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intel/fs: Use nir_lower_single_sampled

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This lets us drop demote_sample_qualifiers as well as a back-end check
for key->multisample_fbo.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14020>
This commit is contained in:
Jason Ekstrand
2021-11-19 13:00:09 -06:00
committed by Marge Bot
parent 23b2d625dd
commit fd17aaf430
3 changed files with 6 additions and 113 deletions
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49
src/intel/compiler/brw_fs.cpp
View File

@@ -1322,13 +1322,9 @@ fs_visitor::emit_sampleid_setup()
const fs_builder abld = bld.annotate("compute sample id");
fs_reg sample_id = abld.vgrf(BRW_REGISTER_TYPE_UD);
if (!key->multisample_fbo) {
/* As per GL_ARB_sample_shading specification:
* "When rendering to a non-multisample buffer, or if multisample
* rasterization is disabled, gl_SampleID will always be zero."
*/
abld.MOV(sample_id, brw_imm_d(0));
} else if (devinfo->ver >= 8) {
assert(key->multisample_fbo);
if (devinfo->ver >= 8) {
/* Sample ID comes in as 4-bit numbers in g1.0:
*
* 15:12 Slot 3 SampleID (only used in SIMD16)
@@ -7228,43 +7224,6 @@ brw_nir_move_interpolation_to_top(nir_shader *nir)
return progress;
}
static bool
brw_nir_demote_sample_qualifiers_instr(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_sample &&
intrin->intrinsic != nir_intrinsic_load_barycentric_at_sample)
return false;
b->cursor = nir_before_instr(instr);
nir_ssa_def *centroid =
nir_load_barycentric(b, nir_intrinsic_load_barycentric_centroid,
nir_intrinsic_interp_mode(intrin));
nir_ssa_def_rewrite_uses(&intrin->dest.ssa, centroid);
nir_instr_remove(instr);
return true;
}
/**
* Demote per-sample barycentric intrinsics to centroid.
*
* Useful when rendering to a non-multisampled buffer.
*/
bool
brw_nir_demote_sample_qualifiers(nir_shader *nir)
{
return nir_shader_instructions_pass(nir,
brw_nir_demote_sample_qualifiers_instr,
nir_metadata_block_index |
nir_metadata_dominance,
NULL);
}
static void
brw_nir_populate_wm_prog_data(const nir_shader *shader,
const struct intel_device_info *devinfo,
@@ -7399,8 +7358,6 @@ brw_compile_fs(const struct brw_compiler *compiler,
NIR_PASS_V(nir, brw_nir_lower_alpha_to_coverage);
}
if (!key->multisample_fbo)
NIR_PASS_V(nir, brw_nir_demote_sample_qualifiers);
NIR_PASS_V(nir, brw_nir_move_interpolation_to_top);
brw_postprocess_nir(nir, compiler, true, debug_enabled,
key->base.robust_buffer_access);

3
src/intel/compiler/brw_nir.c
View File

@@ -452,6 +452,9 @@ brw_nir_lower_fs_inputs(nir_shader *nir,
if (devinfo->ver >= 11)
nir_lower_interpolation(nir, ~0);
if (!key->multisample_fbo)
nir_lower_single_sampled(nir);
nir_shader_instructions_pass(nir, lower_barycentric_at_offset,
nir_metadata_block_index |
nir_metadata_dominance,