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_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 case GLSL_TYPE_DOUBLE
: return ir_unop_d2f
;
243 default: return (ir_expression_operation
)0;
247 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
)
248 return (ir_expression_operation
)0;
249 switch (from
->base_type
) {
250 case GLSL_TYPE_INT
: return ir_unop_i2u
;
251 default: return (ir_expression_operation
)0;
254 case GLSL_TYPE_DOUBLE
:
255 if (!state
->has_double())
256 return (ir_expression_operation
)0;
257 switch (from
->base_type
) {
258 case GLSL_TYPE_INT
: return ir_unop_i2d
;
259 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
260 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
261 default: return (ir_expression_operation
)0;
264 default: return (ir_expression_operation
)0;
270 * If a conversion is available, convert one operand to a different type
272 * The \c from \c ir_rvalue is converted "in place".
274 * \param to Type that the operand it to be converted to
275 * \param from Operand that is being converted
276 * \param state GLSL compiler state
279 * If a conversion is possible (or unnecessary), \c true is returned.
280 * Otherwise \c false is returned.
283 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
284 struct _mesa_glsl_parse_state
*state
)
287 if (to
->base_type
== from
->type
->base_type
)
290 /* Prior to GLSL 1.20, there are no implicit conversions */
291 if (!state
->is_version(120, 0))
294 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
296 * "There are no implicit array or structure conversions. For
297 * example, an array of int cannot be implicitly converted to an
300 if (!to
->is_numeric() || !from
->type
->is_numeric())
303 /* We don't actually want the specific type `to`, we want a type
304 * with the same base type as `to`, but the same vector width as
307 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
308 from
->type
->matrix_columns
);
310 ir_expression_operation op
= get_conversion_operation(to
, from
->type
, state
);
312 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
320 static const struct glsl_type
*
321 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
323 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
325 const glsl_type
*type_a
= value_a
->type
;
326 const glsl_type
*type_b
= value_b
->type
;
328 /* From GLSL 1.50 spec, page 56:
330 * "The arithmetic binary operators add (+), subtract (-),
331 * multiply (*), and divide (/) operate on integer and
332 * floating-point scalars, vectors, and matrices."
334 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
335 _mesa_glsl_error(loc
, state
,
336 "operands to arithmetic operators must be numeric");
337 return glsl_type::error_type
;
341 /* "If one operand is floating-point based and the other is
342 * not, then the conversions from Section 4.1.10 "Implicit
343 * Conversions" are applied to the non-floating-point-based operand."
345 if (!apply_implicit_conversion(type_a
, value_b
, state
)
346 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
347 _mesa_glsl_error(loc
, state
,
348 "could not implicitly convert operands to "
349 "arithmetic operator");
350 return glsl_type::error_type
;
352 type_a
= value_a
->type
;
353 type_b
= value_b
->type
;
355 /* "If the operands are integer types, they must both be signed or
358 * From this rule and the preceeding conversion it can be inferred that
359 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
360 * The is_numeric check above already filtered out the case where either
361 * type is not one of these, so now the base types need only be tested for
364 if (type_a
->base_type
!= type_b
->base_type
) {
365 _mesa_glsl_error(loc
, state
,
366 "base type mismatch for arithmetic operator");
367 return glsl_type::error_type
;
370 /* "All arithmetic binary operators result in the same fundamental type
371 * (signed integer, unsigned integer, or floating-point) as the
372 * operands they operate on, after operand type conversion. After
373 * conversion, the following cases are valid
375 * * The two operands are scalars. In this case the operation is
376 * applied, resulting in a scalar."
378 if (type_a
->is_scalar() && type_b
->is_scalar())
381 /* "* One operand is a scalar, and the other is a vector or matrix.
382 * In this case, the scalar operation is applied independently to each
383 * component of the vector or matrix, resulting in the same size
386 if (type_a
->is_scalar()) {
387 if (!type_b
->is_scalar())
389 } else if (type_b
->is_scalar()) {
393 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
394 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
397 assert(!type_a
->is_scalar());
398 assert(!type_b
->is_scalar());
400 /* "* The two operands are vectors of the same size. In this case, the
401 * operation is done component-wise resulting in the same size
404 if (type_a
->is_vector() && type_b
->is_vector()) {
405 if (type_a
== type_b
) {
408 _mesa_glsl_error(loc
, state
,
409 "vector size mismatch for arithmetic operator");
410 return glsl_type::error_type
;
414 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
415 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
416 * <vector, vector> have been handled. At least one of the operands must
417 * be matrix. Further, since there are no integer matrix types, the base
418 * type of both operands must be float.
420 assert(type_a
->is_matrix() || type_b
->is_matrix());
421 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
422 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
423 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
424 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
426 /* "* The operator is add (+), subtract (-), or divide (/), and the
427 * operands are matrices with the same number of rows and the same
428 * number of columns. In this case, the operation is done component-
429 * wise resulting in the same size matrix."
430 * * The operator is multiply (*), where both operands are matrices or
431 * one operand is a vector and the other a matrix. A right vector
432 * operand is treated as a column vector and a left vector operand as a
433 * row vector. In all these cases, it is required that the number of
434 * columns of the left operand is equal to the number of rows of the
435 * right operand. Then, the multiply (*) operation does a linear
436 * algebraic multiply, yielding an object that has the same number of
437 * rows as the left operand and the same number of columns as the right
438 * operand. Section 5.10 "Vector and Matrix Operations" explains in
439 * more detail how vectors and matrices are operated on."
442 if (type_a
== type_b
)
445 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
447 if (type
== glsl_type::error_type
) {
448 _mesa_glsl_error(loc
, state
,
449 "size mismatch for matrix multiplication");
456 /* "All other cases are illegal."
458 _mesa_glsl_error(loc
, state
, "type mismatch");
459 return glsl_type::error_type
;
463 static const struct glsl_type
*
464 unary_arithmetic_result_type(const struct glsl_type
*type
,
465 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
467 /* From GLSL 1.50 spec, page 57:
469 * "The arithmetic unary operators negate (-), post- and pre-increment
470 * and decrement (-- and ++) operate on integer or floating-point
471 * values (including vectors and matrices). All unary operators work
472 * component-wise on their operands. These result with the same type
475 if (!type
->is_numeric()) {
476 _mesa_glsl_error(loc
, state
,
477 "operands to arithmetic operators must be numeric");
478 return glsl_type::error_type
;
485 * \brief Return the result type of a bit-logic operation.
487 * If the given types to the bit-logic operator are invalid, return
488 * glsl_type::error_type.
490 * \param value_a LHS of bit-logic op
491 * \param value_b RHS of bit-logic op
493 static const struct glsl_type
*
494 bit_logic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
496 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
498 const glsl_type
*type_a
= value_a
->type
;
499 const glsl_type
*type_b
= value_b
->type
;
501 if (!state
->check_bitwise_operations_allowed(loc
)) {
502 return glsl_type::error_type
;
505 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
507 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
508 * (|). The operands must be of type signed or unsigned integers or
511 if (!type_a
->is_integer()) {
512 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
513 ast_expression::operator_string(op
));
514 return glsl_type::error_type
;
516 if (!type_b
->is_integer()) {
517 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
518 ast_expression::operator_string(op
));
519 return glsl_type::error_type
;
522 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
523 * make sense for bitwise operations, as they don't operate on floats.
525 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
526 * here. It wasn't clear whether or not we should apply them to bitwise
527 * operations. However, Khronos has decided that they should in future
528 * language revisions. Applications also rely on this behavior. We opt
529 * to apply them in general, but issue a portability warning.
531 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
533 if (type_a
->base_type
!= type_b
->base_type
) {
534 if (!apply_implicit_conversion(type_a
, value_b
, state
)
535 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
536 _mesa_glsl_error(loc
, state
,
537 "could not implicitly convert operands to "
539 ast_expression::operator_string(op
));
540 return glsl_type::error_type
;
542 _mesa_glsl_warning(loc
, state
,
543 "some implementations may not support implicit "
544 "int -> uint conversions for `%s' operators; "
545 "consider casting explicitly for portability",
546 ast_expression::operator_string(op
));
548 type_a
= value_a
->type
;
549 type_b
= value_b
->type
;
552 /* "The fundamental types of the operands (signed or unsigned) must
555 if (type_a
->base_type
!= type_b
->base_type
) {
556 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
557 "base type", ast_expression::operator_string(op
));
558 return glsl_type::error_type
;
561 /* "The operands cannot be vectors of differing size." */
562 if (type_a
->is_vector() &&
563 type_b
->is_vector() &&
564 type_a
->vector_elements
!= type_b
->vector_elements
) {
565 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
566 "different sizes", ast_expression::operator_string(op
));
567 return glsl_type::error_type
;
570 /* "If one operand is a scalar and the other a vector, the scalar is
571 * applied component-wise to the vector, resulting in the same type as
572 * the vector. The fundamental types of the operands [...] will be the
573 * resulting fundamental type."
575 if (type_a
->is_scalar())
581 static const struct glsl_type
*
582 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
583 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
585 const glsl_type
*type_a
= value_a
->type
;
586 const glsl_type
*type_b
= value_b
->type
;
588 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
589 return glsl_type::error_type
;
592 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
594 * "The operator modulus (%) operates on signed or unsigned integers or
597 if (!type_a
->is_integer()) {
598 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
599 return glsl_type::error_type
;
601 if (!type_b
->is_integer()) {
602 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
603 return glsl_type::error_type
;
606 /* "If the fundamental types in the operands do not match, then the
607 * conversions from section 4.1.10 "Implicit Conversions" are applied
608 * to create matching types."
610 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
611 * int -> uint conversion rules. Prior to that, there were no implicit
612 * conversions. So it's harmless to apply them universally - no implicit
613 * conversions will exist. If the types don't match, we'll receive false,
614 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
616 * "The operand types must both be signed or unsigned."
618 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
619 !apply_implicit_conversion(type_b
, value_a
, state
)) {
620 _mesa_glsl_error(loc
, state
,
621 "could not implicitly convert operands to "
622 "modulus (%%) operator");
623 return glsl_type::error_type
;
625 type_a
= value_a
->type
;
626 type_b
= value_b
->type
;
628 /* "The operands cannot be vectors of differing size. If one operand is
629 * a scalar and the other vector, then the scalar is applied component-
630 * wise to the vector, resulting in the same type as the vector. If both
631 * are vectors of the same size, the result is computed component-wise."
633 if (type_a
->is_vector()) {
634 if (!type_b
->is_vector()
635 || (type_a
->vector_elements
== type_b
->vector_elements
))
640 /* "The operator modulus (%) is not defined for any other data types
641 * (non-integer types)."
643 _mesa_glsl_error(loc
, state
, "type mismatch");
644 return glsl_type::error_type
;
648 static const struct glsl_type
*
649 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
650 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
652 const glsl_type
*type_a
= value_a
->type
;
653 const glsl_type
*type_b
= value_b
->type
;
655 /* From GLSL 1.50 spec, page 56:
656 * "The relational operators greater than (>), less than (<), greater
657 * than or equal (>=), and less than or equal (<=) operate only on
658 * scalar integer and scalar floating-point expressions."
660 if (!type_a
->is_numeric()
661 || !type_b
->is_numeric()
662 || !type_a
->is_scalar()
663 || !type_b
->is_scalar()) {
664 _mesa_glsl_error(loc
, state
,
665 "operands to relational operators must be scalar and "
667 return glsl_type::error_type
;
670 /* "Either the operands' types must match, or the conversions from
671 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
672 * operand, after which the types must match."
674 if (!apply_implicit_conversion(type_a
, value_b
, state
)
675 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
676 _mesa_glsl_error(loc
, state
,
677 "could not implicitly convert operands to "
678 "relational operator");
679 return glsl_type::error_type
;
681 type_a
= value_a
->type
;
682 type_b
= value_b
->type
;
684 if (type_a
->base_type
!= type_b
->base_type
) {
685 _mesa_glsl_error(loc
, state
, "base type mismatch");
686 return glsl_type::error_type
;
689 /* "The result is scalar Boolean."
691 return glsl_type::bool_type
;
695 * \brief Return the result type of a bit-shift operation.
697 * If the given types to the bit-shift operator are invalid, return
698 * glsl_type::error_type.
700 * \param type_a Type of LHS of bit-shift op
701 * \param type_b Type of RHS of bit-shift op
703 static const struct glsl_type
*
704 shift_result_type(const struct glsl_type
*type_a
,
705 const struct glsl_type
*type_b
,
707 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
709 if (!state
->check_bitwise_operations_allowed(loc
)) {
710 return glsl_type::error_type
;
713 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
715 * "The shift operators (<<) and (>>). For both operators, the operands
716 * must be signed or unsigned integers or integer vectors. One operand
717 * can be signed while the other is unsigned."
719 if (!type_a
->is_integer()) {
720 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
721 "integer vector", ast_expression::operator_string(op
));
722 return glsl_type::error_type
;
725 if (!type_b
->is_integer()) {
726 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
727 "integer vector", ast_expression::operator_string(op
));
728 return glsl_type::error_type
;
731 /* "If the first operand is a scalar, the second operand has to be
734 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
735 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
736 "second must be scalar as well",
737 ast_expression::operator_string(op
));
738 return glsl_type::error_type
;
741 /* If both operands are vectors, check that they have same number of
744 if (type_a
->is_vector() &&
745 type_b
->is_vector() &&
746 type_a
->vector_elements
!= type_b
->vector_elements
) {
747 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
748 "have same number of elements",
749 ast_expression::operator_string(op
));
750 return glsl_type::error_type
;
753 /* "In all cases, the resulting type will be the same type as the left
760 * Returns the innermost array index expression in an rvalue tree.
761 * This is the largest indexing level -- if an array of blocks, then
762 * it is the block index rather than an indexing expression for an
763 * array-typed member of an array of blocks.
766 find_innermost_array_index(ir_rvalue
*rv
)
768 ir_dereference_array
*last
= NULL
;
770 if (rv
->as_dereference_array()) {
771 last
= rv
->as_dereference_array();
773 } else if (rv
->as_dereference_record())
774 rv
= rv
->as_dereference_record()->record
;
775 else if (rv
->as_swizzle())
776 rv
= rv
->as_swizzle()->val
;
782 return last
->array_index
;
788 * Validates that a value can be assigned to a location with a specified type
790 * Validates that \c rhs can be assigned to some location. If the types are
791 * not an exact match but an automatic conversion is possible, \c rhs will be
795 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
796 * Otherwise the actual RHS to be assigned will be returned. This may be
797 * \c rhs, or it may be \c rhs after some type conversion.
800 * In addition to being used for assignments, this function is used to
801 * type-check return values.
804 validate_assignment(struct _mesa_glsl_parse_state
*state
,
805 YYLTYPE loc
, ir_rvalue
*lhs
,
806 ir_rvalue
*rhs
, bool is_initializer
)
808 /* If there is already some error in the RHS, just return it. Anything
809 * else will lead to an avalanche of error message back to the user.
811 if (rhs
->type
->is_error())
814 /* In the Tessellation Control Shader:
815 * If a per-vertex output variable is used as an l-value, it is an error
816 * if the expression indicating the vertex number is not the identifier
819 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
820 ir_variable
*var
= lhs
->variable_referenced();
821 if (var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
822 ir_rvalue
*index
= find_innermost_array_index(lhs
);
823 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
824 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
825 _mesa_glsl_error(&loc
, state
,
826 "Tessellation control shader outputs can only "
827 "be indexed by gl_InvocationID");
833 /* If the types are identical, the assignment can trivially proceed.
835 if (rhs
->type
== lhs
->type
)
838 /* If the array element types are the same and the LHS is unsized,
839 * the assignment is okay for initializers embedded in variable
842 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
843 * is handled by ir_dereference::is_lvalue.
845 const glsl_type
*lhs_t
= lhs
->type
;
846 const glsl_type
*rhs_t
= rhs
->type
;
847 bool unsized_array
= false;
848 while(lhs_t
->is_array()) {
850 break; /* the rest of the inner arrays match so break out early */
851 if (!rhs_t
->is_array()) {
852 unsized_array
= false;
853 break; /* number of dimensions mismatch */
855 if (lhs_t
->length
== rhs_t
->length
) {
856 lhs_t
= lhs_t
->fields
.array
;
857 rhs_t
= rhs_t
->fields
.array
;
859 } else if (lhs_t
->is_unsized_array()) {
860 unsized_array
= true;
862 unsized_array
= false;
863 break; /* sized array mismatch */
865 lhs_t
= lhs_t
->fields
.array
;
866 rhs_t
= rhs_t
->fields
.array
;
869 if (is_initializer
) {
872 _mesa_glsl_error(&loc
, state
,
873 "implicitly sized arrays cannot be assigned");
878 /* Check for implicit conversion in GLSL 1.20 */
879 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
880 if (rhs
->type
== lhs
->type
)
884 _mesa_glsl_error(&loc
, state
,
885 "%s of type %s cannot be assigned to "
886 "variable of type %s",
887 is_initializer
? "initializer" : "value",
888 rhs
->type
->name
, lhs
->type
->name
);
894 mark_whole_array_access(ir_rvalue
*access
)
896 ir_dereference_variable
*deref
= access
->as_dereference_variable();
898 if (deref
&& deref
->var
) {
899 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
904 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
905 const char *non_lvalue_description
,
906 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
907 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
912 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
914 ir_variable
*lhs_var
= lhs
->variable_referenced();
916 lhs_var
->data
.assigned
= true;
918 if (!error_emitted
) {
919 if (non_lvalue_description
!= NULL
) {
920 _mesa_glsl_error(&lhs_loc
, state
,
922 non_lvalue_description
);
923 error_emitted
= true;
924 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
925 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
926 lhs_var
->data
.image_read_only
))) {
927 /* We can have image_read_only set on both images and buffer variables,
928 * but in the former there is a distinction between assignments to
929 * the variable itself (read_only) and to the memory they point to
930 * (image_read_only), while in the case of buffer variables there is
931 * no such distinction, that is why this check here is limited to
932 * buffer variables alone.
934 _mesa_glsl_error(&lhs_loc
, state
,
935 "assignment to read-only variable '%s'",
937 error_emitted
= true;
938 } else if (lhs
->type
->is_array() &&
939 !state
->check_version(120, 300, &lhs_loc
,
940 "whole array assignment forbidden")) {
941 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
943 * "Other binary or unary expressions, non-dereferenced
944 * arrays, function names, swizzles with repeated fields,
945 * and constants cannot be l-values."
947 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
949 error_emitted
= true;
950 } else if (!lhs
->is_lvalue()) {
951 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
952 error_emitted
= true;
957 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
958 if (new_rhs
!= NULL
) {
961 /* If the LHS array was not declared with a size, it takes it size from
962 * the RHS. If the LHS is an l-value and a whole array, it must be a
963 * dereference of a variable. Any other case would require that the LHS
964 * is either not an l-value or not a whole array.
966 if (lhs
->type
->is_unsized_array()) {
967 ir_dereference
*const d
= lhs
->as_dereference();
971 ir_variable
*const var
= d
->variable_referenced();
975 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
976 /* FINISHME: This should actually log the location of the RHS. */
977 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
979 var
->data
.max_array_access
);
982 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
983 rhs
->type
->array_size());
986 if (lhs
->type
->is_array()) {
987 mark_whole_array_access(rhs
);
988 mark_whole_array_access(lhs
);
992 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
993 * but not post_inc) need the converted assigned value as an rvalue
994 * to handle things like:
999 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1001 instructions
->push_tail(var
);
1002 instructions
->push_tail(assign(var
, rhs
));
1004 if (!error_emitted
) {
1005 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
1006 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1008 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
1010 *out_rvalue
= rvalue
;
1013 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1017 return error_emitted
;
1021 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1023 void *ctx
= ralloc_parent(lvalue
);
1026 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1028 instructions
->push_tail(var
);
1030 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1033 return new(ctx
) ir_dereference_variable(var
);
1038 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1040 (void) instructions
;
1047 ast_node::has_sequence_subexpression() const
1053 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1054 struct _mesa_glsl_parse_state
*state
)
1056 (void)hir(instructions
, state
);
1060 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1061 struct _mesa_glsl_parse_state
*state
)
1063 (void)hir(instructions
, state
);
1067 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1070 ir_rvalue
*cmp
= NULL
;
1072 if (operation
== ir_binop_all_equal
)
1073 join_op
= ir_binop_logic_and
;
1075 join_op
= ir_binop_logic_or
;
1077 switch (op0
->type
->base_type
) {
1078 case GLSL_TYPE_FLOAT
:
1079 case GLSL_TYPE_UINT
:
1081 case GLSL_TYPE_BOOL
:
1082 case GLSL_TYPE_DOUBLE
:
1083 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1085 case GLSL_TYPE_ARRAY
: {
1086 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1087 ir_rvalue
*e0
, *e1
, *result
;
1089 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1090 new(mem_ctx
) ir_constant(i
));
1091 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1092 new(mem_ctx
) ir_constant(i
));
1093 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1096 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1102 mark_whole_array_access(op0
);
1103 mark_whole_array_access(op1
);
1107 case GLSL_TYPE_STRUCT
: {
1108 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1109 ir_rvalue
*e0
, *e1
, *result
;
1110 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1112 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1114 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1116 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1119 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1127 case GLSL_TYPE_ERROR
:
1128 case GLSL_TYPE_VOID
:
1129 case GLSL_TYPE_SAMPLER
:
1130 case GLSL_TYPE_IMAGE
:
1131 case GLSL_TYPE_INTERFACE
:
1132 case GLSL_TYPE_FUNCTION
:
1133 case GLSL_TYPE_ATOMIC_UINT
:
1134 case GLSL_TYPE_SUBROUTINE
:
1135 /* I assume a comparison of a struct containing a sampler just
1136 * ignores the sampler present in the type.
1142 cmp
= new(mem_ctx
) ir_constant(true);
1147 /* For logical operations, we want to ensure that the operands are
1148 * scalar booleans. If it isn't, emit an error and return a constant
1149 * boolean to avoid triggering cascading error messages.
1152 get_scalar_boolean_operand(exec_list
*instructions
,
1153 struct _mesa_glsl_parse_state
*state
,
1154 ast_expression
*parent_expr
,
1156 const char *operand_name
,
1157 bool *error_emitted
)
1159 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1161 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1163 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1166 if (!*error_emitted
) {
1167 YYLTYPE loc
= expr
->get_location();
1168 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1170 parent_expr
->operator_string(parent_expr
->oper
));
1171 *error_emitted
= true;
1174 return new(ctx
) ir_constant(true);
1178 * If name refers to a builtin array whose maximum allowed size is less than
1179 * size, report an error and return true. Otherwise return false.
1182 check_builtin_array_max_size(const char *name
, unsigned size
,
1183 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1185 if ((strcmp("gl_TexCoord", name
) == 0)
1186 && (size
> state
->Const
.MaxTextureCoords
)) {
1187 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1189 * "The size [of gl_TexCoord] can be at most
1190 * gl_MaxTextureCoords."
1192 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1193 "be larger than gl_MaxTextureCoords (%u)",
1194 state
->Const
.MaxTextureCoords
);
1195 } else if (strcmp("gl_ClipDistance", name
) == 0
1196 && size
> state
->Const
.MaxClipPlanes
) {
1197 /* From section 7.1 (Vertex Shader Special Variables) of the
1200 * "The gl_ClipDistance array is predeclared as unsized and
1201 * must be sized by the shader either redeclaring it with a
1202 * size or indexing it only with integral constant
1203 * expressions. ... The size can be at most
1204 * gl_MaxClipDistances."
1206 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1207 "be larger than gl_MaxClipDistances (%u)",
1208 state
->Const
.MaxClipPlanes
);
1213 * Create the constant 1, of a which is appropriate for incrementing and
1214 * decrementing values of the given GLSL type. For example, if type is vec4,
1215 * this creates a constant value of 1.0 having type float.
1217 * If the given type is invalid for increment and decrement operators, return
1218 * a floating point 1--the error will be detected later.
1221 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1223 switch (type
->base_type
) {
1224 case GLSL_TYPE_UINT
:
1225 return new(ctx
) ir_constant((unsigned) 1);
1227 return new(ctx
) ir_constant(1);
1229 case GLSL_TYPE_FLOAT
:
1230 return new(ctx
) ir_constant(1.0f
);
1235 ast_expression::hir(exec_list
*instructions
,
1236 struct _mesa_glsl_parse_state
*state
)
1238 return do_hir(instructions
, state
, true);
1242 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1243 struct _mesa_glsl_parse_state
*state
)
1245 do_hir(instructions
, state
, false);
1249 ast_expression::do_hir(exec_list
*instructions
,
1250 struct _mesa_glsl_parse_state
*state
,
1254 static const int operations
[AST_NUM_OPERATORS
] = {
1255 -1, /* ast_assign doesn't convert to ir_expression. */
1256 -1, /* ast_plus doesn't convert to ir_expression. */
1270 ir_binop_any_nequal
,
1280 /* Note: The following block of expression types actually convert
1281 * to multiple IR instructions.
1283 ir_binop_mul
, /* ast_mul_assign */
1284 ir_binop_div
, /* ast_div_assign */
1285 ir_binop_mod
, /* ast_mod_assign */
1286 ir_binop_add
, /* ast_add_assign */
1287 ir_binop_sub
, /* ast_sub_assign */
1288 ir_binop_lshift
, /* ast_ls_assign */
1289 ir_binop_rshift
, /* ast_rs_assign */
1290 ir_binop_bit_and
, /* ast_and_assign */
1291 ir_binop_bit_xor
, /* ast_xor_assign */
1292 ir_binop_bit_or
, /* ast_or_assign */
1294 -1, /* ast_conditional doesn't convert to ir_expression. */
1295 ir_binop_add
, /* ast_pre_inc. */
1296 ir_binop_sub
, /* ast_pre_dec. */
1297 ir_binop_add
, /* ast_post_inc. */
1298 ir_binop_sub
, /* ast_post_dec. */
1299 -1, /* ast_field_selection doesn't conv to ir_expression. */
1300 -1, /* ast_array_index doesn't convert to ir_expression. */
1301 -1, /* ast_function_call doesn't conv to ir_expression. */
1302 -1, /* ast_identifier doesn't convert to ir_expression. */
1303 -1, /* ast_int_constant doesn't convert to ir_expression. */
1304 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1305 -1, /* ast_float_constant doesn't conv to ir_expression. */
1306 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1307 -1, /* ast_sequence doesn't convert to ir_expression. */
1309 ir_rvalue
*result
= NULL
;
1311 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1312 bool error_emitted
= false;
1315 loc
= this->get_location();
1317 switch (this->oper
) {
1319 assert(!"ast_aggregate: Should never get here.");
1323 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1324 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1327 do_assignment(instructions
, state
,
1328 this->subexpressions
[0]->non_lvalue_description
,
1329 op
[0], op
[1], &result
, needs_rvalue
, false,
1330 this->subexpressions
[0]->get_location());
1335 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1337 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1339 error_emitted
= type
->is_error();
1345 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1347 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1349 error_emitted
= type
->is_error();
1351 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1359 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1360 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1362 type
= arithmetic_result_type(op
[0], op
[1],
1363 (this->oper
== ast_mul
),
1365 error_emitted
= type
->is_error();
1367 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1372 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1373 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1375 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1377 assert(operations
[this->oper
] == ir_binop_mod
);
1379 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1381 error_emitted
= type
->is_error();
1386 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1387 error_emitted
= true;
1390 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1391 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1392 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1394 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1396 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1403 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1404 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1406 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1408 /* The relational operators must either generate an error or result
1409 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1411 assert(type
->is_error()
1412 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1413 && type
->is_scalar()));
1415 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1417 error_emitted
= type
->is_error();
1422 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1423 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1425 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1427 * "The equality operators equal (==), and not equal (!=)
1428 * operate on all types. They result in a scalar Boolean. If
1429 * the operand types do not match, then there must be a
1430 * conversion from Section 4.1.10 "Implicit Conversions"
1431 * applied to one operand that can make them match, in which
1432 * case this conversion is done."
1435 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1436 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1437 "no operation `%1$s' exists that takes a left-hand "
1438 "operand of type 'void' or a right operand of type "
1439 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1440 error_emitted
= true;
1441 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1442 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1443 || (op
[0]->type
!= op
[1]->type
)) {
1444 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1445 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1446 error_emitted
= true;
1447 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1448 !state
->check_version(120, 300, &loc
,
1449 "array comparisons forbidden")) {
1450 error_emitted
= true;
1451 } else if ((op
[0]->type
->contains_opaque() ||
1452 op
[1]->type
->contains_opaque())) {
1453 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1454 error_emitted
= true;
1457 if (error_emitted
) {
1458 result
= new(ctx
) ir_constant(false);
1460 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1461 assert(result
->type
== glsl_type::bool_type
);
1468 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1469 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1470 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1471 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1473 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1477 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1479 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1480 error_emitted
= true;
1483 if (!op
[0]->type
->is_integer()) {
1484 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1485 error_emitted
= true;
1488 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1489 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1492 case ast_logic_and
: {
1493 exec_list rhs_instructions
;
1494 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1495 "LHS", &error_emitted
);
1496 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1497 "RHS", &error_emitted
);
1499 if (rhs_instructions
.is_empty()) {
1500 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1501 type
= result
->type
;
1503 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1506 instructions
->push_tail(tmp
);
1508 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1509 instructions
->push_tail(stmt
);
1511 stmt
->then_instructions
.append_list(&rhs_instructions
);
1512 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1513 ir_assignment
*const then_assign
=
1514 new(ctx
) ir_assignment(then_deref
, op
[1]);
1515 stmt
->then_instructions
.push_tail(then_assign
);
1517 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1518 ir_assignment
*const else_assign
=
1519 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1520 stmt
->else_instructions
.push_tail(else_assign
);
1522 result
= new(ctx
) ir_dereference_variable(tmp
);
1528 case ast_logic_or
: {
1529 exec_list rhs_instructions
;
1530 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1531 "LHS", &error_emitted
);
1532 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1533 "RHS", &error_emitted
);
1535 if (rhs_instructions
.is_empty()) {
1536 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1537 type
= result
->type
;
1539 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1542 instructions
->push_tail(tmp
);
1544 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1545 instructions
->push_tail(stmt
);
1547 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1548 ir_assignment
*const then_assign
=
1549 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1550 stmt
->then_instructions
.push_tail(then_assign
);
1552 stmt
->else_instructions
.append_list(&rhs_instructions
);
1553 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1554 ir_assignment
*const else_assign
=
1555 new(ctx
) ir_assignment(else_deref
, op
[1]);
1556 stmt
->else_instructions
.push_tail(else_assign
);
1558 result
= new(ctx
) ir_dereference_variable(tmp
);
1565 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1567 * "The logical binary operators and (&&), or ( | | ), and
1568 * exclusive or (^^). They operate only on two Boolean
1569 * expressions and result in a Boolean expression."
1571 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1573 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1576 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1581 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1582 "operand", &error_emitted
);
1584 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1588 case ast_mul_assign
:
1589 case ast_div_assign
:
1590 case ast_add_assign
:
1591 case ast_sub_assign
: {
1592 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1593 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1595 type
= arithmetic_result_type(op
[0], op
[1],
1596 (this->oper
== ast_mul_assign
),
1599 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1603 do_assignment(instructions
, state
,
1604 this->subexpressions
[0]->non_lvalue_description
,
1605 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1606 &result
, needs_rvalue
, false,
1607 this->subexpressions
[0]->get_location());
1609 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1610 * explicitly test for this because none of the binary expression
1611 * operators allow array operands either.
1617 case ast_mod_assign
: {
1618 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1619 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1621 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1623 assert(operations
[this->oper
] == ir_binop_mod
);
1625 ir_rvalue
*temp_rhs
;
1626 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1630 do_assignment(instructions
, state
,
1631 this->subexpressions
[0]->non_lvalue_description
,
1632 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1633 &result
, needs_rvalue
, false,
1634 this->subexpressions
[0]->get_location());
1639 case ast_rs_assign
: {
1640 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1641 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1642 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1644 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1645 type
, op
[0], op
[1]);
1647 do_assignment(instructions
, state
,
1648 this->subexpressions
[0]->non_lvalue_description
,
1649 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1650 &result
, needs_rvalue
, false,
1651 this->subexpressions
[0]->get_location());
1655 case ast_and_assign
:
1656 case ast_xor_assign
:
1657 case ast_or_assign
: {
1658 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1659 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1660 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1661 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1662 type
, op
[0], op
[1]);
1664 do_assignment(instructions
, state
,
1665 this->subexpressions
[0]->non_lvalue_description
,
1666 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1667 &result
, needs_rvalue
, false,
1668 this->subexpressions
[0]->get_location());
1672 case ast_conditional
: {
1673 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1675 * "The ternary selection operator (?:). It operates on three
1676 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1677 * first expression, which must result in a scalar Boolean."
1679 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1680 "condition", &error_emitted
);
1682 /* The :? operator is implemented by generating an anonymous temporary
1683 * followed by an if-statement. The last instruction in each branch of
1684 * the if-statement assigns a value to the anonymous temporary. This
1685 * temporary is the r-value of the expression.
1687 exec_list then_instructions
;
1688 exec_list else_instructions
;
1690 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1691 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1693 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1695 * "The second and third expressions can be any type, as
1696 * long their types match, or there is a conversion in
1697 * Section 4.1.10 "Implicit Conversions" that can be applied
1698 * to one of the expressions to make their types match. This
1699 * resulting matching type is the type of the entire
1702 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1703 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1704 || (op
[1]->type
!= op
[2]->type
)) {
1705 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1707 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1708 "operator must have matching types");
1709 error_emitted
= true;
1710 type
= glsl_type::error_type
;
1715 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1717 * "The second and third expressions must be the same type, but can
1718 * be of any type other than an array."
1720 if (type
->is_array() &&
1721 !state
->check_version(120, 300, &loc
,
1722 "second and third operands of ?: operator "
1723 "cannot be arrays")) {
1724 error_emitted
= true;
1727 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1729 * "Except for array indexing, structure member selection, and
1730 * parentheses, opaque variables are not allowed to be operands in
1731 * expressions; such use results in a compile-time error."
1733 if (type
->contains_opaque()) {
1734 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1735 "of the ?: operator");
1736 error_emitted
= true;
1739 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1741 if (then_instructions
.is_empty()
1742 && else_instructions
.is_empty()
1743 && cond_val
!= NULL
) {
1744 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1746 /* The copy to conditional_tmp reads the whole array. */
1747 if (type
->is_array()) {
1748 mark_whole_array_access(op
[1]);
1749 mark_whole_array_access(op
[2]);
1752 ir_variable
*const tmp
=
1753 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1754 instructions
->push_tail(tmp
);
1756 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1757 instructions
->push_tail(stmt
);
1759 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1760 ir_dereference
*const then_deref
=
1761 new(ctx
) ir_dereference_variable(tmp
);
1762 ir_assignment
*const then_assign
=
1763 new(ctx
) ir_assignment(then_deref
, op
[1]);
1764 stmt
->then_instructions
.push_tail(then_assign
);
1766 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1767 ir_dereference
*const else_deref
=
1768 new(ctx
) ir_dereference_variable(tmp
);
1769 ir_assignment
*const else_assign
=
1770 new(ctx
) ir_assignment(else_deref
, op
[2]);
1771 stmt
->else_instructions
.push_tail(else_assign
);
1773 result
= new(ctx
) ir_dereference_variable(tmp
);
1780 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1781 ? "pre-increment operation" : "pre-decrement operation";
1783 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1784 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1786 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1788 ir_rvalue
*temp_rhs
;
1789 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1793 do_assignment(instructions
, state
,
1794 this->subexpressions
[0]->non_lvalue_description
,
1795 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1796 &result
, needs_rvalue
, false,
1797 this->subexpressions
[0]->get_location());
1802 case ast_post_dec
: {
1803 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1804 ? "post-increment operation" : "post-decrement operation";
1805 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1806 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1808 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1810 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1812 ir_rvalue
*temp_rhs
;
1813 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1816 /* Get a temporary of a copy of the lvalue before it's modified.
1817 * This may get thrown away later.
1819 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1821 ir_rvalue
*junk_rvalue
;
1823 do_assignment(instructions
, state
,
1824 this->subexpressions
[0]->non_lvalue_description
,
1825 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1826 &junk_rvalue
, false, false,
1827 this->subexpressions
[0]->get_location());
1832 case ast_field_selection
:
1833 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1836 case ast_array_index
: {
1837 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1839 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1840 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1842 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1845 if (result
->type
->is_error())
1846 error_emitted
= true;
1851 case ast_unsized_array_dim
:
1852 assert(!"ast_unsized_array_dim: Should never get here.");
1855 case ast_function_call
:
1856 /* Should *NEVER* get here. ast_function_call should always be handled
1857 * by ast_function_expression::hir.
1862 case ast_identifier
: {
1863 /* ast_identifier can appear several places in a full abstract syntax
1864 * tree. This particular use must be at location specified in the grammar
1865 * as 'variable_identifier'.
1868 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1871 var
->data
.used
= true;
1872 result
= new(ctx
) ir_dereference_variable(var
);
1874 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1875 this->primary_expression
.identifier
);
1877 result
= ir_rvalue::error_value(ctx
);
1878 error_emitted
= true;
1883 case ast_int_constant
:
1884 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1887 case ast_uint_constant
:
1888 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1891 case ast_float_constant
:
1892 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1895 case ast_bool_constant
:
1896 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1899 case ast_double_constant
:
1900 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1903 case ast_sequence
: {
1904 /* It should not be possible to generate a sequence in the AST without
1905 * any expressions in it.
1907 assert(!this->expressions
.is_empty());
1909 /* The r-value of a sequence is the last expression in the sequence. If
1910 * the other expressions in the sequence do not have side-effects (and
1911 * therefore add instructions to the instruction list), they get dropped
1914 exec_node
*previous_tail_pred
= NULL
;
1915 YYLTYPE previous_operand_loc
= loc
;
1917 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1918 /* If one of the operands of comma operator does not generate any
1919 * code, we want to emit a warning. At each pass through the loop
1920 * previous_tail_pred will point to the last instruction in the
1921 * stream *before* processing the previous operand. Naturally,
1922 * instructions->tail_pred will point to the last instruction in the
1923 * stream *after* processing the previous operand. If the two
1924 * pointers match, then the previous operand had no effect.
1926 * The warning behavior here differs slightly from GCC. GCC will
1927 * only emit a warning if none of the left-hand operands have an
1928 * effect. However, it will emit a warning for each. I believe that
1929 * there are some cases in C (especially with GCC extensions) where
1930 * it is useful to have an intermediate step in a sequence have no
1931 * effect, but I don't think these cases exist in GLSL. Either way,
1932 * it would be a giant hassle to replicate that behavior.
1934 if (previous_tail_pred
== instructions
->tail_pred
) {
1935 _mesa_glsl_warning(&previous_operand_loc
, state
,
1936 "left-hand operand of comma expression has "
1940 /* tail_pred is directly accessed instead of using the get_tail()
1941 * method for performance reasons. get_tail() has extra code to
1942 * return NULL when the list is empty. We don't care about that
1943 * here, so using tail_pred directly is fine.
1945 previous_tail_pred
= instructions
->tail_pred
;
1946 previous_operand_loc
= ast
->get_location();
1948 result
= ast
->hir(instructions
, state
);
1951 /* Any errors should have already been emitted in the loop above.
1953 error_emitted
= true;
1957 type
= NULL
; /* use result->type, not type. */
1958 assert(result
!= NULL
|| !needs_rvalue
);
1960 if (result
&& result
->type
->is_error() && !error_emitted
)
1961 _mesa_glsl_error(& loc
, state
, "type mismatch");
1967 ast_expression::has_sequence_subexpression() const
1969 switch (this->oper
) {
1978 return this->subexpressions
[0]->has_sequence_subexpression();
2000 case ast_array_index
:
2001 case ast_mul_assign
:
2002 case ast_div_assign
:
2003 case ast_add_assign
:
2004 case ast_sub_assign
:
2005 case ast_mod_assign
:
2008 case ast_and_assign
:
2009 case ast_xor_assign
:
2011 return this->subexpressions
[0]->has_sequence_subexpression() ||
2012 this->subexpressions
[1]->has_sequence_subexpression();
2014 case ast_conditional
:
2015 return this->subexpressions
[0]->has_sequence_subexpression() ||
2016 this->subexpressions
[1]->has_sequence_subexpression() ||
2017 this->subexpressions
[2]->has_sequence_subexpression();
2022 case ast_field_selection
:
2023 case ast_identifier
:
2024 case ast_int_constant
:
2025 case ast_uint_constant
:
2026 case ast_float_constant
:
2027 case ast_bool_constant
:
2028 case ast_double_constant
:
2032 unreachable("ast_aggregate: Should never get here.");
2034 case ast_function_call
:
2035 unreachable("should be handled by ast_function_expression::hir");
2037 case ast_unsized_array_dim
:
2038 unreachable("ast_unsized_array_dim: Should never get here.");
2045 ast_expression_statement::hir(exec_list
*instructions
,
2046 struct _mesa_glsl_parse_state
*state
)
2048 /* It is possible to have expression statements that don't have an
2049 * expression. This is the solitary semicolon:
2051 * for (i = 0; i < 5; i++)
2054 * In this case the expression will be NULL. Test for NULL and don't do
2055 * anything in that case.
2057 if (expression
!= NULL
)
2058 expression
->hir_no_rvalue(instructions
, state
);
2060 /* Statements do not have r-values.
2067 ast_compound_statement::hir(exec_list
*instructions
,
2068 struct _mesa_glsl_parse_state
*state
)
2071 state
->symbols
->push_scope();
2073 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2074 ast
->hir(instructions
, state
);
2077 state
->symbols
->pop_scope();
2079 /* Compound statements do not have r-values.
2085 * Evaluate the given exec_node (which should be an ast_node representing
2086 * a single array dimension) and return its integer value.
2089 process_array_size(exec_node
*node
,
2090 struct _mesa_glsl_parse_state
*state
)
2092 exec_list dummy_instructions
;
2094 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2097 * Dimensions other than the outermost dimension can by unsized if they
2098 * are immediately sized by a constructor or initializer.
2100 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2103 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2104 YYLTYPE loc
= array_size
->get_location();
2107 _mesa_glsl_error(& loc
, state
,
2108 "array size could not be resolved");
2112 if (!ir
->type
->is_integer()) {
2113 _mesa_glsl_error(& loc
, state
,
2114 "array size must be integer type");
2118 if (!ir
->type
->is_scalar()) {
2119 _mesa_glsl_error(& loc
, state
,
2120 "array size must be scalar type");
2124 ir_constant
*const size
= ir
->constant_expression_value();
2125 if (size
== NULL
|| array_size
->has_sequence_subexpression()) {
2126 _mesa_glsl_error(& loc
, state
, "array size must be a "
2127 "constant valued expression");
2131 if (size
->value
.i
[0] <= 0) {
2132 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2136 assert(size
->type
== ir
->type
);
2138 /* If the array size is const (and we've verified that
2139 * it is) then no instructions should have been emitted
2140 * when we converted it to HIR. If they were emitted,
2141 * then either the array size isn't const after all, or
2142 * we are emitting unnecessary instructions.
2144 assert(dummy_instructions
.is_empty());
2146 return size
->value
.u
[0];
2149 static const glsl_type
*
2150 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2151 ast_array_specifier
*array_specifier
,
2152 struct _mesa_glsl_parse_state
*state
)
2154 const glsl_type
*array_type
= base
;
2156 if (array_specifier
!= NULL
) {
2157 if (base
->is_array()) {
2159 /* From page 19 (page 25) of the GLSL 1.20 spec:
2161 * "Only one-dimensional arrays may be declared."
2163 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2164 return glsl_type::error_type
;
2168 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2169 !node
->is_head_sentinel(); node
= node
->prev
) {
2170 unsigned array_size
= process_array_size(node
, state
);
2171 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2179 precision_qualifier_allowed(const glsl_type
*type
)
2181 /* Precision qualifiers apply to floating point, integer and opaque
2184 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2185 * "Any floating point or any integer declaration can have the type
2186 * preceded by one of these precision qualifiers [...] Literal
2187 * constants do not have precision qualifiers. Neither do Boolean
2190 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2193 * "Precision qualifiers are added for code portability with OpenGL
2194 * ES, not for functionality. They have the same syntax as in OpenGL
2197 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2199 * "uniform lowp sampler2D sampler;
2202 * lowp vec4 col = texture2D (sampler, coord);
2203 * // texture2D returns lowp"
2205 * From this, we infer that GLSL 1.30 (and later) should allow precision
2206 * qualifiers on sampler types just like float and integer types.
2208 return (type
->is_float()
2209 || type
->is_integer()
2210 || type
->contains_opaque())
2211 && !type
->without_array()->is_record();
2215 ast_type_specifier::glsl_type(const char **name
,
2216 struct _mesa_glsl_parse_state
*state
) const
2218 const struct glsl_type
*type
;
2220 type
= state
->symbols
->get_type(this->type_name
);
2221 *name
= this->type_name
;
2223 YYLTYPE loc
= this->get_location();
2224 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2230 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2232 * "The precision statement
2234 * precision precision-qualifier type;
2236 * can be used to establish a default precision qualifier. The type field can
2237 * be either int or float or any of the sampler types, (...) If type is float,
2238 * the directive applies to non-precision-qualified floating point type
2239 * (scalar, vector, and matrix) declarations. If type is int, the directive
2240 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2241 * and unsigned) declarations."
2243 * We use the symbol table to keep the values of the default precisions for
2244 * each 'type' in each scope and we use the 'type' string from the precision
2245 * statement as key in the symbol table. When we want to retrieve the default
2246 * precision associated with a given glsl_type we need to know the type string
2247 * associated with it. This is what this function returns.
2250 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2252 switch (type
->base_type
) {
2253 case GLSL_TYPE_FLOAT
:
2255 case GLSL_TYPE_UINT
:
2258 case GLSL_TYPE_ATOMIC_UINT
:
2259 return "atomic_uint";
2260 case GLSL_TYPE_IMAGE
:
2262 case GLSL_TYPE_SAMPLER
: {
2263 const unsigned type_idx
=
2264 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2265 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2266 assert(type_idx
< 4);
2267 switch (type
->sampler_type
) {
2268 case GLSL_TYPE_FLOAT
:
2269 switch (type
->sampler_dimensionality
) {
2270 case GLSL_SAMPLER_DIM_1D
: {
2271 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2272 static const char *const names
[4] = {
2273 "sampler1D", "sampler1DArray",
2274 "sampler1DShadow", "sampler1DArrayShadow"
2276 return names
[type_idx
];
2278 case GLSL_SAMPLER_DIM_2D
: {
2279 static const char *const names
[8] = {
2280 "sampler2D", "sampler2DArray",
2281 "sampler2DShadow", "sampler2DArrayShadow",
2282 "image2D", "image2DArray", NULL
, NULL
2284 return names
[offset
+ type_idx
];
2286 case GLSL_SAMPLER_DIM_3D
: {
2287 static const char *const names
[8] = {
2288 "sampler3D", NULL
, NULL
, NULL
,
2289 "image3D", NULL
, NULL
, NULL
2291 return names
[offset
+ type_idx
];
2293 case GLSL_SAMPLER_DIM_CUBE
: {
2294 static const char *const names
[8] = {
2295 "samplerCube", "samplerCubeArray",
2296 "samplerCubeShadow", "samplerCubeArrayShadow",
2297 "imageCube", NULL
, NULL
, NULL
2299 return names
[offset
+ type_idx
];
2301 case GLSL_SAMPLER_DIM_MS
: {
2302 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2303 static const char *const names
[4] = {
2304 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2306 return names
[type_idx
];
2308 case GLSL_SAMPLER_DIM_RECT
: {
2309 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2310 static const char *const names
[4] = {
2311 "samplerRect", NULL
, "samplerRectShadow", NULL
2313 return names
[type_idx
];
2315 case GLSL_SAMPLER_DIM_BUF
: {
2316 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2317 static const char *const names
[4] = {
2318 "samplerBuffer", NULL
, NULL
, NULL
2320 return names
[type_idx
];
2322 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2323 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2324 static const char *const names
[4] = {
2325 "samplerExternalOES", NULL
, NULL
, NULL
2327 return names
[type_idx
];
2330 unreachable("Unsupported sampler/image dimensionality");
2331 } /* sampler/image float dimensionality */
2334 switch (type
->sampler_dimensionality
) {
2335 case GLSL_SAMPLER_DIM_1D
: {
2336 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2337 static const char *const names
[4] = {
2338 "isampler1D", "isampler1DArray", NULL
, NULL
2340 return names
[type_idx
];
2342 case GLSL_SAMPLER_DIM_2D
: {
2343 static const char *const names
[8] = {
2344 "isampler2D", "isampler2DArray", NULL
, NULL
,
2345 "iimage2D", "iimage2DArray", NULL
, NULL
2347 return names
[offset
+ type_idx
];
2349 case GLSL_SAMPLER_DIM_3D
: {
2350 static const char *const names
[8] = {
2351 "isampler3D", NULL
, NULL
, NULL
,
2352 "iimage3D", NULL
, NULL
, NULL
2354 return names
[offset
+ type_idx
];
2356 case GLSL_SAMPLER_DIM_CUBE
: {
2357 static const char *const names
[8] = {
2358 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2359 "iimageCube", NULL
, NULL
, NULL
2361 return names
[offset
+ type_idx
];
2363 case GLSL_SAMPLER_DIM_MS
: {
2364 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2365 static const char *const names
[4] = {
2366 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2368 return names
[type_idx
];
2370 case GLSL_SAMPLER_DIM_RECT
: {
2371 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2372 static const char *const names
[4] = {
2373 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2375 return names
[type_idx
];
2377 case GLSL_SAMPLER_DIM_BUF
: {
2378 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2379 static const char *const names
[4] = {
2380 "isamplerBuffer", NULL
, NULL
, NULL
2382 return names
[type_idx
];
2385 unreachable("Unsupported isampler/iimage dimensionality");
2386 } /* sampler/image int dimensionality */
2388 case GLSL_TYPE_UINT
:
2389 switch (type
->sampler_dimensionality
) {
2390 case GLSL_SAMPLER_DIM_1D
: {
2391 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2392 static const char *const names
[4] = {
2393 "usampler1D", "usampler1DArray", NULL
, NULL
2395 return names
[type_idx
];
2397 case GLSL_SAMPLER_DIM_2D
: {
2398 static const char *const names
[8] = {
2399 "usampler2D", "usampler2DArray", NULL
, NULL
,
2400 "uimage2D", "uimage2DArray", NULL
, NULL
2402 return names
[offset
+ type_idx
];
2404 case GLSL_SAMPLER_DIM_3D
: {
2405 static const char *const names
[8] = {
2406 "usampler3D", NULL
, NULL
, NULL
,
2407 "uimage3D", NULL
, NULL
, NULL
2409 return names
[offset
+ type_idx
];
2411 case GLSL_SAMPLER_DIM_CUBE
: {
2412 static const char *const names
[8] = {
2413 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2414 "uimageCube", NULL
, NULL
, NULL
2416 return names
[offset
+ type_idx
];
2418 case GLSL_SAMPLER_DIM_MS
: {
2419 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2420 static const char *const names
[4] = {
2421 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2423 return names
[type_idx
];
2425 case GLSL_SAMPLER_DIM_RECT
: {
2426 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2427 static const char *const names
[4] = {
2428 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2430 return names
[type_idx
];
2432 case GLSL_SAMPLER_DIM_BUF
: {
2433 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2434 static const char *const names
[4] = {
2435 "usamplerBuffer", NULL
, NULL
, NULL
2437 return names
[type_idx
];
2440 unreachable("Unsupported usampler/uimage dimensionality");
2441 } /* sampler/image uint dimensionality */
2444 unreachable("Unsupported sampler/image type");
2445 } /* sampler/image type */
2447 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2450 unreachable("Unsupported type");
2455 select_gles_precision(unsigned qual_precision
,
2456 const glsl_type
*type
,
2457 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2459 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2460 * In GLES we take the precision from the type qualifier if present,
2461 * otherwise, if the type of the variable allows precision qualifiers at
2462 * all, we look for the default precision qualifier for that type in the
2465 assert(state
->es_shader
);
2467 unsigned precision
= GLSL_PRECISION_NONE
;
2468 if (qual_precision
) {
2469 precision
= qual_precision
;
2470 } else if (precision_qualifier_allowed(type
)) {
2471 const char *type_name
=
2472 get_type_name_for_precision_qualifier(type
->without_array());
2473 assert(type_name
!= NULL
);
2476 state
->symbols
->get_default_precision_qualifier(type_name
);
2477 if (precision
== ast_precision_none
) {
2478 _mesa_glsl_error(loc
, state
,
2479 "No precision specified in this scope for type `%s'",
2487 ast_fully_specified_type::glsl_type(const char **name
,
2488 struct _mesa_glsl_parse_state
*state
) const
2490 return this->specifier
->glsl_type(name
, state
);
2494 * Determine whether a toplevel variable declaration declares a varying. This
2495 * function operates by examining the variable's mode and the shader target,
2496 * so it correctly identifies linkage variables regardless of whether they are
2497 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2499 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2500 * this function will produce undefined results.
2503 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2506 case MESA_SHADER_VERTEX
:
2507 return var
->data
.mode
== ir_var_shader_out
;
2508 case MESA_SHADER_FRAGMENT
:
2509 return var
->data
.mode
== ir_var_shader_in
;
2511 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2517 * Matrix layout qualifiers are only allowed on certain types
2520 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2522 const glsl_type
*type
,
2525 if (var
&& !var
->is_in_buffer_block()) {
2526 /* Layout qualifiers may only apply to interface blocks and fields in
2529 _mesa_glsl_error(loc
, state
,
2530 "uniform block layout qualifiers row_major and "
2531 "column_major may not be applied to variables "
2532 "outside of uniform blocks");
2533 } else if (!type
->without_array()->is_matrix()) {
2534 /* The OpenGL ES 3.0 conformance tests did not originally allow
2535 * matrix layout qualifiers on non-matrices. However, the OpenGL
2536 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2537 * amended to specifically allow these layouts on all types. Emit
2538 * a warning so that people know their code may not be portable.
2540 _mesa_glsl_warning(loc
, state
,
2541 "uniform block layout qualifiers row_major and "
2542 "column_major applied to non-matrix types may "
2543 "be rejected by older compilers");
2548 process_qualifier_constant(struct _mesa_glsl_parse_state
*state
,
2550 const char *qual_indentifier
,
2551 ast_expression
*const_expression
,
2554 exec_list dummy_instructions
;
2556 if (const_expression
== NULL
) {
2561 ir_rvalue
*const ir
= const_expression
->hir(&dummy_instructions
, state
);
2563 ir_constant
*const const_int
= ir
->constant_expression_value();
2564 if (const_int
== NULL
|| !const_int
->type
->is_integer()) {
2565 _mesa_glsl_error(loc
, state
, "%s must be an integral constant "
2566 "expression", qual_indentifier
);
2570 if (const_int
->value
.i
[0] < 0) {
2571 _mesa_glsl_error(loc
, state
, "%s layout qualifier is invalid (%d < 0)",
2572 qual_indentifier
, const_int
->value
.u
[0]);
2576 /* If the location is const (and we've verified that
2577 * it is) then no instructions should have been emitted
2578 * when we converted it to HIR. If they were emitted,
2579 * then either the location isn't const after all, or
2580 * we are emitting unnecessary instructions.
2582 assert(dummy_instructions
.is_empty());
2584 *value
= const_int
->value
.u
[0];
2589 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2592 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2593 _mesa_glsl_error(loc
, state
,
2594 "invalid stream specified %d is larger than "
2595 "MAX_VERTEX_STREAMS - 1 (%d).",
2596 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2604 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2607 const glsl_type
*type
,
2608 const ast_type_qualifier
*qual
)
2610 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2611 _mesa_glsl_error(loc
, state
,
2612 "the \"binding\" qualifier only applies to uniforms and "
2613 "shader storage buffer objects");
2617 unsigned qual_binding
;
2618 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2623 const struct gl_context
*const ctx
= state
->ctx
;
2624 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2625 unsigned max_index
= qual_binding
+ elements
- 1;
2626 const glsl_type
*base_type
= type
->without_array();
2628 if (base_type
->is_interface()) {
2629 /* UBOs. From page 60 of the GLSL 4.20 specification:
2630 * "If the binding point for any uniform block instance is less than zero,
2631 * or greater than or equal to the implementation-dependent maximum
2632 * number of uniform buffer bindings, a compilation error will occur.
2633 * When the binding identifier is used with a uniform block instanced as
2634 * an array of size N, all elements of the array from binding through
2635 * binding + N – 1 must be within this range."
2637 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2639 if (qual
->flags
.q
.uniform
&&
2640 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2641 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2642 "the maximum number of UBO binding points (%d)",
2643 qual_binding
, elements
,
2644 ctx
->Const
.MaxUniformBufferBindings
);
2648 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2649 * "If the binding point for any uniform or shader storage block instance
2650 * is less than zero, or greater than or equal to the
2651 * implementation-dependent maximum number of uniform buffer bindings, a
2652 * compile-time error will occur. When the binding identifier is used
2653 * with a uniform or shader storage block instanced as an array of size
2654 * N, all elements of the array from binding through binding + N – 1 must
2655 * be within this range."
2657 if (qual
->flags
.q
.buffer
&&
2658 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2659 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2660 "the maximum number of SSBO binding points (%d)",
2661 qual_binding
, elements
,
2662 ctx
->Const
.MaxShaderStorageBufferBindings
);
2665 } else if (base_type
->is_sampler()) {
2666 /* Samplers. From page 63 of the GLSL 4.20 specification:
2667 * "If the binding is less than zero, or greater than or equal to the
2668 * implementation-dependent maximum supported number of units, a
2669 * compilation error will occur. When the binding identifier is used
2670 * with an array of size N, all elements of the array from binding
2671 * through binding + N - 1 must be within this range."
2673 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2675 if (max_index
>= limit
) {
2676 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2677 "exceeds the maximum number of texture image units "
2678 "(%u)", qual_binding
, elements
, limit
);
2682 } else if (base_type
->contains_atomic()) {
2683 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2684 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2685 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2686 " maximum number of atomic counter buffer bindings"
2687 "(%u)", qual_binding
,
2688 ctx
->Const
.MaxAtomicBufferBindings
);
2692 } else if ((state
->is_version(420, 310) ||
2693 state
->ARB_shading_language_420pack_enable
) &&
2694 base_type
->is_image()) {
2695 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2696 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2697 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2698 " maximum number of image units (%d)", max_index
,
2699 ctx
->Const
.MaxImageUnits
);
2704 _mesa_glsl_error(loc
, state
,
2705 "the \"binding\" qualifier only applies to uniform "
2706 "blocks, opaque variables, or arrays thereof");
2710 var
->data
.explicit_binding
= true;
2711 var
->data
.binding
= qual_binding
;
2717 static glsl_interp_qualifier
2718 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2719 ir_variable_mode mode
,
2720 struct _mesa_glsl_parse_state
*state
,
2723 glsl_interp_qualifier interpolation
;
2724 if (qual
->flags
.q
.flat
)
2725 interpolation
= INTERP_QUALIFIER_FLAT
;
2726 else if (qual
->flags
.q
.noperspective
)
2727 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2728 else if (qual
->flags
.q
.smooth
)
2729 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2731 interpolation
= INTERP_QUALIFIER_NONE
;
2733 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2734 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2735 _mesa_glsl_error(loc
, state
,
2736 "interpolation qualifier `%s' can only be applied to "
2737 "shader inputs or outputs.",
2738 interpolation_string(interpolation
));
2742 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2743 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2744 _mesa_glsl_error(loc
, state
,
2745 "interpolation qualifier `%s' cannot be applied to "
2746 "vertex shader inputs or fragment shader outputs",
2747 interpolation_string(interpolation
));
2751 return interpolation
;
2756 apply_explicit_location(const struct ast_type_qualifier
*qual
,
2758 struct _mesa_glsl_parse_state
*state
,
2763 unsigned qual_location
;
2764 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
2769 /* Checks for GL_ARB_explicit_uniform_location. */
2770 if (qual
->flags
.q
.uniform
) {
2771 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2774 const struct gl_context
*const ctx
= state
->ctx
;
2775 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
2777 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2778 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2779 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2780 ctx
->Const
.MaxUserAssignableUniformLocations
);
2784 var
->data
.explicit_location
= true;
2785 var
->data
.location
= qual_location
;
2789 /* Between GL_ARB_explicit_attrib_location an
2790 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2791 * stage can be assigned explicit locations. The checking here associates
2792 * the correct extension with the correct stage's input / output:
2796 * vertex explicit_loc sso
2797 * tess control sso sso
2800 * fragment sso explicit_loc
2802 switch (state
->stage
) {
2803 case MESA_SHADER_VERTEX
:
2804 if (var
->data
.mode
== ir_var_shader_in
) {
2805 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2811 if (var
->data
.mode
== ir_var_shader_out
) {
2812 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2821 case MESA_SHADER_TESS_CTRL
:
2822 case MESA_SHADER_TESS_EVAL
:
2823 case MESA_SHADER_GEOMETRY
:
2824 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2825 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2834 case MESA_SHADER_FRAGMENT
:
2835 if (var
->data
.mode
== ir_var_shader_in
) {
2836 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2842 if (var
->data
.mode
== ir_var_shader_out
) {
2843 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2852 case MESA_SHADER_COMPUTE
:
2853 _mesa_glsl_error(loc
, state
,
2854 "compute shader variables cannot be given "
2855 "explicit locations");
2860 _mesa_glsl_error(loc
, state
,
2861 "%s cannot be given an explicit location in %s shader",
2863 _mesa_shader_stage_to_string(state
->stage
));
2865 var
->data
.explicit_location
= true;
2867 switch (state
->stage
) {
2868 case MESA_SHADER_VERTEX
:
2869 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2870 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
2871 : (qual_location
+ VARYING_SLOT_VAR0
);
2874 case MESA_SHADER_TESS_CTRL
:
2875 case MESA_SHADER_TESS_EVAL
:
2876 case MESA_SHADER_GEOMETRY
:
2877 if (var
->data
.patch
)
2878 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
2880 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
2883 case MESA_SHADER_FRAGMENT
:
2884 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2885 ? (qual_location
+ FRAG_RESULT_DATA0
)
2886 : (qual_location
+ VARYING_SLOT_VAR0
);
2888 case MESA_SHADER_COMPUTE
:
2889 assert(!"Unexpected shader type");
2893 /* Check if index was set for the uniform instead of the function */
2894 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
2895 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
2896 "used with subroutine functions");
2900 unsigned qual_index
;
2901 if (qual
->flags
.q
.explicit_index
&&
2902 process_qualifier_constant(state
, loc
, "index", qual
->index
,
2904 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2905 * Layout Qualifiers):
2907 * "It is also a compile-time error if a fragment shader
2908 * sets a layout index to less than 0 or greater than 1."
2910 * Older specifications don't mandate a behavior; we take
2911 * this as a clarification and always generate the error.
2913 if (qual_index
> 1) {
2914 _mesa_glsl_error(loc
, state
,
2915 "explicit index may only be 0 or 1");
2917 var
->data
.explicit_index
= true;
2918 var
->data
.index
= qual_index
;
2925 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2927 struct _mesa_glsl_parse_state
*state
,
2930 const glsl_type
*base_type
= var
->type
->without_array();
2932 if (base_type
->is_image()) {
2933 if (var
->data
.mode
!= ir_var_uniform
&&
2934 var
->data
.mode
!= ir_var_function_in
) {
2935 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2936 "function parameters or uniform-qualified "
2937 "global variables");
2940 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2941 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2942 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2943 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2944 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2945 var
->data
.read_only
= true;
2947 if (qual
->flags
.q
.explicit_image_format
) {
2948 if (var
->data
.mode
== ir_var_function_in
) {
2949 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2950 "used on image function parameters");
2953 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2954 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2955 "base data type of the image");
2958 var
->data
.image_format
= qual
->image_format
;
2960 if (var
->data
.mode
== ir_var_uniform
) {
2961 if (state
->es_shader
) {
2962 _mesa_glsl_error(loc
, state
, "all image uniforms "
2963 "must have a format layout qualifier");
2965 } else if (!qual
->flags
.q
.write_only
) {
2966 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2967 "`writeonly' must have a format layout "
2972 var
->data
.image_format
= GL_NONE
;
2975 /* From page 70 of the GLSL ES 3.1 specification:
2977 * "Except for image variables qualified with the format qualifiers
2978 * r32f, r32i, and r32ui, image variables must specify either memory
2979 * qualifier readonly or the memory qualifier writeonly."
2981 if (state
->es_shader
&&
2982 var
->data
.image_format
!= GL_R32F
&&
2983 var
->data
.image_format
!= GL_R32I
&&
2984 var
->data
.image_format
!= GL_R32UI
&&
2985 !var
->data
.image_read_only
&&
2986 !var
->data
.image_write_only
) {
2987 _mesa_glsl_error(loc
, state
, "image variables of format other than "
2988 "r32f, r32i or r32ui must be qualified `readonly' or "
2992 } else if (qual
->flags
.q
.read_only
||
2993 qual
->flags
.q
.write_only
||
2994 qual
->flags
.q
.coherent
||
2995 qual
->flags
.q
._volatile
||
2996 qual
->flags
.q
.restrict_flag
||
2997 qual
->flags
.q
.explicit_image_format
) {
2998 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3003 static inline const char*
3004 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3006 if (origin_upper_left
&& pixel_center_integer
)
3007 return "origin_upper_left, pixel_center_integer";
3008 else if (origin_upper_left
)
3009 return "origin_upper_left";
3010 else if (pixel_center_integer
)
3011 return "pixel_center_integer";
3017 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3018 const struct ast_type_qualifier
*qual
)
3020 /* If gl_FragCoord was previously declared, and the qualifiers were
3021 * different in any way, return true.
3023 if (state
->fs_redeclares_gl_fragcoord
) {
3024 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3025 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3032 validate_array_dimensions(const glsl_type
*t
,
3033 struct _mesa_glsl_parse_state
*state
,
3035 if (t
->is_array()) {
3036 t
= t
->fields
.array
;
3037 while (t
->is_array()) {
3038 if (t
->is_unsized_array()) {
3039 _mesa_glsl_error(loc
, state
,
3040 "only the outermost array dimension can "
3045 t
= t
->fields
.array
;
3051 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3053 struct _mesa_glsl_parse_state
*state
,
3056 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3058 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3060 * "Within any shader, the first redeclarations of gl_FragCoord
3061 * must appear before any use of gl_FragCoord."
3063 * Generate a compiler error if above condition is not met by the
3066 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3067 if (earlier
!= NULL
&&
3068 earlier
->data
.used
&&
3069 !state
->fs_redeclares_gl_fragcoord
) {
3070 _mesa_glsl_error(loc
, state
,
3071 "gl_FragCoord used before its first redeclaration "
3072 "in fragment shader");
3075 /* Make sure all gl_FragCoord redeclarations specify the same layout
3078 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3079 const char *const qual_string
=
3080 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3081 qual
->flags
.q
.pixel_center_integer
);
3083 const char *const state_string
=
3084 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3085 state
->fs_pixel_center_integer
);
3087 _mesa_glsl_error(loc
, state
,
3088 "gl_FragCoord redeclared with different layout "
3089 "qualifiers (%s) and (%s) ",
3093 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3094 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3095 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3096 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3097 state
->fs_redeclares_gl_fragcoord
=
3098 state
->fs_origin_upper_left
||
3099 state
->fs_pixel_center_integer
||
3100 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3103 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3104 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3105 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3106 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3107 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3108 ? "origin_upper_left" : "pixel_center_integer";
3110 _mesa_glsl_error(loc
, state
,
3111 "layout qualifier `%s' can only be applied to "
3112 "fragment shader input `gl_FragCoord'",
3116 if (qual
->flags
.q
.explicit_location
) {
3117 apply_explicit_location(qual
, var
, state
, loc
);
3118 } else if (qual
->flags
.q
.explicit_index
) {
3119 if (!qual
->flags
.q
.subroutine_def
)
3120 _mesa_glsl_error(loc
, state
,
3121 "explicit index requires explicit location");
3124 if (qual
->flags
.q
.explicit_binding
) {
3125 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3128 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3129 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3130 unsigned qual_stream
;
3131 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3133 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3134 var
->data
.stream
= qual_stream
;
3138 if (var
->type
->contains_atomic()) {
3139 if (var
->data
.mode
== ir_var_uniform
) {
3140 if (var
->data
.explicit_binding
) {
3142 &state
->atomic_counter_offsets
[var
->data
.binding
];
3144 if (*offset
% ATOMIC_COUNTER_SIZE
)
3145 _mesa_glsl_error(loc
, state
,
3146 "misaligned atomic counter offset");
3148 var
->data
.offset
= *offset
;
3149 *offset
+= var
->type
->atomic_size();
3152 _mesa_glsl_error(loc
, state
,
3153 "atomic counters require explicit binding point");
3155 } else if (var
->data
.mode
!= ir_var_function_in
) {
3156 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3157 "function parameters or uniform-qualified "
3158 "global variables");
3162 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3163 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3164 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3165 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3166 * These extensions and all following extensions that add the 'layout'
3167 * keyword have been modified to require the use of 'in' or 'out'.
3169 * The following extension do not allow the deprecated keywords:
3171 * GL_AMD_conservative_depth
3172 * GL_ARB_conservative_depth
3173 * GL_ARB_gpu_shader5
3174 * GL_ARB_separate_shader_objects
3175 * GL_ARB_tessellation_shader
3176 * GL_ARB_transform_feedback3
3177 * GL_ARB_uniform_buffer_object
3179 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3180 * allow layout with the deprecated keywords.
3182 const bool relaxed_layout_qualifier_checking
=
3183 state
->ARB_fragment_coord_conventions_enable
;
3185 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3186 || qual
->flags
.q
.varying
;
3187 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3188 if (relaxed_layout_qualifier_checking
) {
3189 _mesa_glsl_warning(loc
, state
,
3190 "`layout' qualifier may not be used with "
3191 "`attribute' or `varying'");
3193 _mesa_glsl_error(loc
, state
,
3194 "`layout' qualifier may not be used with "
3195 "`attribute' or `varying'");
3199 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3200 * AMD_conservative_depth.
3202 int depth_layout_count
= qual
->flags
.q
.depth_any
3203 + qual
->flags
.q
.depth_greater
3204 + qual
->flags
.q
.depth_less
3205 + qual
->flags
.q
.depth_unchanged
;
3206 if (depth_layout_count
> 0
3207 && !state
->AMD_conservative_depth_enable
3208 && !state
->ARB_conservative_depth_enable
) {
3209 _mesa_glsl_error(loc
, state
,
3210 "extension GL_AMD_conservative_depth or "
3211 "GL_ARB_conservative_depth must be enabled "
3212 "to use depth layout qualifiers");
3213 } else if (depth_layout_count
> 0
3214 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3215 _mesa_glsl_error(loc
, state
,
3216 "depth layout qualifiers can be applied only to "
3218 } else if (depth_layout_count
> 1
3219 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3220 _mesa_glsl_error(loc
, state
,
3221 "at most one depth layout qualifier can be applied to "
3224 if (qual
->flags
.q
.depth_any
)
3225 var
->data
.depth_layout
= ir_depth_layout_any
;
3226 else if (qual
->flags
.q
.depth_greater
)
3227 var
->data
.depth_layout
= ir_depth_layout_greater
;
3228 else if (qual
->flags
.q
.depth_less
)
3229 var
->data
.depth_layout
= ir_depth_layout_less
;
3230 else if (qual
->flags
.q
.depth_unchanged
)
3231 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3233 var
->data
.depth_layout
= ir_depth_layout_none
;
3235 if (qual
->flags
.q
.std140
||
3236 qual
->flags
.q
.std430
||
3237 qual
->flags
.q
.packed
||
3238 qual
->flags
.q
.shared
) {
3239 _mesa_glsl_error(loc
, state
,
3240 "uniform and shader storage block layout qualifiers "
3241 "std140, std430, packed, and shared can only be "
3242 "applied to uniform or shader storage blocks, not "
3246 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3247 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3250 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3253 * "Fragment shaders also allow the following layout qualifier on in only
3254 * (not with variable declarations)
3255 * layout-qualifier-id
3256 * early_fragment_tests
3259 if (qual
->flags
.q
.early_fragment_tests
) {
3260 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3261 "valid in fragment shader input layout declaration.");
3266 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3268 struct _mesa_glsl_parse_state
*state
,
3272 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3274 if (qual
->flags
.q
.invariant
) {
3275 if (var
->data
.used
) {
3276 _mesa_glsl_error(loc
, state
,
3277 "variable `%s' may not be redeclared "
3278 "`invariant' after being used",
3281 var
->data
.invariant
= 1;
3285 if (qual
->flags
.q
.precise
) {
3286 if (var
->data
.used
) {
3287 _mesa_glsl_error(loc
, state
,
3288 "variable `%s' may not be redeclared "
3289 "`precise' after being used",
3292 var
->data
.precise
= 1;
3296 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3297 _mesa_glsl_error(loc
, state
,
3298 "`subroutine' may only be applied to uniforms, "
3299 "subroutine type declarations, or function definitions");
3302 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3303 || qual
->flags
.q
.uniform
3304 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3305 var
->data
.read_only
= 1;
3307 if (qual
->flags
.q
.centroid
)
3308 var
->data
.centroid
= 1;
3310 if (qual
->flags
.q
.sample
)
3311 var
->data
.sample
= 1;
3313 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3314 if (state
->es_shader
) {
3315 var
->data
.precision
=
3316 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3319 if (qual
->flags
.q
.patch
)
3320 var
->data
.patch
= 1;
3322 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3323 var
->type
= glsl_type::error_type
;
3324 _mesa_glsl_error(loc
, state
,
3325 "`attribute' variables may not be declared in the "
3327 _mesa_shader_stage_to_string(state
->stage
));
3330 /* Disallow layout qualifiers which may only appear on layout declarations. */
3331 if (qual
->flags
.q
.prim_type
) {
3332 _mesa_glsl_error(loc
, state
,
3333 "Primitive type may only be specified on GS input or output "
3334 "layout declaration, not on variables.");
3337 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3339 * "However, the const qualifier cannot be used with out or inout."
3341 * The same section of the GLSL 4.40 spec further clarifies this saying:
3343 * "The const qualifier cannot be used with out or inout, or a
3344 * compile-time error results."
3346 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3347 _mesa_glsl_error(loc
, state
,
3348 "`const' may not be applied to `out' or `inout' "
3349 "function parameters");
3352 /* If there is no qualifier that changes the mode of the variable, leave
3353 * the setting alone.
3355 assert(var
->data
.mode
!= ir_var_temporary
);
3356 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3357 var
->data
.mode
= ir_var_function_inout
;
3358 else if (qual
->flags
.q
.in
)
3359 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3360 else if (qual
->flags
.q
.attribute
3361 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3362 var
->data
.mode
= ir_var_shader_in
;
3363 else if (qual
->flags
.q
.out
)
3364 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3365 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3366 var
->data
.mode
= ir_var_shader_out
;
3367 else if (qual
->flags
.q
.uniform
)
3368 var
->data
.mode
= ir_var_uniform
;
3369 else if (qual
->flags
.q
.buffer
)
3370 var
->data
.mode
= ir_var_shader_storage
;
3371 else if (qual
->flags
.q
.shared_storage
)
3372 var
->data
.mode
= ir_var_shader_shared
;
3374 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3375 /* User-defined ins/outs are not permitted in compute shaders. */
3376 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3377 _mesa_glsl_error(loc
, state
,
3378 "user-defined input and output variables are not "
3379 "permitted in compute shaders");
3382 /* This variable is being used to link data between shader stages (in
3383 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3384 * that is allowed for such purposes.
3386 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3388 * "The varying qualifier can be used only with the data types
3389 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3392 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3393 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3395 * "Fragment inputs can only be signed and unsigned integers and
3396 * integer vectors, float, floating-point vectors, matrices, or
3397 * arrays of these. Structures cannot be input.
3399 * Similar text exists in the section on vertex shader outputs.
3401 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3402 * 3.00 spec allows structs as well. Varying structs are also allowed
3405 switch (var
->type
->get_scalar_type()->base_type
) {
3406 case GLSL_TYPE_FLOAT
:
3407 /* Ok in all GLSL versions */
3409 case GLSL_TYPE_UINT
:
3411 if (state
->is_version(130, 300))
3413 _mesa_glsl_error(loc
, state
,
3414 "varying variables must be of base type float in %s",
3415 state
->get_version_string());
3417 case GLSL_TYPE_STRUCT
:
3418 if (state
->is_version(150, 300))
3420 _mesa_glsl_error(loc
, state
,
3421 "varying variables may not be of type struct");
3423 case GLSL_TYPE_DOUBLE
:
3426 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3431 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3432 switch (state
->stage
) {
3433 case MESA_SHADER_VERTEX
:
3434 if (var
->data
.mode
== ir_var_shader_out
)
3435 var
->data
.invariant
= true;
3437 case MESA_SHADER_TESS_CTRL
:
3438 case MESA_SHADER_TESS_EVAL
:
3439 case MESA_SHADER_GEOMETRY
:
3440 if ((var
->data
.mode
== ir_var_shader_in
)
3441 || (var
->data
.mode
== ir_var_shader_out
))
3442 var
->data
.invariant
= true;
3444 case MESA_SHADER_FRAGMENT
:
3445 if (var
->data
.mode
== ir_var_shader_in
)
3446 var
->data
.invariant
= true;
3448 case MESA_SHADER_COMPUTE
:
3449 /* Invariance isn't meaningful in compute shaders. */
3454 var
->data
.interpolation
=
3455 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
3458 /* Does the declaration use the deprecated 'attribute' or 'varying'
3461 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3462 || qual
->flags
.q
.varying
;
3465 /* Validate auxiliary storage qualifiers */
3467 /* From section 4.3.4 of the GLSL 1.30 spec:
3468 * "It is an error to use centroid in in a vertex shader."
3470 * From section 4.3.4 of the GLSL ES 3.00 spec:
3471 * "It is an error to use centroid in or interpolation qualifiers in
3472 * a vertex shader input."
3475 /* Section 4.3.6 of the GLSL 1.30 specification states:
3476 * "It is an error to use centroid out in a fragment shader."
3478 * The GL_ARB_shading_language_420pack extension specification states:
3479 * "It is an error to use auxiliary storage qualifiers or interpolation
3480 * qualifiers on an output in a fragment shader."
3482 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3483 _mesa_glsl_error(loc
, state
,
3484 "sample qualifier may only be used on `in` or `out` "
3485 "variables between shader stages");
3487 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3488 _mesa_glsl_error(loc
, state
,
3489 "centroid qualifier may only be used with `in', "
3490 "`out' or `varying' variables between shader stages");
3493 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3494 _mesa_glsl_error(loc
, state
,
3495 "the shared storage qualifiers can only be used with "
3499 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3503 * Get the variable that is being redeclared by this declaration
3505 * Semantic checks to verify the validity of the redeclaration are also
3506 * performed. If semantic checks fail, compilation error will be emitted via
3507 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3510 * A pointer to an existing variable in the current scope if the declaration
3511 * is a redeclaration, \c NULL otherwise.
3513 static ir_variable
*
3514 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3515 struct _mesa_glsl_parse_state
*state
,
3516 bool allow_all_redeclarations
)
3518 /* Check if this declaration is actually a re-declaration, either to
3519 * resize an array or add qualifiers to an existing variable.
3521 * This is allowed for variables in the current scope, or when at
3522 * global scope (for built-ins in the implicit outer scope).
3524 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3525 if (earlier
== NULL
||
3526 (state
->current_function
!= NULL
&&
3527 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3532 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3534 * "It is legal to declare an array without a size and then
3535 * later re-declare the same name as an array of the same
3536 * type and specify a size."
3538 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3539 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3540 /* FINISHME: This doesn't match the qualifiers on the two
3541 * FINISHME: declarations. It's not 100% clear whether this is
3542 * FINISHME: required or not.
3545 const unsigned size
= unsigned(var
->type
->array_size());
3546 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3547 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3548 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3550 earlier
->data
.max_array_access
);
3553 earlier
->type
= var
->type
;
3556 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3557 state
->is_version(150, 0))
3558 && strcmp(var
->name
, "gl_FragCoord") == 0
3559 && earlier
->type
== var
->type
3560 && var
->data
.mode
== ir_var_shader_in
) {
3561 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3564 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3565 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3567 /* According to section 4.3.7 of the GLSL 1.30 spec,
3568 * the following built-in varaibles can be redeclared with an
3569 * interpolation qualifier:
3572 * * gl_FrontSecondaryColor
3573 * * gl_BackSecondaryColor
3575 * * gl_SecondaryColor
3577 } else if (state
->is_version(130, 0)
3578 && (strcmp(var
->name
, "gl_FrontColor") == 0
3579 || strcmp(var
->name
, "gl_BackColor") == 0
3580 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3581 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3582 || strcmp(var
->name
, "gl_Color") == 0
3583 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3584 && earlier
->type
== var
->type
3585 && earlier
->data
.mode
== var
->data
.mode
) {
3586 earlier
->data
.interpolation
= var
->data
.interpolation
;
3588 /* Layout qualifiers for gl_FragDepth. */
3589 } else if ((state
->AMD_conservative_depth_enable
||
3590 state
->ARB_conservative_depth_enable
)
3591 && strcmp(var
->name
, "gl_FragDepth") == 0
3592 && earlier
->type
== var
->type
3593 && earlier
->data
.mode
== var
->data
.mode
) {
3595 /** From the AMD_conservative_depth spec:
3596 * Within any shader, the first redeclarations of gl_FragDepth
3597 * must appear before any use of gl_FragDepth.
3599 if (earlier
->data
.used
) {
3600 _mesa_glsl_error(&loc
, state
,
3601 "the first redeclaration of gl_FragDepth "
3602 "must appear before any use of gl_FragDepth");
3605 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3606 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3607 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3608 _mesa_glsl_error(&loc
, state
,
3609 "gl_FragDepth: depth layout is declared here "
3610 "as '%s, but it was previously declared as "
3612 depth_layout_string(var
->data
.depth_layout
),
3613 depth_layout_string(earlier
->data
.depth_layout
));
3616 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3618 } else if (allow_all_redeclarations
) {
3619 if (earlier
->data
.mode
!= var
->data
.mode
) {
3620 _mesa_glsl_error(&loc
, state
,
3621 "redeclaration of `%s' with incorrect qualifiers",
3623 } else if (earlier
->type
!= var
->type
) {
3624 _mesa_glsl_error(&loc
, state
,
3625 "redeclaration of `%s' has incorrect type",
3629 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3636 * Generate the IR for an initializer in a variable declaration
3639 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3640 ast_fully_specified_type
*type
,
3641 exec_list
*initializer_instructions
,
3642 struct _mesa_glsl_parse_state
*state
)
3644 ir_rvalue
*result
= NULL
;
3646 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3648 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3650 * "All uniform variables are read-only and are initialized either
3651 * directly by an application via API commands, or indirectly by
3654 if (var
->data
.mode
== ir_var_uniform
) {
3655 state
->check_version(120, 0, &initializer_loc
,
3656 "cannot initialize uniform %s",
3660 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3662 * "Buffer variables cannot have initializers."
3664 if (var
->data
.mode
== ir_var_shader_storage
) {
3665 _mesa_glsl_error(&initializer_loc
, state
,
3666 "cannot initialize buffer variable %s",
3670 /* From section 4.1.7 of the GLSL 4.40 spec:
3672 * "Opaque variables [...] are initialized only through the
3673 * OpenGL API; they cannot be declared with an initializer in a
3676 if (var
->type
->contains_opaque()) {
3677 _mesa_glsl_error(&initializer_loc
, state
,
3678 "cannot initialize opaque variable %s",
3682 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3683 _mesa_glsl_error(&initializer_loc
, state
,
3684 "cannot initialize %s shader input / %s %s",
3685 _mesa_shader_stage_to_string(state
->stage
),
3686 (state
->stage
== MESA_SHADER_VERTEX
)
3687 ? "attribute" : "varying",
3691 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3692 _mesa_glsl_error(&initializer_loc
, state
,
3693 "cannot initialize %s shader output %s",
3694 _mesa_shader_stage_to_string(state
->stage
),
3698 /* If the initializer is an ast_aggregate_initializer, recursively store
3699 * type information from the LHS into it, so that its hir() function can do
3702 if (decl
->initializer
->oper
== ast_aggregate
)
3703 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3705 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3706 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3708 /* Calculate the constant value if this is a const or uniform
3711 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
3713 * "Declarations of globals without a storage qualifier, or with
3714 * just the const qualifier, may include initializers, in which case
3715 * they will be initialized before the first line of main() is
3716 * executed. Such initializers must be a constant expression."
3718 * The same section of the GLSL ES 3.00.4 spec has similar language.
3720 if (type
->qualifier
.flags
.q
.constant
3721 || type
->qualifier
.flags
.q
.uniform
3722 || (state
->es_shader
&& state
->current_function
== NULL
)) {
3723 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3725 if (new_rhs
!= NULL
) {
3728 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
3731 * "A constant expression is one of
3735 * - an expression formed by an operator on operands that are
3736 * all constant expressions, including getting an element of
3737 * a constant array, or a field of a constant structure, or
3738 * components of a constant vector. However, the sequence
3739 * operator ( , ) and the assignment operators ( =, +=, ...)
3740 * are not included in the operators that can create a
3741 * constant expression."
3743 * Section 12.43 (Sequence operator and constant expressions) says:
3745 * "Should the following construct be allowed?
3749 * The expression within the brackets uses the sequence operator
3750 * (',') and returns the integer 3 so the construct is declaring
3751 * a single-dimensional array of size 3. In some languages, the
3752 * construct declares a two-dimensional array. It would be
3753 * preferable to make this construct illegal to avoid confusion.
3755 * One possibility is to change the definition of the sequence
3756 * operator so that it does not return a constant-expression and
3757 * hence cannot be used to declare an array size.
3759 * RESOLUTION: The result of a sequence operator is not a
3760 * constant-expression."
3762 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
3763 * contains language almost identical to the section 4.3.3 in the
3764 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
3767 ir_constant
*constant_value
= rhs
->constant_expression_value();
3768 if (!constant_value
||
3769 (state
->is_version(430, 300) &&
3770 decl
->initializer
->has_sequence_subexpression())) {
3771 const char *const variable_mode
=
3772 (type
->qualifier
.flags
.q
.constant
)
3774 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
3776 /* If ARB_shading_language_420pack is enabled, initializers of
3777 * const-qualified local variables do not have to be constant
3778 * expressions. Const-qualified global variables must still be
3779 * initialized with constant expressions.
3781 if (!state
->has_420pack()
3782 || state
->current_function
== NULL
) {
3783 _mesa_glsl_error(& initializer_loc
, state
,
3784 "initializer of %s variable `%s' must be a "
3785 "constant expression",
3788 if (var
->type
->is_numeric()) {
3789 /* Reduce cascading errors. */
3790 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3791 ? ir_constant::zero(state
, var
->type
) : NULL
;
3795 rhs
= constant_value
;
3796 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3797 ? constant_value
: NULL
;
3800 if (var
->type
->is_numeric()) {
3801 /* Reduce cascading errors. */
3802 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3803 ? ir_constant::zero(state
, var
->type
) : NULL
;
3808 if (rhs
&& !rhs
->type
->is_error()) {
3809 bool temp
= var
->data
.read_only
;
3810 if (type
->qualifier
.flags
.q
.constant
)
3811 var
->data
.read_only
= false;
3813 /* Never emit code to initialize a uniform.
3815 const glsl_type
*initializer_type
;
3816 if (!type
->qualifier
.flags
.q
.uniform
) {
3817 do_assignment(initializer_instructions
, state
,
3822 type
->get_location());
3823 initializer_type
= result
->type
;
3825 initializer_type
= rhs
->type
;
3827 var
->constant_initializer
= rhs
->constant_expression_value();
3828 var
->data
.has_initializer
= true;
3830 /* If the declared variable is an unsized array, it must inherrit
3831 * its full type from the initializer. A declaration such as
3833 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3837 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3839 * The assignment generated in the if-statement (below) will also
3840 * automatically handle this case for non-uniforms.
3842 * If the declared variable is not an array, the types must
3843 * already match exactly. As a result, the type assignment
3844 * here can be done unconditionally. For non-uniforms the call
3845 * to do_assignment can change the type of the initializer (via
3846 * the implicit conversion rules). For uniforms the initializer
3847 * must be a constant expression, and the type of that expression
3848 * was validated above.
3850 var
->type
= initializer_type
;
3852 var
->data
.read_only
= temp
;
3859 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3860 YYLTYPE loc
, ir_variable
*var
,
3861 unsigned num_vertices
,
3863 const char *var_category
)
3865 if (var
->type
->is_unsized_array()) {
3866 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3868 * All geometry shader input unsized array declarations will be
3869 * sized by an earlier input layout qualifier, when present, as per
3870 * the following table.
3872 * Followed by a table mapping each allowed input layout qualifier to
3873 * the corresponding input length.
3875 * Similarly for tessellation control shader outputs.
3877 if (num_vertices
!= 0)
3878 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3881 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3882 * includes the following examples of compile-time errors:
3884 * // code sequence within one shader...
3885 * in vec4 Color1[]; // size unknown
3886 * ...Color1.length()...// illegal, length() unknown
3887 * in vec4 Color2[2]; // size is 2
3888 * ...Color1.length()...// illegal, Color1 still has no size
3889 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3890 * layout(lines) in; // legal, input size is 2, matching
3891 * in vec4 Color4[3]; // illegal, contradicts layout
3894 * To detect the case illustrated by Color3, we verify that the size of
3895 * an explicitly-sized array matches the size of any previously declared
3896 * explicitly-sized array. To detect the case illustrated by Color4, we
3897 * verify that the size of an explicitly-sized array is consistent with
3898 * any previously declared input layout.
3900 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3901 _mesa_glsl_error(&loc
, state
,
3902 "%s size contradicts previously declared layout "
3903 "(size is %u, but layout requires a size of %u)",
3904 var_category
, var
->type
->length
, num_vertices
);
3905 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3906 _mesa_glsl_error(&loc
, state
,
3907 "%s sizes are inconsistent (size is %u, but a "
3908 "previous declaration has size %u)",
3909 var_category
, var
->type
->length
, *size
);
3911 *size
= var
->type
->length
;
3917 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3918 YYLTYPE loc
, ir_variable
*var
)
3920 unsigned num_vertices
= 0;
3922 if (state
->tcs_output_vertices_specified
) {
3923 if (!state
->out_qualifier
->vertices
->
3924 process_qualifier_constant(state
, "vertices",
3925 &num_vertices
, false)) {
3929 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
3930 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
3931 "GL_MAX_PATCH_VERTICES", num_vertices
);
3936 if (!var
->type
->is_array() && !var
->data
.patch
) {
3937 _mesa_glsl_error(&loc
, state
,
3938 "tessellation control shader outputs must be arrays");
3940 /* To avoid cascading failures, short circuit the checks below. */
3944 if (var
->data
.patch
)
3947 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3948 &state
->tcs_output_size
,
3949 "tessellation control shader output");
3953 * Do additional processing necessary for tessellation control/evaluation shader
3954 * input declarations. This covers both interface block arrays and bare input
3958 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3959 YYLTYPE loc
, ir_variable
*var
)
3961 if (!var
->type
->is_array() && !var
->data
.patch
) {
3962 _mesa_glsl_error(&loc
, state
,
3963 "per-vertex tessellation shader inputs must be arrays");
3964 /* Avoid cascading failures. */
3968 if (var
->data
.patch
)
3971 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3972 if (var
->type
->is_unsized_array()) {
3973 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3974 state
->Const
.MaxPatchVertices
);
3980 * Do additional processing necessary for geometry shader input declarations
3981 * (this covers both interface blocks arrays and bare input variables).
3984 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3985 YYLTYPE loc
, ir_variable
*var
)
3987 unsigned num_vertices
= 0;
3989 if (state
->gs_input_prim_type_specified
) {
3990 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3993 /* Geometry shader input variables must be arrays. Caller should have
3994 * reported an error for this.
3996 if (!var
->type
->is_array()) {
3997 assert(state
->error
);
3999 /* To avoid cascading failures, short circuit the checks below. */
4003 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4004 &state
->gs_input_size
,
4005 "geometry shader input");
4009 validate_identifier(const char *identifier
, YYLTYPE loc
,
4010 struct _mesa_glsl_parse_state
*state
)
4012 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4014 * "Identifiers starting with "gl_" are reserved for use by
4015 * OpenGL, and may not be declared in a shader as either a
4016 * variable or a function."
4018 if (is_gl_identifier(identifier
)) {
4019 _mesa_glsl_error(&loc
, state
,
4020 "identifier `%s' uses reserved `gl_' prefix",
4022 } else if (strstr(identifier
, "__")) {
4023 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4026 * "In addition, all identifiers containing two
4027 * consecutive underscores (__) are reserved as
4028 * possible future keywords."
4030 * The intention is that names containing __ are reserved for internal
4031 * use by the implementation, and names prefixed with GL_ are reserved
4032 * for use by Khronos. Names simply containing __ are dangerous to use,
4033 * but should be allowed.
4035 * A future version of the GLSL specification will clarify this.
4037 _mesa_glsl_warning(&loc
, state
,
4038 "identifier `%s' uses reserved `__' string",
4044 ast_declarator_list::hir(exec_list
*instructions
,
4045 struct _mesa_glsl_parse_state
*state
)
4048 const struct glsl_type
*decl_type
;
4049 const char *type_name
= NULL
;
4050 ir_rvalue
*result
= NULL
;
4051 YYLTYPE loc
= this->get_location();
4053 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4055 * "To ensure that a particular output variable is invariant, it is
4056 * necessary to use the invariant qualifier. It can either be used to
4057 * qualify a previously declared variable as being invariant
4059 * invariant gl_Position; // make existing gl_Position be invariant"
4061 * In these cases the parser will set the 'invariant' flag in the declarator
4062 * list, and the type will be NULL.
4064 if (this->invariant
) {
4065 assert(this->type
== NULL
);
4067 if (state
->current_function
!= NULL
) {
4068 _mesa_glsl_error(& loc
, state
,
4069 "all uses of `invariant' keyword must be at global "
4073 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4074 assert(decl
->array_specifier
== NULL
);
4075 assert(decl
->initializer
== NULL
);
4077 ir_variable
*const earlier
=
4078 state
->symbols
->get_variable(decl
->identifier
);
4079 if (earlier
== NULL
) {
4080 _mesa_glsl_error(& loc
, state
,
4081 "undeclared variable `%s' cannot be marked "
4082 "invariant", decl
->identifier
);
4083 } else if (!is_varying_var(earlier
, state
->stage
)) {
4084 _mesa_glsl_error(&loc
, state
,
4085 "`%s' cannot be marked invariant; interfaces between "
4086 "shader stages only.", decl
->identifier
);
4087 } else if (earlier
->data
.used
) {
4088 _mesa_glsl_error(& loc
, state
,
4089 "variable `%s' may not be redeclared "
4090 "`invariant' after being used",
4093 earlier
->data
.invariant
= true;
4097 /* Invariant redeclarations do not have r-values.
4102 if (this->precise
) {
4103 assert(this->type
== NULL
);
4105 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4106 assert(decl
->array_specifier
== NULL
);
4107 assert(decl
->initializer
== NULL
);
4109 ir_variable
*const earlier
=
4110 state
->symbols
->get_variable(decl
->identifier
);
4111 if (earlier
== NULL
) {
4112 _mesa_glsl_error(& loc
, state
,
4113 "undeclared variable `%s' cannot be marked "
4114 "precise", decl
->identifier
);
4115 } else if (state
->current_function
!= NULL
&&
4116 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4117 /* Note: we have to check if we're in a function, since
4118 * builtins are treated as having come from another scope.
4120 _mesa_glsl_error(& loc
, state
,
4121 "variable `%s' from an outer scope may not be "
4122 "redeclared `precise' in this scope",
4124 } else if (earlier
->data
.used
) {
4125 _mesa_glsl_error(& loc
, state
,
4126 "variable `%s' may not be redeclared "
4127 "`precise' after being used",
4130 earlier
->data
.precise
= true;
4134 /* Precise redeclarations do not have r-values either. */
4138 assert(this->type
!= NULL
);
4139 assert(!this->invariant
);
4140 assert(!this->precise
);
4142 /* The type specifier may contain a structure definition. Process that
4143 * before any of the variable declarations.
4145 (void) this->type
->specifier
->hir(instructions
, state
);
4147 decl_type
= this->type
->glsl_type(& type_name
, state
);
4149 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4150 * "Buffer variables may only be declared inside interface blocks
4151 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4152 * shader storage blocks. It is a compile-time error to declare buffer
4153 * variables at global scope (outside a block)."
4155 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4156 _mesa_glsl_error(&loc
, state
,
4157 "buffer variables cannot be declared outside "
4158 "interface blocks");
4161 /* An offset-qualified atomic counter declaration sets the default
4162 * offset for the next declaration within the same atomic counter
4165 if (decl_type
&& decl_type
->contains_atomic()) {
4166 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4167 type
->qualifier
.flags
.q
.explicit_offset
) {
4168 unsigned qual_binding
;
4169 unsigned qual_offset
;
4170 if (process_qualifier_constant(state
, &loc
, "binding",
4171 type
->qualifier
.binding
,
4173 && process_qualifier_constant(state
, &loc
, "offset",
4174 type
->qualifier
.offset
,
4176 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4181 if (this->declarations
.is_empty()) {
4182 /* If there is no structure involved in the program text, there are two
4183 * possible scenarios:
4185 * - The program text contained something like 'vec4;'. This is an
4186 * empty declaration. It is valid but weird. Emit a warning.
4188 * - The program text contained something like 'S;' and 'S' is not the
4189 * name of a known structure type. This is both invalid and weird.
4192 * - The program text contained something like 'mediump float;'
4193 * when the programmer probably meant 'precision mediump
4194 * float;' Emit a warning with a description of what they
4195 * probably meant to do.
4197 * Note that if decl_type is NULL and there is a structure involved,
4198 * there must have been some sort of error with the structure. In this
4199 * case we assume that an error was already generated on this line of
4200 * code for the structure. There is no need to generate an additional,
4203 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4206 if (decl_type
== NULL
) {
4207 _mesa_glsl_error(&loc
, state
,
4208 "invalid type `%s' in empty declaration",
4210 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4211 /* Empty atomic counter declarations are allowed and useful
4212 * to set the default offset qualifier.
4215 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4216 if (this->type
->specifier
->structure
!= NULL
) {
4217 _mesa_glsl_error(&loc
, state
,
4218 "precision qualifiers can't be applied "
4221 static const char *const precision_names
[] = {
4228 _mesa_glsl_warning(&loc
, state
,
4229 "empty declaration with precision qualifier, "
4230 "to set the default precision, use "
4231 "`precision %s %s;'",
4232 precision_names
[this->type
->qualifier
.precision
],
4235 } else if (this->type
->specifier
->structure
== NULL
) {
4236 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4240 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4241 const struct glsl_type
*var_type
;
4243 const char *identifier
= decl
->identifier
;
4244 /* FINISHME: Emit a warning if a variable declaration shadows a
4245 * FINISHME: declaration at a higher scope.
4248 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4249 if (type_name
!= NULL
) {
4250 _mesa_glsl_error(& loc
, state
,
4251 "invalid type `%s' in declaration of `%s'",
4252 type_name
, decl
->identifier
);
4254 _mesa_glsl_error(& loc
, state
,
4255 "invalid type in declaration of `%s'",
4261 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4265 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4267 _mesa_glsl_error(& loc
, state
,
4268 "invalid type in declaration of `%s'",
4270 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4275 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4278 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4280 /* The 'varying in' and 'varying out' qualifiers can only be used with
4281 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4284 if (this->type
->qualifier
.flags
.q
.varying
) {
4285 if (this->type
->qualifier
.flags
.q
.in
) {
4286 _mesa_glsl_error(& loc
, state
,
4287 "`varying in' qualifier in declaration of "
4288 "`%s' only valid for geometry shaders using "
4289 "ARB_geometry_shader4 or EXT_geometry_shader4",
4291 } else if (this->type
->qualifier
.flags
.q
.out
) {
4292 _mesa_glsl_error(& loc
, state
,
4293 "`varying out' qualifier in declaration of "
4294 "`%s' only valid for geometry shaders using "
4295 "ARB_geometry_shader4 or EXT_geometry_shader4",
4300 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4302 * "Global variables can only use the qualifiers const,
4303 * attribute, uniform, or varying. Only one may be
4306 * Local variables can only use the qualifier const."
4308 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4309 * any extension that adds the 'layout' keyword.
4311 if (!state
->is_version(130, 300)
4312 && !state
->has_explicit_attrib_location()
4313 && !state
->has_separate_shader_objects()
4314 && !state
->ARB_fragment_coord_conventions_enable
) {
4315 if (this->type
->qualifier
.flags
.q
.out
) {
4316 _mesa_glsl_error(& loc
, state
,
4317 "`out' qualifier in declaration of `%s' "
4318 "only valid for function parameters in %s",
4319 decl
->identifier
, state
->get_version_string());
4321 if (this->type
->qualifier
.flags
.q
.in
) {
4322 _mesa_glsl_error(& loc
, state
,
4323 "`in' qualifier in declaration of `%s' "
4324 "only valid for function parameters in %s",
4325 decl
->identifier
, state
->get_version_string());
4327 /* FINISHME: Test for other invalid qualifiers. */
4330 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4332 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4335 if (this->type
->qualifier
.flags
.q
.invariant
) {
4336 if (!is_varying_var(var
, state
->stage
)) {
4337 _mesa_glsl_error(&loc
, state
,
4338 "`%s' cannot be marked invariant; interfaces between "
4339 "shader stages only", var
->name
);
4343 if (state
->current_function
!= NULL
) {
4344 const char *mode
= NULL
;
4345 const char *extra
= "";
4347 /* There is no need to check for 'inout' here because the parser will
4348 * only allow that in function parameter lists.
4350 if (this->type
->qualifier
.flags
.q
.attribute
) {
4352 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4353 mode
= "subroutine uniform";
4354 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4356 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4358 } else if (this->type
->qualifier
.flags
.q
.in
) {
4360 extra
= " or in function parameter list";
4361 } else if (this->type
->qualifier
.flags
.q
.out
) {
4363 extra
= " or in function parameter list";
4367 _mesa_glsl_error(& loc
, state
,
4368 "%s variable `%s' must be declared at "
4370 mode
, var
->name
, extra
);
4372 } else if (var
->data
.mode
== ir_var_shader_in
) {
4373 var
->data
.read_only
= true;
4375 if (state
->stage
== MESA_SHADER_VERTEX
) {
4376 bool error_emitted
= false;
4378 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4380 * "Vertex shader inputs can only be float, floating-point
4381 * vectors, matrices, signed and unsigned integers and integer
4382 * vectors. Vertex shader inputs can also form arrays of these
4383 * types, but not structures."
4385 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4387 * "Vertex shader inputs can only be float, floating-point
4388 * vectors, matrices, signed and unsigned integers and integer
4389 * vectors. They cannot be arrays or structures."
4391 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4393 * "The attribute qualifier can be used only with float,
4394 * floating-point vectors, and matrices. Attribute variables
4395 * cannot be declared as arrays or structures."
4397 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4399 * "Vertex shader inputs can only be float, floating-point
4400 * vectors, matrices, signed and unsigned integers and integer
4401 * vectors. Vertex shader inputs cannot be arrays or
4404 const glsl_type
*check_type
= var
->type
->without_array();
4406 switch (check_type
->base_type
) {
4407 case GLSL_TYPE_FLOAT
:
4409 case GLSL_TYPE_UINT
:
4411 if (state
->is_version(120, 300))
4413 case GLSL_TYPE_DOUBLE
:
4414 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4418 _mesa_glsl_error(& loc
, state
,
4419 "vertex shader input / attribute cannot have "
4421 var
->type
->is_array() ? "array of " : "",
4423 error_emitted
= true;
4426 if (!error_emitted
&& var
->type
->is_array() &&
4427 !state
->check_version(150, 0, &loc
,
4428 "vertex shader input / attribute "
4429 "cannot have array type")) {
4430 error_emitted
= true;
4432 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4433 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4435 * Geometry shader input variables get the per-vertex values
4436 * written out by vertex shader output variables of the same
4437 * names. Since a geometry shader operates on a set of
4438 * vertices, each input varying variable (or input block, see
4439 * interface blocks below) needs to be declared as an array.
4441 if (!var
->type
->is_array()) {
4442 _mesa_glsl_error(&loc
, state
,
4443 "geometry shader inputs must be arrays");
4446 handle_geometry_shader_input_decl(state
, loc
, var
);
4447 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4448 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4450 * It is a compile-time error to declare a fragment shader
4451 * input with, or that contains, any of the following types:
4455 * * An array of arrays
4456 * * An array of structures
4457 * * A structure containing an array
4458 * * A structure containing a structure
4460 if (state
->es_shader
) {
4461 const glsl_type
*check_type
= var
->type
->without_array();
4462 if (check_type
->is_boolean() ||
4463 check_type
->contains_opaque()) {
4464 _mesa_glsl_error(&loc
, state
,
4465 "fragment shader input cannot have type %s",
4468 if (var
->type
->is_array() &&
4469 var
->type
->fields
.array
->is_array()) {
4470 _mesa_glsl_error(&loc
, state
,
4472 "cannot have an array of arrays",
4473 _mesa_shader_stage_to_string(state
->stage
));
4475 if (var
->type
->is_array() &&
4476 var
->type
->fields
.array
->is_record()) {
4477 _mesa_glsl_error(&loc
, state
,
4478 "fragment shader input "
4479 "cannot have an array of structs");
4481 if (var
->type
->is_record()) {
4482 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4483 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4484 var
->type
->fields
.structure
[i
].type
->is_record())
4485 _mesa_glsl_error(&loc
, state
,
4486 "fragement shader input cannot have "
4487 "a struct that contains an "
4492 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4493 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4494 handle_tess_shader_input_decl(state
, loc
, var
);
4496 } else if (var
->data
.mode
== ir_var_shader_out
) {
4497 const glsl_type
*check_type
= var
->type
->without_array();
4499 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4501 * It is a compile-time error to declare a vertex, tessellation
4502 * evaluation, tessellation control, or geometry shader output
4503 * that contains any of the following:
4505 * * A Boolean type (bool, bvec2 ...)
4508 if (check_type
->is_boolean() || check_type
->contains_opaque())
4509 _mesa_glsl_error(&loc
, state
,
4510 "%s shader output cannot have type %s",
4511 _mesa_shader_stage_to_string(state
->stage
),
4514 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4516 * It is a compile-time error to declare a fragment shader output
4517 * that contains any of the following:
4519 * * A Boolean type (bool, bvec2 ...)
4520 * * A double-precision scalar or vector (double, dvec2 ...)
4525 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4526 if (check_type
->is_record() || check_type
->is_matrix())
4527 _mesa_glsl_error(&loc
, state
,
4528 "fragment shader output "
4529 "cannot have struct or matrix type");
4530 switch (check_type
->base_type
) {
4531 case GLSL_TYPE_UINT
:
4533 case GLSL_TYPE_FLOAT
:
4536 _mesa_glsl_error(&loc
, state
,
4537 "fragment shader output cannot have "
4538 "type %s", check_type
->name
);
4542 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4544 * It is a compile-time error to declare a vertex shader output
4545 * with, or that contains, any of the following types:
4549 * * An array of arrays
4550 * * An array of structures
4551 * * A structure containing an array
4552 * * A structure containing a structure
4554 * It is a compile-time error to declare a fragment shader output
4555 * with, or that contains, any of the following types:
4561 * * An array of array
4563 if (state
->es_shader
) {
4564 if (var
->type
->is_array() &&
4565 var
->type
->fields
.array
->is_array()) {
4566 _mesa_glsl_error(&loc
, state
,
4568 "cannot have an array of arrays",
4569 _mesa_shader_stage_to_string(state
->stage
));
4571 if (state
->stage
== MESA_SHADER_VERTEX
) {
4572 if (var
->type
->is_array() &&
4573 var
->type
->fields
.array
->is_record()) {
4574 _mesa_glsl_error(&loc
, state
,
4575 "vertex shader output "
4576 "cannot have an array of structs");
4578 if (var
->type
->is_record()) {
4579 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4580 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4581 var
->type
->fields
.structure
[i
].type
->is_record())
4582 _mesa_glsl_error(&loc
, state
,
4583 "vertex shader output cannot have a "
4584 "struct that contains an "
4591 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4592 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4594 } else if (var
->type
->contains_subroutine()) {
4595 /* declare subroutine uniforms as hidden */
4596 var
->data
.how_declared
= ir_var_hidden
;
4599 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4600 * so must integer vertex outputs.
4602 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4603 * "Fragment shader inputs that are signed or unsigned integers or
4604 * integer vectors must be qualified with the interpolation qualifier
4607 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4608 * "Fragment shader inputs that are, or contain, signed or unsigned
4609 * integers or integer vectors must be qualified with the
4610 * interpolation qualifier flat."
4612 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4613 * "Vertex shader outputs that are, or contain, signed or unsigned
4614 * integers or integer vectors must be qualified with the
4615 * interpolation qualifier flat."
4617 * Note that prior to GLSL 1.50, this requirement applied to vertex
4618 * outputs rather than fragment inputs. That creates problems in the
4619 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4620 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4621 * apply the restriction to both vertex outputs and fragment inputs.
4623 * Note also that the desktop GLSL specs are missing the text "or
4624 * contain"; this is presumably an oversight, since there is no
4625 * reasonable way to interpolate a fragment shader input that contains
4628 if (state
->is_version(130, 300) &&
4629 var
->type
->contains_integer() &&
4630 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4631 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4632 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4633 && state
->es_shader
))) {
4634 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4635 "vertex output" : "fragment input";
4636 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4637 "an integer, then it must be qualified with 'flat'",
4641 /* Double fragment inputs must be qualified with 'flat'. */
4642 if (var
->type
->contains_double() &&
4643 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4644 state
->stage
== MESA_SHADER_FRAGMENT
&&
4645 var
->data
.mode
== ir_var_shader_in
) {
4646 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4647 "a double, then it must be qualified with 'flat'",
4651 /* Interpolation qualifiers cannot be applied to 'centroid' and
4652 * 'centroid varying'.
4654 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4655 * "interpolation qualifiers may only precede the qualifiers in,
4656 * centroid in, out, or centroid out in a declaration. They do not apply
4657 * to the deprecated storage qualifiers varying or centroid varying."
4659 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4661 if (state
->is_version(130, 0)
4662 && this->type
->qualifier
.has_interpolation()
4663 && this->type
->qualifier
.flags
.q
.varying
) {
4665 const char *i
= this->type
->qualifier
.interpolation_string();
4668 if (this->type
->qualifier
.flags
.q
.centroid
)
4669 s
= "centroid varying";
4673 _mesa_glsl_error(&loc
, state
,
4674 "qualifier '%s' cannot be applied to the "
4675 "deprecated storage qualifier '%s'", i
, s
);
4679 /* Interpolation qualifiers can only apply to vertex shader outputs and
4680 * fragment shader inputs.
4682 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4683 * "Outputs from a vertex shader (out) and inputs to a fragment
4684 * shader (in) can be further qualified with one or more of these
4685 * interpolation qualifiers"
4687 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4688 * "These interpolation qualifiers may only precede the qualifiers
4689 * in, centroid in, out, or centroid out in a declaration. They do
4690 * not apply to inputs into a vertex shader or outputs from a
4693 if (state
->is_version(130, 300)
4694 && this->type
->qualifier
.has_interpolation()) {
4696 const char *i
= this->type
->qualifier
.interpolation_string();
4699 switch (state
->stage
) {
4700 case MESA_SHADER_VERTEX
:
4701 if (this->type
->qualifier
.flags
.q
.in
) {
4702 _mesa_glsl_error(&loc
, state
,
4703 "qualifier '%s' cannot be applied to vertex "
4704 "shader inputs", i
);
4707 case MESA_SHADER_FRAGMENT
:
4708 if (this->type
->qualifier
.flags
.q
.out
) {
4709 _mesa_glsl_error(&loc
, state
,
4710 "qualifier '%s' cannot be applied to fragment "
4711 "shader outputs", i
);
4720 /* From section 4.3.4 of the GLSL 4.00 spec:
4721 * "Input variables may not be declared using the patch in qualifier
4722 * in tessellation control or geometry shaders."
4724 * From section 4.3.6 of the GLSL 4.00 spec:
4725 * "It is an error to use patch out in a vertex, tessellation
4726 * evaluation, or geometry shader."
4728 * This doesn't explicitly forbid using them in a fragment shader, but
4729 * that's probably just an oversight.
4731 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4732 && this->type
->qualifier
.flags
.q
.patch
4733 && this->type
->qualifier
.flags
.q
.in
) {
4735 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4736 "tessellation evaluation shader");
4739 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4740 && this->type
->qualifier
.flags
.q
.patch
4741 && this->type
->qualifier
.flags
.q
.out
) {
4743 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4744 "tessellation control shader");
4747 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4749 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4750 state
->check_precision_qualifiers_allowed(&loc
);
4754 /* If a precision qualifier is allowed on a type, it is allowed on
4755 * an array of that type.
4757 if (!(this->type
->qualifier
.precision
== ast_precision_none
4758 || precision_qualifier_allowed(var
->type
->without_array()))) {
4760 _mesa_glsl_error(&loc
, state
,
4761 "precision qualifiers apply only to floating point"
4762 ", integer and opaque types");
4765 /* From section 4.1.7 of the GLSL 4.40 spec:
4767 * "[Opaque types] can only be declared as function
4768 * parameters or uniform-qualified variables."
4770 if (var_type
->contains_opaque() &&
4771 !this->type
->qualifier
.flags
.q
.uniform
) {
4772 _mesa_glsl_error(&loc
, state
,
4773 "opaque variables must be declared uniform");
4776 /* Process the initializer and add its instructions to a temporary
4777 * list. This list will be added to the instruction stream (below) after
4778 * the declaration is added. This is done because in some cases (such as
4779 * redeclarations) the declaration may not actually be added to the
4780 * instruction stream.
4782 exec_list initializer_instructions
;
4784 /* Examine var name here since var may get deleted in the next call */
4785 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4787 ir_variable
*earlier
=
4788 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4789 false /* allow_all_redeclarations */);
4790 if (earlier
!= NULL
) {
4792 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4793 _mesa_glsl_error(&loc
, state
,
4794 "`%s' has already been redeclared using "
4795 "gl_PerVertex", earlier
->name
);
4797 earlier
->data
.how_declared
= ir_var_declared_normally
;
4800 if (decl
->initializer
!= NULL
) {
4801 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4803 &initializer_instructions
, state
);
4805 validate_array_dimensions(var_type
, state
, &loc
);
4808 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4810 * "It is an error to write to a const variable outside of
4811 * its declaration, so they must be initialized when
4814 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4815 _mesa_glsl_error(& loc
, state
,
4816 "const declaration of `%s' must be initialized",
4820 if (state
->es_shader
) {
4821 const glsl_type
*const t
= (earlier
== NULL
)
4822 ? var
->type
: earlier
->type
;
4824 if (t
->is_unsized_array())
4825 /* Section 10.17 of the GLSL ES 1.00 specification states that
4826 * unsized array declarations have been removed from the language.
4827 * Arrays that are sized using an initializer are still explicitly
4828 * sized. However, GLSL ES 1.00 does not allow array
4829 * initializers. That is only allowed in GLSL ES 3.00.
4831 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4833 * "An array type can also be formed without specifying a size
4834 * if the definition includes an initializer:
4836 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4837 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4842 _mesa_glsl_error(& loc
, state
,
4843 "unsized array declarations are not allowed in "
4847 /* If the declaration is not a redeclaration, there are a few additional
4848 * semantic checks that must be applied. In addition, variable that was
4849 * created for the declaration should be added to the IR stream.
4851 if (earlier
== NULL
) {
4852 validate_identifier(decl
->identifier
, loc
, state
);
4854 /* Add the variable to the symbol table. Note that the initializer's
4855 * IR was already processed earlier (though it hasn't been emitted
4856 * yet), without the variable in scope.
4858 * This differs from most C-like languages, but it follows the GLSL
4859 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4862 * "Within a declaration, the scope of a name starts immediately
4863 * after the initializer if present or immediately after the name
4864 * being declared if not."
4866 if (!state
->symbols
->add_variable(var
)) {
4867 YYLTYPE loc
= this->get_location();
4868 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4869 "current scope", decl
->identifier
);
4873 /* Push the variable declaration to the top. It means that all the
4874 * variable declarations will appear in a funny last-to-first order,
4875 * but otherwise we run into trouble if a function is prototyped, a
4876 * global var is decled, then the function is defined with usage of
4877 * the global var. See glslparsertest's CorrectModule.frag.
4879 instructions
->push_head(var
);
4882 instructions
->append_list(&initializer_instructions
);
4886 /* Generally, variable declarations do not have r-values. However,
4887 * one is used for the declaration in
4889 * while (bool b = some_condition()) {
4893 * so we return the rvalue from the last seen declaration here.
4900 ast_parameter_declarator::hir(exec_list
*instructions
,
4901 struct _mesa_glsl_parse_state
*state
)
4904 const struct glsl_type
*type
;
4905 const char *name
= NULL
;
4906 YYLTYPE loc
= this->get_location();
4908 type
= this->type
->glsl_type(& name
, state
);
4912 _mesa_glsl_error(& loc
, state
,
4913 "invalid type `%s' in declaration of `%s'",
4914 name
, this->identifier
);
4916 _mesa_glsl_error(& loc
, state
,
4917 "invalid type in declaration of `%s'",
4921 type
= glsl_type::error_type
;
4924 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4926 * "Functions that accept no input arguments need not use void in the
4927 * argument list because prototypes (or definitions) are required and
4928 * therefore there is no ambiguity when an empty argument list "( )" is
4929 * declared. The idiom "(void)" as a parameter list is provided for
4932 * Placing this check here prevents a void parameter being set up
4933 * for a function, which avoids tripping up checks for main taking
4934 * parameters and lookups of an unnamed symbol.
4936 if (type
->is_void()) {
4937 if (this->identifier
!= NULL
)
4938 _mesa_glsl_error(& loc
, state
,
4939 "named parameter cannot have type `void'");
4945 if (formal_parameter
&& (this->identifier
== NULL
)) {
4946 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4950 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4951 * call already handled the "vec4[..] foo" case.
4953 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4955 if (!type
->is_error() && type
->is_unsized_array()) {
4956 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4958 type
= glsl_type::error_type
;
4962 ir_variable
*var
= new(ctx
)
4963 ir_variable(type
, this->identifier
, ir_var_function_in
);
4965 /* Apply any specified qualifiers to the parameter declaration. Note that
4966 * for function parameters the default mode is 'in'.
4968 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
4971 /* From section 4.1.7 of the GLSL 4.40 spec:
4973 * "Opaque variables cannot be treated as l-values; hence cannot
4974 * be used as out or inout function parameters, nor can they be
4977 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4978 && type
->contains_opaque()) {
4979 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
4980 "contain opaque variables");
4981 type
= glsl_type::error_type
;
4984 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
4986 * "When calling a function, expressions that do not evaluate to
4987 * l-values cannot be passed to parameters declared as out or inout."
4989 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
4991 * "Other binary or unary expressions, non-dereferenced arrays,
4992 * function names, swizzles with repeated fields, and constants
4993 * cannot be l-values."
4995 * So for GLSL 1.10, passing an array as an out or inout parameter is not
4996 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
4998 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5000 && !state
->check_version(120, 100, &loc
,
5001 "arrays cannot be out or inout parameters")) {
5002 type
= glsl_type::error_type
;
5005 instructions
->push_tail(var
);
5007 /* Parameter declarations do not have r-values.
5014 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5016 exec_list
*ir_parameters
,
5017 _mesa_glsl_parse_state
*state
)
5019 ast_parameter_declarator
*void_param
= NULL
;
5022 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5023 param
->formal_parameter
= formal
;
5024 param
->hir(ir_parameters
, state
);
5032 if ((void_param
!= NULL
) && (count
> 1)) {
5033 YYLTYPE loc
= void_param
->get_location();
5035 _mesa_glsl_error(& loc
, state
,
5036 "`void' parameter must be only parameter");
5042 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5044 /* IR invariants disallow function declarations or definitions
5045 * nested within other function definitions. But there is no
5046 * requirement about the relative order of function declarations
5047 * and definitions with respect to one another. So simply insert
5048 * the new ir_function block at the end of the toplevel instruction
5051 state
->toplevel_ir
->push_tail(f
);
5056 ast_function::hir(exec_list
*instructions
,
5057 struct _mesa_glsl_parse_state
*state
)
5060 ir_function
*f
= NULL
;
5061 ir_function_signature
*sig
= NULL
;
5062 exec_list hir_parameters
;
5063 YYLTYPE loc
= this->get_location();
5065 const char *const name
= identifier
;
5067 /* New functions are always added to the top-level IR instruction stream,
5068 * so this instruction list pointer is ignored. See also emit_function
5071 (void) instructions
;
5073 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5075 * "Function declarations (prototypes) cannot occur inside of functions;
5076 * they must be at global scope, or for the built-in functions, outside
5077 * the global scope."
5079 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5081 * "User defined functions may only be defined within the global scope."
5083 * Note that this language does not appear in GLSL 1.10.
5085 if ((state
->current_function
!= NULL
) &&
5086 state
->is_version(120, 100)) {
5087 YYLTYPE loc
= this->get_location();
5088 _mesa_glsl_error(&loc
, state
,
5089 "declaration of function `%s' not allowed within "
5090 "function body", name
);
5093 validate_identifier(name
, this->get_location(), state
);
5095 /* Convert the list of function parameters to HIR now so that they can be
5096 * used below to compare this function's signature with previously seen
5097 * signatures for functions with the same name.
5099 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5101 & hir_parameters
, state
);
5103 const char *return_type_name
;
5104 const glsl_type
*return_type
=
5105 this->return_type
->glsl_type(& return_type_name
, state
);
5108 YYLTYPE loc
= this->get_location();
5109 _mesa_glsl_error(&loc
, state
,
5110 "function `%s' has undeclared return type `%s'",
5111 name
, return_type_name
);
5112 return_type
= glsl_type::error_type
;
5115 /* ARB_shader_subroutine states:
5116 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5117 * subroutine(...) to a function declaration."
5119 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5120 YYLTYPE loc
= this->get_location();
5121 _mesa_glsl_error(&loc
, state
,
5122 "function declaration `%s' cannot have subroutine prepended",
5126 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5127 * "No qualifier is allowed on the return type of a function."
5129 if (this->return_type
->has_qualifiers(state
)) {
5130 YYLTYPE loc
= this->get_location();
5131 _mesa_glsl_error(& loc
, state
,
5132 "function `%s' return type has qualifiers", name
);
5135 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5137 * "Arrays are allowed as arguments and as the return type. In both
5138 * cases, the array must be explicitly sized."
5140 if (return_type
->is_unsized_array()) {
5141 YYLTYPE loc
= this->get_location();
5142 _mesa_glsl_error(& loc
, state
,
5143 "function `%s' return type array must be explicitly "
5147 /* From section 4.1.7 of the GLSL 4.40 spec:
5149 * "[Opaque types] can only be declared as function parameters
5150 * or uniform-qualified variables."
5152 if (return_type
->contains_opaque()) {
5153 YYLTYPE loc
= this->get_location();
5154 _mesa_glsl_error(&loc
, state
,
5155 "function `%s' return type can't contain an opaque type",
5159 /* Create an ir_function if one doesn't already exist. */
5160 f
= state
->symbols
->get_function(name
);
5162 f
= new(ctx
) ir_function(name
);
5163 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5164 if (!state
->symbols
->add_function(f
)) {
5165 /* This function name shadows a non-function use of the same name. */
5166 YYLTYPE loc
= this->get_location();
5167 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5168 "non-function", name
);
5172 emit_function(state
, f
);
5175 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5177 * "A shader cannot redefine or overload built-in functions."
5179 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5181 * "User code can overload the built-in functions but cannot redefine
5184 if (state
->es_shader
&& state
->language_version
>= 300) {
5185 /* Local shader has no exact candidates; check the built-ins. */
5186 _mesa_glsl_initialize_builtin_functions();
5187 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5188 YYLTYPE loc
= this->get_location();
5189 _mesa_glsl_error(& loc
, state
,
5190 "A shader cannot redefine or overload built-in "
5191 "function `%s' in GLSL ES 3.00", name
);
5196 /* Verify that this function's signature either doesn't match a previously
5197 * seen signature for a function with the same name, or, if a match is found,
5198 * that the previously seen signature does not have an associated definition.
5200 if (state
->es_shader
|| f
->has_user_signature()) {
5201 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5203 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5204 if (badvar
!= NULL
) {
5205 YYLTYPE loc
= this->get_location();
5207 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5208 "qualifiers don't match prototype", name
, badvar
);
5211 if (sig
->return_type
!= return_type
) {
5212 YYLTYPE loc
= this->get_location();
5214 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5215 "match prototype", name
);
5218 if (sig
->is_defined
) {
5219 if (is_definition
) {
5220 YYLTYPE loc
= this->get_location();
5221 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5223 /* We just encountered a prototype that exactly matches a
5224 * function that's already been defined. This is redundant,
5225 * and we should ignore it.
5233 /* Verify the return type of main() */
5234 if (strcmp(name
, "main") == 0) {
5235 if (! return_type
->is_void()) {
5236 YYLTYPE loc
= this->get_location();
5238 _mesa_glsl_error(& loc
, state
, "main() must return void");
5241 if (!hir_parameters
.is_empty()) {
5242 YYLTYPE loc
= this->get_location();
5244 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5248 /* Finish storing the information about this new function in its signature.
5251 sig
= new(ctx
) ir_function_signature(return_type
);
5252 f
->add_signature(sig
);
5255 sig
->replace_parameters(&hir_parameters
);
5258 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5261 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5262 unsigned qual_index
;
5263 if (process_qualifier_constant(state
, &loc
, "index",
5264 this->return_type
->qualifier
.index
,
5266 if (!state
->has_explicit_uniform_location()) {
5267 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5268 "GL_ARB_explicit_uniform_location or "
5270 } else if (qual_index
>= MAX_SUBROUTINES
) {
5271 _mesa_glsl_error(&loc
, state
,
5272 "invalid subroutine index (%d) index must "
5273 "be a number between 0 and "
5274 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5275 MAX_SUBROUTINES
- 1);
5277 f
->subroutine_index
= qual_index
;
5282 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5283 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5284 f
->num_subroutine_types
);
5286 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5287 const struct glsl_type
*type
;
5288 /* the subroutine type must be already declared */
5289 type
= state
->symbols
->get_type(decl
->identifier
);
5291 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5293 f
->subroutine_types
[idx
++] = type
;
5295 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5297 state
->num_subroutines
+ 1);
5298 state
->subroutines
[state
->num_subroutines
] = f
;
5299 state
->num_subroutines
++;
5303 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5304 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5305 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5308 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5310 state
->num_subroutine_types
+ 1);
5311 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5312 state
->num_subroutine_types
++;
5314 f
->is_subroutine
= true;
5317 /* Function declarations (prototypes) do not have r-values.
5324 ast_function_definition::hir(exec_list
*instructions
,
5325 struct _mesa_glsl_parse_state
*state
)
5327 prototype
->is_definition
= true;
5328 prototype
->hir(instructions
, state
);
5330 ir_function_signature
*signature
= prototype
->signature
;
5331 if (signature
== NULL
)
5334 assert(state
->current_function
== NULL
);
5335 state
->current_function
= signature
;
5336 state
->found_return
= false;
5338 /* Duplicate parameters declared in the prototype as concrete variables.
5339 * Add these to the symbol table.
5341 state
->symbols
->push_scope();
5342 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5343 assert(var
->as_variable() != NULL
);
5345 /* The only way a parameter would "exist" is if two parameters have
5348 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5349 YYLTYPE loc
= this->get_location();
5351 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5353 state
->symbols
->add_variable(var
);
5357 /* Convert the body of the function to HIR. */
5358 this->body
->hir(&signature
->body
, state
);
5359 signature
->is_defined
= true;
5361 state
->symbols
->pop_scope();
5363 assert(state
->current_function
== signature
);
5364 state
->current_function
= NULL
;
5366 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5367 YYLTYPE loc
= this->get_location();
5368 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5369 "%s, but no return statement",
5370 signature
->function_name(),
5371 signature
->return_type
->name
);
5374 /* Function definitions do not have r-values.
5381 ast_jump_statement::hir(exec_list
*instructions
,
5382 struct _mesa_glsl_parse_state
*state
)
5389 assert(state
->current_function
);
5391 if (opt_return_value
) {
5392 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5394 /* The value of the return type can be NULL if the shader says
5395 * 'return foo();' and foo() is a function that returns void.
5397 * NOTE: The GLSL spec doesn't say that this is an error. The type
5398 * of the return value is void. If the return type of the function is
5399 * also void, then this should compile without error. Seriously.
5401 const glsl_type
*const ret_type
=
5402 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5404 /* Implicit conversions are not allowed for return values prior to
5405 * ARB_shading_language_420pack.
5407 if (state
->current_function
->return_type
!= ret_type
) {
5408 YYLTYPE loc
= this->get_location();
5410 if (state
->has_420pack()) {
5411 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5413 _mesa_glsl_error(& loc
, state
,
5414 "could not implicitly convert return value "
5415 "to %s, in function `%s'",
5416 state
->current_function
->return_type
->name
,
5417 state
->current_function
->function_name());
5420 _mesa_glsl_error(& loc
, state
,
5421 "`return' with wrong type %s, in function `%s' "
5424 state
->current_function
->function_name(),
5425 state
->current_function
->return_type
->name
);
5427 } else if (state
->current_function
->return_type
->base_type
==
5429 YYLTYPE loc
= this->get_location();
5431 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5432 * specs add a clarification:
5434 * "A void function can only use return without a return argument, even if
5435 * the return argument has void type. Return statements only accept values:
5438 * void func2() { return func1(); } // illegal return statement"
5440 _mesa_glsl_error(& loc
, state
,
5441 "void functions can only use `return' without a "
5445 inst
= new(ctx
) ir_return(ret
);
5447 if (state
->current_function
->return_type
->base_type
!=
5449 YYLTYPE loc
= this->get_location();
5451 _mesa_glsl_error(& loc
, state
,
5452 "`return' with no value, in function %s returning "
5454 state
->current_function
->function_name());
5456 inst
= new(ctx
) ir_return
;
5459 state
->found_return
= true;
5460 instructions
->push_tail(inst
);
5465 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5466 YYLTYPE loc
= this->get_location();
5468 _mesa_glsl_error(& loc
, state
,
5469 "`discard' may only appear in a fragment shader");
5471 instructions
->push_tail(new(ctx
) ir_discard
);
5476 if (mode
== ast_continue
&&
5477 state
->loop_nesting_ast
== NULL
) {
5478 YYLTYPE loc
= this->get_location();
5480 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5481 } else if (mode
== ast_break
&&
5482 state
->loop_nesting_ast
== NULL
&&
5483 state
->switch_state
.switch_nesting_ast
== NULL
) {
5484 YYLTYPE loc
= this->get_location();
5486 _mesa_glsl_error(& loc
, state
,
5487 "break may only appear in a loop or a switch");
5489 /* For a loop, inline the for loop expression again, since we don't
5490 * know where near the end of the loop body the normal copy of it is
5491 * going to be placed. Same goes for the condition for a do-while
5494 if (state
->loop_nesting_ast
!= NULL
&&
5495 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5496 if (state
->loop_nesting_ast
->rest_expression
) {
5497 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5500 if (state
->loop_nesting_ast
->mode
==
5501 ast_iteration_statement::ast_do_while
) {
5502 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5506 if (state
->switch_state
.is_switch_innermost
&&
5507 mode
== ast_continue
) {
5508 /* Set 'continue_inside' to true. */
5509 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5510 ir_dereference_variable
*deref_continue_inside_var
=
5511 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5512 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5515 /* Break out from the switch, continue for the loop will
5516 * be called right after switch. */
5517 ir_loop_jump
*const jump
=
5518 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5519 instructions
->push_tail(jump
);
5521 } else if (state
->switch_state
.is_switch_innermost
&&
5522 mode
== ast_break
) {
5523 /* Force break out of switch by inserting a break. */
5524 ir_loop_jump
*const jump
=
5525 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5526 instructions
->push_tail(jump
);
5528 ir_loop_jump
*const jump
=
5529 new(ctx
) ir_loop_jump((mode
== ast_break
)
5530 ? ir_loop_jump::jump_break
5531 : ir_loop_jump::jump_continue
);
5532 instructions
->push_tail(jump
);
5539 /* Jump instructions do not have r-values.
5546 ast_selection_statement::hir(exec_list
*instructions
,
5547 struct _mesa_glsl_parse_state
*state
)
5551 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5553 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5555 * "Any expression whose type evaluates to a Boolean can be used as the
5556 * conditional expression bool-expression. Vector types are not accepted
5557 * as the expression to if."
5559 * The checks are separated so that higher quality diagnostics can be
5560 * generated for cases where both rules are violated.
5562 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5563 YYLTYPE loc
= this->condition
->get_location();
5565 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5569 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5571 if (then_statement
!= NULL
) {
5572 state
->symbols
->push_scope();
5573 then_statement
->hir(& stmt
->then_instructions
, state
);
5574 state
->symbols
->pop_scope();
5577 if (else_statement
!= NULL
) {
5578 state
->symbols
->push_scope();
5579 else_statement
->hir(& stmt
->else_instructions
, state
);
5580 state
->symbols
->pop_scope();
5583 instructions
->push_tail(stmt
);
5585 /* if-statements do not have r-values.
5592 ast_switch_statement::hir(exec_list
*instructions
,
5593 struct _mesa_glsl_parse_state
*state
)
5597 ir_rvalue
*const test_expression
=
5598 this->test_expression
->hir(instructions
, state
);
5600 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5602 * "The type of init-expression in a switch statement must be a
5605 if (!test_expression
->type
->is_scalar() ||
5606 !test_expression
->type
->is_integer()) {
5607 YYLTYPE loc
= this->test_expression
->get_location();
5609 _mesa_glsl_error(& loc
,
5611 "switch-statement expression must be scalar "
5615 /* Track the switch-statement nesting in a stack-like manner.
5617 struct glsl_switch_state saved
= state
->switch_state
;
5619 state
->switch_state
.is_switch_innermost
= true;
5620 state
->switch_state
.switch_nesting_ast
= this;
5621 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5622 hash_table_pointer_compare
);
5623 state
->switch_state
.previous_default
= NULL
;
5625 /* Initalize is_fallthru state to false.
5627 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5628 state
->switch_state
.is_fallthru_var
=
5629 new(ctx
) ir_variable(glsl_type::bool_type
,
5630 "switch_is_fallthru_tmp",
5632 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5634 ir_dereference_variable
*deref_is_fallthru_var
=
5635 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5636 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5639 /* Initialize continue_inside state to false.
5641 state
->switch_state
.continue_inside
=
5642 new(ctx
) ir_variable(glsl_type::bool_type
,
5643 "continue_inside_tmp",
5645 instructions
->push_tail(state
->switch_state
.continue_inside
);
5647 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5648 ir_dereference_variable
*deref_continue_inside_var
=
5649 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5650 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5653 state
->switch_state
.run_default
=
5654 new(ctx
) ir_variable(glsl_type::bool_type
,
5657 instructions
->push_tail(state
->switch_state
.run_default
);
5659 /* Loop around the switch is used for flow control. */
5660 ir_loop
* loop
= new(ctx
) ir_loop();
5661 instructions
->push_tail(loop
);
5663 /* Cache test expression.
5665 test_to_hir(&loop
->body_instructions
, state
);
5667 /* Emit code for body of switch stmt.
5669 body
->hir(&loop
->body_instructions
, state
);
5671 /* Insert a break at the end to exit loop. */
5672 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5673 loop
->body_instructions
.push_tail(jump
);
5675 /* If we are inside loop, check if continue got called inside switch. */
5676 if (state
->loop_nesting_ast
!= NULL
) {
5677 ir_dereference_variable
*deref_continue_inside
=
5678 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5679 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5680 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5682 if (state
->loop_nesting_ast
!= NULL
) {
5683 if (state
->loop_nesting_ast
->rest_expression
) {
5684 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5687 if (state
->loop_nesting_ast
->mode
==
5688 ast_iteration_statement::ast_do_while
) {
5689 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5692 irif
->then_instructions
.push_tail(jump
);
5693 instructions
->push_tail(irif
);
5696 hash_table_dtor(state
->switch_state
.labels_ht
);
5698 state
->switch_state
= saved
;
5700 /* Switch statements do not have r-values. */
5706 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5707 struct _mesa_glsl_parse_state
*state
)
5711 /* Cache value of test expression. */
5712 ir_rvalue
*const test_val
=
5713 test_expression
->hir(instructions
,
5716 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5719 ir_dereference_variable
*deref_test_var
=
5720 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5722 instructions
->push_tail(state
->switch_state
.test_var
);
5723 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5728 ast_switch_body::hir(exec_list
*instructions
,
5729 struct _mesa_glsl_parse_state
*state
)
5732 stmts
->hir(instructions
, state
);
5734 /* Switch bodies do not have r-values. */
5739 ast_case_statement_list::hir(exec_list
*instructions
,
5740 struct _mesa_glsl_parse_state
*state
)
5742 exec_list default_case
, after_default
, tmp
;
5744 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5745 case_stmt
->hir(&tmp
, state
);
5748 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5749 default_case
.append_list(&tmp
);
5753 /* If default case found, append 'after_default' list. */
5754 if (!default_case
.is_empty())
5755 after_default
.append_list(&tmp
);
5757 instructions
->append_list(&tmp
);
5760 /* Handle the default case. This is done here because default might not be
5761 * the last case. We need to add checks against following cases first to see
5762 * if default should be chosen or not.
5764 if (!default_case
.is_empty()) {
5766 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5767 ir_dereference_variable
*deref_run_default_var
=
5768 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5770 /* Choose to run default case initially, following conditional
5771 * assignments might change this.
5773 ir_assignment
*const init_var
=
5774 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5775 instructions
->push_tail(init_var
);
5777 /* Default case was the last one, no checks required. */
5778 if (after_default
.is_empty()) {
5779 instructions
->append_list(&default_case
);
5783 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5784 ir_assignment
*assign
= ir
->as_assignment();
5789 /* Clone the check between case label and init expression. */
5790 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5791 ir_expression
*clone
= exp
->clone(state
, NULL
);
5793 ir_dereference_variable
*deref_var
=
5794 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5795 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5797 ir_assignment
*const set_false
=
5798 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5800 instructions
->push_tail(set_false
);
5803 /* Append default case and all cases after it. */
5804 instructions
->append_list(&default_case
);
5805 instructions
->append_list(&after_default
);
5808 /* Case statements do not have r-values. */
5813 ast_case_statement::hir(exec_list
*instructions
,
5814 struct _mesa_glsl_parse_state
*state
)
5816 labels
->hir(instructions
, state
);
5818 /* Guard case statements depending on fallthru state. */
5819 ir_dereference_variable
*const deref_fallthru_guard
=
5820 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5821 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5823 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5824 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5826 instructions
->push_tail(test_fallthru
);
5828 /* Case statements do not have r-values. */
5834 ast_case_label_list::hir(exec_list
*instructions
,
5835 struct _mesa_glsl_parse_state
*state
)
5837 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5838 label
->hir(instructions
, state
);
5840 /* Case labels do not have r-values. */
5845 ast_case_label::hir(exec_list
*instructions
,
5846 struct _mesa_glsl_parse_state
*state
)
5850 ir_dereference_variable
*deref_fallthru_var
=
5851 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5853 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5855 /* If not default case, ... */
5856 if (this->test_value
!= NULL
) {
5857 /* Conditionally set fallthru state based on
5858 * comparison of cached test expression value to case label.
5860 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5861 ir_constant
*label_const
= label_rval
->constant_expression_value();
5864 YYLTYPE loc
= this->test_value
->get_location();
5866 _mesa_glsl_error(& loc
, state
,
5867 "switch statement case label must be a "
5868 "constant expression");
5870 /* Stuff a dummy value in to allow processing to continue. */
5871 label_const
= new(ctx
) ir_constant(0);
5873 ast_expression
*previous_label
= (ast_expression
*)
5874 hash_table_find(state
->switch_state
.labels_ht
,
5875 (void *)(uintptr_t)label_const
->value
.u
[0]);
5877 if (previous_label
) {
5878 YYLTYPE loc
= this->test_value
->get_location();
5879 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5881 loc
= previous_label
->get_location();
5882 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5884 hash_table_insert(state
->switch_state
.labels_ht
,
5886 (void *)(uintptr_t)label_const
->value
.u
[0]);
5890 ir_dereference_variable
*deref_test_var
=
5891 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5893 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5898 * From GLSL 4.40 specification section 6.2 ("Selection"):
5900 * "The type of the init-expression value in a switch statement must
5901 * be a scalar int or uint. The type of the constant-expression value
5902 * in a case label also must be a scalar int or uint. When any pair
5903 * of these values is tested for "equal value" and the types do not
5904 * match, an implicit conversion will be done to convert the int to a
5905 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5908 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5909 YYLTYPE loc
= this->test_value
->get_location();
5911 const glsl_type
*type_a
= label_const
->type
;
5912 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5914 /* Check if int->uint implicit conversion is supported. */
5915 bool integer_conversion_supported
=
5916 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5919 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5920 !integer_conversion_supported
) {
5921 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5922 "init-expression and case label (%s != %s)",
5923 type_a
->name
, type_b
->name
);
5925 /* Conversion of the case label. */
5926 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5927 if (!apply_implicit_conversion(glsl_type::uint_type
,
5928 test_cond
->operands
[0], state
))
5929 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5931 /* Conversion of the init-expression value. */
5932 if (!apply_implicit_conversion(glsl_type::uint_type
,
5933 test_cond
->operands
[1], state
))
5934 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5939 ir_assignment
*set_fallthru_on_test
=
5940 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5942 instructions
->push_tail(set_fallthru_on_test
);
5943 } else { /* default case */
5944 if (state
->switch_state
.previous_default
) {
5945 YYLTYPE loc
= this->get_location();
5946 _mesa_glsl_error(& loc
, state
,
5947 "multiple default labels in one switch");
5949 loc
= state
->switch_state
.previous_default
->get_location();
5950 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5952 state
->switch_state
.previous_default
= this;
5954 /* Set fallthru condition on 'run_default' bool. */
5955 ir_dereference_variable
*deref_run_default
=
5956 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5957 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5958 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5962 /* Set falltrhu state. */
5963 ir_assignment
*set_fallthru
=
5964 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5966 instructions
->push_tail(set_fallthru
);
5969 /* Case statements do not have r-values. */
5974 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
5975 struct _mesa_glsl_parse_state
*state
)
5979 if (condition
!= NULL
) {
5980 ir_rvalue
*const cond
=
5981 condition
->hir(instructions
, state
);
5984 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
5985 YYLTYPE loc
= condition
->get_location();
5987 _mesa_glsl_error(& loc
, state
,
5988 "loop condition must be scalar boolean");
5990 /* As the first code in the loop body, generate a block that looks
5991 * like 'if (!condition) break;' as the loop termination condition.
5993 ir_rvalue
*const not_cond
=
5994 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
5996 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
5998 ir_jump
*const break_stmt
=
5999 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6001 if_stmt
->then_instructions
.push_tail(break_stmt
);
6002 instructions
->push_tail(if_stmt
);
6009 ast_iteration_statement::hir(exec_list
*instructions
,
6010 struct _mesa_glsl_parse_state
*state
)
6014 /* For-loops and while-loops start a new scope, but do-while loops do not.
6016 if (mode
!= ast_do_while
)
6017 state
->symbols
->push_scope();
6019 if (init_statement
!= NULL
)
6020 init_statement
->hir(instructions
, state
);
6022 ir_loop
*const stmt
= new(ctx
) ir_loop();
6023 instructions
->push_tail(stmt
);
6025 /* Track the current loop nesting. */
6026 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6028 state
->loop_nesting_ast
= this;
6030 /* Likewise, indicate that following code is closest to a loop,
6031 * NOT closest to a switch.
6033 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6034 state
->switch_state
.is_switch_innermost
= false;
6036 if (mode
!= ast_do_while
)
6037 condition_to_hir(&stmt
->body_instructions
, state
);
6040 body
->hir(& stmt
->body_instructions
, state
);
6042 if (rest_expression
!= NULL
)
6043 rest_expression
->hir(& stmt
->body_instructions
, state
);
6045 if (mode
== ast_do_while
)
6046 condition_to_hir(&stmt
->body_instructions
, state
);
6048 if (mode
!= ast_do_while
)
6049 state
->symbols
->pop_scope();
6051 /* Restore previous nesting before returning. */
6052 state
->loop_nesting_ast
= nesting_ast
;
6053 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6055 /* Loops do not have r-values.
6062 * Determine if the given type is valid for establishing a default precision
6065 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6067 * "The precision statement
6069 * precision precision-qualifier type;
6071 * can be used to establish a default precision qualifier. The type field
6072 * can be either int or float or any of the sampler types, and the
6073 * precision-qualifier can be lowp, mediump, or highp."
6075 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6076 * qualifiers on sampler types, but this seems like an oversight (since the
6077 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6078 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6082 is_valid_default_precision_type(const struct glsl_type
*const type
)
6087 switch (type
->base_type
) {
6089 case GLSL_TYPE_FLOAT
:
6090 /* "int" and "float" are valid, but vectors and matrices are not. */
6091 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6092 case GLSL_TYPE_SAMPLER
:
6093 case GLSL_TYPE_IMAGE
:
6094 case GLSL_TYPE_ATOMIC_UINT
:
6103 ast_type_specifier::hir(exec_list
*instructions
,
6104 struct _mesa_glsl_parse_state
*state
)
6106 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6109 YYLTYPE loc
= this->get_location();
6111 /* If this is a precision statement, check that the type to which it is
6112 * applied is either float or int.
6114 * From section 4.5.3 of the GLSL 1.30 spec:
6115 * "The precision statement
6116 * precision precision-qualifier type;
6117 * can be used to establish a default precision qualifier. The type
6118 * field can be either int or float [...]. Any other types or
6119 * qualifiers will result in an error.
6121 if (this->default_precision
!= ast_precision_none
) {
6122 if (!state
->check_precision_qualifiers_allowed(&loc
))
6125 if (this->structure
!= NULL
) {
6126 _mesa_glsl_error(&loc
, state
,
6127 "precision qualifiers do not apply to structures");
6131 if (this->array_specifier
!= NULL
) {
6132 _mesa_glsl_error(&loc
, state
,
6133 "default precision statements do not apply to "
6138 const struct glsl_type
*const type
=
6139 state
->symbols
->get_type(this->type_name
);
6140 if (!is_valid_default_precision_type(type
)) {
6141 _mesa_glsl_error(&loc
, state
,
6142 "default precision statements apply only to "
6143 "float, int, and opaque types");
6147 if (state
->es_shader
) {
6148 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6151 * "Non-precision qualified declarations will use the precision
6152 * qualifier specified in the most recent precision statement
6153 * that is still in scope. The precision statement has the same
6154 * scoping rules as variable declarations. If it is declared
6155 * inside a compound statement, its effect stops at the end of
6156 * the innermost statement it was declared in. Precision
6157 * statements in nested scopes override precision statements in
6158 * outer scopes. Multiple precision statements for the same basic
6159 * type can appear inside the same scope, with later statements
6160 * overriding earlier statements within that scope."
6162 * Default precision specifications follow the same scope rules as
6163 * variables. So, we can track the state of the default precision
6164 * qualifiers in the symbol table, and the rules will just work. This
6165 * is a slight abuse of the symbol table, but it has the semantics
6168 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6169 this->default_precision
);
6172 /* FINISHME: Translate precision statements into IR. */
6176 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6177 * process_record_constructor() can do type-checking on C-style initializer
6178 * expressions of structs, but ast_struct_specifier should only be translated
6179 * to HIR if it is declaring the type of a structure.
6181 * The ->is_declaration field is false for initializers of variables
6182 * declared separately from the struct's type definition.
6184 * struct S { ... }; (is_declaration = true)
6185 * struct T { ... } t = { ... }; (is_declaration = true)
6186 * S s = { ... }; (is_declaration = false)
6188 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6189 return this->structure
->hir(instructions
, state
);
6196 * Process a structure or interface block tree into an array of structure fields
6198 * After parsing, where there are some syntax differnces, structures and
6199 * interface blocks are almost identical. They are similar enough that the
6200 * AST for each can be processed the same way into a set of
6201 * \c glsl_struct_field to describe the members.
6203 * If we're processing an interface block, var_mode should be the type of the
6204 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6205 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6209 * The number of fields processed. A pointer to the array structure fields is
6210 * stored in \c *fields_ret.
6213 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6214 struct _mesa_glsl_parse_state
*state
,
6215 exec_list
*declarations
,
6216 glsl_struct_field
**fields_ret
,
6218 enum glsl_matrix_layout matrix_layout
,
6219 bool allow_reserved_names
,
6220 ir_variable_mode var_mode
,
6221 ast_type_qualifier
*layout
,
6222 unsigned block_stream
,
6223 unsigned expl_location
)
6225 unsigned decl_count
= 0;
6227 /* Make an initial pass over the list of fields to determine how
6228 * many there are. Each element in this list is an ast_declarator_list.
6229 * This means that we actually need to count the number of elements in the
6230 * 'declarations' list in each of the elements.
6232 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6233 decl_count
+= decl_list
->declarations
.length();
6236 /* Allocate storage for the fields and process the field
6237 * declarations. As the declarations are processed, try to also convert
6238 * the types to HIR. This ensures that structure definitions embedded in
6239 * other structure definitions or in interface blocks are processed.
6241 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6244 bool first_member
= true;
6245 bool first_member_has_explicit_location
;
6248 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6249 const char *type_name
;
6250 YYLTYPE loc
= decl_list
->get_location();
6252 decl_list
->type
->specifier
->hir(instructions
, state
);
6254 /* Section 10.9 of the GLSL ES 1.00 specification states that
6255 * embedded structure definitions have been removed from the language.
6257 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
6258 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
6259 "not allowed in GLSL ES 1.00");
6262 const glsl_type
*decl_type
=
6263 decl_list
->type
->glsl_type(& type_name
, state
);
6265 const struct ast_type_qualifier
*const qual
=
6266 &decl_list
->type
->qualifier
;
6268 /* From section 4.3.9 of the GLSL 4.40 spec:
6270 * "[In interface blocks] opaque types are not allowed."
6272 * It should be impossible for decl_type to be NULL here. Cases that
6273 * might naturally lead to decl_type being NULL, especially for the
6274 * is_interface case, will have resulted in compilation having
6275 * already halted due to a syntax error.
6279 if (is_interface
&& decl_type
->contains_opaque()) {
6280 _mesa_glsl_error(&loc
, state
,
6281 "uniform/buffer in non-default interface block contains "
6285 if (decl_type
->contains_atomic()) {
6286 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6288 * "Members of structures cannot be declared as atomic counter
6291 _mesa_glsl_error(&loc
, state
, "atomic counter in structure, "
6292 "shader storage block or uniform block");
6295 if (decl_type
->contains_image()) {
6296 /* FINISHME: Same problem as with atomic counters.
6297 * FINISHME: Request clarification from Khronos and add
6298 * FINISHME: spec quotation here.
6300 _mesa_glsl_error(&loc
, state
,
6301 "image in structure, shader storage block or "
6305 if (qual
->flags
.q
.explicit_binding
) {
6306 _mesa_glsl_error(&loc
, state
,
6307 "binding layout qualifier cannot be applied "
6308 "to struct or interface block members");
6312 if (!first_member
) {
6313 if (!layout
->flags
.q
.explicit_location
&&
6314 ((first_member_has_explicit_location
&&
6315 !qual
->flags
.q
.explicit_location
) ||
6316 (!first_member_has_explicit_location
&&
6317 qual
->flags
.q
.explicit_location
))) {
6318 _mesa_glsl_error(&loc
, state
,
6319 "when block-level location layout qualifier "
6320 "is not supplied either all members must "
6321 "have a location layout qualifier or all "
6322 "members must not have a location layout "
6326 first_member
= false;
6327 first_member_has_explicit_location
=
6328 qual
->flags
.q
.explicit_location
;
6332 if (qual
->flags
.q
.std140
||
6333 qual
->flags
.q
.std430
||
6334 qual
->flags
.q
.packed
||
6335 qual
->flags
.q
.shared
) {
6336 _mesa_glsl_error(&loc
, state
,
6337 "uniform/shader storage block layout qualifiers "
6338 "std140, std430, packed, and shared can only be "
6339 "applied to uniform/shader storage blocks, not "
6343 if (qual
->flags
.q
.constant
) {
6344 _mesa_glsl_error(&loc
, state
,
6345 "const storage qualifier cannot be applied "
6346 "to struct or interface block members");
6349 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6351 * "A block member may be declared with a stream identifier, but
6352 * the specified stream must match the stream associated with the
6353 * containing block."
6355 if (qual
->flags
.q
.explicit_stream
) {
6356 unsigned qual_stream
;
6357 if (process_qualifier_constant(state
, &loc
, "stream",
6358 qual
->stream
, &qual_stream
) &&
6359 qual_stream
!= block_stream
) {
6360 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6361 "interface block member does not match "
6362 "the interface block (%u vs %u)", qual_stream
,
6367 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6368 _mesa_glsl_error(&loc
, state
,
6369 "interpolation qualifiers cannot be used "
6370 "with uniform interface blocks");
6373 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6374 qual
->has_auxiliary_storage()) {
6375 _mesa_glsl_error(&loc
, state
,
6376 "auxiliary storage qualifiers cannot be used "
6377 "in uniform blocks or structures.");
6380 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6381 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6382 _mesa_glsl_error(&loc
, state
,
6383 "row_major and column_major can only be "
6384 "applied to interface blocks");
6386 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6389 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6390 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6391 "readonly and writeonly.");
6394 foreach_list_typed (ast_declaration
, decl
, link
,
6395 &decl_list
->declarations
) {
6396 YYLTYPE loc
= decl
->get_location();
6398 if (!allow_reserved_names
)
6399 validate_identifier(decl
->identifier
, loc
, state
);
6401 const struct glsl_type
*field_type
=
6402 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6403 validate_array_dimensions(field_type
, state
, &loc
);
6404 fields
[i
].type
= field_type
;
6405 fields
[i
].name
= decl
->identifier
;
6406 fields
[i
].interpolation
=
6407 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
6408 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6409 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6410 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6411 fields
[i
].precision
= qual
->precision
;
6413 if (qual
->flags
.q
.explicit_location
) {
6414 unsigned qual_location
;
6415 if (process_qualifier_constant(state
, &loc
, "location",
6416 qual
->location
, &qual_location
)) {
6417 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6418 expl_location
= fields
[i
].location
+
6419 fields
[i
].type
->count_attribute_slots(false);
6422 if (layout
&& layout
->flags
.q
.explicit_location
) {
6423 fields
[i
].location
= expl_location
;
6424 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6426 fields
[i
].location
= -1;
6430 /* Propogate row- / column-major information down the fields of the
6431 * structure or interface block. Structures need this data because
6432 * the structure may contain a structure that contains ... a matrix
6433 * that need the proper layout.
6435 if (field_type
->without_array()->is_matrix()
6436 || field_type
->without_array()->is_record()) {
6437 /* If no layout is specified for the field, inherit the layout
6440 fields
[i
].matrix_layout
= matrix_layout
;
6442 if (qual
->flags
.q
.row_major
)
6443 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6444 else if (qual
->flags
.q
.column_major
)
6445 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6447 /* If we're processing an interface block, the matrix layout must
6448 * be decided by this point.
6450 assert(!is_interface
6451 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6452 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6455 /* Image qualifiers are allowed on buffer variables, which can only
6456 * be defined inside shader storage buffer objects
6458 if (layout
&& var_mode
== ir_var_shader_storage
) {
6459 /* For readonly and writeonly qualifiers the field definition,
6460 * if set, overwrites the layout qualifier.
6462 if (qual
->flags
.q
.read_only
) {
6463 fields
[i
].image_read_only
= true;
6464 fields
[i
].image_write_only
= false;
6465 } else if (qual
->flags
.q
.write_only
) {
6466 fields
[i
].image_read_only
= false;
6467 fields
[i
].image_write_only
= true;
6469 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6470 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6473 /* For other qualifiers, we set the flag if either the layout
6474 * qualifier or the field qualifier are set
6476 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6477 layout
->flags
.q
.coherent
;
6478 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6479 layout
->flags
.q
._volatile
;
6480 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6481 layout
->flags
.q
.restrict_flag
;
6488 assert(i
== decl_count
);
6490 *fields_ret
= fields
;
6496 ast_struct_specifier::hir(exec_list
*instructions
,
6497 struct _mesa_glsl_parse_state
*state
)
6499 YYLTYPE loc
= this->get_location();
6501 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6503 * "Anonymous structures are not supported; so embedded structures must
6504 * have a declarator. A name given to an embedded struct is scoped at
6505 * the same level as the struct it is embedded in."
6507 * The same section of the GLSL 1.20 spec says:
6509 * "Anonymous structures are not supported. Embedded structures are not
6512 * struct S { float f; };
6514 * S; // Error: anonymous structures disallowed
6515 * struct { ... }; // Error: embedded structures disallowed
6516 * S s; // Okay: nested structures with name are allowed
6519 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
6520 * we allow embedded structures in 1.10 only.
6522 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
6523 _mesa_glsl_error(&loc
, state
,
6524 "embedded structure declarations are not allowed");
6526 state
->struct_specifier_depth
++;
6528 unsigned expl_location
= 0;
6529 if (layout
&& layout
->flags
.q
.explicit_location
) {
6530 if (!process_qualifier_constant(state
, &loc
, "location",
6531 layout
->location
, &expl_location
)) {
6534 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6538 glsl_struct_field
*fields
;
6539 unsigned decl_count
=
6540 ast_process_struct_or_iface_block_members(instructions
,
6542 &this->declarations
,
6545 GLSL_MATRIX_LAYOUT_INHERITED
,
6546 false /* allow_reserved_names */,
6549 0, /* for interface only */
6552 validate_identifier(this->name
, loc
, state
);
6554 const glsl_type
*t
=
6555 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6557 if (!state
->symbols
->add_type(name
, t
)) {
6558 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6560 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6562 state
->num_user_structures
+ 1);
6564 s
[state
->num_user_structures
] = t
;
6565 state
->user_structures
= s
;
6566 state
->num_user_structures
++;
6570 state
->struct_specifier_depth
--;
6572 /* Structure type definitions do not have r-values.
6579 * Visitor class which detects whether a given interface block has been used.
6581 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6584 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6585 : mode(mode
), block(block
), found(false)
6589 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6591 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6595 return visit_continue
;
6598 bool usage_found() const
6604 ir_variable_mode mode
;
6605 const glsl_type
*block
;
6610 is_unsized_array_last_element(ir_variable
*v
)
6612 const glsl_type
*interface_type
= v
->get_interface_type();
6613 int length
= interface_type
->length
;
6615 assert(v
->type
->is_unsized_array());
6617 /* Check if it is the last element of the interface */
6618 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6624 ast_interface_block::hir(exec_list
*instructions
,
6625 struct _mesa_glsl_parse_state
*state
)
6627 YYLTYPE loc
= this->get_location();
6629 /* Interface blocks must be declared at global scope */
6630 if (state
->current_function
!= NULL
) {
6631 _mesa_glsl_error(&loc
, state
,
6632 "Interface block `%s' must be declared "
6637 if (!this->layout
.flags
.q
.buffer
&&
6638 this->layout
.flags
.q
.std430
) {
6639 _mesa_glsl_error(&loc
, state
,
6640 "std430 storage block layout qualifier is supported "
6641 "only for shader storage blocks");
6644 /* The ast_interface_block has a list of ast_declarator_lists. We
6645 * need to turn those into ir_variables with an association
6646 * with this uniform block.
6648 enum glsl_interface_packing packing
;
6649 if (this->layout
.flags
.q
.shared
) {
6650 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6651 } else if (this->layout
.flags
.q
.packed
) {
6652 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6653 } else if (this->layout
.flags
.q
.std430
) {
6654 packing
= GLSL_INTERFACE_PACKING_STD430
;
6656 /* The default layout is std140.
6658 packing
= GLSL_INTERFACE_PACKING_STD140
;
6661 ir_variable_mode var_mode
;
6662 const char *iface_type_name
;
6663 if (this->layout
.flags
.q
.in
) {
6664 var_mode
= ir_var_shader_in
;
6665 iface_type_name
= "in";
6666 } else if (this->layout
.flags
.q
.out
) {
6667 var_mode
= ir_var_shader_out
;
6668 iface_type_name
= "out";
6669 } else if (this->layout
.flags
.q
.uniform
) {
6670 var_mode
= ir_var_uniform
;
6671 iface_type_name
= "uniform";
6672 } else if (this->layout
.flags
.q
.buffer
) {
6673 var_mode
= ir_var_shader_storage
;
6674 iface_type_name
= "buffer";
6676 var_mode
= ir_var_auto
;
6677 iface_type_name
= "UNKNOWN";
6678 assert(!"interface block layout qualifier not found!");
6681 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6682 if (this->layout
.flags
.q
.row_major
)
6683 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6684 else if (this->layout
.flags
.q
.column_major
)
6685 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6687 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6688 exec_list declared_variables
;
6689 glsl_struct_field
*fields
;
6691 /* Treat an interface block as one level of nesting, so that embedded struct
6692 * specifiers will be disallowed.
6694 state
->struct_specifier_depth
++;
6696 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
6697 * that we don't have incompatible qualifiers
6699 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
6700 _mesa_glsl_error(&loc
, state
,
6701 "Interface block sets both readonly and writeonly");
6704 unsigned qual_stream
;
6705 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
6707 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
6708 /* If the stream qualifier is invalid it doesn't make sense to continue
6709 * on and try to compare stream layouts on member variables against it
6710 * so just return early.
6715 unsigned expl_location
= 0;
6716 if (layout
.flags
.q
.explicit_location
) {
6717 if (!process_qualifier_constant(state
, &loc
, "location",
6718 layout
.location
, &expl_location
)) {
6721 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6725 unsigned int num_variables
=
6726 ast_process_struct_or_iface_block_members(&declared_variables
,
6728 &this->declarations
,
6732 redeclaring_per_vertex
,
6738 state
->struct_specifier_depth
--;
6740 if (!redeclaring_per_vertex
) {
6741 validate_identifier(this->block_name
, loc
, state
);
6743 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6745 * "Block names have no other use within a shader beyond interface
6746 * matching; it is a compile-time error to use a block name at global
6747 * scope for anything other than as a block name."
6749 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6750 if (var
&& !var
->type
->is_interface()) {
6751 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6752 "already used in the scope.",
6757 const glsl_type
*earlier_per_vertex
= NULL
;
6758 if (redeclaring_per_vertex
) {
6759 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6760 * the named interface block gl_in, we can find it by looking at the
6761 * previous declaration of gl_in. Otherwise we can find it by looking
6762 * at the previous decalartion of any of the built-in outputs,
6765 * Also check that the instance name and array-ness of the redeclaration
6769 case ir_var_shader_in
:
6770 if (ir_variable
*earlier_gl_in
=
6771 state
->symbols
->get_variable("gl_in")) {
6772 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6774 _mesa_glsl_error(&loc
, state
,
6775 "redeclaration of gl_PerVertex input not allowed "
6777 _mesa_shader_stage_to_string(state
->stage
));
6779 if (this->instance_name
== NULL
||
6780 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
6781 !this->array_specifier
->is_single_dimension()) {
6782 _mesa_glsl_error(&loc
, state
,
6783 "gl_PerVertex input must be redeclared as "
6787 case ir_var_shader_out
:
6788 if (ir_variable
*earlier_gl_Position
=
6789 state
->symbols
->get_variable("gl_Position")) {
6790 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6791 } else if (ir_variable
*earlier_gl_out
=
6792 state
->symbols
->get_variable("gl_out")) {
6793 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6795 _mesa_glsl_error(&loc
, state
,
6796 "redeclaration of gl_PerVertex output not "
6797 "allowed in the %s shader",
6798 _mesa_shader_stage_to_string(state
->stage
));
6800 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6801 if (this->instance_name
== NULL
||
6802 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6803 _mesa_glsl_error(&loc
, state
,
6804 "gl_PerVertex output must be redeclared as "
6808 if (this->instance_name
!= NULL
) {
6809 _mesa_glsl_error(&loc
, state
,
6810 "gl_PerVertex output may not be redeclared with "
6811 "an instance name");
6816 _mesa_glsl_error(&loc
, state
,
6817 "gl_PerVertex must be declared as an input or an "
6822 if (earlier_per_vertex
== NULL
) {
6823 /* An error has already been reported. Bail out to avoid null
6824 * dereferences later in this function.
6829 /* Copy locations from the old gl_PerVertex interface block. */
6830 for (unsigned i
= 0; i
< num_variables
; i
++) {
6831 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6833 _mesa_glsl_error(&loc
, state
,
6834 "redeclaration of gl_PerVertex must be a subset "
6835 "of the built-in members of gl_PerVertex");
6837 fields
[i
].location
=
6838 earlier_per_vertex
->fields
.structure
[j
].location
;
6839 fields
[i
].interpolation
=
6840 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6841 fields
[i
].centroid
=
6842 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6844 earlier_per_vertex
->fields
.structure
[j
].sample
;
6846 earlier_per_vertex
->fields
.structure
[j
].patch
;
6847 fields
[i
].precision
=
6848 earlier_per_vertex
->fields
.structure
[j
].precision
;
6852 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6855 * If a built-in interface block is redeclared, it must appear in
6856 * the shader before any use of any member included in the built-in
6857 * declaration, or a compilation error will result.
6859 * This appears to be a clarification to the behaviour established for
6860 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6861 * regardless of GLSL version.
6863 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6864 v
.run(instructions
);
6865 if (v
.usage_found()) {
6866 _mesa_glsl_error(&loc
, state
,
6867 "redeclaration of a built-in interface block must "
6868 "appear before any use of any member of the "
6873 const glsl_type
*block_type
=
6874 glsl_type::get_interface_instance(fields
,
6879 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6880 YYLTYPE loc
= this->get_location();
6881 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6882 "already taken in the current scope",
6883 this->block_name
, iface_type_name
);
6886 /* Since interface blocks cannot contain statements, it should be
6887 * impossible for the block to generate any instructions.
6889 assert(declared_variables
.is_empty());
6891 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
6893 * Geometry shader input variables get the per-vertex values written
6894 * out by vertex shader output variables of the same names. Since a
6895 * geometry shader operates on a set of vertices, each input varying
6896 * variable (or input block, see interface blocks below) needs to be
6897 * declared as an array.
6899 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
6900 var_mode
== ir_var_shader_in
) {
6901 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
6902 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6903 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
6904 this->array_specifier
== NULL
&&
6905 var_mode
== ir_var_shader_in
) {
6906 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
6907 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
6908 this->array_specifier
== NULL
&&
6909 var_mode
== ir_var_shader_out
) {
6910 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
6914 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
6917 * "If an instance name (instance-name) is used, then it puts all the
6918 * members inside a scope within its own name space, accessed with the
6919 * field selector ( . ) operator (analogously to structures)."
6921 if (this->instance_name
) {
6922 if (redeclaring_per_vertex
) {
6923 /* When a built-in in an unnamed interface block is redeclared,
6924 * get_variable_being_redeclared() calls
6925 * check_builtin_array_max_size() to make sure that built-in array
6926 * variables aren't redeclared to illegal sizes. But we're looking
6927 * at a redeclaration of a named built-in interface block. So we
6928 * have to manually call check_builtin_array_max_size() for all parts
6929 * of the interface that are arrays.
6931 for (unsigned i
= 0; i
< num_variables
; i
++) {
6932 if (fields
[i
].type
->is_array()) {
6933 const unsigned size
= fields
[i
].type
->array_size();
6934 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
6938 validate_identifier(this->instance_name
, loc
, state
);
6943 if (this->array_specifier
!= NULL
) {
6944 const glsl_type
*block_array_type
=
6945 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
6947 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
6949 * For uniform blocks declared an array, each individual array
6950 * element corresponds to a separate buffer object backing one
6951 * instance of the block. As the array size indicates the number
6952 * of buffer objects needed, uniform block array declarations
6953 * must specify an array size.
6955 * And a few paragraphs later:
6957 * Geometry shader input blocks must be declared as arrays and
6958 * follow the array declaration and linking rules for all
6959 * geometry shader inputs. All other input and output block
6960 * arrays must specify an array size.
6962 * The same applies to tessellation shaders.
6964 * The upshot of this is that the only circumstance where an
6965 * interface array size *doesn't* need to be specified is on a
6966 * geometry shader input, tessellation control shader input,
6967 * tessellation control shader output, and tessellation evaluation
6970 if (block_array_type
->is_unsized_array()) {
6971 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
6972 state
->stage
== MESA_SHADER_TESS_CTRL
||
6973 state
->stage
== MESA_SHADER_TESS_EVAL
;
6974 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
6976 if (this->layout
.flags
.q
.in
) {
6978 _mesa_glsl_error(&loc
, state
,
6979 "unsized input block arrays not allowed in "
6981 _mesa_shader_stage_to_string(state
->stage
));
6982 } else if (this->layout
.flags
.q
.out
) {
6984 _mesa_glsl_error(&loc
, state
,
6985 "unsized output block arrays not allowed in "
6987 _mesa_shader_stage_to_string(state
->stage
));
6989 /* by elimination, this is a uniform block array */
6990 _mesa_glsl_error(&loc
, state
,
6991 "unsized uniform block arrays not allowed in "
6993 _mesa_shader_stage_to_string(state
->stage
));
6997 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
6999 * * Arrays of arrays of blocks are not allowed
7001 if (state
->es_shader
&& block_array_type
->is_array() &&
7002 block_array_type
->fields
.array
->is_array()) {
7003 _mesa_glsl_error(&loc
, state
,
7004 "arrays of arrays interface blocks are "
7008 var
= new(state
) ir_variable(block_array_type
,
7009 this->instance_name
,
7012 var
= new(state
) ir_variable(block_type
,
7013 this->instance_name
,
7017 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7018 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7020 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7021 var
->data
.read_only
= true;
7023 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7024 handle_geometry_shader_input_decl(state
, loc
, var
);
7025 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7026 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7027 handle_tess_shader_input_decl(state
, loc
, var
);
7028 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7029 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7031 for (unsigned i
= 0; i
< num_variables
; i
++) {
7032 if (fields
[i
].type
->is_unsized_array()) {
7033 if (var_mode
== ir_var_shader_storage
) {
7034 if (i
!= (num_variables
- 1)) {
7035 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7036 "only last member of a shader storage block "
7037 "can be defined as unsized array",
7041 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7043 * "If an array is declared as the last member of a shader storage
7044 * block and the size is not specified at compile-time, it is
7045 * sized at run-time. In all other cases, arrays are sized only
7048 if (state
->es_shader
) {
7049 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7050 "only last member of a shader storage block "
7051 "can be defined as unsized array",
7058 if (ir_variable
*earlier
=
7059 state
->symbols
->get_variable(this->instance_name
)) {
7060 if (!redeclaring_per_vertex
) {
7061 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7062 this->instance_name
);
7064 earlier
->data
.how_declared
= ir_var_declared_normally
;
7065 earlier
->type
= var
->type
;
7066 earlier
->reinit_interface_type(block_type
);
7069 if (this->layout
.flags
.q
.explicit_binding
) {
7070 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7074 var
->data
.stream
= qual_stream
;
7075 if (layout
.flags
.q
.explicit_location
) {
7076 var
->data
.location
= expl_location
;
7077 var
->data
.explicit_location
= true;
7080 state
->symbols
->add_variable(var
);
7081 instructions
->push_tail(var
);
7084 /* In order to have an array size, the block must also be declared with
7087 assert(this->array_specifier
== NULL
);
7089 for (unsigned i
= 0; i
< num_variables
; i
++) {
7091 new(state
) ir_variable(fields
[i
].type
,
7092 ralloc_strdup(state
, fields
[i
].name
),
7094 var
->data
.interpolation
= fields
[i
].interpolation
;
7095 var
->data
.centroid
= fields
[i
].centroid
;
7096 var
->data
.sample
= fields
[i
].sample
;
7097 var
->data
.patch
= fields
[i
].patch
;
7098 var
->data
.stream
= qual_stream
;
7099 var
->data
.location
= fields
[i
].location
;
7100 if (fields
[i
].location
!= -1)
7101 var
->data
.explicit_location
= true;
7102 var
->init_interface_type(block_type
);
7104 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7105 var
->data
.read_only
= true;
7107 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7108 if (state
->es_shader
) {
7109 var
->data
.precision
=
7110 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7114 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7115 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7116 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7118 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7121 if (var
->data
.mode
== ir_var_shader_storage
) {
7122 var
->data
.image_read_only
= fields
[i
].image_read_only
;
7123 var
->data
.image_write_only
= fields
[i
].image_write_only
;
7124 var
->data
.image_coherent
= fields
[i
].image_coherent
;
7125 var
->data
.image_volatile
= fields
[i
].image_volatile
;
7126 var
->data
.image_restrict
= fields
[i
].image_restrict
;
7129 /* Examine var name here since var may get deleted in the next call */
7130 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7132 if (redeclaring_per_vertex
) {
7133 ir_variable
*earlier
=
7134 get_variable_being_redeclared(var
, loc
, state
,
7135 true /* allow_all_redeclarations */);
7136 if (!var_is_gl_id
|| earlier
== NULL
) {
7137 _mesa_glsl_error(&loc
, state
,
7138 "redeclaration of gl_PerVertex can only "
7139 "include built-in variables");
7140 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7141 _mesa_glsl_error(&loc
, state
,
7142 "`%s' has already been redeclared",
7145 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7146 earlier
->reinit_interface_type(block_type
);
7151 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7152 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7154 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7155 * The UBO declaration itself doesn't get an ir_variable unless it
7156 * has an instance name. This is ugly.
7158 if (this->layout
.flags
.q
.explicit_binding
) {
7159 apply_explicit_binding(state
, &loc
, var
,
7160 var
->get_interface_type(), &this->layout
);
7163 if (var
->type
->is_unsized_array()) {
7164 if (var
->is_in_shader_storage_block()) {
7165 if (!is_unsized_array_last_element(var
)) {
7166 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7167 "only last member of a shader storage block "
7168 "can be defined as unsized array",
7171 var
->data
.from_ssbo_unsized_array
= true;
7173 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7175 * "If an array is declared as the last member of a shader storage
7176 * block and the size is not specified at compile-time, it is
7177 * sized at run-time. In all other cases, arrays are sized only
7180 if (state
->es_shader
) {
7181 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7182 "only last member of a shader storage block "
7183 "can be defined as unsized array",
7189 state
->symbols
->add_variable(var
);
7190 instructions
->push_tail(var
);
7193 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7194 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7196 * It is also a compilation error ... to redeclare a built-in
7197 * block and then use a member from that built-in block that was
7198 * not included in the redeclaration.
7200 * This appears to be a clarification to the behaviour established
7201 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7202 * behaviour regardless of GLSL version.
7204 * To prevent the shader from using a member that was not included in
7205 * the redeclaration, we disable any ir_variables that are still
7206 * associated with the old declaration of gl_PerVertex (since we've
7207 * already updated all of the variables contained in the new
7208 * gl_PerVertex to point to it).
7210 * As a side effect this will prevent
7211 * validate_intrastage_interface_blocks() from getting confused and
7212 * thinking there are conflicting definitions of gl_PerVertex in the
7215 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7216 ir_variable
*const var
= node
->as_variable();
7218 var
->get_interface_type() == earlier_per_vertex
&&
7219 var
->data
.mode
== var_mode
) {
7220 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7221 _mesa_glsl_error(&loc
, state
,
7222 "redeclaration of gl_PerVertex cannot "
7223 "follow a redeclaration of `%s'",
7226 state
->symbols
->disable_variable(var
->name
);
7238 ast_tcs_output_layout::hir(exec_list
*instructions
,
7239 struct _mesa_glsl_parse_state
*state
)
7241 YYLTYPE loc
= this->get_location();
7243 unsigned num_vertices
;
7244 if (!state
->out_qualifier
->vertices
->
7245 process_qualifier_constant(state
, "vertices", &num_vertices
,
7247 /* return here to stop cascading incorrect error messages */
7251 /* If any shader outputs occurred before this declaration and specified an
7252 * array size, make sure the size they specified is consistent with the
7255 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7256 _mesa_glsl_error(&loc
, state
,
7257 "this tessellation control shader output layout "
7258 "specifies %u vertices, but a previous output "
7259 "is declared with size %u",
7260 num_vertices
, state
->tcs_output_size
);
7264 state
->tcs_output_vertices_specified
= true;
7266 /* If any shader outputs occurred before this declaration and did not
7267 * specify an array size, their size is determined now.
7269 foreach_in_list (ir_instruction
, node
, instructions
) {
7270 ir_variable
*var
= node
->as_variable();
7271 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7274 /* Note: Not all tessellation control shader output are arrays. */
7275 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7278 if (var
->data
.max_array_access
>= num_vertices
) {
7279 _mesa_glsl_error(&loc
, state
,
7280 "this tessellation control shader output layout "
7281 "specifies %u vertices, but an access to element "
7282 "%u of output `%s' already exists", num_vertices
,
7283 var
->data
.max_array_access
, var
->name
);
7285 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7295 ast_gs_input_layout::hir(exec_list
*instructions
,
7296 struct _mesa_glsl_parse_state
*state
)
7298 YYLTYPE loc
= this->get_location();
7300 /* If any geometry input layout declaration preceded this one, make sure it
7301 * was consistent with this one.
7303 if (state
->gs_input_prim_type_specified
&&
7304 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7305 _mesa_glsl_error(&loc
, state
,
7306 "geometry shader input layout does not match"
7307 " previous declaration");
7311 /* If any shader inputs occurred before this declaration and specified an
7312 * array size, make sure the size they specified is consistent with the
7315 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7316 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7317 _mesa_glsl_error(&loc
, state
,
7318 "this geometry shader input layout implies %u vertices"
7319 " per primitive, but a previous input is declared"
7320 " with size %u", num_vertices
, state
->gs_input_size
);
7324 state
->gs_input_prim_type_specified
= true;
7326 /* If any shader inputs occurred before this declaration and did not
7327 * specify an array size, their size is determined now.
7329 foreach_in_list(ir_instruction
, node
, instructions
) {
7330 ir_variable
*var
= node
->as_variable();
7331 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7334 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7338 if (var
->type
->is_unsized_array()) {
7339 if (var
->data
.max_array_access
>= num_vertices
) {
7340 _mesa_glsl_error(&loc
, state
,
7341 "this geometry shader input layout implies %u"
7342 " vertices, but an access to element %u of input"
7343 " `%s' already exists", num_vertices
,
7344 var
->data
.max_array_access
, var
->name
);
7346 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7357 ast_cs_input_layout::hir(exec_list
*instructions
,
7358 struct _mesa_glsl_parse_state
*state
)
7360 YYLTYPE loc
= this->get_location();
7362 /* From the ARB_compute_shader specification:
7364 * If the local size of the shader in any dimension is greater
7365 * than the maximum size supported by the implementation for that
7366 * dimension, a compile-time error results.
7368 * It is not clear from the spec how the error should be reported if
7369 * the total size of the work group exceeds
7370 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7371 * report it at compile time as well.
7373 GLuint64 total_invocations
= 1;
7374 unsigned qual_local_size
[3];
7375 for (int i
= 0; i
< 3; i
++) {
7377 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7379 /* Infer a local_size of 1 for unspecified dimensions */
7380 if (this->local_size
[i
] == NULL
) {
7381 qual_local_size
[i
] = 1;
7382 } else if (!this->local_size
[i
]->
7383 process_qualifier_constant(state
, local_size_str
,
7384 &qual_local_size
[i
], false)) {
7385 ralloc_free(local_size_str
);
7388 ralloc_free(local_size_str
);
7390 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7391 _mesa_glsl_error(&loc
, state
,
7392 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7394 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7397 total_invocations
*= qual_local_size
[i
];
7398 if (total_invocations
>
7399 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7400 _mesa_glsl_error(&loc
, state
,
7401 "product of local_sizes exceeds "
7402 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7403 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7408 /* If any compute input layout declaration preceded this one, make sure it
7409 * was consistent with this one.
7411 if (state
->cs_input_local_size_specified
) {
7412 for (int i
= 0; i
< 3; i
++) {
7413 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7414 _mesa_glsl_error(&loc
, state
,
7415 "compute shader input layout does not match"
7416 " previous declaration");
7422 state
->cs_input_local_size_specified
= true;
7423 for (int i
= 0; i
< 3; i
++)
7424 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7426 /* We may now declare the built-in constant gl_WorkGroupSize (see
7427 * builtin_variable_generator::generate_constants() for why we didn't
7428 * declare it earlier).
7430 ir_variable
*var
= new(state
->symbols
)
7431 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7432 var
->data
.how_declared
= ir_var_declared_implicitly
;
7433 var
->data
.read_only
= true;
7434 instructions
->push_tail(var
);
7435 state
->symbols
->add_variable(var
);
7436 ir_constant_data data
;
7437 memset(&data
, 0, sizeof(data
));
7438 for (int i
= 0; i
< 3; i
++)
7439 data
.u
[i
] = qual_local_size
[i
];
7440 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7441 var
->constant_initializer
=
7442 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7443 var
->data
.has_initializer
= true;
7450 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7451 exec_list
*instructions
)
7453 bool gl_FragColor_assigned
= false;
7454 bool gl_FragData_assigned
= false;
7455 bool gl_FragSecondaryColor_assigned
= false;
7456 bool gl_FragSecondaryData_assigned
= false;
7457 bool user_defined_fs_output_assigned
= false;
7458 ir_variable
*user_defined_fs_output
= NULL
;
7460 /* It would be nice to have proper location information. */
7462 memset(&loc
, 0, sizeof(loc
));
7464 foreach_in_list(ir_instruction
, node
, instructions
) {
7465 ir_variable
*var
= node
->as_variable();
7467 if (!var
|| !var
->data
.assigned
)
7470 if (strcmp(var
->name
, "gl_FragColor") == 0)
7471 gl_FragColor_assigned
= true;
7472 else if (strcmp(var
->name
, "gl_FragData") == 0)
7473 gl_FragData_assigned
= true;
7474 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7475 gl_FragSecondaryColor_assigned
= true;
7476 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7477 gl_FragSecondaryData_assigned
= true;
7478 else if (!is_gl_identifier(var
->name
)) {
7479 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7480 var
->data
.mode
== ir_var_shader_out
) {
7481 user_defined_fs_output_assigned
= true;
7482 user_defined_fs_output
= var
;
7487 /* From the GLSL 1.30 spec:
7489 * "If a shader statically assigns a value to gl_FragColor, it
7490 * may not assign a value to any element of gl_FragData. If a
7491 * shader statically writes a value to any element of
7492 * gl_FragData, it may not assign a value to
7493 * gl_FragColor. That is, a shader may assign values to either
7494 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7495 * linked together must also consistently write just one of
7496 * these variables. Similarly, if user declared output
7497 * variables are in use (statically assigned to), then the
7498 * built-in variables gl_FragColor and gl_FragData may not be
7499 * assigned to. These incorrect usages all generate compile
7502 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7503 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7504 "`gl_FragColor' and `gl_FragData'");
7505 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7506 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7507 "`gl_FragColor' and `%s'",
7508 user_defined_fs_output
->name
);
7509 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7510 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7511 "`gl_FragSecondaryColorEXT' and"
7512 " `gl_FragSecondaryDataEXT'");
7513 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7514 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7515 "`gl_FragColor' and"
7516 " `gl_FragSecondaryDataEXT'");
7517 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7518 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7520 " `gl_FragSecondaryColorEXT'");
7521 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7522 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7523 "`gl_FragData' and `%s'",
7524 user_defined_fs_output
->name
);
7527 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7528 !state
->EXT_blend_func_extended_enable
) {
7529 _mesa_glsl_error(&loc
, state
,
7530 "Dual source blending requires EXT_blend_func_extended");
7536 remove_per_vertex_blocks(exec_list
*instructions
,
7537 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7539 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7540 * if it exists in this shader type.
7542 const glsl_type
*per_vertex
= NULL
;
7544 case ir_var_shader_in
:
7545 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7546 per_vertex
= gl_in
->get_interface_type();
7548 case ir_var_shader_out
:
7549 if (ir_variable
*gl_Position
=
7550 state
->symbols
->get_variable("gl_Position")) {
7551 per_vertex
= gl_Position
->get_interface_type();
7555 assert(!"Unexpected mode");
7559 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7560 * need to do anything.
7562 if (per_vertex
== NULL
)
7565 /* If the interface block is used by the shader, then we don't need to do
7568 interface_block_usage_visitor
v(mode
, per_vertex
);
7569 v
.run(instructions
);
7570 if (v
.usage_found())
7573 /* Remove any ir_variable declarations that refer to the interface block
7576 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7577 ir_variable
*const var
= node
->as_variable();
7578 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
7579 var
->data
.mode
== mode
) {
7580 state
->symbols
->disable_variable(var
->name
);