From: Dick Rous (dick++at++sgi.com)
Date: 09/02/2002 00:16:22
Hi Frans,
according the GLX spec, sharing of OpenGL display lists is only
possible between glXContexts on the same X screen. So in your case,
you could share between right /left eye pairs only.
For the 4 pipes you need 4 parallel processes/threads, each with
their own, independent glXContext.
SGI's Performer and MultipipeSDK API's solve the multipipe
issues for you.
I'm in Groningen tomorrow. We can speak details then.
Regards,
Dick.
> -----Original Message-----
> From: Frans van Hoesel [mailto:F.H.J.van.Hoesel++at++chem.rug.nl]
> Sent: Sunday, September 01, 2002 15:27
> To: info-performer++at++sgi.com
> Subject: [info-performer] 4 pipe efficiency question
>
>
>
> Hi,
>
> It is basically a hardware, opengl related graphics question, but
> I think the knowledge of these these things is much higher
> in this group, which is the reason I post my question here.
>
> We need to render in stereo to a 4 sided cubical projection system,
> which means that every object in the scene in possibly drawn 8 times
> (but culling is likely to reduce this number a bit).
> The geometry itself is drawn using opengl (sorry no performer), but
> changes its shape every frame.
> Currently we put this shape into an array and use the array
> extensions to draw the geometry.
> The questions is about effeciency. Would it be better to use a display
> list for such shapes and use COMPILE_AND_EXECUTE mode for
> filling them,
> and then call the list possibly 7 more times? Are the
> displaylist shared
> efficiently between the 4 pipesvia a separate, hopefully very
> fast, bus?
> If there is such a connection, it might be a good idea, but is it???
>
> best regards,
>
> -frans
>
> _______________________________________________________________
>
> "Hi, my name is Frans, I'm your crazy scientist for today."
>
> Frans van Hoesel hoesel++at++chem.rug.nl
> http://hpcv100.rc.rug.nl/~hoesel
> _______________________________________________________________
>
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