[Mesa-dev] [RFC PATCH] ARB_texture_gather support for Gen7 i965.

[Chris Forbes]

This series implements ARB_texture_gather in core mesa, and the
driver side for Gen7 i965.

Not quite baked -- green/blue/alpha texture swizzles with VS don't
work yet. Everything else works, though (R/0/1 swizzles in VS; all
swizzles in FS; textureGather and textureGatherOffset).

The first two patches are pretty much what Maxence sent out, but tidied
up so they work; the third patch of that original series (st + softpipe)
is dropped for now, but shouldn't be hard to reinclude.