2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * GLSL linker implementation
28 * Given a set of shaders that are to be linked to generate a final program,
29 * there are three distinct stages.
31 * In the first stage shaders are partitioned into groups based on the shader
32 * type. All shaders of a particular type (e.g., vertex shaders) are linked
35 * - Undefined references in each shader are resolve to definitions in
37 * - Types and qualifiers of uniforms, outputs, and global variables defined
38 * in multiple shaders with the same name are verified to be the same.
39 * - Initializers for uniforms and global variables defined
40 * in multiple shaders with the same name are verified to be the same.
42 * The result, in the terminology of the GLSL spec, is a set of shader
43 * executables for each processing unit.
45 * After the first stage is complete, a series of semantic checks are performed
46 * on each of the shader executables.
48 * - Each shader executable must define a \c main function.
49 * - Each vertex shader executable must write to \c gl_Position.
50 * - Each fragment shader executable must write to either \c gl_FragData or
53 * In the final stage individual shader executables are linked to create a
54 * complete exectuable.
56 * - Types of uniforms defined in multiple shader stages with the same name
57 * are verified to be the same.
58 * - Initializers for uniforms defined in multiple shader stages with the
59 * same name are verified to be the same.
60 * - Types and qualifiers of outputs defined in one stage are verified to
61 * be the same as the types and qualifiers of inputs defined with the same
62 * name in a later stage.
64 * \author Ian Romanick <ian.d.romanick@intel.com>
68 #include "util/strndup.h"
69 #include "main/core.h"
70 #include "glsl_symbol_table.h"
71 #include "glsl_parser_extras.h"
74 #include "program/prog_instruction.h"
75 #include "program/program.h"
76 #include "util/mesa-sha1.h"
78 #include "string_to_uint_map.h"
80 #include "link_varyings.h"
81 #include "ir_optimization.h"
82 #include "ir_rvalue_visitor.h"
83 #include "ir_uniform.h"
84 #include "builtin_functions.h"
85 #include "shader_cache.h"
87 #include "main/shaderobj.h"
88 #include "main/enums.h"
93 struct find_variable
{
97 find_variable(const char *name
) : name(name
), found(false) {}
101 * Visitor that determines whether or not a variable is ever written.
103 * Use \ref find_assignments for convenience.
105 class find_assignment_visitor
: public ir_hierarchical_visitor
{
107 find_assignment_visitor(unsigned num_vars
,
108 find_variable
* const *vars
)
109 : num_variables(num_vars
), num_found(0), variables(vars
)
113 virtual ir_visitor_status
visit_enter(ir_assignment
*ir
)
115 ir_variable
*const var
= ir
->lhs
->variable_referenced();
117 return check_variable_name(var
->name
);
120 virtual ir_visitor_status
visit_enter(ir_call
*ir
)
122 foreach_two_lists(formal_node
, &ir
->callee
->parameters
,
123 actual_node
, &ir
->actual_parameters
) {
124 ir_rvalue
*param_rval
= (ir_rvalue
*) actual_node
;
125 ir_variable
*sig_param
= (ir_variable
*) formal_node
;
127 if (sig_param
->data
.mode
== ir_var_function_out
||
128 sig_param
->data
.mode
== ir_var_function_inout
) {
129 ir_variable
*var
= param_rval
->variable_referenced();
130 if (var
&& check_variable_name(var
->name
) == visit_stop
)
135 if (ir
->return_deref
!= NULL
) {
136 ir_variable
*const var
= ir
->return_deref
->variable_referenced();
138 if (check_variable_name(var
->name
) == visit_stop
)
142 return visit_continue_with_parent
;
146 ir_visitor_status
check_variable_name(const char *name
)
148 for (unsigned i
= 0; i
< num_variables
; ++i
) {
149 if (strcmp(variables
[i
]->name
, name
) == 0) {
150 if (!variables
[i
]->found
) {
151 variables
[i
]->found
= true;
153 assert(num_found
< num_variables
);
154 if (++num_found
== num_variables
)
161 return visit_continue_with_parent
;
165 unsigned num_variables
; /**< Number of variables to find */
166 unsigned num_found
; /**< Number of variables already found */
167 find_variable
* const *variables
; /**< Variables to find */
171 * Determine whether or not any of NULL-terminated list of variables is ever
175 find_assignments(exec_list
*ir
, find_variable
* const *vars
)
177 unsigned num_variables
= 0;
179 for (find_variable
* const *v
= vars
; *v
; ++v
)
182 find_assignment_visitor
visitor(num_variables
, vars
);
187 * Determine whether or not the given variable is ever written to.
190 find_assignments(exec_list
*ir
, find_variable
*var
)
192 find_assignment_visitor
visitor(1, &var
);
197 * Visitor that determines whether or not a variable is ever read.
199 class find_deref_visitor
: public ir_hierarchical_visitor
{
201 find_deref_visitor(const char *name
)
202 : name(name
), found(false)
207 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
209 if (strcmp(this->name
, ir
->var
->name
) == 0) {
214 return visit_continue
;
217 bool variable_found() const
223 const char *name
; /**< Find writes to a variable with this name. */
224 bool found
; /**< Was a write to the variable found? */
229 * A visitor helper that provides methods for updating the types of
230 * ir_dereferences. Classes that update variable types (say, updating
231 * array sizes) will want to use this so that dereference types stay in sync.
233 class deref_type_updater
: public ir_hierarchical_visitor
{
235 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
237 ir
->type
= ir
->var
->type
;
238 return visit_continue
;
241 virtual ir_visitor_status
visit_leave(ir_dereference_array
*ir
)
243 const glsl_type
*const vt
= ir
->array
->type
;
245 ir
->type
= vt
->fields
.array
;
246 return visit_continue
;
249 virtual ir_visitor_status
visit_leave(ir_dereference_record
*ir
)
251 ir
->type
= ir
->record
->type
->fields
.structure
[ir
->field_idx
].type
;
252 return visit_continue
;
257 class array_resize_visitor
: public deref_type_updater
{
259 unsigned num_vertices
;
260 gl_shader_program
*prog
;
261 gl_shader_stage stage
;
263 array_resize_visitor(unsigned num_vertices
,
264 gl_shader_program
*prog
,
265 gl_shader_stage stage
)
267 this->num_vertices
= num_vertices
;
272 virtual ~array_resize_visitor()
277 virtual ir_visitor_status
visit(ir_variable
*var
)
279 if (!var
->type
->is_array() || var
->data
.mode
!= ir_var_shader_in
||
281 return visit_continue
;
283 unsigned size
= var
->type
->length
;
285 if (stage
== MESA_SHADER_GEOMETRY
) {
286 /* Generate a link error if the shader has declared this array with
289 if (!var
->data
.implicit_sized_array
&&
290 size
&& size
!= this->num_vertices
) {
291 linker_error(this->prog
, "size of array %s declared as %u, "
292 "but number of input vertices is %u\n",
293 var
->name
, size
, this->num_vertices
);
294 return visit_continue
;
297 /* Generate a link error if the shader attempts to access an input
298 * array using an index too large for its actual size assigned at
301 if (var
->data
.max_array_access
>= (int)this->num_vertices
) {
302 linker_error(this->prog
, "%s shader accesses element %i of "
303 "%s, but only %i input vertices\n",
304 _mesa_shader_stage_to_string(this->stage
),
305 var
->data
.max_array_access
, var
->name
, this->num_vertices
);
306 return visit_continue
;
310 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
312 var
->data
.max_array_access
= this->num_vertices
- 1;
314 return visit_continue
;
319 * Visitor that determines the highest stream id to which a (geometry) shader
320 * emits vertices. It also checks whether End{Stream}Primitive is ever called.
322 class find_emit_vertex_visitor
: public ir_hierarchical_visitor
{
324 find_emit_vertex_visitor(int max_allowed
)
325 : max_stream_allowed(max_allowed
),
326 invalid_stream_id(0),
327 invalid_stream_id_from_emit_vertex(false),
328 end_primitive_found(false),
329 uses_non_zero_stream(false)
334 virtual ir_visitor_status
visit_leave(ir_emit_vertex
*ir
)
336 int stream_id
= ir
->stream_id();
339 invalid_stream_id
= stream_id
;
340 invalid_stream_id_from_emit_vertex
= true;
344 if (stream_id
> max_stream_allowed
) {
345 invalid_stream_id
= stream_id
;
346 invalid_stream_id_from_emit_vertex
= true;
351 uses_non_zero_stream
= true;
353 return visit_continue
;
356 virtual ir_visitor_status
visit_leave(ir_end_primitive
*ir
)
358 end_primitive_found
= true;
360 int stream_id
= ir
->stream_id();
363 invalid_stream_id
= stream_id
;
364 invalid_stream_id_from_emit_vertex
= false;
368 if (stream_id
> max_stream_allowed
) {
369 invalid_stream_id
= stream_id
;
370 invalid_stream_id_from_emit_vertex
= false;
375 uses_non_zero_stream
= true;
377 return visit_continue
;
382 return invalid_stream_id
!= 0;
385 const char *error_func()
387 return invalid_stream_id_from_emit_vertex
?
388 "EmitStreamVertex" : "EndStreamPrimitive";
393 return invalid_stream_id
;
398 return uses_non_zero_stream
;
401 bool uses_end_primitive()
403 return end_primitive_found
;
407 int max_stream_allowed
;
408 int invalid_stream_id
;
409 bool invalid_stream_id_from_emit_vertex
;
410 bool end_primitive_found
;
411 bool uses_non_zero_stream
;
414 /* Class that finds array derefs and check if indexes are dynamic. */
415 class dynamic_sampler_array_indexing_visitor
: public ir_hierarchical_visitor
418 dynamic_sampler_array_indexing_visitor() :
419 dynamic_sampler_array_indexing(false)
423 ir_visitor_status
visit_enter(ir_dereference_array
*ir
)
425 if (!ir
->variable_referenced())
426 return visit_continue
;
428 if (!ir
->variable_referenced()->type
->contains_sampler())
429 return visit_continue
;
431 if (!ir
->array_index
->constant_expression_value(ralloc_parent(ir
))) {
432 dynamic_sampler_array_indexing
= true;
435 return visit_continue
;
438 bool uses_dynamic_sampler_array_indexing()
440 return dynamic_sampler_array_indexing
;
444 bool dynamic_sampler_array_indexing
;
447 } /* anonymous namespace */
450 linker_error(gl_shader_program
*prog
, const char *fmt
, ...)
454 ralloc_strcat(&prog
->data
->InfoLog
, "error: ");
456 ralloc_vasprintf_append(&prog
->data
->InfoLog
, fmt
, ap
);
459 prog
->data
->LinkStatus
= linking_failure
;
464 linker_warning(gl_shader_program
*prog
, const char *fmt
, ...)
468 ralloc_strcat(&prog
->data
->InfoLog
, "warning: ");
470 ralloc_vasprintf_append(&prog
->data
->InfoLog
, fmt
, ap
);
477 * Given a string identifying a program resource, break it into a base name
478 * and an optional array index in square brackets.
480 * If an array index is present, \c out_base_name_end is set to point to the
481 * "[" that precedes the array index, and the array index itself is returned
484 * If no array index is present (or if the array index is negative or
485 * mal-formed), \c out_base_name_end, is set to point to the null terminator
486 * at the end of the input string, and -1 is returned.
488 * Only the final array index is parsed; if the string contains other array
489 * indices (or structure field accesses), they are left in the base name.
491 * No attempt is made to check that the base name is properly formed;
492 * typically the caller will look up the base name in a hash table, so
493 * ill-formed base names simply turn into hash table lookup failures.
496 parse_program_resource_name(const GLchar
*name
,
497 const GLchar
**out_base_name_end
)
499 /* Section 7.3.1 ("Program Interfaces") of the OpenGL 4.3 spec says:
501 * "When an integer array element or block instance number is part of
502 * the name string, it will be specified in decimal form without a "+"
503 * or "-" sign or any extra leading zeroes. Additionally, the name
504 * string will not include white space anywhere in the string."
507 const size_t len
= strlen(name
);
508 *out_base_name_end
= name
+ len
;
510 if (len
== 0 || name
[len
-1] != ']')
513 /* Walk backwards over the string looking for a non-digit character. This
514 * had better be the opening bracket for an array index.
516 * Initially, i specifies the location of the ']'. Since the string may
517 * contain only the ']' charcater, walk backwards very carefully.
520 for (i
= len
- 1; (i
> 0) && isdigit(name
[i
-1]); --i
)
523 if ((i
== 0) || name
[i
-1] != '[')
526 long array_index
= strtol(&name
[i
], NULL
, 10);
530 /* Check for leading zero */
531 if (name
[i
] == '0' && name
[i
+1] != ']')
534 *out_base_name_end
= name
+ (i
- 1);
540 link_invalidate_variable_locations(exec_list
*ir
)
542 foreach_in_list(ir_instruction
, node
, ir
) {
543 ir_variable
*const var
= node
->as_variable();
548 /* Only assign locations for variables that lack an explicit location.
549 * Explicit locations are set for all built-in variables, generic vertex
550 * shader inputs (via layout(location=...)), and generic fragment shader
551 * outputs (also via layout(location=...)).
553 if (!var
->data
.explicit_location
) {
554 var
->data
.location
= -1;
555 var
->data
.location_frac
= 0;
558 /* ir_variable::is_unmatched_generic_inout is used by the linker while
559 * connecting outputs from one stage to inputs of the next stage.
561 if (var
->data
.explicit_location
&&
562 var
->data
.location
< VARYING_SLOT_VAR0
) {
563 var
->data
.is_unmatched_generic_inout
= 0;
565 var
->data
.is_unmatched_generic_inout
= 1;
572 * Set clip_distance_array_size based and cull_distance_array_size on the given
575 * Also check for errors based on incorrect usage of gl_ClipVertex and
576 * gl_ClipDistance and gl_CullDistance.
577 * Additionally test whether the arrays gl_ClipDistance and gl_CullDistance
578 * exceed the maximum size defined by gl_MaxCombinedClipAndCullDistances.
580 * Return false if an error was reported.
583 analyze_clip_cull_usage(struct gl_shader_program
*prog
,
584 struct gl_linked_shader
*shader
,
585 struct gl_context
*ctx
,
586 GLuint
*clip_distance_array_size
,
587 GLuint
*cull_distance_array_size
)
589 *clip_distance_array_size
= 0;
590 *cull_distance_array_size
= 0;
592 if (prog
->data
->Version
>= (prog
->IsES
? 300 : 130)) {
593 /* From section 7.1 (Vertex Shader Special Variables) of the
596 * "It is an error for a shader to statically write both
597 * gl_ClipVertex and gl_ClipDistance."
599 * This does not apply to GLSL ES shaders, since GLSL ES defines neither
600 * gl_ClipVertex nor gl_ClipDistance. However with
601 * GL_EXT_clip_cull_distance, this functionality is exposed in ES 3.0.
603 find_variable
gl_ClipDistance("gl_ClipDistance");
604 find_variable
gl_CullDistance("gl_CullDistance");
605 find_variable
gl_ClipVertex("gl_ClipVertex");
606 find_variable
* const variables
[] = {
609 !prog
->IsES
? &gl_ClipVertex
: NULL
,
612 find_assignments(shader
->ir
, variables
);
614 /* From the ARB_cull_distance spec:
616 * It is a compile-time or link-time error for the set of shaders forming
617 * a program to statically read or write both gl_ClipVertex and either
618 * gl_ClipDistance or gl_CullDistance.
620 * This does not apply to GLSL ES shaders, since GLSL ES doesn't define
624 if (gl_ClipVertex
.found
&& gl_ClipDistance
.found
) {
625 linker_error(prog
, "%s shader writes to both `gl_ClipVertex' "
626 "and `gl_ClipDistance'\n",
627 _mesa_shader_stage_to_string(shader
->Stage
));
630 if (gl_ClipVertex
.found
&& gl_CullDistance
.found
) {
631 linker_error(prog
, "%s shader writes to both `gl_ClipVertex' "
632 "and `gl_CullDistance'\n",
633 _mesa_shader_stage_to_string(shader
->Stage
));
638 if (gl_ClipDistance
.found
) {
639 ir_variable
*clip_distance_var
=
640 shader
->symbols
->get_variable("gl_ClipDistance");
641 assert(clip_distance_var
);
642 *clip_distance_array_size
= clip_distance_var
->type
->length
;
644 if (gl_CullDistance
.found
) {
645 ir_variable
*cull_distance_var
=
646 shader
->symbols
->get_variable("gl_CullDistance");
647 assert(cull_distance_var
);
648 *cull_distance_array_size
= cull_distance_var
->type
->length
;
650 /* From the ARB_cull_distance spec:
652 * It is a compile-time or link-time error for the set of shaders forming
653 * a program to have the sum of the sizes of the gl_ClipDistance and
654 * gl_CullDistance arrays to be larger than
655 * gl_MaxCombinedClipAndCullDistances.
657 if ((*clip_distance_array_size
+ *cull_distance_array_size
) >
658 ctx
->Const
.MaxClipPlanes
) {
659 linker_error(prog
, "%s shader: the combined size of "
660 "'gl_ClipDistance' and 'gl_CullDistance' size cannot "
662 "gl_MaxCombinedClipAndCullDistances (%u)",
663 _mesa_shader_stage_to_string(shader
->Stage
),
664 ctx
->Const
.MaxClipPlanes
);
671 * Verify that a vertex shader executable meets all semantic requirements.
673 * Also sets info.clip_distance_array_size and
674 * info.cull_distance_array_size as a side effect.
676 * \param shader Vertex shader executable to be verified
679 validate_vertex_shader_executable(struct gl_shader_program
*prog
,
680 struct gl_linked_shader
*shader
,
681 struct gl_context
*ctx
)
686 /* From the GLSL 1.10 spec, page 48:
688 * "The variable gl_Position is available only in the vertex
689 * language and is intended for writing the homogeneous vertex
690 * position. All executions of a well-formed vertex shader
691 * executable must write a value into this variable. [...] The
692 * variable gl_Position is available only in the vertex
693 * language and is intended for writing the homogeneous vertex
694 * position. All executions of a well-formed vertex shader
695 * executable must write a value into this variable."
697 * while in GLSL 1.40 this text is changed to:
699 * "The variable gl_Position is available only in the vertex
700 * language and is intended for writing the homogeneous vertex
701 * position. It can be written at any time during shader
702 * execution. It may also be read back by a vertex shader
703 * after being written. This value will be used by primitive
704 * assembly, clipping, culling, and other fixed functionality
705 * operations, if present, that operate on primitives after
706 * vertex processing has occurred. Its value is undefined if
707 * the vertex shader executable does not write gl_Position."
709 * All GLSL ES Versions are similar to GLSL 1.40--failing to write to
710 * gl_Position is not an error.
712 if (prog
->data
->Version
< (prog
->IsES
? 300 : 140)) {
713 find_variable
gl_Position("gl_Position");
714 find_assignments(shader
->ir
, &gl_Position
);
715 if (!gl_Position
.found
) {
718 "vertex shader does not write to `gl_Position'. "
719 "Its value is undefined. \n");
722 "vertex shader does not write to `gl_Position'. \n");
728 analyze_clip_cull_usage(prog
, shader
, ctx
,
729 &shader
->Program
->info
.clip_distance_array_size
,
730 &shader
->Program
->info
.cull_distance_array_size
);
734 validate_tess_eval_shader_executable(struct gl_shader_program
*prog
,
735 struct gl_linked_shader
*shader
,
736 struct gl_context
*ctx
)
741 analyze_clip_cull_usage(prog
, shader
, ctx
,
742 &shader
->Program
->info
.clip_distance_array_size
,
743 &shader
->Program
->info
.cull_distance_array_size
);
748 * Verify that a fragment shader executable meets all semantic requirements
750 * \param shader Fragment shader executable to be verified
753 validate_fragment_shader_executable(struct gl_shader_program
*prog
,
754 struct gl_linked_shader
*shader
)
759 find_variable
gl_FragColor("gl_FragColor");
760 find_variable
gl_FragData("gl_FragData");
761 find_variable
* const variables
[] = { &gl_FragColor
, &gl_FragData
, NULL
};
762 find_assignments(shader
->ir
, variables
);
764 if (gl_FragColor
.found
&& gl_FragData
.found
) {
765 linker_error(prog
, "fragment shader writes to both "
766 "`gl_FragColor' and `gl_FragData'\n");
771 * Verify that a geometry shader executable meets all semantic requirements
773 * Also sets prog->Geom.VerticesIn, and info.clip_distance_array_sizeand
774 * info.cull_distance_array_size as a side effect.
776 * \param shader Geometry shader executable to be verified
779 validate_geometry_shader_executable(struct gl_shader_program
*prog
,
780 struct gl_linked_shader
*shader
,
781 struct gl_context
*ctx
)
786 unsigned num_vertices
=
787 vertices_per_prim(shader
->Program
->info
.gs
.input_primitive
);
788 prog
->Geom
.VerticesIn
= num_vertices
;
790 analyze_clip_cull_usage(prog
, shader
, ctx
,
791 &shader
->Program
->info
.clip_distance_array_size
,
792 &shader
->Program
->info
.cull_distance_array_size
);
796 * Check if geometry shaders emit to non-zero streams and do corresponding
800 validate_geometry_shader_emissions(struct gl_context
*ctx
,
801 struct gl_shader_program
*prog
)
803 struct gl_linked_shader
*sh
= prog
->_LinkedShaders
[MESA_SHADER_GEOMETRY
];
806 find_emit_vertex_visitor
emit_vertex(ctx
->Const
.MaxVertexStreams
- 1);
807 emit_vertex
.run(sh
->ir
);
808 if (emit_vertex
.error()) {
809 linker_error(prog
, "Invalid call %s(%d). Accepted values for the "
810 "stream parameter are in the range [0, %d].\n",
811 emit_vertex
.error_func(),
812 emit_vertex
.error_stream(),
813 ctx
->Const
.MaxVertexStreams
- 1);
815 prog
->Geom
.UsesStreams
= emit_vertex
.uses_streams();
816 prog
->Geom
.UsesEndPrimitive
= emit_vertex
.uses_end_primitive();
818 /* From the ARB_gpu_shader5 spec:
820 * "Multiple vertex streams are supported only if the output primitive
821 * type is declared to be "points". A program will fail to link if it
822 * contains a geometry shader calling EmitStreamVertex() or
823 * EndStreamPrimitive() if its output primitive type is not "points".
825 * However, in the same spec:
827 * "The function EmitVertex() is equivalent to calling EmitStreamVertex()
828 * with <stream> set to zero."
832 * "The function EndPrimitive() is equivalent to calling
833 * EndStreamPrimitive() with <stream> set to zero."
835 * Since we can call EmitVertex() and EndPrimitive() when we output
836 * primitives other than points, calling EmitStreamVertex(0) or
837 * EmitEndPrimitive(0) should not produce errors. This it also what Nvidia
838 * does. Currently we only set prog->Geom.UsesStreams to TRUE when
839 * EmitStreamVertex() or EmitEndPrimitive() are called with a non-zero
842 if (prog
->Geom
.UsesStreams
&&
843 sh
->Program
->info
.gs
.output_primitive
!= GL_POINTS
) {
844 linker_error(prog
, "EmitStreamVertex(n) and EndStreamPrimitive(n) "
845 "with n>0 requires point output\n");
851 validate_intrastage_arrays(struct gl_shader_program
*prog
,
852 ir_variable
*const var
,
853 ir_variable
*const existing
)
855 /* Consider the types to be "the same" if both types are arrays
856 * of the same type and one of the arrays is implicitly sized.
857 * In addition, set the type of the linked variable to the
858 * explicitly sized array.
860 if (var
->type
->is_array() && existing
->type
->is_array()) {
861 if ((var
->type
->fields
.array
== existing
->type
->fields
.array
) &&
862 ((var
->type
->length
== 0)|| (existing
->type
->length
== 0))) {
863 if (var
->type
->length
!= 0) {
864 if ((int)var
->type
->length
<= existing
->data
.max_array_access
) {
865 linker_error(prog
, "%s `%s' declared as type "
866 "`%s' but outermost dimension has an index"
869 var
->name
, var
->type
->name
,
870 existing
->data
.max_array_access
);
872 existing
->type
= var
->type
;
874 } else if (existing
->type
->length
!= 0) {
875 if((int)existing
->type
->length
<= var
->data
.max_array_access
&&
876 !existing
->data
.from_ssbo_unsized_array
) {
877 linker_error(prog
, "%s `%s' declared as type "
878 "`%s' but outermost dimension has an index"
881 var
->name
, existing
->type
->name
,
882 var
->data
.max_array_access
);
893 * Perform validation of global variables used across multiple shaders
896 cross_validate_globals(struct gl_shader_program
*prog
,
897 struct exec_list
*ir
, glsl_symbol_table
*variables
,
900 foreach_in_list(ir_instruction
, node
, ir
) {
901 ir_variable
*const var
= node
->as_variable();
906 if (uniforms_only
&& (var
->data
.mode
!= ir_var_uniform
&& var
->data
.mode
!= ir_var_shader_storage
))
909 /* don't cross validate subroutine uniforms */
910 if (var
->type
->contains_subroutine())
913 /* Don't cross validate interface instances. These are only relevant
914 * inside a shader. The cross validation is done at the Interface Block
917 if (var
->is_interface_instance())
920 /* Don't cross validate temporaries that are at global scope. These
921 * will eventually get pulled into the shaders 'main'.
923 if (var
->data
.mode
== ir_var_temporary
)
926 /* If a global with this name has already been seen, verify that the
927 * new instance has the same type. In addition, if the globals have
928 * initializers, the values of the initializers must be the same.
930 ir_variable
*const existing
= variables
->get_variable(var
->name
);
931 if (existing
!= NULL
) {
932 /* Check if types match. */
933 if (var
->type
!= existing
->type
) {
934 if (!validate_intrastage_arrays(prog
, var
, existing
)) {
935 /* If it is an unsized array in a Shader Storage Block,
936 * two different shaders can access to different elements.
937 * Because of that, they might be converted to different
938 * sized arrays, then check that they are compatible but
939 * ignore the array size.
941 if (!(var
->data
.mode
== ir_var_shader_storage
&&
942 var
->data
.from_ssbo_unsized_array
&&
943 existing
->data
.mode
== ir_var_shader_storage
&&
944 existing
->data
.from_ssbo_unsized_array
&&
945 var
->type
->gl_type
== existing
->type
->gl_type
)) {
946 linker_error(prog
, "%s `%s' declared as type "
947 "`%s' and type `%s'\n",
949 var
->name
, var
->type
->name
,
950 existing
->type
->name
);
956 if (var
->data
.explicit_location
) {
957 if (existing
->data
.explicit_location
958 && (var
->data
.location
!= existing
->data
.location
)) {
959 linker_error(prog
, "explicit locations for %s "
960 "`%s' have differing values\n",
961 mode_string(var
), var
->name
);
965 if (var
->data
.location_frac
!= existing
->data
.location_frac
) {
966 linker_error(prog
, "explicit components for %s `%s' have "
967 "differing values\n", mode_string(var
), var
->name
);
971 existing
->data
.location
= var
->data
.location
;
972 existing
->data
.explicit_location
= true;
974 /* Check if uniform with implicit location was marked explicit
975 * by earlier shader stage. If so, mark it explicit in this stage
976 * too to make sure later processing does not treat it as
979 if (existing
->data
.explicit_location
) {
980 var
->data
.location
= existing
->data
.location
;
981 var
->data
.explicit_location
= true;
985 /* From the GLSL 4.20 specification:
986 * "A link error will result if two compilation units in a program
987 * specify different integer-constant bindings for the same
988 * opaque-uniform name. However, it is not an error to specify a
989 * binding on some but not all declarations for the same name"
991 if (var
->data
.explicit_binding
) {
992 if (existing
->data
.explicit_binding
&&
993 var
->data
.binding
!= existing
->data
.binding
) {
994 linker_error(prog
, "explicit bindings for %s "
995 "`%s' have differing values\n",
996 mode_string(var
), var
->name
);
1000 existing
->data
.binding
= var
->data
.binding
;
1001 existing
->data
.explicit_binding
= true;
1004 if (var
->type
->contains_atomic() &&
1005 var
->data
.offset
!= existing
->data
.offset
) {
1006 linker_error(prog
, "offset specifications for %s "
1007 "`%s' have differing values\n",
1008 mode_string(var
), var
->name
);
1012 /* Validate layout qualifiers for gl_FragDepth.
1014 * From the AMD/ARB_conservative_depth specs:
1016 * "If gl_FragDepth is redeclared in any fragment shader in a
1017 * program, it must be redeclared in all fragment shaders in
1018 * that program that have static assignments to
1019 * gl_FragDepth. All redeclarations of gl_FragDepth in all
1020 * fragment shaders in a single program must have the same set
1023 if (strcmp(var
->name
, "gl_FragDepth") == 0) {
1024 bool layout_declared
= var
->data
.depth_layout
!= ir_depth_layout_none
;
1025 bool layout_differs
=
1026 var
->data
.depth_layout
!= existing
->data
.depth_layout
;
1028 if (layout_declared
&& layout_differs
) {
1030 "All redeclarations of gl_FragDepth in all "
1031 "fragment shaders in a single program must have "
1032 "the same set of qualifiers.\n");
1035 if (var
->data
.used
&& layout_differs
) {
1037 "If gl_FragDepth is redeclared with a layout "
1038 "qualifier in any fragment shader, it must be "
1039 "redeclared with the same layout qualifier in "
1040 "all fragment shaders that have assignments to "
1045 /* Page 35 (page 41 of the PDF) of the GLSL 4.20 spec says:
1047 * "If a shared global has multiple initializers, the
1048 * initializers must all be constant expressions, and they
1049 * must all have the same value. Otherwise, a link error will
1050 * result. (A shared global having only one initializer does
1051 * not require that initializer to be a constant expression.)"
1053 * Previous to 4.20 the GLSL spec simply said that initializers
1054 * must have the same value. In this case of non-constant
1055 * initializers, this was impossible to determine. As a result,
1056 * no vendor actually implemented that behavior. The 4.20
1057 * behavior matches the implemented behavior of at least one other
1058 * vendor, so we'll implement that for all GLSL versions.
1060 if (var
->constant_initializer
!= NULL
) {
1061 if (existing
->constant_initializer
!= NULL
) {
1062 if (!var
->constant_initializer
->has_value(existing
->constant_initializer
)) {
1063 linker_error(prog
, "initializers for %s "
1064 "`%s' have differing values\n",
1065 mode_string(var
), var
->name
);
1069 /* If the first-seen instance of a particular uniform did
1070 * not have an initializer but a later instance does,
1071 * replace the former with the later.
1073 variables
->replace_variable(existing
->name
, var
);
1077 if (var
->data
.has_initializer
) {
1078 if (existing
->data
.has_initializer
1079 && (var
->constant_initializer
== NULL
1080 || existing
->constant_initializer
== NULL
)) {
1082 "shared global variable `%s' has multiple "
1083 "non-constant initializers.\n",
1089 if (existing
->data
.invariant
!= var
->data
.invariant
) {
1090 linker_error(prog
, "declarations for %s `%s' have "
1091 "mismatching invariant qualifiers\n",
1092 mode_string(var
), var
->name
);
1095 if (existing
->data
.centroid
!= var
->data
.centroid
) {
1096 linker_error(prog
, "declarations for %s `%s' have "
1097 "mismatching centroid qualifiers\n",
1098 mode_string(var
), var
->name
);
1101 if (existing
->data
.sample
!= var
->data
.sample
) {
1102 linker_error(prog
, "declarations for %s `%s` have "
1103 "mismatching sample qualifiers\n",
1104 mode_string(var
), var
->name
);
1107 if (existing
->data
.image_format
!= var
->data
.image_format
) {
1108 linker_error(prog
, "declarations for %s `%s` have "
1109 "mismatching image format qualifiers\n",
1110 mode_string(var
), var
->name
);
1114 /* Only in GLSL ES 3.10, the precision qualifier should not match
1115 * between block members defined in matched block names within a
1118 * In GLSL ES 3.00 and ES 3.20, precision qualifier for each block
1119 * member should match.
1121 if (prog
->IsES
&& (prog
->data
->Version
!= 310 ||
1122 !var
->get_interface_type()) &&
1123 existing
->data
.precision
!= var
->data
.precision
) {
1124 linker_error(prog
, "declarations for %s `%s` have "
1125 "mismatching precision qualifiers\n",
1126 mode_string(var
), var
->name
);
1130 variables
->add_variable(var
);
1136 * Perform validation of uniforms used across multiple shader stages
1139 cross_validate_uniforms(struct gl_shader_program
*prog
)
1141 glsl_symbol_table variables
;
1142 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
1143 if (prog
->_LinkedShaders
[i
] == NULL
)
1146 cross_validate_globals(prog
, prog
->_LinkedShaders
[i
]->ir
, &variables
,
1152 * Accumulates the array of buffer blocks and checks that all definitions of
1153 * blocks agree on their contents.
1156 interstage_cross_validate_uniform_blocks(struct gl_shader_program
*prog
,
1159 int *InterfaceBlockStageIndex
[MESA_SHADER_STAGES
];
1160 struct gl_uniform_block
*blks
= NULL
;
1161 unsigned *num_blks
= validate_ssbo
? &prog
->data
->NumShaderStorageBlocks
:
1162 &prog
->data
->NumUniformBlocks
;
1164 unsigned max_num_buffer_blocks
= 0;
1165 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
1166 if (prog
->_LinkedShaders
[i
]) {
1167 if (validate_ssbo
) {
1168 max_num_buffer_blocks
+=
1169 prog
->_LinkedShaders
[i
]->Program
->info
.num_ssbos
;
1171 max_num_buffer_blocks
+=
1172 prog
->_LinkedShaders
[i
]->Program
->info
.num_ubos
;
1177 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
1178 struct gl_linked_shader
*sh
= prog
->_LinkedShaders
[i
];
1180 InterfaceBlockStageIndex
[i
] = new int[max_num_buffer_blocks
];
1181 for (unsigned int j
= 0; j
< max_num_buffer_blocks
; j
++)
1182 InterfaceBlockStageIndex
[i
][j
] = -1;
1187 unsigned sh_num_blocks
;
1188 struct gl_uniform_block
**sh_blks
;
1189 if (validate_ssbo
) {
1190 sh_num_blocks
= prog
->_LinkedShaders
[i
]->Program
->info
.num_ssbos
;
1191 sh_blks
= sh
->Program
->sh
.ShaderStorageBlocks
;
1193 sh_num_blocks
= prog
->_LinkedShaders
[i
]->Program
->info
.num_ubos
;
1194 sh_blks
= sh
->Program
->sh
.UniformBlocks
;
1197 for (unsigned int j
= 0; j
< sh_num_blocks
; j
++) {
1198 int index
= link_cross_validate_uniform_block(prog
, &blks
, num_blks
,
1202 linker_error(prog
, "buffer block `%s' has mismatching "
1203 "definitions\n", sh_blks
[j
]->Name
);
1205 for (unsigned k
= 0; k
<= i
; k
++) {
1206 delete[] InterfaceBlockStageIndex
[k
];
1209 /* Reset the block count. This will help avoid various segfaults
1210 * from api calls that assume the array exists due to the count
1217 InterfaceBlockStageIndex
[i
][index
] = j
;
1221 /* Update per stage block pointers to point to the program list.
1222 * FIXME: We should be able to free the per stage blocks here.
1224 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
1225 for (unsigned j
= 0; j
< *num_blks
; j
++) {
1226 int stage_index
= InterfaceBlockStageIndex
[i
][j
];
1228 if (stage_index
!= -1) {
1229 struct gl_linked_shader
*sh
= prog
->_LinkedShaders
[i
];
1231 struct gl_uniform_block
**sh_blks
= validate_ssbo
?
1232 sh
->Program
->sh
.ShaderStorageBlocks
:
1233 sh
->Program
->sh
.UniformBlocks
;
1235 blks
[j
].stageref
|= sh_blks
[stage_index
]->stageref
;
1236 sh_blks
[stage_index
] = &blks
[j
];
1241 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
1242 delete[] InterfaceBlockStageIndex
[i
];
1246 prog
->data
->ShaderStorageBlocks
= blks
;
1248 prog
->data
->UniformBlocks
= blks
;
1255 * Populates a shaders symbol table with all global declarations
1258 populate_symbol_table(gl_linked_shader
*sh
)
1260 sh
->symbols
= new(sh
) glsl_symbol_table
;
1262 foreach_in_list(ir_instruction
, inst
, sh
->ir
) {
1266 if ((func
= inst
->as_function()) != NULL
) {
1267 sh
->symbols
->add_function(func
);
1268 } else if ((var
= inst
->as_variable()) != NULL
) {
1269 if (var
->data
.mode
!= ir_var_temporary
)
1270 sh
->symbols
->add_variable(var
);
1277 * Remap variables referenced in an instruction tree
1279 * This is used when instruction trees are cloned from one shader and placed in
1280 * another. These trees will contain references to \c ir_variable nodes that
1281 * do not exist in the target shader. This function finds these \c ir_variable
1282 * references and replaces the references with matching variables in the target
1285 * If there is no matching variable in the target shader, a clone of the
1286 * \c ir_variable is made and added to the target shader. The new variable is
1287 * added to \b both the instruction stream and the symbol table.
1289 * \param inst IR tree that is to be processed.
1290 * \param symbols Symbol table containing global scope symbols in the
1292 * \param instructions Instruction stream where new variable declarations
1296 remap_variables(ir_instruction
*inst
, struct gl_linked_shader
*target
,
1299 class remap_visitor
: public ir_hierarchical_visitor
{
1301 remap_visitor(struct gl_linked_shader
*target
, hash_table
*temps
)
1303 this->target
= target
;
1304 this->symbols
= target
->symbols
;
1305 this->instructions
= target
->ir
;
1306 this->temps
= temps
;
1309 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
1311 if (ir
->var
->data
.mode
== ir_var_temporary
) {
1312 hash_entry
*entry
= _mesa_hash_table_search(temps
, ir
->var
);
1313 ir_variable
*var
= entry
? (ir_variable
*) entry
->data
: NULL
;
1315 assert(var
!= NULL
);
1317 return visit_continue
;
1320 ir_variable
*const existing
=
1321 this->symbols
->get_variable(ir
->var
->name
);
1322 if (existing
!= NULL
)
1325 ir_variable
*copy
= ir
->var
->clone(this->target
, NULL
);
1327 this->symbols
->add_variable(copy
);
1328 this->instructions
->push_head(copy
);
1332 return visit_continue
;
1336 struct gl_linked_shader
*target
;
1337 glsl_symbol_table
*symbols
;
1338 exec_list
*instructions
;
1342 remap_visitor
v(target
, temps
);
1349 * Move non-declarations from one instruction stream to another
1351 * The intended usage pattern of this function is to pass the pointer to the
1352 * head sentinel of a list (i.e., a pointer to the list cast to an \c exec_node
1353 * pointer) for \c last and \c false for \c make_copies on the first
1354 * call. Successive calls pass the return value of the previous call for
1355 * \c last and \c true for \c make_copies.
1357 * \param instructions Source instruction stream
1358 * \param last Instruction after which new instructions should be
1359 * inserted in the target instruction stream
1360 * \param make_copies Flag selecting whether instructions in \c instructions
1361 * should be copied (via \c ir_instruction::clone) into the
1362 * target list or moved.
1365 * The new "last" instruction in the target instruction stream. This pointer
1366 * is suitable for use as the \c last parameter of a later call to this
1370 move_non_declarations(exec_list
*instructions
, exec_node
*last
,
1371 bool make_copies
, gl_linked_shader
*target
)
1373 hash_table
*temps
= NULL
;
1376 temps
= _mesa_hash_table_create(NULL
, _mesa_hash_pointer
,
1377 _mesa_key_pointer_equal
);
1379 foreach_in_list_safe(ir_instruction
, inst
, instructions
) {
1380 if (inst
->as_function())
1383 ir_variable
*var
= inst
->as_variable();
1384 if ((var
!= NULL
) && (var
->data
.mode
!= ir_var_temporary
))
1387 assert(inst
->as_assignment()
1389 || inst
->as_if() /* for initializers with the ?: operator */
1390 || ((var
!= NULL
) && (var
->data
.mode
== ir_var_temporary
)));
1393 inst
= inst
->clone(target
, NULL
);
1396 _mesa_hash_table_insert(temps
, var
, inst
);
1398 remap_variables(inst
, target
, temps
);
1403 last
->insert_after(inst
);
1408 _mesa_hash_table_destroy(temps
, NULL
);
1415 * This class is only used in link_intrastage_shaders() below but declaring
1416 * it inside that function leads to compiler warnings with some versions of
1419 class array_sizing_visitor
: public deref_type_updater
{
1421 array_sizing_visitor()
1422 : mem_ctx(ralloc_context(NULL
)),
1423 unnamed_interfaces(_mesa_hash_table_create(NULL
, _mesa_hash_pointer
,
1424 _mesa_key_pointer_equal
))
1428 ~array_sizing_visitor()
1430 _mesa_hash_table_destroy(this->unnamed_interfaces
, NULL
);
1431 ralloc_free(this->mem_ctx
);
1434 virtual ir_visitor_status
visit(ir_variable
*var
)
1436 const glsl_type
*type_without_array
;
1437 bool implicit_sized_array
= var
->data
.implicit_sized_array
;
1438 fixup_type(&var
->type
, var
->data
.max_array_access
,
1439 var
->data
.from_ssbo_unsized_array
,
1440 &implicit_sized_array
);
1441 var
->data
.implicit_sized_array
= implicit_sized_array
;
1442 type_without_array
= var
->type
->without_array();
1443 if (var
->type
->is_interface()) {
1444 if (interface_contains_unsized_arrays(var
->type
)) {
1445 const glsl_type
*new_type
=
1446 resize_interface_members(var
->type
,
1447 var
->get_max_ifc_array_access(),
1448 var
->is_in_shader_storage_block());
1449 var
->type
= new_type
;
1450 var
->change_interface_type(new_type
);
1452 } else if (type_without_array
->is_interface()) {
1453 if (interface_contains_unsized_arrays(type_without_array
)) {
1454 const glsl_type
*new_type
=
1455 resize_interface_members(type_without_array
,
1456 var
->get_max_ifc_array_access(),
1457 var
->is_in_shader_storage_block());
1458 var
->change_interface_type(new_type
);
1459 var
->type
= update_interface_members_array(var
->type
, new_type
);
1461 } else if (const glsl_type
*ifc_type
= var
->get_interface_type()) {
1462 /* Store a pointer to the variable in the unnamed_interfaces
1466 _mesa_hash_table_search(this->unnamed_interfaces
,
1469 ir_variable
**interface_vars
= entry
? (ir_variable
**) entry
->data
: NULL
;
1471 if (interface_vars
== NULL
) {
1472 interface_vars
= rzalloc_array(mem_ctx
, ir_variable
*,
1474 _mesa_hash_table_insert(this->unnamed_interfaces
, ifc_type
,
1477 unsigned index
= ifc_type
->field_index(var
->name
);
1478 assert(index
< ifc_type
->length
);
1479 assert(interface_vars
[index
] == NULL
);
1480 interface_vars
[index
] = var
;
1482 return visit_continue
;
1486 * For each unnamed interface block that was discovered while running the
1487 * visitor, adjust the interface type to reflect the newly assigned array
1488 * sizes, and fix up the ir_variable nodes to point to the new interface
1491 void fixup_unnamed_interface_types()
1493 hash_table_call_foreach(this->unnamed_interfaces
,
1494 fixup_unnamed_interface_type
, NULL
);
1499 * If the type pointed to by \c type represents an unsized array, replace
1500 * it with a sized array whose size is determined by max_array_access.
1502 static void fixup_type(const glsl_type
**type
, unsigned max_array_access
,
1503 bool from_ssbo_unsized_array
, bool *implicit_sized
)
1505 if (!from_ssbo_unsized_array
&& (*type
)->is_unsized_array()) {
1506 *type
= glsl_type::get_array_instance((*type
)->fields
.array
,
1507 max_array_access
+ 1);
1508 *implicit_sized
= true;
1509 assert(*type
!= NULL
);
1513 static const glsl_type
*
1514 update_interface_members_array(const glsl_type
*type
,
1515 const glsl_type
*new_interface_type
)
1517 const glsl_type
*element_type
= type
->fields
.array
;
1518 if (element_type
->is_array()) {
1519 const glsl_type
*new_array_type
=
1520 update_interface_members_array(element_type
, new_interface_type
);
1521 return glsl_type::get_array_instance(new_array_type
, type
->length
);
1523 return glsl_type::get_array_instance(new_interface_type
,
1529 * Determine whether the given interface type contains unsized arrays (if
1530 * it doesn't, array_sizing_visitor doesn't need to process it).
1532 static bool interface_contains_unsized_arrays(const glsl_type
*type
)
1534 for (unsigned i
= 0; i
< type
->length
; i
++) {
1535 const glsl_type
*elem_type
= type
->fields
.structure
[i
].type
;
1536 if (elem_type
->is_unsized_array())
1543 * Create a new interface type based on the given type, with unsized arrays
1544 * replaced by sized arrays whose size is determined by
1545 * max_ifc_array_access.
1547 static const glsl_type
*
1548 resize_interface_members(const glsl_type
*type
,
1549 const int *max_ifc_array_access
,
1552 unsigned num_fields
= type
->length
;
1553 glsl_struct_field
*fields
= new glsl_struct_field
[num_fields
];
1554 memcpy(fields
, type
->fields
.structure
,
1555 num_fields
* sizeof(*fields
));
1556 for (unsigned i
= 0; i
< num_fields
; i
++) {
1557 bool implicit_sized_array
= fields
[i
].implicit_sized_array
;
1558 /* If SSBO last member is unsized array, we don't replace it by a sized
1561 if (is_ssbo
&& i
== (num_fields
- 1))
1562 fixup_type(&fields
[i
].type
, max_ifc_array_access
[i
],
1563 true, &implicit_sized_array
);
1565 fixup_type(&fields
[i
].type
, max_ifc_array_access
[i
],
1566 false, &implicit_sized_array
);
1567 fields
[i
].implicit_sized_array
= implicit_sized_array
;
1569 glsl_interface_packing packing
=
1570 (glsl_interface_packing
) type
->interface_packing
;
1571 bool row_major
= (bool) type
->interface_row_major
;
1572 const glsl_type
*new_ifc_type
=
1573 glsl_type::get_interface_instance(fields
, num_fields
,
1574 packing
, row_major
, type
->name
);
1576 return new_ifc_type
;
1579 static void fixup_unnamed_interface_type(const void *key
, void *data
,
1582 const glsl_type
*ifc_type
= (const glsl_type
*) key
;
1583 ir_variable
**interface_vars
= (ir_variable
**) data
;
1584 unsigned num_fields
= ifc_type
->length
;
1585 glsl_struct_field
*fields
= new glsl_struct_field
[num_fields
];
1586 memcpy(fields
, ifc_type
->fields
.structure
,
1587 num_fields
* sizeof(*fields
));
1588 bool interface_type_changed
= false;
1589 for (unsigned i
= 0; i
< num_fields
; i
++) {
1590 if (interface_vars
[i
] != NULL
&&
1591 fields
[i
].type
!= interface_vars
[i
]->type
) {
1592 fields
[i
].type
= interface_vars
[i
]->type
;
1593 interface_type_changed
= true;
1596 if (!interface_type_changed
) {
1600 glsl_interface_packing packing
=
1601 (glsl_interface_packing
) ifc_type
->interface_packing
;
1602 bool row_major
= (bool) ifc_type
->interface_row_major
;
1603 const glsl_type
*new_ifc_type
=
1604 glsl_type::get_interface_instance(fields
, num_fields
, packing
,
1605 row_major
, ifc_type
->name
);
1607 for (unsigned i
= 0; i
< num_fields
; i
++) {
1608 if (interface_vars
[i
] != NULL
)
1609 interface_vars
[i
]->change_interface_type(new_ifc_type
);
1614 * Memory context used to allocate the data in \c unnamed_interfaces.
1619 * Hash table from const glsl_type * to an array of ir_variable *'s
1620 * pointing to the ir_variables constituting each unnamed interface block.
1622 hash_table
*unnamed_interfaces
;
1626 validate_xfb_buffer_stride(struct gl_context
*ctx
, unsigned idx
,
1627 struct gl_shader_program
*prog
)
1629 /* We will validate doubles at a later stage */
1630 if (prog
->TransformFeedback
.BufferStride
[idx
] % 4) {
1631 linker_error(prog
, "invalid qualifier xfb_stride=%d must be a "
1632 "multiple of 4 or if its applied to a type that is "
1633 "or contains a double a multiple of 8.",
1634 prog
->TransformFeedback
.BufferStride
[idx
]);
1638 if (prog
->TransformFeedback
.BufferStride
[idx
] / 4 >
1639 ctx
->Const
.MaxTransformFeedbackInterleavedComponents
) {
1640 linker_error(prog
, "The MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS "
1641 "limit has been exceeded.");
1649 * Check for conflicting xfb_stride default qualifiers and store buffer stride
1653 link_xfb_stride_layout_qualifiers(struct gl_context
*ctx
,
1654 struct gl_shader_program
*prog
,
1655 struct gl_shader
**shader_list
,
1656 unsigned num_shaders
)
1658 for (unsigned i
= 0; i
< MAX_FEEDBACK_BUFFERS
; i
++) {
1659 prog
->TransformFeedback
.BufferStride
[i
] = 0;
1662 for (unsigned i
= 0; i
< num_shaders
; i
++) {
1663 struct gl_shader
*shader
= shader_list
[i
];
1665 for (unsigned j
= 0; j
< MAX_FEEDBACK_BUFFERS
; j
++) {
1666 if (shader
->TransformFeedbackBufferStride
[j
]) {
1667 if (prog
->TransformFeedback
.BufferStride
[j
] == 0) {
1668 prog
->TransformFeedback
.BufferStride
[j
] =
1669 shader
->TransformFeedbackBufferStride
[j
];
1670 if (!validate_xfb_buffer_stride(ctx
, j
, prog
))
1672 } else if (prog
->TransformFeedback
.BufferStride
[j
] !=
1673 shader
->TransformFeedbackBufferStride
[j
]){
1675 "intrastage shaders defined with conflicting "
1676 "xfb_stride for buffer %d (%d and %d)\n", j
,
1677 prog
->TransformFeedback
.BufferStride
[j
],
1678 shader
->TransformFeedbackBufferStride
[j
]);
1687 * Check for conflicting bindless/bound sampler/image layout qualifiers at
1691 link_bindless_layout_qualifiers(struct gl_shader_program
*prog
,
1692 struct gl_shader
**shader_list
,
1693 unsigned num_shaders
)
1695 bool bindless_sampler
, bindless_image
;
1696 bool bound_sampler
, bound_image
;
1698 bindless_sampler
= bindless_image
= false;
1699 bound_sampler
= bound_image
= false;
1701 for (unsigned i
= 0; i
< num_shaders
; i
++) {
1702 struct gl_shader
*shader
= shader_list
[i
];
1704 if (shader
->bindless_sampler
)
1705 bindless_sampler
= true;
1706 if (shader
->bindless_image
)
1707 bindless_image
= true;
1708 if (shader
->bound_sampler
)
1709 bound_sampler
= true;
1710 if (shader
->bound_image
)
1713 if ((bindless_sampler
&& bound_sampler
) ||
1714 (bindless_image
&& bound_image
)) {
1715 /* From section 4.4.6 of the ARB_bindless_texture spec:
1717 * "If both bindless_sampler and bound_sampler, or bindless_image
1718 * and bound_image, are declared at global scope in any
1719 * compilation unit, a link- time error will be generated."
1721 linker_error(prog
, "both bindless_sampler and bound_sampler, or "
1722 "bindless_image and bound_image, can't be declared at "
1729 * Performs the cross-validation of tessellation control shader vertices and
1730 * layout qualifiers for the attached tessellation control shaders,
1731 * and propagates them to the linked TCS and linked shader program.
1734 link_tcs_out_layout_qualifiers(struct gl_shader_program
*prog
,
1735 struct gl_program
*gl_prog
,
1736 struct gl_shader
**shader_list
,
1737 unsigned num_shaders
)
1739 if (gl_prog
->info
.stage
!= MESA_SHADER_TESS_CTRL
)
1742 gl_prog
->info
.tess
.tcs_vertices_out
= 0;
1744 /* From the GLSL 4.0 spec (chapter 4.3.8.2):
1746 * "All tessellation control shader layout declarations in a program
1747 * must specify the same output patch vertex count. There must be at
1748 * least one layout qualifier specifying an output patch vertex count
1749 * in any program containing tessellation control shaders; however,
1750 * such a declaration is not required in all tessellation control
1754 for (unsigned i
= 0; i
< num_shaders
; i
++) {
1755 struct gl_shader
*shader
= shader_list
[i
];
1757 if (shader
->info
.TessCtrl
.VerticesOut
!= 0) {
1758 if (gl_prog
->info
.tess
.tcs_vertices_out
!= 0 &&
1759 gl_prog
->info
.tess
.tcs_vertices_out
!=
1760 (unsigned) shader
->info
.TessCtrl
.VerticesOut
) {
1761 linker_error(prog
, "tessellation control shader defined with "
1762 "conflicting output vertex count (%d and %d)\n",
1763 gl_prog
->info
.tess
.tcs_vertices_out
,
1764 shader
->info
.TessCtrl
.VerticesOut
);
1767 gl_prog
->info
.tess
.tcs_vertices_out
=
1768 shader
->info
.TessCtrl
.VerticesOut
;
1772 /* Just do the intrastage -> interstage propagation right now,
1773 * since we already know we're in the right type of shader program
1776 if (gl_prog
->info
.tess
.tcs_vertices_out
== 0) {
1777 linker_error(prog
, "tessellation control shader didn't declare "
1778 "vertices out layout qualifier\n");
1785 * Performs the cross-validation of tessellation evaluation shader
1786 * primitive type, vertex spacing, ordering and point_mode layout qualifiers
1787 * for the attached tessellation evaluation shaders, and propagates them
1788 * to the linked TES and linked shader program.
1791 link_tes_in_layout_qualifiers(struct gl_shader_program
*prog
,
1792 struct gl_program
*gl_prog
,
1793 struct gl_shader
**shader_list
,
1794 unsigned num_shaders
)
1796 if (gl_prog
->info
.stage
!= MESA_SHADER_TESS_EVAL
)
1799 int point_mode
= -1;
1800 unsigned vertex_order
= 0;
1802 gl_prog
->info
.tess
.primitive_mode
= PRIM_UNKNOWN
;
1803 gl_prog
->info
.tess
.spacing
= TESS_SPACING_UNSPECIFIED
;
1805 /* From the GLSL 4.0 spec (chapter 4.3.8.1):
1807 * "At least one tessellation evaluation shader (compilation unit) in
1808 * a program must declare a primitive mode in its input layout.
1809 * Declaration vertex spacing, ordering, and point mode identifiers is
1810 * optional. It is not required that all tessellation evaluation
1811 * shaders in a program declare a primitive mode. If spacing or
1812 * vertex ordering declarations are omitted, the tessellation
1813 * primitive generator will use equal spacing or counter-clockwise
1814 * vertex ordering, respectively. If a point mode declaration is
1815 * omitted, the tessellation primitive generator will produce lines or
1816 * triangles according to the primitive mode."
1819 for (unsigned i
= 0; i
< num_shaders
; i
++) {
1820 struct gl_shader
*shader
= shader_list
[i
];
1822 if (shader
->info
.TessEval
.PrimitiveMode
!= PRIM_UNKNOWN
) {
1823 if (gl_prog
->info
.tess
.primitive_mode
!= PRIM_UNKNOWN
&&
1824 gl_prog
->info
.tess
.primitive_mode
!=
1825 shader
->info
.TessEval
.PrimitiveMode
) {
1826 linker_error(prog
, "tessellation evaluation shader defined with "
1827 "conflicting input primitive modes.\n");
1830 gl_prog
->info
.tess
.primitive_mode
=
1831 shader
->info
.TessEval
.PrimitiveMode
;
1834 if (shader
->info
.TessEval
.Spacing
!= 0) {
1835 if (gl_prog
->info
.tess
.spacing
!= 0 && gl_prog
->info
.tess
.spacing
!=
1836 shader
->info
.TessEval
.Spacing
) {
1837 linker_error(prog
, "tessellation evaluation shader defined with "
1838 "conflicting vertex spacing.\n");
1841 gl_prog
->info
.tess
.spacing
= shader
->info
.TessEval
.Spacing
;
1844 if (shader
->info
.TessEval
.VertexOrder
!= 0) {
1845 if (vertex_order
!= 0 &&
1846 vertex_order
!= shader
->info
.TessEval
.VertexOrder
) {
1847 linker_error(prog
, "tessellation evaluation shader defined with "
1848 "conflicting ordering.\n");
1851 vertex_order
= shader
->info
.TessEval
.VertexOrder
;
1854 if (shader
->info
.TessEval
.PointMode
!= -1) {
1855 if (point_mode
!= -1 &&
1856 point_mode
!= shader
->info
.TessEval
.PointMode
) {
1857 linker_error(prog
, "tessellation evaluation shader defined with "
1858 "conflicting point modes.\n");
1861 point_mode
= shader
->info
.TessEval
.PointMode
;
1866 /* Just do the intrastage -> interstage propagation right now,
1867 * since we already know we're in the right type of shader program
1870 if (gl_prog
->info
.tess
.primitive_mode
== PRIM_UNKNOWN
) {
1872 "tessellation evaluation shader didn't declare input "
1873 "primitive modes.\n");
1877 if (gl_prog
->info
.tess
.spacing
== TESS_SPACING_UNSPECIFIED
)
1878 gl_prog
->info
.tess
.spacing
= TESS_SPACING_EQUAL
;
1880 if (vertex_order
== 0 || vertex_order
== GL_CCW
)
1881 gl_prog
->info
.tess
.ccw
= true;
1883 gl_prog
->info
.tess
.ccw
= false;
1886 if (point_mode
== -1 || point_mode
== GL_FALSE
)
1887 gl_prog
->info
.tess
.point_mode
= false;
1889 gl_prog
->info
.tess
.point_mode
= true;
1894 * Performs the cross-validation of layout qualifiers specified in
1895 * redeclaration of gl_FragCoord for the attached fragment shaders,
1896 * and propagates them to the linked FS and linked shader program.
1899 link_fs_inout_layout_qualifiers(struct gl_shader_program
*prog
,
1900 struct gl_linked_shader
*linked_shader
,
1901 struct gl_shader
**shader_list
,
1902 unsigned num_shaders
)
1904 bool redeclares_gl_fragcoord
= false;
1905 bool uses_gl_fragcoord
= false;
1906 bool origin_upper_left
= false;
1907 bool pixel_center_integer
= false;
1909 if (linked_shader
->Stage
!= MESA_SHADER_FRAGMENT
||
1910 (prog
->data
->Version
< 150 &&
1911 !prog
->ARB_fragment_coord_conventions_enable
))
1914 for (unsigned i
= 0; i
< num_shaders
; i
++) {
1915 struct gl_shader
*shader
= shader_list
[i
];
1916 /* From the GLSL 1.50 spec, page 39:
1918 * "If gl_FragCoord is redeclared in any fragment shader in a program,
1919 * it must be redeclared in all the fragment shaders in that program
1920 * that have a static use gl_FragCoord."
1922 if ((redeclares_gl_fragcoord
&& !shader
->redeclares_gl_fragcoord
&&
1923 shader
->uses_gl_fragcoord
)
1924 || (shader
->redeclares_gl_fragcoord
&& !redeclares_gl_fragcoord
&&
1925 uses_gl_fragcoord
)) {
1926 linker_error(prog
, "fragment shader defined with conflicting "
1927 "layout qualifiers for gl_FragCoord\n");
1930 /* From the GLSL 1.50 spec, page 39:
1932 * "All redeclarations of gl_FragCoord in all fragment shaders in a
1933 * single program must have the same set of qualifiers."
1935 if (redeclares_gl_fragcoord
&& shader
->redeclares_gl_fragcoord
&&
1936 (shader
->origin_upper_left
!= origin_upper_left
||
1937 shader
->pixel_center_integer
!= pixel_center_integer
)) {
1938 linker_error(prog
, "fragment shader defined with conflicting "
1939 "layout qualifiers for gl_FragCoord\n");
1942 /* Update the linked shader state. Note that uses_gl_fragcoord should
1943 * accumulate the results. The other values should replace. If there
1944 * are multiple redeclarations, all the fields except uses_gl_fragcoord
1945 * are already known to be the same.
1947 if (shader
->redeclares_gl_fragcoord
|| shader
->uses_gl_fragcoord
) {
1948 redeclares_gl_fragcoord
= shader
->redeclares_gl_fragcoord
;
1949 uses_gl_fragcoord
|= shader
->uses_gl_fragcoord
;
1950 origin_upper_left
= shader
->origin_upper_left
;
1951 pixel_center_integer
= shader
->pixel_center_integer
;
1954 linked_shader
->Program
->info
.fs
.early_fragment_tests
|=
1955 shader
->EarlyFragmentTests
|| shader
->PostDepthCoverage
;
1956 linked_shader
->Program
->info
.fs
.inner_coverage
|= shader
->InnerCoverage
;
1957 linked_shader
->Program
->info
.fs
.post_depth_coverage
|=
1958 shader
->PostDepthCoverage
;
1960 linked_shader
->Program
->sh
.fs
.BlendSupport
|= shader
->BlendSupport
;
1965 * Performs the cross-validation of geometry shader max_vertices and
1966 * primitive type layout qualifiers for the attached geometry shaders,
1967 * and propagates them to the linked GS and linked shader program.
1970 link_gs_inout_layout_qualifiers(struct gl_shader_program
*prog
,
1971 struct gl_program
*gl_prog
,
1972 struct gl_shader
**shader_list
,
1973 unsigned num_shaders
)
1975 /* No in/out qualifiers defined for anything but GLSL 1.50+
1976 * geometry shaders so far.
1978 if (gl_prog
->info
.stage
!= MESA_SHADER_GEOMETRY
||
1979 prog
->data
->Version
< 150)
1982 int vertices_out
= -1;
1984 gl_prog
->info
.gs
.invocations
= 0;
1985 gl_prog
->info
.gs
.input_primitive
= PRIM_UNKNOWN
;
1986 gl_prog
->info
.gs
.output_primitive
= PRIM_UNKNOWN
;
1988 /* From the GLSL 1.50 spec, page 46:
1990 * "All geometry shader output layout declarations in a program
1991 * must declare the same layout and same value for
1992 * max_vertices. There must be at least one geometry output
1993 * layout declaration somewhere in a program, but not all
1994 * geometry shaders (compilation units) are required to
1998 for (unsigned i
= 0; i
< num_shaders
; i
++) {
1999 struct gl_shader
*shader
= shader_list
[i
];
2001 if (shader
->info
.Geom
.InputType
!= PRIM_UNKNOWN
) {
2002 if (gl_prog
->info
.gs
.input_primitive
!= PRIM_UNKNOWN
&&
2003 gl_prog
->info
.gs
.input_primitive
!=
2004 shader
->info
.Geom
.InputType
) {
2005 linker_error(prog
, "geometry shader defined with conflicting "
2009 gl_prog
->info
.gs
.input_primitive
= shader
->info
.Geom
.InputType
;
2012 if (shader
->info
.Geom
.OutputType
!= PRIM_UNKNOWN
) {
2013 if (gl_prog
->info
.gs
.output_primitive
!= PRIM_UNKNOWN
&&
2014 gl_prog
->info
.gs
.output_primitive
!=
2015 shader
->info
.Geom
.OutputType
) {
2016 linker_error(prog
, "geometry shader defined with conflicting "
2020 gl_prog
->info
.gs
.output_primitive
= shader
->info
.Geom
.OutputType
;
2023 if (shader
->info
.Geom
.VerticesOut
!= -1) {
2024 if (vertices_out
!= -1 &&
2025 vertices_out
!= shader
->info
.Geom
.VerticesOut
) {
2026 linker_error(prog
, "geometry shader defined with conflicting "
2027 "output vertex count (%d and %d)\n",
2028 vertices_out
, shader
->info
.Geom
.VerticesOut
);
2031 vertices_out
= shader
->info
.Geom
.VerticesOut
;
2034 if (shader
->info
.Geom
.Invocations
!= 0) {
2035 if (gl_prog
->info
.gs
.invocations
!= 0 &&
2036 gl_prog
->info
.gs
.invocations
!=
2037 (unsigned) shader
->info
.Geom
.Invocations
) {
2038 linker_error(prog
, "geometry shader defined with conflicting "
2039 "invocation count (%d and %d)\n",
2040 gl_prog
->info
.gs
.invocations
,
2041 shader
->info
.Geom
.Invocations
);
2044 gl_prog
->info
.gs
.invocations
= shader
->info
.Geom
.Invocations
;
2048 /* Just do the intrastage -> interstage propagation right now,
2049 * since we already know we're in the right type of shader program
2052 if (gl_prog
->info
.gs
.input_primitive
== PRIM_UNKNOWN
) {
2054 "geometry shader didn't declare primitive input type\n");
2058 if (gl_prog
->info
.gs
.output_primitive
== PRIM_UNKNOWN
) {
2060 "geometry shader didn't declare primitive output type\n");
2064 if (vertices_out
== -1) {
2066 "geometry shader didn't declare max_vertices\n");
2069 gl_prog
->info
.gs
.vertices_out
= vertices_out
;
2072 if (gl_prog
->info
.gs
.invocations
== 0)
2073 gl_prog
->info
.gs
.invocations
= 1;
2078 * Perform cross-validation of compute shader local_size_{x,y,z} layout
2079 * qualifiers for the attached compute shaders, and propagate them to the
2080 * linked CS and linked shader program.
2083 link_cs_input_layout_qualifiers(struct gl_shader_program
*prog
,
2084 struct gl_program
*gl_prog
,
2085 struct gl_shader
**shader_list
,
2086 unsigned num_shaders
)
2088 /* This function is called for all shader stages, but it only has an effect
2089 * for compute shaders.
2091 if (gl_prog
->info
.stage
!= MESA_SHADER_COMPUTE
)
2094 for (int i
= 0; i
< 3; i
++)
2095 gl_prog
->info
.cs
.local_size
[i
] = 0;
2097 gl_prog
->info
.cs
.local_size_variable
= false;
2099 /* From the ARB_compute_shader spec, in the section describing local size
2102 * If multiple compute shaders attached to a single program object
2103 * declare local work-group size, the declarations must be identical;
2104 * otherwise a link-time error results. Furthermore, if a program
2105 * object contains any compute shaders, at least one must contain an
2106 * input layout qualifier specifying the local work sizes of the
2107 * program, or a link-time error will occur.
2109 for (unsigned sh
= 0; sh
< num_shaders
; sh
++) {
2110 struct gl_shader
*shader
= shader_list
[sh
];
2112 if (shader
->info
.Comp
.LocalSize
[0] != 0) {
2113 if (gl_prog
->info
.cs
.local_size
[0] != 0) {
2114 for (int i
= 0; i
< 3; i
++) {
2115 if (gl_prog
->info
.cs
.local_size
[i
] !=
2116 shader
->info
.Comp
.LocalSize
[i
]) {
2117 linker_error(prog
, "compute shader defined with conflicting "
2123 for (int i
= 0; i
< 3; i
++) {
2124 gl_prog
->info
.cs
.local_size
[i
] =
2125 shader
->info
.Comp
.LocalSize
[i
];
2127 } else if (shader
->info
.Comp
.LocalSizeVariable
) {
2128 if (gl_prog
->info
.cs
.local_size
[0] != 0) {
2129 /* The ARB_compute_variable_group_size spec says:
2131 * If one compute shader attached to a program declares a
2132 * variable local group size and a second compute shader
2133 * attached to the same program declares a fixed local group
2134 * size, a link-time error results.
2136 linker_error(prog
, "compute shader defined with both fixed and "
2137 "variable local group size\n");
2140 gl_prog
->info
.cs
.local_size_variable
= true;
2144 /* Just do the intrastage -> interstage propagation right now,
2145 * since we already know we're in the right type of shader program
2148 if (gl_prog
->info
.cs
.local_size
[0] == 0 &&
2149 !gl_prog
->info
.cs
.local_size_variable
) {
2150 linker_error(prog
, "compute shader must contain a fixed or a variable "
2151 "local group size\n");
2158 * Combine a group of shaders for a single stage to generate a linked shader
2161 * If this function is supplied a single shader, it is cloned, and the new
2162 * shader is returned.
2164 struct gl_linked_shader
*
2165 link_intrastage_shaders(void *mem_ctx
,
2166 struct gl_context
*ctx
,
2167 struct gl_shader_program
*prog
,
2168 struct gl_shader
**shader_list
,
2169 unsigned num_shaders
,
2170 bool allow_missing_main
)
2172 struct gl_uniform_block
*ubo_blocks
= NULL
;
2173 struct gl_uniform_block
*ssbo_blocks
= NULL
;
2174 unsigned num_ubo_blocks
= 0;
2175 unsigned num_ssbo_blocks
= 0;
2177 /* Check that global variables defined in multiple shaders are consistent.
2179 glsl_symbol_table variables
;
2180 for (unsigned i
= 0; i
< num_shaders
; i
++) {
2181 if (shader_list
[i
] == NULL
)
2183 cross_validate_globals(prog
, shader_list
[i
]->ir
, &variables
, false);
2186 if (!prog
->data
->LinkStatus
)
2189 /* Check that interface blocks defined in multiple shaders are consistent.
2191 validate_intrastage_interface_blocks(prog
, (const gl_shader
**)shader_list
,
2193 if (!prog
->data
->LinkStatus
)
2196 /* Check that there is only a single definition of each function signature
2197 * across all shaders.
2199 for (unsigned i
= 0; i
< (num_shaders
- 1); i
++) {
2200 foreach_in_list(ir_instruction
, node
, shader_list
[i
]->ir
) {
2201 ir_function
*const f
= node
->as_function();
2206 for (unsigned j
= i
+ 1; j
< num_shaders
; j
++) {
2207 ir_function
*const other
=
2208 shader_list
[j
]->symbols
->get_function(f
->name
);
2210 /* If the other shader has no function (and therefore no function
2211 * signatures) with the same name, skip to the next shader.
2216 foreach_in_list(ir_function_signature
, sig
, &f
->signatures
) {
2217 if (!sig
->is_defined
)
2220 ir_function_signature
*other_sig
=
2221 other
->exact_matching_signature(NULL
, &sig
->parameters
);
2223 if (other_sig
!= NULL
&& other_sig
->is_defined
) {
2224 linker_error(prog
, "function `%s' is multiply defined\n",
2233 /* Find the shader that defines main, and make a clone of it.
2235 * Starting with the clone, search for undefined references. If one is
2236 * found, find the shader that defines it. Clone the reference and add
2237 * it to the shader. Repeat until there are no undefined references or
2238 * until a reference cannot be resolved.
2240 gl_shader
*main
= NULL
;
2241 for (unsigned i
= 0; i
< num_shaders
; i
++) {
2242 if (_mesa_get_main_function_signature(shader_list
[i
]->symbols
)) {
2243 main
= shader_list
[i
];
2248 if (main
== NULL
&& allow_missing_main
)
2249 main
= shader_list
[0];
2252 linker_error(prog
, "%s shader lacks `main'\n",
2253 _mesa_shader_stage_to_string(shader_list
[0]->Stage
));
2257 gl_linked_shader
*linked
= rzalloc(NULL
, struct gl_linked_shader
);
2258 linked
->Stage
= shader_list
[0]->Stage
;
2260 /* Create program and attach it to the linked shader */
2261 struct gl_program
*gl_prog
=
2262 ctx
->Driver
.NewProgram(ctx
,
2263 _mesa_shader_stage_to_program(shader_list
[0]->Stage
),
2266 prog
->data
->LinkStatus
= linking_failure
;
2267 _mesa_delete_linked_shader(ctx
, linked
);
2271 if (!prog
->data
->cache_fallback
)
2272 _mesa_reference_shader_program_data(ctx
, &gl_prog
->sh
.data
, prog
->data
);
2274 /* Don't use _mesa_reference_program() just take ownership */
2275 linked
->Program
= gl_prog
;
2277 linked
->ir
= new(linked
) exec_list
;
2278 clone_ir_list(mem_ctx
, linked
->ir
, main
->ir
);
2280 link_fs_inout_layout_qualifiers(prog
, linked
, shader_list
, num_shaders
);
2281 link_tcs_out_layout_qualifiers(prog
, gl_prog
, shader_list
, num_shaders
);
2282 link_tes_in_layout_qualifiers(prog
, gl_prog
, shader_list
, num_shaders
);
2283 link_gs_inout_layout_qualifiers(prog
, gl_prog
, shader_list
, num_shaders
);
2284 link_cs_input_layout_qualifiers(prog
, gl_prog
, shader_list
, num_shaders
);
2286 if (linked
->Stage
!= MESA_SHADER_FRAGMENT
)
2287 link_xfb_stride_layout_qualifiers(ctx
, prog
, shader_list
, num_shaders
);
2289 link_bindless_layout_qualifiers(prog
, shader_list
, num_shaders
);
2291 populate_symbol_table(linked
);
2293 /* The pointer to the main function in the final linked shader (i.e., the
2294 * copy of the original shader that contained the main function).
2296 ir_function_signature
*const main_sig
=
2297 _mesa_get_main_function_signature(linked
->symbols
);
2299 /* Move any instructions other than variable declarations or function
2300 * declarations into main.
2302 if (main_sig
!= NULL
) {
2303 exec_node
*insertion_point
=
2304 move_non_declarations(linked
->ir
, (exec_node
*) &main_sig
->body
, false,
2307 for (unsigned i
= 0; i
< num_shaders
; i
++) {
2308 if (shader_list
[i
] == main
)
2311 insertion_point
= move_non_declarations(shader_list
[i
]->ir
,
2312 insertion_point
, true, linked
);
2316 if (!link_function_calls(prog
, linked
, shader_list
, num_shaders
)) {
2317 _mesa_delete_linked_shader(ctx
, linked
);
2321 /* Make a pass over all variable declarations to ensure that arrays with
2322 * unspecified sizes have a size specified. The size is inferred from the
2323 * max_array_access field.
2325 array_sizing_visitor v
;
2327 v
.fixup_unnamed_interface_types();
2329 if (!prog
->data
->cache_fallback
) {
2330 /* Link up uniform blocks defined within this stage. */
2331 link_uniform_blocks(mem_ctx
, ctx
, prog
, linked
, &ubo_blocks
,
2332 &num_ubo_blocks
, &ssbo_blocks
, &num_ssbo_blocks
);
2334 if (!prog
->data
->LinkStatus
) {
2335 _mesa_delete_linked_shader(ctx
, linked
);
2339 /* Copy ubo blocks to linked shader list */
2340 linked
->Program
->sh
.UniformBlocks
=
2341 ralloc_array(linked
, gl_uniform_block
*, num_ubo_blocks
);
2342 ralloc_steal(linked
, ubo_blocks
);
2343 for (unsigned i
= 0; i
< num_ubo_blocks
; i
++) {
2344 linked
->Program
->sh
.UniformBlocks
[i
] = &ubo_blocks
[i
];
2346 linked
->Program
->info
.num_ubos
= num_ubo_blocks
;
2348 /* Copy ssbo blocks to linked shader list */
2349 linked
->Program
->sh
.ShaderStorageBlocks
=
2350 ralloc_array(linked
, gl_uniform_block
*, num_ssbo_blocks
);
2351 ralloc_steal(linked
, ssbo_blocks
);
2352 for (unsigned i
= 0; i
< num_ssbo_blocks
; i
++) {
2353 linked
->Program
->sh
.ShaderStorageBlocks
[i
] = &ssbo_blocks
[i
];
2355 linked
->Program
->info
.num_ssbos
= num_ssbo_blocks
;
2358 /* At this point linked should contain all of the linked IR, so
2359 * validate it to make sure nothing went wrong.
2361 validate_ir_tree(linked
->ir
);
2363 /* Set the size of geometry shader input arrays */
2364 if (linked
->Stage
== MESA_SHADER_GEOMETRY
) {
2365 unsigned num_vertices
=
2366 vertices_per_prim(gl_prog
->info
.gs
.input_primitive
);
2367 array_resize_visitor
input_resize_visitor(num_vertices
, prog
,
2368 MESA_SHADER_GEOMETRY
);
2369 foreach_in_list(ir_instruction
, ir
, linked
->ir
) {
2370 ir
->accept(&input_resize_visitor
);
2374 if (ctx
->Const
.VertexID_is_zero_based
)
2375 lower_vertex_id(linked
);
2377 if (ctx
->Const
.LowerCsDerivedVariables
)
2378 lower_cs_derived(linked
);
2381 /* Compute the source checksum. */
2382 linked
->SourceChecksum
= 0;
2383 for (unsigned i
= 0; i
< num_shaders
; i
++) {
2384 if (shader_list
[i
] == NULL
)
2386 linked
->SourceChecksum
^= shader_list
[i
]->SourceChecksum
;
2394 * Update the sizes of linked shader uniform arrays to the maximum
2397 * From page 81 (page 95 of the PDF) of the OpenGL 2.1 spec:
2399 * If one or more elements of an array are active,
2400 * GetActiveUniform will return the name of the array in name,
2401 * subject to the restrictions listed above. The type of the array
2402 * is returned in type. The size parameter contains the highest
2403 * array element index used, plus one. The compiler or linker
2404 * determines the highest index used. There will be only one
2405 * active uniform reported by the GL per uniform array.
2409 update_array_sizes(struct gl_shader_program
*prog
)
2411 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
2412 if (prog
->_LinkedShaders
[i
] == NULL
)
2415 bool types_were_updated
= false;
2417 foreach_in_list(ir_instruction
, node
, prog
->_LinkedShaders
[i
]->ir
) {
2418 ir_variable
*const var
= node
->as_variable();
2420 if ((var
== NULL
) || (var
->data
.mode
!= ir_var_uniform
) ||
2421 !var
->type
->is_array())
2424 /* GL_ARB_uniform_buffer_object says that std140 uniforms
2425 * will not be eliminated. Since we always do std140, just
2426 * don't resize arrays in UBOs.
2428 * Atomic counters are supposed to get deterministic
2429 * locations assigned based on the declaration ordering and
2430 * sizes, array compaction would mess that up.
2432 * Subroutine uniforms are not removed.
2434 if (var
->is_in_buffer_block() || var
->type
->contains_atomic() ||
2435 var
->type
->contains_subroutine() || var
->constant_initializer
)
2438 int size
= var
->data
.max_array_access
;
2439 for (unsigned j
= 0; j
< MESA_SHADER_STAGES
; j
++) {
2440 if (prog
->_LinkedShaders
[j
] == NULL
)
2443 foreach_in_list(ir_instruction
, node2
, prog
->_LinkedShaders
[j
]->ir
) {
2444 ir_variable
*other_var
= node2
->as_variable();
2448 if (strcmp(var
->name
, other_var
->name
) == 0 &&
2449 other_var
->data
.max_array_access
> size
) {
2450 size
= other_var
->data
.max_array_access
;
2455 if (size
+ 1 != (int)var
->type
->length
) {
2456 /* If this is a built-in uniform (i.e., it's backed by some
2457 * fixed-function state), adjust the number of state slots to
2458 * match the new array size. The number of slots per array entry
2459 * is not known. It seems safe to assume that the total number of
2460 * slots is an integer multiple of the number of array elements.
2461 * Determine the number of slots per array element by dividing by
2462 * the old (total) size.
2464 const unsigned num_slots
= var
->get_num_state_slots();
2465 if (num_slots
> 0) {
2466 var
->set_num_state_slots((size
+ 1)
2467 * (num_slots
/ var
->type
->length
));
2470 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
2472 types_were_updated
= true;
2476 /* Update the types of dereferences in case we changed any. */
2477 if (types_were_updated
) {
2478 deref_type_updater v
;
2479 v
.run(prog
->_LinkedShaders
[i
]->ir
);
2485 * Resize tessellation evaluation per-vertex inputs to the size of
2486 * tessellation control per-vertex outputs.
2489 resize_tes_inputs(struct gl_context
*ctx
,
2490 struct gl_shader_program
*prog
)
2492 if (prog
->_LinkedShaders
[MESA_SHADER_TESS_EVAL
] == NULL
)
2495 gl_linked_shader
*const tcs
= prog
->_LinkedShaders
[MESA_SHADER_TESS_CTRL
];
2496 gl_linked_shader
*const tes
= prog
->_LinkedShaders
[MESA_SHADER_TESS_EVAL
];
2498 /* If no control shader is present, then the TES inputs are statically
2499 * sized to MaxPatchVertices; the actual size of the arrays won't be
2500 * known until draw time.
2502 const int num_vertices
= tcs
2503 ? tcs
->Program
->info
.tess
.tcs_vertices_out
2504 : ctx
->Const
.MaxPatchVertices
;
2506 array_resize_visitor
input_resize_visitor(num_vertices
, prog
,
2507 MESA_SHADER_TESS_EVAL
);
2508 foreach_in_list(ir_instruction
, ir
, tes
->ir
) {
2509 ir
->accept(&input_resize_visitor
);
2512 if (tcs
|| ctx
->Const
.LowerTESPatchVerticesIn
) {
2513 /* Convert the gl_PatchVerticesIn system value into a constant, since
2514 * the value is known at this point.
2516 foreach_in_list(ir_instruction
, ir
, tes
->ir
) {
2517 ir_variable
*var
= ir
->as_variable();
2518 if (var
&& var
->data
.mode
== ir_var_system_value
&&
2519 var
->data
.location
== SYSTEM_VALUE_VERTICES_IN
) {
2520 void *mem_ctx
= ralloc_parent(var
);
2521 var
->data
.location
= 0;
2522 var
->data
.explicit_location
= false;
2524 var
->data
.mode
= ir_var_auto
;
2525 var
->constant_value
= new(mem_ctx
) ir_constant(num_vertices
);
2527 var
->data
.mode
= ir_var_uniform
;
2528 var
->data
.how_declared
= ir_var_hidden
;
2529 var
->allocate_state_slots(1);
2530 ir_state_slot
*slot0
= &var
->get_state_slots()[0];
2531 slot0
->swizzle
= SWIZZLE_XXXX
;
2532 slot0
->tokens
[0] = STATE_INTERNAL
;
2533 slot0
->tokens
[1] = STATE_TES_PATCH_VERTICES_IN
;
2534 for (int i
= 2; i
< STATE_LENGTH
; i
++)
2535 slot0
->tokens
[i
] = 0;
2543 * Find a contiguous set of available bits in a bitmask.
2545 * \param used_mask Bits representing used (1) and unused (0) locations
2546 * \param needed_count Number of contiguous bits needed.
2549 * Base location of the available bits on success or -1 on failure.
2552 find_available_slots(unsigned used_mask
, unsigned needed_count
)
2554 unsigned needed_mask
= (1 << needed_count
) - 1;
2555 const int max_bit_to_test
= (8 * sizeof(used_mask
)) - needed_count
;
2557 /* The comparison to 32 is redundant, but without it GCC emits "warning:
2558 * cannot optimize possibly infinite loops" for the loop below.
2560 if ((needed_count
== 0) || (max_bit_to_test
< 0) || (max_bit_to_test
> 32))
2563 for (int i
= 0; i
<= max_bit_to_test
; i
++) {
2564 if ((needed_mask
& ~used_mask
) == needed_mask
)
2575 * Assign locations for either VS inputs or FS outputs
2577 * \param mem_ctx Temporary ralloc context used for linking
2578 * \param prog Shader program whose variables need locations assigned
2579 * \param constants Driver specific constant values for the program.
2580 * \param target_index Selector for the program target to receive location
2581 * assignmnets. Must be either \c MESA_SHADER_VERTEX or
2582 * \c MESA_SHADER_FRAGMENT.
2585 * If locations are successfully assigned, true is returned. Otherwise an
2586 * error is emitted to the shader link log and false is returned.
2589 assign_attribute_or_color_locations(void *mem_ctx
,
2590 gl_shader_program
*prog
,
2591 struct gl_constants
*constants
,
2592 unsigned target_index
)
2594 /* Maximum number of generic locations. This corresponds to either the
2595 * maximum number of draw buffers or the maximum number of generic
2598 unsigned max_index
= (target_index
== MESA_SHADER_VERTEX
) ?
2599 constants
->Program
[target_index
].MaxAttribs
:
2600 MAX2(constants
->MaxDrawBuffers
, constants
->MaxDualSourceDrawBuffers
);
2602 /* Mark invalid locations as being used.
2604 unsigned used_locations
= (max_index
>= 32)
2605 ? ~0 : ~((1 << max_index
) - 1);
2606 unsigned double_storage_locations
= 0;
2608 assert((target_index
== MESA_SHADER_VERTEX
)
2609 || (target_index
== MESA_SHADER_FRAGMENT
));
2611 gl_linked_shader
*const sh
= prog
->_LinkedShaders
[target_index
];
2615 /* Operate in a total of four passes.
2617 * 1. Invalidate the location assignments for all vertex shader inputs.
2619 * 2. Assign locations for inputs that have user-defined (via
2620 * glBindVertexAttribLocation) locations and outputs that have
2621 * user-defined locations (via glBindFragDataLocation).
2623 * 3. Sort the attributes without assigned locations by number of slots
2624 * required in decreasing order. Fragmentation caused by attribute
2625 * locations assigned by the application may prevent large attributes
2626 * from having enough contiguous space.
2628 * 4. Assign locations to any inputs without assigned locations.
2631 const int generic_base
= (target_index
== MESA_SHADER_VERTEX
)
2632 ? (int) VERT_ATTRIB_GENERIC0
: (int) FRAG_RESULT_DATA0
;
2634 const enum ir_variable_mode direction
=
2635 (target_index
== MESA_SHADER_VERTEX
)
2636 ? ir_var_shader_in
: ir_var_shader_out
;
2639 /* Temporary storage for the set of attributes that need locations assigned.
2645 /* Used below in the call to qsort. */
2646 static int compare(const void *a
, const void *b
)
2648 const temp_attr
*const l
= (const temp_attr
*) a
;
2649 const temp_attr
*const r
= (const temp_attr
*) b
;
2651 /* Reversed because we want a descending order sort below. */
2652 return r
->slots
- l
->slots
;
2655 assert(max_index
<= 32);
2657 /* Temporary array for the set of attributes that have locations assigned,
2658 * for the purpose of checking overlapping slots/components of (non-ES)
2659 * fragment shader outputs.
2661 ir_variable
*assigned
[12 * 4]; /* (max # of FS outputs) * # components */
2662 unsigned assigned_attr
= 0;
2664 unsigned num_attr
= 0;
2666 foreach_in_list(ir_instruction
, node
, sh
->ir
) {
2667 ir_variable
*const var
= node
->as_variable();
2669 if ((var
== NULL
) || (var
->data
.mode
!= (unsigned) direction
))
2672 if (var
->data
.explicit_location
) {
2673 var
->data
.is_unmatched_generic_inout
= 0;
2674 if ((var
->data
.location
>= (int)(max_index
+ generic_base
))
2675 || (var
->data
.location
< 0)) {
2677 "invalid explicit location %d specified for `%s'\n",
2678 (var
->data
.location
< 0)
2679 ? var
->data
.location
2680 : var
->data
.location
- generic_base
,
2684 } else if (target_index
== MESA_SHADER_VERTEX
) {
2687 if (prog
->AttributeBindings
->get(binding
, var
->name
)) {
2688 assert(binding
>= VERT_ATTRIB_GENERIC0
);
2689 var
->data
.location
= binding
;
2690 var
->data
.is_unmatched_generic_inout
= 0;
2692 } else if (target_index
== MESA_SHADER_FRAGMENT
) {
2695 const char *name
= var
->name
;
2696 const glsl_type
*type
= var
->type
;
2699 /* Check if there's a binding for the variable name */
2700 if (prog
->FragDataBindings
->get(binding
, name
)) {
2701 assert(binding
>= FRAG_RESULT_DATA0
);
2702 var
->data
.location
= binding
;
2703 var
->data
.is_unmatched_generic_inout
= 0;
2705 if (prog
->FragDataIndexBindings
->get(index
, name
)) {
2706 var
->data
.index
= index
;
2711 /* If not, but it's an array type, look for name[0] */
2712 if (type
->is_array()) {
2713 name
= ralloc_asprintf(mem_ctx
, "%s[0]", name
);
2714 type
= type
->fields
.array
;
2722 if (strcmp(var
->name
, "gl_LastFragData") == 0)
2725 /* From GL4.5 core spec, section 15.2 (Shader Execution):
2727 * "Output binding assignments will cause LinkProgram to fail:
2729 * If the program has an active output assigned to a location greater
2730 * than or equal to the value of MAX_DUAL_SOURCE_DRAW_BUFFERS and has
2731 * an active output assigned an index greater than or equal to one;"
2733 if (target_index
== MESA_SHADER_FRAGMENT
&& var
->data
.index
>= 1 &&
2734 var
->data
.location
- generic_base
>=
2735 (int) constants
->MaxDualSourceDrawBuffers
) {
2737 "output location %d >= GL_MAX_DUAL_SOURCE_DRAW_BUFFERS "
2738 "with index %u for %s\n",
2739 var
->data
.location
- generic_base
, var
->data
.index
,
2744 const unsigned slots
= var
->type
->count_attribute_slots(target_index
== MESA_SHADER_VERTEX
);
2746 /* If the variable is not a built-in and has a location statically
2747 * assigned in the shader (presumably via a layout qualifier), make sure
2748 * that it doesn't collide with other assigned locations. Otherwise,
2749 * add it to the list of variables that need linker-assigned locations.
2751 if (var
->data
.location
!= -1) {
2752 if (var
->data
.location
>= generic_base
&& var
->data
.index
< 1) {
2753 /* From page 61 of the OpenGL 4.0 spec:
2755 * "LinkProgram will fail if the attribute bindings assigned
2756 * by BindAttribLocation do not leave not enough space to
2757 * assign a location for an active matrix attribute or an
2758 * active attribute array, both of which require multiple
2759 * contiguous generic attributes."
2761 * I think above text prohibits the aliasing of explicit and
2762 * automatic assignments. But, aliasing is allowed in manual
2763 * assignments of attribute locations. See below comments for
2766 * From OpenGL 4.0 spec, page 61:
2768 * "It is possible for an application to bind more than one
2769 * attribute name to the same location. This is referred to as
2770 * aliasing. This will only work if only one of the aliased
2771 * attributes is active in the executable program, or if no
2772 * path through the shader consumes more than one attribute of
2773 * a set of attributes aliased to the same location. A link
2774 * error can occur if the linker determines that every path
2775 * through the shader consumes multiple aliased attributes,
2776 * but implementations are not required to generate an error
2779 * From GLSL 4.30 spec, page 54:
2781 * "A program will fail to link if any two non-vertex shader
2782 * input variables are assigned to the same location. For
2783 * vertex shaders, multiple input variables may be assigned
2784 * to the same location using either layout qualifiers or via
2785 * the OpenGL API. However, such aliasing is intended only to
2786 * support vertex shaders where each execution path accesses
2787 * at most one input per each location. Implementations are
2788 * permitted, but not required, to generate link-time errors
2789 * if they detect that every path through the vertex shader
2790 * executable accesses multiple inputs assigned to any single
2791 * location. For all shader types, a program will fail to link
2792 * if explicit location assignments leave the linker unable
2793 * to find space for other variables without explicit
2796 * From OpenGL ES 3.0 spec, page 56:
2798 * "Binding more than one attribute name to the same location
2799 * is referred to as aliasing, and is not permitted in OpenGL
2800 * ES Shading Language 3.00 vertex shaders. LinkProgram will
2801 * fail when this condition exists. However, aliasing is
2802 * possible in OpenGL ES Shading Language 1.00 vertex shaders.
2803 * This will only work if only one of the aliased attributes
2804 * is active in the executable program, or if no path through
2805 * the shader consumes more than one attribute of a set of
2806 * attributes aliased to the same location. A link error can
2807 * occur if the linker determines that every path through the
2808 * shader consumes multiple aliased attributes, but implemen-
2809 * tations are not required to generate an error in this case."
2811 * After looking at above references from OpenGL, OpenGL ES and
2812 * GLSL specifications, we allow aliasing of vertex input variables
2813 * in: OpenGL 2.0 (and above) and OpenGL ES 2.0.
2815 * NOTE: This is not required by the spec but its worth mentioning
2816 * here that we're not doing anything to make sure that no path
2817 * through the vertex shader executable accesses multiple inputs
2818 * assigned to any single location.
2821 /* Mask representing the contiguous slots that will be used by
2824 const unsigned attr
= var
->data
.location
- generic_base
;
2825 const unsigned use_mask
= (1 << slots
) - 1;
2826 const char *const string
= (target_index
== MESA_SHADER_VERTEX
)
2827 ? "vertex shader input" : "fragment shader output";
2829 /* Generate a link error if the requested locations for this
2830 * attribute exceed the maximum allowed attribute location.
2832 if (attr
+ slots
> max_index
) {
2834 "insufficient contiguous locations "
2835 "available for %s `%s' %d %d %d\n", string
,
2836 var
->name
, used_locations
, use_mask
, attr
);
2840 /* Generate a link error if the set of bits requested for this
2841 * attribute overlaps any previously allocated bits.
2843 if ((~(use_mask
<< attr
) & used_locations
) != used_locations
) {
2844 if (target_index
== MESA_SHADER_FRAGMENT
&& !prog
->IsES
) {
2845 /* From section 4.4.2 (Output Layout Qualifiers) of the GLSL
2848 * "Additionally, for fragment shader outputs, if two
2849 * variables are placed within the same location, they
2850 * must have the same underlying type (floating-point or
2851 * integer). No component aliasing of output variables or
2852 * members is allowed.
2854 for (unsigned i
= 0; i
< assigned_attr
; i
++) {
2855 unsigned assigned_slots
=
2856 assigned
[i
]->type
->count_attribute_slots(false);
2857 unsigned assig_attr
=
2858 assigned
[i
]->data
.location
- generic_base
;
2859 unsigned assigned_use_mask
= (1 << assigned_slots
) - 1;
2861 if ((assigned_use_mask
<< assig_attr
) &
2862 (use_mask
<< attr
)) {
2864 const glsl_type
*assigned_type
=
2865 assigned
[i
]->type
->without_array();
2866 const glsl_type
*type
= var
->type
->without_array();
2867 if (assigned_type
->base_type
!= type
->base_type
) {
2868 linker_error(prog
, "types do not match for aliased"
2869 " %ss %s and %s\n", string
,
2870 assigned
[i
]->name
, var
->name
);
2874 unsigned assigned_component_mask
=
2875 ((1 << assigned_type
->vector_elements
) - 1) <<
2876 assigned
[i
]->data
.location_frac
;
2877 unsigned component_mask
=
2878 ((1 << type
->vector_elements
) - 1) <<
2879 var
->data
.location_frac
;
2880 if (assigned_component_mask
& component_mask
) {
2881 linker_error(prog
, "overlapping component is "
2882 "assigned to %ss %s and %s "
2884 string
, assigned
[i
]->name
, var
->name
,
2885 var
->data
.location_frac
);
2890 } else if (target_index
== MESA_SHADER_FRAGMENT
||
2891 (prog
->IsES
&& prog
->data
->Version
>= 300)) {
2892 linker_error(prog
, "overlapping location is assigned "
2893 "to %s `%s' %d %d %d\n", string
, var
->name
,
2894 used_locations
, use_mask
, attr
);
2897 linker_warning(prog
, "overlapping location is assigned "
2898 "to %s `%s' %d %d %d\n", string
, var
->name
,
2899 used_locations
, use_mask
, attr
);
2903 if (target_index
== MESA_SHADER_FRAGMENT
&& !prog
->IsES
) {
2904 /* Only track assigned variables for non-ES fragment shaders
2905 * to avoid overflowing the array.
2907 * At most one variable per fragment output component should
2910 assert(assigned_attr
< ARRAY_SIZE(assigned
));
2911 assigned
[assigned_attr
] = var
;
2915 used_locations
|= (use_mask
<< attr
);
2917 /* From the GL 4.5 core spec, section 11.1.1 (Vertex Attributes):
2919 * "A program with more than the value of MAX_VERTEX_ATTRIBS
2920 * active attribute variables may fail to link, unless
2921 * device-dependent optimizations are able to make the program
2922 * fit within available hardware resources. For the purposes
2923 * of this test, attribute variables of the type dvec3, dvec4,
2924 * dmat2x3, dmat2x4, dmat3, dmat3x4, dmat4x3, and dmat4 may
2925 * count as consuming twice as many attributes as equivalent
2926 * single-precision types. While these types use the same number
2927 * of generic attributes as their single-precision equivalents,
2928 * implementations are permitted to consume two single-precision
2929 * vectors of internal storage for each three- or four-component
2930 * double-precision vector."
2932 * Mark this attribute slot as taking up twice as much space
2933 * so we can count it properly against limits. According to
2934 * issue (3) of the GL_ARB_vertex_attrib_64bit behavior, this
2935 * is optional behavior, but it seems preferable.
2937 if (var
->type
->without_array()->is_dual_slot())
2938 double_storage_locations
|= (use_mask
<< attr
);
2944 if (num_attr
>= max_index
) {
2945 linker_error(prog
, "too many %s (max %u)",
2946 target_index
== MESA_SHADER_VERTEX
?
2947 "vertex shader inputs" : "fragment shader outputs",
2951 to_assign
[num_attr
].slots
= slots
;
2952 to_assign
[num_attr
].var
= var
;
2956 if (target_index
== MESA_SHADER_VERTEX
) {
2957 unsigned total_attribs_size
=
2958 _mesa_bitcount(used_locations
& ((1 << max_index
) - 1)) +
2959 _mesa_bitcount(double_storage_locations
);
2960 if (total_attribs_size
> max_index
) {
2962 "attempt to use %d vertex attribute slots only %d available ",
2963 total_attribs_size
, max_index
);
2968 /* If all of the attributes were assigned locations by the application (or
2969 * are built-in attributes with fixed locations), return early. This should
2970 * be the common case.
2975 qsort(to_assign
, num_attr
, sizeof(to_assign
[0]), temp_attr::compare
);
2977 if (target_index
== MESA_SHADER_VERTEX
) {
2978 /* VERT_ATTRIB_GENERIC0 is a pseudo-alias for VERT_ATTRIB_POS. It can
2979 * only be explicitly assigned by via glBindAttribLocation. Mark it as
2980 * reserved to prevent it from being automatically allocated below.
2982 find_deref_visitor
find("gl_Vertex");
2984 if (find
.variable_found())
2985 used_locations
|= (1 << 0);
2988 for (unsigned i
= 0; i
< num_attr
; i
++) {
2989 /* Mask representing the contiguous slots that will be used by this
2992 const unsigned use_mask
= (1 << to_assign
[i
].slots
) - 1;
2994 int location
= find_available_slots(used_locations
, to_assign
[i
].slots
);
2997 const char *const string
= (target_index
== MESA_SHADER_VERTEX
)
2998 ? "vertex shader input" : "fragment shader output";
3001 "insufficient contiguous locations "
3002 "available for %s `%s'\n",
3003 string
, to_assign
[i
].var
->name
);
3007 to_assign
[i
].var
->data
.location
= generic_base
+ location
;
3008 to_assign
[i
].var
->data
.is_unmatched_generic_inout
= 0;
3009 used_locations
|= (use_mask
<< location
);
3011 if (to_assign
[i
].var
->type
->without_array()->is_dual_slot())
3012 double_storage_locations
|= (use_mask
<< location
);
3015 /* Now that we have all the locations, from the GL 4.5 core spec, section
3016 * 11.1.1 (Vertex Attributes), dvec3, dvec4, dmat2x3, dmat2x4, dmat3,
3017 * dmat3x4, dmat4x3, and dmat4 count as consuming twice as many attributes
3018 * as equivalent single-precision types.
3020 if (target_index
== MESA_SHADER_VERTEX
) {
3021 unsigned total_attribs_size
=
3022 _mesa_bitcount(used_locations
& ((1 << max_index
) - 1)) +
3023 _mesa_bitcount(double_storage_locations
);
3024 if (total_attribs_size
> max_index
) {
3026 "attempt to use %d vertex attribute slots only %d available ",
3027 total_attribs_size
, max_index
);
3036 * Match explicit locations of outputs to inputs and deactivate the
3037 * unmatch flag if found so we don't optimise them away.
3040 match_explicit_outputs_to_inputs(gl_linked_shader
*producer
,
3041 gl_linked_shader
*consumer
)
3043 glsl_symbol_table parameters
;
3044 ir_variable
*explicit_locations
[MAX_VARYINGS_INCL_PATCH
][4] =
3047 /* Find all shader outputs in the "producer" stage.
3049 foreach_in_list(ir_instruction
, node
, producer
->ir
) {
3050 ir_variable
*const var
= node
->as_variable();
3052 if ((var
== NULL
) || (var
->data
.mode
!= ir_var_shader_out
))
3055 if (var
->data
.explicit_location
&&
3056 var
->data
.location
>= VARYING_SLOT_VAR0
) {
3057 const unsigned idx
= var
->data
.location
- VARYING_SLOT_VAR0
;
3058 if (explicit_locations
[idx
][var
->data
.location_frac
] == NULL
)
3059 explicit_locations
[idx
][var
->data
.location_frac
] = var
;
3063 /* Match inputs to outputs */
3064 foreach_in_list(ir_instruction
, node
, consumer
->ir
) {
3065 ir_variable
*const input
= node
->as_variable();
3067 if ((input
== NULL
) || (input
->data
.mode
!= ir_var_shader_in
))
3070 ir_variable
*output
= NULL
;
3071 if (input
->data
.explicit_location
3072 && input
->data
.location
>= VARYING_SLOT_VAR0
) {
3073 output
= explicit_locations
[input
->data
.location
- VARYING_SLOT_VAR0
]
3074 [input
->data
.location_frac
];
3076 if (output
!= NULL
){
3077 input
->data
.is_unmatched_generic_inout
= 0;
3078 output
->data
.is_unmatched_generic_inout
= 0;
3085 * Store the gl_FragDepth layout in the gl_shader_program struct.
3088 store_fragdepth_layout(struct gl_shader_program
*prog
)
3090 if (prog
->_LinkedShaders
[MESA_SHADER_FRAGMENT
] == NULL
) {
3094 struct exec_list
*ir
= prog
->_LinkedShaders
[MESA_SHADER_FRAGMENT
]->ir
;
3096 /* We don't look up the gl_FragDepth symbol directly because if
3097 * gl_FragDepth is not used in the shader, it's removed from the IR.
3098 * However, the symbol won't be removed from the symbol table.
3100 * We're only interested in the cases where the variable is NOT removed
3103 foreach_in_list(ir_instruction
, node
, ir
) {
3104 ir_variable
*const var
= node
->as_variable();
3106 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
) {
3110 if (strcmp(var
->name
, "gl_FragDepth") == 0) {
3111 switch (var
->data
.depth_layout
) {
3112 case ir_depth_layout_none
:
3113 prog
->FragDepthLayout
= FRAG_DEPTH_LAYOUT_NONE
;
3115 case ir_depth_layout_any
:
3116 prog
->FragDepthLayout
= FRAG_DEPTH_LAYOUT_ANY
;
3118 case ir_depth_layout_greater
:
3119 prog
->FragDepthLayout
= FRAG_DEPTH_LAYOUT_GREATER
;
3121 case ir_depth_layout_less
:
3122 prog
->FragDepthLayout
= FRAG_DEPTH_LAYOUT_LESS
;
3124 case ir_depth_layout_unchanged
:
3125 prog
->FragDepthLayout
= FRAG_DEPTH_LAYOUT_UNCHANGED
;
3136 * Validate the resources used by a program versus the implementation limits
3139 check_resources(struct gl_context
*ctx
, struct gl_shader_program
*prog
)
3141 unsigned total_uniform_blocks
= 0;
3142 unsigned total_shader_storage_blocks
= 0;
3144 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
3145 struct gl_linked_shader
*sh
= prog
->_LinkedShaders
[i
];
3150 if (sh
->Program
->info
.num_textures
>
3151 ctx
->Const
.Program
[i
].MaxTextureImageUnits
) {
3152 linker_error(prog
, "Too many %s shader texture samplers\n",
3153 _mesa_shader_stage_to_string(i
));
3156 if (sh
->num_uniform_components
>
3157 ctx
->Const
.Program
[i
].MaxUniformComponents
) {
3158 if (ctx
->Const
.GLSLSkipStrictMaxUniformLimitCheck
) {
3159 linker_warning(prog
, "Too many %s shader default uniform block "
3160 "components, but the driver will try to optimize "
3161 "them out; this is non-portable out-of-spec "
3163 _mesa_shader_stage_to_string(i
));
3165 linker_error(prog
, "Too many %s shader default uniform block "
3167 _mesa_shader_stage_to_string(i
));
3171 if (sh
->num_combined_uniform_components
>
3172 ctx
->Const
.Program
[i
].MaxCombinedUniformComponents
) {
3173 if (ctx
->Const
.GLSLSkipStrictMaxUniformLimitCheck
) {
3174 linker_warning(prog
, "Too many %s shader uniform components, "
3175 "but the driver will try to optimize them out; "
3176 "this is non-portable out-of-spec behavior\n",
3177 _mesa_shader_stage_to_string(i
));
3179 linker_error(prog
, "Too many %s shader uniform components\n",
3180 _mesa_shader_stage_to_string(i
));
3184 total_shader_storage_blocks
+= sh
->Program
->info
.num_ssbos
;
3185 total_uniform_blocks
+= sh
->Program
->info
.num_ubos
;
3187 const unsigned max_uniform_blocks
=
3188 ctx
->Const
.Program
[i
].MaxUniformBlocks
;
3189 if (max_uniform_blocks
< sh
->Program
->info
.num_ubos
) {
3190 linker_error(prog
, "Too many %s uniform blocks (%d/%d)\n",
3191 _mesa_shader_stage_to_string(i
),
3192 sh
->Program
->info
.num_ubos
, max_uniform_blocks
);
3195 const unsigned max_shader_storage_blocks
=
3196 ctx
->Const
.Program
[i
].MaxShaderStorageBlocks
;
3197 if (max_shader_storage_blocks
< sh
->Program
->info
.num_ssbos
) {
3198 linker_error(prog
, "Too many %s shader storage blocks (%d/%d)\n",
3199 _mesa_shader_stage_to_string(i
),
3200 sh
->Program
->info
.num_ssbos
, max_shader_storage_blocks
);
3204 if (total_uniform_blocks
> ctx
->Const
.MaxCombinedUniformBlocks
) {
3205 linker_error(prog
, "Too many combined uniform blocks (%d/%d)\n",
3206 total_uniform_blocks
, ctx
->Const
.MaxCombinedUniformBlocks
);
3209 if (total_shader_storage_blocks
> ctx
->Const
.MaxCombinedShaderStorageBlocks
) {
3210 linker_error(prog
, "Too many combined shader storage blocks (%d/%d)\n",
3211 total_shader_storage_blocks
,
3212 ctx
->Const
.MaxCombinedShaderStorageBlocks
);
3215 for (unsigned i
= 0; i
< prog
->data
->NumUniformBlocks
; i
++) {
3216 if (prog
->data
->UniformBlocks
[i
].UniformBufferSize
>
3217 ctx
->Const
.MaxUniformBlockSize
) {
3218 linker_error(prog
, "Uniform block %s too big (%d/%d)\n",
3219 prog
->data
->UniformBlocks
[i
].Name
,
3220 prog
->data
->UniformBlocks
[i
].UniformBufferSize
,
3221 ctx
->Const
.MaxUniformBlockSize
);
3225 for (unsigned i
= 0; i
< prog
->data
->NumShaderStorageBlocks
; i
++) {
3226 if (prog
->data
->ShaderStorageBlocks
[i
].UniformBufferSize
>
3227 ctx
->Const
.MaxShaderStorageBlockSize
) {
3228 linker_error(prog
, "Shader storage block %s too big (%d/%d)\n",
3229 prog
->data
->ShaderStorageBlocks
[i
].Name
,
3230 prog
->data
->ShaderStorageBlocks
[i
].UniformBufferSize
,
3231 ctx
->Const
.MaxShaderStorageBlockSize
);
3237 link_calculate_subroutine_compat(struct gl_shader_program
*prog
)
3239 unsigned mask
= prog
->data
->linked_stages
;
3241 const int i
= u_bit_scan(&mask
);
3242 struct gl_program
*p
= prog
->_LinkedShaders
[i
]->Program
;
3244 for (unsigned j
= 0; j
< p
->sh
.NumSubroutineUniformRemapTable
; j
++) {
3245 if (p
->sh
.SubroutineUniformRemapTable
[j
] == INACTIVE_UNIFORM_EXPLICIT_LOCATION
)
3248 struct gl_uniform_storage
*uni
= p
->sh
.SubroutineUniformRemapTable
[j
];
3254 if (p
->sh
.NumSubroutineFunctions
== 0) {
3255 linker_error(prog
, "subroutine uniform %s defined but no valid functions found\n", uni
->type
->name
);
3258 for (unsigned f
= 0; f
< p
->sh
.NumSubroutineFunctions
; f
++) {
3259 struct gl_subroutine_function
*fn
= &p
->sh
.SubroutineFunctions
[f
];
3260 for (int k
= 0; k
< fn
->num_compat_types
; k
++) {
3261 if (fn
->types
[k
] == uni
->type
) {
3267 uni
->num_compatible_subroutines
= count
;
3273 check_subroutine_resources(struct gl_shader_program
*prog
)
3275 unsigned mask
= prog
->data
->linked_stages
;
3277 const int i
= u_bit_scan(&mask
);
3278 struct gl_program
*p
= prog
->_LinkedShaders
[i
]->Program
;
3280 if (p
->sh
.NumSubroutineUniformRemapTable
> MAX_SUBROUTINE_UNIFORM_LOCATIONS
) {
3281 linker_error(prog
, "Too many %s shader subroutine uniforms\n",
3282 _mesa_shader_stage_to_string(i
));
3287 * Validate shader image resources.
3290 check_image_resources(struct gl_context
*ctx
, struct gl_shader_program
*prog
)
3292 unsigned total_image_units
= 0;
3293 unsigned fragment_outputs
= 0;
3294 unsigned total_shader_storage_blocks
= 0;
3296 if (!ctx
->Extensions
.ARB_shader_image_load_store
)
3299 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
3300 struct gl_linked_shader
*sh
= prog
->_LinkedShaders
[i
];
3303 if (sh
->Program
->info
.num_images
> ctx
->Const
.Program
[i
].MaxImageUniforms
)
3304 linker_error(prog
, "Too many %s shader image uniforms (%u > %u)\n",
3305 _mesa_shader_stage_to_string(i
),
3306 sh
->Program
->info
.num_images
,
3307 ctx
->Const
.Program
[i
].MaxImageUniforms
);
3309 total_image_units
+= sh
->Program
->info
.num_images
;
3310 total_shader_storage_blocks
+= sh
->Program
->info
.num_ssbos
;
3312 if (i
== MESA_SHADER_FRAGMENT
) {
3313 foreach_in_list(ir_instruction
, node
, sh
->ir
) {
3314 ir_variable
*var
= node
->as_variable();
3315 if (var
&& var
->data
.mode
== ir_var_shader_out
)
3316 /* since there are no double fs outputs - pass false */
3317 fragment_outputs
+= var
->type
->count_attribute_slots(false);
3323 if (total_image_units
> ctx
->Const
.MaxCombinedImageUniforms
)
3324 linker_error(prog
, "Too many combined image uniforms\n");
3326 if (total_image_units
+ fragment_outputs
+ total_shader_storage_blocks
>
3327 ctx
->Const
.MaxCombinedShaderOutputResources
)
3328 linker_error(prog
, "Too many combined image uniforms, shader storage "
3329 " buffers and fragment outputs\n");
3334 * Initializes explicit location slots to INACTIVE_UNIFORM_EXPLICIT_LOCATION
3335 * for a variable, checks for overlaps between other uniforms using explicit
3339 reserve_explicit_locations(struct gl_shader_program
*prog
,
3340 string_to_uint_map
*map
, ir_variable
*var
)
3342 unsigned slots
= var
->type
->uniform_locations();
3343 unsigned max_loc
= var
->data
.location
+ slots
- 1;
3344 unsigned return_value
= slots
;
3346 /* Resize remap table if locations do not fit in the current one. */
3347 if (max_loc
+ 1 > prog
->NumUniformRemapTable
) {
3348 prog
->UniformRemapTable
=
3349 reralloc(prog
, prog
->UniformRemapTable
,
3350 gl_uniform_storage
*,
3353 if (!prog
->UniformRemapTable
) {
3354 linker_error(prog
, "Out of memory during linking.\n");
3358 /* Initialize allocated space. */
3359 for (unsigned i
= prog
->NumUniformRemapTable
; i
< max_loc
+ 1; i
++)
3360 prog
->UniformRemapTable
[i
] = NULL
;
3362 prog
->NumUniformRemapTable
= max_loc
+ 1;
3365 for (unsigned i
= 0; i
< slots
; i
++) {
3366 unsigned loc
= var
->data
.location
+ i
;
3368 /* Check if location is already used. */
3369 if (prog
->UniformRemapTable
[loc
] == INACTIVE_UNIFORM_EXPLICIT_LOCATION
) {
3371 /* Possibly same uniform from a different stage, this is ok. */
3373 if (map
->get(hash_loc
, var
->name
) && hash_loc
== loc
- i
) {
3378 /* ARB_explicit_uniform_location specification states:
3380 * "No two default-block uniform variables in the program can have
3381 * the same location, even if they are unused, otherwise a compiler
3382 * or linker error will be generated."
3385 "location qualifier for uniform %s overlaps "
3386 "previously used location\n",
3391 /* Initialize location as inactive before optimization
3392 * rounds and location assignment.
3394 prog
->UniformRemapTable
[loc
] = INACTIVE_UNIFORM_EXPLICIT_LOCATION
;
3397 /* Note, base location used for arrays. */
3398 map
->put(var
->data
.location
, var
->name
);
3400 return return_value
;
3404 reserve_subroutine_explicit_locations(struct gl_shader_program
*prog
,
3405 struct gl_program
*p
,
3408 unsigned slots
= var
->type
->uniform_locations();
3409 unsigned max_loc
= var
->data
.location
+ slots
- 1;
3411 /* Resize remap table if locations do not fit in the current one. */
3412 if (max_loc
+ 1 > p
->sh
.NumSubroutineUniformRemapTable
) {
3413 p
->sh
.SubroutineUniformRemapTable
=
3414 reralloc(p
, p
->sh
.SubroutineUniformRemapTable
,
3415 gl_uniform_storage
*,
3418 if (!p
->sh
.SubroutineUniformRemapTable
) {
3419 linker_error(prog
, "Out of memory during linking.\n");
3423 /* Initialize allocated space. */
3424 for (unsigned i
= p
->sh
.NumSubroutineUniformRemapTable
; i
< max_loc
+ 1; i
++)
3425 p
->sh
.SubroutineUniformRemapTable
[i
] = NULL
;
3427 p
->sh
.NumSubroutineUniformRemapTable
= max_loc
+ 1;
3430 for (unsigned i
= 0; i
< slots
; i
++) {
3431 unsigned loc
= var
->data
.location
+ i
;
3433 /* Check if location is already used. */
3434 if (p
->sh
.SubroutineUniformRemapTable
[loc
] == INACTIVE_UNIFORM_EXPLICIT_LOCATION
) {
3436 /* ARB_explicit_uniform_location specification states:
3437 * "No two subroutine uniform variables can have the same location
3438 * in the same shader stage, otherwise a compiler or linker error
3439 * will be generated."
3442 "location qualifier for uniform %s overlaps "
3443 "previously used location\n",
3448 /* Initialize location as inactive before optimization
3449 * rounds and location assignment.
3451 p
->sh
.SubroutineUniformRemapTable
[loc
] = INACTIVE_UNIFORM_EXPLICIT_LOCATION
;
3457 * Check and reserve all explicit uniform locations, called before
3458 * any optimizations happen to handle also inactive uniforms and
3459 * inactive array elements that may get trimmed away.
3462 check_explicit_uniform_locations(struct gl_context
*ctx
,
3463 struct gl_shader_program
*prog
)
3465 prog
->NumExplicitUniformLocations
= 0;
3467 if (!ctx
->Extensions
.ARB_explicit_uniform_location
)
3470 /* This map is used to detect if overlapping explicit locations
3471 * occur with the same uniform (from different stage) or a different one.
3473 string_to_uint_map
*uniform_map
= new string_to_uint_map
;
3476 linker_error(prog
, "Out of memory during linking.\n");
3480 unsigned entries_total
= 0;
3481 unsigned mask
= prog
->data
->linked_stages
;
3483 const int i
= u_bit_scan(&mask
);
3484 struct gl_program
*p
= prog
->_LinkedShaders
[i
]->Program
;
3486 foreach_in_list(ir_instruction
, node
, prog
->_LinkedShaders
[i
]->ir
) {
3487 ir_variable
*var
= node
->as_variable();
3488 if (!var
|| var
->data
.mode
!= ir_var_uniform
)
3491 if (var
->data
.explicit_location
) {
3493 if (var
->type
->without_array()->is_subroutine())
3494 ret
= reserve_subroutine_explicit_locations(prog
, p
, var
);
3496 int slots
= reserve_explicit_locations(prog
, uniform_map
,
3500 entries_total
+= slots
;
3511 struct empty_uniform_block
*current_block
= NULL
;
3513 for (unsigned i
= 0; i
< prog
->NumUniformRemapTable
; i
++) {
3514 /* We found empty space in UniformRemapTable. */
3515 if (prog
->UniformRemapTable
[i
] == NULL
) {
3516 /* We've found the beginning of a new continous block of empty slots */
3517 if (!current_block
|| current_block
->start
+ current_block
->slots
!= i
) {
3518 current_block
= rzalloc(prog
, struct empty_uniform_block
);
3519 current_block
->start
= i
;
3520 exec_list_push_tail(&prog
->EmptyUniformLocations
,
3521 ¤t_block
->link
);
3524 /* The current block continues, so we simply increment its slots */
3525 current_block
->slots
++;
3530 prog
->NumExplicitUniformLocations
= entries_total
;
3534 should_add_buffer_variable(struct gl_shader_program
*shProg
,
3535 GLenum type
, const char *name
)
3537 bool found_interface
= false;
3538 unsigned block_name_len
= 0;
3539 const char *block_name_dot
= strchr(name
, '.');
3541 /* These rules only apply to buffer variables. So we return
3542 * true for the rest of types.
3544 if (type
!= GL_BUFFER_VARIABLE
)
3547 for (unsigned i
= 0; i
< shProg
->data
->NumShaderStorageBlocks
; i
++) {
3548 const char *block_name
= shProg
->data
->ShaderStorageBlocks
[i
].Name
;
3549 block_name_len
= strlen(block_name
);
3551 const char *block_square_bracket
= strchr(block_name
, '[');
3552 if (block_square_bracket
) {
3553 /* The block is part of an array of named interfaces,
3554 * for the name comparison we ignore the "[x]" part.
3556 block_name_len
-= strlen(block_square_bracket
);
3559 if (block_name_dot
) {
3560 /* Check if the variable name starts with the interface
3561 * name. The interface name (if present) should have the
3562 * length than the interface block name we are comparing to.
3564 unsigned len
= strlen(name
) - strlen(block_name_dot
);
3565 if (len
!= block_name_len
)
3569 if (strncmp(block_name
, name
, block_name_len
) == 0) {
3570 found_interface
= true;
3575 /* We remove the interface name from the buffer variable name,
3576 * including the dot that follows it.
3578 if (found_interface
)
3579 name
= name
+ block_name_len
+ 1;
3581 /* The ARB_program_interface_query spec says:
3583 * "For an active shader storage block member declared as an array, an
3584 * entry will be generated only for the first array element, regardless
3585 * of its type. For arrays of aggregate types, the enumeration rules
3586 * are applied recursively for the single enumerated array element."
3588 const char *struct_first_dot
= strchr(name
, '.');
3589 const char *first_square_bracket
= strchr(name
, '[');
3591 /* The buffer variable is on top level and it is not an array */
3592 if (!first_square_bracket
) {
3594 /* The shader storage block member is a struct, then generate the entry */
3595 } else if (struct_first_dot
&& struct_first_dot
< first_square_bracket
) {
3598 /* Shader storage block member is an array, only generate an entry for the
3599 * first array element.
3601 if (strncmp(first_square_bracket
, "[0]", 3) == 0)
3609 add_program_resource(struct gl_shader_program
*prog
,
3610 struct set
*resource_set
,
3611 GLenum type
, const void *data
, uint8_t stages
)
3615 /* If resource already exists, do not add it again. */
3616 if (_mesa_set_search(resource_set
, data
))
3619 prog
->data
->ProgramResourceList
=
3621 prog
->data
->ProgramResourceList
,
3622 gl_program_resource
,
3623 prog
->data
->NumProgramResourceList
+ 1);
3625 if (!prog
->data
->ProgramResourceList
) {
3626 linker_error(prog
, "Out of memory during linking.\n");
3630 struct gl_program_resource
*res
=
3631 &prog
->data
->ProgramResourceList
[prog
->data
->NumProgramResourceList
];
3635 res
->StageReferences
= stages
;
3637 prog
->data
->NumProgramResourceList
++;
3639 _mesa_set_add(resource_set
, data
);
3644 /* Function checks if a variable var is a packed varying and
3645 * if given name is part of packed varying's list.
3647 * If a variable is a packed varying, it has a name like
3648 * 'packed:a,b,c' where a, b and c are separate variables.
3651 included_in_packed_varying(ir_variable
*var
, const char *name
)
3653 if (strncmp(var
->name
, "packed:", 7) != 0)
3656 char *list
= strdup(var
->name
+ 7);
3661 char *token
= strtok_r(list
, ",", &saveptr
);
3663 if (strcmp(token
, name
) == 0) {
3667 token
= strtok_r(NULL
, ",", &saveptr
);
3674 * Function builds a stage reference bitmask from variable name.
3677 build_stageref(struct gl_shader_program
*shProg
, const char *name
,
3682 /* Note, that we assume MAX 8 stages, if there will be more stages, type
3683 * used for reference mask in gl_program_resource will need to be changed.
3685 assert(MESA_SHADER_STAGES
< 8);
3687 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
3688 struct gl_linked_shader
*sh
= shProg
->_LinkedShaders
[i
];
3692 /* Shader symbol table may contain variables that have
3693 * been optimized away. Search IR for the variable instead.
3695 foreach_in_list(ir_instruction
, node
, sh
->ir
) {
3696 ir_variable
*var
= node
->as_variable();
3698 unsigned baselen
= strlen(var
->name
);
3700 if (included_in_packed_varying(var
, name
)) {
3705 /* Type needs to match if specified, otherwise we might
3706 * pick a variable with same name but different interface.
3708 if (var
->data
.mode
!= mode
)
3711 if (strncmp(var
->name
, name
, baselen
) == 0) {
3712 /* Check for exact name matches but also check for arrays and
3715 if (name
[baselen
] == '\0' ||
3716 name
[baselen
] == '[' ||
3717 name
[baselen
] == '.') {
3729 * Create gl_shader_variable from ir_variable class.
3731 static gl_shader_variable
*
3732 create_shader_variable(struct gl_shader_program
*shProg
,
3733 const ir_variable
*in
,
3734 const char *name
, const glsl_type
*type
,
3735 const glsl_type
*interface_type
,
3736 bool use_implicit_location
, int location
,
3737 const glsl_type
*outermost_struct_type
)
3739 /* Allocate zero-initialized memory to ensure that bitfield padding
3742 gl_shader_variable
*out
= rzalloc(shProg
, struct gl_shader_variable
);
3746 /* Since gl_VertexID may be lowered to gl_VertexIDMESA, but applications
3747 * expect to see gl_VertexID in the program resource list. Pretend.
3749 if (in
->data
.mode
== ir_var_system_value
&&
3750 in
->data
.location
== SYSTEM_VALUE_VERTEX_ID_ZERO_BASE
) {
3751 out
->name
= ralloc_strdup(shProg
, "gl_VertexID");
3752 } else if ((in
->data
.mode
== ir_var_shader_out
&&
3753 in
->data
.location
== VARYING_SLOT_TESS_LEVEL_OUTER
) ||
3754 (in
->data
.mode
== ir_var_system_value
&&
3755 in
->data
.location
== SYSTEM_VALUE_TESS_LEVEL_OUTER
)) {
3756 out
->name
= ralloc_strdup(shProg
, "gl_TessLevelOuter");
3757 type
= glsl_type::get_array_instance(glsl_type::float_type
, 4);
3758 } else if ((in
->data
.mode
== ir_var_shader_out
&&
3759 in
->data
.location
== VARYING_SLOT_TESS_LEVEL_INNER
) ||
3760 (in
->data
.mode
== ir_var_system_value
&&
3761 in
->data
.location
== SYSTEM_VALUE_TESS_LEVEL_INNER
)) {
3762 out
->name
= ralloc_strdup(shProg
, "gl_TessLevelInner");
3763 type
= glsl_type::get_array_instance(glsl_type::float_type
, 2);
3765 out
->name
= ralloc_strdup(shProg
, name
);
3771 /* The ARB_program_interface_query spec says:
3773 * "Not all active variables are assigned valid locations; the
3774 * following variables will have an effective location of -1:
3776 * * uniforms declared as atomic counters;
3778 * * members of a uniform block;
3780 * * built-in inputs, outputs, and uniforms (starting with "gl_"); and
3782 * * inputs or outputs not declared with a "location" layout
3783 * qualifier, except for vertex shader inputs and fragment shader
3786 if (in
->type
->is_atomic_uint() || is_gl_identifier(in
->name
) ||
3787 !(in
->data
.explicit_location
|| use_implicit_location
)) {
3790 out
->location
= location
;
3794 out
->outermost_struct_type
= outermost_struct_type
;
3795 out
->interface_type
= interface_type
;
3796 out
->component
= in
->data
.location_frac
;
3797 out
->index
= in
->data
.index
;
3798 out
->patch
= in
->data
.patch
;
3799 out
->mode
= in
->data
.mode
;
3800 out
->interpolation
= in
->data
.interpolation
;
3801 out
->explicit_location
= in
->data
.explicit_location
;
3802 out
->precision
= in
->data
.precision
;
3808 add_shader_variable(const struct gl_context
*ctx
,
3809 struct gl_shader_program
*shProg
,
3810 struct set
*resource_set
,
3811 unsigned stage_mask
,
3812 GLenum programInterface
, ir_variable
*var
,
3813 const char *name
, const glsl_type
*type
,
3814 bool use_implicit_location
, int location
,
3815 const glsl_type
*outermost_struct_type
= NULL
)
3817 const glsl_type
*interface_type
= var
->get_interface_type();
3819 if (outermost_struct_type
== NULL
) {
3820 if (var
->data
.from_named_ifc_block
) {
3821 const char *interface_name
= interface_type
->name
;
3823 if (interface_type
->is_array()) {
3824 /* Issue #16 of the ARB_program_interface_query spec says:
3826 * "* If a variable is a member of an interface block without an
3827 * instance name, it is enumerated using just the variable name.
3829 * * If a variable is a member of an interface block with an
3830 * instance name, it is enumerated as "BlockName.Member", where
3831 * "BlockName" is the name of the interface block (not the
3832 * instance name) and "Member" is the name of the variable."
3834 * In particular, it indicates that it should be "BlockName",
3835 * not "BlockName[array length]". The conformance suite and
3836 * dEQP both require this behavior.
3838 * Here, we unwrap the extra array level added by named interface
3839 * block array lowering so we have the correct variable type. We
3840 * also unwrap the interface type when constructing the name.
3842 * We leave interface_type the same so that ES 3.x SSO pipeline
3843 * validation can enforce the rules requiring array length to
3844 * match on interface blocks.
3846 type
= type
->fields
.array
;
3848 interface_name
= interface_type
->fields
.array
->name
;
3851 name
= ralloc_asprintf(shProg
, "%s.%s", interface_name
, name
);
3855 switch (type
->base_type
) {
3856 case GLSL_TYPE_STRUCT
: {
3857 /* The ARB_program_interface_query spec says:
3859 * "For an active variable declared as a structure, a separate entry
3860 * will be generated for each active structure member. The name of
3861 * each entry is formed by concatenating the name of the structure,
3862 * the "." character, and the name of the structure member. If a
3863 * structure member to enumerate is itself a structure or array,
3864 * these enumeration rules are applied recursively."
3866 if (outermost_struct_type
== NULL
)
3867 outermost_struct_type
= type
;
3869 unsigned field_location
= location
;
3870 for (unsigned i
= 0; i
< type
->length
; i
++) {
3871 const struct glsl_struct_field
*field
= &type
->fields
.structure
[i
];
3872 char *field_name
= ralloc_asprintf(shProg
, "%s.%s", name
, field
->name
);
3873 if (!add_shader_variable(ctx
, shProg
, resource_set
,
3874 stage_mask
, programInterface
,
3875 var
, field_name
, field
->type
,
3876 use_implicit_location
, field_location
,
3877 outermost_struct_type
))
3880 field_location
+= field
->type
->count_attribute_slots(false);
3886 /* The ARB_program_interface_query spec says:
3888 * "For an active variable declared as a single instance of a basic
3889 * type, a single entry will be generated, using the variable name
3890 * from the shader source."
3892 gl_shader_variable
*sha_v
=
3893 create_shader_variable(shProg
, var
, name
, type
, interface_type
,
3894 use_implicit_location
, location
,
3895 outermost_struct_type
);
3899 return add_program_resource(shProg
, resource_set
,
3900 programInterface
, sha_v
, stage_mask
);
3906 add_interface_variables(const struct gl_context
*ctx
,
3907 struct gl_shader_program
*shProg
,
3908 struct set
*resource_set
,
3909 unsigned stage
, GLenum programInterface
)
3911 exec_list
*ir
= shProg
->_LinkedShaders
[stage
]->ir
;
3913 foreach_in_list(ir_instruction
, node
, ir
) {
3914 ir_variable
*var
= node
->as_variable();
3916 if (!var
|| var
->data
.how_declared
== ir_var_hidden
)
3921 switch (var
->data
.mode
) {
3922 case ir_var_system_value
:
3923 case ir_var_shader_in
:
3924 if (programInterface
!= GL_PROGRAM_INPUT
)
3926 loc_bias
= (stage
== MESA_SHADER_VERTEX
) ? int(VERT_ATTRIB_GENERIC0
)
3927 : int(VARYING_SLOT_VAR0
);
3929 case ir_var_shader_out
:
3930 if (programInterface
!= GL_PROGRAM_OUTPUT
)
3932 loc_bias
= (stage
== MESA_SHADER_FRAGMENT
) ? int(FRAG_RESULT_DATA0
)
3933 : int(VARYING_SLOT_VAR0
);
3939 if (var
->data
.patch
)
3940 loc_bias
= int(VARYING_SLOT_PATCH0
);
3942 /* Skip packed varyings, packed varyings are handled separately
3943 * by add_packed_varyings.
3945 if (strncmp(var
->name
, "packed:", 7) == 0)
3948 /* Skip fragdata arrays, these are handled separately
3949 * by add_fragdata_arrays.
3951 if (strncmp(var
->name
, "gl_out_FragData", 15) == 0)
3954 const bool vs_input_or_fs_output
=
3955 (stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_in
) ||
3956 (stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_out
);
3958 if (!add_shader_variable(ctx
, shProg
, resource_set
,
3959 1 << stage
, programInterface
,
3960 var
, var
->name
, var
->type
, vs_input_or_fs_output
,
3961 var
->data
.location
- loc_bias
))
3968 add_packed_varyings(const struct gl_context
*ctx
,
3969 struct gl_shader_program
*shProg
,
3970 struct set
*resource_set
,
3971 int stage
, GLenum type
)
3973 struct gl_linked_shader
*sh
= shProg
->_LinkedShaders
[stage
];
3976 if (!sh
|| !sh
->packed_varyings
)
3979 foreach_in_list(ir_instruction
, node
, sh
->packed_varyings
) {
3980 ir_variable
*var
= node
->as_variable();
3982 switch (var
->data
.mode
) {
3983 case ir_var_shader_in
:
3984 iface
= GL_PROGRAM_INPUT
;
3986 case ir_var_shader_out
:
3987 iface
= GL_PROGRAM_OUTPUT
;
3990 unreachable("unexpected type");
3993 if (type
== iface
) {
3994 const int stage_mask
=
3995 build_stageref(shProg
, var
->name
, var
->data
.mode
);
3996 if (!add_shader_variable(ctx
, shProg
, resource_set
,
3998 iface
, var
, var
->name
, var
->type
, false,
3999 var
->data
.location
- VARYING_SLOT_VAR0
))
4008 add_fragdata_arrays(const struct gl_context
*ctx
,
4009 struct gl_shader_program
*shProg
,
4010 struct set
*resource_set
)
4012 struct gl_linked_shader
*sh
= shProg
->_LinkedShaders
[MESA_SHADER_FRAGMENT
];
4014 if (!sh
|| !sh
->fragdata_arrays
)
4017 foreach_in_list(ir_instruction
, node
, sh
->fragdata_arrays
) {
4018 ir_variable
*var
= node
->as_variable();
4020 assert(var
->data
.mode
== ir_var_shader_out
);
4022 if (!add_shader_variable(ctx
, shProg
, resource_set
,
4023 1 << MESA_SHADER_FRAGMENT
,
4024 GL_PROGRAM_OUTPUT
, var
, var
->name
, var
->type
,
4025 true, var
->data
.location
- FRAG_RESULT_DATA0
))
4033 get_top_level_name(const char *name
)
4035 const char *first_dot
= strchr(name
, '.');
4036 const char *first_square_bracket
= strchr(name
, '[');
4039 /* The ARB_program_interface_query spec says:
4041 * "For the property TOP_LEVEL_ARRAY_SIZE, a single integer identifying
4042 * the number of active array elements of the top-level shader storage
4043 * block member containing to the active variable is written to
4044 * <params>. If the top-level block member is not declared as an
4045 * array, the value one is written to <params>. If the top-level block
4046 * member is an array with no declared size, the value zero is written
4050 /* The buffer variable is on top level.*/
4051 if (!first_square_bracket
&& !first_dot
)
4052 name_size
= strlen(name
);
4053 else if ((!first_square_bracket
||
4054 (first_dot
&& first_dot
< first_square_bracket
)))
4055 name_size
= first_dot
- name
;
4057 name_size
= first_square_bracket
- name
;
4059 return strndup(name
, name_size
);
4063 get_var_name(const char *name
)
4065 const char *first_dot
= strchr(name
, '.');
4068 return strdup(name
);
4070 return strndup(first_dot
+1, strlen(first_dot
) - 1);
4074 is_top_level_shader_storage_block_member(const char* name
,
4075 const char* interface_name
,
4076 const char* field_name
)
4078 bool result
= false;
4080 /* If the given variable is already a top-level shader storage
4081 * block member, then return array_size = 1.
4082 * We could have two possibilities: if we have an instanced
4083 * shader storage block or not instanced.
4085 * For the first, we check create a name as it was in top level and
4086 * compare it with the real name. If they are the same, then
4087 * the variable is already at top-level.
4089 * Full instanced name is: interface name + '.' + var name +
4092 int name_length
= strlen(interface_name
) + 1 + strlen(field_name
) + 1;
4093 char *full_instanced_name
= (char *) calloc(name_length
, sizeof(char));
4094 if (!full_instanced_name
) {
4095 fprintf(stderr
, "%s: Cannot allocate space for name\n", __func__
);
4099 snprintf(full_instanced_name
, name_length
, "%s.%s",
4100 interface_name
, field_name
);
4102 /* Check if its top-level shader storage block member of an
4103 * instanced interface block, or of a unnamed interface block.
4105 if (strcmp(name
, full_instanced_name
) == 0 ||
4106 strcmp(name
, field_name
) == 0)
4109 free(full_instanced_name
);
4114 get_array_size(struct gl_uniform_storage
*uni
, const glsl_struct_field
*field
,
4115 char *interface_name
, char *var_name
)
4117 /* The ARB_program_interface_query spec says:
4119 * "For the property TOP_LEVEL_ARRAY_SIZE, a single integer identifying
4120 * the number of active array elements of the top-level shader storage
4121 * block member containing to the active variable is written to
4122 * <params>. If the top-level block member is not declared as an
4123 * array, the value one is written to <params>. If the top-level block
4124 * member is an array with no declared size, the value zero is written
4127 if (is_top_level_shader_storage_block_member(uni
->name
,
4131 else if (field
->type
->is_unsized_array())
4133 else if (field
->type
->is_array())
4134 return field
->type
->length
;
4140 get_array_stride(struct gl_context
*ctx
, struct gl_uniform_storage
*uni
,
4141 const glsl_type
*interface
, const glsl_struct_field
*field
,
4142 char *interface_name
, char *var_name
)
4144 /* The ARB_program_interface_query spec says:
4146 * "For the property TOP_LEVEL_ARRAY_STRIDE, a single integer
4147 * identifying the stride between array elements of the top-level
4148 * shader storage block member containing the active variable is
4149 * written to <params>. For top-level block members declared as
4150 * arrays, the value written is the difference, in basic machine units,
4151 * between the offsets of the active variable for consecutive elements
4152 * in the top-level array. For top-level block members not declared as
4153 * an array, zero is written to <params>."
4155 if (field
->type
->is_array()) {
4156 const enum glsl_matrix_layout matrix_layout
=
4157 glsl_matrix_layout(field
->matrix_layout
);
4158 bool row_major
= matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
4159 const glsl_type
*array_type
= field
->type
->fields
.array
;
4161 if (is_top_level_shader_storage_block_member(uni
->name
,
4166 if (GLSL_INTERFACE_PACKING_STD140
==
4168 get_internal_ifc_packing(ctx
->Const
.UseSTD430AsDefaultPacking
)) {
4169 if (array_type
->is_record() || array_type
->is_array())
4170 return glsl_align(array_type
->std140_size(row_major
), 16);
4172 return MAX2(array_type
->std140_base_alignment(row_major
), 16);
4174 return array_type
->std430_array_stride(row_major
);
4181 calculate_array_size_and_stride(struct gl_context
*ctx
,
4182 struct gl_shader_program
*shProg
,
4183 struct gl_uniform_storage
*uni
)
4185 int block_index
= uni
->block_index
;
4186 int array_size
= -1;
4187 int array_stride
= -1;
4188 char *var_name
= get_top_level_name(uni
->name
);
4189 char *interface_name
=
4190 get_top_level_name(uni
->is_shader_storage
?
4191 shProg
->data
->ShaderStorageBlocks
[block_index
].Name
:
4192 shProg
->data
->UniformBlocks
[block_index
].Name
);
4194 if (strcmp(var_name
, interface_name
) == 0) {
4195 /* Deal with instanced array of SSBOs */
4196 char *temp_name
= get_var_name(uni
->name
);
4198 linker_error(shProg
, "Out of memory during linking.\n");
4199 goto write_top_level_array_size_and_stride
;
4202 var_name
= get_top_level_name(temp_name
);
4205 linker_error(shProg
, "Out of memory during linking.\n");
4206 goto write_top_level_array_size_and_stride
;
4210 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
4211 const gl_linked_shader
*sh
= shProg
->_LinkedShaders
[i
];
4215 foreach_in_list(ir_instruction
, node
, sh
->ir
) {
4216 ir_variable
*var
= node
->as_variable();
4217 if (!var
|| !var
->get_interface_type() ||
4218 var
->data
.mode
!= ir_var_shader_storage
)
4221 const glsl_type
*interface
= var
->get_interface_type();
4223 if (strcmp(interface_name
, interface
->name
) != 0)
4226 for (unsigned i
= 0; i
< interface
->length
; i
++) {
4227 const glsl_struct_field
*field
= &interface
->fields
.structure
[i
];
4228 if (strcmp(field
->name
, var_name
) != 0)
4231 array_stride
= get_array_stride(ctx
, uni
, interface
, field
,
4232 interface_name
, var_name
);
4233 array_size
= get_array_size(uni
, field
, interface_name
, var_name
);
4234 goto write_top_level_array_size_and_stride
;
4238 write_top_level_array_size_and_stride
:
4239 free(interface_name
);
4241 uni
->top_level_array_stride
= array_stride
;
4242 uni
->top_level_array_size
= array_size
;
4246 * Builds up a list of program resources that point to existing
4250 build_program_resource_list(struct gl_context
*ctx
,
4251 struct gl_shader_program
*shProg
)
4253 /* Rebuild resource list. */
4254 if (shProg
->data
->ProgramResourceList
) {
4255 ralloc_free(shProg
->data
->ProgramResourceList
);
4256 shProg
->data
->ProgramResourceList
= NULL
;
4257 shProg
->data
->NumProgramResourceList
= 0;
4260 int input_stage
= MESA_SHADER_STAGES
, output_stage
= 0;
4262 /* Determine first input and final output stage. These are used to
4263 * detect which variables should be enumerated in the resource list
4264 * for GL_PROGRAM_INPUT and GL_PROGRAM_OUTPUT.
4266 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
4267 if (!shProg
->_LinkedShaders
[i
])
4269 if (input_stage
== MESA_SHADER_STAGES
)
4274 /* Empty shader, no resources. */
4275 if (input_stage
== MESA_SHADER_STAGES
&& output_stage
== 0)
4278 struct set
*resource_set
= _mesa_set_create(NULL
,
4280 _mesa_key_pointer_equal
);
4282 /* Program interface needs to expose varyings in case of SSO. */
4283 if (shProg
->SeparateShader
) {
4284 if (!add_packed_varyings(ctx
, shProg
, resource_set
,
4285 input_stage
, GL_PROGRAM_INPUT
))
4288 if (!add_packed_varyings(ctx
, shProg
, resource_set
,
4289 output_stage
, GL_PROGRAM_OUTPUT
))
4293 if (!add_fragdata_arrays(ctx
, shProg
, resource_set
))
4296 /* Add inputs and outputs to the resource list. */
4297 if (!add_interface_variables(ctx
, shProg
, resource_set
,
4298 input_stage
, GL_PROGRAM_INPUT
))
4301 if (!add_interface_variables(ctx
, shProg
, resource_set
,
4302 output_stage
, GL_PROGRAM_OUTPUT
))
4305 if (shProg
->last_vert_prog
) {
4306 struct gl_transform_feedback_info
*linked_xfb
=
4307 shProg
->last_vert_prog
->sh
.LinkedTransformFeedback
;
4309 /* Add transform feedback varyings. */
4310 if (linked_xfb
->NumVarying
> 0) {
4311 for (int i
= 0; i
< linked_xfb
->NumVarying
; i
++) {
4312 if (!add_program_resource(shProg
, resource_set
,
4313 GL_TRANSFORM_FEEDBACK_VARYING
,
4314 &linked_xfb
->Varyings
[i
], 0))
4319 /* Add transform feedback buffers. */
4320 for (unsigned i
= 0; i
< ctx
->Const
.MaxTransformFeedbackBuffers
; i
++) {
4321 if ((linked_xfb
->ActiveBuffers
>> i
) & 1) {
4322 linked_xfb
->Buffers
[i
].Binding
= i
;
4323 if (!add_program_resource(shProg
, resource_set
,
4324 GL_TRANSFORM_FEEDBACK_BUFFER
,
4325 &linked_xfb
->Buffers
[i
], 0))
4331 /* Add uniforms from uniform storage. */
4332 for (unsigned i
= 0; i
< shProg
->data
->NumUniformStorage
; i
++) {
4333 /* Do not add uniforms internally used by Mesa. */
4334 if (shProg
->data
->UniformStorage
[i
].hidden
)
4338 build_stageref(shProg
, shProg
->data
->UniformStorage
[i
].name
,
4341 /* Add stagereferences for uniforms in a uniform block. */
4342 bool is_shader_storage
=
4343 shProg
->data
->UniformStorage
[i
].is_shader_storage
;
4344 int block_index
= shProg
->data
->UniformStorage
[i
].block_index
;
4345 if (block_index
!= -1) {
4346 stageref
|= is_shader_storage
?
4347 shProg
->data
->ShaderStorageBlocks
[block_index
].stageref
:
4348 shProg
->data
->UniformBlocks
[block_index
].stageref
;
4351 GLenum type
= is_shader_storage
? GL_BUFFER_VARIABLE
: GL_UNIFORM
;
4352 if (!should_add_buffer_variable(shProg
, type
,
4353 shProg
->data
->UniformStorage
[i
].name
))
4356 if (is_shader_storage
) {
4357 calculate_array_size_and_stride(ctx
, shProg
,
4358 &shProg
->data
->UniformStorage
[i
]);
4361 if (!add_program_resource(shProg
, resource_set
, type
,
4362 &shProg
->data
->UniformStorage
[i
], stageref
))
4366 /* Add program uniform blocks. */
4367 for (unsigned i
= 0; i
< shProg
->data
->NumUniformBlocks
; i
++) {
4368 if (!add_program_resource(shProg
, resource_set
, GL_UNIFORM_BLOCK
,
4369 &shProg
->data
->UniformBlocks
[i
], 0))
4373 /* Add program shader storage blocks. */
4374 for (unsigned i
= 0; i
< shProg
->data
->NumShaderStorageBlocks
; i
++) {
4375 if (!add_program_resource(shProg
, resource_set
, GL_SHADER_STORAGE_BLOCK
,
4376 &shProg
->data
->ShaderStorageBlocks
[i
], 0))
4380 /* Add atomic counter buffers. */
4381 for (unsigned i
= 0; i
< shProg
->data
->NumAtomicBuffers
; i
++) {
4382 if (!add_program_resource(shProg
, resource_set
, GL_ATOMIC_COUNTER_BUFFER
,
4383 &shProg
->data
->AtomicBuffers
[i
], 0))
4387 for (unsigned i
= 0; i
< shProg
->data
->NumUniformStorage
; i
++) {
4389 if (!shProg
->data
->UniformStorage
[i
].hidden
)
4392 for (int j
= MESA_SHADER_VERTEX
; j
< MESA_SHADER_STAGES
; j
++) {
4393 if (!shProg
->data
->UniformStorage
[i
].opaque
[j
].active
||
4394 !shProg
->data
->UniformStorage
[i
].type
->is_subroutine())
4397 type
= _mesa_shader_stage_to_subroutine_uniform((gl_shader_stage
)j
);
4398 /* add shader subroutines */
4399 if (!add_program_resource(shProg
, resource_set
,
4400 type
, &shProg
->data
->UniformStorage
[i
], 0))
4405 unsigned mask
= shProg
->data
->linked_stages
;
4407 const int i
= u_bit_scan(&mask
);
4408 struct gl_program
*p
= shProg
->_LinkedShaders
[i
]->Program
;
4410 GLuint type
= _mesa_shader_stage_to_subroutine((gl_shader_stage
)i
);
4411 for (unsigned j
= 0; j
< p
->sh
.NumSubroutineFunctions
; j
++) {
4412 if (!add_program_resource(shProg
, resource_set
,
4413 type
, &p
->sh
.SubroutineFunctions
[j
], 0))
4418 _mesa_set_destroy(resource_set
, NULL
);
4422 * This check is done to make sure we allow only constant expression
4423 * indexing and "constant-index-expression" (indexing with an expression
4424 * that includes loop induction variable).
4427 validate_sampler_array_indexing(struct gl_context
*ctx
,
4428 struct gl_shader_program
*prog
)
4430 dynamic_sampler_array_indexing_visitor v
;
4431 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
4432 if (prog
->_LinkedShaders
[i
] == NULL
)
4435 bool no_dynamic_indexing
=
4436 ctx
->Const
.ShaderCompilerOptions
[i
].EmitNoIndirectSampler
;
4438 /* Search for array derefs in shader. */
4439 v
.run(prog
->_LinkedShaders
[i
]->ir
);
4440 if (v
.uses_dynamic_sampler_array_indexing()) {
4441 const char *msg
= "sampler arrays indexed with non-constant "
4442 "expressions is forbidden in GLSL %s %u";
4443 /* Backend has indicated that it has no dynamic indexing support. */
4444 if (no_dynamic_indexing
) {
4445 linker_error(prog
, msg
, prog
->IsES
? "ES" : "",
4446 prog
->data
->Version
);
4449 linker_warning(prog
, msg
, prog
->IsES
? "ES" : "",
4450 prog
->data
->Version
);
4458 link_assign_subroutine_types(struct gl_shader_program
*prog
)
4460 unsigned mask
= prog
->data
->linked_stages
;
4462 const int i
= u_bit_scan(&mask
);
4463 gl_program
*p
= prog
->_LinkedShaders
[i
]->Program
;
4465 p
->sh
.MaxSubroutineFunctionIndex
= 0;
4466 foreach_in_list(ir_instruction
, node
, prog
->_LinkedShaders
[i
]->ir
) {
4467 ir_function
*fn
= node
->as_function();
4471 if (fn
->is_subroutine
)
4472 p
->sh
.NumSubroutineUniformTypes
++;
4474 if (!fn
->num_subroutine_types
)
4477 /* these should have been calculated earlier. */
4478 assert(fn
->subroutine_index
!= -1);
4479 if (p
->sh
.NumSubroutineFunctions
+ 1 > MAX_SUBROUTINES
) {
4480 linker_error(prog
, "Too many subroutine functions declared.\n");
4483 p
->sh
.SubroutineFunctions
= reralloc(p
, p
->sh
.SubroutineFunctions
,
4484 struct gl_subroutine_function
,
4485 p
->sh
.NumSubroutineFunctions
+ 1);
4486 p
->sh
.SubroutineFunctions
[p
->sh
.NumSubroutineFunctions
].name
= ralloc_strdup(p
, fn
->name
);
4487 p
->sh
.SubroutineFunctions
[p
->sh
.NumSubroutineFunctions
].num_compat_types
= fn
->num_subroutine_types
;
4488 p
->sh
.SubroutineFunctions
[p
->sh
.NumSubroutineFunctions
].types
=
4489 ralloc_array(p
, const struct glsl_type
*,
4490 fn
->num_subroutine_types
);
4492 /* From Section 4.4.4(Subroutine Function Layout Qualifiers) of the
4495 * "Each subroutine with an index qualifier in the shader must be
4496 * given a unique index, otherwise a compile or link error will be
4499 for (unsigned j
= 0; j
< p
->sh
.NumSubroutineFunctions
; j
++) {
4500 if (p
->sh
.SubroutineFunctions
[j
].index
!= -1 &&
4501 p
->sh
.SubroutineFunctions
[j
].index
== fn
->subroutine_index
) {
4502 linker_error(prog
, "each subroutine index qualifier in the "
4503 "shader must be unique\n");
4507 p
->sh
.SubroutineFunctions
[p
->sh
.NumSubroutineFunctions
].index
=
4508 fn
->subroutine_index
;
4510 if (fn
->subroutine_index
> (int)p
->sh
.MaxSubroutineFunctionIndex
)
4511 p
->sh
.MaxSubroutineFunctionIndex
= fn
->subroutine_index
;
4513 for (int j
= 0; j
< fn
->num_subroutine_types
; j
++)
4514 p
->sh
.SubroutineFunctions
[p
->sh
.NumSubroutineFunctions
].types
[j
] = fn
->subroutine_types
[j
];
4515 p
->sh
.NumSubroutineFunctions
++;
4521 set_always_active_io(exec_list
*ir
, ir_variable_mode io_mode
)
4523 assert(io_mode
== ir_var_shader_in
|| io_mode
== ir_var_shader_out
);
4525 foreach_in_list(ir_instruction
, node
, ir
) {
4526 ir_variable
*const var
= node
->as_variable();
4528 if (var
== NULL
|| var
->data
.mode
!= io_mode
)
4531 /* Don't set always active on builtins that haven't been redeclared */
4532 if (var
->data
.how_declared
== ir_var_declared_implicitly
)
4535 var
->data
.always_active_io
= true;
4540 * When separate shader programs are enabled, only input/outputs between
4541 * the stages of a multi-stage separate program can be safely removed
4542 * from the shader interface. Other inputs/outputs must remain active.
4545 disable_varying_optimizations_for_sso(struct gl_shader_program
*prog
)
4547 unsigned first
, last
;
4548 assert(prog
->SeparateShader
);
4550 first
= MESA_SHADER_STAGES
;
4553 /* Determine first and last stage. Excluding the compute stage */
4554 for (unsigned i
= 0; i
< MESA_SHADER_COMPUTE
; i
++) {
4555 if (!prog
->_LinkedShaders
[i
])
4557 if (first
== MESA_SHADER_STAGES
)
4562 if (first
== MESA_SHADER_STAGES
)
4565 for (unsigned stage
= 0; stage
< MESA_SHADER_STAGES
; stage
++) {
4566 gl_linked_shader
*sh
= prog
->_LinkedShaders
[stage
];
4570 /* Prevent the removal of inputs to the first and outputs from the last
4571 * stage, unless they are the initial pipeline inputs or final pipeline
4572 * outputs, respectively.
4574 * The removal of IO between shaders in the same program is always
4577 if (stage
== first
&& stage
!= MESA_SHADER_VERTEX
)
4578 set_always_active_io(sh
->ir
, ir_var_shader_in
);
4579 if (stage
== last
&& stage
!= MESA_SHADER_FRAGMENT
)
4580 set_always_active_io(sh
->ir
, ir_var_shader_out
);
4585 link_and_validate_uniforms(struct gl_context
*ctx
,
4586 struct gl_shader_program
*prog
)
4588 update_array_sizes(prog
);
4589 link_assign_uniform_locations(prog
, ctx
);
4591 if (!prog
->data
->cache_fallback
) {
4592 link_assign_atomic_counter_resources(ctx
, prog
);
4593 link_calculate_subroutine_compat(prog
);
4594 check_resources(ctx
, prog
);
4595 check_subroutine_resources(prog
);
4596 check_image_resources(ctx
, prog
);
4597 link_check_atomic_counter_resources(ctx
, prog
);
4602 link_varyings_and_uniforms(unsigned first
, unsigned last
,
4603 struct gl_context
*ctx
,
4604 struct gl_shader_program
*prog
, void *mem_ctx
)
4606 /* Mark all generic shader inputs and outputs as unpaired. */
4607 for (unsigned i
= MESA_SHADER_VERTEX
; i
<= MESA_SHADER_FRAGMENT
; i
++) {
4608 if (prog
->_LinkedShaders
[i
] != NULL
) {
4609 link_invalidate_variable_locations(prog
->_LinkedShaders
[i
]->ir
);
4613 unsigned prev
= first
;
4614 for (unsigned i
= prev
+ 1; i
<= MESA_SHADER_FRAGMENT
; i
++) {
4615 if (prog
->_LinkedShaders
[i
] == NULL
)
4618 match_explicit_outputs_to_inputs(prog
->_LinkedShaders
[prev
],
4619 prog
->_LinkedShaders
[i
]);
4623 if (!assign_attribute_or_color_locations(mem_ctx
, prog
, &ctx
->Const
,
4624 MESA_SHADER_VERTEX
)) {
4628 if (!assign_attribute_or_color_locations(mem_ctx
, prog
, &ctx
->Const
,
4629 MESA_SHADER_FRAGMENT
)) {
4633 prog
->last_vert_prog
= NULL
;
4634 for (int i
= MESA_SHADER_GEOMETRY
; i
>= MESA_SHADER_VERTEX
; i
--) {
4635 if (prog
->_LinkedShaders
[i
] == NULL
)
4638 prog
->last_vert_prog
= prog
->_LinkedShaders
[i
]->Program
;
4642 if (!link_varyings(prog
, first
, last
, ctx
, mem_ctx
))
4645 link_and_validate_uniforms(ctx
, prog
);
4647 if (!prog
->data
->LinkStatus
)
4650 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
4651 if (prog
->_LinkedShaders
[i
] == NULL
)
4654 const struct gl_shader_compiler_options
*options
=
4655 &ctx
->Const
.ShaderCompilerOptions
[i
];
4657 if (options
->LowerBufferInterfaceBlocks
)
4658 lower_ubo_reference(prog
->_LinkedShaders
[i
],
4659 options
->ClampBlockIndicesToArrayBounds
,
4660 ctx
->Const
.UseSTD430AsDefaultPacking
);
4662 if (i
== MESA_SHADER_COMPUTE
)
4663 lower_shared_reference(ctx
, prog
, prog
->_LinkedShaders
[i
]);
4665 lower_vector_derefs(prog
->_LinkedShaders
[i
]);
4666 do_vec_index_to_swizzle(prog
->_LinkedShaders
[i
]->ir
);
4673 linker_optimisation_loop(struct gl_context
*ctx
, exec_list
*ir
,
4676 if (ctx
->Const
.GLSLOptimizeConservatively
) {
4677 /* Run it just once. */
4678 do_common_optimization(ir
, true, false,
4679 &ctx
->Const
.ShaderCompilerOptions
[stage
],
4680 ctx
->Const
.NativeIntegers
);
4682 /* Repeat it until it stops making changes. */
4683 while (do_common_optimization(ir
, true, false,
4684 &ctx
->Const
.ShaderCompilerOptions
[stage
],
4685 ctx
->Const
.NativeIntegers
))
4691 link_shaders(struct gl_context
*ctx
, struct gl_shader_program
*prog
)
4693 prog
->data
->LinkStatus
= linking_success
; /* All error paths will set this to false */
4694 prog
->data
->Validated
= false;
4696 /* Section 7.3 (Program Objects) of the OpenGL 4.5 Core Profile spec says:
4698 * "Linking can fail for a variety of reasons as specified in the
4699 * OpenGL Shading Language Specification, as well as any of the
4700 * following reasons:
4702 * - No shader objects are attached to program."
4704 * The Compatibility Profile specification does not list the error. In
4705 * Compatibility Profile missing shader stages are replaced by
4706 * fixed-function. This applies to the case where all stages are
4709 if (prog
->NumShaders
== 0) {
4710 if (ctx
->API
!= API_OPENGL_COMPAT
)
4711 linker_error(prog
, "no shaders attached to the program\n");
4715 #ifdef ENABLE_SHADER_CACHE
4716 /* If transform feedback used on the program then compile all shaders. */
4717 bool skip_cache
= false;
4718 if (prog
->TransformFeedback
.NumVarying
> 0) {
4719 for (unsigned i
= 0; i
< prog
->NumShaders
; i
++) {
4720 _mesa_glsl_compile_shader(ctx
, prog
->Shaders
[i
], false, false, true);
4725 if (!skip_cache
&& shader_cache_read_program_metadata(ctx
, prog
))
4729 void *mem_ctx
= ralloc_context(NULL
); // temporary linker context
4731 prog
->ARB_fragment_coord_conventions_enable
= false;
4733 /* Separate the shaders into groups based on their type.
4735 struct gl_shader
**shader_list
[MESA_SHADER_STAGES
];
4736 unsigned num_shaders
[MESA_SHADER_STAGES
];
4738 for (int i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
4739 shader_list
[i
] = (struct gl_shader
**)
4740 calloc(prog
->NumShaders
, sizeof(struct gl_shader
*));
4744 unsigned min_version
= UINT_MAX
;
4745 unsigned max_version
= 0;
4746 for (unsigned i
= 0; i
< prog
->NumShaders
; i
++) {
4747 min_version
= MIN2(min_version
, prog
->Shaders
[i
]->Version
);
4748 max_version
= MAX2(max_version
, prog
->Shaders
[i
]->Version
);
4750 if (prog
->Shaders
[i
]->IsES
!= prog
->Shaders
[0]->IsES
) {
4751 linker_error(prog
, "all shaders must use same shading "
4752 "language version\n");
4756 if (prog
->Shaders
[i
]->ARB_fragment_coord_conventions_enable
) {
4757 prog
->ARB_fragment_coord_conventions_enable
= true;
4760 gl_shader_stage shader_type
= prog
->Shaders
[i
]->Stage
;
4761 shader_list
[shader_type
][num_shaders
[shader_type
]] = prog
->Shaders
[i
];
4762 num_shaders
[shader_type
]++;
4765 /* In desktop GLSL, different shader versions may be linked together. In
4766 * GLSL ES, all shader versions must be the same.
4768 if (prog
->Shaders
[0]->IsES
&& min_version
!= max_version
) {
4769 linker_error(prog
, "all shaders must use same shading "
4770 "language version\n");
4774 prog
->data
->Version
= max_version
;
4775 prog
->IsES
= prog
->Shaders
[0]->IsES
;
4777 /* Some shaders have to be linked with some other shaders present.
4779 if (!prog
->SeparateShader
) {
4780 if (num_shaders
[MESA_SHADER_GEOMETRY
] > 0 &&
4781 num_shaders
[MESA_SHADER_VERTEX
] == 0) {
4782 linker_error(prog
, "Geometry shader must be linked with "
4786 if (num_shaders
[MESA_SHADER_TESS_EVAL
] > 0 &&
4787 num_shaders
[MESA_SHADER_VERTEX
] == 0) {
4788 linker_error(prog
, "Tessellation evaluation shader must be linked "
4789 "with vertex shader\n");
4792 if (num_shaders
[MESA_SHADER_TESS_CTRL
] > 0 &&
4793 num_shaders
[MESA_SHADER_VERTEX
] == 0) {
4794 linker_error(prog
, "Tessellation control shader must be linked with "
4799 /* Section 7.3 of the OpenGL ES 3.2 specification says:
4801 * "Linking can fail for [...] any of the following reasons:
4803 * * program contains an object to form a tessellation control
4804 * shader [...] and [...] the program is not separable and
4805 * contains no object to form a tessellation evaluation shader"
4807 * The OpenGL spec is contradictory. It allows linking without a tess
4808 * eval shader, but that can only be used with transform feedback and
4809 * rasterization disabled. However, transform feedback isn't allowed
4810 * with GL_PATCHES, so it can't be used.
4812 * More investigation showed that the idea of transform feedback after
4813 * a tess control shader was dropped, because some hw vendors couldn't
4814 * support tessellation without a tess eval shader, but the linker
4815 * section wasn't updated to reflect that.
4817 * All specifications (ARB_tessellation_shader, GL 4.0-4.5) have this
4820 * Do what's reasonable and always require a tess eval shader if a tess
4821 * control shader is present.
4823 if (num_shaders
[MESA_SHADER_TESS_CTRL
] > 0 &&
4824 num_shaders
[MESA_SHADER_TESS_EVAL
] == 0) {
4825 linker_error(prog
, "Tessellation control shader must be linked with "
4826 "tessellation evaluation shader\n");
4831 if (num_shaders
[MESA_SHADER_TESS_EVAL
] > 0 &&
4832 num_shaders
[MESA_SHADER_TESS_CTRL
] == 0) {
4833 linker_error(prog
, "GLSL ES requires non-separable programs "
4834 "containing a tessellation evaluation shader to also "
4835 "be linked with a tessellation control shader\n");
4841 /* Compute shaders have additional restrictions. */
4842 if (num_shaders
[MESA_SHADER_COMPUTE
] > 0 &&
4843 num_shaders
[MESA_SHADER_COMPUTE
] != prog
->NumShaders
) {
4844 linker_error(prog
, "Compute shaders may not be linked with any other "
4845 "type of shader\n");
4848 /* Link all shaders for a particular stage and validate the result.
4850 for (int stage
= 0; stage
< MESA_SHADER_STAGES
; stage
++) {
4851 if (num_shaders
[stage
] > 0) {
4852 gl_linked_shader
*const sh
=
4853 link_intrastage_shaders(mem_ctx
, ctx
, prog
, shader_list
[stage
],
4854 num_shaders
[stage
], false);
4856 if (!prog
->data
->LinkStatus
) {
4858 _mesa_delete_linked_shader(ctx
, sh
);
4863 case MESA_SHADER_VERTEX
:
4864 validate_vertex_shader_executable(prog
, sh
, ctx
);
4866 case MESA_SHADER_TESS_CTRL
:
4867 /* nothing to be done */
4869 case MESA_SHADER_TESS_EVAL
:
4870 validate_tess_eval_shader_executable(prog
, sh
, ctx
);
4872 case MESA_SHADER_GEOMETRY
:
4873 validate_geometry_shader_executable(prog
, sh
, ctx
);
4875 case MESA_SHADER_FRAGMENT
:
4876 validate_fragment_shader_executable(prog
, sh
);
4879 if (!prog
->data
->LinkStatus
) {
4881 _mesa_delete_linked_shader(ctx
, sh
);
4885 prog
->_LinkedShaders
[stage
] = sh
;
4886 prog
->data
->linked_stages
|= 1 << stage
;
4890 /* Here begins the inter-stage linking phase. Some initial validation is
4891 * performed, then locations are assigned for uniforms, attributes, and
4894 cross_validate_uniforms(prog
);
4895 if (!prog
->data
->LinkStatus
)
4898 unsigned first
, last
, prev
;
4900 first
= MESA_SHADER_STAGES
;
4903 /* Determine first and last stage. */
4904 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
4905 if (!prog
->_LinkedShaders
[i
])
4907 if (first
== MESA_SHADER_STAGES
)
4912 if (!prog
->data
->cache_fallback
) {
4913 check_explicit_uniform_locations(ctx
, prog
);
4914 link_assign_subroutine_types(prog
);
4917 if (!prog
->data
->LinkStatus
)
4920 resize_tes_inputs(ctx
, prog
);
4922 /* Validate the inputs of each stage with the output of the preceding
4926 for (unsigned i
= prev
+ 1; i
<= MESA_SHADER_FRAGMENT
; i
++) {
4927 if (prog
->_LinkedShaders
[i
] == NULL
)
4930 validate_interstage_inout_blocks(prog
, prog
->_LinkedShaders
[prev
],
4931 prog
->_LinkedShaders
[i
]);
4932 if (!prog
->data
->LinkStatus
)
4935 cross_validate_outputs_to_inputs(ctx
, prog
,
4936 prog
->_LinkedShaders
[prev
],
4937 prog
->_LinkedShaders
[i
]);
4938 if (!prog
->data
->LinkStatus
)
4944 /* The cross validation of outputs/inputs above validates explicit locations
4945 * but for SSO programs we need to do this also for the inputs in the
4946 * first stage and outputs of the last stage included in the program, since
4947 * there is no cross validation for these.
4949 if (prog
->SeparateShader
)
4950 validate_sso_explicit_locations(ctx
, prog
,
4951 (gl_shader_stage
) first
,
4952 (gl_shader_stage
) last
);
4954 /* Cross-validate uniform blocks between shader stages */
4955 validate_interstage_uniform_blocks(prog
, prog
->_LinkedShaders
);
4956 if (!prog
->data
->LinkStatus
)
4959 for (unsigned int i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
4960 if (prog
->_LinkedShaders
[i
] != NULL
)
4961 lower_named_interface_blocks(mem_ctx
, prog
->_LinkedShaders
[i
]);
4964 /* Implement the GLSL 1.30+ rule for discard vs infinite loops Do
4965 * it before optimization because we want most of the checks to get
4966 * dropped thanks to constant propagation.
4968 * This rule also applies to GLSL ES 3.00.
4970 if (max_version
>= (prog
->IsES
? 300 : 130)) {
4971 struct gl_linked_shader
*sh
= prog
->_LinkedShaders
[MESA_SHADER_FRAGMENT
];
4973 lower_discard_flow(sh
->ir
);
4977 if (prog
->SeparateShader
)
4978 disable_varying_optimizations_for_sso(prog
);
4980 if (!prog
->data
->cache_fallback
) {
4982 if (!interstage_cross_validate_uniform_blocks(prog
, false))
4986 if (!interstage_cross_validate_uniform_blocks(prog
, true))
4990 /* Do common optimization before assigning storage for attributes,
4991 * uniforms, and varyings. Later optimization could possibly make
4992 * some of that unused.
4994 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
4995 if (prog
->_LinkedShaders
[i
] == NULL
)
4998 detect_recursion_linked(prog
, prog
->_LinkedShaders
[i
]->ir
);
4999 if (!prog
->data
->LinkStatus
)
5002 if (ctx
->Const
.ShaderCompilerOptions
[i
].LowerCombinedClipCullDistance
) {
5003 lower_clip_cull_distance(prog
, prog
->_LinkedShaders
[i
]);
5006 if (ctx
->Const
.LowerTessLevel
) {
5007 lower_tess_level(prog
->_LinkedShaders
[i
]);
5010 /* Call opts before lowering const arrays to uniforms so we can const
5011 * propagate any elements accessed directly.
5013 linker_optimisation_loop(ctx
, prog
->_LinkedShaders
[i
]->ir
, i
);
5015 /* Call opts after lowering const arrays to copy propagate things. */
5016 if (lower_const_arrays_to_uniforms(prog
->_LinkedShaders
[i
]->ir
, i
))
5017 linker_optimisation_loop(ctx
, prog
->_LinkedShaders
[i
]->ir
, i
);
5019 propagate_invariance(prog
->_LinkedShaders
[i
]->ir
);
5022 /* Validation for special cases where we allow sampler array indexing
5023 * with loop induction variable. This check emits a warning or error
5024 * depending if backend can handle dynamic indexing.
5026 if ((!prog
->IsES
&& prog
->data
->Version
< 130) ||
5027 (prog
->IsES
&& prog
->data
->Version
< 300)) {
5028 if (!validate_sampler_array_indexing(ctx
, prog
))
5032 /* Check and validate stream emissions in geometry shaders */
5033 validate_geometry_shader_emissions(ctx
, prog
);
5035 store_fragdepth_layout(prog
);
5037 if(!link_varyings_and_uniforms(first
, last
, ctx
, prog
, mem_ctx
))
5040 /* OpenGL ES < 3.1 requires that a vertex shader and a fragment shader both
5041 * be present in a linked program. GL_ARB_ES2_compatibility doesn't say
5042 * anything about shader linking when one of the shaders (vertex or
5043 * fragment shader) is absent. So, the extension shouldn't change the
5044 * behavior specified in GLSL specification.
5046 * From OpenGL ES 3.1 specification (7.3 Program Objects):
5047 * "Linking can fail for a variety of reasons as specified in the
5048 * OpenGL ES Shading Language Specification, as well as any of the
5049 * following reasons:
5053 * * program contains objects to form either a vertex shader or
5054 * fragment shader, and program is not separable, and does not
5055 * contain objects to form both a vertex shader and fragment
5058 * However, the only scenario in 3.1+ where we don't require them both is
5059 * when we have a compute shader. For example:
5061 * - No shaders is a link error.
5062 * - Geom or Tess without a Vertex shader is a link error which means we
5063 * always require a Vertex shader and hence a Fragment shader.
5064 * - Finally a Compute shader linked with any other stage is a link error.
5066 if (!prog
->SeparateShader
&& ctx
->API
== API_OPENGLES2
&&
5067 num_shaders
[MESA_SHADER_COMPUTE
] == 0) {
5068 if (prog
->_LinkedShaders
[MESA_SHADER_VERTEX
] == NULL
) {
5069 linker_error(prog
, "program lacks a vertex shader\n");
5070 } else if (prog
->_LinkedShaders
[MESA_SHADER_FRAGMENT
] == NULL
) {
5071 linker_error(prog
, "program lacks a fragment shader\n");
5076 for (unsigned i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
5077 free(shader_list
[i
]);
5078 if (prog
->_LinkedShaders
[i
] == NULL
)
5081 /* Do a final validation step to make sure that the IR wasn't
5082 * invalidated by any modifications performed after intrastage linking.
5084 validate_ir_tree(prog
->_LinkedShaders
[i
]->ir
);
5086 /* Retain any live IR, but trash the rest. */
5087 reparent_ir(prog
->_LinkedShaders
[i
]->ir
, prog
->_LinkedShaders
[i
]->ir
);
5089 /* The symbol table in the linked shaders may contain references to
5090 * variables that were removed (e.g., unused uniforms). Since it may
5091 * contain junk, there is no possible valid use. Delete it and set the
5094 delete prog
->_LinkedShaders
[i
]->symbols
;
5095 prog
->_LinkedShaders
[i
]->symbols
= NULL
;
5098 ralloc_free(mem_ctx
);