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Chris Forbes authored
ARB_gpu_shader5 introduces new variants of textureGather* which have an explicit component selector, rather than relying purely on the sampler's swizzle state. This patch adds the GLSL plumbing for the extra parameter. Signed-off-by: Chris Forbes <chrisf@ijw.co.nz> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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