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 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "glsl_symbol_table.h"
53 #include "glsl_parser_extras.h"
55 #include "compiler/glsl_types.h"
56 #include "util/hash_table.h"
57 #include "main/mtypes.h"
58 #include "main/macros.h"
59 #include "main/shaderobj.h"
61 #include "ir_builder.h"
62 #include "builtin_functions.h"
64 using namespace ir_builder
;
67 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
68 exec_list
*instructions
);
70 verify_subroutine_associated_funcs(struct _mesa_glsl_parse_state
*state
);
73 remove_per_vertex_blocks(exec_list
*instructions
,
74 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
77 * Visitor class that finds the first instance of any write-only variable that
78 * is ever read, if any
80 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
83 read_from_write_only_variable_visitor() : found(NULL
)
87 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
89 if (this->in_assignee
)
90 return visit_continue
;
92 ir_variable
*var
= ir
->variable_referenced();
93 /* We can have memory_write_only set on both images and buffer variables,
94 * but in the former there is a distinction between reads from
95 * the variable itself (write_only) and from the memory they point to
96 * (memory_write_only), while in the case of buffer variables there is
97 * no such distinction, that is why this check here is limited to
98 * buffer variables alone.
100 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
101 return visit_continue
;
103 if (var
->data
.memory_write_only
) {
108 return visit_continue
;
111 ir_variable
*get_variable() {
115 virtual ir_visitor_status
visit_enter(ir_expression
*ir
)
117 /* .length() doesn't actually read anything */
118 if (ir
->operation
== ir_unop_ssbo_unsized_array_length
)
119 return visit_continue_with_parent
;
121 return visit_continue
;
129 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
131 _mesa_glsl_initialize_variables(instructions
, state
);
133 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
135 state
->current_function
= NULL
;
137 state
->toplevel_ir
= instructions
;
139 state
->gs_input_prim_type_specified
= false;
140 state
->tcs_output_vertices_specified
= false;
141 state
->cs_input_local_size_specified
= false;
143 /* Section 4.2 of the GLSL 1.20 specification states:
144 * "The built-in functions are scoped in a scope outside the global scope
145 * users declare global variables in. That is, a shader's global scope,
146 * available for user-defined functions and global variables, is nested
147 * inside the scope containing the built-in functions."
149 * Since built-in functions like ftransform() access built-in variables,
150 * it follows that those must be in the outer scope as well.
152 * We push scope here to create this nesting effect...but don't pop.
153 * This way, a shader's globals are still in the symbol table for use
156 state
->symbols
->push_scope();
158 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
159 ast
->hir(instructions
, state
);
161 verify_subroutine_associated_funcs(state
);
162 detect_recursion_unlinked(state
, instructions
);
163 detect_conflicting_assignments(state
, instructions
);
165 state
->toplevel_ir
= NULL
;
167 /* Move all of the variable declarations to the front of the IR list, and
168 * reverse the order. This has the (intended!) side effect that vertex
169 * shader inputs and fragment shader outputs will appear in the IR in the
170 * same order that they appeared in the shader code. This results in the
171 * locations being assigned in the declared order. Many (arguably buggy)
172 * applications depend on this behavior, and it matches what nearly all
175 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
176 ir_variable
*const var
= node
->as_variable();
182 instructions
->push_head(var
);
185 /* Figure out if gl_FragCoord is actually used in fragment shader */
186 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
188 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
190 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
192 * If multiple shaders using members of a built-in block belonging to
193 * the same interface are linked together in the same program, they
194 * must all redeclare the built-in block in the same way, as described
195 * in section 4.3.7 "Interface Blocks" for interface block matching, or
196 * a link error will result.
198 * The phrase "using members of a built-in block" implies that if two
199 * shaders are linked together and one of them *does not use* any members
200 * of the built-in block, then that shader does not need to have a matching
201 * redeclaration of the built-in block.
203 * This appears to be a clarification to the behaviour established for
204 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
207 * The definition of "interface" in section 4.3.7 that applies here is as
210 * The boundary between adjacent programmable pipeline stages: This
211 * spans all the outputs in all compilation units of the first stage
212 * and all the inputs in all compilation units of the second stage.
214 * Therefore this rule applies to both inter- and intra-stage linking.
216 * The easiest way to implement this is to check whether the shader uses
217 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
218 * remove all the relevant variable declaration from the IR, so that the
219 * linker won't see them and complain about mismatches.
221 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
222 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
224 /* Check that we don't have reads from write-only variables */
225 read_from_write_only_variable_visitor v
;
227 ir_variable
*error_var
= v
.get_variable();
229 /* It would be nice to have proper location information, but for that
230 * we would need to check this as we process each kind of AST node
233 memset(&loc
, 0, sizeof(loc
));
234 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
240 static ir_expression_operation
241 get_implicit_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
242 struct _mesa_glsl_parse_state
*state
)
244 switch (to
->base_type
) {
245 case GLSL_TYPE_FLOAT
:
246 switch (from
->base_type
) {
247 case GLSL_TYPE_INT
: return ir_unop_i2f
;
248 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
249 default: return (ir_expression_operation
)0;
253 if (!state
->has_implicit_uint_to_int_conversion())
254 return (ir_expression_operation
)0;
255 switch (from
->base_type
) {
256 case GLSL_TYPE_INT
: return ir_unop_i2u
;
257 default: return (ir_expression_operation
)0;
260 case GLSL_TYPE_DOUBLE
:
261 if (!state
->has_double())
262 return (ir_expression_operation
)0;
263 switch (from
->base_type
) {
264 case GLSL_TYPE_INT
: return ir_unop_i2d
;
265 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
266 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
267 case GLSL_TYPE_INT64
: return ir_unop_i642d
;
268 case GLSL_TYPE_UINT64
: return ir_unop_u642d
;
269 default: return (ir_expression_operation
)0;
272 case GLSL_TYPE_UINT64
:
273 if (!state
->has_int64())
274 return (ir_expression_operation
)0;
275 switch (from
->base_type
) {
276 case GLSL_TYPE_INT
: return ir_unop_i2u64
;
277 case GLSL_TYPE_UINT
: return ir_unop_u2u64
;
278 case GLSL_TYPE_INT64
: return ir_unop_i642u64
;
279 default: return (ir_expression_operation
)0;
282 case GLSL_TYPE_INT64
:
283 if (!state
->has_int64())
284 return (ir_expression_operation
)0;
285 switch (from
->base_type
) {
286 case GLSL_TYPE_INT
: return ir_unop_i2i64
;
287 default: return (ir_expression_operation
)0;
290 default: return (ir_expression_operation
)0;
296 * If a conversion is available, convert one operand to a different type
298 * The \c from \c ir_rvalue is converted "in place".
300 * \param to Type that the operand it to be converted to
301 * \param from Operand that is being converted
302 * \param state GLSL compiler state
305 * If a conversion is possible (or unnecessary), \c true is returned.
306 * Otherwise \c false is returned.
309 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
310 struct _mesa_glsl_parse_state
*state
)
313 if (to
->base_type
== from
->type
->base_type
)
316 /* Prior to GLSL 1.20, there are no implicit conversions */
317 if (!state
->has_implicit_conversions())
320 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
322 * "There are no implicit array or structure conversions. For
323 * example, an array of int cannot be implicitly converted to an
326 if (!to
->is_numeric() || !from
->type
->is_numeric())
329 /* We don't actually want the specific type `to`, we want a type
330 * with the same base type as `to`, but the same vector width as
333 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
334 from
->type
->matrix_columns
);
336 ir_expression_operation op
= get_implicit_conversion_operation(to
, from
->type
, state
);
338 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
346 static const struct glsl_type
*
347 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
349 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
351 const glsl_type
*type_a
= value_a
->type
;
352 const glsl_type
*type_b
= value_b
->type
;
354 /* From GLSL 1.50 spec, page 56:
356 * "The arithmetic binary operators add (+), subtract (-),
357 * multiply (*), and divide (/) operate on integer and
358 * floating-point scalars, vectors, and matrices."
360 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
361 _mesa_glsl_error(loc
, state
,
362 "operands to arithmetic operators must be numeric");
363 return glsl_type::error_type
;
367 /* "If one operand is floating-point based and the other is
368 * not, then the conversions from Section 4.1.10 "Implicit
369 * Conversions" are applied to the non-floating-point-based operand."
371 if (!apply_implicit_conversion(type_a
, value_b
, state
)
372 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
373 _mesa_glsl_error(loc
, state
,
374 "could not implicitly convert operands to "
375 "arithmetic operator");
376 return glsl_type::error_type
;
378 type_a
= value_a
->type
;
379 type_b
= value_b
->type
;
381 /* "If the operands are integer types, they must both be signed or
384 * From this rule and the preceeding conversion it can be inferred that
385 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
386 * The is_numeric check above already filtered out the case where either
387 * type is not one of these, so now the base types need only be tested for
390 if (type_a
->base_type
!= type_b
->base_type
) {
391 _mesa_glsl_error(loc
, state
,
392 "base type mismatch for arithmetic operator");
393 return glsl_type::error_type
;
396 /* "All arithmetic binary operators result in the same fundamental type
397 * (signed integer, unsigned integer, or floating-point) as the
398 * operands they operate on, after operand type conversion. After
399 * conversion, the following cases are valid
401 * * The two operands are scalars. In this case the operation is
402 * applied, resulting in a scalar."
404 if (type_a
->is_scalar() && type_b
->is_scalar())
407 /* "* One operand is a scalar, and the other is a vector or matrix.
408 * In this case, the scalar operation is applied independently to each
409 * component of the vector or matrix, resulting in the same size
412 if (type_a
->is_scalar()) {
413 if (!type_b
->is_scalar())
415 } else if (type_b
->is_scalar()) {
419 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
420 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
423 assert(!type_a
->is_scalar());
424 assert(!type_b
->is_scalar());
426 /* "* The two operands are vectors of the same size. In this case, the
427 * operation is done component-wise resulting in the same size
430 if (type_a
->is_vector() && type_b
->is_vector()) {
431 if (type_a
== type_b
) {
434 _mesa_glsl_error(loc
, state
,
435 "vector size mismatch for arithmetic operator");
436 return glsl_type::error_type
;
440 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
441 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
442 * <vector, vector> have been handled. At least one of the operands must
443 * be matrix. Further, since there are no integer matrix types, the base
444 * type of both operands must be float.
446 assert(type_a
->is_matrix() || type_b
->is_matrix());
447 assert(type_a
->is_float() || type_a
->is_double());
448 assert(type_b
->is_float() || type_b
->is_double());
450 /* "* The operator is add (+), subtract (-), or divide (/), and the
451 * operands are matrices with the same number of rows and the same
452 * number of columns. In this case, the operation is done component-
453 * wise resulting in the same size matrix."
454 * * The operator is multiply (*), where both operands are matrices or
455 * one operand is a vector and the other a matrix. A right vector
456 * operand is treated as a column vector and a left vector operand as a
457 * row vector. In all these cases, it is required that the number of
458 * columns of the left operand is equal to the number of rows of the
459 * right operand. Then, the multiply (*) operation does a linear
460 * algebraic multiply, yielding an object that has the same number of
461 * rows as the left operand and the same number of columns as the right
462 * operand. Section 5.10 "Vector and Matrix Operations" explains in
463 * more detail how vectors and matrices are operated on."
466 if (type_a
== type_b
)
469 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
471 if (type
== glsl_type::error_type
) {
472 _mesa_glsl_error(loc
, state
,
473 "size mismatch for matrix multiplication");
480 /* "All other cases are illegal."
482 _mesa_glsl_error(loc
, state
, "type mismatch");
483 return glsl_type::error_type
;
487 static const struct glsl_type
*
488 unary_arithmetic_result_type(const struct glsl_type
*type
,
489 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
491 /* From GLSL 1.50 spec, page 57:
493 * "The arithmetic unary operators negate (-), post- and pre-increment
494 * and decrement (-- and ++) operate on integer or floating-point
495 * values (including vectors and matrices). All unary operators work
496 * component-wise on their operands. These result with the same type
499 if (!type
->is_numeric()) {
500 _mesa_glsl_error(loc
, state
,
501 "operands to arithmetic operators must be numeric");
502 return glsl_type::error_type
;
509 * \brief Return the result type of a bit-logic operation.
511 * If the given types to the bit-logic operator are invalid, return
512 * glsl_type::error_type.
514 * \param value_a LHS of bit-logic op
515 * \param value_b RHS of bit-logic op
517 static const struct glsl_type
*
518 bit_logic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
520 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
522 const glsl_type
*type_a
= value_a
->type
;
523 const glsl_type
*type_b
= value_b
->type
;
525 if (!state
->check_bitwise_operations_allowed(loc
)) {
526 return glsl_type::error_type
;
529 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
531 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
532 * (|). The operands must be of type signed or unsigned integers or
535 if (!type_a
->is_integer_32_64()) {
536 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
537 ast_expression::operator_string(op
));
538 return glsl_type::error_type
;
540 if (!type_b
->is_integer_32_64()) {
541 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
542 ast_expression::operator_string(op
));
543 return glsl_type::error_type
;
546 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
547 * make sense for bitwise operations, as they don't operate on floats.
549 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
550 * here. It wasn't clear whether or not we should apply them to bitwise
551 * operations. However, Khronos has decided that they should in future
552 * language revisions. Applications also rely on this behavior. We opt
553 * to apply them in general, but issue a portability warning.
555 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
557 if (type_a
->base_type
!= type_b
->base_type
) {
558 if (!apply_implicit_conversion(type_a
, value_b
, state
)
559 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
560 _mesa_glsl_error(loc
, state
,
561 "could not implicitly convert operands to "
563 ast_expression::operator_string(op
));
564 return glsl_type::error_type
;
566 _mesa_glsl_warning(loc
, state
,
567 "some implementations may not support implicit "
568 "int -> uint conversions for `%s' operators; "
569 "consider casting explicitly for portability",
570 ast_expression::operator_string(op
));
572 type_a
= value_a
->type
;
573 type_b
= value_b
->type
;
576 /* "The fundamental types of the operands (signed or unsigned) must
579 if (type_a
->base_type
!= type_b
->base_type
) {
580 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
581 "base type", ast_expression::operator_string(op
));
582 return glsl_type::error_type
;
585 /* "The operands cannot be vectors of differing size." */
586 if (type_a
->is_vector() &&
587 type_b
->is_vector() &&
588 type_a
->vector_elements
!= type_b
->vector_elements
) {
589 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
590 "different sizes", ast_expression::operator_string(op
));
591 return glsl_type::error_type
;
594 /* "If one operand is a scalar and the other a vector, the scalar is
595 * applied component-wise to the vector, resulting in the same type as
596 * the vector. The fundamental types of the operands [...] will be the
597 * resulting fundamental type."
599 if (type_a
->is_scalar())
605 static const struct glsl_type
*
606 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
607 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
609 const glsl_type
*type_a
= value_a
->type
;
610 const glsl_type
*type_b
= value_b
->type
;
612 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
613 return glsl_type::error_type
;
616 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
618 * "The operator modulus (%) operates on signed or unsigned integers or
621 if (!type_a
->is_integer_32_64()) {
622 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
623 return glsl_type::error_type
;
625 if (!type_b
->is_integer_32_64()) {
626 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
627 return glsl_type::error_type
;
630 /* "If the fundamental types in the operands do not match, then the
631 * conversions from section 4.1.10 "Implicit Conversions" are applied
632 * to create matching types."
634 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
635 * int -> uint conversion rules. Prior to that, there were no implicit
636 * conversions. So it's harmless to apply them universally - no implicit
637 * conversions will exist. If the types don't match, we'll receive false,
638 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
640 * "The operand types must both be signed or unsigned."
642 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
643 !apply_implicit_conversion(type_b
, value_a
, state
)) {
644 _mesa_glsl_error(loc
, state
,
645 "could not implicitly convert operands to "
646 "modulus (%%) operator");
647 return glsl_type::error_type
;
649 type_a
= value_a
->type
;
650 type_b
= value_b
->type
;
652 /* "The operands cannot be vectors of differing size. If one operand is
653 * a scalar and the other vector, then the scalar is applied component-
654 * wise to the vector, resulting in the same type as the vector. If both
655 * are vectors of the same size, the result is computed component-wise."
657 if (type_a
->is_vector()) {
658 if (!type_b
->is_vector()
659 || (type_a
->vector_elements
== type_b
->vector_elements
))
664 /* "The operator modulus (%) is not defined for any other data types
665 * (non-integer types)."
667 _mesa_glsl_error(loc
, state
, "type mismatch");
668 return glsl_type::error_type
;
672 static const struct glsl_type
*
673 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
674 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
676 const glsl_type
*type_a
= value_a
->type
;
677 const glsl_type
*type_b
= value_b
->type
;
679 /* From GLSL 1.50 spec, page 56:
680 * "The relational operators greater than (>), less than (<), greater
681 * than or equal (>=), and less than or equal (<=) operate only on
682 * scalar integer and scalar floating-point expressions."
684 if (!type_a
->is_numeric()
685 || !type_b
->is_numeric()
686 || !type_a
->is_scalar()
687 || !type_b
->is_scalar()) {
688 _mesa_glsl_error(loc
, state
,
689 "operands to relational operators must be scalar and "
691 return glsl_type::error_type
;
694 /* "Either the operands' types must match, or the conversions from
695 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
696 * operand, after which the types must match."
698 if (!apply_implicit_conversion(type_a
, value_b
, state
)
699 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
700 _mesa_glsl_error(loc
, state
,
701 "could not implicitly convert operands to "
702 "relational operator");
703 return glsl_type::error_type
;
705 type_a
= value_a
->type
;
706 type_b
= value_b
->type
;
708 if (type_a
->base_type
!= type_b
->base_type
) {
709 _mesa_glsl_error(loc
, state
, "base type mismatch");
710 return glsl_type::error_type
;
713 /* "The result is scalar Boolean."
715 return glsl_type::bool_type
;
719 * \brief Return the result type of a bit-shift operation.
721 * If the given types to the bit-shift operator are invalid, return
722 * glsl_type::error_type.
724 * \param type_a Type of LHS of bit-shift op
725 * \param type_b Type of RHS of bit-shift op
727 static const struct glsl_type
*
728 shift_result_type(const struct glsl_type
*type_a
,
729 const struct glsl_type
*type_b
,
731 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
733 if (!state
->check_bitwise_operations_allowed(loc
)) {
734 return glsl_type::error_type
;
737 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
739 * "The shift operators (<<) and (>>). For both operators, the operands
740 * must be signed or unsigned integers or integer vectors. One operand
741 * can be signed while the other is unsigned."
743 if (!type_a
->is_integer_32_64()) {
744 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
745 "integer vector", ast_expression::operator_string(op
));
746 return glsl_type::error_type
;
749 if (!type_b
->is_integer()) {
750 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
751 "integer vector", ast_expression::operator_string(op
));
752 return glsl_type::error_type
;
755 /* "If the first operand is a scalar, the second operand has to be
758 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
759 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
760 "second must be scalar as well",
761 ast_expression::operator_string(op
));
762 return glsl_type::error_type
;
765 /* If both operands are vectors, check that they have same number of
768 if (type_a
->is_vector() &&
769 type_b
->is_vector() &&
770 type_a
->vector_elements
!= type_b
->vector_elements
) {
771 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
772 "have same number of elements",
773 ast_expression::operator_string(op
));
774 return glsl_type::error_type
;
777 /* "In all cases, the resulting type will be the same type as the left
784 * Returns the innermost array index expression in an rvalue tree.
785 * This is the largest indexing level -- if an array of blocks, then
786 * it is the block index rather than an indexing expression for an
787 * array-typed member of an array of blocks.
790 find_innermost_array_index(ir_rvalue
*rv
)
792 ir_dereference_array
*last
= NULL
;
794 if (rv
->as_dereference_array()) {
795 last
= rv
->as_dereference_array();
797 } else if (rv
->as_dereference_record())
798 rv
= rv
->as_dereference_record()->record
;
799 else if (rv
->as_swizzle())
800 rv
= rv
->as_swizzle()->val
;
806 return last
->array_index
;
812 * Validates that a value can be assigned to a location with a specified type
814 * Validates that \c rhs can be assigned to some location. If the types are
815 * not an exact match but an automatic conversion is possible, \c rhs will be
819 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
820 * Otherwise the actual RHS to be assigned will be returned. This may be
821 * \c rhs, or it may be \c rhs after some type conversion.
824 * In addition to being used for assignments, this function is used to
825 * type-check return values.
828 validate_assignment(struct _mesa_glsl_parse_state
*state
,
829 YYLTYPE loc
, ir_rvalue
*lhs
,
830 ir_rvalue
*rhs
, bool is_initializer
)
832 /* If there is already some error in the RHS, just return it. Anything
833 * else will lead to an avalanche of error message back to the user.
835 if (rhs
->type
->is_error())
838 /* In the Tessellation Control Shader:
839 * If a per-vertex output variable is used as an l-value, it is an error
840 * if the expression indicating the vertex number is not the identifier
843 if (state
->stage
== MESA_SHADER_TESS_CTRL
&& !lhs
->type
->is_error()) {
844 ir_variable
*var
= lhs
->variable_referenced();
845 if (var
&& var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
846 ir_rvalue
*index
= find_innermost_array_index(lhs
);
847 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
848 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
849 _mesa_glsl_error(&loc
, state
,
850 "Tessellation control shader outputs can only "
851 "be indexed by gl_InvocationID");
857 /* If the types are identical, the assignment can trivially proceed.
859 if (rhs
->type
== lhs
->type
)
862 /* If the array element types are the same and the LHS is unsized,
863 * the assignment is okay for initializers embedded in variable
866 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
867 * is handled by ir_dereference::is_lvalue.
869 const glsl_type
*lhs_t
= lhs
->type
;
870 const glsl_type
*rhs_t
= rhs
->type
;
871 bool unsized_array
= false;
872 while(lhs_t
->is_array()) {
874 break; /* the rest of the inner arrays match so break out early */
875 if (!rhs_t
->is_array()) {
876 unsized_array
= false;
877 break; /* number of dimensions mismatch */
879 if (lhs_t
->length
== rhs_t
->length
) {
880 lhs_t
= lhs_t
->fields
.array
;
881 rhs_t
= rhs_t
->fields
.array
;
883 } else if (lhs_t
->is_unsized_array()) {
884 unsized_array
= true;
886 unsized_array
= false;
887 break; /* sized array mismatch */
889 lhs_t
= lhs_t
->fields
.array
;
890 rhs_t
= rhs_t
->fields
.array
;
893 if (is_initializer
) {
894 if (rhs
->type
->get_scalar_type() == lhs
->type
->get_scalar_type())
897 _mesa_glsl_error(&loc
, state
,
898 "implicitly sized arrays cannot be assigned");
903 /* Check for implicit conversion in GLSL 1.20 */
904 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
905 if (rhs
->type
== lhs
->type
)
909 _mesa_glsl_error(&loc
, state
,
910 "%s of type %s cannot be assigned to "
911 "variable of type %s",
912 is_initializer
? "initializer" : "value",
913 rhs
->type
->name
, lhs
->type
->name
);
919 mark_whole_array_access(ir_rvalue
*access
)
921 ir_dereference_variable
*deref
= access
->as_dereference_variable();
923 if (deref
&& deref
->var
) {
924 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
929 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
930 const char *non_lvalue_description
,
931 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
932 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
937 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
939 ir_variable
*lhs_var
= lhs
->variable_referenced();
941 lhs_var
->data
.assigned
= true;
943 if (!error_emitted
) {
944 if (non_lvalue_description
!= NULL
) {
945 _mesa_glsl_error(&lhs_loc
, state
,
947 non_lvalue_description
);
948 error_emitted
= true;
949 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
950 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
951 lhs_var
->data
.memory_read_only
))) {
952 /* We can have memory_read_only set on both images and buffer variables,
953 * but in the former there is a distinction between assignments to
954 * the variable itself (read_only) and to the memory they point to
955 * (memory_read_only), while in the case of buffer variables there is
956 * no such distinction, that is why this check here is limited to
957 * buffer variables alone.
959 _mesa_glsl_error(&lhs_loc
, state
,
960 "assignment to read-only variable '%s'",
962 error_emitted
= true;
963 } else if (lhs
->type
->is_array() &&
964 !state
->check_version(120, 300, &lhs_loc
,
965 "whole array assignment forbidden")) {
966 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
968 * "Other binary or unary expressions, non-dereferenced
969 * arrays, function names, swizzles with repeated fields,
970 * and constants cannot be l-values."
972 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
974 error_emitted
= true;
975 } else if (!lhs
->is_lvalue(state
)) {
976 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
977 error_emitted
= true;
982 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
983 if (new_rhs
!= NULL
) {
986 /* If the LHS array was not declared with a size, it takes it size from
987 * the RHS. If the LHS is an l-value and a whole array, it must be a
988 * dereference of a variable. Any other case would require that the LHS
989 * is either not an l-value or not a whole array.
991 if (lhs
->type
->is_unsized_array()) {
992 ir_dereference
*const d
= lhs
->as_dereference();
996 ir_variable
*const var
= d
->variable_referenced();
1000 if (var
->data
.max_array_access
>= rhs
->type
->array_size()) {
1001 /* FINISHME: This should actually log the location of the RHS. */
1002 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
1004 var
->data
.max_array_access
);
1007 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
1008 rhs
->type
->array_size());
1009 d
->type
= var
->type
;
1011 if (lhs
->type
->is_array()) {
1012 mark_whole_array_access(rhs
);
1013 mark_whole_array_access(lhs
);
1016 error_emitted
= true;
1019 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
1020 * but not post_inc) need the converted assigned value as an rvalue
1021 * to handle things like:
1027 if (!error_emitted
) {
1028 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1030 instructions
->push_tail(var
);
1031 instructions
->push_tail(assign(var
, rhs
));
1033 ir_dereference_variable
*deref_var
=
1034 new(ctx
) ir_dereference_variable(var
);
1035 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1036 rvalue
= new(ctx
) ir_dereference_variable(var
);
1038 rvalue
= ir_rvalue::error_value(ctx
);
1040 *out_rvalue
= rvalue
;
1043 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1047 return error_emitted
;
1051 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1053 void *ctx
= ralloc_parent(lvalue
);
1056 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1058 instructions
->push_tail(var
);
1060 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1063 return new(ctx
) ir_dereference_variable(var
);
1068 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1070 (void) instructions
;
1077 ast_node::has_sequence_subexpression() const
1083 ast_node::set_is_lhs(bool /* new_value */)
1088 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1089 struct _mesa_glsl_parse_state
*state
)
1091 (void)hir(instructions
, state
);
1095 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1096 struct _mesa_glsl_parse_state
*state
)
1098 (void)hir(instructions
, state
);
1102 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1105 ir_rvalue
*cmp
= NULL
;
1107 if (operation
== ir_binop_all_equal
)
1108 join_op
= ir_binop_logic_and
;
1110 join_op
= ir_binop_logic_or
;
1112 switch (op0
->type
->base_type
) {
1113 case GLSL_TYPE_FLOAT
:
1114 case GLSL_TYPE_FLOAT16
:
1115 case GLSL_TYPE_UINT
:
1117 case GLSL_TYPE_BOOL
:
1118 case GLSL_TYPE_DOUBLE
:
1119 case GLSL_TYPE_UINT64
:
1120 case GLSL_TYPE_INT64
:
1121 case GLSL_TYPE_UINT16
:
1122 case GLSL_TYPE_INT16
:
1123 case GLSL_TYPE_UINT8
:
1124 case GLSL_TYPE_INT8
:
1125 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1127 case GLSL_TYPE_ARRAY
: {
1128 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1129 ir_rvalue
*e0
, *e1
, *result
;
1131 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1132 new(mem_ctx
) ir_constant(i
));
1133 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1134 new(mem_ctx
) ir_constant(i
));
1135 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1138 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1144 mark_whole_array_access(op0
);
1145 mark_whole_array_access(op1
);
1149 case GLSL_TYPE_STRUCT
: {
1150 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1151 ir_rvalue
*e0
, *e1
, *result
;
1152 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1154 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1156 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1158 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1161 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1169 case GLSL_TYPE_ERROR
:
1170 case GLSL_TYPE_VOID
:
1171 case GLSL_TYPE_SAMPLER
:
1172 case GLSL_TYPE_IMAGE
:
1173 case GLSL_TYPE_INTERFACE
:
1174 case GLSL_TYPE_ATOMIC_UINT
:
1175 case GLSL_TYPE_SUBROUTINE
:
1176 case GLSL_TYPE_FUNCTION
:
1177 /* I assume a comparison of a struct containing a sampler just
1178 * ignores the sampler present in the type.
1184 cmp
= new(mem_ctx
) ir_constant(true);
1189 /* For logical operations, we want to ensure that the operands are
1190 * scalar booleans. If it isn't, emit an error and return a constant
1191 * boolean to avoid triggering cascading error messages.
1194 get_scalar_boolean_operand(exec_list
*instructions
,
1195 struct _mesa_glsl_parse_state
*state
,
1196 ast_expression
*parent_expr
,
1198 const char *operand_name
,
1199 bool *error_emitted
)
1201 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1203 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1205 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1208 if (!*error_emitted
) {
1209 YYLTYPE loc
= expr
->get_location();
1210 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1212 parent_expr
->operator_string(parent_expr
->oper
));
1213 *error_emitted
= true;
1216 return new(ctx
) ir_constant(true);
1220 * If name refers to a builtin array whose maximum allowed size is less than
1221 * size, report an error and return true. Otherwise return false.
1224 check_builtin_array_max_size(const char *name
, unsigned size
,
1225 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1227 if ((strcmp("gl_TexCoord", name
) == 0)
1228 && (size
> state
->Const
.MaxTextureCoords
)) {
1229 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1231 * "The size [of gl_TexCoord] can be at most
1232 * gl_MaxTextureCoords."
1234 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1235 "be larger than gl_MaxTextureCoords (%u)",
1236 state
->Const
.MaxTextureCoords
);
1237 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1238 state
->clip_dist_size
= size
;
1239 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1240 /* From section 7.1 (Vertex Shader Special Variables) of the
1243 * "The gl_ClipDistance array is predeclared as unsized and
1244 * must be sized by the shader either redeclaring it with a
1245 * size or indexing it only with integral constant
1246 * expressions. ... The size can be at most
1247 * gl_MaxClipDistances."
1249 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1250 "be larger than gl_MaxClipDistances (%u)",
1251 state
->Const
.MaxClipPlanes
);
1253 } else if (strcmp("gl_CullDistance", name
) == 0) {
1254 state
->cull_dist_size
= size
;
1255 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1256 /* From the ARB_cull_distance spec:
1258 * "The gl_CullDistance array is predeclared as unsized and
1259 * must be sized by the shader either redeclaring it with
1260 * a size or indexing it only with integral constant
1261 * expressions. The size determines the number and set of
1262 * enabled cull distances and can be at most
1263 * gl_MaxCullDistances."
1265 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1266 "be larger than gl_MaxCullDistances (%u)",
1267 state
->Const
.MaxClipPlanes
);
1273 * Create the constant 1, of a which is appropriate for incrementing and
1274 * decrementing values of the given GLSL type. For example, if type is vec4,
1275 * this creates a constant value of 1.0 having type float.
1277 * If the given type is invalid for increment and decrement operators, return
1278 * a floating point 1--the error will be detected later.
1281 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1283 switch (type
->base_type
) {
1284 case GLSL_TYPE_UINT
:
1285 return new(ctx
) ir_constant((unsigned) 1);
1287 return new(ctx
) ir_constant(1);
1288 case GLSL_TYPE_UINT64
:
1289 return new(ctx
) ir_constant((uint64_t) 1);
1290 case GLSL_TYPE_INT64
:
1291 return new(ctx
) ir_constant((int64_t) 1);
1293 case GLSL_TYPE_FLOAT
:
1294 return new(ctx
) ir_constant(1.0f
);
1299 ast_expression::hir(exec_list
*instructions
,
1300 struct _mesa_glsl_parse_state
*state
)
1302 return do_hir(instructions
, state
, true);
1306 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1307 struct _mesa_glsl_parse_state
*state
)
1309 do_hir(instructions
, state
, false);
1313 ast_expression::set_is_lhs(bool new_value
)
1315 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1316 * if we lack an identifier we can just skip it.
1318 if (this->primary_expression
.identifier
== NULL
)
1321 this->is_lhs
= new_value
;
1323 /* We need to go through the subexpressions tree to cover cases like
1324 * ast_field_selection
1326 if (this->subexpressions
[0] != NULL
)
1327 this->subexpressions
[0]->set_is_lhs(new_value
);
1331 ast_expression::do_hir(exec_list
*instructions
,
1332 struct _mesa_glsl_parse_state
*state
,
1336 static const int operations
[AST_NUM_OPERATORS
] = {
1337 -1, /* ast_assign doesn't convert to ir_expression. */
1338 -1, /* ast_plus doesn't convert to ir_expression. */
1348 ir_binop_less
, /* This is correct. See the ast_greater case below. */
1349 ir_binop_gequal
, /* This is correct. See the ast_lequal case below. */
1352 ir_binop_any_nequal
,
1362 /* Note: The following block of expression types actually convert
1363 * to multiple IR instructions.
1365 ir_binop_mul
, /* ast_mul_assign */
1366 ir_binop_div
, /* ast_div_assign */
1367 ir_binop_mod
, /* ast_mod_assign */
1368 ir_binop_add
, /* ast_add_assign */
1369 ir_binop_sub
, /* ast_sub_assign */
1370 ir_binop_lshift
, /* ast_ls_assign */
1371 ir_binop_rshift
, /* ast_rs_assign */
1372 ir_binop_bit_and
, /* ast_and_assign */
1373 ir_binop_bit_xor
, /* ast_xor_assign */
1374 ir_binop_bit_or
, /* ast_or_assign */
1376 -1, /* ast_conditional doesn't convert to ir_expression. */
1377 ir_binop_add
, /* ast_pre_inc. */
1378 ir_binop_sub
, /* ast_pre_dec. */
1379 ir_binop_add
, /* ast_post_inc. */
1380 ir_binop_sub
, /* ast_post_dec. */
1381 -1, /* ast_field_selection doesn't conv to ir_expression. */
1382 -1, /* ast_array_index doesn't convert to ir_expression. */
1383 -1, /* ast_function_call doesn't conv to ir_expression. */
1384 -1, /* ast_identifier doesn't convert to ir_expression. */
1385 -1, /* ast_int_constant doesn't convert to ir_expression. */
1386 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1387 -1, /* ast_float_constant doesn't conv to ir_expression. */
1388 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1389 -1, /* ast_sequence doesn't convert to ir_expression. */
1390 -1, /* ast_aggregate shouldn't ever even get here. */
1392 ir_rvalue
*result
= NULL
;
1394 const struct glsl_type
*type
, *orig_type
;
1395 bool error_emitted
= false;
1398 loc
= this->get_location();
1400 switch (this->oper
) {
1402 unreachable("ast_aggregate: Should never get here.");
1405 this->subexpressions
[0]->set_is_lhs(true);
1406 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1407 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1410 do_assignment(instructions
, state
,
1411 this->subexpressions
[0]->non_lvalue_description
,
1412 op
[0], op
[1], &result
, needs_rvalue
, false,
1413 this->subexpressions
[0]->get_location());
1418 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1420 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1422 error_emitted
= type
->is_error();
1428 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1430 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1432 error_emitted
= type
->is_error();
1434 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1442 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1443 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1445 type
= arithmetic_result_type(op
[0], op
[1],
1446 (this->oper
== ast_mul
),
1448 error_emitted
= type
->is_error();
1450 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1455 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1456 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1458 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1460 assert(operations
[this->oper
] == ir_binop_mod
);
1462 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1464 error_emitted
= type
->is_error();
1469 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1470 error_emitted
= true;
1473 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1474 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1475 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1477 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1479 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1486 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1487 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1489 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1491 /* The relational operators must either generate an error or result
1492 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1494 assert(type
->is_error()
1495 || (type
->is_boolean() && type
->is_scalar()));
1497 /* Like NIR, GLSL IR does not have opcodes for > or <=. Instead, swap
1498 * the arguments and use < or >=.
1500 if (this->oper
== ast_greater
|| this->oper
== ast_lequal
) {
1501 ir_rvalue
*const tmp
= op
[0];
1506 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1508 error_emitted
= type
->is_error();
1513 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1514 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1516 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1518 * "The equality operators equal (==), and not equal (!=)
1519 * operate on all types. They result in a scalar Boolean. If
1520 * the operand types do not match, then there must be a
1521 * conversion from Section 4.1.10 "Implicit Conversions"
1522 * applied to one operand that can make them match, in which
1523 * case this conversion is done."
1526 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1527 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1528 "no operation `%1$s' exists that takes a left-hand "
1529 "operand of type 'void' or a right operand of type "
1530 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1531 error_emitted
= true;
1532 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1533 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1534 || (op
[0]->type
!= op
[1]->type
)) {
1535 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1536 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1537 error_emitted
= true;
1538 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1539 !state
->check_version(120, 300, &loc
,
1540 "array comparisons forbidden")) {
1541 error_emitted
= true;
1542 } else if ((op
[0]->type
->contains_subroutine() ||
1543 op
[1]->type
->contains_subroutine())) {
1544 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1545 error_emitted
= true;
1546 } else if ((op
[0]->type
->contains_opaque() ||
1547 op
[1]->type
->contains_opaque())) {
1548 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1549 error_emitted
= true;
1552 if (error_emitted
) {
1553 result
= new(ctx
) ir_constant(false);
1555 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1556 assert(result
->type
== glsl_type::bool_type
);
1563 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1564 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1565 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1566 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1568 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1572 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1574 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1575 error_emitted
= true;
1578 if (!op
[0]->type
->is_integer_32_64()) {
1579 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1580 error_emitted
= true;
1583 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1584 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1587 case ast_logic_and
: {
1588 exec_list rhs_instructions
;
1589 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1590 "LHS", &error_emitted
);
1591 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1592 "RHS", &error_emitted
);
1594 if (rhs_instructions
.is_empty()) {
1595 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1597 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1600 instructions
->push_tail(tmp
);
1602 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1603 instructions
->push_tail(stmt
);
1605 stmt
->then_instructions
.append_list(&rhs_instructions
);
1606 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1607 ir_assignment
*const then_assign
=
1608 new(ctx
) ir_assignment(then_deref
, op
[1]);
1609 stmt
->then_instructions
.push_tail(then_assign
);
1611 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1612 ir_assignment
*const else_assign
=
1613 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1614 stmt
->else_instructions
.push_tail(else_assign
);
1616 result
= new(ctx
) ir_dereference_variable(tmp
);
1621 case ast_logic_or
: {
1622 exec_list rhs_instructions
;
1623 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1624 "LHS", &error_emitted
);
1625 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1626 "RHS", &error_emitted
);
1628 if (rhs_instructions
.is_empty()) {
1629 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1631 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1634 instructions
->push_tail(tmp
);
1636 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1637 instructions
->push_tail(stmt
);
1639 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1640 ir_assignment
*const then_assign
=
1641 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1642 stmt
->then_instructions
.push_tail(then_assign
);
1644 stmt
->else_instructions
.append_list(&rhs_instructions
);
1645 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1646 ir_assignment
*const else_assign
=
1647 new(ctx
) ir_assignment(else_deref
, op
[1]);
1648 stmt
->else_instructions
.push_tail(else_assign
);
1650 result
= new(ctx
) ir_dereference_variable(tmp
);
1656 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1658 * "The logical binary operators and (&&), or ( | | ), and
1659 * exclusive or (^^). They operate only on two Boolean
1660 * expressions and result in a Boolean expression."
1662 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1664 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1667 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1672 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1673 "operand", &error_emitted
);
1675 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1679 case ast_mul_assign
:
1680 case ast_div_assign
:
1681 case ast_add_assign
:
1682 case ast_sub_assign
: {
1683 this->subexpressions
[0]->set_is_lhs(true);
1684 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1685 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1687 orig_type
= op
[0]->type
;
1689 /* Break out if operand types were not parsed successfully. */
1690 if ((op
[0]->type
== glsl_type::error_type
||
1691 op
[1]->type
== glsl_type::error_type
))
1694 type
= arithmetic_result_type(op
[0], op
[1],
1695 (this->oper
== ast_mul_assign
),
1698 if (type
!= orig_type
) {
1699 _mesa_glsl_error(& loc
, state
,
1700 "could not implicitly convert "
1701 "%s to %s", type
->name
, orig_type
->name
);
1702 type
= glsl_type::error_type
;
1705 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1709 do_assignment(instructions
, state
,
1710 this->subexpressions
[0]->non_lvalue_description
,
1711 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1712 &result
, needs_rvalue
, false,
1713 this->subexpressions
[0]->get_location());
1715 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1716 * explicitly test for this because none of the binary expression
1717 * operators allow array operands either.
1723 case ast_mod_assign
: {
1724 this->subexpressions
[0]->set_is_lhs(true);
1725 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1726 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1728 orig_type
= op
[0]->type
;
1729 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1731 if (type
!= orig_type
) {
1732 _mesa_glsl_error(& loc
, state
,
1733 "could not implicitly convert "
1734 "%s to %s", type
->name
, orig_type
->name
);
1735 type
= glsl_type::error_type
;
1738 assert(operations
[this->oper
] == ir_binop_mod
);
1740 ir_rvalue
*temp_rhs
;
1741 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1745 do_assignment(instructions
, state
,
1746 this->subexpressions
[0]->non_lvalue_description
,
1747 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1748 &result
, needs_rvalue
, false,
1749 this->subexpressions
[0]->get_location());
1754 case ast_rs_assign
: {
1755 this->subexpressions
[0]->set_is_lhs(true);
1756 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1757 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1758 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1760 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1761 type
, op
[0], op
[1]);
1763 do_assignment(instructions
, state
,
1764 this->subexpressions
[0]->non_lvalue_description
,
1765 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1766 &result
, needs_rvalue
, false,
1767 this->subexpressions
[0]->get_location());
1771 case ast_and_assign
:
1772 case ast_xor_assign
:
1773 case ast_or_assign
: {
1774 this->subexpressions
[0]->set_is_lhs(true);
1775 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1776 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1778 orig_type
= op
[0]->type
;
1779 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1781 if (type
!= orig_type
) {
1782 _mesa_glsl_error(& loc
, state
,
1783 "could not implicitly convert "
1784 "%s to %s", type
->name
, orig_type
->name
);
1785 type
= glsl_type::error_type
;
1788 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1789 type
, op
[0], op
[1]);
1791 do_assignment(instructions
, state
,
1792 this->subexpressions
[0]->non_lvalue_description
,
1793 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1794 &result
, needs_rvalue
, false,
1795 this->subexpressions
[0]->get_location());
1799 case ast_conditional
: {
1800 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1802 * "The ternary selection operator (?:). It operates on three
1803 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1804 * first expression, which must result in a scalar Boolean."
1806 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1807 "condition", &error_emitted
);
1809 /* The :? operator is implemented by generating an anonymous temporary
1810 * followed by an if-statement. The last instruction in each branch of
1811 * the if-statement assigns a value to the anonymous temporary. This
1812 * temporary is the r-value of the expression.
1814 exec_list then_instructions
;
1815 exec_list else_instructions
;
1817 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1818 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1820 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1822 * "The second and third expressions can be any type, as
1823 * long their types match, or there is a conversion in
1824 * Section 4.1.10 "Implicit Conversions" that can be applied
1825 * to one of the expressions to make their types match. This
1826 * resulting matching type is the type of the entire
1829 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1830 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1831 || (op
[1]->type
!= op
[2]->type
)) {
1832 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1834 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1835 "operator must have matching types");
1836 error_emitted
= true;
1837 type
= glsl_type::error_type
;
1842 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1844 * "The second and third expressions must be the same type, but can
1845 * be of any type other than an array."
1847 if (type
->is_array() &&
1848 !state
->check_version(120, 300, &loc
,
1849 "second and third operands of ?: operator "
1850 "cannot be arrays")) {
1851 error_emitted
= true;
1854 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1856 * "Except for array indexing, structure member selection, and
1857 * parentheses, opaque variables are not allowed to be operands in
1858 * expressions; such use results in a compile-time error."
1860 if (type
->contains_opaque()) {
1861 if (!(state
->has_bindless() && (type
->is_image() || type
->is_sampler()))) {
1862 _mesa_glsl_error(&loc
, state
, "variables of type %s cannot be "
1863 "operands of the ?: operator", type
->name
);
1864 error_emitted
= true;
1868 ir_constant
*cond_val
= op
[0]->constant_expression_value(ctx
);
1870 if (then_instructions
.is_empty()
1871 && else_instructions
.is_empty()
1872 && cond_val
!= NULL
) {
1873 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1875 /* The copy to conditional_tmp reads the whole array. */
1876 if (type
->is_array()) {
1877 mark_whole_array_access(op
[1]);
1878 mark_whole_array_access(op
[2]);
1881 ir_variable
*const tmp
=
1882 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1883 instructions
->push_tail(tmp
);
1885 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1886 instructions
->push_tail(stmt
);
1888 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1889 ir_dereference
*const then_deref
=
1890 new(ctx
) ir_dereference_variable(tmp
);
1891 ir_assignment
*const then_assign
=
1892 new(ctx
) ir_assignment(then_deref
, op
[1]);
1893 stmt
->then_instructions
.push_tail(then_assign
);
1895 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1896 ir_dereference
*const else_deref
=
1897 new(ctx
) ir_dereference_variable(tmp
);
1898 ir_assignment
*const else_assign
=
1899 new(ctx
) ir_assignment(else_deref
, op
[2]);
1900 stmt
->else_instructions
.push_tail(else_assign
);
1902 result
= new(ctx
) ir_dereference_variable(tmp
);
1909 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1910 ? "pre-increment operation" : "pre-decrement operation";
1912 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1913 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1915 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1917 ir_rvalue
*temp_rhs
;
1918 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1922 do_assignment(instructions
, state
,
1923 this->subexpressions
[0]->non_lvalue_description
,
1924 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1925 &result
, needs_rvalue
, false,
1926 this->subexpressions
[0]->get_location());
1931 case ast_post_dec
: {
1932 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1933 ? "post-increment operation" : "post-decrement operation";
1934 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1935 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1937 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1939 if (error_emitted
) {
1940 result
= ir_rvalue::error_value(ctx
);
1944 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1946 ir_rvalue
*temp_rhs
;
1947 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1950 /* Get a temporary of a copy of the lvalue before it's modified.
1951 * This may get thrown away later.
1953 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1955 ir_rvalue
*junk_rvalue
;
1957 do_assignment(instructions
, state
,
1958 this->subexpressions
[0]->non_lvalue_description
,
1959 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1960 &junk_rvalue
, false, false,
1961 this->subexpressions
[0]->get_location());
1966 case ast_field_selection
:
1967 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1970 case ast_array_index
: {
1971 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1973 /* Getting if an array is being used uninitialized is beyond what we get
1974 * from ir_value.data.assigned. Setting is_lhs as true would force to
1975 * not raise a uninitialized warning when using an array
1977 subexpressions
[0]->set_is_lhs(true);
1978 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1979 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1981 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1984 if (result
->type
->is_error())
1985 error_emitted
= true;
1990 case ast_unsized_array_dim
:
1991 unreachable("ast_unsized_array_dim: Should never get here.");
1993 case ast_function_call
:
1994 /* Should *NEVER* get here. ast_function_call should always be handled
1995 * by ast_function_expression::hir.
1997 unreachable("ast_function_call: handled elsewhere ");
1999 case ast_identifier
: {
2000 /* ast_identifier can appear several places in a full abstract syntax
2001 * tree. This particular use must be at location specified in the grammar
2002 * as 'variable_identifier'.
2005 state
->symbols
->get_variable(this->primary_expression
.identifier
);
2008 /* the identifier might be a subroutine name */
2010 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
2011 var
= state
->symbols
->get_variable(sub_name
);
2012 ralloc_free(sub_name
);
2016 var
->data
.used
= true;
2017 result
= new(ctx
) ir_dereference_variable(var
);
2019 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
2021 && result
->variable_referenced()->data
.assigned
!= true
2022 && !is_gl_identifier(var
->name
)) {
2023 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
2024 this->primary_expression
.identifier
);
2027 /* From the EXT_shader_framebuffer_fetch spec:
2029 * "Unless the GL_EXT_shader_framebuffer_fetch extension has been
2030 * enabled in addition, it's an error to use gl_LastFragData if it
2031 * hasn't been explicitly redeclared with layout(noncoherent)."
2033 if (var
->data
.fb_fetch_output
&& var
->data
.memory_coherent
&&
2034 !state
->EXT_shader_framebuffer_fetch_enable
) {
2035 _mesa_glsl_error(&loc
, state
,
2036 "invalid use of framebuffer fetch output not "
2037 "qualified with layout(noncoherent)");
2041 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
2042 this->primary_expression
.identifier
);
2044 result
= ir_rvalue::error_value(ctx
);
2045 error_emitted
= true;
2050 case ast_int_constant
:
2051 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
2054 case ast_uint_constant
:
2055 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
2058 case ast_float_constant
:
2059 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
2062 case ast_bool_constant
:
2063 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2066 case ast_double_constant
:
2067 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2070 case ast_uint64_constant
:
2071 result
= new(ctx
) ir_constant(this->primary_expression
.uint64_constant
);
2074 case ast_int64_constant
:
2075 result
= new(ctx
) ir_constant(this->primary_expression
.int64_constant
);
2078 case ast_sequence
: {
2079 /* It should not be possible to generate a sequence in the AST without
2080 * any expressions in it.
2082 assert(!this->expressions
.is_empty());
2084 /* The r-value of a sequence is the last expression in the sequence. If
2085 * the other expressions in the sequence do not have side-effects (and
2086 * therefore add instructions to the instruction list), they get dropped
2089 exec_node
*previous_tail
= NULL
;
2090 YYLTYPE previous_operand_loc
= loc
;
2092 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2093 /* If one of the operands of comma operator does not generate any
2094 * code, we want to emit a warning. At each pass through the loop
2095 * previous_tail will point to the last instruction in the stream
2096 * *before* processing the previous operand. Naturally,
2097 * instructions->get_tail_raw() will point to the last instruction in
2098 * the stream *after* processing the previous operand. If the two
2099 * pointers match, then the previous operand had no effect.
2101 * The warning behavior here differs slightly from GCC. GCC will
2102 * only emit a warning if none of the left-hand operands have an
2103 * effect. However, it will emit a warning for each. I believe that
2104 * there are some cases in C (especially with GCC extensions) where
2105 * it is useful to have an intermediate step in a sequence have no
2106 * effect, but I don't think these cases exist in GLSL. Either way,
2107 * it would be a giant hassle to replicate that behavior.
2109 if (previous_tail
== instructions
->get_tail_raw()) {
2110 _mesa_glsl_warning(&previous_operand_loc
, state
,
2111 "left-hand operand of comma expression has "
2115 /* The tail is directly accessed instead of using the get_tail()
2116 * method for performance reasons. get_tail() has extra code to
2117 * return NULL when the list is empty. We don't care about that
2118 * here, so using get_tail_raw() is fine.
2120 previous_tail
= instructions
->get_tail_raw();
2121 previous_operand_loc
= ast
->get_location();
2123 result
= ast
->hir(instructions
, state
);
2126 /* Any errors should have already been emitted in the loop above.
2128 error_emitted
= true;
2132 type
= NULL
; /* use result->type, not type. */
2133 assert(result
!= NULL
|| !needs_rvalue
);
2135 if (result
&& result
->type
->is_error() && !error_emitted
)
2136 _mesa_glsl_error(& loc
, state
, "type mismatch");
2142 ast_expression::has_sequence_subexpression() const
2144 switch (this->oper
) {
2153 return this->subexpressions
[0]->has_sequence_subexpression();
2175 case ast_array_index
:
2176 case ast_mul_assign
:
2177 case ast_div_assign
:
2178 case ast_add_assign
:
2179 case ast_sub_assign
:
2180 case ast_mod_assign
:
2183 case ast_and_assign
:
2184 case ast_xor_assign
:
2186 return this->subexpressions
[0]->has_sequence_subexpression() ||
2187 this->subexpressions
[1]->has_sequence_subexpression();
2189 case ast_conditional
:
2190 return this->subexpressions
[0]->has_sequence_subexpression() ||
2191 this->subexpressions
[1]->has_sequence_subexpression() ||
2192 this->subexpressions
[2]->has_sequence_subexpression();
2197 case ast_field_selection
:
2198 case ast_identifier
:
2199 case ast_int_constant
:
2200 case ast_uint_constant
:
2201 case ast_float_constant
:
2202 case ast_bool_constant
:
2203 case ast_double_constant
:
2204 case ast_int64_constant
:
2205 case ast_uint64_constant
:
2211 case ast_function_call
:
2212 unreachable("should be handled by ast_function_expression::hir");
2214 case ast_unsized_array_dim
:
2215 unreachable("ast_unsized_array_dim: Should never get here.");
2222 ast_expression_statement::hir(exec_list
*instructions
,
2223 struct _mesa_glsl_parse_state
*state
)
2225 /* It is possible to have expression statements that don't have an
2226 * expression. This is the solitary semicolon:
2228 * for (i = 0; i < 5; i++)
2231 * In this case the expression will be NULL. Test for NULL and don't do
2232 * anything in that case.
2234 if (expression
!= NULL
)
2235 expression
->hir_no_rvalue(instructions
, state
);
2237 /* Statements do not have r-values.
2244 ast_compound_statement::hir(exec_list
*instructions
,
2245 struct _mesa_glsl_parse_state
*state
)
2248 state
->symbols
->push_scope();
2250 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2251 ast
->hir(instructions
, state
);
2254 state
->symbols
->pop_scope();
2256 /* Compound statements do not have r-values.
2262 * Evaluate the given exec_node (which should be an ast_node representing
2263 * a single array dimension) and return its integer value.
2266 process_array_size(exec_node
*node
,
2267 struct _mesa_glsl_parse_state
*state
)
2269 void *mem_ctx
= state
;
2271 exec_list dummy_instructions
;
2273 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2276 * Dimensions other than the outermost dimension can by unsized if they
2277 * are immediately sized by a constructor or initializer.
2279 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2282 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2283 YYLTYPE loc
= array_size
->get_location();
2286 _mesa_glsl_error(& loc
, state
,
2287 "array size could not be resolved");
2291 if (!ir
->type
->is_integer()) {
2292 _mesa_glsl_error(& loc
, state
,
2293 "array size must be integer type");
2297 if (!ir
->type
->is_scalar()) {
2298 _mesa_glsl_error(& loc
, state
,
2299 "array size must be scalar type");
2303 ir_constant
*const size
= ir
->constant_expression_value(mem_ctx
);
2305 (state
->is_version(120, 300) &&
2306 array_size
->has_sequence_subexpression())) {
2307 _mesa_glsl_error(& loc
, state
, "array size must be a "
2308 "constant valued expression");
2312 if (size
->value
.i
[0] <= 0) {
2313 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2317 assert(size
->type
== ir
->type
);
2319 /* If the array size is const (and we've verified that
2320 * it is) then no instructions should have been emitted
2321 * when we converted it to HIR. If they were emitted,
2322 * then either the array size isn't const after all, or
2323 * we are emitting unnecessary instructions.
2325 assert(dummy_instructions
.is_empty());
2327 return size
->value
.u
[0];
2330 static const glsl_type
*
2331 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2332 ast_array_specifier
*array_specifier
,
2333 struct _mesa_glsl_parse_state
*state
)
2335 const glsl_type
*array_type
= base
;
2337 if (array_specifier
!= NULL
) {
2338 if (base
->is_array()) {
2340 /* From page 19 (page 25) of the GLSL 1.20 spec:
2342 * "Only one-dimensional arrays may be declared."
2344 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2345 return glsl_type::error_type
;
2349 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2350 !node
->is_head_sentinel(); node
= node
->prev
) {
2351 unsigned array_size
= process_array_size(node
, state
);
2352 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2360 precision_qualifier_allowed(const glsl_type
*type
)
2362 /* Precision qualifiers apply to floating point, integer and opaque
2365 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2366 * "Any floating point or any integer declaration can have the type
2367 * preceded by one of these precision qualifiers [...] Literal
2368 * constants do not have precision qualifiers. Neither do Boolean
2371 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2374 * "Precision qualifiers are added for code portability with OpenGL
2375 * ES, not for functionality. They have the same syntax as in OpenGL
2378 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2380 * "uniform lowp sampler2D sampler;
2383 * lowp vec4 col = texture2D (sampler, coord);
2384 * // texture2D returns lowp"
2386 * From this, we infer that GLSL 1.30 (and later) should allow precision
2387 * qualifiers on sampler types just like float and integer types.
2389 const glsl_type
*const t
= type
->without_array();
2391 return (t
->is_float() || t
->is_integer() || t
->contains_opaque()) &&
2396 ast_type_specifier::glsl_type(const char **name
,
2397 struct _mesa_glsl_parse_state
*state
) const
2399 const struct glsl_type
*type
;
2401 if (this->type
!= NULL
)
2404 type
= structure
->type
;
2406 type
= state
->symbols
->get_type(this->type_name
);
2407 *name
= this->type_name
;
2409 YYLTYPE loc
= this->get_location();
2410 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2416 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2418 * "The precision statement
2420 * precision precision-qualifier type;
2422 * can be used to establish a default precision qualifier. The type field can
2423 * be either int or float or any of the sampler types, (...) If type is float,
2424 * the directive applies to non-precision-qualified floating point type
2425 * (scalar, vector, and matrix) declarations. If type is int, the directive
2426 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2427 * and unsigned) declarations."
2429 * We use the symbol table to keep the values of the default precisions for
2430 * each 'type' in each scope and we use the 'type' string from the precision
2431 * statement as key in the symbol table. When we want to retrieve the default
2432 * precision associated with a given glsl_type we need to know the type string
2433 * associated with it. This is what this function returns.
2436 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2438 switch (type
->base_type
) {
2439 case GLSL_TYPE_FLOAT
:
2441 case GLSL_TYPE_UINT
:
2444 case GLSL_TYPE_ATOMIC_UINT
:
2445 return "atomic_uint";
2446 case GLSL_TYPE_IMAGE
:
2448 case GLSL_TYPE_SAMPLER
: {
2449 const unsigned type_idx
=
2450 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2451 const unsigned offset
= type
->is_sampler() ? 0 : 4;
2452 assert(type_idx
< 4);
2453 switch (type
->sampled_type
) {
2454 case GLSL_TYPE_FLOAT
:
2455 switch (type
->sampler_dimensionality
) {
2456 case GLSL_SAMPLER_DIM_1D
: {
2457 assert(type
->is_sampler());
2458 static const char *const names
[4] = {
2459 "sampler1D", "sampler1DArray",
2460 "sampler1DShadow", "sampler1DArrayShadow"
2462 return names
[type_idx
];
2464 case GLSL_SAMPLER_DIM_2D
: {
2465 static const char *const names
[8] = {
2466 "sampler2D", "sampler2DArray",
2467 "sampler2DShadow", "sampler2DArrayShadow",
2468 "image2D", "image2DArray", NULL
, NULL
2470 return names
[offset
+ type_idx
];
2472 case GLSL_SAMPLER_DIM_3D
: {
2473 static const char *const names
[8] = {
2474 "sampler3D", NULL
, NULL
, NULL
,
2475 "image3D", NULL
, NULL
, NULL
2477 return names
[offset
+ type_idx
];
2479 case GLSL_SAMPLER_DIM_CUBE
: {
2480 static const char *const names
[8] = {
2481 "samplerCube", "samplerCubeArray",
2482 "samplerCubeShadow", "samplerCubeArrayShadow",
2483 "imageCube", NULL
, NULL
, NULL
2485 return names
[offset
+ type_idx
];
2487 case GLSL_SAMPLER_DIM_MS
: {
2488 assert(type
->is_sampler());
2489 static const char *const names
[4] = {
2490 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2492 return names
[type_idx
];
2494 case GLSL_SAMPLER_DIM_RECT
: {
2495 assert(type
->is_sampler());
2496 static const char *const names
[4] = {
2497 "samplerRect", NULL
, "samplerRectShadow", NULL
2499 return names
[type_idx
];
2501 case GLSL_SAMPLER_DIM_BUF
: {
2502 static const char *const names
[8] = {
2503 "samplerBuffer", NULL
, NULL
, NULL
,
2504 "imageBuffer", NULL
, NULL
, NULL
2506 return names
[offset
+ type_idx
];
2508 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2509 assert(type
->is_sampler());
2510 static const char *const names
[4] = {
2511 "samplerExternalOES", NULL
, NULL
, NULL
2513 return names
[type_idx
];
2516 unreachable("Unsupported sampler/image dimensionality");
2517 } /* sampler/image float dimensionality */
2520 switch (type
->sampler_dimensionality
) {
2521 case GLSL_SAMPLER_DIM_1D
: {
2522 assert(type
->is_sampler());
2523 static const char *const names
[4] = {
2524 "isampler1D", "isampler1DArray", NULL
, NULL
2526 return names
[type_idx
];
2528 case GLSL_SAMPLER_DIM_2D
: {
2529 static const char *const names
[8] = {
2530 "isampler2D", "isampler2DArray", NULL
, NULL
,
2531 "iimage2D", "iimage2DArray", NULL
, NULL
2533 return names
[offset
+ type_idx
];
2535 case GLSL_SAMPLER_DIM_3D
: {
2536 static const char *const names
[8] = {
2537 "isampler3D", NULL
, NULL
, NULL
,
2538 "iimage3D", NULL
, NULL
, NULL
2540 return names
[offset
+ type_idx
];
2542 case GLSL_SAMPLER_DIM_CUBE
: {
2543 static const char *const names
[8] = {
2544 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2545 "iimageCube", NULL
, NULL
, NULL
2547 return names
[offset
+ type_idx
];
2549 case GLSL_SAMPLER_DIM_MS
: {
2550 assert(type
->is_sampler());
2551 static const char *const names
[4] = {
2552 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2554 return names
[type_idx
];
2556 case GLSL_SAMPLER_DIM_RECT
: {
2557 assert(type
->is_sampler());
2558 static const char *const names
[4] = {
2559 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2561 return names
[type_idx
];
2563 case GLSL_SAMPLER_DIM_BUF
: {
2564 static const char *const names
[8] = {
2565 "isamplerBuffer", NULL
, NULL
, NULL
,
2566 "iimageBuffer", NULL
, NULL
, NULL
2568 return names
[offset
+ type_idx
];
2571 unreachable("Unsupported isampler/iimage dimensionality");
2572 } /* sampler/image int dimensionality */
2574 case GLSL_TYPE_UINT
:
2575 switch (type
->sampler_dimensionality
) {
2576 case GLSL_SAMPLER_DIM_1D
: {
2577 assert(type
->is_sampler());
2578 static const char *const names
[4] = {
2579 "usampler1D", "usampler1DArray", NULL
, NULL
2581 return names
[type_idx
];
2583 case GLSL_SAMPLER_DIM_2D
: {
2584 static const char *const names
[8] = {
2585 "usampler2D", "usampler2DArray", NULL
, NULL
,
2586 "uimage2D", "uimage2DArray", NULL
, NULL
2588 return names
[offset
+ type_idx
];
2590 case GLSL_SAMPLER_DIM_3D
: {
2591 static const char *const names
[8] = {
2592 "usampler3D", NULL
, NULL
, NULL
,
2593 "uimage3D", NULL
, NULL
, NULL
2595 return names
[offset
+ type_idx
];
2597 case GLSL_SAMPLER_DIM_CUBE
: {
2598 static const char *const names
[8] = {
2599 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2600 "uimageCube", NULL
, NULL
, NULL
2602 return names
[offset
+ type_idx
];
2604 case GLSL_SAMPLER_DIM_MS
: {
2605 assert(type
->is_sampler());
2606 static const char *const names
[4] = {
2607 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2609 return names
[type_idx
];
2611 case GLSL_SAMPLER_DIM_RECT
: {
2612 assert(type
->is_sampler());
2613 static const char *const names
[4] = {
2614 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2616 return names
[type_idx
];
2618 case GLSL_SAMPLER_DIM_BUF
: {
2619 static const char *const names
[8] = {
2620 "usamplerBuffer", NULL
, NULL
, NULL
,
2621 "uimageBuffer", NULL
, NULL
, NULL
2623 return names
[offset
+ type_idx
];
2626 unreachable("Unsupported usampler/uimage dimensionality");
2627 } /* sampler/image uint dimensionality */
2630 unreachable("Unsupported sampler/image type");
2631 } /* sampler/image type */
2633 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2636 unreachable("Unsupported type");
2641 select_gles_precision(unsigned qual_precision
,
2642 const glsl_type
*type
,
2643 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2645 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2646 * In GLES we take the precision from the type qualifier if present,
2647 * otherwise, if the type of the variable allows precision qualifiers at
2648 * all, we look for the default precision qualifier for that type in the
2651 assert(state
->es_shader
);
2653 unsigned precision
= GLSL_PRECISION_NONE
;
2654 if (qual_precision
) {
2655 precision
= qual_precision
;
2656 } else if (precision_qualifier_allowed(type
)) {
2657 const char *type_name
=
2658 get_type_name_for_precision_qualifier(type
->without_array());
2659 assert(type_name
!= NULL
);
2662 state
->symbols
->get_default_precision_qualifier(type_name
);
2663 if (precision
== ast_precision_none
) {
2664 _mesa_glsl_error(loc
, state
,
2665 "No precision specified in this scope for type `%s'",
2671 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2673 * "The default precision of all atomic types is highp. It is an error to
2674 * declare an atomic type with a different precision or to specify the
2675 * default precision for an atomic type to be lowp or mediump."
2677 if (type
->is_atomic_uint() && precision
!= ast_precision_high
) {
2678 _mesa_glsl_error(loc
, state
,
2679 "atomic_uint can only have highp precision qualifier");
2686 ast_fully_specified_type::glsl_type(const char **name
,
2687 struct _mesa_glsl_parse_state
*state
) const
2689 return this->specifier
->glsl_type(name
, state
);
2693 * Determine whether a toplevel variable declaration declares a varying. This
2694 * function operates by examining the variable's mode and the shader target,
2695 * so it correctly identifies linkage variables regardless of whether they are
2696 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2698 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2699 * this function will produce undefined results.
2702 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2705 case MESA_SHADER_VERTEX
:
2706 return var
->data
.mode
== ir_var_shader_out
;
2707 case MESA_SHADER_FRAGMENT
:
2708 return var
->data
.mode
== ir_var_shader_in
;
2710 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2715 is_allowed_invariant(ir_variable
*var
, struct _mesa_glsl_parse_state
*state
)
2717 if (is_varying_var(var
, state
->stage
))
2720 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
2721 * "Only variables output from a vertex shader can be candidates
2724 if (!state
->is_version(130, 100))
2728 * Later specs remove this language - so allowed invariant
2729 * on fragment shader outputs as well.
2731 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
2732 var
->data
.mode
== ir_var_shader_out
)
2738 * Matrix layout qualifiers are only allowed on certain types
2741 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2743 const glsl_type
*type
,
2746 if (var
&& !var
->is_in_buffer_block()) {
2747 /* Layout qualifiers may only apply to interface blocks and fields in
2750 _mesa_glsl_error(loc
, state
,
2751 "uniform block layout qualifiers row_major and "
2752 "column_major may not be applied to variables "
2753 "outside of uniform blocks");
2754 } else if (!type
->without_array()->is_matrix()) {
2755 /* The OpenGL ES 3.0 conformance tests did not originally allow
2756 * matrix layout qualifiers on non-matrices. However, the OpenGL
2757 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2758 * amended to specifically allow these layouts on all types. Emit
2759 * a warning so that people know their code may not be portable.
2761 _mesa_glsl_warning(loc
, state
,
2762 "uniform block layout qualifiers row_major and "
2763 "column_major applied to non-matrix types may "
2764 "be rejected by older compilers");
2769 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2770 struct _mesa_glsl_parse_state
*state
,
2771 unsigned xfb_buffer
) {
2772 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2773 _mesa_glsl_error(loc
, state
,
2774 "invalid xfb_buffer specified %d is larger than "
2775 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2777 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2784 /* From the ARB_enhanced_layouts spec:
2786 * "Variables and block members qualified with *xfb_offset* can be
2787 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2788 * The offset must be a multiple of the size of the first component of
2789 * the first qualified variable or block member, or a compile-time error
2790 * results. Further, if applied to an aggregate containing a double,
2791 * the offset must also be a multiple of 8, and the space taken in the
2792 * buffer will be a multiple of 8.
2795 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2796 struct _mesa_glsl_parse_state
*state
,
2797 int xfb_offset
, const glsl_type
*type
,
2798 unsigned component_size
) {
2799 const glsl_type
*t_without_array
= type
->without_array();
2801 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2802 _mesa_glsl_error(loc
, state
,
2803 "xfb_offset can't be used with unsized arrays.");
2807 /* Make sure nested structs don't contain unsized arrays, and validate
2808 * any xfb_offsets on interface members.
2810 if (t_without_array
->is_record() || t_without_array
->is_interface())
2811 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2812 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2814 /* When the interface block doesn't have an xfb_offset qualifier then
2815 * we apply the component size rules at the member level.
2817 if (xfb_offset
== -1)
2818 component_size
= member_t
->contains_double() ? 8 : 4;
2820 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2821 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2825 /* Nested structs or interface block without offset may not have had an
2826 * offset applied yet so return.
2828 if (xfb_offset
== -1) {
2832 if (xfb_offset
% component_size
) {
2833 _mesa_glsl_error(loc
, state
,
2834 "invalid qualifier xfb_offset=%d must be a multiple "
2835 "of the first component size of the first qualified "
2836 "variable or block member. Or double if an aggregate "
2837 "that contains a double (%d).",
2838 xfb_offset
, component_size
);
2846 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2849 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2850 _mesa_glsl_error(loc
, state
,
2851 "invalid stream specified %d is larger than "
2852 "MAX_VERTEX_STREAMS - 1 (%d).",
2853 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2861 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2864 const glsl_type
*type
,
2865 const ast_type_qualifier
*qual
)
2867 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2868 _mesa_glsl_error(loc
, state
,
2869 "the \"binding\" qualifier only applies to uniforms and "
2870 "shader storage buffer objects");
2874 unsigned qual_binding
;
2875 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2880 const struct gl_context
*const ctx
= state
->ctx
;
2881 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2882 unsigned max_index
= qual_binding
+ elements
- 1;
2883 const glsl_type
*base_type
= type
->without_array();
2885 if (base_type
->is_interface()) {
2886 /* UBOs. From page 60 of the GLSL 4.20 specification:
2887 * "If the binding point for any uniform block instance is less than zero,
2888 * or greater than or equal to the implementation-dependent maximum
2889 * number of uniform buffer bindings, a compilation error will occur.
2890 * When the binding identifier is used with a uniform block instanced as
2891 * an array of size N, all elements of the array from binding through
2892 * binding + N – 1 must be within this range."
2894 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2896 if (qual
->flags
.q
.uniform
&&
2897 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2898 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2899 "the maximum number of UBO binding points (%d)",
2900 qual_binding
, elements
,
2901 ctx
->Const
.MaxUniformBufferBindings
);
2905 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2906 * "If the binding point for any uniform or shader storage block instance
2907 * is less than zero, or greater than or equal to the
2908 * implementation-dependent maximum number of uniform buffer bindings, a
2909 * compile-time error will occur. When the binding identifier is used
2910 * with a uniform or shader storage block instanced as an array of size
2911 * N, all elements of the array from binding through binding + N – 1 must
2912 * be within this range."
2914 if (qual
->flags
.q
.buffer
&&
2915 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2916 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2917 "the maximum number of SSBO binding points (%d)",
2918 qual_binding
, elements
,
2919 ctx
->Const
.MaxShaderStorageBufferBindings
);
2922 } else if (base_type
->is_sampler()) {
2923 /* Samplers. From page 63 of the GLSL 4.20 specification:
2924 * "If the binding is less than zero, or greater than or equal to the
2925 * implementation-dependent maximum supported number of units, a
2926 * compilation error will occur. When the binding identifier is used
2927 * with an array of size N, all elements of the array from binding
2928 * through binding + N - 1 must be within this range."
2930 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2932 if (max_index
>= limit
) {
2933 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2934 "exceeds the maximum number of texture image units "
2935 "(%u)", qual_binding
, elements
, limit
);
2939 } else if (base_type
->contains_atomic()) {
2940 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2941 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2942 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2943 "maximum number of atomic counter buffer bindings "
2944 "(%u)", qual_binding
,
2945 ctx
->Const
.MaxAtomicBufferBindings
);
2949 } else if ((state
->is_version(420, 310) ||
2950 state
->ARB_shading_language_420pack_enable
) &&
2951 base_type
->is_image()) {
2952 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2953 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2954 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2955 "maximum number of image units (%d)", max_index
,
2956 ctx
->Const
.MaxImageUnits
);
2961 _mesa_glsl_error(loc
, state
,
2962 "the \"binding\" qualifier only applies to uniform "
2963 "blocks, storage blocks, opaque variables, or arrays "
2968 var
->data
.explicit_binding
= true;
2969 var
->data
.binding
= qual_binding
;
2975 validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state
*state
,
2977 const glsl_interp_mode interpolation
,
2978 const struct glsl_type
*var_type
,
2979 ir_variable_mode mode
)
2981 if (state
->stage
!= MESA_SHADER_FRAGMENT
||
2982 interpolation
== INTERP_MODE_FLAT
||
2983 mode
!= ir_var_shader_in
)
2986 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2987 * so must integer vertex outputs.
2989 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2990 * "Fragment shader inputs that are signed or unsigned integers or
2991 * integer vectors must be qualified with the interpolation qualifier
2994 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2995 * "Fragment shader inputs that are, or contain, signed or unsigned
2996 * integers or integer vectors must be qualified with the
2997 * interpolation qualifier flat."
2999 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3000 * "Vertex shader outputs that are, or contain, signed or unsigned
3001 * integers or integer vectors must be qualified with the
3002 * interpolation qualifier flat."
3004 * Note that prior to GLSL 1.50, this requirement applied to vertex
3005 * outputs rather than fragment inputs. That creates problems in the
3006 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3007 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3008 * apply the restriction to both vertex outputs and fragment inputs.
3010 * Note also that the desktop GLSL specs are missing the text "or
3011 * contain"; this is presumably an oversight, since there is no
3012 * reasonable way to interpolate a fragment shader input that contains
3013 * an integer. See Khronos bug #15671.
3015 if (state
->is_version(130, 300)
3016 && var_type
->contains_integer()) {
3017 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3018 "an integer, then it must be qualified with 'flat'");
3021 /* Double fragment inputs must be qualified with 'flat'.
3023 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
3024 * "This extension does not support interpolation of double-precision
3025 * values; doubles used as fragment shader inputs must be qualified as
3028 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
3029 * "Fragment shader inputs that are signed or unsigned integers, integer
3030 * vectors, or any double-precision floating-point type must be
3031 * qualified with the interpolation qualifier flat."
3033 * Note that the GLSL specs are missing the text "or contain"; this is
3034 * presumably an oversight. See Khronos bug #15671.
3036 * The 'double' type does not exist in GLSL ES so far.
3038 if (state
->has_double()
3039 && var_type
->contains_double()) {
3040 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3041 "a double, then it must be qualified with 'flat'");
3044 /* Bindless sampler/image fragment inputs must be qualified with 'flat'.
3046 * From section 4.3.4 of the ARB_bindless_texture spec:
3048 * "(modify last paragraph, p. 35, allowing samplers and images as
3049 * fragment shader inputs) ... Fragment inputs can only be signed and
3050 * unsigned integers and integer vectors, floating point scalars,
3051 * floating-point vectors, matrices, sampler and image types, or arrays
3052 * or structures of these. Fragment shader inputs that are signed or
3053 * unsigned integers, integer vectors, or any double-precision floating-
3054 * point type, or any sampler or image type must be qualified with the
3055 * interpolation qualifier "flat"."
3057 if (state
->has_bindless()
3058 && (var_type
->contains_sampler() || var_type
->contains_image())) {
3059 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3060 "a bindless sampler (or image), then it must be "
3061 "qualified with 'flat'");
3066 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
3068 const glsl_interp_mode interpolation
,
3069 const struct ast_type_qualifier
*qual
,
3070 const struct glsl_type
*var_type
,
3071 ir_variable_mode mode
)
3073 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
3074 * not to vertex shader inputs nor fragment shader outputs.
3076 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3077 * "Outputs from a vertex shader (out) and inputs to a fragment
3078 * shader (in) can be further qualified with one or more of these
3079 * interpolation qualifiers"
3081 * "These interpolation qualifiers may only precede the qualifiers in,
3082 * centroid in, out, or centroid out in a declaration. They do not apply
3083 * to the deprecated storage qualifiers varying or centroid
3084 * varying. They also do not apply to inputs into a vertex shader or
3085 * outputs from a fragment shader."
3087 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
3088 * "Outputs from a shader (out) and inputs to a shader (in) can be
3089 * further qualified with one of these interpolation qualifiers."
3091 * "These interpolation qualifiers may only precede the qualifiers
3092 * in, centroid in, out, or centroid out in a declaration. They do
3093 * not apply to inputs into a vertex shader or outputs from a
3096 if (state
->is_version(130, 300)
3097 && interpolation
!= INTERP_MODE_NONE
) {
3098 const char *i
= interpolation_string(interpolation
);
3099 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
3100 _mesa_glsl_error(loc
, state
,
3101 "interpolation qualifier `%s' can only be applied to "
3102 "shader inputs or outputs.", i
);
3104 switch (state
->stage
) {
3105 case MESA_SHADER_VERTEX
:
3106 if (mode
== ir_var_shader_in
) {
3107 _mesa_glsl_error(loc
, state
,
3108 "interpolation qualifier '%s' cannot be applied to "
3109 "vertex shader inputs", i
);
3112 case MESA_SHADER_FRAGMENT
:
3113 if (mode
== ir_var_shader_out
) {
3114 _mesa_glsl_error(loc
, state
,
3115 "interpolation qualifier '%s' cannot be applied to "
3116 "fragment shader outputs", i
);
3124 /* Interpolation qualifiers cannot be applied to 'centroid' and
3125 * 'centroid varying'.
3127 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3128 * "interpolation qualifiers may only precede the qualifiers in,
3129 * centroid in, out, or centroid out in a declaration. They do not apply
3130 * to the deprecated storage qualifiers varying or centroid varying."
3132 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3134 if (state
->is_version(130, 0)
3135 && interpolation
!= INTERP_MODE_NONE
3136 && qual
->flags
.q
.varying
) {
3138 const char *i
= interpolation_string(interpolation
);
3140 if (qual
->flags
.q
.centroid
)
3141 s
= "centroid varying";
3145 _mesa_glsl_error(loc
, state
,
3146 "qualifier '%s' cannot be applied to the "
3147 "deprecated storage qualifier '%s'", i
, s
);
3150 validate_fragment_flat_interpolation_input(state
, loc
, interpolation
,
3154 static glsl_interp_mode
3155 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3156 const struct glsl_type
*var_type
,
3157 ir_variable_mode mode
,
3158 struct _mesa_glsl_parse_state
*state
,
3161 glsl_interp_mode interpolation
;
3162 if (qual
->flags
.q
.flat
)
3163 interpolation
= INTERP_MODE_FLAT
;
3164 else if (qual
->flags
.q
.noperspective
)
3165 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3166 else if (qual
->flags
.q
.smooth
)
3167 interpolation
= INTERP_MODE_SMOOTH
;
3169 interpolation
= INTERP_MODE_NONE
;
3171 validate_interpolation_qualifier(state
, loc
,
3173 qual
, var_type
, mode
);
3175 return interpolation
;
3180 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3182 struct _mesa_glsl_parse_state
*state
,
3187 unsigned qual_location
;
3188 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3193 /* Checks for GL_ARB_explicit_uniform_location. */
3194 if (qual
->flags
.q
.uniform
) {
3195 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3198 const struct gl_context
*const ctx
= state
->ctx
;
3199 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3201 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3202 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3203 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3204 ctx
->Const
.MaxUserAssignableUniformLocations
);
3208 var
->data
.explicit_location
= true;
3209 var
->data
.location
= qual_location
;
3213 /* Between GL_ARB_explicit_attrib_location an
3214 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3215 * stage can be assigned explicit locations. The checking here associates
3216 * the correct extension with the correct stage's input / output:
3220 * vertex explicit_loc sso
3221 * tess control sso sso
3224 * fragment sso explicit_loc
3226 switch (state
->stage
) {
3227 case MESA_SHADER_VERTEX
:
3228 if (var
->data
.mode
== ir_var_shader_in
) {
3229 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3235 if (var
->data
.mode
== ir_var_shader_out
) {
3236 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3245 case MESA_SHADER_TESS_CTRL
:
3246 case MESA_SHADER_TESS_EVAL
:
3247 case MESA_SHADER_GEOMETRY
:
3248 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3249 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3258 case MESA_SHADER_FRAGMENT
:
3259 if (var
->data
.mode
== ir_var_shader_in
) {
3260 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3266 if (var
->data
.mode
== ir_var_shader_out
) {
3267 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3276 case MESA_SHADER_COMPUTE
:
3277 _mesa_glsl_error(loc
, state
,
3278 "compute shader variables cannot be given "
3279 "explicit locations");
3287 _mesa_glsl_error(loc
, state
,
3288 "%s cannot be given an explicit location in %s shader",
3290 _mesa_shader_stage_to_string(state
->stage
));
3292 var
->data
.explicit_location
= true;
3294 switch (state
->stage
) {
3295 case MESA_SHADER_VERTEX
:
3296 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3297 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3298 : (qual_location
+ VARYING_SLOT_VAR0
);
3301 case MESA_SHADER_TESS_CTRL
:
3302 case MESA_SHADER_TESS_EVAL
:
3303 case MESA_SHADER_GEOMETRY
:
3304 if (var
->data
.patch
)
3305 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3307 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3310 case MESA_SHADER_FRAGMENT
:
3311 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3312 ? (qual_location
+ FRAG_RESULT_DATA0
)
3313 : (qual_location
+ VARYING_SLOT_VAR0
);
3316 assert(!"Unexpected shader type");
3320 /* Check if index was set for the uniform instead of the function */
3321 if (qual
->flags
.q
.explicit_index
&& qual
->is_subroutine_decl()) {
3322 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3323 "used with subroutine functions");
3327 unsigned qual_index
;
3328 if (qual
->flags
.q
.explicit_index
&&
3329 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3331 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3332 * Layout Qualifiers):
3334 * "It is also a compile-time error if a fragment shader
3335 * sets a layout index to less than 0 or greater than 1."
3337 * Older specifications don't mandate a behavior; we take
3338 * this as a clarification and always generate the error.
3340 if (qual_index
> 1) {
3341 _mesa_glsl_error(loc
, state
,
3342 "explicit index may only be 0 or 1");
3344 var
->data
.explicit_index
= true;
3345 var
->data
.index
= qual_index
;
3352 validate_storage_for_sampler_image_types(ir_variable
*var
,
3353 struct _mesa_glsl_parse_state
*state
,
3356 /* From section 4.1.7 of the GLSL 4.40 spec:
3358 * "[Opaque types] can only be declared as function
3359 * parameters or uniform-qualified variables."
3361 * From section 4.1.7 of the ARB_bindless_texture spec:
3363 * "Samplers may be declared as shader inputs and outputs, as uniform
3364 * variables, as temporary variables, and as function parameters."
3366 * From section 4.1.X of the ARB_bindless_texture spec:
3368 * "Images may be declared as shader inputs and outputs, as uniform
3369 * variables, as temporary variables, and as function parameters."
3371 if (state
->has_bindless()) {
3372 if (var
->data
.mode
!= ir_var_auto
&&
3373 var
->data
.mode
!= ir_var_uniform
&&
3374 var
->data
.mode
!= ir_var_shader_in
&&
3375 var
->data
.mode
!= ir_var_shader_out
&&
3376 var
->data
.mode
!= ir_var_function_in
&&
3377 var
->data
.mode
!= ir_var_function_out
&&
3378 var
->data
.mode
!= ir_var_function_inout
) {
3379 _mesa_glsl_error(loc
, state
, "bindless image/sampler variables may "
3380 "only be declared as shader inputs and outputs, as "
3381 "uniform variables, as temporary variables and as "
3382 "function parameters");
3386 if (var
->data
.mode
!= ir_var_uniform
&&
3387 var
->data
.mode
!= ir_var_function_in
) {
3388 _mesa_glsl_error(loc
, state
, "image/sampler variables may only be "
3389 "declared as function parameters or "
3390 "uniform-qualified global variables");
3398 validate_memory_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3400 const struct ast_type_qualifier
*qual
,
3401 const glsl_type
*type
)
3403 /* From Section 4.10 (Memory Qualifiers) of the GLSL 4.50 spec:
3405 * "Memory qualifiers are only supported in the declarations of image
3406 * variables, buffer variables, and shader storage blocks; it is an error
3407 * to use such qualifiers in any other declarations.
3409 if (!type
->is_image() && !qual
->flags
.q
.buffer
) {
3410 if (qual
->flags
.q
.read_only
||
3411 qual
->flags
.q
.write_only
||
3412 qual
->flags
.q
.coherent
||
3413 qual
->flags
.q
._volatile
||
3414 qual
->flags
.q
.restrict_flag
) {
3415 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied "
3416 "in the declarations of image variables, buffer "
3417 "variables, and shader storage blocks");
3425 validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3427 const struct ast_type_qualifier
*qual
,
3428 const glsl_type
*type
)
3430 /* From section 4.4.6.2 (Format Layout Qualifiers) of the GLSL 4.50 spec:
3432 * "Format layout qualifiers can be used on image variable declarations
3433 * (those declared with a basic type having “image ” in its keyword)."
3435 if (!type
->is_image() && qual
->flags
.q
.explicit_image_format
) {
3436 _mesa_glsl_error(loc
, state
, "format layout qualifiers may only be "
3437 "applied to images");
3444 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3446 struct _mesa_glsl_parse_state
*state
,
3449 const glsl_type
*base_type
= var
->type
->without_array();
3451 if (!validate_image_format_qualifier_for_type(state
, loc
, qual
, base_type
) ||
3452 !validate_memory_qualifier_for_type(state
, loc
, qual
, base_type
))
3455 if (!base_type
->is_image())
3458 if (!validate_storage_for_sampler_image_types(var
, state
, loc
))
3461 var
->data
.memory_read_only
|= qual
->flags
.q
.read_only
;
3462 var
->data
.memory_write_only
|= qual
->flags
.q
.write_only
;
3463 var
->data
.memory_coherent
|= qual
->flags
.q
.coherent
;
3464 var
->data
.memory_volatile
|= qual
->flags
.q
._volatile
;
3465 var
->data
.memory_restrict
|= qual
->flags
.q
.restrict_flag
;
3467 if (qual
->flags
.q
.explicit_image_format
) {
3468 if (var
->data
.mode
== ir_var_function_in
) {
3469 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be used on "
3470 "image function parameters");
3473 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3474 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the base "
3475 "data type of the image");
3478 var
->data
.image_format
= qual
->image_format
;
3480 if (var
->data
.mode
== ir_var_uniform
) {
3481 if (state
->es_shader
) {
3482 _mesa_glsl_error(loc
, state
, "all image uniforms must have a "
3483 "format layout qualifier");
3484 } else if (!qual
->flags
.q
.write_only
) {
3485 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3486 "`writeonly' must have a format layout qualifier");
3489 var
->data
.image_format
= GL_NONE
;
3492 /* From page 70 of the GLSL ES 3.1 specification:
3494 * "Except for image variables qualified with the format qualifiers r32f,
3495 * r32i, and r32ui, image variables must specify either memory qualifier
3496 * readonly or the memory qualifier writeonly."
3498 if (state
->es_shader
&&
3499 var
->data
.image_format
!= GL_R32F
&&
3500 var
->data
.image_format
!= GL_R32I
&&
3501 var
->data
.image_format
!= GL_R32UI
&&
3502 !var
->data
.memory_read_only
&&
3503 !var
->data
.memory_write_only
) {
3504 _mesa_glsl_error(loc
, state
, "image variables of format other than r32f, "
3505 "r32i or r32ui must be qualified `readonly' or "
3510 static inline const char*
3511 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3513 if (origin_upper_left
&& pixel_center_integer
)
3514 return "origin_upper_left, pixel_center_integer";
3515 else if (origin_upper_left
)
3516 return "origin_upper_left";
3517 else if (pixel_center_integer
)
3518 return "pixel_center_integer";
3524 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3525 const struct ast_type_qualifier
*qual
)
3527 /* If gl_FragCoord was previously declared, and the qualifiers were
3528 * different in any way, return true.
3530 if (state
->fs_redeclares_gl_fragcoord
) {
3531 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3532 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3539 validate_array_dimensions(const glsl_type
*t
,
3540 struct _mesa_glsl_parse_state
*state
,
3542 if (t
->is_array()) {
3543 t
= t
->fields
.array
;
3544 while (t
->is_array()) {
3545 if (t
->is_unsized_array()) {
3546 _mesa_glsl_error(loc
, state
,
3547 "only the outermost array dimension can "
3552 t
= t
->fields
.array
;
3558 apply_bindless_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3560 struct _mesa_glsl_parse_state
*state
,
3563 bool has_local_qualifiers
= qual
->flags
.q
.bindless_sampler
||
3564 qual
->flags
.q
.bindless_image
||
3565 qual
->flags
.q
.bound_sampler
||
3566 qual
->flags
.q
.bound_image
;
3568 /* The ARB_bindless_texture spec says:
3570 * "Modify Section 4.4.6 Opaque-Uniform Layout Qualifiers of the GLSL 4.30
3573 * "If these layout qualifiers are applied to other types of default block
3574 * uniforms, or variables with non-uniform storage, a compile-time error
3575 * will be generated."
3577 if (has_local_qualifiers
&& !qual
->flags
.q
.uniform
) {
3578 _mesa_glsl_error(loc
, state
, "ARB_bindless_texture layout qualifiers "
3579 "can only be applied to default block uniforms or "
3580 "variables with uniform storage");
3584 /* The ARB_bindless_texture spec doesn't state anything in this situation,
3585 * but it makes sense to only allow bindless_sampler/bound_sampler for
3586 * sampler types, and respectively bindless_image/bound_image for image
3589 if ((qual
->flags
.q
.bindless_sampler
|| qual
->flags
.q
.bound_sampler
) &&
3590 !var
->type
->contains_sampler()) {
3591 _mesa_glsl_error(loc
, state
, "bindless_sampler or bound_sampler can only "
3592 "be applied to sampler types");
3596 if ((qual
->flags
.q
.bindless_image
|| qual
->flags
.q
.bound_image
) &&
3597 !var
->type
->contains_image()) {
3598 _mesa_glsl_error(loc
, state
, "bindless_image or bound_image can only be "
3599 "applied to image types");
3603 /* The bindless_sampler/bindless_image (and respectively
3604 * bound_sampler/bound_image) layout qualifiers can be set at global and at
3607 if (var
->type
->contains_sampler() || var
->type
->contains_image()) {
3608 var
->data
.bindless
= qual
->flags
.q
.bindless_sampler
||
3609 qual
->flags
.q
.bindless_image
||
3610 state
->bindless_sampler_specified
||
3611 state
->bindless_image_specified
;
3613 var
->data
.bound
= qual
->flags
.q
.bound_sampler
||
3614 qual
->flags
.q
.bound_image
||
3615 state
->bound_sampler_specified
||
3616 state
->bound_image_specified
;
3621 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3623 struct _mesa_glsl_parse_state
*state
,
3626 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3628 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3630 * "Within any shader, the first redeclarations of gl_FragCoord
3631 * must appear before any use of gl_FragCoord."
3633 * Generate a compiler error if above condition is not met by the
3636 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3637 if (earlier
!= NULL
&&
3638 earlier
->data
.used
&&
3639 !state
->fs_redeclares_gl_fragcoord
) {
3640 _mesa_glsl_error(loc
, state
,
3641 "gl_FragCoord used before its first redeclaration "
3642 "in fragment shader");
3645 /* Make sure all gl_FragCoord redeclarations specify the same layout
3648 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3649 const char *const qual_string
=
3650 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3651 qual
->flags
.q
.pixel_center_integer
);
3653 const char *const state_string
=
3654 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3655 state
->fs_pixel_center_integer
);
3657 _mesa_glsl_error(loc
, state
,
3658 "gl_FragCoord redeclared with different layout "
3659 "qualifiers (%s) and (%s) ",
3663 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3664 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3665 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3666 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3667 state
->fs_redeclares_gl_fragcoord
=
3668 state
->fs_origin_upper_left
||
3669 state
->fs_pixel_center_integer
||
3670 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3673 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3674 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3675 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3676 ? "origin_upper_left" : "pixel_center_integer";
3678 _mesa_glsl_error(loc
, state
,
3679 "layout qualifier `%s' can only be applied to "
3680 "fragment shader input `gl_FragCoord'",
3684 if (qual
->flags
.q
.explicit_location
) {
3685 apply_explicit_location(qual
, var
, state
, loc
);
3687 if (qual
->flags
.q
.explicit_component
) {
3688 unsigned qual_component
;
3689 if (process_qualifier_constant(state
, loc
, "component",
3690 qual
->component
, &qual_component
)) {
3691 const glsl_type
*type
= var
->type
->without_array();
3692 unsigned components
= type
->component_slots();
3694 if (type
->is_matrix() || type
->is_record()) {
3695 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3696 "cannot be applied to a matrix, a structure, "
3697 "a block, or an array containing any of "
3699 } else if (qual_component
!= 0 &&
3700 (qual_component
+ components
- 1) > 3) {
3701 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3702 (qual_component
+ components
- 1));
3703 } else if (qual_component
== 1 && type
->is_64bit()) {
3704 /* We don't bother checking for 3 as it should be caught by the
3705 * overflow check above.
3707 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3708 "component 1 or 3");
3710 var
->data
.explicit_component
= true;
3711 var
->data
.location_frac
= qual_component
;
3715 } else if (qual
->flags
.q
.explicit_index
) {
3716 if (!qual
->subroutine_list
)
3717 _mesa_glsl_error(loc
, state
,
3718 "explicit index requires explicit location");
3719 } else if (qual
->flags
.q
.explicit_component
) {
3720 _mesa_glsl_error(loc
, state
,
3721 "explicit component requires explicit location");
3724 if (qual
->flags
.q
.explicit_binding
) {
3725 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3728 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3729 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3730 unsigned qual_stream
;
3731 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3733 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3734 var
->data
.stream
= qual_stream
;
3738 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3739 unsigned qual_xfb_buffer
;
3740 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3741 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3742 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3743 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3744 if (qual
->flags
.q
.explicit_xfb_buffer
)
3745 var
->data
.explicit_xfb_buffer
= true;
3749 if (qual
->flags
.q
.explicit_xfb_offset
) {
3750 unsigned qual_xfb_offset
;
3751 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3753 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3754 qual
->offset
, &qual_xfb_offset
) &&
3755 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3756 var
->type
, component_size
)) {
3757 var
->data
.offset
= qual_xfb_offset
;
3758 var
->data
.explicit_xfb_offset
= true;
3762 if (qual
->flags
.q
.explicit_xfb_stride
) {
3763 unsigned qual_xfb_stride
;
3764 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3765 qual
->xfb_stride
, &qual_xfb_stride
)) {
3766 var
->data
.xfb_stride
= qual_xfb_stride
;
3767 var
->data
.explicit_xfb_stride
= true;
3771 if (var
->type
->contains_atomic()) {
3772 if (var
->data
.mode
== ir_var_uniform
) {
3773 if (var
->data
.explicit_binding
) {
3775 &state
->atomic_counter_offsets
[var
->data
.binding
];
3777 if (*offset
% ATOMIC_COUNTER_SIZE
)
3778 _mesa_glsl_error(loc
, state
,
3779 "misaligned atomic counter offset");
3781 var
->data
.offset
= *offset
;
3782 *offset
+= var
->type
->atomic_size();
3785 _mesa_glsl_error(loc
, state
,
3786 "atomic counters require explicit binding point");
3788 } else if (var
->data
.mode
!= ir_var_function_in
) {
3789 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3790 "function parameters or uniform-qualified "
3791 "global variables");
3795 if (var
->type
->contains_sampler() &&
3796 !validate_storage_for_sampler_image_types(var
, state
, loc
))
3799 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3800 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3801 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3802 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3803 * These extensions and all following extensions that add the 'layout'
3804 * keyword have been modified to require the use of 'in' or 'out'.
3806 * The following extension do not allow the deprecated keywords:
3808 * GL_AMD_conservative_depth
3809 * GL_ARB_conservative_depth
3810 * GL_ARB_gpu_shader5
3811 * GL_ARB_separate_shader_objects
3812 * GL_ARB_tessellation_shader
3813 * GL_ARB_transform_feedback3
3814 * GL_ARB_uniform_buffer_object
3816 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3817 * allow layout with the deprecated keywords.
3819 const bool relaxed_layout_qualifier_checking
=
3820 state
->ARB_fragment_coord_conventions_enable
;
3822 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3823 || qual
->flags
.q
.varying
;
3824 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3825 if (relaxed_layout_qualifier_checking
) {
3826 _mesa_glsl_warning(loc
, state
,
3827 "`layout' qualifier may not be used with "
3828 "`attribute' or `varying'");
3830 _mesa_glsl_error(loc
, state
,
3831 "`layout' qualifier may not be used with "
3832 "`attribute' or `varying'");
3836 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3837 * AMD_conservative_depth.
3839 if (qual
->flags
.q
.depth_type
3840 && !state
->is_version(420, 0)
3841 && !state
->AMD_conservative_depth_enable
3842 && !state
->ARB_conservative_depth_enable
) {
3843 _mesa_glsl_error(loc
, state
,
3844 "extension GL_AMD_conservative_depth or "
3845 "GL_ARB_conservative_depth must be enabled "
3846 "to use depth layout qualifiers");
3847 } else if (qual
->flags
.q
.depth_type
3848 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3849 _mesa_glsl_error(loc
, state
,
3850 "depth layout qualifiers can be applied only to "
3854 switch (qual
->depth_type
) {
3856 var
->data
.depth_layout
= ir_depth_layout_any
;
3858 case ast_depth_greater
:
3859 var
->data
.depth_layout
= ir_depth_layout_greater
;
3861 case ast_depth_less
:
3862 var
->data
.depth_layout
= ir_depth_layout_less
;
3864 case ast_depth_unchanged
:
3865 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3868 var
->data
.depth_layout
= ir_depth_layout_none
;
3872 if (qual
->flags
.q
.std140
||
3873 qual
->flags
.q
.std430
||
3874 qual
->flags
.q
.packed
||
3875 qual
->flags
.q
.shared
) {
3876 _mesa_glsl_error(loc
, state
,
3877 "uniform and shader storage block layout qualifiers "
3878 "std140, std430, packed, and shared can only be "
3879 "applied to uniform or shader storage blocks, not "
3883 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3884 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3887 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3890 * "Fragment shaders also allow the following layout qualifier on in only
3891 * (not with variable declarations)
3892 * layout-qualifier-id
3893 * early_fragment_tests
3896 if (qual
->flags
.q
.early_fragment_tests
) {
3897 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3898 "valid in fragment shader input layout declaration.");
3901 if (qual
->flags
.q
.inner_coverage
) {
3902 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3903 "valid in fragment shader input layout declaration.");
3906 if (qual
->flags
.q
.post_depth_coverage
) {
3907 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3908 "valid in fragment shader input layout declaration.");
3911 if (state
->has_bindless())
3912 apply_bindless_qualifier_to_variable(qual
, var
, state
, loc
);
3914 if (qual
->flags
.q
.pixel_interlock_ordered
||
3915 qual
->flags
.q
.pixel_interlock_unordered
||
3916 qual
->flags
.q
.sample_interlock_ordered
||
3917 qual
->flags
.q
.sample_interlock_unordered
) {
3918 _mesa_glsl_error(loc
, state
, "interlock layout qualifiers: "
3919 "pixel_interlock_ordered, pixel_interlock_unordered, "
3920 "sample_interlock_ordered and sample_interlock_unordered, "
3921 "only valid in fragment shader input layout declaration.");
3926 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3928 struct _mesa_glsl_parse_state
*state
,
3932 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3934 if (qual
->flags
.q
.invariant
) {
3935 if (var
->data
.used
) {
3936 _mesa_glsl_error(loc
, state
,
3937 "variable `%s' may not be redeclared "
3938 "`invariant' after being used",
3941 var
->data
.invariant
= 1;
3945 if (qual
->flags
.q
.precise
) {
3946 if (var
->data
.used
) {
3947 _mesa_glsl_error(loc
, state
,
3948 "variable `%s' may not be redeclared "
3949 "`precise' after being used",
3952 var
->data
.precise
= 1;
3956 if (qual
->is_subroutine_decl() && !qual
->flags
.q
.uniform
) {
3957 _mesa_glsl_error(loc
, state
,
3958 "`subroutine' may only be applied to uniforms, "
3959 "subroutine type declarations, or function definitions");
3962 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3963 || qual
->flags
.q
.uniform
3964 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3965 var
->data
.read_only
= 1;
3967 if (qual
->flags
.q
.centroid
)
3968 var
->data
.centroid
= 1;
3970 if (qual
->flags
.q
.sample
)
3971 var
->data
.sample
= 1;
3973 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3974 if (state
->es_shader
) {
3975 var
->data
.precision
=
3976 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3979 if (qual
->flags
.q
.patch
)
3980 var
->data
.patch
= 1;
3982 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3983 var
->type
= glsl_type::error_type
;
3984 _mesa_glsl_error(loc
, state
,
3985 "`attribute' variables may not be declared in the "
3987 _mesa_shader_stage_to_string(state
->stage
));
3990 /* Disallow layout qualifiers which may only appear on layout declarations. */
3991 if (qual
->flags
.q
.prim_type
) {
3992 _mesa_glsl_error(loc
, state
,
3993 "Primitive type may only be specified on GS input or output "
3994 "layout declaration, not on variables.");
3997 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3999 * "However, the const qualifier cannot be used with out or inout."
4001 * The same section of the GLSL 4.40 spec further clarifies this saying:
4003 * "The const qualifier cannot be used with out or inout, or a
4004 * compile-time error results."
4006 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
4007 _mesa_glsl_error(loc
, state
,
4008 "`const' may not be applied to `out' or `inout' "
4009 "function parameters");
4012 /* If there is no qualifier that changes the mode of the variable, leave
4013 * the setting alone.
4015 assert(var
->data
.mode
!= ir_var_temporary
);
4016 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
4017 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
4018 else if (qual
->flags
.q
.in
)
4019 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
4020 else if (qual
->flags
.q
.attribute
4021 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
4022 var
->data
.mode
= ir_var_shader_in
;
4023 else if (qual
->flags
.q
.out
)
4024 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
4025 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
4026 var
->data
.mode
= ir_var_shader_out
;
4027 else if (qual
->flags
.q
.uniform
)
4028 var
->data
.mode
= ir_var_uniform
;
4029 else if (qual
->flags
.q
.buffer
)
4030 var
->data
.mode
= ir_var_shader_storage
;
4031 else if (qual
->flags
.q
.shared_storage
)
4032 var
->data
.mode
= ir_var_shader_shared
;
4034 if (!is_parameter
&& state
->has_framebuffer_fetch() &&
4035 state
->stage
== MESA_SHADER_FRAGMENT
) {
4036 if (state
->is_version(130, 300))
4037 var
->data
.fb_fetch_output
= qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
4039 var
->data
.fb_fetch_output
= (strcmp(var
->name
, "gl_LastFragData") == 0);
4042 if (var
->data
.fb_fetch_output
) {
4043 var
->data
.assigned
= true;
4044 var
->data
.memory_coherent
= !qual
->flags
.q
.non_coherent
;
4046 /* From the EXT_shader_framebuffer_fetch spec:
4048 * "It is an error to declare an inout fragment output not qualified
4049 * with layout(noncoherent) if the GL_EXT_shader_framebuffer_fetch
4050 * extension hasn't been enabled."
4052 if (var
->data
.memory_coherent
&&
4053 !state
->EXT_shader_framebuffer_fetch_enable
)
4054 _mesa_glsl_error(loc
, state
,
4055 "invalid declaration of framebuffer fetch output not "
4056 "qualified with layout(noncoherent)");
4059 /* From the EXT_shader_framebuffer_fetch spec:
4061 * "Fragment outputs declared inout may specify the following layout
4062 * qualifier: [...] noncoherent"
4064 if (qual
->flags
.q
.non_coherent
)
4065 _mesa_glsl_error(loc
, state
,
4066 "invalid layout(noncoherent) qualifier not part of "
4067 "framebuffer fetch output declaration");
4070 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
4071 /* User-defined ins/outs are not permitted in compute shaders. */
4072 if (state
->stage
== MESA_SHADER_COMPUTE
) {
4073 _mesa_glsl_error(loc
, state
,
4074 "user-defined input and output variables are not "
4075 "permitted in compute shaders");
4078 /* This variable is being used to link data between shader stages (in
4079 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
4080 * that is allowed for such purposes.
4082 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
4084 * "The varying qualifier can be used only with the data types
4085 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
4088 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
4089 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
4091 * "Fragment inputs can only be signed and unsigned integers and
4092 * integer vectors, float, floating-point vectors, matrices, or
4093 * arrays of these. Structures cannot be input.
4095 * Similar text exists in the section on vertex shader outputs.
4097 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
4098 * 3.00 spec allows structs as well. Varying structs are also allowed
4101 * From section 4.3.4 of the ARB_bindless_texture spec:
4103 * "(modify third paragraph of the section to allow sampler and image
4104 * types) ... Vertex shader inputs can only be float,
4105 * single-precision floating-point scalars, single-precision
4106 * floating-point vectors, matrices, signed and unsigned integers
4107 * and integer vectors, sampler and image types."
4109 * From section 4.3.6 of the ARB_bindless_texture spec:
4111 * "Output variables can only be floating-point scalars,
4112 * floating-point vectors, matrices, signed or unsigned integers or
4113 * integer vectors, sampler or image types, or arrays or structures
4116 switch (var
->type
->without_array()->base_type
) {
4117 case GLSL_TYPE_FLOAT
:
4118 /* Ok in all GLSL versions */
4120 case GLSL_TYPE_UINT
:
4122 if (state
->is_version(130, 300))
4124 _mesa_glsl_error(loc
, state
,
4125 "varying variables must be of base type float in %s",
4126 state
->get_version_string());
4128 case GLSL_TYPE_STRUCT
:
4129 if (state
->is_version(150, 300))
4131 _mesa_glsl_error(loc
, state
,
4132 "varying variables may not be of type struct");
4134 case GLSL_TYPE_DOUBLE
:
4135 case GLSL_TYPE_UINT64
:
4136 case GLSL_TYPE_INT64
:
4138 case GLSL_TYPE_SAMPLER
:
4139 case GLSL_TYPE_IMAGE
:
4140 if (state
->has_bindless())
4144 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
4149 if (state
->all_invariant
&& var
->data
.mode
== ir_var_shader_out
)
4150 var
->data
.invariant
= true;
4152 var
->data
.interpolation
=
4153 interpret_interpolation_qualifier(qual
, var
->type
,
4154 (ir_variable_mode
) var
->data
.mode
,
4157 /* Does the declaration use the deprecated 'attribute' or 'varying'
4160 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
4161 || qual
->flags
.q
.varying
;
4164 /* Validate auxiliary storage qualifiers */
4166 /* From section 4.3.4 of the GLSL 1.30 spec:
4167 * "It is an error to use centroid in in a vertex shader."
4169 * From section 4.3.4 of the GLSL ES 3.00 spec:
4170 * "It is an error to use centroid in or interpolation qualifiers in
4171 * a vertex shader input."
4174 /* Section 4.3.6 of the GLSL 1.30 specification states:
4175 * "It is an error to use centroid out in a fragment shader."
4177 * The GL_ARB_shading_language_420pack extension specification states:
4178 * "It is an error to use auxiliary storage qualifiers or interpolation
4179 * qualifiers on an output in a fragment shader."
4181 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
4182 _mesa_glsl_error(loc
, state
,
4183 "sample qualifier may only be used on `in` or `out` "
4184 "variables between shader stages");
4186 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
4187 _mesa_glsl_error(loc
, state
,
4188 "centroid qualifier may only be used with `in', "
4189 "`out' or `varying' variables between shader stages");
4192 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
4193 _mesa_glsl_error(loc
, state
,
4194 "the shared storage qualifiers can only be used with "
4198 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
4202 * Get the variable that is being redeclared by this declaration or if it
4203 * does not exist, the current declared variable.
4205 * Semantic checks to verify the validity of the redeclaration are also
4206 * performed. If semantic checks fail, compilation error will be emitted via
4207 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
4210 * A pointer to an existing variable in the current scope if the declaration
4211 * is a redeclaration, current variable otherwise. \c is_declared boolean
4212 * will return \c true if the declaration is a redeclaration, \c false
4215 static ir_variable
*
4216 get_variable_being_redeclared(ir_variable
**var_ptr
, YYLTYPE loc
,
4217 struct _mesa_glsl_parse_state
*state
,
4218 bool allow_all_redeclarations
,
4219 bool *is_redeclaration
)
4221 ir_variable
*var
= *var_ptr
;
4223 /* Check if this declaration is actually a re-declaration, either to
4224 * resize an array or add qualifiers to an existing variable.
4226 * This is allowed for variables in the current scope, or when at
4227 * global scope (for built-ins in the implicit outer scope).
4229 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
4230 if (earlier
== NULL
||
4231 (state
->current_function
!= NULL
&&
4232 !state
->symbols
->name_declared_this_scope(var
->name
))) {
4233 *is_redeclaration
= false;
4237 *is_redeclaration
= true;
4239 if (earlier
->data
.how_declared
== ir_var_declared_implicitly
) {
4240 /* Verify that the redeclaration of a built-in does not change the
4241 * storage qualifier. There are a couple special cases.
4243 * 1. Some built-in variables that are defined as 'in' in the
4244 * specification are implemented as system values. Allow
4245 * ir_var_system_value -> ir_var_shader_in.
4247 * 2. gl_LastFragData is implemented as a ir_var_shader_out, but the
4248 * specification requires that redeclarations omit any qualifier.
4249 * Allow ir_var_shader_out -> ir_var_auto for this one variable.
4251 if (earlier
->data
.mode
!= var
->data
.mode
&&
4252 !(earlier
->data
.mode
== ir_var_system_value
&&
4253 var
->data
.mode
== ir_var_shader_in
) &&
4254 !(strcmp(var
->name
, "gl_LastFragData") == 0 &&
4255 var
->data
.mode
== ir_var_auto
)) {
4256 _mesa_glsl_error(&loc
, state
,
4257 "redeclaration cannot change qualification of `%s'",
4262 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4264 * "It is legal to declare an array without a size and then
4265 * later re-declare the same name as an array of the same
4266 * type and specify a size."
4268 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4269 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4270 const int size
= var
->type
->array_size();
4271 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4272 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4273 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4275 earlier
->data
.max_array_access
);
4278 earlier
->type
= var
->type
;
4282 } else if (earlier
->type
!= var
->type
) {
4283 _mesa_glsl_error(&loc
, state
,
4284 "redeclaration of `%s' has incorrect type",
4286 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4287 state
->is_version(150, 0))
4288 && strcmp(var
->name
, "gl_FragCoord") == 0) {
4289 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4292 * We don't really need to do anything here, just allow the
4293 * redeclaration. Any error on the gl_FragCoord is handled on the ast
4294 * level at apply_layout_qualifier_to_variable using the
4295 * ast_type_qualifier and _mesa_glsl_parse_state, or later at
4298 /* According to section 4.3.7 of the GLSL 1.30 spec,
4299 * the following built-in varaibles can be redeclared with an
4300 * interpolation qualifier:
4303 * * gl_FrontSecondaryColor
4304 * * gl_BackSecondaryColor
4306 * * gl_SecondaryColor
4308 } else if (state
->is_version(130, 0)
4309 && (strcmp(var
->name
, "gl_FrontColor") == 0
4310 || strcmp(var
->name
, "gl_BackColor") == 0
4311 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4312 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4313 || strcmp(var
->name
, "gl_Color") == 0
4314 || strcmp(var
->name
, "gl_SecondaryColor") == 0)) {
4315 earlier
->data
.interpolation
= var
->data
.interpolation
;
4317 /* Layout qualifiers for gl_FragDepth. */
4318 } else if ((state
->is_version(420, 0) ||
4319 state
->AMD_conservative_depth_enable
||
4320 state
->ARB_conservative_depth_enable
)
4321 && strcmp(var
->name
, "gl_FragDepth") == 0) {
4323 /** From the AMD_conservative_depth spec:
4324 * Within any shader, the first redeclarations of gl_FragDepth
4325 * must appear before any use of gl_FragDepth.
4327 if (earlier
->data
.used
) {
4328 _mesa_glsl_error(&loc
, state
,
4329 "the first redeclaration of gl_FragDepth "
4330 "must appear before any use of gl_FragDepth");
4333 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4334 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4335 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4336 _mesa_glsl_error(&loc
, state
,
4337 "gl_FragDepth: depth layout is declared here "
4338 "as '%s, but it was previously declared as "
4340 depth_layout_string(var
->data
.depth_layout
),
4341 depth_layout_string(earlier
->data
.depth_layout
));
4344 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4346 } else if (state
->has_framebuffer_fetch() &&
4347 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4348 var
->data
.mode
== ir_var_auto
) {
4349 /* According to the EXT_shader_framebuffer_fetch spec:
4351 * "By default, gl_LastFragData is declared with the mediump precision
4352 * qualifier. This can be changed by redeclaring the corresponding
4353 * variables with the desired precision qualifier."
4355 * "Fragment shaders may specify the following layout qualifier only for
4356 * redeclaring the built-in gl_LastFragData array [...]: noncoherent"
4358 earlier
->data
.precision
= var
->data
.precision
;
4359 earlier
->data
.memory_coherent
= var
->data
.memory_coherent
;
4361 } else if ((earlier
->data
.how_declared
== ir_var_declared_implicitly
&&
4362 state
->allow_builtin_variable_redeclaration
) ||
4363 allow_all_redeclarations
) {
4364 /* Allow verbatim redeclarations of built-in variables. Not explicitly
4365 * valid, but some applications do it.
4368 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4375 * Generate the IR for an initializer in a variable declaration
4378 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4379 ast_fully_specified_type
*type
,
4380 exec_list
*initializer_instructions
,
4381 struct _mesa_glsl_parse_state
*state
)
4383 void *mem_ctx
= state
;
4384 ir_rvalue
*result
= NULL
;
4386 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4388 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4390 * "All uniform variables are read-only and are initialized either
4391 * directly by an application via API commands, or indirectly by
4394 if (var
->data
.mode
== ir_var_uniform
) {
4395 state
->check_version(120, 0, &initializer_loc
,
4396 "cannot initialize uniform %s",
4400 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4402 * "Buffer variables cannot have initializers."
4404 if (var
->data
.mode
== ir_var_shader_storage
) {
4405 _mesa_glsl_error(&initializer_loc
, state
,
4406 "cannot initialize buffer variable %s",
4410 /* From section 4.1.7 of the GLSL 4.40 spec:
4412 * "Opaque variables [...] are initialized only through the
4413 * OpenGL API; they cannot be declared with an initializer in a
4416 * From section 4.1.7 of the ARB_bindless_texture spec:
4418 * "Samplers may be declared as shader inputs and outputs, as uniform
4419 * variables, as temporary variables, and as function parameters."
4421 * From section 4.1.X of the ARB_bindless_texture spec:
4423 * "Images may be declared as shader inputs and outputs, as uniform
4424 * variables, as temporary variables, and as function parameters."
4426 if (var
->type
->contains_atomic() ||
4427 (!state
->has_bindless() && var
->type
->contains_opaque())) {
4428 _mesa_glsl_error(&initializer_loc
, state
,
4429 "cannot initialize %s variable %s",
4430 var
->name
, state
->has_bindless() ? "atomic" : "opaque");
4433 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4434 _mesa_glsl_error(&initializer_loc
, state
,
4435 "cannot initialize %s shader input / %s %s",
4436 _mesa_shader_stage_to_string(state
->stage
),
4437 (state
->stage
== MESA_SHADER_VERTEX
)
4438 ? "attribute" : "varying",
4442 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4443 _mesa_glsl_error(&initializer_loc
, state
,
4444 "cannot initialize %s shader output %s",
4445 _mesa_shader_stage_to_string(state
->stage
),
4449 /* If the initializer is an ast_aggregate_initializer, recursively store
4450 * type information from the LHS into it, so that its hir() function can do
4453 if (decl
->initializer
->oper
== ast_aggregate
)
4454 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4456 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4457 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4459 /* Calculate the constant value if this is a const or uniform
4462 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4464 * "Declarations of globals without a storage qualifier, or with
4465 * just the const qualifier, may include initializers, in which case
4466 * they will be initialized before the first line of main() is
4467 * executed. Such initializers must be a constant expression."
4469 * The same section of the GLSL ES 3.00.4 spec has similar language.
4471 if (type
->qualifier
.flags
.q
.constant
4472 || type
->qualifier
.flags
.q
.uniform
4473 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4474 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4476 if (new_rhs
!= NULL
) {
4479 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4482 * "A constant expression is one of
4486 * - an expression formed by an operator on operands that are
4487 * all constant expressions, including getting an element of
4488 * a constant array, or a field of a constant structure, or
4489 * components of a constant vector. However, the sequence
4490 * operator ( , ) and the assignment operators ( =, +=, ...)
4491 * are not included in the operators that can create a
4492 * constant expression."
4494 * Section 12.43 (Sequence operator and constant expressions) says:
4496 * "Should the following construct be allowed?
4500 * The expression within the brackets uses the sequence operator
4501 * (',') and returns the integer 3 so the construct is declaring
4502 * a single-dimensional array of size 3. In some languages, the
4503 * construct declares a two-dimensional array. It would be
4504 * preferable to make this construct illegal to avoid confusion.
4506 * One possibility is to change the definition of the sequence
4507 * operator so that it does not return a constant-expression and
4508 * hence cannot be used to declare an array size.
4510 * RESOLUTION: The result of a sequence operator is not a
4511 * constant-expression."
4513 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4514 * contains language almost identical to the section 4.3.3 in the
4515 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4518 ir_constant
*constant_value
=
4519 rhs
->constant_expression_value(mem_ctx
);
4521 if (!constant_value
||
4522 (state
->is_version(430, 300) &&
4523 decl
->initializer
->has_sequence_subexpression())) {
4524 const char *const variable_mode
=
4525 (type
->qualifier
.flags
.q
.constant
)
4527 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4529 /* If ARB_shading_language_420pack is enabled, initializers of
4530 * const-qualified local variables do not have to be constant
4531 * expressions. Const-qualified global variables must still be
4532 * initialized with constant expressions.
4534 if (!state
->has_420pack()
4535 || state
->current_function
== NULL
) {
4536 _mesa_glsl_error(& initializer_loc
, state
,
4537 "initializer of %s variable `%s' must be a "
4538 "constant expression",
4541 if (var
->type
->is_numeric()) {
4542 /* Reduce cascading errors. */
4543 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4544 ? ir_constant::zero(state
, var
->type
) : NULL
;
4548 rhs
= constant_value
;
4549 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4550 ? constant_value
: NULL
;
4553 if (var
->type
->is_numeric()) {
4554 /* Reduce cascading errors. */
4555 rhs
= var
->constant_value
= type
->qualifier
.flags
.q
.constant
4556 ? ir_constant::zero(state
, var
->type
) : NULL
;
4561 if (rhs
&& !rhs
->type
->is_error()) {
4562 bool temp
= var
->data
.read_only
;
4563 if (type
->qualifier
.flags
.q
.constant
)
4564 var
->data
.read_only
= false;
4566 /* Never emit code to initialize a uniform.
4568 const glsl_type
*initializer_type
;
4569 bool error_emitted
= false;
4570 if (!type
->qualifier
.flags
.q
.uniform
) {
4572 do_assignment(initializer_instructions
, state
,
4574 &result
, true, true,
4575 type
->get_location());
4576 initializer_type
= result
->type
;
4578 initializer_type
= rhs
->type
;
4580 if (!error_emitted
) {
4581 var
->constant_initializer
= rhs
->constant_expression_value(mem_ctx
);
4582 var
->data
.has_initializer
= true;
4584 /* If the declared variable is an unsized array, it must inherrit
4585 * its full type from the initializer. A declaration such as
4587 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4591 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4593 * The assignment generated in the if-statement (below) will also
4594 * automatically handle this case for non-uniforms.
4596 * If the declared variable is not an array, the types must
4597 * already match exactly. As a result, the type assignment
4598 * here can be done unconditionally. For non-uniforms the call
4599 * to do_assignment can change the type of the initializer (via
4600 * the implicit conversion rules). For uniforms the initializer
4601 * must be a constant expression, and the type of that expression
4602 * was validated above.
4604 var
->type
= initializer_type
;
4607 var
->data
.read_only
= temp
;
4614 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4615 YYLTYPE loc
, ir_variable
*var
,
4616 unsigned num_vertices
,
4618 const char *var_category
)
4620 if (var
->type
->is_unsized_array()) {
4621 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4623 * All geometry shader input unsized array declarations will be
4624 * sized by an earlier input layout qualifier, when present, as per
4625 * the following table.
4627 * Followed by a table mapping each allowed input layout qualifier to
4628 * the corresponding input length.
4630 * Similarly for tessellation control shader outputs.
4632 if (num_vertices
!= 0)
4633 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4636 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4637 * includes the following examples of compile-time errors:
4639 * // code sequence within one shader...
4640 * in vec4 Color1[]; // size unknown
4641 * ...Color1.length()...// illegal, length() unknown
4642 * in vec4 Color2[2]; // size is 2
4643 * ...Color1.length()...// illegal, Color1 still has no size
4644 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4645 * layout(lines) in; // legal, input size is 2, matching
4646 * in vec4 Color4[3]; // illegal, contradicts layout
4649 * To detect the case illustrated by Color3, we verify that the size of
4650 * an explicitly-sized array matches the size of any previously declared
4651 * explicitly-sized array. To detect the case illustrated by Color4, we
4652 * verify that the size of an explicitly-sized array is consistent with
4653 * any previously declared input layout.
4655 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4656 _mesa_glsl_error(&loc
, state
,
4657 "%s size contradicts previously declared layout "
4658 "(size is %u, but layout requires a size of %u)",
4659 var_category
, var
->type
->length
, num_vertices
);
4660 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4661 _mesa_glsl_error(&loc
, state
,
4662 "%s sizes are inconsistent (size is %u, but a "
4663 "previous declaration has size %u)",
4664 var_category
, var
->type
->length
, *size
);
4666 *size
= var
->type
->length
;
4672 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4673 YYLTYPE loc
, ir_variable
*var
)
4675 unsigned num_vertices
= 0;
4677 if (state
->tcs_output_vertices_specified
) {
4678 if (!state
->out_qualifier
->vertices
->
4679 process_qualifier_constant(state
, "vertices",
4680 &num_vertices
, false)) {
4684 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4685 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4686 "GL_MAX_PATCH_VERTICES", num_vertices
);
4691 if (!var
->type
->is_array() && !var
->data
.patch
) {
4692 _mesa_glsl_error(&loc
, state
,
4693 "tessellation control shader outputs must be arrays");
4695 /* To avoid cascading failures, short circuit the checks below. */
4699 if (var
->data
.patch
)
4702 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4703 &state
->tcs_output_size
,
4704 "tessellation control shader output");
4708 * Do additional processing necessary for tessellation control/evaluation shader
4709 * input declarations. This covers both interface block arrays and bare input
4713 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4714 YYLTYPE loc
, ir_variable
*var
)
4716 if (!var
->type
->is_array() && !var
->data
.patch
) {
4717 _mesa_glsl_error(&loc
, state
,
4718 "per-vertex tessellation shader inputs must be arrays");
4719 /* Avoid cascading failures. */
4723 if (var
->data
.patch
)
4726 /* The ARB_tessellation_shader spec says:
4728 * "Declaring an array size is optional. If no size is specified, it
4729 * will be taken from the implementation-dependent maximum patch size
4730 * (gl_MaxPatchVertices). If a size is specified, it must match the
4731 * maximum patch size; otherwise, a compile or link error will occur."
4733 * This text appears twice, once for TCS inputs, and again for TES inputs.
4735 if (var
->type
->is_unsized_array()) {
4736 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4737 state
->Const
.MaxPatchVertices
);
4738 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4739 _mesa_glsl_error(&loc
, state
,
4740 "per-vertex tessellation shader input arrays must be "
4741 "sized to gl_MaxPatchVertices (%d).",
4742 state
->Const
.MaxPatchVertices
);
4748 * Do additional processing necessary for geometry shader input declarations
4749 * (this covers both interface blocks arrays and bare input variables).
4752 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4753 YYLTYPE loc
, ir_variable
*var
)
4755 unsigned num_vertices
= 0;
4757 if (state
->gs_input_prim_type_specified
) {
4758 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4761 /* Geometry shader input variables must be arrays. Caller should have
4762 * reported an error for this.
4764 if (!var
->type
->is_array()) {
4765 assert(state
->error
);
4767 /* To avoid cascading failures, short circuit the checks below. */
4771 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4772 &state
->gs_input_size
,
4773 "geometry shader input");
4777 validate_identifier(const char *identifier
, YYLTYPE loc
,
4778 struct _mesa_glsl_parse_state
*state
)
4780 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4782 * "Identifiers starting with "gl_" are reserved for use by
4783 * OpenGL, and may not be declared in a shader as either a
4784 * variable or a function."
4786 if (is_gl_identifier(identifier
)) {
4787 _mesa_glsl_error(&loc
, state
,
4788 "identifier `%s' uses reserved `gl_' prefix",
4790 } else if (strstr(identifier
, "__")) {
4791 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4794 * "In addition, all identifiers containing two
4795 * consecutive underscores (__) are reserved as
4796 * possible future keywords."
4798 * The intention is that names containing __ are reserved for internal
4799 * use by the implementation, and names prefixed with GL_ are reserved
4800 * for use by Khronos. Names simply containing __ are dangerous to use,
4801 * but should be allowed.
4803 * A future version of the GLSL specification will clarify this.
4805 _mesa_glsl_warning(&loc
, state
,
4806 "identifier `%s' uses reserved `__' string",
4812 ast_declarator_list::hir(exec_list
*instructions
,
4813 struct _mesa_glsl_parse_state
*state
)
4816 const struct glsl_type
*decl_type
;
4817 const char *type_name
= NULL
;
4818 ir_rvalue
*result
= NULL
;
4819 YYLTYPE loc
= this->get_location();
4821 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4823 * "To ensure that a particular output variable is invariant, it is
4824 * necessary to use the invariant qualifier. It can either be used to
4825 * qualify a previously declared variable as being invariant
4827 * invariant gl_Position; // make existing gl_Position be invariant"
4829 * In these cases the parser will set the 'invariant' flag in the declarator
4830 * list, and the type will be NULL.
4832 if (this->invariant
) {
4833 assert(this->type
== NULL
);
4835 if (state
->current_function
!= NULL
) {
4836 _mesa_glsl_error(& loc
, state
,
4837 "all uses of `invariant' keyword must be at global "
4841 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4842 assert(decl
->array_specifier
== NULL
);
4843 assert(decl
->initializer
== NULL
);
4845 ir_variable
*const earlier
=
4846 state
->symbols
->get_variable(decl
->identifier
);
4847 if (earlier
== NULL
) {
4848 _mesa_glsl_error(& loc
, state
,
4849 "undeclared variable `%s' cannot be marked "
4850 "invariant", decl
->identifier
);
4851 } else if (!is_allowed_invariant(earlier
, state
)) {
4852 _mesa_glsl_error(&loc
, state
,
4853 "`%s' cannot be marked invariant; interfaces between "
4854 "shader stages only.", decl
->identifier
);
4855 } else if (earlier
->data
.used
) {
4856 _mesa_glsl_error(& loc
, state
,
4857 "variable `%s' may not be redeclared "
4858 "`invariant' after being used",
4861 earlier
->data
.invariant
= true;
4865 /* Invariant redeclarations do not have r-values.
4870 if (this->precise
) {
4871 assert(this->type
== NULL
);
4873 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4874 assert(decl
->array_specifier
== NULL
);
4875 assert(decl
->initializer
== NULL
);
4877 ir_variable
*const earlier
=
4878 state
->symbols
->get_variable(decl
->identifier
);
4879 if (earlier
== NULL
) {
4880 _mesa_glsl_error(& loc
, state
,
4881 "undeclared variable `%s' cannot be marked "
4882 "precise", decl
->identifier
);
4883 } else if (state
->current_function
!= NULL
&&
4884 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4885 /* Note: we have to check if we're in a function, since
4886 * builtins are treated as having come from another scope.
4888 _mesa_glsl_error(& loc
, state
,
4889 "variable `%s' from an outer scope may not be "
4890 "redeclared `precise' in this scope",
4892 } else if (earlier
->data
.used
) {
4893 _mesa_glsl_error(& loc
, state
,
4894 "variable `%s' may not be redeclared "
4895 "`precise' after being used",
4898 earlier
->data
.precise
= true;
4902 /* Precise redeclarations do not have r-values either. */
4906 assert(this->type
!= NULL
);
4907 assert(!this->invariant
);
4908 assert(!this->precise
);
4910 /* The type specifier may contain a structure definition. Process that
4911 * before any of the variable declarations.
4913 (void) this->type
->specifier
->hir(instructions
, state
);
4915 decl_type
= this->type
->glsl_type(& type_name
, state
);
4917 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4918 * "Buffer variables may only be declared inside interface blocks
4919 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4920 * shader storage blocks. It is a compile-time error to declare buffer
4921 * variables at global scope (outside a block)."
4923 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4924 _mesa_glsl_error(&loc
, state
,
4925 "buffer variables cannot be declared outside "
4926 "interface blocks");
4929 /* An offset-qualified atomic counter declaration sets the default
4930 * offset for the next declaration within the same atomic counter
4933 if (decl_type
&& decl_type
->contains_atomic()) {
4934 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4935 type
->qualifier
.flags
.q
.explicit_offset
) {
4936 unsigned qual_binding
;
4937 unsigned qual_offset
;
4938 if (process_qualifier_constant(state
, &loc
, "binding",
4939 type
->qualifier
.binding
,
4941 && process_qualifier_constant(state
, &loc
, "offset",
4942 type
->qualifier
.offset
,
4944 if (qual_binding
< ARRAY_SIZE(state
->atomic_counter_offsets
))
4945 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4949 ast_type_qualifier allowed_atomic_qual_mask
;
4950 allowed_atomic_qual_mask
.flags
.i
= 0;
4951 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4952 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4953 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4955 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4956 "invalid layout qualifier for",
4960 if (this->declarations
.is_empty()) {
4961 /* If there is no structure involved in the program text, there are two
4962 * possible scenarios:
4964 * - The program text contained something like 'vec4;'. This is an
4965 * empty declaration. It is valid but weird. Emit a warning.
4967 * - The program text contained something like 'S;' and 'S' is not the
4968 * name of a known structure type. This is both invalid and weird.
4971 * - The program text contained something like 'mediump float;'
4972 * when the programmer probably meant 'precision mediump
4973 * float;' Emit a warning with a description of what they
4974 * probably meant to do.
4976 * Note that if decl_type is NULL and there is a structure involved,
4977 * there must have been some sort of error with the structure. In this
4978 * case we assume that an error was already generated on this line of
4979 * code for the structure. There is no need to generate an additional,
4982 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4985 if (decl_type
== NULL
) {
4986 _mesa_glsl_error(&loc
, state
,
4987 "invalid type `%s' in empty declaration",
4990 if (decl_type
->is_array()) {
4991 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4994 * "... any declaration that leaves the size undefined is
4995 * disallowed as this would add complexity and there are no
4998 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4999 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
5000 "or implicitly defined");
5003 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
5005 * "The combinations of types and qualifiers that cause
5006 * compile-time or link-time errors are the same whether or not
5007 * the declaration is empty."
5009 validate_array_dimensions(decl_type
, state
, &loc
);
5012 if (decl_type
->is_atomic_uint()) {
5013 /* Empty atomic counter declarations are allowed and useful
5014 * to set the default offset qualifier.
5017 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5018 if (this->type
->specifier
->structure
!= NULL
) {
5019 _mesa_glsl_error(&loc
, state
,
5020 "precision qualifiers can't be applied "
5023 static const char *const precision_names
[] = {
5030 _mesa_glsl_warning(&loc
, state
,
5031 "empty declaration with precision "
5032 "qualifier, to set the default precision, "
5033 "use `precision %s %s;'",
5034 precision_names
[this->type
->
5035 qualifier
.precision
],
5038 } else if (this->type
->specifier
->structure
== NULL
) {
5039 _mesa_glsl_warning(&loc
, state
, "empty declaration");
5044 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
5045 const struct glsl_type
*var_type
;
5047 const char *identifier
= decl
->identifier
;
5048 /* FINISHME: Emit a warning if a variable declaration shadows a
5049 * FINISHME: declaration at a higher scope.
5052 if ((decl_type
== NULL
) || decl_type
->is_void()) {
5053 if (type_name
!= NULL
) {
5054 _mesa_glsl_error(& loc
, state
,
5055 "invalid type `%s' in declaration of `%s'",
5056 type_name
, decl
->identifier
);
5058 _mesa_glsl_error(& loc
, state
,
5059 "invalid type in declaration of `%s'",
5065 if (this->type
->qualifier
.is_subroutine_decl()) {
5069 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
5071 _mesa_glsl_error(& loc
, state
,
5072 "invalid type in declaration of `%s'",
5074 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
5079 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
5082 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
5084 /* The 'varying in' and 'varying out' qualifiers can only be used with
5085 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
5088 if (this->type
->qualifier
.flags
.q
.varying
) {
5089 if (this->type
->qualifier
.flags
.q
.in
) {
5090 _mesa_glsl_error(& loc
, state
,
5091 "`varying in' qualifier in declaration of "
5092 "`%s' only valid for geometry shaders using "
5093 "ARB_geometry_shader4 or EXT_geometry_shader4",
5095 } else if (this->type
->qualifier
.flags
.q
.out
) {
5096 _mesa_glsl_error(& loc
, state
,
5097 "`varying out' qualifier in declaration of "
5098 "`%s' only valid for geometry shaders using "
5099 "ARB_geometry_shader4 or EXT_geometry_shader4",
5104 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
5106 * "Global variables can only use the qualifiers const,
5107 * attribute, uniform, or varying. Only one may be
5110 * Local variables can only use the qualifier const."
5112 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
5113 * any extension that adds the 'layout' keyword.
5115 if (!state
->is_version(130, 300)
5116 && !state
->has_explicit_attrib_location()
5117 && !state
->has_separate_shader_objects()
5118 && !state
->ARB_fragment_coord_conventions_enable
) {
5119 if (this->type
->qualifier
.flags
.q
.out
) {
5120 _mesa_glsl_error(& loc
, state
,
5121 "`out' qualifier in declaration of `%s' "
5122 "only valid for function parameters in %s",
5123 decl
->identifier
, state
->get_version_string());
5125 if (this->type
->qualifier
.flags
.q
.in
) {
5126 _mesa_glsl_error(& loc
, state
,
5127 "`in' qualifier in declaration of `%s' "
5128 "only valid for function parameters in %s",
5129 decl
->identifier
, state
->get_version_string());
5131 /* FINISHME: Test for other invalid qualifiers. */
5134 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
5136 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
5139 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
5140 && (var
->type
->is_numeric() || var
->type
->is_boolean())
5141 && state
->zero_init
) {
5142 const ir_constant_data data
= { { 0 } };
5143 var
->data
.has_initializer
= true;
5144 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
5147 if (this->type
->qualifier
.flags
.q
.invariant
) {
5148 if (!is_allowed_invariant(var
, state
)) {
5149 _mesa_glsl_error(&loc
, state
,
5150 "`%s' cannot be marked invariant; interfaces between "
5151 "shader stages only", var
->name
);
5155 if (state
->current_function
!= NULL
) {
5156 const char *mode
= NULL
;
5157 const char *extra
= "";
5159 /* There is no need to check for 'inout' here because the parser will
5160 * only allow that in function parameter lists.
5162 if (this->type
->qualifier
.flags
.q
.attribute
) {
5164 } else if (this->type
->qualifier
.is_subroutine_decl()) {
5165 mode
= "subroutine uniform";
5166 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
5168 } else if (this->type
->qualifier
.flags
.q
.varying
) {
5170 } else if (this->type
->qualifier
.flags
.q
.in
) {
5172 extra
= " or in function parameter list";
5173 } else if (this->type
->qualifier
.flags
.q
.out
) {
5175 extra
= " or in function parameter list";
5179 _mesa_glsl_error(& loc
, state
,
5180 "%s variable `%s' must be declared at "
5182 mode
, var
->name
, extra
);
5184 } else if (var
->data
.mode
== ir_var_shader_in
) {
5185 var
->data
.read_only
= true;
5187 if (state
->stage
== MESA_SHADER_VERTEX
) {
5188 bool error_emitted
= false;
5190 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
5192 * "Vertex shader inputs can only be float, floating-point
5193 * vectors, matrices, signed and unsigned integers and integer
5194 * vectors. Vertex shader inputs can also form arrays of these
5195 * types, but not structures."
5197 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
5199 * "Vertex shader inputs can only be float, floating-point
5200 * vectors, matrices, signed and unsigned integers and integer
5201 * vectors. They cannot be arrays or structures."
5203 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
5205 * "The attribute qualifier can be used only with float,
5206 * floating-point vectors, and matrices. Attribute variables
5207 * cannot be declared as arrays or structures."
5209 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
5211 * "Vertex shader inputs can only be float, floating-point
5212 * vectors, matrices, signed and unsigned integers and integer
5213 * vectors. Vertex shader inputs cannot be arrays or
5216 * From section 4.3.4 of the ARB_bindless_texture spec:
5218 * "(modify third paragraph of the section to allow sampler and
5219 * image types) ... Vertex shader inputs can only be float,
5220 * single-precision floating-point scalars, single-precision
5221 * floating-point vectors, matrices, signed and unsigned
5222 * integers and integer vectors, sampler and image types."
5224 const glsl_type
*check_type
= var
->type
->without_array();
5226 switch (check_type
->base_type
) {
5227 case GLSL_TYPE_FLOAT
:
5229 case GLSL_TYPE_UINT64
:
5230 case GLSL_TYPE_INT64
:
5232 case GLSL_TYPE_UINT
:
5234 if (state
->is_version(120, 300))
5236 case GLSL_TYPE_DOUBLE
:
5237 if (check_type
->is_double() && (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
5239 case GLSL_TYPE_SAMPLER
:
5240 if (check_type
->is_sampler() && state
->has_bindless())
5242 case GLSL_TYPE_IMAGE
:
5243 if (check_type
->is_image() && state
->has_bindless())
5247 _mesa_glsl_error(& loc
, state
,
5248 "vertex shader input / attribute cannot have "
5250 var
->type
->is_array() ? "array of " : "",
5252 error_emitted
= true;
5255 if (!error_emitted
&& var
->type
->is_array() &&
5256 !state
->check_version(150, 0, &loc
,
5257 "vertex shader input / attribute "
5258 "cannot have array type")) {
5259 error_emitted
= true;
5261 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
5262 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5264 * Geometry shader input variables get the per-vertex values
5265 * written out by vertex shader output variables of the same
5266 * names. Since a geometry shader operates on a set of
5267 * vertices, each input varying variable (or input block, see
5268 * interface blocks below) needs to be declared as an array.
5270 if (!var
->type
->is_array()) {
5271 _mesa_glsl_error(&loc
, state
,
5272 "geometry shader inputs must be arrays");
5275 handle_geometry_shader_input_decl(state
, loc
, var
);
5276 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5277 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5279 * It is a compile-time error to declare a fragment shader
5280 * input with, or that contains, any of the following types:
5284 * * An array of arrays
5285 * * An array of structures
5286 * * A structure containing an array
5287 * * A structure containing a structure
5289 if (state
->es_shader
) {
5290 const glsl_type
*check_type
= var
->type
->without_array();
5291 if (check_type
->is_boolean() ||
5292 check_type
->contains_opaque()) {
5293 _mesa_glsl_error(&loc
, state
,
5294 "fragment shader input cannot have type %s",
5297 if (var
->type
->is_array() &&
5298 var
->type
->fields
.array
->is_array()) {
5299 _mesa_glsl_error(&loc
, state
,
5301 "cannot have an array of arrays",
5302 _mesa_shader_stage_to_string(state
->stage
));
5304 if (var
->type
->is_array() &&
5305 var
->type
->fields
.array
->is_record()) {
5306 _mesa_glsl_error(&loc
, state
,
5307 "fragment shader input "
5308 "cannot have an array of structs");
5310 if (var
->type
->is_record()) {
5311 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5312 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5313 var
->type
->fields
.structure
[i
].type
->is_record())
5314 _mesa_glsl_error(&loc
, state
,
5315 "fragment shader input cannot have "
5316 "a struct that contains an "
5321 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5322 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5323 handle_tess_shader_input_decl(state
, loc
, var
);
5325 } else if (var
->data
.mode
== ir_var_shader_out
) {
5326 const glsl_type
*check_type
= var
->type
->without_array();
5328 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5330 * It is a compile-time error to declare a fragment shader output
5331 * that contains any of the following:
5333 * * A Boolean type (bool, bvec2 ...)
5334 * * A double-precision scalar or vector (double, dvec2 ...)
5339 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5340 if (check_type
->is_record() || check_type
->is_matrix())
5341 _mesa_glsl_error(&loc
, state
,
5342 "fragment shader output "
5343 "cannot have struct or matrix type");
5344 switch (check_type
->base_type
) {
5345 case GLSL_TYPE_UINT
:
5347 case GLSL_TYPE_FLOAT
:
5350 _mesa_glsl_error(&loc
, state
,
5351 "fragment shader output cannot have "
5352 "type %s", check_type
->name
);
5356 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5358 * It is a compile-time error to declare a vertex shader output
5359 * with, or that contains, any of the following types:
5363 * * An array of arrays
5364 * * An array of structures
5365 * * A structure containing an array
5366 * * A structure containing a structure
5368 * It is a compile-time error to declare a fragment shader output
5369 * with, or that contains, any of the following types:
5375 * * An array of array
5377 * ES 3.20 updates this to apply to tessellation and geometry shaders
5378 * as well. Because there are per-vertex arrays in the new stages,
5379 * it strikes the "array of..." rules and replaces them with these:
5381 * * For per-vertex-arrayed variables (applies to tessellation
5382 * control, tessellation evaluation and geometry shaders):
5384 * * Per-vertex-arrayed arrays of arrays
5385 * * Per-vertex-arrayed arrays of structures
5387 * * For non-per-vertex-arrayed variables:
5389 * * An array of arrays
5390 * * An array of structures
5392 * which basically says to unwrap the per-vertex aspect and apply
5395 if (state
->es_shader
) {
5396 if (var
->type
->is_array() &&
5397 var
->type
->fields
.array
->is_array()) {
5398 _mesa_glsl_error(&loc
, state
,
5400 "cannot have an array of arrays",
5401 _mesa_shader_stage_to_string(state
->stage
));
5403 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5404 const glsl_type
*type
= var
->type
;
5406 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5407 !var
->data
.patch
&& var
->type
->is_array()) {
5408 type
= var
->type
->fields
.array
;
5411 if (type
->is_array() && type
->fields
.array
->is_record()) {
5412 _mesa_glsl_error(&loc
, state
,
5413 "%s shader output cannot have "
5414 "an array of structs",
5415 _mesa_shader_stage_to_string(state
->stage
));
5417 if (type
->is_record()) {
5418 for (unsigned i
= 0; i
< type
->length
; i
++) {
5419 if (type
->fields
.structure
[i
].type
->is_array() ||
5420 type
->fields
.structure
[i
].type
->is_record())
5421 _mesa_glsl_error(&loc
, state
,
5422 "%s shader output cannot have a "
5423 "struct that contains an "
5425 _mesa_shader_stage_to_string(state
->stage
));
5431 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5432 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5434 } else if (var
->type
->contains_subroutine()) {
5435 /* declare subroutine uniforms as hidden */
5436 var
->data
.how_declared
= ir_var_hidden
;
5439 /* From section 4.3.4 of the GLSL 4.00 spec:
5440 * "Input variables may not be declared using the patch in qualifier
5441 * in tessellation control or geometry shaders."
5443 * From section 4.3.6 of the GLSL 4.00 spec:
5444 * "It is an error to use patch out in a vertex, tessellation
5445 * evaluation, or geometry shader."
5447 * This doesn't explicitly forbid using them in a fragment shader, but
5448 * that's probably just an oversight.
5450 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5451 && this->type
->qualifier
.flags
.q
.patch
5452 && this->type
->qualifier
.flags
.q
.in
) {
5454 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5455 "tessellation evaluation shader");
5458 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5459 && this->type
->qualifier
.flags
.q
.patch
5460 && this->type
->qualifier
.flags
.q
.out
) {
5462 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5463 "tessellation control shader");
5466 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5468 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5469 state
->check_precision_qualifiers_allowed(&loc
);
5472 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5473 !precision_qualifier_allowed(var
->type
)) {
5474 _mesa_glsl_error(&loc
, state
,
5475 "precision qualifiers apply only to floating point"
5476 ", integer and opaque types");
5479 /* From section 4.1.7 of the GLSL 4.40 spec:
5481 * "[Opaque types] can only be declared as function
5482 * parameters or uniform-qualified variables."
5484 * From section 4.1.7 of the ARB_bindless_texture spec:
5486 * "Samplers may be declared as shader inputs and outputs, as uniform
5487 * variables, as temporary variables, and as function parameters."
5489 * From section 4.1.X of the ARB_bindless_texture spec:
5491 * "Images may be declared as shader inputs and outputs, as uniform
5492 * variables, as temporary variables, and as function parameters."
5494 if (!this->type
->qualifier
.flags
.q
.uniform
&&
5495 (var_type
->contains_atomic() ||
5496 (!state
->has_bindless() && var_type
->contains_opaque()))) {
5497 _mesa_glsl_error(&loc
, state
,
5498 "%s variables must be declared uniform",
5499 state
->has_bindless() ? "atomic" : "opaque");
5502 /* Process the initializer and add its instructions to a temporary
5503 * list. This list will be added to the instruction stream (below) after
5504 * the declaration is added. This is done because in some cases (such as
5505 * redeclarations) the declaration may not actually be added to the
5506 * instruction stream.
5508 exec_list initializer_instructions
;
5510 /* Examine var name here since var may get deleted in the next call */
5511 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5513 bool is_redeclaration
;
5514 var
= get_variable_being_redeclared(&var
, decl
->get_location(), state
,
5515 false /* allow_all_redeclarations */,
5517 if (is_redeclaration
) {
5519 var
->data
.how_declared
== ir_var_declared_in_block
) {
5520 _mesa_glsl_error(&loc
, state
,
5521 "`%s' has already been redeclared using "
5522 "gl_PerVertex", var
->name
);
5524 var
->data
.how_declared
= ir_var_declared_normally
;
5527 if (decl
->initializer
!= NULL
) {
5528 result
= process_initializer(var
,
5530 &initializer_instructions
, state
);
5532 validate_array_dimensions(var_type
, state
, &loc
);
5535 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5537 * "It is an error to write to a const variable outside of
5538 * its declaration, so they must be initialized when
5541 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5542 _mesa_glsl_error(& loc
, state
,
5543 "const declaration of `%s' must be initialized",
5547 if (state
->es_shader
) {
5548 const glsl_type
*const t
= var
->type
;
5550 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5552 * The GL_OES_tessellation_shader spec says about inputs:
5554 * "Declaring an array size is optional. If no size is specified,
5555 * it will be taken from the implementation-dependent maximum
5556 * patch size (gl_MaxPatchVertices)."
5558 * and about TCS outputs:
5560 * "If no size is specified, it will be taken from output patch
5561 * size declared in the shader."
5563 * The GL_OES_geometry_shader spec says:
5565 * "All geometry shader input unsized array declarations will be
5566 * sized by an earlier input primitive layout qualifier, when
5567 * present, as per the following table."
5569 const bool implicitly_sized
=
5570 (var
->data
.mode
== ir_var_shader_in
&&
5571 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5572 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5573 (var
->data
.mode
== ir_var_shader_out
&&
5574 state
->stage
== MESA_SHADER_TESS_CTRL
);
5576 if (t
->is_unsized_array() && !implicitly_sized
)
5577 /* Section 10.17 of the GLSL ES 1.00 specification states that
5578 * unsized array declarations have been removed from the language.
5579 * Arrays that are sized using an initializer are still explicitly
5580 * sized. However, GLSL ES 1.00 does not allow array
5581 * initializers. That is only allowed in GLSL ES 3.00.
5583 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5585 * "An array type can also be formed without specifying a size
5586 * if the definition includes an initializer:
5588 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5589 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5594 _mesa_glsl_error(& loc
, state
,
5595 "unsized array declarations are not allowed in "
5599 /* Section 4.4.6.1 Atomic Counter Layout Qualifiers of the GLSL 4.60 spec:
5601 * "It is a compile-time error to declare an unsized array of
5604 if (var
->type
->is_unsized_array() &&
5605 var
->type
->without_array()->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
5606 _mesa_glsl_error(& loc
, state
,
5607 "Unsized array of atomic_uint is not allowed");
5610 /* If the declaration is not a redeclaration, there are a few additional
5611 * semantic checks that must be applied. In addition, variable that was
5612 * created for the declaration should be added to the IR stream.
5614 if (!is_redeclaration
) {
5615 validate_identifier(decl
->identifier
, loc
, state
);
5617 /* Add the variable to the symbol table. Note that the initializer's
5618 * IR was already processed earlier (though it hasn't been emitted
5619 * yet), without the variable in scope.
5621 * This differs from most C-like languages, but it follows the GLSL
5622 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5625 * "Within a declaration, the scope of a name starts immediately
5626 * after the initializer if present or immediately after the name
5627 * being declared if not."
5629 if (!state
->symbols
->add_variable(var
)) {
5630 YYLTYPE loc
= this->get_location();
5631 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5632 "current scope", decl
->identifier
);
5636 /* Push the variable declaration to the top. It means that all the
5637 * variable declarations will appear in a funny last-to-first order,
5638 * but otherwise we run into trouble if a function is prototyped, a
5639 * global var is decled, then the function is defined with usage of
5640 * the global var. See glslparsertest's CorrectModule.frag.
5642 instructions
->push_head(var
);
5645 instructions
->append_list(&initializer_instructions
);
5649 /* Generally, variable declarations do not have r-values. However,
5650 * one is used for the declaration in
5652 * while (bool b = some_condition()) {
5656 * so we return the rvalue from the last seen declaration here.
5663 ast_parameter_declarator::hir(exec_list
*instructions
,
5664 struct _mesa_glsl_parse_state
*state
)
5667 const struct glsl_type
*type
;
5668 const char *name
= NULL
;
5669 YYLTYPE loc
= this->get_location();
5671 type
= this->type
->glsl_type(& name
, state
);
5675 _mesa_glsl_error(& loc
, state
,
5676 "invalid type `%s' in declaration of `%s'",
5677 name
, this->identifier
);
5679 _mesa_glsl_error(& loc
, state
,
5680 "invalid type in declaration of `%s'",
5684 type
= glsl_type::error_type
;
5687 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5689 * "Functions that accept no input arguments need not use void in the
5690 * argument list because prototypes (or definitions) are required and
5691 * therefore there is no ambiguity when an empty argument list "( )" is
5692 * declared. The idiom "(void)" as a parameter list is provided for
5695 * Placing this check here prevents a void parameter being set up
5696 * for a function, which avoids tripping up checks for main taking
5697 * parameters and lookups of an unnamed symbol.
5699 if (type
->is_void()) {
5700 if (this->identifier
!= NULL
)
5701 _mesa_glsl_error(& loc
, state
,
5702 "named parameter cannot have type `void'");
5708 if (formal_parameter
&& (this->identifier
== NULL
)) {
5709 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5713 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5714 * call already handled the "vec4[..] foo" case.
5716 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5718 if (!type
->is_error() && type
->is_unsized_array()) {
5719 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5721 type
= glsl_type::error_type
;
5725 ir_variable
*var
= new(ctx
)
5726 ir_variable(type
, this->identifier
, ir_var_function_in
);
5728 /* Apply any specified qualifiers to the parameter declaration. Note that
5729 * for function parameters the default mode is 'in'.
5731 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5734 /* From section 4.1.7 of the GLSL 4.40 spec:
5736 * "Opaque variables cannot be treated as l-values; hence cannot
5737 * be used as out or inout function parameters, nor can they be
5740 * From section 4.1.7 of the ARB_bindless_texture spec:
5742 * "Samplers can be used as l-values, so can be assigned into and used
5743 * as "out" and "inout" function parameters."
5745 * From section 4.1.X of the ARB_bindless_texture spec:
5747 * "Images can be used as l-values, so can be assigned into and used as
5748 * "out" and "inout" function parameters."
5750 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5751 && (type
->contains_atomic() ||
5752 (!state
->has_bindless() && type
->contains_opaque()))) {
5753 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5754 "contain %s variables",
5755 state
->has_bindless() ? "atomic" : "opaque");
5756 type
= glsl_type::error_type
;
5759 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5761 * "When calling a function, expressions that do not evaluate to
5762 * l-values cannot be passed to parameters declared as out or inout."
5764 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5766 * "Other binary or unary expressions, non-dereferenced arrays,
5767 * function names, swizzles with repeated fields, and constants
5768 * cannot be l-values."
5770 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5771 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5773 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5775 && !state
->check_version(120, 100, &loc
,
5776 "arrays cannot be out or inout parameters")) {
5777 type
= glsl_type::error_type
;
5780 instructions
->push_tail(var
);
5782 /* Parameter declarations do not have r-values.
5789 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5791 exec_list
*ir_parameters
,
5792 _mesa_glsl_parse_state
*state
)
5794 ast_parameter_declarator
*void_param
= NULL
;
5797 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5798 param
->formal_parameter
= formal
;
5799 param
->hir(ir_parameters
, state
);
5807 if ((void_param
!= NULL
) && (count
> 1)) {
5808 YYLTYPE loc
= void_param
->get_location();
5810 _mesa_glsl_error(& loc
, state
,
5811 "`void' parameter must be only parameter");
5817 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5819 /* IR invariants disallow function declarations or definitions
5820 * nested within other function definitions. But there is no
5821 * requirement about the relative order of function declarations
5822 * and definitions with respect to one another. So simply insert
5823 * the new ir_function block at the end of the toplevel instruction
5826 state
->toplevel_ir
->push_tail(f
);
5831 ast_function::hir(exec_list
*instructions
,
5832 struct _mesa_glsl_parse_state
*state
)
5835 ir_function
*f
= NULL
;
5836 ir_function_signature
*sig
= NULL
;
5837 exec_list hir_parameters
;
5838 YYLTYPE loc
= this->get_location();
5840 const char *const name
= identifier
;
5842 /* New functions are always added to the top-level IR instruction stream,
5843 * so this instruction list pointer is ignored. See also emit_function
5846 (void) instructions
;
5848 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5850 * "Function declarations (prototypes) cannot occur inside of functions;
5851 * they must be at global scope, or for the built-in functions, outside
5852 * the global scope."
5854 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5856 * "User defined functions may only be defined within the global scope."
5858 * Note that this language does not appear in GLSL 1.10.
5860 if ((state
->current_function
!= NULL
) &&
5861 state
->is_version(120, 100)) {
5862 YYLTYPE loc
= this->get_location();
5863 _mesa_glsl_error(&loc
, state
,
5864 "declaration of function `%s' not allowed within "
5865 "function body", name
);
5868 validate_identifier(name
, this->get_location(), state
);
5870 /* Convert the list of function parameters to HIR now so that they can be
5871 * used below to compare this function's signature with previously seen
5872 * signatures for functions with the same name.
5874 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5876 & hir_parameters
, state
);
5878 const char *return_type_name
;
5879 const glsl_type
*return_type
=
5880 this->return_type
->glsl_type(& return_type_name
, state
);
5883 YYLTYPE loc
= this->get_location();
5884 _mesa_glsl_error(&loc
, state
,
5885 "function `%s' has undeclared return type `%s'",
5886 name
, return_type_name
);
5887 return_type
= glsl_type::error_type
;
5890 /* ARB_shader_subroutine states:
5891 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5892 * subroutine(...) to a function declaration."
5894 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
5895 YYLTYPE loc
= this->get_location();
5896 _mesa_glsl_error(&loc
, state
,
5897 "function declaration `%s' cannot have subroutine prepended",
5901 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5902 * "No qualifier is allowed on the return type of a function."
5904 if (this->return_type
->has_qualifiers(state
)) {
5905 YYLTYPE loc
= this->get_location();
5906 _mesa_glsl_error(& loc
, state
,
5907 "function `%s' return type has qualifiers", name
);
5910 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5912 * "Arrays are allowed as arguments and as the return type. In both
5913 * cases, the array must be explicitly sized."
5915 if (return_type
->is_unsized_array()) {
5916 YYLTYPE loc
= this->get_location();
5917 _mesa_glsl_error(& loc
, state
,
5918 "function `%s' return type array must be explicitly "
5922 /* From Section 6.1 (Function Definitions) of the GLSL 1.00 spec:
5924 * "Arrays are allowed as arguments, but not as the return type. [...]
5925 * The return type can also be a structure if the structure does not
5926 * contain an array."
5928 if (state
->language_version
== 100 && return_type
->contains_array()) {
5929 YYLTYPE loc
= this->get_location();
5930 _mesa_glsl_error(& loc
, state
,
5931 "function `%s' return type contains an array", name
);
5934 /* From section 4.1.7 of the GLSL 4.40 spec:
5936 * "[Opaque types] can only be declared as function parameters
5937 * or uniform-qualified variables."
5939 * The ARB_bindless_texture spec doesn't clearly state this, but as it says
5940 * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X,
5941 * (Images)", this should be allowed.
5943 if (return_type
->contains_atomic() ||
5944 (!state
->has_bindless() && return_type
->contains_opaque())) {
5945 YYLTYPE loc
= this->get_location();
5946 _mesa_glsl_error(&loc
, state
,
5947 "function `%s' return type can't contain an %s type",
5948 name
, state
->has_bindless() ? "atomic" : "opaque");
5952 if (return_type
->is_subroutine()) {
5953 YYLTYPE loc
= this->get_location();
5954 _mesa_glsl_error(&loc
, state
,
5955 "function `%s' return type can't be a subroutine type",
5960 /* Create an ir_function if one doesn't already exist. */
5961 f
= state
->symbols
->get_function(name
);
5963 f
= new(ctx
) ir_function(name
);
5964 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
5965 if (!state
->symbols
->add_function(f
)) {
5966 /* This function name shadows a non-function use of the same name. */
5967 YYLTYPE loc
= this->get_location();
5968 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5969 "non-function", name
);
5973 emit_function(state
, f
);
5976 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5978 * "A shader cannot redefine or overload built-in functions."
5980 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5982 * "User code can overload the built-in functions but cannot redefine
5985 if (state
->es_shader
) {
5986 /* Local shader has no exact candidates; check the built-ins. */
5987 _mesa_glsl_initialize_builtin_functions();
5988 if (state
->language_version
>= 300 &&
5989 _mesa_glsl_has_builtin_function(state
, name
)) {
5990 YYLTYPE loc
= this->get_location();
5991 _mesa_glsl_error(& loc
, state
,
5992 "A shader cannot redefine or overload built-in "
5993 "function `%s' in GLSL ES 3.00", name
);
5997 if (state
->language_version
== 100) {
5998 ir_function_signature
*sig
=
5999 _mesa_glsl_find_builtin_function(state
, name
, &hir_parameters
);
6000 if (sig
&& sig
->is_builtin()) {
6001 _mesa_glsl_error(& loc
, state
,
6002 "A shader cannot redefine built-in "
6003 "function `%s' in GLSL ES 1.00", name
);
6008 /* Verify that this function's signature either doesn't match a previously
6009 * seen signature for a function with the same name, or, if a match is found,
6010 * that the previously seen signature does not have an associated definition.
6012 if (state
->es_shader
|| f
->has_user_signature()) {
6013 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
6015 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
6016 if (badvar
!= NULL
) {
6017 YYLTYPE loc
= this->get_location();
6019 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
6020 "qualifiers don't match prototype", name
, badvar
);
6023 if (sig
->return_type
!= return_type
) {
6024 YYLTYPE loc
= this->get_location();
6026 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
6027 "match prototype", name
);
6030 if (sig
->is_defined
) {
6031 if (is_definition
) {
6032 YYLTYPE loc
= this->get_location();
6033 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
6035 /* We just encountered a prototype that exactly matches a
6036 * function that's already been defined. This is redundant,
6037 * and we should ignore it.
6041 } else if (state
->language_version
== 100 && !is_definition
) {
6042 /* From the GLSL 1.00 spec, section 4.2.7:
6044 * "A particular variable, structure or function declaration
6045 * may occur at most once within a scope with the exception
6046 * that a single function prototype plus the corresponding
6047 * function definition are allowed."
6049 YYLTYPE loc
= this->get_location();
6050 _mesa_glsl_error(&loc
, state
, "function `%s' redeclared", name
);
6055 /* Verify the return type of main() */
6056 if (strcmp(name
, "main") == 0) {
6057 if (! return_type
->is_void()) {
6058 YYLTYPE loc
= this->get_location();
6060 _mesa_glsl_error(& loc
, state
, "main() must return void");
6063 if (!hir_parameters
.is_empty()) {
6064 YYLTYPE loc
= this->get_location();
6066 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
6070 /* Finish storing the information about this new function in its signature.
6073 sig
= new(ctx
) ir_function_signature(return_type
);
6074 f
->add_signature(sig
);
6077 sig
->replace_parameters(&hir_parameters
);
6080 if (this->return_type
->qualifier
.subroutine_list
) {
6083 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
6084 unsigned qual_index
;
6085 if (process_qualifier_constant(state
, &loc
, "index",
6086 this->return_type
->qualifier
.index
,
6088 if (!state
->has_explicit_uniform_location()) {
6089 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
6090 "GL_ARB_explicit_uniform_location or "
6092 } else if (qual_index
>= MAX_SUBROUTINES
) {
6093 _mesa_glsl_error(&loc
, state
,
6094 "invalid subroutine index (%d) index must "
6095 "be a number between 0 and "
6096 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
6097 MAX_SUBROUTINES
- 1);
6099 f
->subroutine_index
= qual_index
;
6104 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
6105 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
6106 f
->num_subroutine_types
);
6108 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
6109 const struct glsl_type
*type
;
6110 /* the subroutine type must be already declared */
6111 type
= state
->symbols
->get_type(decl
->identifier
);
6113 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
6116 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
6117 ir_function
*fn
= state
->subroutine_types
[i
];
6118 ir_function_signature
*tsig
= NULL
;
6120 if (strcmp(fn
->name
, decl
->identifier
))
6123 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
6126 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
6128 if (tsig
->return_type
!= sig
->return_type
) {
6129 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
6133 f
->subroutine_types
[idx
++] = type
;
6135 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
6137 state
->num_subroutines
+ 1);
6138 state
->subroutines
[state
->num_subroutines
] = f
;
6139 state
->num_subroutines
++;
6143 if (this->return_type
->qualifier
.is_subroutine_decl()) {
6144 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
6145 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
6148 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
6150 state
->num_subroutine_types
+ 1);
6151 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
6152 state
->num_subroutine_types
++;
6154 f
->is_subroutine
= true;
6157 /* Function declarations (prototypes) do not have r-values.
6164 ast_function_definition::hir(exec_list
*instructions
,
6165 struct _mesa_glsl_parse_state
*state
)
6167 prototype
->is_definition
= true;
6168 prototype
->hir(instructions
, state
);
6170 ir_function_signature
*signature
= prototype
->signature
;
6171 if (signature
== NULL
)
6174 assert(state
->current_function
== NULL
);
6175 state
->current_function
= signature
;
6176 state
->found_return
= false;
6178 /* Duplicate parameters declared in the prototype as concrete variables.
6179 * Add these to the symbol table.
6181 state
->symbols
->push_scope();
6182 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
6183 assert(var
->as_variable() != NULL
);
6185 /* The only way a parameter would "exist" is if two parameters have
6188 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
6189 YYLTYPE loc
= this->get_location();
6191 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
6193 state
->symbols
->add_variable(var
);
6197 /* Convert the body of the function to HIR. */
6198 this->body
->hir(&signature
->body
, state
);
6199 signature
->is_defined
= true;
6201 state
->symbols
->pop_scope();
6203 assert(state
->current_function
== signature
);
6204 state
->current_function
= NULL
;
6206 if (!signature
->return_type
->is_void() && !state
->found_return
) {
6207 YYLTYPE loc
= this->get_location();
6208 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
6209 "%s, but no return statement",
6210 signature
->function_name(),
6211 signature
->return_type
->name
);
6214 /* Function definitions do not have r-values.
6221 ast_jump_statement::hir(exec_list
*instructions
,
6222 struct _mesa_glsl_parse_state
*state
)
6229 assert(state
->current_function
);
6231 if (opt_return_value
) {
6232 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
6234 /* The value of the return type can be NULL if the shader says
6235 * 'return foo();' and foo() is a function that returns void.
6237 * NOTE: The GLSL spec doesn't say that this is an error. The type
6238 * of the return value is void. If the return type of the function is
6239 * also void, then this should compile without error. Seriously.
6241 const glsl_type
*const ret_type
=
6242 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
6244 /* Implicit conversions are not allowed for return values prior to
6245 * ARB_shading_language_420pack.
6247 if (state
->current_function
->return_type
!= ret_type
) {
6248 YYLTYPE loc
= this->get_location();
6250 if (state
->has_420pack()) {
6251 if (!apply_implicit_conversion(state
->current_function
->return_type
,
6253 || (ret
->type
!= state
->current_function
->return_type
)) {
6254 _mesa_glsl_error(& loc
, state
,
6255 "could not implicitly convert return value "
6256 "to %s, in function `%s'",
6257 state
->current_function
->return_type
->name
,
6258 state
->current_function
->function_name());
6261 _mesa_glsl_error(& loc
, state
,
6262 "`return' with wrong type %s, in function `%s' "
6265 state
->current_function
->function_name(),
6266 state
->current_function
->return_type
->name
);
6268 } else if (state
->current_function
->return_type
->base_type
==
6270 YYLTYPE loc
= this->get_location();
6272 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
6273 * specs add a clarification:
6275 * "A void function can only use return without a return argument, even if
6276 * the return argument has void type. Return statements only accept values:
6279 * void func2() { return func1(); } // illegal return statement"
6281 _mesa_glsl_error(& loc
, state
,
6282 "void functions can only use `return' without a "
6286 inst
= new(ctx
) ir_return(ret
);
6288 if (state
->current_function
->return_type
->base_type
!=
6290 YYLTYPE loc
= this->get_location();
6292 _mesa_glsl_error(& loc
, state
,
6293 "`return' with no value, in function %s returning "
6295 state
->current_function
->function_name());
6297 inst
= new(ctx
) ir_return
;
6300 state
->found_return
= true;
6301 instructions
->push_tail(inst
);
6306 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6307 YYLTYPE loc
= this->get_location();
6309 _mesa_glsl_error(& loc
, state
,
6310 "`discard' may only appear in a fragment shader");
6312 instructions
->push_tail(new(ctx
) ir_discard
);
6317 if (mode
== ast_continue
&&
6318 state
->loop_nesting_ast
== NULL
) {
6319 YYLTYPE loc
= this->get_location();
6321 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
6322 } else if (mode
== ast_break
&&
6323 state
->loop_nesting_ast
== NULL
&&
6324 state
->switch_state
.switch_nesting_ast
== NULL
) {
6325 YYLTYPE loc
= this->get_location();
6327 _mesa_glsl_error(& loc
, state
,
6328 "break may only appear in a loop or a switch");
6330 /* For a loop, inline the for loop expression again, since we don't
6331 * know where near the end of the loop body the normal copy of it is
6332 * going to be placed. Same goes for the condition for a do-while
6335 if (state
->loop_nesting_ast
!= NULL
&&
6336 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
6337 if (state
->loop_nesting_ast
->rest_expression
) {
6338 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
6341 if (state
->loop_nesting_ast
->mode
==
6342 ast_iteration_statement::ast_do_while
) {
6343 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
6347 if (state
->switch_state
.is_switch_innermost
&&
6348 mode
== ast_continue
) {
6349 /* Set 'continue_inside' to true. */
6350 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6351 ir_dereference_variable
*deref_continue_inside_var
=
6352 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6353 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6356 /* Break out from the switch, continue for the loop will
6357 * be called right after switch. */
6358 ir_loop_jump
*const jump
=
6359 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6360 instructions
->push_tail(jump
);
6362 } else if (state
->switch_state
.is_switch_innermost
&&
6363 mode
== ast_break
) {
6364 /* Force break out of switch by inserting a break. */
6365 ir_loop_jump
*const jump
=
6366 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6367 instructions
->push_tail(jump
);
6369 ir_loop_jump
*const jump
=
6370 new(ctx
) ir_loop_jump((mode
== ast_break
)
6371 ? ir_loop_jump::jump_break
6372 : ir_loop_jump::jump_continue
);
6373 instructions
->push_tail(jump
);
6380 /* Jump instructions do not have r-values.
6387 ast_selection_statement::hir(exec_list
*instructions
,
6388 struct _mesa_glsl_parse_state
*state
)
6392 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6394 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6396 * "Any expression whose type evaluates to a Boolean can be used as the
6397 * conditional expression bool-expression. Vector types are not accepted
6398 * as the expression to if."
6400 * The checks are separated so that higher quality diagnostics can be
6401 * generated for cases where both rules are violated.
6403 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6404 YYLTYPE loc
= this->condition
->get_location();
6406 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6410 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6412 if (then_statement
!= NULL
) {
6413 state
->symbols
->push_scope();
6414 then_statement
->hir(& stmt
->then_instructions
, state
);
6415 state
->symbols
->pop_scope();
6418 if (else_statement
!= NULL
) {
6419 state
->symbols
->push_scope();
6420 else_statement
->hir(& stmt
->else_instructions
, state
);
6421 state
->symbols
->pop_scope();
6424 instructions
->push_tail(stmt
);
6426 /* if-statements do not have r-values.
6433 /** Value of the case label. */
6436 /** Does this label occur after the default? */
6440 * AST for the case label.
6442 * This is only used to generate error messages for duplicate labels.
6444 ast_expression
*ast
;
6447 /* Used for detection of duplicate case values, compare
6448 * given contents directly.
6451 compare_case_value(const void *a
, const void *b
)
6453 return ((struct case_label
*) a
)->value
== ((struct case_label
*) b
)->value
;
6457 /* Used for detection of duplicate case values, just
6458 * returns key contents as is.
6461 key_contents(const void *key
)
6463 return ((struct case_label
*) key
)->value
;
6468 ast_switch_statement::hir(exec_list
*instructions
,
6469 struct _mesa_glsl_parse_state
*state
)
6473 ir_rvalue
*const test_expression
=
6474 this->test_expression
->hir(instructions
, state
);
6476 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6478 * "The type of init-expression in a switch statement must be a
6481 if (!test_expression
->type
->is_scalar() ||
6482 !test_expression
->type
->is_integer()) {
6483 YYLTYPE loc
= this->test_expression
->get_location();
6485 _mesa_glsl_error(& loc
,
6487 "switch-statement expression must be scalar "
6492 /* Track the switch-statement nesting in a stack-like manner.
6494 struct glsl_switch_state saved
= state
->switch_state
;
6496 state
->switch_state
.is_switch_innermost
= true;
6497 state
->switch_state
.switch_nesting_ast
= this;
6498 state
->switch_state
.labels_ht
=
6499 _mesa_hash_table_create(NULL
, key_contents
,
6500 compare_case_value
);
6501 state
->switch_state
.previous_default
= NULL
;
6503 /* Initalize is_fallthru state to false.
6505 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6506 state
->switch_state
.is_fallthru_var
=
6507 new(ctx
) ir_variable(glsl_type::bool_type
,
6508 "switch_is_fallthru_tmp",
6510 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6512 ir_dereference_variable
*deref_is_fallthru_var
=
6513 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6514 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6517 /* Initialize continue_inside state to false.
6519 state
->switch_state
.continue_inside
=
6520 new(ctx
) ir_variable(glsl_type::bool_type
,
6521 "continue_inside_tmp",
6523 instructions
->push_tail(state
->switch_state
.continue_inside
);
6525 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6526 ir_dereference_variable
*deref_continue_inside_var
=
6527 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6528 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6531 state
->switch_state
.run_default
=
6532 new(ctx
) ir_variable(glsl_type::bool_type
,
6535 instructions
->push_tail(state
->switch_state
.run_default
);
6537 /* Loop around the switch is used for flow control. */
6538 ir_loop
* loop
= new(ctx
) ir_loop();
6539 instructions
->push_tail(loop
);
6541 /* Cache test expression.
6543 test_to_hir(&loop
->body_instructions
, state
);
6545 /* Emit code for body of switch stmt.
6547 body
->hir(&loop
->body_instructions
, state
);
6549 /* Insert a break at the end to exit loop. */
6550 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6551 loop
->body_instructions
.push_tail(jump
);
6553 /* If we are inside loop, check if continue got called inside switch. */
6554 if (state
->loop_nesting_ast
!= NULL
) {
6555 ir_dereference_variable
*deref_continue_inside
=
6556 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6557 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6558 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6560 if (state
->loop_nesting_ast
!= NULL
) {
6561 if (state
->loop_nesting_ast
->rest_expression
) {
6562 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6565 if (state
->loop_nesting_ast
->mode
==
6566 ast_iteration_statement::ast_do_while
) {
6567 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6570 irif
->then_instructions
.push_tail(jump
);
6571 instructions
->push_tail(irif
);
6574 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6576 state
->switch_state
= saved
;
6578 /* Switch statements do not have r-values. */
6584 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6585 struct _mesa_glsl_parse_state
*state
)
6589 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6590 * on the switch test case. The first one would be already raised when
6591 * getting the test_expression at ast_switch_statement::hir
6593 test_expression
->set_is_lhs(true);
6594 /* Cache value of test expression. */
6595 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6597 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6600 ir_dereference_variable
*deref_test_var
=
6601 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6603 instructions
->push_tail(state
->switch_state
.test_var
);
6604 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6609 ast_switch_body::hir(exec_list
*instructions
,
6610 struct _mesa_glsl_parse_state
*state
)
6613 stmts
->hir(instructions
, state
);
6615 /* Switch bodies do not have r-values. */
6620 ast_case_statement_list::hir(exec_list
*instructions
,
6621 struct _mesa_glsl_parse_state
*state
)
6623 exec_list default_case
, after_default
, tmp
;
6625 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6626 case_stmt
->hir(&tmp
, state
);
6629 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6630 default_case
.append_list(&tmp
);
6634 /* If default case found, append 'after_default' list. */
6635 if (!default_case
.is_empty())
6636 after_default
.append_list(&tmp
);
6638 instructions
->append_list(&tmp
);
6641 /* Handle the default case. This is done here because default might not be
6642 * the last case. We need to add checks against following cases first to see
6643 * if default should be chosen or not.
6645 if (!default_case
.is_empty()) {
6646 ir_factory
body(instructions
, state
);
6648 ir_expression
*cmp
= NULL
;
6650 hash_table_foreach(state
->switch_state
.labels_ht
, entry
) {
6651 const struct case_label
*const l
= (struct case_label
*) entry
->data
;
6653 /* If the switch init-value is the value of one of the labels that
6654 * occurs after the default case, disable execution of the default
6657 if (l
->after_default
) {
6658 ir_constant
*const cnst
=
6659 state
->switch_state
.test_var
->type
->base_type
== GLSL_TYPE_UINT
6660 ? body
.constant(unsigned(l
->value
))
6661 : body
.constant(int(l
->value
));
6664 ? equal(cnst
, state
->switch_state
.test_var
)
6665 : logic_or(cmp
, equal(cnst
, state
->switch_state
.test_var
));
6670 body
.emit(assign(state
->switch_state
.run_default
, logic_not(cmp
)));
6672 body
.emit(assign(state
->switch_state
.run_default
, body
.constant(true)));
6674 /* Append default case and all cases after it. */
6675 instructions
->append_list(&default_case
);
6676 instructions
->append_list(&after_default
);
6679 /* Case statements do not have r-values. */
6684 ast_case_statement::hir(exec_list
*instructions
,
6685 struct _mesa_glsl_parse_state
*state
)
6687 labels
->hir(instructions
, state
);
6689 /* Guard case statements depending on fallthru state. */
6690 ir_dereference_variable
*const deref_fallthru_guard
=
6691 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6692 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6694 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6695 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6697 instructions
->push_tail(test_fallthru
);
6699 /* Case statements do not have r-values. */
6705 ast_case_label_list::hir(exec_list
*instructions
,
6706 struct _mesa_glsl_parse_state
*state
)
6708 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6709 label
->hir(instructions
, state
);
6711 /* Case labels do not have r-values. */
6716 ast_case_label::hir(exec_list
*instructions
,
6717 struct _mesa_glsl_parse_state
*state
)
6719 ir_factory
body(instructions
, state
);
6721 ir_variable
*const fallthru_var
= state
->switch_state
.is_fallthru_var
;
6723 /* If not default case, ... */
6724 if (this->test_value
!= NULL
) {
6725 /* Conditionally set fallthru state based on
6726 * comparison of cached test expression value to case label.
6728 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6729 ir_constant
*label_const
=
6730 label_rval
->constant_expression_value(body
.mem_ctx
);
6733 YYLTYPE loc
= this->test_value
->get_location();
6735 _mesa_glsl_error(& loc
, state
,
6736 "switch statement case label must be a "
6737 "constant expression");
6739 /* Stuff a dummy value in to allow processing to continue. */
6740 label_const
= body
.constant(0);
6743 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6744 &label_const
->value
.u
[0]);
6747 const struct case_label
*const l
=
6748 (struct case_label
*) entry
->data
;
6749 const ast_expression
*const previous_label
= l
->ast
;
6750 YYLTYPE loc
= this->test_value
->get_location();
6752 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6754 loc
= previous_label
->get_location();
6755 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6757 struct case_label
*l
= ralloc(state
->switch_state
.labels_ht
,
6760 l
->value
= label_const
->value
.u
[0];
6761 l
->after_default
= state
->switch_state
.previous_default
!= NULL
;
6762 l
->ast
= this->test_value
;
6764 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6765 &label_const
->value
.u
[0],
6770 /* Create an r-value version of the ir_constant label here (after we may
6771 * have created a fake one in error cases) that can be passed to
6772 * apply_implicit_conversion below.
6774 ir_rvalue
*label
= label_const
;
6776 ir_rvalue
*deref_test_var
=
6777 new(body
.mem_ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6780 * From GLSL 4.40 specification section 6.2 ("Selection"):
6782 * "The type of the init-expression value in a switch statement must
6783 * be a scalar int or uint. The type of the constant-expression value
6784 * in a case label also must be a scalar int or uint. When any pair
6785 * of these values is tested for "equal value" and the types do not
6786 * match, an implicit conversion will be done to convert the int to a
6787 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6790 if (label
->type
!= state
->switch_state
.test_var
->type
) {
6791 YYLTYPE loc
= this->test_value
->get_location();
6793 const glsl_type
*type_a
= label
->type
;
6794 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6796 /* Check if int->uint implicit conversion is supported. */
6797 bool integer_conversion_supported
=
6798 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6801 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6802 !integer_conversion_supported
) {
6803 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6804 "init-expression and case label (%s != %s)",
6805 type_a
->name
, type_b
->name
);
6807 /* Conversion of the case label. */
6808 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6809 if (!apply_implicit_conversion(glsl_type::uint_type
,
6811 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6813 /* Conversion of the init-expression value. */
6814 if (!apply_implicit_conversion(glsl_type::uint_type
,
6815 deref_test_var
, state
))
6816 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6820 /* If the implicit conversion was allowed, the types will already be
6821 * the same. If the implicit conversion wasn't allowed, smash the
6822 * type of the label anyway. This will prevent the expression
6823 * constructor (below) from failing an assertion.
6825 label
->type
= deref_test_var
->type
;
6828 body
.emit(assign(fallthru_var
,
6829 logic_or(fallthru_var
, equal(label
, deref_test_var
))));
6830 } else { /* default case */
6831 if (state
->switch_state
.previous_default
) {
6832 YYLTYPE loc
= this->get_location();
6833 _mesa_glsl_error(& loc
, state
,
6834 "multiple default labels in one switch");
6836 loc
= state
->switch_state
.previous_default
->get_location();
6837 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6839 state
->switch_state
.previous_default
= this;
6841 /* Set fallthru condition on 'run_default' bool. */
6842 body
.emit(assign(fallthru_var
,
6843 logic_or(fallthru_var
,
6844 state
->switch_state
.run_default
)));
6847 /* Case statements do not have r-values. */
6852 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6853 struct _mesa_glsl_parse_state
*state
)
6857 if (condition
!= NULL
) {
6858 ir_rvalue
*const cond
=
6859 condition
->hir(instructions
, state
);
6862 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6863 YYLTYPE loc
= condition
->get_location();
6865 _mesa_glsl_error(& loc
, state
,
6866 "loop condition must be scalar boolean");
6868 /* As the first code in the loop body, generate a block that looks
6869 * like 'if (!condition) break;' as the loop termination condition.
6871 ir_rvalue
*const not_cond
=
6872 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6874 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6876 ir_jump
*const break_stmt
=
6877 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6879 if_stmt
->then_instructions
.push_tail(break_stmt
);
6880 instructions
->push_tail(if_stmt
);
6887 ast_iteration_statement::hir(exec_list
*instructions
,
6888 struct _mesa_glsl_parse_state
*state
)
6892 /* For-loops and while-loops start a new scope, but do-while loops do not.
6894 if (mode
!= ast_do_while
)
6895 state
->symbols
->push_scope();
6897 if (init_statement
!= NULL
)
6898 init_statement
->hir(instructions
, state
);
6900 ir_loop
*const stmt
= new(ctx
) ir_loop();
6901 instructions
->push_tail(stmt
);
6903 /* Track the current loop nesting. */
6904 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6906 state
->loop_nesting_ast
= this;
6908 /* Likewise, indicate that following code is closest to a loop,
6909 * NOT closest to a switch.
6911 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6912 state
->switch_state
.is_switch_innermost
= false;
6914 if (mode
!= ast_do_while
)
6915 condition_to_hir(&stmt
->body_instructions
, state
);
6918 body
->hir(& stmt
->body_instructions
, state
);
6920 if (rest_expression
!= NULL
)
6921 rest_expression
->hir(& stmt
->body_instructions
, state
);
6923 if (mode
== ast_do_while
)
6924 condition_to_hir(&stmt
->body_instructions
, state
);
6926 if (mode
!= ast_do_while
)
6927 state
->symbols
->pop_scope();
6929 /* Restore previous nesting before returning. */
6930 state
->loop_nesting_ast
= nesting_ast
;
6931 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6933 /* Loops do not have r-values.
6940 * Determine if the given type is valid for establishing a default precision
6943 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6945 * "The precision statement
6947 * precision precision-qualifier type;
6949 * can be used to establish a default precision qualifier. The type field
6950 * can be either int or float or any of the sampler types, and the
6951 * precision-qualifier can be lowp, mediump, or highp."
6953 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6954 * qualifiers on sampler types, but this seems like an oversight (since the
6955 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6956 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6960 is_valid_default_precision_type(const struct glsl_type
*const type
)
6965 switch (type
->base_type
) {
6967 case GLSL_TYPE_FLOAT
:
6968 /* "int" and "float" are valid, but vectors and matrices are not. */
6969 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6970 case GLSL_TYPE_SAMPLER
:
6971 case GLSL_TYPE_IMAGE
:
6972 case GLSL_TYPE_ATOMIC_UINT
:
6981 ast_type_specifier::hir(exec_list
*instructions
,
6982 struct _mesa_glsl_parse_state
*state
)
6984 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6987 YYLTYPE loc
= this->get_location();
6989 /* If this is a precision statement, check that the type to which it is
6990 * applied is either float or int.
6992 * From section 4.5.3 of the GLSL 1.30 spec:
6993 * "The precision statement
6994 * precision precision-qualifier type;
6995 * can be used to establish a default precision qualifier. The type
6996 * field can be either int or float [...]. Any other types or
6997 * qualifiers will result in an error.
6999 if (this->default_precision
!= ast_precision_none
) {
7000 if (!state
->check_precision_qualifiers_allowed(&loc
))
7003 if (this->structure
!= NULL
) {
7004 _mesa_glsl_error(&loc
, state
,
7005 "precision qualifiers do not apply to structures");
7009 if (this->array_specifier
!= NULL
) {
7010 _mesa_glsl_error(&loc
, state
,
7011 "default precision statements do not apply to "
7016 const struct glsl_type
*const type
=
7017 state
->symbols
->get_type(this->type_name
);
7018 if (!is_valid_default_precision_type(type
)) {
7019 _mesa_glsl_error(&loc
, state
,
7020 "default precision statements apply only to "
7021 "float, int, and opaque types");
7025 if (state
->es_shader
) {
7026 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
7029 * "Non-precision qualified declarations will use the precision
7030 * qualifier specified in the most recent precision statement
7031 * that is still in scope. The precision statement has the same
7032 * scoping rules as variable declarations. If it is declared
7033 * inside a compound statement, its effect stops at the end of
7034 * the innermost statement it was declared in. Precision
7035 * statements in nested scopes override precision statements in
7036 * outer scopes. Multiple precision statements for the same basic
7037 * type can appear inside the same scope, with later statements
7038 * overriding earlier statements within that scope."
7040 * Default precision specifications follow the same scope rules as
7041 * variables. So, we can track the state of the default precision
7042 * qualifiers in the symbol table, and the rules will just work. This
7043 * is a slight abuse of the symbol table, but it has the semantics
7046 state
->symbols
->add_default_precision_qualifier(this->type_name
,
7047 this->default_precision
);
7050 /* FINISHME: Translate precision statements into IR. */
7054 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
7055 * process_record_constructor() can do type-checking on C-style initializer
7056 * expressions of structs, but ast_struct_specifier should only be translated
7057 * to HIR if it is declaring the type of a structure.
7059 * The ->is_declaration field is false for initializers of variables
7060 * declared separately from the struct's type definition.
7062 * struct S { ... }; (is_declaration = true)
7063 * struct T { ... } t = { ... }; (is_declaration = true)
7064 * S s = { ... }; (is_declaration = false)
7066 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
7067 return this->structure
->hir(instructions
, state
);
7074 * Process a structure or interface block tree into an array of structure fields
7076 * After parsing, where there are some syntax differnces, structures and
7077 * interface blocks are almost identical. They are similar enough that the
7078 * AST for each can be processed the same way into a set of
7079 * \c glsl_struct_field to describe the members.
7081 * If we're processing an interface block, var_mode should be the type of the
7082 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
7083 * ir_var_shader_storage). If we're processing a structure, var_mode should be
7087 * The number of fields processed. A pointer to the array structure fields is
7088 * stored in \c *fields_ret.
7091 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
7092 struct _mesa_glsl_parse_state
*state
,
7093 exec_list
*declarations
,
7094 glsl_struct_field
**fields_ret
,
7096 enum glsl_matrix_layout matrix_layout
,
7097 bool allow_reserved_names
,
7098 ir_variable_mode var_mode
,
7099 ast_type_qualifier
*layout
,
7100 unsigned block_stream
,
7101 unsigned block_xfb_buffer
,
7102 unsigned block_xfb_offset
,
7103 unsigned expl_location
,
7104 unsigned expl_align
)
7106 unsigned decl_count
= 0;
7107 unsigned next_offset
= 0;
7109 /* Make an initial pass over the list of fields to determine how
7110 * many there are. Each element in this list is an ast_declarator_list.
7111 * This means that we actually need to count the number of elements in the
7112 * 'declarations' list in each of the elements.
7114 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7115 decl_count
+= decl_list
->declarations
.length();
7118 /* Allocate storage for the fields and process the field
7119 * declarations. As the declarations are processed, try to also convert
7120 * the types to HIR. This ensures that structure definitions embedded in
7121 * other structure definitions or in interface blocks are processed.
7123 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
7126 bool first_member
= true;
7127 bool first_member_has_explicit_location
= false;
7130 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7131 const char *type_name
;
7132 YYLTYPE loc
= decl_list
->get_location();
7134 decl_list
->type
->specifier
->hir(instructions
, state
);
7136 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
7138 * "Anonymous structures are not supported; so embedded structures
7139 * must have a declarator. A name given to an embedded struct is
7140 * scoped at the same level as the struct it is embedded in."
7142 * The same section of the GLSL 1.20 spec says:
7144 * "Anonymous structures are not supported. Embedded structures are
7147 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
7148 * embedded structures in 1.10 only.
7150 if (state
->language_version
!= 110 &&
7151 decl_list
->type
->specifier
->structure
!= NULL
)
7152 _mesa_glsl_error(&loc
, state
,
7153 "embedded structure declarations are not allowed");
7155 const glsl_type
*decl_type
=
7156 decl_list
->type
->glsl_type(& type_name
, state
);
7158 const struct ast_type_qualifier
*const qual
=
7159 &decl_list
->type
->qualifier
;
7161 /* From section 4.3.9 of the GLSL 4.40 spec:
7163 * "[In interface blocks] opaque types are not allowed."
7165 * It should be impossible for decl_type to be NULL here. Cases that
7166 * might naturally lead to decl_type being NULL, especially for the
7167 * is_interface case, will have resulted in compilation having
7168 * already halted due to a syntax error.
7173 /* From section 4.3.7 of the ARB_bindless_texture spec:
7175 * "(remove the following bullet from the last list on p. 39,
7176 * thereby permitting sampler types in interface blocks; image
7177 * types are also permitted in blocks by this extension)"
7179 * * sampler types are not allowed
7181 if (decl_type
->contains_atomic() ||
7182 (!state
->has_bindless() && decl_type
->contains_opaque())) {
7183 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
7184 "interface block contains %s variable",
7185 state
->has_bindless() ? "atomic" : "opaque");
7188 if (decl_type
->contains_atomic()) {
7189 /* From section 4.1.7.3 of the GLSL 4.40 spec:
7191 * "Members of structures cannot be declared as atomic counter
7194 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
7197 if (!state
->has_bindless() && decl_type
->contains_image()) {
7198 /* FINISHME: Same problem as with atomic counters.
7199 * FINISHME: Request clarification from Khronos and add
7200 * FINISHME: spec quotation here.
7202 _mesa_glsl_error(&loc
, state
, "image in structure");
7206 if (qual
->flags
.q
.explicit_binding
) {
7207 _mesa_glsl_error(&loc
, state
,
7208 "binding layout qualifier cannot be applied "
7209 "to struct or interface block members");
7213 if (!first_member
) {
7214 if (!layout
->flags
.q
.explicit_location
&&
7215 ((first_member_has_explicit_location
&&
7216 !qual
->flags
.q
.explicit_location
) ||
7217 (!first_member_has_explicit_location
&&
7218 qual
->flags
.q
.explicit_location
))) {
7219 _mesa_glsl_error(&loc
, state
,
7220 "when block-level location layout qualifier "
7221 "is not supplied either all members must "
7222 "have a location layout qualifier or all "
7223 "members must not have a location layout "
7227 first_member
= false;
7228 first_member_has_explicit_location
=
7229 qual
->flags
.q
.explicit_location
;
7233 if (qual
->flags
.q
.std140
||
7234 qual
->flags
.q
.std430
||
7235 qual
->flags
.q
.packed
||
7236 qual
->flags
.q
.shared
) {
7237 _mesa_glsl_error(&loc
, state
,
7238 "uniform/shader storage block layout qualifiers "
7239 "std140, std430, packed, and shared can only be "
7240 "applied to uniform/shader storage blocks, not "
7244 if (qual
->flags
.q
.constant
) {
7245 _mesa_glsl_error(&loc
, state
,
7246 "const storage qualifier cannot be applied "
7247 "to struct or interface block members");
7250 validate_memory_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7251 validate_image_format_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7253 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
7255 * "A block member may be declared with a stream identifier, but
7256 * the specified stream must match the stream associated with the
7257 * containing block."
7259 if (qual
->flags
.q
.explicit_stream
) {
7260 unsigned qual_stream
;
7261 if (process_qualifier_constant(state
, &loc
, "stream",
7262 qual
->stream
, &qual_stream
) &&
7263 qual_stream
!= block_stream
) {
7264 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
7265 "interface block member does not match "
7266 "the interface block (%u vs %u)", qual_stream
,
7272 unsigned explicit_xfb_buffer
= 0;
7273 if (qual
->flags
.q
.explicit_xfb_buffer
) {
7274 unsigned qual_xfb_buffer
;
7275 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
7276 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
7277 explicit_xfb_buffer
= 1;
7278 if (qual_xfb_buffer
!= block_xfb_buffer
)
7279 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
7280 "interface block member does not match "
7281 "the interface block (%u vs %u)",
7282 qual_xfb_buffer
, block_xfb_buffer
);
7284 xfb_buffer
= (int) qual_xfb_buffer
;
7287 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
7288 xfb_buffer
= (int) block_xfb_buffer
;
7291 int xfb_stride
= -1;
7292 if (qual
->flags
.q
.explicit_xfb_stride
) {
7293 unsigned qual_xfb_stride
;
7294 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
7295 qual
->xfb_stride
, &qual_xfb_stride
)) {
7296 xfb_stride
= (int) qual_xfb_stride
;
7300 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
7301 _mesa_glsl_error(&loc
, state
,
7302 "interpolation qualifiers cannot be used "
7303 "with uniform interface blocks");
7306 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
7307 qual
->has_auxiliary_storage()) {
7308 _mesa_glsl_error(&loc
, state
,
7309 "auxiliary storage qualifiers cannot be used "
7310 "in uniform blocks or structures.");
7313 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
7314 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
7315 _mesa_glsl_error(&loc
, state
,
7316 "row_major and column_major can only be "
7317 "applied to interface blocks");
7319 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
7322 foreach_list_typed (ast_declaration
, decl
, link
,
7323 &decl_list
->declarations
) {
7324 YYLTYPE loc
= decl
->get_location();
7326 if (!allow_reserved_names
)
7327 validate_identifier(decl
->identifier
, loc
, state
);
7329 const struct glsl_type
*field_type
=
7330 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
7331 validate_array_dimensions(field_type
, state
, &loc
);
7332 fields
[i
].type
= field_type
;
7333 fields
[i
].name
= decl
->identifier
;
7334 fields
[i
].interpolation
=
7335 interpret_interpolation_qualifier(qual
, field_type
,
7336 var_mode
, state
, &loc
);
7337 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
7338 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
7339 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
7340 fields
[i
].precision
= qual
->precision
;
7341 fields
[i
].offset
= -1;
7342 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
7343 fields
[i
].xfb_buffer
= xfb_buffer
;
7344 fields
[i
].xfb_stride
= xfb_stride
;
7346 if (qual
->flags
.q
.explicit_location
) {
7347 unsigned qual_location
;
7348 if (process_qualifier_constant(state
, &loc
, "location",
7349 qual
->location
, &qual_location
)) {
7350 fields
[i
].location
= qual_location
+
7351 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
7352 expl_location
= fields
[i
].location
+
7353 fields
[i
].type
->count_attribute_slots(false);
7356 if (layout
&& layout
->flags
.q
.explicit_location
) {
7357 fields
[i
].location
= expl_location
;
7358 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
7360 fields
[i
].location
= -1;
7364 /* Offset can only be used with std430 and std140 layouts an initial
7365 * value of 0 is used for error detection.
7371 if (qual
->flags
.q
.row_major
||
7372 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7378 if(layout
->flags
.q
.std140
) {
7379 align
= field_type
->std140_base_alignment(row_major
);
7380 size
= field_type
->std140_size(row_major
);
7381 } else if (layout
->flags
.q
.std430
) {
7382 align
= field_type
->std430_base_alignment(row_major
);
7383 size
= field_type
->std430_size(row_major
);
7387 if (qual
->flags
.q
.explicit_offset
) {
7388 unsigned qual_offset
;
7389 if (process_qualifier_constant(state
, &loc
, "offset",
7390 qual
->offset
, &qual_offset
)) {
7391 if (align
!= 0 && size
!= 0) {
7392 if (next_offset
> qual_offset
)
7393 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7394 "offset overlaps previous member");
7396 if (qual_offset
% align
) {
7397 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7398 "must be a multiple of the base "
7399 "alignment of %s", field_type
->name
);
7401 fields
[i
].offset
= qual_offset
;
7402 next_offset
= qual_offset
+ size
;
7404 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7405 "with std430 and std140 layouts");
7410 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7411 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7413 if (align
== 0 || size
== 0) {
7414 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7415 "std430 and std140 layouts");
7416 } else if (qual
->flags
.q
.explicit_align
) {
7417 unsigned member_align
;
7418 if (process_qualifier_constant(state
, &loc
, "align",
7419 qual
->align
, &member_align
)) {
7420 if (member_align
== 0 ||
7421 member_align
& (member_align
- 1)) {
7422 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7423 "is not a power of 2");
7425 fields
[i
].offset
= glsl_align(offset
, member_align
);
7426 next_offset
= fields
[i
].offset
+ size
;
7430 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7431 next_offset
= fields
[i
].offset
+ size
;
7433 } else if (!qual
->flags
.q
.explicit_offset
) {
7434 if (align
!= 0 && size
!= 0)
7435 next_offset
= glsl_align(next_offset
, align
) + size
;
7438 /* From the ARB_enhanced_layouts spec:
7440 * "The given offset applies to the first component of the first
7441 * member of the qualified entity. Then, within the qualified
7442 * entity, subsequent components are each assigned, in order, to
7443 * the next available offset aligned to a multiple of that
7444 * component's size. Aggregate types are flattened down to the
7445 * component level to get this sequence of components."
7447 if (qual
->flags
.q
.explicit_xfb_offset
) {
7448 unsigned xfb_offset
;
7449 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7450 qual
->offset
, &xfb_offset
)) {
7451 fields
[i
].offset
= xfb_offset
;
7452 block_xfb_offset
= fields
[i
].offset
+
7453 4 * field_type
->component_slots();
7456 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7457 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7458 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7459 block_xfb_offset
+= 4 * field_type
->component_slots();
7463 /* Propogate row- / column-major information down the fields of the
7464 * structure or interface block. Structures need this data because
7465 * the structure may contain a structure that contains ... a matrix
7466 * that need the proper layout.
7468 if (is_interface
&& layout
&&
7469 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7470 (field_type
->without_array()->is_matrix()
7471 || field_type
->without_array()->is_record())) {
7472 /* If no layout is specified for the field, inherit the layout
7475 fields
[i
].matrix_layout
= matrix_layout
;
7477 if (qual
->flags
.q
.row_major
)
7478 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7479 else if (qual
->flags
.q
.column_major
)
7480 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7482 /* If we're processing an uniform or buffer block, the matrix
7483 * layout must be decided by this point.
7485 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7486 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7489 /* Memory qualifiers are allowed on buffer and image variables, while
7490 * the format qualifier is only accepted for images.
7492 if (var_mode
== ir_var_shader_storage
||
7493 field_type
->without_array()->is_image()) {
7494 /* For readonly and writeonly qualifiers the field definition,
7495 * if set, overwrites the layout qualifier.
7497 if (qual
->flags
.q
.read_only
|| qual
->flags
.q
.write_only
) {
7498 fields
[i
].memory_read_only
= qual
->flags
.q
.read_only
;
7499 fields
[i
].memory_write_only
= qual
->flags
.q
.write_only
;
7501 fields
[i
].memory_read_only
=
7502 layout
? layout
->flags
.q
.read_only
: 0;
7503 fields
[i
].memory_write_only
=
7504 layout
? layout
->flags
.q
.write_only
: 0;
7507 /* For other qualifiers, we set the flag if either the layout
7508 * qualifier or the field qualifier are set
7510 fields
[i
].memory_coherent
= qual
->flags
.q
.coherent
||
7511 (layout
&& layout
->flags
.q
.coherent
);
7512 fields
[i
].memory_volatile
= qual
->flags
.q
._volatile
||
7513 (layout
&& layout
->flags
.q
._volatile
);
7514 fields
[i
].memory_restrict
= qual
->flags
.q
.restrict_flag
||
7515 (layout
&& layout
->flags
.q
.restrict_flag
);
7517 if (field_type
->without_array()->is_image()) {
7518 if (qual
->flags
.q
.explicit_image_format
) {
7519 if (qual
->image_base_type
!=
7520 field_type
->without_array()->sampled_type
) {
7521 _mesa_glsl_error(&loc
, state
, "format qualifier doesn't "
7522 "match the base data type of the image");
7525 fields
[i
].image_format
= qual
->image_format
;
7527 if (!qual
->flags
.q
.write_only
) {
7528 _mesa_glsl_error(&loc
, state
, "image not qualified with "
7529 "`writeonly' must have a format layout "
7533 fields
[i
].image_format
= GL_NONE
;
7542 assert(i
== decl_count
);
7544 *fields_ret
= fields
;
7550 ast_struct_specifier::hir(exec_list
*instructions
,
7551 struct _mesa_glsl_parse_state
*state
)
7553 YYLTYPE loc
= this->get_location();
7555 unsigned expl_location
= 0;
7556 if (layout
&& layout
->flags
.q
.explicit_location
) {
7557 if (!process_qualifier_constant(state
, &loc
, "location",
7558 layout
->location
, &expl_location
)) {
7561 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7565 glsl_struct_field
*fields
;
7566 unsigned decl_count
=
7567 ast_process_struct_or_iface_block_members(instructions
,
7569 &this->declarations
,
7572 GLSL_MATRIX_LAYOUT_INHERITED
,
7573 false /* allow_reserved_names */,
7576 0, /* for interface only */
7577 0, /* for interface only */
7578 0, /* for interface only */
7580 0 /* for interface only */);
7582 validate_identifier(this->name
, loc
, state
);
7584 type
= glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7586 if (!type
->is_anonymous() && !state
->symbols
->add_type(name
, type
)) {
7587 const glsl_type
*match
= state
->symbols
->get_type(name
);
7588 /* allow struct matching for desktop GL - older UE4 does this */
7589 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(type
, false))
7590 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7592 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7594 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7596 state
->num_user_structures
+ 1);
7598 s
[state
->num_user_structures
] = type
;
7599 state
->user_structures
= s
;
7600 state
->num_user_structures
++;
7604 /* Structure type definitions do not have r-values.
7611 * Visitor class which detects whether a given interface block has been used.
7613 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7616 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7617 : mode(mode
), block(block
), found(false)
7621 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7623 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7627 return visit_continue
;
7630 bool usage_found() const
7636 ir_variable_mode mode
;
7637 const glsl_type
*block
;
7642 is_unsized_array_last_element(ir_variable
*v
)
7644 const glsl_type
*interface_type
= v
->get_interface_type();
7645 int length
= interface_type
->length
;
7647 assert(v
->type
->is_unsized_array());
7649 /* Check if it is the last element of the interface */
7650 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7656 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7658 var
->data
.memory_read_only
= field
.memory_read_only
;
7659 var
->data
.memory_write_only
= field
.memory_write_only
;
7660 var
->data
.memory_coherent
= field
.memory_coherent
;
7661 var
->data
.memory_volatile
= field
.memory_volatile
;
7662 var
->data
.memory_restrict
= field
.memory_restrict
;
7666 ast_interface_block::hir(exec_list
*instructions
,
7667 struct _mesa_glsl_parse_state
*state
)
7669 YYLTYPE loc
= this->get_location();
7671 /* Interface blocks must be declared at global scope */
7672 if (state
->current_function
!= NULL
) {
7673 _mesa_glsl_error(&loc
, state
,
7674 "Interface block `%s' must be declared "
7679 /* Validate qualifiers:
7681 * - Layout Qualifiers as per the table in Section 4.4
7682 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7684 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7687 * "Additionally, memory qualifiers may also be used in the declaration
7688 * of shader storage blocks"
7690 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7691 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7692 * Layout Qualifiers) of the GLSL 4.50 spec says:
7694 * "The std430 qualifier is supported only for shader storage blocks;
7695 * using std430 on a uniform block will result in a compile-time error."
7697 ast_type_qualifier allowed_blk_qualifiers
;
7698 allowed_blk_qualifiers
.flags
.i
= 0;
7699 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7700 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7701 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7702 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7703 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7704 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7705 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7706 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7707 if (this->layout
.flags
.q
.buffer
) {
7708 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7709 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7710 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7711 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7712 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7713 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7714 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7716 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7719 /* Interface block */
7720 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7722 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7723 if (this->layout
.flags
.q
.out
) {
7724 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7725 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7726 state
->stage
== MESA_SHADER_TESS_CTRL
||
7727 state
->stage
== MESA_SHADER_TESS_EVAL
||
7728 state
->stage
== MESA_SHADER_VERTEX
) {
7729 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7730 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7731 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7732 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7733 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7734 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7735 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7736 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7738 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7739 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7743 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7744 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7745 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7750 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7751 "invalid qualifier for block",
7754 enum glsl_interface_packing packing
;
7755 if (this->layout
.flags
.q
.std140
) {
7756 packing
= GLSL_INTERFACE_PACKING_STD140
;
7757 } else if (this->layout
.flags
.q
.packed
) {
7758 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7759 } else if (this->layout
.flags
.q
.std430
) {
7760 packing
= GLSL_INTERFACE_PACKING_STD430
;
7762 /* The default layout is shared.
7764 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7767 ir_variable_mode var_mode
;
7768 const char *iface_type_name
;
7769 if (this->layout
.flags
.q
.in
) {
7770 var_mode
= ir_var_shader_in
;
7771 iface_type_name
= "in";
7772 } else if (this->layout
.flags
.q
.out
) {
7773 var_mode
= ir_var_shader_out
;
7774 iface_type_name
= "out";
7775 } else if (this->layout
.flags
.q
.uniform
) {
7776 var_mode
= ir_var_uniform
;
7777 iface_type_name
= "uniform";
7778 } else if (this->layout
.flags
.q
.buffer
) {
7779 var_mode
= ir_var_shader_storage
;
7780 iface_type_name
= "buffer";
7782 var_mode
= ir_var_auto
;
7783 iface_type_name
= "UNKNOWN";
7784 assert(!"interface block layout qualifier not found!");
7787 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7788 if (this->layout
.flags
.q
.row_major
)
7789 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7790 else if (this->layout
.flags
.q
.column_major
)
7791 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7793 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7794 exec_list declared_variables
;
7795 glsl_struct_field
*fields
;
7797 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7798 * that we don't have incompatible qualifiers
7800 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7801 _mesa_glsl_error(&loc
, state
,
7802 "Interface block sets both readonly and writeonly");
7805 unsigned qual_stream
;
7806 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7808 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7809 /* If the stream qualifier is invalid it doesn't make sense to continue
7810 * on and try to compare stream layouts on member variables against it
7811 * so just return early.
7816 unsigned qual_xfb_buffer
;
7817 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7818 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7819 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7823 unsigned qual_xfb_offset
;
7824 if (layout
.flags
.q
.explicit_xfb_offset
) {
7825 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7826 layout
.offset
, &qual_xfb_offset
)) {
7831 unsigned qual_xfb_stride
;
7832 if (layout
.flags
.q
.explicit_xfb_stride
) {
7833 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7834 layout
.xfb_stride
, &qual_xfb_stride
)) {
7839 unsigned expl_location
= 0;
7840 if (layout
.flags
.q
.explicit_location
) {
7841 if (!process_qualifier_constant(state
, &loc
, "location",
7842 layout
.location
, &expl_location
)) {
7845 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7846 : VARYING_SLOT_VAR0
;
7850 unsigned expl_align
= 0;
7851 if (layout
.flags
.q
.explicit_align
) {
7852 if (!process_qualifier_constant(state
, &loc
, "align",
7853 layout
.align
, &expl_align
)) {
7856 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7857 _mesa_glsl_error(&loc
, state
, "align layout qualifier is not a "
7864 unsigned int num_variables
=
7865 ast_process_struct_or_iface_block_members(&declared_variables
,
7867 &this->declarations
,
7871 redeclaring_per_vertex
,
7880 if (!redeclaring_per_vertex
) {
7881 validate_identifier(this->block_name
, loc
, state
);
7883 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7885 * "Block names have no other use within a shader beyond interface
7886 * matching; it is a compile-time error to use a block name at global
7887 * scope for anything other than as a block name."
7889 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7890 if (var
&& !var
->type
->is_interface()) {
7891 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7892 "already used in the scope.",
7897 const glsl_type
*earlier_per_vertex
= NULL
;
7898 if (redeclaring_per_vertex
) {
7899 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7900 * the named interface block gl_in, we can find it by looking at the
7901 * previous declaration of gl_in. Otherwise we can find it by looking
7902 * at the previous decalartion of any of the built-in outputs,
7905 * Also check that the instance name and array-ness of the redeclaration
7909 case ir_var_shader_in
:
7910 if (ir_variable
*earlier_gl_in
=
7911 state
->symbols
->get_variable("gl_in")) {
7912 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7914 _mesa_glsl_error(&loc
, state
,
7915 "redeclaration of gl_PerVertex input not allowed "
7917 _mesa_shader_stage_to_string(state
->stage
));
7919 if (this->instance_name
== NULL
||
7920 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7921 !this->array_specifier
->is_single_dimension()) {
7922 _mesa_glsl_error(&loc
, state
,
7923 "gl_PerVertex input must be redeclared as "
7927 case ir_var_shader_out
:
7928 if (ir_variable
*earlier_gl_Position
=
7929 state
->symbols
->get_variable("gl_Position")) {
7930 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7931 } else if (ir_variable
*earlier_gl_out
=
7932 state
->symbols
->get_variable("gl_out")) {
7933 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7935 _mesa_glsl_error(&loc
, state
,
7936 "redeclaration of gl_PerVertex output not "
7937 "allowed in the %s shader",
7938 _mesa_shader_stage_to_string(state
->stage
));
7940 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7941 if (this->instance_name
== NULL
||
7942 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7943 _mesa_glsl_error(&loc
, state
,
7944 "gl_PerVertex output must be redeclared as "
7948 if (this->instance_name
!= NULL
) {
7949 _mesa_glsl_error(&loc
, state
,
7950 "gl_PerVertex output may not be redeclared with "
7951 "an instance name");
7956 _mesa_glsl_error(&loc
, state
,
7957 "gl_PerVertex must be declared as an input or an "
7962 if (earlier_per_vertex
== NULL
) {
7963 /* An error has already been reported. Bail out to avoid null
7964 * dereferences later in this function.
7969 /* Copy locations from the old gl_PerVertex interface block. */
7970 for (unsigned i
= 0; i
< num_variables
; i
++) {
7971 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7973 _mesa_glsl_error(&loc
, state
,
7974 "redeclaration of gl_PerVertex must be a subset "
7975 "of the built-in members of gl_PerVertex");
7977 fields
[i
].location
=
7978 earlier_per_vertex
->fields
.structure
[j
].location
;
7980 earlier_per_vertex
->fields
.structure
[j
].offset
;
7981 fields
[i
].interpolation
=
7982 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7983 fields
[i
].centroid
=
7984 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7986 earlier_per_vertex
->fields
.structure
[j
].sample
;
7988 earlier_per_vertex
->fields
.structure
[j
].patch
;
7989 fields
[i
].precision
=
7990 earlier_per_vertex
->fields
.structure
[j
].precision
;
7991 fields
[i
].explicit_xfb_buffer
=
7992 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7993 fields
[i
].xfb_buffer
=
7994 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7995 fields
[i
].xfb_stride
=
7996 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
8000 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
8003 * If a built-in interface block is redeclared, it must appear in
8004 * the shader before any use of any member included in the built-in
8005 * declaration, or a compilation error will result.
8007 * This appears to be a clarification to the behaviour established for
8008 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
8009 * regardless of GLSL version.
8011 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
8012 v
.run(instructions
);
8013 if (v
.usage_found()) {
8014 _mesa_glsl_error(&loc
, state
,
8015 "redeclaration of a built-in interface block must "
8016 "appear before any use of any member of the "
8021 const glsl_type
*block_type
=
8022 glsl_type::get_interface_instance(fields
,
8026 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
8029 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
8031 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
8032 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
8035 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
8036 YYLTYPE loc
= this->get_location();
8037 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
8038 "already taken in the current scope",
8039 this->block_name
, iface_type_name
);
8042 /* Since interface blocks cannot contain statements, it should be
8043 * impossible for the block to generate any instructions.
8045 assert(declared_variables
.is_empty());
8047 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
8049 * Geometry shader input variables get the per-vertex values written
8050 * out by vertex shader output variables of the same names. Since a
8051 * geometry shader operates on a set of vertices, each input varying
8052 * variable (or input block, see interface blocks below) needs to be
8053 * declared as an array.
8055 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
8056 var_mode
== ir_var_shader_in
) {
8057 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
8058 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8059 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
8060 !this->layout
.flags
.q
.patch
&&
8061 this->array_specifier
== NULL
&&
8062 var_mode
== ir_var_shader_in
) {
8063 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
8064 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
8065 !this->layout
.flags
.q
.patch
&&
8066 this->array_specifier
== NULL
&&
8067 var_mode
== ir_var_shader_out
) {
8068 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
8072 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
8075 * "If an instance name (instance-name) is used, then it puts all the
8076 * members inside a scope within its own name space, accessed with the
8077 * field selector ( . ) operator (analogously to structures)."
8079 if (this->instance_name
) {
8080 if (redeclaring_per_vertex
) {
8081 /* When a built-in in an unnamed interface block is redeclared,
8082 * get_variable_being_redeclared() calls
8083 * check_builtin_array_max_size() to make sure that built-in array
8084 * variables aren't redeclared to illegal sizes. But we're looking
8085 * at a redeclaration of a named built-in interface block. So we
8086 * have to manually call check_builtin_array_max_size() for all parts
8087 * of the interface that are arrays.
8089 for (unsigned i
= 0; i
< num_variables
; i
++) {
8090 if (fields
[i
].type
->is_array()) {
8091 const unsigned size
= fields
[i
].type
->array_size();
8092 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
8096 validate_identifier(this->instance_name
, loc
, state
);
8101 if (this->array_specifier
!= NULL
) {
8102 const glsl_type
*block_array_type
=
8103 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
8105 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
8107 * For uniform blocks declared an array, each individual array
8108 * element corresponds to a separate buffer object backing one
8109 * instance of the block. As the array size indicates the number
8110 * of buffer objects needed, uniform block array declarations
8111 * must specify an array size.
8113 * And a few paragraphs later:
8115 * Geometry shader input blocks must be declared as arrays and
8116 * follow the array declaration and linking rules for all
8117 * geometry shader inputs. All other input and output block
8118 * arrays must specify an array size.
8120 * The same applies to tessellation shaders.
8122 * The upshot of this is that the only circumstance where an
8123 * interface array size *doesn't* need to be specified is on a
8124 * geometry shader input, tessellation control shader input,
8125 * tessellation control shader output, and tessellation evaluation
8128 if (block_array_type
->is_unsized_array()) {
8129 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
8130 state
->stage
== MESA_SHADER_TESS_CTRL
||
8131 state
->stage
== MESA_SHADER_TESS_EVAL
;
8132 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
8134 if (this->layout
.flags
.q
.in
) {
8136 _mesa_glsl_error(&loc
, state
,
8137 "unsized input block arrays not allowed in "
8139 _mesa_shader_stage_to_string(state
->stage
));
8140 } else if (this->layout
.flags
.q
.out
) {
8142 _mesa_glsl_error(&loc
, state
,
8143 "unsized output block arrays not allowed in "
8145 _mesa_shader_stage_to_string(state
->stage
));
8147 /* by elimination, this is a uniform block array */
8148 _mesa_glsl_error(&loc
, state
,
8149 "unsized uniform block arrays not allowed in "
8151 _mesa_shader_stage_to_string(state
->stage
));
8155 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
8157 * * Arrays of arrays of blocks are not allowed
8159 if (state
->es_shader
&& block_array_type
->is_array() &&
8160 block_array_type
->fields
.array
->is_array()) {
8161 _mesa_glsl_error(&loc
, state
,
8162 "arrays of arrays interface blocks are "
8166 var
= new(state
) ir_variable(block_array_type
,
8167 this->instance_name
,
8170 var
= new(state
) ir_variable(block_type
,
8171 this->instance_name
,
8175 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8176 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8178 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8179 var
->data
.read_only
= true;
8181 var
->data
.patch
= this->layout
.flags
.q
.patch
;
8183 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
8184 handle_geometry_shader_input_decl(state
, loc
, var
);
8185 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8186 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
8187 handle_tess_shader_input_decl(state
, loc
, var
);
8188 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
8189 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
8191 for (unsigned i
= 0; i
< num_variables
; i
++) {
8192 if (var
->data
.mode
== ir_var_shader_storage
)
8193 apply_memory_qualifiers(var
, fields
[i
]);
8196 if (ir_variable
*earlier
=
8197 state
->symbols
->get_variable(this->instance_name
)) {
8198 if (!redeclaring_per_vertex
) {
8199 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
8200 this->instance_name
);
8202 earlier
->data
.how_declared
= ir_var_declared_normally
;
8203 earlier
->type
= var
->type
;
8204 earlier
->reinit_interface_type(block_type
);
8207 if (this->layout
.flags
.q
.explicit_binding
) {
8208 apply_explicit_binding(state
, &loc
, var
, var
->type
,
8212 var
->data
.stream
= qual_stream
;
8213 if (layout
.flags
.q
.explicit_location
) {
8214 var
->data
.location
= expl_location
;
8215 var
->data
.explicit_location
= true;
8218 state
->symbols
->add_variable(var
);
8219 instructions
->push_tail(var
);
8222 /* In order to have an array size, the block must also be declared with
8225 assert(this->array_specifier
== NULL
);
8227 for (unsigned i
= 0; i
< num_variables
; i
++) {
8229 new(state
) ir_variable(fields
[i
].type
,
8230 ralloc_strdup(state
, fields
[i
].name
),
8232 var
->data
.interpolation
= fields
[i
].interpolation
;
8233 var
->data
.centroid
= fields
[i
].centroid
;
8234 var
->data
.sample
= fields
[i
].sample
;
8235 var
->data
.patch
= fields
[i
].patch
;
8236 var
->data
.stream
= qual_stream
;
8237 var
->data
.location
= fields
[i
].location
;
8239 if (fields
[i
].location
!= -1)
8240 var
->data
.explicit_location
= true;
8242 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
8243 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
8245 if (fields
[i
].offset
!= -1)
8246 var
->data
.explicit_xfb_offset
= true;
8247 var
->data
.offset
= fields
[i
].offset
;
8249 var
->init_interface_type(block_type
);
8251 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8252 var
->data
.read_only
= true;
8254 /* Precision qualifiers do not have any meaning in Desktop GLSL */
8255 if (state
->es_shader
) {
8256 var
->data
.precision
=
8257 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
8261 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
8262 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8263 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8265 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
8268 if (var
->data
.mode
== ir_var_shader_storage
)
8269 apply_memory_qualifiers(var
, fields
[i
]);
8271 /* Examine var name here since var may get deleted in the next call */
8272 bool var_is_gl_id
= is_gl_identifier(var
->name
);
8274 if (redeclaring_per_vertex
) {
8275 bool is_redeclaration
;
8277 get_variable_being_redeclared(&var
, loc
, state
,
8278 true /* allow_all_redeclarations */,
8280 if (!var_is_gl_id
|| !is_redeclaration
) {
8281 _mesa_glsl_error(&loc
, state
,
8282 "redeclaration of gl_PerVertex can only "
8283 "include built-in variables");
8284 } else if (var
->data
.how_declared
== ir_var_declared_normally
) {
8285 _mesa_glsl_error(&loc
, state
,
8286 "`%s' has already been redeclared",
8289 var
->data
.how_declared
= ir_var_declared_in_block
;
8290 var
->reinit_interface_type(block_type
);
8295 if (state
->symbols
->get_variable(var
->name
) != NULL
)
8296 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
8298 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
8299 * The UBO declaration itself doesn't get an ir_variable unless it
8300 * has an instance name. This is ugly.
8302 if (this->layout
.flags
.q
.explicit_binding
) {
8303 apply_explicit_binding(state
, &loc
, var
,
8304 var
->get_interface_type(), &this->layout
);
8307 if (var
->type
->is_unsized_array()) {
8308 if (var
->is_in_shader_storage_block() &&
8309 is_unsized_array_last_element(var
)) {
8310 var
->data
.from_ssbo_unsized_array
= true;
8312 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
8314 * "If an array is declared as the last member of a shader storage
8315 * block and the size is not specified at compile-time, it is
8316 * sized at run-time. In all other cases, arrays are sized only
8319 * In desktop GLSL it is allowed to have unsized-arrays that are
8320 * not last, as long as we can determine that they are implicitly
8323 if (state
->es_shader
) {
8324 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
8325 "definition: only last member of a shader "
8326 "storage block can be defined as unsized "
8327 "array", fields
[i
].name
);
8332 state
->symbols
->add_variable(var
);
8333 instructions
->push_tail(var
);
8336 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
8337 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
8339 * It is also a compilation error ... to redeclare a built-in
8340 * block and then use a member from that built-in block that was
8341 * not included in the redeclaration.
8343 * This appears to be a clarification to the behaviour established
8344 * for gl_PerVertex by GLSL 1.50, therefore we implement this
8345 * behaviour regardless of GLSL version.
8347 * To prevent the shader from using a member that was not included in
8348 * the redeclaration, we disable any ir_variables that are still
8349 * associated with the old declaration of gl_PerVertex (since we've
8350 * already updated all of the variables contained in the new
8351 * gl_PerVertex to point to it).
8353 * As a side effect this will prevent
8354 * validate_intrastage_interface_blocks() from getting confused and
8355 * thinking there are conflicting definitions of gl_PerVertex in the
8358 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8359 ir_variable
*const var
= node
->as_variable();
8361 var
->get_interface_type() == earlier_per_vertex
&&
8362 var
->data
.mode
== var_mode
) {
8363 if (var
->data
.how_declared
== ir_var_declared_normally
) {
8364 _mesa_glsl_error(&loc
, state
,
8365 "redeclaration of gl_PerVertex cannot "
8366 "follow a redeclaration of `%s'",
8369 state
->symbols
->disable_variable(var
->name
);
8381 ast_tcs_output_layout::hir(exec_list
*instructions
,
8382 struct _mesa_glsl_parse_state
*state
)
8384 YYLTYPE loc
= this->get_location();
8386 unsigned num_vertices
;
8387 if (!state
->out_qualifier
->vertices
->
8388 process_qualifier_constant(state
, "vertices", &num_vertices
,
8390 /* return here to stop cascading incorrect error messages */
8394 /* If any shader outputs occurred before this declaration and specified an
8395 * array size, make sure the size they specified is consistent with the
8398 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8399 _mesa_glsl_error(&loc
, state
,
8400 "this tessellation control shader output layout "
8401 "specifies %u vertices, but a previous output "
8402 "is declared with size %u",
8403 num_vertices
, state
->tcs_output_size
);
8407 state
->tcs_output_vertices_specified
= true;
8409 /* If any shader outputs occurred before this declaration and did not
8410 * specify an array size, their size is determined now.
8412 foreach_in_list (ir_instruction
, node
, instructions
) {
8413 ir_variable
*var
= node
->as_variable();
8414 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8417 /* Note: Not all tessellation control shader output are arrays. */
8418 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8421 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8422 _mesa_glsl_error(&loc
, state
,
8423 "this tessellation control shader output layout "
8424 "specifies %u vertices, but an access to element "
8425 "%u of output `%s' already exists", num_vertices
,
8426 var
->data
.max_array_access
, var
->name
);
8428 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8438 ast_gs_input_layout::hir(exec_list
*instructions
,
8439 struct _mesa_glsl_parse_state
*state
)
8441 YYLTYPE loc
= this->get_location();
8443 /* Should have been prevented by the parser. */
8444 assert(!state
->gs_input_prim_type_specified
8445 || state
->in_qualifier
->prim_type
== this->prim_type
);
8447 /* If any shader inputs occurred before this declaration and specified an
8448 * array size, make sure the size they specified is consistent with the
8451 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8452 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8453 _mesa_glsl_error(&loc
, state
,
8454 "this geometry shader input layout implies %u vertices"
8455 " per primitive, but a previous input is declared"
8456 " with size %u", num_vertices
, state
->gs_input_size
);
8460 state
->gs_input_prim_type_specified
= true;
8462 /* If any shader inputs occurred before this declaration and did not
8463 * specify an array size, their size is determined now.
8465 foreach_in_list(ir_instruction
, node
, instructions
) {
8466 ir_variable
*var
= node
->as_variable();
8467 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8470 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8474 if (var
->type
->is_unsized_array()) {
8475 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8476 _mesa_glsl_error(&loc
, state
,
8477 "this geometry shader input layout implies %u"
8478 " vertices, but an access to element %u of input"
8479 " `%s' already exists", num_vertices
,
8480 var
->data
.max_array_access
, var
->name
);
8482 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8493 ast_cs_input_layout::hir(exec_list
*instructions
,
8494 struct _mesa_glsl_parse_state
*state
)
8496 YYLTYPE loc
= this->get_location();
8498 /* From the ARB_compute_shader specification:
8500 * If the local size of the shader in any dimension is greater
8501 * than the maximum size supported by the implementation for that
8502 * dimension, a compile-time error results.
8504 * It is not clear from the spec how the error should be reported if
8505 * the total size of the work group exceeds
8506 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8507 * report it at compile time as well.
8509 GLuint64 total_invocations
= 1;
8510 unsigned qual_local_size
[3];
8511 for (int i
= 0; i
< 3; i
++) {
8513 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8515 /* Infer a local_size of 1 for unspecified dimensions */
8516 if (this->local_size
[i
] == NULL
) {
8517 qual_local_size
[i
] = 1;
8518 } else if (!this->local_size
[i
]->
8519 process_qualifier_constant(state
, local_size_str
,
8520 &qual_local_size
[i
], false)) {
8521 ralloc_free(local_size_str
);
8524 ralloc_free(local_size_str
);
8526 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8527 _mesa_glsl_error(&loc
, state
,
8528 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8530 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8533 total_invocations
*= qual_local_size
[i
];
8534 if (total_invocations
>
8535 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8536 _mesa_glsl_error(&loc
, state
,
8537 "product of local_sizes exceeds "
8538 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8539 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8544 /* If any compute input layout declaration preceded this one, make sure it
8545 * was consistent with this one.
8547 if (state
->cs_input_local_size_specified
) {
8548 for (int i
= 0; i
< 3; i
++) {
8549 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8550 _mesa_glsl_error(&loc
, state
,
8551 "compute shader input layout does not match"
8552 " previous declaration");
8558 /* The ARB_compute_variable_group_size spec says:
8560 * If a compute shader including a *local_size_variable* qualifier also
8561 * declares a fixed local group size using the *local_size_x*,
8562 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8565 if (state
->cs_input_local_size_variable_specified
) {
8566 _mesa_glsl_error(&loc
, state
,
8567 "compute shader can't include both a variable and a "
8568 "fixed local group size");
8572 state
->cs_input_local_size_specified
= true;
8573 for (int i
= 0; i
< 3; i
++)
8574 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8576 /* We may now declare the built-in constant gl_WorkGroupSize (see
8577 * builtin_variable_generator::generate_constants() for why we didn't
8578 * declare it earlier).
8580 ir_variable
*var
= new(state
->symbols
)
8581 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8582 var
->data
.how_declared
= ir_var_declared_implicitly
;
8583 var
->data
.read_only
= true;
8584 instructions
->push_tail(var
);
8585 state
->symbols
->add_variable(var
);
8586 ir_constant_data data
;
8587 memset(&data
, 0, sizeof(data
));
8588 for (int i
= 0; i
< 3; i
++)
8589 data
.u
[i
] = qual_local_size
[i
];
8590 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8591 var
->constant_initializer
=
8592 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8593 var
->data
.has_initializer
= true;
8600 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8601 exec_list
*instructions
)
8603 bool gl_FragColor_assigned
= false;
8604 bool gl_FragData_assigned
= false;
8605 bool gl_FragSecondaryColor_assigned
= false;
8606 bool gl_FragSecondaryData_assigned
= false;
8607 bool user_defined_fs_output_assigned
= false;
8608 ir_variable
*user_defined_fs_output
= NULL
;
8610 /* It would be nice to have proper location information. */
8612 memset(&loc
, 0, sizeof(loc
));
8614 foreach_in_list(ir_instruction
, node
, instructions
) {
8615 ir_variable
*var
= node
->as_variable();
8617 if (!var
|| !var
->data
.assigned
)
8620 if (strcmp(var
->name
, "gl_FragColor") == 0)
8621 gl_FragColor_assigned
= true;
8622 else if (strcmp(var
->name
, "gl_FragData") == 0)
8623 gl_FragData_assigned
= true;
8624 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8625 gl_FragSecondaryColor_assigned
= true;
8626 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8627 gl_FragSecondaryData_assigned
= true;
8628 else if (!is_gl_identifier(var
->name
)) {
8629 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8630 var
->data
.mode
== ir_var_shader_out
) {
8631 user_defined_fs_output_assigned
= true;
8632 user_defined_fs_output
= var
;
8637 /* From the GLSL 1.30 spec:
8639 * "If a shader statically assigns a value to gl_FragColor, it
8640 * may not assign a value to any element of gl_FragData. If a
8641 * shader statically writes a value to any element of
8642 * gl_FragData, it may not assign a value to
8643 * gl_FragColor. That is, a shader may assign values to either
8644 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8645 * linked together must also consistently write just one of
8646 * these variables. Similarly, if user declared output
8647 * variables are in use (statically assigned to), then the
8648 * built-in variables gl_FragColor and gl_FragData may not be
8649 * assigned to. These incorrect usages all generate compile
8652 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8653 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8654 "`gl_FragColor' and `gl_FragData'");
8655 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8656 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8657 "`gl_FragColor' and `%s'",
8658 user_defined_fs_output
->name
);
8659 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8660 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8661 "`gl_FragSecondaryColorEXT' and"
8662 " `gl_FragSecondaryDataEXT'");
8663 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8664 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8665 "`gl_FragColor' and"
8666 " `gl_FragSecondaryDataEXT'");
8667 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8668 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8670 " `gl_FragSecondaryColorEXT'");
8671 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8672 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8673 "`gl_FragData' and `%s'",
8674 user_defined_fs_output
->name
);
8677 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8678 !state
->EXT_blend_func_extended_enable
) {
8679 _mesa_glsl_error(&loc
, state
,
8680 "Dual source blending requires EXT_blend_func_extended");
8685 verify_subroutine_associated_funcs(struct _mesa_glsl_parse_state
*state
)
8688 memset(&loc
, 0, sizeof(loc
));
8690 /* Section 6.1.2 (Subroutines) of the GLSL 4.00 spec says:
8692 * "A program will fail to compile or link if any shader
8693 * or stage contains two or more functions with the same
8694 * name if the name is associated with a subroutine type."
8697 for (int i
= 0; i
< state
->num_subroutines
; i
++) {
8698 unsigned definitions
= 0;
8699 ir_function
*fn
= state
->subroutines
[i
];
8700 /* Calculate number of function definitions with the same name */
8701 foreach_in_list(ir_function_signature
, sig
, &fn
->signatures
) {
8702 if (sig
->is_defined
) {
8703 if (++definitions
> 1) {
8704 _mesa_glsl_error(&loc
, state
,
8705 "%s shader contains two or more function "
8706 "definitions with name `%s', which is "
8707 "associated with a subroutine type.\n",
8708 _mesa_shader_stage_to_string(state
->stage
),
8718 remove_per_vertex_blocks(exec_list
*instructions
,
8719 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8721 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8722 * if it exists in this shader type.
8724 const glsl_type
*per_vertex
= NULL
;
8726 case ir_var_shader_in
:
8727 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8728 per_vertex
= gl_in
->get_interface_type();
8730 case ir_var_shader_out
:
8731 if (ir_variable
*gl_Position
=
8732 state
->symbols
->get_variable("gl_Position")) {
8733 per_vertex
= gl_Position
->get_interface_type();
8737 assert(!"Unexpected mode");
8741 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8742 * need to do anything.
8744 if (per_vertex
== NULL
)
8747 /* If the interface block is used by the shader, then we don't need to do
8750 interface_block_usage_visitor
v(mode
, per_vertex
);
8751 v
.run(instructions
);
8752 if (v
.usage_found())
8755 /* Remove any ir_variable declarations that refer to the interface block
8758 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8759 ir_variable
*const var
= node
->as_variable();
8760 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8761 var
->data
.mode
== mode
) {
8762 state
->symbols
->disable_variable(var
->name
);
8769 ast_warnings_toggle::hir(exec_list
*,
8770 struct _mesa_glsl_parse_state
*state
)
8772 state
->warnings_enabled
= enable
;