Re: Clipfly & PFPHASE_LOCK

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Ran Yakir (rany++at++bvr.co.il)
Sun, 28 Mar 1999 12:38:46 +0200

Moshe Nissim wrote:

>
> Beside the sad fact that sginap() behaves this way on 6.5, why does Performer
> use this technique of sginap() loop at all?
> The OpenGL call glXWaitVideoSyncSGI() was constructed in such a way
> that it can wait not just simply for the next vertical retrace. From its man:
>
> glXWaitVideoSyncSGI puts the calling process to sleep until
> the value of the vertical retrace counter modulo divisor
> equals remainder.
>
> Wouldn't this be a better way to accomplish PFPHASE_LOCK ?
>
>

Hi Moshe,

I suppose that if you are using a swapbuffers callback for the pfPipe, you'de
like it to be called near the end of the frame. After you call glXWaiVideoSync,
you're too late.

Ran

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