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
) {
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::do_hir(exec_list
*instructions
,
1253 struct _mesa_glsl_parse_state
*state
,
1257 static const int operations
[AST_NUM_OPERATORS
] = {
1258 -1, /* ast_assign doesn't convert to ir_expression. */
1259 -1, /* ast_plus doesn't convert to ir_expression. */
1273 ir_binop_any_nequal
,
1283 /* Note: The following block of expression types actually convert
1284 * to multiple IR instructions.
1286 ir_binop_mul
, /* ast_mul_assign */
1287 ir_binop_div
, /* ast_div_assign */
1288 ir_binop_mod
, /* ast_mod_assign */
1289 ir_binop_add
, /* ast_add_assign */
1290 ir_binop_sub
, /* ast_sub_assign */
1291 ir_binop_lshift
, /* ast_ls_assign */
1292 ir_binop_rshift
, /* ast_rs_assign */
1293 ir_binop_bit_and
, /* ast_and_assign */
1294 ir_binop_bit_xor
, /* ast_xor_assign */
1295 ir_binop_bit_or
, /* ast_or_assign */
1297 -1, /* ast_conditional doesn't convert to ir_expression. */
1298 ir_binop_add
, /* ast_pre_inc. */
1299 ir_binop_sub
, /* ast_pre_dec. */
1300 ir_binop_add
, /* ast_post_inc. */
1301 ir_binop_sub
, /* ast_post_dec. */
1302 -1, /* ast_field_selection doesn't conv to ir_expression. */
1303 -1, /* ast_array_index doesn't convert to ir_expression. */
1304 -1, /* ast_function_call doesn't conv to ir_expression. */
1305 -1, /* ast_identifier doesn't convert to ir_expression. */
1306 -1, /* ast_int_constant doesn't convert to ir_expression. */
1307 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1308 -1, /* ast_float_constant doesn't conv to ir_expression. */
1309 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1310 -1, /* ast_sequence doesn't convert to ir_expression. */
1312 ir_rvalue
*result
= NULL
;
1314 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1315 bool error_emitted
= false;
1318 loc
= this->get_location();
1320 switch (this->oper
) {
1322 assert(!"ast_aggregate: Should never get here.");
1326 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1327 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1330 do_assignment(instructions
, state
,
1331 this->subexpressions
[0]->non_lvalue_description
,
1332 op
[0], op
[1], &result
, needs_rvalue
, false,
1333 this->subexpressions
[0]->get_location());
1338 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1340 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1342 error_emitted
= type
->is_error();
1348 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1350 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1352 error_emitted
= type
->is_error();
1354 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1362 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1363 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1365 type
= arithmetic_result_type(op
[0], op
[1],
1366 (this->oper
== ast_mul
),
1368 error_emitted
= type
->is_error();
1370 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1375 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1376 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1378 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1380 assert(operations
[this->oper
] == ir_binop_mod
);
1382 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1384 error_emitted
= type
->is_error();
1389 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1390 error_emitted
= true;
1393 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1394 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1395 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1397 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1399 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1406 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1407 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1409 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1411 /* The relational operators must either generate an error or result
1412 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1414 assert(type
->is_error()
1415 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1416 && type
->is_scalar()));
1418 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1420 error_emitted
= type
->is_error();
1425 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1426 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1428 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1430 * "The equality operators equal (==), and not equal (!=)
1431 * operate on all types. They result in a scalar Boolean. If
1432 * the operand types do not match, then there must be a
1433 * conversion from Section 4.1.10 "Implicit Conversions"
1434 * applied to one operand that can make them match, in which
1435 * case this conversion is done."
1438 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1439 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1440 "no operation `%1$s' exists that takes a left-hand "
1441 "operand of type 'void' or a right operand of type "
1442 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1443 error_emitted
= true;
1444 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1445 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1446 || (op
[0]->type
!= op
[1]->type
)) {
1447 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1448 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1449 error_emitted
= true;
1450 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1451 !state
->check_version(120, 300, &loc
,
1452 "array comparisons forbidden")) {
1453 error_emitted
= true;
1454 } else if ((op
[0]->type
->contains_opaque() ||
1455 op
[1]->type
->contains_opaque())) {
1456 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1457 error_emitted
= true;
1460 if (error_emitted
) {
1461 result
= new(ctx
) ir_constant(false);
1463 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1464 assert(result
->type
== glsl_type::bool_type
);
1471 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1472 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1473 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1474 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1476 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1480 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1482 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1483 error_emitted
= true;
1486 if (!op
[0]->type
->is_integer()) {
1487 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1488 error_emitted
= true;
1491 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1492 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1495 case ast_logic_and
: {
1496 exec_list rhs_instructions
;
1497 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1498 "LHS", &error_emitted
);
1499 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1500 "RHS", &error_emitted
);
1502 if (rhs_instructions
.is_empty()) {
1503 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1504 type
= result
->type
;
1506 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1509 instructions
->push_tail(tmp
);
1511 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1512 instructions
->push_tail(stmt
);
1514 stmt
->then_instructions
.append_list(&rhs_instructions
);
1515 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1516 ir_assignment
*const then_assign
=
1517 new(ctx
) ir_assignment(then_deref
, op
[1]);
1518 stmt
->then_instructions
.push_tail(then_assign
);
1520 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1521 ir_assignment
*const else_assign
=
1522 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1523 stmt
->else_instructions
.push_tail(else_assign
);
1525 result
= new(ctx
) ir_dereference_variable(tmp
);
1531 case ast_logic_or
: {
1532 exec_list rhs_instructions
;
1533 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1534 "LHS", &error_emitted
);
1535 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1536 "RHS", &error_emitted
);
1538 if (rhs_instructions
.is_empty()) {
1539 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1540 type
= result
->type
;
1542 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1545 instructions
->push_tail(tmp
);
1547 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1548 instructions
->push_tail(stmt
);
1550 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1551 ir_assignment
*const then_assign
=
1552 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1553 stmt
->then_instructions
.push_tail(then_assign
);
1555 stmt
->else_instructions
.append_list(&rhs_instructions
);
1556 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1557 ir_assignment
*const else_assign
=
1558 new(ctx
) ir_assignment(else_deref
, op
[1]);
1559 stmt
->else_instructions
.push_tail(else_assign
);
1561 result
= new(ctx
) ir_dereference_variable(tmp
);
1568 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1570 * "The logical binary operators and (&&), or ( | | ), and
1571 * exclusive or (^^). They operate only on two Boolean
1572 * expressions and result in a Boolean expression."
1574 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1576 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1579 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1584 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1585 "operand", &error_emitted
);
1587 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1591 case ast_mul_assign
:
1592 case ast_div_assign
:
1593 case ast_add_assign
:
1594 case ast_sub_assign
: {
1595 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1596 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1598 type
= arithmetic_result_type(op
[0], op
[1],
1599 (this->oper
== ast_mul_assign
),
1602 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1606 do_assignment(instructions
, state
,
1607 this->subexpressions
[0]->non_lvalue_description
,
1608 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1609 &result
, needs_rvalue
, false,
1610 this->subexpressions
[0]->get_location());
1612 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1613 * explicitly test for this because none of the binary expression
1614 * operators allow array operands either.
1620 case ast_mod_assign
: {
1621 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1622 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1624 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1626 assert(operations
[this->oper
] == ir_binop_mod
);
1628 ir_rvalue
*temp_rhs
;
1629 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1633 do_assignment(instructions
, state
,
1634 this->subexpressions
[0]->non_lvalue_description
,
1635 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1636 &result
, needs_rvalue
, false,
1637 this->subexpressions
[0]->get_location());
1642 case ast_rs_assign
: {
1643 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1644 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1645 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1647 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1648 type
, op
[0], op
[1]);
1650 do_assignment(instructions
, state
,
1651 this->subexpressions
[0]->non_lvalue_description
,
1652 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1653 &result
, needs_rvalue
, false,
1654 this->subexpressions
[0]->get_location());
1658 case ast_and_assign
:
1659 case ast_xor_assign
:
1660 case ast_or_assign
: {
1661 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1662 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1663 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1664 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1665 type
, op
[0], op
[1]);
1667 do_assignment(instructions
, state
,
1668 this->subexpressions
[0]->non_lvalue_description
,
1669 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1670 &result
, needs_rvalue
, false,
1671 this->subexpressions
[0]->get_location());
1675 case ast_conditional
: {
1676 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1678 * "The ternary selection operator (?:). It operates on three
1679 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1680 * first expression, which must result in a scalar Boolean."
1682 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1683 "condition", &error_emitted
);
1685 /* The :? operator is implemented by generating an anonymous temporary
1686 * followed by an if-statement. The last instruction in each branch of
1687 * the if-statement assigns a value to the anonymous temporary. This
1688 * temporary is the r-value of the expression.
1690 exec_list then_instructions
;
1691 exec_list else_instructions
;
1693 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1694 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1696 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1698 * "The second and third expressions can be any type, as
1699 * long their types match, or there is a conversion in
1700 * Section 4.1.10 "Implicit Conversions" that can be applied
1701 * to one of the expressions to make their types match. This
1702 * resulting matching type is the type of the entire
1705 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1706 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1707 || (op
[1]->type
!= op
[2]->type
)) {
1708 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1710 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1711 "operator must have matching types");
1712 error_emitted
= true;
1713 type
= glsl_type::error_type
;
1718 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1720 * "The second and third expressions must be the same type, but can
1721 * be of any type other than an array."
1723 if (type
->is_array() &&
1724 !state
->check_version(120, 300, &loc
,
1725 "second and third operands of ?: operator "
1726 "cannot be arrays")) {
1727 error_emitted
= true;
1730 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1732 * "Except for array indexing, structure member selection, and
1733 * parentheses, opaque variables are not allowed to be operands in
1734 * expressions; such use results in a compile-time error."
1736 if (type
->contains_opaque()) {
1737 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1738 "of the ?: operator");
1739 error_emitted
= true;
1742 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1744 if (then_instructions
.is_empty()
1745 && else_instructions
.is_empty()
1746 && cond_val
!= NULL
) {
1747 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1749 /* The copy to conditional_tmp reads the whole array. */
1750 if (type
->is_array()) {
1751 mark_whole_array_access(op
[1]);
1752 mark_whole_array_access(op
[2]);
1755 ir_variable
*const tmp
=
1756 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1757 instructions
->push_tail(tmp
);
1759 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1760 instructions
->push_tail(stmt
);
1762 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1763 ir_dereference
*const then_deref
=
1764 new(ctx
) ir_dereference_variable(tmp
);
1765 ir_assignment
*const then_assign
=
1766 new(ctx
) ir_assignment(then_deref
, op
[1]);
1767 stmt
->then_instructions
.push_tail(then_assign
);
1769 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1770 ir_dereference
*const else_deref
=
1771 new(ctx
) ir_dereference_variable(tmp
);
1772 ir_assignment
*const else_assign
=
1773 new(ctx
) ir_assignment(else_deref
, op
[2]);
1774 stmt
->else_instructions
.push_tail(else_assign
);
1776 result
= new(ctx
) ir_dereference_variable(tmp
);
1783 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1784 ? "pre-increment operation" : "pre-decrement operation";
1786 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1787 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1789 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1791 ir_rvalue
*temp_rhs
;
1792 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1796 do_assignment(instructions
, state
,
1797 this->subexpressions
[0]->non_lvalue_description
,
1798 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1799 &result
, needs_rvalue
, false,
1800 this->subexpressions
[0]->get_location());
1805 case ast_post_dec
: {
1806 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1807 ? "post-increment operation" : "post-decrement operation";
1808 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1809 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1811 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1813 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1815 ir_rvalue
*temp_rhs
;
1816 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1819 /* Get a temporary of a copy of the lvalue before it's modified.
1820 * This may get thrown away later.
1822 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1824 ir_rvalue
*junk_rvalue
;
1826 do_assignment(instructions
, state
,
1827 this->subexpressions
[0]->non_lvalue_description
,
1828 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1829 &junk_rvalue
, false, false,
1830 this->subexpressions
[0]->get_location());
1835 case ast_field_selection
:
1836 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1839 case ast_array_index
: {
1840 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1842 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1843 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1845 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1848 if (result
->type
->is_error())
1849 error_emitted
= true;
1854 case ast_unsized_array_dim
:
1855 assert(!"ast_unsized_array_dim: Should never get here.");
1858 case ast_function_call
:
1859 /* Should *NEVER* get here. ast_function_call should always be handled
1860 * by ast_function_expression::hir.
1865 case ast_identifier
: {
1866 /* ast_identifier can appear several places in a full abstract syntax
1867 * tree. This particular use must be at location specified in the grammar
1868 * as 'variable_identifier'.
1871 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1874 var
->data
.used
= true;
1875 result
= new(ctx
) ir_dereference_variable(var
);
1877 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1878 this->primary_expression
.identifier
);
1880 result
= ir_rvalue::error_value(ctx
);
1881 error_emitted
= true;
1886 case ast_int_constant
:
1887 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1890 case ast_uint_constant
:
1891 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1894 case ast_float_constant
:
1895 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1898 case ast_bool_constant
:
1899 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1902 case ast_double_constant
:
1903 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1906 case ast_sequence
: {
1907 /* It should not be possible to generate a sequence in the AST without
1908 * any expressions in it.
1910 assert(!this->expressions
.is_empty());
1912 /* The r-value of a sequence is the last expression in the sequence. If
1913 * the other expressions in the sequence do not have side-effects (and
1914 * therefore add instructions to the instruction list), they get dropped
1917 exec_node
*previous_tail_pred
= NULL
;
1918 YYLTYPE previous_operand_loc
= loc
;
1920 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1921 /* If one of the operands of comma operator does not generate any
1922 * code, we want to emit a warning. At each pass through the loop
1923 * previous_tail_pred will point to the last instruction in the
1924 * stream *before* processing the previous operand. Naturally,
1925 * instructions->tail_pred will point to the last instruction in the
1926 * stream *after* processing the previous operand. If the two
1927 * pointers match, then the previous operand had no effect.
1929 * The warning behavior here differs slightly from GCC. GCC will
1930 * only emit a warning if none of the left-hand operands have an
1931 * effect. However, it will emit a warning for each. I believe that
1932 * there are some cases in C (especially with GCC extensions) where
1933 * it is useful to have an intermediate step in a sequence have no
1934 * effect, but I don't think these cases exist in GLSL. Either way,
1935 * it would be a giant hassle to replicate that behavior.
1937 if (previous_tail_pred
== instructions
->tail_pred
) {
1938 _mesa_glsl_warning(&previous_operand_loc
, state
,
1939 "left-hand operand of comma expression has "
1943 /* tail_pred is directly accessed instead of using the get_tail()
1944 * method for performance reasons. get_tail() has extra code to
1945 * return NULL when the list is empty. We don't care about that
1946 * here, so using tail_pred directly is fine.
1948 previous_tail_pred
= instructions
->tail_pred
;
1949 previous_operand_loc
= ast
->get_location();
1951 result
= ast
->hir(instructions
, state
);
1954 /* Any errors should have already been emitted in the loop above.
1956 error_emitted
= true;
1960 type
= NULL
; /* use result->type, not type. */
1961 assert(result
!= NULL
|| !needs_rvalue
);
1963 if (result
&& result
->type
->is_error() && !error_emitted
)
1964 _mesa_glsl_error(& loc
, state
, "type mismatch");
1970 ast_expression::has_sequence_subexpression() const
1972 switch (this->oper
) {
1981 return this->subexpressions
[0]->has_sequence_subexpression();
2003 case ast_array_index
:
2004 case ast_mul_assign
:
2005 case ast_div_assign
:
2006 case ast_add_assign
:
2007 case ast_sub_assign
:
2008 case ast_mod_assign
:
2011 case ast_and_assign
:
2012 case ast_xor_assign
:
2014 return this->subexpressions
[0]->has_sequence_subexpression() ||
2015 this->subexpressions
[1]->has_sequence_subexpression();
2017 case ast_conditional
:
2018 return this->subexpressions
[0]->has_sequence_subexpression() ||
2019 this->subexpressions
[1]->has_sequence_subexpression() ||
2020 this->subexpressions
[2]->has_sequence_subexpression();
2025 case ast_field_selection
:
2026 case ast_identifier
:
2027 case ast_int_constant
:
2028 case ast_uint_constant
:
2029 case ast_float_constant
:
2030 case ast_bool_constant
:
2031 case ast_double_constant
:
2035 unreachable("ast_aggregate: Should never get here.");
2037 case ast_function_call
:
2038 unreachable("should be handled by ast_function_expression::hir");
2040 case ast_unsized_array_dim
:
2041 unreachable("ast_unsized_array_dim: Should never get here.");
2048 ast_expression_statement::hir(exec_list
*instructions
,
2049 struct _mesa_glsl_parse_state
*state
)
2051 /* It is possible to have expression statements that don't have an
2052 * expression. This is the solitary semicolon:
2054 * for (i = 0; i < 5; i++)
2057 * In this case the expression will be NULL. Test for NULL and don't do
2058 * anything in that case.
2060 if (expression
!= NULL
)
2061 expression
->hir_no_rvalue(instructions
, state
);
2063 /* Statements do not have r-values.
2070 ast_compound_statement::hir(exec_list
*instructions
,
2071 struct _mesa_glsl_parse_state
*state
)
2074 state
->symbols
->push_scope();
2076 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2077 ast
->hir(instructions
, state
);
2080 state
->symbols
->pop_scope();
2082 /* Compound statements do not have r-values.
2088 * Evaluate the given exec_node (which should be an ast_node representing
2089 * a single array dimension) and return its integer value.
2092 process_array_size(exec_node
*node
,
2093 struct _mesa_glsl_parse_state
*state
)
2095 exec_list dummy_instructions
;
2097 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2100 * Dimensions other than the outermost dimension can by unsized if they
2101 * are immediately sized by a constructor or initializer.
2103 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2106 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2107 YYLTYPE loc
= array_size
->get_location();
2110 _mesa_glsl_error(& loc
, state
,
2111 "array size could not be resolved");
2115 if (!ir
->type
->is_integer()) {
2116 _mesa_glsl_error(& loc
, state
,
2117 "array size must be integer type");
2121 if (!ir
->type
->is_scalar()) {
2122 _mesa_glsl_error(& loc
, state
,
2123 "array size must be scalar type");
2127 ir_constant
*const size
= ir
->constant_expression_value();
2129 (state
->is_version(120, 300) &&
2130 array_size
->has_sequence_subexpression())) {
2131 _mesa_glsl_error(& loc
, state
, "array size must be a "
2132 "constant valued expression");
2136 if (size
->value
.i
[0] <= 0) {
2137 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2141 assert(size
->type
== ir
->type
);
2143 /* If the array size is const (and we've verified that
2144 * it is) then no instructions should have been emitted
2145 * when we converted it to HIR. If they were emitted,
2146 * then either the array size isn't const after all, or
2147 * we are emitting unnecessary instructions.
2149 assert(dummy_instructions
.is_empty());
2151 return size
->value
.u
[0];
2154 static const glsl_type
*
2155 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2156 ast_array_specifier
*array_specifier
,
2157 struct _mesa_glsl_parse_state
*state
)
2159 const glsl_type
*array_type
= base
;
2161 if (array_specifier
!= NULL
) {
2162 if (base
->is_array()) {
2164 /* From page 19 (page 25) of the GLSL 1.20 spec:
2166 * "Only one-dimensional arrays may be declared."
2168 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2169 return glsl_type::error_type
;
2173 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2174 !node
->is_head_sentinel(); node
= node
->prev
) {
2175 unsigned array_size
= process_array_size(node
, state
);
2176 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2184 precision_qualifier_allowed(const glsl_type
*type
)
2186 /* Precision qualifiers apply to floating point, integer and opaque
2189 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2190 * "Any floating point or any integer declaration can have the type
2191 * preceded by one of these precision qualifiers [...] Literal
2192 * constants do not have precision qualifiers. Neither do Boolean
2195 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2198 * "Precision qualifiers are added for code portability with OpenGL
2199 * ES, not for functionality. They have the same syntax as in OpenGL
2202 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2204 * "uniform lowp sampler2D sampler;
2207 * lowp vec4 col = texture2D (sampler, coord);
2208 * // texture2D returns lowp"
2210 * From this, we infer that GLSL 1.30 (and later) should allow precision
2211 * qualifiers on sampler types just like float and integer types.
2213 return (type
->is_float()
2214 || type
->is_integer()
2215 || type
->contains_opaque())
2216 && !type
->without_array()->is_record();
2220 ast_type_specifier::glsl_type(const char **name
,
2221 struct _mesa_glsl_parse_state
*state
) const
2223 const struct glsl_type
*type
;
2225 type
= state
->symbols
->get_type(this->type_name
);
2226 *name
= this->type_name
;
2228 YYLTYPE loc
= this->get_location();
2229 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2235 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2237 * "The precision statement
2239 * precision precision-qualifier type;
2241 * can be used to establish a default precision qualifier. The type field can
2242 * be either int or float or any of the sampler types, (...) If type is float,
2243 * the directive applies to non-precision-qualified floating point type
2244 * (scalar, vector, and matrix) declarations. If type is int, the directive
2245 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2246 * and unsigned) declarations."
2248 * We use the symbol table to keep the values of the default precisions for
2249 * each 'type' in each scope and we use the 'type' string from the precision
2250 * statement as key in the symbol table. When we want to retrieve the default
2251 * precision associated with a given glsl_type we need to know the type string
2252 * associated with it. This is what this function returns.
2255 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2257 switch (type
->base_type
) {
2258 case GLSL_TYPE_FLOAT
:
2260 case GLSL_TYPE_UINT
:
2263 case GLSL_TYPE_ATOMIC_UINT
:
2264 return "atomic_uint";
2265 case GLSL_TYPE_IMAGE
:
2267 case GLSL_TYPE_SAMPLER
: {
2268 const unsigned type_idx
=
2269 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2270 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2271 assert(type_idx
< 4);
2272 switch (type
->sampled_type
) {
2273 case GLSL_TYPE_FLOAT
:
2274 switch (type
->sampler_dimensionality
) {
2275 case GLSL_SAMPLER_DIM_1D
: {
2276 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2277 static const char *const names
[4] = {
2278 "sampler1D", "sampler1DArray",
2279 "sampler1DShadow", "sampler1DArrayShadow"
2281 return names
[type_idx
];
2283 case GLSL_SAMPLER_DIM_2D
: {
2284 static const char *const names
[8] = {
2285 "sampler2D", "sampler2DArray",
2286 "sampler2DShadow", "sampler2DArrayShadow",
2287 "image2D", "image2DArray", NULL
, NULL
2289 return names
[offset
+ type_idx
];
2291 case GLSL_SAMPLER_DIM_3D
: {
2292 static const char *const names
[8] = {
2293 "sampler3D", NULL
, NULL
, NULL
,
2294 "image3D", NULL
, NULL
, NULL
2296 return names
[offset
+ type_idx
];
2298 case GLSL_SAMPLER_DIM_CUBE
: {
2299 static const char *const names
[8] = {
2300 "samplerCube", "samplerCubeArray",
2301 "samplerCubeShadow", "samplerCubeArrayShadow",
2302 "imageCube", NULL
, NULL
, NULL
2304 return names
[offset
+ type_idx
];
2306 case GLSL_SAMPLER_DIM_MS
: {
2307 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2308 static const char *const names
[4] = {
2309 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2311 return names
[type_idx
];
2313 case GLSL_SAMPLER_DIM_RECT
: {
2314 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2315 static const char *const names
[4] = {
2316 "samplerRect", NULL
, "samplerRectShadow", NULL
2318 return names
[type_idx
];
2320 case GLSL_SAMPLER_DIM_BUF
: {
2321 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2322 static const char *const names
[4] = {
2323 "samplerBuffer", NULL
, NULL
, NULL
2325 return names
[type_idx
];
2327 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2328 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2329 static const char *const names
[4] = {
2330 "samplerExternalOES", NULL
, NULL
, NULL
2332 return names
[type_idx
];
2335 unreachable("Unsupported sampler/image dimensionality");
2336 } /* sampler/image float dimensionality */
2339 switch (type
->sampler_dimensionality
) {
2340 case GLSL_SAMPLER_DIM_1D
: {
2341 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2342 static const char *const names
[4] = {
2343 "isampler1D", "isampler1DArray", NULL
, NULL
2345 return names
[type_idx
];
2347 case GLSL_SAMPLER_DIM_2D
: {
2348 static const char *const names
[8] = {
2349 "isampler2D", "isampler2DArray", NULL
, NULL
,
2350 "iimage2D", "iimage2DArray", NULL
, NULL
2352 return names
[offset
+ type_idx
];
2354 case GLSL_SAMPLER_DIM_3D
: {
2355 static const char *const names
[8] = {
2356 "isampler3D", NULL
, NULL
, NULL
,
2357 "iimage3D", NULL
, NULL
, NULL
2359 return names
[offset
+ type_idx
];
2361 case GLSL_SAMPLER_DIM_CUBE
: {
2362 static const char *const names
[8] = {
2363 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2364 "iimageCube", NULL
, NULL
, NULL
2366 return names
[offset
+ type_idx
];
2368 case GLSL_SAMPLER_DIM_MS
: {
2369 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2370 static const char *const names
[4] = {
2371 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2373 return names
[type_idx
];
2375 case GLSL_SAMPLER_DIM_RECT
: {
2376 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2377 static const char *const names
[4] = {
2378 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2380 return names
[type_idx
];
2382 case GLSL_SAMPLER_DIM_BUF
: {
2383 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2384 static const char *const names
[4] = {
2385 "isamplerBuffer", NULL
, NULL
, NULL
2387 return names
[type_idx
];
2390 unreachable("Unsupported isampler/iimage dimensionality");
2391 } /* sampler/image int dimensionality */
2393 case GLSL_TYPE_UINT
:
2394 switch (type
->sampler_dimensionality
) {
2395 case GLSL_SAMPLER_DIM_1D
: {
2396 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2397 static const char *const names
[4] = {
2398 "usampler1D", "usampler1DArray", NULL
, NULL
2400 return names
[type_idx
];
2402 case GLSL_SAMPLER_DIM_2D
: {
2403 static const char *const names
[8] = {
2404 "usampler2D", "usampler2DArray", NULL
, NULL
,
2405 "uimage2D", "uimage2DArray", NULL
, NULL
2407 return names
[offset
+ type_idx
];
2409 case GLSL_SAMPLER_DIM_3D
: {
2410 static const char *const names
[8] = {
2411 "usampler3D", NULL
, NULL
, NULL
,
2412 "uimage3D", NULL
, NULL
, NULL
2414 return names
[offset
+ type_idx
];
2416 case GLSL_SAMPLER_DIM_CUBE
: {
2417 static const char *const names
[8] = {
2418 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2419 "uimageCube", NULL
, NULL
, NULL
2421 return names
[offset
+ type_idx
];
2423 case GLSL_SAMPLER_DIM_MS
: {
2424 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2425 static const char *const names
[4] = {
2426 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2428 return names
[type_idx
];
2430 case GLSL_SAMPLER_DIM_RECT
: {
2431 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2432 static const char *const names
[4] = {
2433 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2435 return names
[type_idx
];
2437 case GLSL_SAMPLER_DIM_BUF
: {
2438 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2439 static const char *const names
[4] = {
2440 "usamplerBuffer", NULL
, NULL
, NULL
2442 return names
[type_idx
];
2445 unreachable("Unsupported usampler/uimage dimensionality");
2446 } /* sampler/image uint dimensionality */
2449 unreachable("Unsupported sampler/image type");
2450 } /* sampler/image type */
2452 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2455 unreachable("Unsupported type");
2460 select_gles_precision(unsigned qual_precision
,
2461 const glsl_type
*type
,
2462 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2464 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2465 * In GLES we take the precision from the type qualifier if present,
2466 * otherwise, if the type of the variable allows precision qualifiers at
2467 * all, we look for the default precision qualifier for that type in the
2470 assert(state
->es_shader
);
2472 unsigned precision
= GLSL_PRECISION_NONE
;
2473 if (qual_precision
) {
2474 precision
= qual_precision
;
2475 } else if (precision_qualifier_allowed(type
)) {
2476 const char *type_name
=
2477 get_type_name_for_precision_qualifier(type
->without_array());
2478 assert(type_name
!= NULL
);
2481 state
->symbols
->get_default_precision_qualifier(type_name
);
2482 if (precision
== ast_precision_none
) {
2483 _mesa_glsl_error(loc
, state
,
2484 "No precision specified in this scope for type `%s'",
2492 ast_fully_specified_type::glsl_type(const char **name
,
2493 struct _mesa_glsl_parse_state
*state
) const
2495 return this->specifier
->glsl_type(name
, state
);
2499 * Determine whether a toplevel variable declaration declares a varying. This
2500 * function operates by examining the variable's mode and the shader target,
2501 * so it correctly identifies linkage variables regardless of whether they are
2502 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2504 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2505 * this function will produce undefined results.
2508 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2511 case MESA_SHADER_VERTEX
:
2512 return var
->data
.mode
== ir_var_shader_out
;
2513 case MESA_SHADER_FRAGMENT
:
2514 return var
->data
.mode
== ir_var_shader_in
;
2516 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2522 * Matrix layout qualifiers are only allowed on certain types
2525 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2527 const glsl_type
*type
,
2530 if (var
&& !var
->is_in_buffer_block()) {
2531 /* Layout qualifiers may only apply to interface blocks and fields in
2534 _mesa_glsl_error(loc
, state
,
2535 "uniform block layout qualifiers row_major and "
2536 "column_major may not be applied to variables "
2537 "outside of uniform blocks");
2538 } else if (!type
->without_array()->is_matrix()) {
2539 /* The OpenGL ES 3.0 conformance tests did not originally allow
2540 * matrix layout qualifiers on non-matrices. However, the OpenGL
2541 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2542 * amended to specifically allow these layouts on all types. Emit
2543 * a warning so that people know their code may not be portable.
2545 _mesa_glsl_warning(loc
, state
,
2546 "uniform block layout qualifiers row_major and "
2547 "column_major applied to non-matrix types may "
2548 "be rejected by older compilers");
2553 process_qualifier_constant(struct _mesa_glsl_parse_state
*state
,
2555 const char *qual_indentifier
,
2556 ast_expression
*const_expression
,
2559 exec_list dummy_instructions
;
2561 if (const_expression
== NULL
) {
2566 ir_rvalue
*const ir
= const_expression
->hir(&dummy_instructions
, state
);
2568 ir_constant
*const const_int
= ir
->constant_expression_value();
2569 if (const_int
== NULL
|| !const_int
->type
->is_integer()) {
2570 _mesa_glsl_error(loc
, state
, "%s must be an integral constant "
2571 "expression", qual_indentifier
);
2575 if (const_int
->value
.i
[0] < 0) {
2576 _mesa_glsl_error(loc
, state
, "%s layout qualifier is invalid (%d < 0)",
2577 qual_indentifier
, const_int
->value
.u
[0]);
2581 /* If the location is const (and we've verified that
2582 * it is) then no instructions should have been emitted
2583 * when we converted it to HIR. If they were emitted,
2584 * then either the location isn't const after all, or
2585 * we are emitting unnecessary instructions.
2587 assert(dummy_instructions
.is_empty());
2589 *value
= const_int
->value
.u
[0];
2594 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2597 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2598 _mesa_glsl_error(loc
, state
,
2599 "invalid stream specified %d is larger than "
2600 "MAX_VERTEX_STREAMS - 1 (%d).",
2601 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2609 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2612 const glsl_type
*type
,
2613 const ast_type_qualifier
*qual
)
2615 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2616 _mesa_glsl_error(loc
, state
,
2617 "the \"binding\" qualifier only applies to uniforms and "
2618 "shader storage buffer objects");
2622 unsigned qual_binding
;
2623 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2628 const struct gl_context
*const ctx
= state
->ctx
;
2629 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2630 unsigned max_index
= qual_binding
+ elements
- 1;
2631 const glsl_type
*base_type
= type
->without_array();
2633 if (base_type
->is_interface()) {
2634 /* UBOs. From page 60 of the GLSL 4.20 specification:
2635 * "If the binding point for any uniform block instance is less than zero,
2636 * or greater than or equal to the implementation-dependent maximum
2637 * number of uniform buffer bindings, a compilation error will occur.
2638 * When the binding identifier is used with a uniform block instanced as
2639 * an array of size N, all elements of the array from binding through
2640 * binding + N – 1 must be within this range."
2642 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2644 if (qual
->flags
.q
.uniform
&&
2645 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2646 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2647 "the maximum number of UBO binding points (%d)",
2648 qual_binding
, elements
,
2649 ctx
->Const
.MaxUniformBufferBindings
);
2653 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2654 * "If the binding point for any uniform or shader storage block instance
2655 * is less than zero, or greater than or equal to the
2656 * implementation-dependent maximum number of uniform buffer bindings, a
2657 * compile-time error will occur. When the binding identifier is used
2658 * with a uniform or shader storage block instanced as an array of size
2659 * N, all elements of the array from binding through binding + N – 1 must
2660 * be within this range."
2662 if (qual
->flags
.q
.buffer
&&
2663 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2664 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2665 "the maximum number of SSBO binding points (%d)",
2666 qual_binding
, elements
,
2667 ctx
->Const
.MaxShaderStorageBufferBindings
);
2670 } else if (base_type
->is_sampler()) {
2671 /* Samplers. From page 63 of the GLSL 4.20 specification:
2672 * "If the binding is less than zero, or greater than or equal to the
2673 * implementation-dependent maximum supported number of units, a
2674 * compilation error will occur. When the binding identifier is used
2675 * with an array of size N, all elements of the array from binding
2676 * through binding + N - 1 must be within this range."
2678 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2680 if (max_index
>= limit
) {
2681 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2682 "exceeds the maximum number of texture image units "
2683 "(%u)", qual_binding
, elements
, limit
);
2687 } else if (base_type
->contains_atomic()) {
2688 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2689 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2690 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2691 " maximum number of atomic counter buffer bindings"
2692 "(%u)", qual_binding
,
2693 ctx
->Const
.MaxAtomicBufferBindings
);
2697 } else if ((state
->is_version(420, 310) ||
2698 state
->ARB_shading_language_420pack_enable
) &&
2699 base_type
->is_image()) {
2700 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2701 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2702 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2703 " maximum number of image units (%d)", max_index
,
2704 ctx
->Const
.MaxImageUnits
);
2709 _mesa_glsl_error(loc
, state
,
2710 "the \"binding\" qualifier only applies to uniform "
2711 "blocks, opaque variables, or arrays thereof");
2715 var
->data
.explicit_binding
= true;
2716 var
->data
.binding
= qual_binding
;
2722 static glsl_interp_qualifier
2723 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2724 ir_variable_mode mode
,
2725 struct _mesa_glsl_parse_state
*state
,
2728 glsl_interp_qualifier interpolation
;
2729 if (qual
->flags
.q
.flat
)
2730 interpolation
= INTERP_QUALIFIER_FLAT
;
2731 else if (qual
->flags
.q
.noperspective
)
2732 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2733 else if (qual
->flags
.q
.smooth
)
2734 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2736 interpolation
= INTERP_QUALIFIER_NONE
;
2738 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2739 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2740 _mesa_glsl_error(loc
, state
,
2741 "interpolation qualifier `%s' can only be applied to "
2742 "shader inputs or outputs.",
2743 interpolation_string(interpolation
));
2747 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2748 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2749 _mesa_glsl_error(loc
, state
,
2750 "interpolation qualifier `%s' cannot be applied to "
2751 "vertex shader inputs or fragment shader outputs",
2752 interpolation_string(interpolation
));
2754 } else if (state
->es_shader
&&
2755 ((mode
== ir_var_shader_in
&&
2756 state
->stage
!= MESA_SHADER_VERTEX
) ||
2757 (mode
== ir_var_shader_out
&&
2758 state
->stage
!= MESA_SHADER_FRAGMENT
))) {
2759 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
2761 * "When no interpolation qualifier is present, smooth interpolation
2764 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2767 return interpolation
;
2772 apply_explicit_location(const struct ast_type_qualifier
*qual
,
2774 struct _mesa_glsl_parse_state
*state
,
2779 unsigned qual_location
;
2780 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
2785 /* Checks for GL_ARB_explicit_uniform_location. */
2786 if (qual
->flags
.q
.uniform
) {
2787 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2790 const struct gl_context
*const ctx
= state
->ctx
;
2791 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
2793 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2794 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2795 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2796 ctx
->Const
.MaxUserAssignableUniformLocations
);
2800 var
->data
.explicit_location
= true;
2801 var
->data
.location
= qual_location
;
2805 /* Between GL_ARB_explicit_attrib_location an
2806 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2807 * stage can be assigned explicit locations. The checking here associates
2808 * the correct extension with the correct stage's input / output:
2812 * vertex explicit_loc sso
2813 * tess control sso sso
2816 * fragment sso explicit_loc
2818 switch (state
->stage
) {
2819 case MESA_SHADER_VERTEX
:
2820 if (var
->data
.mode
== ir_var_shader_in
) {
2821 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2827 if (var
->data
.mode
== ir_var_shader_out
) {
2828 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2837 case MESA_SHADER_TESS_CTRL
:
2838 case MESA_SHADER_TESS_EVAL
:
2839 case MESA_SHADER_GEOMETRY
:
2840 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2841 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2850 case MESA_SHADER_FRAGMENT
:
2851 if (var
->data
.mode
== ir_var_shader_in
) {
2852 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2858 if (var
->data
.mode
== ir_var_shader_out
) {
2859 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2868 case MESA_SHADER_COMPUTE
:
2869 _mesa_glsl_error(loc
, state
,
2870 "compute shader variables cannot be given "
2871 "explicit locations");
2876 _mesa_glsl_error(loc
, state
,
2877 "%s cannot be given an explicit location in %s shader",
2879 _mesa_shader_stage_to_string(state
->stage
));
2881 var
->data
.explicit_location
= true;
2883 switch (state
->stage
) {
2884 case MESA_SHADER_VERTEX
:
2885 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2886 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
2887 : (qual_location
+ VARYING_SLOT_VAR0
);
2890 case MESA_SHADER_TESS_CTRL
:
2891 case MESA_SHADER_TESS_EVAL
:
2892 case MESA_SHADER_GEOMETRY
:
2893 if (var
->data
.patch
)
2894 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
2896 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
2899 case MESA_SHADER_FRAGMENT
:
2900 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2901 ? (qual_location
+ FRAG_RESULT_DATA0
)
2902 : (qual_location
+ VARYING_SLOT_VAR0
);
2904 case MESA_SHADER_COMPUTE
:
2905 assert(!"Unexpected shader type");
2909 /* Check if index was set for the uniform instead of the function */
2910 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
2911 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
2912 "used with subroutine functions");
2916 unsigned qual_index
;
2917 if (qual
->flags
.q
.explicit_index
&&
2918 process_qualifier_constant(state
, loc
, "index", qual
->index
,
2920 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2921 * Layout Qualifiers):
2923 * "It is also a compile-time error if a fragment shader
2924 * sets a layout index to less than 0 or greater than 1."
2926 * Older specifications don't mandate a behavior; we take
2927 * this as a clarification and always generate the error.
2929 if (qual_index
> 1) {
2930 _mesa_glsl_error(loc
, state
,
2931 "explicit index may only be 0 or 1");
2933 var
->data
.explicit_index
= true;
2934 var
->data
.index
= qual_index
;
2941 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2943 struct _mesa_glsl_parse_state
*state
,
2946 const glsl_type
*base_type
= var
->type
->without_array();
2948 if (base_type
->is_image()) {
2949 if (var
->data
.mode
!= ir_var_uniform
&&
2950 var
->data
.mode
!= ir_var_function_in
) {
2951 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2952 "function parameters or uniform-qualified "
2953 "global variables");
2956 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2957 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2958 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2959 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2960 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2961 var
->data
.read_only
= true;
2963 if (qual
->flags
.q
.explicit_image_format
) {
2964 if (var
->data
.mode
== ir_var_function_in
) {
2965 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2966 "used on image function parameters");
2969 if (qual
->image_base_type
!= base_type
->sampled_type
) {
2970 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2971 "base data type of the image");
2974 var
->data
.image_format
= qual
->image_format
;
2976 if (var
->data
.mode
== ir_var_uniform
) {
2977 if (state
->es_shader
) {
2978 _mesa_glsl_error(loc
, state
, "all image uniforms "
2979 "must have a format layout qualifier");
2981 } else if (!qual
->flags
.q
.write_only
) {
2982 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2983 "`writeonly' must have a format layout "
2988 var
->data
.image_format
= GL_NONE
;
2991 /* From page 70 of the GLSL ES 3.1 specification:
2993 * "Except for image variables qualified with the format qualifiers
2994 * r32f, r32i, and r32ui, image variables must specify either memory
2995 * qualifier readonly or the memory qualifier writeonly."
2997 if (state
->es_shader
&&
2998 var
->data
.image_format
!= GL_R32F
&&
2999 var
->data
.image_format
!= GL_R32I
&&
3000 var
->data
.image_format
!= GL_R32UI
&&
3001 !var
->data
.image_read_only
&&
3002 !var
->data
.image_write_only
) {
3003 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3004 "r32f, r32i or r32ui must be qualified `readonly' or "
3008 } else if (qual
->flags
.q
.read_only
||
3009 qual
->flags
.q
.write_only
||
3010 qual
->flags
.q
.coherent
||
3011 qual
->flags
.q
._volatile
||
3012 qual
->flags
.q
.restrict_flag
||
3013 qual
->flags
.q
.explicit_image_format
) {
3014 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3019 static inline const char*
3020 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3022 if (origin_upper_left
&& pixel_center_integer
)
3023 return "origin_upper_left, pixel_center_integer";
3024 else if (origin_upper_left
)
3025 return "origin_upper_left";
3026 else if (pixel_center_integer
)
3027 return "pixel_center_integer";
3033 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3034 const struct ast_type_qualifier
*qual
)
3036 /* If gl_FragCoord was previously declared, and the qualifiers were
3037 * different in any way, return true.
3039 if (state
->fs_redeclares_gl_fragcoord
) {
3040 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3041 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3048 validate_array_dimensions(const glsl_type
*t
,
3049 struct _mesa_glsl_parse_state
*state
,
3051 if (t
->is_array()) {
3052 t
= t
->fields
.array
;
3053 while (t
->is_array()) {
3054 if (t
->is_unsized_array()) {
3055 _mesa_glsl_error(loc
, state
,
3056 "only the outermost array dimension can "
3061 t
= t
->fields
.array
;
3067 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3069 struct _mesa_glsl_parse_state
*state
,
3072 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3074 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3076 * "Within any shader, the first redeclarations of gl_FragCoord
3077 * must appear before any use of gl_FragCoord."
3079 * Generate a compiler error if above condition is not met by the
3082 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3083 if (earlier
!= NULL
&&
3084 earlier
->data
.used
&&
3085 !state
->fs_redeclares_gl_fragcoord
) {
3086 _mesa_glsl_error(loc
, state
,
3087 "gl_FragCoord used before its first redeclaration "
3088 "in fragment shader");
3091 /* Make sure all gl_FragCoord redeclarations specify the same layout
3094 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3095 const char *const qual_string
=
3096 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3097 qual
->flags
.q
.pixel_center_integer
);
3099 const char *const state_string
=
3100 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3101 state
->fs_pixel_center_integer
);
3103 _mesa_glsl_error(loc
, state
,
3104 "gl_FragCoord redeclared with different layout "
3105 "qualifiers (%s) and (%s) ",
3109 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3110 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3111 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3112 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3113 state
->fs_redeclares_gl_fragcoord
=
3114 state
->fs_origin_upper_left
||
3115 state
->fs_pixel_center_integer
||
3116 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3119 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3120 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3121 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3122 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3123 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3124 ? "origin_upper_left" : "pixel_center_integer";
3126 _mesa_glsl_error(loc
, state
,
3127 "layout qualifier `%s' can only be applied to "
3128 "fragment shader input `gl_FragCoord'",
3132 if (qual
->flags
.q
.explicit_location
) {
3133 apply_explicit_location(qual
, var
, state
, loc
);
3134 } else if (qual
->flags
.q
.explicit_index
) {
3135 if (!qual
->flags
.q
.subroutine_def
)
3136 _mesa_glsl_error(loc
, state
,
3137 "explicit index requires explicit location");
3140 if (qual
->flags
.q
.explicit_binding
) {
3141 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3144 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3145 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3146 unsigned qual_stream
;
3147 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3149 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3150 var
->data
.stream
= qual_stream
;
3154 if (var
->type
->contains_atomic()) {
3155 if (var
->data
.mode
== ir_var_uniform
) {
3156 if (var
->data
.explicit_binding
) {
3158 &state
->atomic_counter_offsets
[var
->data
.binding
];
3160 if (*offset
% ATOMIC_COUNTER_SIZE
)
3161 _mesa_glsl_error(loc
, state
,
3162 "misaligned atomic counter offset");
3164 var
->data
.offset
= *offset
;
3165 *offset
+= var
->type
->atomic_size();
3168 _mesa_glsl_error(loc
, state
,
3169 "atomic counters require explicit binding point");
3171 } else if (var
->data
.mode
!= ir_var_function_in
) {
3172 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3173 "function parameters or uniform-qualified "
3174 "global variables");
3178 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3179 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3180 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3181 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3182 * These extensions and all following extensions that add the 'layout'
3183 * keyword have been modified to require the use of 'in' or 'out'.
3185 * The following extension do not allow the deprecated keywords:
3187 * GL_AMD_conservative_depth
3188 * GL_ARB_conservative_depth
3189 * GL_ARB_gpu_shader5
3190 * GL_ARB_separate_shader_objects
3191 * GL_ARB_tessellation_shader
3192 * GL_ARB_transform_feedback3
3193 * GL_ARB_uniform_buffer_object
3195 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3196 * allow layout with the deprecated keywords.
3198 const bool relaxed_layout_qualifier_checking
=
3199 state
->ARB_fragment_coord_conventions_enable
;
3201 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3202 || qual
->flags
.q
.varying
;
3203 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3204 if (relaxed_layout_qualifier_checking
) {
3205 _mesa_glsl_warning(loc
, state
,
3206 "`layout' qualifier may not be used with "
3207 "`attribute' or `varying'");
3209 _mesa_glsl_error(loc
, state
,
3210 "`layout' qualifier may not be used with "
3211 "`attribute' or `varying'");
3215 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3216 * AMD_conservative_depth.
3218 int depth_layout_count
= qual
->flags
.q
.depth_any
3219 + qual
->flags
.q
.depth_greater
3220 + qual
->flags
.q
.depth_less
3221 + qual
->flags
.q
.depth_unchanged
;
3222 if (depth_layout_count
> 0
3223 && !state
->AMD_conservative_depth_enable
3224 && !state
->ARB_conservative_depth_enable
) {
3225 _mesa_glsl_error(loc
, state
,
3226 "extension GL_AMD_conservative_depth or "
3227 "GL_ARB_conservative_depth must be enabled "
3228 "to use depth layout qualifiers");
3229 } else if (depth_layout_count
> 0
3230 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3231 _mesa_glsl_error(loc
, state
,
3232 "depth layout qualifiers can be applied only to "
3234 } else if (depth_layout_count
> 1
3235 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3236 _mesa_glsl_error(loc
, state
,
3237 "at most one depth layout qualifier can be applied to "
3240 if (qual
->flags
.q
.depth_any
)
3241 var
->data
.depth_layout
= ir_depth_layout_any
;
3242 else if (qual
->flags
.q
.depth_greater
)
3243 var
->data
.depth_layout
= ir_depth_layout_greater
;
3244 else if (qual
->flags
.q
.depth_less
)
3245 var
->data
.depth_layout
= ir_depth_layout_less
;
3246 else if (qual
->flags
.q
.depth_unchanged
)
3247 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3249 var
->data
.depth_layout
= ir_depth_layout_none
;
3251 if (qual
->flags
.q
.std140
||
3252 qual
->flags
.q
.std430
||
3253 qual
->flags
.q
.packed
||
3254 qual
->flags
.q
.shared
) {
3255 _mesa_glsl_error(loc
, state
,
3256 "uniform and shader storage block layout qualifiers "
3257 "std140, std430, packed, and shared can only be "
3258 "applied to uniform or shader storage blocks, not "
3262 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3263 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3266 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3269 * "Fragment shaders also allow the following layout qualifier on in only
3270 * (not with variable declarations)
3271 * layout-qualifier-id
3272 * early_fragment_tests
3275 if (qual
->flags
.q
.early_fragment_tests
) {
3276 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3277 "valid in fragment shader input layout declaration.");
3282 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3284 struct _mesa_glsl_parse_state
*state
,
3288 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3290 if (qual
->flags
.q
.invariant
) {
3291 if (var
->data
.used
) {
3292 _mesa_glsl_error(loc
, state
,
3293 "variable `%s' may not be redeclared "
3294 "`invariant' after being used",
3297 var
->data
.invariant
= 1;
3301 if (qual
->flags
.q
.precise
) {
3302 if (var
->data
.used
) {
3303 _mesa_glsl_error(loc
, state
,
3304 "variable `%s' may not be redeclared "
3305 "`precise' after being used",
3308 var
->data
.precise
= 1;
3312 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3313 _mesa_glsl_error(loc
, state
,
3314 "`subroutine' may only be applied to uniforms, "
3315 "subroutine type declarations, or function definitions");
3318 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3319 || qual
->flags
.q
.uniform
3320 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3321 var
->data
.read_only
= 1;
3323 if (qual
->flags
.q
.centroid
)
3324 var
->data
.centroid
= 1;
3326 if (qual
->flags
.q
.sample
)
3327 var
->data
.sample
= 1;
3329 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3330 if (state
->es_shader
) {
3331 var
->data
.precision
=
3332 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3335 if (qual
->flags
.q
.patch
)
3336 var
->data
.patch
= 1;
3338 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3339 var
->type
= glsl_type::error_type
;
3340 _mesa_glsl_error(loc
, state
,
3341 "`attribute' variables may not be declared in the "
3343 _mesa_shader_stage_to_string(state
->stage
));
3346 /* Disallow layout qualifiers which may only appear on layout declarations. */
3347 if (qual
->flags
.q
.prim_type
) {
3348 _mesa_glsl_error(loc
, state
,
3349 "Primitive type may only be specified on GS input or output "
3350 "layout declaration, not on variables.");
3353 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3355 * "However, the const qualifier cannot be used with out or inout."
3357 * The same section of the GLSL 4.40 spec further clarifies this saying:
3359 * "The const qualifier cannot be used with out or inout, or a
3360 * compile-time error results."
3362 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3363 _mesa_glsl_error(loc
, state
,
3364 "`const' may not be applied to `out' or `inout' "
3365 "function parameters");
3368 /* If there is no qualifier that changes the mode of the variable, leave
3369 * the setting alone.
3371 assert(var
->data
.mode
!= ir_var_temporary
);
3372 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3373 var
->data
.mode
= ir_var_function_inout
;
3374 else if (qual
->flags
.q
.in
)
3375 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3376 else if (qual
->flags
.q
.attribute
3377 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3378 var
->data
.mode
= ir_var_shader_in
;
3379 else if (qual
->flags
.q
.out
)
3380 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3381 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3382 var
->data
.mode
= ir_var_shader_out
;
3383 else if (qual
->flags
.q
.uniform
)
3384 var
->data
.mode
= ir_var_uniform
;
3385 else if (qual
->flags
.q
.buffer
)
3386 var
->data
.mode
= ir_var_shader_storage
;
3387 else if (qual
->flags
.q
.shared_storage
)
3388 var
->data
.mode
= ir_var_shader_shared
;
3390 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3391 /* User-defined ins/outs are not permitted in compute shaders. */
3392 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3393 _mesa_glsl_error(loc
, state
,
3394 "user-defined input and output variables are not "
3395 "permitted in compute shaders");
3398 /* This variable is being used to link data between shader stages (in
3399 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3400 * that is allowed for such purposes.
3402 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3404 * "The varying qualifier can be used only with the data types
3405 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3408 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3409 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3411 * "Fragment inputs can only be signed and unsigned integers and
3412 * integer vectors, float, floating-point vectors, matrices, or
3413 * arrays of these. Structures cannot be input.
3415 * Similar text exists in the section on vertex shader outputs.
3417 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3418 * 3.00 spec allows structs as well. Varying structs are also allowed
3421 switch (var
->type
->get_scalar_type()->base_type
) {
3422 case GLSL_TYPE_FLOAT
:
3423 /* Ok in all GLSL versions */
3425 case GLSL_TYPE_UINT
:
3427 if (state
->is_version(130, 300))
3429 _mesa_glsl_error(loc
, state
,
3430 "varying variables must be of base type float in %s",
3431 state
->get_version_string());
3433 case GLSL_TYPE_STRUCT
:
3434 if (state
->is_version(150, 300))
3436 _mesa_glsl_error(loc
, state
,
3437 "varying variables may not be of type struct");
3439 case GLSL_TYPE_DOUBLE
:
3442 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3447 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3448 switch (state
->stage
) {
3449 case MESA_SHADER_VERTEX
:
3450 if (var
->data
.mode
== ir_var_shader_out
)
3451 var
->data
.invariant
= true;
3453 case MESA_SHADER_TESS_CTRL
:
3454 case MESA_SHADER_TESS_EVAL
:
3455 case MESA_SHADER_GEOMETRY
:
3456 if ((var
->data
.mode
== ir_var_shader_in
)
3457 || (var
->data
.mode
== ir_var_shader_out
))
3458 var
->data
.invariant
= true;
3460 case MESA_SHADER_FRAGMENT
:
3461 if (var
->data
.mode
== ir_var_shader_in
)
3462 var
->data
.invariant
= true;
3464 case MESA_SHADER_COMPUTE
:
3465 /* Invariance isn't meaningful in compute shaders. */
3470 var
->data
.interpolation
=
3471 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
3474 /* Does the declaration use the deprecated 'attribute' or 'varying'
3477 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3478 || qual
->flags
.q
.varying
;
3481 /* Validate auxiliary storage qualifiers */
3483 /* From section 4.3.4 of the GLSL 1.30 spec:
3484 * "It is an error to use centroid in in a vertex shader."
3486 * From section 4.3.4 of the GLSL ES 3.00 spec:
3487 * "It is an error to use centroid in or interpolation qualifiers in
3488 * a vertex shader input."
3491 /* Section 4.3.6 of the GLSL 1.30 specification states:
3492 * "It is an error to use centroid out in a fragment shader."
3494 * The GL_ARB_shading_language_420pack extension specification states:
3495 * "It is an error to use auxiliary storage qualifiers or interpolation
3496 * qualifiers on an output in a fragment shader."
3498 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3499 _mesa_glsl_error(loc
, state
,
3500 "sample qualifier may only be used on `in` or `out` "
3501 "variables between shader stages");
3503 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3504 _mesa_glsl_error(loc
, state
,
3505 "centroid qualifier may only be used with `in', "
3506 "`out' or `varying' variables between shader stages");
3509 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3510 _mesa_glsl_error(loc
, state
,
3511 "the shared storage qualifiers can only be used with "
3515 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3519 * Get the variable that is being redeclared by this declaration
3521 * Semantic checks to verify the validity of the redeclaration are also
3522 * performed. If semantic checks fail, compilation error will be emitted via
3523 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3526 * A pointer to an existing variable in the current scope if the declaration
3527 * is a redeclaration, \c NULL otherwise.
3529 static ir_variable
*
3530 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3531 struct _mesa_glsl_parse_state
*state
,
3532 bool allow_all_redeclarations
)
3534 /* Check if this declaration is actually a re-declaration, either to
3535 * resize an array or add qualifiers to an existing variable.
3537 * This is allowed for variables in the current scope, or when at
3538 * global scope (for built-ins in the implicit outer scope).
3540 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3541 if (earlier
== NULL
||
3542 (state
->current_function
!= NULL
&&
3543 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3548 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3550 * "It is legal to declare an array without a size and then
3551 * later re-declare the same name as an array of the same
3552 * type and specify a size."
3554 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3555 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3556 /* FINISHME: This doesn't match the qualifiers on the two
3557 * FINISHME: declarations. It's not 100% clear whether this is
3558 * FINISHME: required or not.
3561 const unsigned size
= unsigned(var
->type
->array_size());
3562 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3563 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3564 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3566 earlier
->data
.max_array_access
);
3569 earlier
->type
= var
->type
;
3572 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3573 state
->is_version(150, 0))
3574 && strcmp(var
->name
, "gl_FragCoord") == 0
3575 && earlier
->type
== var
->type
3576 && var
->data
.mode
== ir_var_shader_in
) {
3577 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3580 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3581 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3583 /* According to section 4.3.7 of the GLSL 1.30 spec,
3584 * the following built-in varaibles can be redeclared with an
3585 * interpolation qualifier:
3588 * * gl_FrontSecondaryColor
3589 * * gl_BackSecondaryColor
3591 * * gl_SecondaryColor
3593 } else if (state
->is_version(130, 0)
3594 && (strcmp(var
->name
, "gl_FrontColor") == 0
3595 || strcmp(var
->name
, "gl_BackColor") == 0
3596 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3597 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3598 || strcmp(var
->name
, "gl_Color") == 0
3599 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3600 && earlier
->type
== var
->type
3601 && earlier
->data
.mode
== var
->data
.mode
) {
3602 earlier
->data
.interpolation
= var
->data
.interpolation
;
3604 /* Layout qualifiers for gl_FragDepth. */
3605 } else if ((state
->AMD_conservative_depth_enable
||
3606 state
->ARB_conservative_depth_enable
)
3607 && strcmp(var
->name
, "gl_FragDepth") == 0
3608 && earlier
->type
== var
->type
3609 && earlier
->data
.mode
== var
->data
.mode
) {
3611 /** From the AMD_conservative_depth spec:
3612 * Within any shader, the first redeclarations of gl_FragDepth
3613 * must appear before any use of gl_FragDepth.
3615 if (earlier
->data
.used
) {
3616 _mesa_glsl_error(&loc
, state
,
3617 "the first redeclaration of gl_FragDepth "
3618 "must appear before any use of gl_FragDepth");
3621 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3622 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3623 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3624 _mesa_glsl_error(&loc
, state
,
3625 "gl_FragDepth: depth layout is declared here "
3626 "as '%s, but it was previously declared as "
3628 depth_layout_string(var
->data
.depth_layout
),
3629 depth_layout_string(earlier
->data
.depth_layout
));
3632 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3634 } else if (allow_all_redeclarations
) {
3635 if (earlier
->data
.mode
!= var
->data
.mode
) {
3636 _mesa_glsl_error(&loc
, state
,
3637 "redeclaration of `%s' with incorrect qualifiers",
3639 } else if (earlier
->type
!= var
->type
) {
3640 _mesa_glsl_error(&loc
, state
,
3641 "redeclaration of `%s' has incorrect type",
3645 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3652 * Generate the IR for an initializer in a variable declaration
3655 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3656 ast_fully_specified_type
*type
,
3657 exec_list
*initializer_instructions
,
3658 struct _mesa_glsl_parse_state
*state
)
3660 ir_rvalue
*result
= NULL
;
3662 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3664 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3666 * "All uniform variables are read-only and are initialized either
3667 * directly by an application via API commands, or indirectly by
3670 if (var
->data
.mode
== ir_var_uniform
) {
3671 state
->check_version(120, 0, &initializer_loc
,
3672 "cannot initialize uniform %s",
3676 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3678 * "Buffer variables cannot have initializers."
3680 if (var
->data
.mode
== ir_var_shader_storage
) {
3681 _mesa_glsl_error(&initializer_loc
, state
,
3682 "cannot initialize buffer variable %s",
3686 /* From section 4.1.7 of the GLSL 4.40 spec:
3688 * "Opaque variables [...] are initialized only through the
3689 * OpenGL API; they cannot be declared with an initializer in a
3692 if (var
->type
->contains_opaque()) {
3693 _mesa_glsl_error(&initializer_loc
, state
,
3694 "cannot initialize opaque variable %s",
3698 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3699 _mesa_glsl_error(&initializer_loc
, state
,
3700 "cannot initialize %s shader input / %s %s",
3701 _mesa_shader_stage_to_string(state
->stage
),
3702 (state
->stage
== MESA_SHADER_VERTEX
)
3703 ? "attribute" : "varying",
3707 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3708 _mesa_glsl_error(&initializer_loc
, state
,
3709 "cannot initialize %s shader output %s",
3710 _mesa_shader_stage_to_string(state
->stage
),
3714 /* If the initializer is an ast_aggregate_initializer, recursively store
3715 * type information from the LHS into it, so that its hir() function can do
3718 if (decl
->initializer
->oper
== ast_aggregate
)
3719 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3721 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3722 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3724 /* Calculate the constant value if this is a const or uniform
3727 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
3729 * "Declarations of globals without a storage qualifier, or with
3730 * just the const qualifier, may include initializers, in which case
3731 * they will be initialized before the first line of main() is
3732 * executed. Such initializers must be a constant expression."
3734 * The same section of the GLSL ES 3.00.4 spec has similar language.
3736 if (type
->qualifier
.flags
.q
.constant
3737 || type
->qualifier
.flags
.q
.uniform
3738 || (state
->es_shader
&& state
->current_function
== NULL
)) {
3739 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3741 if (new_rhs
!= NULL
) {
3744 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
3747 * "A constant expression is one of
3751 * - an expression formed by an operator on operands that are
3752 * all constant expressions, including getting an element of
3753 * a constant array, or a field of a constant structure, or
3754 * components of a constant vector. However, the sequence
3755 * operator ( , ) and the assignment operators ( =, +=, ...)
3756 * are not included in the operators that can create a
3757 * constant expression."
3759 * Section 12.43 (Sequence operator and constant expressions) says:
3761 * "Should the following construct be allowed?
3765 * The expression within the brackets uses the sequence operator
3766 * (',') and returns the integer 3 so the construct is declaring
3767 * a single-dimensional array of size 3. In some languages, the
3768 * construct declares a two-dimensional array. It would be
3769 * preferable to make this construct illegal to avoid confusion.
3771 * One possibility is to change the definition of the sequence
3772 * operator so that it does not return a constant-expression and
3773 * hence cannot be used to declare an array size.
3775 * RESOLUTION: The result of a sequence operator is not a
3776 * constant-expression."
3778 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
3779 * contains language almost identical to the section 4.3.3 in the
3780 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
3783 ir_constant
*constant_value
= rhs
->constant_expression_value();
3784 if (!constant_value
||
3785 (state
->is_version(430, 300) &&
3786 decl
->initializer
->has_sequence_subexpression())) {
3787 const char *const variable_mode
=
3788 (type
->qualifier
.flags
.q
.constant
)
3790 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
3792 /* If ARB_shading_language_420pack is enabled, initializers of
3793 * const-qualified local variables do not have to be constant
3794 * expressions. Const-qualified global variables must still be
3795 * initialized with constant expressions.
3797 if (!state
->has_420pack()
3798 || state
->current_function
== NULL
) {
3799 _mesa_glsl_error(& initializer_loc
, state
,
3800 "initializer of %s variable `%s' must be a "
3801 "constant expression",
3804 if (var
->type
->is_numeric()) {
3805 /* Reduce cascading errors. */
3806 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3807 ? ir_constant::zero(state
, var
->type
) : NULL
;
3811 rhs
= constant_value
;
3812 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3813 ? constant_value
: NULL
;
3816 if (var
->type
->is_numeric()) {
3817 /* Reduce cascading errors. */
3818 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3819 ? ir_constant::zero(state
, var
->type
) : NULL
;
3824 if (rhs
&& !rhs
->type
->is_error()) {
3825 bool temp
= var
->data
.read_only
;
3826 if (type
->qualifier
.flags
.q
.constant
)
3827 var
->data
.read_only
= false;
3829 /* Never emit code to initialize a uniform.
3831 const glsl_type
*initializer_type
;
3832 if (!type
->qualifier
.flags
.q
.uniform
) {
3833 do_assignment(initializer_instructions
, state
,
3838 type
->get_location());
3839 initializer_type
= result
->type
;
3841 initializer_type
= rhs
->type
;
3843 var
->constant_initializer
= rhs
->constant_expression_value();
3844 var
->data
.has_initializer
= true;
3846 /* If the declared variable is an unsized array, it must inherrit
3847 * its full type from the initializer. A declaration such as
3849 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3853 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3855 * The assignment generated in the if-statement (below) will also
3856 * automatically handle this case for non-uniforms.
3858 * If the declared variable is not an array, the types must
3859 * already match exactly. As a result, the type assignment
3860 * here can be done unconditionally. For non-uniforms the call
3861 * to do_assignment can change the type of the initializer (via
3862 * the implicit conversion rules). For uniforms the initializer
3863 * must be a constant expression, and the type of that expression
3864 * was validated above.
3866 var
->type
= initializer_type
;
3868 var
->data
.read_only
= temp
;
3875 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3876 YYLTYPE loc
, ir_variable
*var
,
3877 unsigned num_vertices
,
3879 const char *var_category
)
3881 if (var
->type
->is_unsized_array()) {
3882 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3884 * All geometry shader input unsized array declarations will be
3885 * sized by an earlier input layout qualifier, when present, as per
3886 * the following table.
3888 * Followed by a table mapping each allowed input layout qualifier to
3889 * the corresponding input length.
3891 * Similarly for tessellation control shader outputs.
3893 if (num_vertices
!= 0)
3894 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3897 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3898 * includes the following examples of compile-time errors:
3900 * // code sequence within one shader...
3901 * in vec4 Color1[]; // size unknown
3902 * ...Color1.length()...// illegal, length() unknown
3903 * in vec4 Color2[2]; // size is 2
3904 * ...Color1.length()...// illegal, Color1 still has no size
3905 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3906 * layout(lines) in; // legal, input size is 2, matching
3907 * in vec4 Color4[3]; // illegal, contradicts layout
3910 * To detect the case illustrated by Color3, we verify that the size of
3911 * an explicitly-sized array matches the size of any previously declared
3912 * explicitly-sized array. To detect the case illustrated by Color4, we
3913 * verify that the size of an explicitly-sized array is consistent with
3914 * any previously declared input layout.
3916 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3917 _mesa_glsl_error(&loc
, state
,
3918 "%s size contradicts previously declared layout "
3919 "(size is %u, but layout requires a size of %u)",
3920 var_category
, var
->type
->length
, num_vertices
);
3921 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3922 _mesa_glsl_error(&loc
, state
,
3923 "%s sizes are inconsistent (size is %u, but a "
3924 "previous declaration has size %u)",
3925 var_category
, var
->type
->length
, *size
);
3927 *size
= var
->type
->length
;
3933 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3934 YYLTYPE loc
, ir_variable
*var
)
3936 unsigned num_vertices
= 0;
3938 if (state
->tcs_output_vertices_specified
) {
3939 if (!state
->out_qualifier
->vertices
->
3940 process_qualifier_constant(state
, "vertices",
3941 &num_vertices
, false)) {
3945 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
3946 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
3947 "GL_MAX_PATCH_VERTICES", num_vertices
);
3952 if (!var
->type
->is_array() && !var
->data
.patch
) {
3953 _mesa_glsl_error(&loc
, state
,
3954 "tessellation control shader outputs must be arrays");
3956 /* To avoid cascading failures, short circuit the checks below. */
3960 if (var
->data
.patch
)
3963 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3964 &state
->tcs_output_size
,
3965 "tessellation control shader output");
3969 * Do additional processing necessary for tessellation control/evaluation shader
3970 * input declarations. This covers both interface block arrays and bare input
3974 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3975 YYLTYPE loc
, ir_variable
*var
)
3977 if (!var
->type
->is_array() && !var
->data
.patch
) {
3978 _mesa_glsl_error(&loc
, state
,
3979 "per-vertex tessellation shader inputs must be arrays");
3980 /* Avoid cascading failures. */
3984 if (var
->data
.patch
)
3987 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3988 if (var
->type
->is_unsized_array()) {
3989 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3990 state
->Const
.MaxPatchVertices
);
3996 * Do additional processing necessary for geometry shader input declarations
3997 * (this covers both interface blocks arrays and bare input variables).
4000 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4001 YYLTYPE loc
, ir_variable
*var
)
4003 unsigned num_vertices
= 0;
4005 if (state
->gs_input_prim_type_specified
) {
4006 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4009 /* Geometry shader input variables must be arrays. Caller should have
4010 * reported an error for this.
4012 if (!var
->type
->is_array()) {
4013 assert(state
->error
);
4015 /* To avoid cascading failures, short circuit the checks below. */
4019 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4020 &state
->gs_input_size
,
4021 "geometry shader input");
4025 validate_identifier(const char *identifier
, YYLTYPE loc
,
4026 struct _mesa_glsl_parse_state
*state
)
4028 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4030 * "Identifiers starting with "gl_" are reserved for use by
4031 * OpenGL, and may not be declared in a shader as either a
4032 * variable or a function."
4034 if (is_gl_identifier(identifier
)) {
4035 _mesa_glsl_error(&loc
, state
,
4036 "identifier `%s' uses reserved `gl_' prefix",
4038 } else if (strstr(identifier
, "__")) {
4039 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4042 * "In addition, all identifiers containing two
4043 * consecutive underscores (__) are reserved as
4044 * possible future keywords."
4046 * The intention is that names containing __ are reserved for internal
4047 * use by the implementation, and names prefixed with GL_ are reserved
4048 * for use by Khronos. Names simply containing __ are dangerous to use,
4049 * but should be allowed.
4051 * A future version of the GLSL specification will clarify this.
4053 _mesa_glsl_warning(&loc
, state
,
4054 "identifier `%s' uses reserved `__' string",
4060 ast_declarator_list::hir(exec_list
*instructions
,
4061 struct _mesa_glsl_parse_state
*state
)
4064 const struct glsl_type
*decl_type
;
4065 const char *type_name
= NULL
;
4066 ir_rvalue
*result
= NULL
;
4067 YYLTYPE loc
= this->get_location();
4069 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4071 * "To ensure that a particular output variable is invariant, it is
4072 * necessary to use the invariant qualifier. It can either be used to
4073 * qualify a previously declared variable as being invariant
4075 * invariant gl_Position; // make existing gl_Position be invariant"
4077 * In these cases the parser will set the 'invariant' flag in the declarator
4078 * list, and the type will be NULL.
4080 if (this->invariant
) {
4081 assert(this->type
== NULL
);
4083 if (state
->current_function
!= NULL
) {
4084 _mesa_glsl_error(& loc
, state
,
4085 "all uses of `invariant' keyword must be at global "
4089 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4090 assert(decl
->array_specifier
== NULL
);
4091 assert(decl
->initializer
== NULL
);
4093 ir_variable
*const earlier
=
4094 state
->symbols
->get_variable(decl
->identifier
);
4095 if (earlier
== NULL
) {
4096 _mesa_glsl_error(& loc
, state
,
4097 "undeclared variable `%s' cannot be marked "
4098 "invariant", decl
->identifier
);
4099 } else if (!is_varying_var(earlier
, state
->stage
)) {
4100 _mesa_glsl_error(&loc
, state
,
4101 "`%s' cannot be marked invariant; interfaces between "
4102 "shader stages only.", decl
->identifier
);
4103 } else if (earlier
->data
.used
) {
4104 _mesa_glsl_error(& loc
, state
,
4105 "variable `%s' may not be redeclared "
4106 "`invariant' after being used",
4109 earlier
->data
.invariant
= true;
4113 /* Invariant redeclarations do not have r-values.
4118 if (this->precise
) {
4119 assert(this->type
== NULL
);
4121 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4122 assert(decl
->array_specifier
== NULL
);
4123 assert(decl
->initializer
== NULL
);
4125 ir_variable
*const earlier
=
4126 state
->symbols
->get_variable(decl
->identifier
);
4127 if (earlier
== NULL
) {
4128 _mesa_glsl_error(& loc
, state
,
4129 "undeclared variable `%s' cannot be marked "
4130 "precise", decl
->identifier
);
4131 } else if (state
->current_function
!= NULL
&&
4132 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4133 /* Note: we have to check if we're in a function, since
4134 * builtins are treated as having come from another scope.
4136 _mesa_glsl_error(& loc
, state
,
4137 "variable `%s' from an outer scope may not be "
4138 "redeclared `precise' in this scope",
4140 } else if (earlier
->data
.used
) {
4141 _mesa_glsl_error(& loc
, state
,
4142 "variable `%s' may not be redeclared "
4143 "`precise' after being used",
4146 earlier
->data
.precise
= true;
4150 /* Precise redeclarations do not have r-values either. */
4154 assert(this->type
!= NULL
);
4155 assert(!this->invariant
);
4156 assert(!this->precise
);
4158 /* The type specifier may contain a structure definition. Process that
4159 * before any of the variable declarations.
4161 (void) this->type
->specifier
->hir(instructions
, state
);
4163 decl_type
= this->type
->glsl_type(& type_name
, state
);
4165 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4166 * "Buffer variables may only be declared inside interface blocks
4167 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4168 * shader storage blocks. It is a compile-time error to declare buffer
4169 * variables at global scope (outside a block)."
4171 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4172 _mesa_glsl_error(&loc
, state
,
4173 "buffer variables cannot be declared outside "
4174 "interface blocks");
4177 /* An offset-qualified atomic counter declaration sets the default
4178 * offset for the next declaration within the same atomic counter
4181 if (decl_type
&& decl_type
->contains_atomic()) {
4182 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4183 type
->qualifier
.flags
.q
.explicit_offset
) {
4184 unsigned qual_binding
;
4185 unsigned qual_offset
;
4186 if (process_qualifier_constant(state
, &loc
, "binding",
4187 type
->qualifier
.binding
,
4189 && process_qualifier_constant(state
, &loc
, "offset",
4190 type
->qualifier
.offset
,
4192 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4197 if (this->declarations
.is_empty()) {
4198 /* If there is no structure involved in the program text, there are two
4199 * possible scenarios:
4201 * - The program text contained something like 'vec4;'. This is an
4202 * empty declaration. It is valid but weird. Emit a warning.
4204 * - The program text contained something like 'S;' and 'S' is not the
4205 * name of a known structure type. This is both invalid and weird.
4208 * - The program text contained something like 'mediump float;'
4209 * when the programmer probably meant 'precision mediump
4210 * float;' Emit a warning with a description of what they
4211 * probably meant to do.
4213 * Note that if decl_type is NULL and there is a structure involved,
4214 * there must have been some sort of error with the structure. In this
4215 * case we assume that an error was already generated on this line of
4216 * code for the structure. There is no need to generate an additional,
4219 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4222 if (decl_type
== NULL
) {
4223 _mesa_glsl_error(&loc
, state
,
4224 "invalid type `%s' in empty declaration",
4227 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4228 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4231 * "... any declaration that leaves the size undefined is
4232 * disallowed as this would add complexity and there are no
4235 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4236 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4237 "or implicitly defined");
4240 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4242 * "The combinations of types and qualifiers that cause
4243 * compile-time or link-time errors are the same whether or not
4244 * the declaration is empty."
4246 validate_array_dimensions(decl_type
, state
, &loc
);
4249 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4250 /* Empty atomic counter declarations are allowed and useful
4251 * to set the default offset qualifier.
4254 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4255 if (this->type
->specifier
->structure
!= NULL
) {
4256 _mesa_glsl_error(&loc
, state
,
4257 "precision qualifiers can't be applied "
4260 static const char *const precision_names
[] = {
4267 _mesa_glsl_warning(&loc
, state
,
4268 "empty declaration with precision "
4269 "qualifier, to set the default precision, "
4270 "use `precision %s %s;'",
4271 precision_names
[this->type
->
4272 qualifier
.precision
],
4275 } else if (this->type
->specifier
->structure
== NULL
) {
4276 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4281 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4282 const struct glsl_type
*var_type
;
4284 const char *identifier
= decl
->identifier
;
4285 /* FINISHME: Emit a warning if a variable declaration shadows a
4286 * FINISHME: declaration at a higher scope.
4289 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4290 if (type_name
!= NULL
) {
4291 _mesa_glsl_error(& loc
, state
,
4292 "invalid type `%s' in declaration of `%s'",
4293 type_name
, decl
->identifier
);
4295 _mesa_glsl_error(& loc
, state
,
4296 "invalid type in declaration of `%s'",
4302 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4306 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4308 _mesa_glsl_error(& loc
, state
,
4309 "invalid type in declaration of `%s'",
4311 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4316 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4319 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4321 /* The 'varying in' and 'varying out' qualifiers can only be used with
4322 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4325 if (this->type
->qualifier
.flags
.q
.varying
) {
4326 if (this->type
->qualifier
.flags
.q
.in
) {
4327 _mesa_glsl_error(& loc
, state
,
4328 "`varying in' qualifier in declaration of "
4329 "`%s' only valid for geometry shaders using "
4330 "ARB_geometry_shader4 or EXT_geometry_shader4",
4332 } else if (this->type
->qualifier
.flags
.q
.out
) {
4333 _mesa_glsl_error(& loc
, state
,
4334 "`varying out' qualifier in declaration of "
4335 "`%s' only valid for geometry shaders using "
4336 "ARB_geometry_shader4 or EXT_geometry_shader4",
4341 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4343 * "Global variables can only use the qualifiers const,
4344 * attribute, uniform, or varying. Only one may be
4347 * Local variables can only use the qualifier const."
4349 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4350 * any extension that adds the 'layout' keyword.
4352 if (!state
->is_version(130, 300)
4353 && !state
->has_explicit_attrib_location()
4354 && !state
->has_separate_shader_objects()
4355 && !state
->ARB_fragment_coord_conventions_enable
) {
4356 if (this->type
->qualifier
.flags
.q
.out
) {
4357 _mesa_glsl_error(& loc
, state
,
4358 "`out' qualifier in declaration of `%s' "
4359 "only valid for function parameters in %s",
4360 decl
->identifier
, state
->get_version_string());
4362 if (this->type
->qualifier
.flags
.q
.in
) {
4363 _mesa_glsl_error(& loc
, state
,
4364 "`in' qualifier in declaration of `%s' "
4365 "only valid for function parameters in %s",
4366 decl
->identifier
, state
->get_version_string());
4368 /* FINISHME: Test for other invalid qualifiers. */
4371 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4373 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4376 if (this->type
->qualifier
.flags
.q
.invariant
) {
4377 if (!is_varying_var(var
, state
->stage
)) {
4378 _mesa_glsl_error(&loc
, state
,
4379 "`%s' cannot be marked invariant; interfaces between "
4380 "shader stages only", var
->name
);
4384 if (state
->current_function
!= NULL
) {
4385 const char *mode
= NULL
;
4386 const char *extra
= "";
4388 /* There is no need to check for 'inout' here because the parser will
4389 * only allow that in function parameter lists.
4391 if (this->type
->qualifier
.flags
.q
.attribute
) {
4393 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4394 mode
= "subroutine uniform";
4395 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4397 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4399 } else if (this->type
->qualifier
.flags
.q
.in
) {
4401 extra
= " or in function parameter list";
4402 } else if (this->type
->qualifier
.flags
.q
.out
) {
4404 extra
= " or in function parameter list";
4408 _mesa_glsl_error(& loc
, state
,
4409 "%s variable `%s' must be declared at "
4411 mode
, var
->name
, extra
);
4413 } else if (var
->data
.mode
== ir_var_shader_in
) {
4414 var
->data
.read_only
= true;
4416 if (state
->stage
== MESA_SHADER_VERTEX
) {
4417 bool error_emitted
= false;
4419 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4421 * "Vertex shader inputs can only be float, floating-point
4422 * vectors, matrices, signed and unsigned integers and integer
4423 * vectors. Vertex shader inputs can also form arrays of these
4424 * types, but not structures."
4426 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4428 * "Vertex shader inputs can only be float, floating-point
4429 * vectors, matrices, signed and unsigned integers and integer
4430 * vectors. They cannot be arrays or structures."
4432 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4434 * "The attribute qualifier can be used only with float,
4435 * floating-point vectors, and matrices. Attribute variables
4436 * cannot be declared as arrays or structures."
4438 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4440 * "Vertex shader inputs can only be float, floating-point
4441 * vectors, matrices, signed and unsigned integers and integer
4442 * vectors. Vertex shader inputs cannot be arrays or
4445 const glsl_type
*check_type
= var
->type
->without_array();
4447 switch (check_type
->base_type
) {
4448 case GLSL_TYPE_FLOAT
:
4450 case GLSL_TYPE_UINT
:
4452 if (state
->is_version(120, 300))
4454 case GLSL_TYPE_DOUBLE
:
4455 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4459 _mesa_glsl_error(& loc
, state
,
4460 "vertex shader input / attribute cannot have "
4462 var
->type
->is_array() ? "array of " : "",
4464 error_emitted
= true;
4467 if (!error_emitted
&& var
->type
->is_array() &&
4468 !state
->check_version(150, 0, &loc
,
4469 "vertex shader input / attribute "
4470 "cannot have array type")) {
4471 error_emitted
= true;
4473 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4474 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4476 * Geometry shader input variables get the per-vertex values
4477 * written out by vertex shader output variables of the same
4478 * names. Since a geometry shader operates on a set of
4479 * vertices, each input varying variable (or input block, see
4480 * interface blocks below) needs to be declared as an array.
4482 if (!var
->type
->is_array()) {
4483 _mesa_glsl_error(&loc
, state
,
4484 "geometry shader inputs must be arrays");
4487 handle_geometry_shader_input_decl(state
, loc
, var
);
4488 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4489 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4491 * It is a compile-time error to declare a fragment shader
4492 * input with, or that contains, any of the following types:
4496 * * An array of arrays
4497 * * An array of structures
4498 * * A structure containing an array
4499 * * A structure containing a structure
4501 if (state
->es_shader
) {
4502 const glsl_type
*check_type
= var
->type
->without_array();
4503 if (check_type
->is_boolean() ||
4504 check_type
->contains_opaque()) {
4505 _mesa_glsl_error(&loc
, state
,
4506 "fragment shader input cannot have type %s",
4509 if (var
->type
->is_array() &&
4510 var
->type
->fields
.array
->is_array()) {
4511 _mesa_glsl_error(&loc
, state
,
4513 "cannot have an array of arrays",
4514 _mesa_shader_stage_to_string(state
->stage
));
4516 if (var
->type
->is_array() &&
4517 var
->type
->fields
.array
->is_record()) {
4518 _mesa_glsl_error(&loc
, state
,
4519 "fragment shader input "
4520 "cannot have an array of structs");
4522 if (var
->type
->is_record()) {
4523 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4524 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4525 var
->type
->fields
.structure
[i
].type
->is_record())
4526 _mesa_glsl_error(&loc
, state
,
4527 "fragement shader input cannot have "
4528 "a struct that contains an "
4533 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4534 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4535 handle_tess_shader_input_decl(state
, loc
, var
);
4537 } else if (var
->data
.mode
== ir_var_shader_out
) {
4538 const glsl_type
*check_type
= var
->type
->without_array();
4540 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4542 * It is a compile-time error to declare a vertex, tessellation
4543 * evaluation, tessellation control, or geometry shader output
4544 * that contains any of the following:
4546 * * A Boolean type (bool, bvec2 ...)
4549 if (check_type
->is_boolean() || check_type
->contains_opaque())
4550 _mesa_glsl_error(&loc
, state
,
4551 "%s shader output cannot have type %s",
4552 _mesa_shader_stage_to_string(state
->stage
),
4555 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4557 * It is a compile-time error to declare a fragment shader output
4558 * that contains any of the following:
4560 * * A Boolean type (bool, bvec2 ...)
4561 * * A double-precision scalar or vector (double, dvec2 ...)
4566 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4567 if (check_type
->is_record() || check_type
->is_matrix())
4568 _mesa_glsl_error(&loc
, state
,
4569 "fragment shader output "
4570 "cannot have struct or matrix type");
4571 switch (check_type
->base_type
) {
4572 case GLSL_TYPE_UINT
:
4574 case GLSL_TYPE_FLOAT
:
4577 _mesa_glsl_error(&loc
, state
,
4578 "fragment shader output cannot have "
4579 "type %s", check_type
->name
);
4583 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4585 * It is a compile-time error to declare a vertex shader output
4586 * with, or that contains, any of the following types:
4590 * * An array of arrays
4591 * * An array of structures
4592 * * A structure containing an array
4593 * * A structure containing a structure
4595 * It is a compile-time error to declare a fragment shader output
4596 * with, or that contains, any of the following types:
4602 * * An array of array
4604 if (state
->es_shader
) {
4605 if (var
->type
->is_array() &&
4606 var
->type
->fields
.array
->is_array()) {
4607 _mesa_glsl_error(&loc
, state
,
4609 "cannot have an array of arrays",
4610 _mesa_shader_stage_to_string(state
->stage
));
4612 if (state
->stage
== MESA_SHADER_VERTEX
) {
4613 if (var
->type
->is_array() &&
4614 var
->type
->fields
.array
->is_record()) {
4615 _mesa_glsl_error(&loc
, state
,
4616 "vertex shader output "
4617 "cannot have an array of structs");
4619 if (var
->type
->is_record()) {
4620 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4621 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4622 var
->type
->fields
.structure
[i
].type
->is_record())
4623 _mesa_glsl_error(&loc
, state
,
4624 "vertex shader output cannot have a "
4625 "struct that contains an "
4632 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4633 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4635 } else if (var
->type
->contains_subroutine()) {
4636 /* declare subroutine uniforms as hidden */
4637 var
->data
.how_declared
= ir_var_hidden
;
4640 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4641 * so must integer vertex outputs.
4643 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4644 * "Fragment shader inputs that are signed or unsigned integers or
4645 * integer vectors must be qualified with the interpolation qualifier
4648 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4649 * "Fragment shader inputs that are, or contain, signed or unsigned
4650 * integers or integer vectors must be qualified with the
4651 * interpolation qualifier flat."
4653 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4654 * "Vertex shader outputs that are, or contain, signed or unsigned
4655 * integers or integer vectors must be qualified with the
4656 * interpolation qualifier flat."
4658 * Note that prior to GLSL 1.50, this requirement applied to vertex
4659 * outputs rather than fragment inputs. That creates problems in the
4660 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4661 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4662 * apply the restriction to both vertex outputs and fragment inputs.
4664 * Note also that the desktop GLSL specs are missing the text "or
4665 * contain"; this is presumably an oversight, since there is no
4666 * reasonable way to interpolate a fragment shader input that contains
4669 if (state
->is_version(130, 300) &&
4670 var
->type
->contains_integer() &&
4671 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4672 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4673 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4674 && state
->es_shader
))) {
4675 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4676 "vertex output" : "fragment input";
4677 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4678 "an integer, then it must be qualified with 'flat'",
4682 /* Double fragment inputs must be qualified with 'flat'. */
4683 if (var
->type
->contains_double() &&
4684 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4685 state
->stage
== MESA_SHADER_FRAGMENT
&&
4686 var
->data
.mode
== ir_var_shader_in
) {
4687 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4688 "a double, then it must be qualified with 'flat'",
4692 /* Interpolation qualifiers cannot be applied to 'centroid' and
4693 * 'centroid varying'.
4695 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4696 * "interpolation qualifiers may only precede the qualifiers in,
4697 * centroid in, out, or centroid out in a declaration. They do not apply
4698 * to the deprecated storage qualifiers varying or centroid varying."
4700 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4702 if (state
->is_version(130, 0)
4703 && this->type
->qualifier
.has_interpolation()
4704 && this->type
->qualifier
.flags
.q
.varying
) {
4706 const char *i
= interpolation_string(var
->data
.interpolation
);
4708 if (this->type
->qualifier
.flags
.q
.centroid
)
4709 s
= "centroid varying";
4713 _mesa_glsl_error(&loc
, state
,
4714 "qualifier '%s' cannot be applied to the "
4715 "deprecated storage qualifier '%s'", i
, s
);
4719 /* Interpolation qualifiers can only apply to vertex shader outputs and
4720 * fragment shader inputs.
4722 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4723 * "Outputs from a vertex shader (out) and inputs to a fragment
4724 * shader (in) can be further qualified with one or more of these
4725 * interpolation qualifiers"
4727 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4728 * "These interpolation qualifiers may only precede the qualifiers
4729 * in, centroid in, out, or centroid out in a declaration. They do
4730 * not apply to inputs into a vertex shader or outputs from a
4733 if (state
->is_version(130, 300)
4734 && this->type
->qualifier
.has_interpolation()) {
4736 const char *i
= interpolation_string(var
->data
.interpolation
);
4737 switch (state
->stage
) {
4738 case MESA_SHADER_VERTEX
:
4739 if (this->type
->qualifier
.flags
.q
.in
) {
4740 _mesa_glsl_error(&loc
, state
,
4741 "qualifier '%s' cannot be applied to vertex "
4742 "shader inputs", i
);
4745 case MESA_SHADER_FRAGMENT
:
4746 if (this->type
->qualifier
.flags
.q
.out
) {
4747 _mesa_glsl_error(&loc
, state
,
4748 "qualifier '%s' cannot be applied to fragment "
4749 "shader outputs", i
);
4758 /* From section 4.3.4 of the GLSL 4.00 spec:
4759 * "Input variables may not be declared using the patch in qualifier
4760 * in tessellation control or geometry shaders."
4762 * From section 4.3.6 of the GLSL 4.00 spec:
4763 * "It is an error to use patch out in a vertex, tessellation
4764 * evaluation, or geometry shader."
4766 * This doesn't explicitly forbid using them in a fragment shader, but
4767 * that's probably just an oversight.
4769 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4770 && this->type
->qualifier
.flags
.q
.patch
4771 && this->type
->qualifier
.flags
.q
.in
) {
4773 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4774 "tessellation evaluation shader");
4777 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4778 && this->type
->qualifier
.flags
.q
.patch
4779 && this->type
->qualifier
.flags
.q
.out
) {
4781 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4782 "tessellation control shader");
4785 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4787 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4788 state
->check_precision_qualifiers_allowed(&loc
);
4792 /* If a precision qualifier is allowed on a type, it is allowed on
4793 * an array of that type.
4795 if (!(this->type
->qualifier
.precision
== ast_precision_none
4796 || precision_qualifier_allowed(var
->type
->without_array()))) {
4798 _mesa_glsl_error(&loc
, state
,
4799 "precision qualifiers apply only to floating point"
4800 ", integer and opaque types");
4803 /* From section 4.1.7 of the GLSL 4.40 spec:
4805 * "[Opaque types] can only be declared as function
4806 * parameters or uniform-qualified variables."
4808 if (var_type
->contains_opaque() &&
4809 !this->type
->qualifier
.flags
.q
.uniform
) {
4810 _mesa_glsl_error(&loc
, state
,
4811 "opaque variables must be declared uniform");
4814 /* Process the initializer and add its instructions to a temporary
4815 * list. This list will be added to the instruction stream (below) after
4816 * the declaration is added. This is done because in some cases (such as
4817 * redeclarations) the declaration may not actually be added to the
4818 * instruction stream.
4820 exec_list initializer_instructions
;
4822 /* Examine var name here since var may get deleted in the next call */
4823 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4825 ir_variable
*earlier
=
4826 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4827 false /* allow_all_redeclarations */);
4828 if (earlier
!= NULL
) {
4830 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4831 _mesa_glsl_error(&loc
, state
,
4832 "`%s' has already been redeclared using "
4833 "gl_PerVertex", earlier
->name
);
4835 earlier
->data
.how_declared
= ir_var_declared_normally
;
4838 if (decl
->initializer
!= NULL
) {
4839 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4841 &initializer_instructions
, state
);
4843 validate_array_dimensions(var_type
, state
, &loc
);
4846 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4848 * "It is an error to write to a const variable outside of
4849 * its declaration, so they must be initialized when
4852 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4853 _mesa_glsl_error(& loc
, state
,
4854 "const declaration of `%s' must be initialized",
4858 if (state
->es_shader
) {
4859 const glsl_type
*const t
= (earlier
== NULL
)
4860 ? var
->type
: earlier
->type
;
4862 if (t
->is_unsized_array())
4863 /* Section 10.17 of the GLSL ES 1.00 specification states that
4864 * unsized array declarations have been removed from the language.
4865 * Arrays that are sized using an initializer are still explicitly
4866 * sized. However, GLSL ES 1.00 does not allow array
4867 * initializers. That is only allowed in GLSL ES 3.00.
4869 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4871 * "An array type can also be formed without specifying a size
4872 * if the definition includes an initializer:
4874 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4875 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4880 _mesa_glsl_error(& loc
, state
,
4881 "unsized array declarations are not allowed in "
4885 /* If the declaration is not a redeclaration, there are a few additional
4886 * semantic checks that must be applied. In addition, variable that was
4887 * created for the declaration should be added to the IR stream.
4889 if (earlier
== NULL
) {
4890 validate_identifier(decl
->identifier
, loc
, state
);
4892 /* Add the variable to the symbol table. Note that the initializer's
4893 * IR was already processed earlier (though it hasn't been emitted
4894 * yet), without the variable in scope.
4896 * This differs from most C-like languages, but it follows the GLSL
4897 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4900 * "Within a declaration, the scope of a name starts immediately
4901 * after the initializer if present or immediately after the name
4902 * being declared if not."
4904 if (!state
->symbols
->add_variable(var
)) {
4905 YYLTYPE loc
= this->get_location();
4906 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4907 "current scope", decl
->identifier
);
4911 /* Push the variable declaration to the top. It means that all the
4912 * variable declarations will appear in a funny last-to-first order,
4913 * but otherwise we run into trouble if a function is prototyped, a
4914 * global var is decled, then the function is defined with usage of
4915 * the global var. See glslparsertest's CorrectModule.frag.
4917 instructions
->push_head(var
);
4920 instructions
->append_list(&initializer_instructions
);
4924 /* Generally, variable declarations do not have r-values. However,
4925 * one is used for the declaration in
4927 * while (bool b = some_condition()) {
4931 * so we return the rvalue from the last seen declaration here.
4938 ast_parameter_declarator::hir(exec_list
*instructions
,
4939 struct _mesa_glsl_parse_state
*state
)
4942 const struct glsl_type
*type
;
4943 const char *name
= NULL
;
4944 YYLTYPE loc
= this->get_location();
4946 type
= this->type
->glsl_type(& name
, state
);
4950 _mesa_glsl_error(& loc
, state
,
4951 "invalid type `%s' in declaration of `%s'",
4952 name
, this->identifier
);
4954 _mesa_glsl_error(& loc
, state
,
4955 "invalid type in declaration of `%s'",
4959 type
= glsl_type::error_type
;
4962 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4964 * "Functions that accept no input arguments need not use void in the
4965 * argument list because prototypes (or definitions) are required and
4966 * therefore there is no ambiguity when an empty argument list "( )" is
4967 * declared. The idiom "(void)" as a parameter list is provided for
4970 * Placing this check here prevents a void parameter being set up
4971 * for a function, which avoids tripping up checks for main taking
4972 * parameters and lookups of an unnamed symbol.
4974 if (type
->is_void()) {
4975 if (this->identifier
!= NULL
)
4976 _mesa_glsl_error(& loc
, state
,
4977 "named parameter cannot have type `void'");
4983 if (formal_parameter
&& (this->identifier
== NULL
)) {
4984 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4988 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4989 * call already handled the "vec4[..] foo" case.
4991 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4993 if (!type
->is_error() && type
->is_unsized_array()) {
4994 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4996 type
= glsl_type::error_type
;
5000 ir_variable
*var
= new(ctx
)
5001 ir_variable(type
, this->identifier
, ir_var_function_in
);
5003 /* Apply any specified qualifiers to the parameter declaration. Note that
5004 * for function parameters the default mode is 'in'.
5006 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5009 /* From section 4.1.7 of the GLSL 4.40 spec:
5011 * "Opaque variables cannot be treated as l-values; hence cannot
5012 * be used as out or inout function parameters, nor can they be
5015 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5016 && type
->contains_opaque()) {
5017 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5018 "contain opaque variables");
5019 type
= glsl_type::error_type
;
5022 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5024 * "When calling a function, expressions that do not evaluate to
5025 * l-values cannot be passed to parameters declared as out or inout."
5027 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5029 * "Other binary or unary expressions, non-dereferenced arrays,
5030 * function names, swizzles with repeated fields, and constants
5031 * cannot be l-values."
5033 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5034 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5036 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5038 && !state
->check_version(120, 100, &loc
,
5039 "arrays cannot be out or inout parameters")) {
5040 type
= glsl_type::error_type
;
5043 instructions
->push_tail(var
);
5045 /* Parameter declarations do not have r-values.
5052 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5054 exec_list
*ir_parameters
,
5055 _mesa_glsl_parse_state
*state
)
5057 ast_parameter_declarator
*void_param
= NULL
;
5060 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5061 param
->formal_parameter
= formal
;
5062 param
->hir(ir_parameters
, state
);
5070 if ((void_param
!= NULL
) && (count
> 1)) {
5071 YYLTYPE loc
= void_param
->get_location();
5073 _mesa_glsl_error(& loc
, state
,
5074 "`void' parameter must be only parameter");
5080 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5082 /* IR invariants disallow function declarations or definitions
5083 * nested within other function definitions. But there is no
5084 * requirement about the relative order of function declarations
5085 * and definitions with respect to one another. So simply insert
5086 * the new ir_function block at the end of the toplevel instruction
5089 state
->toplevel_ir
->push_tail(f
);
5094 ast_function::hir(exec_list
*instructions
,
5095 struct _mesa_glsl_parse_state
*state
)
5098 ir_function
*f
= NULL
;
5099 ir_function_signature
*sig
= NULL
;
5100 exec_list hir_parameters
;
5101 YYLTYPE loc
= this->get_location();
5103 const char *const name
= identifier
;
5105 /* New functions are always added to the top-level IR instruction stream,
5106 * so this instruction list pointer is ignored. See also emit_function
5109 (void) instructions
;
5111 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5113 * "Function declarations (prototypes) cannot occur inside of functions;
5114 * they must be at global scope, or for the built-in functions, outside
5115 * the global scope."
5117 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5119 * "User defined functions may only be defined within the global scope."
5121 * Note that this language does not appear in GLSL 1.10.
5123 if ((state
->current_function
!= NULL
) &&
5124 state
->is_version(120, 100)) {
5125 YYLTYPE loc
= this->get_location();
5126 _mesa_glsl_error(&loc
, state
,
5127 "declaration of function `%s' not allowed within "
5128 "function body", name
);
5131 validate_identifier(name
, this->get_location(), state
);
5133 /* Convert the list of function parameters to HIR now so that they can be
5134 * used below to compare this function's signature with previously seen
5135 * signatures for functions with the same name.
5137 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5139 & hir_parameters
, state
);
5141 const char *return_type_name
;
5142 const glsl_type
*return_type
=
5143 this->return_type
->glsl_type(& return_type_name
, state
);
5146 YYLTYPE loc
= this->get_location();
5147 _mesa_glsl_error(&loc
, state
,
5148 "function `%s' has undeclared return type `%s'",
5149 name
, return_type_name
);
5150 return_type
= glsl_type::error_type
;
5153 /* ARB_shader_subroutine states:
5154 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5155 * subroutine(...) to a function declaration."
5157 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5158 YYLTYPE loc
= this->get_location();
5159 _mesa_glsl_error(&loc
, state
,
5160 "function declaration `%s' cannot have subroutine prepended",
5164 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5165 * "No qualifier is allowed on the return type of a function."
5167 if (this->return_type
->has_qualifiers(state
)) {
5168 YYLTYPE loc
= this->get_location();
5169 _mesa_glsl_error(& loc
, state
,
5170 "function `%s' return type has qualifiers", name
);
5173 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5175 * "Arrays are allowed as arguments and as the return type. In both
5176 * cases, the array must be explicitly sized."
5178 if (return_type
->is_unsized_array()) {
5179 YYLTYPE loc
= this->get_location();
5180 _mesa_glsl_error(& loc
, state
,
5181 "function `%s' return type array must be explicitly "
5185 /* From section 4.1.7 of the GLSL 4.40 spec:
5187 * "[Opaque types] can only be declared as function parameters
5188 * or uniform-qualified variables."
5190 if (return_type
->contains_opaque()) {
5191 YYLTYPE loc
= this->get_location();
5192 _mesa_glsl_error(&loc
, state
,
5193 "function `%s' return type can't contain an opaque type",
5197 /* Create an ir_function if one doesn't already exist. */
5198 f
= state
->symbols
->get_function(name
);
5200 f
= new(ctx
) ir_function(name
);
5201 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5202 if (!state
->symbols
->add_function(f
)) {
5203 /* This function name shadows a non-function use of the same name. */
5204 YYLTYPE loc
= this->get_location();
5205 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5206 "non-function", name
);
5210 emit_function(state
, f
);
5213 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5215 * "A shader cannot redefine or overload built-in functions."
5217 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5219 * "User code can overload the built-in functions but cannot redefine
5222 if (state
->es_shader
&& state
->language_version
>= 300) {
5223 /* Local shader has no exact candidates; check the built-ins. */
5224 _mesa_glsl_initialize_builtin_functions();
5225 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5226 YYLTYPE loc
= this->get_location();
5227 _mesa_glsl_error(& loc
, state
,
5228 "A shader cannot redefine or overload built-in "
5229 "function `%s' in GLSL ES 3.00", name
);
5234 /* Verify that this function's signature either doesn't match a previously
5235 * seen signature for a function with the same name, or, if a match is found,
5236 * that the previously seen signature does not have an associated definition.
5238 if (state
->es_shader
|| f
->has_user_signature()) {
5239 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5241 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5242 if (badvar
!= NULL
) {
5243 YYLTYPE loc
= this->get_location();
5245 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5246 "qualifiers don't match prototype", name
, badvar
);
5249 if (sig
->return_type
!= return_type
) {
5250 YYLTYPE loc
= this->get_location();
5252 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5253 "match prototype", name
);
5256 if (sig
->is_defined
) {
5257 if (is_definition
) {
5258 YYLTYPE loc
= this->get_location();
5259 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5261 /* We just encountered a prototype that exactly matches a
5262 * function that's already been defined. This is redundant,
5263 * and we should ignore it.
5271 /* Verify the return type of main() */
5272 if (strcmp(name
, "main") == 0) {
5273 if (! return_type
->is_void()) {
5274 YYLTYPE loc
= this->get_location();
5276 _mesa_glsl_error(& loc
, state
, "main() must return void");
5279 if (!hir_parameters
.is_empty()) {
5280 YYLTYPE loc
= this->get_location();
5282 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5286 /* Finish storing the information about this new function in its signature.
5289 sig
= new(ctx
) ir_function_signature(return_type
);
5290 f
->add_signature(sig
);
5293 sig
->replace_parameters(&hir_parameters
);
5296 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5299 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5300 unsigned qual_index
;
5301 if (process_qualifier_constant(state
, &loc
, "index",
5302 this->return_type
->qualifier
.index
,
5304 if (!state
->has_explicit_uniform_location()) {
5305 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5306 "GL_ARB_explicit_uniform_location or "
5308 } else if (qual_index
>= MAX_SUBROUTINES
) {
5309 _mesa_glsl_error(&loc
, state
,
5310 "invalid subroutine index (%d) index must "
5311 "be a number between 0 and "
5312 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5313 MAX_SUBROUTINES
- 1);
5315 f
->subroutine_index
= qual_index
;
5320 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5321 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5322 f
->num_subroutine_types
);
5324 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5325 const struct glsl_type
*type
;
5326 /* the subroutine type must be already declared */
5327 type
= state
->symbols
->get_type(decl
->identifier
);
5329 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5331 f
->subroutine_types
[idx
++] = type
;
5333 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5335 state
->num_subroutines
+ 1);
5336 state
->subroutines
[state
->num_subroutines
] = f
;
5337 state
->num_subroutines
++;
5341 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5342 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5343 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5346 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5348 state
->num_subroutine_types
+ 1);
5349 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5350 state
->num_subroutine_types
++;
5352 f
->is_subroutine
= true;
5355 /* Function declarations (prototypes) do not have r-values.
5362 ast_function_definition::hir(exec_list
*instructions
,
5363 struct _mesa_glsl_parse_state
*state
)
5365 prototype
->is_definition
= true;
5366 prototype
->hir(instructions
, state
);
5368 ir_function_signature
*signature
= prototype
->signature
;
5369 if (signature
== NULL
)
5372 assert(state
->current_function
== NULL
);
5373 state
->current_function
= signature
;
5374 state
->found_return
= false;
5376 /* Duplicate parameters declared in the prototype as concrete variables.
5377 * Add these to the symbol table.
5379 state
->symbols
->push_scope();
5380 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5381 assert(var
->as_variable() != NULL
);
5383 /* The only way a parameter would "exist" is if two parameters have
5386 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5387 YYLTYPE loc
= this->get_location();
5389 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5391 state
->symbols
->add_variable(var
);
5395 /* Convert the body of the function to HIR. */
5396 this->body
->hir(&signature
->body
, state
);
5397 signature
->is_defined
= true;
5399 state
->symbols
->pop_scope();
5401 assert(state
->current_function
== signature
);
5402 state
->current_function
= NULL
;
5404 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5405 YYLTYPE loc
= this->get_location();
5406 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5407 "%s, but no return statement",
5408 signature
->function_name(),
5409 signature
->return_type
->name
);
5412 /* Function definitions do not have r-values.
5419 ast_jump_statement::hir(exec_list
*instructions
,
5420 struct _mesa_glsl_parse_state
*state
)
5427 assert(state
->current_function
);
5429 if (opt_return_value
) {
5430 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5432 /* The value of the return type can be NULL if the shader says
5433 * 'return foo();' and foo() is a function that returns void.
5435 * NOTE: The GLSL spec doesn't say that this is an error. The type
5436 * of the return value is void. If the return type of the function is
5437 * also void, then this should compile without error. Seriously.
5439 const glsl_type
*const ret_type
=
5440 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5442 /* Implicit conversions are not allowed for return values prior to
5443 * ARB_shading_language_420pack.
5445 if (state
->current_function
->return_type
!= ret_type
) {
5446 YYLTYPE loc
= this->get_location();
5448 if (state
->has_420pack()) {
5449 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5451 _mesa_glsl_error(& loc
, state
,
5452 "could not implicitly convert return value "
5453 "to %s, in function `%s'",
5454 state
->current_function
->return_type
->name
,
5455 state
->current_function
->function_name());
5458 _mesa_glsl_error(& loc
, state
,
5459 "`return' with wrong type %s, in function `%s' "
5462 state
->current_function
->function_name(),
5463 state
->current_function
->return_type
->name
);
5465 } else if (state
->current_function
->return_type
->base_type
==
5467 YYLTYPE loc
= this->get_location();
5469 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5470 * specs add a clarification:
5472 * "A void function can only use return without a return argument, even if
5473 * the return argument has void type. Return statements only accept values:
5476 * void func2() { return func1(); } // illegal return statement"
5478 _mesa_glsl_error(& loc
, state
,
5479 "void functions can only use `return' without a "
5483 inst
= new(ctx
) ir_return(ret
);
5485 if (state
->current_function
->return_type
->base_type
!=
5487 YYLTYPE loc
= this->get_location();
5489 _mesa_glsl_error(& loc
, state
,
5490 "`return' with no value, in function %s returning "
5492 state
->current_function
->function_name());
5494 inst
= new(ctx
) ir_return
;
5497 state
->found_return
= true;
5498 instructions
->push_tail(inst
);
5503 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5504 YYLTYPE loc
= this->get_location();
5506 _mesa_glsl_error(& loc
, state
,
5507 "`discard' may only appear in a fragment shader");
5509 instructions
->push_tail(new(ctx
) ir_discard
);
5514 if (mode
== ast_continue
&&
5515 state
->loop_nesting_ast
== NULL
) {
5516 YYLTYPE loc
= this->get_location();
5518 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5519 } else if (mode
== ast_break
&&
5520 state
->loop_nesting_ast
== NULL
&&
5521 state
->switch_state
.switch_nesting_ast
== NULL
) {
5522 YYLTYPE loc
= this->get_location();
5524 _mesa_glsl_error(& loc
, state
,
5525 "break may only appear in a loop or a switch");
5527 /* For a loop, inline the for loop expression again, since we don't
5528 * know where near the end of the loop body the normal copy of it is
5529 * going to be placed. Same goes for the condition for a do-while
5532 if (state
->loop_nesting_ast
!= NULL
&&
5533 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5534 if (state
->loop_nesting_ast
->rest_expression
) {
5535 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5538 if (state
->loop_nesting_ast
->mode
==
5539 ast_iteration_statement::ast_do_while
) {
5540 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5544 if (state
->switch_state
.is_switch_innermost
&&
5545 mode
== ast_continue
) {
5546 /* Set 'continue_inside' to true. */
5547 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5548 ir_dereference_variable
*deref_continue_inside_var
=
5549 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5550 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5553 /* Break out from the switch, continue for the loop will
5554 * be called right after switch. */
5555 ir_loop_jump
*const jump
=
5556 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5557 instructions
->push_tail(jump
);
5559 } else if (state
->switch_state
.is_switch_innermost
&&
5560 mode
== ast_break
) {
5561 /* Force break out of switch by inserting a break. */
5562 ir_loop_jump
*const jump
=
5563 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5564 instructions
->push_tail(jump
);
5566 ir_loop_jump
*const jump
=
5567 new(ctx
) ir_loop_jump((mode
== ast_break
)
5568 ? ir_loop_jump::jump_break
5569 : ir_loop_jump::jump_continue
);
5570 instructions
->push_tail(jump
);
5577 /* Jump instructions do not have r-values.
5584 ast_selection_statement::hir(exec_list
*instructions
,
5585 struct _mesa_glsl_parse_state
*state
)
5589 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5591 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5593 * "Any expression whose type evaluates to a Boolean can be used as the
5594 * conditional expression bool-expression. Vector types are not accepted
5595 * as the expression to if."
5597 * The checks are separated so that higher quality diagnostics can be
5598 * generated for cases where both rules are violated.
5600 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5601 YYLTYPE loc
= this->condition
->get_location();
5603 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5607 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5609 if (then_statement
!= NULL
) {
5610 state
->symbols
->push_scope();
5611 then_statement
->hir(& stmt
->then_instructions
, state
);
5612 state
->symbols
->pop_scope();
5615 if (else_statement
!= NULL
) {
5616 state
->symbols
->push_scope();
5617 else_statement
->hir(& stmt
->else_instructions
, state
);
5618 state
->symbols
->pop_scope();
5621 instructions
->push_tail(stmt
);
5623 /* if-statements do not have r-values.
5630 ast_switch_statement::hir(exec_list
*instructions
,
5631 struct _mesa_glsl_parse_state
*state
)
5635 ir_rvalue
*const test_expression
=
5636 this->test_expression
->hir(instructions
, state
);
5638 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5640 * "The type of init-expression in a switch statement must be a
5643 if (!test_expression
->type
->is_scalar() ||
5644 !test_expression
->type
->is_integer()) {
5645 YYLTYPE loc
= this->test_expression
->get_location();
5647 _mesa_glsl_error(& loc
,
5649 "switch-statement expression must be scalar "
5653 /* Track the switch-statement nesting in a stack-like manner.
5655 struct glsl_switch_state saved
= state
->switch_state
;
5657 state
->switch_state
.is_switch_innermost
= true;
5658 state
->switch_state
.switch_nesting_ast
= this;
5659 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5660 hash_table_pointer_compare
);
5661 state
->switch_state
.previous_default
= NULL
;
5663 /* Initalize is_fallthru state to false.
5665 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5666 state
->switch_state
.is_fallthru_var
=
5667 new(ctx
) ir_variable(glsl_type::bool_type
,
5668 "switch_is_fallthru_tmp",
5670 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5672 ir_dereference_variable
*deref_is_fallthru_var
=
5673 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5674 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5677 /* Initialize continue_inside state to false.
5679 state
->switch_state
.continue_inside
=
5680 new(ctx
) ir_variable(glsl_type::bool_type
,
5681 "continue_inside_tmp",
5683 instructions
->push_tail(state
->switch_state
.continue_inside
);
5685 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5686 ir_dereference_variable
*deref_continue_inside_var
=
5687 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5688 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5691 state
->switch_state
.run_default
=
5692 new(ctx
) ir_variable(glsl_type::bool_type
,
5695 instructions
->push_tail(state
->switch_state
.run_default
);
5697 /* Loop around the switch is used for flow control. */
5698 ir_loop
* loop
= new(ctx
) ir_loop();
5699 instructions
->push_tail(loop
);
5701 /* Cache test expression.
5703 test_to_hir(&loop
->body_instructions
, state
);
5705 /* Emit code for body of switch stmt.
5707 body
->hir(&loop
->body_instructions
, state
);
5709 /* Insert a break at the end to exit loop. */
5710 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5711 loop
->body_instructions
.push_tail(jump
);
5713 /* If we are inside loop, check if continue got called inside switch. */
5714 if (state
->loop_nesting_ast
!= NULL
) {
5715 ir_dereference_variable
*deref_continue_inside
=
5716 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5717 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5718 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5720 if (state
->loop_nesting_ast
!= NULL
) {
5721 if (state
->loop_nesting_ast
->rest_expression
) {
5722 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5725 if (state
->loop_nesting_ast
->mode
==
5726 ast_iteration_statement::ast_do_while
) {
5727 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5730 irif
->then_instructions
.push_tail(jump
);
5731 instructions
->push_tail(irif
);
5734 hash_table_dtor(state
->switch_state
.labels_ht
);
5736 state
->switch_state
= saved
;
5738 /* Switch statements do not have r-values. */
5744 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5745 struct _mesa_glsl_parse_state
*state
)
5749 /* Cache value of test expression. */
5750 ir_rvalue
*const test_val
=
5751 test_expression
->hir(instructions
,
5754 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5757 ir_dereference_variable
*deref_test_var
=
5758 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5760 instructions
->push_tail(state
->switch_state
.test_var
);
5761 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5766 ast_switch_body::hir(exec_list
*instructions
,
5767 struct _mesa_glsl_parse_state
*state
)
5770 stmts
->hir(instructions
, state
);
5772 /* Switch bodies do not have r-values. */
5777 ast_case_statement_list::hir(exec_list
*instructions
,
5778 struct _mesa_glsl_parse_state
*state
)
5780 exec_list default_case
, after_default
, tmp
;
5782 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5783 case_stmt
->hir(&tmp
, state
);
5786 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5787 default_case
.append_list(&tmp
);
5791 /* If default case found, append 'after_default' list. */
5792 if (!default_case
.is_empty())
5793 after_default
.append_list(&tmp
);
5795 instructions
->append_list(&tmp
);
5798 /* Handle the default case. This is done here because default might not be
5799 * the last case. We need to add checks against following cases first to see
5800 * if default should be chosen or not.
5802 if (!default_case
.is_empty()) {
5804 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5805 ir_dereference_variable
*deref_run_default_var
=
5806 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5808 /* Choose to run default case initially, following conditional
5809 * assignments might change this.
5811 ir_assignment
*const init_var
=
5812 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5813 instructions
->push_tail(init_var
);
5815 /* Default case was the last one, no checks required. */
5816 if (after_default
.is_empty()) {
5817 instructions
->append_list(&default_case
);
5821 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5822 ir_assignment
*assign
= ir
->as_assignment();
5827 /* Clone the check between case label and init expression. */
5828 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5829 ir_expression
*clone
= exp
->clone(state
, NULL
);
5831 ir_dereference_variable
*deref_var
=
5832 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5833 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5835 ir_assignment
*const set_false
=
5836 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5838 instructions
->push_tail(set_false
);
5841 /* Append default case and all cases after it. */
5842 instructions
->append_list(&default_case
);
5843 instructions
->append_list(&after_default
);
5846 /* Case statements do not have r-values. */
5851 ast_case_statement::hir(exec_list
*instructions
,
5852 struct _mesa_glsl_parse_state
*state
)
5854 labels
->hir(instructions
, state
);
5856 /* Guard case statements depending on fallthru state. */
5857 ir_dereference_variable
*const deref_fallthru_guard
=
5858 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5859 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5861 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5862 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5864 instructions
->push_tail(test_fallthru
);
5866 /* Case statements do not have r-values. */
5872 ast_case_label_list::hir(exec_list
*instructions
,
5873 struct _mesa_glsl_parse_state
*state
)
5875 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5876 label
->hir(instructions
, state
);
5878 /* Case labels do not have r-values. */
5883 ast_case_label::hir(exec_list
*instructions
,
5884 struct _mesa_glsl_parse_state
*state
)
5888 ir_dereference_variable
*deref_fallthru_var
=
5889 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5891 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5893 /* If not default case, ... */
5894 if (this->test_value
!= NULL
) {
5895 /* Conditionally set fallthru state based on
5896 * comparison of cached test expression value to case label.
5898 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5899 ir_constant
*label_const
= label_rval
->constant_expression_value();
5902 YYLTYPE loc
= this->test_value
->get_location();
5904 _mesa_glsl_error(& loc
, state
,
5905 "switch statement case label must be a "
5906 "constant expression");
5908 /* Stuff a dummy value in to allow processing to continue. */
5909 label_const
= new(ctx
) ir_constant(0);
5911 ast_expression
*previous_label
= (ast_expression
*)
5912 hash_table_find(state
->switch_state
.labels_ht
,
5913 (void *)(uintptr_t)label_const
->value
.u
[0]);
5915 if (previous_label
) {
5916 YYLTYPE loc
= this->test_value
->get_location();
5917 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5919 loc
= previous_label
->get_location();
5920 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5922 hash_table_insert(state
->switch_state
.labels_ht
,
5924 (void *)(uintptr_t)label_const
->value
.u
[0]);
5928 ir_dereference_variable
*deref_test_var
=
5929 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5931 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5936 * From GLSL 4.40 specification section 6.2 ("Selection"):
5938 * "The type of the init-expression value in a switch statement must
5939 * be a scalar int or uint. The type of the constant-expression value
5940 * in a case label also must be a scalar int or uint. When any pair
5941 * of these values is tested for "equal value" and the types do not
5942 * match, an implicit conversion will be done to convert the int to a
5943 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5946 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5947 YYLTYPE loc
= this->test_value
->get_location();
5949 const glsl_type
*type_a
= label_const
->type
;
5950 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5952 /* Check if int->uint implicit conversion is supported. */
5953 bool integer_conversion_supported
=
5954 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5957 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5958 !integer_conversion_supported
) {
5959 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5960 "init-expression and case label (%s != %s)",
5961 type_a
->name
, type_b
->name
);
5963 /* Conversion of the case label. */
5964 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5965 if (!apply_implicit_conversion(glsl_type::uint_type
,
5966 test_cond
->operands
[0], state
))
5967 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5969 /* Conversion of the init-expression value. */
5970 if (!apply_implicit_conversion(glsl_type::uint_type
,
5971 test_cond
->operands
[1], state
))
5972 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5977 ir_assignment
*set_fallthru_on_test
=
5978 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5980 instructions
->push_tail(set_fallthru_on_test
);
5981 } else { /* default case */
5982 if (state
->switch_state
.previous_default
) {
5983 YYLTYPE loc
= this->get_location();
5984 _mesa_glsl_error(& loc
, state
,
5985 "multiple default labels in one switch");
5987 loc
= state
->switch_state
.previous_default
->get_location();
5988 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5990 state
->switch_state
.previous_default
= this;
5992 /* Set fallthru condition on 'run_default' bool. */
5993 ir_dereference_variable
*deref_run_default
=
5994 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5995 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5996 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6000 /* Set falltrhu state. */
6001 ir_assignment
*set_fallthru
=
6002 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6004 instructions
->push_tail(set_fallthru
);
6007 /* Case statements do not have r-values. */
6012 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6013 struct _mesa_glsl_parse_state
*state
)
6017 if (condition
!= NULL
) {
6018 ir_rvalue
*const cond
=
6019 condition
->hir(instructions
, state
);
6022 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6023 YYLTYPE loc
= condition
->get_location();
6025 _mesa_glsl_error(& loc
, state
,
6026 "loop condition must be scalar boolean");
6028 /* As the first code in the loop body, generate a block that looks
6029 * like 'if (!condition) break;' as the loop termination condition.
6031 ir_rvalue
*const not_cond
=
6032 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6034 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6036 ir_jump
*const break_stmt
=
6037 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6039 if_stmt
->then_instructions
.push_tail(break_stmt
);
6040 instructions
->push_tail(if_stmt
);
6047 ast_iteration_statement::hir(exec_list
*instructions
,
6048 struct _mesa_glsl_parse_state
*state
)
6052 /* For-loops and while-loops start a new scope, but do-while loops do not.
6054 if (mode
!= ast_do_while
)
6055 state
->symbols
->push_scope();
6057 if (init_statement
!= NULL
)
6058 init_statement
->hir(instructions
, state
);
6060 ir_loop
*const stmt
= new(ctx
) ir_loop();
6061 instructions
->push_tail(stmt
);
6063 /* Track the current loop nesting. */
6064 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6066 state
->loop_nesting_ast
= this;
6068 /* Likewise, indicate that following code is closest to a loop,
6069 * NOT closest to a switch.
6071 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6072 state
->switch_state
.is_switch_innermost
= false;
6074 if (mode
!= ast_do_while
)
6075 condition_to_hir(&stmt
->body_instructions
, state
);
6078 body
->hir(& stmt
->body_instructions
, state
);
6080 if (rest_expression
!= NULL
)
6081 rest_expression
->hir(& stmt
->body_instructions
, state
);
6083 if (mode
== ast_do_while
)
6084 condition_to_hir(&stmt
->body_instructions
, state
);
6086 if (mode
!= ast_do_while
)
6087 state
->symbols
->pop_scope();
6089 /* Restore previous nesting before returning. */
6090 state
->loop_nesting_ast
= nesting_ast
;
6091 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6093 /* Loops do not have r-values.
6100 * Determine if the given type is valid for establishing a default precision
6103 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6105 * "The precision statement
6107 * precision precision-qualifier type;
6109 * can be used to establish a default precision qualifier. The type field
6110 * can be either int or float or any of the sampler types, and the
6111 * precision-qualifier can be lowp, mediump, or highp."
6113 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6114 * qualifiers on sampler types, but this seems like an oversight (since the
6115 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6116 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6120 is_valid_default_precision_type(const struct glsl_type
*const type
)
6125 switch (type
->base_type
) {
6127 case GLSL_TYPE_FLOAT
:
6128 /* "int" and "float" are valid, but vectors and matrices are not. */
6129 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6130 case GLSL_TYPE_SAMPLER
:
6131 case GLSL_TYPE_IMAGE
:
6132 case GLSL_TYPE_ATOMIC_UINT
:
6141 ast_type_specifier::hir(exec_list
*instructions
,
6142 struct _mesa_glsl_parse_state
*state
)
6144 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6147 YYLTYPE loc
= this->get_location();
6149 /* If this is a precision statement, check that the type to which it is
6150 * applied is either float or int.
6152 * From section 4.5.3 of the GLSL 1.30 spec:
6153 * "The precision statement
6154 * precision precision-qualifier type;
6155 * can be used to establish a default precision qualifier. The type
6156 * field can be either int or float [...]. Any other types or
6157 * qualifiers will result in an error.
6159 if (this->default_precision
!= ast_precision_none
) {
6160 if (!state
->check_precision_qualifiers_allowed(&loc
))
6163 if (this->structure
!= NULL
) {
6164 _mesa_glsl_error(&loc
, state
,
6165 "precision qualifiers do not apply to structures");
6169 if (this->array_specifier
!= NULL
) {
6170 _mesa_glsl_error(&loc
, state
,
6171 "default precision statements do not apply to "
6176 const struct glsl_type
*const type
=
6177 state
->symbols
->get_type(this->type_name
);
6178 if (!is_valid_default_precision_type(type
)) {
6179 _mesa_glsl_error(&loc
, state
,
6180 "default precision statements apply only to "
6181 "float, int, and opaque types");
6185 if (state
->es_shader
) {
6186 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6189 * "Non-precision qualified declarations will use the precision
6190 * qualifier specified in the most recent precision statement
6191 * that is still in scope. The precision statement has the same
6192 * scoping rules as variable declarations. If it is declared
6193 * inside a compound statement, its effect stops at the end of
6194 * the innermost statement it was declared in. Precision
6195 * statements in nested scopes override precision statements in
6196 * outer scopes. Multiple precision statements for the same basic
6197 * type can appear inside the same scope, with later statements
6198 * overriding earlier statements within that scope."
6200 * Default precision specifications follow the same scope rules as
6201 * variables. So, we can track the state of the default precision
6202 * qualifiers in the symbol table, and the rules will just work. This
6203 * is a slight abuse of the symbol table, but it has the semantics
6206 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6207 this->default_precision
);
6210 /* FINISHME: Translate precision statements into IR. */
6214 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6215 * process_record_constructor() can do type-checking on C-style initializer
6216 * expressions of structs, but ast_struct_specifier should only be translated
6217 * to HIR if it is declaring the type of a structure.
6219 * The ->is_declaration field is false for initializers of variables
6220 * declared separately from the struct's type definition.
6222 * struct S { ... }; (is_declaration = true)
6223 * struct T { ... } t = { ... }; (is_declaration = true)
6224 * S s = { ... }; (is_declaration = false)
6226 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6227 return this->structure
->hir(instructions
, state
);
6234 * Process a structure or interface block tree into an array of structure fields
6236 * After parsing, where there are some syntax differnces, structures and
6237 * interface blocks are almost identical. They are similar enough that the
6238 * AST for each can be processed the same way into a set of
6239 * \c glsl_struct_field to describe the members.
6241 * If we're processing an interface block, var_mode should be the type of the
6242 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6243 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6247 * The number of fields processed. A pointer to the array structure fields is
6248 * stored in \c *fields_ret.
6251 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6252 struct _mesa_glsl_parse_state
*state
,
6253 exec_list
*declarations
,
6254 glsl_struct_field
**fields_ret
,
6256 enum glsl_matrix_layout matrix_layout
,
6257 bool allow_reserved_names
,
6258 ir_variable_mode var_mode
,
6259 ast_type_qualifier
*layout
,
6260 unsigned block_stream
,
6261 unsigned expl_location
,
6262 unsigned expl_align
)
6264 unsigned decl_count
= 0;
6265 unsigned next_offset
= 0;
6267 /* Make an initial pass over the list of fields to determine how
6268 * many there are. Each element in this list is an ast_declarator_list.
6269 * This means that we actually need to count the number of elements in the
6270 * 'declarations' list in each of the elements.
6272 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6273 decl_count
+= decl_list
->declarations
.length();
6276 /* Allocate storage for the fields and process the field
6277 * declarations. As the declarations are processed, try to also convert
6278 * the types to HIR. This ensures that structure definitions embedded in
6279 * other structure definitions or in interface blocks are processed.
6281 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6284 bool first_member
= true;
6285 bool first_member_has_explicit_location
= false;
6288 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6289 const char *type_name
;
6290 YYLTYPE loc
= decl_list
->get_location();
6292 decl_list
->type
->specifier
->hir(instructions
, state
);
6294 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6296 * "Anonymous structures are not supported; so embedded structures
6297 * must have a declarator. A name given to an embedded struct is
6298 * scoped at the same level as the struct it is embedded in."
6300 * The same section of the GLSL 1.20 spec says:
6302 * "Anonymous structures are not supported. Embedded structures are
6305 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6306 * embedded structures in 1.10 only.
6308 if (state
->language_version
!= 110 &&
6309 decl_list
->type
->specifier
->structure
!= NULL
)
6310 _mesa_glsl_error(&loc
, state
,
6311 "embedded structure declarations are not allowed");
6313 const glsl_type
*decl_type
=
6314 decl_list
->type
->glsl_type(& type_name
, state
);
6316 const struct ast_type_qualifier
*const qual
=
6317 &decl_list
->type
->qualifier
;
6319 /* From section 4.3.9 of the GLSL 4.40 spec:
6321 * "[In interface blocks] opaque types are not allowed."
6323 * It should be impossible for decl_type to be NULL here. Cases that
6324 * might naturally lead to decl_type being NULL, especially for the
6325 * is_interface case, will have resulted in compilation having
6326 * already halted due to a syntax error.
6331 if (decl_type
->contains_opaque()) {
6332 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6333 "interface block contains opaque variable");
6336 if (decl_type
->contains_atomic()) {
6337 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6339 * "Members of structures cannot be declared as atomic counter
6342 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6345 if (decl_type
->contains_image()) {
6346 /* FINISHME: Same problem as with atomic counters.
6347 * FINISHME: Request clarification from Khronos and add
6348 * FINISHME: spec quotation here.
6350 _mesa_glsl_error(&loc
, state
, "image in structure");
6354 if (qual
->flags
.q
.explicit_binding
) {
6355 _mesa_glsl_error(&loc
, state
,
6356 "binding layout qualifier cannot be applied "
6357 "to struct or interface block members");
6361 if (!first_member
) {
6362 if (!layout
->flags
.q
.explicit_location
&&
6363 ((first_member_has_explicit_location
&&
6364 !qual
->flags
.q
.explicit_location
) ||
6365 (!first_member_has_explicit_location
&&
6366 qual
->flags
.q
.explicit_location
))) {
6367 _mesa_glsl_error(&loc
, state
,
6368 "when block-level location layout qualifier "
6369 "is not supplied either all members must "
6370 "have a location layout qualifier or all "
6371 "members must not have a location layout "
6375 first_member
= false;
6376 first_member_has_explicit_location
=
6377 qual
->flags
.q
.explicit_location
;
6381 if (qual
->flags
.q
.std140
||
6382 qual
->flags
.q
.std430
||
6383 qual
->flags
.q
.packed
||
6384 qual
->flags
.q
.shared
) {
6385 _mesa_glsl_error(&loc
, state
,
6386 "uniform/shader storage block layout qualifiers "
6387 "std140, std430, packed, and shared can only be "
6388 "applied to uniform/shader storage blocks, not "
6392 if (qual
->flags
.q
.constant
) {
6393 _mesa_glsl_error(&loc
, state
,
6394 "const storage qualifier cannot be applied "
6395 "to struct or interface block members");
6398 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6400 * "A block member may be declared with a stream identifier, but
6401 * the specified stream must match the stream associated with the
6402 * containing block."
6404 if (qual
->flags
.q
.explicit_stream
) {
6405 unsigned qual_stream
;
6406 if (process_qualifier_constant(state
, &loc
, "stream",
6407 qual
->stream
, &qual_stream
) &&
6408 qual_stream
!= block_stream
) {
6409 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6410 "interface block member does not match "
6411 "the interface block (%u vs %u)", qual_stream
,
6416 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6417 _mesa_glsl_error(&loc
, state
,
6418 "interpolation qualifiers cannot be used "
6419 "with uniform interface blocks");
6422 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6423 qual
->has_auxiliary_storage()) {
6424 _mesa_glsl_error(&loc
, state
,
6425 "auxiliary storage qualifiers cannot be used "
6426 "in uniform blocks or structures.");
6429 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6430 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6431 _mesa_glsl_error(&loc
, state
,
6432 "row_major and column_major can only be "
6433 "applied to interface blocks");
6435 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6438 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6439 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6440 "readonly and writeonly.");
6443 foreach_list_typed (ast_declaration
, decl
, link
,
6444 &decl_list
->declarations
) {
6445 YYLTYPE loc
= decl
->get_location();
6447 if (!allow_reserved_names
)
6448 validate_identifier(decl
->identifier
, loc
, state
);
6450 const struct glsl_type
*field_type
=
6451 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6452 validate_array_dimensions(field_type
, state
, &loc
);
6453 fields
[i
].type
= field_type
;
6454 fields
[i
].name
= decl
->identifier
;
6455 fields
[i
].interpolation
=
6456 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
6457 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6458 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6459 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6460 fields
[i
].precision
= qual
->precision
;
6462 if (qual
->flags
.q
.explicit_location
) {
6463 unsigned qual_location
;
6464 if (process_qualifier_constant(state
, &loc
, "location",
6465 qual
->location
, &qual_location
)) {
6466 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6467 expl_location
= fields
[i
].location
+
6468 fields
[i
].type
->count_attribute_slots(false);
6471 if (layout
&& layout
->flags
.q
.explicit_location
) {
6472 fields
[i
].location
= expl_location
;
6473 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6475 fields
[i
].location
= -1;
6479 /* Offset can only be used with std430 and std140 layouts an initial
6480 * value of 0 is used for error detection.
6486 if (qual
->flags
.q
.row_major
||
6487 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6493 if(layout
->flags
.q
.std140
) {
6494 align
= field_type
->std140_base_alignment(row_major
);
6495 size
= field_type
->std140_size(row_major
);
6496 } else if (layout
->flags
.q
.std430
) {
6497 align
= field_type
->std430_base_alignment(row_major
);
6498 size
= field_type
->std430_size(row_major
);
6502 if (qual
->flags
.q
.explicit_offset
) {
6503 unsigned qual_offset
;
6504 if (process_qualifier_constant(state
, &loc
, "offset",
6505 qual
->offset
, &qual_offset
)) {
6506 if (align
!= 0 && size
!= 0) {
6507 if (next_offset
> qual_offset
)
6508 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6509 "offset overlaps previous member");
6511 if (qual_offset
% align
) {
6512 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6513 "must be a multiple of the base "
6514 "alignment of %s", field_type
->name
);
6516 fields
[i
].offset
= qual_offset
;
6517 next_offset
= glsl_align(qual_offset
+ size
, align
);
6519 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6520 "with std430 and std140 layouts");
6524 fields
[i
].offset
= -1;
6527 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6528 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6530 if (align
== 0 || size
== 0) {
6531 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6532 "std430 and std140 layouts");
6533 } else if (qual
->flags
.q
.explicit_align
) {
6534 unsigned member_align
;
6535 if (process_qualifier_constant(state
, &loc
, "align",
6536 qual
->align
, &member_align
)) {
6537 if (member_align
== 0 ||
6538 member_align
& (member_align
- 1)) {
6539 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6540 "in not a power of 2");
6542 fields
[i
].offset
= glsl_align(offset
, member_align
);
6543 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6547 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6548 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6552 if (!qual
->flags
.q
.explicit_offset
) {
6553 if (align
!= 0 && size
!= 0)
6554 next_offset
= glsl_align(next_offset
+ size
, align
);
6557 /* Propogate row- / column-major information down the fields of the
6558 * structure or interface block. Structures need this data because
6559 * the structure may contain a structure that contains ... a matrix
6560 * that need the proper layout.
6563 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6564 (field_type
->without_array()->is_matrix()
6565 || field_type
->without_array()->is_record())) {
6566 /* If no layout is specified for the field, inherit the layout
6569 fields
[i
].matrix_layout
= matrix_layout
;
6571 if (qual
->flags
.q
.row_major
)
6572 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6573 else if (qual
->flags
.q
.column_major
)
6574 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6576 /* If we're processing an uniform or buffer block, the matrix
6577 * layout must be decided by this point.
6579 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6580 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6583 /* Image qualifiers are allowed on buffer variables, which can only
6584 * be defined inside shader storage buffer objects
6586 if (layout
&& var_mode
== ir_var_shader_storage
) {
6587 /* For readonly and writeonly qualifiers the field definition,
6588 * if set, overwrites the layout qualifier.
6590 if (qual
->flags
.q
.read_only
) {
6591 fields
[i
].image_read_only
= true;
6592 fields
[i
].image_write_only
= false;
6593 } else if (qual
->flags
.q
.write_only
) {
6594 fields
[i
].image_read_only
= false;
6595 fields
[i
].image_write_only
= true;
6597 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6598 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6601 /* For other qualifiers, we set the flag if either the layout
6602 * qualifier or the field qualifier are set
6604 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6605 layout
->flags
.q
.coherent
;
6606 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6607 layout
->flags
.q
._volatile
;
6608 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6609 layout
->flags
.q
.restrict_flag
;
6616 assert(i
== decl_count
);
6618 *fields_ret
= fields
;
6624 ast_struct_specifier::hir(exec_list
*instructions
,
6625 struct _mesa_glsl_parse_state
*state
)
6627 YYLTYPE loc
= this->get_location();
6629 unsigned expl_location
= 0;
6630 if (layout
&& layout
->flags
.q
.explicit_location
) {
6631 if (!process_qualifier_constant(state
, &loc
, "location",
6632 layout
->location
, &expl_location
)) {
6635 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6639 glsl_struct_field
*fields
;
6640 unsigned decl_count
=
6641 ast_process_struct_or_iface_block_members(instructions
,
6643 &this->declarations
,
6646 GLSL_MATRIX_LAYOUT_INHERITED
,
6647 false /* allow_reserved_names */,
6650 0, /* for interface only */
6652 0 /* for interface only */);
6654 validate_identifier(this->name
, loc
, state
);
6656 const glsl_type
*t
=
6657 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6659 if (!state
->symbols
->add_type(name
, t
)) {
6660 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6662 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6664 state
->num_user_structures
+ 1);
6666 s
[state
->num_user_structures
] = t
;
6667 state
->user_structures
= s
;
6668 state
->num_user_structures
++;
6672 /* Structure type definitions do not have r-values.
6679 * Visitor class which detects whether a given interface block has been used.
6681 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6684 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6685 : mode(mode
), block(block
), found(false)
6689 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6691 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6695 return visit_continue
;
6698 bool usage_found() const
6704 ir_variable_mode mode
;
6705 const glsl_type
*block
;
6710 is_unsized_array_last_element(ir_variable
*v
)
6712 const glsl_type
*interface_type
= v
->get_interface_type();
6713 int length
= interface_type
->length
;
6715 assert(v
->type
->is_unsized_array());
6717 /* Check if it is the last element of the interface */
6718 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6724 ast_interface_block::hir(exec_list
*instructions
,
6725 struct _mesa_glsl_parse_state
*state
)
6727 YYLTYPE loc
= this->get_location();
6729 /* Interface blocks must be declared at global scope */
6730 if (state
->current_function
!= NULL
) {
6731 _mesa_glsl_error(&loc
, state
,
6732 "Interface block `%s' must be declared "
6737 if (!this->layout
.flags
.q
.buffer
&&
6738 this->layout
.flags
.q
.std430
) {
6739 _mesa_glsl_error(&loc
, state
,
6740 "std430 storage block layout qualifier is supported "
6741 "only for shader storage blocks");
6744 /* The ast_interface_block has a list of ast_declarator_lists. We
6745 * need to turn those into ir_variables with an association
6746 * with this uniform block.
6748 enum glsl_interface_packing packing
;
6749 if (this->layout
.flags
.q
.shared
) {
6750 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6751 } else if (this->layout
.flags
.q
.packed
) {
6752 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6753 } else if (this->layout
.flags
.q
.std430
) {
6754 packing
= GLSL_INTERFACE_PACKING_STD430
;
6756 /* The default layout is std140.
6758 packing
= GLSL_INTERFACE_PACKING_STD140
;
6761 ir_variable_mode var_mode
;
6762 const char *iface_type_name
;
6763 if (this->layout
.flags
.q
.in
) {
6764 var_mode
= ir_var_shader_in
;
6765 iface_type_name
= "in";
6766 } else if (this->layout
.flags
.q
.out
) {
6767 var_mode
= ir_var_shader_out
;
6768 iface_type_name
= "out";
6769 } else if (this->layout
.flags
.q
.uniform
) {
6770 var_mode
= ir_var_uniform
;
6771 iface_type_name
= "uniform";
6772 } else if (this->layout
.flags
.q
.buffer
) {
6773 var_mode
= ir_var_shader_storage
;
6774 iface_type_name
= "buffer";
6776 var_mode
= ir_var_auto
;
6777 iface_type_name
= "UNKNOWN";
6778 assert(!"interface block layout qualifier not found!");
6781 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6782 if (this->layout
.flags
.q
.row_major
)
6783 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6784 else if (this->layout
.flags
.q
.column_major
)
6785 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6787 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6788 exec_list declared_variables
;
6789 glsl_struct_field
*fields
;
6791 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
6792 * that we don't have incompatible qualifiers
6794 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
6795 _mesa_glsl_error(&loc
, state
,
6796 "Interface block sets both readonly and writeonly");
6799 unsigned qual_stream
;
6800 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
6802 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
6803 /* If the stream qualifier is invalid it doesn't make sense to continue
6804 * on and try to compare stream layouts on member variables against it
6805 * so just return early.
6810 unsigned expl_location
= 0;
6811 if (layout
.flags
.q
.explicit_location
) {
6812 if (!process_qualifier_constant(state
, &loc
, "location",
6813 layout
.location
, &expl_location
)) {
6816 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6820 unsigned expl_align
= 0;
6821 if (layout
.flags
.q
.explicit_align
) {
6822 if (!process_qualifier_constant(state
, &loc
, "align",
6823 layout
.align
, &expl_align
)) {
6826 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
6827 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
6834 unsigned int num_variables
=
6835 ast_process_struct_or_iface_block_members(&declared_variables
,
6837 &this->declarations
,
6841 redeclaring_per_vertex
,
6848 if (!redeclaring_per_vertex
) {
6849 validate_identifier(this->block_name
, loc
, state
);
6851 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6853 * "Block names have no other use within a shader beyond interface
6854 * matching; it is a compile-time error to use a block name at global
6855 * scope for anything other than as a block name."
6857 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6858 if (var
&& !var
->type
->is_interface()) {
6859 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6860 "already used in the scope.",
6865 const glsl_type
*earlier_per_vertex
= NULL
;
6866 if (redeclaring_per_vertex
) {
6867 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6868 * the named interface block gl_in, we can find it by looking at the
6869 * previous declaration of gl_in. Otherwise we can find it by looking
6870 * at the previous decalartion of any of the built-in outputs,
6873 * Also check that the instance name and array-ness of the redeclaration
6877 case ir_var_shader_in
:
6878 if (ir_variable
*earlier_gl_in
=
6879 state
->symbols
->get_variable("gl_in")) {
6880 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6882 _mesa_glsl_error(&loc
, state
,
6883 "redeclaration of gl_PerVertex input not allowed "
6885 _mesa_shader_stage_to_string(state
->stage
));
6887 if (this->instance_name
== NULL
||
6888 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
6889 !this->array_specifier
->is_single_dimension()) {
6890 _mesa_glsl_error(&loc
, state
,
6891 "gl_PerVertex input must be redeclared as "
6895 case ir_var_shader_out
:
6896 if (ir_variable
*earlier_gl_Position
=
6897 state
->symbols
->get_variable("gl_Position")) {
6898 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6899 } else if (ir_variable
*earlier_gl_out
=
6900 state
->symbols
->get_variable("gl_out")) {
6901 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6903 _mesa_glsl_error(&loc
, state
,
6904 "redeclaration of gl_PerVertex output not "
6905 "allowed in the %s shader",
6906 _mesa_shader_stage_to_string(state
->stage
));
6908 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6909 if (this->instance_name
== NULL
||
6910 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6911 _mesa_glsl_error(&loc
, state
,
6912 "gl_PerVertex output must be redeclared as "
6916 if (this->instance_name
!= NULL
) {
6917 _mesa_glsl_error(&loc
, state
,
6918 "gl_PerVertex output may not be redeclared with "
6919 "an instance name");
6924 _mesa_glsl_error(&loc
, state
,
6925 "gl_PerVertex must be declared as an input or an "
6930 if (earlier_per_vertex
== NULL
) {
6931 /* An error has already been reported. Bail out to avoid null
6932 * dereferences later in this function.
6937 /* Copy locations from the old gl_PerVertex interface block. */
6938 for (unsigned i
= 0; i
< num_variables
; i
++) {
6939 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6941 _mesa_glsl_error(&loc
, state
,
6942 "redeclaration of gl_PerVertex must be a subset "
6943 "of the built-in members of gl_PerVertex");
6945 fields
[i
].location
=
6946 earlier_per_vertex
->fields
.structure
[j
].location
;
6948 earlier_per_vertex
->fields
.structure
[j
].offset
;
6949 fields
[i
].interpolation
=
6950 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6951 fields
[i
].centroid
=
6952 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6954 earlier_per_vertex
->fields
.structure
[j
].sample
;
6956 earlier_per_vertex
->fields
.structure
[j
].patch
;
6957 fields
[i
].precision
=
6958 earlier_per_vertex
->fields
.structure
[j
].precision
;
6962 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6965 * If a built-in interface block is redeclared, it must appear in
6966 * the shader before any use of any member included in the built-in
6967 * declaration, or a compilation error will result.
6969 * This appears to be a clarification to the behaviour established for
6970 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6971 * regardless of GLSL version.
6973 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6974 v
.run(instructions
);
6975 if (v
.usage_found()) {
6976 _mesa_glsl_error(&loc
, state
,
6977 "redeclaration of a built-in interface block must "
6978 "appear before any use of any member of the "
6983 const glsl_type
*block_type
=
6984 glsl_type::get_interface_instance(fields
,
6989 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6990 YYLTYPE loc
= this->get_location();
6991 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6992 "already taken in the current scope",
6993 this->block_name
, iface_type_name
);
6996 /* Since interface blocks cannot contain statements, it should be
6997 * impossible for the block to generate any instructions.
6999 assert(declared_variables
.is_empty());
7001 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7003 * Geometry shader input variables get the per-vertex values written
7004 * out by vertex shader output variables of the same names. Since a
7005 * geometry shader operates on a set of vertices, each input varying
7006 * variable (or input block, see interface blocks below) needs to be
7007 * declared as an array.
7009 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7010 var_mode
== ir_var_shader_in
) {
7011 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7012 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7013 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7014 this->array_specifier
== NULL
&&
7015 var_mode
== ir_var_shader_in
) {
7016 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7017 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7018 this->array_specifier
== NULL
&&
7019 var_mode
== ir_var_shader_out
) {
7020 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7024 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7027 * "If an instance name (instance-name) is used, then it puts all the
7028 * members inside a scope within its own name space, accessed with the
7029 * field selector ( . ) operator (analogously to structures)."
7031 if (this->instance_name
) {
7032 if (redeclaring_per_vertex
) {
7033 /* When a built-in in an unnamed interface block is redeclared,
7034 * get_variable_being_redeclared() calls
7035 * check_builtin_array_max_size() to make sure that built-in array
7036 * variables aren't redeclared to illegal sizes. But we're looking
7037 * at a redeclaration of a named built-in interface block. So we
7038 * have to manually call check_builtin_array_max_size() for all parts
7039 * of the interface that are arrays.
7041 for (unsigned i
= 0; i
< num_variables
; i
++) {
7042 if (fields
[i
].type
->is_array()) {
7043 const unsigned size
= fields
[i
].type
->array_size();
7044 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7048 validate_identifier(this->instance_name
, loc
, state
);
7053 if (this->array_specifier
!= NULL
) {
7054 const glsl_type
*block_array_type
=
7055 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7057 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7059 * For uniform blocks declared an array, each individual array
7060 * element corresponds to a separate buffer object backing one
7061 * instance of the block. As the array size indicates the number
7062 * of buffer objects needed, uniform block array declarations
7063 * must specify an array size.
7065 * And a few paragraphs later:
7067 * Geometry shader input blocks must be declared as arrays and
7068 * follow the array declaration and linking rules for all
7069 * geometry shader inputs. All other input and output block
7070 * arrays must specify an array size.
7072 * The same applies to tessellation shaders.
7074 * The upshot of this is that the only circumstance where an
7075 * interface array size *doesn't* need to be specified is on a
7076 * geometry shader input, tessellation control shader input,
7077 * tessellation control shader output, and tessellation evaluation
7080 if (block_array_type
->is_unsized_array()) {
7081 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7082 state
->stage
== MESA_SHADER_TESS_CTRL
||
7083 state
->stage
== MESA_SHADER_TESS_EVAL
;
7084 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7086 if (this->layout
.flags
.q
.in
) {
7088 _mesa_glsl_error(&loc
, state
,
7089 "unsized input block arrays not allowed in "
7091 _mesa_shader_stage_to_string(state
->stage
));
7092 } else if (this->layout
.flags
.q
.out
) {
7094 _mesa_glsl_error(&loc
, state
,
7095 "unsized output block arrays not allowed in "
7097 _mesa_shader_stage_to_string(state
->stage
));
7099 /* by elimination, this is a uniform block array */
7100 _mesa_glsl_error(&loc
, state
,
7101 "unsized uniform block arrays not allowed in "
7103 _mesa_shader_stage_to_string(state
->stage
));
7107 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7109 * * Arrays of arrays of blocks are not allowed
7111 if (state
->es_shader
&& block_array_type
->is_array() &&
7112 block_array_type
->fields
.array
->is_array()) {
7113 _mesa_glsl_error(&loc
, state
,
7114 "arrays of arrays interface blocks are "
7118 var
= new(state
) ir_variable(block_array_type
,
7119 this->instance_name
,
7122 var
= new(state
) ir_variable(block_type
,
7123 this->instance_name
,
7127 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7128 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7130 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7131 var
->data
.read_only
= true;
7133 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7134 handle_geometry_shader_input_decl(state
, loc
, var
);
7135 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7136 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7137 handle_tess_shader_input_decl(state
, loc
, var
);
7138 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7139 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7141 for (unsigned i
= 0; i
< num_variables
; i
++) {
7142 if (fields
[i
].type
->is_unsized_array()) {
7143 if (var_mode
== ir_var_shader_storage
) {
7144 if (i
!= (num_variables
- 1)) {
7145 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7146 "only last member of a shader storage block "
7147 "can be defined as unsized array",
7151 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7153 * "If an array is declared as the last member of a shader storage
7154 * block and the size is not specified at compile-time, it is
7155 * sized at run-time. In all other cases, arrays are sized only
7158 if (state
->es_shader
) {
7159 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7160 "only last member of a shader storage block "
7161 "can be defined as unsized array",
7168 if (ir_variable
*earlier
=
7169 state
->symbols
->get_variable(this->instance_name
)) {
7170 if (!redeclaring_per_vertex
) {
7171 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7172 this->instance_name
);
7174 earlier
->data
.how_declared
= ir_var_declared_normally
;
7175 earlier
->type
= var
->type
;
7176 earlier
->reinit_interface_type(block_type
);
7179 if (this->layout
.flags
.q
.explicit_binding
) {
7180 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7184 var
->data
.stream
= qual_stream
;
7185 if (layout
.flags
.q
.explicit_location
) {
7186 var
->data
.location
= expl_location
;
7187 var
->data
.explicit_location
= true;
7190 state
->symbols
->add_variable(var
);
7191 instructions
->push_tail(var
);
7194 /* In order to have an array size, the block must also be declared with
7197 assert(this->array_specifier
== NULL
);
7199 for (unsigned i
= 0; i
< num_variables
; i
++) {
7201 new(state
) ir_variable(fields
[i
].type
,
7202 ralloc_strdup(state
, fields
[i
].name
),
7204 var
->data
.interpolation
= fields
[i
].interpolation
;
7205 var
->data
.centroid
= fields
[i
].centroid
;
7206 var
->data
.sample
= fields
[i
].sample
;
7207 var
->data
.patch
= fields
[i
].patch
;
7208 var
->data
.stream
= qual_stream
;
7209 var
->data
.location
= fields
[i
].location
;
7210 if (fields
[i
].location
!= -1)
7211 var
->data
.explicit_location
= true;
7212 var
->init_interface_type(block_type
);
7214 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7215 var
->data
.read_only
= true;
7217 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7218 if (state
->es_shader
) {
7219 var
->data
.precision
=
7220 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7224 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7225 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7226 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7228 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7231 if (var
->data
.mode
== ir_var_shader_storage
) {
7232 var
->data
.image_read_only
= fields
[i
].image_read_only
;
7233 var
->data
.image_write_only
= fields
[i
].image_write_only
;
7234 var
->data
.image_coherent
= fields
[i
].image_coherent
;
7235 var
->data
.image_volatile
= fields
[i
].image_volatile
;
7236 var
->data
.image_restrict
= fields
[i
].image_restrict
;
7239 /* Examine var name here since var may get deleted in the next call */
7240 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7242 if (redeclaring_per_vertex
) {
7243 ir_variable
*earlier
=
7244 get_variable_being_redeclared(var
, loc
, state
,
7245 true /* allow_all_redeclarations */);
7246 if (!var_is_gl_id
|| earlier
== NULL
) {
7247 _mesa_glsl_error(&loc
, state
,
7248 "redeclaration of gl_PerVertex can only "
7249 "include built-in variables");
7250 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7251 _mesa_glsl_error(&loc
, state
,
7252 "`%s' has already been redeclared",
7255 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7256 earlier
->reinit_interface_type(block_type
);
7261 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7262 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7264 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7265 * The UBO declaration itself doesn't get an ir_variable unless it
7266 * has an instance name. This is ugly.
7268 if (this->layout
.flags
.q
.explicit_binding
) {
7269 apply_explicit_binding(state
, &loc
, var
,
7270 var
->get_interface_type(), &this->layout
);
7273 if (var
->type
->is_unsized_array()) {
7274 if (var
->is_in_shader_storage_block()) {
7275 if (!is_unsized_array_last_element(var
)) {
7276 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7277 "only last member of a shader storage block "
7278 "can be defined as unsized array",
7281 var
->data
.from_ssbo_unsized_array
= true;
7283 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7285 * "If an array is declared as the last member of a shader storage
7286 * block and the size is not specified at compile-time, it is
7287 * sized at run-time. In all other cases, arrays are sized only
7290 if (state
->es_shader
) {
7291 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7292 "only last member of a shader storage block "
7293 "can be defined as unsized array",
7299 state
->symbols
->add_variable(var
);
7300 instructions
->push_tail(var
);
7303 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7304 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7306 * It is also a compilation error ... to redeclare a built-in
7307 * block and then use a member from that built-in block that was
7308 * not included in the redeclaration.
7310 * This appears to be a clarification to the behaviour established
7311 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7312 * behaviour regardless of GLSL version.
7314 * To prevent the shader from using a member that was not included in
7315 * the redeclaration, we disable any ir_variables that are still
7316 * associated with the old declaration of gl_PerVertex (since we've
7317 * already updated all of the variables contained in the new
7318 * gl_PerVertex to point to it).
7320 * As a side effect this will prevent
7321 * validate_intrastage_interface_blocks() from getting confused and
7322 * thinking there are conflicting definitions of gl_PerVertex in the
7325 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7326 ir_variable
*const var
= node
->as_variable();
7328 var
->get_interface_type() == earlier_per_vertex
&&
7329 var
->data
.mode
== var_mode
) {
7330 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7331 _mesa_glsl_error(&loc
, state
,
7332 "redeclaration of gl_PerVertex cannot "
7333 "follow a redeclaration of `%s'",
7336 state
->symbols
->disable_variable(var
->name
);
7348 ast_tcs_output_layout::hir(exec_list
*instructions
,
7349 struct _mesa_glsl_parse_state
*state
)
7351 YYLTYPE loc
= this->get_location();
7353 unsigned num_vertices
;
7354 if (!state
->out_qualifier
->vertices
->
7355 process_qualifier_constant(state
, "vertices", &num_vertices
,
7357 /* return here to stop cascading incorrect error messages */
7361 /* If any shader outputs occurred before this declaration and specified an
7362 * array size, make sure the size they specified is consistent with the
7365 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7366 _mesa_glsl_error(&loc
, state
,
7367 "this tessellation control shader output layout "
7368 "specifies %u vertices, but a previous output "
7369 "is declared with size %u",
7370 num_vertices
, state
->tcs_output_size
);
7374 state
->tcs_output_vertices_specified
= true;
7376 /* If any shader outputs occurred before this declaration and did not
7377 * specify an array size, their size is determined now.
7379 foreach_in_list (ir_instruction
, node
, instructions
) {
7380 ir_variable
*var
= node
->as_variable();
7381 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7384 /* Note: Not all tessellation control shader output are arrays. */
7385 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7388 if (var
->data
.max_array_access
>= num_vertices
) {
7389 _mesa_glsl_error(&loc
, state
,
7390 "this tessellation control shader output layout "
7391 "specifies %u vertices, but an access to element "
7392 "%u of output `%s' already exists", num_vertices
,
7393 var
->data
.max_array_access
, var
->name
);
7395 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7405 ast_gs_input_layout::hir(exec_list
*instructions
,
7406 struct _mesa_glsl_parse_state
*state
)
7408 YYLTYPE loc
= this->get_location();
7410 /* If any geometry input layout declaration preceded this one, make sure it
7411 * was consistent with this one.
7413 if (state
->gs_input_prim_type_specified
&&
7414 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7415 _mesa_glsl_error(&loc
, state
,
7416 "geometry shader input layout does not match"
7417 " previous declaration");
7421 /* If any shader inputs occurred before this declaration and specified an
7422 * array size, make sure the size they specified is consistent with the
7425 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7426 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7427 _mesa_glsl_error(&loc
, state
,
7428 "this geometry shader input layout implies %u vertices"
7429 " per primitive, but a previous input is declared"
7430 " with size %u", num_vertices
, state
->gs_input_size
);
7434 state
->gs_input_prim_type_specified
= true;
7436 /* If any shader inputs occurred before this declaration and did not
7437 * specify an array size, their size is determined now.
7439 foreach_in_list(ir_instruction
, node
, instructions
) {
7440 ir_variable
*var
= node
->as_variable();
7441 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7444 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7448 if (var
->type
->is_unsized_array()) {
7449 if (var
->data
.max_array_access
>= num_vertices
) {
7450 _mesa_glsl_error(&loc
, state
,
7451 "this geometry shader input layout implies %u"
7452 " vertices, but an access to element %u of input"
7453 " `%s' already exists", num_vertices
,
7454 var
->data
.max_array_access
, var
->name
);
7456 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7467 ast_cs_input_layout::hir(exec_list
*instructions
,
7468 struct _mesa_glsl_parse_state
*state
)
7470 YYLTYPE loc
= this->get_location();
7472 /* From the ARB_compute_shader specification:
7474 * If the local size of the shader in any dimension is greater
7475 * than the maximum size supported by the implementation for that
7476 * dimension, a compile-time error results.
7478 * It is not clear from the spec how the error should be reported if
7479 * the total size of the work group exceeds
7480 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7481 * report it at compile time as well.
7483 GLuint64 total_invocations
= 1;
7484 unsigned qual_local_size
[3];
7485 for (int i
= 0; i
< 3; i
++) {
7487 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7489 /* Infer a local_size of 1 for unspecified dimensions */
7490 if (this->local_size
[i
] == NULL
) {
7491 qual_local_size
[i
] = 1;
7492 } else if (!this->local_size
[i
]->
7493 process_qualifier_constant(state
, local_size_str
,
7494 &qual_local_size
[i
], false)) {
7495 ralloc_free(local_size_str
);
7498 ralloc_free(local_size_str
);
7500 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7501 _mesa_glsl_error(&loc
, state
,
7502 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7504 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7507 total_invocations
*= qual_local_size
[i
];
7508 if (total_invocations
>
7509 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7510 _mesa_glsl_error(&loc
, state
,
7511 "product of local_sizes exceeds "
7512 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7513 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7518 /* If any compute input layout declaration preceded this one, make sure it
7519 * was consistent with this one.
7521 if (state
->cs_input_local_size_specified
) {
7522 for (int i
= 0; i
< 3; i
++) {
7523 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7524 _mesa_glsl_error(&loc
, state
,
7525 "compute shader input layout does not match"
7526 " previous declaration");
7532 state
->cs_input_local_size_specified
= true;
7533 for (int i
= 0; i
< 3; i
++)
7534 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7536 /* We may now declare the built-in constant gl_WorkGroupSize (see
7537 * builtin_variable_generator::generate_constants() for why we didn't
7538 * declare it earlier).
7540 ir_variable
*var
= new(state
->symbols
)
7541 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7542 var
->data
.how_declared
= ir_var_declared_implicitly
;
7543 var
->data
.read_only
= true;
7544 instructions
->push_tail(var
);
7545 state
->symbols
->add_variable(var
);
7546 ir_constant_data data
;
7547 memset(&data
, 0, sizeof(data
));
7548 for (int i
= 0; i
< 3; i
++)
7549 data
.u
[i
] = qual_local_size
[i
];
7550 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7551 var
->constant_initializer
=
7552 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7553 var
->data
.has_initializer
= true;
7560 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7561 exec_list
*instructions
)
7563 bool gl_FragColor_assigned
= false;
7564 bool gl_FragData_assigned
= false;
7565 bool gl_FragSecondaryColor_assigned
= false;
7566 bool gl_FragSecondaryData_assigned
= false;
7567 bool user_defined_fs_output_assigned
= false;
7568 ir_variable
*user_defined_fs_output
= NULL
;
7570 /* It would be nice to have proper location information. */
7572 memset(&loc
, 0, sizeof(loc
));
7574 foreach_in_list(ir_instruction
, node
, instructions
) {
7575 ir_variable
*var
= node
->as_variable();
7577 if (!var
|| !var
->data
.assigned
)
7580 if (strcmp(var
->name
, "gl_FragColor") == 0)
7581 gl_FragColor_assigned
= true;
7582 else if (strcmp(var
->name
, "gl_FragData") == 0)
7583 gl_FragData_assigned
= true;
7584 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7585 gl_FragSecondaryColor_assigned
= true;
7586 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7587 gl_FragSecondaryData_assigned
= true;
7588 else if (!is_gl_identifier(var
->name
)) {
7589 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7590 var
->data
.mode
== ir_var_shader_out
) {
7591 user_defined_fs_output_assigned
= true;
7592 user_defined_fs_output
= var
;
7597 /* From the GLSL 1.30 spec:
7599 * "If a shader statically assigns a value to gl_FragColor, it
7600 * may not assign a value to any element of gl_FragData. If a
7601 * shader statically writes a value to any element of
7602 * gl_FragData, it may not assign a value to
7603 * gl_FragColor. That is, a shader may assign values to either
7604 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7605 * linked together must also consistently write just one of
7606 * these variables. Similarly, if user declared output
7607 * variables are in use (statically assigned to), then the
7608 * built-in variables gl_FragColor and gl_FragData may not be
7609 * assigned to. These incorrect usages all generate compile
7612 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7613 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7614 "`gl_FragColor' and `gl_FragData'");
7615 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7616 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7617 "`gl_FragColor' and `%s'",
7618 user_defined_fs_output
->name
);
7619 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7620 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7621 "`gl_FragSecondaryColorEXT' and"
7622 " `gl_FragSecondaryDataEXT'");
7623 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7624 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7625 "`gl_FragColor' and"
7626 " `gl_FragSecondaryDataEXT'");
7627 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7628 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7630 " `gl_FragSecondaryColorEXT'");
7631 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7632 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7633 "`gl_FragData' and `%s'",
7634 user_defined_fs_output
->name
);
7637 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7638 !state
->EXT_blend_func_extended_enable
) {
7639 _mesa_glsl_error(&loc
, state
,
7640 "Dual source blending requires EXT_blend_func_extended");
7646 remove_per_vertex_blocks(exec_list
*instructions
,
7647 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7649 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7650 * if it exists in this shader type.
7652 const glsl_type
*per_vertex
= NULL
;
7654 case ir_var_shader_in
:
7655 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7656 per_vertex
= gl_in
->get_interface_type();
7658 case ir_var_shader_out
:
7659 if (ir_variable
*gl_Position
=
7660 state
->symbols
->get_variable("gl_Position")) {
7661 per_vertex
= gl_Position
->get_interface_type();
7665 assert(!"Unexpected mode");
7669 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7670 * need to do anything.
7672 if (per_vertex
== NULL
)
7675 /* If the interface block is used by the shader, then we don't need to do
7678 interface_block_usage_visitor
v(mode
, per_vertex
);
7679 v
.run(instructions
);
7680 if (v
.usage_found())
7683 /* Remove any ir_variable declarations that refer to the interface block
7686 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7687 ir_variable
*const var
= node
->as_variable();
7688 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
7689 var
->data
.mode
== mode
) {
7690 state
->symbols
->disable_variable(var
->name
);