From eea896ce47551bf8116922c126f5d3d1e3733071 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Thu, 5 Feb 2026 19:07:28 -0800
Subject: Gamma-correct textures and output in preparation for lighting

---
 src/main.c | 32 ++++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)

(limited to 'src')

diff --git a/src/main.c b/src/main.c
index 6d7a72d..86ab2ae 100644
--- a/src/main.c
+++ b/src/main.c
@@ -297,6 +297,7 @@ static bool Render(State* state) {
     (sgVec2){1.0, 1.0},
   };
   sgTrianglesIndexed(state->gfx, 3, indices, positions, texcoords);*/
+  sgGammaInv(state->gfx, sgColourBuffer(state->gfx), BufferWidth, BufferHeight);
   sgPresent(state->gfx, WindowDims, window_surface->pixels);
 
   if (!SDL_UpdateWindowSurface(state->window)) {
@@ -324,6 +325,28 @@ static bool Resize(State* state) {
   return true;
 }
 
+static bool LoadTexture(State* state, const char* path) {
+  assert(state);
+  if (state->numTextures >= MaxTextures) {
+    fprintf(stderr, "Cannot load texture. Maximum number of textures loaded\n");
+    return false;
+  }
+  // TODO: This indexing into the textures array assumes that we have loaded a
+  //  single model. Generalize later.
+  sgImage* texture = &state->textures[state->numTextures++];
+  int channels = 0;
+  constexpr int desired_channels = 4;
+  texture->pixels = (sgPixel*)stbi_load(path, &texture->width, &texture->height, &channels, desired_channels);
+  if (!texture->pixels) {
+    fprintf(stderr, "Failed to read texture: [%s]\n", path);
+    return false;
+  }
+  assert(channels == desired_channels);
+  // Gamma-correct for lighting.
+  sgGamma(state->gfx, texture->pixels, texture->width, texture->height);
+  return true;
+}
+
 static bool Initialize(State* state) {
   assert(state);
 
@@ -359,16 +382,9 @@ static bool Initialize(State* state) {
   const ModelMaterial* materials = modelMaterials(state->model);
   for (size_t i = 0; i < state->model->numMaterials; ++i) {
     const ModelMaterial* material = &materials[i];
-    // TODO: When doing lighting, need to gamma-correct here.
-    sgImage* texture = &state->textures[state->numTextures++];
-    int channels = 0;
-    constexpr int desired_channels = 4;
-    texture->pixels = (sgPixel*)stbi_load(material->diffuseTexture, &texture->width, &texture->height, &channels, desired_channels);
-    if (!texture->pixels) {
-      fprintf(stderr, "Failed to read texture: [%s]\n", material->diffuseTexture);
+    if (!LoadTexture(state, material->diffuseTexture)) {
       return false;
     }
-    assert(channels == desired_channels);
   }
 
   Camera* camera    = &state->camera;
-- 
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