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82 lines
3 KiB
C
82 lines
3 KiB
C
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/*
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* Copyright (C) 2019 Andreas Baierl
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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_builder.h"
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/* Lower gl_FragCoord and transform the w component
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* according to the following pseudocode:
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*
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* gl_FragCoord.xyz = gl_FragCoord_orig.xyz
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* gl_FragCoord.w = 1.0 / gl_FragCoord_orig.w
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*
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* To trigger the transformation, gl_FragCoord currently has to be treated
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* as a system value with PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL enabled.
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*/
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static void
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lower_fragcoord_wtrans(nir_builder *b, nir_intrinsic_instr *intr)
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{
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assert(intr->dest.is_ssa);
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b->cursor = nir_before_instr(&intr->instr);
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nir_ssa_def *fragcoord_in = nir_load_frag_coord(b);
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nir_ssa_def *w_rcp = nir_frcp(b, nir_channel(b, fragcoord_in, 3));
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nir_ssa_def *fragcoord_wtrans = nir_vec4(b,
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nir_channel(b, fragcoord_in, 0),
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nir_channel(b, fragcoord_in, 1),
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nir_channel(b, fragcoord_in, 2),
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w_rcp);
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nir_ssa_def_rewrite_uses(&intr->dest.ssa,
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nir_src_for_ssa(fragcoord_wtrans));
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}
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void
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nir_lower_fragcoord_wtrans(nir_shader *shader)
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{
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assert(shader->info.stage == MESA_SHADER_FRAGMENT);
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nir_foreach_function(func, shader) {
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if (!func->impl)
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continue;
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nir_builder b;
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nir_builder_init(&b, func->impl);
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nir_foreach_block(block, func->impl) {
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nir_foreach_instr_safe(instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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if (intr->intrinsic != nir_intrinsic_load_frag_coord)
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continue;
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lower_fragcoord_wtrans(&b, intr);
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}
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}
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nir_metadata_preserve(func->impl, nir_metadata_block_index |
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nir_metadata_dominance);
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}
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}
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