DX9: Added another comment to further elaborate what drawShadedTexQuad is doing.
This comment should give a great speed increase, numerous games (SMG, NSMBW, DKCR, …) which I tested are at least 20% faster now!
DX9: Write a detailed description of the vertex position offset magic in drawShadedTexQuad. I hope this makes at least a bit sense to anyone but me, it’s better than no documentation at all though.
DX9: Revert to the old EFB coordinate scaling. Glitches caused by higher EFB scales probably can’t even be fixed properly in DX9, so let’s not even mess with it…