Re: NOT synchronizing to vertical retrace

Orad Hi-Tec Systems (orad_u++at++netvision.net.il)
Wed, 15 Jan 1997 08:14:29 +0200

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> 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
>

Maybe I didn't make myself clear enough.

I *dont* want to swap buffers:

> > an event different
> > from a vertical retrace of the framebuffer (i.e., NOT to
> > glXSwapBuffers(), glXWaitVideoSyncSGI(), etc.).

Of course, a buffer swap has to synchronize (or at least pend
rasterization of the following GL tokens) to a vertical retrace.

Moshe Nissim
Orad Hi-Tec Systems
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