This release supports GLX 1.3 with the following extensions:
GLX_EXT_visual_info
GLX_EXT_visual_rating
GLX_SGIX_fbconfig
GLX_SGIX_pbuffer
GLX_ARB_get_proc_address
For a description of these extensions, please see the OpenGL extension registry at http://oss.sgi.com/projects/ogl-sample/registry/index.html
Some of the above extensions exist as part of core GLX 1.3 functionality, however, they are also exported as extensions for backwards compatibility.