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65d32b96cf
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32173>
80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/*
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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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*/
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static bool
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lower_fragcoord_wtrans(nir_builder *b, nir_intrinsic_instr *intr,
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UNUSED void *_options)
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{
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switch (intr->intrinsic) {
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case nir_intrinsic_load_deref: {
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nir_deref_instr *deref = nir_src_as_deref(intr->src[0]);
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if (!nir_deref_mode_must_be(deref, nir_var_shader_in))
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return false;
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nir_variable *var = nir_intrinsic_get_var(intr, 0);
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if (var->data.location != VARYING_SLOT_POS)
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return false;
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break;
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}
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case nir_intrinsic_load_frag_coord:
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break;
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default:
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return false;
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}
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/* W is not read. */
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if (intr->def.num_components < 4)
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return false;
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b->cursor = nir_after_instr(&intr->instr);
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nir_def *invert = nir_frcp(b, nir_channel(b, &intr->def, 3));
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nir_def *frag_coord = nir_vector_insert_imm(b, &intr->def, invert, 3);
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nir_def_rewrite_uses_after(&intr->def, frag_coord,
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frag_coord->parent_instr);
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return true;
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}
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bool
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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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return nir_shader_intrinsics_pass(shader,
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lower_fragcoord_wtrans,
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nir_metadata_control_flow,
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NULL);
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}
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