Mesa 4.0 Implements OpenGL 1.3 Spec
Jacek Fedorynski writes: "Version 4.0 of the Mesa 3D
Graphics Library has been released. The first thing in the changelog says "Mesa 4.0 implements the OpenGL 1.3 specification"." That was quick. Perhaps the next revision of the OpenGL specification will say "Now fully compliant with the Mesa 3D vision."
The reason it happened so quick is that most of what went into OpenGL 1.3 has already been around as extensions for quite some time. Mesa had already implemented those extensions and only needed minimal changes to bring it into compliance with the new version of OpenGL.