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 (!prog
->IsES
&& 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
);
267 /* Check for input vars with unmatched output vars in prev stage
268 * taking into account that interface blocks could have a matching
269 * output but with different name, so we ignore them.
271 assert(!input
->data
.assigned
);
272 if (input
->data
.used
&& !input
->get_interface_type() &&
273 !input
->data
.explicit_location
&& !prog
->SeparateShader
)
275 "%s shader input `%s' "
276 "has no matching output in the previous stage\n",
277 _mesa_shader_stage_to_string(consumer
->Stage
),
286 * Initialize this object based on a string that was passed to
287 * glTransformFeedbackVaryings.
289 * If the input is mal-formed, this call still succeeds, but it sets
290 * this->var_name to a mal-formed input, so tfeedback_decl::find_output_var()
291 * will fail to find any matching variable.
294 tfeedback_decl::init(struct gl_context
*ctx
, const void *mem_ctx
,
297 /* We don't have to be pedantic about what is a valid GLSL variable name,
298 * because any variable with an invalid name can't exist in the IR anyway.
302 this->orig_name
= input
;
303 this->is_clip_distance_mesa
= false;
304 this->skip_components
= 0;
305 this->next_buffer_separator
= false;
306 this->matched_candidate
= NULL
;
309 if (ctx
->Extensions
.ARB_transform_feedback3
) {
310 /* Parse gl_NextBuffer. */
311 if (strcmp(input
, "gl_NextBuffer") == 0) {
312 this->next_buffer_separator
= true;
316 /* Parse gl_SkipComponents. */
317 if (strcmp(input
, "gl_SkipComponents1") == 0)
318 this->skip_components
= 1;
319 else if (strcmp(input
, "gl_SkipComponents2") == 0)
320 this->skip_components
= 2;
321 else if (strcmp(input
, "gl_SkipComponents3") == 0)
322 this->skip_components
= 3;
323 else if (strcmp(input
, "gl_SkipComponents4") == 0)
324 this->skip_components
= 4;
326 if (this->skip_components
)
330 /* Parse a declaration. */
331 const char *base_name_end
;
332 long subscript
= parse_program_resource_name(input
, &base_name_end
);
333 this->var_name
= ralloc_strndup(mem_ctx
, input
, base_name_end
- input
);
334 if (this->var_name
== NULL
) {
335 _mesa_error_no_memory(__func__
);
339 if (subscript
>= 0) {
340 this->array_subscript
= subscript
;
341 this->is_subscripted
= true;
343 this->is_subscripted
= false;
346 /* For drivers that lower gl_ClipDistance to gl_ClipDistanceMESA, this
347 * class must behave specially to account for the fact that gl_ClipDistance
348 * is converted from a float[8] to a vec4[2].
350 if (ctx
->Const
.ShaderCompilerOptions
[MESA_SHADER_VERTEX
].LowerClipDistance
&&
351 strcmp(this->var_name
, "gl_ClipDistance") == 0) {
352 this->is_clip_distance_mesa
= true;
358 * Determine whether two tfeedback_decl objects refer to the same variable and
359 * array index (if applicable).
362 tfeedback_decl::is_same(const tfeedback_decl
&x
, const tfeedback_decl
&y
)
364 assert(x
.is_varying() && y
.is_varying());
366 if (strcmp(x
.var_name
, y
.var_name
) != 0)
368 if (x
.is_subscripted
!= y
.is_subscripted
)
370 if (x
.is_subscripted
&& x
.array_subscript
!= y
.array_subscript
)
377 * Assign a location and stream ID for this tfeedback_decl object based on the
378 * transform feedback candidate found by find_candidate.
380 * If an error occurs, the error is reported through linker_error() and false
384 tfeedback_decl::assign_location(struct gl_context
*ctx
,
385 struct gl_shader_program
*prog
)
387 assert(this->is_varying());
389 unsigned fine_location
390 = this->matched_candidate
->toplevel_var
->data
.location
* 4
391 + this->matched_candidate
->toplevel_var
->data
.location_frac
392 + this->matched_candidate
->offset
;
394 if (this->matched_candidate
->type
->is_array()) {
396 const unsigned matrix_cols
=
397 this->matched_candidate
->type
->fields
.array
->matrix_columns
;
398 const unsigned vector_elements
=
399 this->matched_candidate
->type
->fields
.array
->vector_elements
;
400 unsigned actual_array_size
= this->is_clip_distance_mesa
?
401 prog
->LastClipDistanceArraySize
:
402 this->matched_candidate
->type
->array_size();
404 if (this->is_subscripted
) {
405 /* Check array bounds. */
406 if (this->array_subscript
>= actual_array_size
) {
407 linker_error(prog
, "Transform feedback varying %s has index "
408 "%i, but the array size is %u.",
409 this->orig_name
, this->array_subscript
,
413 unsigned array_elem_size
= this->is_clip_distance_mesa
?
414 1 : vector_elements
* matrix_cols
;
415 fine_location
+= array_elem_size
* this->array_subscript
;
418 this->size
= actual_array_size
;
420 this->vector_elements
= vector_elements
;
421 this->matrix_columns
= matrix_cols
;
422 if (this->is_clip_distance_mesa
)
423 this->type
= GL_FLOAT
;
425 this->type
= this->matched_candidate
->type
->fields
.array
->gl_type
;
427 /* Regular variable (scalar, vector, or matrix) */
428 if (this->is_subscripted
) {
429 linker_error(prog
, "Transform feedback varying %s requested, "
430 "but %s is not an array.",
431 this->orig_name
, this->var_name
);
435 this->vector_elements
= this->matched_candidate
->type
->vector_elements
;
436 this->matrix_columns
= this->matched_candidate
->type
->matrix_columns
;
437 this->type
= this->matched_candidate
->type
->gl_type
;
439 this->location
= fine_location
/ 4;
440 this->location_frac
= fine_location
% 4;
442 /* From GL_EXT_transform_feedback:
443 * A program will fail to link if:
445 * * the total number of components to capture in any varying
446 * variable in <varyings> is greater than the constant
447 * MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS_EXT and the
448 * buffer mode is SEPARATE_ATTRIBS_EXT;
450 if (prog
->TransformFeedback
.BufferMode
== GL_SEPARATE_ATTRIBS
&&
451 this->num_components() >
452 ctx
->Const
.MaxTransformFeedbackSeparateComponents
) {
453 linker_error(prog
, "Transform feedback varying %s exceeds "
454 "MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS.",
459 /* Only transform feedback varyings can be assigned to non-zero streams,
460 * so assign the stream id here.
462 this->stream_id
= this->matched_candidate
->toplevel_var
->data
.stream
;
469 tfeedback_decl::get_num_outputs() const
471 if (!this->is_varying()) {
475 return (this->num_components() + this->location_frac
+ 3)/4;
480 * Update gl_transform_feedback_info to reflect this tfeedback_decl.
482 * If an error occurs, the error is reported through linker_error() and false
486 tfeedback_decl::store(struct gl_context
*ctx
, struct gl_shader_program
*prog
,
487 struct gl_transform_feedback_info
*info
,
488 unsigned buffer
, const unsigned max_outputs
) const
490 assert(!this->next_buffer_separator
);
492 /* Handle gl_SkipComponents. */
493 if (this->skip_components
) {
494 info
->BufferStride
[buffer
] += this->skip_components
;
498 /* From GL_EXT_transform_feedback:
499 * A program will fail to link if:
501 * * the total number of components to capture is greater than
502 * the constant MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS_EXT
503 * and the buffer mode is INTERLEAVED_ATTRIBS_EXT.
505 if (prog
->TransformFeedback
.BufferMode
== GL_INTERLEAVED_ATTRIBS
&&
506 info
->BufferStride
[buffer
] + this->num_components() >
507 ctx
->Const
.MaxTransformFeedbackInterleavedComponents
) {
508 linker_error(prog
, "The MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS "
509 "limit has been exceeded.");
513 unsigned location
= this->location
;
514 unsigned location_frac
= this->location_frac
;
515 unsigned num_components
= this->num_components();
516 while (num_components
> 0) {
517 unsigned output_size
= MIN2(num_components
, 4 - location_frac
);
518 assert(info
->NumOutputs
< max_outputs
);
519 info
->Outputs
[info
->NumOutputs
].ComponentOffset
= location_frac
;
520 info
->Outputs
[info
->NumOutputs
].OutputRegister
= location
;
521 info
->Outputs
[info
->NumOutputs
].NumComponents
= output_size
;
522 info
->Outputs
[info
->NumOutputs
].StreamId
= stream_id
;
523 info
->Outputs
[info
->NumOutputs
].OutputBuffer
= buffer
;
524 info
->Outputs
[info
->NumOutputs
].DstOffset
= info
->BufferStride
[buffer
];
526 info
->BufferStride
[buffer
] += output_size
;
527 num_components
-= output_size
;
532 info
->Varyings
[info
->NumVarying
].Name
= ralloc_strdup(prog
, this->orig_name
);
533 info
->Varyings
[info
->NumVarying
].Type
= this->type
;
534 info
->Varyings
[info
->NumVarying
].Size
= this->size
;
541 const tfeedback_candidate
*
542 tfeedback_decl::find_candidate(gl_shader_program
*prog
,
543 hash_table
*tfeedback_candidates
)
545 const char *name
= this->is_clip_distance_mesa
546 ? "gl_ClipDistanceMESA" : this->var_name
;
547 this->matched_candidate
= (const tfeedback_candidate
*)
548 hash_table_find(tfeedback_candidates
, name
);
549 if (!this->matched_candidate
) {
550 /* From GL_EXT_transform_feedback:
551 * A program will fail to link if:
553 * * any variable name specified in the <varyings> array is not
554 * declared as an output in the geometry shader (if present) or
555 * the vertex shader (if no geometry shader is present);
557 linker_error(prog
, "Transform feedback varying %s undeclared.",
560 return this->matched_candidate
;
565 * Parse all the transform feedback declarations that were passed to
566 * glTransformFeedbackVaryings() and store them in tfeedback_decl objects.
568 * If an error occurs, the error is reported through linker_error() and false
572 parse_tfeedback_decls(struct gl_context
*ctx
, struct gl_shader_program
*prog
,
573 const void *mem_ctx
, unsigned num_names
,
574 char **varying_names
, tfeedback_decl
*decls
)
576 for (unsigned i
= 0; i
< num_names
; ++i
) {
577 decls
[i
].init(ctx
, mem_ctx
, varying_names
[i
]);
579 if (!decls
[i
].is_varying())
582 /* From GL_EXT_transform_feedback:
583 * A program will fail to link if:
585 * * any two entries in the <varyings> array specify the same varying
588 * We interpret this to mean "any two entries in the <varyings> array
589 * specify the same varying variable and array index", since transform
590 * feedback of arrays would be useless otherwise.
592 for (unsigned j
= 0; j
< i
; ++j
) {
593 if (!decls
[j
].is_varying())
596 if (tfeedback_decl::is_same(decls
[i
], decls
[j
])) {
597 linker_error(prog
, "Transform feedback varying %s specified "
598 "more than once.", varying_names
[i
]);
608 * Store transform feedback location assignments into
609 * prog->LinkedTransformFeedback based on the data stored in tfeedback_decls.
611 * If an error occurs, the error is reported through linker_error() and false
615 store_tfeedback_info(struct gl_context
*ctx
, struct gl_shader_program
*prog
,
616 unsigned num_tfeedback_decls
,
617 tfeedback_decl
*tfeedback_decls
)
619 bool separate_attribs_mode
=
620 prog
->TransformFeedback
.BufferMode
== GL_SEPARATE_ATTRIBS
;
622 ralloc_free(prog
->LinkedTransformFeedback
.Varyings
);
623 ralloc_free(prog
->LinkedTransformFeedback
.Outputs
);
625 memset(&prog
->LinkedTransformFeedback
, 0,
626 sizeof(prog
->LinkedTransformFeedback
));
628 prog
->LinkedTransformFeedback
.Varyings
=
630 struct gl_transform_feedback_varying_info
,
631 num_tfeedback_decls
);
633 unsigned num_outputs
= 0;
634 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
)
635 num_outputs
+= tfeedback_decls
[i
].get_num_outputs();
637 prog
->LinkedTransformFeedback
.Outputs
=
639 struct gl_transform_feedback_output
,
642 unsigned num_buffers
= 0;
644 if (separate_attribs_mode
) {
645 /* GL_SEPARATE_ATTRIBS */
646 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
647 if (!tfeedback_decls
[i
].store(ctx
, prog
, &prog
->LinkedTransformFeedback
,
648 num_buffers
, num_outputs
))
655 /* GL_INVERLEAVED_ATTRIBS */
656 int buffer_stream_id
= -1;
657 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
658 if (tfeedback_decls
[i
].is_next_buffer_separator()) {
660 buffer_stream_id
= -1;
662 } else if (buffer_stream_id
== -1) {
663 /* First varying writing to this buffer: remember its stream */
664 buffer_stream_id
= (int) tfeedback_decls
[i
].get_stream_id();
665 } else if (buffer_stream_id
!=
666 (int) tfeedback_decls
[i
].get_stream_id()) {
667 /* Varying writes to the same buffer from a different stream */
669 "Transform feedback can't capture varyings belonging "
670 "to different vertex streams in a single buffer. "
671 "Varying %s writes to buffer from stream %u, other "
672 "varyings in the same buffer write from stream %u.",
673 tfeedback_decls
[i
].name(),
674 tfeedback_decls
[i
].get_stream_id(),
679 if (!tfeedback_decls
[i
].store(ctx
, prog
,
680 &prog
->LinkedTransformFeedback
,
681 num_buffers
, num_outputs
))
687 assert(prog
->LinkedTransformFeedback
.NumOutputs
== num_outputs
);
689 prog
->LinkedTransformFeedback
.NumBuffers
= num_buffers
;
696 * Data structure recording the relationship between outputs of one shader
697 * stage (the "producer") and inputs of another (the "consumer").
699 class varying_matches
702 varying_matches(bool disable_varying_packing
, bool consumer_is_fs
);
704 void record(ir_variable
*producer_var
, ir_variable
*consumer_var
);
705 unsigned assign_locations();
706 void store_locations() const;
710 * If true, this driver disables varying packing, so all varyings need to
711 * be aligned on slot boundaries, and take up a number of slots equal to
712 * their number of matrix columns times their array size.
714 const bool disable_varying_packing
;
717 * Enum representing the order in which varyings are packed within a
720 * Currently we pack vec4's first, then vec2's, then scalar values, then
721 * vec3's. This order ensures that the only vectors that are at risk of
722 * having to be "double parked" (split between two adjacent varying slots)
725 enum packing_order_enum
{
728 PACKING_ORDER_SCALAR
,
732 static unsigned compute_packing_class(const ir_variable
*var
);
733 static packing_order_enum
compute_packing_order(const ir_variable
*var
);
734 static int match_comparator(const void *x_generic
, const void *y_generic
);
737 * Structure recording the relationship between a single producer output
738 * and a single consumer input.
742 * Packing class for this varying, computed by compute_packing_class().
744 unsigned packing_class
;
747 * Packing order for this varying, computed by compute_packing_order().
749 packing_order_enum packing_order
;
750 unsigned num_components
;
753 * The output variable in the producer stage.
755 ir_variable
*producer_var
;
758 * The input variable in the consumer stage.
760 ir_variable
*consumer_var
;
763 * The location which has been assigned for this varying. This is
764 * expressed in multiples of a float, with the first generic varying
765 * (i.e. the one referred to by VARYING_SLOT_VAR0) represented by the
768 unsigned generic_location
;
772 * The number of elements in the \c matches array that are currently in
775 unsigned num_matches
;
778 * The number of elements that were set aside for the \c matches array when
781 unsigned matches_capacity
;
783 const bool consumer_is_fs
;
786 } /* anonymous namespace */
788 varying_matches::varying_matches(bool disable_varying_packing
,
790 : disable_varying_packing(disable_varying_packing
),
791 consumer_is_fs(consumer_is_fs
)
793 /* Note: this initial capacity is rather arbitrarily chosen to be large
794 * enough for many cases without wasting an unreasonable amount of space.
795 * varying_matches::record() will resize the array if there are more than
796 * this number of varyings.
798 this->matches_capacity
= 8;
799 this->matches
= (match
*)
800 malloc(sizeof(*this->matches
) * this->matches_capacity
);
801 this->num_matches
= 0;
805 varying_matches::~varying_matches()
812 * Record the given producer/consumer variable pair in the list of variables
813 * that should later be assigned locations.
815 * It is permissible for \c consumer_var to be NULL (this happens if a
816 * variable is output by the producer and consumed by transform feedback, but
817 * not consumed by the consumer).
819 * If \c producer_var has already been paired up with a consumer_var, or
820 * producer_var is part of fixed pipeline functionality (and hence already has
821 * a location assigned), this function has no effect.
823 * Note: as a side effect this function may change the interpolation type of
824 * \c producer_var, but only when the change couldn't possibly affect
828 varying_matches::record(ir_variable
*producer_var
, ir_variable
*consumer_var
)
830 assert(producer_var
!= NULL
|| consumer_var
!= NULL
);
832 if ((producer_var
&& !producer_var
->data
.is_unmatched_generic_inout
)
833 || (consumer_var
&& !consumer_var
->data
.is_unmatched_generic_inout
)) {
834 /* Either a location already exists for this variable (since it is part
835 * of fixed functionality), or it has already been recorded as part of a
841 if ((consumer_var
== NULL
&& producer_var
->type
->contains_integer()) ||
843 /* Since this varying is not being consumed by the fragment shader, its
844 * interpolation type varying cannot possibly affect rendering. Also,
845 * this variable is non-flat and is (or contains) an integer.
847 * lower_packed_varyings requires all integer varyings to flat,
848 * regardless of where they appear. We can trivially satisfy that
849 * requirement by changing the interpolation type to flat here.
852 producer_var
->data
.centroid
= false;
853 producer_var
->data
.sample
= false;
854 producer_var
->data
.interpolation
= INTERP_QUALIFIER_FLAT
;
858 consumer_var
->data
.centroid
= false;
859 consumer_var
->data
.sample
= false;
860 consumer_var
->data
.interpolation
= INTERP_QUALIFIER_FLAT
;
864 if (this->num_matches
== this->matches_capacity
) {
865 this->matches_capacity
*= 2;
866 this->matches
= (match
*)
867 realloc(this->matches
,
868 sizeof(*this->matches
) * this->matches_capacity
);
871 const ir_variable
*const var
= (producer_var
!= NULL
)
872 ? producer_var
: consumer_var
;
874 this->matches
[this->num_matches
].packing_class
875 = this->compute_packing_class(var
);
876 this->matches
[this->num_matches
].packing_order
877 = this->compute_packing_order(var
);
878 if (this->disable_varying_packing
) {
879 unsigned slots
= var
->type
->is_array()
880 ? (var
->type
->length
* var
->type
->fields
.array
->matrix_columns
)
881 : var
->type
->matrix_columns
;
882 this->matches
[this->num_matches
].num_components
= 4 * slots
;
884 this->matches
[this->num_matches
].num_components
885 = var
->type
->component_slots();
887 this->matches
[this->num_matches
].producer_var
= producer_var
;
888 this->matches
[this->num_matches
].consumer_var
= consumer_var
;
891 producer_var
->data
.is_unmatched_generic_inout
= 0;
893 consumer_var
->data
.is_unmatched_generic_inout
= 0;
898 * Choose locations for all of the variable matches that were previously
899 * passed to varying_matches::record().
902 varying_matches::assign_locations()
904 /* Sort varying matches into an order that makes them easy to pack. */
905 qsort(this->matches
, this->num_matches
, sizeof(*this->matches
),
906 &varying_matches::match_comparator
);
908 unsigned generic_location
= 0;
910 for (unsigned i
= 0; i
< this->num_matches
; i
++) {
911 /* Advance to the next slot if this varying has a different packing
912 * class than the previous one, and we're not already on a slot
916 this->matches
[i
- 1].packing_class
917 != this->matches
[i
].packing_class
) {
918 generic_location
= ALIGN(generic_location
, 4);
921 this->matches
[i
].generic_location
= generic_location
;
923 generic_location
+= this->matches
[i
].num_components
;
926 return (generic_location
+ 3) / 4;
931 * Update the producer and consumer shaders to reflect the locations
932 * assignments that were made by varying_matches::assign_locations().
935 varying_matches::store_locations() const
937 for (unsigned i
= 0; i
< this->num_matches
; i
++) {
938 ir_variable
*producer_var
= this->matches
[i
].producer_var
;
939 ir_variable
*consumer_var
= this->matches
[i
].consumer_var
;
940 unsigned generic_location
= this->matches
[i
].generic_location
;
941 unsigned slot
= generic_location
/ 4;
942 unsigned offset
= generic_location
% 4;
945 producer_var
->data
.location
= VARYING_SLOT_VAR0
+ slot
;
946 producer_var
->data
.location_frac
= offset
;
950 assert(consumer_var
->data
.location
== -1);
951 consumer_var
->data
.location
= VARYING_SLOT_VAR0
+ slot
;
952 consumer_var
->data
.location_frac
= offset
;
959 * Compute the "packing class" of the given varying. This is an unsigned
960 * integer with the property that two variables in the same packing class can
961 * be safely backed into the same vec4.
964 varying_matches::compute_packing_class(const ir_variable
*var
)
966 /* Without help from the back-end, there is no way to pack together
967 * variables with different interpolation types, because
968 * lower_packed_varyings must choose exactly one interpolation type for
969 * each packed varying it creates.
971 * However, we can safely pack together floats, ints, and uints, because:
973 * - varyings of base type "int" and "uint" must use the "flat"
974 * interpolation type, which can only occur in GLSL 1.30 and above.
976 * - On platforms that support GLSL 1.30 and above, lower_packed_varyings
977 * can store flat floats as ints without losing any information (using
978 * the ir_unop_bitcast_* opcodes).
980 * Therefore, the packing class depends only on the interpolation type.
982 unsigned packing_class
= var
->data
.centroid
| (var
->data
.sample
<< 1);
984 packing_class
+= var
->data
.interpolation
;
985 return packing_class
;
990 * Compute the "packing order" of the given varying. This is a sort key we
991 * use to determine when to attempt to pack the given varying relative to
992 * other varyings in the same packing class.
994 varying_matches::packing_order_enum
995 varying_matches::compute_packing_order(const ir_variable
*var
)
997 const glsl_type
*element_type
= var
->type
;
999 while (element_type
->base_type
== GLSL_TYPE_ARRAY
) {
1000 element_type
= element_type
->fields
.array
;
1003 switch (element_type
->component_slots() % 4) {
1004 case 1: return PACKING_ORDER_SCALAR
;
1005 case 2: return PACKING_ORDER_VEC2
;
1006 case 3: return PACKING_ORDER_VEC3
;
1007 case 0: return PACKING_ORDER_VEC4
;
1009 assert(!"Unexpected value of vector_elements");
1010 return PACKING_ORDER_VEC4
;
1016 * Comparison function passed to qsort() to sort varyings by packing_class and
1017 * then by packing_order.
1020 varying_matches::match_comparator(const void *x_generic
, const void *y_generic
)
1022 const match
*x
= (const match
*) x_generic
;
1023 const match
*y
= (const match
*) y_generic
;
1025 if (x
->packing_class
!= y
->packing_class
)
1026 return x
->packing_class
- y
->packing_class
;
1027 return x
->packing_order
- y
->packing_order
;
1032 * Is the given variable a varying variable to be counted against the
1033 * limit in ctx->Const.MaxVarying?
1034 * This includes variables such as texcoords, colors and generic
1035 * varyings, but excludes variables such as gl_FrontFacing and gl_FragCoord.
1038 var_counts_against_varying_limit(gl_shader_stage stage
, const ir_variable
*var
)
1040 /* Only fragment shaders will take a varying variable as an input */
1041 if (stage
== MESA_SHADER_FRAGMENT
&&
1042 var
->data
.mode
== ir_var_shader_in
) {
1043 switch (var
->data
.location
) {
1044 case VARYING_SLOT_POS
:
1045 case VARYING_SLOT_FACE
:
1046 case VARYING_SLOT_PNTC
:
1057 * Visitor class that generates tfeedback_candidate structs describing all
1058 * possible targets of transform feedback.
1060 * tfeedback_candidate structs are stored in the hash table
1061 * tfeedback_candidates, which is passed to the constructor. This hash table
1062 * maps varying names to instances of the tfeedback_candidate struct.
1064 class tfeedback_candidate_generator
: public program_resource_visitor
1067 tfeedback_candidate_generator(void *mem_ctx
,
1068 hash_table
*tfeedback_candidates
)
1070 tfeedback_candidates(tfeedback_candidates
),
1076 void process(ir_variable
*var
)
1078 this->toplevel_var
= var
;
1079 this->varying_floats
= 0;
1080 if (var
->is_interface_instance())
1081 program_resource_visitor::process(var
->get_interface_type(),
1082 var
->get_interface_type()->name
);
1084 program_resource_visitor::process(var
);
1088 virtual void visit_field(const glsl_type
*type
, const char *name
,
1091 assert(!type
->without_array()->is_record());
1092 assert(!type
->without_array()->is_interface());
1096 tfeedback_candidate
*candidate
1097 = rzalloc(this->mem_ctx
, tfeedback_candidate
);
1098 candidate
->toplevel_var
= this->toplevel_var
;
1099 candidate
->type
= type
;
1100 candidate
->offset
= this->varying_floats
;
1101 hash_table_insert(this->tfeedback_candidates
, candidate
,
1102 ralloc_strdup(this->mem_ctx
, name
));
1103 this->varying_floats
+= type
->component_slots();
1107 * Memory context used to allocate hash table keys and values.
1109 void * const mem_ctx
;
1112 * Hash table in which tfeedback_candidate objects should be stored.
1114 hash_table
* const tfeedback_candidates
;
1117 * Pointer to the toplevel variable that is being traversed.
1119 ir_variable
*toplevel_var
;
1122 * Total number of varying floats that have been visited so far. This is
1123 * used to determine the offset to each varying within the toplevel
1126 unsigned varying_floats
;
1133 populate_consumer_input_sets(void *mem_ctx
, exec_list
*ir
,
1134 hash_table
*consumer_inputs
,
1135 hash_table
*consumer_interface_inputs
,
1136 ir_variable
*consumer_inputs_with_locations
[VARYING_SLOT_MAX
])
1138 memset(consumer_inputs_with_locations
,
1140 sizeof(consumer_inputs_with_locations
[0]) * VARYING_SLOT_MAX
);
1142 foreach_in_list(ir_instruction
, node
, ir
) {
1143 ir_variable
*const input_var
= node
->as_variable();
1145 if ((input_var
!= NULL
) && (input_var
->data
.mode
== ir_var_shader_in
)) {
1146 if (input_var
->type
->is_interface())
1149 if (input_var
->data
.explicit_location
) {
1150 /* assign_varying_locations only cares about finding the
1151 * ir_variable at the start of a contiguous location block.
1153 * - For !producer, consumer_inputs_with_locations isn't used.
1155 * - For !consumer, consumer_inputs_with_locations is empty.
1157 * For consumer && producer, if you were trying to set some
1158 * ir_variable to the middle of a location block on the other side
1159 * of producer/consumer, cross_validate_outputs_to_inputs() should
1160 * be link-erroring due to either type mismatch or location
1161 * overlaps. If the variables do match up, then they've got a
1162 * matching data.location and you only looked at
1163 * consumer_inputs_with_locations[var->data.location], not any
1164 * following entries for the array/structure.
1166 consumer_inputs_with_locations
[input_var
->data
.location
] =
1168 } else if (input_var
->get_interface_type() != NULL
) {
1169 char *const iface_field_name
=
1170 ralloc_asprintf(mem_ctx
, "%s.%s",
1171 input_var
->get_interface_type()->name
,
1173 hash_table_insert(consumer_interface_inputs
, input_var
,
1176 hash_table_insert(consumer_inputs
, input_var
,
1177 ralloc_strdup(mem_ctx
, input_var
->name
));
1186 * Find a variable from the consumer that "matches" the specified variable
1188 * This function only finds inputs with names that match. There is no
1189 * validation (here) that the types, etc. are compatible.
1192 get_matching_input(void *mem_ctx
,
1193 const ir_variable
*output_var
,
1194 hash_table
*consumer_inputs
,
1195 hash_table
*consumer_interface_inputs
,
1196 ir_variable
*consumer_inputs_with_locations
[VARYING_SLOT_MAX
])
1198 ir_variable
*input_var
;
1200 if (output_var
->data
.explicit_location
) {
1201 input_var
= consumer_inputs_with_locations
[output_var
->data
.location
];
1202 } else if (output_var
->get_interface_type() != NULL
) {
1203 char *const iface_field_name
=
1204 ralloc_asprintf(mem_ctx
, "%s.%s",
1205 output_var
->get_interface_type()->name
,
1208 (ir_variable
*) hash_table_find(consumer_interface_inputs
,
1212 (ir_variable
*) hash_table_find(consumer_inputs
, output_var
->name
);
1215 return (input_var
== NULL
|| input_var
->data
.mode
!= ir_var_shader_in
)
1222 io_variable_cmp(const void *_a
, const void *_b
)
1224 const ir_variable
*const a
= *(const ir_variable
**) _a
;
1225 const ir_variable
*const b
= *(const ir_variable
**) _b
;
1227 if (a
->data
.explicit_location
&& b
->data
.explicit_location
)
1228 return b
->data
.location
- a
->data
.location
;
1230 if (a
->data
.explicit_location
&& !b
->data
.explicit_location
)
1233 if (!a
->data
.explicit_location
&& b
->data
.explicit_location
)
1236 return -strcmp(a
->name
, b
->name
);
1240 * Sort the shader IO variables into canonical order
1243 canonicalize_shader_io(exec_list
*ir
, enum ir_variable_mode io_mode
)
1245 ir_variable
*var_table
[MAX_PROGRAM_OUTPUTS
* 4];
1246 unsigned num_variables
= 0;
1248 foreach_in_list(ir_instruction
, node
, ir
) {
1249 ir_variable
*const var
= node
->as_variable();
1251 if (var
== NULL
|| var
->data
.mode
!= io_mode
)
1254 /* If we have already encountered more I/O variables that could
1255 * successfully link, bail.
1257 if (num_variables
== ARRAY_SIZE(var_table
))
1260 var_table
[num_variables
++] = var
;
1263 if (num_variables
== 0)
1266 /* Sort the list in reverse order (io_variable_cmp handles this). Later
1267 * we're going to push the variables on to the IR list as a stack, so we
1268 * want the last variable (in canonical order) to be first in the list.
1270 qsort(var_table
, num_variables
, sizeof(var_table
[0]), io_variable_cmp
);
1272 /* Remove the variable from it's current location in the IR, and put it at
1275 for (unsigned i
= 0; i
< num_variables
; i
++) {
1276 var_table
[i
]->remove();
1277 ir
->push_head(var_table
[i
]);
1282 * Assign locations for all variables that are produced in one pipeline stage
1283 * (the "producer") and consumed in the next stage (the "consumer").
1285 * Variables produced by the producer may also be consumed by transform
1288 * \param num_tfeedback_decls is the number of declarations indicating
1289 * variables that may be consumed by transform feedback.
1291 * \param tfeedback_decls is a pointer to an array of tfeedback_decl objects
1292 * representing the result of parsing the strings passed to
1293 * glTransformFeedbackVaryings(). assign_location() will be called for
1294 * each of these objects that matches one of the outputs of the
1297 * \param gs_input_vertices: if \c consumer is a geometry shader, this is the
1298 * number of input vertices it accepts. Otherwise zero.
1300 * When num_tfeedback_decls is nonzero, it is permissible for the consumer to
1301 * be NULL. In this case, varying locations are assigned solely based on the
1302 * requirements of transform feedback.
1305 assign_varying_locations(struct gl_context
*ctx
,
1307 struct gl_shader_program
*prog
,
1308 gl_shader
*producer
, gl_shader
*consumer
,
1309 unsigned num_tfeedback_decls
,
1310 tfeedback_decl
*tfeedback_decls
,
1311 unsigned gs_input_vertices
)
1313 varying_matches
matches(ctx
->Const
.DisableVaryingPacking
,
1314 consumer
&& consumer
->Stage
== MESA_SHADER_FRAGMENT
);
1315 hash_table
*tfeedback_candidates
1316 = hash_table_ctor(0, hash_table_string_hash
, hash_table_string_compare
);
1317 hash_table
*consumer_inputs
1318 = hash_table_ctor(0, hash_table_string_hash
, hash_table_string_compare
);
1319 hash_table
*consumer_interface_inputs
1320 = hash_table_ctor(0, hash_table_string_hash
, hash_table_string_compare
);
1321 ir_variable
*consumer_inputs_with_locations
[VARYING_SLOT_MAX
] = {
1325 /* Operate in a total of four passes.
1327 * 1. Sort inputs / outputs into a canonical order. This is necessary so
1328 * that inputs / outputs of separable shaders will be assigned
1329 * predictable locations regardless of the order in which declarations
1330 * appeared in the shader source.
1332 * 2. Assign locations for any matching inputs and outputs.
1334 * 3. Mark output variables in the producer that do not have locations as
1335 * not being outputs. This lets the optimizer eliminate them.
1337 * 4. Mark input variables in the consumer that do not have locations as
1338 * not being inputs. This lets the optimizer eliminate them.
1341 canonicalize_shader_io(consumer
->ir
, ir_var_shader_in
);
1344 canonicalize_shader_io(producer
->ir
, ir_var_shader_out
);
1347 && !linker::populate_consumer_input_sets(mem_ctx
,
1350 consumer_interface_inputs
,
1351 consumer_inputs_with_locations
)) {
1352 assert(!"populate_consumer_input_sets failed");
1353 hash_table_dtor(tfeedback_candidates
);
1354 hash_table_dtor(consumer_inputs
);
1355 hash_table_dtor(consumer_interface_inputs
);
1360 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
1361 ir_variable
*const output_var
= node
->as_variable();
1363 if ((output_var
== NULL
) ||
1364 (output_var
->data
.mode
!= ir_var_shader_out
))
1367 /* Only geometry shaders can use non-zero streams */
1368 assert(output_var
->data
.stream
== 0 ||
1369 (output_var
->data
.stream
< MAX_VERTEX_STREAMS
&&
1370 producer
->Stage
== MESA_SHADER_GEOMETRY
));
1372 tfeedback_candidate_generator
g(mem_ctx
, tfeedback_candidates
);
1373 g
.process(output_var
);
1375 ir_variable
*const input_var
=
1376 linker::get_matching_input(mem_ctx
, output_var
, consumer_inputs
,
1377 consumer_interface_inputs
,
1378 consumer_inputs_with_locations
);
1380 /* If a matching input variable was found, add this ouptut (and the
1381 * input) to the set. If this is a separable program and there is no
1382 * consumer stage, add the output.
1384 if (input_var
|| (prog
->SeparateShader
&& consumer
== NULL
)) {
1385 matches
.record(output_var
, input_var
);
1388 /* Only stream 0 outputs can be consumed in the next stage */
1389 if (input_var
&& output_var
->data
.stream
!= 0) {
1390 linker_error(prog
, "output %s is assigned to stream=%d but "
1391 "is linked to an input, which requires stream=0",
1392 output_var
->name
, output_var
->data
.stream
);
1397 /* If there's no producer stage, then this must be a separable program.
1398 * For example, we may have a program that has just a fragment shader.
1399 * Later this program will be used with some arbitrary vertex (or
1400 * geometry) shader program. This means that locations must be assigned
1401 * for all the inputs.
1403 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
1404 ir_variable
*const input_var
= node
->as_variable();
1406 if ((input_var
== NULL
) ||
1407 (input_var
->data
.mode
!= ir_var_shader_in
))
1410 matches
.record(NULL
, input_var
);
1414 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
1415 if (!tfeedback_decls
[i
].is_varying())
1418 const tfeedback_candidate
*matched_candidate
1419 = tfeedback_decls
[i
].find_candidate(prog
, tfeedback_candidates
);
1421 if (matched_candidate
== NULL
) {
1422 hash_table_dtor(tfeedback_candidates
);
1423 hash_table_dtor(consumer_inputs
);
1424 hash_table_dtor(consumer_interface_inputs
);
1428 if (matched_candidate
->toplevel_var
->data
.is_unmatched_generic_inout
)
1429 matches
.record(matched_candidate
->toplevel_var
, NULL
);
1432 const unsigned slots_used
= matches
.assign_locations();
1433 matches
.store_locations();
1435 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
1436 if (!tfeedback_decls
[i
].is_varying())
1439 if (!tfeedback_decls
[i
].assign_location(ctx
, prog
)) {
1440 hash_table_dtor(tfeedback_candidates
);
1441 hash_table_dtor(consumer_inputs
);
1442 hash_table_dtor(consumer_interface_inputs
);
1447 hash_table_dtor(tfeedback_candidates
);
1448 hash_table_dtor(consumer_inputs
);
1449 hash_table_dtor(consumer_interface_inputs
);
1451 if (ctx
->Const
.DisableVaryingPacking
) {
1452 /* Transform feedback code assumes varyings are packed, so if the driver
1453 * has disabled varying packing, make sure it does not support transform
1456 assert(!ctx
->Extensions
.EXT_transform_feedback
);
1459 lower_packed_varyings(mem_ctx
, slots_used
, ir_var_shader_out
,
1463 lower_packed_varyings(mem_ctx
, slots_used
, ir_var_shader_in
,
1464 gs_input_vertices
, consumer
);
1468 if (consumer
&& producer
) {
1469 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
1470 ir_variable
*const var
= node
->as_variable();
1472 if (var
&& var
->data
.mode
== ir_var_shader_in
&&
1473 var
->data
.is_unmatched_generic_inout
) {
1476 * On Page 91 (Page 97 of the PDF) of the GLSL ES 1.0 spec:
1478 * If the vertex shader declares but doesn't write to a
1479 * varying and the fragment shader declares and reads it,
1484 linker_warning(prog
, "%s shader varying %s not written "
1486 _mesa_shader_stage_to_string(consumer
->Stage
),
1488 _mesa_shader_stage_to_string(producer
->Stage
));
1489 } else if (prog
->Version
<= 120) {
1490 /* On page 25 (page 31 of the PDF) of the GLSL 1.20 spec:
1492 * Only those varying variables used (i.e. read) in
1493 * the fragment shader executable must be written to
1494 * by the vertex shader executable; declaring
1495 * superfluous varying variables in a vertex shader is
1498 * We interpret this text as meaning that the VS must
1499 * write the variable for the FS to read it. See
1500 * "glsl1-varying read but not written" in piglit.
1502 linker_error(prog
, "%s shader varying %s not written "
1504 _mesa_shader_stage_to_string(consumer
->Stage
),
1506 _mesa_shader_stage_to_string(producer
->Stage
));
1509 /* An 'in' variable is only really a shader input if its
1510 * value is written by the previous stage.
1512 var
->data
.mode
= ir_var_auto
;
1521 check_against_output_limit(struct gl_context
*ctx
,
1522 struct gl_shader_program
*prog
,
1523 gl_shader
*producer
)
1525 unsigned output_vectors
= 0;
1527 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
1528 ir_variable
*const var
= node
->as_variable();
1530 if (var
&& var
->data
.mode
== ir_var_shader_out
&&
1531 var_counts_against_varying_limit(producer
->Stage
, var
)) {
1532 output_vectors
+= var
->type
->count_attribute_slots();
1536 assert(producer
->Stage
!= MESA_SHADER_FRAGMENT
);
1537 unsigned max_output_components
=
1538 ctx
->Const
.Program
[producer
->Stage
].MaxOutputComponents
;
1540 const unsigned output_components
= output_vectors
* 4;
1541 if (output_components
> max_output_components
) {
1542 if (ctx
->API
== API_OPENGLES2
|| prog
->IsES
)
1543 linker_error(prog
, "shader uses too many output vectors "
1546 max_output_components
/ 4);
1548 linker_error(prog
, "shader uses too many output components "
1551 max_output_components
);
1560 check_against_input_limit(struct gl_context
*ctx
,
1561 struct gl_shader_program
*prog
,
1562 gl_shader
*consumer
)
1564 unsigned input_vectors
= 0;
1566 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
1567 ir_variable
*const var
= node
->as_variable();
1569 if (var
&& var
->data
.mode
== ir_var_shader_in
&&
1570 var_counts_against_varying_limit(consumer
->Stage
, var
)) {
1571 input_vectors
+= var
->type
->count_attribute_slots();
1575 assert(consumer
->Stage
!= MESA_SHADER_VERTEX
);
1576 unsigned max_input_components
=
1577 ctx
->Const
.Program
[consumer
->Stage
].MaxInputComponents
;
1579 const unsigned input_components
= input_vectors
* 4;
1580 if (input_components
> max_input_components
) {
1581 if (ctx
->API
== API_OPENGLES2
|| prog
->IsES
)
1582 linker_error(prog
, "shader uses too many input vectors "
1585 max_input_components
/ 4);
1587 linker_error(prog
, "shader uses too many input components "
1590 max_input_components
);