mirror of https://gitlab.freedesktop.org/mesa/mesa
75 lines
2.6 KiB
C
75 lines
2.6 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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#include "nir.h"
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#include "nir_builtin_builder.h"
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/*
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* Lower cubemap coordinate to have normalized coordinates where the largest
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* magnitude component is -1.0 or 1.0.
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*/
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static bool
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normalize_cubemap_coords(nir_builder *b, nir_instr *instr, void *data)
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{
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if (instr->type != nir_instr_type_tex)
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return false;
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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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return false;
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b->cursor = nir_before_instr(instr);
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int idx = nir_tex_instr_src_index(tex, nir_tex_src_coord);
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if (idx < 0)
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return false;
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nir_def *orig_coord =
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tex->src[idx].src.ssa;
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assert(orig_coord->num_components >= 3);
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nir_def *orig_xyz = nir_trim_vector(b, orig_coord, 3);
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nir_def *norm = nir_fmax_abs_vec_comp(b, orig_xyz);
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nir_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_vector_insert_imm(b, normalized,
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nir_channel(b, orig_coord, 3), 3);
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}
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nir_src_rewrite(&tex->src[idx].src, normalized);
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return true;
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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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return nir_shader_instructions_pass(shader, normalize_cubemap_coords,
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nir_metadata_block_index |
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nir_metadata_dominance,
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NULL);
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}
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