server, client and general GLX extensions and version numbers

Ioannis Nousias s0238762 at
Mon Dec 4 08:57:31 PST 2006

Brian Paul wrote:
> Ioannis Nousias wrote:
>> Running glxinfo, there are 3 sections for GLX extensions. The 
>> "server", "client" and another one (general?). Each of them has its 
>> own version number and and each of them has different number and 
>> mixture of extensions. Now, what I'd like to know is what do each of 
>> those sections represent and which part of Xorg, Mesa or whatever 
>> else provides them.
> Most GLX extensions require both client and server-side support, but 
> some are client-side only (like GLX_ARB_get_proc_address) and some are 
> server-side only (can't think of any off-hand).
>> I have 1.2 for the server, 1.4 for the client and 1.2 for the third one
>> the reason I'm asking this is because I have a problem with the 
>> GLX_EXT_texture_from_pixmap. It appears in the "server" and "client" 
>> section, but not in the general one, causing compiz to fail.
> Not sure about the GL_EXT_texture_from_pixmap stuff. Ian was the last 
> person to work on that.
>> the other reason I'm interested to know are the two GLX_SGIX_fbconfig 
>> and GLX_SGIX_pbuffer extensions. In my case these appear in the 
>> "client" section (which is 1.4 version), but the server and the third 
>> advertise only the GLX_SGIX_fbconfig.
>> anyone that could shed some light here?
> We still don't have server-side pbuffer support.
> -Brian
ok, I see.

I'm still confused though to what each of those corresponds to. Isn't 
the server side referring to Xorg's That resides in Mesa's 
source code, right? So if one would want to work on the server side for 
those GLX extensions, would he/she be looking at Mesa?

what's the client-side in this case? The drivers? And what's that third 
bit? Is it the "effective" support you get depending on the server and 
client features ?


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