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();
2128 if (size
== NULL
|| array_size
->has_sequence_subexpression()) {
2129 _mesa_glsl_error(& loc
, state
, "array size must be a "
2130 "constant valued expression");
2134 if (size
->value
.i
[0] <= 0) {
2135 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2139 assert(size
->type
== ir
->type
);
2141 /* If the array size is const (and we've verified that
2142 * it is) then no instructions should have been emitted
2143 * when we converted it to HIR. If they were emitted,
2144 * then either the array size isn't const after all, or
2145 * we are emitting unnecessary instructions.
2147 assert(dummy_instructions
.is_empty());
2149 return size
->value
.u
[0];
2152 static const glsl_type
*
2153 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2154 ast_array_specifier
*array_specifier
,
2155 struct _mesa_glsl_parse_state
*state
)
2157 const glsl_type
*array_type
= base
;
2159 if (array_specifier
!= NULL
) {
2160 if (base
->is_array()) {
2162 /* From page 19 (page 25) of the GLSL 1.20 spec:
2164 * "Only one-dimensional arrays may be declared."
2166 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2167 return glsl_type::error_type
;
2171 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2172 !node
->is_head_sentinel(); node
= node
->prev
) {
2173 unsigned array_size
= process_array_size(node
, state
);
2174 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2182 precision_qualifier_allowed(const glsl_type
*type
)
2184 /* Precision qualifiers apply to floating point, integer and opaque
2187 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2188 * "Any floating point or any integer declaration can have the type
2189 * preceded by one of these precision qualifiers [...] Literal
2190 * constants do not have precision qualifiers. Neither do Boolean
2193 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2196 * "Precision qualifiers are added for code portability with OpenGL
2197 * ES, not for functionality. They have the same syntax as in OpenGL
2200 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2202 * "uniform lowp sampler2D sampler;
2205 * lowp vec4 col = texture2D (sampler, coord);
2206 * // texture2D returns lowp"
2208 * From this, we infer that GLSL 1.30 (and later) should allow precision
2209 * qualifiers on sampler types just like float and integer types.
2211 return (type
->is_float()
2212 || type
->is_integer()
2213 || type
->contains_opaque())
2214 && !type
->without_array()->is_record();
2218 ast_type_specifier::glsl_type(const char **name
,
2219 struct _mesa_glsl_parse_state
*state
) const
2221 const struct glsl_type
*type
;
2223 type
= state
->symbols
->get_type(this->type_name
);
2224 *name
= this->type_name
;
2226 YYLTYPE loc
= this->get_location();
2227 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2233 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2235 * "The precision statement
2237 * precision precision-qualifier type;
2239 * can be used to establish a default precision qualifier. The type field can
2240 * be either int or float or any of the sampler types, (...) If type is float,
2241 * the directive applies to non-precision-qualified floating point type
2242 * (scalar, vector, and matrix) declarations. If type is int, the directive
2243 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2244 * and unsigned) declarations."
2246 * We use the symbol table to keep the values of the default precisions for
2247 * each 'type' in each scope and we use the 'type' string from the precision
2248 * statement as key in the symbol table. When we want to retrieve the default
2249 * precision associated with a given glsl_type we need to know the type string
2250 * associated with it. This is what this function returns.
2253 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2255 switch (type
->base_type
) {
2256 case GLSL_TYPE_FLOAT
:
2258 case GLSL_TYPE_UINT
:
2261 case GLSL_TYPE_ATOMIC_UINT
:
2262 return "atomic_uint";
2263 case GLSL_TYPE_IMAGE
:
2265 case GLSL_TYPE_SAMPLER
: {
2266 const unsigned type_idx
=
2267 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2268 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2269 assert(type_idx
< 4);
2270 switch (type
->sampled_type
) {
2271 case GLSL_TYPE_FLOAT
:
2272 switch (type
->sampler_dimensionality
) {
2273 case GLSL_SAMPLER_DIM_1D
: {
2274 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2275 static const char *const names
[4] = {
2276 "sampler1D", "sampler1DArray",
2277 "sampler1DShadow", "sampler1DArrayShadow"
2279 return names
[type_idx
];
2281 case GLSL_SAMPLER_DIM_2D
: {
2282 static const char *const names
[8] = {
2283 "sampler2D", "sampler2DArray",
2284 "sampler2DShadow", "sampler2DArrayShadow",
2285 "image2D", "image2DArray", NULL
, NULL
2287 return names
[offset
+ type_idx
];
2289 case GLSL_SAMPLER_DIM_3D
: {
2290 static const char *const names
[8] = {
2291 "sampler3D", NULL
, NULL
, NULL
,
2292 "image3D", NULL
, NULL
, NULL
2294 return names
[offset
+ type_idx
];
2296 case GLSL_SAMPLER_DIM_CUBE
: {
2297 static const char *const names
[8] = {
2298 "samplerCube", "samplerCubeArray",
2299 "samplerCubeShadow", "samplerCubeArrayShadow",
2300 "imageCube", NULL
, NULL
, NULL
2302 return names
[offset
+ type_idx
];
2304 case GLSL_SAMPLER_DIM_MS
: {
2305 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2306 static const char *const names
[4] = {
2307 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2309 return names
[type_idx
];
2311 case GLSL_SAMPLER_DIM_RECT
: {
2312 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2313 static const char *const names
[4] = {
2314 "samplerRect", NULL
, "samplerRectShadow", NULL
2316 return names
[type_idx
];
2318 case GLSL_SAMPLER_DIM_BUF
: {
2319 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2320 static const char *const names
[4] = {
2321 "samplerBuffer", NULL
, NULL
, NULL
2323 return names
[type_idx
];
2325 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2326 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2327 static const char *const names
[4] = {
2328 "samplerExternalOES", NULL
, NULL
, NULL
2330 return names
[type_idx
];
2333 unreachable("Unsupported sampler/image dimensionality");
2334 } /* sampler/image float dimensionality */
2337 switch (type
->sampler_dimensionality
) {
2338 case GLSL_SAMPLER_DIM_1D
: {
2339 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2340 static const char *const names
[4] = {
2341 "isampler1D", "isampler1DArray", NULL
, NULL
2343 return names
[type_idx
];
2345 case GLSL_SAMPLER_DIM_2D
: {
2346 static const char *const names
[8] = {
2347 "isampler2D", "isampler2DArray", NULL
, NULL
,
2348 "iimage2D", "iimage2DArray", NULL
, NULL
2350 return names
[offset
+ type_idx
];
2352 case GLSL_SAMPLER_DIM_3D
: {
2353 static const char *const names
[8] = {
2354 "isampler3D", NULL
, NULL
, NULL
,
2355 "iimage3D", NULL
, NULL
, NULL
2357 return names
[offset
+ type_idx
];
2359 case GLSL_SAMPLER_DIM_CUBE
: {
2360 static const char *const names
[8] = {
2361 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2362 "iimageCube", NULL
, NULL
, NULL
2364 return names
[offset
+ type_idx
];
2366 case GLSL_SAMPLER_DIM_MS
: {
2367 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2368 static const char *const names
[4] = {
2369 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2371 return names
[type_idx
];
2373 case GLSL_SAMPLER_DIM_RECT
: {
2374 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2375 static const char *const names
[4] = {
2376 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2378 return names
[type_idx
];
2380 case GLSL_SAMPLER_DIM_BUF
: {
2381 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2382 static const char *const names
[4] = {
2383 "isamplerBuffer", NULL
, NULL
, NULL
2385 return names
[type_idx
];
2388 unreachable("Unsupported isampler/iimage dimensionality");
2389 } /* sampler/image int dimensionality */
2391 case GLSL_TYPE_UINT
:
2392 switch (type
->sampler_dimensionality
) {
2393 case GLSL_SAMPLER_DIM_1D
: {
2394 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2395 static const char *const names
[4] = {
2396 "usampler1D", "usampler1DArray", NULL
, NULL
2398 return names
[type_idx
];
2400 case GLSL_SAMPLER_DIM_2D
: {
2401 static const char *const names
[8] = {
2402 "usampler2D", "usampler2DArray", NULL
, NULL
,
2403 "uimage2D", "uimage2DArray", NULL
, NULL
2405 return names
[offset
+ type_idx
];
2407 case GLSL_SAMPLER_DIM_3D
: {
2408 static const char *const names
[8] = {
2409 "usampler3D", NULL
, NULL
, NULL
,
2410 "uimage3D", NULL
, NULL
, NULL
2412 return names
[offset
+ type_idx
];
2414 case GLSL_SAMPLER_DIM_CUBE
: {
2415 static const char *const names
[8] = {
2416 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2417 "uimageCube", NULL
, NULL
, NULL
2419 return names
[offset
+ type_idx
];
2421 case GLSL_SAMPLER_DIM_MS
: {
2422 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2423 static const char *const names
[4] = {
2424 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2426 return names
[type_idx
];
2428 case GLSL_SAMPLER_DIM_RECT
: {
2429 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2430 static const char *const names
[4] = {
2431 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2433 return names
[type_idx
];
2435 case GLSL_SAMPLER_DIM_BUF
: {
2436 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2437 static const char *const names
[4] = {
2438 "usamplerBuffer", NULL
, NULL
, NULL
2440 return names
[type_idx
];
2443 unreachable("Unsupported usampler/uimage dimensionality");
2444 } /* sampler/image uint dimensionality */
2447 unreachable("Unsupported sampler/image type");
2448 } /* sampler/image type */
2450 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2453 unreachable("Unsupported type");
2458 select_gles_precision(unsigned qual_precision
,
2459 const glsl_type
*type
,
2460 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2462 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2463 * In GLES we take the precision from the type qualifier if present,
2464 * otherwise, if the type of the variable allows precision qualifiers at
2465 * all, we look for the default precision qualifier for that type in the
2468 assert(state
->es_shader
);
2470 unsigned precision
= GLSL_PRECISION_NONE
;
2471 if (qual_precision
) {
2472 precision
= qual_precision
;
2473 } else if (precision_qualifier_allowed(type
)) {
2474 const char *type_name
=
2475 get_type_name_for_precision_qualifier(type
->without_array());
2476 assert(type_name
!= NULL
);
2479 state
->symbols
->get_default_precision_qualifier(type_name
);
2480 if (precision
== ast_precision_none
) {
2481 _mesa_glsl_error(loc
, state
,
2482 "No precision specified in this scope for type `%s'",
2490 ast_fully_specified_type::glsl_type(const char **name
,
2491 struct _mesa_glsl_parse_state
*state
) const
2493 return this->specifier
->glsl_type(name
, state
);
2497 * Determine whether a toplevel variable declaration declares a varying. This
2498 * function operates by examining the variable's mode and the shader target,
2499 * so it correctly identifies linkage variables regardless of whether they are
2500 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2502 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2503 * this function will produce undefined results.
2506 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2509 case MESA_SHADER_VERTEX
:
2510 return var
->data
.mode
== ir_var_shader_out
;
2511 case MESA_SHADER_FRAGMENT
:
2512 return var
->data
.mode
== ir_var_shader_in
;
2514 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2520 * Matrix layout qualifiers are only allowed on certain types
2523 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2525 const glsl_type
*type
,
2528 if (var
&& !var
->is_in_buffer_block()) {
2529 /* Layout qualifiers may only apply to interface blocks and fields in
2532 _mesa_glsl_error(loc
, state
,
2533 "uniform block layout qualifiers row_major and "
2534 "column_major may not be applied to variables "
2535 "outside of uniform blocks");
2536 } else if (!type
->without_array()->is_matrix()) {
2537 /* The OpenGL ES 3.0 conformance tests did not originally allow
2538 * matrix layout qualifiers on non-matrices. However, the OpenGL
2539 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2540 * amended to specifically allow these layouts on all types. Emit
2541 * a warning so that people know their code may not be portable.
2543 _mesa_glsl_warning(loc
, state
,
2544 "uniform block layout qualifiers row_major and "
2545 "column_major applied to non-matrix types may "
2546 "be rejected by older compilers");
2551 process_qualifier_constant(struct _mesa_glsl_parse_state
*state
,
2553 const char *qual_indentifier
,
2554 ast_expression
*const_expression
,
2557 exec_list dummy_instructions
;
2559 if (const_expression
== NULL
) {
2564 ir_rvalue
*const ir
= const_expression
->hir(&dummy_instructions
, state
);
2566 ir_constant
*const const_int
= ir
->constant_expression_value();
2567 if (const_int
== NULL
|| !const_int
->type
->is_integer()) {
2568 _mesa_glsl_error(loc
, state
, "%s must be an integral constant "
2569 "expression", qual_indentifier
);
2573 if (const_int
->value
.i
[0] < 0) {
2574 _mesa_glsl_error(loc
, state
, "%s layout qualifier is invalid (%d < 0)",
2575 qual_indentifier
, const_int
->value
.u
[0]);
2579 /* If the location is const (and we've verified that
2580 * it is) then no instructions should have been emitted
2581 * when we converted it to HIR. If they were emitted,
2582 * then either the location isn't const after all, or
2583 * we are emitting unnecessary instructions.
2585 assert(dummy_instructions
.is_empty());
2587 *value
= const_int
->value
.u
[0];
2592 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2595 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2596 _mesa_glsl_error(loc
, state
,
2597 "invalid stream specified %d is larger than "
2598 "MAX_VERTEX_STREAMS - 1 (%d).",
2599 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2607 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2610 const glsl_type
*type
,
2611 const ast_type_qualifier
*qual
)
2613 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2614 _mesa_glsl_error(loc
, state
,
2615 "the \"binding\" qualifier only applies to uniforms and "
2616 "shader storage buffer objects");
2620 unsigned qual_binding
;
2621 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2626 const struct gl_context
*const ctx
= state
->ctx
;
2627 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2628 unsigned max_index
= qual_binding
+ elements
- 1;
2629 const glsl_type
*base_type
= type
->without_array();
2631 if (base_type
->is_interface()) {
2632 /* UBOs. From page 60 of the GLSL 4.20 specification:
2633 * "If the binding point for any uniform block instance is less than zero,
2634 * or greater than or equal to the implementation-dependent maximum
2635 * number of uniform buffer bindings, a compilation error will occur.
2636 * When the binding identifier is used with a uniform block instanced as
2637 * an array of size N, all elements of the array from binding through
2638 * binding + N – 1 must be within this range."
2640 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2642 if (qual
->flags
.q
.uniform
&&
2643 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2644 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2645 "the maximum number of UBO binding points (%d)",
2646 qual_binding
, elements
,
2647 ctx
->Const
.MaxUniformBufferBindings
);
2651 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2652 * "If the binding point for any uniform or shader storage block instance
2653 * is less than zero, or greater than or equal to the
2654 * implementation-dependent maximum number of uniform buffer bindings, a
2655 * compile-time error will occur. When the binding identifier is used
2656 * with a uniform or shader storage block instanced as an array of size
2657 * N, all elements of the array from binding through binding + N – 1 must
2658 * be within this range."
2660 if (qual
->flags
.q
.buffer
&&
2661 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2662 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2663 "the maximum number of SSBO binding points (%d)",
2664 qual_binding
, elements
,
2665 ctx
->Const
.MaxShaderStorageBufferBindings
);
2668 } else if (base_type
->is_sampler()) {
2669 /* Samplers. From page 63 of the GLSL 4.20 specification:
2670 * "If the binding is less than zero, or greater than or equal to the
2671 * implementation-dependent maximum supported number of units, a
2672 * compilation error will occur. When the binding identifier is used
2673 * with an array of size N, all elements of the array from binding
2674 * through binding + N - 1 must be within this range."
2676 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2678 if (max_index
>= limit
) {
2679 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2680 "exceeds the maximum number of texture image units "
2681 "(%u)", qual_binding
, elements
, limit
);
2685 } else if (base_type
->contains_atomic()) {
2686 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2687 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2688 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2689 " maximum number of atomic counter buffer bindings"
2690 "(%u)", qual_binding
,
2691 ctx
->Const
.MaxAtomicBufferBindings
);
2695 } else if ((state
->is_version(420, 310) ||
2696 state
->ARB_shading_language_420pack_enable
) &&
2697 base_type
->is_image()) {
2698 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2699 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2700 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2701 " maximum number of image units (%d)", max_index
,
2702 ctx
->Const
.MaxImageUnits
);
2707 _mesa_glsl_error(loc
, state
,
2708 "the \"binding\" qualifier only applies to uniform "
2709 "blocks, opaque variables, or arrays thereof");
2713 var
->data
.explicit_binding
= true;
2714 var
->data
.binding
= qual_binding
;
2720 static glsl_interp_qualifier
2721 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2722 ir_variable_mode mode
,
2723 struct _mesa_glsl_parse_state
*state
,
2726 glsl_interp_qualifier interpolation
;
2727 if (qual
->flags
.q
.flat
)
2728 interpolation
= INTERP_QUALIFIER_FLAT
;
2729 else if (qual
->flags
.q
.noperspective
)
2730 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2731 else if (qual
->flags
.q
.smooth
)
2732 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2734 interpolation
= INTERP_QUALIFIER_NONE
;
2736 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2737 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2738 _mesa_glsl_error(loc
, state
,
2739 "interpolation qualifier `%s' can only be applied to "
2740 "shader inputs or outputs.",
2741 interpolation_string(interpolation
));
2745 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2746 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2747 _mesa_glsl_error(loc
, state
,
2748 "interpolation qualifier `%s' cannot be applied to "
2749 "vertex shader inputs or fragment shader outputs",
2750 interpolation_string(interpolation
));
2752 } else if (state
->es_shader
&&
2753 ((mode
== ir_var_shader_in
&&
2754 state
->stage
!= MESA_SHADER_VERTEX
) ||
2755 (mode
== ir_var_shader_out
&&
2756 state
->stage
!= MESA_SHADER_FRAGMENT
))) {
2757 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
2759 * "When no interpolation qualifier is present, smooth interpolation
2762 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2765 return interpolation
;
2770 apply_explicit_location(const struct ast_type_qualifier
*qual
,
2772 struct _mesa_glsl_parse_state
*state
,
2777 unsigned qual_location
;
2778 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
2783 /* Checks for GL_ARB_explicit_uniform_location. */
2784 if (qual
->flags
.q
.uniform
) {
2785 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2788 const struct gl_context
*const ctx
= state
->ctx
;
2789 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
2791 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2792 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2793 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2794 ctx
->Const
.MaxUserAssignableUniformLocations
);
2798 var
->data
.explicit_location
= true;
2799 var
->data
.location
= qual_location
;
2803 /* Between GL_ARB_explicit_attrib_location an
2804 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2805 * stage can be assigned explicit locations. The checking here associates
2806 * the correct extension with the correct stage's input / output:
2810 * vertex explicit_loc sso
2811 * tess control sso sso
2814 * fragment sso explicit_loc
2816 switch (state
->stage
) {
2817 case MESA_SHADER_VERTEX
:
2818 if (var
->data
.mode
== ir_var_shader_in
) {
2819 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2825 if (var
->data
.mode
== ir_var_shader_out
) {
2826 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2835 case MESA_SHADER_TESS_CTRL
:
2836 case MESA_SHADER_TESS_EVAL
:
2837 case MESA_SHADER_GEOMETRY
:
2838 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2839 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2848 case MESA_SHADER_FRAGMENT
:
2849 if (var
->data
.mode
== ir_var_shader_in
) {
2850 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2856 if (var
->data
.mode
== ir_var_shader_out
) {
2857 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2866 case MESA_SHADER_COMPUTE
:
2867 _mesa_glsl_error(loc
, state
,
2868 "compute shader variables cannot be given "
2869 "explicit locations");
2874 _mesa_glsl_error(loc
, state
,
2875 "%s cannot be given an explicit location in %s shader",
2877 _mesa_shader_stage_to_string(state
->stage
));
2879 var
->data
.explicit_location
= true;
2881 switch (state
->stage
) {
2882 case MESA_SHADER_VERTEX
:
2883 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2884 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
2885 : (qual_location
+ VARYING_SLOT_VAR0
);
2888 case MESA_SHADER_TESS_CTRL
:
2889 case MESA_SHADER_TESS_EVAL
:
2890 case MESA_SHADER_GEOMETRY
:
2891 if (var
->data
.patch
)
2892 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
2894 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
2897 case MESA_SHADER_FRAGMENT
:
2898 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2899 ? (qual_location
+ FRAG_RESULT_DATA0
)
2900 : (qual_location
+ VARYING_SLOT_VAR0
);
2902 case MESA_SHADER_COMPUTE
:
2903 assert(!"Unexpected shader type");
2907 /* Check if index was set for the uniform instead of the function */
2908 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
2909 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
2910 "used with subroutine functions");
2914 unsigned qual_index
;
2915 if (qual
->flags
.q
.explicit_index
&&
2916 process_qualifier_constant(state
, loc
, "index", qual
->index
,
2918 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2919 * Layout Qualifiers):
2921 * "It is also a compile-time error if a fragment shader
2922 * sets a layout index to less than 0 or greater than 1."
2924 * Older specifications don't mandate a behavior; we take
2925 * this as a clarification and always generate the error.
2927 if (qual_index
> 1) {
2928 _mesa_glsl_error(loc
, state
,
2929 "explicit index may only be 0 or 1");
2931 var
->data
.explicit_index
= true;
2932 var
->data
.index
= qual_index
;
2939 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2941 struct _mesa_glsl_parse_state
*state
,
2944 const glsl_type
*base_type
= var
->type
->without_array();
2946 if (base_type
->is_image()) {
2947 if (var
->data
.mode
!= ir_var_uniform
&&
2948 var
->data
.mode
!= ir_var_function_in
) {
2949 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2950 "function parameters or uniform-qualified "
2951 "global variables");
2954 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2955 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2956 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2957 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2958 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2959 var
->data
.read_only
= true;
2961 if (qual
->flags
.q
.explicit_image_format
) {
2962 if (var
->data
.mode
== ir_var_function_in
) {
2963 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2964 "used on image function parameters");
2967 if (qual
->image_base_type
!= base_type
->sampled_type
) {
2968 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2969 "base data type of the image");
2972 var
->data
.image_format
= qual
->image_format
;
2974 if (var
->data
.mode
== ir_var_uniform
) {
2975 if (state
->es_shader
) {
2976 _mesa_glsl_error(loc
, state
, "all image uniforms "
2977 "must have a format layout qualifier");
2979 } else if (!qual
->flags
.q
.write_only
) {
2980 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2981 "`writeonly' must have a format layout "
2986 var
->data
.image_format
= GL_NONE
;
2989 /* From page 70 of the GLSL ES 3.1 specification:
2991 * "Except for image variables qualified with the format qualifiers
2992 * r32f, r32i, and r32ui, image variables must specify either memory
2993 * qualifier readonly or the memory qualifier writeonly."
2995 if (state
->es_shader
&&
2996 var
->data
.image_format
!= GL_R32F
&&
2997 var
->data
.image_format
!= GL_R32I
&&
2998 var
->data
.image_format
!= GL_R32UI
&&
2999 !var
->data
.image_read_only
&&
3000 !var
->data
.image_write_only
) {
3001 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3002 "r32f, r32i or r32ui must be qualified `readonly' or "
3006 } else if (qual
->flags
.q
.read_only
||
3007 qual
->flags
.q
.write_only
||
3008 qual
->flags
.q
.coherent
||
3009 qual
->flags
.q
._volatile
||
3010 qual
->flags
.q
.restrict_flag
||
3011 qual
->flags
.q
.explicit_image_format
) {
3012 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3017 static inline const char*
3018 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3020 if (origin_upper_left
&& pixel_center_integer
)
3021 return "origin_upper_left, pixel_center_integer";
3022 else if (origin_upper_left
)
3023 return "origin_upper_left";
3024 else if (pixel_center_integer
)
3025 return "pixel_center_integer";
3031 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3032 const struct ast_type_qualifier
*qual
)
3034 /* If gl_FragCoord was previously declared, and the qualifiers were
3035 * different in any way, return true.
3037 if (state
->fs_redeclares_gl_fragcoord
) {
3038 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3039 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3046 validate_array_dimensions(const glsl_type
*t
,
3047 struct _mesa_glsl_parse_state
*state
,
3049 if (t
->is_array()) {
3050 t
= t
->fields
.array
;
3051 while (t
->is_array()) {
3052 if (t
->is_unsized_array()) {
3053 _mesa_glsl_error(loc
, state
,
3054 "only the outermost array dimension can "
3059 t
= t
->fields
.array
;
3065 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3067 struct _mesa_glsl_parse_state
*state
,
3070 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3072 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3074 * "Within any shader, the first redeclarations of gl_FragCoord
3075 * must appear before any use of gl_FragCoord."
3077 * Generate a compiler error if above condition is not met by the
3080 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3081 if (earlier
!= NULL
&&
3082 earlier
->data
.used
&&
3083 !state
->fs_redeclares_gl_fragcoord
) {
3084 _mesa_glsl_error(loc
, state
,
3085 "gl_FragCoord used before its first redeclaration "
3086 "in fragment shader");
3089 /* Make sure all gl_FragCoord redeclarations specify the same layout
3092 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3093 const char *const qual_string
=
3094 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3095 qual
->flags
.q
.pixel_center_integer
);
3097 const char *const state_string
=
3098 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3099 state
->fs_pixel_center_integer
);
3101 _mesa_glsl_error(loc
, state
,
3102 "gl_FragCoord redeclared with different layout "
3103 "qualifiers (%s) and (%s) ",
3107 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3108 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3109 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3110 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3111 state
->fs_redeclares_gl_fragcoord
=
3112 state
->fs_origin_upper_left
||
3113 state
->fs_pixel_center_integer
||
3114 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3117 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3118 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3119 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3120 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3121 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3122 ? "origin_upper_left" : "pixel_center_integer";
3124 _mesa_glsl_error(loc
, state
,
3125 "layout qualifier `%s' can only be applied to "
3126 "fragment shader input `gl_FragCoord'",
3130 if (qual
->flags
.q
.explicit_location
) {
3131 apply_explicit_location(qual
, var
, state
, loc
);
3132 } else if (qual
->flags
.q
.explicit_index
) {
3133 if (!qual
->flags
.q
.subroutine_def
)
3134 _mesa_glsl_error(loc
, state
,
3135 "explicit index requires explicit location");
3138 if (qual
->flags
.q
.explicit_binding
) {
3139 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3142 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3143 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3144 unsigned qual_stream
;
3145 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3147 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3148 var
->data
.stream
= qual_stream
;
3152 if (var
->type
->contains_atomic()) {
3153 if (var
->data
.mode
== ir_var_uniform
) {
3154 if (var
->data
.explicit_binding
) {
3156 &state
->atomic_counter_offsets
[var
->data
.binding
];
3158 if (*offset
% ATOMIC_COUNTER_SIZE
)
3159 _mesa_glsl_error(loc
, state
,
3160 "misaligned atomic counter offset");
3162 var
->data
.offset
= *offset
;
3163 *offset
+= var
->type
->atomic_size();
3166 _mesa_glsl_error(loc
, state
,
3167 "atomic counters require explicit binding point");
3169 } else if (var
->data
.mode
!= ir_var_function_in
) {
3170 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3171 "function parameters or uniform-qualified "
3172 "global variables");
3176 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3177 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3178 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3179 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3180 * These extensions and all following extensions that add the 'layout'
3181 * keyword have been modified to require the use of 'in' or 'out'.
3183 * The following extension do not allow the deprecated keywords:
3185 * GL_AMD_conservative_depth
3186 * GL_ARB_conservative_depth
3187 * GL_ARB_gpu_shader5
3188 * GL_ARB_separate_shader_objects
3189 * GL_ARB_tessellation_shader
3190 * GL_ARB_transform_feedback3
3191 * GL_ARB_uniform_buffer_object
3193 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3194 * allow layout with the deprecated keywords.
3196 const bool relaxed_layout_qualifier_checking
=
3197 state
->ARB_fragment_coord_conventions_enable
;
3199 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3200 || qual
->flags
.q
.varying
;
3201 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3202 if (relaxed_layout_qualifier_checking
) {
3203 _mesa_glsl_warning(loc
, state
,
3204 "`layout' qualifier may not be used with "
3205 "`attribute' or `varying'");
3207 _mesa_glsl_error(loc
, state
,
3208 "`layout' qualifier may not be used with "
3209 "`attribute' or `varying'");
3213 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3214 * AMD_conservative_depth.
3216 int depth_layout_count
= qual
->flags
.q
.depth_any
3217 + qual
->flags
.q
.depth_greater
3218 + qual
->flags
.q
.depth_less
3219 + qual
->flags
.q
.depth_unchanged
;
3220 if (depth_layout_count
> 0
3221 && !state
->AMD_conservative_depth_enable
3222 && !state
->ARB_conservative_depth_enable
) {
3223 _mesa_glsl_error(loc
, state
,
3224 "extension GL_AMD_conservative_depth or "
3225 "GL_ARB_conservative_depth must be enabled "
3226 "to use depth layout qualifiers");
3227 } else if (depth_layout_count
> 0
3228 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3229 _mesa_glsl_error(loc
, state
,
3230 "depth layout qualifiers can be applied only to "
3232 } else if (depth_layout_count
> 1
3233 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3234 _mesa_glsl_error(loc
, state
,
3235 "at most one depth layout qualifier can be applied to "
3238 if (qual
->flags
.q
.depth_any
)
3239 var
->data
.depth_layout
= ir_depth_layout_any
;
3240 else if (qual
->flags
.q
.depth_greater
)
3241 var
->data
.depth_layout
= ir_depth_layout_greater
;
3242 else if (qual
->flags
.q
.depth_less
)
3243 var
->data
.depth_layout
= ir_depth_layout_less
;
3244 else if (qual
->flags
.q
.depth_unchanged
)
3245 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3247 var
->data
.depth_layout
= ir_depth_layout_none
;
3249 if (qual
->flags
.q
.std140
||
3250 qual
->flags
.q
.std430
||
3251 qual
->flags
.q
.packed
||
3252 qual
->flags
.q
.shared
) {
3253 _mesa_glsl_error(loc
, state
,
3254 "uniform and shader storage block layout qualifiers "
3255 "std140, std430, packed, and shared can only be "
3256 "applied to uniform or shader storage blocks, not "
3260 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3261 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3264 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3267 * "Fragment shaders also allow the following layout qualifier on in only
3268 * (not with variable declarations)
3269 * layout-qualifier-id
3270 * early_fragment_tests
3273 if (qual
->flags
.q
.early_fragment_tests
) {
3274 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3275 "valid in fragment shader input layout declaration.");
3280 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3282 struct _mesa_glsl_parse_state
*state
,
3286 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3288 if (qual
->flags
.q
.invariant
) {
3289 if (var
->data
.used
) {
3290 _mesa_glsl_error(loc
, state
,
3291 "variable `%s' may not be redeclared "
3292 "`invariant' after being used",
3295 var
->data
.invariant
= 1;
3299 if (qual
->flags
.q
.precise
) {
3300 if (var
->data
.used
) {
3301 _mesa_glsl_error(loc
, state
,
3302 "variable `%s' may not be redeclared "
3303 "`precise' after being used",
3306 var
->data
.precise
= 1;
3310 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3311 _mesa_glsl_error(loc
, state
,
3312 "`subroutine' may only be applied to uniforms, "
3313 "subroutine type declarations, or function definitions");
3316 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3317 || qual
->flags
.q
.uniform
3318 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3319 var
->data
.read_only
= 1;
3321 if (qual
->flags
.q
.centroid
)
3322 var
->data
.centroid
= 1;
3324 if (qual
->flags
.q
.sample
)
3325 var
->data
.sample
= 1;
3327 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3328 if (state
->es_shader
) {
3329 var
->data
.precision
=
3330 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3333 if (qual
->flags
.q
.patch
)
3334 var
->data
.patch
= 1;
3336 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3337 var
->type
= glsl_type::error_type
;
3338 _mesa_glsl_error(loc
, state
,
3339 "`attribute' variables may not be declared in the "
3341 _mesa_shader_stage_to_string(state
->stage
));
3344 /* Disallow layout qualifiers which may only appear on layout declarations. */
3345 if (qual
->flags
.q
.prim_type
) {
3346 _mesa_glsl_error(loc
, state
,
3347 "Primitive type may only be specified on GS input or output "
3348 "layout declaration, not on variables.");
3351 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3353 * "However, the const qualifier cannot be used with out or inout."
3355 * The same section of the GLSL 4.40 spec further clarifies this saying:
3357 * "The const qualifier cannot be used with out or inout, or a
3358 * compile-time error results."
3360 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3361 _mesa_glsl_error(loc
, state
,
3362 "`const' may not be applied to `out' or `inout' "
3363 "function parameters");
3366 /* If there is no qualifier that changes the mode of the variable, leave
3367 * the setting alone.
3369 assert(var
->data
.mode
!= ir_var_temporary
);
3370 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3371 var
->data
.mode
= ir_var_function_inout
;
3372 else if (qual
->flags
.q
.in
)
3373 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3374 else if (qual
->flags
.q
.attribute
3375 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3376 var
->data
.mode
= ir_var_shader_in
;
3377 else if (qual
->flags
.q
.out
)
3378 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3379 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3380 var
->data
.mode
= ir_var_shader_out
;
3381 else if (qual
->flags
.q
.uniform
)
3382 var
->data
.mode
= ir_var_uniform
;
3383 else if (qual
->flags
.q
.buffer
)
3384 var
->data
.mode
= ir_var_shader_storage
;
3385 else if (qual
->flags
.q
.shared_storage
)
3386 var
->data
.mode
= ir_var_shader_shared
;
3388 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3389 /* User-defined ins/outs are not permitted in compute shaders. */
3390 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3391 _mesa_glsl_error(loc
, state
,
3392 "user-defined input and output variables are not "
3393 "permitted in compute shaders");
3396 /* This variable is being used to link data between shader stages (in
3397 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3398 * that is allowed for such purposes.
3400 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3402 * "The varying qualifier can be used only with the data types
3403 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3406 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3407 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3409 * "Fragment inputs can only be signed and unsigned integers and
3410 * integer vectors, float, floating-point vectors, matrices, or
3411 * arrays of these. Structures cannot be input.
3413 * Similar text exists in the section on vertex shader outputs.
3415 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3416 * 3.00 spec allows structs as well. Varying structs are also allowed
3419 switch (var
->type
->get_scalar_type()->base_type
) {
3420 case GLSL_TYPE_FLOAT
:
3421 /* Ok in all GLSL versions */
3423 case GLSL_TYPE_UINT
:
3425 if (state
->is_version(130, 300))
3427 _mesa_glsl_error(loc
, state
,
3428 "varying variables must be of base type float in %s",
3429 state
->get_version_string());
3431 case GLSL_TYPE_STRUCT
:
3432 if (state
->is_version(150, 300))
3434 _mesa_glsl_error(loc
, state
,
3435 "varying variables may not be of type struct");
3437 case GLSL_TYPE_DOUBLE
:
3440 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3445 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3446 switch (state
->stage
) {
3447 case MESA_SHADER_VERTEX
:
3448 if (var
->data
.mode
== ir_var_shader_out
)
3449 var
->data
.invariant
= true;
3451 case MESA_SHADER_TESS_CTRL
:
3452 case MESA_SHADER_TESS_EVAL
:
3453 case MESA_SHADER_GEOMETRY
:
3454 if ((var
->data
.mode
== ir_var_shader_in
)
3455 || (var
->data
.mode
== ir_var_shader_out
))
3456 var
->data
.invariant
= true;
3458 case MESA_SHADER_FRAGMENT
:
3459 if (var
->data
.mode
== ir_var_shader_in
)
3460 var
->data
.invariant
= true;
3462 case MESA_SHADER_COMPUTE
:
3463 /* Invariance isn't meaningful in compute shaders. */
3468 var
->data
.interpolation
=
3469 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
3472 /* Does the declaration use the deprecated 'attribute' or 'varying'
3475 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3476 || qual
->flags
.q
.varying
;
3479 /* Validate auxiliary storage qualifiers */
3481 /* From section 4.3.4 of the GLSL 1.30 spec:
3482 * "It is an error to use centroid in in a vertex shader."
3484 * From section 4.3.4 of the GLSL ES 3.00 spec:
3485 * "It is an error to use centroid in or interpolation qualifiers in
3486 * a vertex shader input."
3489 /* Section 4.3.6 of the GLSL 1.30 specification states:
3490 * "It is an error to use centroid out in a fragment shader."
3492 * The GL_ARB_shading_language_420pack extension specification states:
3493 * "It is an error to use auxiliary storage qualifiers or interpolation
3494 * qualifiers on an output in a fragment shader."
3496 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3497 _mesa_glsl_error(loc
, state
,
3498 "sample qualifier may only be used on `in` or `out` "
3499 "variables between shader stages");
3501 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3502 _mesa_glsl_error(loc
, state
,
3503 "centroid qualifier may only be used with `in', "
3504 "`out' or `varying' variables between shader stages");
3507 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3508 _mesa_glsl_error(loc
, state
,
3509 "the shared storage qualifiers can only be used with "
3513 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3517 * Get the variable that is being redeclared by this declaration
3519 * Semantic checks to verify the validity of the redeclaration are also
3520 * performed. If semantic checks fail, compilation error will be emitted via
3521 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3524 * A pointer to an existing variable in the current scope if the declaration
3525 * is a redeclaration, \c NULL otherwise.
3527 static ir_variable
*
3528 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3529 struct _mesa_glsl_parse_state
*state
,
3530 bool allow_all_redeclarations
)
3532 /* Check if this declaration is actually a re-declaration, either to
3533 * resize an array or add qualifiers to an existing variable.
3535 * This is allowed for variables in the current scope, or when at
3536 * global scope (for built-ins in the implicit outer scope).
3538 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3539 if (earlier
== NULL
||
3540 (state
->current_function
!= NULL
&&
3541 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3546 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3548 * "It is legal to declare an array without a size and then
3549 * later re-declare the same name as an array of the same
3550 * type and specify a size."
3552 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3553 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3554 /* FINISHME: This doesn't match the qualifiers on the two
3555 * FINISHME: declarations. It's not 100% clear whether this is
3556 * FINISHME: required or not.
3559 const unsigned size
= unsigned(var
->type
->array_size());
3560 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3561 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3562 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3564 earlier
->data
.max_array_access
);
3567 earlier
->type
= var
->type
;
3570 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3571 state
->is_version(150, 0))
3572 && strcmp(var
->name
, "gl_FragCoord") == 0
3573 && earlier
->type
== var
->type
3574 && var
->data
.mode
== ir_var_shader_in
) {
3575 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3578 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3579 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3581 /* According to section 4.3.7 of the GLSL 1.30 spec,
3582 * the following built-in varaibles can be redeclared with an
3583 * interpolation qualifier:
3586 * * gl_FrontSecondaryColor
3587 * * gl_BackSecondaryColor
3589 * * gl_SecondaryColor
3591 } else if (state
->is_version(130, 0)
3592 && (strcmp(var
->name
, "gl_FrontColor") == 0
3593 || strcmp(var
->name
, "gl_BackColor") == 0
3594 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3595 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3596 || strcmp(var
->name
, "gl_Color") == 0
3597 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3598 && earlier
->type
== var
->type
3599 && earlier
->data
.mode
== var
->data
.mode
) {
3600 earlier
->data
.interpolation
= var
->data
.interpolation
;
3602 /* Layout qualifiers for gl_FragDepth. */
3603 } else if ((state
->AMD_conservative_depth_enable
||
3604 state
->ARB_conservative_depth_enable
)
3605 && strcmp(var
->name
, "gl_FragDepth") == 0
3606 && earlier
->type
== var
->type
3607 && earlier
->data
.mode
== var
->data
.mode
) {
3609 /** From the AMD_conservative_depth spec:
3610 * Within any shader, the first redeclarations of gl_FragDepth
3611 * must appear before any use of gl_FragDepth.
3613 if (earlier
->data
.used
) {
3614 _mesa_glsl_error(&loc
, state
,
3615 "the first redeclaration of gl_FragDepth "
3616 "must appear before any use of gl_FragDepth");
3619 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3620 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3621 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3622 _mesa_glsl_error(&loc
, state
,
3623 "gl_FragDepth: depth layout is declared here "
3624 "as '%s, but it was previously declared as "
3626 depth_layout_string(var
->data
.depth_layout
),
3627 depth_layout_string(earlier
->data
.depth_layout
));
3630 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3632 } else if (allow_all_redeclarations
) {
3633 if (earlier
->data
.mode
!= var
->data
.mode
) {
3634 _mesa_glsl_error(&loc
, state
,
3635 "redeclaration of `%s' with incorrect qualifiers",
3637 } else if (earlier
->type
!= var
->type
) {
3638 _mesa_glsl_error(&loc
, state
,
3639 "redeclaration of `%s' has incorrect type",
3643 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3650 * Generate the IR for an initializer in a variable declaration
3653 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3654 ast_fully_specified_type
*type
,
3655 exec_list
*initializer_instructions
,
3656 struct _mesa_glsl_parse_state
*state
)
3658 ir_rvalue
*result
= NULL
;
3660 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3662 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3664 * "All uniform variables are read-only and are initialized either
3665 * directly by an application via API commands, or indirectly by
3668 if (var
->data
.mode
== ir_var_uniform
) {
3669 state
->check_version(120, 0, &initializer_loc
,
3670 "cannot initialize uniform %s",
3674 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3676 * "Buffer variables cannot have initializers."
3678 if (var
->data
.mode
== ir_var_shader_storage
) {
3679 _mesa_glsl_error(&initializer_loc
, state
,
3680 "cannot initialize buffer variable %s",
3684 /* From section 4.1.7 of the GLSL 4.40 spec:
3686 * "Opaque variables [...] are initialized only through the
3687 * OpenGL API; they cannot be declared with an initializer in a
3690 if (var
->type
->contains_opaque()) {
3691 _mesa_glsl_error(&initializer_loc
, state
,
3692 "cannot initialize opaque variable %s",
3696 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3697 _mesa_glsl_error(&initializer_loc
, state
,
3698 "cannot initialize %s shader input / %s %s",
3699 _mesa_shader_stage_to_string(state
->stage
),
3700 (state
->stage
== MESA_SHADER_VERTEX
)
3701 ? "attribute" : "varying",
3705 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3706 _mesa_glsl_error(&initializer_loc
, state
,
3707 "cannot initialize %s shader output %s",
3708 _mesa_shader_stage_to_string(state
->stage
),
3712 /* If the initializer is an ast_aggregate_initializer, recursively store
3713 * type information from the LHS into it, so that its hir() function can do
3716 if (decl
->initializer
->oper
== ast_aggregate
)
3717 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3719 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3720 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3722 /* Calculate the constant value if this is a const or uniform
3725 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
3727 * "Declarations of globals without a storage qualifier, or with
3728 * just the const qualifier, may include initializers, in which case
3729 * they will be initialized before the first line of main() is
3730 * executed. Such initializers must be a constant expression."
3732 * The same section of the GLSL ES 3.00.4 spec has similar language.
3734 if (type
->qualifier
.flags
.q
.constant
3735 || type
->qualifier
.flags
.q
.uniform
3736 || (state
->es_shader
&& state
->current_function
== NULL
)) {
3737 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3739 if (new_rhs
!= NULL
) {
3742 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
3745 * "A constant expression is one of
3749 * - an expression formed by an operator on operands that are
3750 * all constant expressions, including getting an element of
3751 * a constant array, or a field of a constant structure, or
3752 * components of a constant vector. However, the sequence
3753 * operator ( , ) and the assignment operators ( =, +=, ...)
3754 * are not included in the operators that can create a
3755 * constant expression."
3757 * Section 12.43 (Sequence operator and constant expressions) says:
3759 * "Should the following construct be allowed?
3763 * The expression within the brackets uses the sequence operator
3764 * (',') and returns the integer 3 so the construct is declaring
3765 * a single-dimensional array of size 3. In some languages, the
3766 * construct declares a two-dimensional array. It would be
3767 * preferable to make this construct illegal to avoid confusion.
3769 * One possibility is to change the definition of the sequence
3770 * operator so that it does not return a constant-expression and
3771 * hence cannot be used to declare an array size.
3773 * RESOLUTION: The result of a sequence operator is not a
3774 * constant-expression."
3776 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
3777 * contains language almost identical to the section 4.3.3 in the
3778 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
3781 ir_constant
*constant_value
= rhs
->constant_expression_value();
3782 if (!constant_value
||
3783 (state
->is_version(430, 300) &&
3784 decl
->initializer
->has_sequence_subexpression())) {
3785 const char *const variable_mode
=
3786 (type
->qualifier
.flags
.q
.constant
)
3788 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
3790 /* If ARB_shading_language_420pack is enabled, initializers of
3791 * const-qualified local variables do not have to be constant
3792 * expressions. Const-qualified global variables must still be
3793 * initialized with constant expressions.
3795 if (!state
->has_420pack()
3796 || state
->current_function
== NULL
) {
3797 _mesa_glsl_error(& initializer_loc
, state
,
3798 "initializer of %s variable `%s' must be a "
3799 "constant expression",
3802 if (var
->type
->is_numeric()) {
3803 /* Reduce cascading errors. */
3804 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3805 ? ir_constant::zero(state
, var
->type
) : NULL
;
3809 rhs
= constant_value
;
3810 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3811 ? constant_value
: NULL
;
3814 if (var
->type
->is_numeric()) {
3815 /* Reduce cascading errors. */
3816 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3817 ? ir_constant::zero(state
, var
->type
) : NULL
;
3822 if (rhs
&& !rhs
->type
->is_error()) {
3823 bool temp
= var
->data
.read_only
;
3824 if (type
->qualifier
.flags
.q
.constant
)
3825 var
->data
.read_only
= false;
3827 /* Never emit code to initialize a uniform.
3829 const glsl_type
*initializer_type
;
3830 if (!type
->qualifier
.flags
.q
.uniform
) {
3831 do_assignment(initializer_instructions
, state
,
3836 type
->get_location());
3837 initializer_type
= result
->type
;
3839 initializer_type
= rhs
->type
;
3841 var
->constant_initializer
= rhs
->constant_expression_value();
3842 var
->data
.has_initializer
= true;
3844 /* If the declared variable is an unsized array, it must inherrit
3845 * its full type from the initializer. A declaration such as
3847 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3851 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3853 * The assignment generated in the if-statement (below) will also
3854 * automatically handle this case for non-uniforms.
3856 * If the declared variable is not an array, the types must
3857 * already match exactly. As a result, the type assignment
3858 * here can be done unconditionally. For non-uniforms the call
3859 * to do_assignment can change the type of the initializer (via
3860 * the implicit conversion rules). For uniforms the initializer
3861 * must be a constant expression, and the type of that expression
3862 * was validated above.
3864 var
->type
= initializer_type
;
3866 var
->data
.read_only
= temp
;
3873 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3874 YYLTYPE loc
, ir_variable
*var
,
3875 unsigned num_vertices
,
3877 const char *var_category
)
3879 if (var
->type
->is_unsized_array()) {
3880 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3882 * All geometry shader input unsized array declarations will be
3883 * sized by an earlier input layout qualifier, when present, as per
3884 * the following table.
3886 * Followed by a table mapping each allowed input layout qualifier to
3887 * the corresponding input length.
3889 * Similarly for tessellation control shader outputs.
3891 if (num_vertices
!= 0)
3892 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3895 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3896 * includes the following examples of compile-time errors:
3898 * // code sequence within one shader...
3899 * in vec4 Color1[]; // size unknown
3900 * ...Color1.length()...// illegal, length() unknown
3901 * in vec4 Color2[2]; // size is 2
3902 * ...Color1.length()...// illegal, Color1 still has no size
3903 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3904 * layout(lines) in; // legal, input size is 2, matching
3905 * in vec4 Color4[3]; // illegal, contradicts layout
3908 * To detect the case illustrated by Color3, we verify that the size of
3909 * an explicitly-sized array matches the size of any previously declared
3910 * explicitly-sized array. To detect the case illustrated by Color4, we
3911 * verify that the size of an explicitly-sized array is consistent with
3912 * any previously declared input layout.
3914 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3915 _mesa_glsl_error(&loc
, state
,
3916 "%s size contradicts previously declared layout "
3917 "(size is %u, but layout requires a size of %u)",
3918 var_category
, var
->type
->length
, num_vertices
);
3919 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3920 _mesa_glsl_error(&loc
, state
,
3921 "%s sizes are inconsistent (size is %u, but a "
3922 "previous declaration has size %u)",
3923 var_category
, var
->type
->length
, *size
);
3925 *size
= var
->type
->length
;
3931 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3932 YYLTYPE loc
, ir_variable
*var
)
3934 unsigned num_vertices
= 0;
3936 if (state
->tcs_output_vertices_specified
) {
3937 if (!state
->out_qualifier
->vertices
->
3938 process_qualifier_constant(state
, "vertices",
3939 &num_vertices
, false)) {
3943 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
3944 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
3945 "GL_MAX_PATCH_VERTICES", num_vertices
);
3950 if (!var
->type
->is_array() && !var
->data
.patch
) {
3951 _mesa_glsl_error(&loc
, state
,
3952 "tessellation control shader outputs must be arrays");
3954 /* To avoid cascading failures, short circuit the checks below. */
3958 if (var
->data
.patch
)
3961 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3962 &state
->tcs_output_size
,
3963 "tessellation control shader output");
3967 * Do additional processing necessary for tessellation control/evaluation shader
3968 * input declarations. This covers both interface block arrays and bare input
3972 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3973 YYLTYPE loc
, ir_variable
*var
)
3975 if (!var
->type
->is_array() && !var
->data
.patch
) {
3976 _mesa_glsl_error(&loc
, state
,
3977 "per-vertex tessellation shader inputs must be arrays");
3978 /* Avoid cascading failures. */
3982 if (var
->data
.patch
)
3985 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3986 if (var
->type
->is_unsized_array()) {
3987 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3988 state
->Const
.MaxPatchVertices
);
3994 * Do additional processing necessary for geometry shader input declarations
3995 * (this covers both interface blocks arrays and bare input variables).
3998 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3999 YYLTYPE loc
, ir_variable
*var
)
4001 unsigned num_vertices
= 0;
4003 if (state
->gs_input_prim_type_specified
) {
4004 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4007 /* Geometry shader input variables must be arrays. Caller should have
4008 * reported an error for this.
4010 if (!var
->type
->is_array()) {
4011 assert(state
->error
);
4013 /* To avoid cascading failures, short circuit the checks below. */
4017 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4018 &state
->gs_input_size
,
4019 "geometry shader input");
4023 validate_identifier(const char *identifier
, YYLTYPE loc
,
4024 struct _mesa_glsl_parse_state
*state
)
4026 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4028 * "Identifiers starting with "gl_" are reserved for use by
4029 * OpenGL, and may not be declared in a shader as either a
4030 * variable or a function."
4032 if (is_gl_identifier(identifier
)) {
4033 _mesa_glsl_error(&loc
, state
,
4034 "identifier `%s' uses reserved `gl_' prefix",
4036 } else if (strstr(identifier
, "__")) {
4037 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4040 * "In addition, all identifiers containing two
4041 * consecutive underscores (__) are reserved as
4042 * possible future keywords."
4044 * The intention is that names containing __ are reserved for internal
4045 * use by the implementation, and names prefixed with GL_ are reserved
4046 * for use by Khronos. Names simply containing __ are dangerous to use,
4047 * but should be allowed.
4049 * A future version of the GLSL specification will clarify this.
4051 _mesa_glsl_warning(&loc
, state
,
4052 "identifier `%s' uses reserved `__' string",
4058 ast_declarator_list::hir(exec_list
*instructions
,
4059 struct _mesa_glsl_parse_state
*state
)
4062 const struct glsl_type
*decl_type
;
4063 const char *type_name
= NULL
;
4064 ir_rvalue
*result
= NULL
;
4065 YYLTYPE loc
= this->get_location();
4067 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4069 * "To ensure that a particular output variable is invariant, it is
4070 * necessary to use the invariant qualifier. It can either be used to
4071 * qualify a previously declared variable as being invariant
4073 * invariant gl_Position; // make existing gl_Position be invariant"
4075 * In these cases the parser will set the 'invariant' flag in the declarator
4076 * list, and the type will be NULL.
4078 if (this->invariant
) {
4079 assert(this->type
== NULL
);
4081 if (state
->current_function
!= NULL
) {
4082 _mesa_glsl_error(& loc
, state
,
4083 "all uses of `invariant' keyword must be at global "
4087 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4088 assert(decl
->array_specifier
== NULL
);
4089 assert(decl
->initializer
== NULL
);
4091 ir_variable
*const earlier
=
4092 state
->symbols
->get_variable(decl
->identifier
);
4093 if (earlier
== NULL
) {
4094 _mesa_glsl_error(& loc
, state
,
4095 "undeclared variable `%s' cannot be marked "
4096 "invariant", decl
->identifier
);
4097 } else if (!is_varying_var(earlier
, state
->stage
)) {
4098 _mesa_glsl_error(&loc
, state
,
4099 "`%s' cannot be marked invariant; interfaces between "
4100 "shader stages only.", decl
->identifier
);
4101 } else if (earlier
->data
.used
) {
4102 _mesa_glsl_error(& loc
, state
,
4103 "variable `%s' may not be redeclared "
4104 "`invariant' after being used",
4107 earlier
->data
.invariant
= true;
4111 /* Invariant redeclarations do not have r-values.
4116 if (this->precise
) {
4117 assert(this->type
== NULL
);
4119 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4120 assert(decl
->array_specifier
== NULL
);
4121 assert(decl
->initializer
== NULL
);
4123 ir_variable
*const earlier
=
4124 state
->symbols
->get_variable(decl
->identifier
);
4125 if (earlier
== NULL
) {
4126 _mesa_glsl_error(& loc
, state
,
4127 "undeclared variable `%s' cannot be marked "
4128 "precise", decl
->identifier
);
4129 } else if (state
->current_function
!= NULL
&&
4130 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4131 /* Note: we have to check if we're in a function, since
4132 * builtins are treated as having come from another scope.
4134 _mesa_glsl_error(& loc
, state
,
4135 "variable `%s' from an outer scope may not be "
4136 "redeclared `precise' in this scope",
4138 } else if (earlier
->data
.used
) {
4139 _mesa_glsl_error(& loc
, state
,
4140 "variable `%s' may not be redeclared "
4141 "`precise' after being used",
4144 earlier
->data
.precise
= true;
4148 /* Precise redeclarations do not have r-values either. */
4152 assert(this->type
!= NULL
);
4153 assert(!this->invariant
);
4154 assert(!this->precise
);
4156 /* The type specifier may contain a structure definition. Process that
4157 * before any of the variable declarations.
4159 (void) this->type
->specifier
->hir(instructions
, state
);
4161 decl_type
= this->type
->glsl_type(& type_name
, state
);
4163 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4164 * "Buffer variables may only be declared inside interface blocks
4165 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4166 * shader storage blocks. It is a compile-time error to declare buffer
4167 * variables at global scope (outside a block)."
4169 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4170 _mesa_glsl_error(&loc
, state
,
4171 "buffer variables cannot be declared outside "
4172 "interface blocks");
4175 /* An offset-qualified atomic counter declaration sets the default
4176 * offset for the next declaration within the same atomic counter
4179 if (decl_type
&& decl_type
->contains_atomic()) {
4180 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4181 type
->qualifier
.flags
.q
.explicit_offset
) {
4182 unsigned qual_binding
;
4183 unsigned qual_offset
;
4184 if (process_qualifier_constant(state
, &loc
, "binding",
4185 type
->qualifier
.binding
,
4187 && process_qualifier_constant(state
, &loc
, "offset",
4188 type
->qualifier
.offset
,
4190 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4195 if (this->declarations
.is_empty()) {
4196 /* If there is no structure involved in the program text, there are two
4197 * possible scenarios:
4199 * - The program text contained something like 'vec4;'. This is an
4200 * empty declaration. It is valid but weird. Emit a warning.
4202 * - The program text contained something like 'S;' and 'S' is not the
4203 * name of a known structure type. This is both invalid and weird.
4206 * - The program text contained something like 'mediump float;'
4207 * when the programmer probably meant 'precision mediump
4208 * float;' Emit a warning with a description of what they
4209 * probably meant to do.
4211 * Note that if decl_type is NULL and there is a structure involved,
4212 * there must have been some sort of error with the structure. In this
4213 * case we assume that an error was already generated on this line of
4214 * code for the structure. There is no need to generate an additional,
4217 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4220 if (decl_type
== NULL
) {
4221 _mesa_glsl_error(&loc
, state
,
4222 "invalid type `%s' in empty declaration",
4225 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4226 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4229 * "... any declaration that leaves the size undefined is
4230 * disallowed as this would add complexity and there are no
4233 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4234 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4235 "or implicitly defined");
4238 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4240 * "The combinations of types and qualifiers that cause
4241 * compile-time or link-time errors are the same whether or not
4242 * the declaration is empty."
4244 validate_array_dimensions(decl_type
, state
, &loc
);
4247 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4248 /* Empty atomic counter declarations are allowed and useful
4249 * to set the default offset qualifier.
4252 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4253 if (this->type
->specifier
->structure
!= NULL
) {
4254 _mesa_glsl_error(&loc
, state
,
4255 "precision qualifiers can't be applied "
4258 static const char *const precision_names
[] = {
4265 _mesa_glsl_warning(&loc
, state
,
4266 "empty declaration with precision "
4267 "qualifier, to set the default precision, "
4268 "use `precision %s %s;'",
4269 precision_names
[this->type
->
4270 qualifier
.precision
],
4273 } else if (this->type
->specifier
->structure
== NULL
) {
4274 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4279 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4280 const struct glsl_type
*var_type
;
4282 const char *identifier
= decl
->identifier
;
4283 /* FINISHME: Emit a warning if a variable declaration shadows a
4284 * FINISHME: declaration at a higher scope.
4287 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4288 if (type_name
!= NULL
) {
4289 _mesa_glsl_error(& loc
, state
,
4290 "invalid type `%s' in declaration of `%s'",
4291 type_name
, decl
->identifier
);
4293 _mesa_glsl_error(& loc
, state
,
4294 "invalid type in declaration of `%s'",
4300 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4304 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4306 _mesa_glsl_error(& loc
, state
,
4307 "invalid type in declaration of `%s'",
4309 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4314 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4317 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4319 /* The 'varying in' and 'varying out' qualifiers can only be used with
4320 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4323 if (this->type
->qualifier
.flags
.q
.varying
) {
4324 if (this->type
->qualifier
.flags
.q
.in
) {
4325 _mesa_glsl_error(& loc
, state
,
4326 "`varying in' qualifier in declaration of "
4327 "`%s' only valid for geometry shaders using "
4328 "ARB_geometry_shader4 or EXT_geometry_shader4",
4330 } else if (this->type
->qualifier
.flags
.q
.out
) {
4331 _mesa_glsl_error(& loc
, state
,
4332 "`varying out' qualifier in declaration of "
4333 "`%s' only valid for geometry shaders using "
4334 "ARB_geometry_shader4 or EXT_geometry_shader4",
4339 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4341 * "Global variables can only use the qualifiers const,
4342 * attribute, uniform, or varying. Only one may be
4345 * Local variables can only use the qualifier const."
4347 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4348 * any extension that adds the 'layout' keyword.
4350 if (!state
->is_version(130, 300)
4351 && !state
->has_explicit_attrib_location()
4352 && !state
->has_separate_shader_objects()
4353 && !state
->ARB_fragment_coord_conventions_enable
) {
4354 if (this->type
->qualifier
.flags
.q
.out
) {
4355 _mesa_glsl_error(& loc
, state
,
4356 "`out' qualifier in declaration of `%s' "
4357 "only valid for function parameters in %s",
4358 decl
->identifier
, state
->get_version_string());
4360 if (this->type
->qualifier
.flags
.q
.in
) {
4361 _mesa_glsl_error(& loc
, state
,
4362 "`in' qualifier in declaration of `%s' "
4363 "only valid for function parameters in %s",
4364 decl
->identifier
, state
->get_version_string());
4366 /* FINISHME: Test for other invalid qualifiers. */
4369 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4371 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4374 if (this->type
->qualifier
.flags
.q
.invariant
) {
4375 if (!is_varying_var(var
, state
->stage
)) {
4376 _mesa_glsl_error(&loc
, state
,
4377 "`%s' cannot be marked invariant; interfaces between "
4378 "shader stages only", var
->name
);
4382 if (state
->current_function
!= NULL
) {
4383 const char *mode
= NULL
;
4384 const char *extra
= "";
4386 /* There is no need to check for 'inout' here because the parser will
4387 * only allow that in function parameter lists.
4389 if (this->type
->qualifier
.flags
.q
.attribute
) {
4391 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4392 mode
= "subroutine uniform";
4393 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4395 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4397 } else if (this->type
->qualifier
.flags
.q
.in
) {
4399 extra
= " or in function parameter list";
4400 } else if (this->type
->qualifier
.flags
.q
.out
) {
4402 extra
= " or in function parameter list";
4406 _mesa_glsl_error(& loc
, state
,
4407 "%s variable `%s' must be declared at "
4409 mode
, var
->name
, extra
);
4411 } else if (var
->data
.mode
== ir_var_shader_in
) {
4412 var
->data
.read_only
= true;
4414 if (state
->stage
== MESA_SHADER_VERTEX
) {
4415 bool error_emitted
= false;
4417 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4419 * "Vertex shader inputs can only be float, floating-point
4420 * vectors, matrices, signed and unsigned integers and integer
4421 * vectors. Vertex shader inputs can also form arrays of these
4422 * types, but not structures."
4424 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4426 * "Vertex shader inputs can only be float, floating-point
4427 * vectors, matrices, signed and unsigned integers and integer
4428 * vectors. They cannot be arrays or structures."
4430 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4432 * "The attribute qualifier can be used only with float,
4433 * floating-point vectors, and matrices. Attribute variables
4434 * cannot be declared as arrays or structures."
4436 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4438 * "Vertex shader inputs can only be float, floating-point
4439 * vectors, matrices, signed and unsigned integers and integer
4440 * vectors. Vertex shader inputs cannot be arrays or
4443 const glsl_type
*check_type
= var
->type
->without_array();
4445 switch (check_type
->base_type
) {
4446 case GLSL_TYPE_FLOAT
:
4448 case GLSL_TYPE_UINT
:
4450 if (state
->is_version(120, 300))
4452 case GLSL_TYPE_DOUBLE
:
4453 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4457 _mesa_glsl_error(& loc
, state
,
4458 "vertex shader input / attribute cannot have "
4460 var
->type
->is_array() ? "array of " : "",
4462 error_emitted
= true;
4465 if (!error_emitted
&& var
->type
->is_array() &&
4466 !state
->check_version(150, 0, &loc
,
4467 "vertex shader input / attribute "
4468 "cannot have array type")) {
4469 error_emitted
= true;
4471 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4472 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4474 * Geometry shader input variables get the per-vertex values
4475 * written out by vertex shader output variables of the same
4476 * names. Since a geometry shader operates on a set of
4477 * vertices, each input varying variable (or input block, see
4478 * interface blocks below) needs to be declared as an array.
4480 if (!var
->type
->is_array()) {
4481 _mesa_glsl_error(&loc
, state
,
4482 "geometry shader inputs must be arrays");
4485 handle_geometry_shader_input_decl(state
, loc
, var
);
4486 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4487 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4489 * It is a compile-time error to declare a fragment shader
4490 * input with, or that contains, any of the following types:
4494 * * An array of arrays
4495 * * An array of structures
4496 * * A structure containing an array
4497 * * A structure containing a structure
4499 if (state
->es_shader
) {
4500 const glsl_type
*check_type
= var
->type
->without_array();
4501 if (check_type
->is_boolean() ||
4502 check_type
->contains_opaque()) {
4503 _mesa_glsl_error(&loc
, state
,
4504 "fragment shader input cannot have type %s",
4507 if (var
->type
->is_array() &&
4508 var
->type
->fields
.array
->is_array()) {
4509 _mesa_glsl_error(&loc
, state
,
4511 "cannot have an array of arrays",
4512 _mesa_shader_stage_to_string(state
->stage
));
4514 if (var
->type
->is_array() &&
4515 var
->type
->fields
.array
->is_record()) {
4516 _mesa_glsl_error(&loc
, state
,
4517 "fragment shader input "
4518 "cannot have an array of structs");
4520 if (var
->type
->is_record()) {
4521 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4522 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4523 var
->type
->fields
.structure
[i
].type
->is_record())
4524 _mesa_glsl_error(&loc
, state
,
4525 "fragement shader input cannot have "
4526 "a struct that contains an "
4531 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4532 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4533 handle_tess_shader_input_decl(state
, loc
, var
);
4535 } else if (var
->data
.mode
== ir_var_shader_out
) {
4536 const glsl_type
*check_type
= var
->type
->without_array();
4538 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4540 * It is a compile-time error to declare a vertex, tessellation
4541 * evaluation, tessellation control, or geometry shader output
4542 * that contains any of the following:
4544 * * A Boolean type (bool, bvec2 ...)
4547 if (check_type
->is_boolean() || check_type
->contains_opaque())
4548 _mesa_glsl_error(&loc
, state
,
4549 "%s shader output cannot have type %s",
4550 _mesa_shader_stage_to_string(state
->stage
),
4553 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4555 * It is a compile-time error to declare a fragment shader output
4556 * that contains any of the following:
4558 * * A Boolean type (bool, bvec2 ...)
4559 * * A double-precision scalar or vector (double, dvec2 ...)
4564 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4565 if (check_type
->is_record() || check_type
->is_matrix())
4566 _mesa_glsl_error(&loc
, state
,
4567 "fragment shader output "
4568 "cannot have struct or matrix type");
4569 switch (check_type
->base_type
) {
4570 case GLSL_TYPE_UINT
:
4572 case GLSL_TYPE_FLOAT
:
4575 _mesa_glsl_error(&loc
, state
,
4576 "fragment shader output cannot have "
4577 "type %s", check_type
->name
);
4581 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4583 * It is a compile-time error to declare a vertex shader output
4584 * with, or that contains, any of the following types:
4588 * * An array of arrays
4589 * * An array of structures
4590 * * A structure containing an array
4591 * * A structure containing a structure
4593 * It is a compile-time error to declare a fragment shader output
4594 * with, or that contains, any of the following types:
4600 * * An array of array
4602 if (state
->es_shader
) {
4603 if (var
->type
->is_array() &&
4604 var
->type
->fields
.array
->is_array()) {
4605 _mesa_glsl_error(&loc
, state
,
4607 "cannot have an array of arrays",
4608 _mesa_shader_stage_to_string(state
->stage
));
4610 if (state
->stage
== MESA_SHADER_VERTEX
) {
4611 if (var
->type
->is_array() &&
4612 var
->type
->fields
.array
->is_record()) {
4613 _mesa_glsl_error(&loc
, state
,
4614 "vertex shader output "
4615 "cannot have an array of structs");
4617 if (var
->type
->is_record()) {
4618 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4619 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4620 var
->type
->fields
.structure
[i
].type
->is_record())
4621 _mesa_glsl_error(&loc
, state
,
4622 "vertex shader output cannot have a "
4623 "struct that contains an "
4630 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4631 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4633 } else if (var
->type
->contains_subroutine()) {
4634 /* declare subroutine uniforms as hidden */
4635 var
->data
.how_declared
= ir_var_hidden
;
4638 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4639 * so must integer vertex outputs.
4641 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4642 * "Fragment shader inputs that are signed or unsigned integers or
4643 * integer vectors must be qualified with the interpolation qualifier
4646 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4647 * "Fragment shader inputs that are, or contain, signed or unsigned
4648 * integers or integer vectors must be qualified with the
4649 * interpolation qualifier flat."
4651 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4652 * "Vertex shader outputs that are, or contain, signed or unsigned
4653 * integers or integer vectors must be qualified with the
4654 * interpolation qualifier flat."
4656 * Note that prior to GLSL 1.50, this requirement applied to vertex
4657 * outputs rather than fragment inputs. That creates problems in the
4658 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4659 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4660 * apply the restriction to both vertex outputs and fragment inputs.
4662 * Note also that the desktop GLSL specs are missing the text "or
4663 * contain"; this is presumably an oversight, since there is no
4664 * reasonable way to interpolate a fragment shader input that contains
4667 if (state
->is_version(130, 300) &&
4668 var
->type
->contains_integer() &&
4669 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4670 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4671 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4672 && state
->es_shader
))) {
4673 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4674 "vertex output" : "fragment input";
4675 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4676 "an integer, then it must be qualified with 'flat'",
4680 /* Double fragment inputs must be qualified with 'flat'. */
4681 if (var
->type
->contains_double() &&
4682 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4683 state
->stage
== MESA_SHADER_FRAGMENT
&&
4684 var
->data
.mode
== ir_var_shader_in
) {
4685 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4686 "a double, then it must be qualified with 'flat'",
4690 /* Interpolation qualifiers cannot be applied to 'centroid' and
4691 * 'centroid varying'.
4693 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4694 * "interpolation qualifiers may only precede the qualifiers in,
4695 * centroid in, out, or centroid out in a declaration. They do not apply
4696 * to the deprecated storage qualifiers varying or centroid varying."
4698 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4700 if (state
->is_version(130, 0)
4701 && this->type
->qualifier
.has_interpolation()
4702 && this->type
->qualifier
.flags
.q
.varying
) {
4704 const char *i
= interpolation_string(var
->data
.interpolation
);
4706 if (this->type
->qualifier
.flags
.q
.centroid
)
4707 s
= "centroid varying";
4711 _mesa_glsl_error(&loc
, state
,
4712 "qualifier '%s' cannot be applied to the "
4713 "deprecated storage qualifier '%s'", i
, s
);
4717 /* Interpolation qualifiers can only apply to vertex shader outputs and
4718 * fragment shader inputs.
4720 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4721 * "Outputs from a vertex shader (out) and inputs to a fragment
4722 * shader (in) can be further qualified with one or more of these
4723 * interpolation qualifiers"
4725 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4726 * "These interpolation qualifiers may only precede the qualifiers
4727 * in, centroid in, out, or centroid out in a declaration. They do
4728 * not apply to inputs into a vertex shader or outputs from a
4731 if (state
->is_version(130, 300)
4732 && this->type
->qualifier
.has_interpolation()) {
4734 const char *i
= interpolation_string(var
->data
.interpolation
);
4735 switch (state
->stage
) {
4736 case MESA_SHADER_VERTEX
:
4737 if (this->type
->qualifier
.flags
.q
.in
) {
4738 _mesa_glsl_error(&loc
, state
,
4739 "qualifier '%s' cannot be applied to vertex "
4740 "shader inputs", i
);
4743 case MESA_SHADER_FRAGMENT
:
4744 if (this->type
->qualifier
.flags
.q
.out
) {
4745 _mesa_glsl_error(&loc
, state
,
4746 "qualifier '%s' cannot be applied to fragment "
4747 "shader outputs", i
);
4756 /* From section 4.3.4 of the GLSL 4.00 spec:
4757 * "Input variables may not be declared using the patch in qualifier
4758 * in tessellation control or geometry shaders."
4760 * From section 4.3.6 of the GLSL 4.00 spec:
4761 * "It is an error to use patch out in a vertex, tessellation
4762 * evaluation, or geometry shader."
4764 * This doesn't explicitly forbid using them in a fragment shader, but
4765 * that's probably just an oversight.
4767 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4768 && this->type
->qualifier
.flags
.q
.patch
4769 && this->type
->qualifier
.flags
.q
.in
) {
4771 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4772 "tessellation evaluation shader");
4775 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4776 && this->type
->qualifier
.flags
.q
.patch
4777 && this->type
->qualifier
.flags
.q
.out
) {
4779 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4780 "tessellation control shader");
4783 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4785 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4786 state
->check_precision_qualifiers_allowed(&loc
);
4790 /* If a precision qualifier is allowed on a type, it is allowed on
4791 * an array of that type.
4793 if (!(this->type
->qualifier
.precision
== ast_precision_none
4794 || precision_qualifier_allowed(var
->type
->without_array()))) {
4796 _mesa_glsl_error(&loc
, state
,
4797 "precision qualifiers apply only to floating point"
4798 ", integer and opaque types");
4801 /* From section 4.1.7 of the GLSL 4.40 spec:
4803 * "[Opaque types] can only be declared as function
4804 * parameters or uniform-qualified variables."
4806 if (var_type
->contains_opaque() &&
4807 !this->type
->qualifier
.flags
.q
.uniform
) {
4808 _mesa_glsl_error(&loc
, state
,
4809 "opaque variables must be declared uniform");
4812 /* Process the initializer and add its instructions to a temporary
4813 * list. This list will be added to the instruction stream (below) after
4814 * the declaration is added. This is done because in some cases (such as
4815 * redeclarations) the declaration may not actually be added to the
4816 * instruction stream.
4818 exec_list initializer_instructions
;
4820 /* Examine var name here since var may get deleted in the next call */
4821 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4823 ir_variable
*earlier
=
4824 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4825 false /* allow_all_redeclarations */);
4826 if (earlier
!= NULL
) {
4828 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4829 _mesa_glsl_error(&loc
, state
,
4830 "`%s' has already been redeclared using "
4831 "gl_PerVertex", earlier
->name
);
4833 earlier
->data
.how_declared
= ir_var_declared_normally
;
4836 if (decl
->initializer
!= NULL
) {
4837 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4839 &initializer_instructions
, state
);
4841 validate_array_dimensions(var_type
, state
, &loc
);
4844 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4846 * "It is an error to write to a const variable outside of
4847 * its declaration, so they must be initialized when
4850 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4851 _mesa_glsl_error(& loc
, state
,
4852 "const declaration of `%s' must be initialized",
4856 if (state
->es_shader
) {
4857 const glsl_type
*const t
= (earlier
== NULL
)
4858 ? var
->type
: earlier
->type
;
4860 if (t
->is_unsized_array())
4861 /* Section 10.17 of the GLSL ES 1.00 specification states that
4862 * unsized array declarations have been removed from the language.
4863 * Arrays that are sized using an initializer are still explicitly
4864 * sized. However, GLSL ES 1.00 does not allow array
4865 * initializers. That is only allowed in GLSL ES 3.00.
4867 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4869 * "An array type can also be formed without specifying a size
4870 * if the definition includes an initializer:
4872 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4873 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4878 _mesa_glsl_error(& loc
, state
,
4879 "unsized array declarations are not allowed in "
4883 /* If the declaration is not a redeclaration, there are a few additional
4884 * semantic checks that must be applied. In addition, variable that was
4885 * created for the declaration should be added to the IR stream.
4887 if (earlier
== NULL
) {
4888 validate_identifier(decl
->identifier
, loc
, state
);
4890 /* Add the variable to the symbol table. Note that the initializer's
4891 * IR was already processed earlier (though it hasn't been emitted
4892 * yet), without the variable in scope.
4894 * This differs from most C-like languages, but it follows the GLSL
4895 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4898 * "Within a declaration, the scope of a name starts immediately
4899 * after the initializer if present or immediately after the name
4900 * being declared if not."
4902 if (!state
->symbols
->add_variable(var
)) {
4903 YYLTYPE loc
= this->get_location();
4904 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4905 "current scope", decl
->identifier
);
4909 /* Push the variable declaration to the top. It means that all the
4910 * variable declarations will appear in a funny last-to-first order,
4911 * but otherwise we run into trouble if a function is prototyped, a
4912 * global var is decled, then the function is defined with usage of
4913 * the global var. See glslparsertest's CorrectModule.frag.
4915 instructions
->push_head(var
);
4918 instructions
->append_list(&initializer_instructions
);
4922 /* Generally, variable declarations do not have r-values. However,
4923 * one is used for the declaration in
4925 * while (bool b = some_condition()) {
4929 * so we return the rvalue from the last seen declaration here.
4936 ast_parameter_declarator::hir(exec_list
*instructions
,
4937 struct _mesa_glsl_parse_state
*state
)
4940 const struct glsl_type
*type
;
4941 const char *name
= NULL
;
4942 YYLTYPE loc
= this->get_location();
4944 type
= this->type
->glsl_type(& name
, state
);
4948 _mesa_glsl_error(& loc
, state
,
4949 "invalid type `%s' in declaration of `%s'",
4950 name
, this->identifier
);
4952 _mesa_glsl_error(& loc
, state
,
4953 "invalid type in declaration of `%s'",
4957 type
= glsl_type::error_type
;
4960 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4962 * "Functions that accept no input arguments need not use void in the
4963 * argument list because prototypes (or definitions) are required and
4964 * therefore there is no ambiguity when an empty argument list "( )" is
4965 * declared. The idiom "(void)" as a parameter list is provided for
4968 * Placing this check here prevents a void parameter being set up
4969 * for a function, which avoids tripping up checks for main taking
4970 * parameters and lookups of an unnamed symbol.
4972 if (type
->is_void()) {
4973 if (this->identifier
!= NULL
)
4974 _mesa_glsl_error(& loc
, state
,
4975 "named parameter cannot have type `void'");
4981 if (formal_parameter
&& (this->identifier
== NULL
)) {
4982 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4986 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4987 * call already handled the "vec4[..] foo" case.
4989 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4991 if (!type
->is_error() && type
->is_unsized_array()) {
4992 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4994 type
= glsl_type::error_type
;
4998 ir_variable
*var
= new(ctx
)
4999 ir_variable(type
, this->identifier
, ir_var_function_in
);
5001 /* Apply any specified qualifiers to the parameter declaration. Note that
5002 * for function parameters the default mode is 'in'.
5004 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5007 /* From section 4.1.7 of the GLSL 4.40 spec:
5009 * "Opaque variables cannot be treated as l-values; hence cannot
5010 * be used as out or inout function parameters, nor can they be
5013 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5014 && type
->contains_opaque()) {
5015 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5016 "contain opaque variables");
5017 type
= glsl_type::error_type
;
5020 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5022 * "When calling a function, expressions that do not evaluate to
5023 * l-values cannot be passed to parameters declared as out or inout."
5025 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5027 * "Other binary or unary expressions, non-dereferenced arrays,
5028 * function names, swizzles with repeated fields, and constants
5029 * cannot be l-values."
5031 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5032 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5034 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5036 && !state
->check_version(120, 100, &loc
,
5037 "arrays cannot be out or inout parameters")) {
5038 type
= glsl_type::error_type
;
5041 instructions
->push_tail(var
);
5043 /* Parameter declarations do not have r-values.
5050 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5052 exec_list
*ir_parameters
,
5053 _mesa_glsl_parse_state
*state
)
5055 ast_parameter_declarator
*void_param
= NULL
;
5058 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5059 param
->formal_parameter
= formal
;
5060 param
->hir(ir_parameters
, state
);
5068 if ((void_param
!= NULL
) && (count
> 1)) {
5069 YYLTYPE loc
= void_param
->get_location();
5071 _mesa_glsl_error(& loc
, state
,
5072 "`void' parameter must be only parameter");
5078 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5080 /* IR invariants disallow function declarations or definitions
5081 * nested within other function definitions. But there is no
5082 * requirement about the relative order of function declarations
5083 * and definitions with respect to one another. So simply insert
5084 * the new ir_function block at the end of the toplevel instruction
5087 state
->toplevel_ir
->push_tail(f
);
5092 ast_function::hir(exec_list
*instructions
,
5093 struct _mesa_glsl_parse_state
*state
)
5096 ir_function
*f
= NULL
;
5097 ir_function_signature
*sig
= NULL
;
5098 exec_list hir_parameters
;
5099 YYLTYPE loc
= this->get_location();
5101 const char *const name
= identifier
;
5103 /* New functions are always added to the top-level IR instruction stream,
5104 * so this instruction list pointer is ignored. See also emit_function
5107 (void) instructions
;
5109 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5111 * "Function declarations (prototypes) cannot occur inside of functions;
5112 * they must be at global scope, or for the built-in functions, outside
5113 * the global scope."
5115 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5117 * "User defined functions may only be defined within the global scope."
5119 * Note that this language does not appear in GLSL 1.10.
5121 if ((state
->current_function
!= NULL
) &&
5122 state
->is_version(120, 100)) {
5123 YYLTYPE loc
= this->get_location();
5124 _mesa_glsl_error(&loc
, state
,
5125 "declaration of function `%s' not allowed within "
5126 "function body", name
);
5129 validate_identifier(name
, this->get_location(), state
);
5131 /* Convert the list of function parameters to HIR now so that they can be
5132 * used below to compare this function's signature with previously seen
5133 * signatures for functions with the same name.
5135 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5137 & hir_parameters
, state
);
5139 const char *return_type_name
;
5140 const glsl_type
*return_type
=
5141 this->return_type
->glsl_type(& return_type_name
, state
);
5144 YYLTYPE loc
= this->get_location();
5145 _mesa_glsl_error(&loc
, state
,
5146 "function `%s' has undeclared return type `%s'",
5147 name
, return_type_name
);
5148 return_type
= glsl_type::error_type
;
5151 /* ARB_shader_subroutine states:
5152 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5153 * subroutine(...) to a function declaration."
5155 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5156 YYLTYPE loc
= this->get_location();
5157 _mesa_glsl_error(&loc
, state
,
5158 "function declaration `%s' cannot have subroutine prepended",
5162 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5163 * "No qualifier is allowed on the return type of a function."
5165 if (this->return_type
->has_qualifiers(state
)) {
5166 YYLTYPE loc
= this->get_location();
5167 _mesa_glsl_error(& loc
, state
,
5168 "function `%s' return type has qualifiers", name
);
5171 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5173 * "Arrays are allowed as arguments and as the return type. In both
5174 * cases, the array must be explicitly sized."
5176 if (return_type
->is_unsized_array()) {
5177 YYLTYPE loc
= this->get_location();
5178 _mesa_glsl_error(& loc
, state
,
5179 "function `%s' return type array must be explicitly "
5183 /* From section 4.1.7 of the GLSL 4.40 spec:
5185 * "[Opaque types] can only be declared as function parameters
5186 * or uniform-qualified variables."
5188 if (return_type
->contains_opaque()) {
5189 YYLTYPE loc
= this->get_location();
5190 _mesa_glsl_error(&loc
, state
,
5191 "function `%s' return type can't contain an opaque type",
5195 /* Create an ir_function if one doesn't already exist. */
5196 f
= state
->symbols
->get_function(name
);
5198 f
= new(ctx
) ir_function(name
);
5199 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5200 if (!state
->symbols
->add_function(f
)) {
5201 /* This function name shadows a non-function use of the same name. */
5202 YYLTYPE loc
= this->get_location();
5203 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5204 "non-function", name
);
5208 emit_function(state
, f
);
5211 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5213 * "A shader cannot redefine or overload built-in functions."
5215 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5217 * "User code can overload the built-in functions but cannot redefine
5220 if (state
->es_shader
&& state
->language_version
>= 300) {
5221 /* Local shader has no exact candidates; check the built-ins. */
5222 _mesa_glsl_initialize_builtin_functions();
5223 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5224 YYLTYPE loc
= this->get_location();
5225 _mesa_glsl_error(& loc
, state
,
5226 "A shader cannot redefine or overload built-in "
5227 "function `%s' in GLSL ES 3.00", name
);
5232 /* Verify that this function's signature either doesn't match a previously
5233 * seen signature for a function with the same name, or, if a match is found,
5234 * that the previously seen signature does not have an associated definition.
5236 if (state
->es_shader
|| f
->has_user_signature()) {
5237 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5239 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5240 if (badvar
!= NULL
) {
5241 YYLTYPE loc
= this->get_location();
5243 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5244 "qualifiers don't match prototype", name
, badvar
);
5247 if (sig
->return_type
!= return_type
) {
5248 YYLTYPE loc
= this->get_location();
5250 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5251 "match prototype", name
);
5254 if (sig
->is_defined
) {
5255 if (is_definition
) {
5256 YYLTYPE loc
= this->get_location();
5257 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5259 /* We just encountered a prototype that exactly matches a
5260 * function that's already been defined. This is redundant,
5261 * and we should ignore it.
5269 /* Verify the return type of main() */
5270 if (strcmp(name
, "main") == 0) {
5271 if (! return_type
->is_void()) {
5272 YYLTYPE loc
= this->get_location();
5274 _mesa_glsl_error(& loc
, state
, "main() must return void");
5277 if (!hir_parameters
.is_empty()) {
5278 YYLTYPE loc
= this->get_location();
5280 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5284 /* Finish storing the information about this new function in its signature.
5287 sig
= new(ctx
) ir_function_signature(return_type
);
5288 f
->add_signature(sig
);
5291 sig
->replace_parameters(&hir_parameters
);
5294 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5297 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5298 unsigned qual_index
;
5299 if (process_qualifier_constant(state
, &loc
, "index",
5300 this->return_type
->qualifier
.index
,
5302 if (!state
->has_explicit_uniform_location()) {
5303 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5304 "GL_ARB_explicit_uniform_location or "
5306 } else if (qual_index
>= MAX_SUBROUTINES
) {
5307 _mesa_glsl_error(&loc
, state
,
5308 "invalid subroutine index (%d) index must "
5309 "be a number between 0 and "
5310 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5311 MAX_SUBROUTINES
- 1);
5313 f
->subroutine_index
= qual_index
;
5318 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5319 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5320 f
->num_subroutine_types
);
5322 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5323 const struct glsl_type
*type
;
5324 /* the subroutine type must be already declared */
5325 type
= state
->symbols
->get_type(decl
->identifier
);
5327 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5329 f
->subroutine_types
[idx
++] = type
;
5331 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5333 state
->num_subroutines
+ 1);
5334 state
->subroutines
[state
->num_subroutines
] = f
;
5335 state
->num_subroutines
++;
5339 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5340 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5341 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5344 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5346 state
->num_subroutine_types
+ 1);
5347 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5348 state
->num_subroutine_types
++;
5350 f
->is_subroutine
= true;
5353 /* Function declarations (prototypes) do not have r-values.
5360 ast_function_definition::hir(exec_list
*instructions
,
5361 struct _mesa_glsl_parse_state
*state
)
5363 prototype
->is_definition
= true;
5364 prototype
->hir(instructions
, state
);
5366 ir_function_signature
*signature
= prototype
->signature
;
5367 if (signature
== NULL
)
5370 assert(state
->current_function
== NULL
);
5371 state
->current_function
= signature
;
5372 state
->found_return
= false;
5374 /* Duplicate parameters declared in the prototype as concrete variables.
5375 * Add these to the symbol table.
5377 state
->symbols
->push_scope();
5378 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5379 assert(var
->as_variable() != NULL
);
5381 /* The only way a parameter would "exist" is if two parameters have
5384 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5385 YYLTYPE loc
= this->get_location();
5387 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5389 state
->symbols
->add_variable(var
);
5393 /* Convert the body of the function to HIR. */
5394 this->body
->hir(&signature
->body
, state
);
5395 signature
->is_defined
= true;
5397 state
->symbols
->pop_scope();
5399 assert(state
->current_function
== signature
);
5400 state
->current_function
= NULL
;
5402 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5403 YYLTYPE loc
= this->get_location();
5404 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5405 "%s, but no return statement",
5406 signature
->function_name(),
5407 signature
->return_type
->name
);
5410 /* Function definitions do not have r-values.
5417 ast_jump_statement::hir(exec_list
*instructions
,
5418 struct _mesa_glsl_parse_state
*state
)
5425 assert(state
->current_function
);
5427 if (opt_return_value
) {
5428 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5430 /* The value of the return type can be NULL if the shader says
5431 * 'return foo();' and foo() is a function that returns void.
5433 * NOTE: The GLSL spec doesn't say that this is an error. The type
5434 * of the return value is void. If the return type of the function is
5435 * also void, then this should compile without error. Seriously.
5437 const glsl_type
*const ret_type
=
5438 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5440 /* Implicit conversions are not allowed for return values prior to
5441 * ARB_shading_language_420pack.
5443 if (state
->current_function
->return_type
!= ret_type
) {
5444 YYLTYPE loc
= this->get_location();
5446 if (state
->has_420pack()) {
5447 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5449 _mesa_glsl_error(& loc
, state
,
5450 "could not implicitly convert return value "
5451 "to %s, in function `%s'",
5452 state
->current_function
->return_type
->name
,
5453 state
->current_function
->function_name());
5456 _mesa_glsl_error(& loc
, state
,
5457 "`return' with wrong type %s, in function `%s' "
5460 state
->current_function
->function_name(),
5461 state
->current_function
->return_type
->name
);
5463 } else if (state
->current_function
->return_type
->base_type
==
5465 YYLTYPE loc
= this->get_location();
5467 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5468 * specs add a clarification:
5470 * "A void function can only use return without a return argument, even if
5471 * the return argument has void type. Return statements only accept values:
5474 * void func2() { return func1(); } // illegal return statement"
5476 _mesa_glsl_error(& loc
, state
,
5477 "void functions can only use `return' without a "
5481 inst
= new(ctx
) ir_return(ret
);
5483 if (state
->current_function
->return_type
->base_type
!=
5485 YYLTYPE loc
= this->get_location();
5487 _mesa_glsl_error(& loc
, state
,
5488 "`return' with no value, in function %s returning "
5490 state
->current_function
->function_name());
5492 inst
= new(ctx
) ir_return
;
5495 state
->found_return
= true;
5496 instructions
->push_tail(inst
);
5501 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5502 YYLTYPE loc
= this->get_location();
5504 _mesa_glsl_error(& loc
, state
,
5505 "`discard' may only appear in a fragment shader");
5507 instructions
->push_tail(new(ctx
) ir_discard
);
5512 if (mode
== ast_continue
&&
5513 state
->loop_nesting_ast
== NULL
) {
5514 YYLTYPE loc
= this->get_location();
5516 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5517 } else if (mode
== ast_break
&&
5518 state
->loop_nesting_ast
== NULL
&&
5519 state
->switch_state
.switch_nesting_ast
== NULL
) {
5520 YYLTYPE loc
= this->get_location();
5522 _mesa_glsl_error(& loc
, state
,
5523 "break may only appear in a loop or a switch");
5525 /* For a loop, inline the for loop expression again, since we don't
5526 * know where near the end of the loop body the normal copy of it is
5527 * going to be placed. Same goes for the condition for a do-while
5530 if (state
->loop_nesting_ast
!= NULL
&&
5531 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5532 if (state
->loop_nesting_ast
->rest_expression
) {
5533 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5536 if (state
->loop_nesting_ast
->mode
==
5537 ast_iteration_statement::ast_do_while
) {
5538 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5542 if (state
->switch_state
.is_switch_innermost
&&
5543 mode
== ast_continue
) {
5544 /* Set 'continue_inside' to true. */
5545 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5546 ir_dereference_variable
*deref_continue_inside_var
=
5547 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5548 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5551 /* Break out from the switch, continue for the loop will
5552 * be called right after switch. */
5553 ir_loop_jump
*const jump
=
5554 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5555 instructions
->push_tail(jump
);
5557 } else if (state
->switch_state
.is_switch_innermost
&&
5558 mode
== ast_break
) {
5559 /* Force break out of switch by inserting a break. */
5560 ir_loop_jump
*const jump
=
5561 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5562 instructions
->push_tail(jump
);
5564 ir_loop_jump
*const jump
=
5565 new(ctx
) ir_loop_jump((mode
== ast_break
)
5566 ? ir_loop_jump::jump_break
5567 : ir_loop_jump::jump_continue
);
5568 instructions
->push_tail(jump
);
5575 /* Jump instructions do not have r-values.
5582 ast_selection_statement::hir(exec_list
*instructions
,
5583 struct _mesa_glsl_parse_state
*state
)
5587 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5589 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5591 * "Any expression whose type evaluates to a Boolean can be used as the
5592 * conditional expression bool-expression. Vector types are not accepted
5593 * as the expression to if."
5595 * The checks are separated so that higher quality diagnostics can be
5596 * generated for cases where both rules are violated.
5598 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5599 YYLTYPE loc
= this->condition
->get_location();
5601 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5605 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5607 if (then_statement
!= NULL
) {
5608 state
->symbols
->push_scope();
5609 then_statement
->hir(& stmt
->then_instructions
, state
);
5610 state
->symbols
->pop_scope();
5613 if (else_statement
!= NULL
) {
5614 state
->symbols
->push_scope();
5615 else_statement
->hir(& stmt
->else_instructions
, state
);
5616 state
->symbols
->pop_scope();
5619 instructions
->push_tail(stmt
);
5621 /* if-statements do not have r-values.
5628 ast_switch_statement::hir(exec_list
*instructions
,
5629 struct _mesa_glsl_parse_state
*state
)
5633 ir_rvalue
*const test_expression
=
5634 this->test_expression
->hir(instructions
, state
);
5636 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5638 * "The type of init-expression in a switch statement must be a
5641 if (!test_expression
->type
->is_scalar() ||
5642 !test_expression
->type
->is_integer()) {
5643 YYLTYPE loc
= this->test_expression
->get_location();
5645 _mesa_glsl_error(& loc
,
5647 "switch-statement expression must be scalar "
5651 /* Track the switch-statement nesting in a stack-like manner.
5653 struct glsl_switch_state saved
= state
->switch_state
;
5655 state
->switch_state
.is_switch_innermost
= true;
5656 state
->switch_state
.switch_nesting_ast
= this;
5657 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5658 hash_table_pointer_compare
);
5659 state
->switch_state
.previous_default
= NULL
;
5661 /* Initalize is_fallthru state to false.
5663 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5664 state
->switch_state
.is_fallthru_var
=
5665 new(ctx
) ir_variable(glsl_type::bool_type
,
5666 "switch_is_fallthru_tmp",
5668 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5670 ir_dereference_variable
*deref_is_fallthru_var
=
5671 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5672 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5675 /* Initialize continue_inside state to false.
5677 state
->switch_state
.continue_inside
=
5678 new(ctx
) ir_variable(glsl_type::bool_type
,
5679 "continue_inside_tmp",
5681 instructions
->push_tail(state
->switch_state
.continue_inside
);
5683 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5684 ir_dereference_variable
*deref_continue_inside_var
=
5685 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5686 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5689 state
->switch_state
.run_default
=
5690 new(ctx
) ir_variable(glsl_type::bool_type
,
5693 instructions
->push_tail(state
->switch_state
.run_default
);
5695 /* Loop around the switch is used for flow control. */
5696 ir_loop
* loop
= new(ctx
) ir_loop();
5697 instructions
->push_tail(loop
);
5699 /* Cache test expression.
5701 test_to_hir(&loop
->body_instructions
, state
);
5703 /* Emit code for body of switch stmt.
5705 body
->hir(&loop
->body_instructions
, state
);
5707 /* Insert a break at the end to exit loop. */
5708 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5709 loop
->body_instructions
.push_tail(jump
);
5711 /* If we are inside loop, check if continue got called inside switch. */
5712 if (state
->loop_nesting_ast
!= NULL
) {
5713 ir_dereference_variable
*deref_continue_inside
=
5714 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5715 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5716 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5718 if (state
->loop_nesting_ast
!= NULL
) {
5719 if (state
->loop_nesting_ast
->rest_expression
) {
5720 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5723 if (state
->loop_nesting_ast
->mode
==
5724 ast_iteration_statement::ast_do_while
) {
5725 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5728 irif
->then_instructions
.push_tail(jump
);
5729 instructions
->push_tail(irif
);
5732 hash_table_dtor(state
->switch_state
.labels_ht
);
5734 state
->switch_state
= saved
;
5736 /* Switch statements do not have r-values. */
5742 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5743 struct _mesa_glsl_parse_state
*state
)
5747 /* Cache value of test expression. */
5748 ir_rvalue
*const test_val
=
5749 test_expression
->hir(instructions
,
5752 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5755 ir_dereference_variable
*deref_test_var
=
5756 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5758 instructions
->push_tail(state
->switch_state
.test_var
);
5759 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5764 ast_switch_body::hir(exec_list
*instructions
,
5765 struct _mesa_glsl_parse_state
*state
)
5768 stmts
->hir(instructions
, state
);
5770 /* Switch bodies do not have r-values. */
5775 ast_case_statement_list::hir(exec_list
*instructions
,
5776 struct _mesa_glsl_parse_state
*state
)
5778 exec_list default_case
, after_default
, tmp
;
5780 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5781 case_stmt
->hir(&tmp
, state
);
5784 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5785 default_case
.append_list(&tmp
);
5789 /* If default case found, append 'after_default' list. */
5790 if (!default_case
.is_empty())
5791 after_default
.append_list(&tmp
);
5793 instructions
->append_list(&tmp
);
5796 /* Handle the default case. This is done here because default might not be
5797 * the last case. We need to add checks against following cases first to see
5798 * if default should be chosen or not.
5800 if (!default_case
.is_empty()) {
5802 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5803 ir_dereference_variable
*deref_run_default_var
=
5804 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5806 /* Choose to run default case initially, following conditional
5807 * assignments might change this.
5809 ir_assignment
*const init_var
=
5810 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5811 instructions
->push_tail(init_var
);
5813 /* Default case was the last one, no checks required. */
5814 if (after_default
.is_empty()) {
5815 instructions
->append_list(&default_case
);
5819 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5820 ir_assignment
*assign
= ir
->as_assignment();
5825 /* Clone the check between case label and init expression. */
5826 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5827 ir_expression
*clone
= exp
->clone(state
, NULL
);
5829 ir_dereference_variable
*deref_var
=
5830 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5831 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5833 ir_assignment
*const set_false
=
5834 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5836 instructions
->push_tail(set_false
);
5839 /* Append default case and all cases after it. */
5840 instructions
->append_list(&default_case
);
5841 instructions
->append_list(&after_default
);
5844 /* Case statements do not have r-values. */
5849 ast_case_statement::hir(exec_list
*instructions
,
5850 struct _mesa_glsl_parse_state
*state
)
5852 labels
->hir(instructions
, state
);
5854 /* Guard case statements depending on fallthru state. */
5855 ir_dereference_variable
*const deref_fallthru_guard
=
5856 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5857 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5859 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5860 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5862 instructions
->push_tail(test_fallthru
);
5864 /* Case statements do not have r-values. */
5870 ast_case_label_list::hir(exec_list
*instructions
,
5871 struct _mesa_glsl_parse_state
*state
)
5873 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5874 label
->hir(instructions
, state
);
5876 /* Case labels do not have r-values. */
5881 ast_case_label::hir(exec_list
*instructions
,
5882 struct _mesa_glsl_parse_state
*state
)
5886 ir_dereference_variable
*deref_fallthru_var
=
5887 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5889 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5891 /* If not default case, ... */
5892 if (this->test_value
!= NULL
) {
5893 /* Conditionally set fallthru state based on
5894 * comparison of cached test expression value to case label.
5896 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5897 ir_constant
*label_const
= label_rval
->constant_expression_value();
5900 YYLTYPE loc
= this->test_value
->get_location();
5902 _mesa_glsl_error(& loc
, state
,
5903 "switch statement case label must be a "
5904 "constant expression");
5906 /* Stuff a dummy value in to allow processing to continue. */
5907 label_const
= new(ctx
) ir_constant(0);
5909 ast_expression
*previous_label
= (ast_expression
*)
5910 hash_table_find(state
->switch_state
.labels_ht
,
5911 (void *)(uintptr_t)label_const
->value
.u
[0]);
5913 if (previous_label
) {
5914 YYLTYPE loc
= this->test_value
->get_location();
5915 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5917 loc
= previous_label
->get_location();
5918 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5920 hash_table_insert(state
->switch_state
.labels_ht
,
5922 (void *)(uintptr_t)label_const
->value
.u
[0]);
5926 ir_dereference_variable
*deref_test_var
=
5927 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5929 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5934 * From GLSL 4.40 specification section 6.2 ("Selection"):
5936 * "The type of the init-expression value in a switch statement must
5937 * be a scalar int or uint. The type of the constant-expression value
5938 * in a case label also must be a scalar int or uint. When any pair
5939 * of these values is tested for "equal value" and the types do not
5940 * match, an implicit conversion will be done to convert the int to a
5941 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5944 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5945 YYLTYPE loc
= this->test_value
->get_location();
5947 const glsl_type
*type_a
= label_const
->type
;
5948 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5950 /* Check if int->uint implicit conversion is supported. */
5951 bool integer_conversion_supported
=
5952 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5955 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5956 !integer_conversion_supported
) {
5957 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5958 "init-expression and case label (%s != %s)",
5959 type_a
->name
, type_b
->name
);
5961 /* Conversion of the case label. */
5962 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5963 if (!apply_implicit_conversion(glsl_type::uint_type
,
5964 test_cond
->operands
[0], state
))
5965 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5967 /* Conversion of the init-expression value. */
5968 if (!apply_implicit_conversion(glsl_type::uint_type
,
5969 test_cond
->operands
[1], state
))
5970 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5975 ir_assignment
*set_fallthru_on_test
=
5976 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5978 instructions
->push_tail(set_fallthru_on_test
);
5979 } else { /* default case */
5980 if (state
->switch_state
.previous_default
) {
5981 YYLTYPE loc
= this->get_location();
5982 _mesa_glsl_error(& loc
, state
,
5983 "multiple default labels in one switch");
5985 loc
= state
->switch_state
.previous_default
->get_location();
5986 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5988 state
->switch_state
.previous_default
= this;
5990 /* Set fallthru condition on 'run_default' bool. */
5991 ir_dereference_variable
*deref_run_default
=
5992 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5993 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5994 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5998 /* Set falltrhu state. */
5999 ir_assignment
*set_fallthru
=
6000 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6002 instructions
->push_tail(set_fallthru
);
6005 /* Case statements do not have r-values. */
6010 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6011 struct _mesa_glsl_parse_state
*state
)
6015 if (condition
!= NULL
) {
6016 ir_rvalue
*const cond
=
6017 condition
->hir(instructions
, state
);
6020 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6021 YYLTYPE loc
= condition
->get_location();
6023 _mesa_glsl_error(& loc
, state
,
6024 "loop condition must be scalar boolean");
6026 /* As the first code in the loop body, generate a block that looks
6027 * like 'if (!condition) break;' as the loop termination condition.
6029 ir_rvalue
*const not_cond
=
6030 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6032 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6034 ir_jump
*const break_stmt
=
6035 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6037 if_stmt
->then_instructions
.push_tail(break_stmt
);
6038 instructions
->push_tail(if_stmt
);
6045 ast_iteration_statement::hir(exec_list
*instructions
,
6046 struct _mesa_glsl_parse_state
*state
)
6050 /* For-loops and while-loops start a new scope, but do-while loops do not.
6052 if (mode
!= ast_do_while
)
6053 state
->symbols
->push_scope();
6055 if (init_statement
!= NULL
)
6056 init_statement
->hir(instructions
, state
);
6058 ir_loop
*const stmt
= new(ctx
) ir_loop();
6059 instructions
->push_tail(stmt
);
6061 /* Track the current loop nesting. */
6062 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6064 state
->loop_nesting_ast
= this;
6066 /* Likewise, indicate that following code is closest to a loop,
6067 * NOT closest to a switch.
6069 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6070 state
->switch_state
.is_switch_innermost
= false;
6072 if (mode
!= ast_do_while
)
6073 condition_to_hir(&stmt
->body_instructions
, state
);
6076 body
->hir(& stmt
->body_instructions
, state
);
6078 if (rest_expression
!= NULL
)
6079 rest_expression
->hir(& stmt
->body_instructions
, state
);
6081 if (mode
== ast_do_while
)
6082 condition_to_hir(&stmt
->body_instructions
, state
);
6084 if (mode
!= ast_do_while
)
6085 state
->symbols
->pop_scope();
6087 /* Restore previous nesting before returning. */
6088 state
->loop_nesting_ast
= nesting_ast
;
6089 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6091 /* Loops do not have r-values.
6098 * Determine if the given type is valid for establishing a default precision
6101 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6103 * "The precision statement
6105 * precision precision-qualifier type;
6107 * can be used to establish a default precision qualifier. The type field
6108 * can be either int or float or any of the sampler types, and the
6109 * precision-qualifier can be lowp, mediump, or highp."
6111 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6112 * qualifiers on sampler types, but this seems like an oversight (since the
6113 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6114 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6118 is_valid_default_precision_type(const struct glsl_type
*const type
)
6123 switch (type
->base_type
) {
6125 case GLSL_TYPE_FLOAT
:
6126 /* "int" and "float" are valid, but vectors and matrices are not. */
6127 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6128 case GLSL_TYPE_SAMPLER
:
6129 case GLSL_TYPE_IMAGE
:
6130 case GLSL_TYPE_ATOMIC_UINT
:
6139 ast_type_specifier::hir(exec_list
*instructions
,
6140 struct _mesa_glsl_parse_state
*state
)
6142 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6145 YYLTYPE loc
= this->get_location();
6147 /* If this is a precision statement, check that the type to which it is
6148 * applied is either float or int.
6150 * From section 4.5.3 of the GLSL 1.30 spec:
6151 * "The precision statement
6152 * precision precision-qualifier type;
6153 * can be used to establish a default precision qualifier. The type
6154 * field can be either int or float [...]. Any other types or
6155 * qualifiers will result in an error.
6157 if (this->default_precision
!= ast_precision_none
) {
6158 if (!state
->check_precision_qualifiers_allowed(&loc
))
6161 if (this->structure
!= NULL
) {
6162 _mesa_glsl_error(&loc
, state
,
6163 "precision qualifiers do not apply to structures");
6167 if (this->array_specifier
!= NULL
) {
6168 _mesa_glsl_error(&loc
, state
,
6169 "default precision statements do not apply to "
6174 const struct glsl_type
*const type
=
6175 state
->symbols
->get_type(this->type_name
);
6176 if (!is_valid_default_precision_type(type
)) {
6177 _mesa_glsl_error(&loc
, state
,
6178 "default precision statements apply only to "
6179 "float, int, and opaque types");
6183 if (state
->es_shader
) {
6184 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6187 * "Non-precision qualified declarations will use the precision
6188 * qualifier specified in the most recent precision statement
6189 * that is still in scope. The precision statement has the same
6190 * scoping rules as variable declarations. If it is declared
6191 * inside a compound statement, its effect stops at the end of
6192 * the innermost statement it was declared in. Precision
6193 * statements in nested scopes override precision statements in
6194 * outer scopes. Multiple precision statements for the same basic
6195 * type can appear inside the same scope, with later statements
6196 * overriding earlier statements within that scope."
6198 * Default precision specifications follow the same scope rules as
6199 * variables. So, we can track the state of the default precision
6200 * qualifiers in the symbol table, and the rules will just work. This
6201 * is a slight abuse of the symbol table, but it has the semantics
6204 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6205 this->default_precision
);
6208 /* FINISHME: Translate precision statements into IR. */
6212 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6213 * process_record_constructor() can do type-checking on C-style initializer
6214 * expressions of structs, but ast_struct_specifier should only be translated
6215 * to HIR if it is declaring the type of a structure.
6217 * The ->is_declaration field is false for initializers of variables
6218 * declared separately from the struct's type definition.
6220 * struct S { ... }; (is_declaration = true)
6221 * struct T { ... } t = { ... }; (is_declaration = true)
6222 * S s = { ... }; (is_declaration = false)
6224 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6225 return this->structure
->hir(instructions
, state
);
6232 * Process a structure or interface block tree into an array of structure fields
6234 * After parsing, where there are some syntax differnces, structures and
6235 * interface blocks are almost identical. They are similar enough that the
6236 * AST for each can be processed the same way into a set of
6237 * \c glsl_struct_field to describe the members.
6239 * If we're processing an interface block, var_mode should be the type of the
6240 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6241 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6245 * The number of fields processed. A pointer to the array structure fields is
6246 * stored in \c *fields_ret.
6249 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6250 struct _mesa_glsl_parse_state
*state
,
6251 exec_list
*declarations
,
6252 glsl_struct_field
**fields_ret
,
6254 enum glsl_matrix_layout matrix_layout
,
6255 bool allow_reserved_names
,
6256 ir_variable_mode var_mode
,
6257 ast_type_qualifier
*layout
,
6258 unsigned block_stream
,
6259 unsigned expl_location
,
6260 unsigned expl_align
)
6262 unsigned decl_count
= 0;
6263 unsigned next_offset
= 0;
6265 /* Make an initial pass over the list of fields to determine how
6266 * many there are. Each element in this list is an ast_declarator_list.
6267 * This means that we actually need to count the number of elements in the
6268 * 'declarations' list in each of the elements.
6270 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6271 decl_count
+= decl_list
->declarations
.length();
6274 /* Allocate storage for the fields and process the field
6275 * declarations. As the declarations are processed, try to also convert
6276 * the types to HIR. This ensures that structure definitions embedded in
6277 * other structure definitions or in interface blocks are processed.
6279 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6282 bool first_member
= true;
6283 bool first_member_has_explicit_location
= false;
6286 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6287 const char *type_name
;
6288 YYLTYPE loc
= decl_list
->get_location();
6290 decl_list
->type
->specifier
->hir(instructions
, state
);
6292 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6294 * "Anonymous structures are not supported; so embedded structures
6295 * must have a declarator. A name given to an embedded struct is
6296 * scoped at the same level as the struct it is embedded in."
6298 * The same section of the GLSL 1.20 spec says:
6300 * "Anonymous structures are not supported. Embedded structures are
6303 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6304 * embedded structures in 1.10 only.
6306 if (state
->language_version
!= 110 &&
6307 decl_list
->type
->specifier
->structure
!= NULL
)
6308 _mesa_glsl_error(&loc
, state
,
6309 "embedded structure declarations are not allowed");
6311 const glsl_type
*decl_type
=
6312 decl_list
->type
->glsl_type(& type_name
, state
);
6314 const struct ast_type_qualifier
*const qual
=
6315 &decl_list
->type
->qualifier
;
6317 /* From section 4.3.9 of the GLSL 4.40 spec:
6319 * "[In interface blocks] opaque types are not allowed."
6321 * It should be impossible for decl_type to be NULL here. Cases that
6322 * might naturally lead to decl_type being NULL, especially for the
6323 * is_interface case, will have resulted in compilation having
6324 * already halted due to a syntax error.
6329 if (decl_type
->contains_opaque()) {
6330 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6331 "interface block contains opaque variable");
6334 if (decl_type
->contains_atomic()) {
6335 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6337 * "Members of structures cannot be declared as atomic counter
6340 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6343 if (decl_type
->contains_image()) {
6344 /* FINISHME: Same problem as with atomic counters.
6345 * FINISHME: Request clarification from Khronos and add
6346 * FINISHME: spec quotation here.
6348 _mesa_glsl_error(&loc
, state
, "image in structure");
6352 if (qual
->flags
.q
.explicit_binding
) {
6353 _mesa_glsl_error(&loc
, state
,
6354 "binding layout qualifier cannot be applied "
6355 "to struct or interface block members");
6359 if (!first_member
) {
6360 if (!layout
->flags
.q
.explicit_location
&&
6361 ((first_member_has_explicit_location
&&
6362 !qual
->flags
.q
.explicit_location
) ||
6363 (!first_member_has_explicit_location
&&
6364 qual
->flags
.q
.explicit_location
))) {
6365 _mesa_glsl_error(&loc
, state
,
6366 "when block-level location layout qualifier "
6367 "is not supplied either all members must "
6368 "have a location layout qualifier or all "
6369 "members must not have a location layout "
6373 first_member
= false;
6374 first_member_has_explicit_location
=
6375 qual
->flags
.q
.explicit_location
;
6379 if (qual
->flags
.q
.std140
||
6380 qual
->flags
.q
.std430
||
6381 qual
->flags
.q
.packed
||
6382 qual
->flags
.q
.shared
) {
6383 _mesa_glsl_error(&loc
, state
,
6384 "uniform/shader storage block layout qualifiers "
6385 "std140, std430, packed, and shared can only be "
6386 "applied to uniform/shader storage blocks, not "
6390 if (qual
->flags
.q
.constant
) {
6391 _mesa_glsl_error(&loc
, state
,
6392 "const storage qualifier cannot be applied "
6393 "to struct or interface block members");
6396 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6398 * "A block member may be declared with a stream identifier, but
6399 * the specified stream must match the stream associated with the
6400 * containing block."
6402 if (qual
->flags
.q
.explicit_stream
) {
6403 unsigned qual_stream
;
6404 if (process_qualifier_constant(state
, &loc
, "stream",
6405 qual
->stream
, &qual_stream
) &&
6406 qual_stream
!= block_stream
) {
6407 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6408 "interface block member does not match "
6409 "the interface block (%u vs %u)", qual_stream
,
6414 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6415 _mesa_glsl_error(&loc
, state
,
6416 "interpolation qualifiers cannot be used "
6417 "with uniform interface blocks");
6420 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6421 qual
->has_auxiliary_storage()) {
6422 _mesa_glsl_error(&loc
, state
,
6423 "auxiliary storage qualifiers cannot be used "
6424 "in uniform blocks or structures.");
6427 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6428 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6429 _mesa_glsl_error(&loc
, state
,
6430 "row_major and column_major can only be "
6431 "applied to interface blocks");
6433 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6436 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6437 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6438 "readonly and writeonly.");
6441 foreach_list_typed (ast_declaration
, decl
, link
,
6442 &decl_list
->declarations
) {
6443 YYLTYPE loc
= decl
->get_location();
6445 if (!allow_reserved_names
)
6446 validate_identifier(decl
->identifier
, loc
, state
);
6448 const struct glsl_type
*field_type
=
6449 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6450 validate_array_dimensions(field_type
, state
, &loc
);
6451 fields
[i
].type
= field_type
;
6452 fields
[i
].name
= decl
->identifier
;
6453 fields
[i
].interpolation
=
6454 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
6455 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6456 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6457 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6458 fields
[i
].precision
= qual
->precision
;
6460 if (qual
->flags
.q
.explicit_location
) {
6461 unsigned qual_location
;
6462 if (process_qualifier_constant(state
, &loc
, "location",
6463 qual
->location
, &qual_location
)) {
6464 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6465 expl_location
= fields
[i
].location
+
6466 fields
[i
].type
->count_attribute_slots(false);
6469 if (layout
&& layout
->flags
.q
.explicit_location
) {
6470 fields
[i
].location
= expl_location
;
6471 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6473 fields
[i
].location
= -1;
6477 /* Offset can only be used with std430 and std140 layouts an initial
6478 * value of 0 is used for error detection.
6484 if (qual
->flags
.q
.row_major
||
6485 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6491 if(layout
->flags
.q
.std140
) {
6492 align
= field_type
->std140_base_alignment(row_major
);
6493 size
= field_type
->std140_size(row_major
);
6494 } else if (layout
->flags
.q
.std430
) {
6495 align
= field_type
->std430_base_alignment(row_major
);
6496 size
= field_type
->std430_size(row_major
);
6500 if (qual
->flags
.q
.explicit_offset
) {
6501 unsigned qual_offset
;
6502 if (process_qualifier_constant(state
, &loc
, "offset",
6503 qual
->offset
, &qual_offset
)) {
6504 if (align
!= 0 && size
!= 0) {
6505 if (next_offset
> qual_offset
)
6506 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6507 "offset overlaps previous member");
6509 if (qual_offset
% align
) {
6510 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6511 "must be a multiple of the base "
6512 "alignment of %s", field_type
->name
);
6514 fields
[i
].offset
= qual_offset
;
6515 next_offset
= glsl_align(qual_offset
+ size
, align
);
6517 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6518 "with std430 and std140 layouts");
6522 fields
[i
].offset
= -1;
6525 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6526 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6528 if (align
== 0 || size
== 0) {
6529 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6530 "std430 and std140 layouts");
6531 } else if (qual
->flags
.q
.explicit_align
) {
6532 unsigned member_align
;
6533 if (process_qualifier_constant(state
, &loc
, "align",
6534 qual
->align
, &member_align
)) {
6535 if (member_align
== 0 ||
6536 member_align
& (member_align
- 1)) {
6537 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6538 "in not a power of 2");
6540 fields
[i
].offset
= glsl_align(offset
, member_align
);
6541 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6545 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6546 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6550 if (!qual
->flags
.q
.explicit_offset
) {
6551 if (align
!= 0 && size
!= 0)
6552 next_offset
= glsl_align(next_offset
+ size
, align
);
6555 /* Propogate row- / column-major information down the fields of the
6556 * structure or interface block. Structures need this data because
6557 * the structure may contain a structure that contains ... a matrix
6558 * that need the proper layout.
6561 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6562 (field_type
->without_array()->is_matrix()
6563 || field_type
->without_array()->is_record())) {
6564 /* If no layout is specified for the field, inherit the layout
6567 fields
[i
].matrix_layout
= matrix_layout
;
6569 if (qual
->flags
.q
.row_major
)
6570 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6571 else if (qual
->flags
.q
.column_major
)
6572 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6574 /* If we're processing an uniform or buffer block, the matrix
6575 * layout must be decided by this point.
6577 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6578 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6581 /* Image qualifiers are allowed on buffer variables, which can only
6582 * be defined inside shader storage buffer objects
6584 if (layout
&& var_mode
== ir_var_shader_storage
) {
6585 /* For readonly and writeonly qualifiers the field definition,
6586 * if set, overwrites the layout qualifier.
6588 if (qual
->flags
.q
.read_only
) {
6589 fields
[i
].image_read_only
= true;
6590 fields
[i
].image_write_only
= false;
6591 } else if (qual
->flags
.q
.write_only
) {
6592 fields
[i
].image_read_only
= false;
6593 fields
[i
].image_write_only
= true;
6595 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6596 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6599 /* For other qualifiers, we set the flag if either the layout
6600 * qualifier or the field qualifier are set
6602 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6603 layout
->flags
.q
.coherent
;
6604 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6605 layout
->flags
.q
._volatile
;
6606 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6607 layout
->flags
.q
.restrict_flag
;
6614 assert(i
== decl_count
);
6616 *fields_ret
= fields
;
6622 ast_struct_specifier::hir(exec_list
*instructions
,
6623 struct _mesa_glsl_parse_state
*state
)
6625 YYLTYPE loc
= this->get_location();
6627 unsigned expl_location
= 0;
6628 if (layout
&& layout
->flags
.q
.explicit_location
) {
6629 if (!process_qualifier_constant(state
, &loc
, "location",
6630 layout
->location
, &expl_location
)) {
6633 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6637 glsl_struct_field
*fields
;
6638 unsigned decl_count
=
6639 ast_process_struct_or_iface_block_members(instructions
,
6641 &this->declarations
,
6644 GLSL_MATRIX_LAYOUT_INHERITED
,
6645 false /* allow_reserved_names */,
6648 0, /* for interface only */
6650 0 /* for interface only */);
6652 validate_identifier(this->name
, loc
, state
);
6654 const glsl_type
*t
=
6655 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6657 if (!state
->symbols
->add_type(name
, t
)) {
6658 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6660 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6662 state
->num_user_structures
+ 1);
6664 s
[state
->num_user_structures
] = t
;
6665 state
->user_structures
= s
;
6666 state
->num_user_structures
++;
6670 /* Structure type definitions do not have r-values.
6677 * Visitor class which detects whether a given interface block has been used.
6679 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6682 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6683 : mode(mode
), block(block
), found(false)
6687 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6689 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6693 return visit_continue
;
6696 bool usage_found() const
6702 ir_variable_mode mode
;
6703 const glsl_type
*block
;
6708 is_unsized_array_last_element(ir_variable
*v
)
6710 const glsl_type
*interface_type
= v
->get_interface_type();
6711 int length
= interface_type
->length
;
6713 assert(v
->type
->is_unsized_array());
6715 /* Check if it is the last element of the interface */
6716 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6722 ast_interface_block::hir(exec_list
*instructions
,
6723 struct _mesa_glsl_parse_state
*state
)
6725 YYLTYPE loc
= this->get_location();
6727 /* Interface blocks must be declared at global scope */
6728 if (state
->current_function
!= NULL
) {
6729 _mesa_glsl_error(&loc
, state
,
6730 "Interface block `%s' must be declared "
6735 if (!this->layout
.flags
.q
.buffer
&&
6736 this->layout
.flags
.q
.std430
) {
6737 _mesa_glsl_error(&loc
, state
,
6738 "std430 storage block layout qualifier is supported "
6739 "only for shader storage blocks");
6742 /* The ast_interface_block has a list of ast_declarator_lists. We
6743 * need to turn those into ir_variables with an association
6744 * with this uniform block.
6746 enum glsl_interface_packing packing
;
6747 if (this->layout
.flags
.q
.shared
) {
6748 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6749 } else if (this->layout
.flags
.q
.packed
) {
6750 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6751 } else if (this->layout
.flags
.q
.std430
) {
6752 packing
= GLSL_INTERFACE_PACKING_STD430
;
6754 /* The default layout is std140.
6756 packing
= GLSL_INTERFACE_PACKING_STD140
;
6759 ir_variable_mode var_mode
;
6760 const char *iface_type_name
;
6761 if (this->layout
.flags
.q
.in
) {
6762 var_mode
= ir_var_shader_in
;
6763 iface_type_name
= "in";
6764 } else if (this->layout
.flags
.q
.out
) {
6765 var_mode
= ir_var_shader_out
;
6766 iface_type_name
= "out";
6767 } else if (this->layout
.flags
.q
.uniform
) {
6768 var_mode
= ir_var_uniform
;
6769 iface_type_name
= "uniform";
6770 } else if (this->layout
.flags
.q
.buffer
) {
6771 var_mode
= ir_var_shader_storage
;
6772 iface_type_name
= "buffer";
6774 var_mode
= ir_var_auto
;
6775 iface_type_name
= "UNKNOWN";
6776 assert(!"interface block layout qualifier not found!");
6779 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6780 if (this->layout
.flags
.q
.row_major
)
6781 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6782 else if (this->layout
.flags
.q
.column_major
)
6783 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6785 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6786 exec_list declared_variables
;
6787 glsl_struct_field
*fields
;
6789 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
6790 * that we don't have incompatible qualifiers
6792 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
6793 _mesa_glsl_error(&loc
, state
,
6794 "Interface block sets both readonly and writeonly");
6797 unsigned qual_stream
;
6798 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
6800 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
6801 /* If the stream qualifier is invalid it doesn't make sense to continue
6802 * on and try to compare stream layouts on member variables against it
6803 * so just return early.
6808 unsigned expl_location
= 0;
6809 if (layout
.flags
.q
.explicit_location
) {
6810 if (!process_qualifier_constant(state
, &loc
, "location",
6811 layout
.location
, &expl_location
)) {
6814 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6818 unsigned expl_align
= 0;
6819 if (layout
.flags
.q
.explicit_align
) {
6820 if (!process_qualifier_constant(state
, &loc
, "align",
6821 layout
.align
, &expl_align
)) {
6824 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
6825 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
6832 unsigned int num_variables
=
6833 ast_process_struct_or_iface_block_members(&declared_variables
,
6835 &this->declarations
,
6839 redeclaring_per_vertex
,
6846 if (!redeclaring_per_vertex
) {
6847 validate_identifier(this->block_name
, loc
, state
);
6849 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6851 * "Block names have no other use within a shader beyond interface
6852 * matching; it is a compile-time error to use a block name at global
6853 * scope for anything other than as a block name."
6855 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6856 if (var
&& !var
->type
->is_interface()) {
6857 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6858 "already used in the scope.",
6863 const glsl_type
*earlier_per_vertex
= NULL
;
6864 if (redeclaring_per_vertex
) {
6865 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6866 * the named interface block gl_in, we can find it by looking at the
6867 * previous declaration of gl_in. Otherwise we can find it by looking
6868 * at the previous decalartion of any of the built-in outputs,
6871 * Also check that the instance name and array-ness of the redeclaration
6875 case ir_var_shader_in
:
6876 if (ir_variable
*earlier_gl_in
=
6877 state
->symbols
->get_variable("gl_in")) {
6878 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6880 _mesa_glsl_error(&loc
, state
,
6881 "redeclaration of gl_PerVertex input not allowed "
6883 _mesa_shader_stage_to_string(state
->stage
));
6885 if (this->instance_name
== NULL
||
6886 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
6887 !this->array_specifier
->is_single_dimension()) {
6888 _mesa_glsl_error(&loc
, state
,
6889 "gl_PerVertex input must be redeclared as "
6893 case ir_var_shader_out
:
6894 if (ir_variable
*earlier_gl_Position
=
6895 state
->symbols
->get_variable("gl_Position")) {
6896 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6897 } else if (ir_variable
*earlier_gl_out
=
6898 state
->symbols
->get_variable("gl_out")) {
6899 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6901 _mesa_glsl_error(&loc
, state
,
6902 "redeclaration of gl_PerVertex output not "
6903 "allowed in the %s shader",
6904 _mesa_shader_stage_to_string(state
->stage
));
6906 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6907 if (this->instance_name
== NULL
||
6908 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6909 _mesa_glsl_error(&loc
, state
,
6910 "gl_PerVertex output must be redeclared as "
6914 if (this->instance_name
!= NULL
) {
6915 _mesa_glsl_error(&loc
, state
,
6916 "gl_PerVertex output may not be redeclared with "
6917 "an instance name");
6922 _mesa_glsl_error(&loc
, state
,
6923 "gl_PerVertex must be declared as an input or an "
6928 if (earlier_per_vertex
== NULL
) {
6929 /* An error has already been reported. Bail out to avoid null
6930 * dereferences later in this function.
6935 /* Copy locations from the old gl_PerVertex interface block. */
6936 for (unsigned i
= 0; i
< num_variables
; i
++) {
6937 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6939 _mesa_glsl_error(&loc
, state
,
6940 "redeclaration of gl_PerVertex must be a subset "
6941 "of the built-in members of gl_PerVertex");
6943 fields
[i
].location
=
6944 earlier_per_vertex
->fields
.structure
[j
].location
;
6946 earlier_per_vertex
->fields
.structure
[j
].offset
;
6947 fields
[i
].interpolation
=
6948 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6949 fields
[i
].centroid
=
6950 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6952 earlier_per_vertex
->fields
.structure
[j
].sample
;
6954 earlier_per_vertex
->fields
.structure
[j
].patch
;
6955 fields
[i
].precision
=
6956 earlier_per_vertex
->fields
.structure
[j
].precision
;
6960 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6963 * If a built-in interface block is redeclared, it must appear in
6964 * the shader before any use of any member included in the built-in
6965 * declaration, or a compilation error will result.
6967 * This appears to be a clarification to the behaviour established for
6968 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6969 * regardless of GLSL version.
6971 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6972 v
.run(instructions
);
6973 if (v
.usage_found()) {
6974 _mesa_glsl_error(&loc
, state
,
6975 "redeclaration of a built-in interface block must "
6976 "appear before any use of any member of the "
6981 const glsl_type
*block_type
=
6982 glsl_type::get_interface_instance(fields
,
6987 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6988 YYLTYPE loc
= this->get_location();
6989 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6990 "already taken in the current scope",
6991 this->block_name
, iface_type_name
);
6994 /* Since interface blocks cannot contain statements, it should be
6995 * impossible for the block to generate any instructions.
6997 assert(declared_variables
.is_empty());
6999 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7001 * Geometry shader input variables get the per-vertex values written
7002 * out by vertex shader output variables of the same names. Since a
7003 * geometry shader operates on a set of vertices, each input varying
7004 * variable (or input block, see interface blocks below) needs to be
7005 * declared as an array.
7007 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7008 var_mode
== ir_var_shader_in
) {
7009 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7010 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7011 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7012 this->array_specifier
== NULL
&&
7013 var_mode
== ir_var_shader_in
) {
7014 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7015 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7016 this->array_specifier
== NULL
&&
7017 var_mode
== ir_var_shader_out
) {
7018 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7022 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7025 * "If an instance name (instance-name) is used, then it puts all the
7026 * members inside a scope within its own name space, accessed with the
7027 * field selector ( . ) operator (analogously to structures)."
7029 if (this->instance_name
) {
7030 if (redeclaring_per_vertex
) {
7031 /* When a built-in in an unnamed interface block is redeclared,
7032 * get_variable_being_redeclared() calls
7033 * check_builtin_array_max_size() to make sure that built-in array
7034 * variables aren't redeclared to illegal sizes. But we're looking
7035 * at a redeclaration of a named built-in interface block. So we
7036 * have to manually call check_builtin_array_max_size() for all parts
7037 * of the interface that are arrays.
7039 for (unsigned i
= 0; i
< num_variables
; i
++) {
7040 if (fields
[i
].type
->is_array()) {
7041 const unsigned size
= fields
[i
].type
->array_size();
7042 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7046 validate_identifier(this->instance_name
, loc
, state
);
7051 if (this->array_specifier
!= NULL
) {
7052 const glsl_type
*block_array_type
=
7053 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7055 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7057 * For uniform blocks declared an array, each individual array
7058 * element corresponds to a separate buffer object backing one
7059 * instance of the block. As the array size indicates the number
7060 * of buffer objects needed, uniform block array declarations
7061 * must specify an array size.
7063 * And a few paragraphs later:
7065 * Geometry shader input blocks must be declared as arrays and
7066 * follow the array declaration and linking rules for all
7067 * geometry shader inputs. All other input and output block
7068 * arrays must specify an array size.
7070 * The same applies to tessellation shaders.
7072 * The upshot of this is that the only circumstance where an
7073 * interface array size *doesn't* need to be specified is on a
7074 * geometry shader input, tessellation control shader input,
7075 * tessellation control shader output, and tessellation evaluation
7078 if (block_array_type
->is_unsized_array()) {
7079 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7080 state
->stage
== MESA_SHADER_TESS_CTRL
||
7081 state
->stage
== MESA_SHADER_TESS_EVAL
;
7082 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7084 if (this->layout
.flags
.q
.in
) {
7086 _mesa_glsl_error(&loc
, state
,
7087 "unsized input block arrays not allowed in "
7089 _mesa_shader_stage_to_string(state
->stage
));
7090 } else if (this->layout
.flags
.q
.out
) {
7092 _mesa_glsl_error(&loc
, state
,
7093 "unsized output block arrays not allowed in "
7095 _mesa_shader_stage_to_string(state
->stage
));
7097 /* by elimination, this is a uniform block array */
7098 _mesa_glsl_error(&loc
, state
,
7099 "unsized uniform block arrays not allowed in "
7101 _mesa_shader_stage_to_string(state
->stage
));
7105 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7107 * * Arrays of arrays of blocks are not allowed
7109 if (state
->es_shader
&& block_array_type
->is_array() &&
7110 block_array_type
->fields
.array
->is_array()) {
7111 _mesa_glsl_error(&loc
, state
,
7112 "arrays of arrays interface blocks are "
7116 var
= new(state
) ir_variable(block_array_type
,
7117 this->instance_name
,
7120 var
= new(state
) ir_variable(block_type
,
7121 this->instance_name
,
7125 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7126 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7128 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7129 var
->data
.read_only
= true;
7131 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7132 handle_geometry_shader_input_decl(state
, loc
, var
);
7133 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7134 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7135 handle_tess_shader_input_decl(state
, loc
, var
);
7136 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7137 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7139 for (unsigned i
= 0; i
< num_variables
; i
++) {
7140 if (fields
[i
].type
->is_unsized_array()) {
7141 if (var_mode
== ir_var_shader_storage
) {
7142 if (i
!= (num_variables
- 1)) {
7143 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7144 "only last member of a shader storage block "
7145 "can be defined as unsized array",
7149 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7151 * "If an array is declared as the last member of a shader storage
7152 * block and the size is not specified at compile-time, it is
7153 * sized at run-time. In all other cases, arrays are sized only
7156 if (state
->es_shader
) {
7157 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7158 "only last member of a shader storage block "
7159 "can be defined as unsized array",
7166 if (ir_variable
*earlier
=
7167 state
->symbols
->get_variable(this->instance_name
)) {
7168 if (!redeclaring_per_vertex
) {
7169 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7170 this->instance_name
);
7172 earlier
->data
.how_declared
= ir_var_declared_normally
;
7173 earlier
->type
= var
->type
;
7174 earlier
->reinit_interface_type(block_type
);
7177 if (this->layout
.flags
.q
.explicit_binding
) {
7178 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7182 var
->data
.stream
= qual_stream
;
7183 if (layout
.flags
.q
.explicit_location
) {
7184 var
->data
.location
= expl_location
;
7185 var
->data
.explicit_location
= true;
7188 state
->symbols
->add_variable(var
);
7189 instructions
->push_tail(var
);
7192 /* In order to have an array size, the block must also be declared with
7195 assert(this->array_specifier
== NULL
);
7197 for (unsigned i
= 0; i
< num_variables
; i
++) {
7199 new(state
) ir_variable(fields
[i
].type
,
7200 ralloc_strdup(state
, fields
[i
].name
),
7202 var
->data
.interpolation
= fields
[i
].interpolation
;
7203 var
->data
.centroid
= fields
[i
].centroid
;
7204 var
->data
.sample
= fields
[i
].sample
;
7205 var
->data
.patch
= fields
[i
].patch
;
7206 var
->data
.stream
= qual_stream
;
7207 var
->data
.location
= fields
[i
].location
;
7208 if (fields
[i
].location
!= -1)
7209 var
->data
.explicit_location
= true;
7210 var
->init_interface_type(block_type
);
7212 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7213 var
->data
.read_only
= true;
7215 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7216 if (state
->es_shader
) {
7217 var
->data
.precision
=
7218 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7222 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7223 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7224 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7226 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7229 if (var
->data
.mode
== ir_var_shader_storage
) {
7230 var
->data
.image_read_only
= fields
[i
].image_read_only
;
7231 var
->data
.image_write_only
= fields
[i
].image_write_only
;
7232 var
->data
.image_coherent
= fields
[i
].image_coherent
;
7233 var
->data
.image_volatile
= fields
[i
].image_volatile
;
7234 var
->data
.image_restrict
= fields
[i
].image_restrict
;
7237 /* Examine var name here since var may get deleted in the next call */
7238 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7240 if (redeclaring_per_vertex
) {
7241 ir_variable
*earlier
=
7242 get_variable_being_redeclared(var
, loc
, state
,
7243 true /* allow_all_redeclarations */);
7244 if (!var_is_gl_id
|| earlier
== NULL
) {
7245 _mesa_glsl_error(&loc
, state
,
7246 "redeclaration of gl_PerVertex can only "
7247 "include built-in variables");
7248 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7249 _mesa_glsl_error(&loc
, state
,
7250 "`%s' has already been redeclared",
7253 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7254 earlier
->reinit_interface_type(block_type
);
7259 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7260 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7262 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7263 * The UBO declaration itself doesn't get an ir_variable unless it
7264 * has an instance name. This is ugly.
7266 if (this->layout
.flags
.q
.explicit_binding
) {
7267 apply_explicit_binding(state
, &loc
, var
,
7268 var
->get_interface_type(), &this->layout
);
7271 if (var
->type
->is_unsized_array()) {
7272 if (var
->is_in_shader_storage_block()) {
7273 if (!is_unsized_array_last_element(var
)) {
7274 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7275 "only last member of a shader storage block "
7276 "can be defined as unsized array",
7279 var
->data
.from_ssbo_unsized_array
= true;
7281 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7283 * "If an array is declared as the last member of a shader storage
7284 * block and the size is not specified at compile-time, it is
7285 * sized at run-time. In all other cases, arrays are sized only
7288 if (state
->es_shader
) {
7289 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7290 "only last member of a shader storage block "
7291 "can be defined as unsized array",
7297 state
->symbols
->add_variable(var
);
7298 instructions
->push_tail(var
);
7301 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7302 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7304 * It is also a compilation error ... to redeclare a built-in
7305 * block and then use a member from that built-in block that was
7306 * not included in the redeclaration.
7308 * This appears to be a clarification to the behaviour established
7309 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7310 * behaviour regardless of GLSL version.
7312 * To prevent the shader from using a member that was not included in
7313 * the redeclaration, we disable any ir_variables that are still
7314 * associated with the old declaration of gl_PerVertex (since we've
7315 * already updated all of the variables contained in the new
7316 * gl_PerVertex to point to it).
7318 * As a side effect this will prevent
7319 * validate_intrastage_interface_blocks() from getting confused and
7320 * thinking there are conflicting definitions of gl_PerVertex in the
7323 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7324 ir_variable
*const var
= node
->as_variable();
7326 var
->get_interface_type() == earlier_per_vertex
&&
7327 var
->data
.mode
== var_mode
) {
7328 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7329 _mesa_glsl_error(&loc
, state
,
7330 "redeclaration of gl_PerVertex cannot "
7331 "follow a redeclaration of `%s'",
7334 state
->symbols
->disable_variable(var
->name
);
7346 ast_tcs_output_layout::hir(exec_list
*instructions
,
7347 struct _mesa_glsl_parse_state
*state
)
7349 YYLTYPE loc
= this->get_location();
7351 unsigned num_vertices
;
7352 if (!state
->out_qualifier
->vertices
->
7353 process_qualifier_constant(state
, "vertices", &num_vertices
,
7355 /* return here to stop cascading incorrect error messages */
7359 /* If any shader outputs occurred before this declaration and specified an
7360 * array size, make sure the size they specified is consistent with the
7363 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7364 _mesa_glsl_error(&loc
, state
,
7365 "this tessellation control shader output layout "
7366 "specifies %u vertices, but a previous output "
7367 "is declared with size %u",
7368 num_vertices
, state
->tcs_output_size
);
7372 state
->tcs_output_vertices_specified
= true;
7374 /* If any shader outputs occurred before this declaration and did not
7375 * specify an array size, their size is determined now.
7377 foreach_in_list (ir_instruction
, node
, instructions
) {
7378 ir_variable
*var
= node
->as_variable();
7379 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7382 /* Note: Not all tessellation control shader output are arrays. */
7383 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7386 if (var
->data
.max_array_access
>= num_vertices
) {
7387 _mesa_glsl_error(&loc
, state
,
7388 "this tessellation control shader output layout "
7389 "specifies %u vertices, but an access to element "
7390 "%u of output `%s' already exists", num_vertices
,
7391 var
->data
.max_array_access
, var
->name
);
7393 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7403 ast_gs_input_layout::hir(exec_list
*instructions
,
7404 struct _mesa_glsl_parse_state
*state
)
7406 YYLTYPE loc
= this->get_location();
7408 /* If any geometry input layout declaration preceded this one, make sure it
7409 * was consistent with this one.
7411 if (state
->gs_input_prim_type_specified
&&
7412 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7413 _mesa_glsl_error(&loc
, state
,
7414 "geometry shader input layout does not match"
7415 " previous declaration");
7419 /* If any shader inputs occurred before this declaration and specified an
7420 * array size, make sure the size they specified is consistent with the
7423 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7424 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7425 _mesa_glsl_error(&loc
, state
,
7426 "this geometry shader input layout implies %u vertices"
7427 " per primitive, but a previous input is declared"
7428 " with size %u", num_vertices
, state
->gs_input_size
);
7432 state
->gs_input_prim_type_specified
= true;
7434 /* If any shader inputs occurred before this declaration and did not
7435 * specify an array size, their size is determined now.
7437 foreach_in_list(ir_instruction
, node
, instructions
) {
7438 ir_variable
*var
= node
->as_variable();
7439 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7442 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7446 if (var
->type
->is_unsized_array()) {
7447 if (var
->data
.max_array_access
>= num_vertices
) {
7448 _mesa_glsl_error(&loc
, state
,
7449 "this geometry shader input layout implies %u"
7450 " vertices, but an access to element %u of input"
7451 " `%s' already exists", num_vertices
,
7452 var
->data
.max_array_access
, var
->name
);
7454 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7465 ast_cs_input_layout::hir(exec_list
*instructions
,
7466 struct _mesa_glsl_parse_state
*state
)
7468 YYLTYPE loc
= this->get_location();
7470 /* From the ARB_compute_shader specification:
7472 * If the local size of the shader in any dimension is greater
7473 * than the maximum size supported by the implementation for that
7474 * dimension, a compile-time error results.
7476 * It is not clear from the spec how the error should be reported if
7477 * the total size of the work group exceeds
7478 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7479 * report it at compile time as well.
7481 GLuint64 total_invocations
= 1;
7482 unsigned qual_local_size
[3];
7483 for (int i
= 0; i
< 3; i
++) {
7485 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7487 /* Infer a local_size of 1 for unspecified dimensions */
7488 if (this->local_size
[i
] == NULL
) {
7489 qual_local_size
[i
] = 1;
7490 } else if (!this->local_size
[i
]->
7491 process_qualifier_constant(state
, local_size_str
,
7492 &qual_local_size
[i
], false)) {
7493 ralloc_free(local_size_str
);
7496 ralloc_free(local_size_str
);
7498 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7499 _mesa_glsl_error(&loc
, state
,
7500 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7502 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7505 total_invocations
*= qual_local_size
[i
];
7506 if (total_invocations
>
7507 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7508 _mesa_glsl_error(&loc
, state
,
7509 "product of local_sizes exceeds "
7510 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7511 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7516 /* If any compute input layout declaration preceded this one, make sure it
7517 * was consistent with this one.
7519 if (state
->cs_input_local_size_specified
) {
7520 for (int i
= 0; i
< 3; i
++) {
7521 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7522 _mesa_glsl_error(&loc
, state
,
7523 "compute shader input layout does not match"
7524 " previous declaration");
7530 state
->cs_input_local_size_specified
= true;
7531 for (int i
= 0; i
< 3; i
++)
7532 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7534 /* We may now declare the built-in constant gl_WorkGroupSize (see
7535 * builtin_variable_generator::generate_constants() for why we didn't
7536 * declare it earlier).
7538 ir_variable
*var
= new(state
->symbols
)
7539 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7540 var
->data
.how_declared
= ir_var_declared_implicitly
;
7541 var
->data
.read_only
= true;
7542 instructions
->push_tail(var
);
7543 state
->symbols
->add_variable(var
);
7544 ir_constant_data data
;
7545 memset(&data
, 0, sizeof(data
));
7546 for (int i
= 0; i
< 3; i
++)
7547 data
.u
[i
] = qual_local_size
[i
];
7548 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7549 var
->constant_initializer
=
7550 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7551 var
->data
.has_initializer
= true;
7558 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7559 exec_list
*instructions
)
7561 bool gl_FragColor_assigned
= false;
7562 bool gl_FragData_assigned
= false;
7563 bool gl_FragSecondaryColor_assigned
= false;
7564 bool gl_FragSecondaryData_assigned
= false;
7565 bool user_defined_fs_output_assigned
= false;
7566 ir_variable
*user_defined_fs_output
= NULL
;
7568 /* It would be nice to have proper location information. */
7570 memset(&loc
, 0, sizeof(loc
));
7572 foreach_in_list(ir_instruction
, node
, instructions
) {
7573 ir_variable
*var
= node
->as_variable();
7575 if (!var
|| !var
->data
.assigned
)
7578 if (strcmp(var
->name
, "gl_FragColor") == 0)
7579 gl_FragColor_assigned
= true;
7580 else if (strcmp(var
->name
, "gl_FragData") == 0)
7581 gl_FragData_assigned
= true;
7582 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7583 gl_FragSecondaryColor_assigned
= true;
7584 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7585 gl_FragSecondaryData_assigned
= true;
7586 else if (!is_gl_identifier(var
->name
)) {
7587 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7588 var
->data
.mode
== ir_var_shader_out
) {
7589 user_defined_fs_output_assigned
= true;
7590 user_defined_fs_output
= var
;
7595 /* From the GLSL 1.30 spec:
7597 * "If a shader statically assigns a value to gl_FragColor, it
7598 * may not assign a value to any element of gl_FragData. If a
7599 * shader statically writes a value to any element of
7600 * gl_FragData, it may not assign a value to
7601 * gl_FragColor. That is, a shader may assign values to either
7602 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7603 * linked together must also consistently write just one of
7604 * these variables. Similarly, if user declared output
7605 * variables are in use (statically assigned to), then the
7606 * built-in variables gl_FragColor and gl_FragData may not be
7607 * assigned to. These incorrect usages all generate compile
7610 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7611 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7612 "`gl_FragColor' and `gl_FragData'");
7613 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7614 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7615 "`gl_FragColor' and `%s'",
7616 user_defined_fs_output
->name
);
7617 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7618 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7619 "`gl_FragSecondaryColorEXT' and"
7620 " `gl_FragSecondaryDataEXT'");
7621 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7622 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7623 "`gl_FragColor' and"
7624 " `gl_FragSecondaryDataEXT'");
7625 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7626 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7628 " `gl_FragSecondaryColorEXT'");
7629 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7630 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7631 "`gl_FragData' and `%s'",
7632 user_defined_fs_output
->name
);
7635 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7636 !state
->EXT_blend_func_extended_enable
) {
7637 _mesa_glsl_error(&loc
, state
,
7638 "Dual source blending requires EXT_blend_func_extended");
7644 remove_per_vertex_blocks(exec_list
*instructions
,
7645 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7647 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7648 * if it exists in this shader type.
7650 const glsl_type
*per_vertex
= NULL
;
7652 case ir_var_shader_in
:
7653 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7654 per_vertex
= gl_in
->get_interface_type();
7656 case ir_var_shader_out
:
7657 if (ir_variable
*gl_Position
=
7658 state
->symbols
->get_variable("gl_Position")) {
7659 per_vertex
= gl_Position
->get_interface_type();
7663 assert(!"Unexpected mode");
7667 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7668 * need to do anything.
7670 if (per_vertex
== NULL
)
7673 /* If the interface block is used by the shader, then we don't need to do
7676 interface_block_usage_visitor
v(mode
, per_vertex
);
7677 v
.run(instructions
);
7678 if (v
.usage_found())
7681 /* Remove any ir_variable declarations that refer to the interface block
7684 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7685 ir_variable
*const var
= node
->as_variable();
7686 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
7687 var
->data
.mode
== mode
) {
7688 state
->symbols
->disable_variable(var
->name
);