GLEX is an OpenGL Extension Specification Parser which is used to turn OpenGL extension specification files into a set of compact C source files that can be easily included into existing projects to initialize only the desired extension or core API function pointers.

This is version 1 of GLEX which parses the human-readable *.txt specification files, while GLEX 2 parses the database *.spec / *.tm files. Both specification file types are linked from the OpenGL Registry. As GLEX is written in PHP, it can be easily used from both the command line and via a web front-end.