Render pipeline working.

src/engine/engine.c

@@ -16,7 +16,7 @@ void engineInit(engine_t *engine, game_t *game) {
 void engineUpdateStart(engine_t *engine, game_t *game, float delta) {
   epochUpdate(&engine->time, delta);
   inputUpdate(&engine->input);
-  renderFrameStart();
+  renderFrameStart(&engine->render);
 }
 
 bool engineUpdateEnd(engine_t *engine, game_t *game) {