6 files changed, 114 insertions, 304 deletions

diff --git a/src/llr/light.c b/src/llr/light.c
index 168f16a..1d1c40d 100644
--- a/src/llr/light.c
+++ b/src/llr/light.c
@@ -1,4 +1,4 @@
-#include "../scene/light_impl.h"
+#include "light_impl.h"
 
 #include "../scene/node_impl.h"
 #include "../scene/scene_memory.h"
diff --git a/src/llr/llr.c b/src/llr/llr.c
index 62a7c30..74cfaed 100644
--- a/src/llr/llr.c
+++ b/src/llr/llr.c
@@ -1,17 +1,14 @@
-#include "imm_renderer_impl.h"
 #include "light_impl.h"
+#include "llr_impl.h"
 #include "mesh_impl.h"
 
+#include "llr/material_impl.h"
 #include "scene/animation_impl.h"
 
 #include <gfx/core.h>
 #include <gfx/util/ibl.h>
-#include <gfx/util/shader.h>
-
-#include <math/aabb3.h>
 
 #include <cassert.h>
-#include <string.h> // memcpy
 
 static const int IRRADIANCE_MAP_WIDTH               = 1024;
 static const int IRRADIANCE_MAP_HEIGHT              = 1024;
@@ -21,7 +18,7 @@ static const int BRDF_INTEGRATION_MAP_WIDTH         = 512;
 static const int BRDF_INTEGRATION_MAP_HEIGHT        = 512;
 
 /// Initialize renderer state for IBL.
-static bool init_ibl(ImmRenderer* renderer) {
+static bool init_ibl(LLR* renderer) {
   assert(renderer);
   assert(!renderer->ibl);
   assert(!renderer->brdf_integration_map);
@@ -44,8 +41,7 @@ static bool init_ibl(ImmRenderer* renderer) {
 //
 /// Compute irradiance and prefiltered environment maps for the light if they
 /// have not been already computed.
-static bool set_up_environment_light(
-    ImmRenderer* renderer, EnvironmentLight* light) {
+static bool set_up_environment_light(LLR* renderer, EnvironmentLight* light) {
   assert(renderer);
   assert(light);
   assert(renderer->ibl);
@@ -92,7 +88,7 @@ cleanup:
   return false;
 }
 
-static void configure_light(ImmRenderer* renderer, Light* light) {
+static void configure_light(LLR* renderer, Light* light) {
   assert(renderer);
   assert(light);
 
@@ -127,20 +123,35 @@ static void configure_light(ImmRenderer* renderer, Light* light) {
   }
 }
 
-static void configure_state(ImmRenderer* renderer) {
+static void configure_state(LLR* renderer) {
   assert(renderer);
 
   // Check if anything changed first so that we don't call gfx_apply_uniforms()
   // unnecessarily.
-  const bool anything_changed =
-      renderer->camera_changed || renderer->lights_changed ||
-      renderer->skeleton_changed || renderer->shader_changed;
-  if (!anything_changed) {
+  const bool nothing_changed = (renderer->changed_flags == 0);
+  if (nothing_changed) {
+    return;
+  }
+  // Setting a null shader is also allowed, in which case there is nothing to
+  // configure.
+  if (renderer->shader == 0) {
+    renderer->shader_changed = false;
     return;
   }
 
   // For convenience.
   ShaderProgram* const shader = renderer->shader;
+  const mat4* const    model = &renderer->matrix_stack[renderer->stack_pointer];
+
+  // TODO: Check to see which ones the shader actually uses and avoid
+  //  computing the unnecessary matrices.
+
+  if (renderer->matrix_changed || renderer->shader_changed) {
+    renderer->matrix_changed = false;
+
+    gfx_set_mat4_uniform(shader, "Model", model);
+    gfx_set_mat4_uniform(shader, "ModelMatrix", model);
+  }
 
   // TODO: camera_changed is not set anywhere. Need to think how imm primitive
   //  rendering and imm mesh rendering work together. We could treat imm
@@ -150,20 +161,19 @@ static void configure_state(ImmRenderer* renderer) {
 
     // Set all supported camera-related uniforms. Shaders can choose which ones
     // to use.
-    // TODO: Check to see which ones the shader actually uses and avoid
-    //  computing the unnecessary matrices.
-    const mat4* const model = &renderer->matrix_stack[renderer->stack_pointer];
-    const mat4        modelview = mat4_mul(renderer->view, *model);
+    const mat4 modelview = mat4_mul(renderer->view, *model);
     const mat4 view_proj = mat4_mul(renderer->projection, renderer->view);
     const mat4 mvp       = mat4_mul(renderer->projection, modelview);
 
-    gfx_set_mat4_uniform(shader, "ModelMatrix", model);
     gfx_set_mat4_uniform(shader, "Modelview", &modelview);
     gfx_set_mat4_uniform(shader, "View", &renderer->view);
     gfx_set_mat4_uniform(shader, "Projection", &renderer->projection);
     gfx_set_mat4_uniform(shader, "ViewProjection", &view_proj);
     gfx_set_mat4_uniform(shader, "MVP", &mvp);
     gfx_set_vec3_uniform(shader, "CameraPosition", renderer->camera_position);
+    gfx_set_mat4_uniform(shader, "CameraRotation", &renderer->camera_rotation);
+    gfx_set_float_uniform(shader, "Fovy", renderer->fovy);
+    gfx_set_float_uniform(shader, "Aspect", renderer->aspect);
   }
 
   if (renderer->lights_changed || renderer->shader_changed) {
@@ -181,9 +191,11 @@ static void configure_state(ImmRenderer* renderer) {
   if (renderer->skeleton_changed || renderer->shader_changed) {
     renderer->skeleton_changed = false;
 
-    gfx_set_mat4_array_uniform(
-        shader, "JointMatrices", renderer->joint_matrices,
-        renderer->num_joints);
+    if (renderer->num_joints > 0) {
+      gfx_set_mat4_array_uniform(
+          shader, "JointMatrices", renderer->joint_matrices,
+          renderer->num_joints);
+    }
   }
 
   if (renderer->shader_changed) {
@@ -195,58 +207,29 @@ static void configure_state(ImmRenderer* renderer) {
   gfx_apply_uniforms(renderer->shader);
 }
 
-bool gfx_imm_make(ImmRenderer* renderer, GfxCore* gfxcore) {
+bool gfx_llr_make(LLR* renderer, GfxCore* gfxcore) {
   assert(renderer);
   assert(gfxcore);
 
-  const size_t num_triangle_verts = IMM_MAX_NUM_TRIANGLES * 3;
-
   renderer->gfxcore = gfxcore;
-
-  renderer->triangles = gfx_make_geometry(
-      gfxcore,
-      &(GeometryDesc){.type         = Triangles,
-                      .buffer_usage = BufferDynamic,
-                      .num_verts    = num_triangle_verts,
-                      .positions3d  = (BufferView3d){
-                           .size_bytes = num_triangle_verts * sizeof(vec3)}});
-  if (!renderer->triangles) {
-    goto cleanup;
-  }
-
-  renderer->imm_shader = gfx_make_immediate_mode_shader(gfxcore);
-  if (!renderer->imm_shader) {
-    goto cleanup;
-  }
-  renderer->shader = renderer->imm_shader;
-
   if (!init_ibl(renderer)) {
     goto cleanup;
   }
-
-  gfx_imm_load_identity(renderer);
-  gfx_imm_set_colour(renderer, vec4_make(0.0f, 0.0f, 0.0f, 1.0f));
-
+  gfx_llr_load_identity(renderer);
+  renderer->view            = mat4_id();
+  renderer->projection      = mat4_id();
+  renderer->camera_rotation = mat4_id();
   return true;
 
 cleanup:
-  gfx_imm_destroy(renderer);
+  gfx_llr_destroy(renderer);
   return false;
 }
 
-void gfx_imm_destroy(ImmRenderer* renderer) {
+void gfx_llr_destroy(LLR* renderer) {
   assert(renderer);
   assert(renderer->gfxcore);
 
-  if (renderer->triangles) {
-    gfx_destroy_geometry(renderer->gfxcore, &renderer->triangles);
-    // TODO: Could also destroy the geometry's buffers here.
-  }
-
-  if (renderer->imm_shader) {
-    gfx_destroy_shader_program(renderer->gfxcore, &renderer->imm_shader);
-  }
-
   if (renderer->brdf_integration_map) {
     gfx_destroy_texture(renderer->gfxcore, &renderer->brdf_integration_map);
   }
@@ -257,43 +240,9 @@ void gfx_imm_destroy(ImmRenderer* renderer) {
   }
 }
 
-void gfx_imm_flush(ImmRenderer* renderer) {
-  assert(renderer);
-
-  if (renderer->num_triangle_verts > 0) {
-    configure_state(renderer);
-
-    gfx_update_geometry(
-        renderer->triangles,
-        &(GeometryDesc){
-            .num_verts   = renderer->num_triangle_verts,
-            .positions3d = (BufferView3d){
-                                          .data       = renderer->triangle_verts,
-                                          .size_bytes = renderer->num_triangle_verts * sizeof(vec3)}
-    });
-
-    gfx_apply_uniforms(renderer->shader);
-    gfx_render_geometry(renderer->triangles);
-
-    renderer->num_triangle_verts = 0;
-  }
-}
-
-void gfx_imm_set_shader(ImmRenderer* renderer, ShaderProgram* shader) {
+void gfx_llr_set_shader(LLR* renderer, ShaderProgram* shader) {
   assert(renderer);
-  assert(shader);
-
-  // TODO: It would probably be best to make the imm renderer work in terms of a
-  //  new LLR renderer. Otherwise we need to constantly flush stuff everywhere
-  //  "just in case". This would still allow the imm to render meshes with
-  //  lighting etc. We just need to create an actual Mesh out of the 'triangles'
-  //  Geometry that imm currently has. The change would greatly simplify the
-  //  implementation of this otherwise coupled LLR-IMM renderer.
-  //  Need to decide where to put the matrix stack manipulation. Might be good
-  //  to move to the LLR. (Currently, manipulating the stack causes an imm
-  //  flush, but that's because we have coupled imm with stack manipulation,
-  //  which the new design seems like would address.)
-  gfx_imm_flush(renderer);
+  // null shader is allowed, so do not assert it.
 
   // It's important to not set shader_changed unnecessarily, since that would
   // re-trigger the setting of uniforms.
@@ -303,36 +252,17 @@ void gfx_imm_set_shader(ImmRenderer* renderer, ShaderProgram* shader) {
   }
 }
 
-void gfx_imm_start(ImmRenderer* renderer) {
-  assert(renderer);
-
-  // Shader uniforms are applied lazily.
-  // TODO: In the event that gfx_activate_shader_program() activates uniforms
-  //  automatically for convenience, call an overload here that doesn't do so.
-  gfx_activate_shader_program(renderer->shader);
-}
-
-void gfx_imm_end(ImmRenderer* renderer) {
-  assert(renderer);
-
-  gfx_imm_flush(renderer);
-  gfx_deactivate_shader_program(renderer->shader);
-
-  // TODO: Should we clear all of the render state here as well? At least set
-  //  the 'changed' variables to false, for example.
-}
-
-void gfx_imm_push_light(ImmRenderer* renderer, Light* light) {
+void gfx_llr_push_light(LLR* renderer, Light* light) {
   assert(renderer);
   assert(light);
   assert(renderer->num_lights >= 0);
-  ASSERT(renderer->num_lights < IMM_MAX_NUM_LIGHTS);
+  ASSERT(renderer->num_lights < GFX_LLR_MAX_NUM_LIGHTS);
 
   renderer->lights[renderer->num_lights++] = light;
   renderer->lights_changed                 = true;
 }
 
-void gfx_imm_pop_light(ImmRenderer* renderer) {
+void gfx_llr_pop_light(LLR* renderer) {
   assert(renderer);
   ASSERT(renderer->num_lights > 0);
 
@@ -340,8 +270,8 @@ void gfx_imm_pop_light(ImmRenderer* renderer) {
   renderer->lights_changed                 = true;
 }
 
-void gfx_imm_set_skeleton(
-    ImmRenderer* renderer, const Anima* anima, const Skeleton* skeleton) {
+void gfx_llr_set_skeleton(
+    LLR* renderer, const Anima* anima, const Skeleton* skeleton) {
   assert(renderer);
   assert(anima);
   assert(skeleton);
@@ -356,150 +286,73 @@ void gfx_imm_set_skeleton(
   renderer->skeleton_changed = true;
 }
 
-void gfx_imm_unset_skeleton(ImmRenderer* renderer) {
+void gfx_llr_clear_skeleton(LLR* renderer) {
   assert(renderer);
 
   renderer->num_joints       = 0;
   renderer->skeleton_changed = true;
 }
 
-void gfx_imm_render_mesh(ImmRenderer* renderer, const Mesh* mesh) {
+void gfx_llr_set_camera(LLR* renderer, const Camera* camera) {
   assert(renderer);
-  assert(mesh);
-  assert(mesh->geometry);
-  assert(mesh->material);
 
-  configure_state(renderer);
-  gfx_render_geometry(mesh->geometry);
-}
-
-void gfx_imm_draw_triangles(
-    ImmRenderer* renderer, const vec3 verts[], size_t num_triangles) {
-  assert(renderer);
-  assert(verts);
-  const size_t new_verts = num_triangles * 3;
-  assert(
-      renderer->num_triangle_verts + new_verts < (IMM_MAX_NUM_TRIANGLES * 3));
-
-  memcpy(
-      renderer->triangle_verts + renderer->num_triangle_verts, verts,
-      new_verts * sizeof(vec3));
-
-  renderer->num_triangle_verts += new_verts;
-}
-
-void gfx_imm_draw_triangle(ImmRenderer* renderer, const vec3 verts[3]) {
-  gfx_imm_draw_triangles(renderer, verts, 1);
+  renderer->camera_position = camera->spatial.p;
+  renderer->camera_rotation =
+      mat4_rotation(spatial3_transform(&camera->spatial));
+  renderer->view       = spatial3_inverse_transform(&camera->spatial);
+  renderer->projection = camera->projection;
+  // Assuming a perspective matrix.
+  renderer->fovy = (R)atan(1.0 / (mat4_at(camera->projection, 1, 1))) * 2;
+  renderer->camera_changed = true;
 }
 
-void gfx_imm_draw_aabb2(ImmRenderer* renderer, aabb2 box) {
+void gfx_llr_set_aspect(LLR* renderer, float aspect) {
   assert(renderer);
 
-  // clang-format off
-  const vec3 verts[4] = {
-      vec3_make(box.min.x, box.min.y, 0),    // 3 ---- 2
-      vec3_make(box.max.x, box.min.y, 0),    // |      |
-      vec3_make(box.max.x, box.max.y, 0),    // |      |
-      vec3_make(box.min.x, box.max.y, 0)};   // 0 ---- 1
-  // clang-format on
-
-#define tri(i0, i1, i2) verts[i0], verts[i1], verts[i2]
-  const vec3 tris[6] = {tri(0, 1, 2), tri(0, 2, 3)};
-#undef tri
-
-  gfx_imm_draw_triangles(renderer, tris, 2);
+  renderer->aspect         = aspect;
+  renderer->camera_changed = true;
 }
 
-void gfx_imm_draw_aabb3(ImmRenderer* renderer, aabb3 box) {
+void gfx_llr_render_geometry(LLR* renderer, const Geometry* geometry) {
   assert(renderer);
+  assert(geometry);
 
-  // clang-format off
-  const vec3 vertices[8] = {
-      vec3_make(box.min.x, box.min.y, box.max.z), //     7 ----- 6
-      vec3_make(box.max.x, box.min.y, box.max.z), //    /       /|
-      vec3_make(box.max.x, box.max.y, box.max.z), //   3 ----- 2 |
-      vec3_make(box.min.x, box.max.y, box.max.z), //   |       | |
-      vec3_make(box.min.x, box.min.y, box.min.z), //   | 4 ----- 5
-      vec3_make(box.max.x, box.min.y, box.min.z), //   |/      |/
-      vec3_make(box.max.x, box.max.y, box.min.z), //   0 ----- 1
-      vec3_make(box.min.x, box.max.y, box.min.z)};
-  // clang-format on
-
-  gfx_imm_draw_box3(renderer, vertices);
-}
-
-void gfx_imm_draw_box3(ImmRenderer* renderer, const vec3 vertices[8]) {
-  assert(renderer);
-  assert(vertices);
-
-  //     7 ----- 6
-  //    /       /|
-  //   3 ----- 2 |
-  //   |       | |
-  //   | 4 ----- 5
-  //   |/      |/
-  //   0 ----- 1
-
-#define tri(i0, i1, i2) vertices[i0], vertices[i1], vertices[i2]
-  const vec3 tris[36] = {
-      // Front.
-      tri(0, 1, 2), tri(0, 2, 3),
-      // Right.
-      tri(1, 5, 6), tri(1, 6, 2),
-      // Back.
-      tri(5, 4, 7), tri(5, 7, 6),
-      // Left.
-      tri(4, 0, 03), tri(4, 3, 7),
-      // Top.
-      tri(3, 2, 6), tri(3, 6, 7),
-      // Bottom.
-      tri(0, 4, 5), tri(0, 5, 1)};
-
-  gfx_imm_draw_triangles(renderer, tris, 12);
+  configure_state(renderer);
+  gfx_render_geometry(geometry);
 }
 
-void gfx_imm_set_colour(ImmRenderer* renderer, vec4 colour) {
+void gfx_llr_render_mesh(LLR* renderer, const Mesh* mesh) {
   assert(renderer);
   assert(renderer->shader);
+  assert(mesh);
+  assert(mesh->geometry);
+  assert(mesh->material);
 
-  gfx_imm_flush(renderer);
-
-  gfx_set_vec4_uniform(renderer->shader, "Colour", colour);
-}
-
-// Load the top of the matrix stack into the shader.
-static void update_shader_model_matrix(ImmRenderer* renderer) {
-  assert(renderer);
-
-  gfx_imm_flush(renderer);
-
-  gfx_set_mat4_uniform(
-      renderer->shader, "Model",
-      &renderer->matrix_stack[renderer->stack_pointer]);
+  gfx_material_activate(renderer->shader, mesh->material);
+  gfx_llr_render_geometry(renderer, mesh->geometry);
 }
 
-void gfx_imm_load_identity(ImmRenderer* renderer) {
+void gfx_llr_load_identity(LLR* renderer) {
   assert(renderer);
 
   renderer->matrix_stack[0] = mat4_id();
   renderer->stack_pointer   = 0;
-  update_shader_model_matrix(renderer);
+  renderer->matrix_changed  = true;
 }
 
-void gfx_imm_push_matrix(ImmRenderer* renderer, const mat4* matrix) {
+void gfx_llr_push_matrix(LLR* renderer, const mat4* matrix) {
   assert(renderer);
   assert(matrix);
   assert(renderer->stack_pointer >= 0);
-  ASSERT(renderer->stack_pointer < IMM_MAX_NUM_MATRICES);
+  ASSERT(renderer->stack_pointer < GFX_LLR_MAX_NUM_MATRICES);
 
   renderer->stack_pointer += 1;
   renderer->matrix_stack[renderer->stack_pointer] =
       mat4_mul(*matrix, renderer->matrix_stack[renderer->stack_pointer - 1]);
-
-  update_shader_model_matrix(renderer);
+  renderer->matrix_changed = true;
 }
 
-void gfx_imm_pop_matrix(ImmRenderer* renderer) {
+void gfx_llr_pop_matrix(LLR* renderer) {
   assert(renderer);
   ASSERT(renderer->stack_pointer > 0);
 
@@ -508,47 +361,21 @@ void gfx_imm_pop_matrix(ImmRenderer* renderer) {
       &renderer->matrix_stack[renderer->stack_pointer], 0,
       sizeof(renderer->matrix_stack[0]));
   renderer->stack_pointer -= 1;
-
-  update_shader_model_matrix(renderer);
+  renderer->matrix_changed = true;
 }
 
-void gfx_imm_translate(ImmRenderer* renderer, vec3 offset) {
+void gfx_llr_translate(LLR* renderer, vec3 offset) {
   assert(renderer);
 
   const mat4 mat = mat4_translate(offset);
-  gfx_imm_push_matrix(renderer, &mat);
+  gfx_llr_push_matrix(renderer, &mat);
 }
 
-void gfx_imm_set_model_matrix(ImmRenderer* renderer, const mat4* model) {
+void gfx_llr_set_model_matrix(LLR* renderer, const mat4* model) {
   assert(renderer);
   assert(model);
 
-  gfx_imm_flush(renderer);
-
   renderer->matrix_stack[0] = *model;
   renderer->stack_pointer   = 0;
-  update_shader_model_matrix(renderer);
-}
-
-void gfx_imm_set_camera(ImmRenderer* renderer, const Camera* camera) {
-  assert(renderer);
-  assert(renderer->shader);
-
-  gfx_imm_flush(renderer);
-
-  const mat4 view = spatial3_inverse_transform(&camera->spatial);
-  // const mat4 view_proj = mat4_mul(camera->projection, view);
-  // gfx_imm_set_view_projection_matrix(renderer, &view_proj);
-  renderer->view           = view;
-  renderer->projection     = camera->projection;
-  renderer->camera_changed = true;
+  renderer->matrix_changed  = true;
 }
-
-// void gfx_imm_set_view_projection_matrix(
-//     ImmRenderer* renderer, const mat4* view_proj) {
-//   assert(renderer);
-//   assert(renderer->shader);
-//
-//   gfx_imm_flush(renderer);
-//   gfx_set_mat4_uniform(renderer->shader, "ViewProjection", view_proj);
-// }
diff --git a/src/llr/llr_impl.h b/src/llr/llr_impl.h
index 5ccabd1..ada2d79 100644
--- a/src/llr/llr_impl.h
+++ b/src/llr/llr_impl.h
@@ -8,6 +8,7 @@
 
 #include <stdbool.h>
 #include <stddef.h>
+#include <stdint.h>
 
 typedef struct Geometry      Geometry;
 typedef struct GfxCore       GfxCore;
@@ -33,67 +34,50 @@ typedef struct Texture       Texture;
 /// Note that the shader program API has its own level of caching as well, so
 /// reconfiguration at the level of the renderer does not result in the
 /// worst-case set of graphics API calls.
-///
-/// Currently, the immediate mode renderer can only draw up to a maximum number
-/// of primitives per frame. It does not adjust this number dynamically. Keeps
-/// things simple while the extra complexity is not needed.
-/// TODO: Flush the buffer when it reaches its maximum size to remove this
-///  constraint.
-typedef struct ImmRenderer {
+typedef struct LLR {
   GfxCore* gfxcore;
 
-  vec3 camera_position;
-  mat4 view;           // Camera view matrix.
-  mat4 projection;     // Camera projection matrix.
-  bool camera_changed; // Whether the camera parameters have changed.
-
-  // -------------------------------------------
-  // Immediate-mode rendering of scene elements.
+  union {
+    struct {
+      bool shader_changed   : 1; // Whether the shader has changed.
+      bool camera_changed   : 1; // Whether the camera parameters have changed.
+      bool lights_changed   : 1; // Whether the lights have changed.
+      bool skeleton_changed : 1; // Whether the skeleton has changed.
+      bool matrix_changed   : 1; // Whether the matrix stack has changed.
+    };
+    uint8_t changed_flags;
+  };
 
   IBL*     ibl;
   Texture* brdf_integration_map;
 
-  ShaderProgram* shader;         // Active shader. Not owned.
-  bool           shader_changed; // Whether the shader has changed.
+  ShaderProgram* shader; // Active shader. Not owned.
+
+  vec3 camera_position;
+  mat4 camera_rotation;
+  mat4 view;       // Camera view matrix.
+  mat4 projection; // Camera projection matrix.
+  R    fovy;       // Camera vertical field of view.
+  R    aspect;     // Aspect ratio.
 
   // Lights are not const because environment lights store lazily-computed
   // irradiance maps.
-  Light* lights[IMM_MAX_NUM_LIGHTS]; // Lights stack.
-  int    num_lights;   // Number of lights enabled at a given point in time. It
-                       // points to one past the top of the stack.
-  bool lights_changed; // Whether the lights have changed.
+  Light* lights[GFX_LLR_MAX_NUM_LIGHTS]; // Lights stack.
+  int    num_lights; // Number of lights enabled at a given point in time. It
+                     // points to one past the top of the stack.
 
-  bool   skeleton_changed;
   size_t num_joints;
   mat4   joint_matrices[GFX_MAX_NUM_JOINTS];
 
-  // ---------------------------------------
-  // Immediate-mode rendering of primitives.
-
-  ShaderProgram* imm_shader; // Immediate-mode shader program for primitives.
-  Geometry*      triangles;
-  size_t         num_triangle_verts; // Number of triangle verts this frame.
-  // TODO: wireframe rendering.
-  struct {
-    bool wireframe : 1;
-  } flags;
-  vec3 triangle_verts[IMM_MAX_NUM_TRIANGLES * 3];
-
-  // -------------
-  // Matrix stack.
-
   // The matrix stack contains pre-multiplied matrices.
   // It is also never empty. The top of the stack is an identity matrix when the
   // stack is "empty" from the user's perspective.
-  mat4 matrix_stack[IMM_MAX_NUM_MATRICES];
+  mat4 matrix_stack[GFX_LLR_MAX_NUM_MATRICES];
   int  stack_pointer; // Points to the top of the stack.
-} ImmRenderer;
+} LLR;
 
 /// Create a new immediate mode renderer.
-bool gfx_imm_make(ImmRenderer*, GfxCore*);
+bool gfx_llr_make(LLR*, GfxCore*);
 
 /// Destroy the immediate mode renderer.
-void gfx_imm_destroy(ImmRenderer*);
-
-/// Flush draw commands.
-void gfx_imm_flush(ImmRenderer*);
+void gfx_llr_destroy(LLR*);
diff --git a/src/llr/material.c b/src/llr/material.c
index 47cb45f..4014482 100644
--- a/src/llr/material.c
+++ b/src/llr/material.c
@@ -48,7 +48,7 @@ static void set_uniform(ShaderProgram* prog, const ShaderUniform* uniform) {
   }
 }
 
-void material_activate(ShaderProgram* shader, const Material* material) {
+void gfx_material_activate(ShaderProgram* shader, const Material* material) {
   assert(material);
   for (int i = 0; i < material->num_uniforms; ++i) {
     const ShaderUniform* uniform = &material->uniforms[i];
diff --git a/src/llr/material_impl.h b/src/llr/material_impl.h
index f27bf4d..138497f 100644
--- a/src/llr/material_impl.h
+++ b/src/llr/material_impl.h
@@ -11,6 +11,5 @@ typedef struct Material {
 
 /// Activate the material.
 ///
-/// This activates the material's shader and configures the shader uniforms that
-/// are specific to the material.
-void material_activate(ShaderProgram* shader, const Material* material);
+/// This configures the shader uniforms that are specific to the material.
+void gfx_material_activate(ShaderProgram* shader, const Material* material);
diff --git a/src/llr/mesh.c b/src/llr/mesh.c
index ae75d8c..3aebb04 100644
--- a/src/llr/mesh.c
+++ b/src/llr/mesh.c
@@ -1,4 +1,4 @@
-#include "../scene/mesh_impl.h"
+#include "mesh_impl.h"
 
 #include "../scene/scene_memory.h"