There's another item on the TODO list for Mesa's OpenGL 3.0 support
to scratch off. Marek Olšák has been viciously finishing up bits of OpenGL 3.0 support (along with his always-excellent work to the Radeon Gallium3D drivers) and has now produced a set of 13 patches that provide floating-point depth buffers.
The 13 patches that were announced by Marek yesterday evening implement the ARB_depth_buffer_float OpenGL extension in Mesa and Gallium3D. This is part of OpenGL 3.0. Not implemented is NVIDIA's version of this extension, NV_depth_buffer_float, since it's incompatible with the official Khronos extension. Of course, Marek has ensured that this code is working with the ATI/AMD R600 Gallium3D driver.
Find the set of patches currently on the Mesa mailing list
. They'll be committed to master soon, which means it will be part of Mesa 7.12 (or Mesa 8.0 if OpenGL 3.0 is finished in the next six months) and released next January.