private static extern IntPtr BulletDebugDraw_Create(DrawLineCallback drawLine, ReportErrorWarningCallback reportWarning
#if FULL_AOT_COMPILE
                                                            , IntPtr instanceHandle
#endif
                                                            );
 static CallbackHandler()
 {
     drawLineStorage           = new DrawLineCallback(drawLine);
     reportErrorWarningStorage = new ReportErrorWarningCallback(reportErrorWarning);
 }