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 #include "nir.h"
25 #include "nir_builder.h"
26
27 static bool
lower_input(nir_shader * shader,nir_variable * var)28 lower_input(nir_shader *shader, nir_variable *var)
29 {
30 if (var->data.interpolation == INTERP_MODE_NONE &&
31 (var->data.location == VARYING_SLOT_COL0 ||
32 var->data.location == VARYING_SLOT_COL1 ||
33 var->data.location == VARYING_SLOT_BFC0 ||
34 var->data.location == VARYING_SLOT_BFC1))
35 var->data.interpolation = INTERP_MODE_FLAT;
36 return true;
37 }
38
39 bool
nir_lower_flatshade(nir_shader * shader)40 nir_lower_flatshade(nir_shader *shader)
41 {
42 bool progress = false;
43
44 nir_foreach_shader_in_variable(var, shader) {
45 progress |= lower_input(shader, var);
46 }
47
48 /* Interpolation doesn't affect any metadata */
49 nir_shader_preserve_all_metadata(shader);
50 return progress;
51 }
52