Clipper problems in UnDelphiX

[FanboyNo1]

What is "clipper"?

It is a function that limits output to certain regions of the screen. So if you for instance have a "radar screen" in your game (and this radar does not fill the entire physical screen) - the clipper "clips" the part of the images that you draw, that fall outside the region you have specified (in this case the outline of the "radar screen).

[User137]

I think OpenGL at least supports setting viewport multiple times per frame effortlessly. Maybe the UnDelphiX implementation of it is unfinished. Alternative is to render into a surface/texture and then draw that, but it could be slower.