static CallbackHandler()
 {
     if (RocketInterface.LoadImagesInBackground)
     {
         queueBackgroundImageLoad = new QueueBackgroundImageLoad(queueBackgroundImageLoadImpl);
     }
 }
        private static extern IntPtr RenderInterfaceOgre3D_Create(int width, int height, QueueBackgroundImageLoad queueBackgroundImageLoad
#if FULL_AOT_COMPILE
                                                                  , IntPtr instanceHandle
#endif
                                                                  );