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 "program/hash_table.h"
57 #include "main/shaderobj.h"
59 #include "ir_builder.h"
61 using namespace ir_builder
;
64 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
65 exec_list
*instructions
);
67 remove_per_vertex_blocks(exec_list
*instructions
,
68 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
71 * Visitor class that finds the first instance of any write-only variable that
72 * is ever read, if any
74 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
77 read_from_write_only_variable_visitor() : found(NULL
)
81 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
83 if (this->in_assignee
)
84 return visit_continue
;
86 ir_variable
*var
= ir
->variable_referenced();
87 /* We can have image_write_only set on both images and buffer variables,
88 * but in the former there is a distinction between reads from
89 * the variable itself (write_only) and from the memory they point to
90 * (image_write_only), while in the case of buffer variables there is
91 * no such distinction, that is why this check here is limited to
92 * buffer variables alone.
94 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
95 return visit_continue
;
97 if (var
->data
.image_write_only
) {
102 return visit_continue
;
105 ir_variable
*get_variable() {
109 virtual ir_visitor_status
visit_enter(ir_expression
*ir
)
111 /* .length() doesn't actually read anything */
112 if (ir
->operation
== ir_unop_ssbo_unsized_array_length
)
113 return visit_continue_with_parent
;
115 return visit_continue
;
123 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
125 _mesa_glsl_initialize_variables(instructions
, state
);
127 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
129 state
->current_function
= NULL
;
131 state
->toplevel_ir
= instructions
;
133 state
->gs_input_prim_type_specified
= false;
134 state
->tcs_output_vertices_specified
= false;
135 state
->cs_input_local_size_specified
= false;
137 /* Section 4.2 of the GLSL 1.20 specification states:
138 * "The built-in functions are scoped in a scope outside the global scope
139 * users declare global variables in. That is, a shader's global scope,
140 * available for user-defined functions and global variables, is nested
141 * inside the scope containing the built-in functions."
143 * Since built-in functions like ftransform() access built-in variables,
144 * it follows that those must be in the outer scope as well.
146 * We push scope here to create this nesting effect...but don't pop.
147 * This way, a shader's globals are still in the symbol table for use
150 state
->symbols
->push_scope();
152 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
153 ast
->hir(instructions
, state
);
155 detect_recursion_unlinked(state
, instructions
);
156 detect_conflicting_assignments(state
, instructions
);
158 state
->toplevel_ir
= NULL
;
160 /* Move all of the variable declarations to the front of the IR list, and
161 * reverse the order. This has the (intended!) side effect that vertex
162 * shader inputs and fragment shader outputs will appear in the IR in the
163 * same order that they appeared in the shader code. This results in the
164 * locations being assigned in the declared order. Many (arguably buggy)
165 * applications depend on this behavior, and it matches what nearly all
168 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
169 ir_variable
*const var
= node
->as_variable();
175 instructions
->push_head(var
);
178 /* Figure out if gl_FragCoord is actually used in fragment shader */
179 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
181 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
183 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
185 * If multiple shaders using members of a built-in block belonging to
186 * the same interface are linked together in the same program, they
187 * must all redeclare the built-in block in the same way, as described
188 * in section 4.3.7 "Interface Blocks" for interface block matching, or
189 * a link error will result.
191 * The phrase "using members of a built-in block" implies that if two
192 * shaders are linked together and one of them *does not use* any members
193 * of the built-in block, then that shader does not need to have a matching
194 * redeclaration of the built-in block.
196 * This appears to be a clarification to the behaviour established for
197 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
200 * The definition of "interface" in section 4.3.7 that applies here is as
203 * The boundary between adjacent programmable pipeline stages: This
204 * spans all the outputs in all compilation units of the first stage
205 * and all the inputs in all compilation units of the second stage.
207 * Therefore this rule applies to both inter- and intra-stage linking.
209 * The easiest way to implement this is to check whether the shader uses
210 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
211 * remove all the relevant variable declaration from the IR, so that the
212 * linker won't see them and complain about mismatches.
214 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
215 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
217 /* Check that we don't have reads from write-only variables */
218 read_from_write_only_variable_visitor v
;
220 ir_variable
*error_var
= v
.get_variable();
222 /* It would be nice to have proper location information, but for that
223 * we would need to check this as we process each kind of AST node
226 memset(&loc
, 0, sizeof(loc
));
227 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
233 static ir_expression_operation
234 get_implicit_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
235 struct _mesa_glsl_parse_state
*state
)
237 switch (to
->base_type
) {
238 case GLSL_TYPE_FLOAT
:
239 switch (from
->base_type
) {
240 case GLSL_TYPE_INT
: return ir_unop_i2f
;
241 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
242 default: return (ir_expression_operation
)0;
246 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
)
247 return (ir_expression_operation
)0;
248 switch (from
->base_type
) {
249 case GLSL_TYPE_INT
: return ir_unop_i2u
;
250 default: return (ir_expression_operation
)0;
253 case GLSL_TYPE_DOUBLE
:
254 if (!state
->has_double())
255 return (ir_expression_operation
)0;
256 switch (from
->base_type
) {
257 case GLSL_TYPE_INT
: return ir_unop_i2d
;
258 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
259 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
260 default: return (ir_expression_operation
)0;
263 default: return (ir_expression_operation
)0;
269 * If a conversion is available, convert one operand to a different type
271 * The \c from \c ir_rvalue is converted "in place".
273 * \param to Type that the operand it to be converted to
274 * \param from Operand that is being converted
275 * \param state GLSL compiler state
278 * If a conversion is possible (or unnecessary), \c true is returned.
279 * Otherwise \c false is returned.
282 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
283 struct _mesa_glsl_parse_state
*state
)
286 if (to
->base_type
== from
->type
->base_type
)
289 /* Prior to GLSL 1.20, there are no implicit conversions */
290 if (!state
->is_version(120, 0))
293 /* ESSL does not allow implicit conversions */
294 if (state
->es_shader
)
297 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
299 * "There are no implicit array or structure conversions. For
300 * example, an array of int cannot be implicitly converted to an
303 if (!to
->is_numeric() || !from
->type
->is_numeric())
306 /* We don't actually want the specific type `to`, we want a type
307 * with the same base type as `to`, but the same vector width as
310 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
311 from
->type
->matrix_columns
);
313 ir_expression_operation op
= get_implicit_conversion_operation(to
, from
->type
, state
);
315 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
323 static const struct glsl_type
*
324 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
326 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
328 const glsl_type
*type_a
= value_a
->type
;
329 const glsl_type
*type_b
= value_b
->type
;
331 /* From GLSL 1.50 spec, page 56:
333 * "The arithmetic binary operators add (+), subtract (-),
334 * multiply (*), and divide (/) operate on integer and
335 * floating-point scalars, vectors, and matrices."
337 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
338 _mesa_glsl_error(loc
, state
,
339 "operands to arithmetic operators must be numeric");
340 return glsl_type::error_type
;
344 /* "If one operand is floating-point based and the other is
345 * not, then the conversions from Section 4.1.10 "Implicit
346 * Conversions" are applied to the non-floating-point-based operand."
348 if (!apply_implicit_conversion(type_a
, value_b
, state
)
349 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
350 _mesa_glsl_error(loc
, state
,
351 "could not implicitly convert operands to "
352 "arithmetic operator");
353 return glsl_type::error_type
;
355 type_a
= value_a
->type
;
356 type_b
= value_b
->type
;
358 /* "If the operands are integer types, they must both be signed or
361 * From this rule and the preceeding conversion it can be inferred that
362 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
363 * The is_numeric check above already filtered out the case where either
364 * type is not one of these, so now the base types need only be tested for
367 if (type_a
->base_type
!= type_b
->base_type
) {
368 _mesa_glsl_error(loc
, state
,
369 "base type mismatch for arithmetic operator");
370 return glsl_type::error_type
;
373 /* "All arithmetic binary operators result in the same fundamental type
374 * (signed integer, unsigned integer, or floating-point) as the
375 * operands they operate on, after operand type conversion. After
376 * conversion, the following cases are valid
378 * * The two operands are scalars. In this case the operation is
379 * applied, resulting in a scalar."
381 if (type_a
->is_scalar() && type_b
->is_scalar())
384 /* "* One operand is a scalar, and the other is a vector or matrix.
385 * In this case, the scalar operation is applied independently to each
386 * component of the vector or matrix, resulting in the same size
389 if (type_a
->is_scalar()) {
390 if (!type_b
->is_scalar())
392 } else if (type_b
->is_scalar()) {
396 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
397 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
400 assert(!type_a
->is_scalar());
401 assert(!type_b
->is_scalar());
403 /* "* The two operands are vectors of the same size. In this case, the
404 * operation is done component-wise resulting in the same size
407 if (type_a
->is_vector() && type_b
->is_vector()) {
408 if (type_a
== type_b
) {
411 _mesa_glsl_error(loc
, state
,
412 "vector size mismatch for arithmetic operator");
413 return glsl_type::error_type
;
417 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
418 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
419 * <vector, vector> have been handled. At least one of the operands must
420 * be matrix. Further, since there are no integer matrix types, the base
421 * type of both operands must be float.
423 assert(type_a
->is_matrix() || type_b
->is_matrix());
424 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
425 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
426 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
427 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
429 /* "* The operator is add (+), subtract (-), or divide (/), and the
430 * operands are matrices with the same number of rows and the same
431 * number of columns. In this case, the operation is done component-
432 * wise resulting in the same size matrix."
433 * * The operator is multiply (*), where both operands are matrices or
434 * one operand is a vector and the other a matrix. A right vector
435 * operand is treated as a column vector and a left vector operand as a
436 * row vector. In all these cases, it is required that the number of
437 * columns of the left operand is equal to the number of rows of the
438 * right operand. Then, the multiply (*) operation does a linear
439 * algebraic multiply, yielding an object that has the same number of
440 * rows as the left operand and the same number of columns as the right
441 * operand. Section 5.10 "Vector and Matrix Operations" explains in
442 * more detail how vectors and matrices are operated on."
445 if (type_a
== type_b
)
448 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
450 if (type
== glsl_type::error_type
) {
451 _mesa_glsl_error(loc
, state
,
452 "size mismatch for matrix multiplication");
459 /* "All other cases are illegal."
461 _mesa_glsl_error(loc
, state
, "type mismatch");
462 return glsl_type::error_type
;
466 static const struct glsl_type
*
467 unary_arithmetic_result_type(const struct glsl_type
*type
,
468 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
470 /* From GLSL 1.50 spec, page 57:
472 * "The arithmetic unary operators negate (-), post- and pre-increment
473 * and decrement (-- and ++) operate on integer or floating-point
474 * values (including vectors and matrices). All unary operators work
475 * component-wise on their operands. These result with the same type
478 if (!type
->is_numeric()) {
479 _mesa_glsl_error(loc
, state
,
480 "operands to arithmetic operators must be numeric");
481 return glsl_type::error_type
;
488 * \brief Return the result type of a bit-logic operation.
490 * If the given types to the bit-logic operator are invalid, return
491 * glsl_type::error_type.
493 * \param value_a LHS of bit-logic op
494 * \param value_b RHS of bit-logic op
496 static const struct glsl_type
*
497 bit_logic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
499 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
501 const glsl_type
*type_a
= value_a
->type
;
502 const glsl_type
*type_b
= value_b
->type
;
504 if (!state
->check_bitwise_operations_allowed(loc
)) {
505 return glsl_type::error_type
;
508 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
510 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
511 * (|). The operands must be of type signed or unsigned integers or
514 if (!type_a
->is_integer()) {
515 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
516 ast_expression::operator_string(op
));
517 return glsl_type::error_type
;
519 if (!type_b
->is_integer()) {
520 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
521 ast_expression::operator_string(op
));
522 return glsl_type::error_type
;
525 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
526 * make sense for bitwise operations, as they don't operate on floats.
528 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
529 * here. It wasn't clear whether or not we should apply them to bitwise
530 * operations. However, Khronos has decided that they should in future
531 * language revisions. Applications also rely on this behavior. We opt
532 * to apply them in general, but issue a portability warning.
534 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
536 if (type_a
->base_type
!= type_b
->base_type
) {
537 if (!apply_implicit_conversion(type_a
, value_b
, state
)
538 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
539 _mesa_glsl_error(loc
, state
,
540 "could not implicitly convert operands to "
542 ast_expression::operator_string(op
));
543 return glsl_type::error_type
;
545 _mesa_glsl_warning(loc
, state
,
546 "some implementations may not support implicit "
547 "int -> uint conversions for `%s' operators; "
548 "consider casting explicitly for portability",
549 ast_expression::operator_string(op
));
551 type_a
= value_a
->type
;
552 type_b
= value_b
->type
;
555 /* "The fundamental types of the operands (signed or unsigned) must
558 if (type_a
->base_type
!= type_b
->base_type
) {
559 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
560 "base type", ast_expression::operator_string(op
));
561 return glsl_type::error_type
;
564 /* "The operands cannot be vectors of differing size." */
565 if (type_a
->is_vector() &&
566 type_b
->is_vector() &&
567 type_a
->vector_elements
!= type_b
->vector_elements
) {
568 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
569 "different sizes", ast_expression::operator_string(op
));
570 return glsl_type::error_type
;
573 /* "If one operand is a scalar and the other a vector, the scalar is
574 * applied component-wise to the vector, resulting in the same type as
575 * the vector. The fundamental types of the operands [...] will be the
576 * resulting fundamental type."
578 if (type_a
->is_scalar())
584 static const struct glsl_type
*
585 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
586 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
588 const glsl_type
*type_a
= value_a
->type
;
589 const glsl_type
*type_b
= value_b
->type
;
591 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
592 return glsl_type::error_type
;
595 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
597 * "The operator modulus (%) operates on signed or unsigned integers or
600 if (!type_a
->is_integer()) {
601 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
602 return glsl_type::error_type
;
604 if (!type_b
->is_integer()) {
605 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
606 return glsl_type::error_type
;
609 /* "If the fundamental types in the operands do not match, then the
610 * conversions from section 4.1.10 "Implicit Conversions" are applied
611 * to create matching types."
613 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
614 * int -> uint conversion rules. Prior to that, there were no implicit
615 * conversions. So it's harmless to apply them universally - no implicit
616 * conversions will exist. If the types don't match, we'll receive false,
617 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
619 * "The operand types must both be signed or unsigned."
621 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
622 !apply_implicit_conversion(type_b
, value_a
, state
)) {
623 _mesa_glsl_error(loc
, state
,
624 "could not implicitly convert operands to "
625 "modulus (%%) operator");
626 return glsl_type::error_type
;
628 type_a
= value_a
->type
;
629 type_b
= value_b
->type
;
631 /* "The operands cannot be vectors of differing size. If one operand is
632 * a scalar and the other vector, then the scalar is applied component-
633 * wise to the vector, resulting in the same type as the vector. If both
634 * are vectors of the same size, the result is computed component-wise."
636 if (type_a
->is_vector()) {
637 if (!type_b
->is_vector()
638 || (type_a
->vector_elements
== type_b
->vector_elements
))
643 /* "The operator modulus (%) is not defined for any other data types
644 * (non-integer types)."
646 _mesa_glsl_error(loc
, state
, "type mismatch");
647 return glsl_type::error_type
;
651 static const struct glsl_type
*
652 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
653 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
655 const glsl_type
*type_a
= value_a
->type
;
656 const glsl_type
*type_b
= value_b
->type
;
658 /* From GLSL 1.50 spec, page 56:
659 * "The relational operators greater than (>), less than (<), greater
660 * than or equal (>=), and less than or equal (<=) operate only on
661 * scalar integer and scalar floating-point expressions."
663 if (!type_a
->is_numeric()
664 || !type_b
->is_numeric()
665 || !type_a
->is_scalar()
666 || !type_b
->is_scalar()) {
667 _mesa_glsl_error(loc
, state
,
668 "operands to relational operators must be scalar and "
670 return glsl_type::error_type
;
673 /* "Either the operands' types must match, or the conversions from
674 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
675 * operand, after which the types must match."
677 if (!apply_implicit_conversion(type_a
, value_b
, state
)
678 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
679 _mesa_glsl_error(loc
, state
,
680 "could not implicitly convert operands to "
681 "relational operator");
682 return glsl_type::error_type
;
684 type_a
= value_a
->type
;
685 type_b
= value_b
->type
;
687 if (type_a
->base_type
!= type_b
->base_type
) {
688 _mesa_glsl_error(loc
, state
, "base type mismatch");
689 return glsl_type::error_type
;
692 /* "The result is scalar Boolean."
694 return glsl_type::bool_type
;
698 * \brief Return the result type of a bit-shift operation.
700 * If the given types to the bit-shift operator are invalid, return
701 * glsl_type::error_type.
703 * \param type_a Type of LHS of bit-shift op
704 * \param type_b Type of RHS of bit-shift op
706 static const struct glsl_type
*
707 shift_result_type(const struct glsl_type
*type_a
,
708 const struct glsl_type
*type_b
,
710 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
712 if (!state
->check_bitwise_operations_allowed(loc
)) {
713 return glsl_type::error_type
;
716 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
718 * "The shift operators (<<) and (>>). For both operators, the operands
719 * must be signed or unsigned integers or integer vectors. One operand
720 * can be signed while the other is unsigned."
722 if (!type_a
->is_integer()) {
723 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
724 "integer vector", ast_expression::operator_string(op
));
725 return glsl_type::error_type
;
728 if (!type_b
->is_integer()) {
729 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
730 "integer vector", ast_expression::operator_string(op
));
731 return glsl_type::error_type
;
734 /* "If the first operand is a scalar, the second operand has to be
737 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
738 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
739 "second must be scalar as well",
740 ast_expression::operator_string(op
));
741 return glsl_type::error_type
;
744 /* If both operands are vectors, check that they have same number of
747 if (type_a
->is_vector() &&
748 type_b
->is_vector() &&
749 type_a
->vector_elements
!= type_b
->vector_elements
) {
750 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
751 "have same number of elements",
752 ast_expression::operator_string(op
));
753 return glsl_type::error_type
;
756 /* "In all cases, the resulting type will be the same type as the left
763 * Returns the innermost array index expression in an rvalue tree.
764 * This is the largest indexing level -- if an array of blocks, then
765 * it is the block index rather than an indexing expression for an
766 * array-typed member of an array of blocks.
769 find_innermost_array_index(ir_rvalue
*rv
)
771 ir_dereference_array
*last
= NULL
;
773 if (rv
->as_dereference_array()) {
774 last
= rv
->as_dereference_array();
776 } else if (rv
->as_dereference_record())
777 rv
= rv
->as_dereference_record()->record
;
778 else if (rv
->as_swizzle())
779 rv
= rv
->as_swizzle()->val
;
785 return last
->array_index
;
791 * Validates that a value can be assigned to a location with a specified type
793 * Validates that \c rhs can be assigned to some location. If the types are
794 * not an exact match but an automatic conversion is possible, \c rhs will be
798 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
799 * Otherwise the actual RHS to be assigned will be returned. This may be
800 * \c rhs, or it may be \c rhs after some type conversion.
803 * In addition to being used for assignments, this function is used to
804 * type-check return values.
807 validate_assignment(struct _mesa_glsl_parse_state
*state
,
808 YYLTYPE loc
, ir_rvalue
*lhs
,
809 ir_rvalue
*rhs
, bool is_initializer
)
811 /* If there is already some error in the RHS, just return it. Anything
812 * else will lead to an avalanche of error message back to the user.
814 if (rhs
->type
->is_error())
817 /* In the Tessellation Control Shader:
818 * If a per-vertex output variable is used as an l-value, it is an error
819 * if the expression indicating the vertex number is not the identifier
822 if (state
->stage
== MESA_SHADER_TESS_CTRL
&& !lhs
->type
->is_error()) {
823 ir_variable
*var
= lhs
->variable_referenced();
824 if (var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
825 ir_rvalue
*index
= find_innermost_array_index(lhs
);
826 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
827 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
828 _mesa_glsl_error(&loc
, state
,
829 "Tessellation control shader outputs can only "
830 "be indexed by gl_InvocationID");
836 /* If the types are identical, the assignment can trivially proceed.
838 if (rhs
->type
== lhs
->type
)
841 /* If the array element types are the same and the LHS is unsized,
842 * the assignment is okay for initializers embedded in variable
845 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
846 * is handled by ir_dereference::is_lvalue.
848 const glsl_type
*lhs_t
= lhs
->type
;
849 const glsl_type
*rhs_t
= rhs
->type
;
850 bool unsized_array
= false;
851 while(lhs_t
->is_array()) {
853 break; /* the rest of the inner arrays match so break out early */
854 if (!rhs_t
->is_array()) {
855 unsized_array
= false;
856 break; /* number of dimensions mismatch */
858 if (lhs_t
->length
== rhs_t
->length
) {
859 lhs_t
= lhs_t
->fields
.array
;
860 rhs_t
= rhs_t
->fields
.array
;
862 } else if (lhs_t
->is_unsized_array()) {
863 unsized_array
= true;
865 unsized_array
= false;
866 break; /* sized array mismatch */
868 lhs_t
= lhs_t
->fields
.array
;
869 rhs_t
= rhs_t
->fields
.array
;
872 if (is_initializer
) {
875 _mesa_glsl_error(&loc
, state
,
876 "implicitly sized arrays cannot be assigned");
881 /* Check for implicit conversion in GLSL 1.20 */
882 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
883 if (rhs
->type
== lhs
->type
)
887 _mesa_glsl_error(&loc
, state
,
888 "%s of type %s cannot be assigned to "
889 "variable of type %s",
890 is_initializer
? "initializer" : "value",
891 rhs
->type
->name
, lhs
->type
->name
);
897 mark_whole_array_access(ir_rvalue
*access
)
899 ir_dereference_variable
*deref
= access
->as_dereference_variable();
901 if (deref
&& deref
->var
) {
902 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
907 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
908 const char *non_lvalue_description
,
909 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
910 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
915 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
917 ir_variable
*lhs_var
= lhs
->variable_referenced();
919 lhs_var
->data
.assigned
= true;
921 if (!error_emitted
) {
922 if (non_lvalue_description
!= NULL
) {
923 _mesa_glsl_error(&lhs_loc
, state
,
925 non_lvalue_description
);
926 error_emitted
= true;
927 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
928 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
929 lhs_var
->data
.image_read_only
))) {
930 /* We can have image_read_only set on both images and buffer variables,
931 * but in the former there is a distinction between assignments to
932 * the variable itself (read_only) and to the memory they point to
933 * (image_read_only), while in the case of buffer variables there is
934 * no such distinction, that is why this check here is limited to
935 * buffer variables alone.
937 _mesa_glsl_error(&lhs_loc
, state
,
938 "assignment to read-only variable '%s'",
940 error_emitted
= true;
941 } else if (lhs
->type
->is_array() &&
942 !state
->check_version(120, 300, &lhs_loc
,
943 "whole array assignment forbidden")) {
944 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
946 * "Other binary or unary expressions, non-dereferenced
947 * arrays, function names, swizzles with repeated fields,
948 * and constants cannot be l-values."
950 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
952 error_emitted
= true;
953 } else if (!lhs
->is_lvalue()) {
954 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
955 error_emitted
= true;
960 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
961 if (new_rhs
!= NULL
) {
964 /* If the LHS array was not declared with a size, it takes it size from
965 * the RHS. If the LHS is an l-value and a whole array, it must be a
966 * dereference of a variable. Any other case would require that the LHS
967 * is either not an l-value or not a whole array.
969 if (lhs
->type
->is_unsized_array()) {
970 ir_dereference
*const d
= lhs
->as_dereference();
974 ir_variable
*const var
= d
->variable_referenced();
978 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
979 /* FINISHME: This should actually log the location of the RHS. */
980 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
982 var
->data
.max_array_access
);
985 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
986 rhs
->type
->array_size());
989 if (lhs
->type
->is_array()) {
990 mark_whole_array_access(rhs
);
991 mark_whole_array_access(lhs
);
995 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
996 * but not post_inc) need the converted assigned value as an rvalue
997 * to handle things like:
1002 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1004 instructions
->push_tail(var
);
1005 instructions
->push_tail(assign(var
, rhs
));
1007 if (!error_emitted
) {
1008 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
1009 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1011 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
1013 *out_rvalue
= rvalue
;
1016 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1020 return error_emitted
;
1024 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1026 void *ctx
= ralloc_parent(lvalue
);
1029 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1031 instructions
->push_tail(var
);
1033 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1036 return new(ctx
) ir_dereference_variable(var
);
1041 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1043 (void) instructions
;
1050 ast_node::has_sequence_subexpression() const
1056 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1057 struct _mesa_glsl_parse_state
*state
)
1059 (void)hir(instructions
, state
);
1063 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1064 struct _mesa_glsl_parse_state
*state
)
1066 (void)hir(instructions
, state
);
1070 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1073 ir_rvalue
*cmp
= NULL
;
1075 if (operation
== ir_binop_all_equal
)
1076 join_op
= ir_binop_logic_and
;
1078 join_op
= ir_binop_logic_or
;
1080 switch (op0
->type
->base_type
) {
1081 case GLSL_TYPE_FLOAT
:
1082 case GLSL_TYPE_UINT
:
1084 case GLSL_TYPE_BOOL
:
1085 case GLSL_TYPE_DOUBLE
:
1086 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1088 case GLSL_TYPE_ARRAY
: {
1089 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1090 ir_rvalue
*e0
, *e1
, *result
;
1092 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1093 new(mem_ctx
) ir_constant(i
));
1094 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1095 new(mem_ctx
) ir_constant(i
));
1096 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1099 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1105 mark_whole_array_access(op0
);
1106 mark_whole_array_access(op1
);
1110 case GLSL_TYPE_STRUCT
: {
1111 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1112 ir_rvalue
*e0
, *e1
, *result
;
1113 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1115 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1117 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1119 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1122 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1130 case GLSL_TYPE_ERROR
:
1131 case GLSL_TYPE_VOID
:
1132 case GLSL_TYPE_SAMPLER
:
1133 case GLSL_TYPE_IMAGE
:
1134 case GLSL_TYPE_INTERFACE
:
1135 case GLSL_TYPE_ATOMIC_UINT
:
1136 case GLSL_TYPE_SUBROUTINE
:
1137 case GLSL_TYPE_FUNCTION
:
1138 /* I assume a comparison of a struct containing a sampler just
1139 * ignores the sampler present in the type.
1145 cmp
= new(mem_ctx
) ir_constant(true);
1150 /* For logical operations, we want to ensure that the operands are
1151 * scalar booleans. If it isn't, emit an error and return a constant
1152 * boolean to avoid triggering cascading error messages.
1155 get_scalar_boolean_operand(exec_list
*instructions
,
1156 struct _mesa_glsl_parse_state
*state
,
1157 ast_expression
*parent_expr
,
1159 const char *operand_name
,
1160 bool *error_emitted
)
1162 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1164 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1166 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1169 if (!*error_emitted
) {
1170 YYLTYPE loc
= expr
->get_location();
1171 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1173 parent_expr
->operator_string(parent_expr
->oper
));
1174 *error_emitted
= true;
1177 return new(ctx
) ir_constant(true);
1181 * If name refers to a builtin array whose maximum allowed size is less than
1182 * size, report an error and return true. Otherwise return false.
1185 check_builtin_array_max_size(const char *name
, unsigned size
,
1186 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1188 if ((strcmp("gl_TexCoord", name
) == 0)
1189 && (size
> state
->Const
.MaxTextureCoords
)) {
1190 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1192 * "The size [of gl_TexCoord] can be at most
1193 * gl_MaxTextureCoords."
1195 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1196 "be larger than gl_MaxTextureCoords (%u)",
1197 state
->Const
.MaxTextureCoords
);
1198 } else if (strcmp("gl_ClipDistance", name
) == 0
1199 && size
> state
->Const
.MaxClipPlanes
) {
1200 /* From section 7.1 (Vertex Shader Special Variables) of the
1203 * "The gl_ClipDistance array is predeclared as unsized and
1204 * must be sized by the shader either redeclaring it with a
1205 * size or indexing it only with integral constant
1206 * expressions. ... The size can be at most
1207 * gl_MaxClipDistances."
1209 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1210 "be larger than gl_MaxClipDistances (%u)",
1211 state
->Const
.MaxClipPlanes
);
1216 * Create the constant 1, of a which is appropriate for incrementing and
1217 * decrementing values of the given GLSL type. For example, if type is vec4,
1218 * this creates a constant value of 1.0 having type float.
1220 * If the given type is invalid for increment and decrement operators, return
1221 * a floating point 1--the error will be detected later.
1224 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1226 switch (type
->base_type
) {
1227 case GLSL_TYPE_UINT
:
1228 return new(ctx
) ir_constant((unsigned) 1);
1230 return new(ctx
) ir_constant(1);
1232 case GLSL_TYPE_FLOAT
:
1233 return new(ctx
) ir_constant(1.0f
);
1238 ast_expression::hir(exec_list
*instructions
,
1239 struct _mesa_glsl_parse_state
*state
)
1241 return do_hir(instructions
, state
, true);
1245 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1246 struct _mesa_glsl_parse_state
*state
)
1248 do_hir(instructions
, state
, false);
1252 ast_expression::set_is_lhs(bool new_value
)
1254 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1255 * if we lack a identifier we can just skip it.
1257 if (this->primary_expression
.identifier
== NULL
)
1260 this->is_lhs
= new_value
;
1262 /* We need to go through the subexpressions tree to cover cases like
1263 * ast_field_selection
1265 if (this->subexpressions
[0] != NULL
)
1266 this->subexpressions
[0]->set_is_lhs(new_value
);
1270 ast_expression::do_hir(exec_list
*instructions
,
1271 struct _mesa_glsl_parse_state
*state
,
1275 static const int operations
[AST_NUM_OPERATORS
] = {
1276 -1, /* ast_assign doesn't convert to ir_expression. */
1277 -1, /* ast_plus doesn't convert to ir_expression. */
1291 ir_binop_any_nequal
,
1301 /* Note: The following block of expression types actually convert
1302 * to multiple IR instructions.
1304 ir_binop_mul
, /* ast_mul_assign */
1305 ir_binop_div
, /* ast_div_assign */
1306 ir_binop_mod
, /* ast_mod_assign */
1307 ir_binop_add
, /* ast_add_assign */
1308 ir_binop_sub
, /* ast_sub_assign */
1309 ir_binop_lshift
, /* ast_ls_assign */
1310 ir_binop_rshift
, /* ast_rs_assign */
1311 ir_binop_bit_and
, /* ast_and_assign */
1312 ir_binop_bit_xor
, /* ast_xor_assign */
1313 ir_binop_bit_or
, /* ast_or_assign */
1315 -1, /* ast_conditional doesn't convert to ir_expression. */
1316 ir_binop_add
, /* ast_pre_inc. */
1317 ir_binop_sub
, /* ast_pre_dec. */
1318 ir_binop_add
, /* ast_post_inc. */
1319 ir_binop_sub
, /* ast_post_dec. */
1320 -1, /* ast_field_selection doesn't conv to ir_expression. */
1321 -1, /* ast_array_index doesn't convert to ir_expression. */
1322 -1, /* ast_function_call doesn't conv to ir_expression. */
1323 -1, /* ast_identifier doesn't convert to ir_expression. */
1324 -1, /* ast_int_constant doesn't convert to ir_expression. */
1325 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1326 -1, /* ast_float_constant doesn't conv to ir_expression. */
1327 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1328 -1, /* ast_sequence doesn't convert to ir_expression. */
1330 ir_rvalue
*result
= NULL
;
1332 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1333 bool error_emitted
= false;
1336 loc
= this->get_location();
1338 switch (this->oper
) {
1340 assert(!"ast_aggregate: Should never get here.");
1344 this->subexpressions
[0]->set_is_lhs(true);
1345 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1346 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1349 do_assignment(instructions
, state
,
1350 this->subexpressions
[0]->non_lvalue_description
,
1351 op
[0], op
[1], &result
, needs_rvalue
, false,
1352 this->subexpressions
[0]->get_location());
1357 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1359 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1361 error_emitted
= type
->is_error();
1367 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1369 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1371 error_emitted
= type
->is_error();
1373 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1381 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1382 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1384 type
= arithmetic_result_type(op
[0], op
[1],
1385 (this->oper
== ast_mul
),
1387 error_emitted
= type
->is_error();
1389 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1394 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1395 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1397 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1399 assert(operations
[this->oper
] == ir_binop_mod
);
1401 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1403 error_emitted
= type
->is_error();
1408 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1409 error_emitted
= true;
1412 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1413 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1414 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1416 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1418 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1425 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1426 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1428 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1430 /* The relational operators must either generate an error or result
1431 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1433 assert(type
->is_error()
1434 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1435 && type
->is_scalar()));
1437 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1439 error_emitted
= type
->is_error();
1444 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1445 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1447 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1449 * "The equality operators equal (==), and not equal (!=)
1450 * operate on all types. They result in a scalar Boolean. If
1451 * the operand types do not match, then there must be a
1452 * conversion from Section 4.1.10 "Implicit Conversions"
1453 * applied to one operand that can make them match, in which
1454 * case this conversion is done."
1457 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1458 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1459 "no operation `%1$s' exists that takes a left-hand "
1460 "operand of type 'void' or a right operand of type "
1461 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1462 error_emitted
= true;
1463 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1464 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1465 || (op
[0]->type
!= op
[1]->type
)) {
1466 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1467 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1468 error_emitted
= true;
1469 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1470 !state
->check_version(120, 300, &loc
,
1471 "array comparisons forbidden")) {
1472 error_emitted
= true;
1473 } else if ((op
[0]->type
->contains_opaque() ||
1474 op
[1]->type
->contains_opaque())) {
1475 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1476 error_emitted
= true;
1479 if (error_emitted
) {
1480 result
= new(ctx
) ir_constant(false);
1482 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1483 assert(result
->type
== glsl_type::bool_type
);
1490 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1491 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1492 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1493 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1495 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1499 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1501 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1502 error_emitted
= true;
1505 if (!op
[0]->type
->is_integer()) {
1506 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1507 error_emitted
= true;
1510 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1511 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1514 case ast_logic_and
: {
1515 exec_list rhs_instructions
;
1516 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1517 "LHS", &error_emitted
);
1518 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1519 "RHS", &error_emitted
);
1521 if (rhs_instructions
.is_empty()) {
1522 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1523 type
= result
->type
;
1525 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1528 instructions
->push_tail(tmp
);
1530 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1531 instructions
->push_tail(stmt
);
1533 stmt
->then_instructions
.append_list(&rhs_instructions
);
1534 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1535 ir_assignment
*const then_assign
=
1536 new(ctx
) ir_assignment(then_deref
, op
[1]);
1537 stmt
->then_instructions
.push_tail(then_assign
);
1539 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1540 ir_assignment
*const else_assign
=
1541 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1542 stmt
->else_instructions
.push_tail(else_assign
);
1544 result
= new(ctx
) ir_dereference_variable(tmp
);
1550 case ast_logic_or
: {
1551 exec_list rhs_instructions
;
1552 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1553 "LHS", &error_emitted
);
1554 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1555 "RHS", &error_emitted
);
1557 if (rhs_instructions
.is_empty()) {
1558 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1559 type
= result
->type
;
1561 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1564 instructions
->push_tail(tmp
);
1566 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1567 instructions
->push_tail(stmt
);
1569 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1570 ir_assignment
*const then_assign
=
1571 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1572 stmt
->then_instructions
.push_tail(then_assign
);
1574 stmt
->else_instructions
.append_list(&rhs_instructions
);
1575 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1576 ir_assignment
*const else_assign
=
1577 new(ctx
) ir_assignment(else_deref
, op
[1]);
1578 stmt
->else_instructions
.push_tail(else_assign
);
1580 result
= new(ctx
) ir_dereference_variable(tmp
);
1587 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1589 * "The logical binary operators and (&&), or ( | | ), and
1590 * exclusive or (^^). They operate only on two Boolean
1591 * expressions and result in a Boolean expression."
1593 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1595 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1598 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1603 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1604 "operand", &error_emitted
);
1606 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1610 case ast_mul_assign
:
1611 case ast_div_assign
:
1612 case ast_add_assign
:
1613 case ast_sub_assign
: {
1614 this->subexpressions
[0]->set_is_lhs(true);
1615 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1616 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1618 type
= arithmetic_result_type(op
[0], op
[1],
1619 (this->oper
== ast_mul_assign
),
1622 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1626 do_assignment(instructions
, state
,
1627 this->subexpressions
[0]->non_lvalue_description
,
1628 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1629 &result
, needs_rvalue
, false,
1630 this->subexpressions
[0]->get_location());
1632 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1633 * explicitly test for this because none of the binary expression
1634 * operators allow array operands either.
1640 case ast_mod_assign
: {
1641 this->subexpressions
[0]->set_is_lhs(true);
1642 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1643 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1645 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1647 assert(operations
[this->oper
] == ir_binop_mod
);
1649 ir_rvalue
*temp_rhs
;
1650 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1654 do_assignment(instructions
, state
,
1655 this->subexpressions
[0]->non_lvalue_description
,
1656 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1657 &result
, needs_rvalue
, false,
1658 this->subexpressions
[0]->get_location());
1663 case ast_rs_assign
: {
1664 this->subexpressions
[0]->set_is_lhs(true);
1665 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1666 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1667 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1669 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1670 type
, op
[0], op
[1]);
1672 do_assignment(instructions
, state
,
1673 this->subexpressions
[0]->non_lvalue_description
,
1674 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1675 &result
, needs_rvalue
, false,
1676 this->subexpressions
[0]->get_location());
1680 case ast_and_assign
:
1681 case ast_xor_assign
:
1682 case ast_or_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
);
1686 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1687 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1688 type
, op
[0], op
[1]);
1690 do_assignment(instructions
, state
,
1691 this->subexpressions
[0]->non_lvalue_description
,
1692 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1693 &result
, needs_rvalue
, false,
1694 this->subexpressions
[0]->get_location());
1698 case ast_conditional
: {
1699 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1701 * "The ternary selection operator (?:). It operates on three
1702 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1703 * first expression, which must result in a scalar Boolean."
1705 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1706 "condition", &error_emitted
);
1708 /* The :? operator is implemented by generating an anonymous temporary
1709 * followed by an if-statement. The last instruction in each branch of
1710 * the if-statement assigns a value to the anonymous temporary. This
1711 * temporary is the r-value of the expression.
1713 exec_list then_instructions
;
1714 exec_list else_instructions
;
1716 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1717 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1719 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1721 * "The second and third expressions can be any type, as
1722 * long their types match, or there is a conversion in
1723 * Section 4.1.10 "Implicit Conversions" that can be applied
1724 * to one of the expressions to make their types match. This
1725 * resulting matching type is the type of the entire
1728 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1729 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1730 || (op
[1]->type
!= op
[2]->type
)) {
1731 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1733 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1734 "operator must have matching types");
1735 error_emitted
= true;
1736 type
= glsl_type::error_type
;
1741 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1743 * "The second and third expressions must be the same type, but can
1744 * be of any type other than an array."
1746 if (type
->is_array() &&
1747 !state
->check_version(120, 300, &loc
,
1748 "second and third operands of ?: operator "
1749 "cannot be arrays")) {
1750 error_emitted
= true;
1753 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1755 * "Except for array indexing, structure member selection, and
1756 * parentheses, opaque variables are not allowed to be operands in
1757 * expressions; such use results in a compile-time error."
1759 if (type
->contains_opaque()) {
1760 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1761 "of the ?: operator");
1762 error_emitted
= true;
1765 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1767 if (then_instructions
.is_empty()
1768 && else_instructions
.is_empty()
1769 && cond_val
!= NULL
) {
1770 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1772 /* The copy to conditional_tmp reads the whole array. */
1773 if (type
->is_array()) {
1774 mark_whole_array_access(op
[1]);
1775 mark_whole_array_access(op
[2]);
1778 ir_variable
*const tmp
=
1779 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1780 instructions
->push_tail(tmp
);
1782 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1783 instructions
->push_tail(stmt
);
1785 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1786 ir_dereference
*const then_deref
=
1787 new(ctx
) ir_dereference_variable(tmp
);
1788 ir_assignment
*const then_assign
=
1789 new(ctx
) ir_assignment(then_deref
, op
[1]);
1790 stmt
->then_instructions
.push_tail(then_assign
);
1792 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1793 ir_dereference
*const else_deref
=
1794 new(ctx
) ir_dereference_variable(tmp
);
1795 ir_assignment
*const else_assign
=
1796 new(ctx
) ir_assignment(else_deref
, op
[2]);
1797 stmt
->else_instructions
.push_tail(else_assign
);
1799 result
= new(ctx
) ir_dereference_variable(tmp
);
1806 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1807 ? "pre-increment operation" : "pre-decrement operation";
1809 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1810 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1812 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1814 ir_rvalue
*temp_rhs
;
1815 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1819 do_assignment(instructions
, state
,
1820 this->subexpressions
[0]->non_lvalue_description
,
1821 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1822 &result
, needs_rvalue
, false,
1823 this->subexpressions
[0]->get_location());
1828 case ast_post_dec
: {
1829 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1830 ? "post-increment operation" : "post-decrement operation";
1831 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1832 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1834 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1836 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1838 ir_rvalue
*temp_rhs
;
1839 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1842 /* Get a temporary of a copy of the lvalue before it's modified.
1843 * This may get thrown away later.
1845 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1847 ir_rvalue
*junk_rvalue
;
1849 do_assignment(instructions
, state
,
1850 this->subexpressions
[0]->non_lvalue_description
,
1851 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1852 &junk_rvalue
, false, false,
1853 this->subexpressions
[0]->get_location());
1858 case ast_field_selection
:
1859 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1862 case ast_array_index
: {
1863 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1865 /* Getting if an array is being used uninitialized is beyond what we get
1866 * from ir_value.data.assigned. Setting is_lhs as true would force to
1867 * not raise a uninitialized warning when using an array
1869 subexpressions
[0]->set_is_lhs(true);
1870 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1871 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1873 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1876 if (result
->type
->is_error())
1877 error_emitted
= true;
1882 case ast_unsized_array_dim
:
1883 assert(!"ast_unsized_array_dim: Should never get here.");
1886 case ast_function_call
:
1887 /* Should *NEVER* get here. ast_function_call should always be handled
1888 * by ast_function_expression::hir.
1893 case ast_identifier
: {
1894 /* ast_identifier can appear several places in a full abstract syntax
1895 * tree. This particular use must be at location specified in the grammar
1896 * as 'variable_identifier'.
1899 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1902 var
->data
.used
= true;
1903 result
= new(ctx
) ir_dereference_variable(var
);
1905 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
1907 && result
->variable_referenced()->data
.assigned
!= true) {
1908 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
1909 this->primary_expression
.identifier
);
1912 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1913 this->primary_expression
.identifier
);
1915 result
= ir_rvalue::error_value(ctx
);
1916 error_emitted
= true;
1921 case ast_int_constant
:
1922 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1925 case ast_uint_constant
:
1926 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1929 case ast_float_constant
:
1930 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1933 case ast_bool_constant
:
1934 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1937 case ast_double_constant
:
1938 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1941 case ast_sequence
: {
1942 /* It should not be possible to generate a sequence in the AST without
1943 * any expressions in it.
1945 assert(!this->expressions
.is_empty());
1947 /* The r-value of a sequence is the last expression in the sequence. If
1948 * the other expressions in the sequence do not have side-effects (and
1949 * therefore add instructions to the instruction list), they get dropped
1952 exec_node
*previous_tail_pred
= NULL
;
1953 YYLTYPE previous_operand_loc
= loc
;
1955 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1956 /* If one of the operands of comma operator does not generate any
1957 * code, we want to emit a warning. At each pass through the loop
1958 * previous_tail_pred will point to the last instruction in the
1959 * stream *before* processing the previous operand. Naturally,
1960 * instructions->tail_pred will point to the last instruction in the
1961 * stream *after* processing the previous operand. If the two
1962 * pointers match, then the previous operand had no effect.
1964 * The warning behavior here differs slightly from GCC. GCC will
1965 * only emit a warning if none of the left-hand operands have an
1966 * effect. However, it will emit a warning for each. I believe that
1967 * there are some cases in C (especially with GCC extensions) where
1968 * it is useful to have an intermediate step in a sequence have no
1969 * effect, but I don't think these cases exist in GLSL. Either way,
1970 * it would be a giant hassle to replicate that behavior.
1972 if (previous_tail_pred
== instructions
->tail_pred
) {
1973 _mesa_glsl_warning(&previous_operand_loc
, state
,
1974 "left-hand operand of comma expression has "
1978 /* tail_pred is directly accessed instead of using the get_tail()
1979 * method for performance reasons. get_tail() has extra code to
1980 * return NULL when the list is empty. We don't care about that
1981 * here, so using tail_pred directly is fine.
1983 previous_tail_pred
= instructions
->tail_pred
;
1984 previous_operand_loc
= ast
->get_location();
1986 result
= ast
->hir(instructions
, state
);
1989 /* Any errors should have already been emitted in the loop above.
1991 error_emitted
= true;
1995 type
= NULL
; /* use result->type, not type. */
1996 assert(result
!= NULL
|| !needs_rvalue
);
1998 if (result
&& result
->type
->is_error() && !error_emitted
)
1999 _mesa_glsl_error(& loc
, state
, "type mismatch");
2005 ast_expression::has_sequence_subexpression() const
2007 switch (this->oper
) {
2016 return this->subexpressions
[0]->has_sequence_subexpression();
2038 case ast_array_index
:
2039 case ast_mul_assign
:
2040 case ast_div_assign
:
2041 case ast_add_assign
:
2042 case ast_sub_assign
:
2043 case ast_mod_assign
:
2046 case ast_and_assign
:
2047 case ast_xor_assign
:
2049 return this->subexpressions
[0]->has_sequence_subexpression() ||
2050 this->subexpressions
[1]->has_sequence_subexpression();
2052 case ast_conditional
:
2053 return this->subexpressions
[0]->has_sequence_subexpression() ||
2054 this->subexpressions
[1]->has_sequence_subexpression() ||
2055 this->subexpressions
[2]->has_sequence_subexpression();
2060 case ast_field_selection
:
2061 case ast_identifier
:
2062 case ast_int_constant
:
2063 case ast_uint_constant
:
2064 case ast_float_constant
:
2065 case ast_bool_constant
:
2066 case ast_double_constant
:
2070 unreachable("ast_aggregate: Should never get here.");
2072 case ast_function_call
:
2073 unreachable("should be handled by ast_function_expression::hir");
2075 case ast_unsized_array_dim
:
2076 unreachable("ast_unsized_array_dim: Should never get here.");
2083 ast_expression_statement::hir(exec_list
*instructions
,
2084 struct _mesa_glsl_parse_state
*state
)
2086 /* It is possible to have expression statements that don't have an
2087 * expression. This is the solitary semicolon:
2089 * for (i = 0; i < 5; i++)
2092 * In this case the expression will be NULL. Test for NULL and don't do
2093 * anything in that case.
2095 if (expression
!= NULL
)
2096 expression
->hir_no_rvalue(instructions
, state
);
2098 /* Statements do not have r-values.
2105 ast_compound_statement::hir(exec_list
*instructions
,
2106 struct _mesa_glsl_parse_state
*state
)
2109 state
->symbols
->push_scope();
2111 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2112 ast
->hir(instructions
, state
);
2115 state
->symbols
->pop_scope();
2117 /* Compound statements do not have r-values.
2123 * Evaluate the given exec_node (which should be an ast_node representing
2124 * a single array dimension) and return its integer value.
2127 process_array_size(exec_node
*node
,
2128 struct _mesa_glsl_parse_state
*state
)
2130 exec_list dummy_instructions
;
2132 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2135 * Dimensions other than the outermost dimension can by unsized if they
2136 * are immediately sized by a constructor or initializer.
2138 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2141 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2142 YYLTYPE loc
= array_size
->get_location();
2145 _mesa_glsl_error(& loc
, state
,
2146 "array size could not be resolved");
2150 if (!ir
->type
->is_integer()) {
2151 _mesa_glsl_error(& loc
, state
,
2152 "array size must be integer type");
2156 if (!ir
->type
->is_scalar()) {
2157 _mesa_glsl_error(& loc
, state
,
2158 "array size must be scalar type");
2162 ir_constant
*const size
= ir
->constant_expression_value();
2164 (state
->is_version(120, 300) &&
2165 array_size
->has_sequence_subexpression())) {
2166 _mesa_glsl_error(& loc
, state
, "array size must be a "
2167 "constant valued expression");
2171 if (size
->value
.i
[0] <= 0) {
2172 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2176 assert(size
->type
== ir
->type
);
2178 /* If the array size is const (and we've verified that
2179 * it is) then no instructions should have been emitted
2180 * when we converted it to HIR. If they were emitted,
2181 * then either the array size isn't const after all, or
2182 * we are emitting unnecessary instructions.
2184 assert(dummy_instructions
.is_empty());
2186 return size
->value
.u
[0];
2189 static const glsl_type
*
2190 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2191 ast_array_specifier
*array_specifier
,
2192 struct _mesa_glsl_parse_state
*state
)
2194 const glsl_type
*array_type
= base
;
2196 if (array_specifier
!= NULL
) {
2197 if (base
->is_array()) {
2199 /* From page 19 (page 25) of the GLSL 1.20 spec:
2201 * "Only one-dimensional arrays may be declared."
2203 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2204 return glsl_type::error_type
;
2208 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2209 !node
->is_head_sentinel(); node
= node
->prev
) {
2210 unsigned array_size
= process_array_size(node
, state
);
2211 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2219 precision_qualifier_allowed(const glsl_type
*type
)
2221 /* Precision qualifiers apply to floating point, integer and opaque
2224 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2225 * "Any floating point or any integer declaration can have the type
2226 * preceded by one of these precision qualifiers [...] Literal
2227 * constants do not have precision qualifiers. Neither do Boolean
2230 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2233 * "Precision qualifiers are added for code portability with OpenGL
2234 * ES, not for functionality. They have the same syntax as in OpenGL
2237 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2239 * "uniform lowp sampler2D sampler;
2242 * lowp vec4 col = texture2D (sampler, coord);
2243 * // texture2D returns lowp"
2245 * From this, we infer that GLSL 1.30 (and later) should allow precision
2246 * qualifiers on sampler types just like float and integer types.
2248 return (type
->is_float()
2249 || type
->is_integer()
2250 || type
->contains_opaque())
2251 && !type
->without_array()->is_record();
2255 ast_type_specifier::glsl_type(const char **name
,
2256 struct _mesa_glsl_parse_state
*state
) const
2258 const struct glsl_type
*type
;
2260 type
= state
->symbols
->get_type(this->type_name
);
2261 *name
= this->type_name
;
2263 YYLTYPE loc
= this->get_location();
2264 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2270 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2272 * "The precision statement
2274 * precision precision-qualifier type;
2276 * can be used to establish a default precision qualifier. The type field can
2277 * be either int or float or any of the sampler types, (...) If type is float,
2278 * the directive applies to non-precision-qualified floating point type
2279 * (scalar, vector, and matrix) declarations. If type is int, the directive
2280 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2281 * and unsigned) declarations."
2283 * We use the symbol table to keep the values of the default precisions for
2284 * each 'type' in each scope and we use the 'type' string from the precision
2285 * statement as key in the symbol table. When we want to retrieve the default
2286 * precision associated with a given glsl_type we need to know the type string
2287 * associated with it. This is what this function returns.
2290 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2292 switch (type
->base_type
) {
2293 case GLSL_TYPE_FLOAT
:
2295 case GLSL_TYPE_UINT
:
2298 case GLSL_TYPE_ATOMIC_UINT
:
2299 return "atomic_uint";
2300 case GLSL_TYPE_IMAGE
:
2302 case GLSL_TYPE_SAMPLER
: {
2303 const unsigned type_idx
=
2304 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2305 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2306 assert(type_idx
< 4);
2307 switch (type
->sampled_type
) {
2308 case GLSL_TYPE_FLOAT
:
2309 switch (type
->sampler_dimensionality
) {
2310 case GLSL_SAMPLER_DIM_1D
: {
2311 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2312 static const char *const names
[4] = {
2313 "sampler1D", "sampler1DArray",
2314 "sampler1DShadow", "sampler1DArrayShadow"
2316 return names
[type_idx
];
2318 case GLSL_SAMPLER_DIM_2D
: {
2319 static const char *const names
[8] = {
2320 "sampler2D", "sampler2DArray",
2321 "sampler2DShadow", "sampler2DArrayShadow",
2322 "image2D", "image2DArray", NULL
, NULL
2324 return names
[offset
+ type_idx
];
2326 case GLSL_SAMPLER_DIM_3D
: {
2327 static const char *const names
[8] = {
2328 "sampler3D", NULL
, NULL
, NULL
,
2329 "image3D", NULL
, NULL
, NULL
2331 return names
[offset
+ type_idx
];
2333 case GLSL_SAMPLER_DIM_CUBE
: {
2334 static const char *const names
[8] = {
2335 "samplerCube", "samplerCubeArray",
2336 "samplerCubeShadow", "samplerCubeArrayShadow",
2337 "imageCube", NULL
, NULL
, NULL
2339 return names
[offset
+ type_idx
];
2341 case GLSL_SAMPLER_DIM_MS
: {
2342 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2343 static const char *const names
[4] = {
2344 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2346 return names
[type_idx
];
2348 case GLSL_SAMPLER_DIM_RECT
: {
2349 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2350 static const char *const names
[4] = {
2351 "samplerRect", NULL
, "samplerRectShadow", NULL
2353 return names
[type_idx
];
2355 case GLSL_SAMPLER_DIM_BUF
: {
2356 static const char *const names
[8] = {
2357 "samplerBuffer", NULL
, NULL
, NULL
,
2358 "imageBuffer", NULL
, NULL
, NULL
2360 return names
[offset
+ type_idx
];
2362 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2363 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2364 static const char *const names
[4] = {
2365 "samplerExternalOES", NULL
, NULL
, NULL
2367 return names
[type_idx
];
2370 unreachable("Unsupported sampler/image dimensionality");
2371 } /* sampler/image float dimensionality */
2374 switch (type
->sampler_dimensionality
) {
2375 case GLSL_SAMPLER_DIM_1D
: {
2376 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2377 static const char *const names
[4] = {
2378 "isampler1D", "isampler1DArray", NULL
, NULL
2380 return names
[type_idx
];
2382 case GLSL_SAMPLER_DIM_2D
: {
2383 static const char *const names
[8] = {
2384 "isampler2D", "isampler2DArray", NULL
, NULL
,
2385 "iimage2D", "iimage2DArray", NULL
, NULL
2387 return names
[offset
+ type_idx
];
2389 case GLSL_SAMPLER_DIM_3D
: {
2390 static const char *const names
[8] = {
2391 "isampler3D", NULL
, NULL
, NULL
,
2392 "iimage3D", NULL
, NULL
, NULL
2394 return names
[offset
+ type_idx
];
2396 case GLSL_SAMPLER_DIM_CUBE
: {
2397 static const char *const names
[8] = {
2398 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2399 "iimageCube", NULL
, NULL
, NULL
2401 return names
[offset
+ type_idx
];
2403 case GLSL_SAMPLER_DIM_MS
: {
2404 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2405 static const char *const names
[4] = {
2406 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2408 return names
[type_idx
];
2410 case GLSL_SAMPLER_DIM_RECT
: {
2411 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2412 static const char *const names
[4] = {
2413 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2415 return names
[type_idx
];
2417 case GLSL_SAMPLER_DIM_BUF
: {
2418 static const char *const names
[8] = {
2419 "isamplerBuffer", NULL
, NULL
, NULL
,
2420 "iimageBuffer", NULL
, NULL
, NULL
2422 return names
[offset
+ type_idx
];
2425 unreachable("Unsupported isampler/iimage dimensionality");
2426 } /* sampler/image int dimensionality */
2428 case GLSL_TYPE_UINT
:
2429 switch (type
->sampler_dimensionality
) {
2430 case GLSL_SAMPLER_DIM_1D
: {
2431 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2432 static const char *const names
[4] = {
2433 "usampler1D", "usampler1DArray", NULL
, NULL
2435 return names
[type_idx
];
2437 case GLSL_SAMPLER_DIM_2D
: {
2438 static const char *const names
[8] = {
2439 "usampler2D", "usampler2DArray", NULL
, NULL
,
2440 "uimage2D", "uimage2DArray", NULL
, NULL
2442 return names
[offset
+ type_idx
];
2444 case GLSL_SAMPLER_DIM_3D
: {
2445 static const char *const names
[8] = {
2446 "usampler3D", NULL
, NULL
, NULL
,
2447 "uimage3D", NULL
, NULL
, NULL
2449 return names
[offset
+ type_idx
];
2451 case GLSL_SAMPLER_DIM_CUBE
: {
2452 static const char *const names
[8] = {
2453 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2454 "uimageCube", NULL
, NULL
, NULL
2456 return names
[offset
+ type_idx
];
2458 case GLSL_SAMPLER_DIM_MS
: {
2459 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2460 static const char *const names
[4] = {
2461 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2463 return names
[type_idx
];
2465 case GLSL_SAMPLER_DIM_RECT
: {
2466 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2467 static const char *const names
[4] = {
2468 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2470 return names
[type_idx
];
2472 case GLSL_SAMPLER_DIM_BUF
: {
2473 static const char *const names
[8] = {
2474 "usamplerBuffer", NULL
, NULL
, NULL
,
2475 "uimageBuffer", NULL
, NULL
, NULL
2477 return names
[offset
+ type_idx
];
2480 unreachable("Unsupported usampler/uimage dimensionality");
2481 } /* sampler/image uint dimensionality */
2484 unreachable("Unsupported sampler/image type");
2485 } /* sampler/image type */
2487 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2490 unreachable("Unsupported type");
2495 select_gles_precision(unsigned qual_precision
,
2496 const glsl_type
*type
,
2497 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2499 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2500 * In GLES we take the precision from the type qualifier if present,
2501 * otherwise, if the type of the variable allows precision qualifiers at
2502 * all, we look for the default precision qualifier for that type in the
2505 assert(state
->es_shader
);
2507 unsigned precision
= GLSL_PRECISION_NONE
;
2508 if (qual_precision
) {
2509 precision
= qual_precision
;
2510 } else if (precision_qualifier_allowed(type
)) {
2511 const char *type_name
=
2512 get_type_name_for_precision_qualifier(type
->without_array());
2513 assert(type_name
!= NULL
);
2516 state
->symbols
->get_default_precision_qualifier(type_name
);
2517 if (precision
== ast_precision_none
) {
2518 _mesa_glsl_error(loc
, state
,
2519 "No precision specified in this scope for type `%s'",
2527 ast_fully_specified_type::glsl_type(const char **name
,
2528 struct _mesa_glsl_parse_state
*state
) const
2530 return this->specifier
->glsl_type(name
, state
);
2534 * Determine whether a toplevel variable declaration declares a varying. This
2535 * function operates by examining the variable's mode and the shader target,
2536 * so it correctly identifies linkage variables regardless of whether they are
2537 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2539 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2540 * this function will produce undefined results.
2543 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2546 case MESA_SHADER_VERTEX
:
2547 return var
->data
.mode
== ir_var_shader_out
;
2548 case MESA_SHADER_FRAGMENT
:
2549 return var
->data
.mode
== ir_var_shader_in
;
2551 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2557 * Matrix layout qualifiers are only allowed on certain types
2560 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2562 const glsl_type
*type
,
2565 if (var
&& !var
->is_in_buffer_block()) {
2566 /* Layout qualifiers may only apply to interface blocks and fields in
2569 _mesa_glsl_error(loc
, state
,
2570 "uniform block layout qualifiers row_major and "
2571 "column_major may not be applied to variables "
2572 "outside of uniform blocks");
2573 } else if (!type
->without_array()->is_matrix()) {
2574 /* The OpenGL ES 3.0 conformance tests did not originally allow
2575 * matrix layout qualifiers on non-matrices. However, the OpenGL
2576 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2577 * amended to specifically allow these layouts on all types. Emit
2578 * a warning so that people know their code may not be portable.
2580 _mesa_glsl_warning(loc
, state
,
2581 "uniform block layout qualifiers row_major and "
2582 "column_major applied to non-matrix types may "
2583 "be rejected by older compilers");
2588 process_qualifier_constant(struct _mesa_glsl_parse_state
*state
,
2590 const char *qual_indentifier
,
2591 ast_expression
*const_expression
,
2594 exec_list dummy_instructions
;
2596 if (const_expression
== NULL
) {
2601 ir_rvalue
*const ir
= const_expression
->hir(&dummy_instructions
, state
);
2603 ir_constant
*const const_int
= ir
->constant_expression_value();
2604 if (const_int
== NULL
|| !const_int
->type
->is_integer()) {
2605 _mesa_glsl_error(loc
, state
, "%s must be an integral constant "
2606 "expression", qual_indentifier
);
2610 if (const_int
->value
.i
[0] < 0) {
2611 _mesa_glsl_error(loc
, state
, "%s layout qualifier is invalid (%d < 0)",
2612 qual_indentifier
, const_int
->value
.u
[0]);
2616 /* If the location is const (and we've verified that
2617 * it is) then no instructions should have been emitted
2618 * when we converted it to HIR. If they were emitted,
2619 * then either the location isn't const after all, or
2620 * we are emitting unnecessary instructions.
2622 assert(dummy_instructions
.is_empty());
2624 *value
= const_int
->value
.u
[0];
2629 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2632 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2633 _mesa_glsl_error(loc
, state
,
2634 "invalid stream specified %d is larger than "
2635 "MAX_VERTEX_STREAMS - 1 (%d).",
2636 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2644 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2647 const glsl_type
*type
,
2648 const ast_type_qualifier
*qual
)
2650 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2651 _mesa_glsl_error(loc
, state
,
2652 "the \"binding\" qualifier only applies to uniforms and "
2653 "shader storage buffer objects");
2657 unsigned qual_binding
;
2658 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2663 const struct gl_context
*const ctx
= state
->ctx
;
2664 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2665 unsigned max_index
= qual_binding
+ elements
- 1;
2666 const glsl_type
*base_type
= type
->without_array();
2668 if (base_type
->is_interface()) {
2669 /* UBOs. From page 60 of the GLSL 4.20 specification:
2670 * "If the binding point for any uniform block instance is less than zero,
2671 * or greater than or equal to the implementation-dependent maximum
2672 * number of uniform buffer bindings, a compilation error will occur.
2673 * When the binding identifier is used with a uniform block instanced as
2674 * an array of size N, all elements of the array from binding through
2675 * binding + N – 1 must be within this range."
2677 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2679 if (qual
->flags
.q
.uniform
&&
2680 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2681 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2682 "the maximum number of UBO binding points (%d)",
2683 qual_binding
, elements
,
2684 ctx
->Const
.MaxUniformBufferBindings
);
2688 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2689 * "If the binding point for any uniform or shader storage block instance
2690 * is less than zero, or greater than or equal to the
2691 * implementation-dependent maximum number of uniform buffer bindings, a
2692 * compile-time error will occur. When the binding identifier is used
2693 * with a uniform or shader storage block instanced as an array of size
2694 * N, all elements of the array from binding through binding + N – 1 must
2695 * be within this range."
2697 if (qual
->flags
.q
.buffer
&&
2698 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2699 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2700 "the maximum number of SSBO binding points (%d)",
2701 qual_binding
, elements
,
2702 ctx
->Const
.MaxShaderStorageBufferBindings
);
2705 } else if (base_type
->is_sampler()) {
2706 /* Samplers. From page 63 of the GLSL 4.20 specification:
2707 * "If the binding is less than zero, or greater than or equal to the
2708 * implementation-dependent maximum supported number of units, a
2709 * compilation error will occur. When the binding identifier is used
2710 * with an array of size N, all elements of the array from binding
2711 * through binding + N - 1 must be within this range."
2713 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2715 if (max_index
>= limit
) {
2716 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2717 "exceeds the maximum number of texture image units "
2718 "(%u)", qual_binding
, elements
, limit
);
2722 } else if (base_type
->contains_atomic()) {
2723 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2724 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2725 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2726 " maximum number of atomic counter buffer bindings"
2727 "(%u)", qual_binding
,
2728 ctx
->Const
.MaxAtomicBufferBindings
);
2732 } else if ((state
->is_version(420, 310) ||
2733 state
->ARB_shading_language_420pack_enable
) &&
2734 base_type
->is_image()) {
2735 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2736 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2737 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2738 " maximum number of image units (%d)", max_index
,
2739 ctx
->Const
.MaxImageUnits
);
2744 _mesa_glsl_error(loc
, state
,
2745 "the \"binding\" qualifier only applies to uniform "
2746 "blocks, opaque variables, or arrays thereof");
2750 var
->data
.explicit_binding
= true;
2751 var
->data
.binding
= qual_binding
;
2757 static glsl_interp_qualifier
2758 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2759 ir_variable_mode mode
,
2760 struct _mesa_glsl_parse_state
*state
,
2763 glsl_interp_qualifier interpolation
;
2764 if (qual
->flags
.q
.flat
)
2765 interpolation
= INTERP_QUALIFIER_FLAT
;
2766 else if (qual
->flags
.q
.noperspective
)
2767 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2768 else if (qual
->flags
.q
.smooth
)
2769 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2771 interpolation
= INTERP_QUALIFIER_NONE
;
2773 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2774 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2775 _mesa_glsl_error(loc
, state
,
2776 "interpolation qualifier `%s' can only be applied to "
2777 "shader inputs or outputs.",
2778 interpolation_string(interpolation
));
2782 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2783 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2784 _mesa_glsl_error(loc
, state
,
2785 "interpolation qualifier `%s' cannot be applied to "
2786 "vertex shader inputs or fragment shader outputs",
2787 interpolation_string(interpolation
));
2789 } else if (state
->es_shader
&&
2790 ((mode
== ir_var_shader_in
&&
2791 state
->stage
!= MESA_SHADER_VERTEX
) ||
2792 (mode
== ir_var_shader_out
&&
2793 state
->stage
!= MESA_SHADER_FRAGMENT
))) {
2794 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
2796 * "When no interpolation qualifier is present, smooth interpolation
2799 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2802 return interpolation
;
2807 apply_explicit_location(const struct ast_type_qualifier
*qual
,
2809 struct _mesa_glsl_parse_state
*state
,
2814 unsigned qual_location
;
2815 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
2820 /* Checks for GL_ARB_explicit_uniform_location. */
2821 if (qual
->flags
.q
.uniform
) {
2822 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2825 const struct gl_context
*const ctx
= state
->ctx
;
2826 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
2828 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2829 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2830 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2831 ctx
->Const
.MaxUserAssignableUniformLocations
);
2835 var
->data
.explicit_location
= true;
2836 var
->data
.location
= qual_location
;
2840 /* Between GL_ARB_explicit_attrib_location an
2841 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2842 * stage can be assigned explicit locations. The checking here associates
2843 * the correct extension with the correct stage's input / output:
2847 * vertex explicit_loc sso
2848 * tess control sso sso
2851 * fragment sso explicit_loc
2853 switch (state
->stage
) {
2854 case MESA_SHADER_VERTEX
:
2855 if (var
->data
.mode
== ir_var_shader_in
) {
2856 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2862 if (var
->data
.mode
== ir_var_shader_out
) {
2863 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2872 case MESA_SHADER_TESS_CTRL
:
2873 case MESA_SHADER_TESS_EVAL
:
2874 case MESA_SHADER_GEOMETRY
:
2875 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2876 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2885 case MESA_SHADER_FRAGMENT
:
2886 if (var
->data
.mode
== ir_var_shader_in
) {
2887 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2893 if (var
->data
.mode
== ir_var_shader_out
) {
2894 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2903 case MESA_SHADER_COMPUTE
:
2904 _mesa_glsl_error(loc
, state
,
2905 "compute shader variables cannot be given "
2906 "explicit locations");
2911 _mesa_glsl_error(loc
, state
,
2912 "%s cannot be given an explicit location in %s shader",
2914 _mesa_shader_stage_to_string(state
->stage
));
2916 var
->data
.explicit_location
= true;
2918 switch (state
->stage
) {
2919 case MESA_SHADER_VERTEX
:
2920 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2921 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
2922 : (qual_location
+ VARYING_SLOT_VAR0
);
2925 case MESA_SHADER_TESS_CTRL
:
2926 case MESA_SHADER_TESS_EVAL
:
2927 case MESA_SHADER_GEOMETRY
:
2928 if (var
->data
.patch
)
2929 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
2931 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
2934 case MESA_SHADER_FRAGMENT
:
2935 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2936 ? (qual_location
+ FRAG_RESULT_DATA0
)
2937 : (qual_location
+ VARYING_SLOT_VAR0
);
2939 case MESA_SHADER_COMPUTE
:
2940 assert(!"Unexpected shader type");
2944 /* Check if index was set for the uniform instead of the function */
2945 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
2946 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
2947 "used with subroutine functions");
2951 unsigned qual_index
;
2952 if (qual
->flags
.q
.explicit_index
&&
2953 process_qualifier_constant(state
, loc
, "index", qual
->index
,
2955 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2956 * Layout Qualifiers):
2958 * "It is also a compile-time error if a fragment shader
2959 * sets a layout index to less than 0 or greater than 1."
2961 * Older specifications don't mandate a behavior; we take
2962 * this as a clarification and always generate the error.
2964 if (qual_index
> 1) {
2965 _mesa_glsl_error(loc
, state
,
2966 "explicit index may only be 0 or 1");
2968 var
->data
.explicit_index
= true;
2969 var
->data
.index
= qual_index
;
2976 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2978 struct _mesa_glsl_parse_state
*state
,
2981 const glsl_type
*base_type
= var
->type
->without_array();
2983 if (base_type
->is_image()) {
2984 if (var
->data
.mode
!= ir_var_uniform
&&
2985 var
->data
.mode
!= ir_var_function_in
) {
2986 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2987 "function parameters or uniform-qualified "
2988 "global variables");
2991 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2992 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2993 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2994 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2995 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2996 var
->data
.read_only
= true;
2998 if (qual
->flags
.q
.explicit_image_format
) {
2999 if (var
->data
.mode
== ir_var_function_in
) {
3000 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
3001 "used on image function parameters");
3004 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3005 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
3006 "base data type of the image");
3009 var
->data
.image_format
= qual
->image_format
;
3011 if (var
->data
.mode
== ir_var_uniform
) {
3012 if (state
->es_shader
) {
3013 _mesa_glsl_error(loc
, state
, "all image uniforms "
3014 "must have a format layout qualifier");
3016 } else if (!qual
->flags
.q
.write_only
) {
3017 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3018 "`writeonly' must have a format layout "
3023 var
->data
.image_format
= GL_NONE
;
3026 /* From page 70 of the GLSL ES 3.1 specification:
3028 * "Except for image variables qualified with the format qualifiers
3029 * r32f, r32i, and r32ui, image variables must specify either memory
3030 * qualifier readonly or the memory qualifier writeonly."
3032 if (state
->es_shader
&&
3033 var
->data
.image_format
!= GL_R32F
&&
3034 var
->data
.image_format
!= GL_R32I
&&
3035 var
->data
.image_format
!= GL_R32UI
&&
3036 !var
->data
.image_read_only
&&
3037 !var
->data
.image_write_only
) {
3038 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3039 "r32f, r32i or r32ui must be qualified `readonly' or "
3043 } else if (qual
->flags
.q
.read_only
||
3044 qual
->flags
.q
.write_only
||
3045 qual
->flags
.q
.coherent
||
3046 qual
->flags
.q
._volatile
||
3047 qual
->flags
.q
.restrict_flag
||
3048 qual
->flags
.q
.explicit_image_format
) {
3049 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3054 static inline const char*
3055 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3057 if (origin_upper_left
&& pixel_center_integer
)
3058 return "origin_upper_left, pixel_center_integer";
3059 else if (origin_upper_left
)
3060 return "origin_upper_left";
3061 else if (pixel_center_integer
)
3062 return "pixel_center_integer";
3068 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3069 const struct ast_type_qualifier
*qual
)
3071 /* If gl_FragCoord was previously declared, and the qualifiers were
3072 * different in any way, return true.
3074 if (state
->fs_redeclares_gl_fragcoord
) {
3075 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3076 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3083 validate_array_dimensions(const glsl_type
*t
,
3084 struct _mesa_glsl_parse_state
*state
,
3086 if (t
->is_array()) {
3087 t
= t
->fields
.array
;
3088 while (t
->is_array()) {
3089 if (t
->is_unsized_array()) {
3090 _mesa_glsl_error(loc
, state
,
3091 "only the outermost array dimension can "
3096 t
= t
->fields
.array
;
3102 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3104 struct _mesa_glsl_parse_state
*state
,
3107 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3109 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3111 * "Within any shader, the first redeclarations of gl_FragCoord
3112 * must appear before any use of gl_FragCoord."
3114 * Generate a compiler error if above condition is not met by the
3117 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3118 if (earlier
!= NULL
&&
3119 earlier
->data
.used
&&
3120 !state
->fs_redeclares_gl_fragcoord
) {
3121 _mesa_glsl_error(loc
, state
,
3122 "gl_FragCoord used before its first redeclaration "
3123 "in fragment shader");
3126 /* Make sure all gl_FragCoord redeclarations specify the same layout
3129 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3130 const char *const qual_string
=
3131 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3132 qual
->flags
.q
.pixel_center_integer
);
3134 const char *const state_string
=
3135 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3136 state
->fs_pixel_center_integer
);
3138 _mesa_glsl_error(loc
, state
,
3139 "gl_FragCoord redeclared with different layout "
3140 "qualifiers (%s) and (%s) ",
3144 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3145 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3146 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3147 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3148 state
->fs_redeclares_gl_fragcoord
=
3149 state
->fs_origin_upper_left
||
3150 state
->fs_pixel_center_integer
||
3151 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3154 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3155 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3156 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3157 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3158 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3159 ? "origin_upper_left" : "pixel_center_integer";
3161 _mesa_glsl_error(loc
, state
,
3162 "layout qualifier `%s' can only be applied to "
3163 "fragment shader input `gl_FragCoord'",
3167 if (qual
->flags
.q
.explicit_location
) {
3168 apply_explicit_location(qual
, var
, state
, loc
);
3169 } else if (qual
->flags
.q
.explicit_index
) {
3170 if (!qual
->flags
.q
.subroutine_def
)
3171 _mesa_glsl_error(loc
, state
,
3172 "explicit index requires explicit location");
3175 if (qual
->flags
.q
.explicit_binding
) {
3176 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3179 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3180 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3181 unsigned qual_stream
;
3182 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3184 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3185 var
->data
.stream
= qual_stream
;
3189 if (var
->type
->contains_atomic()) {
3190 if (var
->data
.mode
== ir_var_uniform
) {
3191 if (var
->data
.explicit_binding
) {
3193 &state
->atomic_counter_offsets
[var
->data
.binding
];
3195 if (*offset
% ATOMIC_COUNTER_SIZE
)
3196 _mesa_glsl_error(loc
, state
,
3197 "misaligned atomic counter offset");
3199 var
->data
.offset
= *offset
;
3200 *offset
+= var
->type
->atomic_size();
3203 _mesa_glsl_error(loc
, state
,
3204 "atomic counters require explicit binding point");
3206 } else if (var
->data
.mode
!= ir_var_function_in
) {
3207 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3208 "function parameters or uniform-qualified "
3209 "global variables");
3213 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3214 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3215 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3216 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3217 * These extensions and all following extensions that add the 'layout'
3218 * keyword have been modified to require the use of 'in' or 'out'.
3220 * The following extension do not allow the deprecated keywords:
3222 * GL_AMD_conservative_depth
3223 * GL_ARB_conservative_depth
3224 * GL_ARB_gpu_shader5
3225 * GL_ARB_separate_shader_objects
3226 * GL_ARB_tessellation_shader
3227 * GL_ARB_transform_feedback3
3228 * GL_ARB_uniform_buffer_object
3230 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3231 * allow layout with the deprecated keywords.
3233 const bool relaxed_layout_qualifier_checking
=
3234 state
->ARB_fragment_coord_conventions_enable
;
3236 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3237 || qual
->flags
.q
.varying
;
3238 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3239 if (relaxed_layout_qualifier_checking
) {
3240 _mesa_glsl_warning(loc
, state
,
3241 "`layout' qualifier may not be used with "
3242 "`attribute' or `varying'");
3244 _mesa_glsl_error(loc
, state
,
3245 "`layout' qualifier may not be used with "
3246 "`attribute' or `varying'");
3250 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3251 * AMD_conservative_depth.
3253 int depth_layout_count
= qual
->flags
.q
.depth_any
3254 + qual
->flags
.q
.depth_greater
3255 + qual
->flags
.q
.depth_less
3256 + qual
->flags
.q
.depth_unchanged
;
3257 if (depth_layout_count
> 0
3258 && !state
->AMD_conservative_depth_enable
3259 && !state
->ARB_conservative_depth_enable
) {
3260 _mesa_glsl_error(loc
, state
,
3261 "extension GL_AMD_conservative_depth or "
3262 "GL_ARB_conservative_depth must be enabled "
3263 "to use depth layout qualifiers");
3264 } else if (depth_layout_count
> 0
3265 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3266 _mesa_glsl_error(loc
, state
,
3267 "depth layout qualifiers can be applied only to "
3269 } else if (depth_layout_count
> 1
3270 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3271 _mesa_glsl_error(loc
, state
,
3272 "at most one depth layout qualifier can be applied to "
3275 if (qual
->flags
.q
.depth_any
)
3276 var
->data
.depth_layout
= ir_depth_layout_any
;
3277 else if (qual
->flags
.q
.depth_greater
)
3278 var
->data
.depth_layout
= ir_depth_layout_greater
;
3279 else if (qual
->flags
.q
.depth_less
)
3280 var
->data
.depth_layout
= ir_depth_layout_less
;
3281 else if (qual
->flags
.q
.depth_unchanged
)
3282 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3284 var
->data
.depth_layout
= ir_depth_layout_none
;
3286 if (qual
->flags
.q
.std140
||
3287 qual
->flags
.q
.std430
||
3288 qual
->flags
.q
.packed
||
3289 qual
->flags
.q
.shared
) {
3290 _mesa_glsl_error(loc
, state
,
3291 "uniform and shader storage block layout qualifiers "
3292 "std140, std430, packed, and shared can only be "
3293 "applied to uniform or shader storage blocks, not "
3297 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3298 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3301 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3304 * "Fragment shaders also allow the following layout qualifier on in only
3305 * (not with variable declarations)
3306 * layout-qualifier-id
3307 * early_fragment_tests
3310 if (qual
->flags
.q
.early_fragment_tests
) {
3311 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3312 "valid in fragment shader input layout declaration.");
3317 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3319 struct _mesa_glsl_parse_state
*state
,
3323 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3325 if (qual
->flags
.q
.invariant
) {
3326 if (var
->data
.used
) {
3327 _mesa_glsl_error(loc
, state
,
3328 "variable `%s' may not be redeclared "
3329 "`invariant' after being used",
3332 var
->data
.invariant
= 1;
3336 if (qual
->flags
.q
.precise
) {
3337 if (var
->data
.used
) {
3338 _mesa_glsl_error(loc
, state
,
3339 "variable `%s' may not be redeclared "
3340 "`precise' after being used",
3343 var
->data
.precise
= 1;
3347 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3348 _mesa_glsl_error(loc
, state
,
3349 "`subroutine' may only be applied to uniforms, "
3350 "subroutine type declarations, or function definitions");
3353 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3354 || qual
->flags
.q
.uniform
3355 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3356 var
->data
.read_only
= 1;
3358 if (qual
->flags
.q
.centroid
)
3359 var
->data
.centroid
= 1;
3361 if (qual
->flags
.q
.sample
)
3362 var
->data
.sample
= 1;
3364 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3365 if (state
->es_shader
) {
3366 var
->data
.precision
=
3367 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3370 if (qual
->flags
.q
.patch
)
3371 var
->data
.patch
= 1;
3373 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3374 var
->type
= glsl_type::error_type
;
3375 _mesa_glsl_error(loc
, state
,
3376 "`attribute' variables may not be declared in the "
3378 _mesa_shader_stage_to_string(state
->stage
));
3381 /* Disallow layout qualifiers which may only appear on layout declarations. */
3382 if (qual
->flags
.q
.prim_type
) {
3383 _mesa_glsl_error(loc
, state
,
3384 "Primitive type may only be specified on GS input or output "
3385 "layout declaration, not on variables.");
3388 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3390 * "However, the const qualifier cannot be used with out or inout."
3392 * The same section of the GLSL 4.40 spec further clarifies this saying:
3394 * "The const qualifier cannot be used with out or inout, or a
3395 * compile-time error results."
3397 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3398 _mesa_glsl_error(loc
, state
,
3399 "`const' may not be applied to `out' or `inout' "
3400 "function parameters");
3403 /* If there is no qualifier that changes the mode of the variable, leave
3404 * the setting alone.
3406 assert(var
->data
.mode
!= ir_var_temporary
);
3407 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3408 var
->data
.mode
= ir_var_function_inout
;
3409 else if (qual
->flags
.q
.in
)
3410 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3411 else if (qual
->flags
.q
.attribute
3412 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3413 var
->data
.mode
= ir_var_shader_in
;
3414 else if (qual
->flags
.q
.out
)
3415 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3416 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3417 var
->data
.mode
= ir_var_shader_out
;
3418 else if (qual
->flags
.q
.uniform
)
3419 var
->data
.mode
= ir_var_uniform
;
3420 else if (qual
->flags
.q
.buffer
)
3421 var
->data
.mode
= ir_var_shader_storage
;
3422 else if (qual
->flags
.q
.shared_storage
)
3423 var
->data
.mode
= ir_var_shader_shared
;
3425 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3426 /* User-defined ins/outs are not permitted in compute shaders. */
3427 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3428 _mesa_glsl_error(loc
, state
,
3429 "user-defined input and output variables are not "
3430 "permitted in compute shaders");
3433 /* This variable is being used to link data between shader stages (in
3434 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3435 * that is allowed for such purposes.
3437 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3439 * "The varying qualifier can be used only with the data types
3440 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3443 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3444 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3446 * "Fragment inputs can only be signed and unsigned integers and
3447 * integer vectors, float, floating-point vectors, matrices, or
3448 * arrays of these. Structures cannot be input.
3450 * Similar text exists in the section on vertex shader outputs.
3452 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3453 * 3.00 spec allows structs as well. Varying structs are also allowed
3456 switch (var
->type
->get_scalar_type()->base_type
) {
3457 case GLSL_TYPE_FLOAT
:
3458 /* Ok in all GLSL versions */
3460 case GLSL_TYPE_UINT
:
3462 if (state
->is_version(130, 300))
3464 _mesa_glsl_error(loc
, state
,
3465 "varying variables must be of base type float in %s",
3466 state
->get_version_string());
3468 case GLSL_TYPE_STRUCT
:
3469 if (state
->is_version(150, 300))
3471 _mesa_glsl_error(loc
, state
,
3472 "varying variables may not be of type struct");
3474 case GLSL_TYPE_DOUBLE
:
3477 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3482 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3483 switch (state
->stage
) {
3484 case MESA_SHADER_VERTEX
:
3485 if (var
->data
.mode
== ir_var_shader_out
)
3486 var
->data
.invariant
= true;
3488 case MESA_SHADER_TESS_CTRL
:
3489 case MESA_SHADER_TESS_EVAL
:
3490 case MESA_SHADER_GEOMETRY
:
3491 if ((var
->data
.mode
== ir_var_shader_in
)
3492 || (var
->data
.mode
== ir_var_shader_out
))
3493 var
->data
.invariant
= true;
3495 case MESA_SHADER_FRAGMENT
:
3496 if (var
->data
.mode
== ir_var_shader_in
)
3497 var
->data
.invariant
= true;
3499 case MESA_SHADER_COMPUTE
:
3500 /* Invariance isn't meaningful in compute shaders. */
3505 var
->data
.interpolation
=
3506 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
3509 /* Does the declaration use the deprecated 'attribute' or 'varying'
3512 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3513 || qual
->flags
.q
.varying
;
3516 /* Validate auxiliary storage qualifiers */
3518 /* From section 4.3.4 of the GLSL 1.30 spec:
3519 * "It is an error to use centroid in in a vertex shader."
3521 * From section 4.3.4 of the GLSL ES 3.00 spec:
3522 * "It is an error to use centroid in or interpolation qualifiers in
3523 * a vertex shader input."
3526 /* Section 4.3.6 of the GLSL 1.30 specification states:
3527 * "It is an error to use centroid out in a fragment shader."
3529 * The GL_ARB_shading_language_420pack extension specification states:
3530 * "It is an error to use auxiliary storage qualifiers or interpolation
3531 * qualifiers on an output in a fragment shader."
3533 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3534 _mesa_glsl_error(loc
, state
,
3535 "sample qualifier may only be used on `in` or `out` "
3536 "variables between shader stages");
3538 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3539 _mesa_glsl_error(loc
, state
,
3540 "centroid qualifier may only be used with `in', "
3541 "`out' or `varying' variables between shader stages");
3544 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3545 _mesa_glsl_error(loc
, state
,
3546 "the shared storage qualifiers can only be used with "
3550 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3554 * Get the variable that is being redeclared by this declaration
3556 * Semantic checks to verify the validity of the redeclaration are also
3557 * performed. If semantic checks fail, compilation error will be emitted via
3558 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3561 * A pointer to an existing variable in the current scope if the declaration
3562 * is a redeclaration, \c NULL otherwise.
3564 static ir_variable
*
3565 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3566 struct _mesa_glsl_parse_state
*state
,
3567 bool allow_all_redeclarations
)
3569 /* Check if this declaration is actually a re-declaration, either to
3570 * resize an array or add qualifiers to an existing variable.
3572 * This is allowed for variables in the current scope, or when at
3573 * global scope (for built-ins in the implicit outer scope).
3575 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3576 if (earlier
== NULL
||
3577 (state
->current_function
!= NULL
&&
3578 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3583 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3585 * "It is legal to declare an array without a size and then
3586 * later re-declare the same name as an array of the same
3587 * type and specify a size."
3589 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3590 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3591 /* FINISHME: This doesn't match the qualifiers on the two
3592 * FINISHME: declarations. It's not 100% clear whether this is
3593 * FINISHME: required or not.
3596 const unsigned size
= unsigned(var
->type
->array_size());
3597 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3598 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3599 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3601 earlier
->data
.max_array_access
);
3604 earlier
->type
= var
->type
;
3607 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3608 state
->is_version(150, 0))
3609 && strcmp(var
->name
, "gl_FragCoord") == 0
3610 && earlier
->type
== var
->type
3611 && var
->data
.mode
== ir_var_shader_in
) {
3612 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3615 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3616 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3618 /* According to section 4.3.7 of the GLSL 1.30 spec,
3619 * the following built-in varaibles can be redeclared with an
3620 * interpolation qualifier:
3623 * * gl_FrontSecondaryColor
3624 * * gl_BackSecondaryColor
3626 * * gl_SecondaryColor
3628 } else if (state
->is_version(130, 0)
3629 && (strcmp(var
->name
, "gl_FrontColor") == 0
3630 || strcmp(var
->name
, "gl_BackColor") == 0
3631 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3632 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3633 || strcmp(var
->name
, "gl_Color") == 0
3634 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3635 && earlier
->type
== var
->type
3636 && earlier
->data
.mode
== var
->data
.mode
) {
3637 earlier
->data
.interpolation
= var
->data
.interpolation
;
3639 /* Layout qualifiers for gl_FragDepth. */
3640 } else if ((state
->AMD_conservative_depth_enable
||
3641 state
->ARB_conservative_depth_enable
)
3642 && strcmp(var
->name
, "gl_FragDepth") == 0
3643 && earlier
->type
== var
->type
3644 && earlier
->data
.mode
== var
->data
.mode
) {
3646 /** From the AMD_conservative_depth spec:
3647 * Within any shader, the first redeclarations of gl_FragDepth
3648 * must appear before any use of gl_FragDepth.
3650 if (earlier
->data
.used
) {
3651 _mesa_glsl_error(&loc
, state
,
3652 "the first redeclaration of gl_FragDepth "
3653 "must appear before any use of gl_FragDepth");
3656 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3657 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3658 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3659 _mesa_glsl_error(&loc
, state
,
3660 "gl_FragDepth: depth layout is declared here "
3661 "as '%s, but it was previously declared as "
3663 depth_layout_string(var
->data
.depth_layout
),
3664 depth_layout_string(earlier
->data
.depth_layout
));
3667 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3669 } else if (allow_all_redeclarations
) {
3670 if (earlier
->data
.mode
!= var
->data
.mode
) {
3671 _mesa_glsl_error(&loc
, state
,
3672 "redeclaration of `%s' with incorrect qualifiers",
3674 } else if (earlier
->type
!= var
->type
) {
3675 _mesa_glsl_error(&loc
, state
,
3676 "redeclaration of `%s' has incorrect type",
3680 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3687 * Generate the IR for an initializer in a variable declaration
3690 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3691 ast_fully_specified_type
*type
,
3692 exec_list
*initializer_instructions
,
3693 struct _mesa_glsl_parse_state
*state
)
3695 ir_rvalue
*result
= NULL
;
3697 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3699 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3701 * "All uniform variables are read-only and are initialized either
3702 * directly by an application via API commands, or indirectly by
3705 if (var
->data
.mode
== ir_var_uniform
) {
3706 state
->check_version(120, 0, &initializer_loc
,
3707 "cannot initialize uniform %s",
3711 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3713 * "Buffer variables cannot have initializers."
3715 if (var
->data
.mode
== ir_var_shader_storage
) {
3716 _mesa_glsl_error(&initializer_loc
, state
,
3717 "cannot initialize buffer variable %s",
3721 /* From section 4.1.7 of the GLSL 4.40 spec:
3723 * "Opaque variables [...] are initialized only through the
3724 * OpenGL API; they cannot be declared with an initializer in a
3727 if (var
->type
->contains_opaque()) {
3728 _mesa_glsl_error(&initializer_loc
, state
,
3729 "cannot initialize opaque variable %s",
3733 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3734 _mesa_glsl_error(&initializer_loc
, state
,
3735 "cannot initialize %s shader input / %s %s",
3736 _mesa_shader_stage_to_string(state
->stage
),
3737 (state
->stage
== MESA_SHADER_VERTEX
)
3738 ? "attribute" : "varying",
3742 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3743 _mesa_glsl_error(&initializer_loc
, state
,
3744 "cannot initialize %s shader output %s",
3745 _mesa_shader_stage_to_string(state
->stage
),
3749 /* If the initializer is an ast_aggregate_initializer, recursively store
3750 * type information from the LHS into it, so that its hir() function can do
3753 if (decl
->initializer
->oper
== ast_aggregate
)
3754 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3756 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3757 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3759 /* Calculate the constant value if this is a const or uniform
3762 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
3764 * "Declarations of globals without a storage qualifier, or with
3765 * just the const qualifier, may include initializers, in which case
3766 * they will be initialized before the first line of main() is
3767 * executed. Such initializers must be a constant expression."
3769 * The same section of the GLSL ES 3.00.4 spec has similar language.
3771 if (type
->qualifier
.flags
.q
.constant
3772 || type
->qualifier
.flags
.q
.uniform
3773 || (state
->es_shader
&& state
->current_function
== NULL
)) {
3774 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3776 if (new_rhs
!= NULL
) {
3779 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
3782 * "A constant expression is one of
3786 * - an expression formed by an operator on operands that are
3787 * all constant expressions, including getting an element of
3788 * a constant array, or a field of a constant structure, or
3789 * components of a constant vector. However, the sequence
3790 * operator ( , ) and the assignment operators ( =, +=, ...)
3791 * are not included in the operators that can create a
3792 * constant expression."
3794 * Section 12.43 (Sequence operator and constant expressions) says:
3796 * "Should the following construct be allowed?
3800 * The expression within the brackets uses the sequence operator
3801 * (',') and returns the integer 3 so the construct is declaring
3802 * a single-dimensional array of size 3. In some languages, the
3803 * construct declares a two-dimensional array. It would be
3804 * preferable to make this construct illegal to avoid confusion.
3806 * One possibility is to change the definition of the sequence
3807 * operator so that it does not return a constant-expression and
3808 * hence cannot be used to declare an array size.
3810 * RESOLUTION: The result of a sequence operator is not a
3811 * constant-expression."
3813 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
3814 * contains language almost identical to the section 4.3.3 in the
3815 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
3818 ir_constant
*constant_value
= rhs
->constant_expression_value();
3819 if (!constant_value
||
3820 (state
->is_version(430, 300) &&
3821 decl
->initializer
->has_sequence_subexpression())) {
3822 const char *const variable_mode
=
3823 (type
->qualifier
.flags
.q
.constant
)
3825 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
3827 /* If ARB_shading_language_420pack is enabled, initializers of
3828 * const-qualified local variables do not have to be constant
3829 * expressions. Const-qualified global variables must still be
3830 * initialized with constant expressions.
3832 if (!state
->has_420pack()
3833 || state
->current_function
== NULL
) {
3834 _mesa_glsl_error(& initializer_loc
, state
,
3835 "initializer of %s variable `%s' must be a "
3836 "constant expression",
3839 if (var
->type
->is_numeric()) {
3840 /* Reduce cascading errors. */
3841 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3842 ? ir_constant::zero(state
, var
->type
) : NULL
;
3846 rhs
= constant_value
;
3847 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3848 ? constant_value
: NULL
;
3851 if (var
->type
->is_numeric()) {
3852 /* Reduce cascading errors. */
3853 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3854 ? ir_constant::zero(state
, var
->type
) : NULL
;
3859 if (rhs
&& !rhs
->type
->is_error()) {
3860 bool temp
= var
->data
.read_only
;
3861 if (type
->qualifier
.flags
.q
.constant
)
3862 var
->data
.read_only
= false;
3864 /* Never emit code to initialize a uniform.
3866 const glsl_type
*initializer_type
;
3867 if (!type
->qualifier
.flags
.q
.uniform
) {
3868 do_assignment(initializer_instructions
, state
,
3873 type
->get_location());
3874 initializer_type
= result
->type
;
3876 initializer_type
= rhs
->type
;
3878 var
->constant_initializer
= rhs
->constant_expression_value();
3879 var
->data
.has_initializer
= true;
3881 /* If the declared variable is an unsized array, it must inherrit
3882 * its full type from the initializer. A declaration such as
3884 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3888 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3890 * The assignment generated in the if-statement (below) will also
3891 * automatically handle this case for non-uniforms.
3893 * If the declared variable is not an array, the types must
3894 * already match exactly. As a result, the type assignment
3895 * here can be done unconditionally. For non-uniforms the call
3896 * to do_assignment can change the type of the initializer (via
3897 * the implicit conversion rules). For uniforms the initializer
3898 * must be a constant expression, and the type of that expression
3899 * was validated above.
3901 var
->type
= initializer_type
;
3903 var
->data
.read_only
= temp
;
3910 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3911 YYLTYPE loc
, ir_variable
*var
,
3912 unsigned num_vertices
,
3914 const char *var_category
)
3916 if (var
->type
->is_unsized_array()) {
3917 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3919 * All geometry shader input unsized array declarations will be
3920 * sized by an earlier input layout qualifier, when present, as per
3921 * the following table.
3923 * Followed by a table mapping each allowed input layout qualifier to
3924 * the corresponding input length.
3926 * Similarly for tessellation control shader outputs.
3928 if (num_vertices
!= 0)
3929 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3932 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3933 * includes the following examples of compile-time errors:
3935 * // code sequence within one shader...
3936 * in vec4 Color1[]; // size unknown
3937 * ...Color1.length()...// illegal, length() unknown
3938 * in vec4 Color2[2]; // size is 2
3939 * ...Color1.length()...// illegal, Color1 still has no size
3940 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3941 * layout(lines) in; // legal, input size is 2, matching
3942 * in vec4 Color4[3]; // illegal, contradicts layout
3945 * To detect the case illustrated by Color3, we verify that the size of
3946 * an explicitly-sized array matches the size of any previously declared
3947 * explicitly-sized array. To detect the case illustrated by Color4, we
3948 * verify that the size of an explicitly-sized array is consistent with
3949 * any previously declared input layout.
3951 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3952 _mesa_glsl_error(&loc
, state
,
3953 "%s size contradicts previously declared layout "
3954 "(size is %u, but layout requires a size of %u)",
3955 var_category
, var
->type
->length
, num_vertices
);
3956 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3957 _mesa_glsl_error(&loc
, state
,
3958 "%s sizes are inconsistent (size is %u, but a "
3959 "previous declaration has size %u)",
3960 var_category
, var
->type
->length
, *size
);
3962 *size
= var
->type
->length
;
3968 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3969 YYLTYPE loc
, ir_variable
*var
)
3971 unsigned num_vertices
= 0;
3973 if (state
->tcs_output_vertices_specified
) {
3974 if (!state
->out_qualifier
->vertices
->
3975 process_qualifier_constant(state
, "vertices",
3976 &num_vertices
, false)) {
3980 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
3981 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
3982 "GL_MAX_PATCH_VERTICES", num_vertices
);
3987 if (!var
->type
->is_array() && !var
->data
.patch
) {
3988 _mesa_glsl_error(&loc
, state
,
3989 "tessellation control shader outputs must be arrays");
3991 /* To avoid cascading failures, short circuit the checks below. */
3995 if (var
->data
.patch
)
3998 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3999 &state
->tcs_output_size
,
4000 "tessellation control shader output");
4004 * Do additional processing necessary for tessellation control/evaluation shader
4005 * input declarations. This covers both interface block arrays and bare input
4009 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4010 YYLTYPE loc
, ir_variable
*var
)
4012 if (!var
->type
->is_array() && !var
->data
.patch
) {
4013 _mesa_glsl_error(&loc
, state
,
4014 "per-vertex tessellation shader inputs must be arrays");
4015 /* Avoid cascading failures. */
4019 if (var
->data
.patch
)
4022 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
4023 if (var
->type
->is_unsized_array()) {
4024 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4025 state
->Const
.MaxPatchVertices
);
4031 * Do additional processing necessary for geometry shader input declarations
4032 * (this covers both interface blocks arrays and bare input variables).
4035 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4036 YYLTYPE loc
, ir_variable
*var
)
4038 unsigned num_vertices
= 0;
4040 if (state
->gs_input_prim_type_specified
) {
4041 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4044 /* Geometry shader input variables must be arrays. Caller should have
4045 * reported an error for this.
4047 if (!var
->type
->is_array()) {
4048 assert(state
->error
);
4050 /* To avoid cascading failures, short circuit the checks below. */
4054 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4055 &state
->gs_input_size
,
4056 "geometry shader input");
4060 validate_identifier(const char *identifier
, YYLTYPE loc
,
4061 struct _mesa_glsl_parse_state
*state
)
4063 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4065 * "Identifiers starting with "gl_" are reserved for use by
4066 * OpenGL, and may not be declared in a shader as either a
4067 * variable or a function."
4069 if (is_gl_identifier(identifier
)) {
4070 _mesa_glsl_error(&loc
, state
,
4071 "identifier `%s' uses reserved `gl_' prefix",
4073 } else if (strstr(identifier
, "__")) {
4074 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4077 * "In addition, all identifiers containing two
4078 * consecutive underscores (__) are reserved as
4079 * possible future keywords."
4081 * The intention is that names containing __ are reserved for internal
4082 * use by the implementation, and names prefixed with GL_ are reserved
4083 * for use by Khronos. Names simply containing __ are dangerous to use,
4084 * but should be allowed.
4086 * A future version of the GLSL specification will clarify this.
4088 _mesa_glsl_warning(&loc
, state
,
4089 "identifier `%s' uses reserved `__' string",
4095 ast_declarator_list::hir(exec_list
*instructions
,
4096 struct _mesa_glsl_parse_state
*state
)
4099 const struct glsl_type
*decl_type
;
4100 const char *type_name
= NULL
;
4101 ir_rvalue
*result
= NULL
;
4102 YYLTYPE loc
= this->get_location();
4104 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4106 * "To ensure that a particular output variable is invariant, it is
4107 * necessary to use the invariant qualifier. It can either be used to
4108 * qualify a previously declared variable as being invariant
4110 * invariant gl_Position; // make existing gl_Position be invariant"
4112 * In these cases the parser will set the 'invariant' flag in the declarator
4113 * list, and the type will be NULL.
4115 if (this->invariant
) {
4116 assert(this->type
== NULL
);
4118 if (state
->current_function
!= NULL
) {
4119 _mesa_glsl_error(& loc
, state
,
4120 "all uses of `invariant' keyword must be at global "
4124 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4125 assert(decl
->array_specifier
== NULL
);
4126 assert(decl
->initializer
== NULL
);
4128 ir_variable
*const earlier
=
4129 state
->symbols
->get_variable(decl
->identifier
);
4130 if (earlier
== NULL
) {
4131 _mesa_glsl_error(& loc
, state
,
4132 "undeclared variable `%s' cannot be marked "
4133 "invariant", decl
->identifier
);
4134 } else if (!is_varying_var(earlier
, state
->stage
)) {
4135 _mesa_glsl_error(&loc
, state
,
4136 "`%s' cannot be marked invariant; interfaces between "
4137 "shader stages only.", decl
->identifier
);
4138 } else if (earlier
->data
.used
) {
4139 _mesa_glsl_error(& loc
, state
,
4140 "variable `%s' may not be redeclared "
4141 "`invariant' after being used",
4144 earlier
->data
.invariant
= true;
4148 /* Invariant redeclarations do not have r-values.
4153 if (this->precise
) {
4154 assert(this->type
== NULL
);
4156 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4157 assert(decl
->array_specifier
== NULL
);
4158 assert(decl
->initializer
== NULL
);
4160 ir_variable
*const earlier
=
4161 state
->symbols
->get_variable(decl
->identifier
);
4162 if (earlier
== NULL
) {
4163 _mesa_glsl_error(& loc
, state
,
4164 "undeclared variable `%s' cannot be marked "
4165 "precise", decl
->identifier
);
4166 } else if (state
->current_function
!= NULL
&&
4167 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4168 /* Note: we have to check if we're in a function, since
4169 * builtins are treated as having come from another scope.
4171 _mesa_glsl_error(& loc
, state
,
4172 "variable `%s' from an outer scope may not be "
4173 "redeclared `precise' in this scope",
4175 } else if (earlier
->data
.used
) {
4176 _mesa_glsl_error(& loc
, state
,
4177 "variable `%s' may not be redeclared "
4178 "`precise' after being used",
4181 earlier
->data
.precise
= true;
4185 /* Precise redeclarations do not have r-values either. */
4189 assert(this->type
!= NULL
);
4190 assert(!this->invariant
);
4191 assert(!this->precise
);
4193 /* The type specifier may contain a structure definition. Process that
4194 * before any of the variable declarations.
4196 (void) this->type
->specifier
->hir(instructions
, state
);
4198 decl_type
= this->type
->glsl_type(& type_name
, state
);
4200 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4201 * "Buffer variables may only be declared inside interface blocks
4202 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4203 * shader storage blocks. It is a compile-time error to declare buffer
4204 * variables at global scope (outside a block)."
4206 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4207 _mesa_glsl_error(&loc
, state
,
4208 "buffer variables cannot be declared outside "
4209 "interface blocks");
4212 /* An offset-qualified atomic counter declaration sets the default
4213 * offset for the next declaration within the same atomic counter
4216 if (decl_type
&& decl_type
->contains_atomic()) {
4217 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4218 type
->qualifier
.flags
.q
.explicit_offset
) {
4219 unsigned qual_binding
;
4220 unsigned qual_offset
;
4221 if (process_qualifier_constant(state
, &loc
, "binding",
4222 type
->qualifier
.binding
,
4224 && process_qualifier_constant(state
, &loc
, "offset",
4225 type
->qualifier
.offset
,
4227 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4232 if (this->declarations
.is_empty()) {
4233 /* If there is no structure involved in the program text, there are two
4234 * possible scenarios:
4236 * - The program text contained something like 'vec4;'. This is an
4237 * empty declaration. It is valid but weird. Emit a warning.
4239 * - The program text contained something like 'S;' and 'S' is not the
4240 * name of a known structure type. This is both invalid and weird.
4243 * - The program text contained something like 'mediump float;'
4244 * when the programmer probably meant 'precision mediump
4245 * float;' Emit a warning with a description of what they
4246 * probably meant to do.
4248 * Note that if decl_type is NULL and there is a structure involved,
4249 * there must have been some sort of error with the structure. In this
4250 * case we assume that an error was already generated on this line of
4251 * code for the structure. There is no need to generate an additional,
4254 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4257 if (decl_type
== NULL
) {
4258 _mesa_glsl_error(&loc
, state
,
4259 "invalid type `%s' in empty declaration",
4262 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4263 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4266 * "... any declaration that leaves the size undefined is
4267 * disallowed as this would add complexity and there are no
4270 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4271 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4272 "or implicitly defined");
4275 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4277 * "The combinations of types and qualifiers that cause
4278 * compile-time or link-time errors are the same whether or not
4279 * the declaration is empty."
4281 validate_array_dimensions(decl_type
, state
, &loc
);
4284 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4285 /* Empty atomic counter declarations are allowed and useful
4286 * to set the default offset qualifier.
4289 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4290 if (this->type
->specifier
->structure
!= NULL
) {
4291 _mesa_glsl_error(&loc
, state
,
4292 "precision qualifiers can't be applied "
4295 static const char *const precision_names
[] = {
4302 _mesa_glsl_warning(&loc
, state
,
4303 "empty declaration with precision "
4304 "qualifier, to set the default precision, "
4305 "use `precision %s %s;'",
4306 precision_names
[this->type
->
4307 qualifier
.precision
],
4310 } else if (this->type
->specifier
->structure
== NULL
) {
4311 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4316 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4317 const struct glsl_type
*var_type
;
4319 const char *identifier
= decl
->identifier
;
4320 /* FINISHME: Emit a warning if a variable declaration shadows a
4321 * FINISHME: declaration at a higher scope.
4324 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4325 if (type_name
!= NULL
) {
4326 _mesa_glsl_error(& loc
, state
,
4327 "invalid type `%s' in declaration of `%s'",
4328 type_name
, decl
->identifier
);
4330 _mesa_glsl_error(& loc
, state
,
4331 "invalid type in declaration of `%s'",
4337 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4341 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4343 _mesa_glsl_error(& loc
, state
,
4344 "invalid type in declaration of `%s'",
4346 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4351 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4354 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4356 /* The 'varying in' and 'varying out' qualifiers can only be used with
4357 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4360 if (this->type
->qualifier
.flags
.q
.varying
) {
4361 if (this->type
->qualifier
.flags
.q
.in
) {
4362 _mesa_glsl_error(& loc
, state
,
4363 "`varying in' qualifier in declaration of "
4364 "`%s' only valid for geometry shaders using "
4365 "ARB_geometry_shader4 or EXT_geometry_shader4",
4367 } else if (this->type
->qualifier
.flags
.q
.out
) {
4368 _mesa_glsl_error(& loc
, state
,
4369 "`varying out' qualifier in declaration of "
4370 "`%s' only valid for geometry shaders using "
4371 "ARB_geometry_shader4 or EXT_geometry_shader4",
4376 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4378 * "Global variables can only use the qualifiers const,
4379 * attribute, uniform, or varying. Only one may be
4382 * Local variables can only use the qualifier const."
4384 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4385 * any extension that adds the 'layout' keyword.
4387 if (!state
->is_version(130, 300)
4388 && !state
->has_explicit_attrib_location()
4389 && !state
->has_separate_shader_objects()
4390 && !state
->ARB_fragment_coord_conventions_enable
) {
4391 if (this->type
->qualifier
.flags
.q
.out
) {
4392 _mesa_glsl_error(& loc
, state
,
4393 "`out' qualifier in declaration of `%s' "
4394 "only valid for function parameters in %s",
4395 decl
->identifier
, state
->get_version_string());
4397 if (this->type
->qualifier
.flags
.q
.in
) {
4398 _mesa_glsl_error(& loc
, state
,
4399 "`in' qualifier in declaration of `%s' "
4400 "only valid for function parameters in %s",
4401 decl
->identifier
, state
->get_version_string());
4403 /* FINISHME: Test for other invalid qualifiers. */
4406 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4408 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4411 if (this->type
->qualifier
.flags
.q
.invariant
) {
4412 if (!is_varying_var(var
, state
->stage
)) {
4413 _mesa_glsl_error(&loc
, state
,
4414 "`%s' cannot be marked invariant; interfaces between "
4415 "shader stages only", var
->name
);
4419 if (state
->current_function
!= NULL
) {
4420 const char *mode
= NULL
;
4421 const char *extra
= "";
4423 /* There is no need to check for 'inout' here because the parser will
4424 * only allow that in function parameter lists.
4426 if (this->type
->qualifier
.flags
.q
.attribute
) {
4428 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4429 mode
= "subroutine uniform";
4430 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4432 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4434 } else if (this->type
->qualifier
.flags
.q
.in
) {
4436 extra
= " or in function parameter list";
4437 } else if (this->type
->qualifier
.flags
.q
.out
) {
4439 extra
= " or in function parameter list";
4443 _mesa_glsl_error(& loc
, state
,
4444 "%s variable `%s' must be declared at "
4446 mode
, var
->name
, extra
);
4448 } else if (var
->data
.mode
== ir_var_shader_in
) {
4449 var
->data
.read_only
= true;
4451 if (state
->stage
== MESA_SHADER_VERTEX
) {
4452 bool error_emitted
= false;
4454 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4456 * "Vertex shader inputs can only be float, floating-point
4457 * vectors, matrices, signed and unsigned integers and integer
4458 * vectors. Vertex shader inputs can also form arrays of these
4459 * types, but not structures."
4461 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4463 * "Vertex shader inputs can only be float, floating-point
4464 * vectors, matrices, signed and unsigned integers and integer
4465 * vectors. They cannot be arrays or structures."
4467 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4469 * "The attribute qualifier can be used only with float,
4470 * floating-point vectors, and matrices. Attribute variables
4471 * cannot be declared as arrays or structures."
4473 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4475 * "Vertex shader inputs can only be float, floating-point
4476 * vectors, matrices, signed and unsigned integers and integer
4477 * vectors. Vertex shader inputs cannot be arrays or
4480 const glsl_type
*check_type
= var
->type
->without_array();
4482 switch (check_type
->base_type
) {
4483 case GLSL_TYPE_FLOAT
:
4485 case GLSL_TYPE_UINT
:
4487 if (state
->is_version(120, 300))
4489 case GLSL_TYPE_DOUBLE
:
4490 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4494 _mesa_glsl_error(& loc
, state
,
4495 "vertex shader input / attribute cannot have "
4497 var
->type
->is_array() ? "array of " : "",
4499 error_emitted
= true;
4502 if (!error_emitted
&& var
->type
->is_array() &&
4503 !state
->check_version(150, 0, &loc
,
4504 "vertex shader input / attribute "
4505 "cannot have array type")) {
4506 error_emitted
= true;
4508 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4509 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4511 * Geometry shader input variables get the per-vertex values
4512 * written out by vertex shader output variables of the same
4513 * names. Since a geometry shader operates on a set of
4514 * vertices, each input varying variable (or input block, see
4515 * interface blocks below) needs to be declared as an array.
4517 if (!var
->type
->is_array()) {
4518 _mesa_glsl_error(&loc
, state
,
4519 "geometry shader inputs must be arrays");
4522 handle_geometry_shader_input_decl(state
, loc
, var
);
4523 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4524 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4526 * It is a compile-time error to declare a fragment shader
4527 * input with, or that contains, any of the following types:
4531 * * An array of arrays
4532 * * An array of structures
4533 * * A structure containing an array
4534 * * A structure containing a structure
4536 if (state
->es_shader
) {
4537 const glsl_type
*check_type
= var
->type
->without_array();
4538 if (check_type
->is_boolean() ||
4539 check_type
->contains_opaque()) {
4540 _mesa_glsl_error(&loc
, state
,
4541 "fragment shader input cannot have type %s",
4544 if (var
->type
->is_array() &&
4545 var
->type
->fields
.array
->is_array()) {
4546 _mesa_glsl_error(&loc
, state
,
4548 "cannot have an array of arrays",
4549 _mesa_shader_stage_to_string(state
->stage
));
4551 if (var
->type
->is_array() &&
4552 var
->type
->fields
.array
->is_record()) {
4553 _mesa_glsl_error(&loc
, state
,
4554 "fragment shader input "
4555 "cannot have an array of structs");
4557 if (var
->type
->is_record()) {
4558 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4559 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4560 var
->type
->fields
.structure
[i
].type
->is_record())
4561 _mesa_glsl_error(&loc
, state
,
4562 "fragement shader input cannot have "
4563 "a struct that contains an "
4568 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4569 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4570 handle_tess_shader_input_decl(state
, loc
, var
);
4572 } else if (var
->data
.mode
== ir_var_shader_out
) {
4573 const glsl_type
*check_type
= var
->type
->without_array();
4575 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4577 * It is a compile-time error to declare a vertex, tessellation
4578 * evaluation, tessellation control, or geometry shader output
4579 * that contains any of the following:
4581 * * A Boolean type (bool, bvec2 ...)
4584 if (check_type
->is_boolean() || check_type
->contains_opaque())
4585 _mesa_glsl_error(&loc
, state
,
4586 "%s shader output cannot have type %s",
4587 _mesa_shader_stage_to_string(state
->stage
),
4590 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4592 * It is a compile-time error to declare a fragment shader output
4593 * that contains any of the following:
4595 * * A Boolean type (bool, bvec2 ...)
4596 * * A double-precision scalar or vector (double, dvec2 ...)
4601 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4602 if (check_type
->is_record() || check_type
->is_matrix())
4603 _mesa_glsl_error(&loc
, state
,
4604 "fragment shader output "
4605 "cannot have struct or matrix type");
4606 switch (check_type
->base_type
) {
4607 case GLSL_TYPE_UINT
:
4609 case GLSL_TYPE_FLOAT
:
4612 _mesa_glsl_error(&loc
, state
,
4613 "fragment shader output cannot have "
4614 "type %s", check_type
->name
);
4618 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4620 * It is a compile-time error to declare a vertex shader output
4621 * with, or that contains, any of the following types:
4625 * * An array of arrays
4626 * * An array of structures
4627 * * A structure containing an array
4628 * * A structure containing a structure
4630 * It is a compile-time error to declare a fragment shader output
4631 * with, or that contains, any of the following types:
4637 * * An array of array
4639 if (state
->es_shader
) {
4640 if (var
->type
->is_array() &&
4641 var
->type
->fields
.array
->is_array()) {
4642 _mesa_glsl_error(&loc
, state
,
4644 "cannot have an array of arrays",
4645 _mesa_shader_stage_to_string(state
->stage
));
4647 if (state
->stage
== MESA_SHADER_VERTEX
) {
4648 if (var
->type
->is_array() &&
4649 var
->type
->fields
.array
->is_record()) {
4650 _mesa_glsl_error(&loc
, state
,
4651 "vertex shader output "
4652 "cannot have an array of structs");
4654 if (var
->type
->is_record()) {
4655 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4656 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4657 var
->type
->fields
.structure
[i
].type
->is_record())
4658 _mesa_glsl_error(&loc
, state
,
4659 "vertex shader output cannot have a "
4660 "struct that contains an "
4667 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4668 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4670 } else if (var
->type
->contains_subroutine()) {
4671 /* declare subroutine uniforms as hidden */
4672 var
->data
.how_declared
= ir_var_hidden
;
4675 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4676 * so must integer vertex outputs.
4678 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4679 * "Fragment shader inputs that are signed or unsigned integers or
4680 * integer vectors must be qualified with the interpolation qualifier
4683 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4684 * "Fragment shader inputs that are, or contain, signed or unsigned
4685 * integers or integer vectors must be qualified with the
4686 * interpolation qualifier flat."
4688 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4689 * "Vertex shader outputs that are, or contain, signed or unsigned
4690 * integers or integer vectors must be qualified with the
4691 * interpolation qualifier flat."
4693 * Note that prior to GLSL 1.50, this requirement applied to vertex
4694 * outputs rather than fragment inputs. That creates problems in the
4695 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4696 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4697 * apply the restriction to both vertex outputs and fragment inputs.
4699 * Note also that the desktop GLSL specs are missing the text "or
4700 * contain"; this is presumably an oversight, since there is no
4701 * reasonable way to interpolate a fragment shader input that contains
4704 if (state
->is_version(130, 300) &&
4705 var
->type
->contains_integer() &&
4706 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4707 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4708 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4709 && state
->es_shader
))) {
4710 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4711 "vertex output" : "fragment input";
4712 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4713 "an integer, then it must be qualified with 'flat'",
4717 /* Double fragment inputs must be qualified with 'flat'. */
4718 if (var
->type
->contains_double() &&
4719 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4720 state
->stage
== MESA_SHADER_FRAGMENT
&&
4721 var
->data
.mode
== ir_var_shader_in
) {
4722 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4723 "a double, then it must be qualified with 'flat'",
4727 /* Interpolation qualifiers cannot be applied to 'centroid' and
4728 * 'centroid varying'.
4730 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4731 * "interpolation qualifiers may only precede the qualifiers in,
4732 * centroid in, out, or centroid out in a declaration. They do not apply
4733 * to the deprecated storage qualifiers varying or centroid varying."
4735 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4737 if (state
->is_version(130, 0)
4738 && this->type
->qualifier
.has_interpolation()
4739 && this->type
->qualifier
.flags
.q
.varying
) {
4741 const char *i
= interpolation_string(var
->data
.interpolation
);
4743 if (this->type
->qualifier
.flags
.q
.centroid
)
4744 s
= "centroid varying";
4748 _mesa_glsl_error(&loc
, state
,
4749 "qualifier '%s' cannot be applied to the "
4750 "deprecated storage qualifier '%s'", i
, s
);
4754 /* Interpolation qualifiers can only apply to vertex shader outputs and
4755 * fragment shader inputs.
4757 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4758 * "Outputs from a vertex shader (out) and inputs to a fragment
4759 * shader (in) can be further qualified with one or more of these
4760 * interpolation qualifiers"
4762 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4763 * "These interpolation qualifiers may only precede the qualifiers
4764 * in, centroid in, out, or centroid out in a declaration. They do
4765 * not apply to inputs into a vertex shader or outputs from a
4768 if (state
->is_version(130, 300)
4769 && this->type
->qualifier
.has_interpolation()) {
4771 const char *i
= interpolation_string(var
->data
.interpolation
);
4772 switch (state
->stage
) {
4773 case MESA_SHADER_VERTEX
:
4774 if (this->type
->qualifier
.flags
.q
.in
) {
4775 _mesa_glsl_error(&loc
, state
,
4776 "qualifier '%s' cannot be applied to vertex "
4777 "shader inputs", i
);
4780 case MESA_SHADER_FRAGMENT
:
4781 if (this->type
->qualifier
.flags
.q
.out
) {
4782 _mesa_glsl_error(&loc
, state
,
4783 "qualifier '%s' cannot be applied to fragment "
4784 "shader outputs", i
);
4793 /* From section 4.3.4 of the GLSL 4.00 spec:
4794 * "Input variables may not be declared using the patch in qualifier
4795 * in tessellation control or geometry shaders."
4797 * From section 4.3.6 of the GLSL 4.00 spec:
4798 * "It is an error to use patch out in a vertex, tessellation
4799 * evaluation, or geometry shader."
4801 * This doesn't explicitly forbid using them in a fragment shader, but
4802 * that's probably just an oversight.
4804 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4805 && this->type
->qualifier
.flags
.q
.patch
4806 && this->type
->qualifier
.flags
.q
.in
) {
4808 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4809 "tessellation evaluation shader");
4812 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4813 && this->type
->qualifier
.flags
.q
.patch
4814 && this->type
->qualifier
.flags
.q
.out
) {
4816 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4817 "tessellation control shader");
4820 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4822 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4823 state
->check_precision_qualifiers_allowed(&loc
);
4827 /* If a precision qualifier is allowed on a type, it is allowed on
4828 * an array of that type.
4830 if (!(this->type
->qualifier
.precision
== ast_precision_none
4831 || precision_qualifier_allowed(var
->type
->without_array()))) {
4833 _mesa_glsl_error(&loc
, state
,
4834 "precision qualifiers apply only to floating point"
4835 ", integer and opaque types");
4838 /* From section 4.1.7 of the GLSL 4.40 spec:
4840 * "[Opaque types] can only be declared as function
4841 * parameters or uniform-qualified variables."
4843 if (var_type
->contains_opaque() &&
4844 !this->type
->qualifier
.flags
.q
.uniform
) {
4845 _mesa_glsl_error(&loc
, state
,
4846 "opaque variables must be declared uniform");
4849 /* Process the initializer and add its instructions to a temporary
4850 * list. This list will be added to the instruction stream (below) after
4851 * the declaration is added. This is done because in some cases (such as
4852 * redeclarations) the declaration may not actually be added to the
4853 * instruction stream.
4855 exec_list initializer_instructions
;
4857 /* Examine var name here since var may get deleted in the next call */
4858 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4860 ir_variable
*earlier
=
4861 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4862 false /* allow_all_redeclarations */);
4863 if (earlier
!= NULL
) {
4865 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4866 _mesa_glsl_error(&loc
, state
,
4867 "`%s' has already been redeclared using "
4868 "gl_PerVertex", earlier
->name
);
4870 earlier
->data
.how_declared
= ir_var_declared_normally
;
4873 if (decl
->initializer
!= NULL
) {
4874 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4876 &initializer_instructions
, state
);
4878 validate_array_dimensions(var_type
, state
, &loc
);
4881 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4883 * "It is an error to write to a const variable outside of
4884 * its declaration, so they must be initialized when
4887 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4888 _mesa_glsl_error(& loc
, state
,
4889 "const declaration of `%s' must be initialized",
4893 if (state
->es_shader
) {
4894 const glsl_type
*const t
= (earlier
== NULL
)
4895 ? var
->type
: earlier
->type
;
4897 if (t
->is_unsized_array())
4898 /* Section 10.17 of the GLSL ES 1.00 specification states that
4899 * unsized array declarations have been removed from the language.
4900 * Arrays that are sized using an initializer are still explicitly
4901 * sized. However, GLSL ES 1.00 does not allow array
4902 * initializers. That is only allowed in GLSL ES 3.00.
4904 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4906 * "An array type can also be formed without specifying a size
4907 * if the definition includes an initializer:
4909 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4910 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4915 _mesa_glsl_error(& loc
, state
,
4916 "unsized array declarations are not allowed in "
4920 /* If the declaration is not a redeclaration, there are a few additional
4921 * semantic checks that must be applied. In addition, variable that was
4922 * created for the declaration should be added to the IR stream.
4924 if (earlier
== NULL
) {
4925 validate_identifier(decl
->identifier
, loc
, state
);
4927 /* Add the variable to the symbol table. Note that the initializer's
4928 * IR was already processed earlier (though it hasn't been emitted
4929 * yet), without the variable in scope.
4931 * This differs from most C-like languages, but it follows the GLSL
4932 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4935 * "Within a declaration, the scope of a name starts immediately
4936 * after the initializer if present or immediately after the name
4937 * being declared if not."
4939 if (!state
->symbols
->add_variable(var
)) {
4940 YYLTYPE loc
= this->get_location();
4941 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4942 "current scope", decl
->identifier
);
4946 /* Push the variable declaration to the top. It means that all the
4947 * variable declarations will appear in a funny last-to-first order,
4948 * but otherwise we run into trouble if a function is prototyped, a
4949 * global var is decled, then the function is defined with usage of
4950 * the global var. See glslparsertest's CorrectModule.frag.
4952 instructions
->push_head(var
);
4955 instructions
->append_list(&initializer_instructions
);
4959 /* Generally, variable declarations do not have r-values. However,
4960 * one is used for the declaration in
4962 * while (bool b = some_condition()) {
4966 * so we return the rvalue from the last seen declaration here.
4973 ast_parameter_declarator::hir(exec_list
*instructions
,
4974 struct _mesa_glsl_parse_state
*state
)
4977 const struct glsl_type
*type
;
4978 const char *name
= NULL
;
4979 YYLTYPE loc
= this->get_location();
4981 type
= this->type
->glsl_type(& name
, state
);
4985 _mesa_glsl_error(& loc
, state
,
4986 "invalid type `%s' in declaration of `%s'",
4987 name
, this->identifier
);
4989 _mesa_glsl_error(& loc
, state
,
4990 "invalid type in declaration of `%s'",
4994 type
= glsl_type::error_type
;
4997 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4999 * "Functions that accept no input arguments need not use void in the
5000 * argument list because prototypes (or definitions) are required and
5001 * therefore there is no ambiguity when an empty argument list "( )" is
5002 * declared. The idiom "(void)" as a parameter list is provided for
5005 * Placing this check here prevents a void parameter being set up
5006 * for a function, which avoids tripping up checks for main taking
5007 * parameters and lookups of an unnamed symbol.
5009 if (type
->is_void()) {
5010 if (this->identifier
!= NULL
)
5011 _mesa_glsl_error(& loc
, state
,
5012 "named parameter cannot have type `void'");
5018 if (formal_parameter
&& (this->identifier
== NULL
)) {
5019 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5023 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5024 * call already handled the "vec4[..] foo" case.
5026 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5028 if (!type
->is_error() && type
->is_unsized_array()) {
5029 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5031 type
= glsl_type::error_type
;
5035 ir_variable
*var
= new(ctx
)
5036 ir_variable(type
, this->identifier
, ir_var_function_in
);
5038 /* Apply any specified qualifiers to the parameter declaration. Note that
5039 * for function parameters the default mode is 'in'.
5041 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5044 /* From section 4.1.7 of the GLSL 4.40 spec:
5046 * "Opaque variables cannot be treated as l-values; hence cannot
5047 * be used as out or inout function parameters, nor can they be
5050 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5051 && type
->contains_opaque()) {
5052 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5053 "contain opaque variables");
5054 type
= glsl_type::error_type
;
5057 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5059 * "When calling a function, expressions that do not evaluate to
5060 * l-values cannot be passed to parameters declared as out or inout."
5062 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5064 * "Other binary or unary expressions, non-dereferenced arrays,
5065 * function names, swizzles with repeated fields, and constants
5066 * cannot be l-values."
5068 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5069 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5071 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5073 && !state
->check_version(120, 100, &loc
,
5074 "arrays cannot be out or inout parameters")) {
5075 type
= glsl_type::error_type
;
5078 instructions
->push_tail(var
);
5080 /* Parameter declarations do not have r-values.
5087 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5089 exec_list
*ir_parameters
,
5090 _mesa_glsl_parse_state
*state
)
5092 ast_parameter_declarator
*void_param
= NULL
;
5095 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5096 param
->formal_parameter
= formal
;
5097 param
->hir(ir_parameters
, state
);
5105 if ((void_param
!= NULL
) && (count
> 1)) {
5106 YYLTYPE loc
= void_param
->get_location();
5108 _mesa_glsl_error(& loc
, state
,
5109 "`void' parameter must be only parameter");
5115 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5117 /* IR invariants disallow function declarations or definitions
5118 * nested within other function definitions. But there is no
5119 * requirement about the relative order of function declarations
5120 * and definitions with respect to one another. So simply insert
5121 * the new ir_function block at the end of the toplevel instruction
5124 state
->toplevel_ir
->push_tail(f
);
5129 ast_function::hir(exec_list
*instructions
,
5130 struct _mesa_glsl_parse_state
*state
)
5133 ir_function
*f
= NULL
;
5134 ir_function_signature
*sig
= NULL
;
5135 exec_list hir_parameters
;
5136 YYLTYPE loc
= this->get_location();
5138 const char *const name
= identifier
;
5140 /* New functions are always added to the top-level IR instruction stream,
5141 * so this instruction list pointer is ignored. See also emit_function
5144 (void) instructions
;
5146 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5148 * "Function declarations (prototypes) cannot occur inside of functions;
5149 * they must be at global scope, or for the built-in functions, outside
5150 * the global scope."
5152 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5154 * "User defined functions may only be defined within the global scope."
5156 * Note that this language does not appear in GLSL 1.10.
5158 if ((state
->current_function
!= NULL
) &&
5159 state
->is_version(120, 100)) {
5160 YYLTYPE loc
= this->get_location();
5161 _mesa_glsl_error(&loc
, state
,
5162 "declaration of function `%s' not allowed within "
5163 "function body", name
);
5166 validate_identifier(name
, this->get_location(), state
);
5168 /* Convert the list of function parameters to HIR now so that they can be
5169 * used below to compare this function's signature with previously seen
5170 * signatures for functions with the same name.
5172 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5174 & hir_parameters
, state
);
5176 const char *return_type_name
;
5177 const glsl_type
*return_type
=
5178 this->return_type
->glsl_type(& return_type_name
, state
);
5181 YYLTYPE loc
= this->get_location();
5182 _mesa_glsl_error(&loc
, state
,
5183 "function `%s' has undeclared return type `%s'",
5184 name
, return_type_name
);
5185 return_type
= glsl_type::error_type
;
5188 /* ARB_shader_subroutine states:
5189 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5190 * subroutine(...) to a function declaration."
5192 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5193 YYLTYPE loc
= this->get_location();
5194 _mesa_glsl_error(&loc
, state
,
5195 "function declaration `%s' cannot have subroutine prepended",
5199 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5200 * "No qualifier is allowed on the return type of a function."
5202 if (this->return_type
->has_qualifiers(state
)) {
5203 YYLTYPE loc
= this->get_location();
5204 _mesa_glsl_error(& loc
, state
,
5205 "function `%s' return type has qualifiers", name
);
5208 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5210 * "Arrays are allowed as arguments and as the return type. In both
5211 * cases, the array must be explicitly sized."
5213 if (return_type
->is_unsized_array()) {
5214 YYLTYPE loc
= this->get_location();
5215 _mesa_glsl_error(& loc
, state
,
5216 "function `%s' return type array must be explicitly "
5220 /* From section 4.1.7 of the GLSL 4.40 spec:
5222 * "[Opaque types] can only be declared as function parameters
5223 * or uniform-qualified variables."
5225 if (return_type
->contains_opaque()) {
5226 YYLTYPE loc
= this->get_location();
5227 _mesa_glsl_error(&loc
, state
,
5228 "function `%s' return type can't contain an opaque type",
5232 /* Create an ir_function if one doesn't already exist. */
5233 f
= state
->symbols
->get_function(name
);
5235 f
= new(ctx
) ir_function(name
);
5236 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5237 if (!state
->symbols
->add_function(f
)) {
5238 /* This function name shadows a non-function use of the same name. */
5239 YYLTYPE loc
= this->get_location();
5240 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5241 "non-function", name
);
5245 emit_function(state
, f
);
5248 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5250 * "A shader cannot redefine or overload built-in functions."
5252 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5254 * "User code can overload the built-in functions but cannot redefine
5257 if (state
->es_shader
&& state
->language_version
>= 300) {
5258 /* Local shader has no exact candidates; check the built-ins. */
5259 _mesa_glsl_initialize_builtin_functions();
5260 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5261 YYLTYPE loc
= this->get_location();
5262 _mesa_glsl_error(& loc
, state
,
5263 "A shader cannot redefine or overload built-in "
5264 "function `%s' in GLSL ES 3.00", name
);
5269 /* Verify that this function's signature either doesn't match a previously
5270 * seen signature for a function with the same name, or, if a match is found,
5271 * that the previously seen signature does not have an associated definition.
5273 if (state
->es_shader
|| f
->has_user_signature()) {
5274 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5276 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5277 if (badvar
!= NULL
) {
5278 YYLTYPE loc
= this->get_location();
5280 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5281 "qualifiers don't match prototype", name
, badvar
);
5284 if (sig
->return_type
!= return_type
) {
5285 YYLTYPE loc
= this->get_location();
5287 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5288 "match prototype", name
);
5291 if (sig
->is_defined
) {
5292 if (is_definition
) {
5293 YYLTYPE loc
= this->get_location();
5294 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5296 /* We just encountered a prototype that exactly matches a
5297 * function that's already been defined. This is redundant,
5298 * and we should ignore it.
5306 /* Verify the return type of main() */
5307 if (strcmp(name
, "main") == 0) {
5308 if (! return_type
->is_void()) {
5309 YYLTYPE loc
= this->get_location();
5311 _mesa_glsl_error(& loc
, state
, "main() must return void");
5314 if (!hir_parameters
.is_empty()) {
5315 YYLTYPE loc
= this->get_location();
5317 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5321 /* Finish storing the information about this new function in its signature.
5324 sig
= new(ctx
) ir_function_signature(return_type
);
5325 f
->add_signature(sig
);
5328 sig
->replace_parameters(&hir_parameters
);
5331 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5334 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5335 unsigned qual_index
;
5336 if (process_qualifier_constant(state
, &loc
, "index",
5337 this->return_type
->qualifier
.index
,
5339 if (!state
->has_explicit_uniform_location()) {
5340 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5341 "GL_ARB_explicit_uniform_location or "
5343 } else if (qual_index
>= MAX_SUBROUTINES
) {
5344 _mesa_glsl_error(&loc
, state
,
5345 "invalid subroutine index (%d) index must "
5346 "be a number between 0 and "
5347 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5348 MAX_SUBROUTINES
- 1);
5350 f
->subroutine_index
= qual_index
;
5355 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5356 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5357 f
->num_subroutine_types
);
5359 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5360 const struct glsl_type
*type
;
5361 /* the subroutine type must be already declared */
5362 type
= state
->symbols
->get_type(decl
->identifier
);
5364 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5366 f
->subroutine_types
[idx
++] = type
;
5368 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5370 state
->num_subroutines
+ 1);
5371 state
->subroutines
[state
->num_subroutines
] = f
;
5372 state
->num_subroutines
++;
5376 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5377 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5378 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5381 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5383 state
->num_subroutine_types
+ 1);
5384 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5385 state
->num_subroutine_types
++;
5387 f
->is_subroutine
= true;
5390 /* Function declarations (prototypes) do not have r-values.
5397 ast_function_definition::hir(exec_list
*instructions
,
5398 struct _mesa_glsl_parse_state
*state
)
5400 prototype
->is_definition
= true;
5401 prototype
->hir(instructions
, state
);
5403 ir_function_signature
*signature
= prototype
->signature
;
5404 if (signature
== NULL
)
5407 assert(state
->current_function
== NULL
);
5408 state
->current_function
= signature
;
5409 state
->found_return
= false;
5411 /* Duplicate parameters declared in the prototype as concrete variables.
5412 * Add these to the symbol table.
5414 state
->symbols
->push_scope();
5415 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5416 assert(var
->as_variable() != NULL
);
5418 /* The only way a parameter would "exist" is if two parameters have
5421 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5422 YYLTYPE loc
= this->get_location();
5424 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5426 state
->symbols
->add_variable(var
);
5430 /* Convert the body of the function to HIR. */
5431 this->body
->hir(&signature
->body
, state
);
5432 signature
->is_defined
= true;
5434 state
->symbols
->pop_scope();
5436 assert(state
->current_function
== signature
);
5437 state
->current_function
= NULL
;
5439 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5440 YYLTYPE loc
= this->get_location();
5441 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5442 "%s, but no return statement",
5443 signature
->function_name(),
5444 signature
->return_type
->name
);
5447 /* Function definitions do not have r-values.
5454 ast_jump_statement::hir(exec_list
*instructions
,
5455 struct _mesa_glsl_parse_state
*state
)
5462 assert(state
->current_function
);
5464 if (opt_return_value
) {
5465 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5467 /* The value of the return type can be NULL if the shader says
5468 * 'return foo();' and foo() is a function that returns void.
5470 * NOTE: The GLSL spec doesn't say that this is an error. The type
5471 * of the return value is void. If the return type of the function is
5472 * also void, then this should compile without error. Seriously.
5474 const glsl_type
*const ret_type
=
5475 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5477 /* Implicit conversions are not allowed for return values prior to
5478 * ARB_shading_language_420pack.
5480 if (state
->current_function
->return_type
!= ret_type
) {
5481 YYLTYPE loc
= this->get_location();
5483 if (state
->has_420pack()) {
5484 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5486 _mesa_glsl_error(& loc
, state
,
5487 "could not implicitly convert return value "
5488 "to %s, in function `%s'",
5489 state
->current_function
->return_type
->name
,
5490 state
->current_function
->function_name());
5493 _mesa_glsl_error(& loc
, state
,
5494 "`return' with wrong type %s, in function `%s' "
5497 state
->current_function
->function_name(),
5498 state
->current_function
->return_type
->name
);
5500 } else if (state
->current_function
->return_type
->base_type
==
5502 YYLTYPE loc
= this->get_location();
5504 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5505 * specs add a clarification:
5507 * "A void function can only use return without a return argument, even if
5508 * the return argument has void type. Return statements only accept values:
5511 * void func2() { return func1(); } // illegal return statement"
5513 _mesa_glsl_error(& loc
, state
,
5514 "void functions can only use `return' without a "
5518 inst
= new(ctx
) ir_return(ret
);
5520 if (state
->current_function
->return_type
->base_type
!=
5522 YYLTYPE loc
= this->get_location();
5524 _mesa_glsl_error(& loc
, state
,
5525 "`return' with no value, in function %s returning "
5527 state
->current_function
->function_name());
5529 inst
= new(ctx
) ir_return
;
5532 state
->found_return
= true;
5533 instructions
->push_tail(inst
);
5538 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5539 YYLTYPE loc
= this->get_location();
5541 _mesa_glsl_error(& loc
, state
,
5542 "`discard' may only appear in a fragment shader");
5544 instructions
->push_tail(new(ctx
) ir_discard
);
5549 if (mode
== ast_continue
&&
5550 state
->loop_nesting_ast
== NULL
) {
5551 YYLTYPE loc
= this->get_location();
5553 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5554 } else if (mode
== ast_break
&&
5555 state
->loop_nesting_ast
== NULL
&&
5556 state
->switch_state
.switch_nesting_ast
== NULL
) {
5557 YYLTYPE loc
= this->get_location();
5559 _mesa_glsl_error(& loc
, state
,
5560 "break may only appear in a loop or a switch");
5562 /* For a loop, inline the for loop expression again, since we don't
5563 * know where near the end of the loop body the normal copy of it is
5564 * going to be placed. Same goes for the condition for a do-while
5567 if (state
->loop_nesting_ast
!= NULL
&&
5568 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5569 if (state
->loop_nesting_ast
->rest_expression
) {
5570 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5573 if (state
->loop_nesting_ast
->mode
==
5574 ast_iteration_statement::ast_do_while
) {
5575 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5579 if (state
->switch_state
.is_switch_innermost
&&
5580 mode
== ast_continue
) {
5581 /* Set 'continue_inside' to true. */
5582 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5583 ir_dereference_variable
*deref_continue_inside_var
=
5584 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5585 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5588 /* Break out from the switch, continue for the loop will
5589 * be called right after switch. */
5590 ir_loop_jump
*const jump
=
5591 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5592 instructions
->push_tail(jump
);
5594 } else if (state
->switch_state
.is_switch_innermost
&&
5595 mode
== ast_break
) {
5596 /* Force break out of switch by inserting a break. */
5597 ir_loop_jump
*const jump
=
5598 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5599 instructions
->push_tail(jump
);
5601 ir_loop_jump
*const jump
=
5602 new(ctx
) ir_loop_jump((mode
== ast_break
)
5603 ? ir_loop_jump::jump_break
5604 : ir_loop_jump::jump_continue
);
5605 instructions
->push_tail(jump
);
5612 /* Jump instructions do not have r-values.
5619 ast_selection_statement::hir(exec_list
*instructions
,
5620 struct _mesa_glsl_parse_state
*state
)
5624 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5626 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5628 * "Any expression whose type evaluates to a Boolean can be used as the
5629 * conditional expression bool-expression. Vector types are not accepted
5630 * as the expression to if."
5632 * The checks are separated so that higher quality diagnostics can be
5633 * generated for cases where both rules are violated.
5635 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5636 YYLTYPE loc
= this->condition
->get_location();
5638 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5642 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5644 if (then_statement
!= NULL
) {
5645 state
->symbols
->push_scope();
5646 then_statement
->hir(& stmt
->then_instructions
, state
);
5647 state
->symbols
->pop_scope();
5650 if (else_statement
!= NULL
) {
5651 state
->symbols
->push_scope();
5652 else_statement
->hir(& stmt
->else_instructions
, state
);
5653 state
->symbols
->pop_scope();
5656 instructions
->push_tail(stmt
);
5658 /* if-statements do not have r-values.
5665 ast_switch_statement::hir(exec_list
*instructions
,
5666 struct _mesa_glsl_parse_state
*state
)
5670 ir_rvalue
*const test_expression
=
5671 this->test_expression
->hir(instructions
, state
);
5673 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5675 * "The type of init-expression in a switch statement must be a
5678 if (!test_expression
->type
->is_scalar() ||
5679 !test_expression
->type
->is_integer()) {
5680 YYLTYPE loc
= this->test_expression
->get_location();
5682 _mesa_glsl_error(& loc
,
5684 "switch-statement expression must be scalar "
5688 /* Track the switch-statement nesting in a stack-like manner.
5690 struct glsl_switch_state saved
= state
->switch_state
;
5692 state
->switch_state
.is_switch_innermost
= true;
5693 state
->switch_state
.switch_nesting_ast
= this;
5694 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5695 hash_table_pointer_compare
);
5696 state
->switch_state
.previous_default
= NULL
;
5698 /* Initalize is_fallthru state to false.
5700 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5701 state
->switch_state
.is_fallthru_var
=
5702 new(ctx
) ir_variable(glsl_type::bool_type
,
5703 "switch_is_fallthru_tmp",
5705 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5707 ir_dereference_variable
*deref_is_fallthru_var
=
5708 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5709 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5712 /* Initialize continue_inside state to false.
5714 state
->switch_state
.continue_inside
=
5715 new(ctx
) ir_variable(glsl_type::bool_type
,
5716 "continue_inside_tmp",
5718 instructions
->push_tail(state
->switch_state
.continue_inside
);
5720 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5721 ir_dereference_variable
*deref_continue_inside_var
=
5722 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5723 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5726 state
->switch_state
.run_default
=
5727 new(ctx
) ir_variable(glsl_type::bool_type
,
5730 instructions
->push_tail(state
->switch_state
.run_default
);
5732 /* Loop around the switch is used for flow control. */
5733 ir_loop
* loop
= new(ctx
) ir_loop();
5734 instructions
->push_tail(loop
);
5736 /* Cache test expression.
5738 test_to_hir(&loop
->body_instructions
, state
);
5740 /* Emit code for body of switch stmt.
5742 body
->hir(&loop
->body_instructions
, state
);
5744 /* Insert a break at the end to exit loop. */
5745 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5746 loop
->body_instructions
.push_tail(jump
);
5748 /* If we are inside loop, check if continue got called inside switch. */
5749 if (state
->loop_nesting_ast
!= NULL
) {
5750 ir_dereference_variable
*deref_continue_inside
=
5751 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5752 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5753 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5755 if (state
->loop_nesting_ast
!= NULL
) {
5756 if (state
->loop_nesting_ast
->rest_expression
) {
5757 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5760 if (state
->loop_nesting_ast
->mode
==
5761 ast_iteration_statement::ast_do_while
) {
5762 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5765 irif
->then_instructions
.push_tail(jump
);
5766 instructions
->push_tail(irif
);
5769 hash_table_dtor(state
->switch_state
.labels_ht
);
5771 state
->switch_state
= saved
;
5773 /* Switch statements do not have r-values. */
5779 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5780 struct _mesa_glsl_parse_state
*state
)
5784 /* set to true to avoid a duplicate "use of uninitialized variable" warning
5785 * on the switch test case. The first one would be already raised when
5786 * getting the test_expression at ast_switch_statement::hir
5788 test_expression
->set_is_lhs(true);
5789 /* Cache value of test expression. */
5790 ir_rvalue
*const test_val
=
5791 test_expression
->hir(instructions
,
5794 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5797 ir_dereference_variable
*deref_test_var
=
5798 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5800 instructions
->push_tail(state
->switch_state
.test_var
);
5801 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5806 ast_switch_body::hir(exec_list
*instructions
,
5807 struct _mesa_glsl_parse_state
*state
)
5810 stmts
->hir(instructions
, state
);
5812 /* Switch bodies do not have r-values. */
5817 ast_case_statement_list::hir(exec_list
*instructions
,
5818 struct _mesa_glsl_parse_state
*state
)
5820 exec_list default_case
, after_default
, tmp
;
5822 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5823 case_stmt
->hir(&tmp
, state
);
5826 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5827 default_case
.append_list(&tmp
);
5831 /* If default case found, append 'after_default' list. */
5832 if (!default_case
.is_empty())
5833 after_default
.append_list(&tmp
);
5835 instructions
->append_list(&tmp
);
5838 /* Handle the default case. This is done here because default might not be
5839 * the last case. We need to add checks against following cases first to see
5840 * if default should be chosen or not.
5842 if (!default_case
.is_empty()) {
5844 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5845 ir_dereference_variable
*deref_run_default_var
=
5846 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5848 /* Choose to run default case initially, following conditional
5849 * assignments might change this.
5851 ir_assignment
*const init_var
=
5852 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5853 instructions
->push_tail(init_var
);
5855 /* Default case was the last one, no checks required. */
5856 if (after_default
.is_empty()) {
5857 instructions
->append_list(&default_case
);
5861 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5862 ir_assignment
*assign
= ir
->as_assignment();
5867 /* Clone the check between case label and init expression. */
5868 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5869 ir_expression
*clone
= exp
->clone(state
, NULL
);
5871 ir_dereference_variable
*deref_var
=
5872 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5873 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5875 ir_assignment
*const set_false
=
5876 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5878 instructions
->push_tail(set_false
);
5881 /* Append default case and all cases after it. */
5882 instructions
->append_list(&default_case
);
5883 instructions
->append_list(&after_default
);
5886 /* Case statements do not have r-values. */
5891 ast_case_statement::hir(exec_list
*instructions
,
5892 struct _mesa_glsl_parse_state
*state
)
5894 labels
->hir(instructions
, state
);
5896 /* Guard case statements depending on fallthru state. */
5897 ir_dereference_variable
*const deref_fallthru_guard
=
5898 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5899 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5901 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5902 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5904 instructions
->push_tail(test_fallthru
);
5906 /* Case statements do not have r-values. */
5912 ast_case_label_list::hir(exec_list
*instructions
,
5913 struct _mesa_glsl_parse_state
*state
)
5915 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5916 label
->hir(instructions
, state
);
5918 /* Case labels do not have r-values. */
5923 ast_case_label::hir(exec_list
*instructions
,
5924 struct _mesa_glsl_parse_state
*state
)
5928 ir_dereference_variable
*deref_fallthru_var
=
5929 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5931 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5933 /* If not default case, ... */
5934 if (this->test_value
!= NULL
) {
5935 /* Conditionally set fallthru state based on
5936 * comparison of cached test expression value to case label.
5938 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5939 ir_constant
*label_const
= label_rval
->constant_expression_value();
5942 YYLTYPE loc
= this->test_value
->get_location();
5944 _mesa_glsl_error(& loc
, state
,
5945 "switch statement case label must be a "
5946 "constant expression");
5948 /* Stuff a dummy value in to allow processing to continue. */
5949 label_const
= new(ctx
) ir_constant(0);
5951 ast_expression
*previous_label
= (ast_expression
*)
5952 hash_table_find(state
->switch_state
.labels_ht
,
5953 (void *)(uintptr_t)label_const
->value
.u
[0]);
5955 if (previous_label
) {
5956 YYLTYPE loc
= this->test_value
->get_location();
5957 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5959 loc
= previous_label
->get_location();
5960 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5962 hash_table_insert(state
->switch_state
.labels_ht
,
5964 (void *)(uintptr_t)label_const
->value
.u
[0]);
5968 ir_dereference_variable
*deref_test_var
=
5969 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5971 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5976 * From GLSL 4.40 specification section 6.2 ("Selection"):
5978 * "The type of the init-expression value in a switch statement must
5979 * be a scalar int or uint. The type of the constant-expression value
5980 * in a case label also must be a scalar int or uint. When any pair
5981 * of these values is tested for "equal value" and the types do not
5982 * match, an implicit conversion will be done to convert the int to a
5983 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5986 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5987 YYLTYPE loc
= this->test_value
->get_location();
5989 const glsl_type
*type_a
= label_const
->type
;
5990 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5992 /* Check if int->uint implicit conversion is supported. */
5993 bool integer_conversion_supported
=
5994 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5997 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5998 !integer_conversion_supported
) {
5999 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6000 "init-expression and case label (%s != %s)",
6001 type_a
->name
, type_b
->name
);
6003 /* Conversion of the case label. */
6004 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6005 if (!apply_implicit_conversion(glsl_type::uint_type
,
6006 test_cond
->operands
[0], state
))
6007 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6009 /* Conversion of the init-expression value. */
6010 if (!apply_implicit_conversion(glsl_type::uint_type
,
6011 test_cond
->operands
[1], state
))
6012 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6017 ir_assignment
*set_fallthru_on_test
=
6018 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6020 instructions
->push_tail(set_fallthru_on_test
);
6021 } else { /* default case */
6022 if (state
->switch_state
.previous_default
) {
6023 YYLTYPE loc
= this->get_location();
6024 _mesa_glsl_error(& loc
, state
,
6025 "multiple default labels in one switch");
6027 loc
= state
->switch_state
.previous_default
->get_location();
6028 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6030 state
->switch_state
.previous_default
= this;
6032 /* Set fallthru condition on 'run_default' bool. */
6033 ir_dereference_variable
*deref_run_default
=
6034 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6035 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6036 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6040 /* Set falltrhu state. */
6041 ir_assignment
*set_fallthru
=
6042 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6044 instructions
->push_tail(set_fallthru
);
6047 /* Case statements do not have r-values. */
6052 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6053 struct _mesa_glsl_parse_state
*state
)
6057 if (condition
!= NULL
) {
6058 ir_rvalue
*const cond
=
6059 condition
->hir(instructions
, state
);
6062 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6063 YYLTYPE loc
= condition
->get_location();
6065 _mesa_glsl_error(& loc
, state
,
6066 "loop condition must be scalar boolean");
6068 /* As the first code in the loop body, generate a block that looks
6069 * like 'if (!condition) break;' as the loop termination condition.
6071 ir_rvalue
*const not_cond
=
6072 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6074 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6076 ir_jump
*const break_stmt
=
6077 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6079 if_stmt
->then_instructions
.push_tail(break_stmt
);
6080 instructions
->push_tail(if_stmt
);
6087 ast_iteration_statement::hir(exec_list
*instructions
,
6088 struct _mesa_glsl_parse_state
*state
)
6092 /* For-loops and while-loops start a new scope, but do-while loops do not.
6094 if (mode
!= ast_do_while
)
6095 state
->symbols
->push_scope();
6097 if (init_statement
!= NULL
)
6098 init_statement
->hir(instructions
, state
);
6100 ir_loop
*const stmt
= new(ctx
) ir_loop();
6101 instructions
->push_tail(stmt
);
6103 /* Track the current loop nesting. */
6104 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6106 state
->loop_nesting_ast
= this;
6108 /* Likewise, indicate that following code is closest to a loop,
6109 * NOT closest to a switch.
6111 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6112 state
->switch_state
.is_switch_innermost
= false;
6114 if (mode
!= ast_do_while
)
6115 condition_to_hir(&stmt
->body_instructions
, state
);
6118 body
->hir(& stmt
->body_instructions
, state
);
6120 if (rest_expression
!= NULL
)
6121 rest_expression
->hir(& stmt
->body_instructions
, state
);
6123 if (mode
== ast_do_while
)
6124 condition_to_hir(&stmt
->body_instructions
, state
);
6126 if (mode
!= ast_do_while
)
6127 state
->symbols
->pop_scope();
6129 /* Restore previous nesting before returning. */
6130 state
->loop_nesting_ast
= nesting_ast
;
6131 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6133 /* Loops do not have r-values.
6140 * Determine if the given type is valid for establishing a default precision
6143 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6145 * "The precision statement
6147 * precision precision-qualifier type;
6149 * can be used to establish a default precision qualifier. The type field
6150 * can be either int or float or any of the sampler types, and the
6151 * precision-qualifier can be lowp, mediump, or highp."
6153 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6154 * qualifiers on sampler types, but this seems like an oversight (since the
6155 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6156 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6160 is_valid_default_precision_type(const struct glsl_type
*const type
)
6165 switch (type
->base_type
) {
6167 case GLSL_TYPE_FLOAT
:
6168 /* "int" and "float" are valid, but vectors and matrices are not. */
6169 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6170 case GLSL_TYPE_SAMPLER
:
6171 case GLSL_TYPE_IMAGE
:
6172 case GLSL_TYPE_ATOMIC_UINT
:
6181 ast_type_specifier::hir(exec_list
*instructions
,
6182 struct _mesa_glsl_parse_state
*state
)
6184 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6187 YYLTYPE loc
= this->get_location();
6189 /* If this is a precision statement, check that the type to which it is
6190 * applied is either float or int.
6192 * From section 4.5.3 of the GLSL 1.30 spec:
6193 * "The precision statement
6194 * precision precision-qualifier type;
6195 * can be used to establish a default precision qualifier. The type
6196 * field can be either int or float [...]. Any other types or
6197 * qualifiers will result in an error.
6199 if (this->default_precision
!= ast_precision_none
) {
6200 if (!state
->check_precision_qualifiers_allowed(&loc
))
6203 if (this->structure
!= NULL
) {
6204 _mesa_glsl_error(&loc
, state
,
6205 "precision qualifiers do not apply to structures");
6209 if (this->array_specifier
!= NULL
) {
6210 _mesa_glsl_error(&loc
, state
,
6211 "default precision statements do not apply to "
6216 const struct glsl_type
*const type
=
6217 state
->symbols
->get_type(this->type_name
);
6218 if (!is_valid_default_precision_type(type
)) {
6219 _mesa_glsl_error(&loc
, state
,
6220 "default precision statements apply only to "
6221 "float, int, and opaque types");
6225 if (state
->es_shader
) {
6226 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6229 * "Non-precision qualified declarations will use the precision
6230 * qualifier specified in the most recent precision statement
6231 * that is still in scope. The precision statement has the same
6232 * scoping rules as variable declarations. If it is declared
6233 * inside a compound statement, its effect stops at the end of
6234 * the innermost statement it was declared in. Precision
6235 * statements in nested scopes override precision statements in
6236 * outer scopes. Multiple precision statements for the same basic
6237 * type can appear inside the same scope, with later statements
6238 * overriding earlier statements within that scope."
6240 * Default precision specifications follow the same scope rules as
6241 * variables. So, we can track the state of the default precision
6242 * qualifiers in the symbol table, and the rules will just work. This
6243 * is a slight abuse of the symbol table, but it has the semantics
6246 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6247 this->default_precision
);
6250 /* FINISHME: Translate precision statements into IR. */
6254 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6255 * process_record_constructor() can do type-checking on C-style initializer
6256 * expressions of structs, but ast_struct_specifier should only be translated
6257 * to HIR if it is declaring the type of a structure.
6259 * The ->is_declaration field is false for initializers of variables
6260 * declared separately from the struct's type definition.
6262 * struct S { ... }; (is_declaration = true)
6263 * struct T { ... } t = { ... }; (is_declaration = true)
6264 * S s = { ... }; (is_declaration = false)
6266 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6267 return this->structure
->hir(instructions
, state
);
6274 * Process a structure or interface block tree into an array of structure fields
6276 * After parsing, where there are some syntax differnces, structures and
6277 * interface blocks are almost identical. They are similar enough that the
6278 * AST for each can be processed the same way into a set of
6279 * \c glsl_struct_field to describe the members.
6281 * If we're processing an interface block, var_mode should be the type of the
6282 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6283 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6287 * The number of fields processed. A pointer to the array structure fields is
6288 * stored in \c *fields_ret.
6291 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6292 struct _mesa_glsl_parse_state
*state
,
6293 exec_list
*declarations
,
6294 glsl_struct_field
**fields_ret
,
6296 enum glsl_matrix_layout matrix_layout
,
6297 bool allow_reserved_names
,
6298 ir_variable_mode var_mode
,
6299 ast_type_qualifier
*layout
,
6300 unsigned block_stream
,
6301 unsigned expl_location
,
6302 unsigned expl_align
)
6304 unsigned decl_count
= 0;
6305 unsigned next_offset
= 0;
6307 /* Make an initial pass over the list of fields to determine how
6308 * many there are. Each element in this list is an ast_declarator_list.
6309 * This means that we actually need to count the number of elements in the
6310 * 'declarations' list in each of the elements.
6312 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6313 decl_count
+= decl_list
->declarations
.length();
6316 /* Allocate storage for the fields and process the field
6317 * declarations. As the declarations are processed, try to also convert
6318 * the types to HIR. This ensures that structure definitions embedded in
6319 * other structure definitions or in interface blocks are processed.
6321 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6324 bool first_member
= true;
6325 bool first_member_has_explicit_location
= false;
6328 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6329 const char *type_name
;
6330 YYLTYPE loc
= decl_list
->get_location();
6332 decl_list
->type
->specifier
->hir(instructions
, state
);
6334 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6336 * "Anonymous structures are not supported; so embedded structures
6337 * must have a declarator. A name given to an embedded struct is
6338 * scoped at the same level as the struct it is embedded in."
6340 * The same section of the GLSL 1.20 spec says:
6342 * "Anonymous structures are not supported. Embedded structures are
6345 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6346 * embedded structures in 1.10 only.
6348 if (state
->language_version
!= 110 &&
6349 decl_list
->type
->specifier
->structure
!= NULL
)
6350 _mesa_glsl_error(&loc
, state
,
6351 "embedded structure declarations are not allowed");
6353 const glsl_type
*decl_type
=
6354 decl_list
->type
->glsl_type(& type_name
, state
);
6356 const struct ast_type_qualifier
*const qual
=
6357 &decl_list
->type
->qualifier
;
6359 /* From section 4.3.9 of the GLSL 4.40 spec:
6361 * "[In interface blocks] opaque types are not allowed."
6363 * It should be impossible for decl_type to be NULL here. Cases that
6364 * might naturally lead to decl_type being NULL, especially for the
6365 * is_interface case, will have resulted in compilation having
6366 * already halted due to a syntax error.
6371 if (decl_type
->contains_opaque()) {
6372 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6373 "interface block contains opaque variable");
6376 if (decl_type
->contains_atomic()) {
6377 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6379 * "Members of structures cannot be declared as atomic counter
6382 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6385 if (decl_type
->contains_image()) {
6386 /* FINISHME: Same problem as with atomic counters.
6387 * FINISHME: Request clarification from Khronos and add
6388 * FINISHME: spec quotation here.
6390 _mesa_glsl_error(&loc
, state
, "image in structure");
6394 if (qual
->flags
.q
.explicit_binding
) {
6395 _mesa_glsl_error(&loc
, state
,
6396 "binding layout qualifier cannot be applied "
6397 "to struct or interface block members");
6401 if (!first_member
) {
6402 if (!layout
->flags
.q
.explicit_location
&&
6403 ((first_member_has_explicit_location
&&
6404 !qual
->flags
.q
.explicit_location
) ||
6405 (!first_member_has_explicit_location
&&
6406 qual
->flags
.q
.explicit_location
))) {
6407 _mesa_glsl_error(&loc
, state
,
6408 "when block-level location layout qualifier "
6409 "is not supplied either all members must "
6410 "have a location layout qualifier or all "
6411 "members must not have a location layout "
6415 first_member
= false;
6416 first_member_has_explicit_location
=
6417 qual
->flags
.q
.explicit_location
;
6421 if (qual
->flags
.q
.std140
||
6422 qual
->flags
.q
.std430
||
6423 qual
->flags
.q
.packed
||
6424 qual
->flags
.q
.shared
) {
6425 _mesa_glsl_error(&loc
, state
,
6426 "uniform/shader storage block layout qualifiers "
6427 "std140, std430, packed, and shared can only be "
6428 "applied to uniform/shader storage blocks, not "
6432 if (qual
->flags
.q
.constant
) {
6433 _mesa_glsl_error(&loc
, state
,
6434 "const storage qualifier cannot be applied "
6435 "to struct or interface block members");
6438 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6440 * "A block member may be declared with a stream identifier, but
6441 * the specified stream must match the stream associated with the
6442 * containing block."
6444 if (qual
->flags
.q
.explicit_stream
) {
6445 unsigned qual_stream
;
6446 if (process_qualifier_constant(state
, &loc
, "stream",
6447 qual
->stream
, &qual_stream
) &&
6448 qual_stream
!= block_stream
) {
6449 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6450 "interface block member does not match "
6451 "the interface block (%u vs %u)", qual_stream
,
6456 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6457 _mesa_glsl_error(&loc
, state
,
6458 "interpolation qualifiers cannot be used "
6459 "with uniform interface blocks");
6462 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6463 qual
->has_auxiliary_storage()) {
6464 _mesa_glsl_error(&loc
, state
,
6465 "auxiliary storage qualifiers cannot be used "
6466 "in uniform blocks or structures.");
6469 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6470 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6471 _mesa_glsl_error(&loc
, state
,
6472 "row_major and column_major can only be "
6473 "applied to interface blocks");
6475 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6478 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6479 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6480 "readonly and writeonly.");
6483 foreach_list_typed (ast_declaration
, decl
, link
,
6484 &decl_list
->declarations
) {
6485 YYLTYPE loc
= decl
->get_location();
6487 if (!allow_reserved_names
)
6488 validate_identifier(decl
->identifier
, loc
, state
);
6490 const struct glsl_type
*field_type
=
6491 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6492 validate_array_dimensions(field_type
, state
, &loc
);
6493 fields
[i
].type
= field_type
;
6494 fields
[i
].name
= decl
->identifier
;
6495 fields
[i
].interpolation
=
6496 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
6497 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6498 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6499 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6500 fields
[i
].precision
= qual
->precision
;
6502 if (qual
->flags
.q
.explicit_location
) {
6503 unsigned qual_location
;
6504 if (process_qualifier_constant(state
, &loc
, "location",
6505 qual
->location
, &qual_location
)) {
6506 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6507 expl_location
= fields
[i
].location
+
6508 fields
[i
].type
->count_attribute_slots(false);
6511 if (layout
&& layout
->flags
.q
.explicit_location
) {
6512 fields
[i
].location
= expl_location
;
6513 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6515 fields
[i
].location
= -1;
6519 /* Offset can only be used with std430 and std140 layouts an initial
6520 * value of 0 is used for error detection.
6526 if (qual
->flags
.q
.row_major
||
6527 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6533 if(layout
->flags
.q
.std140
) {
6534 align
= field_type
->std140_base_alignment(row_major
);
6535 size
= field_type
->std140_size(row_major
);
6536 } else if (layout
->flags
.q
.std430
) {
6537 align
= field_type
->std430_base_alignment(row_major
);
6538 size
= field_type
->std430_size(row_major
);
6542 if (qual
->flags
.q
.explicit_offset
) {
6543 unsigned qual_offset
;
6544 if (process_qualifier_constant(state
, &loc
, "offset",
6545 qual
->offset
, &qual_offset
)) {
6546 if (align
!= 0 && size
!= 0) {
6547 if (next_offset
> qual_offset
)
6548 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6549 "offset overlaps previous member");
6551 if (qual_offset
% align
) {
6552 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6553 "must be a multiple of the base "
6554 "alignment of %s", field_type
->name
);
6556 fields
[i
].offset
= qual_offset
;
6557 next_offset
= glsl_align(qual_offset
+ size
, align
);
6559 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6560 "with std430 and std140 layouts");
6564 fields
[i
].offset
= -1;
6567 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6568 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6570 if (align
== 0 || size
== 0) {
6571 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6572 "std430 and std140 layouts");
6573 } else if (qual
->flags
.q
.explicit_align
) {
6574 unsigned member_align
;
6575 if (process_qualifier_constant(state
, &loc
, "align",
6576 qual
->align
, &member_align
)) {
6577 if (member_align
== 0 ||
6578 member_align
& (member_align
- 1)) {
6579 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6580 "in not a power of 2");
6582 fields
[i
].offset
= glsl_align(offset
, member_align
);
6583 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6587 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6588 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6592 if (!qual
->flags
.q
.explicit_offset
) {
6593 if (align
!= 0 && size
!= 0)
6594 next_offset
= glsl_align(next_offset
+ size
, align
);
6597 /* Propogate row- / column-major information down the fields of the
6598 * structure or interface block. Structures need this data because
6599 * the structure may contain a structure that contains ... a matrix
6600 * that need the proper layout.
6603 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6604 (field_type
->without_array()->is_matrix()
6605 || field_type
->without_array()->is_record())) {
6606 /* If no layout is specified for the field, inherit the layout
6609 fields
[i
].matrix_layout
= matrix_layout
;
6611 if (qual
->flags
.q
.row_major
)
6612 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6613 else if (qual
->flags
.q
.column_major
)
6614 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6616 /* If we're processing an uniform or buffer block, the matrix
6617 * layout must be decided by this point.
6619 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6620 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6623 /* Image qualifiers are allowed on buffer variables, which can only
6624 * be defined inside shader storage buffer objects
6626 if (layout
&& var_mode
== ir_var_shader_storage
) {
6627 /* For readonly and writeonly qualifiers the field definition,
6628 * if set, overwrites the layout qualifier.
6630 if (qual
->flags
.q
.read_only
) {
6631 fields
[i
].image_read_only
= true;
6632 fields
[i
].image_write_only
= false;
6633 } else if (qual
->flags
.q
.write_only
) {
6634 fields
[i
].image_read_only
= false;
6635 fields
[i
].image_write_only
= true;
6637 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6638 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6641 /* For other qualifiers, we set the flag if either the layout
6642 * qualifier or the field qualifier are set
6644 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6645 layout
->flags
.q
.coherent
;
6646 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6647 layout
->flags
.q
._volatile
;
6648 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6649 layout
->flags
.q
.restrict_flag
;
6656 assert(i
== decl_count
);
6658 *fields_ret
= fields
;
6664 ast_struct_specifier::hir(exec_list
*instructions
,
6665 struct _mesa_glsl_parse_state
*state
)
6667 YYLTYPE loc
= this->get_location();
6669 unsigned expl_location
= 0;
6670 if (layout
&& layout
->flags
.q
.explicit_location
) {
6671 if (!process_qualifier_constant(state
, &loc
, "location",
6672 layout
->location
, &expl_location
)) {
6675 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6679 glsl_struct_field
*fields
;
6680 unsigned decl_count
=
6681 ast_process_struct_or_iface_block_members(instructions
,
6683 &this->declarations
,
6686 GLSL_MATRIX_LAYOUT_INHERITED
,
6687 false /* allow_reserved_names */,
6690 0, /* for interface only */
6692 0 /* for interface only */);
6694 validate_identifier(this->name
, loc
, state
);
6696 const glsl_type
*t
=
6697 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6699 if (!state
->symbols
->add_type(name
, t
)) {
6700 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6702 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6704 state
->num_user_structures
+ 1);
6706 s
[state
->num_user_structures
] = t
;
6707 state
->user_structures
= s
;
6708 state
->num_user_structures
++;
6712 /* Structure type definitions do not have r-values.
6719 * Visitor class which detects whether a given interface block has been used.
6721 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6724 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6725 : mode(mode
), block(block
), found(false)
6729 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6731 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6735 return visit_continue
;
6738 bool usage_found() const
6744 ir_variable_mode mode
;
6745 const glsl_type
*block
;
6750 is_unsized_array_last_element(ir_variable
*v
)
6752 const glsl_type
*interface_type
= v
->get_interface_type();
6753 int length
= interface_type
->length
;
6755 assert(v
->type
->is_unsized_array());
6757 /* Check if it is the last element of the interface */
6758 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6764 ast_interface_block::hir(exec_list
*instructions
,
6765 struct _mesa_glsl_parse_state
*state
)
6767 YYLTYPE loc
= this->get_location();
6769 /* Interface blocks must be declared at global scope */
6770 if (state
->current_function
!= NULL
) {
6771 _mesa_glsl_error(&loc
, state
,
6772 "Interface block `%s' must be declared "
6777 if (!this->layout
.flags
.q
.buffer
&&
6778 this->layout
.flags
.q
.std430
) {
6779 _mesa_glsl_error(&loc
, state
,
6780 "std430 storage block layout qualifier is supported "
6781 "only for shader storage blocks");
6784 /* The ast_interface_block has a list of ast_declarator_lists. We
6785 * need to turn those into ir_variables with an association
6786 * with this uniform block.
6788 enum glsl_interface_packing packing
;
6789 if (this->layout
.flags
.q
.shared
) {
6790 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6791 } else if (this->layout
.flags
.q
.packed
) {
6792 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6793 } else if (this->layout
.flags
.q
.std430
) {
6794 packing
= GLSL_INTERFACE_PACKING_STD430
;
6796 /* The default layout is std140.
6798 packing
= GLSL_INTERFACE_PACKING_STD140
;
6801 ir_variable_mode var_mode
;
6802 const char *iface_type_name
;
6803 if (this->layout
.flags
.q
.in
) {
6804 var_mode
= ir_var_shader_in
;
6805 iface_type_name
= "in";
6806 } else if (this->layout
.flags
.q
.out
) {
6807 var_mode
= ir_var_shader_out
;
6808 iface_type_name
= "out";
6809 } else if (this->layout
.flags
.q
.uniform
) {
6810 var_mode
= ir_var_uniform
;
6811 iface_type_name
= "uniform";
6812 } else if (this->layout
.flags
.q
.buffer
) {
6813 var_mode
= ir_var_shader_storage
;
6814 iface_type_name
= "buffer";
6816 var_mode
= ir_var_auto
;
6817 iface_type_name
= "UNKNOWN";
6818 assert(!"interface block layout qualifier not found!");
6821 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6822 if (this->layout
.flags
.q
.row_major
)
6823 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6824 else if (this->layout
.flags
.q
.column_major
)
6825 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6827 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6828 exec_list declared_variables
;
6829 glsl_struct_field
*fields
;
6831 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
6832 * that we don't have incompatible qualifiers
6834 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
6835 _mesa_glsl_error(&loc
, state
,
6836 "Interface block sets both readonly and writeonly");
6839 unsigned qual_stream
;
6840 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
6842 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
6843 /* If the stream qualifier is invalid it doesn't make sense to continue
6844 * on and try to compare stream layouts on member variables against it
6845 * so just return early.
6850 unsigned expl_location
= 0;
6851 if (layout
.flags
.q
.explicit_location
) {
6852 if (!process_qualifier_constant(state
, &loc
, "location",
6853 layout
.location
, &expl_location
)) {
6856 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6860 unsigned expl_align
= 0;
6861 if (layout
.flags
.q
.explicit_align
) {
6862 if (!process_qualifier_constant(state
, &loc
, "align",
6863 layout
.align
, &expl_align
)) {
6866 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
6867 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
6874 unsigned int num_variables
=
6875 ast_process_struct_or_iface_block_members(&declared_variables
,
6877 &this->declarations
,
6881 redeclaring_per_vertex
,
6888 if (!redeclaring_per_vertex
) {
6889 validate_identifier(this->block_name
, loc
, state
);
6891 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6893 * "Block names have no other use within a shader beyond interface
6894 * matching; it is a compile-time error to use a block name at global
6895 * scope for anything other than as a block name."
6897 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6898 if (var
&& !var
->type
->is_interface()) {
6899 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6900 "already used in the scope.",
6905 const glsl_type
*earlier_per_vertex
= NULL
;
6906 if (redeclaring_per_vertex
) {
6907 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6908 * the named interface block gl_in, we can find it by looking at the
6909 * previous declaration of gl_in. Otherwise we can find it by looking
6910 * at the previous decalartion of any of the built-in outputs,
6913 * Also check that the instance name and array-ness of the redeclaration
6917 case ir_var_shader_in
:
6918 if (ir_variable
*earlier_gl_in
=
6919 state
->symbols
->get_variable("gl_in")) {
6920 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6922 _mesa_glsl_error(&loc
, state
,
6923 "redeclaration of gl_PerVertex input not allowed "
6925 _mesa_shader_stage_to_string(state
->stage
));
6927 if (this->instance_name
== NULL
||
6928 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
6929 !this->array_specifier
->is_single_dimension()) {
6930 _mesa_glsl_error(&loc
, state
,
6931 "gl_PerVertex input must be redeclared as "
6935 case ir_var_shader_out
:
6936 if (ir_variable
*earlier_gl_Position
=
6937 state
->symbols
->get_variable("gl_Position")) {
6938 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6939 } else if (ir_variable
*earlier_gl_out
=
6940 state
->symbols
->get_variable("gl_out")) {
6941 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6943 _mesa_glsl_error(&loc
, state
,
6944 "redeclaration of gl_PerVertex output not "
6945 "allowed in the %s shader",
6946 _mesa_shader_stage_to_string(state
->stage
));
6948 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6949 if (this->instance_name
== NULL
||
6950 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6951 _mesa_glsl_error(&loc
, state
,
6952 "gl_PerVertex output must be redeclared as "
6956 if (this->instance_name
!= NULL
) {
6957 _mesa_glsl_error(&loc
, state
,
6958 "gl_PerVertex output may not be redeclared with "
6959 "an instance name");
6964 _mesa_glsl_error(&loc
, state
,
6965 "gl_PerVertex must be declared as an input or an "
6970 if (earlier_per_vertex
== NULL
) {
6971 /* An error has already been reported. Bail out to avoid null
6972 * dereferences later in this function.
6977 /* Copy locations from the old gl_PerVertex interface block. */
6978 for (unsigned i
= 0; i
< num_variables
; i
++) {
6979 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6981 _mesa_glsl_error(&loc
, state
,
6982 "redeclaration of gl_PerVertex must be a subset "
6983 "of the built-in members of gl_PerVertex");
6985 fields
[i
].location
=
6986 earlier_per_vertex
->fields
.structure
[j
].location
;
6988 earlier_per_vertex
->fields
.structure
[j
].offset
;
6989 fields
[i
].interpolation
=
6990 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6991 fields
[i
].centroid
=
6992 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6994 earlier_per_vertex
->fields
.structure
[j
].sample
;
6996 earlier_per_vertex
->fields
.structure
[j
].patch
;
6997 fields
[i
].precision
=
6998 earlier_per_vertex
->fields
.structure
[j
].precision
;
7002 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7005 * If a built-in interface block is redeclared, it must appear in
7006 * the shader before any use of any member included in the built-in
7007 * declaration, or a compilation error will result.
7009 * This appears to be a clarification to the behaviour established for
7010 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7011 * regardless of GLSL version.
7013 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7014 v
.run(instructions
);
7015 if (v
.usage_found()) {
7016 _mesa_glsl_error(&loc
, state
,
7017 "redeclaration of a built-in interface block must "
7018 "appear before any use of any member of the "
7023 const glsl_type
*block_type
=
7024 glsl_type::get_interface_instance(fields
,
7029 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7030 YYLTYPE loc
= this->get_location();
7031 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7032 "already taken in the current scope",
7033 this->block_name
, iface_type_name
);
7036 /* Since interface blocks cannot contain statements, it should be
7037 * impossible for the block to generate any instructions.
7039 assert(declared_variables
.is_empty());
7041 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7043 * Geometry shader input variables get the per-vertex values written
7044 * out by vertex shader output variables of the same names. Since a
7045 * geometry shader operates on a set of vertices, each input varying
7046 * variable (or input block, see interface blocks below) needs to be
7047 * declared as an array.
7049 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7050 var_mode
== ir_var_shader_in
) {
7051 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7052 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7053 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7054 this->array_specifier
== NULL
&&
7055 var_mode
== ir_var_shader_in
) {
7056 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7057 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7058 this->array_specifier
== NULL
&&
7059 var_mode
== ir_var_shader_out
) {
7060 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7064 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7067 * "If an instance name (instance-name) is used, then it puts all the
7068 * members inside a scope within its own name space, accessed with the
7069 * field selector ( . ) operator (analogously to structures)."
7071 if (this->instance_name
) {
7072 if (redeclaring_per_vertex
) {
7073 /* When a built-in in an unnamed interface block is redeclared,
7074 * get_variable_being_redeclared() calls
7075 * check_builtin_array_max_size() to make sure that built-in array
7076 * variables aren't redeclared to illegal sizes. But we're looking
7077 * at a redeclaration of a named built-in interface block. So we
7078 * have to manually call check_builtin_array_max_size() for all parts
7079 * of the interface that are arrays.
7081 for (unsigned i
= 0; i
< num_variables
; i
++) {
7082 if (fields
[i
].type
->is_array()) {
7083 const unsigned size
= fields
[i
].type
->array_size();
7084 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7088 validate_identifier(this->instance_name
, loc
, state
);
7093 if (this->array_specifier
!= NULL
) {
7094 const glsl_type
*block_array_type
=
7095 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7097 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7099 * For uniform blocks declared an array, each individual array
7100 * element corresponds to a separate buffer object backing one
7101 * instance of the block. As the array size indicates the number
7102 * of buffer objects needed, uniform block array declarations
7103 * must specify an array size.
7105 * And a few paragraphs later:
7107 * Geometry shader input blocks must be declared as arrays and
7108 * follow the array declaration and linking rules for all
7109 * geometry shader inputs. All other input and output block
7110 * arrays must specify an array size.
7112 * The same applies to tessellation shaders.
7114 * The upshot of this is that the only circumstance where an
7115 * interface array size *doesn't* need to be specified is on a
7116 * geometry shader input, tessellation control shader input,
7117 * tessellation control shader output, and tessellation evaluation
7120 if (block_array_type
->is_unsized_array()) {
7121 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7122 state
->stage
== MESA_SHADER_TESS_CTRL
||
7123 state
->stage
== MESA_SHADER_TESS_EVAL
;
7124 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7126 if (this->layout
.flags
.q
.in
) {
7128 _mesa_glsl_error(&loc
, state
,
7129 "unsized input block arrays not allowed in "
7131 _mesa_shader_stage_to_string(state
->stage
));
7132 } else if (this->layout
.flags
.q
.out
) {
7134 _mesa_glsl_error(&loc
, state
,
7135 "unsized output block arrays not allowed in "
7137 _mesa_shader_stage_to_string(state
->stage
));
7139 /* by elimination, this is a uniform block array */
7140 _mesa_glsl_error(&loc
, state
,
7141 "unsized uniform block arrays not allowed in "
7143 _mesa_shader_stage_to_string(state
->stage
));
7147 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7149 * * Arrays of arrays of blocks are not allowed
7151 if (state
->es_shader
&& block_array_type
->is_array() &&
7152 block_array_type
->fields
.array
->is_array()) {
7153 _mesa_glsl_error(&loc
, state
,
7154 "arrays of arrays interface blocks are "
7158 var
= new(state
) ir_variable(block_array_type
,
7159 this->instance_name
,
7162 var
= new(state
) ir_variable(block_type
,
7163 this->instance_name
,
7167 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7168 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7170 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7171 var
->data
.read_only
= true;
7173 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7174 handle_geometry_shader_input_decl(state
, loc
, var
);
7175 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7176 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7177 handle_tess_shader_input_decl(state
, loc
, var
);
7178 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7179 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7181 for (unsigned i
= 0; i
< num_variables
; i
++) {
7182 if (fields
[i
].type
->is_unsized_array()) {
7183 if (var_mode
== ir_var_shader_storage
) {
7184 if (i
!= (num_variables
- 1)) {
7185 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7186 "only last member of a shader storage block "
7187 "can be defined as unsized array",
7191 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7193 * "If an array is declared as the last member of a shader storage
7194 * block and the size is not specified at compile-time, it is
7195 * sized at run-time. In all other cases, arrays are sized only
7198 if (state
->es_shader
) {
7199 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7200 "only last member of a shader storage block "
7201 "can be defined as unsized array",
7208 if (ir_variable
*earlier
=
7209 state
->symbols
->get_variable(this->instance_name
)) {
7210 if (!redeclaring_per_vertex
) {
7211 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7212 this->instance_name
);
7214 earlier
->data
.how_declared
= ir_var_declared_normally
;
7215 earlier
->type
= var
->type
;
7216 earlier
->reinit_interface_type(block_type
);
7219 if (this->layout
.flags
.q
.explicit_binding
) {
7220 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7224 var
->data
.stream
= qual_stream
;
7225 if (layout
.flags
.q
.explicit_location
) {
7226 var
->data
.location
= expl_location
;
7227 var
->data
.explicit_location
= true;
7230 state
->symbols
->add_variable(var
);
7231 instructions
->push_tail(var
);
7234 /* In order to have an array size, the block must also be declared with
7237 assert(this->array_specifier
== NULL
);
7239 for (unsigned i
= 0; i
< num_variables
; i
++) {
7241 new(state
) ir_variable(fields
[i
].type
,
7242 ralloc_strdup(state
, fields
[i
].name
),
7244 var
->data
.interpolation
= fields
[i
].interpolation
;
7245 var
->data
.centroid
= fields
[i
].centroid
;
7246 var
->data
.sample
= fields
[i
].sample
;
7247 var
->data
.patch
= fields
[i
].patch
;
7248 var
->data
.stream
= qual_stream
;
7249 var
->data
.location
= fields
[i
].location
;
7250 if (fields
[i
].location
!= -1)
7251 var
->data
.explicit_location
= true;
7252 var
->init_interface_type(block_type
);
7254 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7255 var
->data
.read_only
= true;
7257 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7258 if (state
->es_shader
) {
7259 var
->data
.precision
=
7260 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7264 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7265 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7266 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7268 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7271 if (var
->data
.mode
== ir_var_shader_storage
) {
7272 var
->data
.image_read_only
= fields
[i
].image_read_only
;
7273 var
->data
.image_write_only
= fields
[i
].image_write_only
;
7274 var
->data
.image_coherent
= fields
[i
].image_coherent
;
7275 var
->data
.image_volatile
= fields
[i
].image_volatile
;
7276 var
->data
.image_restrict
= fields
[i
].image_restrict
;
7279 /* Examine var name here since var may get deleted in the next call */
7280 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7282 if (redeclaring_per_vertex
) {
7283 ir_variable
*earlier
=
7284 get_variable_being_redeclared(var
, loc
, state
,
7285 true /* allow_all_redeclarations */);
7286 if (!var_is_gl_id
|| earlier
== NULL
) {
7287 _mesa_glsl_error(&loc
, state
,
7288 "redeclaration of gl_PerVertex can only "
7289 "include built-in variables");
7290 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7291 _mesa_glsl_error(&loc
, state
,
7292 "`%s' has already been redeclared",
7295 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7296 earlier
->reinit_interface_type(block_type
);
7301 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7302 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7304 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7305 * The UBO declaration itself doesn't get an ir_variable unless it
7306 * has an instance name. This is ugly.
7308 if (this->layout
.flags
.q
.explicit_binding
) {
7309 apply_explicit_binding(state
, &loc
, var
,
7310 var
->get_interface_type(), &this->layout
);
7313 if (var
->type
->is_unsized_array()) {
7314 if (var
->is_in_shader_storage_block()) {
7315 if (!is_unsized_array_last_element(var
)) {
7316 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7317 "only last member of a shader storage block "
7318 "can be defined as unsized array",
7321 var
->data
.from_ssbo_unsized_array
= true;
7323 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7325 * "If an array is declared as the last member of a shader storage
7326 * block and the size is not specified at compile-time, it is
7327 * sized at run-time. In all other cases, arrays are sized only
7330 if (state
->es_shader
) {
7331 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7332 "only last member of a shader storage block "
7333 "can be defined as unsized array",
7339 state
->symbols
->add_variable(var
);
7340 instructions
->push_tail(var
);
7343 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7344 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7346 * It is also a compilation error ... to redeclare a built-in
7347 * block and then use a member from that built-in block that was
7348 * not included in the redeclaration.
7350 * This appears to be a clarification to the behaviour established
7351 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7352 * behaviour regardless of GLSL version.
7354 * To prevent the shader from using a member that was not included in
7355 * the redeclaration, we disable any ir_variables that are still
7356 * associated with the old declaration of gl_PerVertex (since we've
7357 * already updated all of the variables contained in the new
7358 * gl_PerVertex to point to it).
7360 * As a side effect this will prevent
7361 * validate_intrastage_interface_blocks() from getting confused and
7362 * thinking there are conflicting definitions of gl_PerVertex in the
7365 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7366 ir_variable
*const var
= node
->as_variable();
7368 var
->get_interface_type() == earlier_per_vertex
&&
7369 var
->data
.mode
== var_mode
) {
7370 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7371 _mesa_glsl_error(&loc
, state
,
7372 "redeclaration of gl_PerVertex cannot "
7373 "follow a redeclaration of `%s'",
7376 state
->symbols
->disable_variable(var
->name
);
7388 ast_tcs_output_layout::hir(exec_list
*instructions
,
7389 struct _mesa_glsl_parse_state
*state
)
7391 YYLTYPE loc
= this->get_location();
7393 unsigned num_vertices
;
7394 if (!state
->out_qualifier
->vertices
->
7395 process_qualifier_constant(state
, "vertices", &num_vertices
,
7397 /* return here to stop cascading incorrect error messages */
7401 /* If any shader outputs occurred before this declaration and specified an
7402 * array size, make sure the size they specified is consistent with the
7405 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7406 _mesa_glsl_error(&loc
, state
,
7407 "this tessellation control shader output layout "
7408 "specifies %u vertices, but a previous output "
7409 "is declared with size %u",
7410 num_vertices
, state
->tcs_output_size
);
7414 state
->tcs_output_vertices_specified
= true;
7416 /* If any shader outputs occurred before this declaration and did not
7417 * specify an array size, their size is determined now.
7419 foreach_in_list (ir_instruction
, node
, instructions
) {
7420 ir_variable
*var
= node
->as_variable();
7421 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7424 /* Note: Not all tessellation control shader output are arrays. */
7425 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7428 if (var
->data
.max_array_access
>= num_vertices
) {
7429 _mesa_glsl_error(&loc
, state
,
7430 "this tessellation control shader output layout "
7431 "specifies %u vertices, but an access to element "
7432 "%u of output `%s' already exists", num_vertices
,
7433 var
->data
.max_array_access
, var
->name
);
7435 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7445 ast_gs_input_layout::hir(exec_list
*instructions
,
7446 struct _mesa_glsl_parse_state
*state
)
7448 YYLTYPE loc
= this->get_location();
7450 /* If any geometry input layout declaration preceded this one, make sure it
7451 * was consistent with this one.
7453 if (state
->gs_input_prim_type_specified
&&
7454 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7455 _mesa_glsl_error(&loc
, state
,
7456 "geometry shader input layout does not match"
7457 " previous declaration");
7461 /* If any shader inputs occurred before this declaration and specified an
7462 * array size, make sure the size they specified is consistent with the
7465 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7466 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7467 _mesa_glsl_error(&loc
, state
,
7468 "this geometry shader input layout implies %u vertices"
7469 " per primitive, but a previous input is declared"
7470 " with size %u", num_vertices
, state
->gs_input_size
);
7474 state
->gs_input_prim_type_specified
= true;
7476 /* If any shader inputs occurred before this declaration and did not
7477 * specify an array size, their size is determined now.
7479 foreach_in_list(ir_instruction
, node
, instructions
) {
7480 ir_variable
*var
= node
->as_variable();
7481 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7484 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7488 if (var
->type
->is_unsized_array()) {
7489 if (var
->data
.max_array_access
>= num_vertices
) {
7490 _mesa_glsl_error(&loc
, state
,
7491 "this geometry shader input layout implies %u"
7492 " vertices, but an access to element %u of input"
7493 " `%s' already exists", num_vertices
,
7494 var
->data
.max_array_access
, var
->name
);
7496 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7507 ast_cs_input_layout::hir(exec_list
*instructions
,
7508 struct _mesa_glsl_parse_state
*state
)
7510 YYLTYPE loc
= this->get_location();
7512 /* From the ARB_compute_shader specification:
7514 * If the local size of the shader in any dimension is greater
7515 * than the maximum size supported by the implementation for that
7516 * dimension, a compile-time error results.
7518 * It is not clear from the spec how the error should be reported if
7519 * the total size of the work group exceeds
7520 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7521 * report it at compile time as well.
7523 GLuint64 total_invocations
= 1;
7524 unsigned qual_local_size
[3];
7525 for (int i
= 0; i
< 3; i
++) {
7527 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7529 /* Infer a local_size of 1 for unspecified dimensions */
7530 if (this->local_size
[i
] == NULL
) {
7531 qual_local_size
[i
] = 1;
7532 } else if (!this->local_size
[i
]->
7533 process_qualifier_constant(state
, local_size_str
,
7534 &qual_local_size
[i
], false)) {
7535 ralloc_free(local_size_str
);
7538 ralloc_free(local_size_str
);
7540 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7541 _mesa_glsl_error(&loc
, state
,
7542 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7544 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7547 total_invocations
*= qual_local_size
[i
];
7548 if (total_invocations
>
7549 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7550 _mesa_glsl_error(&loc
, state
,
7551 "product of local_sizes exceeds "
7552 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7553 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7558 /* If any compute input layout declaration preceded this one, make sure it
7559 * was consistent with this one.
7561 if (state
->cs_input_local_size_specified
) {
7562 for (int i
= 0; i
< 3; i
++) {
7563 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7564 _mesa_glsl_error(&loc
, state
,
7565 "compute shader input layout does not match"
7566 " previous declaration");
7572 state
->cs_input_local_size_specified
= true;
7573 for (int i
= 0; i
< 3; i
++)
7574 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7576 /* We may now declare the built-in constant gl_WorkGroupSize (see
7577 * builtin_variable_generator::generate_constants() for why we didn't
7578 * declare it earlier).
7580 ir_variable
*var
= new(state
->symbols
)
7581 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7582 var
->data
.how_declared
= ir_var_declared_implicitly
;
7583 var
->data
.read_only
= true;
7584 instructions
->push_tail(var
);
7585 state
->symbols
->add_variable(var
);
7586 ir_constant_data data
;
7587 memset(&data
, 0, sizeof(data
));
7588 for (int i
= 0; i
< 3; i
++)
7589 data
.u
[i
] = qual_local_size
[i
];
7590 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7591 var
->constant_initializer
=
7592 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7593 var
->data
.has_initializer
= true;
7600 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7601 exec_list
*instructions
)
7603 bool gl_FragColor_assigned
= false;
7604 bool gl_FragData_assigned
= false;
7605 bool gl_FragSecondaryColor_assigned
= false;
7606 bool gl_FragSecondaryData_assigned
= false;
7607 bool user_defined_fs_output_assigned
= false;
7608 ir_variable
*user_defined_fs_output
= NULL
;
7610 /* It would be nice to have proper location information. */
7612 memset(&loc
, 0, sizeof(loc
));
7614 foreach_in_list(ir_instruction
, node
, instructions
) {
7615 ir_variable
*var
= node
->as_variable();
7617 if (!var
|| !var
->data
.assigned
)
7620 if (strcmp(var
->name
, "gl_FragColor") == 0)
7621 gl_FragColor_assigned
= true;
7622 else if (strcmp(var
->name
, "gl_FragData") == 0)
7623 gl_FragData_assigned
= true;
7624 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7625 gl_FragSecondaryColor_assigned
= true;
7626 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7627 gl_FragSecondaryData_assigned
= true;
7628 else if (!is_gl_identifier(var
->name
)) {
7629 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7630 var
->data
.mode
== ir_var_shader_out
) {
7631 user_defined_fs_output_assigned
= true;
7632 user_defined_fs_output
= var
;
7637 /* From the GLSL 1.30 spec:
7639 * "If a shader statically assigns a value to gl_FragColor, it
7640 * may not assign a value to any element of gl_FragData. If a
7641 * shader statically writes a value to any element of
7642 * gl_FragData, it may not assign a value to
7643 * gl_FragColor. That is, a shader may assign values to either
7644 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7645 * linked together must also consistently write just one of
7646 * these variables. Similarly, if user declared output
7647 * variables are in use (statically assigned to), then the
7648 * built-in variables gl_FragColor and gl_FragData may not be
7649 * assigned to. These incorrect usages all generate compile
7652 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7653 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7654 "`gl_FragColor' and `gl_FragData'");
7655 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7656 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7657 "`gl_FragColor' and `%s'",
7658 user_defined_fs_output
->name
);
7659 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7660 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7661 "`gl_FragSecondaryColorEXT' and"
7662 " `gl_FragSecondaryDataEXT'");
7663 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7664 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7665 "`gl_FragColor' and"
7666 " `gl_FragSecondaryDataEXT'");
7667 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7668 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7670 " `gl_FragSecondaryColorEXT'");
7671 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7672 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7673 "`gl_FragData' and `%s'",
7674 user_defined_fs_output
->name
);
7677 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7678 !state
->EXT_blend_func_extended_enable
) {
7679 _mesa_glsl_error(&loc
, state
,
7680 "Dual source blending requires EXT_blend_func_extended");
7686 remove_per_vertex_blocks(exec_list
*instructions
,
7687 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7689 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7690 * if it exists in this shader type.
7692 const glsl_type
*per_vertex
= NULL
;
7694 case ir_var_shader_in
:
7695 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7696 per_vertex
= gl_in
->get_interface_type();
7698 case ir_var_shader_out
:
7699 if (ir_variable
*gl_Position
=
7700 state
->symbols
->get_variable("gl_Position")) {
7701 per_vertex
= gl_Position
->get_interface_type();
7705 assert(!"Unexpected mode");
7709 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7710 * need to do anything.
7712 if (per_vertex
== NULL
)
7715 /* If the interface block is used by the shader, then we don't need to do
7718 interface_block_usage_visitor
v(mode
, per_vertex
);
7719 v
.run(instructions
);
7720 if (v
.usage_found())
7723 /* Remove any ir_variable declarations that refer to the interface block
7726 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7727 ir_variable
*const var
= node
->as_variable();
7728 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
7729 var
->data
.mode
== mode
) {
7730 state
->symbols
->disable_variable(var
->name
);