95 lines
3.4 KiB
C
95 lines
3.4 KiB
C
/*
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* Copyright © 2019 Google, 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 "compiler/nir/nir_builder.h"
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#include "ir3_nir.h"
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/**
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* This pass lowers load_barycentric_at_sample to load_sample_pos_from_id
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* plus load_barycentric_at_offset.
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*
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* It also lowers load_sample_pos to load_sample_pos_from_id, mostly because
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* that needs to happen at the same early stage (before wpos_ytransform)
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*/
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static nir_ssa_def *
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load_sample_pos(nir_builder *b, nir_ssa_def *samp_id)
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{
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return nir_load_sample_pos_from_id(b, 32, samp_id);
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}
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static nir_ssa_def *
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lower_load_barycentric_at_sample(nir_builder *b, nir_intrinsic_instr *intr)
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{
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nir_ssa_def *pos = load_sample_pos(b, intr->src[0].ssa);
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return nir_load_barycentric_at_offset(b, 32, pos, .interp_mode = nir_intrinsic_interp_mode(intr));
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}
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static nir_ssa_def *
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lower_load_sample_pos(nir_builder *b, nir_intrinsic_instr *intr)
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{
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nir_ssa_def *pos = load_sample_pos(b, nir_load_sample_id(b));
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/* Note that gl_SamplePosition is offset by +vec2(0.5, 0.5) vs the
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* offset passed to interpolateAtOffset(). See
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* dEQP-GLES31.functional.shaders.multisample_interpolation.interpolate_at_offset.at_sample_position.default_framebuffer
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* for example.
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*/
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nir_ssa_def *half = nir_imm_float(b, 0.5);
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return nir_fadd(b, pos, nir_vec2(b, half, half));
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}
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static nir_ssa_def *
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ir3_nir_lower_load_barycentric_at_sample_instr(nir_builder *b, nir_instr *instr,
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void *data)
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{
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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if (intr->intrinsic == nir_intrinsic_load_sample_pos)
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return lower_load_sample_pos(b, intr);
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else
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return lower_load_barycentric_at_sample(b, intr);
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}
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static bool
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ir3_nir_lower_load_barycentric_at_sample_filter(const nir_instr *instr,
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const void *data)
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{
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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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return (intr->intrinsic == nir_intrinsic_load_barycentric_at_sample ||
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intr->intrinsic == nir_intrinsic_load_sample_pos);
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}
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bool
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ir3_nir_lower_load_barycentric_at_sample(nir_shader *shader)
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{
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assert(shader->info.stage == MESA_SHADER_FRAGMENT);
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return nir_shader_lower_instructions(
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shader, ir3_nir_lower_load_barycentric_at_sample_filter,
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ir3_nir_lower_load_barycentric_at_sample_instr, NULL);
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}
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