Add tile grid and atlas concept to game

src/AssetManager.c

@@ -8,14 +8,20 @@ GLOBAL_VAR AssetManager assetManager;
 
 Texture *asset_getTexture(const enum TexList type)
 {
-	// NOTE(doyle): Since we're using a map, the count of an object can
-	// only be 1 or 0
 	if (type < texlist_count)
 		return &assetManager.textures[type];
 
 	return NULL;
 }
 
+TexAtlas *asset_getTextureAtlas(const enum TexList type)
+{
+	if (type < texlist_count)
+		return &assetManager.texAtlas[type];
+
+	return NULL;
+}
+
 const i32 asset_loadTextureImage(const char *const path, const enum TexList type)
 {
 	/* Open the texture image */