Add load_asset_from_pack function

src/GameEngine.c

@@ -207,6 +207,10 @@ void remove_object(ObjectID *id) {
 }
 
 AssetID load_asset_from_file(const char *path, AssetType type) {
+  if (!path) {
+    return INVALID_ID;
+  }
+
   return type == ASSET_TYPE_IMAGE
              ? load_asset_to_manager(GameEngine.asset_manager, path, type,
                                      GameEngine.window.renderer, NULL)
@@ -214,6 +218,19 @@ AssetID load_asset_from_file(const char *path, AssetType type) {
                                      NULL);
 }
 
+AssetID load_asset_from_pack(asset_pack_t *pack, const char *filename,
+                             AssetType type) {
+  if (!pack || !filename) {
+    return INVALID_ID;
+  }
+
+  return type == ASSET_TYPE_IMAGE
+             ? load_asset_to_manager(GameEngine.asset_manager, filename, type,
+                                     GameEngine.window.renderer, pack)
+             : load_asset_to_manager(GameEngine.asset_manager, filename, type,
+                                     NULL, pack);
+}
+
 void unload_asset(AssetID *id) {
   if (*id < 0) {
     return;