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ed675272f4
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>
74 lines
3 KiB
C
74 lines
3 KiB
C
/*
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* Copyright © 2022 Advanced Micro Devices, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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/**
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* This NIR lowers pass for polygon and line smoothing by modifying the alpha
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* value of the first fragment output using the sample coverage mask.
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*/
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static bool
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lower_polylinesmooth(nir_builder *b, nir_intrinsic_instr *intr, void *data)
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{
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unsigned *num_smooth_aa_sample = data;
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if (intr->intrinsic != nir_intrinsic_store_output)
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return false;
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int location = nir_intrinsic_io_semantics(intr).location;
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int alpha_comp = 3 - nir_intrinsic_component(intr);
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if ((location != FRAG_RESULT_COLOR && location != FRAG_RESULT_DATA0) ||
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nir_alu_type_get_base_type(nir_intrinsic_src_type(intr)) != nir_type_float ||
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!(nir_intrinsic_write_mask(intr) & BITFIELD_BIT(alpha_comp)))
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return false;
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b->cursor = nir_before_instr(&intr->instr);
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nir_def *coverage = nir_load_sample_mask_in(b);
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/* coverage = (coverage) / num_smooth_aa_sample */
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coverage = nir_bit_count(b, coverage);
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coverage = nir_u2fN(b, coverage, intr->src[0].ssa->bit_size);
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coverage = nir_fmul_imm(b, coverage, 1.0 / *num_smooth_aa_sample);
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nir_def *smooth_enabled = nir_load_poly_line_smooth_enabled(b);
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nir_def *alpha = nir_channel(b, intr->src[0].ssa, alpha_comp);
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nir_def *smooth_alpha = nir_fmul(b, alpha, coverage);
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nir_def *new_alpha = nir_bcsel(b, smooth_enabled, smooth_alpha, alpha);
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nir_def *new_src = nir_vector_insert_imm(b, intr->src[0].ssa, new_alpha, alpha_comp);
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nir_src_rewrite(&intr->src[0], new_src);
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return true;
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}
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bool
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nir_lower_poly_line_smooth(nir_shader *shader, unsigned num_smooth_aa_sample)
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{
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assert(shader->info.stage == MESA_SHADER_FRAGMENT);
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return nir_shader_intrinsics_pass(shader, lower_polylinesmooth,
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nir_metadata_control_flow,
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&num_smooth_aa_sample);
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}
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