96 lines
3.4 KiB
C
96 lines
3.4 KiB
C
/*
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* Copyright © 2021 Intel Corporation
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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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/**
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* This lowering pass supports (as configured via nir_lower_image_options)
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* image related conversions:
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* + cube array size lowering. The size operation is converted from cube
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* size to a 2d-array with the z component divided by 6.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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static void
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lower_cube_size(nir_builder *b, nir_intrinsic_instr *intrin)
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{
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assert(nir_intrinsic_image_dim(intrin) == GLSL_SAMPLER_DIM_CUBE);
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b->cursor = nir_before_instr(&intrin->instr);
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nir_intrinsic_instr *_2darray_size =
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nir_instr_as_intrinsic(nir_instr_clone(b->shader, &intrin->instr));
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nir_intrinsic_set_image_dim(_2darray_size, GLSL_SAMPLER_DIM_2D);
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nir_intrinsic_set_image_array(_2darray_size, true);
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nir_builder_instr_insert(b, &_2darray_size->instr);
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nir_ssa_def *size = nir_instr_ssa_def(&_2darray_size->instr);
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nir_ssa_scalar comps[NIR_MAX_VEC_COMPONENTS] = { 0 };
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unsigned coord_comps = intrin->dest.ssa.num_components;
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for (unsigned c = 0; c < coord_comps; c++) {
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if (c == 2) {
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comps[2] = nir_get_ssa_scalar(nir_idiv(b, nir_channel(b, size, 2), nir_imm_int(b, 6)), 0);
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} else {
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comps[c] = nir_get_ssa_scalar(size, c);
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}
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}
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nir_ssa_def *vec = nir_vec_scalars(b, comps, intrin->dest.ssa.num_components);
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nir_ssa_def_rewrite_uses(&intrin->dest.ssa, vec);
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nir_instr_remove(&intrin->instr);
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nir_instr_free(&intrin->instr);
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}
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static bool
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lower_image_instr(nir_builder *b, nir_instr *instr, void *state)
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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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const nir_lower_image_options *options = state;
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nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
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switch (intrin->intrinsic) {
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case nir_intrinsic_image_size:
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case nir_intrinsic_image_deref_size:
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case nir_intrinsic_bindless_image_size:
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if (options->lower_cube_size &&
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nir_intrinsic_image_dim(intrin) == GLSL_SAMPLER_DIM_CUBE) {
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lower_cube_size(b, intrin);
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return true;
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}
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return false;
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default:
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return false;
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}
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}
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bool
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nir_lower_image(nir_shader *nir, const nir_lower_image_options *options)
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{
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return nir_shader_instructions_pass(nir, lower_image_instr,
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nir_metadata_block_index |
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nir_metadata_dominance, (void*)options);
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}
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