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.
27 #include "nir_builder.h"
28 #include "program/hash_table.h"
29 #include "compiler/glsl/ir_uniform.h"
31 #include "main/compiler.h"
32 #include "main/mtypes.h"
33 #include "program/prog_parameter.h"
34 #include "program/program.h"
36 /* Calculate the sampler index based on array indicies and also
37 * calculate the base uniform location for struct members.
40 calc_sampler_offsets(nir_deref
*tail
, nir_tex_instr
*instr
,
41 unsigned *array_elements
, nir_ssa_def
**indirect
,
42 nir_builder
*b
, unsigned *location
)
44 if (tail
->child
== NULL
)
47 switch (tail
->child
->deref_type
) {
48 case nir_deref_type_array
: {
49 nir_deref_array
*deref_array
= nir_deref_as_array(tail
->child
);
51 assert(deref_array
->deref_array_type
!= nir_deref_array_type_wildcard
);
53 calc_sampler_offsets(tail
->child
, instr
, array_elements
,
54 indirect
, b
, location
);
55 instr
->texture_index
+= deref_array
->base_offset
* *array_elements
;
57 if (deref_array
->deref_array_type
== nir_deref_array_type_indirect
) {
59 nir_imul(b
, nir_imm_int(b
, *array_elements
),
60 nir_ssa_for_src(b
, deref_array
->indirect
, 1));
62 nir_instr_rewrite_src(&instr
->instr
, &deref_array
->indirect
,
66 *indirect
= nir_iadd(b
, *indirect
, mul
);
72 *array_elements
*= glsl_get_length(tail
->type
);
76 case nir_deref_type_struct
: {
77 nir_deref_struct
*deref_struct
= nir_deref_as_struct(tail
->child
);
78 *location
+= glsl_get_record_location_offset(tail
->type
, deref_struct
->index
);
79 calc_sampler_offsets(tail
->child
, instr
, array_elements
,
80 indirect
, b
, location
);
85 unreachable("Invalid deref type");
91 lower_sampler(nir_tex_instr
*instr
, const struct gl_shader_program
*shader_program
,
92 gl_shader_stage stage
, nir_builder
*builder
)
94 if (instr
->texture
== NULL
)
97 /* In GLSL, we only fill out the texture field. The sampler is inferred */
98 assert(instr
->sampler
== NULL
);
100 instr
->texture_index
= 0;
101 unsigned location
= instr
->texture
->var
->data
.location
;
102 unsigned array_elements
= 1;
103 nir_ssa_def
*indirect
= NULL
;
105 builder
->cursor
= nir_before_instr(&instr
->instr
);
106 calc_sampler_offsets(&instr
->texture
->deref
, instr
, &array_elements
,
107 &indirect
, builder
, &location
);
110 /* First, we have to resize the array of texture sources */
111 nir_tex_src
*new_srcs
= rzalloc_array(instr
, nir_tex_src
,
112 instr
->num_srcs
+ 2);
114 for (unsigned i
= 0; i
< instr
->num_srcs
; i
++) {
115 new_srcs
[i
].src_type
= instr
->src
[i
].src_type
;
116 nir_instr_move_src(&instr
->instr
, &new_srcs
[i
].src
,
120 ralloc_free(instr
->src
);
121 instr
->src
= new_srcs
;
123 /* Now we can go ahead and move the source over to being a
124 * first-class texture source.
126 instr
->src
[instr
->num_srcs
].src_type
= nir_tex_src_texture_offset
;
128 nir_instr_rewrite_src(&instr
->instr
,
129 &instr
->src
[instr
->num_srcs
- 1].src
,
130 nir_src_for_ssa(indirect
));
132 instr
->src
[instr
->num_srcs
].src_type
= nir_tex_src_sampler_offset
;
134 nir_instr_rewrite_src(&instr
->instr
,
135 &instr
->src
[instr
->num_srcs
- 1].src
,
136 nir_src_for_ssa(indirect
));
138 instr
->texture_array_size
= array_elements
;
141 if (location
> shader_program
->NumUniformStorage
- 1 ||
142 !shader_program
->UniformStorage
[location
].opaque
[stage
].active
) {
143 assert(!"cannot return a sampler");
147 instr
->texture_index
+=
148 shader_program
->UniformStorage
[location
].opaque
[stage
].index
;
150 instr
->sampler_index
= instr
->texture_index
;
152 instr
->texture
= NULL
;
157 const struct gl_shader_program
*shader_program
;
158 gl_shader_stage stage
;
162 lower_block_cb(nir_block
*block
, void *_state
)
164 lower_state
*state
= (lower_state
*) _state
;
166 nir_foreach_instr(block
, instr
) {
167 if (instr
->type
== nir_instr_type_tex
) {
168 nir_tex_instr
*tex_instr
= nir_instr_as_tex(instr
);
169 lower_sampler(tex_instr
, state
->shader_program
, state
->stage
,
178 lower_impl(nir_function_impl
*impl
, const struct gl_shader_program
*shader_program
,
179 gl_shader_stage stage
)
183 nir_builder_init(&state
.builder
, impl
);
184 state
.shader_program
= shader_program
;
187 nir_foreach_block(impl
, lower_block_cb
, &state
);
191 nir_lower_samplers(nir_shader
*shader
,
192 const struct gl_shader_program
*shader_program
)
194 nir_foreach_function(shader
, function
) {
196 lower_impl(function
->impl
, shader_program
, shader
->stage
);