[info-performer] Offscreen rendering on Linux: PBuffer and setFBConfig problem

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From: Alexandre Meyer (a.meyer++at++cs.ucl.ac.uk)
Date: 08/23/2002 14:09:02

Hi,

I would like to use a PBuffer under Linux (extension GLX_SGIX_pbuffer on GForce4).
I am able to create and use this kind of pbuffer without performer, so this extension
works on my Linux box.

With Performer my inspiration is the example file .../pguide/libpf/C/pbuffer.c
With my code and with the pbuffer.c example I obtain this :

PF Warning/Usage: pfWindow::open - window of type PFWIN_TYPE_PBUFFER - required
GLXFBConfig is NULL - set with ::setFBConfig.
and then a core dump!

But I call the setFBConfig function and my argument is not NULL. ??

The strange thing is in the file /usr/include/Performer/pr.h, if the system
is Linux pfGLXConfig is defined by void*, that means setFBConfig take a void*
as argument.

Why "void*" and not "GLXFBConfigSGIX" as on SGI?
That means GLX_SGIX_pbuffer extension is not implemented on Perf/Linux?

I don't want to use this extension specially, I just want to do off-screen rendering
on Linux with Performer, if someone has an other solution?

Thanks,
Alex 

--
 Alexandre Meyer <A.Meyer++at++cs.ucl.ac.uk>
 University College London, Virtual Environments and Computer Graphics Lab
 http://www.cs.ucl.ac.uk/staff/a.meyer

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