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nak/nir: Return one sample for gl_SampleMaskIn[0] when sample shading

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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24998>
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Faith Ekstrand 2023-09-21 16:42:48 -05:00 • committed by Marge Bot
parent 0e393f0d58
commit 6da06bf7d7
1 changed files with 16 additions and 0 deletions
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16
src/nouveau/compiler/nak_nir.c
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@ -422,6 +422,22 @@ lower_fs_input_intrin(nir_builder *b, nir_intrinsic_instr *intrin, void *data)
return true;
}
case nir_intrinsic_load_sample_mask_in: {
if (!b->shader->info.fs.uses_sample_shading &&
!(fs_key && fs_key->force_sample_shading))
return false;
b->cursor = nir_after_instr(&intrin->instr);
/* Mask off just the current sample */
nir_def *sample = nir_load_sample_id(b);
nir_def *mask = nir_ishl(b, nir_imm_int(b, 1), sample);
mask = nir_iand(b, &intrin->def, mask);
nir_def_rewrite_uses_after(&intrin->def, mask, mask->parent_instr);
return true;
}
default:
return false;
}