;
+
+    vertex_buffer_desc.slot = 0;
+    vertex_buffer_desc.input_rate = SDL_GPU_VERTEXINPUTRATE_VERTEX;
+    vertex_buffer_desc.instance_step_rate = 0;
+    vertex_buffer_desc.pitch = sizeof(VertexData);
+
+    vertex_attributes[0].buffer_slot = 0;
+    vertex_attributes[0].format = SDL_GPU_VERTEXELEMENTFORMAT_FLOAT3;
+    vertex_attributes[0].location = 0;
+    vertex_attributes[0].offset = 0;
+
+    vertex_attributes[1].buffer_slot = 0;
+    vertex_attributes[1].format = SDL_GPU_VERTEXELEMENTFORMAT_FLOAT3;
+    vertex_attributes[1].location = 1;
+    vertex_attributes[1].offset = sizeof(float) * 3;
+
+    pipelinedesc.vertex_input_state.num_vertex_buffers = 1;
+    pipelinedesc.vertex_input_state.vertex_buffer_descriptions = &vertex_buffer_desc;
+    pipelinedesc.vertex_input_state.num_vertex_attributes = 2;
+    pipelinedesc.vertex_input_state.vertex_attributes = (SDL_GPUVertexAttribute*) &vertex_attributes;
+
+    pipelinedesc.props = 0;
+
+    render_state.pipeline = SDL_CreateGPUGraphicsPipeline(gpu_device, &pipelinedesc);
+    CHECK_CREATE(render_state.pipeline, "Render Pipeline")
+
+    /* These are reference-counted; once the pipeline is created, you don't need to keep these. */
+    SDL_ReleaseGPUShader(gpu_device, vertex_shader);
+    SDL_ReleaseGPUShader(gpu_device, fragment_shader);
+
+    /* Set up per-window state */
+
+    window_states = (WindowState *) SDL_calloc(state->num_windows, sizeof (WindowState));
+    if (!window_states) {
+        SDL_Log("Out of memory!");
+        quit(2);
+    }
+
+    for (i = 0; i < state->num_windows; i++) {
+        WindowState *winstate = &window_states[i];
+
+        /* create a depth texture for the window */
+        SDL_GetWindowSizeInPixels(state->windows[i], (int*) &drawablew, (int*) &drawableh);
+        winstate->tex_depth = CreateDepthTexture(drawablew, drawableh);
+        winstate->tex_msaa = CreateMSAATexture(drawablew, drawableh);
+        winstate->tex_resolve = CreateResolveTexture(drawablew, drawableh);
+
+        /* make each window different */
+        winstate->angle_x = (i * 10) % 360;
+        winstate->angle_y = (i * 20) % 360;
+        winstate->angle_z = (i * 30) % 360;
+    }
+}
+
+static int done = 0;
+
+void loop(void)
+{
+    SDL_Event event;
+    int i;
+
+    /* Check for events */
+    while (SDL_PollEvent(&event) && !done) {
+        SDLTest_CommonEvent(state, &event, &done);
+    }
+    if (!done) {
+        for (i = 0; i < state->num_windows; ++i) {
+            Render(state->windows[i], i);
+        }
+    }
+#ifdef __EMSCRIPTEN__
+    else {
+        emscripten_cancel_main_loop();
+    }
+#endif
+}
+
+int
+main(int argc, char *argv[])
+{
+    int msaa;
+    int i;
+    const SDL_DisplayMode *mode;
+    Uint64 then, now;
+
+    /* Initialize params */
+    msaa = 0;
+
+    /* Initialize test framework */
+    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
+    if (!state) {
+        return 1;
+    }
+    for (i = 1; i < argc;) {
+        int consumed;
+
+        consumed = SDLTest_CommonArg(state, i);
+        if (consumed == 0) {
+            if (SDL_strcasecmp(argv[i], "--msaa") == 0) {
+                ++msaa;
+                consumed = 1;
+            } else {
+                consumed = -1;
+            }
+        }
+        if (consumed < 0) {
+            static const char *options[] = { "[--msaa]", NULL };
+            SDLTest_CommonLogUsage(state, argv[0], options);
+            quit(1);
+        }
+        i += consumed;
+    }
+
+    state->skip_renderer = 1;
+    state->window_flags |= SDL_WINDOW_RESIZABLE;
+
+    if (!SDLTest_CommonInit(state)) {
+        quit(2);
+        return 0;
+    }
+
+    mode = SDL_GetCurrentDisplayMode(SDL_GetDisplayForWindow(state->windows[0]));
+    SDL_Log("Screen bpp: %d", SDL_BITSPERPIXEL(mode->format));
+
+    init_render_state(msaa);
+
+    /* Main render loop */
+    frames = 0;
+    then = SDL_GetTicks();
+    done = 0;
+
+#ifdef __EMSCRIPTEN__
+    emscripten_set_main_loop(loop, 0, 1);
+#else
+    while (!done) {
+        loop();
+    }
+#endif
+
+    /* Print out some timing information */
+    now = SDL_GetTicks();
+    if (now > then) {
+        SDL_Log("%2.2f frames per second",
+               ((double) frames * 1000) / (now - then));
+    }
+#if !defined(__ANDROID__)
+    quit(0);
+#endif
+    return 0;
+}
+
+/* vi: set ts=4 sw=4 expandtab: */