107 lines
3.7 KiB
C
107 lines
3.7 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_offset to dsx.3d/dsy.3d and alu
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* instructions.
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*/
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static nir_ssa_def *
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load(nir_builder *b, unsigned ncomp, nir_intrinsic_op op)
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{
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nir_intrinsic_instr *load_size = nir_intrinsic_instr_create(b->shader, op);
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nir_ssa_dest_init(&load_size->instr, &load_size->dest, ncomp, 32, NULL);
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nir_builder_instr_insert(b, &load_size->instr);
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return &load_size->dest.ssa;
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}
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static nir_ssa_def *
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ir3_nir_lower_load_barycentric_at_offset_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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enum glsl_interp_mode interp_mode = nir_intrinsic_interp_mode(intr);
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#define chan(var, c) nir_channel(b, var, c)
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nir_ssa_def *off = intr->src[0].ssa;
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/* note: at_offset is defined to be relative to the center of the pixel */
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nir_ssa_def *ij = nir_load_barycentric_pixel(b, 32, .interp_mode = interp_mode);
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nir_ssa_def *s = load(b, 1, nir_intrinsic_load_persp_center_rhw_ir3);
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s = nir_frcp(b, s);
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/* scaled ij with s as 3rd component: */
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nir_ssa_def *sij =
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nir_vec3(b, nir_fmul(b, chan(ij, 0), s), nir_fmul(b, chan(ij, 1), s), s);
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nir_ssa_def *foo = nir_fddx(b, sij);
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nir_ssa_def *bar = nir_fddy(b, sij);
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if (b->shader->info.stage == MESA_SHADER_FRAGMENT)
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b->shader->info.fs.needs_quad_helper_invocations = true;
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nir_ssa_def *x, *y, *z, *i, *j;
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x = nir_ffma(b, chan(off, 0), chan(foo, 0), chan(sij, 0));
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y = nir_ffma(b, chan(off, 0), chan(foo, 1), chan(sij, 1));
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z = nir_ffma(b, chan(off, 0), chan(foo, 2), chan(sij, 2));
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x = nir_ffma(b, chan(off, 1), chan(bar, 0), x);
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y = nir_ffma(b, chan(off, 1), chan(bar, 1), y);
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z = nir_ffma(b, chan(off, 1), chan(bar, 2), z);
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/* convert back into primitive space: */
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z = nir_frcp(b, z);
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i = nir_fmul(b, z, x);
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j = nir_fmul(b, z, y);
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ij = nir_vec2(b, i, j);
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return ij;
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}
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static bool
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ir3_nir_lower_load_barycentric_at_offset_filter(const nir_instr *instr,
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const void *data)
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{
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return (instr->type == nir_instr_type_intrinsic &&
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nir_instr_as_intrinsic(instr)->intrinsic ==
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nir_intrinsic_load_barycentric_at_offset);
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}
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bool
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ir3_nir_lower_load_barycentric_at_offset(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_offset_filter,
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ir3_nir_lower_load_barycentric_at_offset_instr, NULL);
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}
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