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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 * Get the varying type stripped of the outermost array if we're processing
45 * a stage whose varyings are arrays indexed by a vertex number (such as
46 * geometry shader inputs).
48 static const glsl_type
*
49 get_varying_type(const ir_variable
*var
, gl_shader_stage stage
)
51 const glsl_type
*type
= var
->type
;
53 if (!var
->data
.patch
&&
54 ((var
->data
.mode
== ir_var_shader_out
&&
55 stage
== MESA_SHADER_TESS_CTRL
) ||
56 (var
->data
.mode
== ir_var_shader_in
&&
57 (stage
== MESA_SHADER_TESS_CTRL
|| stage
== MESA_SHADER_TESS_EVAL
||
58 stage
== MESA_SHADER_GEOMETRY
)))) {
59 assert(type
->is_array());
60 type
= type
->fields
.array
;
67 create_xfb_varying_names(void *mem_ctx
, const glsl_type
*t
, char **name
,
68 size_t name_length
, unsigned *count
,
69 const char *ifc_member_name
,
70 const glsl_type
*ifc_member_t
, char ***varying_names
)
72 if (t
->is_interface()) {
73 size_t new_length
= name_length
;
75 assert(ifc_member_name
&& ifc_member_t
);
76 ralloc_asprintf_rewrite_tail(name
, &new_length
, ".%s", ifc_member_name
);
78 create_xfb_varying_names(mem_ctx
, ifc_member_t
, name
, new_length
, count
,
79 NULL
, NULL
, varying_names
);
80 } else if (t
->is_record()) {
81 for (unsigned i
= 0; i
< t
->length
; i
++) {
82 const char *field
= t
->fields
.structure
[i
].name
;
83 size_t new_length
= name_length
;
85 ralloc_asprintf_rewrite_tail(name
, &new_length
, ".%s", field
);
87 create_xfb_varying_names(mem_ctx
, t
->fields
.structure
[i
].type
, name
,
88 new_length
, count
, NULL
, NULL
,
91 } else if (t
->without_array()->is_record() ||
92 t
->without_array()->is_interface() ||
93 (t
->is_array() && t
->fields
.array
->is_array())) {
94 for (unsigned i
= 0; i
< t
->length
; i
++) {
95 size_t new_length
= name_length
;
97 /* Append the subscript to the current variable name */
98 ralloc_asprintf_rewrite_tail(name
, &new_length
, "[%u]", i
);
100 create_xfb_varying_names(mem_ctx
, t
->fields
.array
, name
, new_length
,
101 count
, ifc_member_name
, ifc_member_t
,
105 (*varying_names
)[(*count
)++] = ralloc_strdup(mem_ctx
, *name
);
110 process_xfb_layout_qualifiers(void *mem_ctx
, const gl_shader
*sh
,
111 unsigned *num_tfeedback_decls
,
112 char ***varying_names
)
114 bool has_xfb_qualifiers
= false;
116 foreach_in_list(ir_instruction
, node
, sh
->ir
) {
117 ir_variable
*var
= node
->as_variable();
118 if (!var
|| var
->data
.mode
!= ir_var_shader_out
)
121 /* From the ARB_enhanced_layouts spec:
123 * "Any shader making any static use (after preprocessing) of any of
124 * these *xfb_* qualifiers will cause the shader to be in a
125 * transform feedback capturing mode and hence responsible for
126 * describing the transform feedback setup. This mode will capture
127 * any output selected by *xfb_offset*, directly or indirectly, to
128 * a transform feedback buffer."
130 if (var
->data
.explicit_xfb_buffer
|| var
->data
.explicit_xfb_stride
) {
131 has_xfb_qualifiers
= true;
134 if (var
->data
.explicit_xfb_offset
) {
135 *num_tfeedback_decls
+= var
->type
->varying_count();
136 has_xfb_qualifiers
= true;
140 if (*num_tfeedback_decls
== 0)
141 return has_xfb_qualifiers
;
144 *varying_names
= ralloc_array(mem_ctx
, char *, *num_tfeedback_decls
);
145 foreach_in_list(ir_instruction
, node
, sh
->ir
) {
146 ir_variable
*var
= node
->as_variable();
147 if (!var
|| var
->data
.mode
!= ir_var_shader_out
)
150 if (var
->data
.explicit_xfb_offset
) {
152 const glsl_type
*type
, *member_type
;
154 if (var
->data
.from_named_ifc_block
) {
155 type
= var
->get_interface_type();
156 /* Find the member type before it was altered by lowering */
158 type
->fields
.structure
[type
->field_index(var
->name
)].type
;
159 name
= ralloc_strdup(NULL
, type
->without_array()->name
);
163 name
= ralloc_strdup(NULL
, var
->name
);
165 create_xfb_varying_names(mem_ctx
, type
, &name
, strlen(name
), &i
,
166 var
->name
, member_type
, varying_names
);
171 assert(i
== *num_tfeedback_decls
);
172 return has_xfb_qualifiers
;
176 * Validate the types and qualifiers of an output from one stage against the
177 * matching input to another stage.
180 cross_validate_types_and_qualifiers(struct gl_shader_program
*prog
,
181 const ir_variable
*input
,
182 const ir_variable
*output
,
183 gl_shader_stage consumer_stage
,
184 gl_shader_stage producer_stage
)
186 /* Check that the types match between stages.
188 const glsl_type
*type_to_match
= input
->type
;
190 /* VS -> GS, VS -> TCS, VS -> TES, TES -> GS */
191 const bool extra_array_level
= (producer_stage
== MESA_SHADER_VERTEX
&&
192 consumer_stage
!= MESA_SHADER_FRAGMENT
) ||
193 consumer_stage
== MESA_SHADER_GEOMETRY
;
194 if (extra_array_level
) {
195 assert(type_to_match
->is_array());
196 type_to_match
= type_to_match
->fields
.array
;
199 if (type_to_match
!= output
->type
) {
200 /* There is a bit of a special case for gl_TexCoord. This
201 * built-in is unsized by default. Applications that variable
202 * access it must redeclare it with a size. There is some
203 * language in the GLSL spec that implies the fragment shader
204 * and vertex shader do not have to agree on this size. Other
205 * driver behave this way, and one or two applications seem to
208 * Neither declaration needs to be modified here because the array
209 * sizes are fixed later when update_array_sizes is called.
211 * From page 48 (page 54 of the PDF) of the GLSL 1.10 spec:
213 * "Unlike user-defined varying variables, the built-in
214 * varying variables don't have a strict one-to-one
215 * correspondence between the vertex language and the
216 * fragment language."
218 if (!output
->type
->is_array() || !is_gl_identifier(output
->name
)) {
220 "%s shader output `%s' declared as type `%s', "
221 "but %s shader input declared as type `%s'\n",
222 _mesa_shader_stage_to_string(producer_stage
),
225 _mesa_shader_stage_to_string(consumer_stage
),
231 /* Check that all of the qualifiers match between stages.
233 if (input
->data
.centroid
!= output
->data
.centroid
) {
235 "%s shader output `%s' %s centroid qualifier, "
236 "but %s shader input %s centroid qualifier\n",
237 _mesa_shader_stage_to_string(producer_stage
),
239 (output
->data
.centroid
) ? "has" : "lacks",
240 _mesa_shader_stage_to_string(consumer_stage
),
241 (input
->data
.centroid
) ? "has" : "lacks");
245 if (input
->data
.sample
!= output
->data
.sample
) {
247 "%s shader output `%s' %s sample qualifier, "
248 "but %s shader input %s sample qualifier\n",
249 _mesa_shader_stage_to_string(producer_stage
),
251 (output
->data
.sample
) ? "has" : "lacks",
252 _mesa_shader_stage_to_string(consumer_stage
),
253 (input
->data
.sample
) ? "has" : "lacks");
257 if (input
->data
.patch
!= output
->data
.patch
) {
259 "%s shader output `%s' %s patch qualifier, "
260 "but %s shader input %s patch qualifier\n",
261 _mesa_shader_stage_to_string(producer_stage
),
263 (output
->data
.patch
) ? "has" : "lacks",
264 _mesa_shader_stage_to_string(consumer_stage
),
265 (input
->data
.patch
) ? "has" : "lacks");
269 if (!prog
->IsES
&& input
->data
.invariant
!= output
->data
.invariant
) {
271 "%s shader output `%s' %s invariant qualifier, "
272 "but %s shader input %s invariant qualifier\n",
273 _mesa_shader_stage_to_string(producer_stage
),
275 (output
->data
.invariant
) ? "has" : "lacks",
276 _mesa_shader_stage_to_string(consumer_stage
),
277 (input
->data
.invariant
) ? "has" : "lacks");
281 /* GLSL >= 4.40 removes text requiring interpolation qualifiers
282 * to match cross stage, they must only match within the same stage.
284 * From page 84 (page 90 of the PDF) of the GLSL 4.40 spec:
286 * "It is a link-time error if, within the same stage, the interpolation
287 * qualifiers of variables of the same name do not match.
290 if (input
->data
.interpolation
!= output
->data
.interpolation
&&
291 prog
->Version
< 440) {
293 "%s shader output `%s' specifies %s "
294 "interpolation qualifier, "
295 "but %s shader input specifies %s "
296 "interpolation qualifier\n",
297 _mesa_shader_stage_to_string(producer_stage
),
299 interpolation_string(output
->data
.interpolation
),
300 _mesa_shader_stage_to_string(consumer_stage
),
301 interpolation_string(input
->data
.interpolation
));
307 * Validate front and back color outputs against single color input
310 cross_validate_front_and_back_color(struct gl_shader_program
*prog
,
311 const ir_variable
*input
,
312 const ir_variable
*front_color
,
313 const ir_variable
*back_color
,
314 gl_shader_stage consumer_stage
,
315 gl_shader_stage producer_stage
)
317 if (front_color
!= NULL
&& front_color
->data
.assigned
)
318 cross_validate_types_and_qualifiers(prog
, input
, front_color
,
319 consumer_stage
, producer_stage
);
321 if (back_color
!= NULL
&& back_color
->data
.assigned
)
322 cross_validate_types_and_qualifiers(prog
, input
, back_color
,
323 consumer_stage
, producer_stage
);
327 * Validate that outputs from one stage match inputs of another
330 cross_validate_outputs_to_inputs(struct gl_shader_program
*prog
,
331 gl_shader
*producer
, gl_shader
*consumer
)
333 glsl_symbol_table parameters
;
334 ir_variable
*explicit_locations
[MAX_VARYING
] = { NULL
, };
336 /* Find all shader outputs in the "producer" stage.
338 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
339 ir_variable
*const var
= node
->as_variable();
341 if ((var
== NULL
) || (var
->data
.mode
!= ir_var_shader_out
))
344 if (!var
->data
.explicit_location
345 || var
->data
.location
< VARYING_SLOT_VAR0
)
346 parameters
.add_variable(var
);
348 /* User-defined varyings with explicit locations are handled
349 * differently because they do not need to have matching names.
351 const unsigned idx
= var
->data
.location
- VARYING_SLOT_VAR0
;
353 if (explicit_locations
[idx
] != NULL
) {
355 "%s shader has multiple outputs explicitly "
356 "assigned to location %d\n",
357 _mesa_shader_stage_to_string(producer
->Stage
),
362 explicit_locations
[idx
] = var
;
367 /* Find all shader inputs in the "consumer" stage. Any variables that have
368 * matching outputs already in the symbol table must have the same type and
371 * Exception: if the consumer is the geometry shader, then the inputs
372 * should be arrays and the type of the array element should match the type
373 * of the corresponding producer output.
375 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
376 ir_variable
*const input
= node
->as_variable();
378 if ((input
== NULL
) || (input
->data
.mode
!= ir_var_shader_in
))
381 if (strcmp(input
->name
, "gl_Color") == 0 && input
->data
.used
) {
382 const ir_variable
*const front_color
=
383 parameters
.get_variable("gl_FrontColor");
385 const ir_variable
*const back_color
=
386 parameters
.get_variable("gl_BackColor");
388 cross_validate_front_and_back_color(prog
, input
,
389 front_color
, back_color
,
390 consumer
->Stage
, producer
->Stage
);
391 } else if (strcmp(input
->name
, "gl_SecondaryColor") == 0 && input
->data
.used
) {
392 const ir_variable
*const front_color
=
393 parameters
.get_variable("gl_FrontSecondaryColor");
395 const ir_variable
*const back_color
=
396 parameters
.get_variable("gl_BackSecondaryColor");
398 cross_validate_front_and_back_color(prog
, input
,
399 front_color
, back_color
,
400 consumer
->Stage
, producer
->Stage
);
402 /* The rules for connecting inputs and outputs change in the presence
403 * of explicit locations. In this case, we no longer care about the
404 * names of the variables. Instead, we care only about the
405 * explicitly assigned location.
407 ir_variable
*output
= NULL
;
408 if (input
->data
.explicit_location
409 && input
->data
.location
>= VARYING_SLOT_VAR0
) {
410 output
= explicit_locations
[input
->data
.location
- VARYING_SLOT_VAR0
];
412 if (output
== NULL
) {
414 "%s shader input `%s' with explicit location "
415 "has no matching output\n",
416 _mesa_shader_stage_to_string(consumer
->Stage
),
420 output
= parameters
.get_variable(input
->name
);
423 if (output
!= NULL
) {
424 /* Interface blocks have their own validation elsewhere so don't
425 * try validating them here.
427 if (!(input
->get_interface_type() &&
428 output
->get_interface_type()))
429 cross_validate_types_and_qualifiers(prog
, input
, output
,
433 /* Check for input vars with unmatched output vars in prev stage
434 * taking into account that interface blocks could have a matching
435 * output but with different name, so we ignore them.
437 assert(!input
->data
.assigned
);
438 if (input
->data
.used
&& !input
->get_interface_type() &&
439 !input
->data
.explicit_location
&& !prog
->SeparateShader
)
441 "%s shader input `%s' "
442 "has no matching output in the previous stage\n",
443 _mesa_shader_stage_to_string(consumer
->Stage
),
451 * Demote shader inputs and outputs that are not used in other stages, and
452 * remove them via dead code elimination.
455 remove_unused_shader_inputs_and_outputs(bool is_separate_shader_object
,
457 enum ir_variable_mode mode
)
459 if (is_separate_shader_object
)
462 foreach_in_list(ir_instruction
, node
, sh
->ir
) {
463 ir_variable
*const var
= node
->as_variable();
465 if ((var
== NULL
) || (var
->data
.mode
!= int(mode
)))
468 /* A shader 'in' or 'out' variable is only really an input or output if
469 * its value is used by other shader stages. This will cause the
470 * variable to have a location assigned.
472 if (var
->data
.is_unmatched_generic_inout
) {
473 assert(var
->data
.mode
!= ir_var_temporary
);
474 var
->data
.mode
= ir_var_auto
;
478 /* Eliminate code that is now dead due to unused inputs/outputs being
481 while (do_dead_code(sh
->ir
, false))
487 * Initialize this object based on a string that was passed to
488 * glTransformFeedbackVaryings.
490 * If the input is mal-formed, this call still succeeds, but it sets
491 * this->var_name to a mal-formed input, so tfeedback_decl::find_output_var()
492 * will fail to find any matching variable.
495 tfeedback_decl::init(struct gl_context
*ctx
, const void *mem_ctx
,
498 /* We don't have to be pedantic about what is a valid GLSL variable name,
499 * because any variable with an invalid name can't exist in the IR anyway.
503 this->orig_name
= input
;
504 this->lowered_builtin_array_variable
= none
;
505 this->skip_components
= 0;
506 this->next_buffer_separator
= false;
507 this->matched_candidate
= NULL
;
512 if (ctx
->Extensions
.ARB_transform_feedback3
) {
513 /* Parse gl_NextBuffer. */
514 if (strcmp(input
, "gl_NextBuffer") == 0) {
515 this->next_buffer_separator
= true;
519 /* Parse gl_SkipComponents. */
520 if (strcmp(input
, "gl_SkipComponents1") == 0)
521 this->skip_components
= 1;
522 else if (strcmp(input
, "gl_SkipComponents2") == 0)
523 this->skip_components
= 2;
524 else if (strcmp(input
, "gl_SkipComponents3") == 0)
525 this->skip_components
= 3;
526 else if (strcmp(input
, "gl_SkipComponents4") == 0)
527 this->skip_components
= 4;
529 if (this->skip_components
)
533 /* Parse a declaration. */
534 const char *base_name_end
;
535 long subscript
= parse_program_resource_name(input
, &base_name_end
);
536 this->var_name
= ralloc_strndup(mem_ctx
, input
, base_name_end
- input
);
537 if (this->var_name
== NULL
) {
538 _mesa_error_no_memory(__func__
);
542 if (subscript
>= 0) {
543 this->array_subscript
= subscript
;
544 this->is_subscripted
= true;
546 this->is_subscripted
= false;
549 /* For drivers that lower gl_ClipDistance to gl_ClipDistanceMESA, this
550 * class must behave specially to account for the fact that gl_ClipDistance
551 * is converted from a float[8] to a vec4[2].
553 if (ctx
->Const
.ShaderCompilerOptions
[MESA_SHADER_VERTEX
].LowerClipDistance
&&
554 strcmp(this->var_name
, "gl_ClipDistance") == 0) {
555 this->lowered_builtin_array_variable
= clip_distance
;
558 if (ctx
->Const
.LowerTessLevel
&&
559 (strcmp(this->var_name
, "gl_TessLevelOuter") == 0))
560 this->lowered_builtin_array_variable
= tess_level_outer
;
561 if (ctx
->Const
.LowerTessLevel
&&
562 (strcmp(this->var_name
, "gl_TessLevelInner") == 0))
563 this->lowered_builtin_array_variable
= tess_level_inner
;
568 * Determine whether two tfeedback_decl objects refer to the same variable and
569 * array index (if applicable).
572 tfeedback_decl::is_same(const tfeedback_decl
&x
, const tfeedback_decl
&y
)
574 assert(x
.is_varying() && y
.is_varying());
576 if (strcmp(x
.var_name
, y
.var_name
) != 0)
578 if (x
.is_subscripted
!= y
.is_subscripted
)
580 if (x
.is_subscripted
&& x
.array_subscript
!= y
.array_subscript
)
587 * Assign a location and stream ID for this tfeedback_decl object based on the
588 * transform feedback candidate found by find_candidate.
590 * If an error occurs, the error is reported through linker_error() and false
594 tfeedback_decl::assign_location(struct gl_context
*ctx
,
595 struct gl_shader_program
*prog
)
597 assert(this->is_varying());
599 unsigned fine_location
600 = this->matched_candidate
->toplevel_var
->data
.location
* 4
601 + this->matched_candidate
->toplevel_var
->data
.location_frac
602 + this->matched_candidate
->offset
;
603 const unsigned dmul
=
604 this->matched_candidate
->type
->without_array()->is_double() ? 2 : 1;
606 if (this->matched_candidate
->type
->is_array()) {
608 const unsigned matrix_cols
=
609 this->matched_candidate
->type
->fields
.array
->matrix_columns
;
610 const unsigned vector_elements
=
611 this->matched_candidate
->type
->fields
.array
->vector_elements
;
612 unsigned actual_array_size
;
613 switch (this->lowered_builtin_array_variable
) {
615 actual_array_size
= prog
->LastClipDistanceArraySize
;
617 case tess_level_outer
:
618 actual_array_size
= 4;
620 case tess_level_inner
:
621 actual_array_size
= 2;
625 actual_array_size
= this->matched_candidate
->type
->array_size();
629 if (this->is_subscripted
) {
630 /* Check array bounds. */
631 if (this->array_subscript
>= actual_array_size
) {
632 linker_error(prog
, "Transform feedback varying %s has index "
633 "%i, but the array size is %u.",
634 this->orig_name
, this->array_subscript
,
638 unsigned array_elem_size
= this->lowered_builtin_array_variable
?
639 1 : vector_elements
* matrix_cols
* dmul
;
640 fine_location
+= array_elem_size
* this->array_subscript
;
643 this->size
= actual_array_size
;
645 this->vector_elements
= vector_elements
;
646 this->matrix_columns
= matrix_cols
;
647 if (this->lowered_builtin_array_variable
)
648 this->type
= GL_FLOAT
;
650 this->type
= this->matched_candidate
->type
->fields
.array
->gl_type
;
652 /* Regular variable (scalar, vector, or matrix) */
653 if (this->is_subscripted
) {
654 linker_error(prog
, "Transform feedback varying %s requested, "
655 "but %s is not an array.",
656 this->orig_name
, this->var_name
);
660 this->vector_elements
= this->matched_candidate
->type
->vector_elements
;
661 this->matrix_columns
= this->matched_candidate
->type
->matrix_columns
;
662 this->type
= this->matched_candidate
->type
->gl_type
;
664 this->location
= fine_location
/ 4;
665 this->location_frac
= fine_location
% 4;
667 /* From GL_EXT_transform_feedback:
668 * A program will fail to link if:
670 * * the total number of components to capture in any varying
671 * variable in <varyings> is greater than the constant
672 * MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS_EXT and the
673 * buffer mode is SEPARATE_ATTRIBS_EXT;
675 if (prog
->TransformFeedback
.BufferMode
== GL_SEPARATE_ATTRIBS
&&
676 this->num_components() >
677 ctx
->Const
.MaxTransformFeedbackSeparateComponents
) {
678 linker_error(prog
, "Transform feedback varying %s exceeds "
679 "MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS.",
684 /* Only transform feedback varyings can be assigned to non-zero streams,
685 * so assign the stream id here.
687 this->stream_id
= this->matched_candidate
->toplevel_var
->data
.stream
;
689 unsigned array_offset
= this->array_subscript
* 4 * dmul
;
690 unsigned struct_offset
= this->matched_candidate
->offset
* 4 * dmul
;
691 this->buffer
= this->matched_candidate
->toplevel_var
->data
.xfb_buffer
;
692 this->offset
= this->matched_candidate
->toplevel_var
->data
.offset
+
693 array_offset
+ struct_offset
;
700 tfeedback_decl::get_num_outputs() const
702 if (!this->is_varying()) {
705 return (this->num_components() + this->location_frac
+ 3)/4;
710 * Update gl_transform_feedback_info to reflect this tfeedback_decl.
712 * If an error occurs, the error is reported through linker_error() and false
716 tfeedback_decl::store(struct gl_context
*ctx
, struct gl_shader_program
*prog
,
717 struct gl_transform_feedback_info
*info
,
718 unsigned buffer
, const unsigned max_outputs
,
719 bool *explicit_stride
, bool has_xfb_qualifiers
) const
721 assert(!this->next_buffer_separator
);
723 /* Handle gl_SkipComponents. */
724 if (this->skip_components
) {
725 info
->Buffers
[buffer
].Stride
+= this->skip_components
;
729 unsigned xfb_offset
= 0;
730 if (has_xfb_qualifiers
) {
731 xfb_offset
= this->offset
/ 4;
733 xfb_offset
= info
->Buffers
[buffer
].Stride
;
736 unsigned location
= this->location
;
737 unsigned location_frac
= this->location_frac
;
738 unsigned num_components
= this->num_components();
739 while (num_components
> 0) {
740 unsigned output_size
= MIN2(num_components
, 4 - location_frac
);
741 assert((info
->NumOutputs
== 0 && max_outputs
== 0) ||
742 info
->NumOutputs
< max_outputs
);
744 /* From the ARB_enhanced_layouts spec:
746 * "If such a block member or variable is not written during a shader
747 * invocation, the buffer contents at the assigned offset will be
748 * undefined. Even if there are no static writes to a variable or
749 * member that is assigned a transform feedback offset, the space is
750 * still allocated in the buffer and still affects the stride."
752 if (this->is_varying_written()) {
753 info
->Outputs
[info
->NumOutputs
].ComponentOffset
= location_frac
;
754 info
->Outputs
[info
->NumOutputs
].OutputRegister
= location
;
755 info
->Outputs
[info
->NumOutputs
].NumComponents
= output_size
;
756 info
->Outputs
[info
->NumOutputs
].StreamId
= stream_id
;
757 info
->Outputs
[info
->NumOutputs
].OutputBuffer
= buffer
;
758 info
->Outputs
[info
->NumOutputs
].DstOffset
= xfb_offset
;
761 info
->Buffers
[buffer
].Stream
= this->stream_id
;
762 xfb_offset
+= output_size
;
764 num_components
-= output_size
;
769 if (explicit_stride
&& explicit_stride
[buffer
]) {
770 if (this->is_double() && info
->Buffers
[buffer
].Stride
% 2) {
771 linker_error(prog
, "invalid qualifier xfb_stride=%d must be a "
772 "multiple of 8 as its applied to a type that is or "
773 "contains a double.",
774 info
->Buffers
[buffer
].Stride
* 4);
778 if ((this->offset
/ 4) / info
->Buffers
[buffer
].Stride
!=
779 (xfb_offset
- 1) / info
->Buffers
[buffer
].Stride
) {
780 linker_error(prog
, "xfb_offset (%d) overflows xfb_stride (%d) for "
781 "buffer (%d)", xfb_offset
* 4,
782 info
->Buffers
[buffer
].Stride
* 4, buffer
);
786 info
->Buffers
[buffer
].Stride
= xfb_offset
;
789 /* From GL_EXT_transform_feedback:
790 * A program will fail to link if:
792 * * the total number of components to capture is greater than
793 * the constant MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS_EXT
794 * and the buffer mode is INTERLEAVED_ATTRIBS_EXT.
796 * From GL_ARB_enhanced_layouts:
798 * "The resulting stride (implicit or explicit) must be less than or
799 * equal to the implementation-dependent constant
800 * gl_MaxTransformFeedbackInterleavedComponents."
802 if ((prog
->TransformFeedback
.BufferMode
== GL_INTERLEAVED_ATTRIBS
||
803 has_xfb_qualifiers
) &&
804 info
->Buffers
[buffer
].Stride
>
805 ctx
->Const
.MaxTransformFeedbackInterleavedComponents
) {
806 linker_error(prog
, "The MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS "
807 "limit has been exceeded.");
811 info
->Varyings
[info
->NumVarying
].Name
= ralloc_strdup(prog
,
813 info
->Varyings
[info
->NumVarying
].Type
= this->type
;
814 info
->Varyings
[info
->NumVarying
].Size
= this->size
;
821 const tfeedback_candidate
*
822 tfeedback_decl::find_candidate(gl_shader_program
*prog
,
823 hash_table
*tfeedback_candidates
)
825 const char *name
= this->var_name
;
826 switch (this->lowered_builtin_array_variable
) {
828 name
= this->var_name
;
831 name
= "gl_ClipDistanceMESA";
833 case tess_level_outer
:
834 name
= "gl_TessLevelOuterMESA";
836 case tess_level_inner
:
837 name
= "gl_TessLevelInnerMESA";
840 this->matched_candidate
= (const tfeedback_candidate
*)
841 hash_table_find(tfeedback_candidates
, name
);
842 if (!this->matched_candidate
) {
843 /* From GL_EXT_transform_feedback:
844 * A program will fail to link if:
846 * * any variable name specified in the <varyings> array is not
847 * declared as an output in the geometry shader (if present) or
848 * the vertex shader (if no geometry shader is present);
850 linker_error(prog
, "Transform feedback varying %s undeclared.",
853 return this->matched_candidate
;
858 * Parse all the transform feedback declarations that were passed to
859 * glTransformFeedbackVaryings() and store them in tfeedback_decl objects.
861 * If an error occurs, the error is reported through linker_error() and false
865 parse_tfeedback_decls(struct gl_context
*ctx
, struct gl_shader_program
*prog
,
866 const void *mem_ctx
, unsigned num_names
,
867 char **varying_names
, tfeedback_decl
*decls
)
869 for (unsigned i
= 0; i
< num_names
; ++i
) {
870 decls
[i
].init(ctx
, mem_ctx
, varying_names
[i
]);
872 if (!decls
[i
].is_varying())
875 /* From GL_EXT_transform_feedback:
876 * A program will fail to link if:
878 * * any two entries in the <varyings> array specify the same varying
881 * We interpret this to mean "any two entries in the <varyings> array
882 * specify the same varying variable and array index", since transform
883 * feedback of arrays would be useless otherwise.
885 for (unsigned j
= 0; j
< i
; ++j
) {
886 if (!decls
[j
].is_varying())
889 if (tfeedback_decl::is_same(decls
[i
], decls
[j
])) {
890 linker_error(prog
, "Transform feedback varying %s specified "
891 "more than once.", varying_names
[i
]);
901 cmp_xfb_offset(const void * x_generic
, const void * y_generic
)
903 tfeedback_decl
*x
= (tfeedback_decl
*) x_generic
;
904 tfeedback_decl
*y
= (tfeedback_decl
*) y_generic
;
906 if (x
->get_buffer() != y
->get_buffer())
907 return x
->get_buffer() - y
->get_buffer();
908 return x
->get_offset() - y
->get_offset();
912 * Store transform feedback location assignments into
913 * prog->LinkedTransformFeedback based on the data stored in tfeedback_decls.
915 * If an error occurs, the error is reported through linker_error() and false
919 store_tfeedback_info(struct gl_context
*ctx
, struct gl_shader_program
*prog
,
920 unsigned num_tfeedback_decls
,
921 tfeedback_decl
*tfeedback_decls
, bool has_xfb_qualifiers
)
923 /* Make sure MaxTransformFeedbackBuffers is less than 32 so the bitmask for
924 * tracking the number of buffers doesn't overflow.
926 assert(ctx
->Const
.MaxTransformFeedbackBuffers
< 32);
928 bool separate_attribs_mode
=
929 prog
->TransformFeedback
.BufferMode
== GL_SEPARATE_ATTRIBS
;
931 ralloc_free(prog
->LinkedTransformFeedback
.Varyings
);
932 ralloc_free(prog
->LinkedTransformFeedback
.Outputs
);
934 memset(&prog
->LinkedTransformFeedback
, 0,
935 sizeof(prog
->LinkedTransformFeedback
));
937 /* The xfb_offset qualifier does not have to be used in increasing order
938 * however some drivers expect to receive the list of transform feedback
939 * declarations in order so sort it now for convenience.
941 if (has_xfb_qualifiers
)
942 qsort(tfeedback_decls
, num_tfeedback_decls
, sizeof(*tfeedback_decls
),
945 prog
->LinkedTransformFeedback
.Varyings
=
947 struct gl_transform_feedback_varying_info
,
948 num_tfeedback_decls
);
950 unsigned num_outputs
= 0;
951 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
952 if (tfeedback_decls
[i
].is_varying_written())
953 num_outputs
+= tfeedback_decls
[i
].get_num_outputs();
956 prog
->LinkedTransformFeedback
.Outputs
=
958 struct gl_transform_feedback_output
,
961 unsigned num_buffers
= 0;
962 unsigned buffers
= 0;
964 if (!has_xfb_qualifiers
&& separate_attribs_mode
) {
965 /* GL_SEPARATE_ATTRIBS */
966 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
967 if (!tfeedback_decls
[i
].store(ctx
, prog
, &prog
->LinkedTransformFeedback
,
968 num_buffers
, num_outputs
, NULL
,
972 buffers
|= 1 << num_buffers
;
977 /* GL_INVERLEAVED_ATTRIBS */
978 int buffer_stream_id
= -1;
980 num_tfeedback_decls
? tfeedback_decls
[0].get_buffer() : 0;
981 bool explicit_stride
[MAX_FEEDBACK_BUFFERS
] = { false };
983 /* Apply any xfb_stride global qualifiers */
984 if (has_xfb_qualifiers
) {
985 for (unsigned j
= 0; j
< MAX_FEEDBACK_BUFFERS
; j
++) {
986 if (prog
->TransformFeedback
.BufferStride
[j
]) {
988 explicit_stride
[j
] = true;
989 prog
->LinkedTransformFeedback
.Buffers
[j
].Stride
=
990 prog
->TransformFeedback
.BufferStride
[j
] / 4;
995 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
996 if (has_xfb_qualifiers
&&
997 buffer
!= tfeedback_decls
[i
].get_buffer()) {
998 /* we have moved to the next buffer so reset stream id */
999 buffer_stream_id
= -1;
1002 if (tfeedback_decls
[i
].is_next_buffer_separator()) {
1004 buffer_stream_id
= -1;
1006 } else if (buffer_stream_id
== -1) {
1007 /* First varying writing to this buffer: remember its stream */
1008 buffer_stream_id
= (int) tfeedback_decls
[i
].get_stream_id();
1009 } else if (buffer_stream_id
!=
1010 (int) tfeedback_decls
[i
].get_stream_id()) {
1011 /* Varying writes to the same buffer from a different stream */
1013 "Transform feedback can't capture varyings belonging "
1014 "to different vertex streams in a single buffer. "
1015 "Varying %s writes to buffer from stream %u, other "
1016 "varyings in the same buffer write from stream %u.",
1017 tfeedback_decls
[i
].name(),
1018 tfeedback_decls
[i
].get_stream_id(),
1023 if (has_xfb_qualifiers
) {
1024 buffer
= tfeedback_decls
[i
].get_buffer();
1026 buffer
= num_buffers
;
1028 buffers
|= 1 << num_buffers
;
1030 if (!tfeedback_decls
[i
].store(ctx
, prog
,
1031 &prog
->LinkedTransformFeedback
,
1032 num_buffers
, num_outputs
,
1033 explicit_stride
, has_xfb_qualifiers
))
1038 assert(prog
->LinkedTransformFeedback
.NumOutputs
== num_outputs
);
1040 prog
->LinkedTransformFeedback
.ActiveBuffers
= buffers
;
1047 * Data structure recording the relationship between outputs of one shader
1048 * stage (the "producer") and inputs of another (the "consumer").
1050 class varying_matches
1053 varying_matches(bool disable_varying_packing
, bool xfb_enabled
,
1054 gl_shader_stage producer_stage
,
1055 gl_shader_stage consumer_stage
);
1057 void record(ir_variable
*producer_var
, ir_variable
*consumer_var
);
1058 unsigned assign_locations(struct gl_shader_program
*prog
,
1059 uint64_t reserved_slots
, bool separate_shader
);
1060 void store_locations() const;
1063 bool is_varying_packing_safe(const glsl_type
*type
,
1064 const ir_variable
*var
);
1067 * If true, this driver disables varying packing, so all varyings need to
1068 * be aligned on slot boundaries, and take up a number of slots equal to
1069 * their number of matrix columns times their array size.
1071 * Packing may also be disabled because our current packing method is not
1072 * safe in SSO or versions of OpenGL where interpolation qualifiers are not
1073 * guaranteed to match across stages.
1075 const bool disable_varying_packing
;
1078 * If true, this driver has transform feedback enabled. The transform
1079 * feedback code requires at least some packing be done even when varying
1080 * packing is disabled, fortunately where transform feedback requires
1081 * packing it's safe to override the disabled setting. See
1082 * is_varying_packing_safe().
1084 const bool xfb_enabled
;
1087 * Enum representing the order in which varyings are packed within a
1090 * Currently we pack vec4's first, then vec2's, then scalar values, then
1091 * vec3's. This order ensures that the only vectors that are at risk of
1092 * having to be "double parked" (split between two adjacent varying slots)
1095 enum packing_order_enum
{
1098 PACKING_ORDER_SCALAR
,
1102 static unsigned compute_packing_class(const ir_variable
*var
);
1103 static packing_order_enum
compute_packing_order(const ir_variable
*var
);
1104 static int match_comparator(const void *x_generic
, const void *y_generic
);
1105 static int xfb_comparator(const void *x_generic
, const void *y_generic
);
1108 * Structure recording the relationship between a single producer output
1109 * and a single consumer input.
1113 * Packing class for this varying, computed by compute_packing_class().
1115 unsigned packing_class
;
1118 * Packing order for this varying, computed by compute_packing_order().
1120 packing_order_enum packing_order
;
1121 unsigned num_components
;
1124 * The output variable in the producer stage.
1126 ir_variable
*producer_var
;
1129 * The input variable in the consumer stage.
1131 ir_variable
*consumer_var
;
1134 * The location which has been assigned for this varying. This is
1135 * expressed in multiples of a float, with the first generic varying
1136 * (i.e. the one referred to by VARYING_SLOT_VAR0) represented by the
1139 unsigned generic_location
;
1143 * The number of elements in the \c matches array that are currently in
1146 unsigned num_matches
;
1149 * The number of elements that were set aside for the \c matches array when
1152 unsigned matches_capacity
;
1154 gl_shader_stage producer_stage
;
1155 gl_shader_stage consumer_stage
;
1158 } /* anonymous namespace */
1160 varying_matches::varying_matches(bool disable_varying_packing
,
1162 gl_shader_stage producer_stage
,
1163 gl_shader_stage consumer_stage
)
1164 : disable_varying_packing(disable_varying_packing
),
1165 xfb_enabled(xfb_enabled
),
1166 producer_stage(producer_stage
),
1167 consumer_stage(consumer_stage
)
1169 /* Note: this initial capacity is rather arbitrarily chosen to be large
1170 * enough for many cases without wasting an unreasonable amount of space.
1171 * varying_matches::record() will resize the array if there are more than
1172 * this number of varyings.
1174 this->matches_capacity
= 8;
1175 this->matches
= (match
*)
1176 malloc(sizeof(*this->matches
) * this->matches_capacity
);
1177 this->num_matches
= 0;
1181 varying_matches::~varying_matches()
1183 free(this->matches
);
1188 * Packing is always safe on individual arrays, structure and matices. It is
1189 * also safe if the varying is only used for transform feedback.
1192 varying_matches::is_varying_packing_safe(const glsl_type
*type
,
1193 const ir_variable
*var
)
1195 if (consumer_stage
== MESA_SHADER_TESS_EVAL
||
1196 consumer_stage
== MESA_SHADER_TESS_CTRL
||
1197 producer_stage
== MESA_SHADER_TESS_CTRL
)
1200 return xfb_enabled
&& (type
->is_array() || type
->is_record() ||
1201 type
->is_matrix() || var
->data
.is_xfb_only
);
1206 * Record the given producer/consumer variable pair in the list of variables
1207 * that should later be assigned locations.
1209 * It is permissible for \c consumer_var to be NULL (this happens if a
1210 * variable is output by the producer and consumed by transform feedback, but
1211 * not consumed by the consumer).
1213 * If \c producer_var has already been paired up with a consumer_var, or
1214 * producer_var is part of fixed pipeline functionality (and hence already has
1215 * a location assigned), this function has no effect.
1217 * Note: as a side effect this function may change the interpolation type of
1218 * \c producer_var, but only when the change couldn't possibly affect
1222 varying_matches::record(ir_variable
*producer_var
, ir_variable
*consumer_var
)
1224 assert(producer_var
!= NULL
|| consumer_var
!= NULL
);
1226 if ((producer_var
&& (!producer_var
->data
.is_unmatched_generic_inout
||
1227 producer_var
->data
.explicit_location
)) ||
1228 (consumer_var
&& (!consumer_var
->data
.is_unmatched_generic_inout
||
1229 consumer_var
->data
.explicit_location
))) {
1230 /* Either a location already exists for this variable (since it is part
1231 * of fixed functionality), or it has already been recorded as part of a
1237 bool needs_flat_qualifier
= consumer_var
== NULL
&&
1238 (producer_var
->type
->contains_integer() ||
1239 producer_var
->type
->contains_double());
1241 if (needs_flat_qualifier
||
1242 (consumer_stage
!= -1 && consumer_stage
!= MESA_SHADER_FRAGMENT
)) {
1243 /* Since this varying is not being consumed by the fragment shader, its
1244 * interpolation type varying cannot possibly affect rendering.
1245 * Also, this variable is non-flat and is (or contains) an integer
1247 * If the consumer stage is unknown, don't modify the interpolation
1248 * type as it could affect rendering later with separate shaders.
1250 * lower_packed_varyings requires all integer varyings to flat,
1251 * regardless of where they appear. We can trivially satisfy that
1252 * requirement by changing the interpolation type to flat here.
1255 producer_var
->data
.centroid
= false;
1256 producer_var
->data
.sample
= false;
1257 producer_var
->data
.interpolation
= INTERP_QUALIFIER_FLAT
;
1261 consumer_var
->data
.centroid
= false;
1262 consumer_var
->data
.sample
= false;
1263 consumer_var
->data
.interpolation
= INTERP_QUALIFIER_FLAT
;
1267 if (this->num_matches
== this->matches_capacity
) {
1268 this->matches_capacity
*= 2;
1269 this->matches
= (match
*)
1270 realloc(this->matches
,
1271 sizeof(*this->matches
) * this->matches_capacity
);
1274 const ir_variable
*const var
= (producer_var
!= NULL
)
1275 ? producer_var
: consumer_var
;
1276 const gl_shader_stage stage
= (producer_var
!= NULL
)
1277 ? producer_stage
: consumer_stage
;
1278 const glsl_type
*type
= get_varying_type(var
, stage
);
1280 this->matches
[this->num_matches
].packing_class
1281 = this->compute_packing_class(var
);
1282 this->matches
[this->num_matches
].packing_order
1283 = this->compute_packing_order(var
);
1284 if (this->disable_varying_packing
&& !is_varying_packing_safe(type
, var
)) {
1285 unsigned slots
= type
->count_attribute_slots(false);
1286 this->matches
[this->num_matches
].num_components
= slots
* 4;
1288 this->matches
[this->num_matches
].num_components
1289 = type
->component_slots();
1291 this->matches
[this->num_matches
].producer_var
= producer_var
;
1292 this->matches
[this->num_matches
].consumer_var
= consumer_var
;
1293 this->num_matches
++;
1295 producer_var
->data
.is_unmatched_generic_inout
= 0;
1297 consumer_var
->data
.is_unmatched_generic_inout
= 0;
1302 * Choose locations for all of the variable matches that were previously
1303 * passed to varying_matches::record().
1306 varying_matches::assign_locations(struct gl_shader_program
*prog
,
1307 uint64_t reserved_slots
,
1308 bool separate_shader
)
1310 /* If packing has been disabled then we cannot safely sort the varyings by
1311 * class as it may mean we are using a version of OpenGL where
1312 * interpolation qualifiers are not guaranteed to be matching across
1313 * shaders, sorting in this case could result in mismatching shader
1315 * When packing is disabled the sort orders varyings used by transform
1316 * feedback first, but also depends on *undefined behaviour* of qsort to
1317 * reverse the order of the varyings. See: xfb_comparator().
1319 if (!this->disable_varying_packing
) {
1320 /* Sort varying matches into an order that makes them easy to pack. */
1321 qsort(this->matches
, this->num_matches
, sizeof(*this->matches
),
1322 &varying_matches::match_comparator
);
1324 /* Only sort varyings that are only used by transform feedback. */
1325 qsort(this->matches
, this->num_matches
, sizeof(*this->matches
),
1326 &varying_matches::xfb_comparator
);
1329 unsigned generic_location
= 0;
1330 unsigned generic_patch_location
= MAX_VARYING
*4;
1331 bool previous_var_xfb_only
= false;
1333 for (unsigned i
= 0; i
< this->num_matches
; i
++) {
1334 unsigned *location
= &generic_location
;
1336 const ir_variable
*var
;
1337 const glsl_type
*type
;
1338 bool is_vertex_input
= false;
1339 if (matches
[i
].consumer_var
) {
1340 var
= matches
[i
].consumer_var
;
1341 type
= get_varying_type(var
, consumer_stage
);
1342 if (consumer_stage
== MESA_SHADER_VERTEX
)
1343 is_vertex_input
= true;
1345 var
= matches
[i
].producer_var
;
1346 type
= get_varying_type(var
, producer_stage
);
1349 if (var
->data
.patch
)
1350 location
= &generic_patch_location
;
1352 /* Advance to the next slot if this varying has a different packing
1353 * class than the previous one, and we're not already on a slot
1356 * Also advance to the next slot if packing is disabled. This makes sure
1357 * we don't assign varyings the same locations which is possible
1358 * because we still pack individual arrays, records and matrices even
1359 * when packing is disabled. Note we don't advance to the next slot if
1360 * we can pack varyings together that are only used for transform
1363 if ((this->disable_varying_packing
&&
1364 !(previous_var_xfb_only
&& var
->data
.is_xfb_only
)) ||
1365 (i
> 0 && this->matches
[i
- 1].packing_class
1366 != this->matches
[i
].packing_class
)) {
1367 *location
= ALIGN(*location
, 4);
1370 previous_var_xfb_only
= var
->data
.is_xfb_only
;
1372 unsigned num_elements
= type
->count_attribute_slots(is_vertex_input
);
1374 if (this->disable_varying_packing
&&
1375 !is_varying_packing_safe(type
, var
))
1378 slot_end
= type
->without_array()->vector_elements
;
1379 slot_end
+= *location
- 1;
1381 /* FIXME: We could be smarter in the below code and loop back over
1382 * trying to fill any locations that we skipped because we couldn't pack
1383 * the varying between an explicit location. For now just let the user
1384 * hit the linking error if we run out of room and suggest they use
1385 * explicit locations.
1387 for (unsigned j
= 0; j
< num_elements
; j
++) {
1388 while ((slot_end
< MAX_VARYING
* 4u) &&
1389 ((reserved_slots
& (UINT64_C(1) << *location
/ 4u) ||
1390 (reserved_slots
& (UINT64_C(1) << slot_end
/ 4u))))) {
1392 *location
= ALIGN(*location
+ 1, 4);
1393 slot_end
= *location
;
1395 /* reset the counter and try again */
1399 /* Increase the slot to make sure there is enough room for next
1402 if (this->disable_varying_packing
&&
1403 !is_varying_packing_safe(type
, var
))
1406 slot_end
+= type
->without_array()->vector_elements
;
1409 if (!var
->data
.patch
&& *location
>= MAX_VARYING
* 4u) {
1410 linker_error(prog
, "insufficient contiguous locations available for "
1411 "%s it is possible an array or struct could not be "
1412 "packed between varyings with explicit locations. Try "
1413 "using an explicit location for arrays and structs.",
1417 this->matches
[i
].generic_location
= *location
;
1419 *location
+= this->matches
[i
].num_components
;
1422 return (generic_location
+ 3) / 4;
1427 * Update the producer and consumer shaders to reflect the locations
1428 * assignments that were made by varying_matches::assign_locations().
1431 varying_matches::store_locations() const
1433 for (unsigned i
= 0; i
< this->num_matches
; i
++) {
1434 ir_variable
*producer_var
= this->matches
[i
].producer_var
;
1435 ir_variable
*consumer_var
= this->matches
[i
].consumer_var
;
1436 unsigned generic_location
= this->matches
[i
].generic_location
;
1437 unsigned slot
= generic_location
/ 4;
1438 unsigned offset
= generic_location
% 4;
1441 producer_var
->data
.location
= VARYING_SLOT_VAR0
+ slot
;
1442 producer_var
->data
.location_frac
= offset
;
1446 assert(consumer_var
->data
.location
== -1);
1447 consumer_var
->data
.location
= VARYING_SLOT_VAR0
+ slot
;
1448 consumer_var
->data
.location_frac
= offset
;
1455 * Compute the "packing class" of the given varying. This is an unsigned
1456 * integer with the property that two variables in the same packing class can
1457 * be safely backed into the same vec4.
1460 varying_matches::compute_packing_class(const ir_variable
*var
)
1462 /* Without help from the back-end, there is no way to pack together
1463 * variables with different interpolation types, because
1464 * lower_packed_varyings must choose exactly one interpolation type for
1465 * each packed varying it creates.
1467 * However, we can safely pack together floats, ints, and uints, because:
1469 * - varyings of base type "int" and "uint" must use the "flat"
1470 * interpolation type, which can only occur in GLSL 1.30 and above.
1472 * - On platforms that support GLSL 1.30 and above, lower_packed_varyings
1473 * can store flat floats as ints without losing any information (using
1474 * the ir_unop_bitcast_* opcodes).
1476 * Therefore, the packing class depends only on the interpolation type.
1478 unsigned packing_class
= var
->data
.centroid
| (var
->data
.sample
<< 1) |
1479 (var
->data
.patch
<< 2);
1481 packing_class
+= var
->data
.interpolation
;
1482 return packing_class
;
1487 * Compute the "packing order" of the given varying. This is a sort key we
1488 * use to determine when to attempt to pack the given varying relative to
1489 * other varyings in the same packing class.
1491 varying_matches::packing_order_enum
1492 varying_matches::compute_packing_order(const ir_variable
*var
)
1494 const glsl_type
*element_type
= var
->type
;
1496 while (element_type
->base_type
== GLSL_TYPE_ARRAY
) {
1497 element_type
= element_type
->fields
.array
;
1500 switch (element_type
->component_slots() % 4) {
1501 case 1: return PACKING_ORDER_SCALAR
;
1502 case 2: return PACKING_ORDER_VEC2
;
1503 case 3: return PACKING_ORDER_VEC3
;
1504 case 0: return PACKING_ORDER_VEC4
;
1506 assert(!"Unexpected value of vector_elements");
1507 return PACKING_ORDER_VEC4
;
1513 * Comparison function passed to qsort() to sort varyings by packing_class and
1514 * then by packing_order.
1517 varying_matches::match_comparator(const void *x_generic
, const void *y_generic
)
1519 const match
*x
= (const match
*) x_generic
;
1520 const match
*y
= (const match
*) y_generic
;
1522 if (x
->packing_class
!= y
->packing_class
)
1523 return x
->packing_class
- y
->packing_class
;
1524 return x
->packing_order
- y
->packing_order
;
1529 * Comparison function passed to qsort() to sort varyings used only by
1530 * transform feedback when packing of other varyings is disabled.
1533 varying_matches::xfb_comparator(const void *x_generic
, const void *y_generic
)
1535 const match
*x
= (const match
*) x_generic
;
1537 if (x
->producer_var
!= NULL
&& x
->producer_var
->data
.is_xfb_only
)
1538 return match_comparator(x_generic
, y_generic
);
1540 /* FIXME: When the comparator returns 0 it means the elements being
1541 * compared are equivalent. However the qsort documentation says:
1543 * "The order of equivalent elements is undefined."
1545 * In practice the sort ends up reversing the order of the varyings which
1546 * means locations are also assigned in this reversed order and happens to
1547 * be what we want. This is also whats happening in
1548 * varying_matches::match_comparator().
1555 * Is the given variable a varying variable to be counted against the
1556 * limit in ctx->Const.MaxVarying?
1557 * This includes variables such as texcoords, colors and generic
1558 * varyings, but excludes variables such as gl_FrontFacing and gl_FragCoord.
1561 var_counts_against_varying_limit(gl_shader_stage stage
, const ir_variable
*var
)
1563 /* Only fragment shaders will take a varying variable as an input */
1564 if (stage
== MESA_SHADER_FRAGMENT
&&
1565 var
->data
.mode
== ir_var_shader_in
) {
1566 switch (var
->data
.location
) {
1567 case VARYING_SLOT_POS
:
1568 case VARYING_SLOT_FACE
:
1569 case VARYING_SLOT_PNTC
:
1580 * Visitor class that generates tfeedback_candidate structs describing all
1581 * possible targets of transform feedback.
1583 * tfeedback_candidate structs are stored in the hash table
1584 * tfeedback_candidates, which is passed to the constructor. This hash table
1585 * maps varying names to instances of the tfeedback_candidate struct.
1587 class tfeedback_candidate_generator
: public program_resource_visitor
1590 tfeedback_candidate_generator(void *mem_ctx
,
1591 hash_table
*tfeedback_candidates
)
1593 tfeedback_candidates(tfeedback_candidates
),
1599 void process(ir_variable
*var
)
1601 /* All named varying interface blocks should be flattened by now */
1602 assert(!var
->is_interface_instance());
1604 this->toplevel_var
= var
;
1605 this->varying_floats
= 0;
1606 program_resource_visitor::process(var
);
1610 virtual void visit_field(const glsl_type
*type
, const char *name
,
1613 assert(!type
->without_array()->is_record());
1614 assert(!type
->without_array()->is_interface());
1618 tfeedback_candidate
*candidate
1619 = rzalloc(this->mem_ctx
, tfeedback_candidate
);
1620 candidate
->toplevel_var
= this->toplevel_var
;
1621 candidate
->type
= type
;
1622 candidate
->offset
= this->varying_floats
;
1623 hash_table_insert(this->tfeedback_candidates
, candidate
,
1624 ralloc_strdup(this->mem_ctx
, name
));
1625 this->varying_floats
+= type
->component_slots();
1629 * Memory context used to allocate hash table keys and values.
1631 void * const mem_ctx
;
1634 * Hash table in which tfeedback_candidate objects should be stored.
1636 hash_table
* const tfeedback_candidates
;
1639 * Pointer to the toplevel variable that is being traversed.
1641 ir_variable
*toplevel_var
;
1644 * Total number of varying floats that have been visited so far. This is
1645 * used to determine the offset to each varying within the toplevel
1648 unsigned varying_floats
;
1655 populate_consumer_input_sets(void *mem_ctx
, exec_list
*ir
,
1656 hash_table
*consumer_inputs
,
1657 hash_table
*consumer_interface_inputs
,
1658 ir_variable
*consumer_inputs_with_locations
[VARYING_SLOT_TESS_MAX
])
1660 memset(consumer_inputs_with_locations
,
1662 sizeof(consumer_inputs_with_locations
[0]) * VARYING_SLOT_TESS_MAX
);
1664 foreach_in_list(ir_instruction
, node
, ir
) {
1665 ir_variable
*const input_var
= node
->as_variable();
1667 if ((input_var
!= NULL
) && (input_var
->data
.mode
== ir_var_shader_in
)) {
1668 /* All interface blocks should have been lowered by this point */
1669 assert(!input_var
->type
->is_interface());
1671 if (input_var
->data
.explicit_location
) {
1672 /* assign_varying_locations only cares about finding the
1673 * ir_variable at the start of a contiguous location block.
1675 * - For !producer, consumer_inputs_with_locations isn't used.
1677 * - For !consumer, consumer_inputs_with_locations is empty.
1679 * For consumer && producer, if you were trying to set some
1680 * ir_variable to the middle of a location block on the other side
1681 * of producer/consumer, cross_validate_outputs_to_inputs() should
1682 * be link-erroring due to either type mismatch or location
1683 * overlaps. If the variables do match up, then they've got a
1684 * matching data.location and you only looked at
1685 * consumer_inputs_with_locations[var->data.location], not any
1686 * following entries for the array/structure.
1688 consumer_inputs_with_locations
[input_var
->data
.location
] =
1690 } else if (input_var
->get_interface_type() != NULL
) {
1691 char *const iface_field_name
=
1692 ralloc_asprintf(mem_ctx
, "%s.%s",
1693 input_var
->get_interface_type()->without_array()->name
,
1695 hash_table_insert(consumer_interface_inputs
, input_var
,
1698 hash_table_insert(consumer_inputs
, input_var
,
1699 ralloc_strdup(mem_ctx
, input_var
->name
));
1706 * Find a variable from the consumer that "matches" the specified variable
1708 * This function only finds inputs with names that match. There is no
1709 * validation (here) that the types, etc. are compatible.
1712 get_matching_input(void *mem_ctx
,
1713 const ir_variable
*output_var
,
1714 hash_table
*consumer_inputs
,
1715 hash_table
*consumer_interface_inputs
,
1716 ir_variable
*consumer_inputs_with_locations
[VARYING_SLOT_TESS_MAX
])
1718 ir_variable
*input_var
;
1720 if (output_var
->data
.explicit_location
) {
1721 input_var
= consumer_inputs_with_locations
[output_var
->data
.location
];
1722 } else if (output_var
->get_interface_type() != NULL
) {
1723 char *const iface_field_name
=
1724 ralloc_asprintf(mem_ctx
, "%s.%s",
1725 output_var
->get_interface_type()->without_array()->name
,
1728 (ir_variable
*) hash_table_find(consumer_interface_inputs
,
1732 (ir_variable
*) hash_table_find(consumer_inputs
, output_var
->name
);
1735 return (input_var
== NULL
|| input_var
->data
.mode
!= ir_var_shader_in
)
1742 io_variable_cmp(const void *_a
, const void *_b
)
1744 const ir_variable
*const a
= *(const ir_variable
**) _a
;
1745 const ir_variable
*const b
= *(const ir_variable
**) _b
;
1747 if (a
->data
.explicit_location
&& b
->data
.explicit_location
)
1748 return b
->data
.location
- a
->data
.location
;
1750 if (a
->data
.explicit_location
&& !b
->data
.explicit_location
)
1753 if (!a
->data
.explicit_location
&& b
->data
.explicit_location
)
1756 return -strcmp(a
->name
, b
->name
);
1760 * Sort the shader IO variables into canonical order
1763 canonicalize_shader_io(exec_list
*ir
, enum ir_variable_mode io_mode
)
1765 ir_variable
*var_table
[MAX_PROGRAM_OUTPUTS
* 4];
1766 unsigned num_variables
= 0;
1768 foreach_in_list(ir_instruction
, node
, ir
) {
1769 ir_variable
*const var
= node
->as_variable();
1771 if (var
== NULL
|| var
->data
.mode
!= io_mode
)
1774 /* If we have already encountered more I/O variables that could
1775 * successfully link, bail.
1777 if (num_variables
== ARRAY_SIZE(var_table
))
1780 var_table
[num_variables
++] = var
;
1783 if (num_variables
== 0)
1786 /* Sort the list in reverse order (io_variable_cmp handles this). Later
1787 * we're going to push the variables on to the IR list as a stack, so we
1788 * want the last variable (in canonical order) to be first in the list.
1790 qsort(var_table
, num_variables
, sizeof(var_table
[0]), io_variable_cmp
);
1792 /* Remove the variable from it's current location in the IR, and put it at
1795 for (unsigned i
= 0; i
< num_variables
; i
++) {
1796 var_table
[i
]->remove();
1797 ir
->push_head(var_table
[i
]);
1802 * Generate a bitfield map of the explicit locations for shader varyings.
1804 * In theory a 32 bits value will be enough but a 64 bits value is future proof.
1807 reserved_varying_slot(struct gl_shader
*stage
, ir_variable_mode io_mode
)
1809 assert(io_mode
== ir_var_shader_in
|| io_mode
== ir_var_shader_out
);
1810 assert(MAX_VARYING
<= 64); /* avoid an overflow of the returned value */
1818 foreach_in_list(ir_instruction
, node
, stage
->ir
) {
1819 ir_variable
*const var
= node
->as_variable();
1821 if (var
== NULL
|| var
->data
.mode
!= io_mode
||
1822 !var
->data
.explicit_location
||
1823 var
->data
.location
< VARYING_SLOT_VAR0
)
1826 var_slot
= var
->data
.location
- VARYING_SLOT_VAR0
;
1828 unsigned num_elements
= get_varying_type(var
, stage
->Stage
)
1829 ->count_attribute_slots(stage
->Stage
== MESA_SHADER_VERTEX
);
1830 for (unsigned i
= 0; i
< num_elements
; i
++) {
1831 if (var_slot
>= 0 && var_slot
< MAX_VARYING
)
1832 slots
|= UINT64_C(1) << var_slot
;
1842 * Assign locations for all variables that are produced in one pipeline stage
1843 * (the "producer") and consumed in the next stage (the "consumer").
1845 * Variables produced by the producer may also be consumed by transform
1848 * \param num_tfeedback_decls is the number of declarations indicating
1849 * variables that may be consumed by transform feedback.
1851 * \param tfeedback_decls is a pointer to an array of tfeedback_decl objects
1852 * representing the result of parsing the strings passed to
1853 * glTransformFeedbackVaryings(). assign_location() will be called for
1854 * each of these objects that matches one of the outputs of the
1857 * When num_tfeedback_decls is nonzero, it is permissible for the consumer to
1858 * be NULL. In this case, varying locations are assigned solely based on the
1859 * requirements of transform feedback.
1862 assign_varying_locations(struct gl_context
*ctx
,
1864 struct gl_shader_program
*prog
,
1865 gl_shader
*producer
, gl_shader
*consumer
,
1866 unsigned num_tfeedback_decls
,
1867 tfeedback_decl
*tfeedback_decls
)
1869 /* Tessellation shaders treat inputs and outputs as shared memory and can
1870 * access inputs and outputs of other invocations.
1871 * Therefore, they can't be lowered to temps easily (and definitely not
1874 bool unpackable_tess
=
1875 (consumer
&& consumer
->Stage
== MESA_SHADER_TESS_EVAL
) ||
1876 (consumer
&& consumer
->Stage
== MESA_SHADER_TESS_CTRL
) ||
1877 (producer
&& producer
->Stage
== MESA_SHADER_TESS_CTRL
);
1879 /* Transform feedback code assumes varying arrays are packed, so if the
1880 * driver has disabled varying packing, make sure to at least enable
1881 * packing required by transform feedback.
1884 ctx
->Extensions
.EXT_transform_feedback
&& !unpackable_tess
;
1886 /* Disable varying packing for GL 4.4+ as there is no guarantee
1887 * that interpolation qualifiers will match between shaders in these
1888 * versions. We also disable packing on outerward facing interfaces for
1889 * SSO because in ES we need to retain the unpacked varying information
1890 * for draw time validation. For desktop GL we could allow packing for
1891 * versions < 4.4 but its just safer not to do packing.
1893 * Packing is still enabled on individual arrays, structs, and matrices as
1894 * these are required by the transform feedback code and it is still safe
1895 * to do so. We also enable packing when a varying is only used for
1896 * transform feedback and its not a SSO.
1898 * Varying packing currently only packs together varyings with matching
1899 * interpolation qualifiers as the backends assume all packed components
1900 * are to be processed in the same way. Therefore we cannot do packing in
1901 * these versions of GL without the risk of mismatching interfaces.
1903 * From Section 4.5 (Interpolation Qualifiers) of the GLSL 4.30 spec:
1905 * "The type and presence of interpolation qualifiers of variables with
1906 * the same name declared in all linked shaders for the same cross-stage
1907 * interface must match, otherwise the link command will fail.
1909 * When comparing an output from one stage to an input of a subsequent
1910 * stage, the input and output don't match if their interpolation
1911 * qualifiers (or lack thereof) are not the same."
1913 * This text was also in at least revison 7 of the 4.40 spec but is no
1914 * longer in revision 9 and not in the 4.50 spec.
1916 bool disable_varying_packing
=
1917 ctx
->Const
.DisableVaryingPacking
|| unpackable_tess
;
1918 if ((ctx
->API
== API_OPENGL_CORE
&& ctx
->Version
>= 44) ||
1919 (prog
->SeparateShader
&& (producer
== NULL
|| consumer
== NULL
)))
1920 disable_varying_packing
= true;
1922 varying_matches
matches(disable_varying_packing
, xfb_enabled
,
1923 producer
? producer
->Stage
: (gl_shader_stage
)-1,
1924 consumer
? consumer
->Stage
: (gl_shader_stage
)-1);
1925 hash_table
*tfeedback_candidates
1926 = hash_table_ctor(0, hash_table_string_hash
, hash_table_string_compare
);
1927 hash_table
*consumer_inputs
1928 = hash_table_ctor(0, hash_table_string_hash
, hash_table_string_compare
);
1929 hash_table
*consumer_interface_inputs
1930 = hash_table_ctor(0, hash_table_string_hash
, hash_table_string_compare
);
1931 ir_variable
*consumer_inputs_with_locations
[VARYING_SLOT_TESS_MAX
] = {
1935 unsigned consumer_vertices
= 0;
1936 if (consumer
&& consumer
->Stage
== MESA_SHADER_GEOMETRY
)
1937 consumer_vertices
= prog
->Geom
.VerticesIn
;
1939 /* Operate in a total of four passes.
1941 * 1. Sort inputs / outputs into a canonical order. This is necessary so
1942 * that inputs / outputs of separable shaders will be assigned
1943 * predictable locations regardless of the order in which declarations
1944 * appeared in the shader source.
1946 * 2. Assign locations for any matching inputs and outputs.
1948 * 3. Mark output variables in the producer that do not have locations as
1949 * not being outputs. This lets the optimizer eliminate them.
1951 * 4. Mark input variables in the consumer that do not have locations as
1952 * not being inputs. This lets the optimizer eliminate them.
1955 canonicalize_shader_io(consumer
->ir
, ir_var_shader_in
);
1958 canonicalize_shader_io(producer
->ir
, ir_var_shader_out
);
1961 linker::populate_consumer_input_sets(mem_ctx
, consumer
->ir
,
1963 consumer_interface_inputs
,
1964 consumer_inputs_with_locations
);
1967 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
1968 ir_variable
*const output_var
= node
->as_variable();
1970 if ((output_var
== NULL
) ||
1971 (output_var
->data
.mode
!= ir_var_shader_out
))
1974 /* Only geometry shaders can use non-zero streams */
1975 assert(output_var
->data
.stream
== 0 ||
1976 (output_var
->data
.stream
< MAX_VERTEX_STREAMS
&&
1977 producer
->Stage
== MESA_SHADER_GEOMETRY
));
1979 if (num_tfeedback_decls
> 0) {
1980 tfeedback_candidate_generator
g(mem_ctx
, tfeedback_candidates
);
1981 g
.process(output_var
);
1984 ir_variable
*const input_var
=
1985 linker::get_matching_input(mem_ctx
, output_var
, consumer_inputs
,
1986 consumer_interface_inputs
,
1987 consumer_inputs_with_locations
);
1989 /* If a matching input variable was found, add this ouptut (and the
1990 * input) to the set. If this is a separable program and there is no
1991 * consumer stage, add the output.
1993 * Always add TCS outputs. They are shared by all invocations
1994 * within a patch and can be used as shared memory.
1996 if (input_var
|| (prog
->SeparateShader
&& consumer
== NULL
) ||
1997 producer
->Type
== GL_TESS_CONTROL_SHADER
) {
1998 matches
.record(output_var
, input_var
);
2001 /* Only stream 0 outputs can be consumed in the next stage */
2002 if (input_var
&& output_var
->data
.stream
!= 0) {
2003 linker_error(prog
, "output %s is assigned to stream=%d but "
2004 "is linked to an input, which requires stream=0",
2005 output_var
->name
, output_var
->data
.stream
);
2010 /* If there's no producer stage, then this must be a separable program.
2011 * For example, we may have a program that has just a fragment shader.
2012 * Later this program will be used with some arbitrary vertex (or
2013 * geometry) shader program. This means that locations must be assigned
2014 * for all the inputs.
2016 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
2017 ir_variable
*const input_var
= node
->as_variable();
2019 if ((input_var
== NULL
) ||
2020 (input_var
->data
.mode
!= ir_var_shader_in
))
2023 matches
.record(NULL
, input_var
);
2027 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
2028 if (!tfeedback_decls
[i
].is_varying())
2031 const tfeedback_candidate
*matched_candidate
2032 = tfeedback_decls
[i
].find_candidate(prog
, tfeedback_candidates
);
2034 if (matched_candidate
== NULL
) {
2035 hash_table_dtor(tfeedback_candidates
);
2036 hash_table_dtor(consumer_inputs
);
2037 hash_table_dtor(consumer_interface_inputs
);
2041 if (matched_candidate
->toplevel_var
->data
.is_unmatched_generic_inout
) {
2042 matched_candidate
->toplevel_var
->data
.is_xfb_only
= 1;
2043 matches
.record(matched_candidate
->toplevel_var
, NULL
);
2047 const uint64_t reserved_slots
=
2048 reserved_varying_slot(producer
, ir_var_shader_out
) |
2049 reserved_varying_slot(consumer
, ir_var_shader_in
);
2051 const unsigned slots_used
= matches
.assign_locations(prog
, reserved_slots
,
2052 prog
->SeparateShader
);
2053 matches
.store_locations();
2055 for (unsigned i
= 0; i
< num_tfeedback_decls
; ++i
) {
2056 if (!tfeedback_decls
[i
].is_varying())
2059 if (!tfeedback_decls
[i
].assign_location(ctx
, prog
)) {
2060 hash_table_dtor(tfeedback_candidates
);
2061 hash_table_dtor(consumer_inputs
);
2062 hash_table_dtor(consumer_interface_inputs
);
2067 hash_table_dtor(tfeedback_candidates
);
2068 hash_table_dtor(consumer_inputs
);
2069 hash_table_dtor(consumer_interface_inputs
);
2071 if (consumer
&& producer
) {
2072 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
2073 ir_variable
*const var
= node
->as_variable();
2075 if (var
&& var
->data
.mode
== ir_var_shader_in
&&
2076 var
->data
.is_unmatched_generic_inout
) {
2077 if (!prog
->IsES
&& prog
->Version
<= 120) {
2078 /* On page 25 (page 31 of the PDF) of the GLSL 1.20 spec:
2080 * Only those varying variables used (i.e. read) in
2081 * the fragment shader executable must be written to
2082 * by the vertex shader executable; declaring
2083 * superfluous varying variables in a vertex shader is
2086 * We interpret this text as meaning that the VS must
2087 * write the variable for the FS to read it. See
2088 * "glsl1-varying read but not written" in piglit.
2090 linker_error(prog
, "%s shader varying %s not written "
2092 _mesa_shader_stage_to_string(consumer
->Stage
),
2094 _mesa_shader_stage_to_string(producer
->Stage
));
2096 linker_warning(prog
, "%s shader varying %s not written "
2098 _mesa_shader_stage_to_string(consumer
->Stage
),
2100 _mesa_shader_stage_to_string(producer
->Stage
));
2105 /* Now that validation is done its safe to remove unused varyings. As
2106 * we have both a producer and consumer its safe to remove unused
2107 * varyings even if the program is a SSO because the stages are being
2108 * linked together i.e. we have a multi-stage SSO.
2110 remove_unused_shader_inputs_and_outputs(false, producer
,
2112 remove_unused_shader_inputs_and_outputs(false, consumer
,
2117 lower_packed_varyings(mem_ctx
, slots_used
, ir_var_shader_out
,
2118 0, producer
, disable_varying_packing
,
2123 lower_packed_varyings(mem_ctx
, slots_used
, ir_var_shader_in
,
2124 consumer_vertices
, consumer
,
2125 disable_varying_packing
, xfb_enabled
);
2132 check_against_output_limit(struct gl_context
*ctx
,
2133 struct gl_shader_program
*prog
,
2134 gl_shader
*producer
)
2136 unsigned output_vectors
= 0;
2138 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
2139 ir_variable
*const var
= node
->as_variable();
2141 if (var
&& var
->data
.mode
== ir_var_shader_out
&&
2142 var_counts_against_varying_limit(producer
->Stage
, var
)) {
2143 /* outputs for fragment shader can't be doubles */
2144 output_vectors
+= var
->type
->count_attribute_slots(false);
2148 assert(producer
->Stage
!= MESA_SHADER_FRAGMENT
);
2149 unsigned max_output_components
=
2150 ctx
->Const
.Program
[producer
->Stage
].MaxOutputComponents
;
2152 const unsigned output_components
= output_vectors
* 4;
2153 if (output_components
> max_output_components
) {
2154 if (ctx
->API
== API_OPENGLES2
|| prog
->IsES
)
2155 linker_error(prog
, "%s shader uses too many output vectors "
2157 _mesa_shader_stage_to_string(producer
->Stage
),
2159 max_output_components
/ 4);
2161 linker_error(prog
, "%s shader uses too many output components "
2163 _mesa_shader_stage_to_string(producer
->Stage
),
2165 max_output_components
);
2174 check_against_input_limit(struct gl_context
*ctx
,
2175 struct gl_shader_program
*prog
,
2176 gl_shader
*consumer
)
2178 unsigned input_vectors
= 0;
2180 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
2181 ir_variable
*const var
= node
->as_variable();
2183 if (var
&& var
->data
.mode
== ir_var_shader_in
&&
2184 var_counts_against_varying_limit(consumer
->Stage
, var
)) {
2185 /* vertex inputs aren't varying counted */
2186 input_vectors
+= var
->type
->count_attribute_slots(false);
2190 assert(consumer
->Stage
!= MESA_SHADER_VERTEX
);
2191 unsigned max_input_components
=
2192 ctx
->Const
.Program
[consumer
->Stage
].MaxInputComponents
;
2194 const unsigned input_components
= input_vectors
* 4;
2195 if (input_components
> max_input_components
) {
2196 if (ctx
->API
== API_OPENGLES2
|| prog
->IsES
)
2197 linker_error(prog
, "%s shader uses too many input vectors "
2199 _mesa_shader_stage_to_string(consumer
->Stage
),
2201 max_input_components
/ 4);
2203 linker_error(prog
, "%s shader uses too many input components "
2205 _mesa_shader_stage_to_string(consumer
->Stage
),
2207 max_input_components
);