Re: NOT synchronizing to vertical retrace

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Wed, 15 Jan 1997 09:56:43 +0000

On Jan 14, 9:32pm, Orad Hi-Tec Systems wrote:
> Subject: NOT synchronizing to vertical retrace
> I want to synchronize my Performer app to an event different
> from a vertical retrace of the framebuffer (i.e., NOT to
> glXSwapBuffers(), glXWaitVideoSyncSGI(), etc.). If I refrain
> from calling pfSync() directly, it gets called internally by
> pfFrame().
> How can I do this?
> For simplicity, lets assume that we are running single-process.
>

The video rate is king. Even if you lock the app to a different rate
you'll still experience problems because your draw will still render
to a multiple of the video. You either have to genlock the video to
bring the I.G. into line or use the vertical sync to lock your i/o.

You could also try resampling the data to match your video rate and
don't bother with the lock. Usually this is less than an optimal
solution.

Cheers,
Angus.
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