Off screen rendering with GLX pixmaps

[Guillaume Duhamel]

Hi,

I'm trying to use GLX pixmaps to implement OpenGL off screen rendering
but I can't get it working on one of my box. I'm getting GLXBadContext
when I call glXMakeCurrent. I attached an example of the not working code.

The same code works on my other box and I guess the problem may come
from my graphic card. Now, how can I get off screen rendering working on
any configuration? Or, at least, how can I test that off screen rendering is
impossible?

Guillaume
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