Render pipeline working.

src/display/render.h

@@ -15,8 +15,9 @@ void renderInit();
 /**
  * Render a single frame of the render loop. The renderer is not (currently)
  * responsible for render looping.
+ * @param render The render manager
  */
-void renderFrameStart();
+void renderFrameStart(render_t *render);
 
 /**
  * Cleanup a render context.