Rice's video ScreenUpdateSetting

I want to add this Rice's only feature to the other Glide64 plugins, particularly the ScreenUpdateSetting: VI origin update, since it gives me the smoothest frame rate in all the games I tested so far without too many bugs. But I am stuck and need some help.

So far in Rice's video this function is located in video.cpp "static void UpdateScreenStep2 (void)" function, line 199...

And its closest equivalent in Glide64 video's Main.cpp "EXPORT void CALL UpdateScreen (void)" function, line 1489

Any thoughts? thanks in advance...