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intel/nir: Lower barycentrics to per-sample in a dedicated pass

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This is more similar to what we do for single-sample and it should be
more clear going forward once our lowering gets more complex.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21094>
This commit is contained in:
Jason Ekstrand
2021-11-19 16:11:44 -06:00
committed by Marge Bot
parent 991d546102
commit d25e5310bc
1 changed files with 31 additions and 6 deletions
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37
src/intel/compiler/brw_nir.c
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@@ -455,6 +455,28 @@ brw_nir_lower_tes_inputs(nir_shader *nir, const struct brw_vue_map *vue_map)
}
}
static bool
lower_barycentric_per_sample(nir_builder *b,
nir_instr *instr,
UNUSED void *cb_data)
{
if (instr->type != nir_instr_type_intrinsic)
return false;
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
if (intrin->intrinsic != nir_intrinsic_load_barycentric_pixel &&
intrin->intrinsic != nir_intrinsic_load_barycentric_centroid)
return false;
b->cursor = nir_before_instr(instr);
nir_ssa_def *centroid =
nir_load_barycentric(b, nir_intrinsic_load_barycentric_sample,
nir_intrinsic_interp_mode(intrin));
nir_ssa_def_rewrite_uses(&intrin->dest.ssa, centroid);
nir_instr_remove(instr);
return true;
}
/**
* Convert interpolateAtOffset() offsets from [-0.5, +0.5] floating point
* offsets to integer [-8, +7] offsets (in units of 1/16th of a pixel).
@@ -526,16 +548,19 @@ brw_nir_lower_fs_inputs(nir_shader *nir,
}
}
nir_lower_io_options lower_io_options = nir_lower_io_lower_64bit_to_32;
if (key->persample_interp)
lower_io_options |= nir_lower_io_force_sample_interpolation;
nir_lower_io(nir, nir_var_shader_in, type_size_vec4, lower_io_options);
nir_lower_io(nir, nir_var_shader_in, type_size_vec4,
nir_lower_io_lower_64bit_to_32);
if (devinfo->ver >= 11)
nir_lower_interpolation(nir, ~0);
if (!key->multisample_fbo)
if (!key->multisample_fbo) {
nir_lower_single_sampled(nir);
} else if (key->persample_interp) {
nir_shader_instructions_pass(nir, lower_barycentric_per_sample,
nir_metadata_block_index |
nir_metadata_dominance,
NULL);
}
nir_shader_instructions_pass(nir, lower_barycentric_at_offset,
nir_metadata_block_index |