Implement Texture Atlases

assets.cpp

@@ -13,16 +13,32 @@ static constexpr uint8_t FRUITS_DATA[] = {
 #embed "fruits.jpg"
 };
 
-void init_assets(flecs::world &world) {
-  auto *renderer = world.get<SdlHandles>()->renderer;
-
-  auto *background_iostream =
-      SDL_IOFromConstMem(BACKGROUND_DATA, sizeof(BACKGROUND_DATA));
-  SDL_Texture *background =
-      IMG_LoadTexture_IO(renderer, background_iostream, false);
-  if (background == nullptr) {
+SDL_Texture *load_texture(uint8_t const *data, size_t size,
+                          SDL_Renderer *renderer) {
+  auto *iostream = SDL_IOFromConstMem(data, size);
+  SDL_Texture *texture = IMG_LoadTexture_IO(renderer, iostream, false);
+  if (texture == nullptr) {
     spdlog::error("Failed to load SDL texture!\nCause: {}", SDL_GetError());
   }
 
-  world.set<SpriteAssets>(SpriteAssets{.background = background});
+  return texture;
+}
+
+void init_assets(flecs::world &world) {
+  auto *renderer = world.get<SdlHandles>()->renderer;
+
+  auto *background =
+      load_texture(BACKGROUND_DATA, sizeof(BACKGROUND_DATA), renderer);
+  TextureAtlasLayout background_layout = {
+      .width = 866, .height = 510, .rows = 1, .columns = 1};
+
+  auto *fruits = load_texture(FRUITS_DATA, sizeof(FRUITS_DATA), renderer);
+  TextureAtlasLayout fruits_layout = {
+      .width = 16, .height = 16, .rows = 6, .columns = 38};
+
+  world.set<TextureAssets>(TextureAssets{
+      .background = Texture{.sdl_texture = background,
+                            .texture_atlas_layout = background_layout},
+      .fruits = Texture{.sdl_texture = fruits,
+                        .texture_atlas_layout = fruits_layout}});
 }