[Mesa-dev] gallium ARB_texture_multisample support + r600g

[Dave Airlie]

I sent these before, and Marek reviewed them (the first 3 at least).

But I'd like to have the r600g one looked at before I pushed it,
I rewrote it to properly return the sample positions from the
correct place.

One other issue is all the 2D MS Array sampler tests fail on r600g,
not sure why, I've tested it on my hacked up softpipe and they seem
fine, so it doesn't seem like an st problem, so I don't think it
should block pushing these.

Dave.