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 "../program.h"
28 #include "program/hash_table.h"
29 #include "ir_uniform.h"
32 #include "main/compiler.h"
33 #include "main/mtypes.h"
34 #include "program/prog_parameter.h"
35 #include "program/program.h"
39 get_sampler_index(struct gl_shader_program
*shader_program
, const char *name
,
40 const struct gl_program
*prog
)
42 GLuint shader
= _mesa_program_enum_to_shader_stage(prog
->Target
);
45 if (!shader_program
->UniformHash
->get(location
, name
)) {
46 linker_error(shader_program
,
47 "failed to find sampler named %s.\n", name
);
51 if (!shader_program
->UniformStorage
[location
].sampler
[shader
].active
) {
52 assert(0 && "cannot return a sampler");
53 linker_error(shader_program
,
54 "cannot return a sampler named %s, because it is not "
55 "used in this shader stage. This is a driver bug.\n",
60 return shader_program
->UniformStorage
[location
].sampler
[shader
].index
;
64 lower_sampler(nir_tex_instr
*instr
, struct gl_shader_program
*shader_program
,
65 const struct gl_program
*prog
, void *mem_ctx
)
67 if (instr
->sampler
== NULL
)
70 /* Get the name and the offset */
71 instr
->sampler_index
= 0;
72 char *name
= ralloc_strdup(mem_ctx
, instr
->sampler
->var
->name
);
74 for (nir_deref
*deref
= &instr
->sampler
->deref
;
75 deref
->child
; deref
= deref
->child
) {
76 switch (deref
->child
->deref_type
) {
77 case nir_deref_type_array
: {
78 nir_deref_array
*deref_array
= nir_deref_as_array(deref
->child
);
80 /* XXX: We're assuming here that the indirect is the last array
81 * thing we have. This should be ok for now as we don't support
82 * arrays_of_arrays yet.
85 instr
->sampler_index
*= glsl_get_length(deref
->type
);
86 switch (deref_array
->deref_array_type
) {
87 case nir_deref_array_type_direct
:
88 instr
->sampler_index
+= deref_array
->base_offset
;
89 if (deref_array
->deref
.child
)
90 ralloc_asprintf_append(&name
, "[%u]", deref_array
->base_offset
);
92 case nir_deref_array_type_indirect
: {
93 instr
->src
= reralloc(instr
, instr
->src
, nir_tex_src
,
95 memset(&instr
->src
[instr
->num_srcs
], 0, sizeof *instr
->src
);
96 instr
->src
[instr
->num_srcs
].src_type
= nir_tex_src_sampler_offset
;
99 nir_instr_rewrite_src(&instr
->instr
,
100 &instr
->src
[instr
->num_srcs
- 1].src
,
101 deref_array
->indirect
);
103 instr
->sampler_array_size
= glsl_get_length(deref
->type
);
106 memset(&empty
, 0, sizeof empty
);
107 nir_instr_rewrite_src(&instr
->instr
, &deref_array
->indirect
, empty
);
109 if (deref_array
->deref
.child
)
110 ralloc_strcat(&name
, "[0]");
114 case nir_deref_array_type_wildcard
:
115 unreachable("Cannot copy samplers");
117 unreachable("Invalid deref array type");
122 case nir_deref_type_struct
: {
123 nir_deref_struct
*deref_struct
= nir_deref_as_struct(deref
->child
);
124 const char *field
= glsl_get_struct_elem_name(deref
->type
,
125 deref_struct
->index
);
126 ralloc_asprintf_append(&name
, ".%s", field
);
131 unreachable("Invalid deref type");
136 instr
->sampler_index
+= get_sampler_index(shader_program
, name
, prog
);
138 instr
->sampler
= NULL
;
143 struct gl_shader_program
*shader_program
;
144 struct gl_program
*prog
;
148 lower_block_cb(nir_block
*block
, void *_state
)
150 lower_state
*state
= (lower_state
*) _state
;
152 nir_foreach_instr(block
, instr
) {
153 if (instr
->type
== nir_instr_type_tex
) {
154 nir_tex_instr
*tex_instr
= nir_instr_as_tex(instr
);
155 lower_sampler(tex_instr
, state
->shader_program
, state
->prog
,
164 lower_impl(nir_function_impl
*impl
, struct gl_shader_program
*shader_program
,
165 struct gl_program
*prog
)
169 state
.mem_ctx
= ralloc_parent(impl
);
170 state
.shader_program
= shader_program
;
173 nir_foreach_block(impl
, lower_block_cb
, &state
);
177 nir_lower_samplers(nir_shader
*shader
, struct gl_shader_program
*shader_program
,
178 struct gl_program
*prog
)
180 nir_foreach_overload(shader
, overload
) {
182 lower_impl(overload
->impl
, shader_program
, prog
);