These patches implement texelFetch/TXF via the "ld" sampler message on all i965 platforms. I've tested it on Broadwater, Cantiga, Sandybridge, and Ivybridge. Pretty sure I tested on Ironlake too, but a while ago. Piglit tests fs-texelFetch-2D and fs-texelFetchOffset-2D pass now. Huge thanks to Dave for writing those.