1/*
2 * Copyright © 2015 Red Hat
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 FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24
25#include "nir.h"
26#include "nir_builder.h"
27
28static bool
29lower_input(nir_shader *shader, nir_variable *var)
30{
31   if (var->data.interpolation == INTERP_MODE_NONE &&
32       (var->data.location == VARYING_SLOT_COL0 ||
33        var->data.location == VARYING_SLOT_COL1 ||
34        var->data.location == VARYING_SLOT_BFC0 ||
35        var->data.location == VARYING_SLOT_BFC1))
36      var->data.interpolation = INTERP_MODE_FLAT;
37   return true;
38}
39
40bool
41nir_lower_flatshade(nir_shader *shader)
42{
43   bool progress = false;
44
45   nir_foreach_shader_in_variable(var, shader) {
46      progress |= lower_input(shader, var);
47   }
48
49   return progress;
50}
51