Determining Extension Availability

Determining Extension Availability

Function names and tokens for OpenGL extensions have EXT or a vendor-specific acronym as a suffix, for example glConvolutionFilter2DEXT() or glColorTableSGI(). The names of the extensions themselves (the extension strings) use prefixes, for example, SGI_color_table. Here's a detailed list of all suffixes and prefixes:

EXT is used for extensions that have been reviewed and approved by more than one OpenGL vendor. (Typically these are supported by at least two OpenGL vendors.)
SGI is used for extensions that may be found across the Silicon Graphics product line, although the support for all products may not appear in the same release.
SGIS is used for extensions that can be found only on a subset of Silicon Graphics platforms.
SGIX is used for extensions that are experimental: in future releases, the API for these extensions may change, or they may not be supported at all.

How to Check for OpenGL Extension Availability
Example Program: Checking for Extension Availability
Checking for GLX Extension Availability