Added support for desktop full screen with pillarboxing and letterboxing

and started adding some comments to the code

src/AssetManager.c

@@ -46,6 +46,10 @@ struct asset_manager {
 };
 
 size_t hash_path(const char *path) {
+  /**
+   * Converts a string into a numerical index using a simple hashing algorithm
+   */
+
   size_t i = 0;
 
   for (size_t j = 0; path[j]; ++j) {
@@ -125,6 +129,11 @@ void remove_id_node(IDNodeList *node_list, AssetID id) {
 
 AssetID get_asset_id_from_id_node(AssetManager *am, IDNodeList *node_list,
                                   const char *path) {
+  /**
+   * Checks to see if an asset with the same path exists and returns the ID of
+   * that asset if it exists, or an INVALID_ID otherwise
+   */
+
   if (node_list->node_count == 0) {
     return INVALID_ID;
   }
@@ -184,9 +193,14 @@ AssetID load_asset_to_manager(AssetManager *am, const char *path,
     }
 
     ++(am->user_counter[existing_id]);
+
     return existing_id;
   }
 
+  if (am->count + 1 == MAX_ASSET_COUNT && am->deleted_count == 0) {
+    return INVALID_ID;
+  }
+
   Asset asset = {};
   bool loaded = true;
 
@@ -363,7 +377,14 @@ void destroy_asset_manager(AssetManager **am) {
     return;
   }
 
-  for (size_t i = 0; i < (*am)->count; ++i) {
+  // TODO (Abdelrahman): Figure out if there is a better way to remove all of
+  // the existing assets without having to loop for the maximum number of
+  // assets allowed.
+  for (size_t i = 0; i < MAX_ASSET_COUNT; ++i) {
+    if (!(*am)->assets[i].path) {
+      continue;
+    }
+
     (*am)->user_counter[i] = 0;
 
     size_t hash_index = hash_path((*am)->assets[i].path);