Re: NOT synchronizing to vertical retrace

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Rémi Arnaud (remi++at++remi.asd.sgi.com)
Tue, 14 Jan 1997 12:51:31 -0800 (PST)

Orad Hi-Tec Systems wrote:
>
> 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.

 A swap buffer is always on a vertial retrace. This is because
 you want to avoid switching from two different images in
 a middle of a retrace.

 But, you can synchronize (genlock) the vertical retrace to an
 external source using ircombine if it's what you want to do

 Best Regards

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