117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/*
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* Copyright © 2015 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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* Authors:
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* Jason Ekstrand <jason@jlekstrand.net>
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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 file implements a NIR lowering pass to perform the normalization of
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* the cubemap coordinates to have the largest magnitude component be -1.0
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* or 1.0. This is based on the old GLSL IR based pass by Eric.
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*/
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static bool
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normalize_cubemap_coords_block(nir_block *block, nir_builder *b)
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{
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bool progress = false;
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nir_foreach_instr(instr, block) {
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if (instr->type != nir_instr_type_tex)
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continue;
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nir_tex_instr *tex = nir_instr_as_tex(instr);
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if (tex->sampler_dim != GLSL_SAMPLER_DIM_CUBE)
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continue;
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b->cursor = nir_before_instr(&tex->instr);
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for (unsigned i = 0; i < tex->num_srcs; i++) {
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if (tex->src[i].src_type != nir_tex_src_coord)
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continue;
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nir_ssa_def *orig_coord =
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nir_ssa_for_src(b, tex->src[i].src, nir_tex_instr_src_size(tex, i));
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assert(orig_coord->num_components >= 3);
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nir_ssa_def *abs = nir_fabs(b, orig_coord);
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nir_ssa_def *norm = nir_fmax(b, nir_channel(b, abs, 0),
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nir_fmax(b, nir_channel(b, abs, 1),
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nir_channel(b, abs, 2)));
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nir_ssa_def *normalized = nir_fmul(b, orig_coord, nir_frcp(b, norm));
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/* Array indices don't have to be normalized, so make a new vector
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* with the coordinate's array index untouched.
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*/
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if (tex->coord_components == 4) {
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normalized = nir_vec4(b,
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nir_channel(b, normalized, 0),
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nir_channel(b, normalized, 1),
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nir_channel(b, normalized, 2),
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nir_channel(b, orig_coord, 3));
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}
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nir_instr_rewrite_src(&tex->instr,
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&tex->src[i].src,
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nir_src_for_ssa(normalized));
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progress = true;
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}
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}
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return progress;
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}
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static bool
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normalize_cubemap_coords_impl(nir_function_impl *impl)
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{
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nir_builder b;
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nir_builder_init(&b, impl);
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bool progress = false;
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nir_foreach_block(block, impl) {
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progress |= normalize_cubemap_coords_block(block, &b);
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}
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nir_metadata_preserve(impl, nir_metadata_block_index |
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nir_metadata_dominance);
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return progress;
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}
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bool
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nir_normalize_cubemap_coords(nir_shader *shader)
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{
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bool progress = false;
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nir_foreach_function(function, shader) {
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if (function->impl)
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progress = normalize_cubemap_coords_impl(function->impl) || progress;
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}
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return progress;
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}
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