Using OpenGL Extensions
By design, OpenGL implementors are free to extend OpenGL’s basic rendering functionality with new rendering operations. This extensibility was one of OpenGL’s original design goals. As a result, scores of OpenGL extensions have been specified and implemented. These extensions provide OpenGL application developers with new rendering features above and beyond the features specified in the official OpenGL standard. OpenGL extensions keep the OpenGL API current with the latest innovations in graphics hardware and rendering algorithms.
This appendix describes the OpenGL extension mechanism. It describes how extensions are used and documented as well as how to use extensions portably in applications. Particular attention ...
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