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nir/lower_poly_line_smooth: support partial store_output

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RADV needs this to skip if there is no alpha component

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Acked-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33340>
This commit is contained in:
Georg Lehmann 2025-02-01 20:10:43 +01:00 • committed by Marge Bot
parent 6c410456d9
commit 359ba65903
1 changed files with 6 additions and 6 deletions
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12
src/compiler/nir/nir_lower_poly_line_smooth.c
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@ -26,7 +26,7 @@
/**
* This NIR lowers pass for polygon and line smoothing by modifying the alpha
* value of fragment outputs using the sample coverage mask.
* value of the first fragment output using the sample coverage mask.
*/
static bool
@ -43,12 +43,12 @@ lower_polylinesmooth(nir_builder *b, nir_instr *instr, void *data)
return false;
int location = nir_intrinsic_io_semantics(intr).location;
int alpha_comp = 3 - nir_intrinsic_component(intr);
if ((location != FRAG_RESULT_COLOR && location != FRAG_RESULT_DATA0) ||
nir_intrinsic_src_type(intr) != nir_type_float32)
nir_intrinsic_src_type(intr) != nir_type_float32 ||
!(nir_intrinsic_write_mask(intr) & BITFIELD_BIT(alpha_comp)))
return false;
assert(intr->num_components == 4);
b->cursor = nir_before_instr(&intr->instr);
nir_def *coverage = nir_load_sample_mask_in(b);
@ -59,11 +59,11 @@ lower_polylinesmooth(nir_builder *b, nir_instr *instr, void *data)
coverage = nir_fmul_imm(b, coverage, 1.0 / *num_smooth_aa_sample);
nir_def *smooth_enabled = nir_load_poly_line_smooth_enabled(b);
nir_def *alpha = nir_channel(b, intr->src[0].ssa, 3);
nir_def *alpha = nir_channel(b, intr->src[0].ssa, alpha_comp);
nir_def *smooth_alpha = nir_fmul(b, alpha, coverage);
nir_def *new_alpha = nir_bcsel(b, smooth_enabled, smooth_alpha, alpha);
nir_def *new_src = nir_vector_insert_imm(b, intr->src[0].ssa, new_alpha, 3);
nir_def *new_src = nir_vector_insert_imm(b, intr->src[0].ssa, new_alpha, alpha_comp);
nir_src_rewrite(&intr->src[0], new_src);
return true;