2 * Copyright © 2012 Intel Corporation
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5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
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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
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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 "program/hash_table.h"
44 * Validate the types and qualifiers of an output from one stage against the
45 * matching input to another stage.
48 cross_validate_types_and_qualifiers(struct gl_shader_program
*prog
,
49 const ir_variable
*input
,
50 const ir_variable
*output
,
51 gl_shader_stage consumer_stage
,
52 gl_shader_stage producer_stage
)
54 /* Check that the types match between stages.
56 const glsl_type
*type_to_match
= input
->type
;
57 if (consumer_stage
== MESA_SHADER_GEOMETRY
) {
58 assert(type_to_match
->is_array()); /* Enforced by ast_to_hir */
59 type_to_match
= type_to_match
->element_type();
61 if (type_to_match
!= output
->type
) {
62 /* There is a bit of a special case for gl_TexCoord. This
63 * built-in is unsized by default. Applications that variable
64 * access it must redeclare it with a size. There is some
65 * language in the GLSL spec that implies the fragment shader
66 * and vertex shader do not have to agree on this size. Other
67 * driver behave this way, and one or two applications seem to
70 * Neither declaration needs to be modified here because the array
71 * sizes are fixed later when update_array_sizes is called.
73 * From page 48 (page 54 of the PDF) of the GLSL 1.10 spec:
75 * "Unlike user-defined varying variables, the built-in
76 * varying variables don't have a strict one-to-one
77 * correspondence between the vertex language and the
80 if (!output
->type
->is_array() || !is_gl_identifier(output
->name
)) {
82 "%s shader output `%s' declared as type `%s', "
83 "but %s shader input declared as type `%s'\n",
84 _mesa_shader_stage_to_string(producer_stage
),
87 _mesa_shader_stage_to_string(consumer_stage
),
93 /* Check that all of the qualifiers match between stages.
95 if (input
->data
.centroid
!= output
->data
.centroid
) {
97 "%s shader output `%s' %s centroid qualifier, "
98 "but %s shader input %s centroid qualifier\n",
99 _mesa_shader_stage_to_string(producer_stage
),
101 (output
->data
.centroid
) ? "has" : "lacks",
102 _mesa_shader_stage_to_string(consumer_stage
),
103 (input
->data
.centroid
) ? "has" : "lacks");
107 if (input
->data
.sample
!= output
->data
.sample
) {
109 "%s shader output `%s' %s sample qualifier, "
110 "but %s shader input %s sample qualifier\n",
111 _mesa_shader_stage_to_string(producer_stage
),
113 (output
->data
.sample
) ? "has" : "lacks",
114 _mesa_shader_stage_to_string(consumer_stage
),
115 (input
->data
.sample
) ? "has" : "lacks");
119 if (input
->data
.invariant
!= output
->data
.invariant
) {
121 "%s shader output `%s' %s invariant qualifier, "
122 "but %s shader input %s invariant qualifier\n",
123 _mesa_shader_stage_to_string(producer_stage
),
125 (output
->data
.invariant
) ? "has" : "lacks",
126 _mesa_shader_stage_to_string(consumer_stage
),
127 (input
->data
.invariant
) ? "has" : "lacks");
131 if (input
->data
.interpolation
!= output
->data
.interpolation
) {
133 "%s shader output `%s' specifies %s "
134 "interpolation qualifier, "
135 "but %s shader input specifies %s "
136 "interpolation qualifier\n",
137 _mesa_shader_stage_to_string(producer_stage
),
139 interpolation_string(output
->data
.interpolation
),
140 _mesa_shader_stage_to_string(consumer_stage
),
141 interpolation_string(input
->data
.interpolation
));
147 * Validate front and back color outputs against single color input
150 cross_validate_front_and_back_color(struct gl_shader_program
*prog
,
151 const ir_variable
*input
,
152 const ir_variable
*front_color
,
153 const ir_variable
*back_color
,
154 gl_shader_stage consumer_stage
,
155 gl_shader_stage producer_stage
)
157 if (front_color
!= NULL
&& front_color
->data
.assigned
)
158 cross_validate_types_and_qualifiers(prog
, input
, front_color
,
159 consumer_stage
, producer_stage
);
161 if (back_color
!= NULL
&& back_color
->data
.assigned
)
162 cross_validate_types_and_qualifiers(prog
, input
, back_color
,
163 consumer_stage
, producer_stage
);
167 * Validate that outputs from one stage match inputs of another
170 cross_validate_outputs_to_inputs(struct gl_shader_program
*prog
,
171 gl_shader
*producer
, gl_shader
*consumer
)
173 glsl_symbol_table parameters
;
174 ir_variable
*explicit_locations
[MAX_VARYING
] = { NULL
, };
176 /* Find all shader outputs in the "producer" stage.
178 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
179 ir_variable
*const var
= node
->as_variable();
181 if ((var
== NULL
) || (var
->data
.mode
!= ir_var_shader_out
))
184 if (!var
->data
.explicit_location
185 || var
->data
.location
< VARYING_SLOT_VAR0
)
186 parameters
.add_variable(var
);
188 /* User-defined varyings with explicit locations are handled
189 * differently because they do not need to have matching names.
191 const unsigned idx
= var
->data
.location
- VARYING_SLOT_VAR0
;
193 if (explicit_locations
[idx
] != NULL
) {
195 "%s shader has multiple outputs explicitly "
196 "assigned to location %d\n",
197 _mesa_shader_stage_to_string(producer
->Stage
),
202 explicit_locations
[idx
] = var
;
207 /* Find all shader inputs in the "consumer" stage. Any variables that have
208 * matching outputs already in the symbol table must have the same type and
211 * Exception: if the consumer is the geometry shader, then the inputs
212 * should be arrays and the type of the array element should match the type
213 * of the corresponding producer output.
215 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
216 ir_variable
*const input
= node
->as_variable();
218 if ((input
== NULL
) || (input
->data
.mode
!= ir_var_shader_in
))
221 if (strcmp(input
->name
, "gl_Color") == 0 && input
->data
.used
) {
222 const ir_variable
*const front_color
=
223 parameters
.get_variable("gl_FrontColor");
225 const ir_variable
*const back_color
=
226 parameters
.get_variable("gl_BackColor");
228 cross_validate_front_and_back_color(prog
, input
,
229 front_color
, back_color
,
230 consumer
->Stage
, producer
->Stage
);
231 } else if (strcmp(input
->name
, "gl_SecondaryColor") == 0 && input
->data
.used
) {
232 const ir_variable
*const front_color
=
233 parameters
.get_variable("gl_FrontSecondaryColor");
235 const ir_variable
*const back_color
=
236 parameters
.get_variable("gl_BackSecondaryColor");
238 cross_validate_front_and_back_color(prog
, input
,
239 front_color
, back_color
,
240 consumer
->Stage
, producer
->Stage
);
242 /* The rules for connecting inputs and outputs change in the presence
243 * of explicit locations. In this case, we no longer care about the
244 * names of the variables. Instead, we care only about the
245 * explicitly assigned location.
247 ir_variable
*output
= NULL
;
248 if (input
->data
.explicit_location
249 && input
->data
.location
>= VARYING_SLOT_VAR0
) {
250 output
= explicit_locations
[input
->data
.location
- VARYING_SLOT_VAR0
];
252 if (output
== NULL
) {
254 "%s shader input `%s' with explicit location "
255 "has no matching output\n",
256 _mesa_shader_stage_to_string(consumer
->Stage
),
260 output
= parameters
.get_variable(input
->name
);
263 if (output
!= NULL
) {
264 cross_validate_types_and_qualifiers(prog
, input
, output
,
265 consumer
->Stage
, producer
->Stage
);
273 * Initialize this object based on a string that was passed to
274 * glTransformFeedbackVaryings.
276 * If the input is mal-formed, this call still succeeds, but it sets
277 * this->var_name to a mal-formed input, so tfeedback_decl::find_output_var()
278 * will fail to find any matching variable.
281 tfeedback_decl::init(struct gl_context
*ctx
, const void *mem_ctx
,
284 /* We don't have to be pedantic about what is a valid GLSL variable name,
285 * because any variable with an invalid name can't exist in the IR anyway.
289 this->orig_name
= input
;
290 this->is_clip_distance_mesa
= false;
291 this->skip_components
= 0;
292 this->next_buffer_separator
= false;
293 this->matched_candidate
= NULL
;
296 if (ctx
->Extensions
.ARB_transform_feedback3
) {
297 /* Parse gl_NextBuffer. */
298 if (strcmp(input
, "gl_NextBuffer") == 0) {
299 this->next_buffer_separator
= true;
303 /* Parse gl_SkipComponents. */
304 if (strcmp(input
, "gl_SkipComponents1") == 0)
305 this->skip_components
= 1;
306 else if (strcmp(input
, "gl_SkipComponents2") == 0)
307 this->skip_components
= 2;
308 else if (strcmp(input
, "gl_SkipComponents3") == 0)
309 this->skip_components
= 3;
310 else if (strcmp(input
, "gl_SkipComponents4") == 0)
311 this->skip_components
= 4;
313 if (this->skip_components
)
317 /* Parse a declaration. */
318 const char *base_name_end
;
319 long subscript
= parse_program_resource_name(input
, &base_name_end
);
320 this->var_name
= ralloc_strndup(mem_ctx
, input
, base_name_end
- input
);
321 if (this->var_name
== NULL
) {
322 _mesa_error_no_memory(__func__
);
326 if (subscript
>= 0) {
327 this->array_subscript
= subscript
;
328 this->is_subscripted
= true;
330 this->is_subscripted
= false;
333 /* For drivers that lower gl_ClipDistance to gl_ClipDistanceMESA, this
334 * class must behave specially to account for the fact that gl_ClipDistance
335 * is converted from a float[8] to a vec4[2].
337 if (ctx
->Const
.ShaderCompilerOptions
[MESA_SHADER_VERTEX
].LowerClipDistance
&&
338 strcmp(this->var_name
, "gl_ClipDistance") == 0) {
339 this->is_clip_distance_mesa
= true;
345 * Determine whether two tfeedback_decl objects refer to the same variable and
346 * array index (if applicable).
349 tfeedback_decl::is_same(const tfeedback_decl
&x
, const tfeedback_decl
&y
)
351 assert(x
.is_varying() && y
.is_varying());
353 if (strcmp(x
.var_name
, y
.var_name
) != 0)
355 if (x
.is_subscripted
!= y
.is_subscripted
)
357 if (x
.is_subscripted
&& x
.array_subscript
!= y
.array_subscript
)
364 * Assign a location and stream ID for this tfeedback_decl object based on the
365 * transform feedback candidate found by find_candidate.
367 * If an error occurs, the error is reported through linker_error() and false
371 tfeedback_decl::assign_location(struct gl_context
*ctx
,
372 struct gl_shader_program
*prog
)
374 assert(this->is_varying());
376 unsigned fine_location
377 = this->matched_candidate
->toplevel_var
->data
.location
* 4
378 + this->matched_candidate
->toplevel_var
->data
.location_frac
379 + this->matched_candidate
->offset
;
381 if (this->matched_candidate
->type
->is_array()) {
383 const unsigned matrix_cols
=
384 this->matched_candidate
->type
->fields
.array
->matrix_columns
;
385 const unsigned vector_elements
=
386 this->matched_candidate
->type
->fields
.array
->vector_elements
;
387 unsigned actual_array_size
= this->is_clip_distance_mesa
?
388 prog
->LastClipDistanceArraySize
:
389 this->matched_candidate
->type
->array_size();
391 if (this->is_subscripted
) {
392 /* Check array bounds. */
393 if (this->array_subscript
>= actual_array_size
) {
394 linker_error(prog
, "Transform feedback varying %s has index "
395 "%i, but the array size is %u.",
396 this->orig_name
, this->array_subscript
,
400 unsigned array_elem_size
= this->is_clip_distance_mesa
?
401 1 : vector_elements
* matrix_cols
;
402 fine_location
+= array_elem_size
* this->array_subscript
;
405 this->size
= actual_array_size
;
407 this->vector_elements
= vector_elements
;
408 this->matrix_columns
= matrix_cols
;
409 if (this->is_clip_distance_mesa
)
410 this->type
= GL_FLOAT
;
412 this->type
= this->matched_candidate
->type
->fields
.array
->gl_type
;
414 /* Regular variable (scalar, vector, or matrix) */
415 if (this->is_subscripted
) {
416 linker_error(prog
, "Transform feedback varying %s requested, "
417 "but %s is not an array.",
418 this->orig_name
, this->var_name
);
422 this->vector_elements
= this->matched_candidate
->type
->vector_elements
;
423 this->matrix_columns
= this->matched_candidate
->type
->matrix_columns
;
424 this->type
= this->matched_candidate
->type
->gl_type
;
426 this->location
= fine_location
/ 4;
427 this->location_frac
= fine_location
% 4;
429 /* From GL_EXT_transform_feedback:
430 * A program will fail to link if:
432 * * the total number of components to capture in any varying
433 * variable in <varyings> is greater than the constant
434 * MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS_EXT and the
435 * buffer mode is SEPARATE_ATTRIBS_EXT;
437 if (prog
->TransformFeedback
.BufferMode
== GL_SEPARATE_ATTRIBS
&&
438 this->num_components() >
439 ctx
->Const
.MaxTransformFeedbackSeparateComponents
) {
440 linker_error(prog
, "Transform feedback varying %s exceeds "
441 "MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS.",
446 /* Only transform feedback varyings can be assigned to non-zero streams,
447 * so assign the stream id here.
449 this->stream_id
= this->matched_candidate
->toplevel_var
->data
.stream
;
456 tfeedback_decl::get_num_outputs() const
458 if (!this->is_varying()) {
462 return (this->num_components() + this->location_frac
+ 3)/4;
467 * Update gl_transform_feedback_info to reflect this tfeedback_decl.
469 * If an error occurs, the error is reported through linker_error() and false
473 tfeedback_decl::store(struct gl_context
*ctx
, struct gl_shader_program
*prog
,
474 struct gl_transform_feedback_info
*info
,
475 unsigned buffer
, const unsigned max_outputs
) const
477 assert(!this->next_buffer_separator
);
479 /* Handle gl_SkipComponents. */
480 if (this->skip_components
) {
481 info
->BufferStride
[buffer
] += this->skip_components
;
485 /* From GL_EXT_transform_feedback:
486 * A program will fail to link if:
488 * * the total number of components to capture is greater than
489 * the constant MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS_EXT
490 * and the buffer mode is INTERLEAVED_ATTRIBS_EXT.
492 if (prog
->TransformFeedback
.BufferMode
== GL_INTERLEAVED_ATTRIBS
&&
493 info
->BufferStride
[buffer
] + this->num_components() >
494 ctx
->Const
.MaxTransformFeedbackInterleavedComponents
) {
495 linker_error(prog
, "The MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS "
496 "limit has been exceeded.");
500 unsigned location
= this->location
;
501 unsigned location_frac
= this->location_frac
;
502 unsigned num_components
= this->num_components();
503 while (num_components
> 0) {
504 unsigned output_size
= MIN2(num_components
, 4 - location_frac
);
505 assert(info
->NumOutputs
< max_outputs
);
506 info
->Outputs
[info
->NumOutputs
].ComponentOffset
= location_frac
;
507 info
->Outputs
[info
->NumOutputs
].OutputRegister
= location
;
508 info
->Outputs
[info
->NumOutputs
].NumComponents
= output_size
;
509 info
->Outputs
[info
->NumOutputs
].StreamId
= stream_id
;
510 info
->Outputs
[info
->NumOutputs
].OutputBuffer
= buffer
;
511 info
->Outputs
[info
->NumOutputs
].DstOffset
= info
->BufferStride
[buffer
];
513 info
->BufferStride
[buffer
] += output_size
;
514 num_components
-= output_size
;
519 info
->Varyings
[info
->NumVarying
].Name
= ralloc_strdup(prog
, this->orig_name
);
520 info
->Varyings
[info
->NumVarying
].Type
= this->type
;
521 info
->Varyings
[info
->NumVarying
].Size
= this->size
;
528 const tfeedback_candidate
*
529 tfeedback_decl::find_candidate(gl_shader_program
*prog
,
530 hash_table
*tfeedback_candidates
)
532 const char *name
= this->is_clip_distance_mesa
533 ? "gl_ClipDistanceMESA" : this->var_name
;
534 this->matched_candidate
= (const tfeedback_candidate
*)
535 hash_table_find(tfeedback_candidates
, name
);
536 if (!this->matched_candidate
) {
537 /* From GL_EXT_transform_feedback:
538 * A program will fail to link if:
540 * * any variable name specified in the <varyings> array is not
541 * declared as an output in the geometry shader (if present) or
542 * the vertex shader (if no geometry shader is present);
544 linker_error(prog
, "Transform feedback varying %s undeclared.",
547 return this->matched_candidate
;
552 * Parse all the transform feedback declarations that were passed to
553 * glTransformFeedbackVaryings() and store them in tfeedback_decl objects.
555 * If an error occurs, the error is reported through linker_error() and false
559 parse_tfeedback_decls(struct gl_context
*ctx
, struct gl_shader_program
*prog
,
560 const void *mem_ctx
, unsigned num_names
,
561 char **varying_names
, tfeedback_decl
*decls
)
563 for (unsigned i
= 0; i
< num_names
; ++i
) {
564 decls
[i
].init(ctx
, mem_ctx
, varying_names
[i
]);
566 if (!decls
[i
].is_varying())
569 /* From GL_EXT_transform_feedback:
570 * A program will fail to link if:
572 * * any two entries in the <varyings> array specify the same varying
575 * We interpret this to mean "any two entries in the <varyings> array
576 * specify the same varying variable and array index", since transform
577 * feedback of arrays would be useless otherwise.
579 for (unsigned j
= 0; j
< i
; ++j
) {
580 if (!decls
[j
].is_varying())
583 if (tfeedback_decl::is_same(decls
[i
], decls
[j
])) {
584 linker_error(prog
, "Transform feedback varying %s specified "
585 "more than once.", varying_names
[i
]);
595 * Store transform feedback location assignments into
596 * prog->LinkedTransformFeedback based on the data stored in tfeedback_decls.
598 * If an error occurs, the error is reported through linker_error() and false
602 store_tfeedback_info(struct gl_context
*ctx
, struct gl_shader_program
*prog
,
603 unsigned num_tfeedback_decls
,
604 tfeedback_decl
*tfeedback_decls
)
606 bool separate_attribs_mode
=
607 prog
->TransformFeedback
.BufferMode
== GL_SEPARATE_ATTRIBS
;
609 ralloc_free(prog
->LinkedTransformFeedback
.Varyings
);
610 ralloc_free(prog
->LinkedTransformFeedback
.Outputs
);
612 memset(&prog
->LinkedTransformFeedback
, 0,
613 sizeof(prog
->LinkedTransformFeedback
));
615 prog
->LinkedTransformFeedback
.Varyings
=
617 struct gl_transform_feedback_varying_info
,
618 num_tfeedback_decls
);
620 unsigned num_outputs
= 0;
621 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
)
622 num_outputs
+= tfeedback_decls
[i
].get_num_outputs();
624 prog
->LinkedTransformFeedback
.Outputs
=
626 struct gl_transform_feedback_output
,
629 unsigned num_buffers
= 0;
631 if (separate_attribs_mode
) {
632 /* GL_SEPARATE_ATTRIBS */
633 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
634 if (!tfeedback_decls
[i
].store(ctx
, prog
, &prog
->LinkedTransformFeedback
,
635 num_buffers
, num_outputs
))
642 /* GL_INVERLEAVED_ATTRIBS */
643 int buffer_stream_id
= -1;
644 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
645 if (tfeedback_decls
[i
].is_next_buffer_separator()) {
647 buffer_stream_id
= -1;
649 } else if (buffer_stream_id
== -1) {
650 /* First varying writing to this buffer: remember its stream */
651 buffer_stream_id
= (int) tfeedback_decls
[i
].get_stream_id();
652 } else if (buffer_stream_id
!=
653 (int) tfeedback_decls
[i
].get_stream_id()) {
654 /* Varying writes to the same buffer from a different stream */
656 "Transform feedback can't capture varyings belonging "
657 "to different vertex streams in a single buffer. "
658 "Varying %s writes to buffer from stream %u, other "
659 "varyings in the same buffer write from stream %u.",
660 tfeedback_decls
[i
].name(),
661 tfeedback_decls
[i
].get_stream_id(),
666 if (!tfeedback_decls
[i
].store(ctx
, prog
,
667 &prog
->LinkedTransformFeedback
,
668 num_buffers
, num_outputs
))
674 assert(prog
->LinkedTransformFeedback
.NumOutputs
== num_outputs
);
676 prog
->LinkedTransformFeedback
.NumBuffers
= num_buffers
;
683 * Data structure recording the relationship between outputs of one shader
684 * stage (the "producer") and inputs of another (the "consumer").
686 class varying_matches
689 varying_matches(bool disable_varying_packing
, bool consumer_is_fs
);
691 void record(ir_variable
*producer_var
, ir_variable
*consumer_var
);
692 unsigned assign_locations();
693 void store_locations() const;
697 * If true, this driver disables varying packing, so all varyings need to
698 * be aligned on slot boundaries, and take up a number of slots equal to
699 * their number of matrix columns times their array size.
701 const bool disable_varying_packing
;
704 * Enum representing the order in which varyings are packed within a
707 * Currently we pack vec4's first, then vec2's, then scalar values, then
708 * vec3's. This order ensures that the only vectors that are at risk of
709 * having to be "double parked" (split between two adjacent varying slots)
712 enum packing_order_enum
{
715 PACKING_ORDER_SCALAR
,
719 static unsigned compute_packing_class(const ir_variable
*var
);
720 static packing_order_enum
compute_packing_order(const ir_variable
*var
);
721 static int match_comparator(const void *x_generic
, const void *y_generic
);
724 * Structure recording the relationship between a single producer output
725 * and a single consumer input.
729 * Packing class for this varying, computed by compute_packing_class().
731 unsigned packing_class
;
734 * Packing order for this varying, computed by compute_packing_order().
736 packing_order_enum packing_order
;
737 unsigned num_components
;
740 * The output variable in the producer stage.
742 ir_variable
*producer_var
;
745 * The input variable in the consumer stage.
747 ir_variable
*consumer_var
;
750 * The location which has been assigned for this varying. This is
751 * expressed in multiples of a float, with the first generic varying
752 * (i.e. the one referred to by VARYING_SLOT_VAR0) represented by the
755 unsigned generic_location
;
759 * The number of elements in the \c matches array that are currently in
762 unsigned num_matches
;
765 * The number of elements that were set aside for the \c matches array when
768 unsigned matches_capacity
;
770 const bool consumer_is_fs
;
773 } /* anonymous namespace */
775 varying_matches::varying_matches(bool disable_varying_packing
,
777 : disable_varying_packing(disable_varying_packing
),
778 consumer_is_fs(consumer_is_fs
)
780 /* Note: this initial capacity is rather arbitrarily chosen to be large
781 * enough for many cases without wasting an unreasonable amount of space.
782 * varying_matches::record() will resize the array if there are more than
783 * this number of varyings.
785 this->matches_capacity
= 8;
786 this->matches
= (match
*)
787 malloc(sizeof(*this->matches
) * this->matches_capacity
);
788 this->num_matches
= 0;
792 varying_matches::~varying_matches()
799 * Record the given producer/consumer variable pair in the list of variables
800 * that should later be assigned locations.
802 * It is permissible for \c consumer_var to be NULL (this happens if a
803 * variable is output by the producer and consumed by transform feedback, but
804 * not consumed by the consumer).
806 * If \c producer_var has already been paired up with a consumer_var, or
807 * producer_var is part of fixed pipeline functionality (and hence already has
808 * a location assigned), this function has no effect.
810 * Note: as a side effect this function may change the interpolation type of
811 * \c producer_var, but only when the change couldn't possibly affect
815 varying_matches::record(ir_variable
*producer_var
, ir_variable
*consumer_var
)
817 assert(producer_var
!= NULL
|| consumer_var
!= NULL
);
819 if ((producer_var
&& !producer_var
->data
.is_unmatched_generic_inout
)
820 || (consumer_var
&& !consumer_var
->data
.is_unmatched_generic_inout
)) {
821 /* Either a location already exists for this variable (since it is part
822 * of fixed functionality), or it has already been recorded as part of a
828 if ((consumer_var
== NULL
&& producer_var
->type
->contains_integer()) ||
830 /* Since this varying is not being consumed by the fragment shader, its
831 * interpolation type varying cannot possibly affect rendering. Also,
832 * this variable is non-flat and is (or contains) an integer.
834 * lower_packed_varyings requires all integer varyings to flat,
835 * regardless of where they appear. We can trivially satisfy that
836 * requirement by changing the interpolation type to flat here.
839 producer_var
->data
.centroid
= false;
840 producer_var
->data
.sample
= false;
841 producer_var
->data
.interpolation
= INTERP_QUALIFIER_FLAT
;
845 consumer_var
->data
.centroid
= false;
846 consumer_var
->data
.sample
= false;
847 consumer_var
->data
.interpolation
= INTERP_QUALIFIER_FLAT
;
851 if (this->num_matches
== this->matches_capacity
) {
852 this->matches_capacity
*= 2;
853 this->matches
= (match
*)
854 realloc(this->matches
,
855 sizeof(*this->matches
) * this->matches_capacity
);
858 const ir_variable
*const var
= (producer_var
!= NULL
)
859 ? producer_var
: consumer_var
;
861 this->matches
[this->num_matches
].packing_class
862 = this->compute_packing_class(var
);
863 this->matches
[this->num_matches
].packing_order
864 = this->compute_packing_order(var
);
865 if (this->disable_varying_packing
) {
866 unsigned slots
= var
->type
->is_array()
867 ? (var
->type
->length
* var
->type
->fields
.array
->matrix_columns
)
868 : var
->type
->matrix_columns
;
869 this->matches
[this->num_matches
].num_components
= 4 * slots
;
871 this->matches
[this->num_matches
].num_components
872 = var
->type
->component_slots();
874 this->matches
[this->num_matches
].producer_var
= producer_var
;
875 this->matches
[this->num_matches
].consumer_var
= consumer_var
;
878 producer_var
->data
.is_unmatched_generic_inout
= 0;
880 consumer_var
->data
.is_unmatched_generic_inout
= 0;
885 * Choose locations for all of the variable matches that were previously
886 * passed to varying_matches::record().
889 varying_matches::assign_locations()
891 /* Sort varying matches into an order that makes them easy to pack. */
892 qsort(this->matches
, this->num_matches
, sizeof(*this->matches
),
893 &varying_matches::match_comparator
);
895 unsigned generic_location
= 0;
897 for (unsigned i
= 0; i
< this->num_matches
; i
++) {
898 /* Advance to the next slot if this varying has a different packing
899 * class than the previous one, and we're not already on a slot
903 this->matches
[i
- 1].packing_class
904 != this->matches
[i
].packing_class
) {
905 generic_location
= ALIGN(generic_location
, 4);
908 this->matches
[i
].generic_location
= generic_location
;
910 generic_location
+= this->matches
[i
].num_components
;
913 return (generic_location
+ 3) / 4;
918 * Update the producer and consumer shaders to reflect the locations
919 * assignments that were made by varying_matches::assign_locations().
922 varying_matches::store_locations() const
924 for (unsigned i
= 0; i
< this->num_matches
; i
++) {
925 ir_variable
*producer_var
= this->matches
[i
].producer_var
;
926 ir_variable
*consumer_var
= this->matches
[i
].consumer_var
;
927 unsigned generic_location
= this->matches
[i
].generic_location
;
928 unsigned slot
= generic_location
/ 4;
929 unsigned offset
= generic_location
% 4;
932 producer_var
->data
.location
= VARYING_SLOT_VAR0
+ slot
;
933 producer_var
->data
.location_frac
= offset
;
937 assert(consumer_var
->data
.location
== -1);
938 consumer_var
->data
.location
= VARYING_SLOT_VAR0
+ slot
;
939 consumer_var
->data
.location_frac
= offset
;
946 * Compute the "packing class" of the given varying. This is an unsigned
947 * integer with the property that two variables in the same packing class can
948 * be safely backed into the same vec4.
951 varying_matches::compute_packing_class(const ir_variable
*var
)
953 /* Without help from the back-end, there is no way to pack together
954 * variables with different interpolation types, because
955 * lower_packed_varyings must choose exactly one interpolation type for
956 * each packed varying it creates.
958 * However, we can safely pack together floats, ints, and uints, because:
960 * - varyings of base type "int" and "uint" must use the "flat"
961 * interpolation type, which can only occur in GLSL 1.30 and above.
963 * - On platforms that support GLSL 1.30 and above, lower_packed_varyings
964 * can store flat floats as ints without losing any information (using
965 * the ir_unop_bitcast_* opcodes).
967 * Therefore, the packing class depends only on the interpolation type.
969 unsigned packing_class
= var
->data
.centroid
| (var
->data
.sample
<< 1);
971 packing_class
+= var
->data
.interpolation
;
972 return packing_class
;
977 * Compute the "packing order" of the given varying. This is a sort key we
978 * use to determine when to attempt to pack the given varying relative to
979 * other varyings in the same packing class.
981 varying_matches::packing_order_enum
982 varying_matches::compute_packing_order(const ir_variable
*var
)
984 const glsl_type
*element_type
= var
->type
;
986 while (element_type
->base_type
== GLSL_TYPE_ARRAY
) {
987 element_type
= element_type
->fields
.array
;
990 switch (element_type
->component_slots() % 4) {
991 case 1: return PACKING_ORDER_SCALAR
;
992 case 2: return PACKING_ORDER_VEC2
;
993 case 3: return PACKING_ORDER_VEC3
;
994 case 0: return PACKING_ORDER_VEC4
;
996 assert(!"Unexpected value of vector_elements");
997 return PACKING_ORDER_VEC4
;
1003 * Comparison function passed to qsort() to sort varyings by packing_class and
1004 * then by packing_order.
1007 varying_matches::match_comparator(const void *x_generic
, const void *y_generic
)
1009 const match
*x
= (const match
*) x_generic
;
1010 const match
*y
= (const match
*) y_generic
;
1012 if (x
->packing_class
!= y
->packing_class
)
1013 return x
->packing_class
- y
->packing_class
;
1014 return x
->packing_order
- y
->packing_order
;
1019 * Is the given variable a varying variable to be counted against the
1020 * limit in ctx->Const.MaxVarying?
1021 * This includes variables such as texcoords, colors and generic
1022 * varyings, but excludes variables such as gl_FrontFacing and gl_FragCoord.
1025 var_counts_against_varying_limit(gl_shader_stage stage
, const ir_variable
*var
)
1027 /* Only fragment shaders will take a varying variable as an input */
1028 if (stage
== MESA_SHADER_FRAGMENT
&&
1029 var
->data
.mode
== ir_var_shader_in
) {
1030 switch (var
->data
.location
) {
1031 case VARYING_SLOT_POS
:
1032 case VARYING_SLOT_FACE
:
1033 case VARYING_SLOT_PNTC
:
1044 * Visitor class that generates tfeedback_candidate structs describing all
1045 * possible targets of transform feedback.
1047 * tfeedback_candidate structs are stored in the hash table
1048 * tfeedback_candidates, which is passed to the constructor. This hash table
1049 * maps varying names to instances of the tfeedback_candidate struct.
1051 class tfeedback_candidate_generator
: public program_resource_visitor
1054 tfeedback_candidate_generator(void *mem_ctx
,
1055 hash_table
*tfeedback_candidates
)
1057 tfeedback_candidates(tfeedback_candidates
),
1063 void process(ir_variable
*var
)
1065 this->toplevel_var
= var
;
1066 this->varying_floats
= 0;
1067 if (var
->is_interface_instance())
1068 program_resource_visitor::process(var
->get_interface_type(),
1069 var
->get_interface_type()->name
);
1071 program_resource_visitor::process(var
);
1075 virtual void visit_field(const glsl_type
*type
, const char *name
,
1078 assert(!type
->without_array()->is_record());
1079 assert(!type
->without_array()->is_interface());
1083 tfeedback_candidate
*candidate
1084 = rzalloc(this->mem_ctx
, tfeedback_candidate
);
1085 candidate
->toplevel_var
= this->toplevel_var
;
1086 candidate
->type
= type
;
1087 candidate
->offset
= this->varying_floats
;
1088 hash_table_insert(this->tfeedback_candidates
, candidate
,
1089 ralloc_strdup(this->mem_ctx
, name
));
1090 this->varying_floats
+= type
->component_slots();
1094 * Memory context used to allocate hash table keys and values.
1096 void * const mem_ctx
;
1099 * Hash table in which tfeedback_candidate objects should be stored.
1101 hash_table
* const tfeedback_candidates
;
1104 * Pointer to the toplevel variable that is being traversed.
1106 ir_variable
*toplevel_var
;
1109 * Total number of varying floats that have been visited so far. This is
1110 * used to determine the offset to each varying within the toplevel
1113 unsigned varying_floats
;
1120 populate_consumer_input_sets(void *mem_ctx
, exec_list
*ir
,
1121 hash_table
*consumer_inputs
,
1122 hash_table
*consumer_interface_inputs
,
1123 ir_variable
*consumer_inputs_with_locations
[VARYING_SLOT_MAX
])
1125 memset(consumer_inputs_with_locations
,
1127 sizeof(consumer_inputs_with_locations
[0]) * VARYING_SLOT_MAX
);
1129 foreach_in_list(ir_instruction
, node
, ir
) {
1130 ir_variable
*const input_var
= node
->as_variable();
1132 if ((input_var
!= NULL
) && (input_var
->data
.mode
== ir_var_shader_in
)) {
1133 if (input_var
->type
->is_interface())
1136 if (input_var
->data
.explicit_location
) {
1137 /* assign_varying_locations only cares about finding the
1138 * ir_variable at the start of a contiguous location block.
1140 * - For !producer, consumer_inputs_with_locations isn't used.
1142 * - For !consumer, consumer_inputs_with_locations is empty.
1144 * For consumer && producer, if you were trying to set some
1145 * ir_variable to the middle of a location block on the other side
1146 * of producer/consumer, cross_validate_outputs_to_inputs() should
1147 * be link-erroring due to either type mismatch or location
1148 * overlaps. If the variables do match up, then they've got a
1149 * matching data.location and you only looked at
1150 * consumer_inputs_with_locations[var->data.location], not any
1151 * following entries for the array/structure.
1153 consumer_inputs_with_locations
[input_var
->data
.location
] =
1155 } else if (input_var
->get_interface_type() != NULL
) {
1156 char *const iface_field_name
=
1157 ralloc_asprintf(mem_ctx
, "%s.%s",
1158 input_var
->get_interface_type()->name
,
1160 hash_table_insert(consumer_interface_inputs
, input_var
,
1163 hash_table_insert(consumer_inputs
, input_var
,
1164 ralloc_strdup(mem_ctx
, input_var
->name
));
1173 * Find a variable from the consumer that "matches" the specified variable
1175 * This function only finds inputs with names that match. There is no
1176 * validation (here) that the types, etc. are compatible.
1179 get_matching_input(void *mem_ctx
,
1180 const ir_variable
*output_var
,
1181 hash_table
*consumer_inputs
,
1182 hash_table
*consumer_interface_inputs
,
1183 ir_variable
*consumer_inputs_with_locations
[VARYING_SLOT_MAX
])
1185 ir_variable
*input_var
;
1187 if (output_var
->data
.explicit_location
) {
1188 input_var
= consumer_inputs_with_locations
[output_var
->data
.location
];
1189 } else if (output_var
->get_interface_type() != NULL
) {
1190 char *const iface_field_name
=
1191 ralloc_asprintf(mem_ctx
, "%s.%s",
1192 output_var
->get_interface_type()->name
,
1195 (ir_variable
*) hash_table_find(consumer_interface_inputs
,
1199 (ir_variable
*) hash_table_find(consumer_inputs
, output_var
->name
);
1202 return (input_var
== NULL
|| input_var
->data
.mode
!= ir_var_shader_in
)
1209 io_variable_cmp(const void *_a
, const void *_b
)
1211 const ir_variable
*const a
= *(const ir_variable
**) _a
;
1212 const ir_variable
*const b
= *(const ir_variable
**) _b
;
1214 if (a
->data
.explicit_location
&& b
->data
.explicit_location
)
1215 return b
->data
.location
- a
->data
.location
;
1217 if (a
->data
.explicit_location
&& !b
->data
.explicit_location
)
1220 if (!a
->data
.explicit_location
&& b
->data
.explicit_location
)
1223 return -strcmp(a
->name
, b
->name
);
1227 * Sort the shader IO variables into canonical order
1230 canonicalize_shader_io(exec_list
*ir
, enum ir_variable_mode io_mode
)
1232 ir_variable
*var_table
[MAX_PROGRAM_OUTPUTS
* 4];
1233 unsigned num_variables
= 0;
1235 foreach_in_list(ir_instruction
, node
, ir
) {
1236 ir_variable
*const var
= node
->as_variable();
1238 if (var
== NULL
|| var
->data
.mode
!= io_mode
)
1241 /* If we have already encountered more I/O variables that could
1242 * successfully link, bail.
1244 if (num_variables
== ARRAY_SIZE(var_table
))
1247 var_table
[num_variables
++] = var
;
1250 if (num_variables
== 0)
1253 /* Sort the list in reverse order (io_variable_cmp handles this). Later
1254 * we're going to push the variables on to the IR list as a stack, so we
1255 * want the last variable (in canonical order) to be first in the list.
1257 qsort(var_table
, num_variables
, sizeof(var_table
[0]), io_variable_cmp
);
1259 /* Remove the variable from it's current location in the IR, and put it at
1262 for (unsigned i
= 0; i
< num_variables
; i
++) {
1263 var_table
[i
]->remove();
1264 ir
->push_head(var_table
[i
]);
1269 * Assign locations for all variables that are produced in one pipeline stage
1270 * (the "producer") and consumed in the next stage (the "consumer").
1272 * Variables produced by the producer may also be consumed by transform
1275 * \param num_tfeedback_decls is the number of declarations indicating
1276 * variables that may be consumed by transform feedback.
1278 * \param tfeedback_decls is a pointer to an array of tfeedback_decl objects
1279 * representing the result of parsing the strings passed to
1280 * glTransformFeedbackVaryings(). assign_location() will be called for
1281 * each of these objects that matches one of the outputs of the
1284 * \param gs_input_vertices: if \c consumer is a geometry shader, this is the
1285 * number of input vertices it accepts. Otherwise zero.
1287 * When num_tfeedback_decls is nonzero, it is permissible for the consumer to
1288 * be NULL. In this case, varying locations are assigned solely based on the
1289 * requirements of transform feedback.
1292 assign_varying_locations(struct gl_context
*ctx
,
1294 struct gl_shader_program
*prog
,
1295 gl_shader
*producer
, gl_shader
*consumer
,
1296 unsigned num_tfeedback_decls
,
1297 tfeedback_decl
*tfeedback_decls
,
1298 unsigned gs_input_vertices
)
1300 varying_matches
matches(ctx
->Const
.DisableVaryingPacking
,
1301 consumer
&& consumer
->Stage
== MESA_SHADER_FRAGMENT
);
1302 hash_table
*tfeedback_candidates
1303 = hash_table_ctor(0, hash_table_string_hash
, hash_table_string_compare
);
1304 hash_table
*consumer_inputs
1305 = hash_table_ctor(0, hash_table_string_hash
, hash_table_string_compare
);
1306 hash_table
*consumer_interface_inputs
1307 = hash_table_ctor(0, hash_table_string_hash
, hash_table_string_compare
);
1308 ir_variable
*consumer_inputs_with_locations
[VARYING_SLOT_MAX
] = {
1312 /* Operate in a total of four passes.
1314 * 1. Sort inputs / outputs into a canonical order. This is necessary so
1315 * that inputs / outputs of separable shaders will be assigned
1316 * predictable locations regardless of the order in which declarations
1317 * appeared in the shader source.
1319 * 2. Assign locations for any matching inputs and outputs.
1321 * 3. Mark output variables in the producer that do not have locations as
1322 * not being outputs. This lets the optimizer eliminate them.
1324 * 4. Mark input variables in the consumer that do not have locations as
1325 * not being inputs. This lets the optimizer eliminate them.
1328 canonicalize_shader_io(consumer
->ir
, ir_var_shader_in
);
1331 canonicalize_shader_io(producer
->ir
, ir_var_shader_out
);
1334 && !linker::populate_consumer_input_sets(mem_ctx
,
1337 consumer_interface_inputs
,
1338 consumer_inputs_with_locations
)) {
1339 assert(!"populate_consumer_input_sets failed");
1340 hash_table_dtor(tfeedback_candidates
);
1341 hash_table_dtor(consumer_inputs
);
1342 hash_table_dtor(consumer_interface_inputs
);
1347 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
1348 ir_variable
*const output_var
= node
->as_variable();
1350 if ((output_var
== NULL
) ||
1351 (output_var
->data
.mode
!= ir_var_shader_out
))
1354 /* Only geometry shaders can use non-zero streams */
1355 assert(output_var
->data
.stream
== 0 ||
1356 (output_var
->data
.stream
< MAX_VERTEX_STREAMS
&&
1357 producer
->Stage
== MESA_SHADER_GEOMETRY
));
1359 tfeedback_candidate_generator
g(mem_ctx
, tfeedback_candidates
);
1360 g
.process(output_var
);
1362 ir_variable
*const input_var
=
1363 linker::get_matching_input(mem_ctx
, output_var
, consumer_inputs
,
1364 consumer_interface_inputs
,
1365 consumer_inputs_with_locations
);
1367 /* If a matching input variable was found, add this ouptut (and the
1368 * input) to the set. If this is a separable program and there is no
1369 * consumer stage, add the output.
1371 if (input_var
|| (prog
->SeparateShader
&& consumer
== NULL
)) {
1372 matches
.record(output_var
, input_var
);
1375 /* Only stream 0 outputs can be consumed in the next stage */
1376 if (input_var
&& output_var
->data
.stream
!= 0) {
1377 linker_error(prog
, "output %s is assigned to stream=%d but "
1378 "is linked to an input, which requires stream=0",
1379 output_var
->name
, output_var
->data
.stream
);
1384 /* If there's no producer stage, then this must be a separable program.
1385 * For example, we may have a program that has just a fragment shader.
1386 * Later this program will be used with some arbitrary vertex (or
1387 * geometry) shader program. This means that locations must be assigned
1388 * for all the inputs.
1390 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
1391 ir_variable
*const input_var
= node
->as_variable();
1393 if ((input_var
== NULL
) ||
1394 (input_var
->data
.mode
!= ir_var_shader_in
))
1397 matches
.record(NULL
, input_var
);
1401 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
1402 if (!tfeedback_decls
[i
].is_varying())
1405 const tfeedback_candidate
*matched_candidate
1406 = tfeedback_decls
[i
].find_candidate(prog
, tfeedback_candidates
);
1408 if (matched_candidate
== NULL
) {
1409 hash_table_dtor(tfeedback_candidates
);
1410 hash_table_dtor(consumer_inputs
);
1411 hash_table_dtor(consumer_interface_inputs
);
1415 if (matched_candidate
->toplevel_var
->data
.is_unmatched_generic_inout
)
1416 matches
.record(matched_candidate
->toplevel_var
, NULL
);
1419 const unsigned slots_used
= matches
.assign_locations();
1420 matches
.store_locations();
1422 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
1423 if (!tfeedback_decls
[i
].is_varying())
1426 if (!tfeedback_decls
[i
].assign_location(ctx
, prog
)) {
1427 hash_table_dtor(tfeedback_candidates
);
1428 hash_table_dtor(consumer_inputs
);
1429 hash_table_dtor(consumer_interface_inputs
);
1434 hash_table_dtor(tfeedback_candidates
);
1435 hash_table_dtor(consumer_inputs
);
1436 hash_table_dtor(consumer_interface_inputs
);
1438 if (ctx
->Const
.DisableVaryingPacking
) {
1439 /* Transform feedback code assumes varyings are packed, so if the driver
1440 * has disabled varying packing, make sure it does not support transform
1443 assert(!ctx
->Extensions
.EXT_transform_feedback
);
1446 lower_packed_varyings(mem_ctx
, slots_used
, ir_var_shader_out
,
1450 lower_packed_varyings(mem_ctx
, slots_used
, ir_var_shader_in
,
1451 gs_input_vertices
, consumer
);
1455 if (consumer
&& producer
) {
1456 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
1457 ir_variable
*const var
= node
->as_variable();
1459 if (var
&& var
->data
.mode
== ir_var_shader_in
&&
1460 var
->data
.is_unmatched_generic_inout
) {
1463 * On Page 91 (Page 97 of the PDF) of the GLSL ES 1.0 spec:
1465 * If the vertex shader declares but doesn't write to a
1466 * varying and the fragment shader declares and reads it,
1471 linker_warning(prog
, "%s shader varying %s not written "
1473 _mesa_shader_stage_to_string(consumer
->Stage
),
1475 _mesa_shader_stage_to_string(producer
->Stage
));
1476 } else if (prog
->Version
<= 120) {
1477 /* On page 25 (page 31 of the PDF) of the GLSL 1.20 spec:
1479 * Only those varying variables used (i.e. read) in
1480 * the fragment shader executable must be written to
1481 * by the vertex shader executable; declaring
1482 * superfluous varying variables in a vertex shader is
1485 * We interpret this text as meaning that the VS must
1486 * write the variable for the FS to read it. See
1487 * "glsl1-varying read but not written" in piglit.
1489 linker_error(prog
, "%s shader varying %s not written "
1491 _mesa_shader_stage_to_string(consumer
->Stage
),
1493 _mesa_shader_stage_to_string(producer
->Stage
));
1496 /* An 'in' variable is only really a shader input if its
1497 * value is written by the previous stage.
1499 var
->data
.mode
= ir_var_auto
;
1508 check_against_output_limit(struct gl_context
*ctx
,
1509 struct gl_shader_program
*prog
,
1510 gl_shader
*producer
)
1512 unsigned output_vectors
= 0;
1514 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
1515 ir_variable
*const var
= node
->as_variable();
1517 if (var
&& var
->data
.mode
== ir_var_shader_out
&&
1518 var_counts_against_varying_limit(producer
->Stage
, var
)) {
1519 output_vectors
+= var
->type
->count_attribute_slots();
1523 assert(producer
->Stage
!= MESA_SHADER_FRAGMENT
);
1524 unsigned max_output_components
=
1525 ctx
->Const
.Program
[producer
->Stage
].MaxOutputComponents
;
1527 const unsigned output_components
= output_vectors
* 4;
1528 if (output_components
> max_output_components
) {
1529 if (ctx
->API
== API_OPENGLES2
|| prog
->IsES
)
1530 linker_error(prog
, "shader uses too many output vectors "
1533 max_output_components
/ 4);
1535 linker_error(prog
, "shader uses too many output components "
1538 max_output_components
);
1547 check_against_input_limit(struct gl_context
*ctx
,
1548 struct gl_shader_program
*prog
,
1549 gl_shader
*consumer
)
1551 unsigned input_vectors
= 0;
1553 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
1554 ir_variable
*const var
= node
->as_variable();
1556 if (var
&& var
->data
.mode
== ir_var_shader_in
&&
1557 var_counts_against_varying_limit(consumer
->Stage
, var
)) {
1558 input_vectors
+= var
->type
->count_attribute_slots();
1562 assert(consumer
->Stage
!= MESA_SHADER_VERTEX
);
1563 unsigned max_input_components
=
1564 ctx
->Const
.Program
[consumer
->Stage
].MaxInputComponents
;
1566 const unsigned input_components
= input_vectors
* 4;
1567 if (input_components
> max_input_components
) {
1568 if (ctx
->API
== API_OPENGLES2
|| prog
->IsES
)
1569 linker_error(prog
, "shader uses too many input vectors "
1572 max_input_components
/ 4);
1574 linker_error(prog
, "shader uses too many input components "
1577 max_input_components
);