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Member "mesa-20.1.8/src/compiler/nir/nir_lower_discard_to_demote.c" (16 Sep 2020, 2635 Bytes) of package /linux/misc/mesa-20.1.8.tar.xz:


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    1 /*
    2  * Copyright © 2020 Valve Corporation
    3  *
    4  * Permission is hereby granted, free of charge, to any person obtaining a
    5  * copy of this software and associated documentation files (the "Software"),
    6  * to deal in the Software without restriction, including without limitation
    7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
    8  * and/or sell copies of the Software, and to permit persons to whom the
    9  * Software is furnished to do so, subject to the following conditions:
   10  *
   11  * The above copyright notice and this permission notice (including the next
   12  * paragraph) shall be included in all copies or substantial portions of the
   13  * Software.
   14  *
   15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   21  * IN THE SOFTWARE.
   22  *
   23  */
   24 
   25 #include "nir.h"
   26 
   27 /**
   28  * This pass is intended as workaround for game bugs to force correct
   29  * derivatives after kill. This lowering is not valid in the general case
   30  * as it might change the result of subgroup operations and loop behavior.
   31  *
   32  * discard() will be lowered as demote() and gl_HelperInvocation
   33  * will be lowered as helperInvocationEXT().
   34  */
   35 bool
   36 nir_lower_discard_to_demote(nir_shader *shader)
   37 {
   38    if (shader->info.stage != MESA_SHADER_FRAGMENT)
   39       return false;
   40 
   41    bool progress = false;
   42 
   43    nir_foreach_function(function, shader) {
   44       nir_foreach_block(block, function->impl) {
   45          nir_foreach_instr(instr, block) {
   46             if (instr->type != nir_instr_type_intrinsic)
   47                continue;
   48 
   49             nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
   50             switch (intrin->intrinsic) {
   51             case nir_intrinsic_discard:
   52                intrin->intrinsic = nir_intrinsic_demote;
   53                shader->info.fs.uses_demote = true;
   54                break;
   55             case nir_intrinsic_discard_if:
   56                intrin->intrinsic = nir_intrinsic_demote_if;
   57                shader->info.fs.uses_demote = true;
   58                break;
   59             case nir_intrinsic_load_helper_invocation:
   60                intrin->intrinsic = nir_intrinsic_is_helper_invocation;
   61                break;
   62             default:
   63                continue;
   64             }
   65             progress = true;
   66          }
   67       }
   68    }
   69 
   70    return progress;
   71 }