[Mesa-dev] mesa: ARB_blend_func_extended (second pass)

[Dave Airlie]

These 7 patches contain core support for ARB_blend_func_extended,
along with gallium + softpipe + r600g support.

I've tested the interaction with ARB_explicit_attrib_location and
it works better now, and I've also caught a few more bugs with tests
in piglit.

I've got an fbo test to push to piglit along with an explicit attrib test.

also patch 1 should be a lot more reviewable now, I moved stuff around
so git diff didn't generate such a mess.

Dave.