src/compiler/nir/nir_lower_patch_vertices.c

   1 /*
   2  * Copyright © 2016 Intel 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 #include "nir_builder.h"
  25
  26 void
  27 nir_lower_tes_patch_vertices(nir_shader *tes_nir, unsigned patch_vertices)
  28 {
  29    nir_foreach_function(function, tes_nir) {
  30       if (function->impl) {
  31          nir_foreach_block(block, function->impl) {
  32             nir_builder b;
  33             nir_builder_init(&b, function->impl);
  34             nir_foreach_instr_safe(instr, block) {
  35                if (instr->type == nir_instr_type_intrinsic) {
  36                   nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
  37                   if (intr->intrinsic != nir_intrinsic_load_patch_vertices_in)
  38                      continue;
  39
  40                   b.cursor = nir_before_instr(&intr->instr);
  41                   nir_ssa_def *val = nir_imm_int(&b, patch_vertices);
  42                   nir_ssa_def_rewrite_uses(&intr->dest.ssa,
  43                                            nir_src_for_ssa(val));
  44                   nir_instr_remove(instr);
  45                }
  46             }
  47          }
  48
  49          nir_metadata_preserve(function->impl, nir_metadata_block_index |
  50                                                nir_metadata_dominance);
  51       }
  52    }
  53 }