Alyssa Rosenzweig
95458c4033
If the shader packs multiple varyings into the same location with different location_frac, we'll need to lower to a single varying store that collects all of the channels together. This is not trivial during code gen, but it is trivial to do in NIR right before codegen by relying on nir_lower_io_to_temporaries. Since we're guaranteed all varyings will be written exactly once, in the exit block, we can scan the shader linearly and collect stores together in a single pass. Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11123>
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