From 311e4bebcc75f59e123b80d45f99af9e286e0b67 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Wed, 31 Dec 2025 14:47:12 -0800
Subject: Texturing

---
 src/main.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'src')

diff --git a/src/main.c b/src/main.c
index f1bb893..1f900bc 100644
--- a/src/main.c
+++ b/src/main.c
@@ -9,6 +9,8 @@
 #include <swgfx.h>
 #include <SDL3/SDL.h>
 #include <SDL3/SDL_timer.h>
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb_image.h>
 
 #include <assert.h>
 #include <stdio.h>
@@ -67,6 +69,7 @@ typedef struct State {
   void*            gfx_mem;
   swgfx*           gfx;
   Model*           model;
+  sgTexture_t      texture;
   Camera           camera;
   CameraController camera_controller;
   Uint64           last_tick;
@@ -222,6 +225,7 @@ static bool Render(State* state) {
   sgModelId(state->gfx);
   sgView(state->gfx, SgVec3FromMathVec3(cam->spatial.p), SgVec3FromMathVec3(cam->spatial.f));
   sgPerspective(state->gfx, cam->fovy, cam->aspect, cam->near, cam->far);
+  sgTexture(state->gfx, &state->texture);
   RenderModel(state->gfx, state->model);
   /*sgIdx indices[3] = {0, 1, 2};
   sgVec3 positions[3] = {
@@ -285,6 +289,19 @@ static bool Initialize(State* state) {
     fprintf(stderr, "Failed to load model: [%s]\n", model_path);
     return false;
   }
+  if (state->model->material.diffuseTexture[0] != 0) {
+    // TODO: When doing lighting, need to gamma-correct here.
+    sgTexture_t texture = {0};
+    int channels = 0;
+    constexpr int desired_channels = 4;
+    texture.pixels = (sgPixel*)stbi_load(state->model->material.diffuseTexture, &texture.width, &texture.height, &channels, desired_channels);
+    if (!texture.pixels) {
+      fprintf(stderr, "Failed to read texture: [%s]\n", state->model->material.diffuseTexture);
+      return false;
+    }
+    assert(channels == desired_channels);
+    state->texture = texture;
+  }
 
   Camera* camera    = &state->camera;
   camera->fovy      = Fovy;
@@ -307,6 +324,11 @@ static bool Initialize(State* state) {
 static void Shutdown(State* state) {
   assert(state);
 
+  if (state->texture.pixels) {
+    free(state->texture.pixels);
+    state->texture = (sgTexture_t){0};
+  }
+
   if (state->model) {
     free(state->model);
     state->model = nullptr;
-- 
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