2 * Copyright (C) 2005-2007 Brian Paul All Rights Reserved.
3 * Copyright (C) 2008 VMware, Inc. All Rights Reserved.
4 * Copyright © 2014 Intel Corporation
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 * DEALINGS IN THE SOFTWARE.
26 #include "compiler/nir/nir.h"
27 #include "compiler/nir/nir_builder.h"
29 #include "ir_uniform.h"
31 #include "main/compiler.h"
32 #include "main/mtypes.h"
35 lower_tex_src_to_offset(nir_builder
*b
,
36 nir_tex_instr
*instr
, unsigned src_idx
,
37 const struct gl_shader_program
*shader_program
)
39 nir_ssa_def
*index
= NULL
;
40 unsigned base_index
= 0;
41 unsigned array_elements
= 1;
42 nir_tex_src
*src
= &instr
->src
[src_idx
];
43 bool is_sampler
= src
->src_type
== nir_tex_src_sampler_deref
;
44 unsigned location
= 0;
46 /* We compute first the offsets */
47 nir_deref_instr
*deref
= nir_instr_as_deref(src
->src
.ssa
->parent_instr
);
48 while (deref
->deref_type
!= nir_deref_type_var
) {
49 assert(deref
->parent
.is_ssa
);
50 nir_deref_instr
*parent
=
51 nir_instr_as_deref(deref
->parent
.ssa
->parent_instr
);
53 switch (deref
->deref_type
) {
54 case nir_deref_type_struct
:
55 location
+= glsl_get_record_location_offset(parent
->type
,
59 case nir_deref_type_array
: {
60 if (nir_src_is_const(deref
->arr
.index
) && index
== NULL
) {
61 /* We're still building a direct index */
62 base_index
+= nir_src_as_uint(deref
->arr
.index
) * array_elements
;
65 /* We used to be direct but not anymore */
66 index
= nir_imm_int(b
, base_index
);
70 index
= nir_iadd(b
, index
,
71 nir_imul(b
, nir_imm_int(b
, array_elements
),
72 nir_ssa_for_src(b
, deref
->arr
.index
, 1)));
75 array_elements
*= glsl_get_length(parent
->type
);
80 unreachable("Invalid sampler deref type");
87 index
= nir_umin(b
, index
, nir_imm_int(b
, array_elements
- 1));
89 /* We hit the deref_var. This is the end of the line */
90 assert(deref
->deref_type
== nir_deref_type_var
);
92 location
+= deref
->var
->data
.location
;
94 gl_shader_stage stage
= b
->shader
->info
.stage
;
95 assert(location
< shader_program
->data
->NumUniformStorage
&&
96 shader_program
->data
->UniformStorage
[location
].opaque
[stage
].active
);
99 shader_program
->data
->UniformStorage
[location
].opaque
[stage
].index
;
101 /* We have the offsets, we apply them, rewriting the source or removing
105 nir_instr_rewrite_src(&instr
->instr
, &src
->src
,
106 nir_src_for_ssa(index
));
108 src
->src_type
= is_sampler
?
109 nir_tex_src_sampler_offset
:
110 nir_tex_src_texture_offset
;
112 instr
->texture_array_size
= array_elements
;
114 nir_tex_instr_remove_src(instr
, src_idx
);
118 instr
->sampler_index
= base_index
;
120 instr
->texture_index
= base_index
;
121 instr
->texture_array_size
= array_elements
;
126 lower_sampler(nir_builder
*b
, nir_tex_instr
*instr
,
127 const struct gl_shader_program
*shader_program
)
130 nir_tex_instr_src_index(instr
, nir_tex_src_texture_deref
);
132 if (texture_idx
>= 0) {
133 b
->cursor
= nir_before_instr(&instr
->instr
);
135 lower_tex_src_to_offset(b
, instr
, texture_idx
,
140 nir_tex_instr_src_index(instr
, nir_tex_src_sampler_deref
);
142 if (sampler_idx
>= 0) {
143 lower_tex_src_to_offset(b
, instr
, sampler_idx
,
147 if (texture_idx
< 0 && sampler_idx
< 0)
154 lower_impl(nir_function_impl
*impl
,
155 const struct gl_shader_program
*shader_program
)
158 nir_builder_init(&b
, impl
);
159 bool progress
= false;
161 nir_foreach_block(block
, impl
) {
162 nir_foreach_instr(instr
, block
) {
163 if (instr
->type
== nir_instr_type_tex
)
164 progress
|= lower_sampler(&b
, nir_instr_as_tex(instr
),
173 gl_nir_lower_samplers(nir_shader
*shader
,
174 const struct gl_shader_program
*shader_program
)
176 bool progress
= false;
178 nir_foreach_function(function
, shader
) {
180 progress
|= lower_impl(function
->impl
, shader_program
);