[Mesa-dev] intel driver blit rework

[Eric Anholt]

Here's a big rework of blitting.  It's a followon to some of the work I
started back in February to make struct intel_region die in a fire.  It's
not a reduction in code like I hoped, but it's a reduction in a lot of
bugs and it should help make extension of our driver to support fast color
clears (and possibly zero-copy PBOs again) much easier.

The code is available at mtblit of
git://people.freedesktop.org/~anholt/mesa