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)
25 * Jason Ekstrand (jason@jlekstrand.net)
30 * This lowering pass converts references to input/output variables with
31 * loads/stores to actual input/output intrinsics.
35 #include "nir_builder.h"
37 struct lower_io_state
{
40 int (*type_size
)(const struct glsl_type
*type
);
41 nir_variable_mode mode
;
45 nir_assign_var_locations(struct exec_list
*var_list
, unsigned *size
,
46 int (*type_size
)(const struct glsl_type
*))
48 unsigned location
= 0;
50 nir_foreach_variable(var
, var_list
) {
52 * UBO's have their own address spaces, so don't count them towards the
53 * number of global uniforms
55 if ((var
->data
.mode
== nir_var_uniform
|| var
->data
.mode
== nir_var_shader_storage
) &&
56 var
->interface_type
!= NULL
)
59 var
->data
.driver_location
= location
;
60 location
+= type_size(var
->type
);
67 * Returns true if we're processing a stage whose inputs are arrays indexed
68 * by a vertex number (such as geometry shader inputs).
71 is_per_vertex_input(struct lower_io_state
*state
, nir_variable
*var
)
73 gl_shader_stage stage
= state
->builder
.shader
->stage
;
75 return var
->data
.mode
== nir_var_shader_in
&& !var
->data
.patch
&&
76 (stage
== MESA_SHADER_TESS_CTRL
||
77 stage
== MESA_SHADER_TESS_EVAL
||
78 stage
== MESA_SHADER_GEOMETRY
);
82 is_per_vertex_output(struct lower_io_state
*state
, nir_variable
*var
)
84 gl_shader_stage stage
= state
->builder
.shader
->stage
;
85 return var
->data
.mode
== nir_var_shader_out
&& !var
->data
.patch
&&
86 stage
== MESA_SHADER_TESS_CTRL
;
90 get_io_offset(nir_builder
*b
, nir_deref_var
*deref
,
91 nir_ssa_def
**vertex_index
,
92 int (*type_size
)(const struct glsl_type
*))
94 nir_deref
*tail
= &deref
->deref
;
96 /* For per-vertex input arrays (i.e. geometry shader inputs), keep the
97 * outermost array index separate. Process the rest normally.
99 if (vertex_index
!= NULL
) {
101 assert(tail
->deref_type
== nir_deref_type_array
);
102 nir_deref_array
*deref_array
= nir_deref_as_array(tail
);
104 nir_ssa_def
*vtx
= nir_imm_int(b
, deref_array
->base_offset
);
105 if (deref_array
->deref_array_type
== nir_deref_array_type_indirect
) {
106 vtx
= nir_iadd(b
, vtx
, nir_ssa_for_src(b
, deref_array
->indirect
, 1));
111 /* Just emit code and let constant-folding go to town */
112 nir_ssa_def
*offset
= nir_imm_int(b
, 0);
114 while (tail
->child
!= NULL
) {
115 const struct glsl_type
*parent_type
= tail
->type
;
118 if (tail
->deref_type
== nir_deref_type_array
) {
119 nir_deref_array
*deref_array
= nir_deref_as_array(tail
);
120 unsigned size
= type_size(tail
->type
);
122 offset
= nir_iadd(b
, offset
,
123 nir_imm_int(b
, size
* deref_array
->base_offset
));
125 if (deref_array
->deref_array_type
== nir_deref_array_type_indirect
) {
127 nir_imul(b
, nir_imm_int(b
, size
),
128 nir_ssa_for_src(b
, deref_array
->indirect
, 1));
130 offset
= nir_iadd(b
, offset
, mul
);
132 } else if (tail
->deref_type
== nir_deref_type_struct
) {
133 nir_deref_struct
*deref_struct
= nir_deref_as_struct(tail
);
135 unsigned field_offset
= 0;
136 for (unsigned i
= 0; i
< deref_struct
->index
; i
++) {
137 field_offset
+= type_size(glsl_get_struct_field(parent_type
, i
));
139 offset
= nir_iadd(b
, offset
, nir_imm_int(b
, field_offset
));
146 static nir_intrinsic_op
147 load_op(struct lower_io_state
*state
,
148 nir_variable_mode mode
, bool per_vertex
)
152 case nir_var_shader_in
:
153 op
= per_vertex
? nir_intrinsic_load_per_vertex_input
:
154 nir_intrinsic_load_input
;
156 case nir_var_shader_out
:
157 op
= per_vertex
? nir_intrinsic_load_per_vertex_output
:
158 nir_intrinsic_load_output
;
160 case nir_var_uniform
:
161 op
= nir_intrinsic_load_uniform
;
164 unreachable("Unknown variable mode");
170 nir_lower_io_block(nir_block
*block
, void *void_state
)
172 struct lower_io_state
*state
= void_state
;
174 nir_builder
*b
= &state
->builder
;
176 nir_foreach_instr_safe(block
, instr
) {
177 if (instr
->type
!= nir_instr_type_intrinsic
)
180 nir_intrinsic_instr
*intrin
= nir_instr_as_intrinsic(instr
);
182 if (intrin
->intrinsic
!= nir_intrinsic_load_var
&&
183 intrin
->intrinsic
!= nir_intrinsic_store_var
)
186 nir_variable_mode mode
= intrin
->variables
[0]->var
->data
.mode
;
188 if (state
->mode
!= nir_var_all
&& state
->mode
!= mode
)
191 if (mode
!= nir_var_shader_in
&&
192 mode
!= nir_var_shader_out
&&
193 mode
!= nir_var_uniform
)
196 b
->cursor
= nir_before_instr(instr
);
198 switch (intrin
->intrinsic
) {
199 case nir_intrinsic_load_var
: {
201 is_per_vertex_input(state
, intrin
->variables
[0]->var
) ||
202 is_per_vertex_output(state
, intrin
->variables
[0]->var
);
205 nir_ssa_def
*vertex_index
;
207 offset
= get_io_offset(b
, intrin
->variables
[0],
208 per_vertex
? &vertex_index
: NULL
,
211 nir_intrinsic_instr
*load
=
212 nir_intrinsic_instr_create(state
->mem_ctx
,
213 load_op(state
, mode
, per_vertex
));
214 load
->num_components
= intrin
->num_components
;
216 load
->const_index
[0] =
217 intrin
->variables
[0]->var
->data
.driver_location
;
220 load
->src
[0] = nir_src_for_ssa(vertex_index
);
222 load
->src
[per_vertex
? 1 : 0] = nir_src_for_ssa(offset
);
224 if (intrin
->dest
.is_ssa
) {
225 nir_ssa_dest_init(&load
->instr
, &load
->dest
,
226 intrin
->num_components
, NULL
);
227 nir_ssa_def_rewrite_uses(&intrin
->dest
.ssa
,
228 nir_src_for_ssa(&load
->dest
.ssa
));
230 nir_dest_copy(&load
->dest
, &intrin
->dest
, state
->mem_ctx
);
233 nir_instr_insert_before(&intrin
->instr
, &load
->instr
);
234 nir_instr_remove(&intrin
->instr
);
238 case nir_intrinsic_store_var
: {
239 assert(mode
== nir_var_shader_out
);
242 nir_ssa_def
*vertex_index
;
245 is_per_vertex_output(state
, intrin
->variables
[0]->var
);
247 offset
= get_io_offset(b
, intrin
->variables
[0],
248 per_vertex
? &vertex_index
: NULL
,
251 nir_intrinsic_op store_op
=
252 per_vertex
? nir_intrinsic_store_per_vertex_output
:
253 nir_intrinsic_store_output
;
255 nir_intrinsic_instr
*store
= nir_intrinsic_instr_create(state
->mem_ctx
,
257 store
->num_components
= intrin
->num_components
;
259 nir_src_copy(&store
->src
[0], &intrin
->src
[0], store
);
261 store
->const_index
[0] =
262 intrin
->variables
[0]->var
->data
.driver_location
;
265 store
->src
[1] = nir_src_for_ssa(vertex_index
);
267 store
->src
[per_vertex
? 2 : 1] = nir_src_for_ssa(offset
);
269 nir_instr_insert_before(&intrin
->instr
, &store
->instr
);
270 nir_instr_remove(&intrin
->instr
);
283 nir_lower_io_impl(nir_function_impl
*impl
,
284 nir_variable_mode mode
,
285 int (*type_size
)(const struct glsl_type
*))
287 struct lower_io_state state
;
289 nir_builder_init(&state
.builder
, impl
);
290 state
.mem_ctx
= ralloc_parent(impl
);
292 state
.type_size
= type_size
;
294 nir_foreach_block(impl
, nir_lower_io_block
, &state
);
296 nir_metadata_preserve(impl
, nir_metadata_block_index
|
297 nir_metadata_dominance
);
301 nir_lower_io(nir_shader
*shader
, nir_variable_mode mode
,
302 int (*type_size
)(const struct glsl_type
*))
304 nir_foreach_overload(shader
, overload
) {
306 nir_lower_io_impl(overload
->impl
, mode
, type_size
);
311 * Return the offset soruce for a load/store intrinsic.
314 nir_get_io_offset_src(nir_intrinsic_instr
*instr
)
316 switch (instr
->intrinsic
) {
317 case nir_intrinsic_load_input
:
318 case nir_intrinsic_load_output
:
319 case nir_intrinsic_load_uniform
:
320 return &instr
->src
[0];
321 case nir_intrinsic_load_ubo
:
322 case nir_intrinsic_load_ssbo
:
323 case nir_intrinsic_load_per_vertex_input
:
324 case nir_intrinsic_load_per_vertex_output
:
325 case nir_intrinsic_store_output
:
326 return &instr
->src
[1];
327 case nir_intrinsic_store_ssbo
:
328 case nir_intrinsic_store_per_vertex_output
:
329 return &instr
->src
[2];
336 * Return the vertex index source for a load/store per_vertex intrinsic.
339 nir_get_io_vertex_index_src(nir_intrinsic_instr
*instr
)
341 switch (instr
->intrinsic
) {
342 case nir_intrinsic_load_per_vertex_input
:
343 case nir_intrinsic_load_per_vertex_output
:
344 return &instr
->src
[0];
345 case nir_intrinsic_store_per_vertex_output
:
346 return &instr
->src
[1];