Implemented load audio and music files as well the basic audio playback

functionality.

src/AssetManager.c

@@ -171,7 +171,16 @@ AssetID load_asset_to_manager(AssetManager *am, const char *path,
 
   AssetID existing_id =
       get_asset_id_from_id_node(am, &(am->hashed_path_ids[hash_index]), path);
+
   if (existing_id != INVALID_ID) {
+    if (am->assets[existing_id].type != type) {
+      // If the user tries to load an asset that is already loaded, but they
+      // try to load it as a type that doesn't match the asset's actual type,
+      // we return an INVALID_ID to ensure that the user doesn't try using the
+      // asset with functions that work on the wrong type
+      return INVALID_ID;
+    }
+
     ++(am->user_counter[existing_id]);
     return existing_id;
   }
@@ -189,16 +198,25 @@ AssetID load_asset_to_manager(AssetManager *am, const char *path,
     asset.data.texture = load_texture(renderer, path);
 
     if (!(asset.data.texture)) {
-      printf("Error loading %s: %s\n", path, SDL_GetError());
       loaded = false;
     }
 
     break;
   case ASSET_TYPE_AUDIO_FX:
-    // TODO (Abdelrahman): Implement loading audio chunks
+    asset.data.chunk = Mix_LoadWAV(path);
+
+    if (!(asset.data.chunk)) {
+      loaded = false;
+    }
+
     break;
   case ASSET_TYPE_MUSIC:
-    // TODO (Abdelrahman): Implement loading music
+    asset.data.music = Mix_LoadMUS(path);
+
+    if (!(asset.data.music)) {
+      loaded = false;
+    }
+
     break;
   default:
     loaded = false;
@@ -206,6 +224,7 @@ AssetID load_asset_to_manager(AssetManager *am, const char *path,
   }
 
   if (!loaded) {
+    printf("Error loading %s: %s\n", path, SDL_GetError());
     return INVALID_ID;
   }
 
@@ -266,7 +285,7 @@ void remove_asset_from_manager(AssetManager *am, AssetID *id_ptr) {
   remove_id_node(&(am->hashed_path_ids[hash_index]), id);
 
   free(am->assets[id].path);
-  am->assets[id].path = 0;
+  am->assets[id].path = NULL;
 
   switch (am->assets[id].type) {
   case ASSET_TYPE_IMAGE:
@@ -274,10 +293,12 @@ void remove_asset_from_manager(AssetManager *am, AssetID *id_ptr) {
     am->assets[id].data.texture = NULL;
     break;
   case ASSET_TYPE_AUDIO_FX:
-    // TODO (Abdelrahman): Implement closing audio chunk
+    Mix_FreeChunk(am->assets[id].data.chunk);
+    am->assets[id].data.chunk = NULL;
     break;
   case ASSET_TYPE_MUSIC:
-    // TODO (Abdelrahman): Implement closing music
+    Mix_FreeMusic(am->assets[id].data.music);
+    am->assets[id].data.music = NULL;
     break;
   default:
     break;
@@ -289,7 +310,7 @@ void remove_asset_from_manager(AssetManager *am, AssetID *id_ptr) {
 }
 
 SDL_Texture *get_texture(AssetManager *am, AssetID id) {
-  if (am->assets[id].type != ASSET_TYPE_IMAGE) {
+  if (id < 0 || am->assets[id].type != ASSET_TYPE_IMAGE) {
     return NULL;
   }
 
@@ -297,7 +318,7 @@ SDL_Texture *get_texture(AssetManager *am, AssetID id) {
 }
 
 Mix_Chunk *get_audio_chunk(AssetManager *am, AssetID id) {
-  if (am->assets[id].type != ASSET_TYPE_AUDIO_FX) {
+  if (id < 0 || am->assets[id].type != ASSET_TYPE_AUDIO_FX) {
     return NULL;
   }
 
@@ -305,46 +326,48 @@ Mix_Chunk *get_audio_chunk(AssetManager *am, AssetID id) {
 }
 
 Mix_Music *get_music(AssetManager *am, AssetID id) {
-  if (am->assets[id].type != ASSET_TYPE_MUSIC) {
+  if (id < 0 || am->assets[id].type != ASSET_TYPE_MUSIC) {
     return NULL;
   }
 
   return am->assets[id].data.music;
 }
 
-void destroy_asset_manager(AssetManager *am) {
-  if (!am) {
+void destroy_asset_manager(AssetManager **am) {
+  if (!(*am)) {
     return;
   }
 
-  for (size_t i = 0; i < am->count; ++i) {
-    am->user_counter[i] = 0;
+  for (size_t i = 0; i < (*am)->count; ++i) {
+    (*am)->user_counter[i] = 0;
 
-    size_t hash_index = hash_path(am->assets[i].path);
-    remove_id_node(&(am->hashed_path_ids[hash_index]), i);
+    size_t hash_index = hash_path((*am)->assets[i].path);
+    remove_id_node(&((*am)->hashed_path_ids[hash_index]), i);
 
-    free(am->assets[i].path);
-    am->assets[i].path = NULL;
+    free((*am)->assets[i].path);
+    (*am)->assets[i].path = NULL;
 
-    switch (am->assets[i].type) {
+    switch ((*am)->assets[i].type) {
     case ASSET_TYPE_IMAGE:
-      SDL_DestroyTexture(am->assets[i].data.texture);
-      am->assets[i].data.texture = NULL;
+      SDL_DestroyTexture((*am)->assets[i].data.texture);
+      (*am)->assets[i].data.texture = NULL;
       break;
     case ASSET_TYPE_AUDIO_FX:
-      // TODO (Abdelrahman): Implement closing audio chunk
+      Mix_FreeChunk((*am)->assets[i].data.chunk);
+      (*am)->assets[i].data.chunk = NULL;
       break;
     case ASSET_TYPE_MUSIC:
-      // TODO (Abdelrahman): Implement closing music
+      Mix_FreeMusic((*am)->assets[i].data.music);
+      (*am)->assets[i].data.music = NULL;
       break;
     default:
       break;
     }
   }
 
-  am->count = 0;
-  am->deleted_count = 0;
+  (*am)->count = 0;
+  (*am)->deleted_count = 0;
 
-  free(am);
-  am = NULL;
+  free(*am);
+  *am = NULL;
 }