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"
36 #include "nir_deref.h"
38 struct lower_io_state
{
41 int (*type_size
)(const struct glsl_type
*type
);
42 nir_variable_mode modes
;
43 nir_lower_io_options options
;
47 nir_assign_var_locations(struct exec_list
*var_list
, unsigned *size
,
48 int (*type_size
)(const struct glsl_type
*))
50 unsigned location
= 0;
52 nir_foreach_variable(var
, var_list
) {
54 * UBOs have their own address spaces, so don't count them towards the
55 * number of global uniforms
57 if ((var
->data
.mode
== nir_var_uniform
|| var
->data
.mode
== nir_var_shader_storage
) &&
58 var
->interface_type
!= NULL
)
61 var
->data
.driver_location
= location
;
62 location
+= type_size(var
->type
);
69 * Return true if the given variable is a per-vertex input/output array.
70 * (such as geometry shader inputs).
73 nir_is_per_vertex_io(const nir_variable
*var
, gl_shader_stage stage
)
75 if (var
->data
.patch
|| !glsl_type_is_array(var
->type
))
78 if (var
->data
.mode
== nir_var_shader_in
)
79 return stage
== MESA_SHADER_GEOMETRY
||
80 stage
== MESA_SHADER_TESS_CTRL
||
81 stage
== MESA_SHADER_TESS_EVAL
;
83 if (var
->data
.mode
== nir_var_shader_out
)
84 return stage
== MESA_SHADER_TESS_CTRL
;
90 get_io_offset(nir_builder
*b
, nir_deref_instr
*deref
,
91 nir_ssa_def
**vertex_index
,
92 int (*type_size
)(const struct glsl_type
*),
96 nir_deref_path_init(&path
, deref
, NULL
);
98 assert(path
.path
[0]->deref_type
== nir_deref_type_var
);
99 nir_deref_instr
**p
= &path
.path
[1];
101 /* For per-vertex input arrays (i.e. geometry shader inputs), keep the
102 * outermost array index separate. Process the rest normally.
104 if (vertex_index
!= NULL
) {
105 assert((*p
)->deref_type
== nir_deref_type_array
);
106 *vertex_index
= nir_ssa_for_src(b
, (*p
)->arr
.index
, 1);
110 if (path
.path
[0]->var
->data
.compact
) {
111 assert((*p
)->deref_type
== nir_deref_type_array
);
112 assert(glsl_type_is_scalar((*p
)->type
));
114 /* We always lower indirect dereferences for "compact" array vars. */
115 const unsigned index
= nir_src_as_uint((*p
)->arr
.index
);
116 const unsigned total_offset
= *component
+ index
;
117 const unsigned slot_offset
= total_offset
/ 4;
118 *component
= total_offset
% 4;
119 return nir_imm_int(b
, type_size(glsl_vec4_type()) * slot_offset
);
122 /* Just emit code and let constant-folding go to town */
123 nir_ssa_def
*offset
= nir_imm_int(b
, 0);
126 if ((*p
)->deref_type
== nir_deref_type_array
) {
127 unsigned size
= type_size((*p
)->type
);
130 nir_imul(b
, nir_imm_int(b
, size
),
131 nir_ssa_for_src(b
, (*p
)->arr
.index
, 1));
133 offset
= nir_iadd(b
, offset
, mul
);
134 } else if ((*p
)->deref_type
== nir_deref_type_struct
) {
135 /* p starts at path[1], so this is safe */
136 nir_deref_instr
*parent
= *(p
- 1);
138 unsigned field_offset
= 0;
139 for (unsigned i
= 0; i
< (*p
)->strct
.index
; i
++) {
140 field_offset
+= type_size(glsl_get_struct_field(parent
->type
, i
));
142 offset
= nir_iadd(b
, offset
, nir_imm_int(b
, field_offset
));
144 unreachable("Unsupported deref type");
148 nir_deref_path_finish(&path
);
153 static nir_intrinsic_instr
*
154 lower_load(nir_intrinsic_instr
*intrin
, struct lower_io_state
*state
,
155 nir_ssa_def
*vertex_index
, nir_variable
*var
, nir_ssa_def
*offset
,
158 const nir_shader
*nir
= state
->builder
.shader
;
159 nir_variable_mode mode
= var
->data
.mode
;
160 nir_ssa_def
*barycentric
= NULL
;
164 case nir_var_shader_in
:
165 if (nir
->info
.stage
== MESA_SHADER_FRAGMENT
&&
166 nir
->options
->use_interpolated_input_intrinsics
&&
167 var
->data
.interpolation
!= INTERP_MODE_FLAT
) {
168 assert(vertex_index
== NULL
);
170 nir_intrinsic_op bary_op
;
171 if (var
->data
.sample
||
172 (state
->options
& nir_lower_io_force_sample_interpolation
))
173 bary_op
= nir_intrinsic_load_barycentric_sample
;
174 else if (var
->data
.centroid
)
175 bary_op
= nir_intrinsic_load_barycentric_centroid
;
177 bary_op
= nir_intrinsic_load_barycentric_pixel
;
179 barycentric
= nir_load_barycentric(&state
->builder
, bary_op
,
180 var
->data
.interpolation
);
181 op
= nir_intrinsic_load_interpolated_input
;
183 op
= vertex_index
? nir_intrinsic_load_per_vertex_input
:
184 nir_intrinsic_load_input
;
187 case nir_var_shader_out
:
188 op
= vertex_index
? nir_intrinsic_load_per_vertex_output
:
189 nir_intrinsic_load_output
;
191 case nir_var_uniform
:
192 op
= nir_intrinsic_load_uniform
;
195 op
= nir_intrinsic_load_shared
;
198 unreachable("Unknown variable mode");
201 nir_intrinsic_instr
*load
=
202 nir_intrinsic_instr_create(state
->builder
.shader
, op
);
203 load
->num_components
= intrin
->num_components
;
205 nir_intrinsic_set_base(load
, var
->data
.driver_location
);
206 if (mode
== nir_var_shader_in
|| mode
== nir_var_shader_out
)
207 nir_intrinsic_set_component(load
, component
);
209 if (load
->intrinsic
== nir_intrinsic_load_uniform
)
210 nir_intrinsic_set_range(load
, state
->type_size(var
->type
));
213 load
->src
[0] = nir_src_for_ssa(vertex_index
);
214 load
->src
[1] = nir_src_for_ssa(offset
);
215 } else if (barycentric
) {
216 load
->src
[0] = nir_src_for_ssa(barycentric
);
217 load
->src
[1] = nir_src_for_ssa(offset
);
219 load
->src
[0] = nir_src_for_ssa(offset
);
225 static nir_intrinsic_instr
*
226 lower_store(nir_intrinsic_instr
*intrin
, struct lower_io_state
*state
,
227 nir_ssa_def
*vertex_index
, nir_variable
*var
, nir_ssa_def
*offset
,
230 nir_variable_mode mode
= var
->data
.mode
;
233 if (mode
== nir_var_shared
) {
234 op
= nir_intrinsic_store_shared
;
236 assert(mode
== nir_var_shader_out
);
237 op
= vertex_index
? nir_intrinsic_store_per_vertex_output
:
238 nir_intrinsic_store_output
;
241 nir_intrinsic_instr
*store
=
242 nir_intrinsic_instr_create(state
->builder
.shader
, op
);
243 store
->num_components
= intrin
->num_components
;
245 nir_src_copy(&store
->src
[0], &intrin
->src
[1], store
);
247 nir_intrinsic_set_base(store
, var
->data
.driver_location
);
249 if (mode
== nir_var_shader_out
)
250 nir_intrinsic_set_component(store
, component
);
252 nir_intrinsic_set_write_mask(store
, nir_intrinsic_write_mask(intrin
));
255 store
->src
[1] = nir_src_for_ssa(vertex_index
);
257 store
->src
[vertex_index
? 2 : 1] = nir_src_for_ssa(offset
);
262 static nir_intrinsic_instr
*
263 lower_atomic(nir_intrinsic_instr
*intrin
, struct lower_io_state
*state
,
264 nir_variable
*var
, nir_ssa_def
*offset
)
266 assert(var
->data
.mode
== nir_var_shared
);
269 switch (intrin
->intrinsic
) {
270 #define OP(O) case nir_intrinsic_deref_##O: op = nir_intrinsic_shared_##O; break;
284 OP(atomic_fcomp_swap
)
287 unreachable("Invalid atomic");
290 nir_intrinsic_instr
*atomic
=
291 nir_intrinsic_instr_create(state
->builder
.shader
, op
);
293 nir_intrinsic_set_base(atomic
, var
->data
.driver_location
);
295 atomic
->src
[0] = nir_src_for_ssa(offset
);
296 assert(nir_intrinsic_infos
[intrin
->intrinsic
].num_srcs
==
297 nir_intrinsic_infos
[op
].num_srcs
);
298 for (unsigned i
= 1; i
< nir_intrinsic_infos
[op
].num_srcs
; i
++) {
299 nir_src_copy(&atomic
->src
[i
], &intrin
->src
[i
], atomic
);
305 static nir_intrinsic_instr
*
306 lower_interpolate_at(nir_intrinsic_instr
*intrin
, struct lower_io_state
*state
,
307 nir_variable
*var
, nir_ssa_def
*offset
, unsigned component
)
309 assert(var
->data
.mode
== nir_var_shader_in
);
311 /* Ignore interpolateAt() for flat variables - flat is flat. */
312 if (var
->data
.interpolation
== INTERP_MODE_FLAT
)
313 return lower_load(intrin
, state
, NULL
, var
, offset
, component
);
315 nir_intrinsic_op bary_op
;
316 switch (intrin
->intrinsic
) {
317 case nir_intrinsic_interp_deref_at_centroid
:
318 bary_op
= (state
->options
& nir_lower_io_force_sample_interpolation
) ?
319 nir_intrinsic_load_barycentric_sample
:
320 nir_intrinsic_load_barycentric_centroid
;
322 case nir_intrinsic_interp_deref_at_sample
:
323 bary_op
= nir_intrinsic_load_barycentric_at_sample
;
325 case nir_intrinsic_interp_deref_at_offset
:
326 bary_op
= nir_intrinsic_load_barycentric_at_offset
;
329 unreachable("Bogus interpolateAt() intrinsic.");
332 nir_intrinsic_instr
*bary_setup
=
333 nir_intrinsic_instr_create(state
->builder
.shader
, bary_op
);
335 nir_ssa_dest_init(&bary_setup
->instr
, &bary_setup
->dest
, 2, 32, NULL
);
336 nir_intrinsic_set_interp_mode(bary_setup
, var
->data
.interpolation
);
338 if (intrin
->intrinsic
== nir_intrinsic_interp_deref_at_sample
||
339 intrin
->intrinsic
== nir_intrinsic_interp_deref_at_offset
)
340 nir_src_copy(&bary_setup
->src
[0], &intrin
->src
[1], bary_setup
);
342 nir_builder_instr_insert(&state
->builder
, &bary_setup
->instr
);
344 nir_intrinsic_instr
*load
=
345 nir_intrinsic_instr_create(state
->builder
.shader
,
346 nir_intrinsic_load_interpolated_input
);
347 load
->num_components
= intrin
->num_components
;
349 nir_intrinsic_set_base(load
, var
->data
.driver_location
);
350 nir_intrinsic_set_component(load
, component
);
352 load
->src
[0] = nir_src_for_ssa(&bary_setup
->dest
.ssa
);
353 load
->src
[1] = nir_src_for_ssa(offset
);
359 nir_lower_io_block(nir_block
*block
,
360 struct lower_io_state
*state
)
362 nir_builder
*b
= &state
->builder
;
363 const nir_shader_compiler_options
*options
= b
->shader
->options
;
364 bool progress
= false;
366 nir_foreach_instr_safe(instr
, block
) {
367 if (instr
->type
!= nir_instr_type_intrinsic
)
370 nir_intrinsic_instr
*intrin
= nir_instr_as_intrinsic(instr
);
372 switch (intrin
->intrinsic
) {
373 case nir_intrinsic_load_deref
:
374 case nir_intrinsic_store_deref
:
375 case nir_intrinsic_deref_atomic_add
:
376 case nir_intrinsic_deref_atomic_imin
:
377 case nir_intrinsic_deref_atomic_umin
:
378 case nir_intrinsic_deref_atomic_imax
:
379 case nir_intrinsic_deref_atomic_umax
:
380 case nir_intrinsic_deref_atomic_and
:
381 case nir_intrinsic_deref_atomic_or
:
382 case nir_intrinsic_deref_atomic_xor
:
383 case nir_intrinsic_deref_atomic_exchange
:
384 case nir_intrinsic_deref_atomic_comp_swap
:
385 case nir_intrinsic_deref_atomic_fadd
:
386 case nir_intrinsic_deref_atomic_fmin
:
387 case nir_intrinsic_deref_atomic_fmax
:
388 case nir_intrinsic_deref_atomic_fcomp_swap
:
389 /* We can lower the io for this nir instrinsic */
391 case nir_intrinsic_interp_deref_at_centroid
:
392 case nir_intrinsic_interp_deref_at_sample
:
393 case nir_intrinsic_interp_deref_at_offset
:
394 /* We can optionally lower these to load_interpolated_input */
395 if (options
->use_interpolated_input_intrinsics
)
398 /* We can't lower the io for this nir instrinsic, so skip it */
402 nir_deref_instr
*deref
= nir_src_as_deref(intrin
->src
[0]);
404 nir_variable
*var
= nir_deref_instr_get_variable(deref
);
405 nir_variable_mode mode
= var
->data
.mode
;
407 if ((state
->modes
& mode
) == 0)
410 if (mode
!= nir_var_shader_in
&&
411 mode
!= nir_var_shader_out
&&
412 mode
!= nir_var_shared
&&
413 mode
!= nir_var_uniform
)
416 b
->cursor
= nir_before_instr(instr
);
418 const bool per_vertex
= nir_is_per_vertex_io(var
, b
->shader
->info
.stage
);
421 nir_ssa_def
*vertex_index
= NULL
;
422 unsigned component_offset
= var
->data
.location_frac
;
424 offset
= get_io_offset(b
, deref
, per_vertex
? &vertex_index
: NULL
,
425 state
->type_size
, &component_offset
);
427 nir_intrinsic_instr
*replacement
;
429 switch (intrin
->intrinsic
) {
430 case nir_intrinsic_load_deref
:
431 replacement
= lower_load(intrin
, state
, vertex_index
, var
, offset
,
435 case nir_intrinsic_store_deref
:
436 replacement
= lower_store(intrin
, state
, vertex_index
, var
, offset
,
440 case nir_intrinsic_deref_atomic_add
:
441 case nir_intrinsic_deref_atomic_imin
:
442 case nir_intrinsic_deref_atomic_umin
:
443 case nir_intrinsic_deref_atomic_imax
:
444 case nir_intrinsic_deref_atomic_umax
:
445 case nir_intrinsic_deref_atomic_and
:
446 case nir_intrinsic_deref_atomic_or
:
447 case nir_intrinsic_deref_atomic_xor
:
448 case nir_intrinsic_deref_atomic_exchange
:
449 case nir_intrinsic_deref_atomic_comp_swap
:
450 case nir_intrinsic_deref_atomic_fadd
:
451 case nir_intrinsic_deref_atomic_fmin
:
452 case nir_intrinsic_deref_atomic_fmax
:
453 case nir_intrinsic_deref_atomic_fcomp_swap
:
454 assert(vertex_index
== NULL
);
455 replacement
= lower_atomic(intrin
, state
, var
, offset
);
458 case nir_intrinsic_interp_deref_at_centroid
:
459 case nir_intrinsic_interp_deref_at_sample
:
460 case nir_intrinsic_interp_deref_at_offset
:
461 assert(vertex_index
== NULL
);
462 replacement
= lower_interpolate_at(intrin
, state
, var
, offset
,
470 if (nir_intrinsic_infos
[intrin
->intrinsic
].has_dest
) {
471 if (intrin
->dest
.is_ssa
) {
472 nir_ssa_dest_init(&replacement
->instr
, &replacement
->dest
,
473 intrin
->dest
.ssa
.num_components
,
474 intrin
->dest
.ssa
.bit_size
, NULL
);
475 nir_ssa_def_rewrite_uses(&intrin
->dest
.ssa
,
476 nir_src_for_ssa(&replacement
->dest
.ssa
));
478 nir_dest_copy(&replacement
->dest
, &intrin
->dest
, &intrin
->instr
);
482 nir_instr_insert_before(&intrin
->instr
, &replacement
->instr
);
483 nir_instr_remove(&intrin
->instr
);
491 nir_lower_io_impl(nir_function_impl
*impl
,
492 nir_variable_mode modes
,
493 int (*type_size
)(const struct glsl_type
*),
494 nir_lower_io_options options
)
496 struct lower_io_state state
;
497 bool progress
= false;
499 nir_builder_init(&state
.builder
, impl
);
500 state
.dead_ctx
= ralloc_context(NULL
);
502 state
.type_size
= type_size
;
503 state
.options
= options
;
505 nir_foreach_block(block
, impl
) {
506 progress
|= nir_lower_io_block(block
, &state
);
509 ralloc_free(state
.dead_ctx
);
511 nir_metadata_preserve(impl
, nir_metadata_block_index
|
512 nir_metadata_dominance
);
517 nir_lower_io(nir_shader
*shader
, nir_variable_mode modes
,
518 int (*type_size
)(const struct glsl_type
*),
519 nir_lower_io_options options
)
521 bool progress
= false;
523 nir_foreach_function(function
, shader
) {
524 if (function
->impl
) {
525 progress
|= nir_lower_io_impl(function
->impl
, modes
,
534 * Return the offset source for a load/store intrinsic.
537 nir_get_io_offset_src(nir_intrinsic_instr
*instr
)
539 switch (instr
->intrinsic
) {
540 case nir_intrinsic_load_input
:
541 case nir_intrinsic_load_output
:
542 case nir_intrinsic_load_uniform
:
543 return &instr
->src
[0];
544 case nir_intrinsic_load_ubo
:
545 case nir_intrinsic_load_ssbo
:
546 case nir_intrinsic_load_per_vertex_input
:
547 case nir_intrinsic_load_per_vertex_output
:
548 case nir_intrinsic_load_interpolated_input
:
549 case nir_intrinsic_store_output
:
550 return &instr
->src
[1];
551 case nir_intrinsic_store_ssbo
:
552 case nir_intrinsic_store_per_vertex_output
:
553 return &instr
->src
[2];
560 * Return the vertex index source for a load/store per_vertex intrinsic.
563 nir_get_io_vertex_index_src(nir_intrinsic_instr
*instr
)
565 switch (instr
->intrinsic
) {
566 case nir_intrinsic_load_per_vertex_input
:
567 case nir_intrinsic_load_per_vertex_output
:
568 return &instr
->src
[0];
569 case nir_intrinsic_store_per_vertex_output
:
570 return &instr
->src
[1];