Xgl page - http://www.freedesktop.org/Software/Xgl

[Ian Romanick]

Michel Dänzer wrote:

> Ah, I was wondering why it wasn't using pbuffers... I'll look into why
> it doesn't advertise these extensions (maybe glitz could still try to
> use an extension if GetProcAddress succeeds for all needed functions?),
> but I think there might be another problem in glitz as well: For direct
> rendered contexts, shouldn't it use glXGetClientString(...,
> GLX_EXTENSIONS) instead of glXQueryExtensionsString() (and analogously
> for the GLX version)?

No!  glXGetClientString will list all the extensions that libGL *can* 
support.  For direct-rendering there is still handshaking between libGL 
and the DRI driver to determine the set of extensions to actually 
advertise.  Using glXGetClientString for this purpose is a mistake.  For 
most GLX extensions, like fbconfigs and pbuffers, the extension 
functionality is used *before* you have a context (direct or otherwise), 
so how could you even make this distinction?