Add tileset loading

src/window/window.cc

@@ -113,6 +113,69 @@ uint64_t Window::load_image(const char *path, bool pixel_art) {
   return id;
 }
 
+std::vector<uint64_t> Window::load_image_set(const char *path, Vec2<float> tile_size, Vec2<float> padding, Vec2<float> offset, bool pixel_art) {
+  SDL_Surface *surface = IMG_Load(path);
+
+  if (!surface) {
+    fprintf(stderr, "Failed to load image set: %s\n", SDL_GetError());
+    return {};
+  }
+
+  std::vector<uint64_t> image_ids;
+
+  int columns = (int)((surface->w - offset.x + padding.x) / (tile_size.x + padding.x));
+  int rows = (int)((surface->h - offset.y + padding.y) / (tile_size.y + padding.y));
+
+  for (int y = 0; y < rows; y++) {
+    for (int x = 0; x < columns; x++) {
+      SDL_Rect src_rect = {
+        (int)(offset.x + x * (tile_size.x + padding.x)),
+        (int)(offset.y + y * (tile_size.y + padding.y)),
+        (int)tile_size.x,
+        (int)tile_size.y
+      };
+
+      SDL_Surface *tile_surface = SDL_CreateSurface(src_rect.w, src_rect.h, SDL_PIXELFORMAT_RGBA8888);
+      SDL_BlitSurface(surface, &src_rect, tile_surface, nullptr);
+
+      SDL_Texture *texture = SDL_CreateTexture(
+        renderer,
+        SDL_PIXELFORMAT_RGBA8888,
+        SDL_TEXTUREACCESS_STREAMING,
+        tile_surface->w,
+        tile_surface->h
+      );
+
+      if (!texture) {
+        fprintf(stderr, "Failed to create texture for tile: %s\n", SDL_GetError());
+        SDL_DestroySurface(tile_surface);
+        continue;
+      }
+
+      SDL_UpdateTexture(
+        texture,
+        nullptr,
+        tile_surface->pixels,
+        tile_surface->pitch
+      );
+
+      if (pixel_art) {
+        SDL_SetTextureScaleMode(texture, SDL_SCALEMODE_NEAREST);
+      }
+
+      Image *img = new Image{texture, {(float)tile_surface->w, (float)tile_surface->h}};
+      uint64_t id = image_pool.acquire(img);
+      image_pool.use(id);
+      image_ids.push_back(id);
+
+      SDL_DestroySurface(tile_surface);
+    }
+  }
+
+  SDL_DestroySurface(surface);
+  return image_ids;
+}
+
 uint64_t Window::create_image(Vec2<float> size, bool pixel_art) {
   SDL_Texture *texture = SDL_CreateTexture(
     renderer,