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
27static void
28lower_impl(nir_function_impl *impl)
29{
30   nir_shader *shader = impl->function->shader;
31   nir_builder b;
32   nir_variable *in, *out;
33   nir_ssa_def *def;
34
35   nir_builder_init(&b, impl);
36   b.cursor = nir_before_cf_list(&impl->body);
37
38   in  = nir_variable_create(shader, nir_var_shader_in,
39                             glsl_vec4_type(), "edgeflag_in");
40   in->data.location = VERT_ATTRIB_EDGEFLAG;
41
42   out = nir_variable_create(shader, nir_var_shader_out,
43                             glsl_vec4_type(), "edgeflag_out");
44   out->data.location = VARYING_SLOT_EDGE;
45
46   def = nir_load_var(&b, in);
47   nir_store_var(&b, out, def, 0xf);
48
49   nir_metadata_preserve(impl, nir_metadata_block_index |
50                               nir_metadata_dominance);
51}
52
53void nir_lower_passthrough_edgeflags(nir_shader *shader)
54{
55   lower_impl(nir_shader_get_entrypoint(shader));
56}
57