80 lines
3.0 KiB
C
80 lines
3.0 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 fragment outputs 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_instr *instr, void *data)
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{
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unsigned *num_smooth_aa_sample = data;
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if (instr->type != nir_instr_type_intrinsic)
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return false;
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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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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if ((location != FRAG_RESULT_COLOR && location < FRAG_RESULT_DATA0) ||
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nir_intrinsic_src_type(intr) != nir_type_float32)
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return false;
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assert(intr->src[0].is_ssa);
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assert(intr->num_components == 4);
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b->cursor = nir_before_instr(&intr->instr);
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nir_ssa_def *coverage = nir_load_sample_mask_in(b);
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/* coverage = (coverage) / SI_NUM_SMOOTH_AA_SAMPLES */
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coverage = nir_bit_count(b, coverage);
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coverage = nir_u2f32(b, coverage);
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coverage = nir_fmul_imm(b, coverage, 1.0 / *num_smooth_aa_sample);
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/* Write out the fragment color*vec4(1, 1, 1, alpha) */
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nir_ssa_def *one = nir_imm_float(b, 1.0f);
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nir_ssa_def *new_val = nir_fmul(b, nir_vec4(b, one, one, one, coverage),
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intr->src[0].ssa);
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nir_instr_rewrite_src(instr, &intr->src[0], nir_src_for_ssa(new_val));
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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_instructions_pass(shader, lower_polylinesmooth,
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nir_metadata_loop_analysis |
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nir_metadata_block_index |
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nir_metadata_dominance, &num_smooth_aa_sample);
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}
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