| Re: [AD] show_video_bitmap() documentation a bit misleading... |
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On 2003-01-13, Eric <ebotcazou@xxxxxxxxxx> wrote:
> > The point you make, show_video_bitmap() doesn't wait for vsync with SVGALIB
> > driver, is a good one, and it looks like a bug to me.
>
> Seconded. The SVGALib driver is a scrolling driver, but the docs for
> scroll_screen() are pretty clear:
> "Allegro will handle any necessary vertical retrace synchronisation when
> scrolling the screen, so you don't need to call vsync() before it. This means
> that scroll_screen() has the same time delay effects as vsync()."
>
> Peter, you're the specialist here, how comes that the driver doesn't seem to
> wait for the vsync ?
Probably either the original author didn't do it, or I assumed that
SVGAlib would handle it automatically. I never really did test the
scrolling features extensively...
--
王浩禎