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Dave Airlie authored
This adds support for GL_ARB_texture_gather, and one step of support for GL_ARB_gpu_shader5. This adds support for passing the TG4 instruction, along with non-constant texture offsets, and tracking them for the optimisation passes. This doesn't support native textureGatherOffsets hw, to do that you'd need to add a CAP and if set disable the lowering pass, and bump the MAX offsets to 4, then do the i0,j0 sampling using those. Signed-off-by: Dave Airlie <airlied@redhat.com>
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