Radeon_RoundVWidth
eff_virtual_width = Radeon_RoundVWidth( target->virtual_height, bpp );
vc->pitch = Radeon_RoundVWidth( mode.virtual_width, bpp ) * bpp;
values->crtc_pitch = Radeon_RoundVWidth( mode->virtual_width, vc->bpp ) / 8;
uint32 Radeon_RoundVWidth( int virtual_width, int bpp );