1 /*
2 * Copyright © 2013 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 "brw_compiler.h"
25 #include "compiler/nir/nir.h"
26
get_qual_name(int mode)27 static char const *get_qual_name(int mode)
28 {
29 switch (mode) {
30 case INTERP_MODE_NONE: return "none";
31 case INTERP_MODE_FLAT: return "flat";
32 case INTERP_MODE_SMOOTH: return "smooth";
33 case INTERP_MODE_NOPERSPECTIVE: return "nopersp";
34 default: return "???";
35 }
36 }
37
38 static void
gen4_frag_prog_set_interp_modes(struct brw_wm_prog_data * prog_data,struct brw_vue_map * vue_map,unsigned location,unsigned slot_count,enum glsl_interp_mode interp)39 gen4_frag_prog_set_interp_modes(struct brw_wm_prog_data *prog_data,
40 struct brw_vue_map *vue_map,
41 unsigned location, unsigned slot_count,
42 enum glsl_interp_mode interp)
43 {
44 for (unsigned k = 0; k < slot_count; k++) {
45 unsigned slot = vue_map->varying_to_slot[location + k];
46 if (slot != -1 && prog_data->interp_mode[slot] == INTERP_MODE_NONE) {
47 prog_data->interp_mode[slot] = interp;
48
49 if (prog_data->interp_mode[slot] == INTERP_MODE_FLAT) {
50 prog_data->contains_flat_varying = true;
51 } else if (prog_data->interp_mode[slot] == INTERP_MODE_NOPERSPECTIVE) {
52 prog_data->contains_noperspective_varying = true;
53 }
54 }
55 }
56 }
57
58 /* Set up interpolation modes for every element in the VUE */
59 void
brw_setup_vue_interpolation(struct brw_vue_map * vue_map,nir_shader * nir,struct brw_wm_prog_data * prog_data)60 brw_setup_vue_interpolation(struct brw_vue_map *vue_map, nir_shader *nir,
61 struct brw_wm_prog_data *prog_data)
62 {
63 /* Initialise interp_mode. INTERP_MODE_NONE == 0 */
64 memset(prog_data->interp_mode, 0, sizeof(prog_data->interp_mode));
65
66 if (!vue_map)
67 return;
68
69 /* HPOS always wants noperspective. setting it up here allows
70 * us to not need special handling in the SF program.
71 */
72 unsigned pos_slot = vue_map->varying_to_slot[VARYING_SLOT_POS];
73 if (pos_slot != -1) {;
74 prog_data->interp_mode[pos_slot] = INTERP_MODE_NOPERSPECTIVE;
75 prog_data->contains_noperspective_varying = true;
76 }
77
78 nir_foreach_shader_in_variable(var, nir) {
79 unsigned location = var->data.location;
80 unsigned slot_count = glsl_count_attribute_slots(var->type, false);
81
82 gen4_frag_prog_set_interp_modes(prog_data, vue_map, location, slot_count,
83 var->data.interpolation);
84
85 if (location == VARYING_SLOT_COL0 || location == VARYING_SLOT_COL1) {
86 location = location + VARYING_SLOT_BFC0 - VARYING_SLOT_COL0;
87 gen4_frag_prog_set_interp_modes(prog_data, vue_map, location,
88 slot_count, var->data.interpolation);
89 }
90 }
91
92 const bool debug = false;
93 if (debug) {
94 fprintf(stderr, "VUE map:\n");
95 for (int i = 0; i < vue_map->num_slots; i++) {
96 int varying = vue_map->slot_to_varying[i];
97 if (varying == -1) {
98 fprintf(stderr, "%d: --\n", i);
99 continue;
100 }
101
102 fprintf(stderr, "%d: %d %s ofs %d\n",
103 i, varying,
104 get_qual_name(prog_data->interp_mode[i]),
105 brw_vue_slot_to_offset(i));
106 }
107 }
108 }
109