2 * Copyright © 2014 Intel Corporation
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:
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
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
24 * Connor Abbott (cwabbott0@gmail.com)
29 #include "nir_builder.h"
31 struct lower_system_values_state
{
37 convert_block(nir_block
*block
, void *void_state
)
39 struct lower_system_values_state
*state
= void_state
;
41 nir_builder
*b
= &state
->builder
;
43 nir_foreach_instr_safe(block
, instr
) {
44 if (instr
->type
!= nir_instr_type_intrinsic
)
47 nir_intrinsic_instr
*load_var
= nir_instr_as_intrinsic(instr
);
49 if (load_var
->intrinsic
!= nir_intrinsic_load_var
)
52 nir_variable
*var
= load_var
->variables
[0]->var
;
53 if (var
->data
.mode
!= nir_var_system_value
)
56 b
->cursor
= nir_after_instr(&load_var
->instr
);
59 switch (var
->data
.location
) {
60 case SYSTEM_VALUE_GLOBAL_INVOCATION_ID
: {
61 /* From the GLSL man page for gl_GlobalInvocationID:
63 * "The value of gl_GlobalInvocationID is equal to
64 * gl_WorkGroupID * gl_WorkGroupSize + gl_LocalInvocationID"
67 nir_const_value local_size
;
68 local_size
.u
[0] = b
->shader
->info
.cs
.local_size
[0];
69 local_size
.u
[1] = b
->shader
->info
.cs
.local_size
[1];
70 local_size
.u
[2] = b
->shader
->info
.cs
.local_size
[2];
72 nir_ssa_def
*group_id
=
73 nir_load_system_value(b
, nir_intrinsic_load_work_group_id
, 0);
74 nir_ssa_def
*local_id
=
75 nir_load_system_value(b
, nir_intrinsic_load_local_invocation_id
, 0);
77 sysval
= nir_iadd(b
, nir_imul(b
, group_id
,
78 nir_build_imm(b
, 3, local_size
)),
83 case SYSTEM_VALUE_LOCAL_INVOCATION_INDEX
: {
84 /* From the GLSL man page for gl_LocalInvocationIndex:
86 * ?The value of gl_LocalInvocationIndex is equal to
87 * gl_LocalInvocationID.z * gl_WorkGroupSize.x *
88 * gl_WorkGroupSize.y + gl_LocalInvocationID.y *
89 * gl_WorkGroupSize.x + gl_LocalInvocationID.x"
91 nir_ssa_def
*local_id
=
92 nir_load_system_value(b
, nir_intrinsic_load_local_invocation_id
, 0);
94 unsigned stride_y
= b
->shader
->info
.cs
.local_size
[0];
95 unsigned stride_z
= b
->shader
->info
.cs
.local_size
[0] *
96 b
->shader
->info
.cs
.local_size
[1];
98 sysval
= nir_iadd(b
, nir_imul(b
, nir_channel(b
, local_id
, 2),
99 nir_imm_int(b
, stride_z
)),
100 nir_iadd(b
, nir_imul(b
, nir_channel(b
, local_id
, 1),
101 nir_imm_int(b
, stride_y
)),
102 nir_channel(b
, local_id
, 0)));
106 case SYSTEM_VALUE_VERTEX_ID
:
107 if (b
->shader
->options
->vertex_id_zero_based
) {
109 nir_load_system_value(b
, nir_intrinsic_load_vertex_id_zero_base
, 0),
110 nir_load_system_value(b
, nir_intrinsic_load_base_vertex
, 0));
112 sysval
= nir_load_system_value(b
, nir_intrinsic_load_vertex_id
, 0);
116 case SYSTEM_VALUE_INSTANCE_INDEX
:
118 nir_load_system_value(b
, nir_intrinsic_load_instance_id
, 0),
119 nir_load_system_value(b
, nir_intrinsic_load_base_instance
, 0));
123 nir_intrinsic_op sysval_op
=
124 nir_intrinsic_from_system_value(var
->data
.location
);
125 sysval
= nir_load_system_value(b
, sysval_op
, 0);
130 nir_ssa_def_rewrite_uses(&load_var
->dest
.ssa
, nir_src_for_ssa(sysval
));
131 nir_instr_remove(&load_var
->instr
);
133 state
->progress
= true;
140 convert_impl(nir_function_impl
*impl
)
142 struct lower_system_values_state state
;
144 state
.progress
= false;
145 nir_builder_init(&state
.builder
, impl
);
147 nir_foreach_block(impl
, convert_block
, &state
);
148 nir_metadata_preserve(impl
, nir_metadata_block_index
|
149 nir_metadata_dominance
);
150 return state
.progress
;
154 nir_lower_system_values(nir_shader
*shader
)
156 bool progress
= false;
158 nir_foreach_function(shader
, function
) {
160 progress
= convert_impl(function
->impl
) || progress
;
163 exec_list_make_empty(&shader
->system_values
);