It has an almost complete implementation of BGLView, etc. I dunno if its enough to support Blender3D, but I think it is. Teapot, etc all work perfectly.
Cool! Has there been talk about putting it in the Haiku source tree. The license seems to be capatible.
Since one of the Haiku devs (Philippe Houdoin, network team leader) was the one that provided the original Mesa port for BeOS, and according to statements and perceived intent specified in this thread (see comments by phoudoin):
It would appear that Mesa is already intended as the basis of Haiku's OpenGL implementation. With appropriate information and driver-development effort, the software-rendering already present in Mesa can be substituted with 3d hardware-acceleration as necessary. Unfortunately this is the hard part as 3d hardware acceleration is somewhat of a trade-secret for video card manufacturers...
I'm not sure anything official has been stated, but I think based on what I have read here and elsewhere, that there is a high likelihood that Mesa will become part of the Haiku sourcetree if licensing permits.