zink: lower subgroup width to 1 for unsupported subgroup vote stages
this should handle unsupported gfx subgroup vote cc: mesa-stable Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16757>
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@ -2203,6 +2203,10 @@ zink_shader_create(struct zink_screen *screen, struct nir_shader *nir,
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subgroup_options.ballot_bit_size = 32;
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subgroup_options.ballot_components = 4;
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subgroup_options.lower_subgroup_masks = true;
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if (!(screen->info.subgroup.supportedStages & mesa_to_vk_shader_stage(nir->info.stage))) {
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subgroup_options.subgroup_size = 1;
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subgroup_options.lower_vote_trivial = true;
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}
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NIR_PASS_V(nir, nir_lower_subgroups, &subgroup_options);
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}
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