Re: Underlays in Performer

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Rob Jenkins (robj++at++sgi.com)
Mon, 12 Oct 1998 20:56:45 +0100

Sandeep Mulgund wrote:
>
> I've used overlay planes extensively in Performer, but now I'm trying to
> set up a window as an "underlay" to my normal double-buffered pfPipeWindow.
> Are there any examples out there on how to do this? The Performer
> documentation has a couple of vague references on setting up underlays, but
> I haven't been able to get it to work. Any suggestions?
>

OpenGl doesn't support rendering to underlays. IrisGL used to know how
to render to an X underlay visual, OpenGL doesn't. If you run your
performer app on a native IrisGL machine ( ie pre Impact ) then running
with performer linked to IrisGL should work if you give pfChooseFBConfig
a negative PFFB_LEVEL value but that won't work on a native OpenGL
machine, rendering with OpenGL.

Cheers
Rob

> Thanks,
>
> Sandeep
>
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-- 
________________________________________________________________
Rob Jenkins	Silicon Graphics 	mailto:robj++at++sgi.com

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