Thursday was a heck of a day for Mesa development activity with several new OpenGL extensions having been merged, the Xorg state tracker being nuked, and the new game developer-focused GLX extension landing. However, that was not all and in the last commits prior to branching Mesa 10.0 from Git master was the adding of DRI3 support...
November 8, 2013
DRI3 Support Merged Into Mesa 10.0
Read more at Phoronix