nir/lower_clip: Only emit 1 discard (!21103) · Merge requests · Mesa / mesa

Alyssa Rosenzweig requested to merge alyssa/mesa:nir/lower-clip-opt into main Feb 03, 2023

If we have multiple clip planes, rather than emit multiple discards we can just OR together the discard criteria. Then a nir_opt_algebraic rule kicks in to optimize out the flt/.../flt/ior/.../ior into fmin/.../fmin/flt, generating much less code at the end.

Written while debugging an unrelated issue with the clip lowering.

Signed-off-by: Alyssa Rosenzweig alyssa@rosenzweig.io

nir/lower_clip: Only emit 1 discard

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