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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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21 * DEALINGS IN THE SOFTWARE.
25 * \file link_varyings.cpp
27 * Linker functions related specifically to linking varyings between shader
32 #include "main/mtypes.h"
33 #include "glsl_symbol_table.h"
34 #include "glsl_parser_extras.h"
35 #include "ir_optimization.h"
37 #include "link_varyings.h"
38 #include "main/macros.h"
39 #include "util/hash_table.h"
44 * Get the varying type stripped of the outermost array if we're processing
45 * a stage whose varyings are arrays indexed by a vertex number (such as
46 * geometry shader inputs).
48 static const glsl_type
*
49 get_varying_type(const ir_variable
*var
, gl_shader_stage stage
)
51 const glsl_type
*type
= var
->type
;
53 if (!var
->data
.patch
&&
54 ((var
->data
.mode
== ir_var_shader_out
&&
55 stage
== MESA_SHADER_TESS_CTRL
) ||
56 (var
->data
.mode
== ir_var_shader_in
&&
57 (stage
== MESA_SHADER_TESS_CTRL
|| stage
== MESA_SHADER_TESS_EVAL
||
58 stage
== MESA_SHADER_GEOMETRY
)))) {
59 assert(type
->is_array());
60 type
= type
->fields
.array
;
67 create_xfb_varying_names(void *mem_ctx
, const glsl_type
*t
, char **name
,
68 size_t name_length
, unsigned *count
,
69 const char *ifc_member_name
,
70 const glsl_type
*ifc_member_t
, char ***varying_names
)
72 if (t
->is_interface()) {
73 size_t new_length
= name_length
;
75 assert(ifc_member_name
&& ifc_member_t
);
76 ralloc_asprintf_rewrite_tail(name
, &new_length
, ".%s", ifc_member_name
);
78 create_xfb_varying_names(mem_ctx
, ifc_member_t
, name
, new_length
, count
,
79 NULL
, NULL
, varying_names
);
80 } else if (t
->is_record()) {
81 for (unsigned i
= 0; i
< t
->length
; i
++) {
82 const char *field
= t
->fields
.structure
[i
].name
;
83 size_t new_length
= name_length
;
85 ralloc_asprintf_rewrite_tail(name
, &new_length
, ".%s", field
);
87 create_xfb_varying_names(mem_ctx
, t
->fields
.structure
[i
].type
, name
,
88 new_length
, count
, NULL
, NULL
,
91 } else if (t
->without_array()->is_record() ||
92 t
->without_array()->is_interface() ||
93 (t
->is_array() && t
->fields
.array
->is_array())) {
94 for (unsigned i
= 0; i
< t
->length
; i
++) {
95 size_t new_length
= name_length
;
97 /* Append the subscript to the current variable name */
98 ralloc_asprintf_rewrite_tail(name
, &new_length
, "[%u]", i
);
100 create_xfb_varying_names(mem_ctx
, t
->fields
.array
, name
, new_length
,
101 count
, ifc_member_name
, ifc_member_t
,
105 (*varying_names
)[(*count
)++] = ralloc_strdup(mem_ctx
, *name
);
110 process_xfb_layout_qualifiers(void *mem_ctx
, const gl_linked_shader
*sh
,
111 struct gl_shader_program
*prog
,
112 unsigned *num_tfeedback_decls
,
113 char ***varying_names
)
115 bool has_xfb_qualifiers
= false;
117 /* We still need to enable transform feedback mode even if xfb_stride is
118 * only applied to a global out. Also we don't bother to propagate
119 * xfb_stride to interface block members so this will catch that case also.
121 for (unsigned j
= 0; j
< MAX_FEEDBACK_BUFFERS
; j
++) {
122 if (prog
->TransformFeedback
.BufferStride
[j
]) {
123 has_xfb_qualifiers
= true;
128 foreach_in_list(ir_instruction
, node
, sh
->ir
) {
129 ir_variable
*var
= node
->as_variable();
130 if (!var
|| var
->data
.mode
!= ir_var_shader_out
)
133 /* From the ARB_enhanced_layouts spec:
135 * "Any shader making any static use (after preprocessing) of any of
136 * these *xfb_* qualifiers will cause the shader to be in a
137 * transform feedback capturing mode and hence responsible for
138 * describing the transform feedback setup. This mode will capture
139 * any output selected by *xfb_offset*, directly or indirectly, to
140 * a transform feedback buffer."
142 if (var
->data
.explicit_xfb_buffer
|| var
->data
.explicit_xfb_stride
) {
143 has_xfb_qualifiers
= true;
146 if (var
->data
.explicit_xfb_offset
) {
147 *num_tfeedback_decls
+= var
->type
->varying_count();
148 has_xfb_qualifiers
= true;
152 if (*num_tfeedback_decls
== 0)
153 return has_xfb_qualifiers
;
156 *varying_names
= ralloc_array(mem_ctx
, char *, *num_tfeedback_decls
);
157 foreach_in_list(ir_instruction
, node
, sh
->ir
) {
158 ir_variable
*var
= node
->as_variable();
159 if (!var
|| var
->data
.mode
!= ir_var_shader_out
)
162 if (var
->data
.explicit_xfb_offset
) {
164 const glsl_type
*type
, *member_type
;
166 if (var
->data
.from_named_ifc_block
) {
167 type
= var
->get_interface_type();
169 /* Find the member type before it was altered by lowering */
170 const glsl_type
*type_wa
= type
->without_array();
172 type_wa
->fields
.structure
[type_wa
->field_index(var
->name
)].type
;
173 name
= ralloc_strdup(NULL
, type_wa
->name
);
177 name
= ralloc_strdup(NULL
, var
->name
);
179 create_xfb_varying_names(mem_ctx
, type
, &name
, strlen(name
), &i
,
180 var
->name
, member_type
, varying_names
);
185 assert(i
== *num_tfeedback_decls
);
186 return has_xfb_qualifiers
;
190 * Validate the types and qualifiers of an output from one stage against the
191 * matching input to another stage.
194 cross_validate_types_and_qualifiers(struct gl_context
*ctx
,
195 struct gl_shader_program
*prog
,
196 const ir_variable
*input
,
197 const ir_variable
*output
,
198 gl_shader_stage consumer_stage
,
199 gl_shader_stage producer_stage
)
201 /* Check that the types match between stages.
203 const glsl_type
*type_to_match
= input
->type
;
205 /* VS -> GS, VS -> TCS, VS -> TES, TES -> GS */
206 const bool extra_array_level
= (producer_stage
== MESA_SHADER_VERTEX
&&
207 consumer_stage
!= MESA_SHADER_FRAGMENT
) ||
208 consumer_stage
== MESA_SHADER_GEOMETRY
;
209 if (extra_array_level
) {
210 assert(type_to_match
->is_array());
211 type_to_match
= type_to_match
->fields
.array
;
214 if (type_to_match
!= output
->type
) {
215 /* There is a bit of a special case for gl_TexCoord. This
216 * built-in is unsized by default. Applications that variable
217 * access it must redeclare it with a size. There is some
218 * language in the GLSL spec that implies the fragment shader
219 * and vertex shader do not have to agree on this size. Other
220 * driver behave this way, and one or two applications seem to
223 * Neither declaration needs to be modified here because the array
224 * sizes are fixed later when update_array_sizes is called.
226 * From page 48 (page 54 of the PDF) of the GLSL 1.10 spec:
228 * "Unlike user-defined varying variables, the built-in
229 * varying variables don't have a strict one-to-one
230 * correspondence between the vertex language and the
231 * fragment language."
233 if (!output
->type
->is_array() || !is_gl_identifier(output
->name
)) {
235 "%s shader output `%s' declared as type `%s', "
236 "but %s shader input declared as type `%s'\n",
237 _mesa_shader_stage_to_string(producer_stage
),
240 _mesa_shader_stage_to_string(consumer_stage
),
246 /* Check that all of the qualifiers match between stages.
249 /* According to the OpenGL and OpenGLES GLSL specs, the centroid qualifier
250 * should match until OpenGL 4.3 and OpenGLES 3.1. The OpenGLES 3.0
251 * conformance test suite does not verify that the qualifiers must match.
252 * The deqp test suite expects the opposite (OpenGLES 3.1) behavior for
253 * OpenGLES 3.0 drivers, so we relax the checking in all cases.
255 if (false /* always skip the centroid check */ &&
256 prog
->data
->Version
< (prog
->IsES
? 310 : 430) &&
257 input
->data
.centroid
!= output
->data
.centroid
) {
259 "%s shader output `%s' %s centroid qualifier, "
260 "but %s shader input %s centroid qualifier\n",
261 _mesa_shader_stage_to_string(producer_stage
),
263 (output
->data
.centroid
) ? "has" : "lacks",
264 _mesa_shader_stage_to_string(consumer_stage
),
265 (input
->data
.centroid
) ? "has" : "lacks");
269 if (input
->data
.sample
!= output
->data
.sample
) {
271 "%s shader output `%s' %s sample qualifier, "
272 "but %s shader input %s sample qualifier\n",
273 _mesa_shader_stage_to_string(producer_stage
),
275 (output
->data
.sample
) ? "has" : "lacks",
276 _mesa_shader_stage_to_string(consumer_stage
),
277 (input
->data
.sample
) ? "has" : "lacks");
281 if (input
->data
.patch
!= output
->data
.patch
) {
283 "%s shader output `%s' %s patch qualifier, "
284 "but %s shader input %s patch qualifier\n",
285 _mesa_shader_stage_to_string(producer_stage
),
287 (output
->data
.patch
) ? "has" : "lacks",
288 _mesa_shader_stage_to_string(consumer_stage
),
289 (input
->data
.patch
) ? "has" : "lacks");
293 /* The GLSL 4.30 and GLSL ES 3.00 specifications say:
295 * "As only outputs need be declared with invariant, an output from
296 * one shader stage will still match an input of a subsequent stage
297 * without the input being declared as invariant."
299 * while GLSL 4.20 says:
301 * "For variables leaving one shader and coming into another shader,
302 * the invariant keyword has to be used in both shaders, or a link
303 * error will result."
305 * and GLSL ES 1.00 section 4.6.4 "Invariance and Linking" says:
307 * "The invariance of varyings that are declared in both the vertex
308 * and fragment shaders must match."
310 if (input
->data
.invariant
!= output
->data
.invariant
&&
311 prog
->data
->Version
< (prog
->IsES
? 300 : 430)) {
313 "%s shader output `%s' %s invariant qualifier, "
314 "but %s shader input %s invariant qualifier\n",
315 _mesa_shader_stage_to_string(producer_stage
),
317 (output
->data
.invariant
) ? "has" : "lacks",
318 _mesa_shader_stage_to_string(consumer_stage
),
319 (input
->data
.invariant
) ? "has" : "lacks");
323 /* GLSL >= 4.40 removes text requiring interpolation qualifiers
324 * to match cross stage, they must only match within the same stage.
326 * From page 84 (page 90 of the PDF) of the GLSL 4.40 spec:
328 * "It is a link-time error if, within the same stage, the interpolation
329 * qualifiers of variables of the same name do not match.
331 * Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
333 * "When no interpolation qualifier is present, smooth interpolation
336 * So we match variables where one is smooth and the other has no explicit
339 unsigned input_interpolation
= input
->data
.interpolation
;
340 unsigned output_interpolation
= output
->data
.interpolation
;
342 if (input_interpolation
== INTERP_MODE_NONE
)
343 input_interpolation
= INTERP_MODE_SMOOTH
;
344 if (output_interpolation
== INTERP_MODE_NONE
)
345 output_interpolation
= INTERP_MODE_SMOOTH
;
347 if (input_interpolation
!= output_interpolation
&&
348 prog
->data
->Version
< 440) {
349 if (!ctx
->Const
.AllowGLSLCrossStageInterpolationMismatch
) {
351 "%s shader output `%s' specifies %s "
352 "interpolation qualifier, "
353 "but %s shader input specifies %s "
354 "interpolation qualifier\n",
355 _mesa_shader_stage_to_string(producer_stage
),
357 interpolation_string(output
->data
.interpolation
),
358 _mesa_shader_stage_to_string(consumer_stage
),
359 interpolation_string(input
->data
.interpolation
));
363 "%s shader output `%s' specifies %s "
364 "interpolation qualifier, "
365 "but %s shader input specifies %s "
366 "interpolation qualifier\n",
367 _mesa_shader_stage_to_string(producer_stage
),
369 interpolation_string(output
->data
.interpolation
),
370 _mesa_shader_stage_to_string(consumer_stage
),
371 interpolation_string(input
->data
.interpolation
));
377 * Validate front and back color outputs against single color input
380 cross_validate_front_and_back_color(struct gl_context
*ctx
,
381 struct gl_shader_program
*prog
,
382 const ir_variable
*input
,
383 const ir_variable
*front_color
,
384 const ir_variable
*back_color
,
385 gl_shader_stage consumer_stage
,
386 gl_shader_stage producer_stage
)
388 if (front_color
!= NULL
&& front_color
->data
.assigned
)
389 cross_validate_types_and_qualifiers(ctx
, prog
, input
, front_color
,
390 consumer_stage
, producer_stage
);
392 if (back_color
!= NULL
&& back_color
->data
.assigned
)
393 cross_validate_types_and_qualifiers(ctx
, prog
, input
, back_color
,
394 consumer_stage
, producer_stage
);
398 compute_variable_location_slot(ir_variable
*var
, gl_shader_stage stage
)
400 unsigned location_start
= VARYING_SLOT_VAR0
;
403 case MESA_SHADER_VERTEX
:
404 if (var
->data
.mode
== ir_var_shader_in
)
405 location_start
= VERT_ATTRIB_GENERIC0
;
407 case MESA_SHADER_TESS_CTRL
:
408 case MESA_SHADER_TESS_EVAL
:
410 location_start
= VARYING_SLOT_PATCH0
;
412 case MESA_SHADER_FRAGMENT
:
413 if (var
->data
.mode
== ir_var_shader_out
)
414 location_start
= FRAG_RESULT_DATA0
;
420 return var
->data
.location
- location_start
;
423 struct explicit_location_info
{
425 unsigned numerical_type
;
426 unsigned interpolation
;
432 static inline unsigned
433 get_numerical_type(const glsl_type
*type
)
435 /* From the OpenGL 4.6 spec, section 4.4.1 Input Layout Qualifiers, Page 68,
436 * (Location aliasing):
438 * "Further, when location aliasing, the aliases sharing the location
439 * must have the same underlying numerical type (floating-point or
442 if (type
->is_float() || type
->is_double())
443 return GLSL_TYPE_FLOAT
;
444 return GLSL_TYPE_INT
;
448 check_location_aliasing(struct explicit_location_info explicit_locations
[][4],
452 unsigned location_limit
,
453 const glsl_type
*type
,
454 unsigned interpolation
,
458 gl_shader_program
*prog
,
459 gl_shader_stage stage
)
462 if (type
->without_array()->is_record()) {
463 /* The component qualifier can't be used on structs so just treat
464 * all component slots as used.
468 unsigned dmul
= type
->without_array()->is_64bit() ? 2 : 1;
469 last_comp
= component
+ type
->without_array()->vector_elements
* dmul
;
472 while (location
< location_limit
) {
475 struct explicit_location_info
*info
=
476 &explicit_locations
[location
][comp
];
479 /* Component aliasing is not alloed */
480 if (comp
>= component
&& comp
< last_comp
) {
482 "%s shader has multiple outputs explicitly "
483 "assigned to location %d and component %d\n",
484 _mesa_shader_stage_to_string(stage
),
488 /* For all other used components we need to have matching
489 * types, interpolation and auxiliary storage
491 if (info
->numerical_type
!=
492 get_numerical_type(type
->without_array())) {
494 "Varyings sharing the same location must "
495 "have the same underlying numerical type. "
496 "Location %u component %u\n",
501 if (info
->interpolation
!= interpolation
) {
503 "%s shader has multiple outputs at explicit "
504 "location %u with different interpolation "
506 _mesa_shader_stage_to_string(stage
), location
);
510 if (info
->centroid
!= centroid
||
511 info
->sample
!= sample
||
512 info
->patch
!= patch
) {
514 "%s shader has multiple outputs at explicit "
515 "location %u with different aux storage\n",
516 _mesa_shader_stage_to_string(stage
), location
);
520 } else if (comp
>= component
&& comp
< last_comp
) {
522 info
->numerical_type
= get_numerical_type(type
->without_array());
523 info
->interpolation
= interpolation
;
524 info
->centroid
= centroid
;
525 info
->sample
= sample
;
531 /* We need to do some special handling for doubles as dvec3 and
532 * dvec4 consume two consecutive locations. We don't need to
533 * worry about components beginning at anything other than 0 as
534 * the spec does not allow this for dvec3 and dvec4.
536 if (comp
== 4 && last_comp
> 4) {
537 last_comp
= last_comp
- 4;
538 /* Bump location index and reset the component index */
552 validate_explicit_variable_location(struct gl_context
*ctx
,
553 struct explicit_location_info explicit_locations
[][4],
555 gl_shader_program
*prog
,
556 gl_linked_shader
*sh
)
558 const glsl_type
*type
= get_varying_type(var
, sh
->Stage
);
559 unsigned num_elements
= type
->count_attribute_slots(false);
560 unsigned idx
= compute_variable_location_slot(var
, sh
->Stage
);
561 unsigned slot_limit
= idx
+ num_elements
;
563 /* Vertex shader inputs and fragment shader outputs are validated in
564 * assign_attribute_or_color_locations() so we should not attempt to
565 * validate them again here.
568 if (var
->data
.mode
== ir_var_shader_out
) {
569 assert(sh
->Stage
!= MESA_SHADER_FRAGMENT
);
571 ctx
->Const
.Program
[sh
->Stage
].MaxOutputComponents
/ 4;
573 assert(var
->data
.mode
== ir_var_shader_in
);
574 assert(sh
->Stage
!= MESA_SHADER_VERTEX
);
576 ctx
->Const
.Program
[sh
->Stage
].MaxInputComponents
/ 4;
579 if (slot_limit
> slot_max
) {
581 "Invalid location %u in %s shader\n",
582 idx
, _mesa_shader_stage_to_string(sh
->Stage
));
586 const glsl_type
*type_without_array
= type
->without_array();
587 if (type_without_array
->is_interface()) {
588 for (unsigned i
= 0; i
< type_without_array
->length
; i
++) {
589 glsl_struct_field
*field
= &type_without_array
->fields
.structure
[i
];
590 unsigned field_location
= field
->location
-
591 (field
->patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
592 if (!check_location_aliasing(explicit_locations
, var
,
594 0, field_location
+ 1,
596 field
->interpolation
,
604 } else if (!check_location_aliasing(explicit_locations
, var
,
605 idx
, var
->data
.location_frac
,
607 var
->data
.interpolation
,
619 * Validate explicit locations for the inputs to the first stage and the
620 * outputs of the last stage in an SSO program (everything in between is
621 * validated in cross_validate_outputs_to_inputs).
624 validate_sso_explicit_locations(struct gl_context
*ctx
,
625 struct gl_shader_program
*prog
,
626 gl_shader_stage first_stage
,
627 gl_shader_stage last_stage
)
629 assert(prog
->SeparateShader
);
631 /* VS inputs and FS outputs are validated in
632 * assign_attribute_or_color_locations()
634 bool validate_first_stage
= first_stage
!= MESA_SHADER_VERTEX
;
635 bool validate_last_stage
= last_stage
!= MESA_SHADER_FRAGMENT
;
636 if (!validate_first_stage
&& !validate_last_stage
)
639 struct explicit_location_info explicit_locations
[MAX_VARYING
][4];
641 gl_shader_stage stages
[2] = { first_stage
, last_stage
};
642 bool validate_stage
[2] = { validate_first_stage
, validate_last_stage
};
643 ir_variable_mode var_direction
[2] = { ir_var_shader_in
, ir_var_shader_out
};
645 for (unsigned i
= 0; i
< 2; i
++) {
646 if (!validate_stage
[i
])
649 gl_shader_stage stage
= stages
[i
];
651 gl_linked_shader
*sh
= prog
->_LinkedShaders
[stage
];
654 memset(explicit_locations
, 0, sizeof(explicit_locations
));
656 foreach_in_list(ir_instruction
, node
, sh
->ir
) {
657 ir_variable
*const var
= node
->as_variable();
660 !var
->data
.explicit_location
||
661 var
->data
.location
< VARYING_SLOT_VAR0
||
662 var
->data
.mode
!= var_direction
[i
])
665 if (!validate_explicit_variable_location(
666 ctx
, explicit_locations
, var
, prog
, sh
)) {
674 * Validate that outputs from one stage match inputs of another
677 cross_validate_outputs_to_inputs(struct gl_context
*ctx
,
678 struct gl_shader_program
*prog
,
679 gl_linked_shader
*producer
,
680 gl_linked_shader
*consumer
)
682 glsl_symbol_table parameters
;
683 struct explicit_location_info explicit_locations
[MAX_VARYING
][4] = { 0 };
685 /* Find all shader outputs in the "producer" stage.
687 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
688 ir_variable
*const var
= node
->as_variable();
690 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
693 if (!var
->data
.explicit_location
694 || var
->data
.location
< VARYING_SLOT_VAR0
)
695 parameters
.add_variable(var
);
697 /* User-defined varyings with explicit locations are handled
698 * differently because they do not need to have matching names.
700 if (!validate_explicit_variable_location(ctx
,
702 var
, prog
, producer
)) {
709 /* Find all shader inputs in the "consumer" stage. Any variables that have
710 * matching outputs already in the symbol table must have the same type and
713 * Exception: if the consumer is the geometry shader, then the inputs
714 * should be arrays and the type of the array element should match the type
715 * of the corresponding producer output.
717 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
718 ir_variable
*const input
= node
->as_variable();
720 if (input
== NULL
|| input
->data
.mode
!= ir_var_shader_in
)
723 if (strcmp(input
->name
, "gl_Color") == 0 && input
->data
.used
) {
724 const ir_variable
*const front_color
=
725 parameters
.get_variable("gl_FrontColor");
727 const ir_variable
*const back_color
=
728 parameters
.get_variable("gl_BackColor");
730 cross_validate_front_and_back_color(ctx
, prog
, input
,
731 front_color
, back_color
,
732 consumer
->Stage
, producer
->Stage
);
733 } else if (strcmp(input
->name
, "gl_SecondaryColor") == 0 && input
->data
.used
) {
734 const ir_variable
*const front_color
=
735 parameters
.get_variable("gl_FrontSecondaryColor");
737 const ir_variable
*const back_color
=
738 parameters
.get_variable("gl_BackSecondaryColor");
740 cross_validate_front_and_back_color(ctx
, prog
, input
,
741 front_color
, back_color
,
742 consumer
->Stage
, producer
->Stage
);
744 /* The rules for connecting inputs and outputs change in the presence
745 * of explicit locations. In this case, we no longer care about the
746 * names of the variables. Instead, we care only about the
747 * explicitly assigned location.
749 ir_variable
*output
= NULL
;
750 if (input
->data
.explicit_location
751 && input
->data
.location
>= VARYING_SLOT_VAR0
) {
753 const glsl_type
*type
= get_varying_type(input
, consumer
->Stage
);
754 unsigned num_elements
= type
->count_attribute_slots(false);
756 compute_variable_location_slot(input
, consumer
->Stage
);
757 unsigned slot_limit
= idx
+ num_elements
;
759 while (idx
< slot_limit
) {
760 if (idx
>= MAX_VARYING
) {
762 "Invalid location %u in %s shader\n", idx
,
763 _mesa_shader_stage_to_string(consumer
->Stage
));
767 output
= explicit_locations
[idx
][input
->data
.location_frac
].var
;
769 if (output
== NULL
||
770 input
->data
.location
!= output
->data
.location
) {
772 "%s shader input `%s' with explicit location "
773 "has no matching output\n",
774 _mesa_shader_stage_to_string(consumer
->Stage
),
781 output
= parameters
.get_variable(input
->name
);
784 if (output
!= NULL
) {
785 /* Interface blocks have their own validation elsewhere so don't
786 * try validating them here.
788 if (!(input
->get_interface_type() &&
789 output
->get_interface_type()))
790 cross_validate_types_and_qualifiers(ctx
, prog
, input
, output
,
794 /* Check for input vars with unmatched output vars in prev stage
795 * taking into account that interface blocks could have a matching
796 * output but with different name, so we ignore them.
798 assert(!input
->data
.assigned
);
799 if (input
->data
.used
&& !input
->get_interface_type() &&
800 !input
->data
.explicit_location
&& !prog
->SeparateShader
)
802 "%s shader input `%s' "
803 "has no matching output in the previous stage\n",
804 _mesa_shader_stage_to_string(consumer
->Stage
),
812 * Demote shader inputs and outputs that are not used in other stages, and
813 * remove them via dead code elimination.
816 remove_unused_shader_inputs_and_outputs(bool is_separate_shader_object
,
817 gl_linked_shader
*sh
,
818 enum ir_variable_mode mode
)
820 if (is_separate_shader_object
)
823 foreach_in_list(ir_instruction
, node
, sh
->ir
) {
824 ir_variable
*const var
= node
->as_variable();
826 if (var
== NULL
|| var
->data
.mode
!= int(mode
))
829 /* A shader 'in' or 'out' variable is only really an input or output if
830 * its value is used by other shader stages. This will cause the
831 * variable to have a location assigned.
833 if (var
->data
.is_unmatched_generic_inout
&& !var
->data
.is_xfb_only
) {
834 assert(var
->data
.mode
!= ir_var_temporary
);
836 /* Assign zeros to demoted inputs to allow more optimizations. */
837 if (var
->data
.mode
== ir_var_shader_in
&& !var
->constant_value
)
838 var
->constant_value
= ir_constant::zero(var
, var
->type
);
840 var
->data
.mode
= ir_var_auto
;
844 /* Eliminate code that is now dead due to unused inputs/outputs being
847 while (do_dead_code(sh
->ir
, false))
853 * Initialize this object based on a string that was passed to
854 * glTransformFeedbackVaryings.
856 * If the input is mal-formed, this call still succeeds, but it sets
857 * this->var_name to a mal-formed input, so tfeedback_decl::find_output_var()
858 * will fail to find any matching variable.
861 tfeedback_decl::init(struct gl_context
*ctx
, const void *mem_ctx
,
864 /* We don't have to be pedantic about what is a valid GLSL variable name,
865 * because any variable with an invalid name can't exist in the IR anyway.
869 this->orig_name
= input
;
870 this->lowered_builtin_array_variable
= none
;
871 this->skip_components
= 0;
872 this->next_buffer_separator
= false;
873 this->matched_candidate
= NULL
;
878 if (ctx
->Extensions
.ARB_transform_feedback3
) {
879 /* Parse gl_NextBuffer. */
880 if (strcmp(input
, "gl_NextBuffer") == 0) {
881 this->next_buffer_separator
= true;
885 /* Parse gl_SkipComponents. */
886 if (strcmp(input
, "gl_SkipComponents1") == 0)
887 this->skip_components
= 1;
888 else if (strcmp(input
, "gl_SkipComponents2") == 0)
889 this->skip_components
= 2;
890 else if (strcmp(input
, "gl_SkipComponents3") == 0)
891 this->skip_components
= 3;
892 else if (strcmp(input
, "gl_SkipComponents4") == 0)
893 this->skip_components
= 4;
895 if (this->skip_components
)
899 /* Parse a declaration. */
900 const char *base_name_end
;
901 long subscript
= parse_program_resource_name(input
, &base_name_end
);
902 this->var_name
= ralloc_strndup(mem_ctx
, input
, base_name_end
- input
);
903 if (this->var_name
== NULL
) {
904 _mesa_error_no_memory(__func__
);
908 if (subscript
>= 0) {
909 this->array_subscript
= subscript
;
910 this->is_subscripted
= true;
912 this->is_subscripted
= false;
915 /* For drivers that lower gl_ClipDistance to gl_ClipDistanceMESA, this
916 * class must behave specially to account for the fact that gl_ClipDistance
917 * is converted from a float[8] to a vec4[2].
919 if (ctx
->Const
.ShaderCompilerOptions
[MESA_SHADER_VERTEX
].LowerCombinedClipCullDistance
&&
920 strcmp(this->var_name
, "gl_ClipDistance") == 0) {
921 this->lowered_builtin_array_variable
= clip_distance
;
923 if (ctx
->Const
.ShaderCompilerOptions
[MESA_SHADER_VERTEX
].LowerCombinedClipCullDistance
&&
924 strcmp(this->var_name
, "gl_CullDistance") == 0) {
925 this->lowered_builtin_array_variable
= cull_distance
;
928 if (ctx
->Const
.LowerTessLevel
&&
929 (strcmp(this->var_name
, "gl_TessLevelOuter") == 0))
930 this->lowered_builtin_array_variable
= tess_level_outer
;
931 if (ctx
->Const
.LowerTessLevel
&&
932 (strcmp(this->var_name
, "gl_TessLevelInner") == 0))
933 this->lowered_builtin_array_variable
= tess_level_inner
;
938 * Determine whether two tfeedback_decl objects refer to the same variable and
939 * array index (if applicable).
942 tfeedback_decl::is_same(const tfeedback_decl
&x
, const tfeedback_decl
&y
)
944 assert(x
.is_varying() && y
.is_varying());
946 if (strcmp(x
.var_name
, y
.var_name
) != 0)
948 if (x
.is_subscripted
!= y
.is_subscripted
)
950 if (x
.is_subscripted
&& x
.array_subscript
!= y
.array_subscript
)
957 * Assign a location and stream ID for this tfeedback_decl object based on the
958 * transform feedback candidate found by find_candidate.
960 * If an error occurs, the error is reported through linker_error() and false
964 tfeedback_decl::assign_location(struct gl_context
*ctx
,
965 struct gl_shader_program
*prog
)
967 assert(this->is_varying());
969 unsigned fine_location
970 = this->matched_candidate
->toplevel_var
->data
.location
* 4
971 + this->matched_candidate
->toplevel_var
->data
.location_frac
972 + this->matched_candidate
->offset
;
973 const unsigned dmul
=
974 this->matched_candidate
->type
->without_array()->is_64bit() ? 2 : 1;
976 if (this->matched_candidate
->type
->is_array()) {
978 const unsigned matrix_cols
=
979 this->matched_candidate
->type
->fields
.array
->matrix_columns
;
980 const unsigned vector_elements
=
981 this->matched_candidate
->type
->fields
.array
->vector_elements
;
982 unsigned actual_array_size
;
983 switch (this->lowered_builtin_array_variable
) {
985 actual_array_size
= prog
->last_vert_prog
?
986 prog
->last_vert_prog
->info
.clip_distance_array_size
: 0;
989 actual_array_size
= prog
->last_vert_prog
?
990 prog
->last_vert_prog
->info
.cull_distance_array_size
: 0;
992 case tess_level_outer
:
993 actual_array_size
= 4;
995 case tess_level_inner
:
996 actual_array_size
= 2;
1000 actual_array_size
= this->matched_candidate
->type
->array_size();
1004 if (this->is_subscripted
) {
1005 /* Check array bounds. */
1006 if (this->array_subscript
>= actual_array_size
) {
1007 linker_error(prog
, "Transform feedback varying %s has index "
1008 "%i, but the array size is %u.",
1009 this->orig_name
, this->array_subscript
,
1013 unsigned array_elem_size
= this->lowered_builtin_array_variable
?
1014 1 : vector_elements
* matrix_cols
* dmul
;
1015 fine_location
+= array_elem_size
* this->array_subscript
;
1018 this->size
= actual_array_size
;
1020 this->vector_elements
= vector_elements
;
1021 this->matrix_columns
= matrix_cols
;
1022 if (this->lowered_builtin_array_variable
)
1023 this->type
= GL_FLOAT
;
1025 this->type
= this->matched_candidate
->type
->fields
.array
->gl_type
;
1027 /* Regular variable (scalar, vector, or matrix) */
1028 if (this->is_subscripted
) {
1029 linker_error(prog
, "Transform feedback varying %s requested, "
1030 "but %s is not an array.",
1031 this->orig_name
, this->var_name
);
1035 this->vector_elements
= this->matched_candidate
->type
->vector_elements
;
1036 this->matrix_columns
= this->matched_candidate
->type
->matrix_columns
;
1037 this->type
= this->matched_candidate
->type
->gl_type
;
1039 this->location
= fine_location
/ 4;
1040 this->location_frac
= fine_location
% 4;
1042 /* From GL_EXT_transform_feedback:
1043 * A program will fail to link if:
1045 * * the total number of components to capture in any varying
1046 * variable in <varyings> is greater than the constant
1047 * MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS_EXT and the
1048 * buffer mode is SEPARATE_ATTRIBS_EXT;
1050 if (prog
->TransformFeedback
.BufferMode
== GL_SEPARATE_ATTRIBS
&&
1051 this->num_components() >
1052 ctx
->Const
.MaxTransformFeedbackSeparateComponents
) {
1053 linker_error(prog
, "Transform feedback varying %s exceeds "
1054 "MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS.",
1059 /* Only transform feedback varyings can be assigned to non-zero streams,
1060 * so assign the stream id here.
1062 this->stream_id
= this->matched_candidate
->toplevel_var
->data
.stream
;
1064 unsigned array_offset
= this->array_subscript
* 4 * dmul
;
1065 unsigned struct_offset
= this->matched_candidate
->offset
* 4 * dmul
;
1066 this->buffer
= this->matched_candidate
->toplevel_var
->data
.xfb_buffer
;
1067 this->offset
= this->matched_candidate
->toplevel_var
->data
.offset
+
1068 array_offset
+ struct_offset
;
1075 tfeedback_decl::get_num_outputs() const
1077 if (!this->is_varying()) {
1080 return (this->num_components() + this->location_frac
+ 3)/4;
1085 * Update gl_transform_feedback_info to reflect this tfeedback_decl.
1087 * If an error occurs, the error is reported through linker_error() and false
1091 tfeedback_decl::store(struct gl_context
*ctx
, struct gl_shader_program
*prog
,
1092 struct gl_transform_feedback_info
*info
,
1093 unsigned buffer
, unsigned buffer_index
,
1094 const unsigned max_outputs
, bool *explicit_stride
,
1095 bool has_xfb_qualifiers
) const
1097 unsigned xfb_offset
= 0;
1098 unsigned size
= this->size
;
1099 /* Handle gl_SkipComponents. */
1100 if (this->skip_components
) {
1101 info
->Buffers
[buffer
].Stride
+= this->skip_components
;
1102 size
= this->skip_components
;
1106 if (this->next_buffer_separator
) {
1111 if (has_xfb_qualifiers
) {
1112 xfb_offset
= this->offset
/ 4;
1114 xfb_offset
= info
->Buffers
[buffer
].Stride
;
1116 info
->Varyings
[info
->NumVarying
].Offset
= xfb_offset
* 4;
1119 unsigned location
= this->location
;
1120 unsigned location_frac
= this->location_frac
;
1121 unsigned num_components
= this->num_components();
1122 while (num_components
> 0) {
1123 unsigned output_size
= MIN2(num_components
, 4 - location_frac
);
1124 assert((info
->NumOutputs
== 0 && max_outputs
== 0) ||
1125 info
->NumOutputs
< max_outputs
);
1127 /* From the ARB_enhanced_layouts spec:
1129 * "If such a block member or variable is not written during a shader
1130 * invocation, the buffer contents at the assigned offset will be
1131 * undefined. Even if there are no static writes to a variable or
1132 * member that is assigned a transform feedback offset, the space is
1133 * still allocated in the buffer and still affects the stride."
1135 if (this->is_varying_written()) {
1136 info
->Outputs
[info
->NumOutputs
].ComponentOffset
= location_frac
;
1137 info
->Outputs
[info
->NumOutputs
].OutputRegister
= location
;
1138 info
->Outputs
[info
->NumOutputs
].NumComponents
= output_size
;
1139 info
->Outputs
[info
->NumOutputs
].StreamId
= stream_id
;
1140 info
->Outputs
[info
->NumOutputs
].OutputBuffer
= buffer
;
1141 info
->Outputs
[info
->NumOutputs
].DstOffset
= xfb_offset
;
1144 info
->Buffers
[buffer
].Stream
= this->stream_id
;
1145 xfb_offset
+= output_size
;
1147 num_components
-= output_size
;
1153 if (explicit_stride
&& explicit_stride
[buffer
]) {
1154 if (this->is_64bit() && info
->Buffers
[buffer
].Stride
% 2) {
1155 linker_error(prog
, "invalid qualifier xfb_stride=%d must be a "
1156 "multiple of 8 as its applied to a type that is or "
1157 "contains a double.",
1158 info
->Buffers
[buffer
].Stride
* 4);
1162 if ((this->offset
/ 4) / info
->Buffers
[buffer
].Stride
!=
1163 (xfb_offset
- 1) / info
->Buffers
[buffer
].Stride
) {
1164 linker_error(prog
, "xfb_offset (%d) overflows xfb_stride (%d) for "
1165 "buffer (%d)", xfb_offset
* 4,
1166 info
->Buffers
[buffer
].Stride
* 4, buffer
);
1170 info
->Buffers
[buffer
].Stride
= xfb_offset
;
1173 /* From GL_EXT_transform_feedback:
1174 * A program will fail to link if:
1176 * * the total number of components to capture is greater than
1177 * the constant MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS_EXT
1178 * and the buffer mode is INTERLEAVED_ATTRIBS_EXT.
1180 * From GL_ARB_enhanced_layouts:
1182 * "The resulting stride (implicit or explicit) must be less than or
1183 * equal to the implementation-dependent constant
1184 * gl_MaxTransformFeedbackInterleavedComponents."
1186 if ((prog
->TransformFeedback
.BufferMode
== GL_INTERLEAVED_ATTRIBS
||
1187 has_xfb_qualifiers
) &&
1188 info
->Buffers
[buffer
].Stride
>
1189 ctx
->Const
.MaxTransformFeedbackInterleavedComponents
) {
1190 linker_error(prog
, "The MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS "
1191 "limit has been exceeded.");
1196 info
->Varyings
[info
->NumVarying
].Name
= ralloc_strdup(prog
,
1198 info
->Varyings
[info
->NumVarying
].Type
= this->type
;
1199 info
->Varyings
[info
->NumVarying
].Size
= size
;
1200 info
->Varyings
[info
->NumVarying
].BufferIndex
= buffer_index
;
1202 info
->Buffers
[buffer
].NumVaryings
++;
1208 const tfeedback_candidate
*
1209 tfeedback_decl::find_candidate(gl_shader_program
*prog
,
1210 hash_table
*tfeedback_candidates
)
1212 const char *name
= this->var_name
;
1213 switch (this->lowered_builtin_array_variable
) {
1215 name
= this->var_name
;
1218 name
= "gl_ClipDistanceMESA";
1221 name
= "gl_CullDistanceMESA";
1223 case tess_level_outer
:
1224 name
= "gl_TessLevelOuterMESA";
1226 case tess_level_inner
:
1227 name
= "gl_TessLevelInnerMESA";
1230 hash_entry
*entry
= _mesa_hash_table_search(tfeedback_candidates
, name
);
1232 this->matched_candidate
= entry
?
1233 (const tfeedback_candidate
*) entry
->data
: NULL
;
1235 if (!this->matched_candidate
) {
1236 /* From GL_EXT_transform_feedback:
1237 * A program will fail to link if:
1239 * * any variable name specified in the <varyings> array is not
1240 * declared as an output in the geometry shader (if present) or
1241 * the vertex shader (if no geometry shader is present);
1243 linker_error(prog
, "Transform feedback varying %s undeclared.",
1247 return this->matched_candidate
;
1252 * Parse all the transform feedback declarations that were passed to
1253 * glTransformFeedbackVaryings() and store them in tfeedback_decl objects.
1255 * If an error occurs, the error is reported through linker_error() and false
1259 parse_tfeedback_decls(struct gl_context
*ctx
, struct gl_shader_program
*prog
,
1260 const void *mem_ctx
, unsigned num_names
,
1261 char **varying_names
, tfeedback_decl
*decls
)
1263 for (unsigned i
= 0; i
< num_names
; ++i
) {
1264 decls
[i
].init(ctx
, mem_ctx
, varying_names
[i
]);
1266 if (!decls
[i
].is_varying())
1269 /* From GL_EXT_transform_feedback:
1270 * A program will fail to link if:
1272 * * any two entries in the <varyings> array specify the same varying
1275 * We interpret this to mean "any two entries in the <varyings> array
1276 * specify the same varying variable and array index", since transform
1277 * feedback of arrays would be useless otherwise.
1279 for (unsigned j
= 0; j
< i
; ++j
) {
1280 if (decls
[j
].is_varying()) {
1281 if (tfeedback_decl::is_same(decls
[i
], decls
[j
])) {
1282 linker_error(prog
, "Transform feedback varying %s specified "
1283 "more than once.", varying_names
[i
]);
1294 cmp_xfb_offset(const void * x_generic
, const void * y_generic
)
1296 tfeedback_decl
*x
= (tfeedback_decl
*) x_generic
;
1297 tfeedback_decl
*y
= (tfeedback_decl
*) y_generic
;
1299 if (x
->get_buffer() != y
->get_buffer())
1300 return x
->get_buffer() - y
->get_buffer();
1301 return x
->get_offset() - y
->get_offset();
1305 * Store transform feedback location assignments into
1306 * prog->sh.LinkedTransformFeedback based on the data stored in
1309 * If an error occurs, the error is reported through linker_error() and false
1313 store_tfeedback_info(struct gl_context
*ctx
, struct gl_shader_program
*prog
,
1314 unsigned num_tfeedback_decls
,
1315 tfeedback_decl
*tfeedback_decls
, bool has_xfb_qualifiers
)
1317 if (!prog
->last_vert_prog
)
1320 /* Make sure MaxTransformFeedbackBuffers is less than 32 so the bitmask for
1321 * tracking the number of buffers doesn't overflow.
1323 assert(ctx
->Const
.MaxTransformFeedbackBuffers
< 32);
1325 bool separate_attribs_mode
=
1326 prog
->TransformFeedback
.BufferMode
== GL_SEPARATE_ATTRIBS
;
1328 struct gl_program
*xfb_prog
= prog
->last_vert_prog
;
1329 xfb_prog
->sh
.LinkedTransformFeedback
=
1330 rzalloc(xfb_prog
, struct gl_transform_feedback_info
);
1332 /* The xfb_offset qualifier does not have to be used in increasing order
1333 * however some drivers expect to receive the list of transform feedback
1334 * declarations in order so sort it now for convenience.
1336 if (has_xfb_qualifiers
) {
1337 qsort(tfeedback_decls
, num_tfeedback_decls
, sizeof(*tfeedback_decls
),
1341 xfb_prog
->sh
.LinkedTransformFeedback
->Varyings
=
1342 rzalloc_array(xfb_prog
, struct gl_transform_feedback_varying_info
,
1343 num_tfeedback_decls
);
1345 unsigned num_outputs
= 0;
1346 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
1347 if (tfeedback_decls
[i
].is_varying_written())
1348 num_outputs
+= tfeedback_decls
[i
].get_num_outputs();
1351 xfb_prog
->sh
.LinkedTransformFeedback
->Outputs
=
1352 rzalloc_array(xfb_prog
, struct gl_transform_feedback_output
,
1355 unsigned num_buffers
= 0;
1356 unsigned buffers
= 0;
1358 if (!has_xfb_qualifiers
&& separate_attribs_mode
) {
1359 /* GL_SEPARATE_ATTRIBS */
1360 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
1361 if (!tfeedback_decls
[i
].store(ctx
, prog
,
1362 xfb_prog
->sh
.LinkedTransformFeedback
,
1363 num_buffers
, num_buffers
, num_outputs
,
1364 NULL
, has_xfb_qualifiers
))
1367 buffers
|= 1 << num_buffers
;
1372 /* GL_INVERLEAVED_ATTRIBS */
1373 int buffer_stream_id
= -1;
1375 num_tfeedback_decls
? tfeedback_decls
[0].get_buffer() : 0;
1376 bool explicit_stride
[MAX_FEEDBACK_BUFFERS
] = { false };
1378 /* Apply any xfb_stride global qualifiers */
1379 if (has_xfb_qualifiers
) {
1380 for (unsigned j
= 0; j
< MAX_FEEDBACK_BUFFERS
; j
++) {
1381 if (prog
->TransformFeedback
.BufferStride
[j
]) {
1382 explicit_stride
[j
] = true;
1383 xfb_prog
->sh
.LinkedTransformFeedback
->Buffers
[j
].Stride
=
1384 prog
->TransformFeedback
.BufferStride
[j
] / 4;
1389 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
1390 if (has_xfb_qualifiers
&&
1391 buffer
!= tfeedback_decls
[i
].get_buffer()) {
1392 /* we have moved to the next buffer so reset stream id */
1393 buffer_stream_id
= -1;
1397 if (tfeedback_decls
[i
].is_next_buffer_separator()) {
1398 if (!tfeedback_decls
[i
].store(ctx
, prog
,
1399 xfb_prog
->sh
.LinkedTransformFeedback
,
1400 buffer
, num_buffers
, num_outputs
,
1401 explicit_stride
, has_xfb_qualifiers
))
1404 buffer_stream_id
= -1;
1408 if (has_xfb_qualifiers
) {
1409 buffer
= tfeedback_decls
[i
].get_buffer();
1411 buffer
= num_buffers
;
1414 if (tfeedback_decls
[i
].is_varying()) {
1415 if (buffer_stream_id
== -1) {
1416 /* First varying writing to this buffer: remember its stream */
1417 buffer_stream_id
= (int) tfeedback_decls
[i
].get_stream_id();
1419 /* Only mark a buffer as active when there is a varying
1420 * attached to it. This behaviour is based on a revised version
1421 * of section 13.2.2 of the GL 4.6 spec.
1423 buffers
|= 1 << buffer
;
1424 } else if (buffer_stream_id
!=
1425 (int) tfeedback_decls
[i
].get_stream_id()) {
1426 /* Varying writes to the same buffer from a different stream */
1428 "Transform feedback can't capture varyings belonging "
1429 "to different vertex streams in a single buffer. "
1430 "Varying %s writes to buffer from stream %u, other "
1431 "varyings in the same buffer write from stream %u.",
1432 tfeedback_decls
[i
].name(),
1433 tfeedback_decls
[i
].get_stream_id(),
1439 if (!tfeedback_decls
[i
].store(ctx
, prog
,
1440 xfb_prog
->sh
.LinkedTransformFeedback
,
1441 buffer
, num_buffers
, num_outputs
,
1442 explicit_stride
, has_xfb_qualifiers
))
1447 assert(xfb_prog
->sh
.LinkedTransformFeedback
->NumOutputs
== num_outputs
);
1449 xfb_prog
->sh
.LinkedTransformFeedback
->ActiveBuffers
= buffers
;
1456 * Data structure recording the relationship between outputs of one shader
1457 * stage (the "producer") and inputs of another (the "consumer").
1459 class varying_matches
1462 varying_matches(bool disable_varying_packing
, bool xfb_enabled
,
1463 bool enhanced_layouts_enabled
,
1464 gl_shader_stage producer_stage
,
1465 gl_shader_stage consumer_stage
);
1467 void record(ir_variable
*producer_var
, ir_variable
*consumer_var
);
1468 unsigned assign_locations(struct gl_shader_program
*prog
,
1469 uint8_t components
[],
1470 uint64_t reserved_slots
);
1471 void store_locations() const;
1474 bool is_varying_packing_safe(const glsl_type
*type
,
1475 const ir_variable
*var
) const;
1478 * If true, this driver disables varying packing, so all varyings need to
1479 * be aligned on slot boundaries, and take up a number of slots equal to
1480 * their number of matrix columns times their array size.
1482 * Packing may also be disabled because our current packing method is not
1483 * safe in SSO or versions of OpenGL where interpolation qualifiers are not
1484 * guaranteed to match across stages.
1486 const bool disable_varying_packing
;
1489 * If true, this driver has transform feedback enabled. The transform
1490 * feedback code requires at least some packing be done even when varying
1491 * packing is disabled, fortunately where transform feedback requires
1492 * packing it's safe to override the disabled setting. See
1493 * is_varying_packing_safe().
1495 const bool xfb_enabled
;
1497 const bool enhanced_layouts_enabled
;
1500 * Enum representing the order in which varyings are packed within a
1503 * Currently we pack vec4's first, then vec2's, then scalar values, then
1504 * vec3's. This order ensures that the only vectors that are at risk of
1505 * having to be "double parked" (split between two adjacent varying slots)
1508 enum packing_order_enum
{
1511 PACKING_ORDER_SCALAR
,
1515 static unsigned compute_packing_class(const ir_variable
*var
);
1516 static packing_order_enum
compute_packing_order(const ir_variable
*var
);
1517 static int match_comparator(const void *x_generic
, const void *y_generic
);
1518 static int xfb_comparator(const void *x_generic
, const void *y_generic
);
1521 * Structure recording the relationship between a single producer output
1522 * and a single consumer input.
1526 * Packing class for this varying, computed by compute_packing_class().
1528 unsigned packing_class
;
1531 * Packing order for this varying, computed by compute_packing_order().
1533 packing_order_enum packing_order
;
1534 unsigned num_components
;
1537 * The output variable in the producer stage.
1539 ir_variable
*producer_var
;
1542 * The input variable in the consumer stage.
1544 ir_variable
*consumer_var
;
1547 * The location which has been assigned for this varying. This is
1548 * expressed in multiples of a float, with the first generic varying
1549 * (i.e. the one referred to by VARYING_SLOT_VAR0) represented by the
1552 unsigned generic_location
;
1556 * The number of elements in the \c matches array that are currently in
1559 unsigned num_matches
;
1562 * The number of elements that were set aside for the \c matches array when
1565 unsigned matches_capacity
;
1567 gl_shader_stage producer_stage
;
1568 gl_shader_stage consumer_stage
;
1571 } /* anonymous namespace */
1573 varying_matches::varying_matches(bool disable_varying_packing
,
1575 bool enhanced_layouts_enabled
,
1576 gl_shader_stage producer_stage
,
1577 gl_shader_stage consumer_stage
)
1578 : disable_varying_packing(disable_varying_packing
),
1579 xfb_enabled(xfb_enabled
),
1580 enhanced_layouts_enabled(enhanced_layouts_enabled
),
1581 producer_stage(producer_stage
),
1582 consumer_stage(consumer_stage
)
1584 /* Note: this initial capacity is rather arbitrarily chosen to be large
1585 * enough for many cases without wasting an unreasonable amount of space.
1586 * varying_matches::record() will resize the array if there are more than
1587 * this number of varyings.
1589 this->matches_capacity
= 8;
1590 this->matches
= (match
*)
1591 malloc(sizeof(*this->matches
) * this->matches_capacity
);
1592 this->num_matches
= 0;
1596 varying_matches::~varying_matches()
1598 free(this->matches
);
1603 * Packing is always safe on individual arrays, structures, and matrices. It
1604 * is also safe if the varying is only used for transform feedback.
1607 varying_matches::is_varying_packing_safe(const glsl_type
*type
,
1608 const ir_variable
*var
) const
1610 if (consumer_stage
== MESA_SHADER_TESS_EVAL
||
1611 consumer_stage
== MESA_SHADER_TESS_CTRL
||
1612 producer_stage
== MESA_SHADER_TESS_CTRL
)
1615 return xfb_enabled
&& (type
->is_array() || type
->is_record() ||
1616 type
->is_matrix() || var
->data
.is_xfb_only
);
1621 * Record the given producer/consumer variable pair in the list of variables
1622 * that should later be assigned locations.
1624 * It is permissible for \c consumer_var to be NULL (this happens if a
1625 * variable is output by the producer and consumed by transform feedback, but
1626 * not consumed by the consumer).
1628 * If \c producer_var has already been paired up with a consumer_var, or
1629 * producer_var is part of fixed pipeline functionality (and hence already has
1630 * a location assigned), this function has no effect.
1632 * Note: as a side effect this function may change the interpolation type of
1633 * \c producer_var, but only when the change couldn't possibly affect
1637 varying_matches::record(ir_variable
*producer_var
, ir_variable
*consumer_var
)
1639 assert(producer_var
!= NULL
|| consumer_var
!= NULL
);
1641 if ((producer_var
&& (!producer_var
->data
.is_unmatched_generic_inout
||
1642 producer_var
->data
.explicit_location
)) ||
1643 (consumer_var
&& (!consumer_var
->data
.is_unmatched_generic_inout
||
1644 consumer_var
->data
.explicit_location
))) {
1645 /* Either a location already exists for this variable (since it is part
1646 * of fixed functionality), or it has already been recorded as part of a
1652 bool needs_flat_qualifier
= consumer_var
== NULL
&&
1653 (producer_var
->type
->contains_integer() ||
1654 producer_var
->type
->contains_double());
1656 if (!disable_varying_packing
&&
1657 (needs_flat_qualifier
||
1658 (consumer_stage
!= MESA_SHADER_NONE
&& consumer_stage
!= MESA_SHADER_FRAGMENT
))) {
1659 /* Since this varying is not being consumed by the fragment shader, its
1660 * interpolation type varying cannot possibly affect rendering.
1661 * Also, this variable is non-flat and is (or contains) an integer
1663 * If the consumer stage is unknown, don't modify the interpolation
1664 * type as it could affect rendering later with separate shaders.
1666 * lower_packed_varyings requires all integer varyings to flat,
1667 * regardless of where they appear. We can trivially satisfy that
1668 * requirement by changing the interpolation type to flat here.
1671 producer_var
->data
.centroid
= false;
1672 producer_var
->data
.sample
= false;
1673 producer_var
->data
.interpolation
= INTERP_MODE_FLAT
;
1677 consumer_var
->data
.centroid
= false;
1678 consumer_var
->data
.sample
= false;
1679 consumer_var
->data
.interpolation
= INTERP_MODE_FLAT
;
1683 if (this->num_matches
== this->matches_capacity
) {
1684 this->matches_capacity
*= 2;
1685 this->matches
= (match
*)
1686 realloc(this->matches
,
1687 sizeof(*this->matches
) * this->matches_capacity
);
1690 /* We must use the consumer to compute the packing class because in GL4.4+
1691 * there is no guarantee interpolation qualifiers will match across stages.
1693 * From Section 4.5 (Interpolation Qualifiers) of the GLSL 4.30 spec:
1695 * "The type and presence of interpolation qualifiers of variables with
1696 * the same name declared in all linked shaders for the same cross-stage
1697 * interface must match, otherwise the link command will fail.
1699 * When comparing an output from one stage to an input of a subsequent
1700 * stage, the input and output don't match if their interpolation
1701 * qualifiers (or lack thereof) are not the same."
1703 * This text was also in at least revison 7 of the 4.40 spec but is no
1704 * longer in revision 9 and not in the 4.50 spec.
1706 const ir_variable
*const var
= (consumer_var
!= NULL
)
1707 ? consumer_var
: producer_var
;
1708 const gl_shader_stage stage
= (consumer_var
!= NULL
)
1709 ? consumer_stage
: producer_stage
;
1710 const glsl_type
*type
= get_varying_type(var
, stage
);
1712 if (producer_var
&& consumer_var
&&
1713 consumer_var
->data
.must_be_shader_input
) {
1714 producer_var
->data
.must_be_shader_input
= 1;
1717 this->matches
[this->num_matches
].packing_class
1718 = this->compute_packing_class(var
);
1719 this->matches
[this->num_matches
].packing_order
1720 = this->compute_packing_order(var
);
1721 if ((this->disable_varying_packing
&& !is_varying_packing_safe(type
, var
)) ||
1722 var
->data
.must_be_shader_input
) {
1723 unsigned slots
= type
->count_attribute_slots(false);
1724 this->matches
[this->num_matches
].num_components
= slots
* 4;
1726 this->matches
[this->num_matches
].num_components
1727 = type
->component_slots();
1730 this->matches
[this->num_matches
].producer_var
= producer_var
;
1731 this->matches
[this->num_matches
].consumer_var
= consumer_var
;
1732 this->num_matches
++;
1734 producer_var
->data
.is_unmatched_generic_inout
= 0;
1736 consumer_var
->data
.is_unmatched_generic_inout
= 0;
1741 * Choose locations for all of the variable matches that were previously
1742 * passed to varying_matches::record().
1743 * \param components returns array[slot] of number of components used
1744 * per slot (1, 2, 3 or 4)
1745 * \param reserved_slots bitmask indicating which varying slots are already
1747 * \return number of slots (4-element vectors) allocated
1750 varying_matches::assign_locations(struct gl_shader_program
*prog
,
1751 uint8_t components
[],
1752 uint64_t reserved_slots
)
1754 /* If packing has been disabled then we cannot safely sort the varyings by
1755 * class as it may mean we are using a version of OpenGL where
1756 * interpolation qualifiers are not guaranteed to be matching across
1757 * shaders, sorting in this case could result in mismatching shader
1759 * When packing is disabled the sort orders varyings used by transform
1760 * feedback first, but also depends on *undefined behaviour* of qsort to
1761 * reverse the order of the varyings. See: xfb_comparator().
1763 if (!this->disable_varying_packing
) {
1764 /* Sort varying matches into an order that makes them easy to pack. */
1765 qsort(this->matches
, this->num_matches
, sizeof(*this->matches
),
1766 &varying_matches::match_comparator
);
1768 /* Only sort varyings that are only used by transform feedback. */
1769 qsort(this->matches
, this->num_matches
, sizeof(*this->matches
),
1770 &varying_matches::xfb_comparator
);
1773 unsigned generic_location
= 0;
1774 unsigned generic_patch_location
= MAX_VARYING
*4;
1775 bool previous_var_xfb_only
= false;
1776 unsigned previous_packing_class
= ~0u;
1778 /* For tranform feedback separate mode, we know the number of attributes
1779 * is <= the number of buffers. So packing isn't critical. In fact,
1780 * packing vec3 attributes can cause trouble because splitting a vec3
1781 * effectively creates an additional transform feedback output. The
1782 * extra TFB output may exceed device driver limits.
1784 const bool dont_pack_vec3
=
1785 (prog
->TransformFeedback
.BufferMode
== GL_SEPARATE_ATTRIBS
&&
1786 prog
->TransformFeedback
.NumVarying
> 0);
1788 for (unsigned i
= 0; i
< this->num_matches
; i
++) {
1789 unsigned *location
= &generic_location
;
1790 const ir_variable
*var
;
1791 const glsl_type
*type
;
1792 bool is_vertex_input
= false;
1794 if (matches
[i
].consumer_var
) {
1795 var
= matches
[i
].consumer_var
;
1796 type
= get_varying_type(var
, consumer_stage
);
1797 if (consumer_stage
== MESA_SHADER_VERTEX
)
1798 is_vertex_input
= true;
1800 var
= matches
[i
].producer_var
;
1801 type
= get_varying_type(var
, producer_stage
);
1804 if (var
->data
.patch
)
1805 location
= &generic_patch_location
;
1807 /* Advance to the next slot if this varying has a different packing
1808 * class than the previous one, and we're not already on a slot
1811 * Also advance to the next slot if packing is disabled. This makes sure
1812 * we don't assign varyings the same locations which is possible
1813 * because we still pack individual arrays, records and matrices even
1814 * when packing is disabled. Note we don't advance to the next slot if
1815 * we can pack varyings together that are only used for transform
1818 if (var
->data
.must_be_shader_input
||
1819 (this->disable_varying_packing
&&
1820 !(previous_var_xfb_only
&& var
->data
.is_xfb_only
)) ||
1821 (previous_packing_class
!= this->matches
[i
].packing_class
) ||
1822 (this->matches
[i
].packing_order
== PACKING_ORDER_VEC3
&&
1824 *location
= ALIGN(*location
, 4);
1827 previous_var_xfb_only
= var
->data
.is_xfb_only
;
1828 previous_packing_class
= this->matches
[i
].packing_class
;
1830 /* The number of components taken up by this variable. For vertex shader
1831 * inputs, we use the number of slots * 4, as they have different
1834 unsigned num_components
= is_vertex_input
?
1835 type
->count_attribute_slots(is_vertex_input
) * 4 :
1836 this->matches
[i
].num_components
;
1838 /* The last slot for this variable, inclusive. */
1839 unsigned slot_end
= *location
+ num_components
- 1;
1841 /* FIXME: We could be smarter in the below code and loop back over
1842 * trying to fill any locations that we skipped because we couldn't pack
1843 * the varying between an explicit location. For now just let the user
1844 * hit the linking error if we run out of room and suggest they use
1845 * explicit locations.
1847 while (slot_end
< MAX_VARYING
* 4u) {
1848 const unsigned slots
= (slot_end
/ 4u) - (*location
/ 4u) + 1;
1849 const uint64_t slot_mask
= ((1ull << slots
) - 1) << (*location
/ 4u);
1853 if ((reserved_slots
& slot_mask
) == 0) {
1857 *location
= ALIGN(*location
+ 1, 4);
1858 slot_end
= *location
+ num_components
- 1;
1861 if (!var
->data
.patch
&& slot_end
>= MAX_VARYING
* 4u) {
1862 linker_error(prog
, "insufficient contiguous locations available for "
1863 "%s it is possible an array or struct could not be "
1864 "packed between varyings with explicit locations. Try "
1865 "using an explicit location for arrays and structs.",
1869 if (slot_end
< MAX_VARYINGS_INCL_PATCH
* 4u) {
1870 for (unsigned j
= *location
/ 4u; j
< slot_end
/ 4u; j
++)
1872 components
[slot_end
/ 4u] = (slot_end
& 3) + 1;
1875 this->matches
[i
].generic_location
= *location
;
1877 *location
= slot_end
+ 1;
1880 return (generic_location
+ 3) / 4;
1885 * Update the producer and consumer shaders to reflect the locations
1886 * assignments that were made by varying_matches::assign_locations().
1889 varying_matches::store_locations() const
1891 /* Check is location needs to be packed with lower_packed_varyings() or if
1892 * we can just use ARB_enhanced_layouts packing.
1894 bool pack_loc
[MAX_VARYINGS_INCL_PATCH
] = { 0 };
1895 const glsl_type
*loc_type
[MAX_VARYINGS_INCL_PATCH
][4] = { {NULL
, NULL
} };
1897 for (unsigned i
= 0; i
< this->num_matches
; i
++) {
1898 ir_variable
*producer_var
= this->matches
[i
].producer_var
;
1899 ir_variable
*consumer_var
= this->matches
[i
].consumer_var
;
1900 unsigned generic_location
= this->matches
[i
].generic_location
;
1901 unsigned slot
= generic_location
/ 4;
1902 unsigned offset
= generic_location
% 4;
1905 producer_var
->data
.location
= VARYING_SLOT_VAR0
+ slot
;
1906 producer_var
->data
.location_frac
= offset
;
1910 assert(consumer_var
->data
.location
== -1);
1911 consumer_var
->data
.location
= VARYING_SLOT_VAR0
+ slot
;
1912 consumer_var
->data
.location_frac
= offset
;
1915 /* Find locations suitable for native packing via
1916 * ARB_enhanced_layouts.
1918 if (producer_var
&& consumer_var
) {
1919 if (enhanced_layouts_enabled
) {
1920 const glsl_type
*type
=
1921 get_varying_type(producer_var
, producer_stage
);
1922 if (type
->is_array() || type
->is_matrix() || type
->is_record() ||
1923 type
->is_double()) {
1924 unsigned comp_slots
= type
->component_slots() + offset
;
1925 unsigned slots
= comp_slots
/ 4;
1929 for (unsigned j
= 0; j
< slots
; j
++) {
1930 pack_loc
[slot
+ j
] = true;
1932 } else if (offset
+ type
->vector_elements
> 4) {
1933 pack_loc
[slot
] = true;
1934 pack_loc
[slot
+ 1] = true;
1936 loc_type
[slot
][offset
] = type
;
1942 /* Attempt to use ARB_enhanced_layouts for more efficient packing if
1945 if (enhanced_layouts_enabled
) {
1946 for (unsigned i
= 0; i
< this->num_matches
; i
++) {
1947 ir_variable
*producer_var
= this->matches
[i
].producer_var
;
1948 ir_variable
*consumer_var
= this->matches
[i
].consumer_var
;
1949 unsigned generic_location
= this->matches
[i
].generic_location
;
1950 unsigned slot
= generic_location
/ 4;
1952 if (pack_loc
[slot
] || !producer_var
|| !consumer_var
)
1955 const glsl_type
*type
=
1956 get_varying_type(producer_var
, producer_stage
);
1957 bool type_match
= true;
1958 for (unsigned j
= 0; j
< 4; j
++) {
1959 if (loc_type
[slot
][j
]) {
1960 if (type
->base_type
!= loc_type
[slot
][j
]->base_type
)
1966 producer_var
->data
.explicit_location
= 1;
1967 consumer_var
->data
.explicit_location
= 1;
1968 producer_var
->data
.explicit_component
= 1;
1969 consumer_var
->data
.explicit_component
= 1;
1977 * Compute the "packing class" of the given varying. This is an unsigned
1978 * integer with the property that two variables in the same packing class can
1979 * be safely backed into the same vec4.
1982 varying_matches::compute_packing_class(const ir_variable
*var
)
1984 /* Without help from the back-end, there is no way to pack together
1985 * variables with different interpolation types, because
1986 * lower_packed_varyings must choose exactly one interpolation type for
1987 * each packed varying it creates.
1989 * However, we can safely pack together floats, ints, and uints, because:
1991 * - varyings of base type "int" and "uint" must use the "flat"
1992 * interpolation type, which can only occur in GLSL 1.30 and above.
1994 * - On platforms that support GLSL 1.30 and above, lower_packed_varyings
1995 * can store flat floats as ints without losing any information (using
1996 * the ir_unop_bitcast_* opcodes).
1998 * Therefore, the packing class depends only on the interpolation type.
2000 const unsigned interp
= var
->is_interpolation_flat()
2001 ? unsigned(INTERP_MODE_FLAT
) : var
->data
.interpolation
;
2003 assert(interp
< (1 << 3));
2005 const unsigned packing_class
= (interp
<< 0) |
2006 (var
->data
.centroid
<< 3) |
2007 (var
->data
.sample
<< 4) |
2008 (var
->data
.patch
<< 5) |
2009 (var
->data
.must_be_shader_input
<< 6);
2011 return packing_class
;
2016 * Compute the "packing order" of the given varying. This is a sort key we
2017 * use to determine when to attempt to pack the given varying relative to
2018 * other varyings in the same packing class.
2020 varying_matches::packing_order_enum
2021 varying_matches::compute_packing_order(const ir_variable
*var
)
2023 const glsl_type
*element_type
= var
->type
;
2025 while (element_type
->is_array()) {
2026 element_type
= element_type
->fields
.array
;
2029 switch (element_type
->component_slots() % 4) {
2030 case 1: return PACKING_ORDER_SCALAR
;
2031 case 2: return PACKING_ORDER_VEC2
;
2032 case 3: return PACKING_ORDER_VEC3
;
2033 case 0: return PACKING_ORDER_VEC4
;
2035 assert(!"Unexpected value of vector_elements");
2036 return PACKING_ORDER_VEC4
;
2042 * Comparison function passed to qsort() to sort varyings by packing_class and
2043 * then by packing_order.
2046 varying_matches::match_comparator(const void *x_generic
, const void *y_generic
)
2048 const match
*x
= (const match
*) x_generic
;
2049 const match
*y
= (const match
*) y_generic
;
2051 if (x
->packing_class
!= y
->packing_class
)
2052 return x
->packing_class
- y
->packing_class
;
2053 return x
->packing_order
- y
->packing_order
;
2058 * Comparison function passed to qsort() to sort varyings used only by
2059 * transform feedback when packing of other varyings is disabled.
2062 varying_matches::xfb_comparator(const void *x_generic
, const void *y_generic
)
2064 const match
*x
= (const match
*) x_generic
;
2066 if (x
->producer_var
!= NULL
&& x
->producer_var
->data
.is_xfb_only
)
2067 return match_comparator(x_generic
, y_generic
);
2069 /* FIXME: When the comparator returns 0 it means the elements being
2070 * compared are equivalent. However the qsort documentation says:
2072 * "The order of equivalent elements is undefined."
2074 * In practice the sort ends up reversing the order of the varyings which
2075 * means locations are also assigned in this reversed order and happens to
2076 * be what we want. This is also whats happening in
2077 * varying_matches::match_comparator().
2084 * Is the given variable a varying variable to be counted against the
2085 * limit in ctx->Const.MaxVarying?
2086 * This includes variables such as texcoords, colors and generic
2087 * varyings, but excludes variables such as gl_FrontFacing and gl_FragCoord.
2090 var_counts_against_varying_limit(gl_shader_stage stage
, const ir_variable
*var
)
2092 /* Only fragment shaders will take a varying variable as an input */
2093 if (stage
== MESA_SHADER_FRAGMENT
&&
2094 var
->data
.mode
== ir_var_shader_in
) {
2095 switch (var
->data
.location
) {
2096 case VARYING_SLOT_POS
:
2097 case VARYING_SLOT_FACE
:
2098 case VARYING_SLOT_PNTC
:
2109 * Visitor class that generates tfeedback_candidate structs describing all
2110 * possible targets of transform feedback.
2112 * tfeedback_candidate structs are stored in the hash table
2113 * tfeedback_candidates, which is passed to the constructor. This hash table
2114 * maps varying names to instances of the tfeedback_candidate struct.
2116 class tfeedback_candidate_generator
: public program_resource_visitor
2119 tfeedback_candidate_generator(void *mem_ctx
,
2120 hash_table
*tfeedback_candidates
)
2122 tfeedback_candidates(tfeedback_candidates
),
2128 void process(ir_variable
*var
)
2130 /* All named varying interface blocks should be flattened by now */
2131 assert(!var
->is_interface_instance());
2133 this->toplevel_var
= var
;
2134 this->varying_floats
= 0;
2135 program_resource_visitor::process(var
, false);
2139 virtual void visit_field(const glsl_type
*type
, const char *name
,
2140 bool /* row_major */,
2141 const glsl_type
* /* record_type */,
2142 const enum glsl_interface_packing
,
2143 bool /* last_field */)
2145 assert(!type
->without_array()->is_record());
2146 assert(!type
->without_array()->is_interface());
2148 tfeedback_candidate
*candidate
2149 = rzalloc(this->mem_ctx
, tfeedback_candidate
);
2150 candidate
->toplevel_var
= this->toplevel_var
;
2151 candidate
->type
= type
;
2152 candidate
->offset
= this->varying_floats
;
2153 _mesa_hash_table_insert(this->tfeedback_candidates
,
2154 ralloc_strdup(this->mem_ctx
, name
),
2156 this->varying_floats
+= type
->component_slots();
2160 * Memory context used to allocate hash table keys and values.
2162 void * const mem_ctx
;
2165 * Hash table in which tfeedback_candidate objects should be stored.
2167 hash_table
* const tfeedback_candidates
;
2170 * Pointer to the toplevel variable that is being traversed.
2172 ir_variable
*toplevel_var
;
2175 * Total number of varying floats that have been visited so far. This is
2176 * used to determine the offset to each varying within the toplevel
2179 unsigned varying_floats
;
2186 populate_consumer_input_sets(void *mem_ctx
, exec_list
*ir
,
2187 hash_table
*consumer_inputs
,
2188 hash_table
*consumer_interface_inputs
,
2189 ir_variable
*consumer_inputs_with_locations
[VARYING_SLOT_TESS_MAX
])
2191 memset(consumer_inputs_with_locations
,
2193 sizeof(consumer_inputs_with_locations
[0]) * VARYING_SLOT_TESS_MAX
);
2195 foreach_in_list(ir_instruction
, node
, ir
) {
2196 ir_variable
*const input_var
= node
->as_variable();
2198 if (input_var
!= NULL
&& input_var
->data
.mode
== ir_var_shader_in
) {
2199 /* All interface blocks should have been lowered by this point */
2200 assert(!input_var
->type
->is_interface());
2202 if (input_var
->data
.explicit_location
) {
2203 /* assign_varying_locations only cares about finding the
2204 * ir_variable at the start of a contiguous location block.
2206 * - For !producer, consumer_inputs_with_locations isn't used.
2208 * - For !consumer, consumer_inputs_with_locations is empty.
2210 * For consumer && producer, if you were trying to set some
2211 * ir_variable to the middle of a location block on the other side
2212 * of producer/consumer, cross_validate_outputs_to_inputs() should
2213 * be link-erroring due to either type mismatch or location
2214 * overlaps. If the variables do match up, then they've got a
2215 * matching data.location and you only looked at
2216 * consumer_inputs_with_locations[var->data.location], not any
2217 * following entries for the array/structure.
2219 consumer_inputs_with_locations
[input_var
->data
.location
] =
2221 } else if (input_var
->get_interface_type() != NULL
) {
2222 char *const iface_field_name
=
2223 ralloc_asprintf(mem_ctx
, "%s.%s",
2224 input_var
->get_interface_type()->without_array()->name
,
2226 _mesa_hash_table_insert(consumer_interface_inputs
,
2227 iface_field_name
, input_var
);
2229 _mesa_hash_table_insert(consumer_inputs
,
2230 ralloc_strdup(mem_ctx
, input_var
->name
),
2238 * Find a variable from the consumer that "matches" the specified variable
2240 * This function only finds inputs with names that match. There is no
2241 * validation (here) that the types, etc. are compatible.
2244 get_matching_input(void *mem_ctx
,
2245 const ir_variable
*output_var
,
2246 hash_table
*consumer_inputs
,
2247 hash_table
*consumer_interface_inputs
,
2248 ir_variable
*consumer_inputs_with_locations
[VARYING_SLOT_TESS_MAX
])
2250 ir_variable
*input_var
;
2252 if (output_var
->data
.explicit_location
) {
2253 input_var
= consumer_inputs_with_locations
[output_var
->data
.location
];
2254 } else if (output_var
->get_interface_type() != NULL
) {
2255 char *const iface_field_name
=
2256 ralloc_asprintf(mem_ctx
, "%s.%s",
2257 output_var
->get_interface_type()->without_array()->name
,
2259 hash_entry
*entry
= _mesa_hash_table_search(consumer_interface_inputs
, iface_field_name
);
2260 input_var
= entry
? (ir_variable
*) entry
->data
: NULL
;
2262 hash_entry
*entry
= _mesa_hash_table_search(consumer_inputs
, output_var
->name
);
2263 input_var
= entry
? (ir_variable
*) entry
->data
: NULL
;
2266 return (input_var
== NULL
|| input_var
->data
.mode
!= ir_var_shader_in
)
2273 io_variable_cmp(const void *_a
, const void *_b
)
2275 const ir_variable
*const a
= *(const ir_variable
**) _a
;
2276 const ir_variable
*const b
= *(const ir_variable
**) _b
;
2278 if (a
->data
.explicit_location
&& b
->data
.explicit_location
)
2279 return b
->data
.location
- a
->data
.location
;
2281 if (a
->data
.explicit_location
&& !b
->data
.explicit_location
)
2284 if (!a
->data
.explicit_location
&& b
->data
.explicit_location
)
2287 return -strcmp(a
->name
, b
->name
);
2291 * Sort the shader IO variables into canonical order
2294 canonicalize_shader_io(exec_list
*ir
, enum ir_variable_mode io_mode
)
2296 ir_variable
*var_table
[MAX_PROGRAM_OUTPUTS
* 4];
2297 unsigned num_variables
= 0;
2299 foreach_in_list(ir_instruction
, node
, ir
) {
2300 ir_variable
*const var
= node
->as_variable();
2302 if (var
== NULL
|| var
->data
.mode
!= io_mode
)
2305 /* If we have already encountered more I/O variables that could
2306 * successfully link, bail.
2308 if (num_variables
== ARRAY_SIZE(var_table
))
2311 var_table
[num_variables
++] = var
;
2314 if (num_variables
== 0)
2317 /* Sort the list in reverse order (io_variable_cmp handles this). Later
2318 * we're going to push the variables on to the IR list as a stack, so we
2319 * want the last variable (in canonical order) to be first in the list.
2321 qsort(var_table
, num_variables
, sizeof(var_table
[0]), io_variable_cmp
);
2323 /* Remove the variable from it's current location in the IR, and put it at
2326 for (unsigned i
= 0; i
< num_variables
; i
++) {
2327 var_table
[i
]->remove();
2328 ir
->push_head(var_table
[i
]);
2333 * Generate a bitfield map of the explicit locations for shader varyings.
2335 * Note: For Tessellation shaders we are sitting right on the limits of the
2336 * 64 bit map. Per-vertex and per-patch both have separate location domains
2337 * with a max of MAX_VARYING.
2340 reserved_varying_slot(struct gl_linked_shader
*stage
,
2341 ir_variable_mode io_mode
)
2343 assert(io_mode
== ir_var_shader_in
|| io_mode
== ir_var_shader_out
);
2344 /* Avoid an overflow of the returned value */
2345 assert(MAX_VARYINGS_INCL_PATCH
<= 64);
2353 foreach_in_list(ir_instruction
, node
, stage
->ir
) {
2354 ir_variable
*const var
= node
->as_variable();
2356 if (var
== NULL
|| var
->data
.mode
!= io_mode
||
2357 !var
->data
.explicit_location
||
2358 var
->data
.location
< VARYING_SLOT_VAR0
)
2361 var_slot
= var
->data
.location
- VARYING_SLOT_VAR0
;
2363 unsigned num_elements
= get_varying_type(var
, stage
->Stage
)
2364 ->count_attribute_slots(io_mode
== ir_var_shader_in
&&
2365 stage
->Stage
== MESA_SHADER_VERTEX
);
2366 for (unsigned i
= 0; i
< num_elements
; i
++) {
2367 if (var_slot
>= 0 && var_slot
< MAX_VARYINGS_INCL_PATCH
)
2368 slots
|= UINT64_C(1) << var_slot
;
2378 * Assign locations for all variables that are produced in one pipeline stage
2379 * (the "producer") and consumed in the next stage (the "consumer").
2381 * Variables produced by the producer may also be consumed by transform
2384 * \param num_tfeedback_decls is the number of declarations indicating
2385 * variables that may be consumed by transform feedback.
2387 * \param tfeedback_decls is a pointer to an array of tfeedback_decl objects
2388 * representing the result of parsing the strings passed to
2389 * glTransformFeedbackVaryings(). assign_location() will be called for
2390 * each of these objects that matches one of the outputs of the
2393 * When num_tfeedback_decls is nonzero, it is permissible for the consumer to
2394 * be NULL. In this case, varying locations are assigned solely based on the
2395 * requirements of transform feedback.
2398 assign_varying_locations(struct gl_context
*ctx
,
2400 struct gl_shader_program
*prog
,
2401 gl_linked_shader
*producer
,
2402 gl_linked_shader
*consumer
,
2403 unsigned num_tfeedback_decls
,
2404 tfeedback_decl
*tfeedback_decls
,
2405 const uint64_t reserved_slots
)
2407 /* Tessellation shaders treat inputs and outputs as shared memory and can
2408 * access inputs and outputs of other invocations.
2409 * Therefore, they can't be lowered to temps easily (and definitely not
2412 bool unpackable_tess
=
2413 (consumer
&& consumer
->Stage
== MESA_SHADER_TESS_EVAL
) ||
2414 (consumer
&& consumer
->Stage
== MESA_SHADER_TESS_CTRL
) ||
2415 (producer
&& producer
->Stage
== MESA_SHADER_TESS_CTRL
);
2417 /* Transform feedback code assumes varying arrays are packed, so if the
2418 * driver has disabled varying packing, make sure to at least enable
2419 * packing required by transform feedback.
2422 ctx
->Extensions
.EXT_transform_feedback
&& !unpackable_tess
;
2424 /* Disable packing on outward facing interfaces for SSO because in ES we
2425 * need to retain the unpacked varying information for draw time
2428 * Packing is still enabled on individual arrays, structs, and matrices as
2429 * these are required by the transform feedback code and it is still safe
2430 * to do so. We also enable packing when a varying is only used for
2431 * transform feedback and its not a SSO.
2433 bool disable_varying_packing
=
2434 ctx
->Const
.DisableVaryingPacking
|| unpackable_tess
;
2435 if (prog
->SeparateShader
&& (producer
== NULL
|| consumer
== NULL
))
2436 disable_varying_packing
= true;
2438 varying_matches
matches(disable_varying_packing
, xfb_enabled
,
2439 ctx
->Extensions
.ARB_enhanced_layouts
,
2440 producer
? producer
->Stage
: MESA_SHADER_NONE
,
2441 consumer
? consumer
->Stage
: MESA_SHADER_NONE
);
2442 hash_table
*tfeedback_candidates
=
2443 _mesa_hash_table_create(NULL
, _mesa_key_hash_string
,
2444 _mesa_key_string_equal
);
2445 hash_table
*consumer_inputs
=
2446 _mesa_hash_table_create(NULL
, _mesa_key_hash_string
,
2447 _mesa_key_string_equal
);
2448 hash_table
*consumer_interface_inputs
=
2449 _mesa_hash_table_create(NULL
, _mesa_key_hash_string
,
2450 _mesa_key_string_equal
);
2451 ir_variable
*consumer_inputs_with_locations
[VARYING_SLOT_TESS_MAX
] = {
2455 unsigned consumer_vertices
= 0;
2456 if (consumer
&& consumer
->Stage
== MESA_SHADER_GEOMETRY
)
2457 consumer_vertices
= prog
->Geom
.VerticesIn
;
2459 /* Operate in a total of four passes.
2461 * 1. Sort inputs / outputs into a canonical order. This is necessary so
2462 * that inputs / outputs of separable shaders will be assigned
2463 * predictable locations regardless of the order in which declarations
2464 * appeared in the shader source.
2466 * 2. Assign locations for any matching inputs and outputs.
2468 * 3. Mark output variables in the producer that do not have locations as
2469 * not being outputs. This lets the optimizer eliminate them.
2471 * 4. Mark input variables in the consumer that do not have locations as
2472 * not being inputs. This lets the optimizer eliminate them.
2475 canonicalize_shader_io(consumer
->ir
, ir_var_shader_in
);
2478 canonicalize_shader_io(producer
->ir
, ir_var_shader_out
);
2481 linker::populate_consumer_input_sets(mem_ctx
, consumer
->ir
,
2483 consumer_interface_inputs
,
2484 consumer_inputs_with_locations
);
2487 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
2488 ir_variable
*const output_var
= node
->as_variable();
2490 if (output_var
== NULL
|| output_var
->data
.mode
!= ir_var_shader_out
)
2493 /* Only geometry shaders can use non-zero streams */
2494 assert(output_var
->data
.stream
== 0 ||
2495 (output_var
->data
.stream
< MAX_VERTEX_STREAMS
&&
2496 producer
->Stage
== MESA_SHADER_GEOMETRY
));
2498 if (num_tfeedback_decls
> 0) {
2499 tfeedback_candidate_generator
g(mem_ctx
, tfeedback_candidates
);
2500 g
.process(output_var
);
2503 ir_variable
*const input_var
=
2504 linker::get_matching_input(mem_ctx
, output_var
, consumer_inputs
,
2505 consumer_interface_inputs
,
2506 consumer_inputs_with_locations
);
2508 /* If a matching input variable was found, add this output (and the
2509 * input) to the set. If this is a separable program and there is no
2510 * consumer stage, add the output.
2512 * Always add TCS outputs. They are shared by all invocations
2513 * within a patch and can be used as shared memory.
2515 if (input_var
|| (prog
->SeparateShader
&& consumer
== NULL
) ||
2516 producer
->Stage
== MESA_SHADER_TESS_CTRL
) {
2517 matches
.record(output_var
, input_var
);
2520 /* Only stream 0 outputs can be consumed in the next stage */
2521 if (input_var
&& output_var
->data
.stream
!= 0) {
2522 linker_error(prog
, "output %s is assigned to stream=%d but "
2523 "is linked to an input, which requires stream=0",
2524 output_var
->name
, output_var
->data
.stream
);
2529 /* If there's no producer stage, then this must be a separable program.
2530 * For example, we may have a program that has just a fragment shader.
2531 * Later this program will be used with some arbitrary vertex (or
2532 * geometry) shader program. This means that locations must be assigned
2533 * for all the inputs.
2535 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
2536 ir_variable
*const input_var
= node
->as_variable();
2537 if (input_var
&& input_var
->data
.mode
== ir_var_shader_in
) {
2538 matches
.record(NULL
, input_var
);
2543 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
2544 if (!tfeedback_decls
[i
].is_varying())
2547 const tfeedback_candidate
*matched_candidate
2548 = tfeedback_decls
[i
].find_candidate(prog
, tfeedback_candidates
);
2550 if (matched_candidate
== NULL
) {
2551 _mesa_hash_table_destroy(tfeedback_candidates
, NULL
);
2555 /* Mark xfb varyings as always active */
2556 matched_candidate
->toplevel_var
->data
.always_active_io
= 1;
2558 /* Mark any corresponding inputs as always active also. We must do this
2559 * because we have a NIR pass that lowers vectors to scalars and another
2560 * that removes unused varyings.
2561 * We don't split varyings marked as always active because there is no
2562 * point in doing so. This means we need to mark both sides of the
2563 * interface as always active otherwise we will have a mismatch and
2564 * start removing things we shouldn't.
2566 ir_variable
*const input_var
=
2567 linker::get_matching_input(mem_ctx
, matched_candidate
->toplevel_var
,
2569 consumer_interface_inputs
,
2570 consumer_inputs_with_locations
);
2572 input_var
->data
.always_active_io
= 1;
2574 if (matched_candidate
->toplevel_var
->data
.is_unmatched_generic_inout
) {
2575 matched_candidate
->toplevel_var
->data
.is_xfb_only
= 1;
2576 matches
.record(matched_candidate
->toplevel_var
, NULL
);
2580 _mesa_hash_table_destroy(consumer_inputs
, NULL
);
2581 _mesa_hash_table_destroy(consumer_interface_inputs
, NULL
);
2583 uint8_t components
[MAX_VARYINGS_INCL_PATCH
] = {0};
2584 const unsigned slots_used
= matches
.assign_locations(
2585 prog
, components
, reserved_slots
);
2586 matches
.store_locations();
2588 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
2589 if (tfeedback_decls
[i
].is_varying()) {
2590 if (!tfeedback_decls
[i
].assign_location(ctx
, prog
)) {
2591 _mesa_hash_table_destroy(tfeedback_candidates
, NULL
);
2596 _mesa_hash_table_destroy(tfeedback_candidates
, NULL
);
2598 if (consumer
&& producer
) {
2599 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
2600 ir_variable
*const var
= node
->as_variable();
2602 if (var
&& var
->data
.mode
== ir_var_shader_in
&&
2603 var
->data
.is_unmatched_generic_inout
) {
2604 if (!prog
->IsES
&& prog
->data
->Version
<= 120) {
2605 /* On page 25 (page 31 of the PDF) of the GLSL 1.20 spec:
2607 * Only those varying variables used (i.e. read) in
2608 * the fragment shader executable must be written to
2609 * by the vertex shader executable; declaring
2610 * superfluous varying variables in a vertex shader is
2613 * We interpret this text as meaning that the VS must
2614 * write the variable for the FS to read it. See
2615 * "glsl1-varying read but not written" in piglit.
2617 linker_error(prog
, "%s shader varying %s not written "
2619 _mesa_shader_stage_to_string(consumer
->Stage
),
2621 _mesa_shader_stage_to_string(producer
->Stage
));
2623 linker_warning(prog
, "%s shader varying %s not written "
2625 _mesa_shader_stage_to_string(consumer
->Stage
),
2627 _mesa_shader_stage_to_string(producer
->Stage
));
2632 /* Now that validation is done its safe to remove unused varyings. As
2633 * we have both a producer and consumer its safe to remove unused
2634 * varyings even if the program is a SSO because the stages are being
2635 * linked together i.e. we have a multi-stage SSO.
2637 remove_unused_shader_inputs_and_outputs(false, producer
,
2639 remove_unused_shader_inputs_and_outputs(false, consumer
,
2644 lower_packed_varyings(mem_ctx
, slots_used
, components
, ir_var_shader_out
,
2645 0, producer
, disable_varying_packing
,
2650 lower_packed_varyings(mem_ctx
, slots_used
, components
, ir_var_shader_in
,
2651 consumer_vertices
, consumer
,
2652 disable_varying_packing
, xfb_enabled
);
2659 check_against_output_limit(struct gl_context
*ctx
,
2660 struct gl_shader_program
*prog
,
2661 gl_linked_shader
*producer
,
2662 unsigned num_explicit_locations
)
2664 unsigned output_vectors
= num_explicit_locations
;
2666 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
2667 ir_variable
*const var
= node
->as_variable();
2669 if (var
&& !var
->data
.explicit_location
&&
2670 var
->data
.mode
== ir_var_shader_out
&&
2671 var_counts_against_varying_limit(producer
->Stage
, var
)) {
2672 /* outputs for fragment shader can't be doubles */
2673 output_vectors
+= var
->type
->count_attribute_slots(false);
2677 assert(producer
->Stage
!= MESA_SHADER_FRAGMENT
);
2678 unsigned max_output_components
=
2679 ctx
->Const
.Program
[producer
->Stage
].MaxOutputComponents
;
2681 const unsigned output_components
= output_vectors
* 4;
2682 if (output_components
> max_output_components
) {
2683 if (ctx
->API
== API_OPENGLES2
|| prog
->IsES
)
2684 linker_error(prog
, "%s shader uses too many output vectors "
2686 _mesa_shader_stage_to_string(producer
->Stage
),
2688 max_output_components
/ 4);
2690 linker_error(prog
, "%s shader uses too many output components "
2692 _mesa_shader_stage_to_string(producer
->Stage
),
2694 max_output_components
);
2703 check_against_input_limit(struct gl_context
*ctx
,
2704 struct gl_shader_program
*prog
,
2705 gl_linked_shader
*consumer
,
2706 unsigned num_explicit_locations
)
2708 unsigned input_vectors
= num_explicit_locations
;
2710 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
2711 ir_variable
*const var
= node
->as_variable();
2713 if (var
&& !var
->data
.explicit_location
&&
2714 var
->data
.mode
== ir_var_shader_in
&&
2715 var_counts_against_varying_limit(consumer
->Stage
, var
)) {
2716 /* vertex inputs aren't varying counted */
2717 input_vectors
+= var
->type
->count_attribute_slots(false);
2721 assert(consumer
->Stage
!= MESA_SHADER_VERTEX
);
2722 unsigned max_input_components
=
2723 ctx
->Const
.Program
[consumer
->Stage
].MaxInputComponents
;
2725 const unsigned input_components
= input_vectors
* 4;
2726 if (input_components
> max_input_components
) {
2727 if (ctx
->API
== API_OPENGLES2
|| prog
->IsES
)
2728 linker_error(prog
, "%s shader uses too many input vectors "
2730 _mesa_shader_stage_to_string(consumer
->Stage
),
2732 max_input_components
/ 4);
2734 linker_error(prog
, "%s shader uses too many input components "
2736 _mesa_shader_stage_to_string(consumer
->Stage
),
2738 max_input_components
);
2747 link_varyings(struct gl_shader_program
*prog
, unsigned first
, unsigned last
,
2748 struct gl_context
*ctx
, void *mem_ctx
)
2750 bool has_xfb_qualifiers
= false;
2751 unsigned num_tfeedback_decls
= 0;
2752 char **varying_names
= NULL
;
2753 tfeedback_decl
*tfeedback_decls
= NULL
;
2755 /* From the ARB_enhanced_layouts spec:
2757 * "If the shader used to record output variables for transform feedback
2758 * varyings uses the "xfb_buffer", "xfb_offset", or "xfb_stride" layout
2759 * qualifiers, the values specified by TransformFeedbackVaryings are
2760 * ignored, and the set of variables captured for transform feedback is
2761 * instead derived from the specified layout qualifiers."
2763 for (int i
= MESA_SHADER_FRAGMENT
- 1; i
>= 0; i
--) {
2764 /* Find last stage before fragment shader */
2765 if (prog
->_LinkedShaders
[i
]) {
2766 has_xfb_qualifiers
=
2767 process_xfb_layout_qualifiers(mem_ctx
, prog
->_LinkedShaders
[i
],
2768 prog
, &num_tfeedback_decls
,
2774 if (!has_xfb_qualifiers
) {
2775 num_tfeedback_decls
= prog
->TransformFeedback
.NumVarying
;
2776 varying_names
= prog
->TransformFeedback
.VaryingNames
;
2779 if (num_tfeedback_decls
!= 0) {
2780 /* From GL_EXT_transform_feedback:
2781 * A program will fail to link if:
2783 * * the <count> specified by TransformFeedbackVaryingsEXT is
2784 * non-zero, but the program object has no vertex or geometry
2787 if (first
>= MESA_SHADER_FRAGMENT
) {
2788 linker_error(prog
, "Transform feedback varyings specified, but "
2789 "no vertex, tessellation, or geometry shader is "
2794 tfeedback_decls
= rzalloc_array(mem_ctx
, tfeedback_decl
,
2795 num_tfeedback_decls
);
2796 if (!parse_tfeedback_decls(ctx
, prog
, mem_ctx
, num_tfeedback_decls
,
2797 varying_names
, tfeedback_decls
))
2801 /* If there is no fragment shader we need to set transform feedback.
2803 * For SSO we also need to assign output locations. We assign them here
2804 * because we need to do it for both single stage programs and multi stage
2807 if (last
< MESA_SHADER_FRAGMENT
&&
2808 (num_tfeedback_decls
!= 0 || prog
->SeparateShader
)) {
2809 const uint64_t reserved_out_slots
=
2810 reserved_varying_slot(prog
->_LinkedShaders
[last
], ir_var_shader_out
);
2811 if (!assign_varying_locations(ctx
, mem_ctx
, prog
,
2812 prog
->_LinkedShaders
[last
], NULL
,
2813 num_tfeedback_decls
, tfeedback_decls
,
2814 reserved_out_slots
))
2818 if (last
<= MESA_SHADER_FRAGMENT
) {
2819 /* Remove unused varyings from the first/last stage unless SSO */
2820 remove_unused_shader_inputs_and_outputs(prog
->SeparateShader
,
2821 prog
->_LinkedShaders
[first
],
2823 remove_unused_shader_inputs_and_outputs(prog
->SeparateShader
,
2824 prog
->_LinkedShaders
[last
],
2827 /* If the program is made up of only a single stage */
2828 if (first
== last
) {
2829 gl_linked_shader
*const sh
= prog
->_LinkedShaders
[last
];
2831 do_dead_builtin_varyings(ctx
, NULL
, sh
, 0, NULL
);
2832 do_dead_builtin_varyings(ctx
, sh
, NULL
, num_tfeedback_decls
,
2835 if (prog
->SeparateShader
) {
2836 const uint64_t reserved_slots
=
2837 reserved_varying_slot(sh
, ir_var_shader_in
);
2839 /* Assign input locations for SSO, output locations are already
2842 if (!assign_varying_locations(ctx
, mem_ctx
, prog
,
2843 NULL
/* producer */,
2845 0 /* num_tfeedback_decls */,
2846 NULL
/* tfeedback_decls */,
2851 /* Linking the stages in the opposite order (from fragment to vertex)
2852 * ensures that inter-shader outputs written to in an earlier stage
2853 * are eliminated if they are (transitively) not used in a later
2857 for (int i
= next
- 1; i
>= 0; i
--) {
2858 if (prog
->_LinkedShaders
[i
] == NULL
&& i
!= 0)
2861 gl_linked_shader
*const sh_i
= prog
->_LinkedShaders
[i
];
2862 gl_linked_shader
*const sh_next
= prog
->_LinkedShaders
[next
];
2864 const uint64_t reserved_out_slots
=
2865 reserved_varying_slot(sh_i
, ir_var_shader_out
);
2866 const uint64_t reserved_in_slots
=
2867 reserved_varying_slot(sh_next
, ir_var_shader_in
);
2869 do_dead_builtin_varyings(ctx
, sh_i
, sh_next
,
2870 next
== MESA_SHADER_FRAGMENT
? num_tfeedback_decls
: 0,
2873 if (!assign_varying_locations(ctx
, mem_ctx
, prog
, sh_i
, sh_next
,
2874 next
== MESA_SHADER_FRAGMENT
? num_tfeedback_decls
: 0,
2876 reserved_out_slots
| reserved_in_slots
))
2879 /* This must be done after all dead varyings are eliminated. */
2881 unsigned slots_used
= _mesa_bitcount_64(reserved_out_slots
);
2882 if (!check_against_output_limit(ctx
, prog
, sh_i
, slots_used
)) {
2887 unsigned slots_used
= _mesa_bitcount_64(reserved_in_slots
);
2888 if (!check_against_input_limit(ctx
, prog
, sh_next
, slots_used
))
2896 if (!store_tfeedback_info(ctx
, prog
, num_tfeedback_decls
, tfeedback_decls
,
2897 has_xfb_qualifiers
))