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
check_location(int location)28 check_location(int location)
29 {
30 return location == VARYING_SLOT_COL0 ||
31 location == VARYING_SLOT_COL1 ||
32 location == VARYING_SLOT_BFC0 ||
33 location == VARYING_SLOT_BFC1;
34 }
35
36 static bool
lower_input_io(nir_builder * b,nir_intrinsic_instr * intr,void * data)37 lower_input_io(nir_builder *b, nir_intrinsic_instr *intr, void *data)
38 {
39 if (intr->intrinsic != nir_intrinsic_load_interpolated_input)
40 return false;;
41 nir_io_semantics sem = nir_intrinsic_io_semantics(intr);
42 if (!check_location(sem.location))
43 return false;
44 nir_def *interp = intr->src[0].ssa;
45 nir_intrinsic_instr *interp_intr = nir_instr_as_intrinsic(interp->parent_instr);
46 if (nir_intrinsic_interp_mode(interp_intr) != INTERP_MODE_NONE)
47 return false;
48 b->cursor = nir_before_instr(&intr->instr);
49 nir_def *load = nir_load_input(b, intr->num_components,
50 intr->def.bit_size, intr->src[1].ssa);
51 nir_intrinsic_instr *new_intr = nir_instr_as_intrinsic(load->parent_instr);
52 nir_intrinsic_copy_const_indices(new_intr, intr);
53 nir_def_replace(&intr->def, load);
54 return true;
55 }
56
57 bool
nir_lower_flatshade(nir_shader * shader)58 nir_lower_flatshade(nir_shader *shader)
59 {
60 assert(shader->info.io_lowered);
61 return nir_shader_intrinsics_pass(shader, lower_input_io, nir_metadata_all,
62 NULL);
63 }
64