1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/*
* Copyright © 2021 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "nir.h"
#include "nir_builder.h"
static bool
lower_single_sampled_instr(nir_builder *b,
nir_instr *instr,
UNUSED void *cb_data)
{
if (instr->type != nir_instr_type_intrinsic)
return false;
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
nir_ssa_def *lowered;
switch (intrin->intrinsic) {
case nir_intrinsic_load_sample_id:
b->cursor = nir_before_instr(instr);
lowered = nir_imm_int(b, 0);
break;
case nir_intrinsic_load_sample_pos:
b->cursor = nir_before_instr(instr);
lowered = nir_imm_vec2(b, 0.5, 0.5);
break;
case nir_intrinsic_load_sample_mask_in:
/* Don't lower to helper invocations if helper invocations are going
* to be lowered right back to sample mask.
*/
if (b->shader->options->lower_helper_invocation)
return false;
b->cursor = nir_before_instr(instr);
lowered = nir_b2i32(b, nir_inot(b, nir_load_helper_invocation(b, 1)));
break;
case nir_intrinsic_interp_deref_at_centroid:
case nir_intrinsic_interp_deref_at_sample:
b->cursor = nir_before_instr(instr);
assert(intrin->src[0].is_ssa);
lowered = nir_load_deref(b, nir_src_as_deref(intrin->src[0]));
break;
case nir_intrinsic_load_barycentric_centroid:
case nir_intrinsic_load_barycentric_sample:
case nir_intrinsic_load_barycentric_at_sample:
b->cursor = nir_before_instr(instr);
lowered = nir_load_barycentric(b, nir_intrinsic_load_barycentric_pixel,
nir_intrinsic_interp_mode(intrin));
if (nir_intrinsic_interp_mode(intrin) == INTERP_MODE_NOPERSPECTIVE) {
BITSET_SET(b->shader->info.system_values_read,
SYSTEM_VALUE_BARYCENTRIC_LINEAR_PIXEL);
} else {
BITSET_SET(b->shader->info.system_values_read,
SYSTEM_VALUE_BARYCENTRIC_PERSP_PIXEL);
}
break;
default:
return false;
}
nir_ssa_def_rewrite_uses(&intrin->dest.ssa, lowered);
nir_instr_remove(instr);
return true;
}
/* Assume the fragment shader is single-sampled and lower accordingly
*
* This drops sample/centroid qualifiers from all input variables, forces
* barycentrics to pixel, and constant-folds various built-ins.
*/
bool
nir_lower_single_sampled(nir_shader *shader)
{
assert(shader->info.stage == MESA_SHADER_FRAGMENT);
bool progress = false;
nir_foreach_shader_in_variable(var, shader) {
if (var->data.sample) {
var->data.sample = false;
progress = true;
}
if (var->data.centroid) {
var->data.centroid = false;
progress = true;
}
}
/* We're going to get rid of any uses of these */
BITSET_CLEAR(shader->info.system_values_read,
SYSTEM_VALUE_BARYCENTRIC_PERSP_SAMPLE);
BITSET_CLEAR(shader->info.system_values_read,
SYSTEM_VALUE_BARYCENTRIC_PERSP_CENTROID);
BITSET_CLEAR(shader->info.system_values_read,
SYSTEM_VALUE_BARYCENTRIC_LINEAR_SAMPLE);
BITSET_CLEAR(shader->info.system_values_read,
SYSTEM_VALUE_BARYCENTRIC_LINEAR_CENTROID);
return nir_shader_instructions_pass(shader, lower_single_sampled_instr,
nir_metadata_block_index |
nir_metadata_dominance,
NULL) || progress;
}
|
