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/macros.h"
58 #include "main/shaderobj.h"
60 #include "ir_builder.h"
62 using namespace ir_builder
;
65 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
66 exec_list
*instructions
);
68 remove_per_vertex_blocks(exec_list
*instructions
,
69 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
72 * Visitor class that finds the first instance of any write-only variable that
73 * is ever read, if any
75 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
78 read_from_write_only_variable_visitor() : found(NULL
)
82 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
84 if (this->in_assignee
)
85 return visit_continue
;
87 ir_variable
*var
= ir
->variable_referenced();
88 /* We can have image_write_only set on both images and buffer variables,
89 * but in the former there is a distinction between reads from
90 * the variable itself (write_only) and from the memory they point to
91 * (image_write_only), while in the case of buffer variables there is
92 * no such distinction, that is why this check here is limited to
93 * buffer variables alone.
95 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
96 return visit_continue
;
98 if (var
->data
.image_write_only
) {
103 return visit_continue
;
106 ir_variable
*get_variable() {
110 virtual ir_visitor_status
visit_enter(ir_expression
*ir
)
112 /* .length() doesn't actually read anything */
113 if (ir
->operation
== ir_unop_ssbo_unsized_array_length
)
114 return visit_continue_with_parent
;
116 return visit_continue
;
124 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
126 _mesa_glsl_initialize_variables(instructions
, state
);
128 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
130 state
->current_function
= NULL
;
132 state
->toplevel_ir
= instructions
;
134 state
->gs_input_prim_type_specified
= false;
135 state
->tcs_output_vertices_specified
= false;
136 state
->cs_input_local_size_specified
= false;
138 /* Section 4.2 of the GLSL 1.20 specification states:
139 * "The built-in functions are scoped in a scope outside the global scope
140 * users declare global variables in. That is, a shader's global scope,
141 * available for user-defined functions and global variables, is nested
142 * inside the scope containing the built-in functions."
144 * Since built-in functions like ftransform() access built-in variables,
145 * it follows that those must be in the outer scope as well.
147 * We push scope here to create this nesting effect...but don't pop.
148 * This way, a shader's globals are still in the symbol table for use
151 state
->symbols
->push_scope();
153 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
154 ast
->hir(instructions
, state
);
156 detect_recursion_unlinked(state
, instructions
);
157 detect_conflicting_assignments(state
, instructions
);
159 state
->toplevel_ir
= NULL
;
161 /* Move all of the variable declarations to the front of the IR list, and
162 * reverse the order. This has the (intended!) side effect that vertex
163 * shader inputs and fragment shader outputs will appear in the IR in the
164 * same order that they appeared in the shader code. This results in the
165 * locations being assigned in the declared order. Many (arguably buggy)
166 * applications depend on this behavior, and it matches what nearly all
169 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
170 ir_variable
*const var
= node
->as_variable();
176 instructions
->push_head(var
);
179 /* Figure out if gl_FragCoord is actually used in fragment shader */
180 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
182 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
184 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
186 * If multiple shaders using members of a built-in block belonging to
187 * the same interface are linked together in the same program, they
188 * must all redeclare the built-in block in the same way, as described
189 * in section 4.3.7 "Interface Blocks" for interface block matching, or
190 * a link error will result.
192 * The phrase "using members of a built-in block" implies that if two
193 * shaders are linked together and one of them *does not use* any members
194 * of the built-in block, then that shader does not need to have a matching
195 * redeclaration of the built-in block.
197 * This appears to be a clarification to the behaviour established for
198 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
201 * The definition of "interface" in section 4.3.7 that applies here is as
204 * The boundary between adjacent programmable pipeline stages: This
205 * spans all the outputs in all compilation units of the first stage
206 * and all the inputs in all compilation units of the second stage.
208 * Therefore this rule applies to both inter- and intra-stage linking.
210 * The easiest way to implement this is to check whether the shader uses
211 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
212 * remove all the relevant variable declaration from the IR, so that the
213 * linker won't see them and complain about mismatches.
215 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
216 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
218 /* Check that we don't have reads from write-only variables */
219 read_from_write_only_variable_visitor v
;
221 ir_variable
*error_var
= v
.get_variable();
223 /* It would be nice to have proper location information, but for that
224 * we would need to check this as we process each kind of AST node
227 memset(&loc
, 0, sizeof(loc
));
228 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
234 static ir_expression_operation
235 get_implicit_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
236 struct _mesa_glsl_parse_state
*state
)
238 switch (to
->base_type
) {
239 case GLSL_TYPE_FLOAT
:
240 switch (from
->base_type
) {
241 case GLSL_TYPE_INT
: return ir_unop_i2f
;
242 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
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 /* ESSL does not allow implicit conversions */
295 if (state
->es_shader
)
298 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
300 * "There are no implicit array or structure conversions. For
301 * example, an array of int cannot be implicitly converted to an
304 if (!to
->is_numeric() || !from
->type
->is_numeric())
307 /* We don't actually want the specific type `to`, we want a type
308 * with the same base type as `to`, but the same vector width as
311 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
312 from
->type
->matrix_columns
);
314 ir_expression_operation op
= get_implicit_conversion_operation(to
, from
->type
, state
);
316 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
324 static const struct glsl_type
*
325 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
327 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
329 const glsl_type
*type_a
= value_a
->type
;
330 const glsl_type
*type_b
= value_b
->type
;
332 /* From GLSL 1.50 spec, page 56:
334 * "The arithmetic binary operators add (+), subtract (-),
335 * multiply (*), and divide (/) operate on integer and
336 * floating-point scalars, vectors, and matrices."
338 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
339 _mesa_glsl_error(loc
, state
,
340 "operands to arithmetic operators must be numeric");
341 return glsl_type::error_type
;
345 /* "If one operand is floating-point based and the other is
346 * not, then the conversions from Section 4.1.10 "Implicit
347 * Conversions" are applied to the non-floating-point-based operand."
349 if (!apply_implicit_conversion(type_a
, value_b
, state
)
350 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
351 _mesa_glsl_error(loc
, state
,
352 "could not implicitly convert operands to "
353 "arithmetic operator");
354 return glsl_type::error_type
;
356 type_a
= value_a
->type
;
357 type_b
= value_b
->type
;
359 /* "If the operands are integer types, they must both be signed or
362 * From this rule and the preceeding conversion it can be inferred that
363 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
364 * The is_numeric check above already filtered out the case where either
365 * type is not one of these, so now the base types need only be tested for
368 if (type_a
->base_type
!= type_b
->base_type
) {
369 _mesa_glsl_error(loc
, state
,
370 "base type mismatch for arithmetic operator");
371 return glsl_type::error_type
;
374 /* "All arithmetic binary operators result in the same fundamental type
375 * (signed integer, unsigned integer, or floating-point) as the
376 * operands they operate on, after operand type conversion. After
377 * conversion, the following cases are valid
379 * * The two operands are scalars. In this case the operation is
380 * applied, resulting in a scalar."
382 if (type_a
->is_scalar() && type_b
->is_scalar())
385 /* "* One operand is a scalar, and the other is a vector or matrix.
386 * In this case, the scalar operation is applied independently to each
387 * component of the vector or matrix, resulting in the same size
390 if (type_a
->is_scalar()) {
391 if (!type_b
->is_scalar())
393 } else if (type_b
->is_scalar()) {
397 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
398 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
401 assert(!type_a
->is_scalar());
402 assert(!type_b
->is_scalar());
404 /* "* The two operands are vectors of the same size. In this case, the
405 * operation is done component-wise resulting in the same size
408 if (type_a
->is_vector() && type_b
->is_vector()) {
409 if (type_a
== type_b
) {
412 _mesa_glsl_error(loc
, state
,
413 "vector size mismatch for arithmetic operator");
414 return glsl_type::error_type
;
418 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
419 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
420 * <vector, vector> have been handled. At least one of the operands must
421 * be matrix. Further, since there are no integer matrix types, the base
422 * type of both operands must be float.
424 assert(type_a
->is_matrix() || type_b
->is_matrix());
425 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
426 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
427 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
428 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
430 /* "* The operator is add (+), subtract (-), or divide (/), and the
431 * operands are matrices with the same number of rows and the same
432 * number of columns. In this case, the operation is done component-
433 * wise resulting in the same size matrix."
434 * * The operator is multiply (*), where both operands are matrices or
435 * one operand is a vector and the other a matrix. A right vector
436 * operand is treated as a column vector and a left vector operand as a
437 * row vector. In all these cases, it is required that the number of
438 * columns of the left operand is equal to the number of rows of the
439 * right operand. Then, the multiply (*) operation does a linear
440 * algebraic multiply, yielding an object that has the same number of
441 * rows as the left operand and the same number of columns as the right
442 * operand. Section 5.10 "Vector and Matrix Operations" explains in
443 * more detail how vectors and matrices are operated on."
446 if (type_a
== type_b
)
449 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
451 if (type
== glsl_type::error_type
) {
452 _mesa_glsl_error(loc
, state
,
453 "size mismatch for matrix multiplication");
460 /* "All other cases are illegal."
462 _mesa_glsl_error(loc
, state
, "type mismatch");
463 return glsl_type::error_type
;
467 static const struct glsl_type
*
468 unary_arithmetic_result_type(const struct glsl_type
*type
,
469 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
471 /* From GLSL 1.50 spec, page 57:
473 * "The arithmetic unary operators negate (-), post- and pre-increment
474 * and decrement (-- and ++) operate on integer or floating-point
475 * values (including vectors and matrices). All unary operators work
476 * component-wise on their operands. These result with the same type
479 if (!type
->is_numeric()) {
480 _mesa_glsl_error(loc
, state
,
481 "operands to arithmetic operators must be numeric");
482 return glsl_type::error_type
;
489 * \brief Return the result type of a bit-logic operation.
491 * If the given types to the bit-logic operator are invalid, return
492 * glsl_type::error_type.
494 * \param value_a LHS of bit-logic op
495 * \param value_b RHS of bit-logic op
497 static const struct glsl_type
*
498 bit_logic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
500 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
502 const glsl_type
*type_a
= value_a
->type
;
503 const glsl_type
*type_b
= value_b
->type
;
505 if (!state
->check_bitwise_operations_allowed(loc
)) {
506 return glsl_type::error_type
;
509 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
511 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
512 * (|). The operands must be of type signed or unsigned integers or
515 if (!type_a
->is_integer()) {
516 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
517 ast_expression::operator_string(op
));
518 return glsl_type::error_type
;
520 if (!type_b
->is_integer()) {
521 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
522 ast_expression::operator_string(op
));
523 return glsl_type::error_type
;
526 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
527 * make sense for bitwise operations, as they don't operate on floats.
529 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
530 * here. It wasn't clear whether or not we should apply them to bitwise
531 * operations. However, Khronos has decided that they should in future
532 * language revisions. Applications also rely on this behavior. We opt
533 * to apply them in general, but issue a portability warning.
535 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
537 if (type_a
->base_type
!= type_b
->base_type
) {
538 if (!apply_implicit_conversion(type_a
, value_b
, state
)
539 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
540 _mesa_glsl_error(loc
, state
,
541 "could not implicitly convert operands to "
543 ast_expression::operator_string(op
));
544 return glsl_type::error_type
;
546 _mesa_glsl_warning(loc
, state
,
547 "some implementations may not support implicit "
548 "int -> uint conversions for `%s' operators; "
549 "consider casting explicitly for portability",
550 ast_expression::operator_string(op
));
552 type_a
= value_a
->type
;
553 type_b
= value_b
->type
;
556 /* "The fundamental types of the operands (signed or unsigned) must
559 if (type_a
->base_type
!= type_b
->base_type
) {
560 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
561 "base type", ast_expression::operator_string(op
));
562 return glsl_type::error_type
;
565 /* "The operands cannot be vectors of differing size." */
566 if (type_a
->is_vector() &&
567 type_b
->is_vector() &&
568 type_a
->vector_elements
!= type_b
->vector_elements
) {
569 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
570 "different sizes", ast_expression::operator_string(op
));
571 return glsl_type::error_type
;
574 /* "If one operand is a scalar and the other a vector, the scalar is
575 * applied component-wise to the vector, resulting in the same type as
576 * the vector. The fundamental types of the operands [...] will be the
577 * resulting fundamental type."
579 if (type_a
->is_scalar())
585 static const struct glsl_type
*
586 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
587 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
589 const glsl_type
*type_a
= value_a
->type
;
590 const glsl_type
*type_b
= value_b
->type
;
592 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
593 return glsl_type::error_type
;
596 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
598 * "The operator modulus (%) operates on signed or unsigned integers or
601 if (!type_a
->is_integer()) {
602 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
603 return glsl_type::error_type
;
605 if (!type_b
->is_integer()) {
606 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
607 return glsl_type::error_type
;
610 /* "If the fundamental types in the operands do not match, then the
611 * conversions from section 4.1.10 "Implicit Conversions" are applied
612 * to create matching types."
614 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
615 * int -> uint conversion rules. Prior to that, there were no implicit
616 * conversions. So it's harmless to apply them universally - no implicit
617 * conversions will exist. If the types don't match, we'll receive false,
618 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
620 * "The operand types must both be signed or unsigned."
622 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
623 !apply_implicit_conversion(type_b
, value_a
, state
)) {
624 _mesa_glsl_error(loc
, state
,
625 "could not implicitly convert operands to "
626 "modulus (%%) operator");
627 return glsl_type::error_type
;
629 type_a
= value_a
->type
;
630 type_b
= value_b
->type
;
632 /* "The operands cannot be vectors of differing size. If one operand is
633 * a scalar and the other vector, then the scalar is applied component-
634 * wise to the vector, resulting in the same type as the vector. If both
635 * are vectors of the same size, the result is computed component-wise."
637 if (type_a
->is_vector()) {
638 if (!type_b
->is_vector()
639 || (type_a
->vector_elements
== type_b
->vector_elements
))
644 /* "The operator modulus (%) is not defined for any other data types
645 * (non-integer types)."
647 _mesa_glsl_error(loc
, state
, "type mismatch");
648 return glsl_type::error_type
;
652 static const struct glsl_type
*
653 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
654 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
656 const glsl_type
*type_a
= value_a
->type
;
657 const glsl_type
*type_b
= value_b
->type
;
659 /* From GLSL 1.50 spec, page 56:
660 * "The relational operators greater than (>), less than (<), greater
661 * than or equal (>=), and less than or equal (<=) operate only on
662 * scalar integer and scalar floating-point expressions."
664 if (!type_a
->is_numeric()
665 || !type_b
->is_numeric()
666 || !type_a
->is_scalar()
667 || !type_b
->is_scalar()) {
668 _mesa_glsl_error(loc
, state
,
669 "operands to relational operators must be scalar and "
671 return glsl_type::error_type
;
674 /* "Either the operands' types must match, or the conversions from
675 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
676 * operand, after which the types must match."
678 if (!apply_implicit_conversion(type_a
, value_b
, state
)
679 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
680 _mesa_glsl_error(loc
, state
,
681 "could not implicitly convert operands to "
682 "relational operator");
683 return glsl_type::error_type
;
685 type_a
= value_a
->type
;
686 type_b
= value_b
->type
;
688 if (type_a
->base_type
!= type_b
->base_type
) {
689 _mesa_glsl_error(loc
, state
, "base type mismatch");
690 return glsl_type::error_type
;
693 /* "The result is scalar Boolean."
695 return glsl_type::bool_type
;
699 * \brief Return the result type of a bit-shift operation.
701 * If the given types to the bit-shift operator are invalid, return
702 * glsl_type::error_type.
704 * \param type_a Type of LHS of bit-shift op
705 * \param type_b Type of RHS of bit-shift op
707 static const struct glsl_type
*
708 shift_result_type(const struct glsl_type
*type_a
,
709 const struct glsl_type
*type_b
,
711 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
713 if (!state
->check_bitwise_operations_allowed(loc
)) {
714 return glsl_type::error_type
;
717 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
719 * "The shift operators (<<) and (>>). For both operators, the operands
720 * must be signed or unsigned integers or integer vectors. One operand
721 * can be signed while the other is unsigned."
723 if (!type_a
->is_integer()) {
724 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
725 "integer vector", ast_expression::operator_string(op
));
726 return glsl_type::error_type
;
729 if (!type_b
->is_integer()) {
730 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
731 "integer vector", ast_expression::operator_string(op
));
732 return glsl_type::error_type
;
735 /* "If the first operand is a scalar, the second operand has to be
738 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
739 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
740 "second must be scalar as well",
741 ast_expression::operator_string(op
));
742 return glsl_type::error_type
;
745 /* If both operands are vectors, check that they have same number of
748 if (type_a
->is_vector() &&
749 type_b
->is_vector() &&
750 type_a
->vector_elements
!= type_b
->vector_elements
) {
751 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
752 "have same number of elements",
753 ast_expression::operator_string(op
));
754 return glsl_type::error_type
;
757 /* "In all cases, the resulting type will be the same type as the left
764 * Returns the innermost array index expression in an rvalue tree.
765 * This is the largest indexing level -- if an array of blocks, then
766 * it is the block index rather than an indexing expression for an
767 * array-typed member of an array of blocks.
770 find_innermost_array_index(ir_rvalue
*rv
)
772 ir_dereference_array
*last
= NULL
;
774 if (rv
->as_dereference_array()) {
775 last
= rv
->as_dereference_array();
777 } else if (rv
->as_dereference_record())
778 rv
= rv
->as_dereference_record()->record
;
779 else if (rv
->as_swizzle())
780 rv
= rv
->as_swizzle()->val
;
786 return last
->array_index
;
792 * Validates that a value can be assigned to a location with a specified type
794 * Validates that \c rhs can be assigned to some location. If the types are
795 * not an exact match but an automatic conversion is possible, \c rhs will be
799 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
800 * Otherwise the actual RHS to be assigned will be returned. This may be
801 * \c rhs, or it may be \c rhs after some type conversion.
804 * In addition to being used for assignments, this function is used to
805 * type-check return values.
808 validate_assignment(struct _mesa_glsl_parse_state
*state
,
809 YYLTYPE loc
, ir_rvalue
*lhs
,
810 ir_rvalue
*rhs
, bool is_initializer
)
812 /* If there is already some error in the RHS, just return it. Anything
813 * else will lead to an avalanche of error message back to the user.
815 if (rhs
->type
->is_error())
818 /* In the Tessellation Control Shader:
819 * If a per-vertex output variable is used as an l-value, it is an error
820 * if the expression indicating the vertex number is not the identifier
823 if (state
->stage
== MESA_SHADER_TESS_CTRL
&& !lhs
->type
->is_error()) {
824 ir_variable
*var
= lhs
->variable_referenced();
825 if (var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
826 ir_rvalue
*index
= find_innermost_array_index(lhs
);
827 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
828 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
829 _mesa_glsl_error(&loc
, state
,
830 "Tessellation control shader outputs can only "
831 "be indexed by gl_InvocationID");
837 /* If the types are identical, the assignment can trivially proceed.
839 if (rhs
->type
== lhs
->type
)
842 /* If the array element types are the same and the LHS is unsized,
843 * the assignment is okay for initializers embedded in variable
846 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
847 * is handled by ir_dereference::is_lvalue.
849 const glsl_type
*lhs_t
= lhs
->type
;
850 const glsl_type
*rhs_t
= rhs
->type
;
851 bool unsized_array
= false;
852 while(lhs_t
->is_array()) {
854 break; /* the rest of the inner arrays match so break out early */
855 if (!rhs_t
->is_array()) {
856 unsized_array
= false;
857 break; /* number of dimensions mismatch */
859 if (lhs_t
->length
== rhs_t
->length
) {
860 lhs_t
= lhs_t
->fields
.array
;
861 rhs_t
= rhs_t
->fields
.array
;
863 } else if (lhs_t
->is_unsized_array()) {
864 unsized_array
= true;
866 unsized_array
= false;
867 break; /* sized array mismatch */
869 lhs_t
= lhs_t
->fields
.array
;
870 rhs_t
= rhs_t
->fields
.array
;
873 if (is_initializer
) {
876 _mesa_glsl_error(&loc
, state
,
877 "implicitly sized arrays cannot be assigned");
882 /* Check for implicit conversion in GLSL 1.20 */
883 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
884 if (rhs
->type
== lhs
->type
)
888 _mesa_glsl_error(&loc
, state
,
889 "%s of type %s cannot be assigned to "
890 "variable of type %s",
891 is_initializer
? "initializer" : "value",
892 rhs
->type
->name
, lhs
->type
->name
);
898 mark_whole_array_access(ir_rvalue
*access
)
900 ir_dereference_variable
*deref
= access
->as_dereference_variable();
902 if (deref
&& deref
->var
) {
903 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
908 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
909 const char *non_lvalue_description
,
910 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
911 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
916 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
918 ir_variable
*lhs_var
= lhs
->variable_referenced();
920 lhs_var
->data
.assigned
= true;
922 if (!error_emitted
) {
923 if (non_lvalue_description
!= NULL
) {
924 _mesa_glsl_error(&lhs_loc
, state
,
926 non_lvalue_description
);
927 error_emitted
= true;
928 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
929 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
930 lhs_var
->data
.image_read_only
))) {
931 /* We can have image_read_only set on both images and buffer variables,
932 * but in the former there is a distinction between assignments to
933 * the variable itself (read_only) and to the memory they point to
934 * (image_read_only), while in the case of buffer variables there is
935 * no such distinction, that is why this check here is limited to
936 * buffer variables alone.
938 _mesa_glsl_error(&lhs_loc
, state
,
939 "assignment to read-only variable '%s'",
941 error_emitted
= true;
942 } else if (lhs
->type
->is_array() &&
943 !state
->check_version(120, 300, &lhs_loc
,
944 "whole array assignment forbidden")) {
945 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
947 * "Other binary or unary expressions, non-dereferenced
948 * arrays, function names, swizzles with repeated fields,
949 * and constants cannot be l-values."
951 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
953 error_emitted
= true;
954 } else if (!lhs
->is_lvalue()) {
955 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
956 error_emitted
= true;
961 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
962 if (new_rhs
!= NULL
) {
965 /* If the LHS array was not declared with a size, it takes it size from
966 * the RHS. If the LHS is an l-value and a whole array, it must be a
967 * dereference of a variable. Any other case would require that the LHS
968 * is either not an l-value or not a whole array.
970 if (lhs
->type
->is_unsized_array()) {
971 ir_dereference
*const d
= lhs
->as_dereference();
975 ir_variable
*const var
= d
->variable_referenced();
979 if (var
->data
.max_array_access
>= rhs
->type
->array_size()) {
980 /* FINISHME: This should actually log the location of the RHS. */
981 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
983 var
->data
.max_array_access
);
986 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
987 rhs
->type
->array_size());
990 if (lhs
->type
->is_array()) {
991 mark_whole_array_access(rhs
);
992 mark_whole_array_access(lhs
);
996 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
997 * but not post_inc) need the converted assigned value as an rvalue
998 * to handle things like:
1003 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1005 instructions
->push_tail(var
);
1006 instructions
->push_tail(assign(var
, rhs
));
1008 if (!error_emitted
) {
1009 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
1010 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1012 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
1014 *out_rvalue
= rvalue
;
1017 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1021 return error_emitted
;
1025 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1027 void *ctx
= ralloc_parent(lvalue
);
1030 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1032 instructions
->push_tail(var
);
1034 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1037 return new(ctx
) ir_dereference_variable(var
);
1042 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1044 (void) instructions
;
1051 ast_node::has_sequence_subexpression() const
1057 ast_node::set_is_lhs(bool /* new_value */)
1062 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1063 struct _mesa_glsl_parse_state
*state
)
1065 (void)hir(instructions
, state
);
1069 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1070 struct _mesa_glsl_parse_state
*state
)
1072 (void)hir(instructions
, state
);
1076 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1079 ir_rvalue
*cmp
= NULL
;
1081 if (operation
== ir_binop_all_equal
)
1082 join_op
= ir_binop_logic_and
;
1084 join_op
= ir_binop_logic_or
;
1086 switch (op0
->type
->base_type
) {
1087 case GLSL_TYPE_FLOAT
:
1088 case GLSL_TYPE_UINT
:
1090 case GLSL_TYPE_BOOL
:
1091 case GLSL_TYPE_DOUBLE
:
1092 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1094 case GLSL_TYPE_ARRAY
: {
1095 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1096 ir_rvalue
*e0
, *e1
, *result
;
1098 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1099 new(mem_ctx
) ir_constant(i
));
1100 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1101 new(mem_ctx
) ir_constant(i
));
1102 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1105 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1111 mark_whole_array_access(op0
);
1112 mark_whole_array_access(op1
);
1116 case GLSL_TYPE_STRUCT
: {
1117 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1118 ir_rvalue
*e0
, *e1
, *result
;
1119 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1121 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1123 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1125 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1128 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1136 case GLSL_TYPE_ERROR
:
1137 case GLSL_TYPE_VOID
:
1138 case GLSL_TYPE_SAMPLER
:
1139 case GLSL_TYPE_IMAGE
:
1140 case GLSL_TYPE_INTERFACE
:
1141 case GLSL_TYPE_ATOMIC_UINT
:
1142 case GLSL_TYPE_SUBROUTINE
:
1143 case GLSL_TYPE_FUNCTION
:
1144 /* I assume a comparison of a struct containing a sampler just
1145 * ignores the sampler present in the type.
1151 cmp
= new(mem_ctx
) ir_constant(true);
1156 /* For logical operations, we want to ensure that the operands are
1157 * scalar booleans. If it isn't, emit an error and return a constant
1158 * boolean to avoid triggering cascading error messages.
1161 get_scalar_boolean_operand(exec_list
*instructions
,
1162 struct _mesa_glsl_parse_state
*state
,
1163 ast_expression
*parent_expr
,
1165 const char *operand_name
,
1166 bool *error_emitted
)
1168 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1170 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1172 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1175 if (!*error_emitted
) {
1176 YYLTYPE loc
= expr
->get_location();
1177 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1179 parent_expr
->operator_string(parent_expr
->oper
));
1180 *error_emitted
= true;
1183 return new(ctx
) ir_constant(true);
1187 * If name refers to a builtin array whose maximum allowed size is less than
1188 * size, report an error and return true. Otherwise return false.
1191 check_builtin_array_max_size(const char *name
, unsigned size
,
1192 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1194 if ((strcmp("gl_TexCoord", name
) == 0)
1195 && (size
> state
->Const
.MaxTextureCoords
)) {
1196 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1198 * "The size [of gl_TexCoord] can be at most
1199 * gl_MaxTextureCoords."
1201 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1202 "be larger than gl_MaxTextureCoords (%u)",
1203 state
->Const
.MaxTextureCoords
);
1204 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1205 state
->clip_dist_size
= size
;
1206 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1207 /* From section 7.1 (Vertex Shader Special Variables) of the
1210 * "The gl_ClipDistance array is predeclared as unsized and
1211 * must be sized by the shader either redeclaring it with a
1212 * size or indexing it only with integral constant
1213 * expressions. ... The size can be at most
1214 * gl_MaxClipDistances."
1216 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1217 "be larger than gl_MaxClipDistances (%u)",
1218 state
->Const
.MaxClipPlanes
);
1220 } else if (strcmp("gl_CullDistance", name
) == 0) {
1221 state
->cull_dist_size
= size
;
1222 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1223 /* From the ARB_cull_distance spec:
1225 * "The gl_CullDistance array is predeclared as unsized and
1226 * must be sized by the shader either redeclaring it with
1227 * a size or indexing it only with integral constant
1228 * expressions. The size determines the number and set of
1229 * enabled cull distances and can be at most
1230 * gl_MaxCullDistances."
1232 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1233 "be larger than gl_MaxCullDistances (%u)",
1234 state
->Const
.MaxClipPlanes
);
1240 * Create the constant 1, of a which is appropriate for incrementing and
1241 * decrementing values of the given GLSL type. For example, if type is vec4,
1242 * this creates a constant value of 1.0 having type float.
1244 * If the given type is invalid for increment and decrement operators, return
1245 * a floating point 1--the error will be detected later.
1248 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1250 switch (type
->base_type
) {
1251 case GLSL_TYPE_UINT
:
1252 return new(ctx
) ir_constant((unsigned) 1);
1254 return new(ctx
) ir_constant(1);
1256 case GLSL_TYPE_FLOAT
:
1257 return new(ctx
) ir_constant(1.0f
);
1262 ast_expression::hir(exec_list
*instructions
,
1263 struct _mesa_glsl_parse_state
*state
)
1265 return do_hir(instructions
, state
, true);
1269 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1270 struct _mesa_glsl_parse_state
*state
)
1272 do_hir(instructions
, state
, false);
1276 ast_expression::set_is_lhs(bool new_value
)
1278 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1279 * if we lack a identifier we can just skip it.
1281 if (this->primary_expression
.identifier
== NULL
)
1284 this->is_lhs
= new_value
;
1286 /* We need to go through the subexpressions tree to cover cases like
1287 * ast_field_selection
1289 if (this->subexpressions
[0] != NULL
)
1290 this->subexpressions
[0]->set_is_lhs(new_value
);
1294 ast_expression::do_hir(exec_list
*instructions
,
1295 struct _mesa_glsl_parse_state
*state
,
1299 static const int operations
[AST_NUM_OPERATORS
] = {
1300 -1, /* ast_assign doesn't convert to ir_expression. */
1301 -1, /* ast_plus doesn't convert to ir_expression. */
1315 ir_binop_any_nequal
,
1325 /* Note: The following block of expression types actually convert
1326 * to multiple IR instructions.
1328 ir_binop_mul
, /* ast_mul_assign */
1329 ir_binop_div
, /* ast_div_assign */
1330 ir_binop_mod
, /* ast_mod_assign */
1331 ir_binop_add
, /* ast_add_assign */
1332 ir_binop_sub
, /* ast_sub_assign */
1333 ir_binop_lshift
, /* ast_ls_assign */
1334 ir_binop_rshift
, /* ast_rs_assign */
1335 ir_binop_bit_and
, /* ast_and_assign */
1336 ir_binop_bit_xor
, /* ast_xor_assign */
1337 ir_binop_bit_or
, /* ast_or_assign */
1339 -1, /* ast_conditional doesn't convert to ir_expression. */
1340 ir_binop_add
, /* ast_pre_inc. */
1341 ir_binop_sub
, /* ast_pre_dec. */
1342 ir_binop_add
, /* ast_post_inc. */
1343 ir_binop_sub
, /* ast_post_dec. */
1344 -1, /* ast_field_selection doesn't conv to ir_expression. */
1345 -1, /* ast_array_index doesn't convert to ir_expression. */
1346 -1, /* ast_function_call doesn't conv to ir_expression. */
1347 -1, /* ast_identifier doesn't convert to ir_expression. */
1348 -1, /* ast_int_constant doesn't convert to ir_expression. */
1349 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1350 -1, /* ast_float_constant doesn't conv to ir_expression. */
1351 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1352 -1, /* ast_sequence doesn't convert to ir_expression. */
1354 ir_rvalue
*result
= NULL
;
1356 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1357 bool error_emitted
= false;
1360 loc
= this->get_location();
1362 switch (this->oper
) {
1364 assert(!"ast_aggregate: Should never get here.");
1368 this->subexpressions
[0]->set_is_lhs(true);
1369 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1370 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1373 do_assignment(instructions
, state
,
1374 this->subexpressions
[0]->non_lvalue_description
,
1375 op
[0], op
[1], &result
, needs_rvalue
, false,
1376 this->subexpressions
[0]->get_location());
1381 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1383 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1385 error_emitted
= type
->is_error();
1391 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1393 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1395 error_emitted
= type
->is_error();
1397 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1405 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1406 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1408 type
= arithmetic_result_type(op
[0], op
[1],
1409 (this->oper
== ast_mul
),
1411 error_emitted
= type
->is_error();
1413 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1418 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1419 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1421 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1423 assert(operations
[this->oper
] == ir_binop_mod
);
1425 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1427 error_emitted
= type
->is_error();
1432 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1433 error_emitted
= true;
1436 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1437 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1438 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1440 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1442 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1449 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1450 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1452 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1454 /* The relational operators must either generate an error or result
1455 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1457 assert(type
->is_error()
1458 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1459 && type
->is_scalar()));
1461 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1463 error_emitted
= type
->is_error();
1468 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1469 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1471 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1473 * "The equality operators equal (==), and not equal (!=)
1474 * operate on all types. They result in a scalar Boolean. If
1475 * the operand types do not match, then there must be a
1476 * conversion from Section 4.1.10 "Implicit Conversions"
1477 * applied to one operand that can make them match, in which
1478 * case this conversion is done."
1481 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1482 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1483 "no operation `%1$s' exists that takes a left-hand "
1484 "operand of type 'void' or a right operand of type "
1485 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1486 error_emitted
= true;
1487 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1488 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1489 || (op
[0]->type
!= op
[1]->type
)) {
1490 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1491 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1492 error_emitted
= true;
1493 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1494 !state
->check_version(120, 300, &loc
,
1495 "array comparisons forbidden")) {
1496 error_emitted
= true;
1497 } else if ((op
[0]->type
->contains_opaque() ||
1498 op
[1]->type
->contains_opaque())) {
1499 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1500 error_emitted
= true;
1503 if (error_emitted
) {
1504 result
= new(ctx
) ir_constant(false);
1506 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1507 assert(result
->type
== glsl_type::bool_type
);
1514 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1515 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1516 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1517 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1519 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1523 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1525 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1526 error_emitted
= true;
1529 if (!op
[0]->type
->is_integer()) {
1530 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1531 error_emitted
= true;
1534 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1535 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1538 case ast_logic_and
: {
1539 exec_list rhs_instructions
;
1540 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1541 "LHS", &error_emitted
);
1542 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1543 "RHS", &error_emitted
);
1545 if (rhs_instructions
.is_empty()) {
1546 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1547 type
= result
->type
;
1549 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1552 instructions
->push_tail(tmp
);
1554 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1555 instructions
->push_tail(stmt
);
1557 stmt
->then_instructions
.append_list(&rhs_instructions
);
1558 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1559 ir_assignment
*const then_assign
=
1560 new(ctx
) ir_assignment(then_deref
, op
[1]);
1561 stmt
->then_instructions
.push_tail(then_assign
);
1563 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1564 ir_assignment
*const else_assign
=
1565 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1566 stmt
->else_instructions
.push_tail(else_assign
);
1568 result
= new(ctx
) ir_dereference_variable(tmp
);
1574 case ast_logic_or
: {
1575 exec_list rhs_instructions
;
1576 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1577 "LHS", &error_emitted
);
1578 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1579 "RHS", &error_emitted
);
1581 if (rhs_instructions
.is_empty()) {
1582 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1583 type
= result
->type
;
1585 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1588 instructions
->push_tail(tmp
);
1590 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1591 instructions
->push_tail(stmt
);
1593 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1594 ir_assignment
*const then_assign
=
1595 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1596 stmt
->then_instructions
.push_tail(then_assign
);
1598 stmt
->else_instructions
.append_list(&rhs_instructions
);
1599 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1600 ir_assignment
*const else_assign
=
1601 new(ctx
) ir_assignment(else_deref
, op
[1]);
1602 stmt
->else_instructions
.push_tail(else_assign
);
1604 result
= new(ctx
) ir_dereference_variable(tmp
);
1611 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1613 * "The logical binary operators and (&&), or ( | | ), and
1614 * exclusive or (^^). They operate only on two Boolean
1615 * expressions and result in a Boolean expression."
1617 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1619 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1622 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1627 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1628 "operand", &error_emitted
);
1630 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1634 case ast_mul_assign
:
1635 case ast_div_assign
:
1636 case ast_add_assign
:
1637 case ast_sub_assign
: {
1638 this->subexpressions
[0]->set_is_lhs(true);
1639 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1640 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1642 type
= arithmetic_result_type(op
[0], op
[1],
1643 (this->oper
== ast_mul_assign
),
1646 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1650 do_assignment(instructions
, state
,
1651 this->subexpressions
[0]->non_lvalue_description
,
1652 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1653 &result
, needs_rvalue
, false,
1654 this->subexpressions
[0]->get_location());
1656 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1657 * explicitly test for this because none of the binary expression
1658 * operators allow array operands either.
1664 case ast_mod_assign
: {
1665 this->subexpressions
[0]->set_is_lhs(true);
1666 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1667 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1669 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1671 assert(operations
[this->oper
] == ir_binop_mod
);
1673 ir_rvalue
*temp_rhs
;
1674 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1678 do_assignment(instructions
, state
,
1679 this->subexpressions
[0]->non_lvalue_description
,
1680 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1681 &result
, needs_rvalue
, false,
1682 this->subexpressions
[0]->get_location());
1687 case ast_rs_assign
: {
1688 this->subexpressions
[0]->set_is_lhs(true);
1689 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1690 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1691 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1693 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1694 type
, op
[0], op
[1]);
1696 do_assignment(instructions
, state
,
1697 this->subexpressions
[0]->non_lvalue_description
,
1698 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1699 &result
, needs_rvalue
, false,
1700 this->subexpressions
[0]->get_location());
1704 case ast_and_assign
:
1705 case ast_xor_assign
:
1706 case ast_or_assign
: {
1707 this->subexpressions
[0]->set_is_lhs(true);
1708 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1709 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1710 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1711 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1712 type
, op
[0], op
[1]);
1714 do_assignment(instructions
, state
,
1715 this->subexpressions
[0]->non_lvalue_description
,
1716 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1717 &result
, needs_rvalue
, false,
1718 this->subexpressions
[0]->get_location());
1722 case ast_conditional
: {
1723 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1725 * "The ternary selection operator (?:). It operates on three
1726 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1727 * first expression, which must result in a scalar Boolean."
1729 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1730 "condition", &error_emitted
);
1732 /* The :? operator is implemented by generating an anonymous temporary
1733 * followed by an if-statement. The last instruction in each branch of
1734 * the if-statement assigns a value to the anonymous temporary. This
1735 * temporary is the r-value of the expression.
1737 exec_list then_instructions
;
1738 exec_list else_instructions
;
1740 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1741 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1743 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1745 * "The second and third expressions can be any type, as
1746 * long their types match, or there is a conversion in
1747 * Section 4.1.10 "Implicit Conversions" that can be applied
1748 * to one of the expressions to make their types match. This
1749 * resulting matching type is the type of the entire
1752 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1753 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1754 || (op
[1]->type
!= op
[2]->type
)) {
1755 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1757 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1758 "operator must have matching types");
1759 error_emitted
= true;
1760 type
= glsl_type::error_type
;
1765 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1767 * "The second and third expressions must be the same type, but can
1768 * be of any type other than an array."
1770 if (type
->is_array() &&
1771 !state
->check_version(120, 300, &loc
,
1772 "second and third operands of ?: operator "
1773 "cannot be arrays")) {
1774 error_emitted
= true;
1777 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1779 * "Except for array indexing, structure member selection, and
1780 * parentheses, opaque variables are not allowed to be operands in
1781 * expressions; such use results in a compile-time error."
1783 if (type
->contains_opaque()) {
1784 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1785 "of the ?: operator");
1786 error_emitted
= true;
1789 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1791 if (then_instructions
.is_empty()
1792 && else_instructions
.is_empty()
1793 && cond_val
!= NULL
) {
1794 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1796 /* The copy to conditional_tmp reads the whole array. */
1797 if (type
->is_array()) {
1798 mark_whole_array_access(op
[1]);
1799 mark_whole_array_access(op
[2]);
1802 ir_variable
*const tmp
=
1803 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1804 instructions
->push_tail(tmp
);
1806 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1807 instructions
->push_tail(stmt
);
1809 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1810 ir_dereference
*const then_deref
=
1811 new(ctx
) ir_dereference_variable(tmp
);
1812 ir_assignment
*const then_assign
=
1813 new(ctx
) ir_assignment(then_deref
, op
[1]);
1814 stmt
->then_instructions
.push_tail(then_assign
);
1816 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1817 ir_dereference
*const else_deref
=
1818 new(ctx
) ir_dereference_variable(tmp
);
1819 ir_assignment
*const else_assign
=
1820 new(ctx
) ir_assignment(else_deref
, op
[2]);
1821 stmt
->else_instructions
.push_tail(else_assign
);
1823 result
= new(ctx
) ir_dereference_variable(tmp
);
1830 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1831 ? "pre-increment operation" : "pre-decrement operation";
1833 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1834 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1836 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1838 ir_rvalue
*temp_rhs
;
1839 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1843 do_assignment(instructions
, state
,
1844 this->subexpressions
[0]->non_lvalue_description
,
1845 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1846 &result
, needs_rvalue
, false,
1847 this->subexpressions
[0]->get_location());
1852 case ast_post_dec
: {
1853 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1854 ? "post-increment operation" : "post-decrement operation";
1855 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1856 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1858 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1860 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1862 ir_rvalue
*temp_rhs
;
1863 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1866 /* Get a temporary of a copy of the lvalue before it's modified.
1867 * This may get thrown away later.
1869 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1871 ir_rvalue
*junk_rvalue
;
1873 do_assignment(instructions
, state
,
1874 this->subexpressions
[0]->non_lvalue_description
,
1875 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1876 &junk_rvalue
, false, false,
1877 this->subexpressions
[0]->get_location());
1882 case ast_field_selection
:
1883 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1886 case ast_array_index
: {
1887 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1889 /* Getting if an array is being used uninitialized is beyond what we get
1890 * from ir_value.data.assigned. Setting is_lhs as true would force to
1891 * not raise a uninitialized warning when using an array
1893 subexpressions
[0]->set_is_lhs(true);
1894 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1895 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1897 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1900 if (result
->type
->is_error())
1901 error_emitted
= true;
1906 case ast_unsized_array_dim
:
1907 assert(!"ast_unsized_array_dim: Should never get here.");
1910 case ast_function_call
:
1911 /* Should *NEVER* get here. ast_function_call should always be handled
1912 * by ast_function_expression::hir.
1917 case ast_identifier
: {
1918 /* ast_identifier can appear several places in a full abstract syntax
1919 * tree. This particular use must be at location specified in the grammar
1920 * as 'variable_identifier'.
1923 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1926 /* the identifier might be a subroutine name */
1928 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
1929 var
= state
->symbols
->get_variable(sub_name
);
1930 ralloc_free(sub_name
);
1934 var
->data
.used
= true;
1935 result
= new(ctx
) ir_dereference_variable(var
);
1937 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
1939 && result
->variable_referenced()->data
.assigned
!= true
1940 && !is_gl_identifier(var
->name
)) {
1941 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
1942 this->primary_expression
.identifier
);
1945 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1946 this->primary_expression
.identifier
);
1948 result
= ir_rvalue::error_value(ctx
);
1949 error_emitted
= true;
1954 case ast_int_constant
:
1955 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1958 case ast_uint_constant
:
1959 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1962 case ast_float_constant
:
1963 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1966 case ast_bool_constant
:
1967 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1970 case ast_double_constant
:
1971 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1974 case ast_sequence
: {
1975 /* It should not be possible to generate a sequence in the AST without
1976 * any expressions in it.
1978 assert(!this->expressions
.is_empty());
1980 /* The r-value of a sequence is the last expression in the sequence. If
1981 * the other expressions in the sequence do not have side-effects (and
1982 * therefore add instructions to the instruction list), they get dropped
1985 exec_node
*previous_tail_pred
= NULL
;
1986 YYLTYPE previous_operand_loc
= loc
;
1988 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1989 /* If one of the operands of comma operator does not generate any
1990 * code, we want to emit a warning. At each pass through the loop
1991 * previous_tail_pred will point to the last instruction in the
1992 * stream *before* processing the previous operand. Naturally,
1993 * instructions->tail_pred will point to the last instruction in the
1994 * stream *after* processing the previous operand. If the two
1995 * pointers match, then the previous operand had no effect.
1997 * The warning behavior here differs slightly from GCC. GCC will
1998 * only emit a warning if none of the left-hand operands have an
1999 * effect. However, it will emit a warning for each. I believe that
2000 * there are some cases in C (especially with GCC extensions) where
2001 * it is useful to have an intermediate step in a sequence have no
2002 * effect, but I don't think these cases exist in GLSL. Either way,
2003 * it would be a giant hassle to replicate that behavior.
2005 if (previous_tail_pred
== instructions
->tail_pred
) {
2006 _mesa_glsl_warning(&previous_operand_loc
, state
,
2007 "left-hand operand of comma expression has "
2011 /* tail_pred is directly accessed instead of using the get_tail()
2012 * method for performance reasons. get_tail() has extra code to
2013 * return NULL when the list is empty. We don't care about that
2014 * here, so using tail_pred directly is fine.
2016 previous_tail_pred
= instructions
->tail_pred
;
2017 previous_operand_loc
= ast
->get_location();
2019 result
= ast
->hir(instructions
, state
);
2022 /* Any errors should have already been emitted in the loop above.
2024 error_emitted
= true;
2028 type
= NULL
; /* use result->type, not type. */
2029 assert(result
!= NULL
|| !needs_rvalue
);
2031 if (result
&& result
->type
->is_error() && !error_emitted
)
2032 _mesa_glsl_error(& loc
, state
, "type mismatch");
2038 ast_expression::has_sequence_subexpression() const
2040 switch (this->oper
) {
2049 return this->subexpressions
[0]->has_sequence_subexpression();
2071 case ast_array_index
:
2072 case ast_mul_assign
:
2073 case ast_div_assign
:
2074 case ast_add_assign
:
2075 case ast_sub_assign
:
2076 case ast_mod_assign
:
2079 case ast_and_assign
:
2080 case ast_xor_assign
:
2082 return this->subexpressions
[0]->has_sequence_subexpression() ||
2083 this->subexpressions
[1]->has_sequence_subexpression();
2085 case ast_conditional
:
2086 return this->subexpressions
[0]->has_sequence_subexpression() ||
2087 this->subexpressions
[1]->has_sequence_subexpression() ||
2088 this->subexpressions
[2]->has_sequence_subexpression();
2093 case ast_field_selection
:
2094 case ast_identifier
:
2095 case ast_int_constant
:
2096 case ast_uint_constant
:
2097 case ast_float_constant
:
2098 case ast_bool_constant
:
2099 case ast_double_constant
:
2103 unreachable("ast_aggregate: Should never get here.");
2105 case ast_function_call
:
2106 unreachable("should be handled by ast_function_expression::hir");
2108 case ast_unsized_array_dim
:
2109 unreachable("ast_unsized_array_dim: Should never get here.");
2116 ast_expression_statement::hir(exec_list
*instructions
,
2117 struct _mesa_glsl_parse_state
*state
)
2119 /* It is possible to have expression statements that don't have an
2120 * expression. This is the solitary semicolon:
2122 * for (i = 0; i < 5; i++)
2125 * In this case the expression will be NULL. Test for NULL and don't do
2126 * anything in that case.
2128 if (expression
!= NULL
)
2129 expression
->hir_no_rvalue(instructions
, state
);
2131 /* Statements do not have r-values.
2138 ast_compound_statement::hir(exec_list
*instructions
,
2139 struct _mesa_glsl_parse_state
*state
)
2142 state
->symbols
->push_scope();
2144 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2145 ast
->hir(instructions
, state
);
2148 state
->symbols
->pop_scope();
2150 /* Compound statements do not have r-values.
2156 * Evaluate the given exec_node (which should be an ast_node representing
2157 * a single array dimension) and return its integer value.
2160 process_array_size(exec_node
*node
,
2161 struct _mesa_glsl_parse_state
*state
)
2163 exec_list dummy_instructions
;
2165 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2168 * Dimensions other than the outermost dimension can by unsized if they
2169 * are immediately sized by a constructor or initializer.
2171 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2174 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2175 YYLTYPE loc
= array_size
->get_location();
2178 _mesa_glsl_error(& loc
, state
,
2179 "array size could not be resolved");
2183 if (!ir
->type
->is_integer()) {
2184 _mesa_glsl_error(& loc
, state
,
2185 "array size must be integer type");
2189 if (!ir
->type
->is_scalar()) {
2190 _mesa_glsl_error(& loc
, state
,
2191 "array size must be scalar type");
2195 ir_constant
*const size
= ir
->constant_expression_value();
2197 (state
->is_version(120, 300) &&
2198 array_size
->has_sequence_subexpression())) {
2199 _mesa_glsl_error(& loc
, state
, "array size must be a "
2200 "constant valued expression");
2204 if (size
->value
.i
[0] <= 0) {
2205 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2209 assert(size
->type
== ir
->type
);
2211 /* If the array size is const (and we've verified that
2212 * it is) then no instructions should have been emitted
2213 * when we converted it to HIR. If they were emitted,
2214 * then either the array size isn't const after all, or
2215 * we are emitting unnecessary instructions.
2217 assert(dummy_instructions
.is_empty());
2219 return size
->value
.u
[0];
2222 static const glsl_type
*
2223 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2224 ast_array_specifier
*array_specifier
,
2225 struct _mesa_glsl_parse_state
*state
)
2227 const glsl_type
*array_type
= base
;
2229 if (array_specifier
!= NULL
) {
2230 if (base
->is_array()) {
2232 /* From page 19 (page 25) of the GLSL 1.20 spec:
2234 * "Only one-dimensional arrays may be declared."
2236 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2237 return glsl_type::error_type
;
2241 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2242 !node
->is_head_sentinel(); node
= node
->prev
) {
2243 unsigned array_size
= process_array_size(node
, state
);
2244 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2252 precision_qualifier_allowed(const glsl_type
*type
)
2254 /* Precision qualifiers apply to floating point, integer and opaque
2257 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2258 * "Any floating point or any integer declaration can have the type
2259 * preceded by one of these precision qualifiers [...] Literal
2260 * constants do not have precision qualifiers. Neither do Boolean
2263 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2266 * "Precision qualifiers are added for code portability with OpenGL
2267 * ES, not for functionality. They have the same syntax as in OpenGL
2270 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2272 * "uniform lowp sampler2D sampler;
2275 * lowp vec4 col = texture2D (sampler, coord);
2276 * // texture2D returns lowp"
2278 * From this, we infer that GLSL 1.30 (and later) should allow precision
2279 * qualifiers on sampler types just like float and integer types.
2281 return (type
->is_float()
2282 || type
->is_integer()
2283 || type
->contains_opaque())
2284 && !type
->without_array()->is_record();
2288 ast_type_specifier::glsl_type(const char **name
,
2289 struct _mesa_glsl_parse_state
*state
) const
2291 const struct glsl_type
*type
;
2293 type
= state
->symbols
->get_type(this->type_name
);
2294 *name
= this->type_name
;
2296 YYLTYPE loc
= this->get_location();
2297 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2303 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2305 * "The precision statement
2307 * precision precision-qualifier type;
2309 * can be used to establish a default precision qualifier. The type field can
2310 * be either int or float or any of the sampler types, (...) If type is float,
2311 * the directive applies to non-precision-qualified floating point type
2312 * (scalar, vector, and matrix) declarations. If type is int, the directive
2313 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2314 * and unsigned) declarations."
2316 * We use the symbol table to keep the values of the default precisions for
2317 * each 'type' in each scope and we use the 'type' string from the precision
2318 * statement as key in the symbol table. When we want to retrieve the default
2319 * precision associated with a given glsl_type we need to know the type string
2320 * associated with it. This is what this function returns.
2323 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2325 switch (type
->base_type
) {
2326 case GLSL_TYPE_FLOAT
:
2328 case GLSL_TYPE_UINT
:
2331 case GLSL_TYPE_ATOMIC_UINT
:
2332 return "atomic_uint";
2333 case GLSL_TYPE_IMAGE
:
2335 case GLSL_TYPE_SAMPLER
: {
2336 const unsigned type_idx
=
2337 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2338 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2339 assert(type_idx
< 4);
2340 switch (type
->sampled_type
) {
2341 case GLSL_TYPE_FLOAT
:
2342 switch (type
->sampler_dimensionality
) {
2343 case GLSL_SAMPLER_DIM_1D
: {
2344 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2345 static const char *const names
[4] = {
2346 "sampler1D", "sampler1DArray",
2347 "sampler1DShadow", "sampler1DArrayShadow"
2349 return names
[type_idx
];
2351 case GLSL_SAMPLER_DIM_2D
: {
2352 static const char *const names
[8] = {
2353 "sampler2D", "sampler2DArray",
2354 "sampler2DShadow", "sampler2DArrayShadow",
2355 "image2D", "image2DArray", NULL
, NULL
2357 return names
[offset
+ type_idx
];
2359 case GLSL_SAMPLER_DIM_3D
: {
2360 static const char *const names
[8] = {
2361 "sampler3D", NULL
, NULL
, NULL
,
2362 "image3D", NULL
, NULL
, NULL
2364 return names
[offset
+ type_idx
];
2366 case GLSL_SAMPLER_DIM_CUBE
: {
2367 static const char *const names
[8] = {
2368 "samplerCube", "samplerCubeArray",
2369 "samplerCubeShadow", "samplerCubeArrayShadow",
2370 "imageCube", NULL
, NULL
, NULL
2372 return names
[offset
+ type_idx
];
2374 case GLSL_SAMPLER_DIM_MS
: {
2375 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2376 static const char *const names
[4] = {
2377 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2379 return names
[type_idx
];
2381 case GLSL_SAMPLER_DIM_RECT
: {
2382 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2383 static const char *const names
[4] = {
2384 "samplerRect", NULL
, "samplerRectShadow", NULL
2386 return names
[type_idx
];
2388 case GLSL_SAMPLER_DIM_BUF
: {
2389 static const char *const names
[8] = {
2390 "samplerBuffer", NULL
, NULL
, NULL
,
2391 "imageBuffer", NULL
, NULL
, NULL
2393 return names
[offset
+ type_idx
];
2395 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2396 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2397 static const char *const names
[4] = {
2398 "samplerExternalOES", NULL
, NULL
, NULL
2400 return names
[type_idx
];
2403 unreachable("Unsupported sampler/image dimensionality");
2404 } /* sampler/image float dimensionality */
2407 switch (type
->sampler_dimensionality
) {
2408 case GLSL_SAMPLER_DIM_1D
: {
2409 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2410 static const char *const names
[4] = {
2411 "isampler1D", "isampler1DArray", NULL
, NULL
2413 return names
[type_idx
];
2415 case GLSL_SAMPLER_DIM_2D
: {
2416 static const char *const names
[8] = {
2417 "isampler2D", "isampler2DArray", NULL
, NULL
,
2418 "iimage2D", "iimage2DArray", NULL
, NULL
2420 return names
[offset
+ type_idx
];
2422 case GLSL_SAMPLER_DIM_3D
: {
2423 static const char *const names
[8] = {
2424 "isampler3D", NULL
, NULL
, NULL
,
2425 "iimage3D", NULL
, NULL
, NULL
2427 return names
[offset
+ type_idx
];
2429 case GLSL_SAMPLER_DIM_CUBE
: {
2430 static const char *const names
[8] = {
2431 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2432 "iimageCube", NULL
, NULL
, NULL
2434 return names
[offset
+ type_idx
];
2436 case GLSL_SAMPLER_DIM_MS
: {
2437 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2438 static const char *const names
[4] = {
2439 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2441 return names
[type_idx
];
2443 case GLSL_SAMPLER_DIM_RECT
: {
2444 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2445 static const char *const names
[4] = {
2446 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2448 return names
[type_idx
];
2450 case GLSL_SAMPLER_DIM_BUF
: {
2451 static const char *const names
[8] = {
2452 "isamplerBuffer", NULL
, NULL
, NULL
,
2453 "iimageBuffer", NULL
, NULL
, NULL
2455 return names
[offset
+ type_idx
];
2458 unreachable("Unsupported isampler/iimage dimensionality");
2459 } /* sampler/image int dimensionality */
2461 case GLSL_TYPE_UINT
:
2462 switch (type
->sampler_dimensionality
) {
2463 case GLSL_SAMPLER_DIM_1D
: {
2464 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2465 static const char *const names
[4] = {
2466 "usampler1D", "usampler1DArray", NULL
, NULL
2468 return names
[type_idx
];
2470 case GLSL_SAMPLER_DIM_2D
: {
2471 static const char *const names
[8] = {
2472 "usampler2D", "usampler2DArray", NULL
, NULL
,
2473 "uimage2D", "uimage2DArray", NULL
, NULL
2475 return names
[offset
+ type_idx
];
2477 case GLSL_SAMPLER_DIM_3D
: {
2478 static const char *const names
[8] = {
2479 "usampler3D", NULL
, NULL
, NULL
,
2480 "uimage3D", NULL
, NULL
, NULL
2482 return names
[offset
+ type_idx
];
2484 case GLSL_SAMPLER_DIM_CUBE
: {
2485 static const char *const names
[8] = {
2486 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2487 "uimageCube", NULL
, NULL
, NULL
2489 return names
[offset
+ type_idx
];
2491 case GLSL_SAMPLER_DIM_MS
: {
2492 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2493 static const char *const names
[4] = {
2494 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2496 return names
[type_idx
];
2498 case GLSL_SAMPLER_DIM_RECT
: {
2499 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2500 static const char *const names
[4] = {
2501 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2503 return names
[type_idx
];
2505 case GLSL_SAMPLER_DIM_BUF
: {
2506 static const char *const names
[8] = {
2507 "usamplerBuffer", NULL
, NULL
, NULL
,
2508 "uimageBuffer", NULL
, NULL
, NULL
2510 return names
[offset
+ type_idx
];
2513 unreachable("Unsupported usampler/uimage dimensionality");
2514 } /* sampler/image uint dimensionality */
2517 unreachable("Unsupported sampler/image type");
2518 } /* sampler/image type */
2520 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2523 unreachable("Unsupported type");
2528 select_gles_precision(unsigned qual_precision
,
2529 const glsl_type
*type
,
2530 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2532 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2533 * In GLES we take the precision from the type qualifier if present,
2534 * otherwise, if the type of the variable allows precision qualifiers at
2535 * all, we look for the default precision qualifier for that type in the
2538 assert(state
->es_shader
);
2540 unsigned precision
= GLSL_PRECISION_NONE
;
2541 if (qual_precision
) {
2542 precision
= qual_precision
;
2543 } else if (precision_qualifier_allowed(type
)) {
2544 const char *type_name
=
2545 get_type_name_for_precision_qualifier(type
->without_array());
2546 assert(type_name
!= NULL
);
2549 state
->symbols
->get_default_precision_qualifier(type_name
);
2550 if (precision
== ast_precision_none
) {
2551 _mesa_glsl_error(loc
, state
,
2552 "No precision specified in this scope for type `%s'",
2560 ast_fully_specified_type::glsl_type(const char **name
,
2561 struct _mesa_glsl_parse_state
*state
) const
2563 return this->specifier
->glsl_type(name
, state
);
2567 * Determine whether a toplevel variable declaration declares a varying. This
2568 * function operates by examining the variable's mode and the shader target,
2569 * so it correctly identifies linkage variables regardless of whether they are
2570 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2572 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2573 * this function will produce undefined results.
2576 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2579 case MESA_SHADER_VERTEX
:
2580 return var
->data
.mode
== ir_var_shader_out
;
2581 case MESA_SHADER_FRAGMENT
:
2582 return var
->data
.mode
== ir_var_shader_in
;
2584 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2590 * Matrix layout qualifiers are only allowed on certain types
2593 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2595 const glsl_type
*type
,
2598 if (var
&& !var
->is_in_buffer_block()) {
2599 /* Layout qualifiers may only apply to interface blocks and fields in
2602 _mesa_glsl_error(loc
, state
,
2603 "uniform block layout qualifiers row_major and "
2604 "column_major may not be applied to variables "
2605 "outside of uniform blocks");
2606 } else if (!type
->without_array()->is_matrix()) {
2607 /* The OpenGL ES 3.0 conformance tests did not originally allow
2608 * matrix layout qualifiers on non-matrices. However, the OpenGL
2609 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2610 * amended to specifically allow these layouts on all types. Emit
2611 * a warning so that people know their code may not be portable.
2613 _mesa_glsl_warning(loc
, state
,
2614 "uniform block layout qualifiers row_major and "
2615 "column_major applied to non-matrix types may "
2616 "be rejected by older compilers");
2621 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2622 struct _mesa_glsl_parse_state
*state
,
2623 unsigned xfb_buffer
) {
2624 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2625 _mesa_glsl_error(loc
, state
,
2626 "invalid xfb_buffer specified %d is larger than "
2627 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2629 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2636 /* From the ARB_enhanced_layouts spec:
2638 * "Variables and block members qualified with *xfb_offset* can be
2639 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2640 * The offset must be a multiple of the size of the first component of
2641 * the first qualified variable or block member, or a compile-time error
2642 * results. Further, if applied to an aggregate containing a double,
2643 * the offset must also be a multiple of 8, and the space taken in the
2644 * buffer will be a multiple of 8.
2647 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2648 struct _mesa_glsl_parse_state
*state
,
2649 int xfb_offset
, const glsl_type
*type
,
2650 unsigned component_size
) {
2651 const glsl_type
*t_without_array
= type
->without_array();
2653 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2654 _mesa_glsl_error(loc
, state
,
2655 "xfb_offset can't be used with unsized arrays.");
2659 /* Make sure nested structs don't contain unsized arrays, and validate
2660 * any xfb_offsets on interface members.
2662 if (t_without_array
->is_record() || t_without_array
->is_interface())
2663 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2664 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2666 /* When the interface block doesn't have an xfb_offset qualifier then
2667 * we apply the component size rules at the member level.
2669 if (xfb_offset
== -1)
2670 component_size
= member_t
->contains_double() ? 8 : 4;
2672 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2673 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2677 /* Nested structs or interface block without offset may not have had an
2678 * offset applied yet so return.
2680 if (xfb_offset
== -1) {
2684 if (xfb_offset
% component_size
) {
2685 _mesa_glsl_error(loc
, state
,
2686 "invalid qualifier xfb_offset=%d must be a multiple "
2687 "of the first component size of the first qualified "
2688 "variable or block member. Or double if an aggregate "
2689 "that contains a double (%d).",
2690 xfb_offset
, component_size
);
2698 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2701 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2702 _mesa_glsl_error(loc
, state
,
2703 "invalid stream specified %d is larger than "
2704 "MAX_VERTEX_STREAMS - 1 (%d).",
2705 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2713 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2716 const glsl_type
*type
,
2717 const ast_type_qualifier
*qual
)
2719 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2720 _mesa_glsl_error(loc
, state
,
2721 "the \"binding\" qualifier only applies to uniforms and "
2722 "shader storage buffer objects");
2726 unsigned qual_binding
;
2727 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2732 const struct gl_context
*const ctx
= state
->ctx
;
2733 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2734 unsigned max_index
= qual_binding
+ elements
- 1;
2735 const glsl_type
*base_type
= type
->without_array();
2737 if (base_type
->is_interface()) {
2738 /* UBOs. From page 60 of the GLSL 4.20 specification:
2739 * "If the binding point for any uniform block instance is less than zero,
2740 * or greater than or equal to the implementation-dependent maximum
2741 * number of uniform buffer bindings, a compilation error will occur.
2742 * When the binding identifier is used with a uniform block instanced as
2743 * an array of size N, all elements of the array from binding through
2744 * binding + N – 1 must be within this range."
2746 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2748 if (qual
->flags
.q
.uniform
&&
2749 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2750 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2751 "the maximum number of UBO binding points (%d)",
2752 qual_binding
, elements
,
2753 ctx
->Const
.MaxUniformBufferBindings
);
2757 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2758 * "If the binding point for any uniform or shader storage block instance
2759 * is less than zero, or greater than or equal to the
2760 * implementation-dependent maximum number of uniform buffer bindings, a
2761 * compile-time error will occur. When the binding identifier is used
2762 * with a uniform or shader storage block instanced as an array of size
2763 * N, all elements of the array from binding through binding + N – 1 must
2764 * be within this range."
2766 if (qual
->flags
.q
.buffer
&&
2767 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2768 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2769 "the maximum number of SSBO binding points (%d)",
2770 qual_binding
, elements
,
2771 ctx
->Const
.MaxShaderStorageBufferBindings
);
2774 } else if (base_type
->is_sampler()) {
2775 /* Samplers. From page 63 of the GLSL 4.20 specification:
2776 * "If the binding is less than zero, or greater than or equal to the
2777 * implementation-dependent maximum supported number of units, a
2778 * compilation error will occur. When the binding identifier is used
2779 * with an array of size N, all elements of the array from binding
2780 * through binding + N - 1 must be within this range."
2782 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2784 if (max_index
>= limit
) {
2785 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2786 "exceeds the maximum number of texture image units "
2787 "(%u)", qual_binding
, elements
, limit
);
2791 } else if (base_type
->contains_atomic()) {
2792 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2793 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2794 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2795 " maximum number of atomic counter buffer bindings"
2796 "(%u)", qual_binding
,
2797 ctx
->Const
.MaxAtomicBufferBindings
);
2801 } else if ((state
->is_version(420, 310) ||
2802 state
->ARB_shading_language_420pack_enable
) &&
2803 base_type
->is_image()) {
2804 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2805 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2806 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2807 " maximum number of image units (%d)", max_index
,
2808 ctx
->Const
.MaxImageUnits
);
2813 _mesa_glsl_error(loc
, state
,
2814 "the \"binding\" qualifier only applies to uniform "
2815 "blocks, opaque variables, or arrays thereof");
2819 var
->data
.explicit_binding
= true;
2820 var
->data
.binding
= qual_binding
;
2827 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
2829 const glsl_interp_qualifier interpolation
,
2830 const struct ast_type_qualifier
*qual
,
2831 const struct glsl_type
*var_type
,
2832 ir_variable_mode mode
)
2834 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
2835 * not to vertex shader inputs nor fragment shader outputs.
2837 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2838 * "Outputs from a vertex shader (out) and inputs to a fragment
2839 * shader (in) can be further qualified with one or more of these
2840 * interpolation qualifiers"
2842 * "These interpolation qualifiers may only precede the qualifiers in,
2843 * centroid in, out, or centroid out in a declaration. They do not apply
2844 * to the deprecated storage qualifiers varying or centroid
2845 * varying. They also do not apply to inputs into a vertex shader or
2846 * outputs from a fragment shader."
2848 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
2849 * "Outputs from a shader (out) and inputs to a shader (in) can be
2850 * further qualified with one of these interpolation qualifiers."
2852 * "These interpolation qualifiers may only precede the qualifiers
2853 * in, centroid in, out, or centroid out in a declaration. They do
2854 * not apply to inputs into a vertex shader or outputs from a
2857 if (state
->is_version(130, 300)
2858 && interpolation
!= INTERP_QUALIFIER_NONE
) {
2859 const char *i
= interpolation_string(interpolation
);
2860 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
2861 _mesa_glsl_error(loc
, state
,
2862 "interpolation qualifier `%s' can only be applied to "
2863 "shader inputs or outputs.", i
);
2865 switch (state
->stage
) {
2866 case MESA_SHADER_VERTEX
:
2867 if (mode
== ir_var_shader_in
) {
2868 _mesa_glsl_error(loc
, state
,
2869 "interpolation qualifier '%s' cannot be applied to "
2870 "vertex shader inputs", i
);
2873 case MESA_SHADER_FRAGMENT
:
2874 if (mode
== ir_var_shader_out
) {
2875 _mesa_glsl_error(loc
, state
,
2876 "interpolation qualifier '%s' cannot be applied to "
2877 "fragment shader outputs", i
);
2885 /* Interpolation qualifiers cannot be applied to 'centroid' and
2886 * 'centroid varying'.
2888 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2889 * "interpolation qualifiers may only precede the qualifiers in,
2890 * centroid in, out, or centroid out in a declaration. They do not apply
2891 * to the deprecated storage qualifiers varying or centroid varying."
2893 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2895 if (state
->is_version(130, 0)
2896 && interpolation
!= INTERP_QUALIFIER_NONE
2897 && qual
->flags
.q
.varying
) {
2899 const char *i
= interpolation_string(interpolation
);
2901 if (qual
->flags
.q
.centroid
)
2902 s
= "centroid varying";
2906 _mesa_glsl_error(loc
, state
,
2907 "qualifier '%s' cannot be applied to the "
2908 "deprecated storage qualifier '%s'", i
, s
);
2911 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2912 * so must integer vertex outputs.
2914 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2915 * "Fragment shader inputs that are signed or unsigned integers or
2916 * integer vectors must be qualified with the interpolation qualifier
2919 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2920 * "Fragment shader inputs that are, or contain, signed or unsigned
2921 * integers or integer vectors must be qualified with the
2922 * interpolation qualifier flat."
2924 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2925 * "Vertex shader outputs that are, or contain, signed or unsigned
2926 * integers or integer vectors must be qualified with the
2927 * interpolation qualifier flat."
2929 * Note that prior to GLSL 1.50, this requirement applied to vertex
2930 * outputs rather than fragment inputs. That creates problems in the
2931 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2932 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2933 * apply the restriction to both vertex outputs and fragment inputs.
2935 * Note also that the desktop GLSL specs are missing the text "or
2936 * contain"; this is presumably an oversight, since there is no
2937 * reasonable way to interpolate a fragment shader input that contains
2938 * an integer. See Khronos bug #15671.
2940 if (state
->is_version(130, 300)
2941 && var_type
->contains_integer()
2942 && interpolation
!= INTERP_QUALIFIER_FLAT
2943 && ((state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_in
)
2944 || (state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_out
2945 && state
->es_shader
))) {
2946 const char *shader_var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
2947 "vertex output" : "fragment input";
2948 _mesa_glsl_error(loc
, state
, "if a %s is (or contains) "
2949 "an integer, then it must be qualified with 'flat'",
2953 /* Double fragment inputs must be qualified with 'flat'.
2955 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
2956 * "This extension does not support interpolation of double-precision
2957 * values; doubles used as fragment shader inputs must be qualified as
2960 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
2961 * "Fragment shader inputs that are signed or unsigned integers, integer
2962 * vectors, or any double-precision floating-point type must be
2963 * qualified with the interpolation qualifier flat."
2965 * Note that the GLSL specs are missing the text "or contain"; this is
2966 * presumably an oversight. See Khronos bug #15671.
2968 * The 'double' type does not exist in GLSL ES so far.
2970 if ((state
->ARB_gpu_shader_fp64_enable
2971 || state
->is_version(400, 0))
2972 && var_type
->contains_double()
2973 && interpolation
!= INTERP_QUALIFIER_FLAT
2974 && state
->stage
== MESA_SHADER_FRAGMENT
2975 && mode
== ir_var_shader_in
) {
2976 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
2977 "a double, then it must be qualified with 'flat'");
2981 static glsl_interp_qualifier
2982 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2983 const struct glsl_type
*var_type
,
2984 ir_variable_mode mode
,
2985 struct _mesa_glsl_parse_state
*state
,
2988 glsl_interp_qualifier interpolation
;
2989 if (qual
->flags
.q
.flat
)
2990 interpolation
= INTERP_QUALIFIER_FLAT
;
2991 else if (qual
->flags
.q
.noperspective
)
2992 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2993 else if (qual
->flags
.q
.smooth
)
2994 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2995 else if (state
->es_shader
&&
2996 ((mode
== ir_var_shader_in
&&
2997 state
->stage
!= MESA_SHADER_VERTEX
) ||
2998 (mode
== ir_var_shader_out
&&
2999 state
->stage
!= MESA_SHADER_FRAGMENT
)))
3000 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
3002 * "When no interpolation qualifier is present, smooth interpolation
3005 interpolation
= INTERP_QUALIFIER_SMOOTH
;
3007 interpolation
= INTERP_QUALIFIER_NONE
;
3009 validate_interpolation_qualifier(state
, loc
,
3011 qual
, var_type
, mode
);
3013 return interpolation
;
3018 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3020 struct _mesa_glsl_parse_state
*state
,
3025 unsigned qual_location
;
3026 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3031 /* Checks for GL_ARB_explicit_uniform_location. */
3032 if (qual
->flags
.q
.uniform
) {
3033 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3036 const struct gl_context
*const ctx
= state
->ctx
;
3037 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3039 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3040 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3041 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3042 ctx
->Const
.MaxUserAssignableUniformLocations
);
3046 var
->data
.explicit_location
= true;
3047 var
->data
.location
= qual_location
;
3051 /* Between GL_ARB_explicit_attrib_location an
3052 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3053 * stage can be assigned explicit locations. The checking here associates
3054 * the correct extension with the correct stage's input / output:
3058 * vertex explicit_loc sso
3059 * tess control sso sso
3062 * fragment sso explicit_loc
3064 switch (state
->stage
) {
3065 case MESA_SHADER_VERTEX
:
3066 if (var
->data
.mode
== ir_var_shader_in
) {
3067 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3073 if (var
->data
.mode
== ir_var_shader_out
) {
3074 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3083 case MESA_SHADER_TESS_CTRL
:
3084 case MESA_SHADER_TESS_EVAL
:
3085 case MESA_SHADER_GEOMETRY
:
3086 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3087 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3096 case MESA_SHADER_FRAGMENT
:
3097 if (var
->data
.mode
== ir_var_shader_in
) {
3098 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3104 if (var
->data
.mode
== ir_var_shader_out
) {
3105 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3114 case MESA_SHADER_COMPUTE
:
3115 _mesa_glsl_error(loc
, state
,
3116 "compute shader variables cannot be given "
3117 "explicit locations");
3122 _mesa_glsl_error(loc
, state
,
3123 "%s cannot be given an explicit location in %s shader",
3125 _mesa_shader_stage_to_string(state
->stage
));
3127 var
->data
.explicit_location
= true;
3129 switch (state
->stage
) {
3130 case MESA_SHADER_VERTEX
:
3131 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3132 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3133 : (qual_location
+ VARYING_SLOT_VAR0
);
3136 case MESA_SHADER_TESS_CTRL
:
3137 case MESA_SHADER_TESS_EVAL
:
3138 case MESA_SHADER_GEOMETRY
:
3139 if (var
->data
.patch
)
3140 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3142 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3145 case MESA_SHADER_FRAGMENT
:
3146 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3147 ? (qual_location
+ FRAG_RESULT_DATA0
)
3148 : (qual_location
+ VARYING_SLOT_VAR0
);
3150 case MESA_SHADER_COMPUTE
:
3151 assert(!"Unexpected shader type");
3155 /* Check if index was set for the uniform instead of the function */
3156 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
3157 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3158 "used with subroutine functions");
3162 unsigned qual_index
;
3163 if (qual
->flags
.q
.explicit_index
&&
3164 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3166 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3167 * Layout Qualifiers):
3169 * "It is also a compile-time error if a fragment shader
3170 * sets a layout index to less than 0 or greater than 1."
3172 * Older specifications don't mandate a behavior; we take
3173 * this as a clarification and always generate the error.
3175 if (qual_index
> 1) {
3176 _mesa_glsl_error(loc
, state
,
3177 "explicit index may only be 0 or 1");
3179 var
->data
.explicit_index
= true;
3180 var
->data
.index
= qual_index
;
3187 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3189 struct _mesa_glsl_parse_state
*state
,
3192 const glsl_type
*base_type
= var
->type
->without_array();
3194 if (base_type
->is_image()) {
3195 if (var
->data
.mode
!= ir_var_uniform
&&
3196 var
->data
.mode
!= ir_var_function_in
) {
3197 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3198 "function parameters or uniform-qualified "
3199 "global variables");
3202 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
3203 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
3204 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
3205 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
3206 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
3207 var
->data
.read_only
= true;
3209 if (qual
->flags
.q
.explicit_image_format
) {
3210 if (var
->data
.mode
== ir_var_function_in
) {
3211 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
3212 "used on image function parameters");
3215 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3216 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
3217 "base data type of the image");
3220 var
->data
.image_format
= qual
->image_format
;
3222 if (var
->data
.mode
== ir_var_uniform
) {
3223 if (state
->es_shader
) {
3224 _mesa_glsl_error(loc
, state
, "all image uniforms "
3225 "must have a format layout qualifier");
3227 } else if (!qual
->flags
.q
.write_only
) {
3228 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3229 "`writeonly' must have a format layout "
3234 var
->data
.image_format
= GL_NONE
;
3237 /* From page 70 of the GLSL ES 3.1 specification:
3239 * "Except for image variables qualified with the format qualifiers
3240 * r32f, r32i, and r32ui, image variables must specify either memory
3241 * qualifier readonly or the memory qualifier writeonly."
3243 if (state
->es_shader
&&
3244 var
->data
.image_format
!= GL_R32F
&&
3245 var
->data
.image_format
!= GL_R32I
&&
3246 var
->data
.image_format
!= GL_R32UI
&&
3247 !var
->data
.image_read_only
&&
3248 !var
->data
.image_write_only
) {
3249 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3250 "r32f, r32i or r32ui must be qualified `readonly' or "
3254 } else if (qual
->flags
.q
.read_only
||
3255 qual
->flags
.q
.write_only
||
3256 qual
->flags
.q
.coherent
||
3257 qual
->flags
.q
._volatile
||
3258 qual
->flags
.q
.restrict_flag
||
3259 qual
->flags
.q
.explicit_image_format
) {
3260 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3265 static inline const char*
3266 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3268 if (origin_upper_left
&& pixel_center_integer
)
3269 return "origin_upper_left, pixel_center_integer";
3270 else if (origin_upper_left
)
3271 return "origin_upper_left";
3272 else if (pixel_center_integer
)
3273 return "pixel_center_integer";
3279 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3280 const struct ast_type_qualifier
*qual
)
3282 /* If gl_FragCoord was previously declared, and the qualifiers were
3283 * different in any way, return true.
3285 if (state
->fs_redeclares_gl_fragcoord
) {
3286 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3287 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3294 validate_array_dimensions(const glsl_type
*t
,
3295 struct _mesa_glsl_parse_state
*state
,
3297 if (t
->is_array()) {
3298 t
= t
->fields
.array
;
3299 while (t
->is_array()) {
3300 if (t
->is_unsized_array()) {
3301 _mesa_glsl_error(loc
, state
,
3302 "only the outermost array dimension can "
3307 t
= t
->fields
.array
;
3313 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3315 struct _mesa_glsl_parse_state
*state
,
3318 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3320 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3322 * "Within any shader, the first redeclarations of gl_FragCoord
3323 * must appear before any use of gl_FragCoord."
3325 * Generate a compiler error if above condition is not met by the
3328 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3329 if (earlier
!= NULL
&&
3330 earlier
->data
.used
&&
3331 !state
->fs_redeclares_gl_fragcoord
) {
3332 _mesa_glsl_error(loc
, state
,
3333 "gl_FragCoord used before its first redeclaration "
3334 "in fragment shader");
3337 /* Make sure all gl_FragCoord redeclarations specify the same layout
3340 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3341 const char *const qual_string
=
3342 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3343 qual
->flags
.q
.pixel_center_integer
);
3345 const char *const state_string
=
3346 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3347 state
->fs_pixel_center_integer
);
3349 _mesa_glsl_error(loc
, state
,
3350 "gl_FragCoord redeclared with different layout "
3351 "qualifiers (%s) and (%s) ",
3355 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3356 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3357 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3358 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3359 state
->fs_redeclares_gl_fragcoord
=
3360 state
->fs_origin_upper_left
||
3361 state
->fs_pixel_center_integer
||
3362 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3365 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3366 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3367 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3368 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3369 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3370 ? "origin_upper_left" : "pixel_center_integer";
3372 _mesa_glsl_error(loc
, state
,
3373 "layout qualifier `%s' can only be applied to "
3374 "fragment shader input `gl_FragCoord'",
3378 if (qual
->flags
.q
.explicit_location
) {
3379 apply_explicit_location(qual
, var
, state
, loc
);
3381 if (qual
->flags
.q
.explicit_component
) {
3382 unsigned qual_component
;
3383 if (process_qualifier_constant(state
, loc
, "component",
3384 qual
->component
, &qual_component
)) {
3385 const glsl_type
*type
= var
->type
->without_array();
3386 unsigned components
= type
->component_slots();
3388 if (type
->is_matrix() || type
->is_record()) {
3389 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3390 "cannot be applied to a matrix, a structure, "
3391 "a block, or an array containing any of "
3393 } else if (qual_component
!= 0 &&
3394 (qual_component
+ components
- 1) > 3) {
3395 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3396 (qual_component
+ components
- 1));
3397 } else if (qual_component
== 1 && type
->is_double()) {
3398 /* We don't bother checking for 3 as it should be caught by the
3399 * overflow check above.
3401 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3402 "component 1 or 3");
3404 var
->data
.explicit_component
= true;
3405 var
->data
.location_frac
= qual_component
;
3409 } else if (qual
->flags
.q
.explicit_index
) {
3410 if (!qual
->flags
.q
.subroutine_def
)
3411 _mesa_glsl_error(loc
, state
,
3412 "explicit index requires explicit location");
3413 } else if (qual
->flags
.q
.explicit_component
) {
3414 _mesa_glsl_error(loc
, state
,
3415 "explicit component requires explicit location");
3418 if (qual
->flags
.q
.explicit_binding
) {
3419 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3422 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3423 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3424 unsigned qual_stream
;
3425 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3427 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3428 var
->data
.stream
= qual_stream
;
3432 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3433 unsigned qual_xfb_buffer
;
3434 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3435 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3436 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3437 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3438 if (qual
->flags
.q
.explicit_xfb_buffer
)
3439 var
->data
.explicit_xfb_buffer
= true;
3443 if (qual
->flags
.q
.explicit_xfb_offset
) {
3444 unsigned qual_xfb_offset
;
3445 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3447 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3448 qual
->offset
, &qual_xfb_offset
) &&
3449 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3450 var
->type
, component_size
)) {
3451 var
->data
.offset
= qual_xfb_offset
;
3452 var
->data
.explicit_xfb_offset
= true;
3456 if (qual
->flags
.q
.explicit_xfb_stride
) {
3457 unsigned qual_xfb_stride
;
3458 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3459 qual
->xfb_stride
, &qual_xfb_stride
)) {
3460 var
->data
.xfb_stride
= qual_xfb_stride
;
3461 var
->data
.explicit_xfb_stride
= true;
3465 if (var
->type
->contains_atomic()) {
3466 if (var
->data
.mode
== ir_var_uniform
) {
3467 if (var
->data
.explicit_binding
) {
3469 &state
->atomic_counter_offsets
[var
->data
.binding
];
3471 if (*offset
% ATOMIC_COUNTER_SIZE
)
3472 _mesa_glsl_error(loc
, state
,
3473 "misaligned atomic counter offset");
3475 var
->data
.offset
= *offset
;
3476 *offset
+= var
->type
->atomic_size();
3479 _mesa_glsl_error(loc
, state
,
3480 "atomic counters require explicit binding point");
3482 } else if (var
->data
.mode
!= ir_var_function_in
) {
3483 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3484 "function parameters or uniform-qualified "
3485 "global variables");
3489 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3490 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3491 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3492 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3493 * These extensions and all following extensions that add the 'layout'
3494 * keyword have been modified to require the use of 'in' or 'out'.
3496 * The following extension do not allow the deprecated keywords:
3498 * GL_AMD_conservative_depth
3499 * GL_ARB_conservative_depth
3500 * GL_ARB_gpu_shader5
3501 * GL_ARB_separate_shader_objects
3502 * GL_ARB_tessellation_shader
3503 * GL_ARB_transform_feedback3
3504 * GL_ARB_uniform_buffer_object
3506 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3507 * allow layout with the deprecated keywords.
3509 const bool relaxed_layout_qualifier_checking
=
3510 state
->ARB_fragment_coord_conventions_enable
;
3512 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3513 || qual
->flags
.q
.varying
;
3514 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3515 if (relaxed_layout_qualifier_checking
) {
3516 _mesa_glsl_warning(loc
, state
,
3517 "`layout' qualifier may not be used with "
3518 "`attribute' or `varying'");
3520 _mesa_glsl_error(loc
, state
,
3521 "`layout' qualifier may not be used with "
3522 "`attribute' or `varying'");
3526 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3527 * AMD_conservative_depth.
3529 int depth_layout_count
= qual
->flags
.q
.depth_any
3530 + qual
->flags
.q
.depth_greater
3531 + qual
->flags
.q
.depth_less
3532 + qual
->flags
.q
.depth_unchanged
;
3533 if (depth_layout_count
> 0
3534 && !state
->is_version(420, 0)
3535 && !state
->AMD_conservative_depth_enable
3536 && !state
->ARB_conservative_depth_enable
) {
3537 _mesa_glsl_error(loc
, state
,
3538 "extension GL_AMD_conservative_depth or "
3539 "GL_ARB_conservative_depth must be enabled "
3540 "to use depth layout qualifiers");
3541 } else if (depth_layout_count
> 0
3542 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3543 _mesa_glsl_error(loc
, state
,
3544 "depth layout qualifiers can be applied only to "
3546 } else if (depth_layout_count
> 1
3547 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3548 _mesa_glsl_error(loc
, state
,
3549 "at most one depth layout qualifier can be applied to "
3552 if (qual
->flags
.q
.depth_any
)
3553 var
->data
.depth_layout
= ir_depth_layout_any
;
3554 else if (qual
->flags
.q
.depth_greater
)
3555 var
->data
.depth_layout
= ir_depth_layout_greater
;
3556 else if (qual
->flags
.q
.depth_less
)
3557 var
->data
.depth_layout
= ir_depth_layout_less
;
3558 else if (qual
->flags
.q
.depth_unchanged
)
3559 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3561 var
->data
.depth_layout
= ir_depth_layout_none
;
3563 if (qual
->flags
.q
.std140
||
3564 qual
->flags
.q
.std430
||
3565 qual
->flags
.q
.packed
||
3566 qual
->flags
.q
.shared
) {
3567 _mesa_glsl_error(loc
, state
,
3568 "uniform and shader storage block layout qualifiers "
3569 "std140, std430, packed, and shared can only be "
3570 "applied to uniform or shader storage blocks, not "
3574 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3575 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3578 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3581 * "Fragment shaders also allow the following layout qualifier on in only
3582 * (not with variable declarations)
3583 * layout-qualifier-id
3584 * early_fragment_tests
3587 if (qual
->flags
.q
.early_fragment_tests
) {
3588 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3589 "valid in fragment shader input layout declaration.");
3594 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3596 struct _mesa_glsl_parse_state
*state
,
3600 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3602 if (qual
->flags
.q
.invariant
) {
3603 if (var
->data
.used
) {
3604 _mesa_glsl_error(loc
, state
,
3605 "variable `%s' may not be redeclared "
3606 "`invariant' after being used",
3609 var
->data
.invariant
= 1;
3613 if (qual
->flags
.q
.precise
) {
3614 if (var
->data
.used
) {
3615 _mesa_glsl_error(loc
, state
,
3616 "variable `%s' may not be redeclared "
3617 "`precise' after being used",
3620 var
->data
.precise
= 1;
3624 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3625 _mesa_glsl_error(loc
, state
,
3626 "`subroutine' may only be applied to uniforms, "
3627 "subroutine type declarations, or function definitions");
3630 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3631 || qual
->flags
.q
.uniform
3632 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3633 var
->data
.read_only
= 1;
3635 if (qual
->flags
.q
.centroid
)
3636 var
->data
.centroid
= 1;
3638 if (qual
->flags
.q
.sample
)
3639 var
->data
.sample
= 1;
3641 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3642 if (state
->es_shader
) {
3643 var
->data
.precision
=
3644 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3647 if (qual
->flags
.q
.patch
)
3648 var
->data
.patch
= 1;
3650 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3651 var
->type
= glsl_type::error_type
;
3652 _mesa_glsl_error(loc
, state
,
3653 "`attribute' variables may not be declared in the "
3655 _mesa_shader_stage_to_string(state
->stage
));
3658 /* Disallow layout qualifiers which may only appear on layout declarations. */
3659 if (qual
->flags
.q
.prim_type
) {
3660 _mesa_glsl_error(loc
, state
,
3661 "Primitive type may only be specified on GS input or output "
3662 "layout declaration, not on variables.");
3665 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3667 * "However, the const qualifier cannot be used with out or inout."
3669 * The same section of the GLSL 4.40 spec further clarifies this saying:
3671 * "The const qualifier cannot be used with out or inout, or a
3672 * compile-time error results."
3674 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3675 _mesa_glsl_error(loc
, state
,
3676 "`const' may not be applied to `out' or `inout' "
3677 "function parameters");
3680 /* If there is no qualifier that changes the mode of the variable, leave
3681 * the setting alone.
3683 assert(var
->data
.mode
!= ir_var_temporary
);
3684 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3685 var
->data
.mode
= ir_var_function_inout
;
3686 else if (qual
->flags
.q
.in
)
3687 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3688 else if (qual
->flags
.q
.attribute
3689 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3690 var
->data
.mode
= ir_var_shader_in
;
3691 else if (qual
->flags
.q
.out
)
3692 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3693 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3694 var
->data
.mode
= ir_var_shader_out
;
3695 else if (qual
->flags
.q
.uniform
)
3696 var
->data
.mode
= ir_var_uniform
;
3697 else if (qual
->flags
.q
.buffer
)
3698 var
->data
.mode
= ir_var_shader_storage
;
3699 else if (qual
->flags
.q
.shared_storage
)
3700 var
->data
.mode
= ir_var_shader_shared
;
3702 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3703 /* User-defined ins/outs are not permitted in compute shaders. */
3704 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3705 _mesa_glsl_error(loc
, state
,
3706 "user-defined input and output variables are not "
3707 "permitted in compute shaders");
3710 /* This variable is being used to link data between shader stages (in
3711 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3712 * that is allowed for such purposes.
3714 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3716 * "The varying qualifier can be used only with the data types
3717 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3720 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3721 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3723 * "Fragment inputs can only be signed and unsigned integers and
3724 * integer vectors, float, floating-point vectors, matrices, or
3725 * arrays of these. Structures cannot be input.
3727 * Similar text exists in the section on vertex shader outputs.
3729 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3730 * 3.00 spec allows structs as well. Varying structs are also allowed
3733 switch (var
->type
->get_scalar_type()->base_type
) {
3734 case GLSL_TYPE_FLOAT
:
3735 /* Ok in all GLSL versions */
3737 case GLSL_TYPE_UINT
:
3739 if (state
->is_version(130, 300))
3741 _mesa_glsl_error(loc
, state
,
3742 "varying variables must be of base type float in %s",
3743 state
->get_version_string());
3745 case GLSL_TYPE_STRUCT
:
3746 if (state
->is_version(150, 300))
3748 _mesa_glsl_error(loc
, state
,
3749 "varying variables may not be of type struct");
3751 case GLSL_TYPE_DOUBLE
:
3754 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3759 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3760 switch (state
->stage
) {
3761 case MESA_SHADER_VERTEX
:
3762 if (var
->data
.mode
== ir_var_shader_out
)
3763 var
->data
.invariant
= true;
3765 case MESA_SHADER_TESS_CTRL
:
3766 case MESA_SHADER_TESS_EVAL
:
3767 case MESA_SHADER_GEOMETRY
:
3768 if ((var
->data
.mode
== ir_var_shader_in
)
3769 || (var
->data
.mode
== ir_var_shader_out
))
3770 var
->data
.invariant
= true;
3772 case MESA_SHADER_FRAGMENT
:
3773 if (var
->data
.mode
== ir_var_shader_in
)
3774 var
->data
.invariant
= true;
3776 case MESA_SHADER_COMPUTE
:
3777 /* Invariance isn't meaningful in compute shaders. */
3782 var
->data
.interpolation
=
3783 interpret_interpolation_qualifier(qual
, var
->type
,
3784 (ir_variable_mode
) var
->data
.mode
,
3787 /* Does the declaration use the deprecated 'attribute' or 'varying'
3790 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3791 || qual
->flags
.q
.varying
;
3794 /* Validate auxiliary storage qualifiers */
3796 /* From section 4.3.4 of the GLSL 1.30 spec:
3797 * "It is an error to use centroid in in a vertex shader."
3799 * From section 4.3.4 of the GLSL ES 3.00 spec:
3800 * "It is an error to use centroid in or interpolation qualifiers in
3801 * a vertex shader input."
3804 /* Section 4.3.6 of the GLSL 1.30 specification states:
3805 * "It is an error to use centroid out in a fragment shader."
3807 * The GL_ARB_shading_language_420pack extension specification states:
3808 * "It is an error to use auxiliary storage qualifiers or interpolation
3809 * qualifiers on an output in a fragment shader."
3811 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3812 _mesa_glsl_error(loc
, state
,
3813 "sample qualifier may only be used on `in` or `out` "
3814 "variables between shader stages");
3816 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3817 _mesa_glsl_error(loc
, state
,
3818 "centroid qualifier may only be used with `in', "
3819 "`out' or `varying' variables between shader stages");
3822 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3823 _mesa_glsl_error(loc
, state
,
3824 "the shared storage qualifiers can only be used with "
3828 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3832 * Get the variable that is being redeclared by this declaration
3834 * Semantic checks to verify the validity of the redeclaration are also
3835 * performed. If semantic checks fail, compilation error will be emitted via
3836 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3839 * A pointer to an existing variable in the current scope if the declaration
3840 * is a redeclaration, \c NULL otherwise.
3842 static ir_variable
*
3843 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3844 struct _mesa_glsl_parse_state
*state
,
3845 bool allow_all_redeclarations
)
3847 /* Check if this declaration is actually a re-declaration, either to
3848 * resize an array or add qualifiers to an existing variable.
3850 * This is allowed for variables in the current scope, or when at
3851 * global scope (for built-ins in the implicit outer scope).
3853 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3854 if (earlier
== NULL
||
3855 (state
->current_function
!= NULL
&&
3856 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3861 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3863 * "It is legal to declare an array without a size and then
3864 * later re-declare the same name as an array of the same
3865 * type and specify a size."
3867 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3868 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3869 /* FINISHME: This doesn't match the qualifiers on the two
3870 * FINISHME: declarations. It's not 100% clear whether this is
3871 * FINISHME: required or not.
3874 const int size
= var
->type
->array_size();
3875 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3876 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3877 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3879 earlier
->data
.max_array_access
);
3882 earlier
->type
= var
->type
;
3885 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3886 state
->is_version(150, 0))
3887 && strcmp(var
->name
, "gl_FragCoord") == 0
3888 && earlier
->type
== var
->type
3889 && var
->data
.mode
== ir_var_shader_in
) {
3890 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3893 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3894 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3896 /* According to section 4.3.7 of the GLSL 1.30 spec,
3897 * the following built-in varaibles can be redeclared with an
3898 * interpolation qualifier:
3901 * * gl_FrontSecondaryColor
3902 * * gl_BackSecondaryColor
3904 * * gl_SecondaryColor
3906 } else if (state
->is_version(130, 0)
3907 && (strcmp(var
->name
, "gl_FrontColor") == 0
3908 || strcmp(var
->name
, "gl_BackColor") == 0
3909 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3910 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3911 || strcmp(var
->name
, "gl_Color") == 0
3912 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3913 && earlier
->type
== var
->type
3914 && earlier
->data
.mode
== var
->data
.mode
) {
3915 earlier
->data
.interpolation
= var
->data
.interpolation
;
3917 /* Layout qualifiers for gl_FragDepth. */
3918 } else if ((state
->is_version(420, 0) ||
3919 state
->AMD_conservative_depth_enable
||
3920 state
->ARB_conservative_depth_enable
)
3921 && strcmp(var
->name
, "gl_FragDepth") == 0
3922 && earlier
->type
== var
->type
3923 && earlier
->data
.mode
== var
->data
.mode
) {
3925 /** From the AMD_conservative_depth spec:
3926 * Within any shader, the first redeclarations of gl_FragDepth
3927 * must appear before any use of gl_FragDepth.
3929 if (earlier
->data
.used
) {
3930 _mesa_glsl_error(&loc
, state
,
3931 "the first redeclaration of gl_FragDepth "
3932 "must appear before any use of gl_FragDepth");
3935 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3936 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3937 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3938 _mesa_glsl_error(&loc
, state
,
3939 "gl_FragDepth: depth layout is declared here "
3940 "as '%s, but it was previously declared as "
3942 depth_layout_string(var
->data
.depth_layout
),
3943 depth_layout_string(earlier
->data
.depth_layout
));
3946 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3948 } else if (allow_all_redeclarations
) {
3949 if (earlier
->data
.mode
!= var
->data
.mode
) {
3950 _mesa_glsl_error(&loc
, state
,
3951 "redeclaration of `%s' with incorrect qualifiers",
3953 } else if (earlier
->type
!= var
->type
) {
3954 _mesa_glsl_error(&loc
, state
,
3955 "redeclaration of `%s' has incorrect type",
3959 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3966 * Generate the IR for an initializer in a variable declaration
3969 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3970 ast_fully_specified_type
*type
,
3971 exec_list
*initializer_instructions
,
3972 struct _mesa_glsl_parse_state
*state
)
3974 ir_rvalue
*result
= NULL
;
3976 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3978 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3980 * "All uniform variables are read-only and are initialized either
3981 * directly by an application via API commands, or indirectly by
3984 if (var
->data
.mode
== ir_var_uniform
) {
3985 state
->check_version(120, 0, &initializer_loc
,
3986 "cannot initialize uniform %s",
3990 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3992 * "Buffer variables cannot have initializers."
3994 if (var
->data
.mode
== ir_var_shader_storage
) {
3995 _mesa_glsl_error(&initializer_loc
, state
,
3996 "cannot initialize buffer variable %s",
4000 /* From section 4.1.7 of the GLSL 4.40 spec:
4002 * "Opaque variables [...] are initialized only through the
4003 * OpenGL API; they cannot be declared with an initializer in a
4006 if (var
->type
->contains_opaque()) {
4007 _mesa_glsl_error(&initializer_loc
, state
,
4008 "cannot initialize opaque variable %s",
4012 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4013 _mesa_glsl_error(&initializer_loc
, state
,
4014 "cannot initialize %s shader input / %s %s",
4015 _mesa_shader_stage_to_string(state
->stage
),
4016 (state
->stage
== MESA_SHADER_VERTEX
)
4017 ? "attribute" : "varying",
4021 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4022 _mesa_glsl_error(&initializer_loc
, state
,
4023 "cannot initialize %s shader output %s",
4024 _mesa_shader_stage_to_string(state
->stage
),
4028 /* If the initializer is an ast_aggregate_initializer, recursively store
4029 * type information from the LHS into it, so that its hir() function can do
4032 if (decl
->initializer
->oper
== ast_aggregate
)
4033 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4035 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4036 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4038 /* Calculate the constant value if this is a const or uniform
4041 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4043 * "Declarations of globals without a storage qualifier, or with
4044 * just the const qualifier, may include initializers, in which case
4045 * they will be initialized before the first line of main() is
4046 * executed. Such initializers must be a constant expression."
4048 * The same section of the GLSL ES 3.00.4 spec has similar language.
4050 if (type
->qualifier
.flags
.q
.constant
4051 || type
->qualifier
.flags
.q
.uniform
4052 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4053 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4055 if (new_rhs
!= NULL
) {
4058 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4061 * "A constant expression is one of
4065 * - an expression formed by an operator on operands that are
4066 * all constant expressions, including getting an element of
4067 * a constant array, or a field of a constant structure, or
4068 * components of a constant vector. However, the sequence
4069 * operator ( , ) and the assignment operators ( =, +=, ...)
4070 * are not included in the operators that can create a
4071 * constant expression."
4073 * Section 12.43 (Sequence operator and constant expressions) says:
4075 * "Should the following construct be allowed?
4079 * The expression within the brackets uses the sequence operator
4080 * (',') and returns the integer 3 so the construct is declaring
4081 * a single-dimensional array of size 3. In some languages, the
4082 * construct declares a two-dimensional array. It would be
4083 * preferable to make this construct illegal to avoid confusion.
4085 * One possibility is to change the definition of the sequence
4086 * operator so that it does not return a constant-expression and
4087 * hence cannot be used to declare an array size.
4089 * RESOLUTION: The result of a sequence operator is not a
4090 * constant-expression."
4092 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4093 * contains language almost identical to the section 4.3.3 in the
4094 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4097 ir_constant
*constant_value
= rhs
->constant_expression_value();
4098 if (!constant_value
||
4099 (state
->is_version(430, 300) &&
4100 decl
->initializer
->has_sequence_subexpression())) {
4101 const char *const variable_mode
=
4102 (type
->qualifier
.flags
.q
.constant
)
4104 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4106 /* If ARB_shading_language_420pack is enabled, initializers of
4107 * const-qualified local variables do not have to be constant
4108 * expressions. Const-qualified global variables must still be
4109 * initialized with constant expressions.
4111 if (!state
->has_420pack()
4112 || state
->current_function
== NULL
) {
4113 _mesa_glsl_error(& initializer_loc
, state
,
4114 "initializer of %s variable `%s' must be a "
4115 "constant expression",
4118 if (var
->type
->is_numeric()) {
4119 /* Reduce cascading errors. */
4120 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4121 ? ir_constant::zero(state
, var
->type
) : NULL
;
4125 rhs
= constant_value
;
4126 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4127 ? constant_value
: NULL
;
4130 if (var
->type
->is_numeric()) {
4131 /* Reduce cascading errors. */
4132 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4133 ? ir_constant::zero(state
, var
->type
) : NULL
;
4138 if (rhs
&& !rhs
->type
->is_error()) {
4139 bool temp
= var
->data
.read_only
;
4140 if (type
->qualifier
.flags
.q
.constant
)
4141 var
->data
.read_only
= false;
4143 /* Never emit code to initialize a uniform.
4145 const glsl_type
*initializer_type
;
4146 if (!type
->qualifier
.flags
.q
.uniform
) {
4147 do_assignment(initializer_instructions
, state
,
4152 type
->get_location());
4153 initializer_type
= result
->type
;
4155 initializer_type
= rhs
->type
;
4157 var
->constant_initializer
= rhs
->constant_expression_value();
4158 var
->data
.has_initializer
= true;
4160 /* If the declared variable is an unsized array, it must inherrit
4161 * its full type from the initializer. A declaration such as
4163 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4167 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4169 * The assignment generated in the if-statement (below) will also
4170 * automatically handle this case for non-uniforms.
4172 * If the declared variable is not an array, the types must
4173 * already match exactly. As a result, the type assignment
4174 * here can be done unconditionally. For non-uniforms the call
4175 * to do_assignment can change the type of the initializer (via
4176 * the implicit conversion rules). For uniforms the initializer
4177 * must be a constant expression, and the type of that expression
4178 * was validated above.
4180 var
->type
= initializer_type
;
4182 var
->data
.read_only
= temp
;
4189 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4190 YYLTYPE loc
, ir_variable
*var
,
4191 unsigned num_vertices
,
4193 const char *var_category
)
4195 if (var
->type
->is_unsized_array()) {
4196 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4198 * All geometry shader input unsized array declarations will be
4199 * sized by an earlier input layout qualifier, when present, as per
4200 * the following table.
4202 * Followed by a table mapping each allowed input layout qualifier to
4203 * the corresponding input length.
4205 * Similarly for tessellation control shader outputs.
4207 if (num_vertices
!= 0)
4208 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4211 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4212 * includes the following examples of compile-time errors:
4214 * // code sequence within one shader...
4215 * in vec4 Color1[]; // size unknown
4216 * ...Color1.length()...// illegal, length() unknown
4217 * in vec4 Color2[2]; // size is 2
4218 * ...Color1.length()...// illegal, Color1 still has no size
4219 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4220 * layout(lines) in; // legal, input size is 2, matching
4221 * in vec4 Color4[3]; // illegal, contradicts layout
4224 * To detect the case illustrated by Color3, we verify that the size of
4225 * an explicitly-sized array matches the size of any previously declared
4226 * explicitly-sized array. To detect the case illustrated by Color4, we
4227 * verify that the size of an explicitly-sized array is consistent with
4228 * any previously declared input layout.
4230 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4231 _mesa_glsl_error(&loc
, state
,
4232 "%s size contradicts previously declared layout "
4233 "(size is %u, but layout requires a size of %u)",
4234 var_category
, var
->type
->length
, num_vertices
);
4235 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4236 _mesa_glsl_error(&loc
, state
,
4237 "%s sizes are inconsistent (size is %u, but a "
4238 "previous declaration has size %u)",
4239 var_category
, var
->type
->length
, *size
);
4241 *size
= var
->type
->length
;
4247 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4248 YYLTYPE loc
, ir_variable
*var
)
4250 unsigned num_vertices
= 0;
4252 if (state
->tcs_output_vertices_specified
) {
4253 if (!state
->out_qualifier
->vertices
->
4254 process_qualifier_constant(state
, "vertices",
4255 &num_vertices
, false)) {
4259 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4260 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4261 "GL_MAX_PATCH_VERTICES", num_vertices
);
4266 if (!var
->type
->is_array() && !var
->data
.patch
) {
4267 _mesa_glsl_error(&loc
, state
,
4268 "tessellation control shader outputs must be arrays");
4270 /* To avoid cascading failures, short circuit the checks below. */
4274 if (var
->data
.patch
)
4277 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4278 &state
->tcs_output_size
,
4279 "tessellation control shader output");
4283 * Do additional processing necessary for tessellation control/evaluation shader
4284 * input declarations. This covers both interface block arrays and bare input
4288 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4289 YYLTYPE loc
, ir_variable
*var
)
4291 if (!var
->type
->is_array() && !var
->data
.patch
) {
4292 _mesa_glsl_error(&loc
, state
,
4293 "per-vertex tessellation shader inputs must be arrays");
4294 /* Avoid cascading failures. */
4298 if (var
->data
.patch
)
4301 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
4302 if (var
->type
->is_unsized_array()) {
4303 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4304 state
->Const
.MaxPatchVertices
);
4310 * Do additional processing necessary for geometry shader input declarations
4311 * (this covers both interface blocks arrays and bare input variables).
4314 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4315 YYLTYPE loc
, ir_variable
*var
)
4317 unsigned num_vertices
= 0;
4319 if (state
->gs_input_prim_type_specified
) {
4320 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4323 /* Geometry shader input variables must be arrays. Caller should have
4324 * reported an error for this.
4326 if (!var
->type
->is_array()) {
4327 assert(state
->error
);
4329 /* To avoid cascading failures, short circuit the checks below. */
4333 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4334 &state
->gs_input_size
,
4335 "geometry shader input");
4339 validate_identifier(const char *identifier
, YYLTYPE loc
,
4340 struct _mesa_glsl_parse_state
*state
)
4342 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4344 * "Identifiers starting with "gl_" are reserved for use by
4345 * OpenGL, and may not be declared in a shader as either a
4346 * variable or a function."
4348 if (is_gl_identifier(identifier
)) {
4349 _mesa_glsl_error(&loc
, state
,
4350 "identifier `%s' uses reserved `gl_' prefix",
4352 } else if (strstr(identifier
, "__")) {
4353 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4356 * "In addition, all identifiers containing two
4357 * consecutive underscores (__) are reserved as
4358 * possible future keywords."
4360 * The intention is that names containing __ are reserved for internal
4361 * use by the implementation, and names prefixed with GL_ are reserved
4362 * for use by Khronos. Names simply containing __ are dangerous to use,
4363 * but should be allowed.
4365 * A future version of the GLSL specification will clarify this.
4367 _mesa_glsl_warning(&loc
, state
,
4368 "identifier `%s' uses reserved `__' string",
4374 ast_declarator_list::hir(exec_list
*instructions
,
4375 struct _mesa_glsl_parse_state
*state
)
4378 const struct glsl_type
*decl_type
;
4379 const char *type_name
= NULL
;
4380 ir_rvalue
*result
= NULL
;
4381 YYLTYPE loc
= this->get_location();
4383 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4385 * "To ensure that a particular output variable is invariant, it is
4386 * necessary to use the invariant qualifier. It can either be used to
4387 * qualify a previously declared variable as being invariant
4389 * invariant gl_Position; // make existing gl_Position be invariant"
4391 * In these cases the parser will set the 'invariant' flag in the declarator
4392 * list, and the type will be NULL.
4394 if (this->invariant
) {
4395 assert(this->type
== NULL
);
4397 if (state
->current_function
!= NULL
) {
4398 _mesa_glsl_error(& loc
, state
,
4399 "all uses of `invariant' keyword must be at global "
4403 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4404 assert(decl
->array_specifier
== NULL
);
4405 assert(decl
->initializer
== NULL
);
4407 ir_variable
*const earlier
=
4408 state
->symbols
->get_variable(decl
->identifier
);
4409 if (earlier
== NULL
) {
4410 _mesa_glsl_error(& loc
, state
,
4411 "undeclared variable `%s' cannot be marked "
4412 "invariant", decl
->identifier
);
4413 } else if (!is_varying_var(earlier
, state
->stage
)) {
4414 _mesa_glsl_error(&loc
, state
,
4415 "`%s' cannot be marked invariant; interfaces between "
4416 "shader stages only.", decl
->identifier
);
4417 } else if (earlier
->data
.used
) {
4418 _mesa_glsl_error(& loc
, state
,
4419 "variable `%s' may not be redeclared "
4420 "`invariant' after being used",
4423 earlier
->data
.invariant
= true;
4427 /* Invariant redeclarations do not have r-values.
4432 if (this->precise
) {
4433 assert(this->type
== NULL
);
4435 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4436 assert(decl
->array_specifier
== NULL
);
4437 assert(decl
->initializer
== NULL
);
4439 ir_variable
*const earlier
=
4440 state
->symbols
->get_variable(decl
->identifier
);
4441 if (earlier
== NULL
) {
4442 _mesa_glsl_error(& loc
, state
,
4443 "undeclared variable `%s' cannot be marked "
4444 "precise", decl
->identifier
);
4445 } else if (state
->current_function
!= NULL
&&
4446 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4447 /* Note: we have to check if we're in a function, since
4448 * builtins are treated as having come from another scope.
4450 _mesa_glsl_error(& loc
, state
,
4451 "variable `%s' from an outer scope may not be "
4452 "redeclared `precise' in this scope",
4454 } else if (earlier
->data
.used
) {
4455 _mesa_glsl_error(& loc
, state
,
4456 "variable `%s' may not be redeclared "
4457 "`precise' after being used",
4460 earlier
->data
.precise
= true;
4464 /* Precise redeclarations do not have r-values either. */
4468 assert(this->type
!= NULL
);
4469 assert(!this->invariant
);
4470 assert(!this->precise
);
4472 /* The type specifier may contain a structure definition. Process that
4473 * before any of the variable declarations.
4475 (void) this->type
->specifier
->hir(instructions
, state
);
4477 decl_type
= this->type
->glsl_type(& type_name
, state
);
4479 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4480 * "Buffer variables may only be declared inside interface blocks
4481 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4482 * shader storage blocks. It is a compile-time error to declare buffer
4483 * variables at global scope (outside a block)."
4485 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4486 _mesa_glsl_error(&loc
, state
,
4487 "buffer variables cannot be declared outside "
4488 "interface blocks");
4491 /* An offset-qualified atomic counter declaration sets the default
4492 * offset for the next declaration within the same atomic counter
4495 if (decl_type
&& decl_type
->contains_atomic()) {
4496 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4497 type
->qualifier
.flags
.q
.explicit_offset
) {
4498 unsigned qual_binding
;
4499 unsigned qual_offset
;
4500 if (process_qualifier_constant(state
, &loc
, "binding",
4501 type
->qualifier
.binding
,
4503 && process_qualifier_constant(state
, &loc
, "offset",
4504 type
->qualifier
.offset
,
4506 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4510 ast_type_qualifier allowed_atomic_qual_mask
;
4511 allowed_atomic_qual_mask
.flags
.i
= 0;
4512 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4513 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4514 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4516 type
->qualifier
.validate_flags(&loc
, state
,
4517 "invalid layout qualifier for "
4519 allowed_atomic_qual_mask
);
4522 if (this->declarations
.is_empty()) {
4523 /* If there is no structure involved in the program text, there are two
4524 * possible scenarios:
4526 * - The program text contained something like 'vec4;'. This is an
4527 * empty declaration. It is valid but weird. Emit a warning.
4529 * - The program text contained something like 'S;' and 'S' is not the
4530 * name of a known structure type. This is both invalid and weird.
4533 * - The program text contained something like 'mediump float;'
4534 * when the programmer probably meant 'precision mediump
4535 * float;' Emit a warning with a description of what they
4536 * probably meant to do.
4538 * Note that if decl_type is NULL and there is a structure involved,
4539 * there must have been some sort of error with the structure. In this
4540 * case we assume that an error was already generated on this line of
4541 * code for the structure. There is no need to generate an additional,
4544 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4547 if (decl_type
== NULL
) {
4548 _mesa_glsl_error(&loc
, state
,
4549 "invalid type `%s' in empty declaration",
4552 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4553 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4556 * "... any declaration that leaves the size undefined is
4557 * disallowed as this would add complexity and there are no
4560 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4561 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4562 "or implicitly defined");
4565 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4567 * "The combinations of types and qualifiers that cause
4568 * compile-time or link-time errors are the same whether or not
4569 * the declaration is empty."
4571 validate_array_dimensions(decl_type
, state
, &loc
);
4574 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4575 /* Empty atomic counter declarations are allowed and useful
4576 * to set the default offset qualifier.
4579 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4580 if (this->type
->specifier
->structure
!= NULL
) {
4581 _mesa_glsl_error(&loc
, state
,
4582 "precision qualifiers can't be applied "
4585 static const char *const precision_names
[] = {
4592 _mesa_glsl_warning(&loc
, state
,
4593 "empty declaration with precision "
4594 "qualifier, to set the default precision, "
4595 "use `precision %s %s;'",
4596 precision_names
[this->type
->
4597 qualifier
.precision
],
4600 } else if (this->type
->specifier
->structure
== NULL
) {
4601 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4606 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4607 const struct glsl_type
*var_type
;
4609 const char *identifier
= decl
->identifier
;
4610 /* FINISHME: Emit a warning if a variable declaration shadows a
4611 * FINISHME: declaration at a higher scope.
4614 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4615 if (type_name
!= NULL
) {
4616 _mesa_glsl_error(& loc
, state
,
4617 "invalid type `%s' in declaration of `%s'",
4618 type_name
, decl
->identifier
);
4620 _mesa_glsl_error(& loc
, state
,
4621 "invalid type in declaration of `%s'",
4627 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4631 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4633 _mesa_glsl_error(& loc
, state
,
4634 "invalid type in declaration of `%s'",
4636 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4641 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4644 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4646 /* The 'varying in' and 'varying out' qualifiers can only be used with
4647 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4650 if (this->type
->qualifier
.flags
.q
.varying
) {
4651 if (this->type
->qualifier
.flags
.q
.in
) {
4652 _mesa_glsl_error(& loc
, state
,
4653 "`varying in' qualifier in declaration of "
4654 "`%s' only valid for geometry shaders using "
4655 "ARB_geometry_shader4 or EXT_geometry_shader4",
4657 } else if (this->type
->qualifier
.flags
.q
.out
) {
4658 _mesa_glsl_error(& loc
, state
,
4659 "`varying out' qualifier in declaration of "
4660 "`%s' only valid for geometry shaders using "
4661 "ARB_geometry_shader4 or EXT_geometry_shader4",
4666 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4668 * "Global variables can only use the qualifiers const,
4669 * attribute, uniform, or varying. Only one may be
4672 * Local variables can only use the qualifier const."
4674 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4675 * any extension that adds the 'layout' keyword.
4677 if (!state
->is_version(130, 300)
4678 && !state
->has_explicit_attrib_location()
4679 && !state
->has_separate_shader_objects()
4680 && !state
->ARB_fragment_coord_conventions_enable
) {
4681 if (this->type
->qualifier
.flags
.q
.out
) {
4682 _mesa_glsl_error(& loc
, state
,
4683 "`out' qualifier in declaration of `%s' "
4684 "only valid for function parameters in %s",
4685 decl
->identifier
, state
->get_version_string());
4687 if (this->type
->qualifier
.flags
.q
.in
) {
4688 _mesa_glsl_error(& loc
, state
,
4689 "`in' qualifier in declaration of `%s' "
4690 "only valid for function parameters in %s",
4691 decl
->identifier
, state
->get_version_string());
4693 /* FINISHME: Test for other invalid qualifiers. */
4696 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4698 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4701 if (this->type
->qualifier
.flags
.q
.invariant
) {
4702 if (!is_varying_var(var
, state
->stage
)) {
4703 _mesa_glsl_error(&loc
, state
,
4704 "`%s' cannot be marked invariant; interfaces between "
4705 "shader stages only", var
->name
);
4709 if (state
->current_function
!= NULL
) {
4710 const char *mode
= NULL
;
4711 const char *extra
= "";
4713 /* There is no need to check for 'inout' here because the parser will
4714 * only allow that in function parameter lists.
4716 if (this->type
->qualifier
.flags
.q
.attribute
) {
4718 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4719 mode
= "subroutine uniform";
4720 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4722 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4724 } else if (this->type
->qualifier
.flags
.q
.in
) {
4726 extra
= " or in function parameter list";
4727 } else if (this->type
->qualifier
.flags
.q
.out
) {
4729 extra
= " or in function parameter list";
4733 _mesa_glsl_error(& loc
, state
,
4734 "%s variable `%s' must be declared at "
4736 mode
, var
->name
, extra
);
4738 } else if (var
->data
.mode
== ir_var_shader_in
) {
4739 var
->data
.read_only
= true;
4741 if (state
->stage
== MESA_SHADER_VERTEX
) {
4742 bool error_emitted
= false;
4744 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4746 * "Vertex shader inputs can only be float, floating-point
4747 * vectors, matrices, signed and unsigned integers and integer
4748 * vectors. Vertex shader inputs can also form arrays of these
4749 * types, but not structures."
4751 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4753 * "Vertex shader inputs can only be float, floating-point
4754 * vectors, matrices, signed and unsigned integers and integer
4755 * vectors. They cannot be arrays or structures."
4757 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4759 * "The attribute qualifier can be used only with float,
4760 * floating-point vectors, and matrices. Attribute variables
4761 * cannot be declared as arrays or structures."
4763 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4765 * "Vertex shader inputs can only be float, floating-point
4766 * vectors, matrices, signed and unsigned integers and integer
4767 * vectors. Vertex shader inputs cannot be arrays or
4770 const glsl_type
*check_type
= var
->type
->without_array();
4772 switch (check_type
->base_type
) {
4773 case GLSL_TYPE_FLOAT
:
4775 case GLSL_TYPE_UINT
:
4777 if (state
->is_version(120, 300))
4779 case GLSL_TYPE_DOUBLE
:
4780 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4784 _mesa_glsl_error(& loc
, state
,
4785 "vertex shader input / attribute cannot have "
4787 var
->type
->is_array() ? "array of " : "",
4789 error_emitted
= true;
4792 if (!error_emitted
&& var
->type
->is_array() &&
4793 !state
->check_version(150, 0, &loc
,
4794 "vertex shader input / attribute "
4795 "cannot have array type")) {
4796 error_emitted
= true;
4798 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4799 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4801 * Geometry shader input variables get the per-vertex values
4802 * written out by vertex shader output variables of the same
4803 * names. Since a geometry shader operates on a set of
4804 * vertices, each input varying variable (or input block, see
4805 * interface blocks below) needs to be declared as an array.
4807 if (!var
->type
->is_array()) {
4808 _mesa_glsl_error(&loc
, state
,
4809 "geometry shader inputs must be arrays");
4812 handle_geometry_shader_input_decl(state
, loc
, var
);
4813 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4814 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4816 * It is a compile-time error to declare a fragment shader
4817 * input with, or that contains, any of the following types:
4821 * * An array of arrays
4822 * * An array of structures
4823 * * A structure containing an array
4824 * * A structure containing a structure
4826 if (state
->es_shader
) {
4827 const glsl_type
*check_type
= var
->type
->without_array();
4828 if (check_type
->is_boolean() ||
4829 check_type
->contains_opaque()) {
4830 _mesa_glsl_error(&loc
, state
,
4831 "fragment shader input cannot have type %s",
4834 if (var
->type
->is_array() &&
4835 var
->type
->fields
.array
->is_array()) {
4836 _mesa_glsl_error(&loc
, state
,
4838 "cannot have an array of arrays",
4839 _mesa_shader_stage_to_string(state
->stage
));
4841 if (var
->type
->is_array() &&
4842 var
->type
->fields
.array
->is_record()) {
4843 _mesa_glsl_error(&loc
, state
,
4844 "fragment shader input "
4845 "cannot have an array of structs");
4847 if (var
->type
->is_record()) {
4848 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4849 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4850 var
->type
->fields
.structure
[i
].type
->is_record())
4851 _mesa_glsl_error(&loc
, state
,
4852 "fragement shader input cannot have "
4853 "a struct that contains an "
4858 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4859 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4860 handle_tess_shader_input_decl(state
, loc
, var
);
4862 } else if (var
->data
.mode
== ir_var_shader_out
) {
4863 const glsl_type
*check_type
= var
->type
->without_array();
4865 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4867 * It is a compile-time error to declare a vertex, tessellation
4868 * evaluation, tessellation control, or geometry shader output
4869 * that contains any of the following:
4871 * * A Boolean type (bool, bvec2 ...)
4874 if (check_type
->is_boolean() || check_type
->contains_opaque())
4875 _mesa_glsl_error(&loc
, state
,
4876 "%s shader output cannot have type %s",
4877 _mesa_shader_stage_to_string(state
->stage
),
4880 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4882 * It is a compile-time error to declare a fragment shader output
4883 * that contains any of the following:
4885 * * A Boolean type (bool, bvec2 ...)
4886 * * A double-precision scalar or vector (double, dvec2 ...)
4891 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4892 if (check_type
->is_record() || check_type
->is_matrix())
4893 _mesa_glsl_error(&loc
, state
,
4894 "fragment shader output "
4895 "cannot have struct or matrix type");
4896 switch (check_type
->base_type
) {
4897 case GLSL_TYPE_UINT
:
4899 case GLSL_TYPE_FLOAT
:
4902 _mesa_glsl_error(&loc
, state
,
4903 "fragment shader output cannot have "
4904 "type %s", check_type
->name
);
4908 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4910 * It is a compile-time error to declare a vertex shader output
4911 * with, or that contains, any of the following types:
4915 * * An array of arrays
4916 * * An array of structures
4917 * * A structure containing an array
4918 * * A structure containing a structure
4920 * It is a compile-time error to declare a fragment shader output
4921 * with, or that contains, any of the following types:
4927 * * An array of array
4929 if (state
->es_shader
) {
4930 if (var
->type
->is_array() &&
4931 var
->type
->fields
.array
->is_array()) {
4932 _mesa_glsl_error(&loc
, state
,
4934 "cannot have an array of arrays",
4935 _mesa_shader_stage_to_string(state
->stage
));
4937 if (state
->stage
== MESA_SHADER_VERTEX
) {
4938 if (var
->type
->is_array() &&
4939 var
->type
->fields
.array
->is_record()) {
4940 _mesa_glsl_error(&loc
, state
,
4941 "vertex shader output "
4942 "cannot have an array of structs");
4944 if (var
->type
->is_record()) {
4945 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4946 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4947 var
->type
->fields
.structure
[i
].type
->is_record())
4948 _mesa_glsl_error(&loc
, state
,
4949 "vertex shader output cannot have a "
4950 "struct that contains an "
4957 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4958 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4960 } else if (var
->type
->contains_subroutine()) {
4961 /* declare subroutine uniforms as hidden */
4962 var
->data
.how_declared
= ir_var_hidden
;
4965 /* From section 4.3.4 of the GLSL 4.00 spec:
4966 * "Input variables may not be declared using the patch in qualifier
4967 * in tessellation control or geometry shaders."
4969 * From section 4.3.6 of the GLSL 4.00 spec:
4970 * "It is an error to use patch out in a vertex, tessellation
4971 * evaluation, or geometry shader."
4973 * This doesn't explicitly forbid using them in a fragment shader, but
4974 * that's probably just an oversight.
4976 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4977 && this->type
->qualifier
.flags
.q
.patch
4978 && this->type
->qualifier
.flags
.q
.in
) {
4980 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4981 "tessellation evaluation shader");
4984 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4985 && this->type
->qualifier
.flags
.q
.patch
4986 && this->type
->qualifier
.flags
.q
.out
) {
4988 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4989 "tessellation control shader");
4992 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4994 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4995 state
->check_precision_qualifiers_allowed(&loc
);
4999 /* If a precision qualifier is allowed on a type, it is allowed on
5000 * an array of that type.
5002 if (!(this->type
->qualifier
.precision
== ast_precision_none
5003 || precision_qualifier_allowed(var
->type
->without_array()))) {
5005 _mesa_glsl_error(&loc
, state
,
5006 "precision qualifiers apply only to floating point"
5007 ", integer and opaque types");
5010 /* From section 4.1.7 of the GLSL 4.40 spec:
5012 * "[Opaque types] can only be declared as function
5013 * parameters or uniform-qualified variables."
5015 if (var_type
->contains_opaque() &&
5016 !this->type
->qualifier
.flags
.q
.uniform
) {
5017 _mesa_glsl_error(&loc
, state
,
5018 "opaque variables must be declared uniform");
5021 /* Process the initializer and add its instructions to a temporary
5022 * list. This list will be added to the instruction stream (below) after
5023 * the declaration is added. This is done because in some cases (such as
5024 * redeclarations) the declaration may not actually be added to the
5025 * instruction stream.
5027 exec_list initializer_instructions
;
5029 /* Examine var name here since var may get deleted in the next call */
5030 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5032 ir_variable
*earlier
=
5033 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5034 false /* allow_all_redeclarations */);
5035 if (earlier
!= NULL
) {
5037 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
5038 _mesa_glsl_error(&loc
, state
,
5039 "`%s' has already been redeclared using "
5040 "gl_PerVertex", earlier
->name
);
5042 earlier
->data
.how_declared
= ir_var_declared_normally
;
5045 if (decl
->initializer
!= NULL
) {
5046 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
5048 &initializer_instructions
, state
);
5050 validate_array_dimensions(var_type
, state
, &loc
);
5053 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5055 * "It is an error to write to a const variable outside of
5056 * its declaration, so they must be initialized when
5059 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5060 _mesa_glsl_error(& loc
, state
,
5061 "const declaration of `%s' must be initialized",
5065 if (state
->es_shader
) {
5066 const glsl_type
*const t
= (earlier
== NULL
)
5067 ? var
->type
: earlier
->type
;
5069 if (t
->is_unsized_array())
5070 /* Section 10.17 of the GLSL ES 1.00 specification states that
5071 * unsized array declarations have been removed from the language.
5072 * Arrays that are sized using an initializer are still explicitly
5073 * sized. However, GLSL ES 1.00 does not allow array
5074 * initializers. That is only allowed in GLSL ES 3.00.
5076 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5078 * "An array type can also be formed without specifying a size
5079 * if the definition includes an initializer:
5081 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5082 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5087 _mesa_glsl_error(& loc
, state
,
5088 "unsized array declarations are not allowed in "
5092 /* If the declaration is not a redeclaration, there are a few additional
5093 * semantic checks that must be applied. In addition, variable that was
5094 * created for the declaration should be added to the IR stream.
5096 if (earlier
== NULL
) {
5097 validate_identifier(decl
->identifier
, loc
, state
);
5099 /* Add the variable to the symbol table. Note that the initializer's
5100 * IR was already processed earlier (though it hasn't been emitted
5101 * yet), without the variable in scope.
5103 * This differs from most C-like languages, but it follows the GLSL
5104 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5107 * "Within a declaration, the scope of a name starts immediately
5108 * after the initializer if present or immediately after the name
5109 * being declared if not."
5111 if (!state
->symbols
->add_variable(var
)) {
5112 YYLTYPE loc
= this->get_location();
5113 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5114 "current scope", decl
->identifier
);
5118 /* Push the variable declaration to the top. It means that all the
5119 * variable declarations will appear in a funny last-to-first order,
5120 * but otherwise we run into trouble if a function is prototyped, a
5121 * global var is decled, then the function is defined with usage of
5122 * the global var. See glslparsertest's CorrectModule.frag.
5124 instructions
->push_head(var
);
5127 instructions
->append_list(&initializer_instructions
);
5131 /* Generally, variable declarations do not have r-values. However,
5132 * one is used for the declaration in
5134 * while (bool b = some_condition()) {
5138 * so we return the rvalue from the last seen declaration here.
5145 ast_parameter_declarator::hir(exec_list
*instructions
,
5146 struct _mesa_glsl_parse_state
*state
)
5149 const struct glsl_type
*type
;
5150 const char *name
= NULL
;
5151 YYLTYPE loc
= this->get_location();
5153 type
= this->type
->glsl_type(& name
, state
);
5157 _mesa_glsl_error(& loc
, state
,
5158 "invalid type `%s' in declaration of `%s'",
5159 name
, this->identifier
);
5161 _mesa_glsl_error(& loc
, state
,
5162 "invalid type in declaration of `%s'",
5166 type
= glsl_type::error_type
;
5169 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5171 * "Functions that accept no input arguments need not use void in the
5172 * argument list because prototypes (or definitions) are required and
5173 * therefore there is no ambiguity when an empty argument list "( )" is
5174 * declared. The idiom "(void)" as a parameter list is provided for
5177 * Placing this check here prevents a void parameter being set up
5178 * for a function, which avoids tripping up checks for main taking
5179 * parameters and lookups of an unnamed symbol.
5181 if (type
->is_void()) {
5182 if (this->identifier
!= NULL
)
5183 _mesa_glsl_error(& loc
, state
,
5184 "named parameter cannot have type `void'");
5190 if (formal_parameter
&& (this->identifier
== NULL
)) {
5191 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5195 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5196 * call already handled the "vec4[..] foo" case.
5198 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5200 if (!type
->is_error() && type
->is_unsized_array()) {
5201 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5203 type
= glsl_type::error_type
;
5207 ir_variable
*var
= new(ctx
)
5208 ir_variable(type
, this->identifier
, ir_var_function_in
);
5210 /* Apply any specified qualifiers to the parameter declaration. Note that
5211 * for function parameters the default mode is 'in'.
5213 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5216 /* From section 4.1.7 of the GLSL 4.40 spec:
5218 * "Opaque variables cannot be treated as l-values; hence cannot
5219 * be used as out or inout function parameters, nor can they be
5222 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5223 && type
->contains_opaque()) {
5224 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5225 "contain opaque variables");
5226 type
= glsl_type::error_type
;
5229 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5231 * "When calling a function, expressions that do not evaluate to
5232 * l-values cannot be passed to parameters declared as out or inout."
5234 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5236 * "Other binary or unary expressions, non-dereferenced arrays,
5237 * function names, swizzles with repeated fields, and constants
5238 * cannot be l-values."
5240 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5241 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5243 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5245 && !state
->check_version(120, 100, &loc
,
5246 "arrays cannot be out or inout parameters")) {
5247 type
= glsl_type::error_type
;
5250 instructions
->push_tail(var
);
5252 /* Parameter declarations do not have r-values.
5259 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5261 exec_list
*ir_parameters
,
5262 _mesa_glsl_parse_state
*state
)
5264 ast_parameter_declarator
*void_param
= NULL
;
5267 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5268 param
->formal_parameter
= formal
;
5269 param
->hir(ir_parameters
, state
);
5277 if ((void_param
!= NULL
) && (count
> 1)) {
5278 YYLTYPE loc
= void_param
->get_location();
5280 _mesa_glsl_error(& loc
, state
,
5281 "`void' parameter must be only parameter");
5287 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5289 /* IR invariants disallow function declarations or definitions
5290 * nested within other function definitions. But there is no
5291 * requirement about the relative order of function declarations
5292 * and definitions with respect to one another. So simply insert
5293 * the new ir_function block at the end of the toplevel instruction
5296 state
->toplevel_ir
->push_tail(f
);
5301 ast_function::hir(exec_list
*instructions
,
5302 struct _mesa_glsl_parse_state
*state
)
5305 ir_function
*f
= NULL
;
5306 ir_function_signature
*sig
= NULL
;
5307 exec_list hir_parameters
;
5308 YYLTYPE loc
= this->get_location();
5310 const char *const name
= identifier
;
5312 /* New functions are always added to the top-level IR instruction stream,
5313 * so this instruction list pointer is ignored. See also emit_function
5316 (void) instructions
;
5318 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5320 * "Function declarations (prototypes) cannot occur inside of functions;
5321 * they must be at global scope, or for the built-in functions, outside
5322 * the global scope."
5324 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5326 * "User defined functions may only be defined within the global scope."
5328 * Note that this language does not appear in GLSL 1.10.
5330 if ((state
->current_function
!= NULL
) &&
5331 state
->is_version(120, 100)) {
5332 YYLTYPE loc
= this->get_location();
5333 _mesa_glsl_error(&loc
, state
,
5334 "declaration of function `%s' not allowed within "
5335 "function body", name
);
5338 validate_identifier(name
, this->get_location(), state
);
5340 /* Convert the list of function parameters to HIR now so that they can be
5341 * used below to compare this function's signature with previously seen
5342 * signatures for functions with the same name.
5344 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5346 & hir_parameters
, state
);
5348 const char *return_type_name
;
5349 const glsl_type
*return_type
=
5350 this->return_type
->glsl_type(& return_type_name
, state
);
5353 YYLTYPE loc
= this->get_location();
5354 _mesa_glsl_error(&loc
, state
,
5355 "function `%s' has undeclared return type `%s'",
5356 name
, return_type_name
);
5357 return_type
= glsl_type::error_type
;
5360 /* ARB_shader_subroutine states:
5361 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5362 * subroutine(...) to a function declaration."
5364 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5365 YYLTYPE loc
= this->get_location();
5366 _mesa_glsl_error(&loc
, state
,
5367 "function declaration `%s' cannot have subroutine prepended",
5371 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5372 * "No qualifier is allowed on the return type of a function."
5374 if (this->return_type
->has_qualifiers(state
)) {
5375 YYLTYPE loc
= this->get_location();
5376 _mesa_glsl_error(& loc
, state
,
5377 "function `%s' return type has qualifiers", name
);
5380 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5382 * "Arrays are allowed as arguments and as the return type. In both
5383 * cases, the array must be explicitly sized."
5385 if (return_type
->is_unsized_array()) {
5386 YYLTYPE loc
= this->get_location();
5387 _mesa_glsl_error(& loc
, state
,
5388 "function `%s' return type array must be explicitly "
5392 /* From section 4.1.7 of the GLSL 4.40 spec:
5394 * "[Opaque types] can only be declared as function parameters
5395 * or uniform-qualified variables."
5397 if (return_type
->contains_opaque()) {
5398 YYLTYPE loc
= this->get_location();
5399 _mesa_glsl_error(&loc
, state
,
5400 "function `%s' return type can't contain an opaque type",
5404 /* Create an ir_function if one doesn't already exist. */
5405 f
= state
->symbols
->get_function(name
);
5407 f
= new(ctx
) ir_function(name
);
5408 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5409 if (!state
->symbols
->add_function(f
)) {
5410 /* This function name shadows a non-function use of the same name. */
5411 YYLTYPE loc
= this->get_location();
5412 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5413 "non-function", name
);
5417 emit_function(state
, f
);
5420 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5422 * "A shader cannot redefine or overload built-in functions."
5424 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5426 * "User code can overload the built-in functions but cannot redefine
5429 if (state
->es_shader
&& state
->language_version
>= 300) {
5430 /* Local shader has no exact candidates; check the built-ins. */
5431 _mesa_glsl_initialize_builtin_functions();
5432 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5433 YYLTYPE loc
= this->get_location();
5434 _mesa_glsl_error(& loc
, state
,
5435 "A shader cannot redefine or overload built-in "
5436 "function `%s' in GLSL ES 3.00", name
);
5441 /* Verify that this function's signature either doesn't match a previously
5442 * seen signature for a function with the same name, or, if a match is found,
5443 * that the previously seen signature does not have an associated definition.
5445 if (state
->es_shader
|| f
->has_user_signature()) {
5446 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5448 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5449 if (badvar
!= NULL
) {
5450 YYLTYPE loc
= this->get_location();
5452 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5453 "qualifiers don't match prototype", name
, badvar
);
5456 if (sig
->return_type
!= return_type
) {
5457 YYLTYPE loc
= this->get_location();
5459 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5460 "match prototype", name
);
5463 if (sig
->is_defined
) {
5464 if (is_definition
) {
5465 YYLTYPE loc
= this->get_location();
5466 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5468 /* We just encountered a prototype that exactly matches a
5469 * function that's already been defined. This is redundant,
5470 * and we should ignore it.
5478 /* Verify the return type of main() */
5479 if (strcmp(name
, "main") == 0) {
5480 if (! return_type
->is_void()) {
5481 YYLTYPE loc
= this->get_location();
5483 _mesa_glsl_error(& loc
, state
, "main() must return void");
5486 if (!hir_parameters
.is_empty()) {
5487 YYLTYPE loc
= this->get_location();
5489 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5493 /* Finish storing the information about this new function in its signature.
5496 sig
= new(ctx
) ir_function_signature(return_type
);
5497 f
->add_signature(sig
);
5500 sig
->replace_parameters(&hir_parameters
);
5503 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5506 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5507 unsigned qual_index
;
5508 if (process_qualifier_constant(state
, &loc
, "index",
5509 this->return_type
->qualifier
.index
,
5511 if (!state
->has_explicit_uniform_location()) {
5512 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5513 "GL_ARB_explicit_uniform_location or "
5515 } else if (qual_index
>= MAX_SUBROUTINES
) {
5516 _mesa_glsl_error(&loc
, state
,
5517 "invalid subroutine index (%d) index must "
5518 "be a number between 0 and "
5519 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5520 MAX_SUBROUTINES
- 1);
5522 f
->subroutine_index
= qual_index
;
5527 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5528 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5529 f
->num_subroutine_types
);
5531 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5532 const struct glsl_type
*type
;
5533 /* the subroutine type must be already declared */
5534 type
= state
->symbols
->get_type(decl
->identifier
);
5536 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5539 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5540 ir_function
*fn
= state
->subroutine_types
[i
];
5541 ir_function_signature
*tsig
= NULL
;
5543 if (strcmp(fn
->name
, decl
->identifier
))
5546 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5549 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5551 if (tsig
->return_type
!= sig
->return_type
) {
5552 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5556 f
->subroutine_types
[idx
++] = type
;
5558 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5560 state
->num_subroutines
+ 1);
5561 state
->subroutines
[state
->num_subroutines
] = f
;
5562 state
->num_subroutines
++;
5566 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5567 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5568 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5571 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5573 state
->num_subroutine_types
+ 1);
5574 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5575 state
->num_subroutine_types
++;
5577 f
->is_subroutine
= true;
5580 /* Function declarations (prototypes) do not have r-values.
5587 ast_function_definition::hir(exec_list
*instructions
,
5588 struct _mesa_glsl_parse_state
*state
)
5590 prototype
->is_definition
= true;
5591 prototype
->hir(instructions
, state
);
5593 ir_function_signature
*signature
= prototype
->signature
;
5594 if (signature
== NULL
)
5597 assert(state
->current_function
== NULL
);
5598 state
->current_function
= signature
;
5599 state
->found_return
= false;
5601 /* Duplicate parameters declared in the prototype as concrete variables.
5602 * Add these to the symbol table.
5604 state
->symbols
->push_scope();
5605 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5606 assert(var
->as_variable() != NULL
);
5608 /* The only way a parameter would "exist" is if two parameters have
5611 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5612 YYLTYPE loc
= this->get_location();
5614 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5616 state
->symbols
->add_variable(var
);
5620 /* Convert the body of the function to HIR. */
5621 this->body
->hir(&signature
->body
, state
);
5622 signature
->is_defined
= true;
5624 state
->symbols
->pop_scope();
5626 assert(state
->current_function
== signature
);
5627 state
->current_function
= NULL
;
5629 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5630 YYLTYPE loc
= this->get_location();
5631 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5632 "%s, but no return statement",
5633 signature
->function_name(),
5634 signature
->return_type
->name
);
5637 /* Function definitions do not have r-values.
5644 ast_jump_statement::hir(exec_list
*instructions
,
5645 struct _mesa_glsl_parse_state
*state
)
5652 assert(state
->current_function
);
5654 if (opt_return_value
) {
5655 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5657 /* The value of the return type can be NULL if the shader says
5658 * 'return foo();' and foo() is a function that returns void.
5660 * NOTE: The GLSL spec doesn't say that this is an error. The type
5661 * of the return value is void. If the return type of the function is
5662 * also void, then this should compile without error. Seriously.
5664 const glsl_type
*const ret_type
=
5665 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5667 /* Implicit conversions are not allowed for return values prior to
5668 * ARB_shading_language_420pack.
5670 if (state
->current_function
->return_type
!= ret_type
) {
5671 YYLTYPE loc
= this->get_location();
5673 if (state
->has_420pack()) {
5674 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5676 _mesa_glsl_error(& loc
, state
,
5677 "could not implicitly convert return value "
5678 "to %s, in function `%s'",
5679 state
->current_function
->return_type
->name
,
5680 state
->current_function
->function_name());
5683 _mesa_glsl_error(& loc
, state
,
5684 "`return' with wrong type %s, in function `%s' "
5687 state
->current_function
->function_name(),
5688 state
->current_function
->return_type
->name
);
5690 } else if (state
->current_function
->return_type
->base_type
==
5692 YYLTYPE loc
= this->get_location();
5694 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5695 * specs add a clarification:
5697 * "A void function can only use return without a return argument, even if
5698 * the return argument has void type. Return statements only accept values:
5701 * void func2() { return func1(); } // illegal return statement"
5703 _mesa_glsl_error(& loc
, state
,
5704 "void functions can only use `return' without a "
5708 inst
= new(ctx
) ir_return(ret
);
5710 if (state
->current_function
->return_type
->base_type
!=
5712 YYLTYPE loc
= this->get_location();
5714 _mesa_glsl_error(& loc
, state
,
5715 "`return' with no value, in function %s returning "
5717 state
->current_function
->function_name());
5719 inst
= new(ctx
) ir_return
;
5722 state
->found_return
= true;
5723 instructions
->push_tail(inst
);
5728 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5729 YYLTYPE loc
= this->get_location();
5731 _mesa_glsl_error(& loc
, state
,
5732 "`discard' may only appear in a fragment shader");
5734 instructions
->push_tail(new(ctx
) ir_discard
);
5739 if (mode
== ast_continue
&&
5740 state
->loop_nesting_ast
== NULL
) {
5741 YYLTYPE loc
= this->get_location();
5743 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5744 } else if (mode
== ast_break
&&
5745 state
->loop_nesting_ast
== NULL
&&
5746 state
->switch_state
.switch_nesting_ast
== NULL
) {
5747 YYLTYPE loc
= this->get_location();
5749 _mesa_glsl_error(& loc
, state
,
5750 "break may only appear in a loop or a switch");
5752 /* For a loop, inline the for loop expression again, since we don't
5753 * know where near the end of the loop body the normal copy of it is
5754 * going to be placed. Same goes for the condition for a do-while
5757 if (state
->loop_nesting_ast
!= NULL
&&
5758 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5759 if (state
->loop_nesting_ast
->rest_expression
) {
5760 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5763 if (state
->loop_nesting_ast
->mode
==
5764 ast_iteration_statement::ast_do_while
) {
5765 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5769 if (state
->switch_state
.is_switch_innermost
&&
5770 mode
== ast_continue
) {
5771 /* Set 'continue_inside' to true. */
5772 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5773 ir_dereference_variable
*deref_continue_inside_var
=
5774 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5775 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5778 /* Break out from the switch, continue for the loop will
5779 * be called right after switch. */
5780 ir_loop_jump
*const jump
=
5781 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5782 instructions
->push_tail(jump
);
5784 } else if (state
->switch_state
.is_switch_innermost
&&
5785 mode
== ast_break
) {
5786 /* Force break out of switch by inserting a break. */
5787 ir_loop_jump
*const jump
=
5788 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5789 instructions
->push_tail(jump
);
5791 ir_loop_jump
*const jump
=
5792 new(ctx
) ir_loop_jump((mode
== ast_break
)
5793 ? ir_loop_jump::jump_break
5794 : ir_loop_jump::jump_continue
);
5795 instructions
->push_tail(jump
);
5802 /* Jump instructions do not have r-values.
5809 ast_selection_statement::hir(exec_list
*instructions
,
5810 struct _mesa_glsl_parse_state
*state
)
5814 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5816 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5818 * "Any expression whose type evaluates to a Boolean can be used as the
5819 * conditional expression bool-expression. Vector types are not accepted
5820 * as the expression to if."
5822 * The checks are separated so that higher quality diagnostics can be
5823 * generated for cases where both rules are violated.
5825 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5826 YYLTYPE loc
= this->condition
->get_location();
5828 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5832 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5834 if (then_statement
!= NULL
) {
5835 state
->symbols
->push_scope();
5836 then_statement
->hir(& stmt
->then_instructions
, state
);
5837 state
->symbols
->pop_scope();
5840 if (else_statement
!= NULL
) {
5841 state
->symbols
->push_scope();
5842 else_statement
->hir(& stmt
->else_instructions
, state
);
5843 state
->symbols
->pop_scope();
5846 instructions
->push_tail(stmt
);
5848 /* if-statements do not have r-values.
5855 ast_switch_statement::hir(exec_list
*instructions
,
5856 struct _mesa_glsl_parse_state
*state
)
5860 ir_rvalue
*const test_expression
=
5861 this->test_expression
->hir(instructions
, state
);
5863 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5865 * "The type of init-expression in a switch statement must be a
5868 if (!test_expression
->type
->is_scalar() ||
5869 !test_expression
->type
->is_integer()) {
5870 YYLTYPE loc
= this->test_expression
->get_location();
5872 _mesa_glsl_error(& loc
,
5874 "switch-statement expression must be scalar "
5878 /* Track the switch-statement nesting in a stack-like manner.
5880 struct glsl_switch_state saved
= state
->switch_state
;
5882 state
->switch_state
.is_switch_innermost
= true;
5883 state
->switch_state
.switch_nesting_ast
= this;
5884 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5885 hash_table_pointer_compare
);
5886 state
->switch_state
.previous_default
= NULL
;
5888 /* Initalize is_fallthru state to false.
5890 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5891 state
->switch_state
.is_fallthru_var
=
5892 new(ctx
) ir_variable(glsl_type::bool_type
,
5893 "switch_is_fallthru_tmp",
5895 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5897 ir_dereference_variable
*deref_is_fallthru_var
=
5898 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5899 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5902 /* Initialize continue_inside state to false.
5904 state
->switch_state
.continue_inside
=
5905 new(ctx
) ir_variable(glsl_type::bool_type
,
5906 "continue_inside_tmp",
5908 instructions
->push_tail(state
->switch_state
.continue_inside
);
5910 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5911 ir_dereference_variable
*deref_continue_inside_var
=
5912 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5913 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5916 state
->switch_state
.run_default
=
5917 new(ctx
) ir_variable(glsl_type::bool_type
,
5920 instructions
->push_tail(state
->switch_state
.run_default
);
5922 /* Loop around the switch is used for flow control. */
5923 ir_loop
* loop
= new(ctx
) ir_loop();
5924 instructions
->push_tail(loop
);
5926 /* Cache test expression.
5928 test_to_hir(&loop
->body_instructions
, state
);
5930 /* Emit code for body of switch stmt.
5932 body
->hir(&loop
->body_instructions
, state
);
5934 /* Insert a break at the end to exit loop. */
5935 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5936 loop
->body_instructions
.push_tail(jump
);
5938 /* If we are inside loop, check if continue got called inside switch. */
5939 if (state
->loop_nesting_ast
!= NULL
) {
5940 ir_dereference_variable
*deref_continue_inside
=
5941 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5942 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5943 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5945 if (state
->loop_nesting_ast
!= NULL
) {
5946 if (state
->loop_nesting_ast
->rest_expression
) {
5947 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5950 if (state
->loop_nesting_ast
->mode
==
5951 ast_iteration_statement::ast_do_while
) {
5952 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5955 irif
->then_instructions
.push_tail(jump
);
5956 instructions
->push_tail(irif
);
5959 hash_table_dtor(state
->switch_state
.labels_ht
);
5961 state
->switch_state
= saved
;
5963 /* Switch statements do not have r-values. */
5969 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5970 struct _mesa_glsl_parse_state
*state
)
5974 /* set to true to avoid a duplicate "use of uninitialized variable" warning
5975 * on the switch test case. The first one would be already raised when
5976 * getting the test_expression at ast_switch_statement::hir
5978 test_expression
->set_is_lhs(true);
5979 /* Cache value of test expression. */
5980 ir_rvalue
*const test_val
=
5981 test_expression
->hir(instructions
,
5984 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5987 ir_dereference_variable
*deref_test_var
=
5988 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5990 instructions
->push_tail(state
->switch_state
.test_var
);
5991 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5996 ast_switch_body::hir(exec_list
*instructions
,
5997 struct _mesa_glsl_parse_state
*state
)
6000 stmts
->hir(instructions
, state
);
6002 /* Switch bodies do not have r-values. */
6007 ast_case_statement_list::hir(exec_list
*instructions
,
6008 struct _mesa_glsl_parse_state
*state
)
6010 exec_list default_case
, after_default
, tmp
;
6012 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6013 case_stmt
->hir(&tmp
, state
);
6016 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6017 default_case
.append_list(&tmp
);
6021 /* If default case found, append 'after_default' list. */
6022 if (!default_case
.is_empty())
6023 after_default
.append_list(&tmp
);
6025 instructions
->append_list(&tmp
);
6028 /* Handle the default case. This is done here because default might not be
6029 * the last case. We need to add checks against following cases first to see
6030 * if default should be chosen or not.
6032 if (!default_case
.is_empty()) {
6034 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6035 ir_dereference_variable
*deref_run_default_var
=
6036 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6038 /* Choose to run default case initially, following conditional
6039 * assignments might change this.
6041 ir_assignment
*const init_var
=
6042 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6043 instructions
->push_tail(init_var
);
6045 /* Default case was the last one, no checks required. */
6046 if (after_default
.is_empty()) {
6047 instructions
->append_list(&default_case
);
6051 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6052 ir_assignment
*assign
= ir
->as_assignment();
6057 /* Clone the check between case label and init expression. */
6058 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6059 ir_expression
*clone
= exp
->clone(state
, NULL
);
6061 ir_dereference_variable
*deref_var
=
6062 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6063 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6065 ir_assignment
*const set_false
=
6066 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6068 instructions
->push_tail(set_false
);
6071 /* Append default case and all cases after it. */
6072 instructions
->append_list(&default_case
);
6073 instructions
->append_list(&after_default
);
6076 /* Case statements do not have r-values. */
6081 ast_case_statement::hir(exec_list
*instructions
,
6082 struct _mesa_glsl_parse_state
*state
)
6084 labels
->hir(instructions
, state
);
6086 /* Guard case statements depending on fallthru state. */
6087 ir_dereference_variable
*const deref_fallthru_guard
=
6088 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6089 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6091 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6092 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6094 instructions
->push_tail(test_fallthru
);
6096 /* Case statements do not have r-values. */
6102 ast_case_label_list::hir(exec_list
*instructions
,
6103 struct _mesa_glsl_parse_state
*state
)
6105 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6106 label
->hir(instructions
, state
);
6108 /* Case labels do not have r-values. */
6113 ast_case_label::hir(exec_list
*instructions
,
6114 struct _mesa_glsl_parse_state
*state
)
6118 ir_dereference_variable
*deref_fallthru_var
=
6119 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6121 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6123 /* If not default case, ... */
6124 if (this->test_value
!= NULL
) {
6125 /* Conditionally set fallthru state based on
6126 * comparison of cached test expression value to case label.
6128 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6129 ir_constant
*label_const
= label_rval
->constant_expression_value();
6132 YYLTYPE loc
= this->test_value
->get_location();
6134 _mesa_glsl_error(& loc
, state
,
6135 "switch statement case label must be a "
6136 "constant expression");
6138 /* Stuff a dummy value in to allow processing to continue. */
6139 label_const
= new(ctx
) ir_constant(0);
6141 ast_expression
*previous_label
= (ast_expression
*)
6142 hash_table_find(state
->switch_state
.labels_ht
,
6143 (void *)(uintptr_t)label_const
->value
.u
[0]);
6145 if (previous_label
) {
6146 YYLTYPE loc
= this->test_value
->get_location();
6147 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6149 loc
= previous_label
->get_location();
6150 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6152 hash_table_insert(state
->switch_state
.labels_ht
,
6154 (void *)(uintptr_t)label_const
->value
.u
[0]);
6158 ir_dereference_variable
*deref_test_var
=
6159 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6161 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6166 * From GLSL 4.40 specification section 6.2 ("Selection"):
6168 * "The type of the init-expression value in a switch statement must
6169 * be a scalar int or uint. The type of the constant-expression value
6170 * in a case label also must be a scalar int or uint. When any pair
6171 * of these values is tested for "equal value" and the types do not
6172 * match, an implicit conversion will be done to convert the int to a
6173 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6176 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6177 YYLTYPE loc
= this->test_value
->get_location();
6179 const glsl_type
*type_a
= label_const
->type
;
6180 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6182 /* Check if int->uint implicit conversion is supported. */
6183 bool integer_conversion_supported
=
6184 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6187 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6188 !integer_conversion_supported
) {
6189 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6190 "init-expression and case label (%s != %s)",
6191 type_a
->name
, type_b
->name
);
6193 /* Conversion of the case label. */
6194 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6195 if (!apply_implicit_conversion(glsl_type::uint_type
,
6196 test_cond
->operands
[0], state
))
6197 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6199 /* Conversion of the init-expression value. */
6200 if (!apply_implicit_conversion(glsl_type::uint_type
,
6201 test_cond
->operands
[1], state
))
6202 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6207 ir_assignment
*set_fallthru_on_test
=
6208 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6210 instructions
->push_tail(set_fallthru_on_test
);
6211 } else { /* default case */
6212 if (state
->switch_state
.previous_default
) {
6213 YYLTYPE loc
= this->get_location();
6214 _mesa_glsl_error(& loc
, state
,
6215 "multiple default labels in one switch");
6217 loc
= state
->switch_state
.previous_default
->get_location();
6218 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6220 state
->switch_state
.previous_default
= this;
6222 /* Set fallthru condition on 'run_default' bool. */
6223 ir_dereference_variable
*deref_run_default
=
6224 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6225 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6226 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6230 /* Set falltrhu state. */
6231 ir_assignment
*set_fallthru
=
6232 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6234 instructions
->push_tail(set_fallthru
);
6237 /* Case statements do not have r-values. */
6242 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6243 struct _mesa_glsl_parse_state
*state
)
6247 if (condition
!= NULL
) {
6248 ir_rvalue
*const cond
=
6249 condition
->hir(instructions
, state
);
6252 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6253 YYLTYPE loc
= condition
->get_location();
6255 _mesa_glsl_error(& loc
, state
,
6256 "loop condition must be scalar boolean");
6258 /* As the first code in the loop body, generate a block that looks
6259 * like 'if (!condition) break;' as the loop termination condition.
6261 ir_rvalue
*const not_cond
=
6262 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6264 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6266 ir_jump
*const break_stmt
=
6267 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6269 if_stmt
->then_instructions
.push_tail(break_stmt
);
6270 instructions
->push_tail(if_stmt
);
6277 ast_iteration_statement::hir(exec_list
*instructions
,
6278 struct _mesa_glsl_parse_state
*state
)
6282 /* For-loops and while-loops start a new scope, but do-while loops do not.
6284 if (mode
!= ast_do_while
)
6285 state
->symbols
->push_scope();
6287 if (init_statement
!= NULL
)
6288 init_statement
->hir(instructions
, state
);
6290 ir_loop
*const stmt
= new(ctx
) ir_loop();
6291 instructions
->push_tail(stmt
);
6293 /* Track the current loop nesting. */
6294 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6296 state
->loop_nesting_ast
= this;
6298 /* Likewise, indicate that following code is closest to a loop,
6299 * NOT closest to a switch.
6301 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6302 state
->switch_state
.is_switch_innermost
= false;
6304 if (mode
!= ast_do_while
)
6305 condition_to_hir(&stmt
->body_instructions
, state
);
6308 body
->hir(& stmt
->body_instructions
, state
);
6310 if (rest_expression
!= NULL
)
6311 rest_expression
->hir(& stmt
->body_instructions
, state
);
6313 if (mode
== ast_do_while
)
6314 condition_to_hir(&stmt
->body_instructions
, state
);
6316 if (mode
!= ast_do_while
)
6317 state
->symbols
->pop_scope();
6319 /* Restore previous nesting before returning. */
6320 state
->loop_nesting_ast
= nesting_ast
;
6321 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6323 /* Loops do not have r-values.
6330 * Determine if the given type is valid for establishing a default precision
6333 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6335 * "The precision statement
6337 * precision precision-qualifier type;
6339 * can be used to establish a default precision qualifier. The type field
6340 * can be either int or float or any of the sampler types, and the
6341 * precision-qualifier can be lowp, mediump, or highp."
6343 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6344 * qualifiers on sampler types, but this seems like an oversight (since the
6345 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6346 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6350 is_valid_default_precision_type(const struct glsl_type
*const type
)
6355 switch (type
->base_type
) {
6357 case GLSL_TYPE_FLOAT
:
6358 /* "int" and "float" are valid, but vectors and matrices are not. */
6359 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6360 case GLSL_TYPE_SAMPLER
:
6361 case GLSL_TYPE_IMAGE
:
6362 case GLSL_TYPE_ATOMIC_UINT
:
6371 ast_type_specifier::hir(exec_list
*instructions
,
6372 struct _mesa_glsl_parse_state
*state
)
6374 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6377 YYLTYPE loc
= this->get_location();
6379 /* If this is a precision statement, check that the type to which it is
6380 * applied is either float or int.
6382 * From section 4.5.3 of the GLSL 1.30 spec:
6383 * "The precision statement
6384 * precision precision-qualifier type;
6385 * can be used to establish a default precision qualifier. The type
6386 * field can be either int or float [...]. Any other types or
6387 * qualifiers will result in an error.
6389 if (this->default_precision
!= ast_precision_none
) {
6390 if (!state
->check_precision_qualifiers_allowed(&loc
))
6393 if (this->structure
!= NULL
) {
6394 _mesa_glsl_error(&loc
, state
,
6395 "precision qualifiers do not apply to structures");
6399 if (this->array_specifier
!= NULL
) {
6400 _mesa_glsl_error(&loc
, state
,
6401 "default precision statements do not apply to "
6406 const struct glsl_type
*const type
=
6407 state
->symbols
->get_type(this->type_name
);
6408 if (!is_valid_default_precision_type(type
)) {
6409 _mesa_glsl_error(&loc
, state
,
6410 "default precision statements apply only to "
6411 "float, int, and opaque types");
6415 if (state
->es_shader
) {
6416 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6419 * "Non-precision qualified declarations will use the precision
6420 * qualifier specified in the most recent precision statement
6421 * that is still in scope. The precision statement has the same
6422 * scoping rules as variable declarations. If it is declared
6423 * inside a compound statement, its effect stops at the end of
6424 * the innermost statement it was declared in. Precision
6425 * statements in nested scopes override precision statements in
6426 * outer scopes. Multiple precision statements for the same basic
6427 * type can appear inside the same scope, with later statements
6428 * overriding earlier statements within that scope."
6430 * Default precision specifications follow the same scope rules as
6431 * variables. So, we can track the state of the default precision
6432 * qualifiers in the symbol table, and the rules will just work. This
6433 * is a slight abuse of the symbol table, but it has the semantics
6436 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6437 this->default_precision
);
6440 /* FINISHME: Translate precision statements into IR. */
6444 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6445 * process_record_constructor() can do type-checking on C-style initializer
6446 * expressions of structs, but ast_struct_specifier should only be translated
6447 * to HIR if it is declaring the type of a structure.
6449 * The ->is_declaration field is false for initializers of variables
6450 * declared separately from the struct's type definition.
6452 * struct S { ... }; (is_declaration = true)
6453 * struct T { ... } t = { ... }; (is_declaration = true)
6454 * S s = { ... }; (is_declaration = false)
6456 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6457 return this->structure
->hir(instructions
, state
);
6464 * Process a structure or interface block tree into an array of structure fields
6466 * After parsing, where there are some syntax differnces, structures and
6467 * interface blocks are almost identical. They are similar enough that the
6468 * AST for each can be processed the same way into a set of
6469 * \c glsl_struct_field to describe the members.
6471 * If we're processing an interface block, var_mode should be the type of the
6472 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6473 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6477 * The number of fields processed. A pointer to the array structure fields is
6478 * stored in \c *fields_ret.
6481 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6482 struct _mesa_glsl_parse_state
*state
,
6483 exec_list
*declarations
,
6484 glsl_struct_field
**fields_ret
,
6486 enum glsl_matrix_layout matrix_layout
,
6487 bool allow_reserved_names
,
6488 ir_variable_mode var_mode
,
6489 ast_type_qualifier
*layout
,
6490 unsigned block_stream
,
6491 unsigned block_xfb_buffer
,
6492 unsigned block_xfb_offset
,
6493 unsigned expl_location
,
6494 unsigned expl_align
)
6496 unsigned decl_count
= 0;
6497 unsigned next_offset
= 0;
6499 /* Make an initial pass over the list of fields to determine how
6500 * many there are. Each element in this list is an ast_declarator_list.
6501 * This means that we actually need to count the number of elements in the
6502 * 'declarations' list in each of the elements.
6504 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6505 decl_count
+= decl_list
->declarations
.length();
6508 /* Allocate storage for the fields and process the field
6509 * declarations. As the declarations are processed, try to also convert
6510 * the types to HIR. This ensures that structure definitions embedded in
6511 * other structure definitions or in interface blocks are processed.
6513 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6516 bool first_member
= true;
6517 bool first_member_has_explicit_location
= false;
6520 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6521 const char *type_name
;
6522 YYLTYPE loc
= decl_list
->get_location();
6524 decl_list
->type
->specifier
->hir(instructions
, state
);
6526 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6528 * "Anonymous structures are not supported; so embedded structures
6529 * must have a declarator. A name given to an embedded struct is
6530 * scoped at the same level as the struct it is embedded in."
6532 * The same section of the GLSL 1.20 spec says:
6534 * "Anonymous structures are not supported. Embedded structures are
6537 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6538 * embedded structures in 1.10 only.
6540 if (state
->language_version
!= 110 &&
6541 decl_list
->type
->specifier
->structure
!= NULL
)
6542 _mesa_glsl_error(&loc
, state
,
6543 "embedded structure declarations are not allowed");
6545 const glsl_type
*decl_type
=
6546 decl_list
->type
->glsl_type(& type_name
, state
);
6548 const struct ast_type_qualifier
*const qual
=
6549 &decl_list
->type
->qualifier
;
6551 /* From section 4.3.9 of the GLSL 4.40 spec:
6553 * "[In interface blocks] opaque types are not allowed."
6555 * It should be impossible for decl_type to be NULL here. Cases that
6556 * might naturally lead to decl_type being NULL, especially for the
6557 * is_interface case, will have resulted in compilation having
6558 * already halted due to a syntax error.
6563 if (decl_type
->contains_opaque()) {
6564 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6565 "interface block contains opaque variable");
6568 if (decl_type
->contains_atomic()) {
6569 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6571 * "Members of structures cannot be declared as atomic counter
6574 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6577 if (decl_type
->contains_image()) {
6578 /* FINISHME: Same problem as with atomic counters.
6579 * FINISHME: Request clarification from Khronos and add
6580 * FINISHME: spec quotation here.
6582 _mesa_glsl_error(&loc
, state
, "image in structure");
6586 if (qual
->flags
.q
.explicit_binding
) {
6587 _mesa_glsl_error(&loc
, state
,
6588 "binding layout qualifier cannot be applied "
6589 "to struct or interface block members");
6593 if (!first_member
) {
6594 if (!layout
->flags
.q
.explicit_location
&&
6595 ((first_member_has_explicit_location
&&
6596 !qual
->flags
.q
.explicit_location
) ||
6597 (!first_member_has_explicit_location
&&
6598 qual
->flags
.q
.explicit_location
))) {
6599 _mesa_glsl_error(&loc
, state
,
6600 "when block-level location layout qualifier "
6601 "is not supplied either all members must "
6602 "have a location layout qualifier or all "
6603 "members must not have a location layout "
6607 first_member
= false;
6608 first_member_has_explicit_location
=
6609 qual
->flags
.q
.explicit_location
;
6613 if (qual
->flags
.q
.std140
||
6614 qual
->flags
.q
.std430
||
6615 qual
->flags
.q
.packed
||
6616 qual
->flags
.q
.shared
) {
6617 _mesa_glsl_error(&loc
, state
,
6618 "uniform/shader storage block layout qualifiers "
6619 "std140, std430, packed, and shared can only be "
6620 "applied to uniform/shader storage blocks, not "
6624 if (qual
->flags
.q
.constant
) {
6625 _mesa_glsl_error(&loc
, state
,
6626 "const storage qualifier cannot be applied "
6627 "to struct or interface block members");
6630 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6632 * "A block member may be declared with a stream identifier, but
6633 * the specified stream must match the stream associated with the
6634 * containing block."
6636 if (qual
->flags
.q
.explicit_stream
) {
6637 unsigned qual_stream
;
6638 if (process_qualifier_constant(state
, &loc
, "stream",
6639 qual
->stream
, &qual_stream
) &&
6640 qual_stream
!= block_stream
) {
6641 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6642 "interface block member does not match "
6643 "the interface block (%u vs %u)", qual_stream
,
6649 unsigned explicit_xfb_buffer
= 0;
6650 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6651 unsigned qual_xfb_buffer
;
6652 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6653 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6654 explicit_xfb_buffer
= 1;
6655 if (qual_xfb_buffer
!= block_xfb_buffer
)
6656 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6657 "interface block member does not match "
6658 "the interface block (%u vs %u)",
6659 qual_xfb_buffer
, block_xfb_buffer
);
6661 xfb_buffer
= (int) qual_xfb_buffer
;
6664 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
6665 xfb_buffer
= (int) block_xfb_buffer
;
6668 int xfb_stride
= -1;
6669 if (qual
->flags
.q
.explicit_xfb_stride
) {
6670 unsigned qual_xfb_stride
;
6671 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6672 qual
->xfb_stride
, &qual_xfb_stride
)) {
6673 xfb_stride
= (int) qual_xfb_stride
;
6677 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6678 _mesa_glsl_error(&loc
, state
,
6679 "interpolation qualifiers cannot be used "
6680 "with uniform interface blocks");
6683 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6684 qual
->has_auxiliary_storage()) {
6685 _mesa_glsl_error(&loc
, state
,
6686 "auxiliary storage qualifiers cannot be used "
6687 "in uniform blocks or structures.");
6690 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6691 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6692 _mesa_glsl_error(&loc
, state
,
6693 "row_major and column_major can only be "
6694 "applied to interface blocks");
6696 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6699 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6700 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6701 "readonly and writeonly.");
6704 foreach_list_typed (ast_declaration
, decl
, link
,
6705 &decl_list
->declarations
) {
6706 YYLTYPE loc
= decl
->get_location();
6708 if (!allow_reserved_names
)
6709 validate_identifier(decl
->identifier
, loc
, state
);
6711 const struct glsl_type
*field_type
=
6712 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6713 validate_array_dimensions(field_type
, state
, &loc
);
6714 fields
[i
].type
= field_type
;
6715 fields
[i
].name
= decl
->identifier
;
6716 fields
[i
].interpolation
=
6717 interpret_interpolation_qualifier(qual
, field_type
,
6718 var_mode
, state
, &loc
);
6719 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6720 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6721 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6722 fields
[i
].precision
= qual
->precision
;
6723 fields
[i
].offset
= -1;
6724 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6725 fields
[i
].xfb_buffer
= xfb_buffer
;
6726 fields
[i
].xfb_stride
= xfb_stride
;
6728 if (qual
->flags
.q
.explicit_location
) {
6729 unsigned qual_location
;
6730 if (process_qualifier_constant(state
, &loc
, "location",
6731 qual
->location
, &qual_location
)) {
6732 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6733 expl_location
= fields
[i
].location
+
6734 fields
[i
].type
->count_attribute_slots(false);
6737 if (layout
&& layout
->flags
.q
.explicit_location
) {
6738 fields
[i
].location
= expl_location
;
6739 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6741 fields
[i
].location
= -1;
6745 /* Offset can only be used with std430 and std140 layouts an initial
6746 * value of 0 is used for error detection.
6752 if (qual
->flags
.q
.row_major
||
6753 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6759 if(layout
->flags
.q
.std140
) {
6760 align
= field_type
->std140_base_alignment(row_major
);
6761 size
= field_type
->std140_size(row_major
);
6762 } else if (layout
->flags
.q
.std430
) {
6763 align
= field_type
->std430_base_alignment(row_major
);
6764 size
= field_type
->std430_size(row_major
);
6768 if (qual
->flags
.q
.explicit_offset
) {
6769 unsigned qual_offset
;
6770 if (process_qualifier_constant(state
, &loc
, "offset",
6771 qual
->offset
, &qual_offset
)) {
6772 if (align
!= 0 && size
!= 0) {
6773 if (next_offset
> qual_offset
)
6774 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6775 "offset overlaps previous member");
6777 if (qual_offset
% align
) {
6778 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6779 "must be a multiple of the base "
6780 "alignment of %s", field_type
->name
);
6782 fields
[i
].offset
= qual_offset
;
6783 next_offset
= glsl_align(qual_offset
+ size
, align
);
6785 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6786 "with std430 and std140 layouts");
6791 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6792 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6794 if (align
== 0 || size
== 0) {
6795 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6796 "std430 and std140 layouts");
6797 } else if (qual
->flags
.q
.explicit_align
) {
6798 unsigned member_align
;
6799 if (process_qualifier_constant(state
, &loc
, "align",
6800 qual
->align
, &member_align
)) {
6801 if (member_align
== 0 ||
6802 member_align
& (member_align
- 1)) {
6803 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6804 "in not a power of 2");
6806 fields
[i
].offset
= glsl_align(offset
, member_align
);
6807 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6811 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6812 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6816 if (!qual
->flags
.q
.explicit_offset
) {
6817 if (align
!= 0 && size
!= 0)
6818 next_offset
= glsl_align(next_offset
+ size
, align
);
6821 /* From the ARB_enhanced_layouts spec:
6823 * "The given offset applies to the first component of the first
6824 * member of the qualified entity. Then, within the qualified
6825 * entity, subsequent components are each assigned, in order, to
6826 * the next available offset aligned to a multiple of that
6827 * component's size. Aggregate types are flattened down to the
6828 * component level to get this sequence of components."
6830 if (qual
->flags
.q
.explicit_xfb_offset
) {
6831 unsigned xfb_offset
;
6832 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
6833 qual
->offset
, &xfb_offset
)) {
6834 fields
[i
].offset
= xfb_offset
;
6835 block_xfb_offset
= fields
[i
].offset
+
6836 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6839 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
6840 unsigned align
= field_type
->is_double() ? 8 : 4;
6841 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
6843 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6847 /* Propogate row- / column-major information down the fields of the
6848 * structure or interface block. Structures need this data because
6849 * the structure may contain a structure that contains ... a matrix
6850 * that need the proper layout.
6852 if (is_interface
&& layout
&&
6853 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6854 (field_type
->without_array()->is_matrix()
6855 || field_type
->without_array()->is_record())) {
6856 /* If no layout is specified for the field, inherit the layout
6859 fields
[i
].matrix_layout
= matrix_layout
;
6861 if (qual
->flags
.q
.row_major
)
6862 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6863 else if (qual
->flags
.q
.column_major
)
6864 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6866 /* If we're processing an uniform or buffer block, the matrix
6867 * layout must be decided by this point.
6869 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6870 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6873 /* Image qualifiers are allowed on buffer variables, which can only
6874 * be defined inside shader storage buffer objects
6876 if (layout
&& var_mode
== ir_var_shader_storage
) {
6877 /* For readonly and writeonly qualifiers the field definition,
6878 * if set, overwrites the layout qualifier.
6880 if (qual
->flags
.q
.read_only
) {
6881 fields
[i
].image_read_only
= true;
6882 fields
[i
].image_write_only
= false;
6883 } else if (qual
->flags
.q
.write_only
) {
6884 fields
[i
].image_read_only
= false;
6885 fields
[i
].image_write_only
= true;
6887 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6888 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6891 /* For other qualifiers, we set the flag if either the layout
6892 * qualifier or the field qualifier are set
6894 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6895 layout
->flags
.q
.coherent
;
6896 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6897 layout
->flags
.q
._volatile
;
6898 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6899 layout
->flags
.q
.restrict_flag
;
6906 assert(i
== decl_count
);
6908 *fields_ret
= fields
;
6914 ast_struct_specifier::hir(exec_list
*instructions
,
6915 struct _mesa_glsl_parse_state
*state
)
6917 YYLTYPE loc
= this->get_location();
6919 unsigned expl_location
= 0;
6920 if (layout
&& layout
->flags
.q
.explicit_location
) {
6921 if (!process_qualifier_constant(state
, &loc
, "location",
6922 layout
->location
, &expl_location
)) {
6925 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6929 glsl_struct_field
*fields
;
6930 unsigned decl_count
=
6931 ast_process_struct_or_iface_block_members(instructions
,
6933 &this->declarations
,
6936 GLSL_MATRIX_LAYOUT_INHERITED
,
6937 false /* allow_reserved_names */,
6940 0, /* for interface only */
6941 0, /* for interface only */
6942 0, /* for interface only */
6944 0 /* for interface only */);
6946 validate_identifier(this->name
, loc
, state
);
6948 const glsl_type
*t
=
6949 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6951 if (!state
->symbols
->add_type(name
, t
)) {
6952 const glsl_type
*match
= state
->symbols
->get_type(name
);
6953 /* allow struct matching for desktop GL - older UE4 does this */
6954 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
6955 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
6957 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6959 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6961 state
->num_user_structures
+ 1);
6963 s
[state
->num_user_structures
] = t
;
6964 state
->user_structures
= s
;
6965 state
->num_user_structures
++;
6969 /* Structure type definitions do not have r-values.
6976 * Visitor class which detects whether a given interface block has been used.
6978 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6981 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6982 : mode(mode
), block(block
), found(false)
6986 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6988 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6992 return visit_continue
;
6995 bool usage_found() const
7001 ir_variable_mode mode
;
7002 const glsl_type
*block
;
7007 is_unsized_array_last_element(ir_variable
*v
)
7009 const glsl_type
*interface_type
= v
->get_interface_type();
7010 int length
= interface_type
->length
;
7012 assert(v
->type
->is_unsized_array());
7014 /* Check if it is the last element of the interface */
7015 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7021 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7023 var
->data
.image_read_only
= field
.image_read_only
;
7024 var
->data
.image_write_only
= field
.image_write_only
;
7025 var
->data
.image_coherent
= field
.image_coherent
;
7026 var
->data
.image_volatile
= field
.image_volatile
;
7027 var
->data
.image_restrict
= field
.image_restrict
;
7031 ast_interface_block::hir(exec_list
*instructions
,
7032 struct _mesa_glsl_parse_state
*state
)
7034 YYLTYPE loc
= this->get_location();
7036 /* Interface blocks must be declared at global scope */
7037 if (state
->current_function
!= NULL
) {
7038 _mesa_glsl_error(&loc
, state
,
7039 "Interface block `%s' must be declared "
7044 if (!this->layout
.flags
.q
.buffer
&&
7045 this->layout
.flags
.q
.std430
) {
7046 _mesa_glsl_error(&loc
, state
,
7047 "std430 storage block layout qualifier is supported "
7048 "only for shader storage blocks");
7051 /* The ast_interface_block has a list of ast_declarator_lists. We
7052 * need to turn those into ir_variables with an association
7053 * with this uniform block.
7055 enum glsl_interface_packing packing
;
7056 if (this->layout
.flags
.q
.shared
) {
7057 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7058 } else if (this->layout
.flags
.q
.packed
) {
7059 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7060 } else if (this->layout
.flags
.q
.std430
) {
7061 packing
= GLSL_INTERFACE_PACKING_STD430
;
7063 /* The default layout is std140.
7065 packing
= GLSL_INTERFACE_PACKING_STD140
;
7068 ir_variable_mode var_mode
;
7069 const char *iface_type_name
;
7070 if (this->layout
.flags
.q
.in
) {
7071 var_mode
= ir_var_shader_in
;
7072 iface_type_name
= "in";
7073 } else if (this->layout
.flags
.q
.out
) {
7074 var_mode
= ir_var_shader_out
;
7075 iface_type_name
= "out";
7076 } else if (this->layout
.flags
.q
.uniform
) {
7077 var_mode
= ir_var_uniform
;
7078 iface_type_name
= "uniform";
7079 } else if (this->layout
.flags
.q
.buffer
) {
7080 var_mode
= ir_var_shader_storage
;
7081 iface_type_name
= "buffer";
7083 var_mode
= ir_var_auto
;
7084 iface_type_name
= "UNKNOWN";
7085 assert(!"interface block layout qualifier not found!");
7088 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7089 if (this->layout
.flags
.q
.row_major
)
7090 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7091 else if (this->layout
.flags
.q
.column_major
)
7092 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7094 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7095 exec_list declared_variables
;
7096 glsl_struct_field
*fields
;
7098 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7099 * that we don't have incompatible qualifiers
7101 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7102 _mesa_glsl_error(&loc
, state
,
7103 "Interface block sets both readonly and writeonly");
7106 if (this->layout
.flags
.q
.explicit_component
) {
7107 _mesa_glsl_error(&loc
, state
, "component layout qualifier cannot be "
7108 "applied to a matrix, a structure, a block, or an "
7109 "array containing any of these.");
7112 unsigned qual_stream
;
7113 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7115 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7116 /* If the stream qualifier is invalid it doesn't make sense to continue
7117 * on and try to compare stream layouts on member variables against it
7118 * so just return early.
7123 unsigned qual_xfb_buffer
;
7124 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7125 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7126 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7130 unsigned qual_xfb_offset
;
7131 if (layout
.flags
.q
.explicit_xfb_offset
) {
7132 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7133 layout
.offset
, &qual_xfb_offset
)) {
7138 unsigned qual_xfb_stride
;
7139 if (layout
.flags
.q
.explicit_xfb_stride
) {
7140 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7141 layout
.xfb_stride
, &qual_xfb_stride
)) {
7146 unsigned expl_location
= 0;
7147 if (layout
.flags
.q
.explicit_location
) {
7148 if (!process_qualifier_constant(state
, &loc
, "location",
7149 layout
.location
, &expl_location
)) {
7152 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7156 unsigned expl_align
= 0;
7157 if (layout
.flags
.q
.explicit_align
) {
7158 if (!process_qualifier_constant(state
, &loc
, "align",
7159 layout
.align
, &expl_align
)) {
7162 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7163 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7170 unsigned int num_variables
=
7171 ast_process_struct_or_iface_block_members(&declared_variables
,
7173 &this->declarations
,
7177 redeclaring_per_vertex
,
7186 if (!redeclaring_per_vertex
) {
7187 validate_identifier(this->block_name
, loc
, state
);
7189 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7191 * "Block names have no other use within a shader beyond interface
7192 * matching; it is a compile-time error to use a block name at global
7193 * scope for anything other than as a block name."
7195 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7196 if (var
&& !var
->type
->is_interface()) {
7197 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7198 "already used in the scope.",
7203 const glsl_type
*earlier_per_vertex
= NULL
;
7204 if (redeclaring_per_vertex
) {
7205 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7206 * the named interface block gl_in, we can find it by looking at the
7207 * previous declaration of gl_in. Otherwise we can find it by looking
7208 * at the previous decalartion of any of the built-in outputs,
7211 * Also check that the instance name and array-ness of the redeclaration
7215 case ir_var_shader_in
:
7216 if (ir_variable
*earlier_gl_in
=
7217 state
->symbols
->get_variable("gl_in")) {
7218 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7220 _mesa_glsl_error(&loc
, state
,
7221 "redeclaration of gl_PerVertex input not allowed "
7223 _mesa_shader_stage_to_string(state
->stage
));
7225 if (this->instance_name
== NULL
||
7226 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7227 !this->array_specifier
->is_single_dimension()) {
7228 _mesa_glsl_error(&loc
, state
,
7229 "gl_PerVertex input must be redeclared as "
7233 case ir_var_shader_out
:
7234 if (ir_variable
*earlier_gl_Position
=
7235 state
->symbols
->get_variable("gl_Position")) {
7236 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7237 } else if (ir_variable
*earlier_gl_out
=
7238 state
->symbols
->get_variable("gl_out")) {
7239 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7241 _mesa_glsl_error(&loc
, state
,
7242 "redeclaration of gl_PerVertex output not "
7243 "allowed in the %s shader",
7244 _mesa_shader_stage_to_string(state
->stage
));
7246 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7247 if (this->instance_name
== NULL
||
7248 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7249 _mesa_glsl_error(&loc
, state
,
7250 "gl_PerVertex output must be redeclared as "
7254 if (this->instance_name
!= NULL
) {
7255 _mesa_glsl_error(&loc
, state
,
7256 "gl_PerVertex output may not be redeclared with "
7257 "an instance name");
7262 _mesa_glsl_error(&loc
, state
,
7263 "gl_PerVertex must be declared as an input or an "
7268 if (earlier_per_vertex
== NULL
) {
7269 /* An error has already been reported. Bail out to avoid null
7270 * dereferences later in this function.
7275 /* Copy locations from the old gl_PerVertex interface block. */
7276 for (unsigned i
= 0; i
< num_variables
; i
++) {
7277 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7279 _mesa_glsl_error(&loc
, state
,
7280 "redeclaration of gl_PerVertex must be a subset "
7281 "of the built-in members of gl_PerVertex");
7283 fields
[i
].location
=
7284 earlier_per_vertex
->fields
.structure
[j
].location
;
7286 earlier_per_vertex
->fields
.structure
[j
].offset
;
7287 fields
[i
].interpolation
=
7288 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7289 fields
[i
].centroid
=
7290 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7292 earlier_per_vertex
->fields
.structure
[j
].sample
;
7294 earlier_per_vertex
->fields
.structure
[j
].patch
;
7295 fields
[i
].precision
=
7296 earlier_per_vertex
->fields
.structure
[j
].precision
;
7297 fields
[i
].explicit_xfb_buffer
=
7298 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7299 fields
[i
].xfb_buffer
=
7300 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7301 fields
[i
].xfb_stride
=
7302 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7306 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7309 * If a built-in interface block is redeclared, it must appear in
7310 * the shader before any use of any member included in the built-in
7311 * declaration, or a compilation error will result.
7313 * This appears to be a clarification to the behaviour established for
7314 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7315 * regardless of GLSL version.
7317 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7318 v
.run(instructions
);
7319 if (v
.usage_found()) {
7320 _mesa_glsl_error(&loc
, state
,
7321 "redeclaration of a built-in interface block must "
7322 "appear before any use of any member of the "
7327 const glsl_type
*block_type
=
7328 glsl_type::get_interface_instance(fields
,
7333 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7335 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7336 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7339 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7340 YYLTYPE loc
= this->get_location();
7341 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7342 "already taken in the current scope",
7343 this->block_name
, iface_type_name
);
7346 /* Since interface blocks cannot contain statements, it should be
7347 * impossible for the block to generate any instructions.
7349 assert(declared_variables
.is_empty());
7351 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7353 * Geometry shader input variables get the per-vertex values written
7354 * out by vertex shader output variables of the same names. Since a
7355 * geometry shader operates on a set of vertices, each input varying
7356 * variable (or input block, see interface blocks below) needs to be
7357 * declared as an array.
7359 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7360 var_mode
== ir_var_shader_in
) {
7361 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7362 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7363 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7364 this->array_specifier
== NULL
&&
7365 var_mode
== ir_var_shader_in
) {
7366 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7367 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7368 this->array_specifier
== NULL
&&
7369 var_mode
== ir_var_shader_out
) {
7370 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7374 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7377 * "If an instance name (instance-name) is used, then it puts all the
7378 * members inside a scope within its own name space, accessed with the
7379 * field selector ( . ) operator (analogously to structures)."
7381 if (this->instance_name
) {
7382 if (redeclaring_per_vertex
) {
7383 /* When a built-in in an unnamed interface block is redeclared,
7384 * get_variable_being_redeclared() calls
7385 * check_builtin_array_max_size() to make sure that built-in array
7386 * variables aren't redeclared to illegal sizes. But we're looking
7387 * at a redeclaration of a named built-in interface block. So we
7388 * have to manually call check_builtin_array_max_size() for all parts
7389 * of the interface that are arrays.
7391 for (unsigned i
= 0; i
< num_variables
; i
++) {
7392 if (fields
[i
].type
->is_array()) {
7393 const unsigned size
= fields
[i
].type
->array_size();
7394 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7398 validate_identifier(this->instance_name
, loc
, state
);
7403 if (this->array_specifier
!= NULL
) {
7404 const glsl_type
*block_array_type
=
7405 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7407 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7409 * For uniform blocks declared an array, each individual array
7410 * element corresponds to a separate buffer object backing one
7411 * instance of the block. As the array size indicates the number
7412 * of buffer objects needed, uniform block array declarations
7413 * must specify an array size.
7415 * And a few paragraphs later:
7417 * Geometry shader input blocks must be declared as arrays and
7418 * follow the array declaration and linking rules for all
7419 * geometry shader inputs. All other input and output block
7420 * arrays must specify an array size.
7422 * The same applies to tessellation shaders.
7424 * The upshot of this is that the only circumstance where an
7425 * interface array size *doesn't* need to be specified is on a
7426 * geometry shader input, tessellation control shader input,
7427 * tessellation control shader output, and tessellation evaluation
7430 if (block_array_type
->is_unsized_array()) {
7431 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7432 state
->stage
== MESA_SHADER_TESS_CTRL
||
7433 state
->stage
== MESA_SHADER_TESS_EVAL
;
7434 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7436 if (this->layout
.flags
.q
.in
) {
7438 _mesa_glsl_error(&loc
, state
,
7439 "unsized input block arrays not allowed in "
7441 _mesa_shader_stage_to_string(state
->stage
));
7442 } else if (this->layout
.flags
.q
.out
) {
7444 _mesa_glsl_error(&loc
, state
,
7445 "unsized output block arrays not allowed in "
7447 _mesa_shader_stage_to_string(state
->stage
));
7449 /* by elimination, this is a uniform block array */
7450 _mesa_glsl_error(&loc
, state
,
7451 "unsized uniform block arrays not allowed in "
7453 _mesa_shader_stage_to_string(state
->stage
));
7457 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7459 * * Arrays of arrays of blocks are not allowed
7461 if (state
->es_shader
&& block_array_type
->is_array() &&
7462 block_array_type
->fields
.array
->is_array()) {
7463 _mesa_glsl_error(&loc
, state
,
7464 "arrays of arrays interface blocks are "
7468 var
= new(state
) ir_variable(block_array_type
,
7469 this->instance_name
,
7472 var
= new(state
) ir_variable(block_type
,
7473 this->instance_name
,
7477 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7478 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7480 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7481 var
->data
.read_only
= true;
7483 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7484 handle_geometry_shader_input_decl(state
, loc
, var
);
7485 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7486 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7487 handle_tess_shader_input_decl(state
, loc
, var
);
7488 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7489 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7491 for (unsigned i
= 0; i
< num_variables
; i
++) {
7492 if (var
->data
.mode
== ir_var_shader_storage
)
7493 apply_memory_qualifiers(var
, fields
[i
]);
7496 if (ir_variable
*earlier
=
7497 state
->symbols
->get_variable(this->instance_name
)) {
7498 if (!redeclaring_per_vertex
) {
7499 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7500 this->instance_name
);
7502 earlier
->data
.how_declared
= ir_var_declared_normally
;
7503 earlier
->type
= var
->type
;
7504 earlier
->reinit_interface_type(block_type
);
7507 if (this->layout
.flags
.q
.explicit_binding
) {
7508 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7512 var
->data
.stream
= qual_stream
;
7513 if (layout
.flags
.q
.explicit_location
) {
7514 var
->data
.location
= expl_location
;
7515 var
->data
.explicit_location
= true;
7518 state
->symbols
->add_variable(var
);
7519 instructions
->push_tail(var
);
7522 /* In order to have an array size, the block must also be declared with
7525 assert(this->array_specifier
== NULL
);
7527 for (unsigned i
= 0; i
< num_variables
; i
++) {
7529 new(state
) ir_variable(fields
[i
].type
,
7530 ralloc_strdup(state
, fields
[i
].name
),
7532 var
->data
.interpolation
= fields
[i
].interpolation
;
7533 var
->data
.centroid
= fields
[i
].centroid
;
7534 var
->data
.sample
= fields
[i
].sample
;
7535 var
->data
.patch
= fields
[i
].patch
;
7536 var
->data
.stream
= qual_stream
;
7537 var
->data
.location
= fields
[i
].location
;
7539 if (fields
[i
].location
!= -1)
7540 var
->data
.explicit_location
= true;
7542 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7543 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7545 if (fields
[i
].offset
!= -1)
7546 var
->data
.explicit_xfb_offset
= true;
7547 var
->data
.offset
= fields
[i
].offset
;
7549 var
->init_interface_type(block_type
);
7551 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7552 var
->data
.read_only
= true;
7554 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7555 if (state
->es_shader
) {
7556 var
->data
.precision
=
7557 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7561 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7562 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7563 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7565 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7568 if (var
->data
.mode
== ir_var_shader_storage
)
7569 apply_memory_qualifiers(var
, fields
[i
]);
7571 /* Examine var name here since var may get deleted in the next call */
7572 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7574 if (redeclaring_per_vertex
) {
7575 ir_variable
*earlier
=
7576 get_variable_being_redeclared(var
, loc
, state
,
7577 true /* allow_all_redeclarations */);
7578 if (!var_is_gl_id
|| earlier
== NULL
) {
7579 _mesa_glsl_error(&loc
, state
,
7580 "redeclaration of gl_PerVertex can only "
7581 "include built-in variables");
7582 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7583 _mesa_glsl_error(&loc
, state
,
7584 "`%s' has already been redeclared",
7587 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7588 earlier
->reinit_interface_type(block_type
);
7593 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7594 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7596 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7597 * The UBO declaration itself doesn't get an ir_variable unless it
7598 * has an instance name. This is ugly.
7600 if (this->layout
.flags
.q
.explicit_binding
) {
7601 apply_explicit_binding(state
, &loc
, var
,
7602 var
->get_interface_type(), &this->layout
);
7605 if (var
->type
->is_unsized_array()) {
7606 if (var
->is_in_shader_storage_block()) {
7607 if (is_unsized_array_last_element(var
)) {
7608 var
->data
.from_ssbo_unsized_array
= true;
7613 state
->symbols
->add_variable(var
);
7614 instructions
->push_tail(var
);
7617 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7618 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7620 * It is also a compilation error ... to redeclare a built-in
7621 * block and then use a member from that built-in block that was
7622 * not included in the redeclaration.
7624 * This appears to be a clarification to the behaviour established
7625 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7626 * behaviour regardless of GLSL version.
7628 * To prevent the shader from using a member that was not included in
7629 * the redeclaration, we disable any ir_variables that are still
7630 * associated with the old declaration of gl_PerVertex (since we've
7631 * already updated all of the variables contained in the new
7632 * gl_PerVertex to point to it).
7634 * As a side effect this will prevent
7635 * validate_intrastage_interface_blocks() from getting confused and
7636 * thinking there are conflicting definitions of gl_PerVertex in the
7639 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7640 ir_variable
*const var
= node
->as_variable();
7642 var
->get_interface_type() == earlier_per_vertex
&&
7643 var
->data
.mode
== var_mode
) {
7644 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7645 _mesa_glsl_error(&loc
, state
,
7646 "redeclaration of gl_PerVertex cannot "
7647 "follow a redeclaration of `%s'",
7650 state
->symbols
->disable_variable(var
->name
);
7662 ast_tcs_output_layout::hir(exec_list
*instructions
,
7663 struct _mesa_glsl_parse_state
*state
)
7665 YYLTYPE loc
= this->get_location();
7667 unsigned num_vertices
;
7668 if (!state
->out_qualifier
->vertices
->
7669 process_qualifier_constant(state
, "vertices", &num_vertices
,
7671 /* return here to stop cascading incorrect error messages */
7675 /* If any shader outputs occurred before this declaration and specified an
7676 * array size, make sure the size they specified is consistent with the
7679 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7680 _mesa_glsl_error(&loc
, state
,
7681 "this tessellation control shader output layout "
7682 "specifies %u vertices, but a previous output "
7683 "is declared with size %u",
7684 num_vertices
, state
->tcs_output_size
);
7688 state
->tcs_output_vertices_specified
= true;
7690 /* If any shader outputs occurred before this declaration and did not
7691 * specify an array size, their size is determined now.
7693 foreach_in_list (ir_instruction
, node
, instructions
) {
7694 ir_variable
*var
= node
->as_variable();
7695 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7698 /* Note: Not all tessellation control shader output are arrays. */
7699 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7702 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7703 _mesa_glsl_error(&loc
, state
,
7704 "this tessellation control shader output layout "
7705 "specifies %u vertices, but an access to element "
7706 "%u of output `%s' already exists", num_vertices
,
7707 var
->data
.max_array_access
, var
->name
);
7709 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7719 ast_gs_input_layout::hir(exec_list
*instructions
,
7720 struct _mesa_glsl_parse_state
*state
)
7722 YYLTYPE loc
= this->get_location();
7724 /* If any geometry input layout declaration preceded this one, make sure it
7725 * was consistent with this one.
7727 if (state
->gs_input_prim_type_specified
&&
7728 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7729 _mesa_glsl_error(&loc
, state
,
7730 "geometry shader input layout does not match"
7731 " previous declaration");
7735 /* If any shader inputs occurred before this declaration and specified an
7736 * array size, make sure the size they specified is consistent with the
7739 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7740 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7741 _mesa_glsl_error(&loc
, state
,
7742 "this geometry shader input layout implies %u vertices"
7743 " per primitive, but a previous input is declared"
7744 " with size %u", num_vertices
, state
->gs_input_size
);
7748 state
->gs_input_prim_type_specified
= true;
7750 /* If any shader inputs occurred before this declaration and did not
7751 * specify an array size, their size is determined now.
7753 foreach_in_list(ir_instruction
, node
, instructions
) {
7754 ir_variable
*var
= node
->as_variable();
7755 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7758 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7762 if (var
->type
->is_unsized_array()) {
7763 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7764 _mesa_glsl_error(&loc
, state
,
7765 "this geometry shader input layout implies %u"
7766 " vertices, but an access to element %u of input"
7767 " `%s' already exists", num_vertices
,
7768 var
->data
.max_array_access
, var
->name
);
7770 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7781 ast_cs_input_layout::hir(exec_list
*instructions
,
7782 struct _mesa_glsl_parse_state
*state
)
7784 YYLTYPE loc
= this->get_location();
7786 /* From the ARB_compute_shader specification:
7788 * If the local size of the shader in any dimension is greater
7789 * than the maximum size supported by the implementation for that
7790 * dimension, a compile-time error results.
7792 * It is not clear from the spec how the error should be reported if
7793 * the total size of the work group exceeds
7794 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7795 * report it at compile time as well.
7797 GLuint64 total_invocations
= 1;
7798 unsigned qual_local_size
[3];
7799 for (int i
= 0; i
< 3; i
++) {
7801 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7803 /* Infer a local_size of 1 for unspecified dimensions */
7804 if (this->local_size
[i
] == NULL
) {
7805 qual_local_size
[i
] = 1;
7806 } else if (!this->local_size
[i
]->
7807 process_qualifier_constant(state
, local_size_str
,
7808 &qual_local_size
[i
], false)) {
7809 ralloc_free(local_size_str
);
7812 ralloc_free(local_size_str
);
7814 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7815 _mesa_glsl_error(&loc
, state
,
7816 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7818 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7821 total_invocations
*= qual_local_size
[i
];
7822 if (total_invocations
>
7823 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7824 _mesa_glsl_error(&loc
, state
,
7825 "product of local_sizes exceeds "
7826 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7827 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7832 /* If any compute input layout declaration preceded this one, make sure it
7833 * was consistent with this one.
7835 if (state
->cs_input_local_size_specified
) {
7836 for (int i
= 0; i
< 3; i
++) {
7837 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7838 _mesa_glsl_error(&loc
, state
,
7839 "compute shader input layout does not match"
7840 " previous declaration");
7846 state
->cs_input_local_size_specified
= true;
7847 for (int i
= 0; i
< 3; i
++)
7848 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7850 /* We may now declare the built-in constant gl_WorkGroupSize (see
7851 * builtin_variable_generator::generate_constants() for why we didn't
7852 * declare it earlier).
7854 ir_variable
*var
= new(state
->symbols
)
7855 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7856 var
->data
.how_declared
= ir_var_declared_implicitly
;
7857 var
->data
.read_only
= true;
7858 instructions
->push_tail(var
);
7859 state
->symbols
->add_variable(var
);
7860 ir_constant_data data
;
7861 memset(&data
, 0, sizeof(data
));
7862 for (int i
= 0; i
< 3; i
++)
7863 data
.u
[i
] = qual_local_size
[i
];
7864 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7865 var
->constant_initializer
=
7866 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7867 var
->data
.has_initializer
= true;
7874 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7875 exec_list
*instructions
)
7877 bool gl_FragColor_assigned
= false;
7878 bool gl_FragData_assigned
= false;
7879 bool gl_FragSecondaryColor_assigned
= false;
7880 bool gl_FragSecondaryData_assigned
= false;
7881 bool user_defined_fs_output_assigned
= false;
7882 ir_variable
*user_defined_fs_output
= NULL
;
7884 /* It would be nice to have proper location information. */
7886 memset(&loc
, 0, sizeof(loc
));
7888 foreach_in_list(ir_instruction
, node
, instructions
) {
7889 ir_variable
*var
= node
->as_variable();
7891 if (!var
|| !var
->data
.assigned
)
7894 if (strcmp(var
->name
, "gl_FragColor") == 0)
7895 gl_FragColor_assigned
= true;
7896 else if (strcmp(var
->name
, "gl_FragData") == 0)
7897 gl_FragData_assigned
= true;
7898 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7899 gl_FragSecondaryColor_assigned
= true;
7900 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7901 gl_FragSecondaryData_assigned
= true;
7902 else if (!is_gl_identifier(var
->name
)) {
7903 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7904 var
->data
.mode
== ir_var_shader_out
) {
7905 user_defined_fs_output_assigned
= true;
7906 user_defined_fs_output
= var
;
7911 /* From the GLSL 1.30 spec:
7913 * "If a shader statically assigns a value to gl_FragColor, it
7914 * may not assign a value to any element of gl_FragData. If a
7915 * shader statically writes a value to any element of
7916 * gl_FragData, it may not assign a value to
7917 * gl_FragColor. That is, a shader may assign values to either
7918 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7919 * linked together must also consistently write just one of
7920 * these variables. Similarly, if user declared output
7921 * variables are in use (statically assigned to), then the
7922 * built-in variables gl_FragColor and gl_FragData may not be
7923 * assigned to. These incorrect usages all generate compile
7926 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7927 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7928 "`gl_FragColor' and `gl_FragData'");
7929 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7930 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7931 "`gl_FragColor' and `%s'",
7932 user_defined_fs_output
->name
);
7933 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7934 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7935 "`gl_FragSecondaryColorEXT' and"
7936 " `gl_FragSecondaryDataEXT'");
7937 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7938 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7939 "`gl_FragColor' and"
7940 " `gl_FragSecondaryDataEXT'");
7941 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7942 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7944 " `gl_FragSecondaryColorEXT'");
7945 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7946 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7947 "`gl_FragData' and `%s'",
7948 user_defined_fs_output
->name
);
7951 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7952 !state
->EXT_blend_func_extended_enable
) {
7953 _mesa_glsl_error(&loc
, state
,
7954 "Dual source blending requires EXT_blend_func_extended");
7960 remove_per_vertex_blocks(exec_list
*instructions
,
7961 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7963 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7964 * if it exists in this shader type.
7966 const glsl_type
*per_vertex
= NULL
;
7968 case ir_var_shader_in
:
7969 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7970 per_vertex
= gl_in
->get_interface_type();
7972 case ir_var_shader_out
:
7973 if (ir_variable
*gl_Position
=
7974 state
->symbols
->get_variable("gl_Position")) {
7975 per_vertex
= gl_Position
->get_interface_type();
7979 assert(!"Unexpected mode");
7983 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7984 * need to do anything.
7986 if (per_vertex
== NULL
)
7989 /* If the interface block is used by the shader, then we don't need to do
7992 interface_block_usage_visitor
v(mode
, per_vertex
);
7993 v
.run(instructions
);
7994 if (v
.usage_found())
7997 /* Remove any ir_variable declarations that refer to the interface block
8000 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8001 ir_variable
*const var
= node
->as_variable();
8002 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8003 var
->data
.mode
== mode
) {
8004 state
->symbols
->disable_variable(var
->name
);