glsl_to_tgsi: add TXF support. (v2)

This adds texelFetch support to translate from GLSL to TGSI TXF opcode.

I've tested this works with an r600g and softpipe backend.

v2: drop comments, fix title,

Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Bryan Cain <bryancain3@gmail.com>
1 file changed