text: /*
   * Copyright © 2016 Intel Corporation
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   * IN THE SOFTWARE.
   */
  
  #include "nir_builder.h"
  
  void
  nir_lower_tes_patch_vertices(nir_shader *tes_nir, unsigned patch_vertices)
  {
     nir_foreach_function(function, tes_nir) {
        if (function->impl) {
           nir_foreach_block(block, function->impl) {
              nir_builder b;
              nir_builder_init(&b, function->impl);
              nir_foreach_instr_safe(instr, block) {
                 if (instr->type == nir_instr_type_intrinsic) {
                    nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
                    if (intr->intrinsic != nir_intrinsic_load_patch_vertices_in)
                       continue;
  
                    b.cursor = nir_before_instr(&intr->instr);
                    nir_ssa_def *val = nir_imm_int(&b, patch_vertices);
                    nir_ssa_def_rewrite_uses(&intr->dest.ssa,
                                             nir_src_for_ssa(val));
                    nir_instr_remove(instr);
                 }
              }
           }
  
           nir_metadata_preserve(function->impl, nir_metadata_block_index |
                                                 nir_metadata_dominance);
        }
     }
  }
  