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
>= unsigned(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_function_expression::hir_no_rvalue(exec_list
*instructions
,
1058 struct _mesa_glsl_parse_state
*state
)
1060 (void)hir(instructions
, state
);
1064 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1065 struct _mesa_glsl_parse_state
*state
)
1067 (void)hir(instructions
, state
);
1071 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1074 ir_rvalue
*cmp
= NULL
;
1076 if (operation
== ir_binop_all_equal
)
1077 join_op
= ir_binop_logic_and
;
1079 join_op
= ir_binop_logic_or
;
1081 switch (op0
->type
->base_type
) {
1082 case GLSL_TYPE_FLOAT
:
1083 case GLSL_TYPE_UINT
:
1085 case GLSL_TYPE_BOOL
:
1086 case GLSL_TYPE_DOUBLE
:
1087 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1089 case GLSL_TYPE_ARRAY
: {
1090 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1091 ir_rvalue
*e0
, *e1
, *result
;
1093 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1094 new(mem_ctx
) ir_constant(i
));
1095 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1096 new(mem_ctx
) ir_constant(i
));
1097 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1100 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1106 mark_whole_array_access(op0
);
1107 mark_whole_array_access(op1
);
1111 case GLSL_TYPE_STRUCT
: {
1112 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1113 ir_rvalue
*e0
, *e1
, *result
;
1114 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1116 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1118 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1120 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1123 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1131 case GLSL_TYPE_ERROR
:
1132 case GLSL_TYPE_VOID
:
1133 case GLSL_TYPE_SAMPLER
:
1134 case GLSL_TYPE_IMAGE
:
1135 case GLSL_TYPE_INTERFACE
:
1136 case GLSL_TYPE_ATOMIC_UINT
:
1137 case GLSL_TYPE_SUBROUTINE
:
1138 case GLSL_TYPE_FUNCTION
:
1139 /* I assume a comparison of a struct containing a sampler just
1140 * ignores the sampler present in the type.
1146 cmp
= new(mem_ctx
) ir_constant(true);
1151 /* For logical operations, we want to ensure that the operands are
1152 * scalar booleans. If it isn't, emit an error and return a constant
1153 * boolean to avoid triggering cascading error messages.
1156 get_scalar_boolean_operand(exec_list
*instructions
,
1157 struct _mesa_glsl_parse_state
*state
,
1158 ast_expression
*parent_expr
,
1160 const char *operand_name
,
1161 bool *error_emitted
)
1163 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1165 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1167 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1170 if (!*error_emitted
) {
1171 YYLTYPE loc
= expr
->get_location();
1172 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1174 parent_expr
->operator_string(parent_expr
->oper
));
1175 *error_emitted
= true;
1178 return new(ctx
) ir_constant(true);
1182 * If name refers to a builtin array whose maximum allowed size is less than
1183 * size, report an error and return true. Otherwise return false.
1186 check_builtin_array_max_size(const char *name
, unsigned size
,
1187 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1189 if ((strcmp("gl_TexCoord", name
) == 0)
1190 && (size
> state
->Const
.MaxTextureCoords
)) {
1191 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1193 * "The size [of gl_TexCoord] can be at most
1194 * gl_MaxTextureCoords."
1196 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1197 "be larger than gl_MaxTextureCoords (%u)",
1198 state
->Const
.MaxTextureCoords
);
1199 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1200 state
->clip_dist_size
= size
;
1201 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1202 /* From section 7.1 (Vertex Shader Special Variables) of the
1205 * "The gl_ClipDistance array is predeclared as unsized and
1206 * must be sized by the shader either redeclaring it with a
1207 * size or indexing it only with integral constant
1208 * expressions. ... The size can be at most
1209 * gl_MaxClipDistances."
1211 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1212 "be larger than gl_MaxClipDistances (%u)",
1213 state
->Const
.MaxClipPlanes
);
1215 } else if (strcmp("gl_CullDistance", name
) == 0) {
1216 state
->cull_dist_size
= size
;
1217 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1218 /* From the ARB_cull_distance spec:
1220 * "The gl_CullDistance array is predeclared as unsized and
1221 * must be sized by the shader either redeclaring it with
1222 * a size or indexing it only with integral constant
1223 * expressions. The size determines the number and set of
1224 * enabled cull distances and can be at most
1225 * gl_MaxCullDistances."
1227 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1228 "be larger than gl_MaxCullDistances (%u)",
1229 state
->Const
.MaxClipPlanes
);
1235 * Create the constant 1, of a which is appropriate for incrementing and
1236 * decrementing values of the given GLSL type. For example, if type is vec4,
1237 * this creates a constant value of 1.0 having type float.
1239 * If the given type is invalid for increment and decrement operators, return
1240 * a floating point 1--the error will be detected later.
1243 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1245 switch (type
->base_type
) {
1246 case GLSL_TYPE_UINT
:
1247 return new(ctx
) ir_constant((unsigned) 1);
1249 return new(ctx
) ir_constant(1);
1251 case GLSL_TYPE_FLOAT
:
1252 return new(ctx
) ir_constant(1.0f
);
1257 ast_expression::hir(exec_list
*instructions
,
1258 struct _mesa_glsl_parse_state
*state
)
1260 return do_hir(instructions
, state
, true);
1264 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1265 struct _mesa_glsl_parse_state
*state
)
1267 do_hir(instructions
, state
, false);
1271 ast_expression::set_is_lhs(bool new_value
)
1273 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1274 * if we lack a identifier we can just skip it.
1276 if (this->primary_expression
.identifier
== NULL
)
1279 this->is_lhs
= new_value
;
1281 /* We need to go through the subexpressions tree to cover cases like
1282 * ast_field_selection
1284 if (this->subexpressions
[0] != NULL
)
1285 this->subexpressions
[0]->set_is_lhs(new_value
);
1289 ast_expression::do_hir(exec_list
*instructions
,
1290 struct _mesa_glsl_parse_state
*state
,
1294 static const int operations
[AST_NUM_OPERATORS
] = {
1295 -1, /* ast_assign doesn't convert to ir_expression. */
1296 -1, /* ast_plus doesn't convert to ir_expression. */
1310 ir_binop_any_nequal
,
1320 /* Note: The following block of expression types actually convert
1321 * to multiple IR instructions.
1323 ir_binop_mul
, /* ast_mul_assign */
1324 ir_binop_div
, /* ast_div_assign */
1325 ir_binop_mod
, /* ast_mod_assign */
1326 ir_binop_add
, /* ast_add_assign */
1327 ir_binop_sub
, /* ast_sub_assign */
1328 ir_binop_lshift
, /* ast_ls_assign */
1329 ir_binop_rshift
, /* ast_rs_assign */
1330 ir_binop_bit_and
, /* ast_and_assign */
1331 ir_binop_bit_xor
, /* ast_xor_assign */
1332 ir_binop_bit_or
, /* ast_or_assign */
1334 -1, /* ast_conditional doesn't convert to ir_expression. */
1335 ir_binop_add
, /* ast_pre_inc. */
1336 ir_binop_sub
, /* ast_pre_dec. */
1337 ir_binop_add
, /* ast_post_inc. */
1338 ir_binop_sub
, /* ast_post_dec. */
1339 -1, /* ast_field_selection doesn't conv to ir_expression. */
1340 -1, /* ast_array_index doesn't convert to ir_expression. */
1341 -1, /* ast_function_call doesn't conv to ir_expression. */
1342 -1, /* ast_identifier doesn't convert to ir_expression. */
1343 -1, /* ast_int_constant doesn't convert to ir_expression. */
1344 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1345 -1, /* ast_float_constant doesn't conv to ir_expression. */
1346 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1347 -1, /* ast_sequence doesn't convert to ir_expression. */
1349 ir_rvalue
*result
= NULL
;
1351 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1352 bool error_emitted
= false;
1355 loc
= this->get_location();
1357 switch (this->oper
) {
1359 assert(!"ast_aggregate: Should never get here.");
1363 this->subexpressions
[0]->set_is_lhs(true);
1364 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1365 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1368 do_assignment(instructions
, state
,
1369 this->subexpressions
[0]->non_lvalue_description
,
1370 op
[0], op
[1], &result
, needs_rvalue
, false,
1371 this->subexpressions
[0]->get_location());
1376 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1378 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1380 error_emitted
= type
->is_error();
1386 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1388 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1390 error_emitted
= type
->is_error();
1392 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1400 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1401 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1403 type
= arithmetic_result_type(op
[0], op
[1],
1404 (this->oper
== ast_mul
),
1406 error_emitted
= type
->is_error();
1408 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1413 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1414 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1416 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1418 assert(operations
[this->oper
] == ir_binop_mod
);
1420 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1422 error_emitted
= type
->is_error();
1427 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1428 error_emitted
= true;
1431 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1432 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1433 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1435 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1437 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1444 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1445 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1447 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1449 /* The relational operators must either generate an error or result
1450 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1452 assert(type
->is_error()
1453 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1454 && type
->is_scalar()));
1456 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1458 error_emitted
= type
->is_error();
1463 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1464 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1466 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1468 * "The equality operators equal (==), and not equal (!=)
1469 * operate on all types. They result in a scalar Boolean. If
1470 * the operand types do not match, then there must be a
1471 * conversion from Section 4.1.10 "Implicit Conversions"
1472 * applied to one operand that can make them match, in which
1473 * case this conversion is done."
1476 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1477 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1478 "no operation `%1$s' exists that takes a left-hand "
1479 "operand of type 'void' or a right operand of type "
1480 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1481 error_emitted
= true;
1482 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1483 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1484 || (op
[0]->type
!= op
[1]->type
)) {
1485 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1486 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1487 error_emitted
= true;
1488 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1489 !state
->check_version(120, 300, &loc
,
1490 "array comparisons forbidden")) {
1491 error_emitted
= true;
1492 } else if ((op
[0]->type
->contains_opaque() ||
1493 op
[1]->type
->contains_opaque())) {
1494 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1495 error_emitted
= true;
1498 if (error_emitted
) {
1499 result
= new(ctx
) ir_constant(false);
1501 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1502 assert(result
->type
== glsl_type::bool_type
);
1509 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1510 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1511 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1512 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1514 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1518 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1520 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1521 error_emitted
= true;
1524 if (!op
[0]->type
->is_integer()) {
1525 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1526 error_emitted
= true;
1529 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1530 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1533 case ast_logic_and
: {
1534 exec_list rhs_instructions
;
1535 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1536 "LHS", &error_emitted
);
1537 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1538 "RHS", &error_emitted
);
1540 if (rhs_instructions
.is_empty()) {
1541 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1542 type
= result
->type
;
1544 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1547 instructions
->push_tail(tmp
);
1549 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1550 instructions
->push_tail(stmt
);
1552 stmt
->then_instructions
.append_list(&rhs_instructions
);
1553 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1554 ir_assignment
*const then_assign
=
1555 new(ctx
) ir_assignment(then_deref
, op
[1]);
1556 stmt
->then_instructions
.push_tail(then_assign
);
1558 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1559 ir_assignment
*const else_assign
=
1560 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1561 stmt
->else_instructions
.push_tail(else_assign
);
1563 result
= new(ctx
) ir_dereference_variable(tmp
);
1569 case ast_logic_or
: {
1570 exec_list rhs_instructions
;
1571 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1572 "LHS", &error_emitted
);
1573 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1574 "RHS", &error_emitted
);
1576 if (rhs_instructions
.is_empty()) {
1577 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1578 type
= result
->type
;
1580 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1583 instructions
->push_tail(tmp
);
1585 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1586 instructions
->push_tail(stmt
);
1588 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1589 ir_assignment
*const then_assign
=
1590 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1591 stmt
->then_instructions
.push_tail(then_assign
);
1593 stmt
->else_instructions
.append_list(&rhs_instructions
);
1594 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1595 ir_assignment
*const else_assign
=
1596 new(ctx
) ir_assignment(else_deref
, op
[1]);
1597 stmt
->else_instructions
.push_tail(else_assign
);
1599 result
= new(ctx
) ir_dereference_variable(tmp
);
1606 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1608 * "The logical binary operators and (&&), or ( | | ), and
1609 * exclusive or (^^). They operate only on two Boolean
1610 * expressions and result in a Boolean expression."
1612 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1614 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1617 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1622 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1623 "operand", &error_emitted
);
1625 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1629 case ast_mul_assign
:
1630 case ast_div_assign
:
1631 case ast_add_assign
:
1632 case ast_sub_assign
: {
1633 this->subexpressions
[0]->set_is_lhs(true);
1634 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1635 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1637 type
= arithmetic_result_type(op
[0], op
[1],
1638 (this->oper
== ast_mul_assign
),
1641 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1645 do_assignment(instructions
, state
,
1646 this->subexpressions
[0]->non_lvalue_description
,
1647 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1648 &result
, needs_rvalue
, false,
1649 this->subexpressions
[0]->get_location());
1651 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1652 * explicitly test for this because none of the binary expression
1653 * operators allow array operands either.
1659 case ast_mod_assign
: {
1660 this->subexpressions
[0]->set_is_lhs(true);
1661 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1662 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1664 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1666 assert(operations
[this->oper
] == ir_binop_mod
);
1668 ir_rvalue
*temp_rhs
;
1669 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1673 do_assignment(instructions
, state
,
1674 this->subexpressions
[0]->non_lvalue_description
,
1675 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1676 &result
, needs_rvalue
, false,
1677 this->subexpressions
[0]->get_location());
1682 case ast_rs_assign
: {
1683 this->subexpressions
[0]->set_is_lhs(true);
1684 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1685 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1686 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1688 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1689 type
, op
[0], op
[1]);
1691 do_assignment(instructions
, state
,
1692 this->subexpressions
[0]->non_lvalue_description
,
1693 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1694 &result
, needs_rvalue
, false,
1695 this->subexpressions
[0]->get_location());
1699 case ast_and_assign
:
1700 case ast_xor_assign
:
1701 case ast_or_assign
: {
1702 this->subexpressions
[0]->set_is_lhs(true);
1703 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1704 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1705 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1706 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1707 type
, op
[0], op
[1]);
1709 do_assignment(instructions
, state
,
1710 this->subexpressions
[0]->non_lvalue_description
,
1711 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1712 &result
, needs_rvalue
, false,
1713 this->subexpressions
[0]->get_location());
1717 case ast_conditional
: {
1718 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1720 * "The ternary selection operator (?:). It operates on three
1721 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1722 * first expression, which must result in a scalar Boolean."
1724 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1725 "condition", &error_emitted
);
1727 /* The :? operator is implemented by generating an anonymous temporary
1728 * followed by an if-statement. The last instruction in each branch of
1729 * the if-statement assigns a value to the anonymous temporary. This
1730 * temporary is the r-value of the expression.
1732 exec_list then_instructions
;
1733 exec_list else_instructions
;
1735 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1736 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1738 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1740 * "The second and third expressions can be any type, as
1741 * long their types match, or there is a conversion in
1742 * Section 4.1.10 "Implicit Conversions" that can be applied
1743 * to one of the expressions to make their types match. This
1744 * resulting matching type is the type of the entire
1747 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1748 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1749 || (op
[1]->type
!= op
[2]->type
)) {
1750 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1752 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1753 "operator must have matching types");
1754 error_emitted
= true;
1755 type
= glsl_type::error_type
;
1760 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1762 * "The second and third expressions must be the same type, but can
1763 * be of any type other than an array."
1765 if (type
->is_array() &&
1766 !state
->check_version(120, 300, &loc
,
1767 "second and third operands of ?: operator "
1768 "cannot be arrays")) {
1769 error_emitted
= true;
1772 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1774 * "Except for array indexing, structure member selection, and
1775 * parentheses, opaque variables are not allowed to be operands in
1776 * expressions; such use results in a compile-time error."
1778 if (type
->contains_opaque()) {
1779 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1780 "of the ?: operator");
1781 error_emitted
= true;
1784 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1786 if (then_instructions
.is_empty()
1787 && else_instructions
.is_empty()
1788 && cond_val
!= NULL
) {
1789 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1791 /* The copy to conditional_tmp reads the whole array. */
1792 if (type
->is_array()) {
1793 mark_whole_array_access(op
[1]);
1794 mark_whole_array_access(op
[2]);
1797 ir_variable
*const tmp
=
1798 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1799 instructions
->push_tail(tmp
);
1801 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1802 instructions
->push_tail(stmt
);
1804 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1805 ir_dereference
*const then_deref
=
1806 new(ctx
) ir_dereference_variable(tmp
);
1807 ir_assignment
*const then_assign
=
1808 new(ctx
) ir_assignment(then_deref
, op
[1]);
1809 stmt
->then_instructions
.push_tail(then_assign
);
1811 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1812 ir_dereference
*const else_deref
=
1813 new(ctx
) ir_dereference_variable(tmp
);
1814 ir_assignment
*const else_assign
=
1815 new(ctx
) ir_assignment(else_deref
, op
[2]);
1816 stmt
->else_instructions
.push_tail(else_assign
);
1818 result
= new(ctx
) ir_dereference_variable(tmp
);
1825 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1826 ? "pre-increment operation" : "pre-decrement operation";
1828 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1829 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1831 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1833 ir_rvalue
*temp_rhs
;
1834 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1838 do_assignment(instructions
, state
,
1839 this->subexpressions
[0]->non_lvalue_description
,
1840 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1841 &result
, needs_rvalue
, false,
1842 this->subexpressions
[0]->get_location());
1847 case ast_post_dec
: {
1848 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1849 ? "post-increment operation" : "post-decrement operation";
1850 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1851 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1853 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1855 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1857 ir_rvalue
*temp_rhs
;
1858 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1861 /* Get a temporary of a copy of the lvalue before it's modified.
1862 * This may get thrown away later.
1864 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1866 ir_rvalue
*junk_rvalue
;
1868 do_assignment(instructions
, state
,
1869 this->subexpressions
[0]->non_lvalue_description
,
1870 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1871 &junk_rvalue
, false, false,
1872 this->subexpressions
[0]->get_location());
1877 case ast_field_selection
:
1878 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1881 case ast_array_index
: {
1882 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1884 /* Getting if an array is being used uninitialized is beyond what we get
1885 * from ir_value.data.assigned. Setting is_lhs as true would force to
1886 * not raise a uninitialized warning when using an array
1888 subexpressions
[0]->set_is_lhs(true);
1889 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1890 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1892 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1895 if (result
->type
->is_error())
1896 error_emitted
= true;
1901 case ast_unsized_array_dim
:
1902 assert(!"ast_unsized_array_dim: Should never get here.");
1905 case ast_function_call
:
1906 /* Should *NEVER* get here. ast_function_call should always be handled
1907 * by ast_function_expression::hir.
1912 case ast_identifier
: {
1913 /* ast_identifier can appear several places in a full abstract syntax
1914 * tree. This particular use must be at location specified in the grammar
1915 * as 'variable_identifier'.
1918 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1921 var
->data
.used
= true;
1922 result
= new(ctx
) ir_dereference_variable(var
);
1924 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
1926 && result
->variable_referenced()->data
.assigned
!= true
1927 && !is_gl_identifier(var
->name
)) {
1928 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
1929 this->primary_expression
.identifier
);
1932 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1933 this->primary_expression
.identifier
);
1935 result
= ir_rvalue::error_value(ctx
);
1936 error_emitted
= true;
1941 case ast_int_constant
:
1942 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1945 case ast_uint_constant
:
1946 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1949 case ast_float_constant
:
1950 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1953 case ast_bool_constant
:
1954 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1957 case ast_double_constant
:
1958 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1961 case ast_sequence
: {
1962 /* It should not be possible to generate a sequence in the AST without
1963 * any expressions in it.
1965 assert(!this->expressions
.is_empty());
1967 /* The r-value of a sequence is the last expression in the sequence. If
1968 * the other expressions in the sequence do not have side-effects (and
1969 * therefore add instructions to the instruction list), they get dropped
1972 exec_node
*previous_tail_pred
= NULL
;
1973 YYLTYPE previous_operand_loc
= loc
;
1975 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1976 /* If one of the operands of comma operator does not generate any
1977 * code, we want to emit a warning. At each pass through the loop
1978 * previous_tail_pred will point to the last instruction in the
1979 * stream *before* processing the previous operand. Naturally,
1980 * instructions->tail_pred will point to the last instruction in the
1981 * stream *after* processing the previous operand. If the two
1982 * pointers match, then the previous operand had no effect.
1984 * The warning behavior here differs slightly from GCC. GCC will
1985 * only emit a warning if none of the left-hand operands have an
1986 * effect. However, it will emit a warning for each. I believe that
1987 * there are some cases in C (especially with GCC extensions) where
1988 * it is useful to have an intermediate step in a sequence have no
1989 * effect, but I don't think these cases exist in GLSL. Either way,
1990 * it would be a giant hassle to replicate that behavior.
1992 if (previous_tail_pred
== instructions
->tail_pred
) {
1993 _mesa_glsl_warning(&previous_operand_loc
, state
,
1994 "left-hand operand of comma expression has "
1998 /* tail_pred is directly accessed instead of using the get_tail()
1999 * method for performance reasons. get_tail() has extra code to
2000 * return NULL when the list is empty. We don't care about that
2001 * here, so using tail_pred directly is fine.
2003 previous_tail_pred
= instructions
->tail_pred
;
2004 previous_operand_loc
= ast
->get_location();
2006 result
= ast
->hir(instructions
, state
);
2009 /* Any errors should have already been emitted in the loop above.
2011 error_emitted
= true;
2015 type
= NULL
; /* use result->type, not type. */
2016 assert(result
!= NULL
|| !needs_rvalue
);
2018 if (result
&& result
->type
->is_error() && !error_emitted
)
2019 _mesa_glsl_error(& loc
, state
, "type mismatch");
2025 ast_expression::has_sequence_subexpression() const
2027 switch (this->oper
) {
2036 return this->subexpressions
[0]->has_sequence_subexpression();
2058 case ast_array_index
:
2059 case ast_mul_assign
:
2060 case ast_div_assign
:
2061 case ast_add_assign
:
2062 case ast_sub_assign
:
2063 case ast_mod_assign
:
2066 case ast_and_assign
:
2067 case ast_xor_assign
:
2069 return this->subexpressions
[0]->has_sequence_subexpression() ||
2070 this->subexpressions
[1]->has_sequence_subexpression();
2072 case ast_conditional
:
2073 return this->subexpressions
[0]->has_sequence_subexpression() ||
2074 this->subexpressions
[1]->has_sequence_subexpression() ||
2075 this->subexpressions
[2]->has_sequence_subexpression();
2080 case ast_field_selection
:
2081 case ast_identifier
:
2082 case ast_int_constant
:
2083 case ast_uint_constant
:
2084 case ast_float_constant
:
2085 case ast_bool_constant
:
2086 case ast_double_constant
:
2090 unreachable("ast_aggregate: Should never get here.");
2092 case ast_function_call
:
2093 unreachable("should be handled by ast_function_expression::hir");
2095 case ast_unsized_array_dim
:
2096 unreachable("ast_unsized_array_dim: Should never get here.");
2103 ast_expression_statement::hir(exec_list
*instructions
,
2104 struct _mesa_glsl_parse_state
*state
)
2106 /* It is possible to have expression statements that don't have an
2107 * expression. This is the solitary semicolon:
2109 * for (i = 0; i < 5; i++)
2112 * In this case the expression will be NULL. Test for NULL and don't do
2113 * anything in that case.
2115 if (expression
!= NULL
)
2116 expression
->hir_no_rvalue(instructions
, state
);
2118 /* Statements do not have r-values.
2125 ast_compound_statement::hir(exec_list
*instructions
,
2126 struct _mesa_glsl_parse_state
*state
)
2129 state
->symbols
->push_scope();
2131 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2132 ast
->hir(instructions
, state
);
2135 state
->symbols
->pop_scope();
2137 /* Compound statements do not have r-values.
2143 * Evaluate the given exec_node (which should be an ast_node representing
2144 * a single array dimension) and return its integer value.
2147 process_array_size(exec_node
*node
,
2148 struct _mesa_glsl_parse_state
*state
)
2150 exec_list dummy_instructions
;
2152 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2155 * Dimensions other than the outermost dimension can by unsized if they
2156 * are immediately sized by a constructor or initializer.
2158 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2161 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2162 YYLTYPE loc
= array_size
->get_location();
2165 _mesa_glsl_error(& loc
, state
,
2166 "array size could not be resolved");
2170 if (!ir
->type
->is_integer()) {
2171 _mesa_glsl_error(& loc
, state
,
2172 "array size must be integer type");
2176 if (!ir
->type
->is_scalar()) {
2177 _mesa_glsl_error(& loc
, state
,
2178 "array size must be scalar type");
2182 ir_constant
*const size
= ir
->constant_expression_value();
2184 (state
->is_version(120, 300) &&
2185 array_size
->has_sequence_subexpression())) {
2186 _mesa_glsl_error(& loc
, state
, "array size must be a "
2187 "constant valued expression");
2191 if (size
->value
.i
[0] <= 0) {
2192 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2196 assert(size
->type
== ir
->type
);
2198 /* If the array size is const (and we've verified that
2199 * it is) then no instructions should have been emitted
2200 * when we converted it to HIR. If they were emitted,
2201 * then either the array size isn't const after all, or
2202 * we are emitting unnecessary instructions.
2204 assert(dummy_instructions
.is_empty());
2206 return size
->value
.u
[0];
2209 static const glsl_type
*
2210 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2211 ast_array_specifier
*array_specifier
,
2212 struct _mesa_glsl_parse_state
*state
)
2214 const glsl_type
*array_type
= base
;
2216 if (array_specifier
!= NULL
) {
2217 if (base
->is_array()) {
2219 /* From page 19 (page 25) of the GLSL 1.20 spec:
2221 * "Only one-dimensional arrays may be declared."
2223 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2224 return glsl_type::error_type
;
2228 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2229 !node
->is_head_sentinel(); node
= node
->prev
) {
2230 unsigned array_size
= process_array_size(node
, state
);
2231 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2239 precision_qualifier_allowed(const glsl_type
*type
)
2241 /* Precision qualifiers apply to floating point, integer and opaque
2244 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2245 * "Any floating point or any integer declaration can have the type
2246 * preceded by one of these precision qualifiers [...] Literal
2247 * constants do not have precision qualifiers. Neither do Boolean
2250 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2253 * "Precision qualifiers are added for code portability with OpenGL
2254 * ES, not for functionality. They have the same syntax as in OpenGL
2257 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2259 * "uniform lowp sampler2D sampler;
2262 * lowp vec4 col = texture2D (sampler, coord);
2263 * // texture2D returns lowp"
2265 * From this, we infer that GLSL 1.30 (and later) should allow precision
2266 * qualifiers on sampler types just like float and integer types.
2268 return (type
->is_float()
2269 || type
->is_integer()
2270 || type
->contains_opaque())
2271 && !type
->without_array()->is_record();
2275 ast_type_specifier::glsl_type(const char **name
,
2276 struct _mesa_glsl_parse_state
*state
) const
2278 const struct glsl_type
*type
;
2280 type
= state
->symbols
->get_type(this->type_name
);
2281 *name
= this->type_name
;
2283 YYLTYPE loc
= this->get_location();
2284 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2290 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2292 * "The precision statement
2294 * precision precision-qualifier type;
2296 * can be used to establish a default precision qualifier. The type field can
2297 * be either int or float or any of the sampler types, (...) If type is float,
2298 * the directive applies to non-precision-qualified floating point type
2299 * (scalar, vector, and matrix) declarations. If type is int, the directive
2300 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2301 * and unsigned) declarations."
2303 * We use the symbol table to keep the values of the default precisions for
2304 * each 'type' in each scope and we use the 'type' string from the precision
2305 * statement as key in the symbol table. When we want to retrieve the default
2306 * precision associated with a given glsl_type we need to know the type string
2307 * associated with it. This is what this function returns.
2310 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2312 switch (type
->base_type
) {
2313 case GLSL_TYPE_FLOAT
:
2315 case GLSL_TYPE_UINT
:
2318 case GLSL_TYPE_ATOMIC_UINT
:
2319 return "atomic_uint";
2320 case GLSL_TYPE_IMAGE
:
2322 case GLSL_TYPE_SAMPLER
: {
2323 const unsigned type_idx
=
2324 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2325 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2326 assert(type_idx
< 4);
2327 switch (type
->sampled_type
) {
2328 case GLSL_TYPE_FLOAT
:
2329 switch (type
->sampler_dimensionality
) {
2330 case GLSL_SAMPLER_DIM_1D
: {
2331 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2332 static const char *const names
[4] = {
2333 "sampler1D", "sampler1DArray",
2334 "sampler1DShadow", "sampler1DArrayShadow"
2336 return names
[type_idx
];
2338 case GLSL_SAMPLER_DIM_2D
: {
2339 static const char *const names
[8] = {
2340 "sampler2D", "sampler2DArray",
2341 "sampler2DShadow", "sampler2DArrayShadow",
2342 "image2D", "image2DArray", NULL
, NULL
2344 return names
[offset
+ type_idx
];
2346 case GLSL_SAMPLER_DIM_3D
: {
2347 static const char *const names
[8] = {
2348 "sampler3D", NULL
, NULL
, NULL
,
2349 "image3D", NULL
, NULL
, NULL
2351 return names
[offset
+ type_idx
];
2353 case GLSL_SAMPLER_DIM_CUBE
: {
2354 static const char *const names
[8] = {
2355 "samplerCube", "samplerCubeArray",
2356 "samplerCubeShadow", "samplerCubeArrayShadow",
2357 "imageCube", NULL
, NULL
, NULL
2359 return names
[offset
+ type_idx
];
2361 case GLSL_SAMPLER_DIM_MS
: {
2362 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2363 static const char *const names
[4] = {
2364 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2366 return names
[type_idx
];
2368 case GLSL_SAMPLER_DIM_RECT
: {
2369 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2370 static const char *const names
[4] = {
2371 "samplerRect", NULL
, "samplerRectShadow", NULL
2373 return names
[type_idx
];
2375 case GLSL_SAMPLER_DIM_BUF
: {
2376 static const char *const names
[8] = {
2377 "samplerBuffer", NULL
, NULL
, NULL
,
2378 "imageBuffer", NULL
, NULL
, NULL
2380 return names
[offset
+ type_idx
];
2382 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2383 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2384 static const char *const names
[4] = {
2385 "samplerExternalOES", NULL
, NULL
, NULL
2387 return names
[type_idx
];
2390 unreachable("Unsupported sampler/image dimensionality");
2391 } /* sampler/image float dimensionality */
2394 switch (type
->sampler_dimensionality
) {
2395 case GLSL_SAMPLER_DIM_1D
: {
2396 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2397 static const char *const names
[4] = {
2398 "isampler1D", "isampler1DArray", NULL
, NULL
2400 return names
[type_idx
];
2402 case GLSL_SAMPLER_DIM_2D
: {
2403 static const char *const names
[8] = {
2404 "isampler2D", "isampler2DArray", NULL
, NULL
,
2405 "iimage2D", "iimage2DArray", NULL
, NULL
2407 return names
[offset
+ type_idx
];
2409 case GLSL_SAMPLER_DIM_3D
: {
2410 static const char *const names
[8] = {
2411 "isampler3D", NULL
, NULL
, NULL
,
2412 "iimage3D", NULL
, NULL
, NULL
2414 return names
[offset
+ type_idx
];
2416 case GLSL_SAMPLER_DIM_CUBE
: {
2417 static const char *const names
[8] = {
2418 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2419 "iimageCube", NULL
, NULL
, NULL
2421 return names
[offset
+ type_idx
];
2423 case GLSL_SAMPLER_DIM_MS
: {
2424 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2425 static const char *const names
[4] = {
2426 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2428 return names
[type_idx
];
2430 case GLSL_SAMPLER_DIM_RECT
: {
2431 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2432 static const char *const names
[4] = {
2433 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2435 return names
[type_idx
];
2437 case GLSL_SAMPLER_DIM_BUF
: {
2438 static const char *const names
[8] = {
2439 "isamplerBuffer", NULL
, NULL
, NULL
,
2440 "iimageBuffer", NULL
, NULL
, NULL
2442 return names
[offset
+ type_idx
];
2445 unreachable("Unsupported isampler/iimage dimensionality");
2446 } /* sampler/image int dimensionality */
2448 case GLSL_TYPE_UINT
:
2449 switch (type
->sampler_dimensionality
) {
2450 case GLSL_SAMPLER_DIM_1D
: {
2451 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2452 static const char *const names
[4] = {
2453 "usampler1D", "usampler1DArray", NULL
, NULL
2455 return names
[type_idx
];
2457 case GLSL_SAMPLER_DIM_2D
: {
2458 static const char *const names
[8] = {
2459 "usampler2D", "usampler2DArray", NULL
, NULL
,
2460 "uimage2D", "uimage2DArray", NULL
, NULL
2462 return names
[offset
+ type_idx
];
2464 case GLSL_SAMPLER_DIM_3D
: {
2465 static const char *const names
[8] = {
2466 "usampler3D", NULL
, NULL
, NULL
,
2467 "uimage3D", NULL
, NULL
, NULL
2469 return names
[offset
+ type_idx
];
2471 case GLSL_SAMPLER_DIM_CUBE
: {
2472 static const char *const names
[8] = {
2473 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2474 "uimageCube", NULL
, NULL
, NULL
2476 return names
[offset
+ type_idx
];
2478 case GLSL_SAMPLER_DIM_MS
: {
2479 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2480 static const char *const names
[4] = {
2481 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2483 return names
[type_idx
];
2485 case GLSL_SAMPLER_DIM_RECT
: {
2486 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2487 static const char *const names
[4] = {
2488 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2490 return names
[type_idx
];
2492 case GLSL_SAMPLER_DIM_BUF
: {
2493 static const char *const names
[8] = {
2494 "usamplerBuffer", NULL
, NULL
, NULL
,
2495 "uimageBuffer", NULL
, NULL
, NULL
2497 return names
[offset
+ type_idx
];
2500 unreachable("Unsupported usampler/uimage dimensionality");
2501 } /* sampler/image uint dimensionality */
2504 unreachable("Unsupported sampler/image type");
2505 } /* sampler/image type */
2507 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2510 unreachable("Unsupported type");
2515 select_gles_precision(unsigned qual_precision
,
2516 const glsl_type
*type
,
2517 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2519 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2520 * In GLES we take the precision from the type qualifier if present,
2521 * otherwise, if the type of the variable allows precision qualifiers at
2522 * all, we look for the default precision qualifier for that type in the
2525 assert(state
->es_shader
);
2527 unsigned precision
= GLSL_PRECISION_NONE
;
2528 if (qual_precision
) {
2529 precision
= qual_precision
;
2530 } else if (precision_qualifier_allowed(type
)) {
2531 const char *type_name
=
2532 get_type_name_for_precision_qualifier(type
->without_array());
2533 assert(type_name
!= NULL
);
2536 state
->symbols
->get_default_precision_qualifier(type_name
);
2537 if (precision
== ast_precision_none
) {
2538 _mesa_glsl_error(loc
, state
,
2539 "No precision specified in this scope for type `%s'",
2547 ast_fully_specified_type::glsl_type(const char **name
,
2548 struct _mesa_glsl_parse_state
*state
) const
2550 return this->specifier
->glsl_type(name
, state
);
2554 * Determine whether a toplevel variable declaration declares a varying. This
2555 * function operates by examining the variable's mode and the shader target,
2556 * so it correctly identifies linkage variables regardless of whether they are
2557 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2559 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2560 * this function will produce undefined results.
2563 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2566 case MESA_SHADER_VERTEX
:
2567 return var
->data
.mode
== ir_var_shader_out
;
2568 case MESA_SHADER_FRAGMENT
:
2569 return var
->data
.mode
== ir_var_shader_in
;
2571 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2577 * Matrix layout qualifiers are only allowed on certain types
2580 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2582 const glsl_type
*type
,
2585 if (var
&& !var
->is_in_buffer_block()) {
2586 /* Layout qualifiers may only apply to interface blocks and fields in
2589 _mesa_glsl_error(loc
, state
,
2590 "uniform block layout qualifiers row_major and "
2591 "column_major may not be applied to variables "
2592 "outside of uniform blocks");
2593 } else if (!type
->without_array()->is_matrix()) {
2594 /* The OpenGL ES 3.0 conformance tests did not originally allow
2595 * matrix layout qualifiers on non-matrices. However, the OpenGL
2596 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2597 * amended to specifically allow these layouts on all types. Emit
2598 * a warning so that people know their code may not be portable.
2600 _mesa_glsl_warning(loc
, state
,
2601 "uniform block layout qualifiers row_major and "
2602 "column_major applied to non-matrix types may "
2603 "be rejected by older compilers");
2608 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2609 struct _mesa_glsl_parse_state
*state
,
2610 unsigned xfb_buffer
) {
2611 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2612 _mesa_glsl_error(loc
, state
,
2613 "invalid xfb_buffer specified %d is larger than "
2614 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2616 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2623 /* From the ARB_enhanced_layouts spec:
2625 * "Variables and block members qualified with *xfb_offset* can be
2626 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2627 * The offset must be a multiple of the size of the first component of
2628 * the first qualified variable or block member, or a compile-time error
2629 * results. Further, if applied to an aggregate containing a double,
2630 * the offset must also be a multiple of 8, and the space taken in the
2631 * buffer will be a multiple of 8.
2634 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2635 struct _mesa_glsl_parse_state
*state
,
2636 int xfb_offset
, const glsl_type
*type
,
2637 unsigned component_size
) {
2638 const glsl_type
*t_without_array
= type
->without_array();
2640 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2641 _mesa_glsl_error(loc
, state
,
2642 "xfb_offset can't be used with unsized arrays.");
2646 /* Make sure nested structs don't contain unsized arrays, and validate
2647 * any xfb_offsets on interface members.
2649 if (t_without_array
->is_record() || t_without_array
->is_interface())
2650 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2651 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2653 /* When the interface block doesn't have an xfb_offset qualifier then
2654 * we apply the component size rules at the member level.
2656 if (xfb_offset
== -1)
2657 component_size
= member_t
->contains_double() ? 8 : 4;
2659 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2660 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2664 /* Nested structs or interface block without offset may not have had an
2665 * offset applied yet so return.
2667 if (xfb_offset
== -1) {
2671 if (xfb_offset
% component_size
) {
2672 _mesa_glsl_error(loc
, state
,
2673 "invalid qualifier xfb_offset=%d must be a multiple "
2674 "of the first component size of the first qualified "
2675 "variable or block member. Or double if an aggregate "
2676 "that contains a double (%d).",
2677 xfb_offset
, component_size
);
2685 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2688 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2689 _mesa_glsl_error(loc
, state
,
2690 "invalid stream specified %d is larger than "
2691 "MAX_VERTEX_STREAMS - 1 (%d).",
2692 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2700 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2703 const glsl_type
*type
,
2704 const ast_type_qualifier
*qual
)
2706 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2707 _mesa_glsl_error(loc
, state
,
2708 "the \"binding\" qualifier only applies to uniforms and "
2709 "shader storage buffer objects");
2713 unsigned qual_binding
;
2714 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2719 const struct gl_context
*const ctx
= state
->ctx
;
2720 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2721 unsigned max_index
= qual_binding
+ elements
- 1;
2722 const glsl_type
*base_type
= type
->without_array();
2724 if (base_type
->is_interface()) {
2725 /* UBOs. From page 60 of the GLSL 4.20 specification:
2726 * "If the binding point for any uniform block instance is less than zero,
2727 * or greater than or equal to the implementation-dependent maximum
2728 * number of uniform buffer bindings, a compilation error will occur.
2729 * When the binding identifier is used with a uniform block instanced as
2730 * an array of size N, all elements of the array from binding through
2731 * binding + N – 1 must be within this range."
2733 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2735 if (qual
->flags
.q
.uniform
&&
2736 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2737 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2738 "the maximum number of UBO binding points (%d)",
2739 qual_binding
, elements
,
2740 ctx
->Const
.MaxUniformBufferBindings
);
2744 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2745 * "If the binding point for any uniform or shader storage block instance
2746 * is less than zero, or greater than or equal to the
2747 * implementation-dependent maximum number of uniform buffer bindings, a
2748 * compile-time error will occur. When the binding identifier is used
2749 * with a uniform or shader storage block instanced as an array of size
2750 * N, all elements of the array from binding through binding + N – 1 must
2751 * be within this range."
2753 if (qual
->flags
.q
.buffer
&&
2754 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2755 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2756 "the maximum number of SSBO binding points (%d)",
2757 qual_binding
, elements
,
2758 ctx
->Const
.MaxShaderStorageBufferBindings
);
2761 } else if (base_type
->is_sampler()) {
2762 /* Samplers. From page 63 of the GLSL 4.20 specification:
2763 * "If the binding is less than zero, or greater than or equal to the
2764 * implementation-dependent maximum supported number of units, a
2765 * compilation error will occur. When the binding identifier is used
2766 * with an array of size N, all elements of the array from binding
2767 * through binding + N - 1 must be within this range."
2769 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2771 if (max_index
>= limit
) {
2772 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2773 "exceeds the maximum number of texture image units "
2774 "(%u)", qual_binding
, elements
, limit
);
2778 } else if (base_type
->contains_atomic()) {
2779 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2780 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2781 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2782 " maximum number of atomic counter buffer bindings"
2783 "(%u)", qual_binding
,
2784 ctx
->Const
.MaxAtomicBufferBindings
);
2788 } else if ((state
->is_version(420, 310) ||
2789 state
->ARB_shading_language_420pack_enable
) &&
2790 base_type
->is_image()) {
2791 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2792 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2793 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2794 " maximum number of image units (%d)", max_index
,
2795 ctx
->Const
.MaxImageUnits
);
2800 _mesa_glsl_error(loc
, state
,
2801 "the \"binding\" qualifier only applies to uniform "
2802 "blocks, opaque variables, or arrays thereof");
2806 var
->data
.explicit_binding
= true;
2807 var
->data
.binding
= qual_binding
;
2814 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
2816 const glsl_interp_qualifier interpolation
,
2817 const struct ast_type_qualifier
*qual
,
2818 const struct glsl_type
*var_type
,
2819 ir_variable_mode mode
)
2821 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
2822 * not to vertex shader inputs nor fragment shader outputs.
2824 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2825 * "Outputs from a vertex shader (out) and inputs to a fragment
2826 * shader (in) can be further qualified with one or more of these
2827 * interpolation qualifiers"
2829 * "These interpolation qualifiers may only precede the qualifiers in,
2830 * centroid in, out, or centroid out in a declaration. They do not apply
2831 * to the deprecated storage qualifiers varying or centroid
2832 * varying. They also do not apply to inputs into a vertex shader or
2833 * outputs from a fragment shader."
2835 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
2836 * "Outputs from a shader (out) and inputs to a shader (in) can be
2837 * further qualified with one of these interpolation qualifiers."
2839 * "These interpolation qualifiers may only precede the qualifiers
2840 * in, centroid in, out, or centroid out in a declaration. They do
2841 * not apply to inputs into a vertex shader or outputs from a
2844 if (state
->is_version(130, 300)
2845 && interpolation
!= INTERP_QUALIFIER_NONE
) {
2846 const char *i
= interpolation_string(interpolation
);
2847 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
2848 _mesa_glsl_error(loc
, state
,
2849 "interpolation qualifier `%s' can only be applied to "
2850 "shader inputs or outputs.", i
);
2852 switch (state
->stage
) {
2853 case MESA_SHADER_VERTEX
:
2854 if (mode
== ir_var_shader_in
) {
2855 _mesa_glsl_error(loc
, state
,
2856 "interpolation qualifier '%s' cannot be applied to "
2857 "vertex shader inputs", i
);
2860 case MESA_SHADER_FRAGMENT
:
2861 if (mode
== ir_var_shader_out
) {
2862 _mesa_glsl_error(loc
, state
,
2863 "interpolation qualifier '%s' cannot be applied to "
2864 "fragment shader outputs", i
);
2872 /* Interpolation qualifiers cannot be applied to 'centroid' and
2873 * 'centroid varying'.
2875 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2876 * "interpolation qualifiers may only precede the qualifiers in,
2877 * centroid in, out, or centroid out in a declaration. They do not apply
2878 * to the deprecated storage qualifiers varying or centroid varying."
2880 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2882 if (state
->is_version(130, 0)
2883 && interpolation
!= INTERP_QUALIFIER_NONE
2884 && qual
->flags
.q
.varying
) {
2886 const char *i
= interpolation_string(interpolation
);
2888 if (qual
->flags
.q
.centroid
)
2889 s
= "centroid varying";
2893 _mesa_glsl_error(loc
, state
,
2894 "qualifier '%s' cannot be applied to the "
2895 "deprecated storage qualifier '%s'", i
, s
);
2898 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2899 * so must integer vertex outputs.
2901 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2902 * "Fragment shader inputs that are signed or unsigned integers or
2903 * integer vectors must be qualified with the interpolation qualifier
2906 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2907 * "Fragment shader inputs that are, or contain, signed or unsigned
2908 * integers or integer vectors must be qualified with the
2909 * interpolation qualifier flat."
2911 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2912 * "Vertex shader outputs that are, or contain, signed or unsigned
2913 * integers or integer vectors must be qualified with the
2914 * interpolation qualifier flat."
2916 * Note that prior to GLSL 1.50, this requirement applied to vertex
2917 * outputs rather than fragment inputs. That creates problems in the
2918 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2919 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2920 * apply the restriction to both vertex outputs and fragment inputs.
2922 * Note also that the desktop GLSL specs are missing the text "or
2923 * contain"; this is presumably an oversight, since there is no
2924 * reasonable way to interpolate a fragment shader input that contains
2925 * an integer. See Khronos bug #15671.
2927 if (state
->is_version(130, 300)
2928 && var_type
->contains_integer()
2929 && interpolation
!= INTERP_QUALIFIER_FLAT
2930 && ((state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_in
)
2931 || (state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_out
2932 && state
->es_shader
))) {
2933 const char *shader_var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
2934 "vertex output" : "fragment input";
2935 _mesa_glsl_error(loc
, state
, "if a %s is (or contains) "
2936 "an integer, then it must be qualified with 'flat'",
2940 /* Double fragment inputs must be qualified with 'flat'.
2942 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
2943 * "This extension does not support interpolation of double-precision
2944 * values; doubles used as fragment shader inputs must be qualified as
2947 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
2948 * "Fragment shader inputs that are signed or unsigned integers, integer
2949 * vectors, or any double-precision floating-point type must be
2950 * qualified with the interpolation qualifier flat."
2952 * Note that the GLSL specs are missing the text "or contain"; this is
2953 * presumably an oversight. See Khronos bug #15671.
2955 * The 'double' type does not exist in GLSL ES so far.
2957 if ((state
->ARB_gpu_shader_fp64_enable
2958 || state
->is_version(400, 0))
2959 && var_type
->contains_double()
2960 && interpolation
!= INTERP_QUALIFIER_FLAT
2961 && state
->stage
== MESA_SHADER_FRAGMENT
2962 && mode
== ir_var_shader_in
) {
2963 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
2964 "a double, then it must be qualified with 'flat'");
2968 static glsl_interp_qualifier
2969 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2970 const struct glsl_type
*var_type
,
2971 ir_variable_mode mode
,
2972 struct _mesa_glsl_parse_state
*state
,
2975 glsl_interp_qualifier interpolation
;
2976 if (qual
->flags
.q
.flat
)
2977 interpolation
= INTERP_QUALIFIER_FLAT
;
2978 else if (qual
->flags
.q
.noperspective
)
2979 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2980 else if (qual
->flags
.q
.smooth
)
2981 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2982 else if (state
->es_shader
&&
2983 ((mode
== ir_var_shader_in
&&
2984 state
->stage
!= MESA_SHADER_VERTEX
) ||
2985 (mode
== ir_var_shader_out
&&
2986 state
->stage
!= MESA_SHADER_FRAGMENT
)))
2987 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
2989 * "When no interpolation qualifier is present, smooth interpolation
2992 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2994 interpolation
= INTERP_QUALIFIER_NONE
;
2996 validate_interpolation_qualifier(state
, loc
,
2998 qual
, var_type
, mode
);
3000 return interpolation
;
3005 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3007 struct _mesa_glsl_parse_state
*state
,
3012 unsigned qual_location
;
3013 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3018 /* Checks for GL_ARB_explicit_uniform_location. */
3019 if (qual
->flags
.q
.uniform
) {
3020 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3023 const struct gl_context
*const ctx
= state
->ctx
;
3024 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3026 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3027 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3028 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3029 ctx
->Const
.MaxUserAssignableUniformLocations
);
3033 var
->data
.explicit_location
= true;
3034 var
->data
.location
= qual_location
;
3038 /* Between GL_ARB_explicit_attrib_location an
3039 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3040 * stage can be assigned explicit locations. The checking here associates
3041 * the correct extension with the correct stage's input / output:
3045 * vertex explicit_loc sso
3046 * tess control sso sso
3049 * fragment sso explicit_loc
3051 switch (state
->stage
) {
3052 case MESA_SHADER_VERTEX
:
3053 if (var
->data
.mode
== ir_var_shader_in
) {
3054 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3060 if (var
->data
.mode
== ir_var_shader_out
) {
3061 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3070 case MESA_SHADER_TESS_CTRL
:
3071 case MESA_SHADER_TESS_EVAL
:
3072 case MESA_SHADER_GEOMETRY
:
3073 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3074 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3083 case MESA_SHADER_FRAGMENT
:
3084 if (var
->data
.mode
== ir_var_shader_in
) {
3085 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3091 if (var
->data
.mode
== ir_var_shader_out
) {
3092 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3101 case MESA_SHADER_COMPUTE
:
3102 _mesa_glsl_error(loc
, state
,
3103 "compute shader variables cannot be given "
3104 "explicit locations");
3109 _mesa_glsl_error(loc
, state
,
3110 "%s cannot be given an explicit location in %s shader",
3112 _mesa_shader_stage_to_string(state
->stage
));
3114 var
->data
.explicit_location
= true;
3116 switch (state
->stage
) {
3117 case MESA_SHADER_VERTEX
:
3118 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3119 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3120 : (qual_location
+ VARYING_SLOT_VAR0
);
3123 case MESA_SHADER_TESS_CTRL
:
3124 case MESA_SHADER_TESS_EVAL
:
3125 case MESA_SHADER_GEOMETRY
:
3126 if (var
->data
.patch
)
3127 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3129 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3132 case MESA_SHADER_FRAGMENT
:
3133 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3134 ? (qual_location
+ FRAG_RESULT_DATA0
)
3135 : (qual_location
+ VARYING_SLOT_VAR0
);
3137 case MESA_SHADER_COMPUTE
:
3138 assert(!"Unexpected shader type");
3142 /* Check if index was set for the uniform instead of the function */
3143 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
3144 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3145 "used with subroutine functions");
3149 unsigned qual_index
;
3150 if (qual
->flags
.q
.explicit_index
&&
3151 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3153 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3154 * Layout Qualifiers):
3156 * "It is also a compile-time error if a fragment shader
3157 * sets a layout index to less than 0 or greater than 1."
3159 * Older specifications don't mandate a behavior; we take
3160 * this as a clarification and always generate the error.
3162 if (qual_index
> 1) {
3163 _mesa_glsl_error(loc
, state
,
3164 "explicit index may only be 0 or 1");
3166 var
->data
.explicit_index
= true;
3167 var
->data
.index
= qual_index
;
3174 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3176 struct _mesa_glsl_parse_state
*state
,
3179 const glsl_type
*base_type
= var
->type
->without_array();
3181 if (base_type
->is_image()) {
3182 if (var
->data
.mode
!= ir_var_uniform
&&
3183 var
->data
.mode
!= ir_var_function_in
) {
3184 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3185 "function parameters or uniform-qualified "
3186 "global variables");
3189 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
3190 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
3191 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
3192 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
3193 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
3194 var
->data
.read_only
= true;
3196 if (qual
->flags
.q
.explicit_image_format
) {
3197 if (var
->data
.mode
== ir_var_function_in
) {
3198 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
3199 "used on image function parameters");
3202 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3203 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
3204 "base data type of the image");
3207 var
->data
.image_format
= qual
->image_format
;
3209 if (var
->data
.mode
== ir_var_uniform
) {
3210 if (state
->es_shader
) {
3211 _mesa_glsl_error(loc
, state
, "all image uniforms "
3212 "must have a format layout qualifier");
3214 } else if (!qual
->flags
.q
.write_only
) {
3215 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3216 "`writeonly' must have a format layout "
3221 var
->data
.image_format
= GL_NONE
;
3224 /* From page 70 of the GLSL ES 3.1 specification:
3226 * "Except for image variables qualified with the format qualifiers
3227 * r32f, r32i, and r32ui, image variables must specify either memory
3228 * qualifier readonly or the memory qualifier writeonly."
3230 if (state
->es_shader
&&
3231 var
->data
.image_format
!= GL_R32F
&&
3232 var
->data
.image_format
!= GL_R32I
&&
3233 var
->data
.image_format
!= GL_R32UI
&&
3234 !var
->data
.image_read_only
&&
3235 !var
->data
.image_write_only
) {
3236 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3237 "r32f, r32i or r32ui must be qualified `readonly' or "
3241 } else if (qual
->flags
.q
.read_only
||
3242 qual
->flags
.q
.write_only
||
3243 qual
->flags
.q
.coherent
||
3244 qual
->flags
.q
._volatile
||
3245 qual
->flags
.q
.restrict_flag
||
3246 qual
->flags
.q
.explicit_image_format
) {
3247 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3252 static inline const char*
3253 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3255 if (origin_upper_left
&& pixel_center_integer
)
3256 return "origin_upper_left, pixel_center_integer";
3257 else if (origin_upper_left
)
3258 return "origin_upper_left";
3259 else if (pixel_center_integer
)
3260 return "pixel_center_integer";
3266 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3267 const struct ast_type_qualifier
*qual
)
3269 /* If gl_FragCoord was previously declared, and the qualifiers were
3270 * different in any way, return true.
3272 if (state
->fs_redeclares_gl_fragcoord
) {
3273 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3274 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3281 validate_array_dimensions(const glsl_type
*t
,
3282 struct _mesa_glsl_parse_state
*state
,
3284 if (t
->is_array()) {
3285 t
= t
->fields
.array
;
3286 while (t
->is_array()) {
3287 if (t
->is_unsized_array()) {
3288 _mesa_glsl_error(loc
, state
,
3289 "only the outermost array dimension can "
3294 t
= t
->fields
.array
;
3300 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3302 struct _mesa_glsl_parse_state
*state
,
3305 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3307 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3309 * "Within any shader, the first redeclarations of gl_FragCoord
3310 * must appear before any use of gl_FragCoord."
3312 * Generate a compiler error if above condition is not met by the
3315 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3316 if (earlier
!= NULL
&&
3317 earlier
->data
.used
&&
3318 !state
->fs_redeclares_gl_fragcoord
) {
3319 _mesa_glsl_error(loc
, state
,
3320 "gl_FragCoord used before its first redeclaration "
3321 "in fragment shader");
3324 /* Make sure all gl_FragCoord redeclarations specify the same layout
3327 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3328 const char *const qual_string
=
3329 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3330 qual
->flags
.q
.pixel_center_integer
);
3332 const char *const state_string
=
3333 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3334 state
->fs_pixel_center_integer
);
3336 _mesa_glsl_error(loc
, state
,
3337 "gl_FragCoord redeclared with different layout "
3338 "qualifiers (%s) and (%s) ",
3342 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3343 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3344 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3345 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3346 state
->fs_redeclares_gl_fragcoord
=
3347 state
->fs_origin_upper_left
||
3348 state
->fs_pixel_center_integer
||
3349 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3352 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3353 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3354 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3355 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3356 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3357 ? "origin_upper_left" : "pixel_center_integer";
3359 _mesa_glsl_error(loc
, state
,
3360 "layout qualifier `%s' can only be applied to "
3361 "fragment shader input `gl_FragCoord'",
3365 if (qual
->flags
.q
.explicit_location
) {
3366 apply_explicit_location(qual
, var
, state
, loc
);
3368 if (qual
->flags
.q
.explicit_component
) {
3369 unsigned qual_component
;
3370 if (process_qualifier_constant(state
, loc
, "component",
3371 qual
->component
, &qual_component
)) {
3372 const glsl_type
*type
= var
->type
->without_array();
3373 unsigned components
= type
->component_slots();
3375 if (type
->is_matrix() || type
->is_record()) {
3376 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3377 "cannot be applied to a matrix, a structure, "
3378 "a block, or an array containing any of "
3380 } else if (qual_component
!= 0 &&
3381 (qual_component
+ components
- 1) > 3) {
3382 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3383 (qual_component
+ components
- 1));
3384 } else if (qual_component
== 1 && type
->is_double()) {
3385 /* We don't bother checking for 3 as it should be caught by the
3386 * overflow check above.
3388 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3389 "component 1 or 3");
3391 var
->data
.explicit_component
= true;
3392 var
->data
.location_frac
= qual_component
;
3396 } else if (qual
->flags
.q
.explicit_index
) {
3397 if (!qual
->flags
.q
.subroutine_def
)
3398 _mesa_glsl_error(loc
, state
,
3399 "explicit index requires explicit location");
3400 } else if (qual
->flags
.q
.explicit_component
) {
3401 _mesa_glsl_error(loc
, state
,
3402 "explicit component requires explicit location");
3405 if (qual
->flags
.q
.explicit_binding
) {
3406 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3409 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3410 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3411 unsigned qual_stream
;
3412 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3414 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3415 var
->data
.stream
= qual_stream
;
3419 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3420 unsigned qual_xfb_buffer
;
3421 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3422 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3423 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3424 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3425 if (qual
->flags
.q
.explicit_xfb_buffer
)
3426 var
->data
.explicit_xfb_buffer
= true;
3430 if (qual
->flags
.q
.explicit_xfb_offset
) {
3431 unsigned qual_xfb_offset
;
3432 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3434 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3435 qual
->offset
, &qual_xfb_offset
) &&
3436 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3437 var
->type
, component_size
)) {
3438 var
->data
.offset
= qual_xfb_offset
;
3439 var
->data
.explicit_xfb_offset
= true;
3443 if (qual
->flags
.q
.explicit_xfb_stride
) {
3444 unsigned qual_xfb_stride
;
3445 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3446 qual
->xfb_stride
, &qual_xfb_stride
)) {
3447 var
->data
.xfb_stride
= qual_xfb_stride
;
3448 var
->data
.explicit_xfb_stride
= true;
3452 if (var
->type
->contains_atomic()) {
3453 if (var
->data
.mode
== ir_var_uniform
) {
3454 if (var
->data
.explicit_binding
) {
3456 &state
->atomic_counter_offsets
[var
->data
.binding
];
3458 if (*offset
% ATOMIC_COUNTER_SIZE
)
3459 _mesa_glsl_error(loc
, state
,
3460 "misaligned atomic counter offset");
3462 var
->data
.offset
= *offset
;
3463 *offset
+= var
->type
->atomic_size();
3466 _mesa_glsl_error(loc
, state
,
3467 "atomic counters require explicit binding point");
3469 } else if (var
->data
.mode
!= ir_var_function_in
) {
3470 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3471 "function parameters or uniform-qualified "
3472 "global variables");
3476 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3477 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3478 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3479 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3480 * These extensions and all following extensions that add the 'layout'
3481 * keyword have been modified to require the use of 'in' or 'out'.
3483 * The following extension do not allow the deprecated keywords:
3485 * GL_AMD_conservative_depth
3486 * GL_ARB_conservative_depth
3487 * GL_ARB_gpu_shader5
3488 * GL_ARB_separate_shader_objects
3489 * GL_ARB_tessellation_shader
3490 * GL_ARB_transform_feedback3
3491 * GL_ARB_uniform_buffer_object
3493 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3494 * allow layout with the deprecated keywords.
3496 const bool relaxed_layout_qualifier_checking
=
3497 state
->ARB_fragment_coord_conventions_enable
;
3499 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3500 || qual
->flags
.q
.varying
;
3501 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3502 if (relaxed_layout_qualifier_checking
) {
3503 _mesa_glsl_warning(loc
, state
,
3504 "`layout' qualifier may not be used with "
3505 "`attribute' or `varying'");
3507 _mesa_glsl_error(loc
, state
,
3508 "`layout' qualifier may not be used with "
3509 "`attribute' or `varying'");
3513 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3514 * AMD_conservative_depth.
3516 int depth_layout_count
= qual
->flags
.q
.depth_any
3517 + qual
->flags
.q
.depth_greater
3518 + qual
->flags
.q
.depth_less
3519 + qual
->flags
.q
.depth_unchanged
;
3520 if (depth_layout_count
> 0
3521 && !state
->is_version(420, 0)
3522 && !state
->AMD_conservative_depth_enable
3523 && !state
->ARB_conservative_depth_enable
) {
3524 _mesa_glsl_error(loc
, state
,
3525 "extension GL_AMD_conservative_depth or "
3526 "GL_ARB_conservative_depth must be enabled "
3527 "to use depth layout qualifiers");
3528 } else if (depth_layout_count
> 0
3529 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3530 _mesa_glsl_error(loc
, state
,
3531 "depth layout qualifiers can be applied only to "
3533 } else if (depth_layout_count
> 1
3534 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3535 _mesa_glsl_error(loc
, state
,
3536 "at most one depth layout qualifier can be applied to "
3539 if (qual
->flags
.q
.depth_any
)
3540 var
->data
.depth_layout
= ir_depth_layout_any
;
3541 else if (qual
->flags
.q
.depth_greater
)
3542 var
->data
.depth_layout
= ir_depth_layout_greater
;
3543 else if (qual
->flags
.q
.depth_less
)
3544 var
->data
.depth_layout
= ir_depth_layout_less
;
3545 else if (qual
->flags
.q
.depth_unchanged
)
3546 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3548 var
->data
.depth_layout
= ir_depth_layout_none
;
3550 if (qual
->flags
.q
.std140
||
3551 qual
->flags
.q
.std430
||
3552 qual
->flags
.q
.packed
||
3553 qual
->flags
.q
.shared
) {
3554 _mesa_glsl_error(loc
, state
,
3555 "uniform and shader storage block layout qualifiers "
3556 "std140, std430, packed, and shared can only be "
3557 "applied to uniform or shader storage blocks, not "
3561 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3562 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3565 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3568 * "Fragment shaders also allow the following layout qualifier on in only
3569 * (not with variable declarations)
3570 * layout-qualifier-id
3571 * early_fragment_tests
3574 if (qual
->flags
.q
.early_fragment_tests
) {
3575 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3576 "valid in fragment shader input layout declaration.");
3581 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3583 struct _mesa_glsl_parse_state
*state
,
3587 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3589 if (qual
->flags
.q
.invariant
) {
3590 if (var
->data
.used
) {
3591 _mesa_glsl_error(loc
, state
,
3592 "variable `%s' may not be redeclared "
3593 "`invariant' after being used",
3596 var
->data
.invariant
= 1;
3600 if (qual
->flags
.q
.precise
) {
3601 if (var
->data
.used
) {
3602 _mesa_glsl_error(loc
, state
,
3603 "variable `%s' may not be redeclared "
3604 "`precise' after being used",
3607 var
->data
.precise
= 1;
3611 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3612 _mesa_glsl_error(loc
, state
,
3613 "`subroutine' may only be applied to uniforms, "
3614 "subroutine type declarations, or function definitions");
3617 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3618 || qual
->flags
.q
.uniform
3619 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3620 var
->data
.read_only
= 1;
3622 if (qual
->flags
.q
.centroid
)
3623 var
->data
.centroid
= 1;
3625 if (qual
->flags
.q
.sample
)
3626 var
->data
.sample
= 1;
3628 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3629 if (state
->es_shader
) {
3630 var
->data
.precision
=
3631 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3634 if (qual
->flags
.q
.patch
)
3635 var
->data
.patch
= 1;
3637 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3638 var
->type
= glsl_type::error_type
;
3639 _mesa_glsl_error(loc
, state
,
3640 "`attribute' variables may not be declared in the "
3642 _mesa_shader_stage_to_string(state
->stage
));
3645 /* Disallow layout qualifiers which may only appear on layout declarations. */
3646 if (qual
->flags
.q
.prim_type
) {
3647 _mesa_glsl_error(loc
, state
,
3648 "Primitive type may only be specified on GS input or output "
3649 "layout declaration, not on variables.");
3652 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3654 * "However, the const qualifier cannot be used with out or inout."
3656 * The same section of the GLSL 4.40 spec further clarifies this saying:
3658 * "The const qualifier cannot be used with out or inout, or a
3659 * compile-time error results."
3661 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3662 _mesa_glsl_error(loc
, state
,
3663 "`const' may not be applied to `out' or `inout' "
3664 "function parameters");
3667 /* If there is no qualifier that changes the mode of the variable, leave
3668 * the setting alone.
3670 assert(var
->data
.mode
!= ir_var_temporary
);
3671 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3672 var
->data
.mode
= ir_var_function_inout
;
3673 else if (qual
->flags
.q
.in
)
3674 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3675 else if (qual
->flags
.q
.attribute
3676 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3677 var
->data
.mode
= ir_var_shader_in
;
3678 else if (qual
->flags
.q
.out
)
3679 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3680 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3681 var
->data
.mode
= ir_var_shader_out
;
3682 else if (qual
->flags
.q
.uniform
)
3683 var
->data
.mode
= ir_var_uniform
;
3684 else if (qual
->flags
.q
.buffer
)
3685 var
->data
.mode
= ir_var_shader_storage
;
3686 else if (qual
->flags
.q
.shared_storage
)
3687 var
->data
.mode
= ir_var_shader_shared
;
3689 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3690 /* User-defined ins/outs are not permitted in compute shaders. */
3691 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3692 _mesa_glsl_error(loc
, state
,
3693 "user-defined input and output variables are not "
3694 "permitted in compute shaders");
3697 /* This variable is being used to link data between shader stages (in
3698 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3699 * that is allowed for such purposes.
3701 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3703 * "The varying qualifier can be used only with the data types
3704 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3707 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3708 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3710 * "Fragment inputs can only be signed and unsigned integers and
3711 * integer vectors, float, floating-point vectors, matrices, or
3712 * arrays of these. Structures cannot be input.
3714 * Similar text exists in the section on vertex shader outputs.
3716 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3717 * 3.00 spec allows structs as well. Varying structs are also allowed
3720 switch (var
->type
->get_scalar_type()->base_type
) {
3721 case GLSL_TYPE_FLOAT
:
3722 /* Ok in all GLSL versions */
3724 case GLSL_TYPE_UINT
:
3726 if (state
->is_version(130, 300))
3728 _mesa_glsl_error(loc
, state
,
3729 "varying variables must be of base type float in %s",
3730 state
->get_version_string());
3732 case GLSL_TYPE_STRUCT
:
3733 if (state
->is_version(150, 300))
3735 _mesa_glsl_error(loc
, state
,
3736 "varying variables may not be of type struct");
3738 case GLSL_TYPE_DOUBLE
:
3741 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3746 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3747 switch (state
->stage
) {
3748 case MESA_SHADER_VERTEX
:
3749 if (var
->data
.mode
== ir_var_shader_out
)
3750 var
->data
.invariant
= true;
3752 case MESA_SHADER_TESS_CTRL
:
3753 case MESA_SHADER_TESS_EVAL
:
3754 case MESA_SHADER_GEOMETRY
:
3755 if ((var
->data
.mode
== ir_var_shader_in
)
3756 || (var
->data
.mode
== ir_var_shader_out
))
3757 var
->data
.invariant
= true;
3759 case MESA_SHADER_FRAGMENT
:
3760 if (var
->data
.mode
== ir_var_shader_in
)
3761 var
->data
.invariant
= true;
3763 case MESA_SHADER_COMPUTE
:
3764 /* Invariance isn't meaningful in compute shaders. */
3769 var
->data
.interpolation
=
3770 interpret_interpolation_qualifier(qual
, var
->type
,
3771 (ir_variable_mode
) var
->data
.mode
,
3774 /* Does the declaration use the deprecated 'attribute' or 'varying'
3777 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3778 || qual
->flags
.q
.varying
;
3781 /* Validate auxiliary storage qualifiers */
3783 /* From section 4.3.4 of the GLSL 1.30 spec:
3784 * "It is an error to use centroid in in a vertex shader."
3786 * From section 4.3.4 of the GLSL ES 3.00 spec:
3787 * "It is an error to use centroid in or interpolation qualifiers in
3788 * a vertex shader input."
3791 /* Section 4.3.6 of the GLSL 1.30 specification states:
3792 * "It is an error to use centroid out in a fragment shader."
3794 * The GL_ARB_shading_language_420pack extension specification states:
3795 * "It is an error to use auxiliary storage qualifiers or interpolation
3796 * qualifiers on an output in a fragment shader."
3798 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3799 _mesa_glsl_error(loc
, state
,
3800 "sample qualifier may only be used on `in` or `out` "
3801 "variables between shader stages");
3803 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3804 _mesa_glsl_error(loc
, state
,
3805 "centroid qualifier may only be used with `in', "
3806 "`out' or `varying' variables between shader stages");
3809 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3810 _mesa_glsl_error(loc
, state
,
3811 "the shared storage qualifiers can only be used with "
3815 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3819 * Get the variable that is being redeclared by this declaration
3821 * Semantic checks to verify the validity of the redeclaration are also
3822 * performed. If semantic checks fail, compilation error will be emitted via
3823 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3826 * A pointer to an existing variable in the current scope if the declaration
3827 * is a redeclaration, \c NULL otherwise.
3829 static ir_variable
*
3830 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3831 struct _mesa_glsl_parse_state
*state
,
3832 bool allow_all_redeclarations
)
3834 /* Check if this declaration is actually a re-declaration, either to
3835 * resize an array or add qualifiers to an existing variable.
3837 * This is allowed for variables in the current scope, or when at
3838 * global scope (for built-ins in the implicit outer scope).
3840 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3841 if (earlier
== NULL
||
3842 (state
->current_function
!= NULL
&&
3843 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3848 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3850 * "It is legal to declare an array without a size and then
3851 * later re-declare the same name as an array of the same
3852 * type and specify a size."
3854 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3855 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3856 /* FINISHME: This doesn't match the qualifiers on the two
3857 * FINISHME: declarations. It's not 100% clear whether this is
3858 * FINISHME: required or not.
3861 const unsigned size
= unsigned(var
->type
->array_size());
3862 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3863 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3864 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3866 earlier
->data
.max_array_access
);
3869 earlier
->type
= var
->type
;
3872 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3873 state
->is_version(150, 0))
3874 && strcmp(var
->name
, "gl_FragCoord") == 0
3875 && earlier
->type
== var
->type
3876 && var
->data
.mode
== ir_var_shader_in
) {
3877 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3880 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3881 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3883 /* According to section 4.3.7 of the GLSL 1.30 spec,
3884 * the following built-in varaibles can be redeclared with an
3885 * interpolation qualifier:
3888 * * gl_FrontSecondaryColor
3889 * * gl_BackSecondaryColor
3891 * * gl_SecondaryColor
3893 } else if (state
->is_version(130, 0)
3894 && (strcmp(var
->name
, "gl_FrontColor") == 0
3895 || strcmp(var
->name
, "gl_BackColor") == 0
3896 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3897 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3898 || strcmp(var
->name
, "gl_Color") == 0
3899 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3900 && earlier
->type
== var
->type
3901 && earlier
->data
.mode
== var
->data
.mode
) {
3902 earlier
->data
.interpolation
= var
->data
.interpolation
;
3904 /* Layout qualifiers for gl_FragDepth. */
3905 } else if ((state
->is_version(420, 0) ||
3906 state
->AMD_conservative_depth_enable
||
3907 state
->ARB_conservative_depth_enable
)
3908 && strcmp(var
->name
, "gl_FragDepth") == 0
3909 && earlier
->type
== var
->type
3910 && earlier
->data
.mode
== var
->data
.mode
) {
3912 /** From the AMD_conservative_depth spec:
3913 * Within any shader, the first redeclarations of gl_FragDepth
3914 * must appear before any use of gl_FragDepth.
3916 if (earlier
->data
.used
) {
3917 _mesa_glsl_error(&loc
, state
,
3918 "the first redeclaration of gl_FragDepth "
3919 "must appear before any use of gl_FragDepth");
3922 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3923 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3924 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3925 _mesa_glsl_error(&loc
, state
,
3926 "gl_FragDepth: depth layout is declared here "
3927 "as '%s, but it was previously declared as "
3929 depth_layout_string(var
->data
.depth_layout
),
3930 depth_layout_string(earlier
->data
.depth_layout
));
3933 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3935 } else if (allow_all_redeclarations
) {
3936 if (earlier
->data
.mode
!= var
->data
.mode
) {
3937 _mesa_glsl_error(&loc
, state
,
3938 "redeclaration of `%s' with incorrect qualifiers",
3940 } else if (earlier
->type
!= var
->type
) {
3941 _mesa_glsl_error(&loc
, state
,
3942 "redeclaration of `%s' has incorrect type",
3946 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3953 * Generate the IR for an initializer in a variable declaration
3956 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3957 ast_fully_specified_type
*type
,
3958 exec_list
*initializer_instructions
,
3959 struct _mesa_glsl_parse_state
*state
)
3961 ir_rvalue
*result
= NULL
;
3963 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3965 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3967 * "All uniform variables are read-only and are initialized either
3968 * directly by an application via API commands, or indirectly by
3971 if (var
->data
.mode
== ir_var_uniform
) {
3972 state
->check_version(120, 0, &initializer_loc
,
3973 "cannot initialize uniform %s",
3977 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3979 * "Buffer variables cannot have initializers."
3981 if (var
->data
.mode
== ir_var_shader_storage
) {
3982 _mesa_glsl_error(&initializer_loc
, state
,
3983 "cannot initialize buffer variable %s",
3987 /* From section 4.1.7 of the GLSL 4.40 spec:
3989 * "Opaque variables [...] are initialized only through the
3990 * OpenGL API; they cannot be declared with an initializer in a
3993 if (var
->type
->contains_opaque()) {
3994 _mesa_glsl_error(&initializer_loc
, state
,
3995 "cannot initialize opaque variable %s",
3999 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4000 _mesa_glsl_error(&initializer_loc
, state
,
4001 "cannot initialize %s shader input / %s %s",
4002 _mesa_shader_stage_to_string(state
->stage
),
4003 (state
->stage
== MESA_SHADER_VERTEX
)
4004 ? "attribute" : "varying",
4008 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4009 _mesa_glsl_error(&initializer_loc
, state
,
4010 "cannot initialize %s shader output %s",
4011 _mesa_shader_stage_to_string(state
->stage
),
4015 /* If the initializer is an ast_aggregate_initializer, recursively store
4016 * type information from the LHS into it, so that its hir() function can do
4019 if (decl
->initializer
->oper
== ast_aggregate
)
4020 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4022 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4023 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4025 /* Calculate the constant value if this is a const or uniform
4028 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4030 * "Declarations of globals without a storage qualifier, or with
4031 * just the const qualifier, may include initializers, in which case
4032 * they will be initialized before the first line of main() is
4033 * executed. Such initializers must be a constant expression."
4035 * The same section of the GLSL ES 3.00.4 spec has similar language.
4037 if (type
->qualifier
.flags
.q
.constant
4038 || type
->qualifier
.flags
.q
.uniform
4039 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4040 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4042 if (new_rhs
!= NULL
) {
4045 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4048 * "A constant expression is one of
4052 * - an expression formed by an operator on operands that are
4053 * all constant expressions, including getting an element of
4054 * a constant array, or a field of a constant structure, or
4055 * components of a constant vector. However, the sequence
4056 * operator ( , ) and the assignment operators ( =, +=, ...)
4057 * are not included in the operators that can create a
4058 * constant expression."
4060 * Section 12.43 (Sequence operator and constant expressions) says:
4062 * "Should the following construct be allowed?
4066 * The expression within the brackets uses the sequence operator
4067 * (',') and returns the integer 3 so the construct is declaring
4068 * a single-dimensional array of size 3. In some languages, the
4069 * construct declares a two-dimensional array. It would be
4070 * preferable to make this construct illegal to avoid confusion.
4072 * One possibility is to change the definition of the sequence
4073 * operator so that it does not return a constant-expression and
4074 * hence cannot be used to declare an array size.
4076 * RESOLUTION: The result of a sequence operator is not a
4077 * constant-expression."
4079 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4080 * contains language almost identical to the section 4.3.3 in the
4081 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4084 ir_constant
*constant_value
= rhs
->constant_expression_value();
4085 if (!constant_value
||
4086 (state
->is_version(430, 300) &&
4087 decl
->initializer
->has_sequence_subexpression())) {
4088 const char *const variable_mode
=
4089 (type
->qualifier
.flags
.q
.constant
)
4091 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4093 /* If ARB_shading_language_420pack is enabled, initializers of
4094 * const-qualified local variables do not have to be constant
4095 * expressions. Const-qualified global variables must still be
4096 * initialized with constant expressions.
4098 if (!state
->has_420pack()
4099 || state
->current_function
== NULL
) {
4100 _mesa_glsl_error(& initializer_loc
, state
,
4101 "initializer of %s variable `%s' must be a "
4102 "constant expression",
4105 if (var
->type
->is_numeric()) {
4106 /* Reduce cascading errors. */
4107 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4108 ? ir_constant::zero(state
, var
->type
) : NULL
;
4112 rhs
= constant_value
;
4113 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4114 ? constant_value
: NULL
;
4117 if (var
->type
->is_numeric()) {
4118 /* Reduce cascading errors. */
4119 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4120 ? ir_constant::zero(state
, var
->type
) : NULL
;
4125 if (rhs
&& !rhs
->type
->is_error()) {
4126 bool temp
= var
->data
.read_only
;
4127 if (type
->qualifier
.flags
.q
.constant
)
4128 var
->data
.read_only
= false;
4130 /* Never emit code to initialize a uniform.
4132 const glsl_type
*initializer_type
;
4133 if (!type
->qualifier
.flags
.q
.uniform
) {
4134 do_assignment(initializer_instructions
, state
,
4139 type
->get_location());
4140 initializer_type
= result
->type
;
4142 initializer_type
= rhs
->type
;
4144 var
->constant_initializer
= rhs
->constant_expression_value();
4145 var
->data
.has_initializer
= true;
4147 /* If the declared variable is an unsized array, it must inherrit
4148 * its full type from the initializer. A declaration such as
4150 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4154 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4156 * The assignment generated in the if-statement (below) will also
4157 * automatically handle this case for non-uniforms.
4159 * If the declared variable is not an array, the types must
4160 * already match exactly. As a result, the type assignment
4161 * here can be done unconditionally. For non-uniforms the call
4162 * to do_assignment can change the type of the initializer (via
4163 * the implicit conversion rules). For uniforms the initializer
4164 * must be a constant expression, and the type of that expression
4165 * was validated above.
4167 var
->type
= initializer_type
;
4169 var
->data
.read_only
= temp
;
4176 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4177 YYLTYPE loc
, ir_variable
*var
,
4178 unsigned num_vertices
,
4180 const char *var_category
)
4182 if (var
->type
->is_unsized_array()) {
4183 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4185 * All geometry shader input unsized array declarations will be
4186 * sized by an earlier input layout qualifier, when present, as per
4187 * the following table.
4189 * Followed by a table mapping each allowed input layout qualifier to
4190 * the corresponding input length.
4192 * Similarly for tessellation control shader outputs.
4194 if (num_vertices
!= 0)
4195 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4198 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4199 * includes the following examples of compile-time errors:
4201 * // code sequence within one shader...
4202 * in vec4 Color1[]; // size unknown
4203 * ...Color1.length()...// illegal, length() unknown
4204 * in vec4 Color2[2]; // size is 2
4205 * ...Color1.length()...// illegal, Color1 still has no size
4206 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4207 * layout(lines) in; // legal, input size is 2, matching
4208 * in vec4 Color4[3]; // illegal, contradicts layout
4211 * To detect the case illustrated by Color3, we verify that the size of
4212 * an explicitly-sized array matches the size of any previously declared
4213 * explicitly-sized array. To detect the case illustrated by Color4, we
4214 * verify that the size of an explicitly-sized array is consistent with
4215 * any previously declared input layout.
4217 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4218 _mesa_glsl_error(&loc
, state
,
4219 "%s size contradicts previously declared layout "
4220 "(size is %u, but layout requires a size of %u)",
4221 var_category
, var
->type
->length
, num_vertices
);
4222 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4223 _mesa_glsl_error(&loc
, state
,
4224 "%s sizes are inconsistent (size is %u, but a "
4225 "previous declaration has size %u)",
4226 var_category
, var
->type
->length
, *size
);
4228 *size
= var
->type
->length
;
4234 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4235 YYLTYPE loc
, ir_variable
*var
)
4237 unsigned num_vertices
= 0;
4239 if (state
->tcs_output_vertices_specified
) {
4240 if (!state
->out_qualifier
->vertices
->
4241 process_qualifier_constant(state
, "vertices",
4242 &num_vertices
, false)) {
4246 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4247 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4248 "GL_MAX_PATCH_VERTICES", num_vertices
);
4253 if (!var
->type
->is_array() && !var
->data
.patch
) {
4254 _mesa_glsl_error(&loc
, state
,
4255 "tessellation control shader outputs must be arrays");
4257 /* To avoid cascading failures, short circuit the checks below. */
4261 if (var
->data
.patch
)
4264 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4265 &state
->tcs_output_size
,
4266 "tessellation control shader output");
4270 * Do additional processing necessary for tessellation control/evaluation shader
4271 * input declarations. This covers both interface block arrays and bare input
4275 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4276 YYLTYPE loc
, ir_variable
*var
)
4278 if (!var
->type
->is_array() && !var
->data
.patch
) {
4279 _mesa_glsl_error(&loc
, state
,
4280 "per-vertex tessellation shader inputs must be arrays");
4281 /* Avoid cascading failures. */
4285 if (var
->data
.patch
)
4288 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
4289 if (var
->type
->is_unsized_array()) {
4290 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4291 state
->Const
.MaxPatchVertices
);
4297 * Do additional processing necessary for geometry shader input declarations
4298 * (this covers both interface blocks arrays and bare input variables).
4301 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4302 YYLTYPE loc
, ir_variable
*var
)
4304 unsigned num_vertices
= 0;
4306 if (state
->gs_input_prim_type_specified
) {
4307 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4310 /* Geometry shader input variables must be arrays. Caller should have
4311 * reported an error for this.
4313 if (!var
->type
->is_array()) {
4314 assert(state
->error
);
4316 /* To avoid cascading failures, short circuit the checks below. */
4320 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4321 &state
->gs_input_size
,
4322 "geometry shader input");
4326 validate_identifier(const char *identifier
, YYLTYPE loc
,
4327 struct _mesa_glsl_parse_state
*state
)
4329 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4331 * "Identifiers starting with "gl_" are reserved for use by
4332 * OpenGL, and may not be declared in a shader as either a
4333 * variable or a function."
4335 if (is_gl_identifier(identifier
)) {
4336 _mesa_glsl_error(&loc
, state
,
4337 "identifier `%s' uses reserved `gl_' prefix",
4339 } else if (strstr(identifier
, "__")) {
4340 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4343 * "In addition, all identifiers containing two
4344 * consecutive underscores (__) are reserved as
4345 * possible future keywords."
4347 * The intention is that names containing __ are reserved for internal
4348 * use by the implementation, and names prefixed with GL_ are reserved
4349 * for use by Khronos. Names simply containing __ are dangerous to use,
4350 * but should be allowed.
4352 * A future version of the GLSL specification will clarify this.
4354 _mesa_glsl_warning(&loc
, state
,
4355 "identifier `%s' uses reserved `__' string",
4361 ast_declarator_list::hir(exec_list
*instructions
,
4362 struct _mesa_glsl_parse_state
*state
)
4365 const struct glsl_type
*decl_type
;
4366 const char *type_name
= NULL
;
4367 ir_rvalue
*result
= NULL
;
4368 YYLTYPE loc
= this->get_location();
4370 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4372 * "To ensure that a particular output variable is invariant, it is
4373 * necessary to use the invariant qualifier. It can either be used to
4374 * qualify a previously declared variable as being invariant
4376 * invariant gl_Position; // make existing gl_Position be invariant"
4378 * In these cases the parser will set the 'invariant' flag in the declarator
4379 * list, and the type will be NULL.
4381 if (this->invariant
) {
4382 assert(this->type
== NULL
);
4384 if (state
->current_function
!= NULL
) {
4385 _mesa_glsl_error(& loc
, state
,
4386 "all uses of `invariant' keyword must be at global "
4390 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4391 assert(decl
->array_specifier
== NULL
);
4392 assert(decl
->initializer
== NULL
);
4394 ir_variable
*const earlier
=
4395 state
->symbols
->get_variable(decl
->identifier
);
4396 if (earlier
== NULL
) {
4397 _mesa_glsl_error(& loc
, state
,
4398 "undeclared variable `%s' cannot be marked "
4399 "invariant", decl
->identifier
);
4400 } else if (!is_varying_var(earlier
, state
->stage
)) {
4401 _mesa_glsl_error(&loc
, state
,
4402 "`%s' cannot be marked invariant; interfaces between "
4403 "shader stages only.", decl
->identifier
);
4404 } else if (earlier
->data
.used
) {
4405 _mesa_glsl_error(& loc
, state
,
4406 "variable `%s' may not be redeclared "
4407 "`invariant' after being used",
4410 earlier
->data
.invariant
= true;
4414 /* Invariant redeclarations do not have r-values.
4419 if (this->precise
) {
4420 assert(this->type
== NULL
);
4422 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4423 assert(decl
->array_specifier
== NULL
);
4424 assert(decl
->initializer
== NULL
);
4426 ir_variable
*const earlier
=
4427 state
->symbols
->get_variable(decl
->identifier
);
4428 if (earlier
== NULL
) {
4429 _mesa_glsl_error(& loc
, state
,
4430 "undeclared variable `%s' cannot be marked "
4431 "precise", decl
->identifier
);
4432 } else if (state
->current_function
!= NULL
&&
4433 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4434 /* Note: we have to check if we're in a function, since
4435 * builtins are treated as having come from another scope.
4437 _mesa_glsl_error(& loc
, state
,
4438 "variable `%s' from an outer scope may not be "
4439 "redeclared `precise' in this scope",
4441 } else if (earlier
->data
.used
) {
4442 _mesa_glsl_error(& loc
, state
,
4443 "variable `%s' may not be redeclared "
4444 "`precise' after being used",
4447 earlier
->data
.precise
= true;
4451 /* Precise redeclarations do not have r-values either. */
4455 assert(this->type
!= NULL
);
4456 assert(!this->invariant
);
4457 assert(!this->precise
);
4459 /* The type specifier may contain a structure definition. Process that
4460 * before any of the variable declarations.
4462 (void) this->type
->specifier
->hir(instructions
, state
);
4464 decl_type
= this->type
->glsl_type(& type_name
, state
);
4466 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4467 * "Buffer variables may only be declared inside interface blocks
4468 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4469 * shader storage blocks. It is a compile-time error to declare buffer
4470 * variables at global scope (outside a block)."
4472 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4473 _mesa_glsl_error(&loc
, state
,
4474 "buffer variables cannot be declared outside "
4475 "interface blocks");
4478 /* An offset-qualified atomic counter declaration sets the default
4479 * offset for the next declaration within the same atomic counter
4482 if (decl_type
&& decl_type
->contains_atomic()) {
4483 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4484 type
->qualifier
.flags
.q
.explicit_offset
) {
4485 unsigned qual_binding
;
4486 unsigned qual_offset
;
4487 if (process_qualifier_constant(state
, &loc
, "binding",
4488 type
->qualifier
.binding
,
4490 && process_qualifier_constant(state
, &loc
, "offset",
4491 type
->qualifier
.offset
,
4493 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4497 ast_type_qualifier allowed_atomic_qual_mask
;
4498 allowed_atomic_qual_mask
.flags
.i
= 0;
4499 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4500 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4501 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4503 type
->qualifier
.validate_flags(&loc
, state
,
4504 "invalid layout qualifier for "
4506 allowed_atomic_qual_mask
);
4509 if (this->declarations
.is_empty()) {
4510 /* If there is no structure involved in the program text, there are two
4511 * possible scenarios:
4513 * - The program text contained something like 'vec4;'. This is an
4514 * empty declaration. It is valid but weird. Emit a warning.
4516 * - The program text contained something like 'S;' and 'S' is not the
4517 * name of a known structure type. This is both invalid and weird.
4520 * - The program text contained something like 'mediump float;'
4521 * when the programmer probably meant 'precision mediump
4522 * float;' Emit a warning with a description of what they
4523 * probably meant to do.
4525 * Note that if decl_type is NULL and there is a structure involved,
4526 * there must have been some sort of error with the structure. In this
4527 * case we assume that an error was already generated on this line of
4528 * code for the structure. There is no need to generate an additional,
4531 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4534 if (decl_type
== NULL
) {
4535 _mesa_glsl_error(&loc
, state
,
4536 "invalid type `%s' in empty declaration",
4539 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4540 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4543 * "... any declaration that leaves the size undefined is
4544 * disallowed as this would add complexity and there are no
4547 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4548 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4549 "or implicitly defined");
4552 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4554 * "The combinations of types and qualifiers that cause
4555 * compile-time or link-time errors are the same whether or not
4556 * the declaration is empty."
4558 validate_array_dimensions(decl_type
, state
, &loc
);
4561 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4562 /* Empty atomic counter declarations are allowed and useful
4563 * to set the default offset qualifier.
4566 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4567 if (this->type
->specifier
->structure
!= NULL
) {
4568 _mesa_glsl_error(&loc
, state
,
4569 "precision qualifiers can't be applied "
4572 static const char *const precision_names
[] = {
4579 _mesa_glsl_warning(&loc
, state
,
4580 "empty declaration with precision "
4581 "qualifier, to set the default precision, "
4582 "use `precision %s %s;'",
4583 precision_names
[this->type
->
4584 qualifier
.precision
],
4587 } else if (this->type
->specifier
->structure
== NULL
) {
4588 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4593 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4594 const struct glsl_type
*var_type
;
4596 const char *identifier
= decl
->identifier
;
4597 /* FINISHME: Emit a warning if a variable declaration shadows a
4598 * FINISHME: declaration at a higher scope.
4601 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4602 if (type_name
!= NULL
) {
4603 _mesa_glsl_error(& loc
, state
,
4604 "invalid type `%s' in declaration of `%s'",
4605 type_name
, decl
->identifier
);
4607 _mesa_glsl_error(& loc
, state
,
4608 "invalid type in declaration of `%s'",
4614 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4618 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4620 _mesa_glsl_error(& loc
, state
,
4621 "invalid type in declaration of `%s'",
4623 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4628 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4631 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4633 /* The 'varying in' and 'varying out' qualifiers can only be used with
4634 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4637 if (this->type
->qualifier
.flags
.q
.varying
) {
4638 if (this->type
->qualifier
.flags
.q
.in
) {
4639 _mesa_glsl_error(& loc
, state
,
4640 "`varying in' qualifier in declaration of "
4641 "`%s' only valid for geometry shaders using "
4642 "ARB_geometry_shader4 or EXT_geometry_shader4",
4644 } else if (this->type
->qualifier
.flags
.q
.out
) {
4645 _mesa_glsl_error(& loc
, state
,
4646 "`varying out' qualifier in declaration of "
4647 "`%s' only valid for geometry shaders using "
4648 "ARB_geometry_shader4 or EXT_geometry_shader4",
4653 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4655 * "Global variables can only use the qualifiers const,
4656 * attribute, uniform, or varying. Only one may be
4659 * Local variables can only use the qualifier const."
4661 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4662 * any extension that adds the 'layout' keyword.
4664 if (!state
->is_version(130, 300)
4665 && !state
->has_explicit_attrib_location()
4666 && !state
->has_separate_shader_objects()
4667 && !state
->ARB_fragment_coord_conventions_enable
) {
4668 if (this->type
->qualifier
.flags
.q
.out
) {
4669 _mesa_glsl_error(& loc
, state
,
4670 "`out' qualifier in declaration of `%s' "
4671 "only valid for function parameters in %s",
4672 decl
->identifier
, state
->get_version_string());
4674 if (this->type
->qualifier
.flags
.q
.in
) {
4675 _mesa_glsl_error(& loc
, state
,
4676 "`in' qualifier in declaration of `%s' "
4677 "only valid for function parameters in %s",
4678 decl
->identifier
, state
->get_version_string());
4680 /* FINISHME: Test for other invalid qualifiers. */
4683 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4685 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4688 if (this->type
->qualifier
.flags
.q
.invariant
) {
4689 if (!is_varying_var(var
, state
->stage
)) {
4690 _mesa_glsl_error(&loc
, state
,
4691 "`%s' cannot be marked invariant; interfaces between "
4692 "shader stages only", var
->name
);
4696 if (state
->current_function
!= NULL
) {
4697 const char *mode
= NULL
;
4698 const char *extra
= "";
4700 /* There is no need to check for 'inout' here because the parser will
4701 * only allow that in function parameter lists.
4703 if (this->type
->qualifier
.flags
.q
.attribute
) {
4705 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4706 mode
= "subroutine uniform";
4707 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4709 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4711 } else if (this->type
->qualifier
.flags
.q
.in
) {
4713 extra
= " or in function parameter list";
4714 } else if (this->type
->qualifier
.flags
.q
.out
) {
4716 extra
= " or in function parameter list";
4720 _mesa_glsl_error(& loc
, state
,
4721 "%s variable `%s' must be declared at "
4723 mode
, var
->name
, extra
);
4725 } else if (var
->data
.mode
== ir_var_shader_in
) {
4726 var
->data
.read_only
= true;
4728 if (state
->stage
== MESA_SHADER_VERTEX
) {
4729 bool error_emitted
= false;
4731 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4733 * "Vertex shader inputs can only be float, floating-point
4734 * vectors, matrices, signed and unsigned integers and integer
4735 * vectors. Vertex shader inputs can also form arrays of these
4736 * types, but not structures."
4738 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4740 * "Vertex shader inputs can only be float, floating-point
4741 * vectors, matrices, signed and unsigned integers and integer
4742 * vectors. They cannot be arrays or structures."
4744 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4746 * "The attribute qualifier can be used only with float,
4747 * floating-point vectors, and matrices. Attribute variables
4748 * cannot be declared as arrays or structures."
4750 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4752 * "Vertex shader inputs can only be float, floating-point
4753 * vectors, matrices, signed and unsigned integers and integer
4754 * vectors. Vertex shader inputs cannot be arrays or
4757 const glsl_type
*check_type
= var
->type
->without_array();
4759 switch (check_type
->base_type
) {
4760 case GLSL_TYPE_FLOAT
:
4762 case GLSL_TYPE_UINT
:
4764 if (state
->is_version(120, 300))
4766 case GLSL_TYPE_DOUBLE
:
4767 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4771 _mesa_glsl_error(& loc
, state
,
4772 "vertex shader input / attribute cannot have "
4774 var
->type
->is_array() ? "array of " : "",
4776 error_emitted
= true;
4779 if (!error_emitted
&& var
->type
->is_array() &&
4780 !state
->check_version(150, 0, &loc
,
4781 "vertex shader input / attribute "
4782 "cannot have array type")) {
4783 error_emitted
= true;
4785 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4786 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4788 * Geometry shader input variables get the per-vertex values
4789 * written out by vertex shader output variables of the same
4790 * names. Since a geometry shader operates on a set of
4791 * vertices, each input varying variable (or input block, see
4792 * interface blocks below) needs to be declared as an array.
4794 if (!var
->type
->is_array()) {
4795 _mesa_glsl_error(&loc
, state
,
4796 "geometry shader inputs must be arrays");
4799 handle_geometry_shader_input_decl(state
, loc
, var
);
4800 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4801 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4803 * It is a compile-time error to declare a fragment shader
4804 * input with, or that contains, any of the following types:
4808 * * An array of arrays
4809 * * An array of structures
4810 * * A structure containing an array
4811 * * A structure containing a structure
4813 if (state
->es_shader
) {
4814 const glsl_type
*check_type
= var
->type
->without_array();
4815 if (check_type
->is_boolean() ||
4816 check_type
->contains_opaque()) {
4817 _mesa_glsl_error(&loc
, state
,
4818 "fragment shader input cannot have type %s",
4821 if (var
->type
->is_array() &&
4822 var
->type
->fields
.array
->is_array()) {
4823 _mesa_glsl_error(&loc
, state
,
4825 "cannot have an array of arrays",
4826 _mesa_shader_stage_to_string(state
->stage
));
4828 if (var
->type
->is_array() &&
4829 var
->type
->fields
.array
->is_record()) {
4830 _mesa_glsl_error(&loc
, state
,
4831 "fragment shader input "
4832 "cannot have an array of structs");
4834 if (var
->type
->is_record()) {
4835 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4836 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4837 var
->type
->fields
.structure
[i
].type
->is_record())
4838 _mesa_glsl_error(&loc
, state
,
4839 "fragement shader input cannot have "
4840 "a struct that contains an "
4845 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4846 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4847 handle_tess_shader_input_decl(state
, loc
, var
);
4849 } else if (var
->data
.mode
== ir_var_shader_out
) {
4850 const glsl_type
*check_type
= var
->type
->without_array();
4852 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4854 * It is a compile-time error to declare a vertex, tessellation
4855 * evaluation, tessellation control, or geometry shader output
4856 * that contains any of the following:
4858 * * A Boolean type (bool, bvec2 ...)
4861 if (check_type
->is_boolean() || check_type
->contains_opaque())
4862 _mesa_glsl_error(&loc
, state
,
4863 "%s shader output cannot have type %s",
4864 _mesa_shader_stage_to_string(state
->stage
),
4867 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4869 * It is a compile-time error to declare a fragment shader output
4870 * that contains any of the following:
4872 * * A Boolean type (bool, bvec2 ...)
4873 * * A double-precision scalar or vector (double, dvec2 ...)
4878 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4879 if (check_type
->is_record() || check_type
->is_matrix())
4880 _mesa_glsl_error(&loc
, state
,
4881 "fragment shader output "
4882 "cannot have struct or matrix type");
4883 switch (check_type
->base_type
) {
4884 case GLSL_TYPE_UINT
:
4886 case GLSL_TYPE_FLOAT
:
4889 _mesa_glsl_error(&loc
, state
,
4890 "fragment shader output cannot have "
4891 "type %s", check_type
->name
);
4895 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4897 * It is a compile-time error to declare a vertex shader output
4898 * with, or that contains, any of the following types:
4902 * * An array of arrays
4903 * * An array of structures
4904 * * A structure containing an array
4905 * * A structure containing a structure
4907 * It is a compile-time error to declare a fragment shader output
4908 * with, or that contains, any of the following types:
4914 * * An array of array
4916 if (state
->es_shader
) {
4917 if (var
->type
->is_array() &&
4918 var
->type
->fields
.array
->is_array()) {
4919 _mesa_glsl_error(&loc
, state
,
4921 "cannot have an array of arrays",
4922 _mesa_shader_stage_to_string(state
->stage
));
4924 if (state
->stage
== MESA_SHADER_VERTEX
) {
4925 if (var
->type
->is_array() &&
4926 var
->type
->fields
.array
->is_record()) {
4927 _mesa_glsl_error(&loc
, state
,
4928 "vertex shader output "
4929 "cannot have an array of structs");
4931 if (var
->type
->is_record()) {
4932 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4933 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4934 var
->type
->fields
.structure
[i
].type
->is_record())
4935 _mesa_glsl_error(&loc
, state
,
4936 "vertex shader output cannot have a "
4937 "struct that contains an "
4944 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4945 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4947 } else if (var
->type
->contains_subroutine()) {
4948 /* declare subroutine uniforms as hidden */
4949 var
->data
.how_declared
= ir_var_hidden
;
4952 /* From section 4.3.4 of the GLSL 4.00 spec:
4953 * "Input variables may not be declared using the patch in qualifier
4954 * in tessellation control or geometry shaders."
4956 * From section 4.3.6 of the GLSL 4.00 spec:
4957 * "It is an error to use patch out in a vertex, tessellation
4958 * evaluation, or geometry shader."
4960 * This doesn't explicitly forbid using them in a fragment shader, but
4961 * that's probably just an oversight.
4963 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4964 && this->type
->qualifier
.flags
.q
.patch
4965 && this->type
->qualifier
.flags
.q
.in
) {
4967 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4968 "tessellation evaluation shader");
4971 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4972 && this->type
->qualifier
.flags
.q
.patch
4973 && this->type
->qualifier
.flags
.q
.out
) {
4975 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4976 "tessellation control shader");
4979 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4981 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4982 state
->check_precision_qualifiers_allowed(&loc
);
4986 /* If a precision qualifier is allowed on a type, it is allowed on
4987 * an array of that type.
4989 if (!(this->type
->qualifier
.precision
== ast_precision_none
4990 || precision_qualifier_allowed(var
->type
->without_array()))) {
4992 _mesa_glsl_error(&loc
, state
,
4993 "precision qualifiers apply only to floating point"
4994 ", integer and opaque types");
4997 /* From section 4.1.7 of the GLSL 4.40 spec:
4999 * "[Opaque types] can only be declared as function
5000 * parameters or uniform-qualified variables."
5002 if (var_type
->contains_opaque() &&
5003 !this->type
->qualifier
.flags
.q
.uniform
) {
5004 _mesa_glsl_error(&loc
, state
,
5005 "opaque variables must be declared uniform");
5008 /* Process the initializer and add its instructions to a temporary
5009 * list. This list will be added to the instruction stream (below) after
5010 * the declaration is added. This is done because in some cases (such as
5011 * redeclarations) the declaration may not actually be added to the
5012 * instruction stream.
5014 exec_list initializer_instructions
;
5016 /* Examine var name here since var may get deleted in the next call */
5017 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5019 ir_variable
*earlier
=
5020 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5021 false /* allow_all_redeclarations */);
5022 if (earlier
!= NULL
) {
5024 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
5025 _mesa_glsl_error(&loc
, state
,
5026 "`%s' has already been redeclared using "
5027 "gl_PerVertex", earlier
->name
);
5029 earlier
->data
.how_declared
= ir_var_declared_normally
;
5032 if (decl
->initializer
!= NULL
) {
5033 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
5035 &initializer_instructions
, state
);
5037 validate_array_dimensions(var_type
, state
, &loc
);
5040 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5042 * "It is an error to write to a const variable outside of
5043 * its declaration, so they must be initialized when
5046 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5047 _mesa_glsl_error(& loc
, state
,
5048 "const declaration of `%s' must be initialized",
5052 if (state
->es_shader
) {
5053 const glsl_type
*const t
= (earlier
== NULL
)
5054 ? var
->type
: earlier
->type
;
5056 if (t
->is_unsized_array())
5057 /* Section 10.17 of the GLSL ES 1.00 specification states that
5058 * unsized array declarations have been removed from the language.
5059 * Arrays that are sized using an initializer are still explicitly
5060 * sized. However, GLSL ES 1.00 does not allow array
5061 * initializers. That is only allowed in GLSL ES 3.00.
5063 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5065 * "An array type can also be formed without specifying a size
5066 * if the definition includes an initializer:
5068 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5069 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5074 _mesa_glsl_error(& loc
, state
,
5075 "unsized array declarations are not allowed in "
5079 /* If the declaration is not a redeclaration, there are a few additional
5080 * semantic checks that must be applied. In addition, variable that was
5081 * created for the declaration should be added to the IR stream.
5083 if (earlier
== NULL
) {
5084 validate_identifier(decl
->identifier
, loc
, state
);
5086 /* Add the variable to the symbol table. Note that the initializer's
5087 * IR was already processed earlier (though it hasn't been emitted
5088 * yet), without the variable in scope.
5090 * This differs from most C-like languages, but it follows the GLSL
5091 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5094 * "Within a declaration, the scope of a name starts immediately
5095 * after the initializer if present or immediately after the name
5096 * being declared if not."
5098 if (!state
->symbols
->add_variable(var
)) {
5099 YYLTYPE loc
= this->get_location();
5100 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5101 "current scope", decl
->identifier
);
5105 /* Push the variable declaration to the top. It means that all the
5106 * variable declarations will appear in a funny last-to-first order,
5107 * but otherwise we run into trouble if a function is prototyped, a
5108 * global var is decled, then the function is defined with usage of
5109 * the global var. See glslparsertest's CorrectModule.frag.
5111 instructions
->push_head(var
);
5114 instructions
->append_list(&initializer_instructions
);
5118 /* Generally, variable declarations do not have r-values. However,
5119 * one is used for the declaration in
5121 * while (bool b = some_condition()) {
5125 * so we return the rvalue from the last seen declaration here.
5132 ast_parameter_declarator::hir(exec_list
*instructions
,
5133 struct _mesa_glsl_parse_state
*state
)
5136 const struct glsl_type
*type
;
5137 const char *name
= NULL
;
5138 YYLTYPE loc
= this->get_location();
5140 type
= this->type
->glsl_type(& name
, state
);
5144 _mesa_glsl_error(& loc
, state
,
5145 "invalid type `%s' in declaration of `%s'",
5146 name
, this->identifier
);
5148 _mesa_glsl_error(& loc
, state
,
5149 "invalid type in declaration of `%s'",
5153 type
= glsl_type::error_type
;
5156 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5158 * "Functions that accept no input arguments need not use void in the
5159 * argument list because prototypes (or definitions) are required and
5160 * therefore there is no ambiguity when an empty argument list "( )" is
5161 * declared. The idiom "(void)" as a parameter list is provided for
5164 * Placing this check here prevents a void parameter being set up
5165 * for a function, which avoids tripping up checks for main taking
5166 * parameters and lookups of an unnamed symbol.
5168 if (type
->is_void()) {
5169 if (this->identifier
!= NULL
)
5170 _mesa_glsl_error(& loc
, state
,
5171 "named parameter cannot have type `void'");
5177 if (formal_parameter
&& (this->identifier
== NULL
)) {
5178 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5182 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5183 * call already handled the "vec4[..] foo" case.
5185 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5187 if (!type
->is_error() && type
->is_unsized_array()) {
5188 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5190 type
= glsl_type::error_type
;
5194 ir_variable
*var
= new(ctx
)
5195 ir_variable(type
, this->identifier
, ir_var_function_in
);
5197 /* Apply any specified qualifiers to the parameter declaration. Note that
5198 * for function parameters the default mode is 'in'.
5200 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5203 /* From section 4.1.7 of the GLSL 4.40 spec:
5205 * "Opaque variables cannot be treated as l-values; hence cannot
5206 * be used as out or inout function parameters, nor can they be
5209 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5210 && type
->contains_opaque()) {
5211 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5212 "contain opaque variables");
5213 type
= glsl_type::error_type
;
5216 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5218 * "When calling a function, expressions that do not evaluate to
5219 * l-values cannot be passed to parameters declared as out or inout."
5221 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5223 * "Other binary or unary expressions, non-dereferenced arrays,
5224 * function names, swizzles with repeated fields, and constants
5225 * cannot be l-values."
5227 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5228 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5230 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5232 && !state
->check_version(120, 100, &loc
,
5233 "arrays cannot be out or inout parameters")) {
5234 type
= glsl_type::error_type
;
5237 instructions
->push_tail(var
);
5239 /* Parameter declarations do not have r-values.
5246 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5248 exec_list
*ir_parameters
,
5249 _mesa_glsl_parse_state
*state
)
5251 ast_parameter_declarator
*void_param
= NULL
;
5254 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5255 param
->formal_parameter
= formal
;
5256 param
->hir(ir_parameters
, state
);
5264 if ((void_param
!= NULL
) && (count
> 1)) {
5265 YYLTYPE loc
= void_param
->get_location();
5267 _mesa_glsl_error(& loc
, state
,
5268 "`void' parameter must be only parameter");
5274 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5276 /* IR invariants disallow function declarations or definitions
5277 * nested within other function definitions. But there is no
5278 * requirement about the relative order of function declarations
5279 * and definitions with respect to one another. So simply insert
5280 * the new ir_function block at the end of the toplevel instruction
5283 state
->toplevel_ir
->push_tail(f
);
5288 ast_function::hir(exec_list
*instructions
,
5289 struct _mesa_glsl_parse_state
*state
)
5292 ir_function
*f
= NULL
;
5293 ir_function_signature
*sig
= NULL
;
5294 exec_list hir_parameters
;
5295 YYLTYPE loc
= this->get_location();
5297 const char *const name
= identifier
;
5299 /* New functions are always added to the top-level IR instruction stream,
5300 * so this instruction list pointer is ignored. See also emit_function
5303 (void) instructions
;
5305 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5307 * "Function declarations (prototypes) cannot occur inside of functions;
5308 * they must be at global scope, or for the built-in functions, outside
5309 * the global scope."
5311 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5313 * "User defined functions may only be defined within the global scope."
5315 * Note that this language does not appear in GLSL 1.10.
5317 if ((state
->current_function
!= NULL
) &&
5318 state
->is_version(120, 100)) {
5319 YYLTYPE loc
= this->get_location();
5320 _mesa_glsl_error(&loc
, state
,
5321 "declaration of function `%s' not allowed within "
5322 "function body", name
);
5325 validate_identifier(name
, this->get_location(), state
);
5327 /* Convert the list of function parameters to HIR now so that they can be
5328 * used below to compare this function's signature with previously seen
5329 * signatures for functions with the same name.
5331 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5333 & hir_parameters
, state
);
5335 const char *return_type_name
;
5336 const glsl_type
*return_type
=
5337 this->return_type
->glsl_type(& return_type_name
, state
);
5340 YYLTYPE loc
= this->get_location();
5341 _mesa_glsl_error(&loc
, state
,
5342 "function `%s' has undeclared return type `%s'",
5343 name
, return_type_name
);
5344 return_type
= glsl_type::error_type
;
5347 /* ARB_shader_subroutine states:
5348 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5349 * subroutine(...) to a function declaration."
5351 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5352 YYLTYPE loc
= this->get_location();
5353 _mesa_glsl_error(&loc
, state
,
5354 "function declaration `%s' cannot have subroutine prepended",
5358 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5359 * "No qualifier is allowed on the return type of a function."
5361 if (this->return_type
->has_qualifiers(state
)) {
5362 YYLTYPE loc
= this->get_location();
5363 _mesa_glsl_error(& loc
, state
,
5364 "function `%s' return type has qualifiers", name
);
5367 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5369 * "Arrays are allowed as arguments and as the return type. In both
5370 * cases, the array must be explicitly sized."
5372 if (return_type
->is_unsized_array()) {
5373 YYLTYPE loc
= this->get_location();
5374 _mesa_glsl_error(& loc
, state
,
5375 "function `%s' return type array must be explicitly "
5379 /* From section 4.1.7 of the GLSL 4.40 spec:
5381 * "[Opaque types] can only be declared as function parameters
5382 * or uniform-qualified variables."
5384 if (return_type
->contains_opaque()) {
5385 YYLTYPE loc
= this->get_location();
5386 _mesa_glsl_error(&loc
, state
,
5387 "function `%s' return type can't contain an opaque type",
5391 /* Create an ir_function if one doesn't already exist. */
5392 f
= state
->symbols
->get_function(name
);
5394 f
= new(ctx
) ir_function(name
);
5395 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5396 if (!state
->symbols
->add_function(f
)) {
5397 /* This function name shadows a non-function use of the same name. */
5398 YYLTYPE loc
= this->get_location();
5399 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5400 "non-function", name
);
5404 emit_function(state
, f
);
5407 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5409 * "A shader cannot redefine or overload built-in functions."
5411 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5413 * "User code can overload the built-in functions but cannot redefine
5416 if (state
->es_shader
&& state
->language_version
>= 300) {
5417 /* Local shader has no exact candidates; check the built-ins. */
5418 _mesa_glsl_initialize_builtin_functions();
5419 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5420 YYLTYPE loc
= this->get_location();
5421 _mesa_glsl_error(& loc
, state
,
5422 "A shader cannot redefine or overload built-in "
5423 "function `%s' in GLSL ES 3.00", name
);
5428 /* Verify that this function's signature either doesn't match a previously
5429 * seen signature for a function with the same name, or, if a match is found,
5430 * that the previously seen signature does not have an associated definition.
5432 if (state
->es_shader
|| f
->has_user_signature()) {
5433 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5435 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5436 if (badvar
!= NULL
) {
5437 YYLTYPE loc
= this->get_location();
5439 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5440 "qualifiers don't match prototype", name
, badvar
);
5443 if (sig
->return_type
!= return_type
) {
5444 YYLTYPE loc
= this->get_location();
5446 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5447 "match prototype", name
);
5450 if (sig
->is_defined
) {
5451 if (is_definition
) {
5452 YYLTYPE loc
= this->get_location();
5453 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5455 /* We just encountered a prototype that exactly matches a
5456 * function that's already been defined. This is redundant,
5457 * and we should ignore it.
5465 /* Verify the return type of main() */
5466 if (strcmp(name
, "main") == 0) {
5467 if (! return_type
->is_void()) {
5468 YYLTYPE loc
= this->get_location();
5470 _mesa_glsl_error(& loc
, state
, "main() must return void");
5473 if (!hir_parameters
.is_empty()) {
5474 YYLTYPE loc
= this->get_location();
5476 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5480 /* Finish storing the information about this new function in its signature.
5483 sig
= new(ctx
) ir_function_signature(return_type
);
5484 f
->add_signature(sig
);
5487 sig
->replace_parameters(&hir_parameters
);
5490 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5493 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5494 unsigned qual_index
;
5495 if (process_qualifier_constant(state
, &loc
, "index",
5496 this->return_type
->qualifier
.index
,
5498 if (!state
->has_explicit_uniform_location()) {
5499 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5500 "GL_ARB_explicit_uniform_location or "
5502 } else if (qual_index
>= MAX_SUBROUTINES
) {
5503 _mesa_glsl_error(&loc
, state
,
5504 "invalid subroutine index (%d) index must "
5505 "be a number between 0 and "
5506 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5507 MAX_SUBROUTINES
- 1);
5509 f
->subroutine_index
= qual_index
;
5514 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5515 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5516 f
->num_subroutine_types
);
5518 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5519 const struct glsl_type
*type
;
5520 /* the subroutine type must be already declared */
5521 type
= state
->symbols
->get_type(decl
->identifier
);
5523 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5525 f
->subroutine_types
[idx
++] = type
;
5527 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5529 state
->num_subroutines
+ 1);
5530 state
->subroutines
[state
->num_subroutines
] = f
;
5531 state
->num_subroutines
++;
5535 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5536 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5537 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5540 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5542 state
->num_subroutine_types
+ 1);
5543 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5544 state
->num_subroutine_types
++;
5546 f
->is_subroutine
= true;
5549 /* Function declarations (prototypes) do not have r-values.
5556 ast_function_definition::hir(exec_list
*instructions
,
5557 struct _mesa_glsl_parse_state
*state
)
5559 prototype
->is_definition
= true;
5560 prototype
->hir(instructions
, state
);
5562 ir_function_signature
*signature
= prototype
->signature
;
5563 if (signature
== NULL
)
5566 assert(state
->current_function
== NULL
);
5567 state
->current_function
= signature
;
5568 state
->found_return
= false;
5570 /* Duplicate parameters declared in the prototype as concrete variables.
5571 * Add these to the symbol table.
5573 state
->symbols
->push_scope();
5574 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5575 assert(var
->as_variable() != NULL
);
5577 /* The only way a parameter would "exist" is if two parameters have
5580 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5581 YYLTYPE loc
= this->get_location();
5583 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5585 state
->symbols
->add_variable(var
);
5589 /* Convert the body of the function to HIR. */
5590 this->body
->hir(&signature
->body
, state
);
5591 signature
->is_defined
= true;
5593 state
->symbols
->pop_scope();
5595 assert(state
->current_function
== signature
);
5596 state
->current_function
= NULL
;
5598 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5599 YYLTYPE loc
= this->get_location();
5600 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5601 "%s, but no return statement",
5602 signature
->function_name(),
5603 signature
->return_type
->name
);
5606 /* Function definitions do not have r-values.
5613 ast_jump_statement::hir(exec_list
*instructions
,
5614 struct _mesa_glsl_parse_state
*state
)
5621 assert(state
->current_function
);
5623 if (opt_return_value
) {
5624 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5626 /* The value of the return type can be NULL if the shader says
5627 * 'return foo();' and foo() is a function that returns void.
5629 * NOTE: The GLSL spec doesn't say that this is an error. The type
5630 * of the return value is void. If the return type of the function is
5631 * also void, then this should compile without error. Seriously.
5633 const glsl_type
*const ret_type
=
5634 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5636 /* Implicit conversions are not allowed for return values prior to
5637 * ARB_shading_language_420pack.
5639 if (state
->current_function
->return_type
!= ret_type
) {
5640 YYLTYPE loc
= this->get_location();
5642 if (state
->has_420pack()) {
5643 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5645 _mesa_glsl_error(& loc
, state
,
5646 "could not implicitly convert return value "
5647 "to %s, in function `%s'",
5648 state
->current_function
->return_type
->name
,
5649 state
->current_function
->function_name());
5652 _mesa_glsl_error(& loc
, state
,
5653 "`return' with wrong type %s, in function `%s' "
5656 state
->current_function
->function_name(),
5657 state
->current_function
->return_type
->name
);
5659 } else if (state
->current_function
->return_type
->base_type
==
5661 YYLTYPE loc
= this->get_location();
5663 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5664 * specs add a clarification:
5666 * "A void function can only use return without a return argument, even if
5667 * the return argument has void type. Return statements only accept values:
5670 * void func2() { return func1(); } // illegal return statement"
5672 _mesa_glsl_error(& loc
, state
,
5673 "void functions can only use `return' without a "
5677 inst
= new(ctx
) ir_return(ret
);
5679 if (state
->current_function
->return_type
->base_type
!=
5681 YYLTYPE loc
= this->get_location();
5683 _mesa_glsl_error(& loc
, state
,
5684 "`return' with no value, in function %s returning "
5686 state
->current_function
->function_name());
5688 inst
= new(ctx
) ir_return
;
5691 state
->found_return
= true;
5692 instructions
->push_tail(inst
);
5697 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5698 YYLTYPE loc
= this->get_location();
5700 _mesa_glsl_error(& loc
, state
,
5701 "`discard' may only appear in a fragment shader");
5703 instructions
->push_tail(new(ctx
) ir_discard
);
5708 if (mode
== ast_continue
&&
5709 state
->loop_nesting_ast
== NULL
) {
5710 YYLTYPE loc
= this->get_location();
5712 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5713 } else if (mode
== ast_break
&&
5714 state
->loop_nesting_ast
== NULL
&&
5715 state
->switch_state
.switch_nesting_ast
== NULL
) {
5716 YYLTYPE loc
= this->get_location();
5718 _mesa_glsl_error(& loc
, state
,
5719 "break may only appear in a loop or a switch");
5721 /* For a loop, inline the for loop expression again, since we don't
5722 * know where near the end of the loop body the normal copy of it is
5723 * going to be placed. Same goes for the condition for a do-while
5726 if (state
->loop_nesting_ast
!= NULL
&&
5727 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5728 if (state
->loop_nesting_ast
->rest_expression
) {
5729 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5732 if (state
->loop_nesting_ast
->mode
==
5733 ast_iteration_statement::ast_do_while
) {
5734 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5738 if (state
->switch_state
.is_switch_innermost
&&
5739 mode
== ast_continue
) {
5740 /* Set 'continue_inside' to true. */
5741 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5742 ir_dereference_variable
*deref_continue_inside_var
=
5743 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5744 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5747 /* Break out from the switch, continue for the loop will
5748 * be called right after switch. */
5749 ir_loop_jump
*const jump
=
5750 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5751 instructions
->push_tail(jump
);
5753 } else if (state
->switch_state
.is_switch_innermost
&&
5754 mode
== ast_break
) {
5755 /* Force break out of switch by inserting a break. */
5756 ir_loop_jump
*const jump
=
5757 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5758 instructions
->push_tail(jump
);
5760 ir_loop_jump
*const jump
=
5761 new(ctx
) ir_loop_jump((mode
== ast_break
)
5762 ? ir_loop_jump::jump_break
5763 : ir_loop_jump::jump_continue
);
5764 instructions
->push_tail(jump
);
5771 /* Jump instructions do not have r-values.
5778 ast_selection_statement::hir(exec_list
*instructions
,
5779 struct _mesa_glsl_parse_state
*state
)
5783 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5785 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5787 * "Any expression whose type evaluates to a Boolean can be used as the
5788 * conditional expression bool-expression. Vector types are not accepted
5789 * as the expression to if."
5791 * The checks are separated so that higher quality diagnostics can be
5792 * generated for cases where both rules are violated.
5794 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5795 YYLTYPE loc
= this->condition
->get_location();
5797 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5801 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5803 if (then_statement
!= NULL
) {
5804 state
->symbols
->push_scope();
5805 then_statement
->hir(& stmt
->then_instructions
, state
);
5806 state
->symbols
->pop_scope();
5809 if (else_statement
!= NULL
) {
5810 state
->symbols
->push_scope();
5811 else_statement
->hir(& stmt
->else_instructions
, state
);
5812 state
->symbols
->pop_scope();
5815 instructions
->push_tail(stmt
);
5817 /* if-statements do not have r-values.
5824 ast_switch_statement::hir(exec_list
*instructions
,
5825 struct _mesa_glsl_parse_state
*state
)
5829 ir_rvalue
*const test_expression
=
5830 this->test_expression
->hir(instructions
, state
);
5832 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5834 * "The type of init-expression in a switch statement must be a
5837 if (!test_expression
->type
->is_scalar() ||
5838 !test_expression
->type
->is_integer()) {
5839 YYLTYPE loc
= this->test_expression
->get_location();
5841 _mesa_glsl_error(& loc
,
5843 "switch-statement expression must be scalar "
5847 /* Track the switch-statement nesting in a stack-like manner.
5849 struct glsl_switch_state saved
= state
->switch_state
;
5851 state
->switch_state
.is_switch_innermost
= true;
5852 state
->switch_state
.switch_nesting_ast
= this;
5853 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5854 hash_table_pointer_compare
);
5855 state
->switch_state
.previous_default
= NULL
;
5857 /* Initalize is_fallthru state to false.
5859 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5860 state
->switch_state
.is_fallthru_var
=
5861 new(ctx
) ir_variable(glsl_type::bool_type
,
5862 "switch_is_fallthru_tmp",
5864 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5866 ir_dereference_variable
*deref_is_fallthru_var
=
5867 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5868 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5871 /* Initialize continue_inside state to false.
5873 state
->switch_state
.continue_inside
=
5874 new(ctx
) ir_variable(glsl_type::bool_type
,
5875 "continue_inside_tmp",
5877 instructions
->push_tail(state
->switch_state
.continue_inside
);
5879 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5880 ir_dereference_variable
*deref_continue_inside_var
=
5881 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5882 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5885 state
->switch_state
.run_default
=
5886 new(ctx
) ir_variable(glsl_type::bool_type
,
5889 instructions
->push_tail(state
->switch_state
.run_default
);
5891 /* Loop around the switch is used for flow control. */
5892 ir_loop
* loop
= new(ctx
) ir_loop();
5893 instructions
->push_tail(loop
);
5895 /* Cache test expression.
5897 test_to_hir(&loop
->body_instructions
, state
);
5899 /* Emit code for body of switch stmt.
5901 body
->hir(&loop
->body_instructions
, state
);
5903 /* Insert a break at the end to exit loop. */
5904 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5905 loop
->body_instructions
.push_tail(jump
);
5907 /* If we are inside loop, check if continue got called inside switch. */
5908 if (state
->loop_nesting_ast
!= NULL
) {
5909 ir_dereference_variable
*deref_continue_inside
=
5910 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5911 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5912 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5914 if (state
->loop_nesting_ast
!= NULL
) {
5915 if (state
->loop_nesting_ast
->rest_expression
) {
5916 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5919 if (state
->loop_nesting_ast
->mode
==
5920 ast_iteration_statement::ast_do_while
) {
5921 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5924 irif
->then_instructions
.push_tail(jump
);
5925 instructions
->push_tail(irif
);
5928 hash_table_dtor(state
->switch_state
.labels_ht
);
5930 state
->switch_state
= saved
;
5932 /* Switch statements do not have r-values. */
5938 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5939 struct _mesa_glsl_parse_state
*state
)
5943 /* set to true to avoid a duplicate "use of uninitialized variable" warning
5944 * on the switch test case. The first one would be already raised when
5945 * getting the test_expression at ast_switch_statement::hir
5947 test_expression
->set_is_lhs(true);
5948 /* Cache value of test expression. */
5949 ir_rvalue
*const test_val
=
5950 test_expression
->hir(instructions
,
5953 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5956 ir_dereference_variable
*deref_test_var
=
5957 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5959 instructions
->push_tail(state
->switch_state
.test_var
);
5960 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5965 ast_switch_body::hir(exec_list
*instructions
,
5966 struct _mesa_glsl_parse_state
*state
)
5969 stmts
->hir(instructions
, state
);
5971 /* Switch bodies do not have r-values. */
5976 ast_case_statement_list::hir(exec_list
*instructions
,
5977 struct _mesa_glsl_parse_state
*state
)
5979 exec_list default_case
, after_default
, tmp
;
5981 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5982 case_stmt
->hir(&tmp
, state
);
5985 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5986 default_case
.append_list(&tmp
);
5990 /* If default case found, append 'after_default' list. */
5991 if (!default_case
.is_empty())
5992 after_default
.append_list(&tmp
);
5994 instructions
->append_list(&tmp
);
5997 /* Handle the default case. This is done here because default might not be
5998 * the last case. We need to add checks against following cases first to see
5999 * if default should be chosen or not.
6001 if (!default_case
.is_empty()) {
6003 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6004 ir_dereference_variable
*deref_run_default_var
=
6005 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6007 /* Choose to run default case initially, following conditional
6008 * assignments might change this.
6010 ir_assignment
*const init_var
=
6011 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6012 instructions
->push_tail(init_var
);
6014 /* Default case was the last one, no checks required. */
6015 if (after_default
.is_empty()) {
6016 instructions
->append_list(&default_case
);
6020 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6021 ir_assignment
*assign
= ir
->as_assignment();
6026 /* Clone the check between case label and init expression. */
6027 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6028 ir_expression
*clone
= exp
->clone(state
, NULL
);
6030 ir_dereference_variable
*deref_var
=
6031 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6032 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6034 ir_assignment
*const set_false
=
6035 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6037 instructions
->push_tail(set_false
);
6040 /* Append default case and all cases after it. */
6041 instructions
->append_list(&default_case
);
6042 instructions
->append_list(&after_default
);
6045 /* Case statements do not have r-values. */
6050 ast_case_statement::hir(exec_list
*instructions
,
6051 struct _mesa_glsl_parse_state
*state
)
6053 labels
->hir(instructions
, state
);
6055 /* Guard case statements depending on fallthru state. */
6056 ir_dereference_variable
*const deref_fallthru_guard
=
6057 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6058 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6060 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6061 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6063 instructions
->push_tail(test_fallthru
);
6065 /* Case statements do not have r-values. */
6071 ast_case_label_list::hir(exec_list
*instructions
,
6072 struct _mesa_glsl_parse_state
*state
)
6074 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6075 label
->hir(instructions
, state
);
6077 /* Case labels do not have r-values. */
6082 ast_case_label::hir(exec_list
*instructions
,
6083 struct _mesa_glsl_parse_state
*state
)
6087 ir_dereference_variable
*deref_fallthru_var
=
6088 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6090 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6092 /* If not default case, ... */
6093 if (this->test_value
!= NULL
) {
6094 /* Conditionally set fallthru state based on
6095 * comparison of cached test expression value to case label.
6097 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6098 ir_constant
*label_const
= label_rval
->constant_expression_value();
6101 YYLTYPE loc
= this->test_value
->get_location();
6103 _mesa_glsl_error(& loc
, state
,
6104 "switch statement case label must be a "
6105 "constant expression");
6107 /* Stuff a dummy value in to allow processing to continue. */
6108 label_const
= new(ctx
) ir_constant(0);
6110 ast_expression
*previous_label
= (ast_expression
*)
6111 hash_table_find(state
->switch_state
.labels_ht
,
6112 (void *)(uintptr_t)label_const
->value
.u
[0]);
6114 if (previous_label
) {
6115 YYLTYPE loc
= this->test_value
->get_location();
6116 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6118 loc
= previous_label
->get_location();
6119 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6121 hash_table_insert(state
->switch_state
.labels_ht
,
6123 (void *)(uintptr_t)label_const
->value
.u
[0]);
6127 ir_dereference_variable
*deref_test_var
=
6128 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6130 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6135 * From GLSL 4.40 specification section 6.2 ("Selection"):
6137 * "The type of the init-expression value in a switch statement must
6138 * be a scalar int or uint. The type of the constant-expression value
6139 * in a case label also must be a scalar int or uint. When any pair
6140 * of these values is tested for "equal value" and the types do not
6141 * match, an implicit conversion will be done to convert the int to a
6142 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6145 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6146 YYLTYPE loc
= this->test_value
->get_location();
6148 const glsl_type
*type_a
= label_const
->type
;
6149 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6151 /* Check if int->uint implicit conversion is supported. */
6152 bool integer_conversion_supported
=
6153 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6156 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6157 !integer_conversion_supported
) {
6158 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6159 "init-expression and case label (%s != %s)",
6160 type_a
->name
, type_b
->name
);
6162 /* Conversion of the case label. */
6163 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6164 if (!apply_implicit_conversion(glsl_type::uint_type
,
6165 test_cond
->operands
[0], state
))
6166 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6168 /* Conversion of the init-expression value. */
6169 if (!apply_implicit_conversion(glsl_type::uint_type
,
6170 test_cond
->operands
[1], state
))
6171 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6176 ir_assignment
*set_fallthru_on_test
=
6177 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6179 instructions
->push_tail(set_fallthru_on_test
);
6180 } else { /* default case */
6181 if (state
->switch_state
.previous_default
) {
6182 YYLTYPE loc
= this->get_location();
6183 _mesa_glsl_error(& loc
, state
,
6184 "multiple default labels in one switch");
6186 loc
= state
->switch_state
.previous_default
->get_location();
6187 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6189 state
->switch_state
.previous_default
= this;
6191 /* Set fallthru condition on 'run_default' bool. */
6192 ir_dereference_variable
*deref_run_default
=
6193 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6194 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6195 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6199 /* Set falltrhu state. */
6200 ir_assignment
*set_fallthru
=
6201 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6203 instructions
->push_tail(set_fallthru
);
6206 /* Case statements do not have r-values. */
6211 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6212 struct _mesa_glsl_parse_state
*state
)
6216 if (condition
!= NULL
) {
6217 ir_rvalue
*const cond
=
6218 condition
->hir(instructions
, state
);
6221 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6222 YYLTYPE loc
= condition
->get_location();
6224 _mesa_glsl_error(& loc
, state
,
6225 "loop condition must be scalar boolean");
6227 /* As the first code in the loop body, generate a block that looks
6228 * like 'if (!condition) break;' as the loop termination condition.
6230 ir_rvalue
*const not_cond
=
6231 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6233 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6235 ir_jump
*const break_stmt
=
6236 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6238 if_stmt
->then_instructions
.push_tail(break_stmt
);
6239 instructions
->push_tail(if_stmt
);
6246 ast_iteration_statement::hir(exec_list
*instructions
,
6247 struct _mesa_glsl_parse_state
*state
)
6251 /* For-loops and while-loops start a new scope, but do-while loops do not.
6253 if (mode
!= ast_do_while
)
6254 state
->symbols
->push_scope();
6256 if (init_statement
!= NULL
)
6257 init_statement
->hir(instructions
, state
);
6259 ir_loop
*const stmt
= new(ctx
) ir_loop();
6260 instructions
->push_tail(stmt
);
6262 /* Track the current loop nesting. */
6263 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6265 state
->loop_nesting_ast
= this;
6267 /* Likewise, indicate that following code is closest to a loop,
6268 * NOT closest to a switch.
6270 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6271 state
->switch_state
.is_switch_innermost
= false;
6273 if (mode
!= ast_do_while
)
6274 condition_to_hir(&stmt
->body_instructions
, state
);
6277 body
->hir(& stmt
->body_instructions
, state
);
6279 if (rest_expression
!= NULL
)
6280 rest_expression
->hir(& stmt
->body_instructions
, state
);
6282 if (mode
== ast_do_while
)
6283 condition_to_hir(&stmt
->body_instructions
, state
);
6285 if (mode
!= ast_do_while
)
6286 state
->symbols
->pop_scope();
6288 /* Restore previous nesting before returning. */
6289 state
->loop_nesting_ast
= nesting_ast
;
6290 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6292 /* Loops do not have r-values.
6299 * Determine if the given type is valid for establishing a default precision
6302 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6304 * "The precision statement
6306 * precision precision-qualifier type;
6308 * can be used to establish a default precision qualifier. The type field
6309 * can be either int or float or any of the sampler types, and the
6310 * precision-qualifier can be lowp, mediump, or highp."
6312 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6313 * qualifiers on sampler types, but this seems like an oversight (since the
6314 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6315 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6319 is_valid_default_precision_type(const struct glsl_type
*const type
)
6324 switch (type
->base_type
) {
6326 case GLSL_TYPE_FLOAT
:
6327 /* "int" and "float" are valid, but vectors and matrices are not. */
6328 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6329 case GLSL_TYPE_SAMPLER
:
6330 case GLSL_TYPE_IMAGE
:
6331 case GLSL_TYPE_ATOMIC_UINT
:
6340 ast_type_specifier::hir(exec_list
*instructions
,
6341 struct _mesa_glsl_parse_state
*state
)
6343 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6346 YYLTYPE loc
= this->get_location();
6348 /* If this is a precision statement, check that the type to which it is
6349 * applied is either float or int.
6351 * From section 4.5.3 of the GLSL 1.30 spec:
6352 * "The precision statement
6353 * precision precision-qualifier type;
6354 * can be used to establish a default precision qualifier. The type
6355 * field can be either int or float [...]. Any other types or
6356 * qualifiers will result in an error.
6358 if (this->default_precision
!= ast_precision_none
) {
6359 if (!state
->check_precision_qualifiers_allowed(&loc
))
6362 if (this->structure
!= NULL
) {
6363 _mesa_glsl_error(&loc
, state
,
6364 "precision qualifiers do not apply to structures");
6368 if (this->array_specifier
!= NULL
) {
6369 _mesa_glsl_error(&loc
, state
,
6370 "default precision statements do not apply to "
6375 const struct glsl_type
*const type
=
6376 state
->symbols
->get_type(this->type_name
);
6377 if (!is_valid_default_precision_type(type
)) {
6378 _mesa_glsl_error(&loc
, state
,
6379 "default precision statements apply only to "
6380 "float, int, and opaque types");
6384 if (state
->es_shader
) {
6385 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6388 * "Non-precision qualified declarations will use the precision
6389 * qualifier specified in the most recent precision statement
6390 * that is still in scope. The precision statement has the same
6391 * scoping rules as variable declarations. If it is declared
6392 * inside a compound statement, its effect stops at the end of
6393 * the innermost statement it was declared in. Precision
6394 * statements in nested scopes override precision statements in
6395 * outer scopes. Multiple precision statements for the same basic
6396 * type can appear inside the same scope, with later statements
6397 * overriding earlier statements within that scope."
6399 * Default precision specifications follow the same scope rules as
6400 * variables. So, we can track the state of the default precision
6401 * qualifiers in the symbol table, and the rules will just work. This
6402 * is a slight abuse of the symbol table, but it has the semantics
6405 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6406 this->default_precision
);
6409 /* FINISHME: Translate precision statements into IR. */
6413 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6414 * process_record_constructor() can do type-checking on C-style initializer
6415 * expressions of structs, but ast_struct_specifier should only be translated
6416 * to HIR if it is declaring the type of a structure.
6418 * The ->is_declaration field is false for initializers of variables
6419 * declared separately from the struct's type definition.
6421 * struct S { ... }; (is_declaration = true)
6422 * struct T { ... } t = { ... }; (is_declaration = true)
6423 * S s = { ... }; (is_declaration = false)
6425 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6426 return this->structure
->hir(instructions
, state
);
6433 * Process a structure or interface block tree into an array of structure fields
6435 * After parsing, where there are some syntax differnces, structures and
6436 * interface blocks are almost identical. They are similar enough that the
6437 * AST for each can be processed the same way into a set of
6438 * \c glsl_struct_field to describe the members.
6440 * If we're processing an interface block, var_mode should be the type of the
6441 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6442 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6446 * The number of fields processed. A pointer to the array structure fields is
6447 * stored in \c *fields_ret.
6450 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6451 struct _mesa_glsl_parse_state
*state
,
6452 exec_list
*declarations
,
6453 glsl_struct_field
**fields_ret
,
6455 enum glsl_matrix_layout matrix_layout
,
6456 bool allow_reserved_names
,
6457 ir_variable_mode var_mode
,
6458 ast_type_qualifier
*layout
,
6459 unsigned block_stream
,
6460 unsigned block_xfb_buffer
,
6461 unsigned block_xfb_offset
,
6462 unsigned expl_location
,
6463 unsigned expl_align
)
6465 unsigned decl_count
= 0;
6466 unsigned next_offset
= 0;
6468 /* Make an initial pass over the list of fields to determine how
6469 * many there are. Each element in this list is an ast_declarator_list.
6470 * This means that we actually need to count the number of elements in the
6471 * 'declarations' list in each of the elements.
6473 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6474 decl_count
+= decl_list
->declarations
.length();
6477 /* Allocate storage for the fields and process the field
6478 * declarations. As the declarations are processed, try to also convert
6479 * the types to HIR. This ensures that structure definitions embedded in
6480 * other structure definitions or in interface blocks are processed.
6482 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6485 bool first_member
= true;
6486 bool first_member_has_explicit_location
= false;
6489 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6490 const char *type_name
;
6491 YYLTYPE loc
= decl_list
->get_location();
6493 decl_list
->type
->specifier
->hir(instructions
, state
);
6495 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6497 * "Anonymous structures are not supported; so embedded structures
6498 * must have a declarator. A name given to an embedded struct is
6499 * scoped at the same level as the struct it is embedded in."
6501 * The same section of the GLSL 1.20 spec says:
6503 * "Anonymous structures are not supported. Embedded structures are
6506 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6507 * embedded structures in 1.10 only.
6509 if (state
->language_version
!= 110 &&
6510 decl_list
->type
->specifier
->structure
!= NULL
)
6511 _mesa_glsl_error(&loc
, state
,
6512 "embedded structure declarations are not allowed");
6514 const glsl_type
*decl_type
=
6515 decl_list
->type
->glsl_type(& type_name
, state
);
6517 const struct ast_type_qualifier
*const qual
=
6518 &decl_list
->type
->qualifier
;
6520 /* From section 4.3.9 of the GLSL 4.40 spec:
6522 * "[In interface blocks] opaque types are not allowed."
6524 * It should be impossible for decl_type to be NULL here. Cases that
6525 * might naturally lead to decl_type being NULL, especially for the
6526 * is_interface case, will have resulted in compilation having
6527 * already halted due to a syntax error.
6532 if (decl_type
->contains_opaque()) {
6533 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6534 "interface block contains opaque variable");
6537 if (decl_type
->contains_atomic()) {
6538 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6540 * "Members of structures cannot be declared as atomic counter
6543 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6546 if (decl_type
->contains_image()) {
6547 /* FINISHME: Same problem as with atomic counters.
6548 * FINISHME: Request clarification from Khronos and add
6549 * FINISHME: spec quotation here.
6551 _mesa_glsl_error(&loc
, state
, "image in structure");
6555 if (qual
->flags
.q
.explicit_binding
) {
6556 _mesa_glsl_error(&loc
, state
,
6557 "binding layout qualifier cannot be applied "
6558 "to struct or interface block members");
6562 if (!first_member
) {
6563 if (!layout
->flags
.q
.explicit_location
&&
6564 ((first_member_has_explicit_location
&&
6565 !qual
->flags
.q
.explicit_location
) ||
6566 (!first_member_has_explicit_location
&&
6567 qual
->flags
.q
.explicit_location
))) {
6568 _mesa_glsl_error(&loc
, state
,
6569 "when block-level location layout qualifier "
6570 "is not supplied either all members must "
6571 "have a location layout qualifier or all "
6572 "members must not have a location layout "
6576 first_member
= false;
6577 first_member_has_explicit_location
=
6578 qual
->flags
.q
.explicit_location
;
6582 if (qual
->flags
.q
.std140
||
6583 qual
->flags
.q
.std430
||
6584 qual
->flags
.q
.packed
||
6585 qual
->flags
.q
.shared
) {
6586 _mesa_glsl_error(&loc
, state
,
6587 "uniform/shader storage block layout qualifiers "
6588 "std140, std430, packed, and shared can only be "
6589 "applied to uniform/shader storage blocks, not "
6593 if (qual
->flags
.q
.constant
) {
6594 _mesa_glsl_error(&loc
, state
,
6595 "const storage qualifier cannot be applied "
6596 "to struct or interface block members");
6599 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6601 * "A block member may be declared with a stream identifier, but
6602 * the specified stream must match the stream associated with the
6603 * containing block."
6605 if (qual
->flags
.q
.explicit_stream
) {
6606 unsigned qual_stream
;
6607 if (process_qualifier_constant(state
, &loc
, "stream",
6608 qual
->stream
, &qual_stream
) &&
6609 qual_stream
!= block_stream
) {
6610 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6611 "interface block member does not match "
6612 "the interface block (%u vs %u)", qual_stream
,
6618 unsigned explicit_xfb_buffer
= 0;
6619 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6620 unsigned qual_xfb_buffer
;
6621 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6622 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6623 explicit_xfb_buffer
= 1;
6624 if (qual_xfb_buffer
!= block_xfb_buffer
)
6625 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6626 "interface block member does not match "
6627 "the interface block (%u vs %u)",
6628 qual_xfb_buffer
, block_xfb_buffer
);
6630 xfb_buffer
= (int) qual_xfb_buffer
;
6633 explicit_xfb_buffer
= layout
->flags
.q
.xfb_buffer
;
6634 xfb_buffer
= (int) block_xfb_buffer
;
6637 int xfb_stride
= -1;
6638 if (qual
->flags
.q
.explicit_xfb_stride
) {
6639 unsigned qual_xfb_stride
;
6640 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6641 qual
->xfb_stride
, &qual_xfb_stride
)) {
6642 xfb_stride
= (int) qual_xfb_stride
;
6646 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6647 _mesa_glsl_error(&loc
, state
,
6648 "interpolation qualifiers cannot be used "
6649 "with uniform interface blocks");
6652 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6653 qual
->has_auxiliary_storage()) {
6654 _mesa_glsl_error(&loc
, state
,
6655 "auxiliary storage qualifiers cannot be used "
6656 "in uniform blocks or structures.");
6659 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6660 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6661 _mesa_glsl_error(&loc
, state
,
6662 "row_major and column_major can only be "
6663 "applied to interface blocks");
6665 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6668 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6669 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6670 "readonly and writeonly.");
6673 foreach_list_typed (ast_declaration
, decl
, link
,
6674 &decl_list
->declarations
) {
6675 YYLTYPE loc
= decl
->get_location();
6677 if (!allow_reserved_names
)
6678 validate_identifier(decl
->identifier
, loc
, state
);
6680 const struct glsl_type
*field_type
=
6681 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6682 validate_array_dimensions(field_type
, state
, &loc
);
6683 fields
[i
].type
= field_type
;
6684 fields
[i
].name
= decl
->identifier
;
6685 fields
[i
].interpolation
=
6686 interpret_interpolation_qualifier(qual
, field_type
,
6687 var_mode
, state
, &loc
);
6688 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6689 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6690 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6691 fields
[i
].precision
= qual
->precision
;
6692 fields
[i
].offset
= -1;
6693 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6694 fields
[i
].xfb_buffer
= xfb_buffer
;
6695 fields
[i
].xfb_stride
= xfb_stride
;
6697 if (qual
->flags
.q
.explicit_location
) {
6698 unsigned qual_location
;
6699 if (process_qualifier_constant(state
, &loc
, "location",
6700 qual
->location
, &qual_location
)) {
6701 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6702 expl_location
= fields
[i
].location
+
6703 fields
[i
].type
->count_attribute_slots(false);
6706 if (layout
&& layout
->flags
.q
.explicit_location
) {
6707 fields
[i
].location
= expl_location
;
6708 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6710 fields
[i
].location
= -1;
6714 /* Offset can only be used with std430 and std140 layouts an initial
6715 * value of 0 is used for error detection.
6721 if (qual
->flags
.q
.row_major
||
6722 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6728 if(layout
->flags
.q
.std140
) {
6729 align
= field_type
->std140_base_alignment(row_major
);
6730 size
= field_type
->std140_size(row_major
);
6731 } else if (layout
->flags
.q
.std430
) {
6732 align
= field_type
->std430_base_alignment(row_major
);
6733 size
= field_type
->std430_size(row_major
);
6737 if (qual
->flags
.q
.explicit_offset
) {
6738 unsigned qual_offset
;
6739 if (process_qualifier_constant(state
, &loc
, "offset",
6740 qual
->offset
, &qual_offset
)) {
6741 if (align
!= 0 && size
!= 0) {
6742 if (next_offset
> qual_offset
)
6743 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6744 "offset overlaps previous member");
6746 if (qual_offset
% align
) {
6747 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6748 "must be a multiple of the base "
6749 "alignment of %s", field_type
->name
);
6751 fields
[i
].offset
= qual_offset
;
6752 next_offset
= glsl_align(qual_offset
+ size
, align
);
6754 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6755 "with std430 and std140 layouts");
6760 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6761 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6763 if (align
== 0 || size
== 0) {
6764 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6765 "std430 and std140 layouts");
6766 } else if (qual
->flags
.q
.explicit_align
) {
6767 unsigned member_align
;
6768 if (process_qualifier_constant(state
, &loc
, "align",
6769 qual
->align
, &member_align
)) {
6770 if (member_align
== 0 ||
6771 member_align
& (member_align
- 1)) {
6772 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6773 "in not a power of 2");
6775 fields
[i
].offset
= glsl_align(offset
, member_align
);
6776 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6780 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6781 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6785 if (!qual
->flags
.q
.explicit_offset
) {
6786 if (align
!= 0 && size
!= 0)
6787 next_offset
= glsl_align(next_offset
+ size
, align
);
6790 /* From the ARB_enhanced_layouts spec:
6792 * "The given offset applies to the first component of the first
6793 * member of the qualified entity. Then, within the qualified
6794 * entity, subsequent components are each assigned, in order, to
6795 * the next available offset aligned to a multiple of that
6796 * component's size. Aggregate types are flattened down to the
6797 * component level to get this sequence of components."
6799 if (qual
->flags
.q
.explicit_xfb_offset
) {
6800 unsigned xfb_offset
;
6801 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
6802 qual
->offset
, &xfb_offset
)) {
6803 fields
[i
].offset
= xfb_offset
;
6804 block_xfb_offset
= fields
[i
].offset
+
6805 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6808 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
6809 unsigned align
= field_type
->is_double() ? 8 : 4;
6810 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
6812 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6816 /* Propogate row- / column-major information down the fields of the
6817 * structure or interface block. Structures need this data because
6818 * the structure may contain a structure that contains ... a matrix
6819 * that need the proper layout.
6821 if (is_interface
&& layout
&&
6822 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6823 (field_type
->without_array()->is_matrix()
6824 || field_type
->without_array()->is_record())) {
6825 /* If no layout is specified for the field, inherit the layout
6828 fields
[i
].matrix_layout
= matrix_layout
;
6830 if (qual
->flags
.q
.row_major
)
6831 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6832 else if (qual
->flags
.q
.column_major
)
6833 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6835 /* If we're processing an uniform or buffer block, the matrix
6836 * layout must be decided by this point.
6838 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6839 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6842 /* Image qualifiers are allowed on buffer variables, which can only
6843 * be defined inside shader storage buffer objects
6845 if (layout
&& var_mode
== ir_var_shader_storage
) {
6846 /* For readonly and writeonly qualifiers the field definition,
6847 * if set, overwrites the layout qualifier.
6849 if (qual
->flags
.q
.read_only
) {
6850 fields
[i
].image_read_only
= true;
6851 fields
[i
].image_write_only
= false;
6852 } else if (qual
->flags
.q
.write_only
) {
6853 fields
[i
].image_read_only
= false;
6854 fields
[i
].image_write_only
= true;
6856 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6857 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6860 /* For other qualifiers, we set the flag if either the layout
6861 * qualifier or the field qualifier are set
6863 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6864 layout
->flags
.q
.coherent
;
6865 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6866 layout
->flags
.q
._volatile
;
6867 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6868 layout
->flags
.q
.restrict_flag
;
6875 assert(i
== decl_count
);
6877 *fields_ret
= fields
;
6883 ast_struct_specifier::hir(exec_list
*instructions
,
6884 struct _mesa_glsl_parse_state
*state
)
6886 YYLTYPE loc
= this->get_location();
6888 unsigned expl_location
= 0;
6889 if (layout
&& layout
->flags
.q
.explicit_location
) {
6890 if (!process_qualifier_constant(state
, &loc
, "location",
6891 layout
->location
, &expl_location
)) {
6894 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6898 glsl_struct_field
*fields
;
6899 unsigned decl_count
=
6900 ast_process_struct_or_iface_block_members(instructions
,
6902 &this->declarations
,
6905 GLSL_MATRIX_LAYOUT_INHERITED
,
6906 false /* allow_reserved_names */,
6909 0, /* for interface only */
6910 0, /* for interface only */
6911 0, /* for interface only */
6913 0 /* for interface only */);
6915 validate_identifier(this->name
, loc
, state
);
6917 const glsl_type
*t
=
6918 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6920 if (!state
->symbols
->add_type(name
, t
)) {
6921 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6923 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6925 state
->num_user_structures
+ 1);
6927 s
[state
->num_user_structures
] = t
;
6928 state
->user_structures
= s
;
6929 state
->num_user_structures
++;
6933 /* Structure type definitions do not have r-values.
6940 * Visitor class which detects whether a given interface block has been used.
6942 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6945 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6946 : mode(mode
), block(block
), found(false)
6950 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6952 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6956 return visit_continue
;
6959 bool usage_found() const
6965 ir_variable_mode mode
;
6966 const glsl_type
*block
;
6971 is_unsized_array_last_element(ir_variable
*v
)
6973 const glsl_type
*interface_type
= v
->get_interface_type();
6974 int length
= interface_type
->length
;
6976 assert(v
->type
->is_unsized_array());
6978 /* Check if it is the last element of the interface */
6979 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6985 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
6987 var
->data
.image_read_only
= field
.image_read_only
;
6988 var
->data
.image_write_only
= field
.image_write_only
;
6989 var
->data
.image_coherent
= field
.image_coherent
;
6990 var
->data
.image_volatile
= field
.image_volatile
;
6991 var
->data
.image_restrict
= field
.image_restrict
;
6995 ast_interface_block::hir(exec_list
*instructions
,
6996 struct _mesa_glsl_parse_state
*state
)
6998 YYLTYPE loc
= this->get_location();
7000 /* Interface blocks must be declared at global scope */
7001 if (state
->current_function
!= NULL
) {
7002 _mesa_glsl_error(&loc
, state
,
7003 "Interface block `%s' must be declared "
7008 if (!this->layout
.flags
.q
.buffer
&&
7009 this->layout
.flags
.q
.std430
) {
7010 _mesa_glsl_error(&loc
, state
,
7011 "std430 storage block layout qualifier is supported "
7012 "only for shader storage blocks");
7015 /* The ast_interface_block has a list of ast_declarator_lists. We
7016 * need to turn those into ir_variables with an association
7017 * with this uniform block.
7019 enum glsl_interface_packing packing
;
7020 if (this->layout
.flags
.q
.shared
) {
7021 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7022 } else if (this->layout
.flags
.q
.packed
) {
7023 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7024 } else if (this->layout
.flags
.q
.std430
) {
7025 packing
= GLSL_INTERFACE_PACKING_STD430
;
7027 /* The default layout is std140.
7029 packing
= GLSL_INTERFACE_PACKING_STD140
;
7032 ir_variable_mode var_mode
;
7033 const char *iface_type_name
;
7034 if (this->layout
.flags
.q
.in
) {
7035 var_mode
= ir_var_shader_in
;
7036 iface_type_name
= "in";
7037 } else if (this->layout
.flags
.q
.out
) {
7038 var_mode
= ir_var_shader_out
;
7039 iface_type_name
= "out";
7040 } else if (this->layout
.flags
.q
.uniform
) {
7041 var_mode
= ir_var_uniform
;
7042 iface_type_name
= "uniform";
7043 } else if (this->layout
.flags
.q
.buffer
) {
7044 var_mode
= ir_var_shader_storage
;
7045 iface_type_name
= "buffer";
7047 var_mode
= ir_var_auto
;
7048 iface_type_name
= "UNKNOWN";
7049 assert(!"interface block layout qualifier not found!");
7052 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7053 if (this->layout
.flags
.q
.row_major
)
7054 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7055 else if (this->layout
.flags
.q
.column_major
)
7056 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7058 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7059 exec_list declared_variables
;
7060 glsl_struct_field
*fields
;
7062 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7063 * that we don't have incompatible qualifiers
7065 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7066 _mesa_glsl_error(&loc
, state
,
7067 "Interface block sets both readonly and writeonly");
7070 if (this->layout
.flags
.q
.explicit_component
) {
7071 _mesa_glsl_error(&loc
, state
, "component layout qualifier cannot be "
7072 "applied to a matrix, a structure, a block, or an "
7073 "array containing any of these.");
7076 unsigned qual_stream
;
7077 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7079 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7080 /* If the stream qualifier is invalid it doesn't make sense to continue
7081 * on and try to compare stream layouts on member variables against it
7082 * so just return early.
7087 unsigned qual_xfb_buffer
;
7088 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7089 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7090 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7094 unsigned qual_xfb_offset
;
7095 if (layout
.flags
.q
.explicit_xfb_offset
) {
7096 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7097 layout
.offset
, &qual_xfb_offset
)) {
7102 unsigned qual_xfb_stride
;
7103 if (layout
.flags
.q
.explicit_xfb_stride
) {
7104 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7105 layout
.xfb_stride
, &qual_xfb_stride
)) {
7110 unsigned expl_location
= 0;
7111 if (layout
.flags
.q
.explicit_location
) {
7112 if (!process_qualifier_constant(state
, &loc
, "location",
7113 layout
.location
, &expl_location
)) {
7116 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7120 unsigned expl_align
= 0;
7121 if (layout
.flags
.q
.explicit_align
) {
7122 if (!process_qualifier_constant(state
, &loc
, "align",
7123 layout
.align
, &expl_align
)) {
7126 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7127 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7134 unsigned int num_variables
=
7135 ast_process_struct_or_iface_block_members(&declared_variables
,
7137 &this->declarations
,
7141 redeclaring_per_vertex
,
7150 if (!redeclaring_per_vertex
) {
7151 validate_identifier(this->block_name
, loc
, state
);
7153 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7155 * "Block names have no other use within a shader beyond interface
7156 * matching; it is a compile-time error to use a block name at global
7157 * scope for anything other than as a block name."
7159 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7160 if (var
&& !var
->type
->is_interface()) {
7161 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7162 "already used in the scope.",
7167 const glsl_type
*earlier_per_vertex
= NULL
;
7168 if (redeclaring_per_vertex
) {
7169 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7170 * the named interface block gl_in, we can find it by looking at the
7171 * previous declaration of gl_in. Otherwise we can find it by looking
7172 * at the previous decalartion of any of the built-in outputs,
7175 * Also check that the instance name and array-ness of the redeclaration
7179 case ir_var_shader_in
:
7180 if (ir_variable
*earlier_gl_in
=
7181 state
->symbols
->get_variable("gl_in")) {
7182 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7184 _mesa_glsl_error(&loc
, state
,
7185 "redeclaration of gl_PerVertex input not allowed "
7187 _mesa_shader_stage_to_string(state
->stage
));
7189 if (this->instance_name
== NULL
||
7190 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7191 !this->array_specifier
->is_single_dimension()) {
7192 _mesa_glsl_error(&loc
, state
,
7193 "gl_PerVertex input must be redeclared as "
7197 case ir_var_shader_out
:
7198 if (ir_variable
*earlier_gl_Position
=
7199 state
->symbols
->get_variable("gl_Position")) {
7200 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7201 } else if (ir_variable
*earlier_gl_out
=
7202 state
->symbols
->get_variable("gl_out")) {
7203 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7205 _mesa_glsl_error(&loc
, state
,
7206 "redeclaration of gl_PerVertex output not "
7207 "allowed in the %s shader",
7208 _mesa_shader_stage_to_string(state
->stage
));
7210 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7211 if (this->instance_name
== NULL
||
7212 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7213 _mesa_glsl_error(&loc
, state
,
7214 "gl_PerVertex output must be redeclared as "
7218 if (this->instance_name
!= NULL
) {
7219 _mesa_glsl_error(&loc
, state
,
7220 "gl_PerVertex output may not be redeclared with "
7221 "an instance name");
7226 _mesa_glsl_error(&loc
, state
,
7227 "gl_PerVertex must be declared as an input or an "
7232 if (earlier_per_vertex
== NULL
) {
7233 /* An error has already been reported. Bail out to avoid null
7234 * dereferences later in this function.
7239 /* Copy locations from the old gl_PerVertex interface block. */
7240 for (unsigned i
= 0; i
< num_variables
; i
++) {
7241 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7243 _mesa_glsl_error(&loc
, state
,
7244 "redeclaration of gl_PerVertex must be a subset "
7245 "of the built-in members of gl_PerVertex");
7247 fields
[i
].location
=
7248 earlier_per_vertex
->fields
.structure
[j
].location
;
7250 earlier_per_vertex
->fields
.structure
[j
].offset
;
7251 fields
[i
].interpolation
=
7252 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7253 fields
[i
].centroid
=
7254 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7256 earlier_per_vertex
->fields
.structure
[j
].sample
;
7258 earlier_per_vertex
->fields
.structure
[j
].patch
;
7259 fields
[i
].precision
=
7260 earlier_per_vertex
->fields
.structure
[j
].precision
;
7261 fields
[i
].explicit_xfb_buffer
=
7262 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7263 fields
[i
].xfb_buffer
=
7264 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7265 fields
[i
].xfb_stride
=
7266 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7270 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7273 * If a built-in interface block is redeclared, it must appear in
7274 * the shader before any use of any member included in the built-in
7275 * declaration, or a compilation error will result.
7277 * This appears to be a clarification to the behaviour established for
7278 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7279 * regardless of GLSL version.
7281 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7282 v
.run(instructions
);
7283 if (v
.usage_found()) {
7284 _mesa_glsl_error(&loc
, state
,
7285 "redeclaration of a built-in interface block must "
7286 "appear before any use of any member of the "
7291 const glsl_type
*block_type
=
7292 glsl_type::get_interface_instance(fields
,
7297 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7299 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7300 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7303 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7304 YYLTYPE loc
= this->get_location();
7305 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7306 "already taken in the current scope",
7307 this->block_name
, iface_type_name
);
7310 /* Since interface blocks cannot contain statements, it should be
7311 * impossible for the block to generate any instructions.
7313 assert(declared_variables
.is_empty());
7315 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7317 * Geometry shader input variables get the per-vertex values written
7318 * out by vertex shader output variables of the same names. Since a
7319 * geometry shader operates on a set of vertices, each input varying
7320 * variable (or input block, see interface blocks below) needs to be
7321 * declared as an array.
7323 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7324 var_mode
== ir_var_shader_in
) {
7325 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7326 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7327 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7328 this->array_specifier
== NULL
&&
7329 var_mode
== ir_var_shader_in
) {
7330 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7331 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7332 this->array_specifier
== NULL
&&
7333 var_mode
== ir_var_shader_out
) {
7334 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7338 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7341 * "If an instance name (instance-name) is used, then it puts all the
7342 * members inside a scope within its own name space, accessed with the
7343 * field selector ( . ) operator (analogously to structures)."
7345 if (this->instance_name
) {
7346 if (redeclaring_per_vertex
) {
7347 /* When a built-in in an unnamed interface block is redeclared,
7348 * get_variable_being_redeclared() calls
7349 * check_builtin_array_max_size() to make sure that built-in array
7350 * variables aren't redeclared to illegal sizes. But we're looking
7351 * at a redeclaration of a named built-in interface block. So we
7352 * have to manually call check_builtin_array_max_size() for all parts
7353 * of the interface that are arrays.
7355 for (unsigned i
= 0; i
< num_variables
; i
++) {
7356 if (fields
[i
].type
->is_array()) {
7357 const unsigned size
= fields
[i
].type
->array_size();
7358 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7362 validate_identifier(this->instance_name
, loc
, state
);
7367 if (this->array_specifier
!= NULL
) {
7368 const glsl_type
*block_array_type
=
7369 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7371 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7373 * For uniform blocks declared an array, each individual array
7374 * element corresponds to a separate buffer object backing one
7375 * instance of the block. As the array size indicates the number
7376 * of buffer objects needed, uniform block array declarations
7377 * must specify an array size.
7379 * And a few paragraphs later:
7381 * Geometry shader input blocks must be declared as arrays and
7382 * follow the array declaration and linking rules for all
7383 * geometry shader inputs. All other input and output block
7384 * arrays must specify an array size.
7386 * The same applies to tessellation shaders.
7388 * The upshot of this is that the only circumstance where an
7389 * interface array size *doesn't* need to be specified is on a
7390 * geometry shader input, tessellation control shader input,
7391 * tessellation control shader output, and tessellation evaluation
7394 if (block_array_type
->is_unsized_array()) {
7395 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7396 state
->stage
== MESA_SHADER_TESS_CTRL
||
7397 state
->stage
== MESA_SHADER_TESS_EVAL
;
7398 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7400 if (this->layout
.flags
.q
.in
) {
7402 _mesa_glsl_error(&loc
, state
,
7403 "unsized input block arrays not allowed in "
7405 _mesa_shader_stage_to_string(state
->stage
));
7406 } else if (this->layout
.flags
.q
.out
) {
7408 _mesa_glsl_error(&loc
, state
,
7409 "unsized output block arrays not allowed in "
7411 _mesa_shader_stage_to_string(state
->stage
));
7413 /* by elimination, this is a uniform block array */
7414 _mesa_glsl_error(&loc
, state
,
7415 "unsized uniform block arrays not allowed in "
7417 _mesa_shader_stage_to_string(state
->stage
));
7421 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7423 * * Arrays of arrays of blocks are not allowed
7425 if (state
->es_shader
&& block_array_type
->is_array() &&
7426 block_array_type
->fields
.array
->is_array()) {
7427 _mesa_glsl_error(&loc
, state
,
7428 "arrays of arrays interface blocks are "
7432 var
= new(state
) ir_variable(block_array_type
,
7433 this->instance_name
,
7436 var
= new(state
) ir_variable(block_type
,
7437 this->instance_name
,
7441 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7442 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7444 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7445 var
->data
.read_only
= true;
7447 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7448 handle_geometry_shader_input_decl(state
, loc
, var
);
7449 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7450 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7451 handle_tess_shader_input_decl(state
, loc
, var
);
7452 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7453 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7455 for (unsigned i
= 0; i
< num_variables
; i
++) {
7456 if (fields
[i
].type
->is_unsized_array()) {
7457 if (var_mode
== ir_var_shader_storage
) {
7458 if (i
!= (num_variables
- 1)) {
7459 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7460 "only last member of a shader storage block "
7461 "can be defined as unsized array",
7465 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7467 * "If an array is declared as the last member of a shader storage
7468 * block and the size is not specified at compile-time, it is
7469 * sized at run-time. In all other cases, arrays are sized only
7472 if (state
->es_shader
) {
7473 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7474 "only last member of a shader storage block "
7475 "can be defined as unsized array",
7481 if (var
->data
.mode
== ir_var_shader_storage
)
7482 apply_memory_qualifiers(var
, fields
[i
]);
7485 if (ir_variable
*earlier
=
7486 state
->symbols
->get_variable(this->instance_name
)) {
7487 if (!redeclaring_per_vertex
) {
7488 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7489 this->instance_name
);
7491 earlier
->data
.how_declared
= ir_var_declared_normally
;
7492 earlier
->type
= var
->type
;
7493 earlier
->reinit_interface_type(block_type
);
7496 if (this->layout
.flags
.q
.explicit_binding
) {
7497 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7501 var
->data
.stream
= qual_stream
;
7502 if (layout
.flags
.q
.explicit_location
) {
7503 var
->data
.location
= expl_location
;
7504 var
->data
.explicit_location
= true;
7507 state
->symbols
->add_variable(var
);
7508 instructions
->push_tail(var
);
7511 /* In order to have an array size, the block must also be declared with
7514 assert(this->array_specifier
== NULL
);
7516 for (unsigned i
= 0; i
< num_variables
; i
++) {
7518 new(state
) ir_variable(fields
[i
].type
,
7519 ralloc_strdup(state
, fields
[i
].name
),
7521 var
->data
.interpolation
= fields
[i
].interpolation
;
7522 var
->data
.centroid
= fields
[i
].centroid
;
7523 var
->data
.sample
= fields
[i
].sample
;
7524 var
->data
.patch
= fields
[i
].patch
;
7525 var
->data
.stream
= qual_stream
;
7526 var
->data
.location
= fields
[i
].location
;
7528 if (fields
[i
].location
!= -1)
7529 var
->data
.explicit_location
= true;
7531 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7532 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7534 if (fields
[i
].offset
!= -1)
7535 var
->data
.explicit_xfb_offset
= true;
7536 var
->data
.offset
= fields
[i
].offset
;
7538 var
->init_interface_type(block_type
);
7540 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7541 var
->data
.read_only
= true;
7543 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7544 if (state
->es_shader
) {
7545 var
->data
.precision
=
7546 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7550 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7551 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7552 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7554 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7557 if (var
->data
.mode
== ir_var_shader_storage
)
7558 apply_memory_qualifiers(var
, fields
[i
]);
7560 /* Examine var name here since var may get deleted in the next call */
7561 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7563 if (redeclaring_per_vertex
) {
7564 ir_variable
*earlier
=
7565 get_variable_being_redeclared(var
, loc
, state
,
7566 true /* allow_all_redeclarations */);
7567 if (!var_is_gl_id
|| earlier
== NULL
) {
7568 _mesa_glsl_error(&loc
, state
,
7569 "redeclaration of gl_PerVertex can only "
7570 "include built-in variables");
7571 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7572 _mesa_glsl_error(&loc
, state
,
7573 "`%s' has already been redeclared",
7576 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7577 earlier
->reinit_interface_type(block_type
);
7582 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7583 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7585 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7586 * The UBO declaration itself doesn't get an ir_variable unless it
7587 * has an instance name. This is ugly.
7589 if (this->layout
.flags
.q
.explicit_binding
) {
7590 apply_explicit_binding(state
, &loc
, var
,
7591 var
->get_interface_type(), &this->layout
);
7594 if (var
->type
->is_unsized_array()) {
7595 if (var
->is_in_shader_storage_block()) {
7596 if (!is_unsized_array_last_element(var
)) {
7597 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7598 "only last member of a shader storage block "
7599 "can be defined as unsized array",
7602 var
->data
.from_ssbo_unsized_array
= true;
7604 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7606 * "If an array is declared as the last member of a shader storage
7607 * block and the size is not specified at compile-time, it is
7608 * sized at run-time. In all other cases, arrays are sized only
7611 if (state
->es_shader
) {
7612 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7613 "only last member of a shader storage block "
7614 "can be defined as unsized array",
7620 state
->symbols
->add_variable(var
);
7621 instructions
->push_tail(var
);
7624 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7625 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7627 * It is also a compilation error ... to redeclare a built-in
7628 * block and then use a member from that built-in block that was
7629 * not included in the redeclaration.
7631 * This appears to be a clarification to the behaviour established
7632 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7633 * behaviour regardless of GLSL version.
7635 * To prevent the shader from using a member that was not included in
7636 * the redeclaration, we disable any ir_variables that are still
7637 * associated with the old declaration of gl_PerVertex (since we've
7638 * already updated all of the variables contained in the new
7639 * gl_PerVertex to point to it).
7641 * As a side effect this will prevent
7642 * validate_intrastage_interface_blocks() from getting confused and
7643 * thinking there are conflicting definitions of gl_PerVertex in the
7646 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7647 ir_variable
*const var
= node
->as_variable();
7649 var
->get_interface_type() == earlier_per_vertex
&&
7650 var
->data
.mode
== var_mode
) {
7651 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7652 _mesa_glsl_error(&loc
, state
,
7653 "redeclaration of gl_PerVertex cannot "
7654 "follow a redeclaration of `%s'",
7657 state
->symbols
->disable_variable(var
->name
);
7669 ast_tcs_output_layout::hir(exec_list
*instructions
,
7670 struct _mesa_glsl_parse_state
*state
)
7672 YYLTYPE loc
= this->get_location();
7674 unsigned num_vertices
;
7675 if (!state
->out_qualifier
->vertices
->
7676 process_qualifier_constant(state
, "vertices", &num_vertices
,
7678 /* return here to stop cascading incorrect error messages */
7682 /* If any shader outputs occurred before this declaration and specified an
7683 * array size, make sure the size they specified is consistent with the
7686 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7687 _mesa_glsl_error(&loc
, state
,
7688 "this tessellation control shader output layout "
7689 "specifies %u vertices, but a previous output "
7690 "is declared with size %u",
7691 num_vertices
, state
->tcs_output_size
);
7695 state
->tcs_output_vertices_specified
= true;
7697 /* If any shader outputs occurred before this declaration and did not
7698 * specify an array size, their size is determined now.
7700 foreach_in_list (ir_instruction
, node
, instructions
) {
7701 ir_variable
*var
= node
->as_variable();
7702 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7705 /* Note: Not all tessellation control shader output are arrays. */
7706 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7709 if (var
->data
.max_array_access
>= num_vertices
) {
7710 _mesa_glsl_error(&loc
, state
,
7711 "this tessellation control shader output layout "
7712 "specifies %u vertices, but an access to element "
7713 "%u of output `%s' already exists", num_vertices
,
7714 var
->data
.max_array_access
, var
->name
);
7716 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7726 ast_gs_input_layout::hir(exec_list
*instructions
,
7727 struct _mesa_glsl_parse_state
*state
)
7729 YYLTYPE loc
= this->get_location();
7731 /* If any geometry input layout declaration preceded this one, make sure it
7732 * was consistent with this one.
7734 if (state
->gs_input_prim_type_specified
&&
7735 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7736 _mesa_glsl_error(&loc
, state
,
7737 "geometry shader input layout does not match"
7738 " previous declaration");
7742 /* If any shader inputs occurred before this declaration and specified an
7743 * array size, make sure the size they specified is consistent with the
7746 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7747 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7748 _mesa_glsl_error(&loc
, state
,
7749 "this geometry shader input layout implies %u vertices"
7750 " per primitive, but a previous input is declared"
7751 " with size %u", num_vertices
, state
->gs_input_size
);
7755 state
->gs_input_prim_type_specified
= true;
7757 /* If any shader inputs occurred before this declaration and did not
7758 * specify an array size, their size is determined now.
7760 foreach_in_list(ir_instruction
, node
, instructions
) {
7761 ir_variable
*var
= node
->as_variable();
7762 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7765 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7769 if (var
->type
->is_unsized_array()) {
7770 if (var
->data
.max_array_access
>= num_vertices
) {
7771 _mesa_glsl_error(&loc
, state
,
7772 "this geometry shader input layout implies %u"
7773 " vertices, but an access to element %u of input"
7774 " `%s' already exists", num_vertices
,
7775 var
->data
.max_array_access
, var
->name
);
7777 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7788 ast_cs_input_layout::hir(exec_list
*instructions
,
7789 struct _mesa_glsl_parse_state
*state
)
7791 YYLTYPE loc
= this->get_location();
7793 /* From the ARB_compute_shader specification:
7795 * If the local size of the shader in any dimension is greater
7796 * than the maximum size supported by the implementation for that
7797 * dimension, a compile-time error results.
7799 * It is not clear from the spec how the error should be reported if
7800 * the total size of the work group exceeds
7801 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7802 * report it at compile time as well.
7804 GLuint64 total_invocations
= 1;
7805 unsigned qual_local_size
[3];
7806 for (int i
= 0; i
< 3; i
++) {
7808 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7810 /* Infer a local_size of 1 for unspecified dimensions */
7811 if (this->local_size
[i
] == NULL
) {
7812 qual_local_size
[i
] = 1;
7813 } else if (!this->local_size
[i
]->
7814 process_qualifier_constant(state
, local_size_str
,
7815 &qual_local_size
[i
], false)) {
7816 ralloc_free(local_size_str
);
7819 ralloc_free(local_size_str
);
7821 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7822 _mesa_glsl_error(&loc
, state
,
7823 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7825 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7828 total_invocations
*= qual_local_size
[i
];
7829 if (total_invocations
>
7830 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7831 _mesa_glsl_error(&loc
, state
,
7832 "product of local_sizes exceeds "
7833 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7834 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7839 /* If any compute input layout declaration preceded this one, make sure it
7840 * was consistent with this one.
7842 if (state
->cs_input_local_size_specified
) {
7843 for (int i
= 0; i
< 3; i
++) {
7844 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7845 _mesa_glsl_error(&loc
, state
,
7846 "compute shader input layout does not match"
7847 " previous declaration");
7853 state
->cs_input_local_size_specified
= true;
7854 for (int i
= 0; i
< 3; i
++)
7855 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7857 /* We may now declare the built-in constant gl_WorkGroupSize (see
7858 * builtin_variable_generator::generate_constants() for why we didn't
7859 * declare it earlier).
7861 ir_variable
*var
= new(state
->symbols
)
7862 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7863 var
->data
.how_declared
= ir_var_declared_implicitly
;
7864 var
->data
.read_only
= true;
7865 instructions
->push_tail(var
);
7866 state
->symbols
->add_variable(var
);
7867 ir_constant_data data
;
7868 memset(&data
, 0, sizeof(data
));
7869 for (int i
= 0; i
< 3; i
++)
7870 data
.u
[i
] = qual_local_size
[i
];
7871 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7872 var
->constant_initializer
=
7873 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7874 var
->data
.has_initializer
= true;
7881 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7882 exec_list
*instructions
)
7884 bool gl_FragColor_assigned
= false;
7885 bool gl_FragData_assigned
= false;
7886 bool gl_FragSecondaryColor_assigned
= false;
7887 bool gl_FragSecondaryData_assigned
= false;
7888 bool user_defined_fs_output_assigned
= false;
7889 ir_variable
*user_defined_fs_output
= NULL
;
7891 /* It would be nice to have proper location information. */
7893 memset(&loc
, 0, sizeof(loc
));
7895 foreach_in_list(ir_instruction
, node
, instructions
) {
7896 ir_variable
*var
= node
->as_variable();
7898 if (!var
|| !var
->data
.assigned
)
7901 if (strcmp(var
->name
, "gl_FragColor") == 0)
7902 gl_FragColor_assigned
= true;
7903 else if (strcmp(var
->name
, "gl_FragData") == 0)
7904 gl_FragData_assigned
= true;
7905 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7906 gl_FragSecondaryColor_assigned
= true;
7907 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7908 gl_FragSecondaryData_assigned
= true;
7909 else if (!is_gl_identifier(var
->name
)) {
7910 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7911 var
->data
.mode
== ir_var_shader_out
) {
7912 user_defined_fs_output_assigned
= true;
7913 user_defined_fs_output
= var
;
7918 /* From the GLSL 1.30 spec:
7920 * "If a shader statically assigns a value to gl_FragColor, it
7921 * may not assign a value to any element of gl_FragData. If a
7922 * shader statically writes a value to any element of
7923 * gl_FragData, it may not assign a value to
7924 * gl_FragColor. That is, a shader may assign values to either
7925 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7926 * linked together must also consistently write just one of
7927 * these variables. Similarly, if user declared output
7928 * variables are in use (statically assigned to), then the
7929 * built-in variables gl_FragColor and gl_FragData may not be
7930 * assigned to. These incorrect usages all generate compile
7933 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7934 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7935 "`gl_FragColor' and `gl_FragData'");
7936 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7937 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7938 "`gl_FragColor' and `%s'",
7939 user_defined_fs_output
->name
);
7940 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7941 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7942 "`gl_FragSecondaryColorEXT' and"
7943 " `gl_FragSecondaryDataEXT'");
7944 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7945 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7946 "`gl_FragColor' and"
7947 " `gl_FragSecondaryDataEXT'");
7948 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7949 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7951 " `gl_FragSecondaryColorEXT'");
7952 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7953 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7954 "`gl_FragData' and `%s'",
7955 user_defined_fs_output
->name
);
7958 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7959 !state
->EXT_blend_func_extended_enable
) {
7960 _mesa_glsl_error(&loc
, state
,
7961 "Dual source blending requires EXT_blend_func_extended");
7967 remove_per_vertex_blocks(exec_list
*instructions
,
7968 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7970 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7971 * if it exists in this shader type.
7973 const glsl_type
*per_vertex
= NULL
;
7975 case ir_var_shader_in
:
7976 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7977 per_vertex
= gl_in
->get_interface_type();
7979 case ir_var_shader_out
:
7980 if (ir_variable
*gl_Position
=
7981 state
->symbols
->get_variable("gl_Position")) {
7982 per_vertex
= gl_Position
->get_interface_type();
7986 assert(!"Unexpected mode");
7990 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7991 * need to do anything.
7993 if (per_vertex
== NULL
)
7996 /* If the interface block is used by the shader, then we don't need to do
7999 interface_block_usage_visitor
v(mode
, per_vertex
);
8000 v
.run(instructions
);
8001 if (v
.usage_found())
8004 /* Remove any ir_variable declarations that refer to the interface block
8007 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8008 ir_variable
*const var
= node
->as_variable();
8009 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8010 var
->data
.mode
== mode
) {
8011 state
->symbols
->disable_variable(var
->name
);