Khronos OpenGL® Registry - The Khronos Group IncThe OpenGL Registry contains specifications of the core API and shading language; specifications of Khronos- and vendor-approved OpenGL extensions; header files corresponding to the specifications; and related documentation including specifications, extensions, and headers for the GLX, WGL, and GLU APIs. The OpenGL registry is part of the Combined OpenGL Registry for OpenGL, OpenGL ES, and OpenGL
