Re: How do I wait for vertical retrace?

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On Tue, 6 May 2008 13:36:23 +0200 "Johan Walles" <johan.walles@xxxxxxxxx>babbled:
> 2008/5/6 Michel Dänzer <michel@xxxxxxxxxxxxxxxxxxxx>:> > On Tue, 2008-05-06 at 13:12 +0200, Johan Walles wrote:> >  > 2008/5/6 Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>:> >  > > Michel Dänzer, le Tue 06 May 2008 09:37:23 +0200, a écrit :> >  > > > On Mon, 2008-05-05 at 15:43 +0100, Samuel Thibault wrote:> >  > >  > > Michel Dänzer, le Mon 05 May 2008 10:22:19 +0200, a écrit :> >  > >  > > > On Sun, 2008-05-04 at 20:06 +0200, Johan Walles wrote:> >  > >  > > > >> >  > >  > > > > I would like to wait for vertical retrace in an X> >  > >  > > > > application.  How can I do that?> >  > >  > > > >> >  > >  > > > > The point would be to avoid flicker in my app by using double> >  > >  > > > > buffering and update the on-screen image during vertical> >  > >  > > > > retrace.> >  > >  > > >> >  > >  > > > There's no mechanism for this yet in X. Your best bet is> >  > >  > > > probably to use OpenGL, e.g. the GLX_SGI_swap_control extension.> >  > >  > >> >  > >  > > Isn't there a more simple double buffering X extension?> >  > >  >> >  > >  > You mean DOUBLE-BUFFER?> >  > >> >  > >  Yes.> >  > >> >  > >  > I'm not really familiar with it, but I know that> >  > >  > at this time it can't synchronize buffer swaps to the refresh.> >  > >> >  > >  Eww, that would be a pity.  At the very beginning of the Extension> >  > >  documentation (Johan: xspecs/Xext/buffer.PS), it is said `Clients> >  > > should be able to [...] Display a series of buffers in a window in> >  > > rapid succession to achieve a /smooth/ animation', which is what Johan> >  > > wants to eventually achieve AIUI (vertical retrace wait being only one> >  > > method, I don't know whether which others could be possible).> >  >> >  > I don't care about vertical retrace in itself, waiting for vertical> >  > retrace would only be a way for me to achieve flicker-free animation> >  > in a 2D application.  Any other way of doing that would be fine as> >  > well.> >> >  I think the standard technique for double buffering is to use a pixmap> >  as the 'back buffer'.> > How would that help achieving flicker-free animation if it doesn't> wait for vertical retrace?
it is flicker free... just not tear-free :)
-- ------------- Codito, ergo sum - "I code, therefore I am" --------------The Rasterman (Carsten Haitzler)    raster@xxxxxxxxxxxxx
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