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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
nir_lower_tes_patch_vertices(nir_shader * tes_nir,unsigned patch_vertices)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 }
54