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_ATOMIC_UINT
:
1133 case GLSL_TYPE_SUBROUTINE
:
1134 /* I assume a comparison of a struct containing a sampler just
1135 * ignores the sampler present in the type.
1141 cmp
= new(mem_ctx
) ir_constant(true);
1146 /* For logical operations, we want to ensure that the operands are
1147 * scalar booleans. If it isn't, emit an error and return a constant
1148 * boolean to avoid triggering cascading error messages.
1151 get_scalar_boolean_operand(exec_list
*instructions
,
1152 struct _mesa_glsl_parse_state
*state
,
1153 ast_expression
*parent_expr
,
1155 const char *operand_name
,
1156 bool *error_emitted
)
1158 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1160 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1162 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1165 if (!*error_emitted
) {
1166 YYLTYPE loc
= expr
->get_location();
1167 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1169 parent_expr
->operator_string(parent_expr
->oper
));
1170 *error_emitted
= true;
1173 return new(ctx
) ir_constant(true);
1177 * If name refers to a builtin array whose maximum allowed size is less than
1178 * size, report an error and return true. Otherwise return false.
1181 check_builtin_array_max_size(const char *name
, unsigned size
,
1182 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1184 if ((strcmp("gl_TexCoord", name
) == 0)
1185 && (size
> state
->Const
.MaxTextureCoords
)) {
1186 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1188 * "The size [of gl_TexCoord] can be at most
1189 * gl_MaxTextureCoords."
1191 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1192 "be larger than gl_MaxTextureCoords (%u)",
1193 state
->Const
.MaxTextureCoords
);
1194 } else if (strcmp("gl_ClipDistance", name
) == 0
1195 && size
> state
->Const
.MaxClipPlanes
) {
1196 /* From section 7.1 (Vertex Shader Special Variables) of the
1199 * "The gl_ClipDistance array is predeclared as unsized and
1200 * must be sized by the shader either redeclaring it with a
1201 * size or indexing it only with integral constant
1202 * expressions. ... The size can be at most
1203 * gl_MaxClipDistances."
1205 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1206 "be larger than gl_MaxClipDistances (%u)",
1207 state
->Const
.MaxClipPlanes
);
1212 * Create the constant 1, of a which is appropriate for incrementing and
1213 * decrementing values of the given GLSL type. For example, if type is vec4,
1214 * this creates a constant value of 1.0 having type float.
1216 * If the given type is invalid for increment and decrement operators, return
1217 * a floating point 1--the error will be detected later.
1220 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1222 switch (type
->base_type
) {
1223 case GLSL_TYPE_UINT
:
1224 return new(ctx
) ir_constant((unsigned) 1);
1226 return new(ctx
) ir_constant(1);
1228 case GLSL_TYPE_FLOAT
:
1229 return new(ctx
) ir_constant(1.0f
);
1234 ast_expression::hir(exec_list
*instructions
,
1235 struct _mesa_glsl_parse_state
*state
)
1237 return do_hir(instructions
, state
, true);
1241 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1242 struct _mesa_glsl_parse_state
*state
)
1244 do_hir(instructions
, state
, false);
1248 ast_expression::do_hir(exec_list
*instructions
,
1249 struct _mesa_glsl_parse_state
*state
,
1253 static const int operations
[AST_NUM_OPERATORS
] = {
1254 -1, /* ast_assign doesn't convert to ir_expression. */
1255 -1, /* ast_plus doesn't convert to ir_expression. */
1269 ir_binop_any_nequal
,
1279 /* Note: The following block of expression types actually convert
1280 * to multiple IR instructions.
1282 ir_binop_mul
, /* ast_mul_assign */
1283 ir_binop_div
, /* ast_div_assign */
1284 ir_binop_mod
, /* ast_mod_assign */
1285 ir_binop_add
, /* ast_add_assign */
1286 ir_binop_sub
, /* ast_sub_assign */
1287 ir_binop_lshift
, /* ast_ls_assign */
1288 ir_binop_rshift
, /* ast_rs_assign */
1289 ir_binop_bit_and
, /* ast_and_assign */
1290 ir_binop_bit_xor
, /* ast_xor_assign */
1291 ir_binop_bit_or
, /* ast_or_assign */
1293 -1, /* ast_conditional doesn't convert to ir_expression. */
1294 ir_binop_add
, /* ast_pre_inc. */
1295 ir_binop_sub
, /* ast_pre_dec. */
1296 ir_binop_add
, /* ast_post_inc. */
1297 ir_binop_sub
, /* ast_post_dec. */
1298 -1, /* ast_field_selection doesn't conv to ir_expression. */
1299 -1, /* ast_array_index doesn't convert to ir_expression. */
1300 -1, /* ast_function_call doesn't conv to ir_expression. */
1301 -1, /* ast_identifier doesn't convert to ir_expression. */
1302 -1, /* ast_int_constant doesn't convert to ir_expression. */
1303 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1304 -1, /* ast_float_constant doesn't conv to ir_expression. */
1305 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1306 -1, /* ast_sequence doesn't convert to ir_expression. */
1308 ir_rvalue
*result
= NULL
;
1310 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1311 bool error_emitted
= false;
1314 loc
= this->get_location();
1316 switch (this->oper
) {
1318 assert(!"ast_aggregate: Should never get here.");
1322 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1323 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1326 do_assignment(instructions
, state
,
1327 this->subexpressions
[0]->non_lvalue_description
,
1328 op
[0], op
[1], &result
, needs_rvalue
, false,
1329 this->subexpressions
[0]->get_location());
1334 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1336 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1338 error_emitted
= type
->is_error();
1344 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1346 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1348 error_emitted
= type
->is_error();
1350 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1358 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1359 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1361 type
= arithmetic_result_type(op
[0], op
[1],
1362 (this->oper
== ast_mul
),
1364 error_emitted
= type
->is_error();
1366 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1371 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1372 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1374 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1376 assert(operations
[this->oper
] == ir_binop_mod
);
1378 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1380 error_emitted
= type
->is_error();
1385 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1386 error_emitted
= true;
1389 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1390 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1391 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1393 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1395 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1402 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1403 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1405 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1407 /* The relational operators must either generate an error or result
1408 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1410 assert(type
->is_error()
1411 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1412 && type
->is_scalar()));
1414 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1416 error_emitted
= type
->is_error();
1421 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1422 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1424 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1426 * "The equality operators equal (==), and not equal (!=)
1427 * operate on all types. They result in a scalar Boolean. If
1428 * the operand types do not match, then there must be a
1429 * conversion from Section 4.1.10 "Implicit Conversions"
1430 * applied to one operand that can make them match, in which
1431 * case this conversion is done."
1434 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1435 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1436 "no operation `%1$s' exists that takes a left-hand "
1437 "operand of type 'void' or a right operand of type "
1438 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1439 error_emitted
= true;
1440 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1441 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1442 || (op
[0]->type
!= op
[1]->type
)) {
1443 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1444 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1445 error_emitted
= true;
1446 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1447 !state
->check_version(120, 300, &loc
,
1448 "array comparisons forbidden")) {
1449 error_emitted
= true;
1450 } else if ((op
[0]->type
->contains_opaque() ||
1451 op
[1]->type
->contains_opaque())) {
1452 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1453 error_emitted
= true;
1456 if (error_emitted
) {
1457 result
= new(ctx
) ir_constant(false);
1459 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1460 assert(result
->type
== glsl_type::bool_type
);
1467 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1468 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1469 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1470 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1472 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1476 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1478 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1479 error_emitted
= true;
1482 if (!op
[0]->type
->is_integer()) {
1483 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1484 error_emitted
= true;
1487 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1488 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1491 case ast_logic_and
: {
1492 exec_list rhs_instructions
;
1493 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1494 "LHS", &error_emitted
);
1495 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1496 "RHS", &error_emitted
);
1498 if (rhs_instructions
.is_empty()) {
1499 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1500 type
= result
->type
;
1502 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1505 instructions
->push_tail(tmp
);
1507 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1508 instructions
->push_tail(stmt
);
1510 stmt
->then_instructions
.append_list(&rhs_instructions
);
1511 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1512 ir_assignment
*const then_assign
=
1513 new(ctx
) ir_assignment(then_deref
, op
[1]);
1514 stmt
->then_instructions
.push_tail(then_assign
);
1516 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1517 ir_assignment
*const else_assign
=
1518 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1519 stmt
->else_instructions
.push_tail(else_assign
);
1521 result
= new(ctx
) ir_dereference_variable(tmp
);
1527 case ast_logic_or
: {
1528 exec_list rhs_instructions
;
1529 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1530 "LHS", &error_emitted
);
1531 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1532 "RHS", &error_emitted
);
1534 if (rhs_instructions
.is_empty()) {
1535 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1536 type
= result
->type
;
1538 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1541 instructions
->push_tail(tmp
);
1543 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1544 instructions
->push_tail(stmt
);
1546 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1547 ir_assignment
*const then_assign
=
1548 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1549 stmt
->then_instructions
.push_tail(then_assign
);
1551 stmt
->else_instructions
.append_list(&rhs_instructions
);
1552 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1553 ir_assignment
*const else_assign
=
1554 new(ctx
) ir_assignment(else_deref
, op
[1]);
1555 stmt
->else_instructions
.push_tail(else_assign
);
1557 result
= new(ctx
) ir_dereference_variable(tmp
);
1564 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1566 * "The logical binary operators and (&&), or ( | | ), and
1567 * exclusive or (^^). They operate only on two Boolean
1568 * expressions and result in a Boolean expression."
1570 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1572 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1575 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1580 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1581 "operand", &error_emitted
);
1583 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1587 case ast_mul_assign
:
1588 case ast_div_assign
:
1589 case ast_add_assign
:
1590 case ast_sub_assign
: {
1591 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1592 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1594 type
= arithmetic_result_type(op
[0], op
[1],
1595 (this->oper
== ast_mul_assign
),
1598 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1602 do_assignment(instructions
, state
,
1603 this->subexpressions
[0]->non_lvalue_description
,
1604 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1605 &result
, needs_rvalue
, false,
1606 this->subexpressions
[0]->get_location());
1608 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1609 * explicitly test for this because none of the binary expression
1610 * operators allow array operands either.
1616 case ast_mod_assign
: {
1617 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1618 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1620 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1622 assert(operations
[this->oper
] == ir_binop_mod
);
1624 ir_rvalue
*temp_rhs
;
1625 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1629 do_assignment(instructions
, state
,
1630 this->subexpressions
[0]->non_lvalue_description
,
1631 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1632 &result
, needs_rvalue
, false,
1633 this->subexpressions
[0]->get_location());
1638 case ast_rs_assign
: {
1639 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1640 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1641 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1643 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1644 type
, op
[0], op
[1]);
1646 do_assignment(instructions
, state
,
1647 this->subexpressions
[0]->non_lvalue_description
,
1648 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1649 &result
, needs_rvalue
, false,
1650 this->subexpressions
[0]->get_location());
1654 case ast_and_assign
:
1655 case ast_xor_assign
:
1656 case ast_or_assign
: {
1657 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1658 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1659 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1660 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1661 type
, op
[0], op
[1]);
1663 do_assignment(instructions
, state
,
1664 this->subexpressions
[0]->non_lvalue_description
,
1665 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1666 &result
, needs_rvalue
, false,
1667 this->subexpressions
[0]->get_location());
1671 case ast_conditional
: {
1672 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1674 * "The ternary selection operator (?:). It operates on three
1675 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1676 * first expression, which must result in a scalar Boolean."
1678 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1679 "condition", &error_emitted
);
1681 /* The :? operator is implemented by generating an anonymous temporary
1682 * followed by an if-statement. The last instruction in each branch of
1683 * the if-statement assigns a value to the anonymous temporary. This
1684 * temporary is the r-value of the expression.
1686 exec_list then_instructions
;
1687 exec_list else_instructions
;
1689 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1690 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1692 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1694 * "The second and third expressions can be any type, as
1695 * long their types match, or there is a conversion in
1696 * Section 4.1.10 "Implicit Conversions" that can be applied
1697 * to one of the expressions to make their types match. This
1698 * resulting matching type is the type of the entire
1701 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1702 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1703 || (op
[1]->type
!= op
[2]->type
)) {
1704 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1706 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1707 "operator must have matching types");
1708 error_emitted
= true;
1709 type
= glsl_type::error_type
;
1714 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1716 * "The second and third expressions must be the same type, but can
1717 * be of any type other than an array."
1719 if (type
->is_array() &&
1720 !state
->check_version(120, 300, &loc
,
1721 "second and third operands of ?: operator "
1722 "cannot be arrays")) {
1723 error_emitted
= true;
1726 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1728 * "Except for array indexing, structure member selection, and
1729 * parentheses, opaque variables are not allowed to be operands in
1730 * expressions; such use results in a compile-time error."
1732 if (type
->contains_opaque()) {
1733 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1734 "of the ?: operator");
1735 error_emitted
= true;
1738 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1740 if (then_instructions
.is_empty()
1741 && else_instructions
.is_empty()
1742 && cond_val
!= NULL
) {
1743 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1745 /* The copy to conditional_tmp reads the whole array. */
1746 if (type
->is_array()) {
1747 mark_whole_array_access(op
[1]);
1748 mark_whole_array_access(op
[2]);
1751 ir_variable
*const tmp
=
1752 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1753 instructions
->push_tail(tmp
);
1755 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1756 instructions
->push_tail(stmt
);
1758 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1759 ir_dereference
*const then_deref
=
1760 new(ctx
) ir_dereference_variable(tmp
);
1761 ir_assignment
*const then_assign
=
1762 new(ctx
) ir_assignment(then_deref
, op
[1]);
1763 stmt
->then_instructions
.push_tail(then_assign
);
1765 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1766 ir_dereference
*const else_deref
=
1767 new(ctx
) ir_dereference_variable(tmp
);
1768 ir_assignment
*const else_assign
=
1769 new(ctx
) ir_assignment(else_deref
, op
[2]);
1770 stmt
->else_instructions
.push_tail(else_assign
);
1772 result
= new(ctx
) ir_dereference_variable(tmp
);
1779 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1780 ? "pre-increment operation" : "pre-decrement operation";
1782 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1783 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1785 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1787 ir_rvalue
*temp_rhs
;
1788 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1792 do_assignment(instructions
, state
,
1793 this->subexpressions
[0]->non_lvalue_description
,
1794 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1795 &result
, needs_rvalue
, false,
1796 this->subexpressions
[0]->get_location());
1801 case ast_post_dec
: {
1802 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1803 ? "post-increment operation" : "post-decrement operation";
1804 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1805 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1807 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1809 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1811 ir_rvalue
*temp_rhs
;
1812 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1815 /* Get a temporary of a copy of the lvalue before it's modified.
1816 * This may get thrown away later.
1818 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1820 ir_rvalue
*junk_rvalue
;
1822 do_assignment(instructions
, state
,
1823 this->subexpressions
[0]->non_lvalue_description
,
1824 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1825 &junk_rvalue
, false, false,
1826 this->subexpressions
[0]->get_location());
1831 case ast_field_selection
:
1832 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1835 case ast_array_index
: {
1836 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1838 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1839 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1841 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1844 if (result
->type
->is_error())
1845 error_emitted
= true;
1850 case ast_unsized_array_dim
:
1851 assert(!"ast_unsized_array_dim: Should never get here.");
1854 case ast_function_call
:
1855 /* Should *NEVER* get here. ast_function_call should always be handled
1856 * by ast_function_expression::hir.
1861 case ast_identifier
: {
1862 /* ast_identifier can appear several places in a full abstract syntax
1863 * tree. This particular use must be at location specified in the grammar
1864 * as 'variable_identifier'.
1867 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1870 var
->data
.used
= true;
1871 result
= new(ctx
) ir_dereference_variable(var
);
1873 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1874 this->primary_expression
.identifier
);
1876 result
= ir_rvalue::error_value(ctx
);
1877 error_emitted
= true;
1882 case ast_int_constant
:
1883 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1886 case ast_uint_constant
:
1887 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1890 case ast_float_constant
:
1891 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1894 case ast_bool_constant
:
1895 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1898 case ast_double_constant
:
1899 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1902 case ast_sequence
: {
1903 /* It should not be possible to generate a sequence in the AST without
1904 * any expressions in it.
1906 assert(!this->expressions
.is_empty());
1908 /* The r-value of a sequence is the last expression in the sequence. If
1909 * the other expressions in the sequence do not have side-effects (and
1910 * therefore add instructions to the instruction list), they get dropped
1913 exec_node
*previous_tail_pred
= NULL
;
1914 YYLTYPE previous_operand_loc
= loc
;
1916 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1917 /* If one of the operands of comma operator does not generate any
1918 * code, we want to emit a warning. At each pass through the loop
1919 * previous_tail_pred will point to the last instruction in the
1920 * stream *before* processing the previous operand. Naturally,
1921 * instructions->tail_pred will point to the last instruction in the
1922 * stream *after* processing the previous operand. If the two
1923 * pointers match, then the previous operand had no effect.
1925 * The warning behavior here differs slightly from GCC. GCC will
1926 * only emit a warning if none of the left-hand operands have an
1927 * effect. However, it will emit a warning for each. I believe that
1928 * there are some cases in C (especially with GCC extensions) where
1929 * it is useful to have an intermediate step in a sequence have no
1930 * effect, but I don't think these cases exist in GLSL. Either way,
1931 * it would be a giant hassle to replicate that behavior.
1933 if (previous_tail_pred
== instructions
->tail_pred
) {
1934 _mesa_glsl_warning(&previous_operand_loc
, state
,
1935 "left-hand operand of comma expression has "
1939 /* tail_pred is directly accessed instead of using the get_tail()
1940 * method for performance reasons. get_tail() has extra code to
1941 * return NULL when the list is empty. We don't care about that
1942 * here, so using tail_pred directly is fine.
1944 previous_tail_pred
= instructions
->tail_pred
;
1945 previous_operand_loc
= ast
->get_location();
1947 result
= ast
->hir(instructions
, state
);
1950 /* Any errors should have already been emitted in the loop above.
1952 error_emitted
= true;
1956 type
= NULL
; /* use result->type, not type. */
1957 assert(result
!= NULL
|| !needs_rvalue
);
1959 if (result
&& result
->type
->is_error() && !error_emitted
)
1960 _mesa_glsl_error(& loc
, state
, "type mismatch");
1966 ast_expression::has_sequence_subexpression() const
1968 switch (this->oper
) {
1977 return this->subexpressions
[0]->has_sequence_subexpression();
1999 case ast_array_index
:
2000 case ast_mul_assign
:
2001 case ast_div_assign
:
2002 case ast_add_assign
:
2003 case ast_sub_assign
:
2004 case ast_mod_assign
:
2007 case ast_and_assign
:
2008 case ast_xor_assign
:
2010 return this->subexpressions
[0]->has_sequence_subexpression() ||
2011 this->subexpressions
[1]->has_sequence_subexpression();
2013 case ast_conditional
:
2014 return this->subexpressions
[0]->has_sequence_subexpression() ||
2015 this->subexpressions
[1]->has_sequence_subexpression() ||
2016 this->subexpressions
[2]->has_sequence_subexpression();
2021 case ast_field_selection
:
2022 case ast_identifier
:
2023 case ast_int_constant
:
2024 case ast_uint_constant
:
2025 case ast_float_constant
:
2026 case ast_bool_constant
:
2027 case ast_double_constant
:
2031 unreachable("ast_aggregate: Should never get here.");
2033 case ast_function_call
:
2034 unreachable("should be handled by ast_function_expression::hir");
2036 case ast_unsized_array_dim
:
2037 unreachable("ast_unsized_array_dim: Should never get here.");
2044 ast_expression_statement::hir(exec_list
*instructions
,
2045 struct _mesa_glsl_parse_state
*state
)
2047 /* It is possible to have expression statements that don't have an
2048 * expression. This is the solitary semicolon:
2050 * for (i = 0; i < 5; i++)
2053 * In this case the expression will be NULL. Test for NULL and don't do
2054 * anything in that case.
2056 if (expression
!= NULL
)
2057 expression
->hir_no_rvalue(instructions
, state
);
2059 /* Statements do not have r-values.
2066 ast_compound_statement::hir(exec_list
*instructions
,
2067 struct _mesa_glsl_parse_state
*state
)
2070 state
->symbols
->push_scope();
2072 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2073 ast
->hir(instructions
, state
);
2076 state
->symbols
->pop_scope();
2078 /* Compound statements do not have r-values.
2084 * Evaluate the given exec_node (which should be an ast_node representing
2085 * a single array dimension) and return its integer value.
2088 process_array_size(exec_node
*node
,
2089 struct _mesa_glsl_parse_state
*state
)
2091 exec_list dummy_instructions
;
2093 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2096 * Dimensions other than the outermost dimension can by unsized if they
2097 * are immediately sized by a constructor or initializer.
2099 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2102 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2103 YYLTYPE loc
= array_size
->get_location();
2106 _mesa_glsl_error(& loc
, state
,
2107 "array size could not be resolved");
2111 if (!ir
->type
->is_integer()) {
2112 _mesa_glsl_error(& loc
, state
,
2113 "array size must be integer type");
2117 if (!ir
->type
->is_scalar()) {
2118 _mesa_glsl_error(& loc
, state
,
2119 "array size must be scalar type");
2123 ir_constant
*const size
= ir
->constant_expression_value();
2124 if (size
== NULL
|| array_size
->has_sequence_subexpression()) {
2125 _mesa_glsl_error(& loc
, state
, "array size must be a "
2126 "constant valued expression");
2130 if (size
->value
.i
[0] <= 0) {
2131 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2135 assert(size
->type
== ir
->type
);
2137 /* If the array size is const (and we've verified that
2138 * it is) then no instructions should have been emitted
2139 * when we converted it to HIR. If they were emitted,
2140 * then either the array size isn't const after all, or
2141 * we are emitting unnecessary instructions.
2143 assert(dummy_instructions
.is_empty());
2145 return size
->value
.u
[0];
2148 static const glsl_type
*
2149 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2150 ast_array_specifier
*array_specifier
,
2151 struct _mesa_glsl_parse_state
*state
)
2153 const glsl_type
*array_type
= base
;
2155 if (array_specifier
!= NULL
) {
2156 if (base
->is_array()) {
2158 /* From page 19 (page 25) of the GLSL 1.20 spec:
2160 * "Only one-dimensional arrays may be declared."
2162 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2163 return glsl_type::error_type
;
2167 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2168 !node
->is_head_sentinel(); node
= node
->prev
) {
2169 unsigned array_size
= process_array_size(node
, state
);
2170 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2178 precision_qualifier_allowed(const glsl_type
*type
)
2180 /* Precision qualifiers apply to floating point, integer and opaque
2183 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2184 * "Any floating point or any integer declaration can have the type
2185 * preceded by one of these precision qualifiers [...] Literal
2186 * constants do not have precision qualifiers. Neither do Boolean
2189 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2192 * "Precision qualifiers are added for code portability with OpenGL
2193 * ES, not for functionality. They have the same syntax as in OpenGL
2196 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2198 * "uniform lowp sampler2D sampler;
2201 * lowp vec4 col = texture2D (sampler, coord);
2202 * // texture2D returns lowp"
2204 * From this, we infer that GLSL 1.30 (and later) should allow precision
2205 * qualifiers on sampler types just like float and integer types.
2207 return (type
->is_float()
2208 || type
->is_integer()
2209 || type
->contains_opaque())
2210 && !type
->without_array()->is_record();
2214 ast_type_specifier::glsl_type(const char **name
,
2215 struct _mesa_glsl_parse_state
*state
) const
2217 const struct glsl_type
*type
;
2219 type
= state
->symbols
->get_type(this->type_name
);
2220 *name
= this->type_name
;
2222 YYLTYPE loc
= this->get_location();
2223 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2229 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2231 * "The precision statement
2233 * precision precision-qualifier type;
2235 * can be used to establish a default precision qualifier. The type field can
2236 * be either int or float or any of the sampler types, (...) If type is float,
2237 * the directive applies to non-precision-qualified floating point type
2238 * (scalar, vector, and matrix) declarations. If type is int, the directive
2239 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2240 * and unsigned) declarations."
2242 * We use the symbol table to keep the values of the default precisions for
2243 * each 'type' in each scope and we use the 'type' string from the precision
2244 * statement as key in the symbol table. When we want to retrieve the default
2245 * precision associated with a given glsl_type we need to know the type string
2246 * associated with it. This is what this function returns.
2249 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2251 switch (type
->base_type
) {
2252 case GLSL_TYPE_FLOAT
:
2254 case GLSL_TYPE_UINT
:
2257 case GLSL_TYPE_ATOMIC_UINT
:
2258 return "atomic_uint";
2259 case GLSL_TYPE_IMAGE
:
2261 case GLSL_TYPE_SAMPLER
: {
2262 const unsigned type_idx
=
2263 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2264 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2265 assert(type_idx
< 4);
2266 switch (type
->sampler_type
) {
2267 case GLSL_TYPE_FLOAT
:
2268 switch (type
->sampler_dimensionality
) {
2269 case GLSL_SAMPLER_DIM_1D
: {
2270 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2271 static const char *const names
[4] = {
2272 "sampler1D", "sampler1DArray",
2273 "sampler1DShadow", "sampler1DArrayShadow"
2275 return names
[type_idx
];
2277 case GLSL_SAMPLER_DIM_2D
: {
2278 static const char *const names
[8] = {
2279 "sampler2D", "sampler2DArray",
2280 "sampler2DShadow", "sampler2DArrayShadow",
2281 "image2D", "image2DArray", NULL
, NULL
2283 return names
[offset
+ type_idx
];
2285 case GLSL_SAMPLER_DIM_3D
: {
2286 static const char *const names
[8] = {
2287 "sampler3D", NULL
, NULL
, NULL
,
2288 "image3D", NULL
, NULL
, NULL
2290 return names
[offset
+ type_idx
];
2292 case GLSL_SAMPLER_DIM_CUBE
: {
2293 static const char *const names
[8] = {
2294 "samplerCube", "samplerCubeArray",
2295 "samplerCubeShadow", "samplerCubeArrayShadow",
2296 "imageCube", NULL
, NULL
, NULL
2298 return names
[offset
+ type_idx
];
2300 case GLSL_SAMPLER_DIM_MS
: {
2301 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2302 static const char *const names
[4] = {
2303 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2305 return names
[type_idx
];
2307 case GLSL_SAMPLER_DIM_RECT
: {
2308 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2309 static const char *const names
[4] = {
2310 "samplerRect", NULL
, "samplerRectShadow", NULL
2312 return names
[type_idx
];
2314 case GLSL_SAMPLER_DIM_BUF
: {
2315 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2316 static const char *const names
[4] = {
2317 "samplerBuffer", NULL
, NULL
, NULL
2319 return names
[type_idx
];
2321 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2322 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2323 static const char *const names
[4] = {
2324 "samplerExternalOES", NULL
, NULL
, NULL
2326 return names
[type_idx
];
2329 unreachable("Unsupported sampler/image dimensionality");
2330 } /* sampler/image float dimensionality */
2333 switch (type
->sampler_dimensionality
) {
2334 case GLSL_SAMPLER_DIM_1D
: {
2335 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2336 static const char *const names
[4] = {
2337 "isampler1D", "isampler1DArray", NULL
, NULL
2339 return names
[type_idx
];
2341 case GLSL_SAMPLER_DIM_2D
: {
2342 static const char *const names
[8] = {
2343 "isampler2D", "isampler2DArray", NULL
, NULL
,
2344 "iimage2D", "iimage2DArray", NULL
, NULL
2346 return names
[offset
+ type_idx
];
2348 case GLSL_SAMPLER_DIM_3D
: {
2349 static const char *const names
[8] = {
2350 "isampler3D", NULL
, NULL
, NULL
,
2351 "iimage3D", NULL
, NULL
, NULL
2353 return names
[offset
+ type_idx
];
2355 case GLSL_SAMPLER_DIM_CUBE
: {
2356 static const char *const names
[8] = {
2357 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2358 "iimageCube", NULL
, NULL
, NULL
2360 return names
[offset
+ type_idx
];
2362 case GLSL_SAMPLER_DIM_MS
: {
2363 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2364 static const char *const names
[4] = {
2365 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2367 return names
[type_idx
];
2369 case GLSL_SAMPLER_DIM_RECT
: {
2370 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2371 static const char *const names
[4] = {
2372 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2374 return names
[type_idx
];
2376 case GLSL_SAMPLER_DIM_BUF
: {
2377 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2378 static const char *const names
[4] = {
2379 "isamplerBuffer", NULL
, NULL
, NULL
2381 return names
[type_idx
];
2384 unreachable("Unsupported isampler/iimage dimensionality");
2385 } /* sampler/image int dimensionality */
2387 case GLSL_TYPE_UINT
:
2388 switch (type
->sampler_dimensionality
) {
2389 case GLSL_SAMPLER_DIM_1D
: {
2390 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2391 static const char *const names
[4] = {
2392 "usampler1D", "usampler1DArray", NULL
, NULL
2394 return names
[type_idx
];
2396 case GLSL_SAMPLER_DIM_2D
: {
2397 static const char *const names
[8] = {
2398 "usampler2D", "usampler2DArray", NULL
, NULL
,
2399 "uimage2D", "uimage2DArray", NULL
, NULL
2401 return names
[offset
+ type_idx
];
2403 case GLSL_SAMPLER_DIM_3D
: {
2404 static const char *const names
[8] = {
2405 "usampler3D", NULL
, NULL
, NULL
,
2406 "uimage3D", NULL
, NULL
, NULL
2408 return names
[offset
+ type_idx
];
2410 case GLSL_SAMPLER_DIM_CUBE
: {
2411 static const char *const names
[8] = {
2412 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2413 "uimageCube", NULL
, NULL
, NULL
2415 return names
[offset
+ type_idx
];
2417 case GLSL_SAMPLER_DIM_MS
: {
2418 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2419 static const char *const names
[4] = {
2420 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2422 return names
[type_idx
];
2424 case GLSL_SAMPLER_DIM_RECT
: {
2425 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2426 static const char *const names
[4] = {
2427 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2429 return names
[type_idx
];
2431 case GLSL_SAMPLER_DIM_BUF
: {
2432 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2433 static const char *const names
[4] = {
2434 "usamplerBuffer", NULL
, NULL
, NULL
2436 return names
[type_idx
];
2439 unreachable("Unsupported usampler/uimage dimensionality");
2440 } /* sampler/image uint dimensionality */
2443 unreachable("Unsupported sampler/image type");
2444 } /* sampler/image type */
2446 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2449 unreachable("Unsupported type");
2454 select_gles_precision(unsigned qual_precision
,
2455 const glsl_type
*type
,
2456 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2458 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2459 * In GLES we take the precision from the type qualifier if present,
2460 * otherwise, if the type of the variable allows precision qualifiers at
2461 * all, we look for the default precision qualifier for that type in the
2464 assert(state
->es_shader
);
2466 unsigned precision
= GLSL_PRECISION_NONE
;
2467 if (qual_precision
) {
2468 precision
= qual_precision
;
2469 } else if (precision_qualifier_allowed(type
)) {
2470 const char *type_name
=
2471 get_type_name_for_precision_qualifier(type
->without_array());
2472 assert(type_name
!= NULL
);
2475 state
->symbols
->get_default_precision_qualifier(type_name
);
2476 if (precision
== ast_precision_none
) {
2477 _mesa_glsl_error(loc
, state
,
2478 "No precision specified in this scope for type `%s'",
2486 ast_fully_specified_type::glsl_type(const char **name
,
2487 struct _mesa_glsl_parse_state
*state
) const
2489 return this->specifier
->glsl_type(name
, state
);
2493 * Determine whether a toplevel variable declaration declares a varying. This
2494 * function operates by examining the variable's mode and the shader target,
2495 * so it correctly identifies linkage variables regardless of whether they are
2496 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2498 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2499 * this function will produce undefined results.
2502 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2505 case MESA_SHADER_VERTEX
:
2506 return var
->data
.mode
== ir_var_shader_out
;
2507 case MESA_SHADER_FRAGMENT
:
2508 return var
->data
.mode
== ir_var_shader_in
;
2510 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2516 * Matrix layout qualifiers are only allowed on certain types
2519 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2521 const glsl_type
*type
,
2524 if (var
&& !var
->is_in_buffer_block()) {
2525 /* Layout qualifiers may only apply to interface blocks and fields in
2528 _mesa_glsl_error(loc
, state
,
2529 "uniform block layout qualifiers row_major and "
2530 "column_major may not be applied to variables "
2531 "outside of uniform blocks");
2532 } else if (!type
->without_array()->is_matrix()) {
2533 /* The OpenGL ES 3.0 conformance tests did not originally allow
2534 * matrix layout qualifiers on non-matrices. However, the OpenGL
2535 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2536 * amended to specifically allow these layouts on all types. Emit
2537 * a warning so that people know their code may not be portable.
2539 _mesa_glsl_warning(loc
, state
,
2540 "uniform block layout qualifiers row_major and "
2541 "column_major applied to non-matrix types may "
2542 "be rejected by older compilers");
2547 process_qualifier_constant(struct _mesa_glsl_parse_state
*state
,
2549 const char *qual_indentifier
,
2550 ast_expression
*const_expression
,
2553 exec_list dummy_instructions
;
2555 if (const_expression
== NULL
) {
2560 ir_rvalue
*const ir
= const_expression
->hir(&dummy_instructions
, state
);
2562 ir_constant
*const const_int
= ir
->constant_expression_value();
2563 if (const_int
== NULL
|| !const_int
->type
->is_integer()) {
2564 _mesa_glsl_error(loc
, state
, "%s must be an integral constant "
2565 "expression", qual_indentifier
);
2569 if (const_int
->value
.i
[0] < 0) {
2570 _mesa_glsl_error(loc
, state
, "%s layout qualifier is invalid (%d < 0)",
2571 qual_indentifier
, const_int
->value
.u
[0]);
2575 /* If the location is const (and we've verified that
2576 * it is) then no instructions should have been emitted
2577 * when we converted it to HIR. If they were emitted,
2578 * then either the location isn't const after all, or
2579 * we are emitting unnecessary instructions.
2581 assert(dummy_instructions
.is_empty());
2583 *value
= const_int
->value
.u
[0];
2588 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2591 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2592 _mesa_glsl_error(loc
, state
,
2593 "invalid stream specified %d is larger than "
2594 "MAX_VERTEX_STREAMS - 1 (%d).",
2595 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2603 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2606 const glsl_type
*type
,
2607 const ast_type_qualifier
*qual
)
2609 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2610 _mesa_glsl_error(loc
, state
,
2611 "the \"binding\" qualifier only applies to uniforms and "
2612 "shader storage buffer objects");
2616 unsigned qual_binding
;
2617 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2622 const struct gl_context
*const ctx
= state
->ctx
;
2623 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2624 unsigned max_index
= qual_binding
+ elements
- 1;
2625 const glsl_type
*base_type
= type
->without_array();
2627 if (base_type
->is_interface()) {
2628 /* UBOs. From page 60 of the GLSL 4.20 specification:
2629 * "If the binding point for any uniform block instance is less than zero,
2630 * or greater than or equal to the implementation-dependent maximum
2631 * number of uniform buffer bindings, a compilation error will occur.
2632 * When the binding identifier is used with a uniform block instanced as
2633 * an array of size N, all elements of the array from binding through
2634 * binding + N – 1 must be within this range."
2636 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2638 if (qual
->flags
.q
.uniform
&&
2639 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2640 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2641 "the maximum number of UBO binding points (%d)",
2642 qual_binding
, elements
,
2643 ctx
->Const
.MaxUniformBufferBindings
);
2647 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2648 * "If the binding point for any uniform or shader storage block instance
2649 * is less than zero, or greater than or equal to the
2650 * implementation-dependent maximum number of uniform buffer bindings, a
2651 * compile-time error will occur. When the binding identifier is used
2652 * with a uniform or shader storage block instanced as an array of size
2653 * N, all elements of the array from binding through binding + N – 1 must
2654 * be within this range."
2656 if (qual
->flags
.q
.buffer
&&
2657 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2658 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2659 "the maximum number of SSBO binding points (%d)",
2660 qual_binding
, elements
,
2661 ctx
->Const
.MaxShaderStorageBufferBindings
);
2664 } else if (base_type
->is_sampler()) {
2665 /* Samplers. From page 63 of the GLSL 4.20 specification:
2666 * "If the binding is less than zero, or greater than or equal to the
2667 * implementation-dependent maximum supported number of units, a
2668 * compilation error will occur. When the binding identifier is used
2669 * with an array of size N, all elements of the array from binding
2670 * through binding + N - 1 must be within this range."
2672 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2674 if (max_index
>= limit
) {
2675 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2676 "exceeds the maximum number of texture image units "
2677 "(%u)", qual_binding
, elements
, limit
);
2681 } else if (base_type
->contains_atomic()) {
2682 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2683 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2684 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2685 " maximum number of atomic counter buffer bindings"
2686 "(%u)", qual_binding
,
2687 ctx
->Const
.MaxAtomicBufferBindings
);
2691 } else if ((state
->is_version(420, 310) ||
2692 state
->ARB_shading_language_420pack_enable
) &&
2693 base_type
->is_image()) {
2694 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2695 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2696 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2697 " maximum number of image units (%d)", max_index
,
2698 ctx
->Const
.MaxImageUnits
);
2703 _mesa_glsl_error(loc
, state
,
2704 "the \"binding\" qualifier only applies to uniform "
2705 "blocks, opaque variables, or arrays thereof");
2709 var
->data
.explicit_binding
= true;
2710 var
->data
.binding
= qual_binding
;
2716 static glsl_interp_qualifier
2717 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2718 ir_variable_mode mode
,
2719 struct _mesa_glsl_parse_state
*state
,
2722 glsl_interp_qualifier interpolation
;
2723 if (qual
->flags
.q
.flat
)
2724 interpolation
= INTERP_QUALIFIER_FLAT
;
2725 else if (qual
->flags
.q
.noperspective
)
2726 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2727 else if (qual
->flags
.q
.smooth
)
2728 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2730 interpolation
= INTERP_QUALIFIER_NONE
;
2732 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2733 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2734 _mesa_glsl_error(loc
, state
,
2735 "interpolation qualifier `%s' can only be applied to "
2736 "shader inputs or outputs.",
2737 interpolation_string(interpolation
));
2741 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2742 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2743 _mesa_glsl_error(loc
, state
,
2744 "interpolation qualifier `%s' cannot be applied to "
2745 "vertex shader inputs or fragment shader outputs",
2746 interpolation_string(interpolation
));
2750 return interpolation
;
2755 apply_explicit_location(const struct ast_type_qualifier
*qual
,
2757 struct _mesa_glsl_parse_state
*state
,
2762 unsigned qual_location
;
2763 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
2768 /* Checks for GL_ARB_explicit_uniform_location. */
2769 if (qual
->flags
.q
.uniform
) {
2770 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2773 const struct gl_context
*const ctx
= state
->ctx
;
2774 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
2776 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2777 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2778 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2779 ctx
->Const
.MaxUserAssignableUniformLocations
);
2783 var
->data
.explicit_location
= true;
2784 var
->data
.location
= qual_location
;
2788 /* Between GL_ARB_explicit_attrib_location an
2789 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2790 * stage can be assigned explicit locations. The checking here associates
2791 * the correct extension with the correct stage's input / output:
2795 * vertex explicit_loc sso
2796 * tess control sso sso
2799 * fragment sso explicit_loc
2801 switch (state
->stage
) {
2802 case MESA_SHADER_VERTEX
:
2803 if (var
->data
.mode
== ir_var_shader_in
) {
2804 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2810 if (var
->data
.mode
== ir_var_shader_out
) {
2811 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2820 case MESA_SHADER_TESS_CTRL
:
2821 case MESA_SHADER_TESS_EVAL
:
2822 case MESA_SHADER_GEOMETRY
:
2823 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2824 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2833 case MESA_SHADER_FRAGMENT
:
2834 if (var
->data
.mode
== ir_var_shader_in
) {
2835 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2841 if (var
->data
.mode
== ir_var_shader_out
) {
2842 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2851 case MESA_SHADER_COMPUTE
:
2852 _mesa_glsl_error(loc
, state
,
2853 "compute shader variables cannot be given "
2854 "explicit locations");
2859 _mesa_glsl_error(loc
, state
,
2860 "%s cannot be given an explicit location in %s shader",
2862 _mesa_shader_stage_to_string(state
->stage
));
2864 var
->data
.explicit_location
= true;
2866 switch (state
->stage
) {
2867 case MESA_SHADER_VERTEX
:
2868 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2869 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
2870 : (qual_location
+ VARYING_SLOT_VAR0
);
2873 case MESA_SHADER_TESS_CTRL
:
2874 case MESA_SHADER_TESS_EVAL
:
2875 case MESA_SHADER_GEOMETRY
:
2876 if (var
->data
.patch
)
2877 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
2879 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
2882 case MESA_SHADER_FRAGMENT
:
2883 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2884 ? (qual_location
+ FRAG_RESULT_DATA0
)
2885 : (qual_location
+ VARYING_SLOT_VAR0
);
2887 case MESA_SHADER_COMPUTE
:
2888 assert(!"Unexpected shader type");
2892 /* Check if index was set for the uniform instead of the function */
2893 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
2894 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
2895 "used with subroutine functions");
2899 unsigned qual_index
;
2900 if (qual
->flags
.q
.explicit_index
&&
2901 process_qualifier_constant(state
, loc
, "index", qual
->index
,
2903 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2904 * Layout Qualifiers):
2906 * "It is also a compile-time error if a fragment shader
2907 * sets a layout index to less than 0 or greater than 1."
2909 * Older specifications don't mandate a behavior; we take
2910 * this as a clarification and always generate the error.
2912 if (qual_index
> 1) {
2913 _mesa_glsl_error(loc
, state
,
2914 "explicit index may only be 0 or 1");
2916 var
->data
.explicit_index
= true;
2917 var
->data
.index
= qual_index
;
2924 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2926 struct _mesa_glsl_parse_state
*state
,
2929 const glsl_type
*base_type
= var
->type
->without_array();
2931 if (base_type
->is_image()) {
2932 if (var
->data
.mode
!= ir_var_uniform
&&
2933 var
->data
.mode
!= ir_var_function_in
) {
2934 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2935 "function parameters or uniform-qualified "
2936 "global variables");
2939 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2940 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2941 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2942 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2943 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2944 var
->data
.read_only
= true;
2946 if (qual
->flags
.q
.explicit_image_format
) {
2947 if (var
->data
.mode
== ir_var_function_in
) {
2948 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2949 "used on image function parameters");
2952 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2953 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2954 "base data type of the image");
2957 var
->data
.image_format
= qual
->image_format
;
2959 if (var
->data
.mode
== ir_var_uniform
) {
2960 if (state
->es_shader
) {
2961 _mesa_glsl_error(loc
, state
, "all image uniforms "
2962 "must have a format layout qualifier");
2964 } else if (!qual
->flags
.q
.write_only
) {
2965 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2966 "`writeonly' must have a format layout "
2971 var
->data
.image_format
= GL_NONE
;
2974 /* From page 70 of the GLSL ES 3.1 specification:
2976 * "Except for image variables qualified with the format qualifiers
2977 * r32f, r32i, and r32ui, image variables must specify either memory
2978 * qualifier readonly or the memory qualifier writeonly."
2980 if (state
->es_shader
&&
2981 var
->data
.image_format
!= GL_R32F
&&
2982 var
->data
.image_format
!= GL_R32I
&&
2983 var
->data
.image_format
!= GL_R32UI
&&
2984 !var
->data
.image_read_only
&&
2985 !var
->data
.image_write_only
) {
2986 _mesa_glsl_error(loc
, state
, "image variables of format other than "
2987 "r32f, r32i or r32ui must be qualified `readonly' or "
2991 } else if (qual
->flags
.q
.read_only
||
2992 qual
->flags
.q
.write_only
||
2993 qual
->flags
.q
.coherent
||
2994 qual
->flags
.q
._volatile
||
2995 qual
->flags
.q
.restrict_flag
||
2996 qual
->flags
.q
.explicit_image_format
) {
2997 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3002 static inline const char*
3003 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3005 if (origin_upper_left
&& pixel_center_integer
)
3006 return "origin_upper_left, pixel_center_integer";
3007 else if (origin_upper_left
)
3008 return "origin_upper_left";
3009 else if (pixel_center_integer
)
3010 return "pixel_center_integer";
3016 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3017 const struct ast_type_qualifier
*qual
)
3019 /* If gl_FragCoord was previously declared, and the qualifiers were
3020 * different in any way, return true.
3022 if (state
->fs_redeclares_gl_fragcoord
) {
3023 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3024 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3031 validate_array_dimensions(const glsl_type
*t
,
3032 struct _mesa_glsl_parse_state
*state
,
3034 if (t
->is_array()) {
3035 t
= t
->fields
.array
;
3036 while (t
->is_array()) {
3037 if (t
->is_unsized_array()) {
3038 _mesa_glsl_error(loc
, state
,
3039 "only the outermost array dimension can "
3044 t
= t
->fields
.array
;
3050 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3052 struct _mesa_glsl_parse_state
*state
,
3055 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3057 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3059 * "Within any shader, the first redeclarations of gl_FragCoord
3060 * must appear before any use of gl_FragCoord."
3062 * Generate a compiler error if above condition is not met by the
3065 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3066 if (earlier
!= NULL
&&
3067 earlier
->data
.used
&&
3068 !state
->fs_redeclares_gl_fragcoord
) {
3069 _mesa_glsl_error(loc
, state
,
3070 "gl_FragCoord used before its first redeclaration "
3071 "in fragment shader");
3074 /* Make sure all gl_FragCoord redeclarations specify the same layout
3077 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3078 const char *const qual_string
=
3079 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3080 qual
->flags
.q
.pixel_center_integer
);
3082 const char *const state_string
=
3083 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3084 state
->fs_pixel_center_integer
);
3086 _mesa_glsl_error(loc
, state
,
3087 "gl_FragCoord redeclared with different layout "
3088 "qualifiers (%s) and (%s) ",
3092 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3093 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3094 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3095 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3096 state
->fs_redeclares_gl_fragcoord
=
3097 state
->fs_origin_upper_left
||
3098 state
->fs_pixel_center_integer
||
3099 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3102 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3103 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3104 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3105 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3106 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3107 ? "origin_upper_left" : "pixel_center_integer";
3109 _mesa_glsl_error(loc
, state
,
3110 "layout qualifier `%s' can only be applied to "
3111 "fragment shader input `gl_FragCoord'",
3115 if (qual
->flags
.q
.explicit_location
) {
3116 apply_explicit_location(qual
, var
, state
, loc
);
3117 } else if (qual
->flags
.q
.explicit_index
) {
3118 if (!qual
->flags
.q
.subroutine_def
)
3119 _mesa_glsl_error(loc
, state
,
3120 "explicit index requires explicit location");
3123 if (qual
->flags
.q
.explicit_binding
) {
3124 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3127 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3128 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3129 unsigned qual_stream
;
3130 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3132 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3133 var
->data
.stream
= qual_stream
;
3137 if (var
->type
->contains_atomic()) {
3138 if (var
->data
.mode
== ir_var_uniform
) {
3139 if (var
->data
.explicit_binding
) {
3141 &state
->atomic_counter_offsets
[var
->data
.binding
];
3143 if (*offset
% ATOMIC_COUNTER_SIZE
)
3144 _mesa_glsl_error(loc
, state
,
3145 "misaligned atomic counter offset");
3147 var
->data
.offset
= *offset
;
3148 *offset
+= var
->type
->atomic_size();
3151 _mesa_glsl_error(loc
, state
,
3152 "atomic counters require explicit binding point");
3154 } else if (var
->data
.mode
!= ir_var_function_in
) {
3155 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3156 "function parameters or uniform-qualified "
3157 "global variables");
3161 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3162 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3163 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3164 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3165 * These extensions and all following extensions that add the 'layout'
3166 * keyword have been modified to require the use of 'in' or 'out'.
3168 * The following extension do not allow the deprecated keywords:
3170 * GL_AMD_conservative_depth
3171 * GL_ARB_conservative_depth
3172 * GL_ARB_gpu_shader5
3173 * GL_ARB_separate_shader_objects
3174 * GL_ARB_tessellation_shader
3175 * GL_ARB_transform_feedback3
3176 * GL_ARB_uniform_buffer_object
3178 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3179 * allow layout with the deprecated keywords.
3181 const bool relaxed_layout_qualifier_checking
=
3182 state
->ARB_fragment_coord_conventions_enable
;
3184 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3185 || qual
->flags
.q
.varying
;
3186 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3187 if (relaxed_layout_qualifier_checking
) {
3188 _mesa_glsl_warning(loc
, state
,
3189 "`layout' qualifier may not be used with "
3190 "`attribute' or `varying'");
3192 _mesa_glsl_error(loc
, state
,
3193 "`layout' qualifier may not be used with "
3194 "`attribute' or `varying'");
3198 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3199 * AMD_conservative_depth.
3201 int depth_layout_count
= qual
->flags
.q
.depth_any
3202 + qual
->flags
.q
.depth_greater
3203 + qual
->flags
.q
.depth_less
3204 + qual
->flags
.q
.depth_unchanged
;
3205 if (depth_layout_count
> 0
3206 && !state
->AMD_conservative_depth_enable
3207 && !state
->ARB_conservative_depth_enable
) {
3208 _mesa_glsl_error(loc
, state
,
3209 "extension GL_AMD_conservative_depth or "
3210 "GL_ARB_conservative_depth must be enabled "
3211 "to use depth layout qualifiers");
3212 } else if (depth_layout_count
> 0
3213 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3214 _mesa_glsl_error(loc
, state
,
3215 "depth layout qualifiers can be applied only to "
3217 } else if (depth_layout_count
> 1
3218 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3219 _mesa_glsl_error(loc
, state
,
3220 "at most one depth layout qualifier can be applied to "
3223 if (qual
->flags
.q
.depth_any
)
3224 var
->data
.depth_layout
= ir_depth_layout_any
;
3225 else if (qual
->flags
.q
.depth_greater
)
3226 var
->data
.depth_layout
= ir_depth_layout_greater
;
3227 else if (qual
->flags
.q
.depth_less
)
3228 var
->data
.depth_layout
= ir_depth_layout_less
;
3229 else if (qual
->flags
.q
.depth_unchanged
)
3230 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3232 var
->data
.depth_layout
= ir_depth_layout_none
;
3234 if (qual
->flags
.q
.std140
||
3235 qual
->flags
.q
.std430
||
3236 qual
->flags
.q
.packed
||
3237 qual
->flags
.q
.shared
) {
3238 _mesa_glsl_error(loc
, state
,
3239 "uniform and shader storage block layout qualifiers "
3240 "std140, std430, packed, and shared can only be "
3241 "applied to uniform or shader storage blocks, not "
3245 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3246 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3249 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3252 * "Fragment shaders also allow the following layout qualifier on in only
3253 * (not with variable declarations)
3254 * layout-qualifier-id
3255 * early_fragment_tests
3258 if (qual
->flags
.q
.early_fragment_tests
) {
3259 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3260 "valid in fragment shader input layout declaration.");
3265 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3267 struct _mesa_glsl_parse_state
*state
,
3271 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3273 if (qual
->flags
.q
.invariant
) {
3274 if (var
->data
.used
) {
3275 _mesa_glsl_error(loc
, state
,
3276 "variable `%s' may not be redeclared "
3277 "`invariant' after being used",
3280 var
->data
.invariant
= 1;
3284 if (qual
->flags
.q
.precise
) {
3285 if (var
->data
.used
) {
3286 _mesa_glsl_error(loc
, state
,
3287 "variable `%s' may not be redeclared "
3288 "`precise' after being used",
3291 var
->data
.precise
= 1;
3295 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3296 _mesa_glsl_error(loc
, state
,
3297 "`subroutine' may only be applied to uniforms, "
3298 "subroutine type declarations, or function definitions");
3301 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3302 || qual
->flags
.q
.uniform
3303 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3304 var
->data
.read_only
= 1;
3306 if (qual
->flags
.q
.centroid
)
3307 var
->data
.centroid
= 1;
3309 if (qual
->flags
.q
.sample
)
3310 var
->data
.sample
= 1;
3312 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3313 if (state
->es_shader
) {
3314 var
->data
.precision
=
3315 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3318 if (qual
->flags
.q
.patch
)
3319 var
->data
.patch
= 1;
3321 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3322 var
->type
= glsl_type::error_type
;
3323 _mesa_glsl_error(loc
, state
,
3324 "`attribute' variables may not be declared in the "
3326 _mesa_shader_stage_to_string(state
->stage
));
3329 /* Disallow layout qualifiers which may only appear on layout declarations. */
3330 if (qual
->flags
.q
.prim_type
) {
3331 _mesa_glsl_error(loc
, state
,
3332 "Primitive type may only be specified on GS input or output "
3333 "layout declaration, not on variables.");
3336 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3338 * "However, the const qualifier cannot be used with out or inout."
3340 * The same section of the GLSL 4.40 spec further clarifies this saying:
3342 * "The const qualifier cannot be used with out or inout, or a
3343 * compile-time error results."
3345 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3346 _mesa_glsl_error(loc
, state
,
3347 "`const' may not be applied to `out' or `inout' "
3348 "function parameters");
3351 /* If there is no qualifier that changes the mode of the variable, leave
3352 * the setting alone.
3354 assert(var
->data
.mode
!= ir_var_temporary
);
3355 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3356 var
->data
.mode
= ir_var_function_inout
;
3357 else if (qual
->flags
.q
.in
)
3358 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3359 else if (qual
->flags
.q
.attribute
3360 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3361 var
->data
.mode
= ir_var_shader_in
;
3362 else if (qual
->flags
.q
.out
)
3363 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3364 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3365 var
->data
.mode
= ir_var_shader_out
;
3366 else if (qual
->flags
.q
.uniform
)
3367 var
->data
.mode
= ir_var_uniform
;
3368 else if (qual
->flags
.q
.buffer
)
3369 var
->data
.mode
= ir_var_shader_storage
;
3370 else if (qual
->flags
.q
.shared_storage
)
3371 var
->data
.mode
= ir_var_shader_shared
;
3373 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3374 /* User-defined ins/outs are not permitted in compute shaders. */
3375 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3376 _mesa_glsl_error(loc
, state
,
3377 "user-defined input and output variables are not "
3378 "permitted in compute shaders");
3381 /* This variable is being used to link data between shader stages (in
3382 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3383 * that is allowed for such purposes.
3385 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3387 * "The varying qualifier can be used only with the data types
3388 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3391 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3392 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3394 * "Fragment inputs can only be signed and unsigned integers and
3395 * integer vectors, float, floating-point vectors, matrices, or
3396 * arrays of these. Structures cannot be input.
3398 * Similar text exists in the section on vertex shader outputs.
3400 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3401 * 3.00 spec allows structs as well. Varying structs are also allowed
3404 switch (var
->type
->get_scalar_type()->base_type
) {
3405 case GLSL_TYPE_FLOAT
:
3406 /* Ok in all GLSL versions */
3408 case GLSL_TYPE_UINT
:
3410 if (state
->is_version(130, 300))
3412 _mesa_glsl_error(loc
, state
,
3413 "varying variables must be of base type float in %s",
3414 state
->get_version_string());
3416 case GLSL_TYPE_STRUCT
:
3417 if (state
->is_version(150, 300))
3419 _mesa_glsl_error(loc
, state
,
3420 "varying variables may not be of type struct");
3422 case GLSL_TYPE_DOUBLE
:
3425 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3430 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3431 switch (state
->stage
) {
3432 case MESA_SHADER_VERTEX
:
3433 if (var
->data
.mode
== ir_var_shader_out
)
3434 var
->data
.invariant
= true;
3436 case MESA_SHADER_TESS_CTRL
:
3437 case MESA_SHADER_TESS_EVAL
:
3438 case MESA_SHADER_GEOMETRY
:
3439 if ((var
->data
.mode
== ir_var_shader_in
)
3440 || (var
->data
.mode
== ir_var_shader_out
))
3441 var
->data
.invariant
= true;
3443 case MESA_SHADER_FRAGMENT
:
3444 if (var
->data
.mode
== ir_var_shader_in
)
3445 var
->data
.invariant
= true;
3447 case MESA_SHADER_COMPUTE
:
3448 /* Invariance isn't meaningful in compute shaders. */
3453 var
->data
.interpolation
=
3454 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
3457 /* Does the declaration use the deprecated 'attribute' or 'varying'
3460 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3461 || qual
->flags
.q
.varying
;
3464 /* Validate auxiliary storage qualifiers */
3466 /* From section 4.3.4 of the GLSL 1.30 spec:
3467 * "It is an error to use centroid in in a vertex shader."
3469 * From section 4.3.4 of the GLSL ES 3.00 spec:
3470 * "It is an error to use centroid in or interpolation qualifiers in
3471 * a vertex shader input."
3474 /* Section 4.3.6 of the GLSL 1.30 specification states:
3475 * "It is an error to use centroid out in a fragment shader."
3477 * The GL_ARB_shading_language_420pack extension specification states:
3478 * "It is an error to use auxiliary storage qualifiers or interpolation
3479 * qualifiers on an output in a fragment shader."
3481 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3482 _mesa_glsl_error(loc
, state
,
3483 "sample qualifier may only be used on `in` or `out` "
3484 "variables between shader stages");
3486 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3487 _mesa_glsl_error(loc
, state
,
3488 "centroid qualifier may only be used with `in', "
3489 "`out' or `varying' variables between shader stages");
3492 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3493 _mesa_glsl_error(loc
, state
,
3494 "the shared storage qualifiers can only be used with "
3498 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3502 * Get the variable that is being redeclared by this declaration
3504 * Semantic checks to verify the validity of the redeclaration are also
3505 * performed. If semantic checks fail, compilation error will be emitted via
3506 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3509 * A pointer to an existing variable in the current scope if the declaration
3510 * is a redeclaration, \c NULL otherwise.
3512 static ir_variable
*
3513 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3514 struct _mesa_glsl_parse_state
*state
,
3515 bool allow_all_redeclarations
)
3517 /* Check if this declaration is actually a re-declaration, either to
3518 * resize an array or add qualifiers to an existing variable.
3520 * This is allowed for variables in the current scope, or when at
3521 * global scope (for built-ins in the implicit outer scope).
3523 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3524 if (earlier
== NULL
||
3525 (state
->current_function
!= NULL
&&
3526 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3531 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3533 * "It is legal to declare an array without a size and then
3534 * later re-declare the same name as an array of the same
3535 * type and specify a size."
3537 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3538 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3539 /* FINISHME: This doesn't match the qualifiers on the two
3540 * FINISHME: declarations. It's not 100% clear whether this is
3541 * FINISHME: required or not.
3544 const unsigned size
= unsigned(var
->type
->array_size());
3545 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3546 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3547 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3549 earlier
->data
.max_array_access
);
3552 earlier
->type
= var
->type
;
3555 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3556 state
->is_version(150, 0))
3557 && strcmp(var
->name
, "gl_FragCoord") == 0
3558 && earlier
->type
== var
->type
3559 && var
->data
.mode
== ir_var_shader_in
) {
3560 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3563 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3564 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3566 /* According to section 4.3.7 of the GLSL 1.30 spec,
3567 * the following built-in varaibles can be redeclared with an
3568 * interpolation qualifier:
3571 * * gl_FrontSecondaryColor
3572 * * gl_BackSecondaryColor
3574 * * gl_SecondaryColor
3576 } else if (state
->is_version(130, 0)
3577 && (strcmp(var
->name
, "gl_FrontColor") == 0
3578 || strcmp(var
->name
, "gl_BackColor") == 0
3579 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3580 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3581 || strcmp(var
->name
, "gl_Color") == 0
3582 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3583 && earlier
->type
== var
->type
3584 && earlier
->data
.mode
== var
->data
.mode
) {
3585 earlier
->data
.interpolation
= var
->data
.interpolation
;
3587 /* Layout qualifiers for gl_FragDepth. */
3588 } else if ((state
->AMD_conservative_depth_enable
||
3589 state
->ARB_conservative_depth_enable
)
3590 && strcmp(var
->name
, "gl_FragDepth") == 0
3591 && earlier
->type
== var
->type
3592 && earlier
->data
.mode
== var
->data
.mode
) {
3594 /** From the AMD_conservative_depth spec:
3595 * Within any shader, the first redeclarations of gl_FragDepth
3596 * must appear before any use of gl_FragDepth.
3598 if (earlier
->data
.used
) {
3599 _mesa_glsl_error(&loc
, state
,
3600 "the first redeclaration of gl_FragDepth "
3601 "must appear before any use of gl_FragDepth");
3604 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3605 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3606 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3607 _mesa_glsl_error(&loc
, state
,
3608 "gl_FragDepth: depth layout is declared here "
3609 "as '%s, but it was previously declared as "
3611 depth_layout_string(var
->data
.depth_layout
),
3612 depth_layout_string(earlier
->data
.depth_layout
));
3615 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3617 } else if (allow_all_redeclarations
) {
3618 if (earlier
->data
.mode
!= var
->data
.mode
) {
3619 _mesa_glsl_error(&loc
, state
,
3620 "redeclaration of `%s' with incorrect qualifiers",
3622 } else if (earlier
->type
!= var
->type
) {
3623 _mesa_glsl_error(&loc
, state
,
3624 "redeclaration of `%s' has incorrect type",
3628 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3635 * Generate the IR for an initializer in a variable declaration
3638 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3639 ast_fully_specified_type
*type
,
3640 exec_list
*initializer_instructions
,
3641 struct _mesa_glsl_parse_state
*state
)
3643 ir_rvalue
*result
= NULL
;
3645 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3647 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3649 * "All uniform variables are read-only and are initialized either
3650 * directly by an application via API commands, or indirectly by
3653 if (var
->data
.mode
== ir_var_uniform
) {
3654 state
->check_version(120, 0, &initializer_loc
,
3655 "cannot initialize uniform %s",
3659 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3661 * "Buffer variables cannot have initializers."
3663 if (var
->data
.mode
== ir_var_shader_storage
) {
3664 _mesa_glsl_error(&initializer_loc
, state
,
3665 "cannot initialize buffer variable %s",
3669 /* From section 4.1.7 of the GLSL 4.40 spec:
3671 * "Opaque variables [...] are initialized only through the
3672 * OpenGL API; they cannot be declared with an initializer in a
3675 if (var
->type
->contains_opaque()) {
3676 _mesa_glsl_error(&initializer_loc
, state
,
3677 "cannot initialize opaque variable %s",
3681 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3682 _mesa_glsl_error(&initializer_loc
, state
,
3683 "cannot initialize %s shader input / %s %s",
3684 _mesa_shader_stage_to_string(state
->stage
),
3685 (state
->stage
== MESA_SHADER_VERTEX
)
3686 ? "attribute" : "varying",
3690 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3691 _mesa_glsl_error(&initializer_loc
, state
,
3692 "cannot initialize %s shader output %s",
3693 _mesa_shader_stage_to_string(state
->stage
),
3697 /* If the initializer is an ast_aggregate_initializer, recursively store
3698 * type information from the LHS into it, so that its hir() function can do
3701 if (decl
->initializer
->oper
== ast_aggregate
)
3702 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3704 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3705 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3707 /* Calculate the constant value if this is a const or uniform
3710 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
3712 * "Declarations of globals without a storage qualifier, or with
3713 * just the const qualifier, may include initializers, in which case
3714 * they will be initialized before the first line of main() is
3715 * executed. Such initializers must be a constant expression."
3717 * The same section of the GLSL ES 3.00.4 spec has similar language.
3719 if (type
->qualifier
.flags
.q
.constant
3720 || type
->qualifier
.flags
.q
.uniform
3721 || (state
->es_shader
&& state
->current_function
== NULL
)) {
3722 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3724 if (new_rhs
!= NULL
) {
3727 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
3730 * "A constant expression is one of
3734 * - an expression formed by an operator on operands that are
3735 * all constant expressions, including getting an element of
3736 * a constant array, or a field of a constant structure, or
3737 * components of a constant vector. However, the sequence
3738 * operator ( , ) and the assignment operators ( =, +=, ...)
3739 * are not included in the operators that can create a
3740 * constant expression."
3742 * Section 12.43 (Sequence operator and constant expressions) says:
3744 * "Should the following construct be allowed?
3748 * The expression within the brackets uses the sequence operator
3749 * (',') and returns the integer 3 so the construct is declaring
3750 * a single-dimensional array of size 3. In some languages, the
3751 * construct declares a two-dimensional array. It would be
3752 * preferable to make this construct illegal to avoid confusion.
3754 * One possibility is to change the definition of the sequence
3755 * operator so that it does not return a constant-expression and
3756 * hence cannot be used to declare an array size.
3758 * RESOLUTION: The result of a sequence operator is not a
3759 * constant-expression."
3761 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
3762 * contains language almost identical to the section 4.3.3 in the
3763 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
3766 ir_constant
*constant_value
= rhs
->constant_expression_value();
3767 if (!constant_value
||
3768 (state
->is_version(430, 300) &&
3769 decl
->initializer
->has_sequence_subexpression())) {
3770 const char *const variable_mode
=
3771 (type
->qualifier
.flags
.q
.constant
)
3773 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
3775 /* If ARB_shading_language_420pack is enabled, initializers of
3776 * const-qualified local variables do not have to be constant
3777 * expressions. Const-qualified global variables must still be
3778 * initialized with constant expressions.
3780 if (!state
->has_420pack()
3781 || state
->current_function
== NULL
) {
3782 _mesa_glsl_error(& initializer_loc
, state
,
3783 "initializer of %s variable `%s' must be a "
3784 "constant expression",
3787 if (var
->type
->is_numeric()) {
3788 /* Reduce cascading errors. */
3789 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3790 ? ir_constant::zero(state
, var
->type
) : NULL
;
3794 rhs
= constant_value
;
3795 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3796 ? constant_value
: NULL
;
3799 if (var
->type
->is_numeric()) {
3800 /* Reduce cascading errors. */
3801 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3802 ? ir_constant::zero(state
, var
->type
) : NULL
;
3807 if (rhs
&& !rhs
->type
->is_error()) {
3808 bool temp
= var
->data
.read_only
;
3809 if (type
->qualifier
.flags
.q
.constant
)
3810 var
->data
.read_only
= false;
3812 /* Never emit code to initialize a uniform.
3814 const glsl_type
*initializer_type
;
3815 if (!type
->qualifier
.flags
.q
.uniform
) {
3816 do_assignment(initializer_instructions
, state
,
3821 type
->get_location());
3822 initializer_type
= result
->type
;
3824 initializer_type
= rhs
->type
;
3826 var
->constant_initializer
= rhs
->constant_expression_value();
3827 var
->data
.has_initializer
= true;
3829 /* If the declared variable is an unsized array, it must inherrit
3830 * its full type from the initializer. A declaration such as
3832 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3836 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3838 * The assignment generated in the if-statement (below) will also
3839 * automatically handle this case for non-uniforms.
3841 * If the declared variable is not an array, the types must
3842 * already match exactly. As a result, the type assignment
3843 * here can be done unconditionally. For non-uniforms the call
3844 * to do_assignment can change the type of the initializer (via
3845 * the implicit conversion rules). For uniforms the initializer
3846 * must be a constant expression, and the type of that expression
3847 * was validated above.
3849 var
->type
= initializer_type
;
3851 var
->data
.read_only
= temp
;
3858 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3859 YYLTYPE loc
, ir_variable
*var
,
3860 unsigned num_vertices
,
3862 const char *var_category
)
3864 if (var
->type
->is_unsized_array()) {
3865 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3867 * All geometry shader input unsized array declarations will be
3868 * sized by an earlier input layout qualifier, when present, as per
3869 * the following table.
3871 * Followed by a table mapping each allowed input layout qualifier to
3872 * the corresponding input length.
3874 * Similarly for tessellation control shader outputs.
3876 if (num_vertices
!= 0)
3877 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3880 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3881 * includes the following examples of compile-time errors:
3883 * // code sequence within one shader...
3884 * in vec4 Color1[]; // size unknown
3885 * ...Color1.length()...// illegal, length() unknown
3886 * in vec4 Color2[2]; // size is 2
3887 * ...Color1.length()...// illegal, Color1 still has no size
3888 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3889 * layout(lines) in; // legal, input size is 2, matching
3890 * in vec4 Color4[3]; // illegal, contradicts layout
3893 * To detect the case illustrated by Color3, we verify that the size of
3894 * an explicitly-sized array matches the size of any previously declared
3895 * explicitly-sized array. To detect the case illustrated by Color4, we
3896 * verify that the size of an explicitly-sized array is consistent with
3897 * any previously declared input layout.
3899 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3900 _mesa_glsl_error(&loc
, state
,
3901 "%s size contradicts previously declared layout "
3902 "(size is %u, but layout requires a size of %u)",
3903 var_category
, var
->type
->length
, num_vertices
);
3904 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3905 _mesa_glsl_error(&loc
, state
,
3906 "%s sizes are inconsistent (size is %u, but a "
3907 "previous declaration has size %u)",
3908 var_category
, var
->type
->length
, *size
);
3910 *size
= var
->type
->length
;
3916 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3917 YYLTYPE loc
, ir_variable
*var
)
3919 unsigned num_vertices
= 0;
3921 if (state
->tcs_output_vertices_specified
) {
3922 if (!state
->out_qualifier
->vertices
->
3923 process_qualifier_constant(state
, "vertices",
3924 &num_vertices
, false)) {
3928 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
3929 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
3930 "GL_MAX_PATCH_VERTICES", num_vertices
);
3935 if (!var
->type
->is_array() && !var
->data
.patch
) {
3936 _mesa_glsl_error(&loc
, state
,
3937 "tessellation control shader outputs must be arrays");
3939 /* To avoid cascading failures, short circuit the checks below. */
3943 if (var
->data
.patch
)
3946 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3947 &state
->tcs_output_size
,
3948 "tessellation control shader output");
3952 * Do additional processing necessary for tessellation control/evaluation shader
3953 * input declarations. This covers both interface block arrays and bare input
3957 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3958 YYLTYPE loc
, ir_variable
*var
)
3960 if (!var
->type
->is_array() && !var
->data
.patch
) {
3961 _mesa_glsl_error(&loc
, state
,
3962 "per-vertex tessellation shader inputs must be arrays");
3963 /* Avoid cascading failures. */
3967 if (var
->data
.patch
)
3970 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3971 if (var
->type
->is_unsized_array()) {
3972 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3973 state
->Const
.MaxPatchVertices
);
3979 * Do additional processing necessary for geometry shader input declarations
3980 * (this covers both interface blocks arrays and bare input variables).
3983 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3984 YYLTYPE loc
, ir_variable
*var
)
3986 unsigned num_vertices
= 0;
3988 if (state
->gs_input_prim_type_specified
) {
3989 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3992 /* Geometry shader input variables must be arrays. Caller should have
3993 * reported an error for this.
3995 if (!var
->type
->is_array()) {
3996 assert(state
->error
);
3998 /* To avoid cascading failures, short circuit the checks below. */
4002 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4003 &state
->gs_input_size
,
4004 "geometry shader input");
4008 validate_identifier(const char *identifier
, YYLTYPE loc
,
4009 struct _mesa_glsl_parse_state
*state
)
4011 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4013 * "Identifiers starting with "gl_" are reserved for use by
4014 * OpenGL, and may not be declared in a shader as either a
4015 * variable or a function."
4017 if (is_gl_identifier(identifier
)) {
4018 _mesa_glsl_error(&loc
, state
,
4019 "identifier `%s' uses reserved `gl_' prefix",
4021 } else if (strstr(identifier
, "__")) {
4022 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4025 * "In addition, all identifiers containing two
4026 * consecutive underscores (__) are reserved as
4027 * possible future keywords."
4029 * The intention is that names containing __ are reserved for internal
4030 * use by the implementation, and names prefixed with GL_ are reserved
4031 * for use by Khronos. Names simply containing __ are dangerous to use,
4032 * but should be allowed.
4034 * A future version of the GLSL specification will clarify this.
4036 _mesa_glsl_warning(&loc
, state
,
4037 "identifier `%s' uses reserved `__' string",
4043 ast_declarator_list::hir(exec_list
*instructions
,
4044 struct _mesa_glsl_parse_state
*state
)
4047 const struct glsl_type
*decl_type
;
4048 const char *type_name
= NULL
;
4049 ir_rvalue
*result
= NULL
;
4050 YYLTYPE loc
= this->get_location();
4052 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4054 * "To ensure that a particular output variable is invariant, it is
4055 * necessary to use the invariant qualifier. It can either be used to
4056 * qualify a previously declared variable as being invariant
4058 * invariant gl_Position; // make existing gl_Position be invariant"
4060 * In these cases the parser will set the 'invariant' flag in the declarator
4061 * list, and the type will be NULL.
4063 if (this->invariant
) {
4064 assert(this->type
== NULL
);
4066 if (state
->current_function
!= NULL
) {
4067 _mesa_glsl_error(& loc
, state
,
4068 "all uses of `invariant' keyword must be at global "
4072 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4073 assert(decl
->array_specifier
== NULL
);
4074 assert(decl
->initializer
== NULL
);
4076 ir_variable
*const earlier
=
4077 state
->symbols
->get_variable(decl
->identifier
);
4078 if (earlier
== NULL
) {
4079 _mesa_glsl_error(& loc
, state
,
4080 "undeclared variable `%s' cannot be marked "
4081 "invariant", decl
->identifier
);
4082 } else if (!is_varying_var(earlier
, state
->stage
)) {
4083 _mesa_glsl_error(&loc
, state
,
4084 "`%s' cannot be marked invariant; interfaces between "
4085 "shader stages only.", decl
->identifier
);
4086 } else if (earlier
->data
.used
) {
4087 _mesa_glsl_error(& loc
, state
,
4088 "variable `%s' may not be redeclared "
4089 "`invariant' after being used",
4092 earlier
->data
.invariant
= true;
4096 /* Invariant redeclarations do not have r-values.
4101 if (this->precise
) {
4102 assert(this->type
== NULL
);
4104 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4105 assert(decl
->array_specifier
== NULL
);
4106 assert(decl
->initializer
== NULL
);
4108 ir_variable
*const earlier
=
4109 state
->symbols
->get_variable(decl
->identifier
);
4110 if (earlier
== NULL
) {
4111 _mesa_glsl_error(& loc
, state
,
4112 "undeclared variable `%s' cannot be marked "
4113 "precise", decl
->identifier
);
4114 } else if (state
->current_function
!= NULL
&&
4115 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4116 /* Note: we have to check if we're in a function, since
4117 * builtins are treated as having come from another scope.
4119 _mesa_glsl_error(& loc
, state
,
4120 "variable `%s' from an outer scope may not be "
4121 "redeclared `precise' in this scope",
4123 } else if (earlier
->data
.used
) {
4124 _mesa_glsl_error(& loc
, state
,
4125 "variable `%s' may not be redeclared "
4126 "`precise' after being used",
4129 earlier
->data
.precise
= true;
4133 /* Precise redeclarations do not have r-values either. */
4137 assert(this->type
!= NULL
);
4138 assert(!this->invariant
);
4139 assert(!this->precise
);
4141 /* The type specifier may contain a structure definition. Process that
4142 * before any of the variable declarations.
4144 (void) this->type
->specifier
->hir(instructions
, state
);
4146 decl_type
= this->type
->glsl_type(& type_name
, state
);
4148 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4149 * "Buffer variables may only be declared inside interface blocks
4150 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4151 * shader storage blocks. It is a compile-time error to declare buffer
4152 * variables at global scope (outside a block)."
4154 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4155 _mesa_glsl_error(&loc
, state
,
4156 "buffer variables cannot be declared outside "
4157 "interface blocks");
4160 /* An offset-qualified atomic counter declaration sets the default
4161 * offset for the next declaration within the same atomic counter
4164 if (decl_type
&& decl_type
->contains_atomic()) {
4165 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4166 type
->qualifier
.flags
.q
.explicit_offset
) {
4167 unsigned qual_binding
;
4168 unsigned qual_offset
;
4169 if (process_qualifier_constant(state
, &loc
, "binding",
4170 type
->qualifier
.binding
,
4172 && process_qualifier_constant(state
, &loc
, "offset",
4173 type
->qualifier
.offset
,
4175 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4180 if (this->declarations
.is_empty()) {
4181 /* If there is no structure involved in the program text, there are two
4182 * possible scenarios:
4184 * - The program text contained something like 'vec4;'. This is an
4185 * empty declaration. It is valid but weird. Emit a warning.
4187 * - The program text contained something like 'S;' and 'S' is not the
4188 * name of a known structure type. This is both invalid and weird.
4191 * - The program text contained something like 'mediump float;'
4192 * when the programmer probably meant 'precision mediump
4193 * float;' Emit a warning with a description of what they
4194 * probably meant to do.
4196 * Note that if decl_type is NULL and there is a structure involved,
4197 * there must have been some sort of error with the structure. In this
4198 * case we assume that an error was already generated on this line of
4199 * code for the structure. There is no need to generate an additional,
4202 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4205 if (decl_type
== NULL
) {
4206 _mesa_glsl_error(&loc
, state
,
4207 "invalid type `%s' in empty declaration",
4209 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4210 /* Empty atomic counter declarations are allowed and useful
4211 * to set the default offset qualifier.
4214 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4215 if (this->type
->specifier
->structure
!= NULL
) {
4216 _mesa_glsl_error(&loc
, state
,
4217 "precision qualifiers can't be applied "
4220 static const char *const precision_names
[] = {
4227 _mesa_glsl_warning(&loc
, state
,
4228 "empty declaration with precision qualifier, "
4229 "to set the default precision, use "
4230 "`precision %s %s;'",
4231 precision_names
[this->type
->qualifier
.precision
],
4234 } else if (this->type
->specifier
->structure
== NULL
) {
4235 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4239 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4240 const struct glsl_type
*var_type
;
4242 const char *identifier
= decl
->identifier
;
4243 /* FINISHME: Emit a warning if a variable declaration shadows a
4244 * FINISHME: declaration at a higher scope.
4247 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4248 if (type_name
!= NULL
) {
4249 _mesa_glsl_error(& loc
, state
,
4250 "invalid type `%s' in declaration of `%s'",
4251 type_name
, decl
->identifier
);
4253 _mesa_glsl_error(& loc
, state
,
4254 "invalid type in declaration of `%s'",
4260 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4264 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4266 _mesa_glsl_error(& loc
, state
,
4267 "invalid type in declaration of `%s'",
4269 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4274 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4277 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4279 /* The 'varying in' and 'varying out' qualifiers can only be used with
4280 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4283 if (this->type
->qualifier
.flags
.q
.varying
) {
4284 if (this->type
->qualifier
.flags
.q
.in
) {
4285 _mesa_glsl_error(& loc
, state
,
4286 "`varying in' qualifier in declaration of "
4287 "`%s' only valid for geometry shaders using "
4288 "ARB_geometry_shader4 or EXT_geometry_shader4",
4290 } else if (this->type
->qualifier
.flags
.q
.out
) {
4291 _mesa_glsl_error(& loc
, state
,
4292 "`varying out' qualifier in declaration of "
4293 "`%s' only valid for geometry shaders using "
4294 "ARB_geometry_shader4 or EXT_geometry_shader4",
4299 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4301 * "Global variables can only use the qualifiers const,
4302 * attribute, uniform, or varying. Only one may be
4305 * Local variables can only use the qualifier const."
4307 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4308 * any extension that adds the 'layout' keyword.
4310 if (!state
->is_version(130, 300)
4311 && !state
->has_explicit_attrib_location()
4312 && !state
->has_separate_shader_objects()
4313 && !state
->ARB_fragment_coord_conventions_enable
) {
4314 if (this->type
->qualifier
.flags
.q
.out
) {
4315 _mesa_glsl_error(& loc
, state
,
4316 "`out' qualifier in declaration of `%s' "
4317 "only valid for function parameters in %s",
4318 decl
->identifier
, state
->get_version_string());
4320 if (this->type
->qualifier
.flags
.q
.in
) {
4321 _mesa_glsl_error(& loc
, state
,
4322 "`in' qualifier in declaration of `%s' "
4323 "only valid for function parameters in %s",
4324 decl
->identifier
, state
->get_version_string());
4326 /* FINISHME: Test for other invalid qualifiers. */
4329 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4331 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4334 if (this->type
->qualifier
.flags
.q
.invariant
) {
4335 if (!is_varying_var(var
, state
->stage
)) {
4336 _mesa_glsl_error(&loc
, state
,
4337 "`%s' cannot be marked invariant; interfaces between "
4338 "shader stages only", var
->name
);
4342 if (state
->current_function
!= NULL
) {
4343 const char *mode
= NULL
;
4344 const char *extra
= "";
4346 /* There is no need to check for 'inout' here because the parser will
4347 * only allow that in function parameter lists.
4349 if (this->type
->qualifier
.flags
.q
.attribute
) {
4351 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4352 mode
= "subroutine uniform";
4353 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4355 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4357 } else if (this->type
->qualifier
.flags
.q
.in
) {
4359 extra
= " or in function parameter list";
4360 } else if (this->type
->qualifier
.flags
.q
.out
) {
4362 extra
= " or in function parameter list";
4366 _mesa_glsl_error(& loc
, state
,
4367 "%s variable `%s' must be declared at "
4369 mode
, var
->name
, extra
);
4371 } else if (var
->data
.mode
== ir_var_shader_in
) {
4372 var
->data
.read_only
= true;
4374 if (state
->stage
== MESA_SHADER_VERTEX
) {
4375 bool error_emitted
= false;
4377 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4379 * "Vertex shader inputs can only be float, floating-point
4380 * vectors, matrices, signed and unsigned integers and integer
4381 * vectors. Vertex shader inputs can also form arrays of these
4382 * types, but not structures."
4384 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4386 * "Vertex shader inputs can only be float, floating-point
4387 * vectors, matrices, signed and unsigned integers and integer
4388 * vectors. They cannot be arrays or structures."
4390 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4392 * "The attribute qualifier can be used only with float,
4393 * floating-point vectors, and matrices. Attribute variables
4394 * cannot be declared as arrays or structures."
4396 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4398 * "Vertex shader inputs can only be float, floating-point
4399 * vectors, matrices, signed and unsigned integers and integer
4400 * vectors. Vertex shader inputs cannot be arrays or
4403 const glsl_type
*check_type
= var
->type
->without_array();
4405 switch (check_type
->base_type
) {
4406 case GLSL_TYPE_FLOAT
:
4408 case GLSL_TYPE_UINT
:
4410 if (state
->is_version(120, 300))
4412 case GLSL_TYPE_DOUBLE
:
4413 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4417 _mesa_glsl_error(& loc
, state
,
4418 "vertex shader input / attribute cannot have "
4420 var
->type
->is_array() ? "array of " : "",
4422 error_emitted
= true;
4425 if (!error_emitted
&& var
->type
->is_array() &&
4426 !state
->check_version(150, 0, &loc
,
4427 "vertex shader input / attribute "
4428 "cannot have array type")) {
4429 error_emitted
= true;
4431 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4432 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4434 * Geometry shader input variables get the per-vertex values
4435 * written out by vertex shader output variables of the same
4436 * names. Since a geometry shader operates on a set of
4437 * vertices, each input varying variable (or input block, see
4438 * interface blocks below) needs to be declared as an array.
4440 if (!var
->type
->is_array()) {
4441 _mesa_glsl_error(&loc
, state
,
4442 "geometry shader inputs must be arrays");
4445 handle_geometry_shader_input_decl(state
, loc
, var
);
4446 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4447 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4449 * It is a compile-time error to declare a fragment shader
4450 * input with, or that contains, any of the following types:
4454 * * An array of arrays
4455 * * An array of structures
4456 * * A structure containing an array
4457 * * A structure containing a structure
4459 if (state
->es_shader
) {
4460 const glsl_type
*check_type
= var
->type
->without_array();
4461 if (check_type
->is_boolean() ||
4462 check_type
->contains_opaque()) {
4463 _mesa_glsl_error(&loc
, state
,
4464 "fragment shader input cannot have type %s",
4467 if (var
->type
->is_array() &&
4468 var
->type
->fields
.array
->is_array()) {
4469 _mesa_glsl_error(&loc
, state
,
4471 "cannot have an array of arrays",
4472 _mesa_shader_stage_to_string(state
->stage
));
4474 if (var
->type
->is_array() &&
4475 var
->type
->fields
.array
->is_record()) {
4476 _mesa_glsl_error(&loc
, state
,
4477 "fragment shader input "
4478 "cannot have an array of structs");
4480 if (var
->type
->is_record()) {
4481 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4482 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4483 var
->type
->fields
.structure
[i
].type
->is_record())
4484 _mesa_glsl_error(&loc
, state
,
4485 "fragement shader input cannot have "
4486 "a struct that contains an "
4491 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4492 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4493 handle_tess_shader_input_decl(state
, loc
, var
);
4495 } else if (var
->data
.mode
== ir_var_shader_out
) {
4496 const glsl_type
*check_type
= var
->type
->without_array();
4498 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4500 * It is a compile-time error to declare a vertex, tessellation
4501 * evaluation, tessellation control, or geometry shader output
4502 * that contains any of the following:
4504 * * A Boolean type (bool, bvec2 ...)
4507 if (check_type
->is_boolean() || check_type
->contains_opaque())
4508 _mesa_glsl_error(&loc
, state
,
4509 "%s shader output cannot have type %s",
4510 _mesa_shader_stage_to_string(state
->stage
),
4513 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4515 * It is a compile-time error to declare a fragment shader output
4516 * that contains any of the following:
4518 * * A Boolean type (bool, bvec2 ...)
4519 * * A double-precision scalar or vector (double, dvec2 ...)
4524 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4525 if (check_type
->is_record() || check_type
->is_matrix())
4526 _mesa_glsl_error(&loc
, state
,
4527 "fragment shader output "
4528 "cannot have struct or matrix type");
4529 switch (check_type
->base_type
) {
4530 case GLSL_TYPE_UINT
:
4532 case GLSL_TYPE_FLOAT
:
4535 _mesa_glsl_error(&loc
, state
,
4536 "fragment shader output cannot have "
4537 "type %s", check_type
->name
);
4541 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4543 * It is a compile-time error to declare a vertex shader output
4544 * with, or that contains, any of the following types:
4548 * * An array of arrays
4549 * * An array of structures
4550 * * A structure containing an array
4551 * * A structure containing a structure
4553 * It is a compile-time error to declare a fragment shader output
4554 * with, or that contains, any of the following types:
4560 * * An array of array
4562 if (state
->es_shader
) {
4563 if (var
->type
->is_array() &&
4564 var
->type
->fields
.array
->is_array()) {
4565 _mesa_glsl_error(&loc
, state
,
4567 "cannot have an array of arrays",
4568 _mesa_shader_stage_to_string(state
->stage
));
4570 if (state
->stage
== MESA_SHADER_VERTEX
) {
4571 if (var
->type
->is_array() &&
4572 var
->type
->fields
.array
->is_record()) {
4573 _mesa_glsl_error(&loc
, state
,
4574 "vertex shader output "
4575 "cannot have an array of structs");
4577 if (var
->type
->is_record()) {
4578 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4579 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4580 var
->type
->fields
.structure
[i
].type
->is_record())
4581 _mesa_glsl_error(&loc
, state
,
4582 "vertex shader output cannot have a "
4583 "struct that contains an "
4590 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4591 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4593 } else if (var
->type
->contains_subroutine()) {
4594 /* declare subroutine uniforms as hidden */
4595 var
->data
.how_declared
= ir_var_hidden
;
4598 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4599 * so must integer vertex outputs.
4601 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4602 * "Fragment shader inputs that are signed or unsigned integers or
4603 * integer vectors must be qualified with the interpolation qualifier
4606 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4607 * "Fragment shader inputs that are, or contain, signed or unsigned
4608 * integers or integer vectors must be qualified with the
4609 * interpolation qualifier flat."
4611 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4612 * "Vertex shader outputs that are, or contain, signed or unsigned
4613 * integers or integer vectors must be qualified with the
4614 * interpolation qualifier flat."
4616 * Note that prior to GLSL 1.50, this requirement applied to vertex
4617 * outputs rather than fragment inputs. That creates problems in the
4618 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4619 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4620 * apply the restriction to both vertex outputs and fragment inputs.
4622 * Note also that the desktop GLSL specs are missing the text "or
4623 * contain"; this is presumably an oversight, since there is no
4624 * reasonable way to interpolate a fragment shader input that contains
4627 if (state
->is_version(130, 300) &&
4628 var
->type
->contains_integer() &&
4629 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4630 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4631 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4632 && state
->es_shader
))) {
4633 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4634 "vertex output" : "fragment input";
4635 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4636 "an integer, then it must be qualified with 'flat'",
4640 /* Double fragment inputs must be qualified with 'flat'. */
4641 if (var
->type
->contains_double() &&
4642 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4643 state
->stage
== MESA_SHADER_FRAGMENT
&&
4644 var
->data
.mode
== ir_var_shader_in
) {
4645 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4646 "a double, then it must be qualified with 'flat'",
4650 /* Interpolation qualifiers cannot be applied to 'centroid' and
4651 * 'centroid varying'.
4653 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4654 * "interpolation qualifiers may only precede the qualifiers in,
4655 * centroid in, out, or centroid out in a declaration. They do not apply
4656 * to the deprecated storage qualifiers varying or centroid varying."
4658 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4660 if (state
->is_version(130, 0)
4661 && this->type
->qualifier
.has_interpolation()
4662 && this->type
->qualifier
.flags
.q
.varying
) {
4664 const char *i
= this->type
->qualifier
.interpolation_string();
4667 if (this->type
->qualifier
.flags
.q
.centroid
)
4668 s
= "centroid varying";
4672 _mesa_glsl_error(&loc
, state
,
4673 "qualifier '%s' cannot be applied to the "
4674 "deprecated storage qualifier '%s'", i
, s
);
4678 /* Interpolation qualifiers can only apply to vertex shader outputs and
4679 * fragment shader inputs.
4681 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4682 * "Outputs from a vertex shader (out) and inputs to a fragment
4683 * shader (in) can be further qualified with one or more of these
4684 * interpolation qualifiers"
4686 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4687 * "These interpolation qualifiers may only precede the qualifiers
4688 * in, centroid in, out, or centroid out in a declaration. They do
4689 * not apply to inputs into a vertex shader or outputs from a
4692 if (state
->is_version(130, 300)
4693 && this->type
->qualifier
.has_interpolation()) {
4695 const char *i
= this->type
->qualifier
.interpolation_string();
4698 switch (state
->stage
) {
4699 case MESA_SHADER_VERTEX
:
4700 if (this->type
->qualifier
.flags
.q
.in
) {
4701 _mesa_glsl_error(&loc
, state
,
4702 "qualifier '%s' cannot be applied to vertex "
4703 "shader inputs", i
);
4706 case MESA_SHADER_FRAGMENT
:
4707 if (this->type
->qualifier
.flags
.q
.out
) {
4708 _mesa_glsl_error(&loc
, state
,
4709 "qualifier '%s' cannot be applied to fragment "
4710 "shader outputs", i
);
4719 /* From section 4.3.4 of the GLSL 4.00 spec:
4720 * "Input variables may not be declared using the patch in qualifier
4721 * in tessellation control or geometry shaders."
4723 * From section 4.3.6 of the GLSL 4.00 spec:
4724 * "It is an error to use patch out in a vertex, tessellation
4725 * evaluation, or geometry shader."
4727 * This doesn't explicitly forbid using them in a fragment shader, but
4728 * that's probably just an oversight.
4730 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4731 && this->type
->qualifier
.flags
.q
.patch
4732 && this->type
->qualifier
.flags
.q
.in
) {
4734 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4735 "tessellation evaluation shader");
4738 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4739 && this->type
->qualifier
.flags
.q
.patch
4740 && this->type
->qualifier
.flags
.q
.out
) {
4742 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4743 "tessellation control shader");
4746 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4748 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4749 state
->check_precision_qualifiers_allowed(&loc
);
4753 /* If a precision qualifier is allowed on a type, it is allowed on
4754 * an array of that type.
4756 if (!(this->type
->qualifier
.precision
== ast_precision_none
4757 || precision_qualifier_allowed(var
->type
->without_array()))) {
4759 _mesa_glsl_error(&loc
, state
,
4760 "precision qualifiers apply only to floating point"
4761 ", integer and opaque types");
4764 /* From section 4.1.7 of the GLSL 4.40 spec:
4766 * "[Opaque types] can only be declared as function
4767 * parameters or uniform-qualified variables."
4769 if (var_type
->contains_opaque() &&
4770 !this->type
->qualifier
.flags
.q
.uniform
) {
4771 _mesa_glsl_error(&loc
, state
,
4772 "opaque variables must be declared uniform");
4775 /* Process the initializer and add its instructions to a temporary
4776 * list. This list will be added to the instruction stream (below) after
4777 * the declaration is added. This is done because in some cases (such as
4778 * redeclarations) the declaration may not actually be added to the
4779 * instruction stream.
4781 exec_list initializer_instructions
;
4783 /* Examine var name here since var may get deleted in the next call */
4784 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4786 ir_variable
*earlier
=
4787 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4788 false /* allow_all_redeclarations */);
4789 if (earlier
!= NULL
) {
4791 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4792 _mesa_glsl_error(&loc
, state
,
4793 "`%s' has already been redeclared using "
4794 "gl_PerVertex", earlier
->name
);
4796 earlier
->data
.how_declared
= ir_var_declared_normally
;
4799 if (decl
->initializer
!= NULL
) {
4800 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4802 &initializer_instructions
, state
);
4804 validate_array_dimensions(var_type
, state
, &loc
);
4807 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4809 * "It is an error to write to a const variable outside of
4810 * its declaration, so they must be initialized when
4813 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4814 _mesa_glsl_error(& loc
, state
,
4815 "const declaration of `%s' must be initialized",
4819 if (state
->es_shader
) {
4820 const glsl_type
*const t
= (earlier
== NULL
)
4821 ? var
->type
: earlier
->type
;
4823 if (t
->is_unsized_array())
4824 /* Section 10.17 of the GLSL ES 1.00 specification states that
4825 * unsized array declarations have been removed from the language.
4826 * Arrays that are sized using an initializer are still explicitly
4827 * sized. However, GLSL ES 1.00 does not allow array
4828 * initializers. That is only allowed in GLSL ES 3.00.
4830 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4832 * "An array type can also be formed without specifying a size
4833 * if the definition includes an initializer:
4835 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4836 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4841 _mesa_glsl_error(& loc
, state
,
4842 "unsized array declarations are not allowed in "
4846 /* If the declaration is not a redeclaration, there are a few additional
4847 * semantic checks that must be applied. In addition, variable that was
4848 * created for the declaration should be added to the IR stream.
4850 if (earlier
== NULL
) {
4851 validate_identifier(decl
->identifier
, loc
, state
);
4853 /* Add the variable to the symbol table. Note that the initializer's
4854 * IR was already processed earlier (though it hasn't been emitted
4855 * yet), without the variable in scope.
4857 * This differs from most C-like languages, but it follows the GLSL
4858 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4861 * "Within a declaration, the scope of a name starts immediately
4862 * after the initializer if present or immediately after the name
4863 * being declared if not."
4865 if (!state
->symbols
->add_variable(var
)) {
4866 YYLTYPE loc
= this->get_location();
4867 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4868 "current scope", decl
->identifier
);
4872 /* Push the variable declaration to the top. It means that all the
4873 * variable declarations will appear in a funny last-to-first order,
4874 * but otherwise we run into trouble if a function is prototyped, a
4875 * global var is decled, then the function is defined with usage of
4876 * the global var. See glslparsertest's CorrectModule.frag.
4878 instructions
->push_head(var
);
4881 instructions
->append_list(&initializer_instructions
);
4885 /* Generally, variable declarations do not have r-values. However,
4886 * one is used for the declaration in
4888 * while (bool b = some_condition()) {
4892 * so we return the rvalue from the last seen declaration here.
4899 ast_parameter_declarator::hir(exec_list
*instructions
,
4900 struct _mesa_glsl_parse_state
*state
)
4903 const struct glsl_type
*type
;
4904 const char *name
= NULL
;
4905 YYLTYPE loc
= this->get_location();
4907 type
= this->type
->glsl_type(& name
, state
);
4911 _mesa_glsl_error(& loc
, state
,
4912 "invalid type `%s' in declaration of `%s'",
4913 name
, this->identifier
);
4915 _mesa_glsl_error(& loc
, state
,
4916 "invalid type in declaration of `%s'",
4920 type
= glsl_type::error_type
;
4923 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4925 * "Functions that accept no input arguments need not use void in the
4926 * argument list because prototypes (or definitions) are required and
4927 * therefore there is no ambiguity when an empty argument list "( )" is
4928 * declared. The idiom "(void)" as a parameter list is provided for
4931 * Placing this check here prevents a void parameter being set up
4932 * for a function, which avoids tripping up checks for main taking
4933 * parameters and lookups of an unnamed symbol.
4935 if (type
->is_void()) {
4936 if (this->identifier
!= NULL
)
4937 _mesa_glsl_error(& loc
, state
,
4938 "named parameter cannot have type `void'");
4944 if (formal_parameter
&& (this->identifier
== NULL
)) {
4945 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4949 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4950 * call already handled the "vec4[..] foo" case.
4952 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4954 if (!type
->is_error() && type
->is_unsized_array()) {
4955 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4957 type
= glsl_type::error_type
;
4961 ir_variable
*var
= new(ctx
)
4962 ir_variable(type
, this->identifier
, ir_var_function_in
);
4964 /* Apply any specified qualifiers to the parameter declaration. Note that
4965 * for function parameters the default mode is 'in'.
4967 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
4970 /* From section 4.1.7 of the GLSL 4.40 spec:
4972 * "Opaque variables cannot be treated as l-values; hence cannot
4973 * be used as out or inout function parameters, nor can they be
4976 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4977 && type
->contains_opaque()) {
4978 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
4979 "contain opaque variables");
4980 type
= glsl_type::error_type
;
4983 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
4985 * "When calling a function, expressions that do not evaluate to
4986 * l-values cannot be passed to parameters declared as out or inout."
4988 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
4990 * "Other binary or unary expressions, non-dereferenced arrays,
4991 * function names, swizzles with repeated fields, and constants
4992 * cannot be l-values."
4994 * So for GLSL 1.10, passing an array as an out or inout parameter is not
4995 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
4997 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4999 && !state
->check_version(120, 100, &loc
,
5000 "arrays cannot be out or inout parameters")) {
5001 type
= glsl_type::error_type
;
5004 instructions
->push_tail(var
);
5006 /* Parameter declarations do not have r-values.
5013 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5015 exec_list
*ir_parameters
,
5016 _mesa_glsl_parse_state
*state
)
5018 ast_parameter_declarator
*void_param
= NULL
;
5021 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5022 param
->formal_parameter
= formal
;
5023 param
->hir(ir_parameters
, state
);
5031 if ((void_param
!= NULL
) && (count
> 1)) {
5032 YYLTYPE loc
= void_param
->get_location();
5034 _mesa_glsl_error(& loc
, state
,
5035 "`void' parameter must be only parameter");
5041 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5043 /* IR invariants disallow function declarations or definitions
5044 * nested within other function definitions. But there is no
5045 * requirement about the relative order of function declarations
5046 * and definitions with respect to one another. So simply insert
5047 * the new ir_function block at the end of the toplevel instruction
5050 state
->toplevel_ir
->push_tail(f
);
5055 ast_function::hir(exec_list
*instructions
,
5056 struct _mesa_glsl_parse_state
*state
)
5059 ir_function
*f
= NULL
;
5060 ir_function_signature
*sig
= NULL
;
5061 exec_list hir_parameters
;
5062 YYLTYPE loc
= this->get_location();
5064 const char *const name
= identifier
;
5066 /* New functions are always added to the top-level IR instruction stream,
5067 * so this instruction list pointer is ignored. See also emit_function
5070 (void) instructions
;
5072 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5074 * "Function declarations (prototypes) cannot occur inside of functions;
5075 * they must be at global scope, or for the built-in functions, outside
5076 * the global scope."
5078 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5080 * "User defined functions may only be defined within the global scope."
5082 * Note that this language does not appear in GLSL 1.10.
5084 if ((state
->current_function
!= NULL
) &&
5085 state
->is_version(120, 100)) {
5086 YYLTYPE loc
= this->get_location();
5087 _mesa_glsl_error(&loc
, state
,
5088 "declaration of function `%s' not allowed within "
5089 "function body", name
);
5092 validate_identifier(name
, this->get_location(), state
);
5094 /* Convert the list of function parameters to HIR now so that they can be
5095 * used below to compare this function's signature with previously seen
5096 * signatures for functions with the same name.
5098 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5100 & hir_parameters
, state
);
5102 const char *return_type_name
;
5103 const glsl_type
*return_type
=
5104 this->return_type
->glsl_type(& return_type_name
, state
);
5107 YYLTYPE loc
= this->get_location();
5108 _mesa_glsl_error(&loc
, state
,
5109 "function `%s' has undeclared return type `%s'",
5110 name
, return_type_name
);
5111 return_type
= glsl_type::error_type
;
5114 /* ARB_shader_subroutine states:
5115 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5116 * subroutine(...) to a function declaration."
5118 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5119 YYLTYPE loc
= this->get_location();
5120 _mesa_glsl_error(&loc
, state
,
5121 "function declaration `%s' cannot have subroutine prepended",
5125 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5126 * "No qualifier is allowed on the return type of a function."
5128 if (this->return_type
->has_qualifiers(state
)) {
5129 YYLTYPE loc
= this->get_location();
5130 _mesa_glsl_error(& loc
, state
,
5131 "function `%s' return type has qualifiers", name
);
5134 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5136 * "Arrays are allowed as arguments and as the return type. In both
5137 * cases, the array must be explicitly sized."
5139 if (return_type
->is_unsized_array()) {
5140 YYLTYPE loc
= this->get_location();
5141 _mesa_glsl_error(& loc
, state
,
5142 "function `%s' return type array must be explicitly "
5146 /* From section 4.1.7 of the GLSL 4.40 spec:
5148 * "[Opaque types] can only be declared as function parameters
5149 * or uniform-qualified variables."
5151 if (return_type
->contains_opaque()) {
5152 YYLTYPE loc
= this->get_location();
5153 _mesa_glsl_error(&loc
, state
,
5154 "function `%s' return type can't contain an opaque type",
5158 /* Create an ir_function if one doesn't already exist. */
5159 f
= state
->symbols
->get_function(name
);
5161 f
= new(ctx
) ir_function(name
);
5162 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5163 if (!state
->symbols
->add_function(f
)) {
5164 /* This function name shadows a non-function use of the same name. */
5165 YYLTYPE loc
= this->get_location();
5166 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5167 "non-function", name
);
5171 emit_function(state
, f
);
5174 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5176 * "A shader cannot redefine or overload built-in functions."
5178 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5180 * "User code can overload the built-in functions but cannot redefine
5183 if (state
->es_shader
&& state
->language_version
>= 300) {
5184 /* Local shader has no exact candidates; check the built-ins. */
5185 _mesa_glsl_initialize_builtin_functions();
5186 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5187 YYLTYPE loc
= this->get_location();
5188 _mesa_glsl_error(& loc
, state
,
5189 "A shader cannot redefine or overload built-in "
5190 "function `%s' in GLSL ES 3.00", name
);
5195 /* Verify that this function's signature either doesn't match a previously
5196 * seen signature for a function with the same name, or, if a match is found,
5197 * that the previously seen signature does not have an associated definition.
5199 if (state
->es_shader
|| f
->has_user_signature()) {
5200 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5202 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5203 if (badvar
!= NULL
) {
5204 YYLTYPE loc
= this->get_location();
5206 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5207 "qualifiers don't match prototype", name
, badvar
);
5210 if (sig
->return_type
!= return_type
) {
5211 YYLTYPE loc
= this->get_location();
5213 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5214 "match prototype", name
);
5217 if (sig
->is_defined
) {
5218 if (is_definition
) {
5219 YYLTYPE loc
= this->get_location();
5220 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5222 /* We just encountered a prototype that exactly matches a
5223 * function that's already been defined. This is redundant,
5224 * and we should ignore it.
5232 /* Verify the return type of main() */
5233 if (strcmp(name
, "main") == 0) {
5234 if (! return_type
->is_void()) {
5235 YYLTYPE loc
= this->get_location();
5237 _mesa_glsl_error(& loc
, state
, "main() must return void");
5240 if (!hir_parameters
.is_empty()) {
5241 YYLTYPE loc
= this->get_location();
5243 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5247 /* Finish storing the information about this new function in its signature.
5250 sig
= new(ctx
) ir_function_signature(return_type
);
5251 f
->add_signature(sig
);
5254 sig
->replace_parameters(&hir_parameters
);
5257 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5260 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5261 unsigned qual_index
;
5262 if (process_qualifier_constant(state
, &loc
, "index",
5263 this->return_type
->qualifier
.index
,
5265 if (!state
->has_explicit_uniform_location()) {
5266 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5267 "GL_ARB_explicit_uniform_location or "
5269 } else if (qual_index
>= MAX_SUBROUTINES
) {
5270 _mesa_glsl_error(&loc
, state
,
5271 "invalid subroutine index (%d) index must "
5272 "be a number between 0 and "
5273 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5274 MAX_SUBROUTINES
- 1);
5276 f
->subroutine_index
= qual_index
;
5281 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5282 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5283 f
->num_subroutine_types
);
5285 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5286 const struct glsl_type
*type
;
5287 /* the subroutine type must be already declared */
5288 type
= state
->symbols
->get_type(decl
->identifier
);
5290 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5292 f
->subroutine_types
[idx
++] = type
;
5294 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5296 state
->num_subroutines
+ 1);
5297 state
->subroutines
[state
->num_subroutines
] = f
;
5298 state
->num_subroutines
++;
5302 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5303 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5304 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5307 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5309 state
->num_subroutine_types
+ 1);
5310 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5311 state
->num_subroutine_types
++;
5313 f
->is_subroutine
= true;
5316 /* Function declarations (prototypes) do not have r-values.
5323 ast_function_definition::hir(exec_list
*instructions
,
5324 struct _mesa_glsl_parse_state
*state
)
5326 prototype
->is_definition
= true;
5327 prototype
->hir(instructions
, state
);
5329 ir_function_signature
*signature
= prototype
->signature
;
5330 if (signature
== NULL
)
5333 assert(state
->current_function
== NULL
);
5334 state
->current_function
= signature
;
5335 state
->found_return
= false;
5337 /* Duplicate parameters declared in the prototype as concrete variables.
5338 * Add these to the symbol table.
5340 state
->symbols
->push_scope();
5341 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5342 assert(var
->as_variable() != NULL
);
5344 /* The only way a parameter would "exist" is if two parameters have
5347 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5348 YYLTYPE loc
= this->get_location();
5350 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5352 state
->symbols
->add_variable(var
);
5356 /* Convert the body of the function to HIR. */
5357 this->body
->hir(&signature
->body
, state
);
5358 signature
->is_defined
= true;
5360 state
->symbols
->pop_scope();
5362 assert(state
->current_function
== signature
);
5363 state
->current_function
= NULL
;
5365 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5366 YYLTYPE loc
= this->get_location();
5367 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5368 "%s, but no return statement",
5369 signature
->function_name(),
5370 signature
->return_type
->name
);
5373 /* Function definitions do not have r-values.
5380 ast_jump_statement::hir(exec_list
*instructions
,
5381 struct _mesa_glsl_parse_state
*state
)
5388 assert(state
->current_function
);
5390 if (opt_return_value
) {
5391 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5393 /* The value of the return type can be NULL if the shader says
5394 * 'return foo();' and foo() is a function that returns void.
5396 * NOTE: The GLSL spec doesn't say that this is an error. The type
5397 * of the return value is void. If the return type of the function is
5398 * also void, then this should compile without error. Seriously.
5400 const glsl_type
*const ret_type
=
5401 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5403 /* Implicit conversions are not allowed for return values prior to
5404 * ARB_shading_language_420pack.
5406 if (state
->current_function
->return_type
!= ret_type
) {
5407 YYLTYPE loc
= this->get_location();
5409 if (state
->has_420pack()) {
5410 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5412 _mesa_glsl_error(& loc
, state
,
5413 "could not implicitly convert return value "
5414 "to %s, in function `%s'",
5415 state
->current_function
->return_type
->name
,
5416 state
->current_function
->function_name());
5419 _mesa_glsl_error(& loc
, state
,
5420 "`return' with wrong type %s, in function `%s' "
5423 state
->current_function
->function_name(),
5424 state
->current_function
->return_type
->name
);
5426 } else if (state
->current_function
->return_type
->base_type
==
5428 YYLTYPE loc
= this->get_location();
5430 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5431 * specs add a clarification:
5433 * "A void function can only use return without a return argument, even if
5434 * the return argument has void type. Return statements only accept values:
5437 * void func2() { return func1(); } // illegal return statement"
5439 _mesa_glsl_error(& loc
, state
,
5440 "void functions can only use `return' without a "
5444 inst
= new(ctx
) ir_return(ret
);
5446 if (state
->current_function
->return_type
->base_type
!=
5448 YYLTYPE loc
= this->get_location();
5450 _mesa_glsl_error(& loc
, state
,
5451 "`return' with no value, in function %s returning "
5453 state
->current_function
->function_name());
5455 inst
= new(ctx
) ir_return
;
5458 state
->found_return
= true;
5459 instructions
->push_tail(inst
);
5464 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5465 YYLTYPE loc
= this->get_location();
5467 _mesa_glsl_error(& loc
, state
,
5468 "`discard' may only appear in a fragment shader");
5470 instructions
->push_tail(new(ctx
) ir_discard
);
5475 if (mode
== ast_continue
&&
5476 state
->loop_nesting_ast
== NULL
) {
5477 YYLTYPE loc
= this->get_location();
5479 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5480 } else if (mode
== ast_break
&&
5481 state
->loop_nesting_ast
== NULL
&&
5482 state
->switch_state
.switch_nesting_ast
== NULL
) {
5483 YYLTYPE loc
= this->get_location();
5485 _mesa_glsl_error(& loc
, state
,
5486 "break may only appear in a loop or a switch");
5488 /* For a loop, inline the for loop expression again, since we don't
5489 * know where near the end of the loop body the normal copy of it is
5490 * going to be placed. Same goes for the condition for a do-while
5493 if (state
->loop_nesting_ast
!= NULL
&&
5494 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5495 if (state
->loop_nesting_ast
->rest_expression
) {
5496 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5499 if (state
->loop_nesting_ast
->mode
==
5500 ast_iteration_statement::ast_do_while
) {
5501 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5505 if (state
->switch_state
.is_switch_innermost
&&
5506 mode
== ast_continue
) {
5507 /* Set 'continue_inside' to true. */
5508 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5509 ir_dereference_variable
*deref_continue_inside_var
=
5510 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5511 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5514 /* Break out from the switch, continue for the loop will
5515 * be called right after switch. */
5516 ir_loop_jump
*const jump
=
5517 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5518 instructions
->push_tail(jump
);
5520 } else if (state
->switch_state
.is_switch_innermost
&&
5521 mode
== ast_break
) {
5522 /* Force break out of switch by inserting a break. */
5523 ir_loop_jump
*const jump
=
5524 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5525 instructions
->push_tail(jump
);
5527 ir_loop_jump
*const jump
=
5528 new(ctx
) ir_loop_jump((mode
== ast_break
)
5529 ? ir_loop_jump::jump_break
5530 : ir_loop_jump::jump_continue
);
5531 instructions
->push_tail(jump
);
5538 /* Jump instructions do not have r-values.
5545 ast_selection_statement::hir(exec_list
*instructions
,
5546 struct _mesa_glsl_parse_state
*state
)
5550 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5552 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5554 * "Any expression whose type evaluates to a Boolean can be used as the
5555 * conditional expression bool-expression. Vector types are not accepted
5556 * as the expression to if."
5558 * The checks are separated so that higher quality diagnostics can be
5559 * generated for cases where both rules are violated.
5561 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5562 YYLTYPE loc
= this->condition
->get_location();
5564 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5568 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5570 if (then_statement
!= NULL
) {
5571 state
->symbols
->push_scope();
5572 then_statement
->hir(& stmt
->then_instructions
, state
);
5573 state
->symbols
->pop_scope();
5576 if (else_statement
!= NULL
) {
5577 state
->symbols
->push_scope();
5578 else_statement
->hir(& stmt
->else_instructions
, state
);
5579 state
->symbols
->pop_scope();
5582 instructions
->push_tail(stmt
);
5584 /* if-statements do not have r-values.
5591 ast_switch_statement::hir(exec_list
*instructions
,
5592 struct _mesa_glsl_parse_state
*state
)
5596 ir_rvalue
*const test_expression
=
5597 this->test_expression
->hir(instructions
, state
);
5599 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5601 * "The type of init-expression in a switch statement must be a
5604 if (!test_expression
->type
->is_scalar() ||
5605 !test_expression
->type
->is_integer()) {
5606 YYLTYPE loc
= this->test_expression
->get_location();
5608 _mesa_glsl_error(& loc
,
5610 "switch-statement expression must be scalar "
5614 /* Track the switch-statement nesting in a stack-like manner.
5616 struct glsl_switch_state saved
= state
->switch_state
;
5618 state
->switch_state
.is_switch_innermost
= true;
5619 state
->switch_state
.switch_nesting_ast
= this;
5620 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5621 hash_table_pointer_compare
);
5622 state
->switch_state
.previous_default
= NULL
;
5624 /* Initalize is_fallthru state to false.
5626 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5627 state
->switch_state
.is_fallthru_var
=
5628 new(ctx
) ir_variable(glsl_type::bool_type
,
5629 "switch_is_fallthru_tmp",
5631 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5633 ir_dereference_variable
*deref_is_fallthru_var
=
5634 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5635 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5638 /* Initialize continue_inside state to false.
5640 state
->switch_state
.continue_inside
=
5641 new(ctx
) ir_variable(glsl_type::bool_type
,
5642 "continue_inside_tmp",
5644 instructions
->push_tail(state
->switch_state
.continue_inside
);
5646 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5647 ir_dereference_variable
*deref_continue_inside_var
=
5648 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5649 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5652 state
->switch_state
.run_default
=
5653 new(ctx
) ir_variable(glsl_type::bool_type
,
5656 instructions
->push_tail(state
->switch_state
.run_default
);
5658 /* Loop around the switch is used for flow control. */
5659 ir_loop
* loop
= new(ctx
) ir_loop();
5660 instructions
->push_tail(loop
);
5662 /* Cache test expression.
5664 test_to_hir(&loop
->body_instructions
, state
);
5666 /* Emit code for body of switch stmt.
5668 body
->hir(&loop
->body_instructions
, state
);
5670 /* Insert a break at the end to exit loop. */
5671 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5672 loop
->body_instructions
.push_tail(jump
);
5674 /* If we are inside loop, check if continue got called inside switch. */
5675 if (state
->loop_nesting_ast
!= NULL
) {
5676 ir_dereference_variable
*deref_continue_inside
=
5677 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5678 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5679 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5681 if (state
->loop_nesting_ast
!= NULL
) {
5682 if (state
->loop_nesting_ast
->rest_expression
) {
5683 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5686 if (state
->loop_nesting_ast
->mode
==
5687 ast_iteration_statement::ast_do_while
) {
5688 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5691 irif
->then_instructions
.push_tail(jump
);
5692 instructions
->push_tail(irif
);
5695 hash_table_dtor(state
->switch_state
.labels_ht
);
5697 state
->switch_state
= saved
;
5699 /* Switch statements do not have r-values. */
5705 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5706 struct _mesa_glsl_parse_state
*state
)
5710 /* Cache value of test expression. */
5711 ir_rvalue
*const test_val
=
5712 test_expression
->hir(instructions
,
5715 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5718 ir_dereference_variable
*deref_test_var
=
5719 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5721 instructions
->push_tail(state
->switch_state
.test_var
);
5722 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5727 ast_switch_body::hir(exec_list
*instructions
,
5728 struct _mesa_glsl_parse_state
*state
)
5731 stmts
->hir(instructions
, state
);
5733 /* Switch bodies do not have r-values. */
5738 ast_case_statement_list::hir(exec_list
*instructions
,
5739 struct _mesa_glsl_parse_state
*state
)
5741 exec_list default_case
, after_default
, tmp
;
5743 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5744 case_stmt
->hir(&tmp
, state
);
5747 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5748 default_case
.append_list(&tmp
);
5752 /* If default case found, append 'after_default' list. */
5753 if (!default_case
.is_empty())
5754 after_default
.append_list(&tmp
);
5756 instructions
->append_list(&tmp
);
5759 /* Handle the default case. This is done here because default might not be
5760 * the last case. We need to add checks against following cases first to see
5761 * if default should be chosen or not.
5763 if (!default_case
.is_empty()) {
5765 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5766 ir_dereference_variable
*deref_run_default_var
=
5767 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5769 /* Choose to run default case initially, following conditional
5770 * assignments might change this.
5772 ir_assignment
*const init_var
=
5773 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5774 instructions
->push_tail(init_var
);
5776 /* Default case was the last one, no checks required. */
5777 if (after_default
.is_empty()) {
5778 instructions
->append_list(&default_case
);
5782 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5783 ir_assignment
*assign
= ir
->as_assignment();
5788 /* Clone the check between case label and init expression. */
5789 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5790 ir_expression
*clone
= exp
->clone(state
, NULL
);
5792 ir_dereference_variable
*deref_var
=
5793 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5794 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5796 ir_assignment
*const set_false
=
5797 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5799 instructions
->push_tail(set_false
);
5802 /* Append default case and all cases after it. */
5803 instructions
->append_list(&default_case
);
5804 instructions
->append_list(&after_default
);
5807 /* Case statements do not have r-values. */
5812 ast_case_statement::hir(exec_list
*instructions
,
5813 struct _mesa_glsl_parse_state
*state
)
5815 labels
->hir(instructions
, state
);
5817 /* Guard case statements depending on fallthru state. */
5818 ir_dereference_variable
*const deref_fallthru_guard
=
5819 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5820 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5822 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5823 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5825 instructions
->push_tail(test_fallthru
);
5827 /* Case statements do not have r-values. */
5833 ast_case_label_list::hir(exec_list
*instructions
,
5834 struct _mesa_glsl_parse_state
*state
)
5836 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5837 label
->hir(instructions
, state
);
5839 /* Case labels do not have r-values. */
5844 ast_case_label::hir(exec_list
*instructions
,
5845 struct _mesa_glsl_parse_state
*state
)
5849 ir_dereference_variable
*deref_fallthru_var
=
5850 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5852 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5854 /* If not default case, ... */
5855 if (this->test_value
!= NULL
) {
5856 /* Conditionally set fallthru state based on
5857 * comparison of cached test expression value to case label.
5859 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5860 ir_constant
*label_const
= label_rval
->constant_expression_value();
5863 YYLTYPE loc
= this->test_value
->get_location();
5865 _mesa_glsl_error(& loc
, state
,
5866 "switch statement case label must be a "
5867 "constant expression");
5869 /* Stuff a dummy value in to allow processing to continue. */
5870 label_const
= new(ctx
) ir_constant(0);
5872 ast_expression
*previous_label
= (ast_expression
*)
5873 hash_table_find(state
->switch_state
.labels_ht
,
5874 (void *)(uintptr_t)label_const
->value
.u
[0]);
5876 if (previous_label
) {
5877 YYLTYPE loc
= this->test_value
->get_location();
5878 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5880 loc
= previous_label
->get_location();
5881 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5883 hash_table_insert(state
->switch_state
.labels_ht
,
5885 (void *)(uintptr_t)label_const
->value
.u
[0]);
5889 ir_dereference_variable
*deref_test_var
=
5890 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5892 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5897 * From GLSL 4.40 specification section 6.2 ("Selection"):
5899 * "The type of the init-expression value in a switch statement must
5900 * be a scalar int or uint. The type of the constant-expression value
5901 * in a case label also must be a scalar int or uint. When any pair
5902 * of these values is tested for "equal value" and the types do not
5903 * match, an implicit conversion will be done to convert the int to a
5904 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5907 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5908 YYLTYPE loc
= this->test_value
->get_location();
5910 const glsl_type
*type_a
= label_const
->type
;
5911 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5913 /* Check if int->uint implicit conversion is supported. */
5914 bool integer_conversion_supported
=
5915 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5918 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5919 !integer_conversion_supported
) {
5920 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5921 "init-expression and case label (%s != %s)",
5922 type_a
->name
, type_b
->name
);
5924 /* Conversion of the case label. */
5925 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5926 if (!apply_implicit_conversion(glsl_type::uint_type
,
5927 test_cond
->operands
[0], state
))
5928 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5930 /* Conversion of the init-expression value. */
5931 if (!apply_implicit_conversion(glsl_type::uint_type
,
5932 test_cond
->operands
[1], state
))
5933 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5938 ir_assignment
*set_fallthru_on_test
=
5939 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5941 instructions
->push_tail(set_fallthru_on_test
);
5942 } else { /* default case */
5943 if (state
->switch_state
.previous_default
) {
5944 YYLTYPE loc
= this->get_location();
5945 _mesa_glsl_error(& loc
, state
,
5946 "multiple default labels in one switch");
5948 loc
= state
->switch_state
.previous_default
->get_location();
5949 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5951 state
->switch_state
.previous_default
= this;
5953 /* Set fallthru condition on 'run_default' bool. */
5954 ir_dereference_variable
*deref_run_default
=
5955 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5956 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5957 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5961 /* Set falltrhu state. */
5962 ir_assignment
*set_fallthru
=
5963 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5965 instructions
->push_tail(set_fallthru
);
5968 /* Case statements do not have r-values. */
5973 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
5974 struct _mesa_glsl_parse_state
*state
)
5978 if (condition
!= NULL
) {
5979 ir_rvalue
*const cond
=
5980 condition
->hir(instructions
, state
);
5983 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
5984 YYLTYPE loc
= condition
->get_location();
5986 _mesa_glsl_error(& loc
, state
,
5987 "loop condition must be scalar boolean");
5989 /* As the first code in the loop body, generate a block that looks
5990 * like 'if (!condition) break;' as the loop termination condition.
5992 ir_rvalue
*const not_cond
=
5993 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
5995 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
5997 ir_jump
*const break_stmt
=
5998 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6000 if_stmt
->then_instructions
.push_tail(break_stmt
);
6001 instructions
->push_tail(if_stmt
);
6008 ast_iteration_statement::hir(exec_list
*instructions
,
6009 struct _mesa_glsl_parse_state
*state
)
6013 /* For-loops and while-loops start a new scope, but do-while loops do not.
6015 if (mode
!= ast_do_while
)
6016 state
->symbols
->push_scope();
6018 if (init_statement
!= NULL
)
6019 init_statement
->hir(instructions
, state
);
6021 ir_loop
*const stmt
= new(ctx
) ir_loop();
6022 instructions
->push_tail(stmt
);
6024 /* Track the current loop nesting. */
6025 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6027 state
->loop_nesting_ast
= this;
6029 /* Likewise, indicate that following code is closest to a loop,
6030 * NOT closest to a switch.
6032 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6033 state
->switch_state
.is_switch_innermost
= false;
6035 if (mode
!= ast_do_while
)
6036 condition_to_hir(&stmt
->body_instructions
, state
);
6039 body
->hir(& stmt
->body_instructions
, state
);
6041 if (rest_expression
!= NULL
)
6042 rest_expression
->hir(& stmt
->body_instructions
, state
);
6044 if (mode
== ast_do_while
)
6045 condition_to_hir(&stmt
->body_instructions
, state
);
6047 if (mode
!= ast_do_while
)
6048 state
->symbols
->pop_scope();
6050 /* Restore previous nesting before returning. */
6051 state
->loop_nesting_ast
= nesting_ast
;
6052 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6054 /* Loops do not have r-values.
6061 * Determine if the given type is valid for establishing a default precision
6064 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6066 * "The precision statement
6068 * precision precision-qualifier type;
6070 * can be used to establish a default precision qualifier. The type field
6071 * can be either int or float or any of the sampler types, and the
6072 * precision-qualifier can be lowp, mediump, or highp."
6074 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6075 * qualifiers on sampler types, but this seems like an oversight (since the
6076 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6077 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6081 is_valid_default_precision_type(const struct glsl_type
*const type
)
6086 switch (type
->base_type
) {
6088 case GLSL_TYPE_FLOAT
:
6089 /* "int" and "float" are valid, but vectors and matrices are not. */
6090 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6091 case GLSL_TYPE_SAMPLER
:
6092 case GLSL_TYPE_IMAGE
:
6093 case GLSL_TYPE_ATOMIC_UINT
:
6102 ast_type_specifier::hir(exec_list
*instructions
,
6103 struct _mesa_glsl_parse_state
*state
)
6105 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6108 YYLTYPE loc
= this->get_location();
6110 /* If this is a precision statement, check that the type to which it is
6111 * applied is either float or int.
6113 * From section 4.5.3 of the GLSL 1.30 spec:
6114 * "The precision statement
6115 * precision precision-qualifier type;
6116 * can be used to establish a default precision qualifier. The type
6117 * field can be either int or float [...]. Any other types or
6118 * qualifiers will result in an error.
6120 if (this->default_precision
!= ast_precision_none
) {
6121 if (!state
->check_precision_qualifiers_allowed(&loc
))
6124 if (this->structure
!= NULL
) {
6125 _mesa_glsl_error(&loc
, state
,
6126 "precision qualifiers do not apply to structures");
6130 if (this->array_specifier
!= NULL
) {
6131 _mesa_glsl_error(&loc
, state
,
6132 "default precision statements do not apply to "
6137 const struct glsl_type
*const type
=
6138 state
->symbols
->get_type(this->type_name
);
6139 if (!is_valid_default_precision_type(type
)) {
6140 _mesa_glsl_error(&loc
, state
,
6141 "default precision statements apply only to "
6142 "float, int, and opaque types");
6146 if (state
->es_shader
) {
6147 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6150 * "Non-precision qualified declarations will use the precision
6151 * qualifier specified in the most recent precision statement
6152 * that is still in scope. The precision statement has the same
6153 * scoping rules as variable declarations. If it is declared
6154 * inside a compound statement, its effect stops at the end of
6155 * the innermost statement it was declared in. Precision
6156 * statements in nested scopes override precision statements in
6157 * outer scopes. Multiple precision statements for the same basic
6158 * type can appear inside the same scope, with later statements
6159 * overriding earlier statements within that scope."
6161 * Default precision specifications follow the same scope rules as
6162 * variables. So, we can track the state of the default precision
6163 * qualifiers in the symbol table, and the rules will just work. This
6164 * is a slight abuse of the symbol table, but it has the semantics
6167 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6168 this->default_precision
);
6171 /* FINISHME: Translate precision statements into IR. */
6175 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6176 * process_record_constructor() can do type-checking on C-style initializer
6177 * expressions of structs, but ast_struct_specifier should only be translated
6178 * to HIR if it is declaring the type of a structure.
6180 * The ->is_declaration field is false for initializers of variables
6181 * declared separately from the struct's type definition.
6183 * struct S { ... }; (is_declaration = true)
6184 * struct T { ... } t = { ... }; (is_declaration = true)
6185 * S s = { ... }; (is_declaration = false)
6187 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6188 return this->structure
->hir(instructions
, state
);
6195 * Process a structure or interface block tree into an array of structure fields
6197 * After parsing, where there are some syntax differnces, structures and
6198 * interface blocks are almost identical. They are similar enough that the
6199 * AST for each can be processed the same way into a set of
6200 * \c glsl_struct_field to describe the members.
6202 * If we're processing an interface block, var_mode should be the type of the
6203 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6204 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6208 * The number of fields processed. A pointer to the array structure fields is
6209 * stored in \c *fields_ret.
6212 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6213 struct _mesa_glsl_parse_state
*state
,
6214 exec_list
*declarations
,
6215 glsl_struct_field
**fields_ret
,
6217 enum glsl_matrix_layout matrix_layout
,
6218 bool allow_reserved_names
,
6219 ir_variable_mode var_mode
,
6220 ast_type_qualifier
*layout
,
6221 unsigned block_stream
,
6222 unsigned expl_location
)
6224 unsigned decl_count
= 0;
6226 /* Make an initial pass over the list of fields to determine how
6227 * many there are. Each element in this list is an ast_declarator_list.
6228 * This means that we actually need to count the number of elements in the
6229 * 'declarations' list in each of the elements.
6231 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6232 decl_count
+= decl_list
->declarations
.length();
6235 /* Allocate storage for the fields and process the field
6236 * declarations. As the declarations are processed, try to also convert
6237 * the types to HIR. This ensures that structure definitions embedded in
6238 * other structure definitions or in interface blocks are processed.
6240 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6243 bool first_member
= true;
6244 bool first_member_has_explicit_location
;
6247 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6248 const char *type_name
;
6249 YYLTYPE loc
= decl_list
->get_location();
6251 decl_list
->type
->specifier
->hir(instructions
, state
);
6253 /* Section 10.9 of the GLSL ES 1.00 specification states that
6254 * embedded structure definitions have been removed from the language.
6256 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
6257 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
6258 "not allowed in GLSL ES 1.00");
6261 const glsl_type
*decl_type
=
6262 decl_list
->type
->glsl_type(& type_name
, state
);
6264 const struct ast_type_qualifier
*const qual
=
6265 &decl_list
->type
->qualifier
;
6267 /* From section 4.3.9 of the GLSL 4.40 spec:
6269 * "[In interface blocks] opaque types are not allowed."
6271 * It should be impossible for decl_type to be NULL here. Cases that
6272 * might naturally lead to decl_type being NULL, especially for the
6273 * is_interface case, will have resulted in compilation having
6274 * already halted due to a syntax error.
6278 if (is_interface
&& decl_type
->contains_opaque()) {
6279 _mesa_glsl_error(&loc
, state
,
6280 "uniform/buffer in non-default interface block contains "
6284 if (decl_type
->contains_atomic()) {
6285 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6287 * "Members of structures cannot be declared as atomic counter
6290 _mesa_glsl_error(&loc
, state
, "atomic counter in structure, "
6291 "shader storage block or uniform block");
6294 if (decl_type
->contains_image()) {
6295 /* FINISHME: Same problem as with atomic counters.
6296 * FINISHME: Request clarification from Khronos and add
6297 * FINISHME: spec quotation here.
6299 _mesa_glsl_error(&loc
, state
,
6300 "image in structure, shader storage block or "
6304 if (qual
->flags
.q
.explicit_binding
) {
6305 _mesa_glsl_error(&loc
, state
,
6306 "binding layout qualifier cannot be applied "
6307 "to struct or interface block members");
6311 if (!first_member
) {
6312 if (!layout
->flags
.q
.explicit_location
&&
6313 ((first_member_has_explicit_location
&&
6314 !qual
->flags
.q
.explicit_location
) ||
6315 (!first_member_has_explicit_location
&&
6316 qual
->flags
.q
.explicit_location
))) {
6317 _mesa_glsl_error(&loc
, state
,
6318 "when block-level location layout qualifier "
6319 "is not supplied either all members must "
6320 "have a location layout qualifier or all "
6321 "members must not have a location layout "
6325 first_member
= false;
6326 first_member_has_explicit_location
=
6327 qual
->flags
.q
.explicit_location
;
6331 if (qual
->flags
.q
.std140
||
6332 qual
->flags
.q
.std430
||
6333 qual
->flags
.q
.packed
||
6334 qual
->flags
.q
.shared
) {
6335 _mesa_glsl_error(&loc
, state
,
6336 "uniform/shader storage block layout qualifiers "
6337 "std140, std430, packed, and shared can only be "
6338 "applied to uniform/shader storage blocks, not "
6342 if (qual
->flags
.q
.constant
) {
6343 _mesa_glsl_error(&loc
, state
,
6344 "const storage qualifier cannot be applied "
6345 "to struct or interface block members");
6348 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6350 * "A block member may be declared with a stream identifier, but
6351 * the specified stream must match the stream associated with the
6352 * containing block."
6354 if (qual
->flags
.q
.explicit_stream
) {
6355 unsigned qual_stream
;
6356 if (process_qualifier_constant(state
, &loc
, "stream",
6357 qual
->stream
, &qual_stream
) &&
6358 qual_stream
!= block_stream
) {
6359 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6360 "interface block member does not match "
6361 "the interface block (%u vs %u)", qual_stream
,
6366 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6367 _mesa_glsl_error(&loc
, state
,
6368 "interpolation qualifiers cannot be used "
6369 "with uniform interface blocks");
6372 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6373 qual
->has_auxiliary_storage()) {
6374 _mesa_glsl_error(&loc
, state
,
6375 "auxiliary storage qualifiers cannot be used "
6376 "in uniform blocks or structures.");
6379 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6380 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6381 _mesa_glsl_error(&loc
, state
,
6382 "row_major and column_major can only be "
6383 "applied to interface blocks");
6385 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6388 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6389 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6390 "readonly and writeonly.");
6393 foreach_list_typed (ast_declaration
, decl
, link
,
6394 &decl_list
->declarations
) {
6395 YYLTYPE loc
= decl
->get_location();
6397 if (!allow_reserved_names
)
6398 validate_identifier(decl
->identifier
, loc
, state
);
6400 const struct glsl_type
*field_type
=
6401 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6402 validate_array_dimensions(field_type
, state
, &loc
);
6403 fields
[i
].type
= field_type
;
6404 fields
[i
].name
= decl
->identifier
;
6405 fields
[i
].interpolation
=
6406 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
6407 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6408 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6409 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6410 fields
[i
].precision
= qual
->precision
;
6412 if (qual
->flags
.q
.explicit_location
) {
6413 unsigned qual_location
;
6414 if (process_qualifier_constant(state
, &loc
, "location",
6415 qual
->location
, &qual_location
)) {
6416 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6417 expl_location
= fields
[i
].location
+
6418 fields
[i
].type
->count_attribute_slots(false);
6421 if (layout
&& layout
->flags
.q
.explicit_location
) {
6422 fields
[i
].location
= expl_location
;
6423 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6425 fields
[i
].location
= -1;
6429 /* Propogate row- / column-major information down the fields of the
6430 * structure or interface block. Structures need this data because
6431 * the structure may contain a structure that contains ... a matrix
6432 * that need the proper layout.
6434 if (field_type
->without_array()->is_matrix()
6435 || field_type
->without_array()->is_record()) {
6436 /* If no layout is specified for the field, inherit the layout
6439 fields
[i
].matrix_layout
= matrix_layout
;
6441 if (qual
->flags
.q
.row_major
)
6442 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6443 else if (qual
->flags
.q
.column_major
)
6444 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6446 /* If we're processing an interface block, the matrix layout must
6447 * be decided by this point.
6449 assert(!is_interface
6450 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6451 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6454 /* Image qualifiers are allowed on buffer variables, which can only
6455 * be defined inside shader storage buffer objects
6457 if (layout
&& var_mode
== ir_var_shader_storage
) {
6458 /* For readonly and writeonly qualifiers the field definition,
6459 * if set, overwrites the layout qualifier.
6461 if (qual
->flags
.q
.read_only
) {
6462 fields
[i
].image_read_only
= true;
6463 fields
[i
].image_write_only
= false;
6464 } else if (qual
->flags
.q
.write_only
) {
6465 fields
[i
].image_read_only
= false;
6466 fields
[i
].image_write_only
= true;
6468 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6469 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6472 /* For other qualifiers, we set the flag if either the layout
6473 * qualifier or the field qualifier are set
6475 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6476 layout
->flags
.q
.coherent
;
6477 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6478 layout
->flags
.q
._volatile
;
6479 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6480 layout
->flags
.q
.restrict_flag
;
6487 assert(i
== decl_count
);
6489 *fields_ret
= fields
;
6495 ast_struct_specifier::hir(exec_list
*instructions
,
6496 struct _mesa_glsl_parse_state
*state
)
6498 YYLTYPE loc
= this->get_location();
6500 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6502 * "Anonymous structures are not supported; so embedded structures must
6503 * have a declarator. A name given to an embedded struct is scoped at
6504 * the same level as the struct it is embedded in."
6506 * The same section of the GLSL 1.20 spec says:
6508 * "Anonymous structures are not supported. Embedded structures are not
6511 * struct S { float f; };
6513 * S; // Error: anonymous structures disallowed
6514 * struct { ... }; // Error: embedded structures disallowed
6515 * S s; // Okay: nested structures with name are allowed
6518 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
6519 * we allow embedded structures in 1.10 only.
6521 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
6522 _mesa_glsl_error(&loc
, state
,
6523 "embedded structure declarations are not allowed");
6525 state
->struct_specifier_depth
++;
6527 unsigned expl_location
= 0;
6528 if (layout
&& layout
->flags
.q
.explicit_location
) {
6529 if (!process_qualifier_constant(state
, &loc
, "location",
6530 layout
->location
, &expl_location
)) {
6533 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6537 glsl_struct_field
*fields
;
6538 unsigned decl_count
=
6539 ast_process_struct_or_iface_block_members(instructions
,
6541 &this->declarations
,
6544 GLSL_MATRIX_LAYOUT_INHERITED
,
6545 false /* allow_reserved_names */,
6548 0, /* for interface only */
6551 validate_identifier(this->name
, loc
, state
);
6553 const glsl_type
*t
=
6554 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6556 if (!state
->symbols
->add_type(name
, t
)) {
6557 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6559 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6561 state
->num_user_structures
+ 1);
6563 s
[state
->num_user_structures
] = t
;
6564 state
->user_structures
= s
;
6565 state
->num_user_structures
++;
6569 state
->struct_specifier_depth
--;
6571 /* Structure type definitions do not have r-values.
6578 * Visitor class which detects whether a given interface block has been used.
6580 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6583 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6584 : mode(mode
), block(block
), found(false)
6588 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6590 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6594 return visit_continue
;
6597 bool usage_found() const
6603 ir_variable_mode mode
;
6604 const glsl_type
*block
;
6609 is_unsized_array_last_element(ir_variable
*v
)
6611 const glsl_type
*interface_type
= v
->get_interface_type();
6612 int length
= interface_type
->length
;
6614 assert(v
->type
->is_unsized_array());
6616 /* Check if it is the last element of the interface */
6617 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6623 ast_interface_block::hir(exec_list
*instructions
,
6624 struct _mesa_glsl_parse_state
*state
)
6626 YYLTYPE loc
= this->get_location();
6628 /* Interface blocks must be declared at global scope */
6629 if (state
->current_function
!= NULL
) {
6630 _mesa_glsl_error(&loc
, state
,
6631 "Interface block `%s' must be declared "
6636 if (!this->layout
.flags
.q
.buffer
&&
6637 this->layout
.flags
.q
.std430
) {
6638 _mesa_glsl_error(&loc
, state
,
6639 "std430 storage block layout qualifier is supported "
6640 "only for shader storage blocks");
6643 /* The ast_interface_block has a list of ast_declarator_lists. We
6644 * need to turn those into ir_variables with an association
6645 * with this uniform block.
6647 enum glsl_interface_packing packing
;
6648 if (this->layout
.flags
.q
.shared
) {
6649 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6650 } else if (this->layout
.flags
.q
.packed
) {
6651 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6652 } else if (this->layout
.flags
.q
.std430
) {
6653 packing
= GLSL_INTERFACE_PACKING_STD430
;
6655 /* The default layout is std140.
6657 packing
= GLSL_INTERFACE_PACKING_STD140
;
6660 ir_variable_mode var_mode
;
6661 const char *iface_type_name
;
6662 if (this->layout
.flags
.q
.in
) {
6663 var_mode
= ir_var_shader_in
;
6664 iface_type_name
= "in";
6665 } else if (this->layout
.flags
.q
.out
) {
6666 var_mode
= ir_var_shader_out
;
6667 iface_type_name
= "out";
6668 } else if (this->layout
.flags
.q
.uniform
) {
6669 var_mode
= ir_var_uniform
;
6670 iface_type_name
= "uniform";
6671 } else if (this->layout
.flags
.q
.buffer
) {
6672 var_mode
= ir_var_shader_storage
;
6673 iface_type_name
= "buffer";
6675 var_mode
= ir_var_auto
;
6676 iface_type_name
= "UNKNOWN";
6677 assert(!"interface block layout qualifier not found!");
6680 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6681 if (this->layout
.flags
.q
.row_major
)
6682 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6683 else if (this->layout
.flags
.q
.column_major
)
6684 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6686 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6687 exec_list declared_variables
;
6688 glsl_struct_field
*fields
;
6690 /* Treat an interface block as one level of nesting, so that embedded struct
6691 * specifiers will be disallowed.
6693 state
->struct_specifier_depth
++;
6695 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
6696 * that we don't have incompatible qualifiers
6698 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
6699 _mesa_glsl_error(&loc
, state
,
6700 "Interface block sets both readonly and writeonly");
6703 unsigned qual_stream
;
6704 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
6706 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
6707 /* If the stream qualifier is invalid it doesn't make sense to continue
6708 * on and try to compare stream layouts on member variables against it
6709 * so just return early.
6714 unsigned expl_location
= 0;
6715 if (layout
.flags
.q
.explicit_location
) {
6716 if (!process_qualifier_constant(state
, &loc
, "location",
6717 layout
.location
, &expl_location
)) {
6720 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6724 unsigned int num_variables
=
6725 ast_process_struct_or_iface_block_members(&declared_variables
,
6727 &this->declarations
,
6731 redeclaring_per_vertex
,
6737 state
->struct_specifier_depth
--;
6739 if (!redeclaring_per_vertex
) {
6740 validate_identifier(this->block_name
, loc
, state
);
6742 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6744 * "Block names have no other use within a shader beyond interface
6745 * matching; it is a compile-time error to use a block name at global
6746 * scope for anything other than as a block name."
6748 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6749 if (var
&& !var
->type
->is_interface()) {
6750 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6751 "already used in the scope.",
6756 const glsl_type
*earlier_per_vertex
= NULL
;
6757 if (redeclaring_per_vertex
) {
6758 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6759 * the named interface block gl_in, we can find it by looking at the
6760 * previous declaration of gl_in. Otherwise we can find it by looking
6761 * at the previous decalartion of any of the built-in outputs,
6764 * Also check that the instance name and array-ness of the redeclaration
6768 case ir_var_shader_in
:
6769 if (ir_variable
*earlier_gl_in
=
6770 state
->symbols
->get_variable("gl_in")) {
6771 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6773 _mesa_glsl_error(&loc
, state
,
6774 "redeclaration of gl_PerVertex input not allowed "
6776 _mesa_shader_stage_to_string(state
->stage
));
6778 if (this->instance_name
== NULL
||
6779 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
6780 !this->array_specifier
->is_single_dimension()) {
6781 _mesa_glsl_error(&loc
, state
,
6782 "gl_PerVertex input must be redeclared as "
6786 case ir_var_shader_out
:
6787 if (ir_variable
*earlier_gl_Position
=
6788 state
->symbols
->get_variable("gl_Position")) {
6789 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6790 } else if (ir_variable
*earlier_gl_out
=
6791 state
->symbols
->get_variable("gl_out")) {
6792 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6794 _mesa_glsl_error(&loc
, state
,
6795 "redeclaration of gl_PerVertex output not "
6796 "allowed in the %s shader",
6797 _mesa_shader_stage_to_string(state
->stage
));
6799 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6800 if (this->instance_name
== NULL
||
6801 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6802 _mesa_glsl_error(&loc
, state
,
6803 "gl_PerVertex output must be redeclared as "
6807 if (this->instance_name
!= NULL
) {
6808 _mesa_glsl_error(&loc
, state
,
6809 "gl_PerVertex output may not be redeclared with "
6810 "an instance name");
6815 _mesa_glsl_error(&loc
, state
,
6816 "gl_PerVertex must be declared as an input or an "
6821 if (earlier_per_vertex
== NULL
) {
6822 /* An error has already been reported. Bail out to avoid null
6823 * dereferences later in this function.
6828 /* Copy locations from the old gl_PerVertex interface block. */
6829 for (unsigned i
= 0; i
< num_variables
; i
++) {
6830 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6832 _mesa_glsl_error(&loc
, state
,
6833 "redeclaration of gl_PerVertex must be a subset "
6834 "of the built-in members of gl_PerVertex");
6836 fields
[i
].location
=
6837 earlier_per_vertex
->fields
.structure
[j
].location
;
6838 fields
[i
].interpolation
=
6839 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6840 fields
[i
].centroid
=
6841 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6843 earlier_per_vertex
->fields
.structure
[j
].sample
;
6845 earlier_per_vertex
->fields
.structure
[j
].patch
;
6846 fields
[i
].precision
=
6847 earlier_per_vertex
->fields
.structure
[j
].precision
;
6851 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6854 * If a built-in interface block is redeclared, it must appear in
6855 * the shader before any use of any member included in the built-in
6856 * declaration, or a compilation error will result.
6858 * This appears to be a clarification to the behaviour established for
6859 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6860 * regardless of GLSL version.
6862 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6863 v
.run(instructions
);
6864 if (v
.usage_found()) {
6865 _mesa_glsl_error(&loc
, state
,
6866 "redeclaration of a built-in interface block must "
6867 "appear before any use of any member of the "
6872 const glsl_type
*block_type
=
6873 glsl_type::get_interface_instance(fields
,
6878 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6879 YYLTYPE loc
= this->get_location();
6880 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6881 "already taken in the current scope",
6882 this->block_name
, iface_type_name
);
6885 /* Since interface blocks cannot contain statements, it should be
6886 * impossible for the block to generate any instructions.
6888 assert(declared_variables
.is_empty());
6890 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
6892 * Geometry shader input variables get the per-vertex values written
6893 * out by vertex shader output variables of the same names. Since a
6894 * geometry shader operates on a set of vertices, each input varying
6895 * variable (or input block, see interface blocks below) needs to be
6896 * declared as an array.
6898 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
6899 var_mode
== ir_var_shader_in
) {
6900 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
6901 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6902 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
6903 this->array_specifier
== NULL
&&
6904 var_mode
== ir_var_shader_in
) {
6905 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
6906 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
6907 this->array_specifier
== NULL
&&
6908 var_mode
== ir_var_shader_out
) {
6909 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
6913 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
6916 * "If an instance name (instance-name) is used, then it puts all the
6917 * members inside a scope within its own name space, accessed with the
6918 * field selector ( . ) operator (analogously to structures)."
6920 if (this->instance_name
) {
6921 if (redeclaring_per_vertex
) {
6922 /* When a built-in in an unnamed interface block is redeclared,
6923 * get_variable_being_redeclared() calls
6924 * check_builtin_array_max_size() to make sure that built-in array
6925 * variables aren't redeclared to illegal sizes. But we're looking
6926 * at a redeclaration of a named built-in interface block. So we
6927 * have to manually call check_builtin_array_max_size() for all parts
6928 * of the interface that are arrays.
6930 for (unsigned i
= 0; i
< num_variables
; i
++) {
6931 if (fields
[i
].type
->is_array()) {
6932 const unsigned size
= fields
[i
].type
->array_size();
6933 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
6937 validate_identifier(this->instance_name
, loc
, state
);
6942 if (this->array_specifier
!= NULL
) {
6943 const glsl_type
*block_array_type
=
6944 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
6946 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
6948 * For uniform blocks declared an array, each individual array
6949 * element corresponds to a separate buffer object backing one
6950 * instance of the block. As the array size indicates the number
6951 * of buffer objects needed, uniform block array declarations
6952 * must specify an array size.
6954 * And a few paragraphs later:
6956 * Geometry shader input blocks must be declared as arrays and
6957 * follow the array declaration and linking rules for all
6958 * geometry shader inputs. All other input and output block
6959 * arrays must specify an array size.
6961 * The same applies to tessellation shaders.
6963 * The upshot of this is that the only circumstance where an
6964 * interface array size *doesn't* need to be specified is on a
6965 * geometry shader input, tessellation control shader input,
6966 * tessellation control shader output, and tessellation evaluation
6969 if (block_array_type
->is_unsized_array()) {
6970 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
6971 state
->stage
== MESA_SHADER_TESS_CTRL
||
6972 state
->stage
== MESA_SHADER_TESS_EVAL
;
6973 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
6975 if (this->layout
.flags
.q
.in
) {
6977 _mesa_glsl_error(&loc
, state
,
6978 "unsized input block arrays not allowed in "
6980 _mesa_shader_stage_to_string(state
->stage
));
6981 } else if (this->layout
.flags
.q
.out
) {
6983 _mesa_glsl_error(&loc
, state
,
6984 "unsized output block arrays not allowed in "
6986 _mesa_shader_stage_to_string(state
->stage
));
6988 /* by elimination, this is a uniform block array */
6989 _mesa_glsl_error(&loc
, state
,
6990 "unsized uniform block arrays not allowed in "
6992 _mesa_shader_stage_to_string(state
->stage
));
6996 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
6998 * * Arrays of arrays of blocks are not allowed
7000 if (state
->es_shader
&& block_array_type
->is_array() &&
7001 block_array_type
->fields
.array
->is_array()) {
7002 _mesa_glsl_error(&loc
, state
,
7003 "arrays of arrays interface blocks are "
7007 var
= new(state
) ir_variable(block_array_type
,
7008 this->instance_name
,
7011 var
= new(state
) ir_variable(block_type
,
7012 this->instance_name
,
7016 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7017 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7019 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7020 var
->data
.read_only
= true;
7022 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7023 handle_geometry_shader_input_decl(state
, loc
, var
);
7024 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7025 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7026 handle_tess_shader_input_decl(state
, loc
, var
);
7027 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7028 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7030 for (unsigned i
= 0; i
< num_variables
; i
++) {
7031 if (fields
[i
].type
->is_unsized_array()) {
7032 if (var_mode
== ir_var_shader_storage
) {
7033 if (i
!= (num_variables
- 1)) {
7034 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7035 "only last member of a shader storage block "
7036 "can be defined as unsized array",
7040 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7042 * "If an array is declared as the last member of a shader storage
7043 * block and the size is not specified at compile-time, it is
7044 * sized at run-time. In all other cases, arrays are sized only
7047 if (state
->es_shader
) {
7048 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7049 "only last member of a shader storage block "
7050 "can be defined as unsized array",
7057 if (ir_variable
*earlier
=
7058 state
->symbols
->get_variable(this->instance_name
)) {
7059 if (!redeclaring_per_vertex
) {
7060 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7061 this->instance_name
);
7063 earlier
->data
.how_declared
= ir_var_declared_normally
;
7064 earlier
->type
= var
->type
;
7065 earlier
->reinit_interface_type(block_type
);
7068 if (this->layout
.flags
.q
.explicit_binding
) {
7069 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7073 var
->data
.stream
= qual_stream
;
7074 if (layout
.flags
.q
.explicit_location
) {
7075 var
->data
.location
= expl_location
;
7076 var
->data
.explicit_location
= true;
7079 state
->symbols
->add_variable(var
);
7080 instructions
->push_tail(var
);
7083 /* In order to have an array size, the block must also be declared with
7086 assert(this->array_specifier
== NULL
);
7088 for (unsigned i
= 0; i
< num_variables
; i
++) {
7090 new(state
) ir_variable(fields
[i
].type
,
7091 ralloc_strdup(state
, fields
[i
].name
),
7093 var
->data
.interpolation
= fields
[i
].interpolation
;
7094 var
->data
.centroid
= fields
[i
].centroid
;
7095 var
->data
.sample
= fields
[i
].sample
;
7096 var
->data
.patch
= fields
[i
].patch
;
7097 var
->data
.stream
= qual_stream
;
7098 var
->data
.location
= fields
[i
].location
;
7099 if (fields
[i
].location
!= -1)
7100 var
->data
.explicit_location
= true;
7101 var
->init_interface_type(block_type
);
7103 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7104 var
->data
.read_only
= true;
7106 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7107 if (state
->es_shader
) {
7108 var
->data
.precision
=
7109 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7113 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7114 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7115 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7117 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7120 if (var
->data
.mode
== ir_var_shader_storage
) {
7121 var
->data
.image_read_only
= fields
[i
].image_read_only
;
7122 var
->data
.image_write_only
= fields
[i
].image_write_only
;
7123 var
->data
.image_coherent
= fields
[i
].image_coherent
;
7124 var
->data
.image_volatile
= fields
[i
].image_volatile
;
7125 var
->data
.image_restrict
= fields
[i
].image_restrict
;
7128 /* Examine var name here since var may get deleted in the next call */
7129 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7131 if (redeclaring_per_vertex
) {
7132 ir_variable
*earlier
=
7133 get_variable_being_redeclared(var
, loc
, state
,
7134 true /* allow_all_redeclarations */);
7135 if (!var_is_gl_id
|| earlier
== NULL
) {
7136 _mesa_glsl_error(&loc
, state
,
7137 "redeclaration of gl_PerVertex can only "
7138 "include built-in variables");
7139 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7140 _mesa_glsl_error(&loc
, state
,
7141 "`%s' has already been redeclared",
7144 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7145 earlier
->reinit_interface_type(block_type
);
7150 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7151 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7153 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7154 * The UBO declaration itself doesn't get an ir_variable unless it
7155 * has an instance name. This is ugly.
7157 if (this->layout
.flags
.q
.explicit_binding
) {
7158 apply_explicit_binding(state
, &loc
, var
,
7159 var
->get_interface_type(), &this->layout
);
7162 if (var
->type
->is_unsized_array()) {
7163 if (var
->is_in_shader_storage_block()) {
7164 if (!is_unsized_array_last_element(var
)) {
7165 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7166 "only last member of a shader storage block "
7167 "can be defined as unsized array",
7170 var
->data
.from_ssbo_unsized_array
= true;
7172 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7174 * "If an array is declared as the last member of a shader storage
7175 * block and the size is not specified at compile-time, it is
7176 * sized at run-time. In all other cases, arrays are sized only
7179 if (state
->es_shader
) {
7180 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7181 "only last member of a shader storage block "
7182 "can be defined as unsized array",
7188 state
->symbols
->add_variable(var
);
7189 instructions
->push_tail(var
);
7192 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7193 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7195 * It is also a compilation error ... to redeclare a built-in
7196 * block and then use a member from that built-in block that was
7197 * not included in the redeclaration.
7199 * This appears to be a clarification to the behaviour established
7200 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7201 * behaviour regardless of GLSL version.
7203 * To prevent the shader from using a member that was not included in
7204 * the redeclaration, we disable any ir_variables that are still
7205 * associated with the old declaration of gl_PerVertex (since we've
7206 * already updated all of the variables contained in the new
7207 * gl_PerVertex to point to it).
7209 * As a side effect this will prevent
7210 * validate_intrastage_interface_blocks() from getting confused and
7211 * thinking there are conflicting definitions of gl_PerVertex in the
7214 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7215 ir_variable
*const var
= node
->as_variable();
7217 var
->get_interface_type() == earlier_per_vertex
&&
7218 var
->data
.mode
== var_mode
) {
7219 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7220 _mesa_glsl_error(&loc
, state
,
7221 "redeclaration of gl_PerVertex cannot "
7222 "follow a redeclaration of `%s'",
7225 state
->symbols
->disable_variable(var
->name
);
7237 ast_tcs_output_layout::hir(exec_list
*instructions
,
7238 struct _mesa_glsl_parse_state
*state
)
7240 YYLTYPE loc
= this->get_location();
7242 unsigned num_vertices
;
7243 if (!state
->out_qualifier
->vertices
->
7244 process_qualifier_constant(state
, "vertices", &num_vertices
,
7246 /* return here to stop cascading incorrect error messages */
7250 /* If any shader outputs occurred before this declaration and specified an
7251 * array size, make sure the size they specified is consistent with the
7254 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7255 _mesa_glsl_error(&loc
, state
,
7256 "this tessellation control shader output layout "
7257 "specifies %u vertices, but a previous output "
7258 "is declared with size %u",
7259 num_vertices
, state
->tcs_output_size
);
7263 state
->tcs_output_vertices_specified
= true;
7265 /* If any shader outputs occurred before this declaration and did not
7266 * specify an array size, their size is determined now.
7268 foreach_in_list (ir_instruction
, node
, instructions
) {
7269 ir_variable
*var
= node
->as_variable();
7270 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7273 /* Note: Not all tessellation control shader output are arrays. */
7274 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7277 if (var
->data
.max_array_access
>= num_vertices
) {
7278 _mesa_glsl_error(&loc
, state
,
7279 "this tessellation control shader output layout "
7280 "specifies %u vertices, but an access to element "
7281 "%u of output `%s' already exists", num_vertices
,
7282 var
->data
.max_array_access
, var
->name
);
7284 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7294 ast_gs_input_layout::hir(exec_list
*instructions
,
7295 struct _mesa_glsl_parse_state
*state
)
7297 YYLTYPE loc
= this->get_location();
7299 /* If any geometry input layout declaration preceded this one, make sure it
7300 * was consistent with this one.
7302 if (state
->gs_input_prim_type_specified
&&
7303 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7304 _mesa_glsl_error(&loc
, state
,
7305 "geometry shader input layout does not match"
7306 " previous declaration");
7310 /* If any shader inputs occurred before this declaration and specified an
7311 * array size, make sure the size they specified is consistent with the
7314 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7315 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7316 _mesa_glsl_error(&loc
, state
,
7317 "this geometry shader input layout implies %u vertices"
7318 " per primitive, but a previous input is declared"
7319 " with size %u", num_vertices
, state
->gs_input_size
);
7323 state
->gs_input_prim_type_specified
= true;
7325 /* If any shader inputs occurred before this declaration and did not
7326 * specify an array size, their size is determined now.
7328 foreach_in_list(ir_instruction
, node
, instructions
) {
7329 ir_variable
*var
= node
->as_variable();
7330 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7333 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7337 if (var
->type
->is_unsized_array()) {
7338 if (var
->data
.max_array_access
>= num_vertices
) {
7339 _mesa_glsl_error(&loc
, state
,
7340 "this geometry shader input layout implies %u"
7341 " vertices, but an access to element %u of input"
7342 " `%s' already exists", num_vertices
,
7343 var
->data
.max_array_access
, var
->name
);
7345 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7356 ast_cs_input_layout::hir(exec_list
*instructions
,
7357 struct _mesa_glsl_parse_state
*state
)
7359 YYLTYPE loc
= this->get_location();
7361 /* From the ARB_compute_shader specification:
7363 * If the local size of the shader in any dimension is greater
7364 * than the maximum size supported by the implementation for that
7365 * dimension, a compile-time error results.
7367 * It is not clear from the spec how the error should be reported if
7368 * the total size of the work group exceeds
7369 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7370 * report it at compile time as well.
7372 GLuint64 total_invocations
= 1;
7373 unsigned qual_local_size
[3];
7374 for (int i
= 0; i
< 3; i
++) {
7376 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7378 /* Infer a local_size of 1 for unspecified dimensions */
7379 if (this->local_size
[i
] == NULL
) {
7380 qual_local_size
[i
] = 1;
7381 } else if (!this->local_size
[i
]->
7382 process_qualifier_constant(state
, local_size_str
,
7383 &qual_local_size
[i
], false)) {
7384 ralloc_free(local_size_str
);
7387 ralloc_free(local_size_str
);
7389 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7390 _mesa_glsl_error(&loc
, state
,
7391 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7393 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7396 total_invocations
*= qual_local_size
[i
];
7397 if (total_invocations
>
7398 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7399 _mesa_glsl_error(&loc
, state
,
7400 "product of local_sizes exceeds "
7401 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7402 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7407 /* If any compute input layout declaration preceded this one, make sure it
7408 * was consistent with this one.
7410 if (state
->cs_input_local_size_specified
) {
7411 for (int i
= 0; i
< 3; i
++) {
7412 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7413 _mesa_glsl_error(&loc
, state
,
7414 "compute shader input layout does not match"
7415 " previous declaration");
7421 state
->cs_input_local_size_specified
= true;
7422 for (int i
= 0; i
< 3; i
++)
7423 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7425 /* We may now declare the built-in constant gl_WorkGroupSize (see
7426 * builtin_variable_generator::generate_constants() for why we didn't
7427 * declare it earlier).
7429 ir_variable
*var
= new(state
->symbols
)
7430 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7431 var
->data
.how_declared
= ir_var_declared_implicitly
;
7432 var
->data
.read_only
= true;
7433 instructions
->push_tail(var
);
7434 state
->symbols
->add_variable(var
);
7435 ir_constant_data data
;
7436 memset(&data
, 0, sizeof(data
));
7437 for (int i
= 0; i
< 3; i
++)
7438 data
.u
[i
] = qual_local_size
[i
];
7439 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7440 var
->constant_initializer
=
7441 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7442 var
->data
.has_initializer
= true;
7449 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7450 exec_list
*instructions
)
7452 bool gl_FragColor_assigned
= false;
7453 bool gl_FragData_assigned
= false;
7454 bool gl_FragSecondaryColor_assigned
= false;
7455 bool gl_FragSecondaryData_assigned
= false;
7456 bool user_defined_fs_output_assigned
= false;
7457 ir_variable
*user_defined_fs_output
= NULL
;
7459 /* It would be nice to have proper location information. */
7461 memset(&loc
, 0, sizeof(loc
));
7463 foreach_in_list(ir_instruction
, node
, instructions
) {
7464 ir_variable
*var
= node
->as_variable();
7466 if (!var
|| !var
->data
.assigned
)
7469 if (strcmp(var
->name
, "gl_FragColor") == 0)
7470 gl_FragColor_assigned
= true;
7471 else if (strcmp(var
->name
, "gl_FragData") == 0)
7472 gl_FragData_assigned
= true;
7473 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7474 gl_FragSecondaryColor_assigned
= true;
7475 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7476 gl_FragSecondaryData_assigned
= true;
7477 else if (!is_gl_identifier(var
->name
)) {
7478 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7479 var
->data
.mode
== ir_var_shader_out
) {
7480 user_defined_fs_output_assigned
= true;
7481 user_defined_fs_output
= var
;
7486 /* From the GLSL 1.30 spec:
7488 * "If a shader statically assigns a value to gl_FragColor, it
7489 * may not assign a value to any element of gl_FragData. If a
7490 * shader statically writes a value to any element of
7491 * gl_FragData, it may not assign a value to
7492 * gl_FragColor. That is, a shader may assign values to either
7493 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7494 * linked together must also consistently write just one of
7495 * these variables. Similarly, if user declared output
7496 * variables are in use (statically assigned to), then the
7497 * built-in variables gl_FragColor and gl_FragData may not be
7498 * assigned to. These incorrect usages all generate compile
7501 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7502 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7503 "`gl_FragColor' and `gl_FragData'");
7504 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7505 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7506 "`gl_FragColor' and `%s'",
7507 user_defined_fs_output
->name
);
7508 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7509 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7510 "`gl_FragSecondaryColorEXT' and"
7511 " `gl_FragSecondaryDataEXT'");
7512 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7513 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7514 "`gl_FragColor' and"
7515 " `gl_FragSecondaryDataEXT'");
7516 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7517 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7519 " `gl_FragSecondaryColorEXT'");
7520 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7521 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7522 "`gl_FragData' and `%s'",
7523 user_defined_fs_output
->name
);
7526 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7527 !state
->EXT_blend_func_extended_enable
) {
7528 _mesa_glsl_error(&loc
, state
,
7529 "Dual source blending requires EXT_blend_func_extended");
7535 remove_per_vertex_blocks(exec_list
*instructions
,
7536 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7538 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7539 * if it exists in this shader type.
7541 const glsl_type
*per_vertex
= NULL
;
7543 case ir_var_shader_in
:
7544 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7545 per_vertex
= gl_in
->get_interface_type();
7547 case ir_var_shader_out
:
7548 if (ir_variable
*gl_Position
=
7549 state
->symbols
->get_variable("gl_Position")) {
7550 per_vertex
= gl_Position
->get_interface_type();
7554 assert(!"Unexpected mode");
7558 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7559 * need to do anything.
7561 if (per_vertex
== NULL
)
7564 /* If the interface block is used by the shader, then we don't need to do
7567 interface_block_usage_visitor
v(mode
, per_vertex
);
7568 v
.run(instructions
);
7569 if (v
.usage_found())
7572 /* Remove any ir_variable declarations that refer to the interface block
7575 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7576 ir_variable
*const var
= node
->as_variable();
7577 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
7578 var
->data
.mode
== mode
) {
7579 state
->symbols
->disable_variable(var
->name
);