[Xcb] Extension specification documents

[Antoine Latter]

Folks,

I'm not sure if this is the best list to ask, but here we go anyway.

I always have a heck of a time finding the written specifications for
parts of the X11 protocol.  Is there some central place for these
things?  Right now I'm looking for the specification for the GLX
extension, to look at which requests yield which errors, and which
versions of GLX support which requests.

More generally, where would I find this sort of thing for any of the extensions?

Thanks,
Antoine