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 /* the identifier might be a subroutine name */
1923 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
1924 var
= state
->symbols
->get_variable(sub_name
);
1925 ralloc_free(sub_name
);
1929 var
->data
.used
= true;
1930 result
= new(ctx
) ir_dereference_variable(var
);
1932 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
1934 && result
->variable_referenced()->data
.assigned
!= true
1935 && !is_gl_identifier(var
->name
)) {
1936 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
1937 this->primary_expression
.identifier
);
1940 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1941 this->primary_expression
.identifier
);
1943 result
= ir_rvalue::error_value(ctx
);
1944 error_emitted
= true;
1949 case ast_int_constant
:
1950 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1953 case ast_uint_constant
:
1954 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1957 case ast_float_constant
:
1958 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1961 case ast_bool_constant
:
1962 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1965 case ast_double_constant
:
1966 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1969 case ast_sequence
: {
1970 /* It should not be possible to generate a sequence in the AST without
1971 * any expressions in it.
1973 assert(!this->expressions
.is_empty());
1975 /* The r-value of a sequence is the last expression in the sequence. If
1976 * the other expressions in the sequence do not have side-effects (and
1977 * therefore add instructions to the instruction list), they get dropped
1980 exec_node
*previous_tail_pred
= NULL
;
1981 YYLTYPE previous_operand_loc
= loc
;
1983 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1984 /* If one of the operands of comma operator does not generate any
1985 * code, we want to emit a warning. At each pass through the loop
1986 * previous_tail_pred will point to the last instruction in the
1987 * stream *before* processing the previous operand. Naturally,
1988 * instructions->tail_pred will point to the last instruction in the
1989 * stream *after* processing the previous operand. If the two
1990 * pointers match, then the previous operand had no effect.
1992 * The warning behavior here differs slightly from GCC. GCC will
1993 * only emit a warning if none of the left-hand operands have an
1994 * effect. However, it will emit a warning for each. I believe that
1995 * there are some cases in C (especially with GCC extensions) where
1996 * it is useful to have an intermediate step in a sequence have no
1997 * effect, but I don't think these cases exist in GLSL. Either way,
1998 * it would be a giant hassle to replicate that behavior.
2000 if (previous_tail_pred
== instructions
->tail_pred
) {
2001 _mesa_glsl_warning(&previous_operand_loc
, state
,
2002 "left-hand operand of comma expression has "
2006 /* tail_pred is directly accessed instead of using the get_tail()
2007 * method for performance reasons. get_tail() has extra code to
2008 * return NULL when the list is empty. We don't care about that
2009 * here, so using tail_pred directly is fine.
2011 previous_tail_pred
= instructions
->tail_pred
;
2012 previous_operand_loc
= ast
->get_location();
2014 result
= ast
->hir(instructions
, state
);
2017 /* Any errors should have already been emitted in the loop above.
2019 error_emitted
= true;
2023 type
= NULL
; /* use result->type, not type. */
2024 assert(result
!= NULL
|| !needs_rvalue
);
2026 if (result
&& result
->type
->is_error() && !error_emitted
)
2027 _mesa_glsl_error(& loc
, state
, "type mismatch");
2033 ast_expression::has_sequence_subexpression() const
2035 switch (this->oper
) {
2044 return this->subexpressions
[0]->has_sequence_subexpression();
2066 case ast_array_index
:
2067 case ast_mul_assign
:
2068 case ast_div_assign
:
2069 case ast_add_assign
:
2070 case ast_sub_assign
:
2071 case ast_mod_assign
:
2074 case ast_and_assign
:
2075 case ast_xor_assign
:
2077 return this->subexpressions
[0]->has_sequence_subexpression() ||
2078 this->subexpressions
[1]->has_sequence_subexpression();
2080 case ast_conditional
:
2081 return this->subexpressions
[0]->has_sequence_subexpression() ||
2082 this->subexpressions
[1]->has_sequence_subexpression() ||
2083 this->subexpressions
[2]->has_sequence_subexpression();
2088 case ast_field_selection
:
2089 case ast_identifier
:
2090 case ast_int_constant
:
2091 case ast_uint_constant
:
2092 case ast_float_constant
:
2093 case ast_bool_constant
:
2094 case ast_double_constant
:
2098 unreachable("ast_aggregate: Should never get here.");
2100 case ast_function_call
:
2101 unreachable("should be handled by ast_function_expression::hir");
2103 case ast_unsized_array_dim
:
2104 unreachable("ast_unsized_array_dim: Should never get here.");
2111 ast_expression_statement::hir(exec_list
*instructions
,
2112 struct _mesa_glsl_parse_state
*state
)
2114 /* It is possible to have expression statements that don't have an
2115 * expression. This is the solitary semicolon:
2117 * for (i = 0; i < 5; i++)
2120 * In this case the expression will be NULL. Test for NULL and don't do
2121 * anything in that case.
2123 if (expression
!= NULL
)
2124 expression
->hir_no_rvalue(instructions
, state
);
2126 /* Statements do not have r-values.
2133 ast_compound_statement::hir(exec_list
*instructions
,
2134 struct _mesa_glsl_parse_state
*state
)
2137 state
->symbols
->push_scope();
2139 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2140 ast
->hir(instructions
, state
);
2143 state
->symbols
->pop_scope();
2145 /* Compound statements do not have r-values.
2151 * Evaluate the given exec_node (which should be an ast_node representing
2152 * a single array dimension) and return its integer value.
2155 process_array_size(exec_node
*node
,
2156 struct _mesa_glsl_parse_state
*state
)
2158 exec_list dummy_instructions
;
2160 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2163 * Dimensions other than the outermost dimension can by unsized if they
2164 * are immediately sized by a constructor or initializer.
2166 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2169 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2170 YYLTYPE loc
= array_size
->get_location();
2173 _mesa_glsl_error(& loc
, state
,
2174 "array size could not be resolved");
2178 if (!ir
->type
->is_integer()) {
2179 _mesa_glsl_error(& loc
, state
,
2180 "array size must be integer type");
2184 if (!ir
->type
->is_scalar()) {
2185 _mesa_glsl_error(& loc
, state
,
2186 "array size must be scalar type");
2190 ir_constant
*const size
= ir
->constant_expression_value();
2192 (state
->is_version(120, 300) &&
2193 array_size
->has_sequence_subexpression())) {
2194 _mesa_glsl_error(& loc
, state
, "array size must be a "
2195 "constant valued expression");
2199 if (size
->value
.i
[0] <= 0) {
2200 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2204 assert(size
->type
== ir
->type
);
2206 /* If the array size is const (and we've verified that
2207 * it is) then no instructions should have been emitted
2208 * when we converted it to HIR. If they were emitted,
2209 * then either the array size isn't const after all, or
2210 * we are emitting unnecessary instructions.
2212 assert(dummy_instructions
.is_empty());
2214 return size
->value
.u
[0];
2217 static const glsl_type
*
2218 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2219 ast_array_specifier
*array_specifier
,
2220 struct _mesa_glsl_parse_state
*state
)
2222 const glsl_type
*array_type
= base
;
2224 if (array_specifier
!= NULL
) {
2225 if (base
->is_array()) {
2227 /* From page 19 (page 25) of the GLSL 1.20 spec:
2229 * "Only one-dimensional arrays may be declared."
2231 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2232 return glsl_type::error_type
;
2236 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2237 !node
->is_head_sentinel(); node
= node
->prev
) {
2238 unsigned array_size
= process_array_size(node
, state
);
2239 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2247 precision_qualifier_allowed(const glsl_type
*type
)
2249 /* Precision qualifiers apply to floating point, integer and opaque
2252 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2253 * "Any floating point or any integer declaration can have the type
2254 * preceded by one of these precision qualifiers [...] Literal
2255 * constants do not have precision qualifiers. Neither do Boolean
2258 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2261 * "Precision qualifiers are added for code portability with OpenGL
2262 * ES, not for functionality. They have the same syntax as in OpenGL
2265 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2267 * "uniform lowp sampler2D sampler;
2270 * lowp vec4 col = texture2D (sampler, coord);
2271 * // texture2D returns lowp"
2273 * From this, we infer that GLSL 1.30 (and later) should allow precision
2274 * qualifiers on sampler types just like float and integer types.
2276 return (type
->is_float()
2277 || type
->is_integer()
2278 || type
->contains_opaque())
2279 && !type
->without_array()->is_record();
2283 ast_type_specifier::glsl_type(const char **name
,
2284 struct _mesa_glsl_parse_state
*state
) const
2286 const struct glsl_type
*type
;
2288 type
= state
->symbols
->get_type(this->type_name
);
2289 *name
= this->type_name
;
2291 YYLTYPE loc
= this->get_location();
2292 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2298 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2300 * "The precision statement
2302 * precision precision-qualifier type;
2304 * can be used to establish a default precision qualifier. The type field can
2305 * be either int or float or any of the sampler types, (...) If type is float,
2306 * the directive applies to non-precision-qualified floating point type
2307 * (scalar, vector, and matrix) declarations. If type is int, the directive
2308 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2309 * and unsigned) declarations."
2311 * We use the symbol table to keep the values of the default precisions for
2312 * each 'type' in each scope and we use the 'type' string from the precision
2313 * statement as key in the symbol table. When we want to retrieve the default
2314 * precision associated with a given glsl_type we need to know the type string
2315 * associated with it. This is what this function returns.
2318 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2320 switch (type
->base_type
) {
2321 case GLSL_TYPE_FLOAT
:
2323 case GLSL_TYPE_UINT
:
2326 case GLSL_TYPE_ATOMIC_UINT
:
2327 return "atomic_uint";
2328 case GLSL_TYPE_IMAGE
:
2330 case GLSL_TYPE_SAMPLER
: {
2331 const unsigned type_idx
=
2332 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2333 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2334 assert(type_idx
< 4);
2335 switch (type
->sampled_type
) {
2336 case GLSL_TYPE_FLOAT
:
2337 switch (type
->sampler_dimensionality
) {
2338 case GLSL_SAMPLER_DIM_1D
: {
2339 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2340 static const char *const names
[4] = {
2341 "sampler1D", "sampler1DArray",
2342 "sampler1DShadow", "sampler1DArrayShadow"
2344 return names
[type_idx
];
2346 case GLSL_SAMPLER_DIM_2D
: {
2347 static const char *const names
[8] = {
2348 "sampler2D", "sampler2DArray",
2349 "sampler2DShadow", "sampler2DArrayShadow",
2350 "image2D", "image2DArray", NULL
, NULL
2352 return names
[offset
+ type_idx
];
2354 case GLSL_SAMPLER_DIM_3D
: {
2355 static const char *const names
[8] = {
2356 "sampler3D", NULL
, NULL
, NULL
,
2357 "image3D", NULL
, NULL
, NULL
2359 return names
[offset
+ type_idx
];
2361 case GLSL_SAMPLER_DIM_CUBE
: {
2362 static const char *const names
[8] = {
2363 "samplerCube", "samplerCubeArray",
2364 "samplerCubeShadow", "samplerCubeArrayShadow",
2365 "imageCube", NULL
, NULL
, NULL
2367 return names
[offset
+ type_idx
];
2369 case GLSL_SAMPLER_DIM_MS
: {
2370 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2371 static const char *const names
[4] = {
2372 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2374 return names
[type_idx
];
2376 case GLSL_SAMPLER_DIM_RECT
: {
2377 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2378 static const char *const names
[4] = {
2379 "samplerRect", NULL
, "samplerRectShadow", NULL
2381 return names
[type_idx
];
2383 case GLSL_SAMPLER_DIM_BUF
: {
2384 static const char *const names
[8] = {
2385 "samplerBuffer", NULL
, NULL
, NULL
,
2386 "imageBuffer", NULL
, NULL
, NULL
2388 return names
[offset
+ type_idx
];
2390 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2391 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2392 static const char *const names
[4] = {
2393 "samplerExternalOES", NULL
, NULL
, NULL
2395 return names
[type_idx
];
2398 unreachable("Unsupported sampler/image dimensionality");
2399 } /* sampler/image float dimensionality */
2402 switch (type
->sampler_dimensionality
) {
2403 case GLSL_SAMPLER_DIM_1D
: {
2404 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2405 static const char *const names
[4] = {
2406 "isampler1D", "isampler1DArray", NULL
, NULL
2408 return names
[type_idx
];
2410 case GLSL_SAMPLER_DIM_2D
: {
2411 static const char *const names
[8] = {
2412 "isampler2D", "isampler2DArray", NULL
, NULL
,
2413 "iimage2D", "iimage2DArray", NULL
, NULL
2415 return names
[offset
+ type_idx
];
2417 case GLSL_SAMPLER_DIM_3D
: {
2418 static const char *const names
[8] = {
2419 "isampler3D", NULL
, NULL
, NULL
,
2420 "iimage3D", NULL
, NULL
, NULL
2422 return names
[offset
+ type_idx
];
2424 case GLSL_SAMPLER_DIM_CUBE
: {
2425 static const char *const names
[8] = {
2426 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2427 "iimageCube", NULL
, NULL
, NULL
2429 return names
[offset
+ type_idx
];
2431 case GLSL_SAMPLER_DIM_MS
: {
2432 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2433 static const char *const names
[4] = {
2434 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2436 return names
[type_idx
];
2438 case GLSL_SAMPLER_DIM_RECT
: {
2439 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2440 static const char *const names
[4] = {
2441 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2443 return names
[type_idx
];
2445 case GLSL_SAMPLER_DIM_BUF
: {
2446 static const char *const names
[8] = {
2447 "isamplerBuffer", NULL
, NULL
, NULL
,
2448 "iimageBuffer", NULL
, NULL
, NULL
2450 return names
[offset
+ type_idx
];
2453 unreachable("Unsupported isampler/iimage dimensionality");
2454 } /* sampler/image int dimensionality */
2456 case GLSL_TYPE_UINT
:
2457 switch (type
->sampler_dimensionality
) {
2458 case GLSL_SAMPLER_DIM_1D
: {
2459 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2460 static const char *const names
[4] = {
2461 "usampler1D", "usampler1DArray", NULL
, NULL
2463 return names
[type_idx
];
2465 case GLSL_SAMPLER_DIM_2D
: {
2466 static const char *const names
[8] = {
2467 "usampler2D", "usampler2DArray", NULL
, NULL
,
2468 "uimage2D", "uimage2DArray", NULL
, NULL
2470 return names
[offset
+ type_idx
];
2472 case GLSL_SAMPLER_DIM_3D
: {
2473 static const char *const names
[8] = {
2474 "usampler3D", NULL
, NULL
, NULL
,
2475 "uimage3D", NULL
, NULL
, NULL
2477 return names
[offset
+ type_idx
];
2479 case GLSL_SAMPLER_DIM_CUBE
: {
2480 static const char *const names
[8] = {
2481 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2482 "uimageCube", NULL
, NULL
, NULL
2484 return names
[offset
+ type_idx
];
2486 case GLSL_SAMPLER_DIM_MS
: {
2487 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2488 static const char *const names
[4] = {
2489 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2491 return names
[type_idx
];
2493 case GLSL_SAMPLER_DIM_RECT
: {
2494 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2495 static const char *const names
[4] = {
2496 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2498 return names
[type_idx
];
2500 case GLSL_SAMPLER_DIM_BUF
: {
2501 static const char *const names
[8] = {
2502 "usamplerBuffer", NULL
, NULL
, NULL
,
2503 "uimageBuffer", NULL
, NULL
, NULL
2505 return names
[offset
+ type_idx
];
2508 unreachable("Unsupported usampler/uimage dimensionality");
2509 } /* sampler/image uint dimensionality */
2512 unreachable("Unsupported sampler/image type");
2513 } /* sampler/image type */
2515 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2518 unreachable("Unsupported type");
2523 select_gles_precision(unsigned qual_precision
,
2524 const glsl_type
*type
,
2525 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2527 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2528 * In GLES we take the precision from the type qualifier if present,
2529 * otherwise, if the type of the variable allows precision qualifiers at
2530 * all, we look for the default precision qualifier for that type in the
2533 assert(state
->es_shader
);
2535 unsigned precision
= GLSL_PRECISION_NONE
;
2536 if (qual_precision
) {
2537 precision
= qual_precision
;
2538 } else if (precision_qualifier_allowed(type
)) {
2539 const char *type_name
=
2540 get_type_name_for_precision_qualifier(type
->without_array());
2541 assert(type_name
!= NULL
);
2544 state
->symbols
->get_default_precision_qualifier(type_name
);
2545 if (precision
== ast_precision_none
) {
2546 _mesa_glsl_error(loc
, state
,
2547 "No precision specified in this scope for type `%s'",
2555 ast_fully_specified_type::glsl_type(const char **name
,
2556 struct _mesa_glsl_parse_state
*state
) const
2558 return this->specifier
->glsl_type(name
, state
);
2562 * Determine whether a toplevel variable declaration declares a varying. This
2563 * function operates by examining the variable's mode and the shader target,
2564 * so it correctly identifies linkage variables regardless of whether they are
2565 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2567 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2568 * this function will produce undefined results.
2571 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2574 case MESA_SHADER_VERTEX
:
2575 return var
->data
.mode
== ir_var_shader_out
;
2576 case MESA_SHADER_FRAGMENT
:
2577 return var
->data
.mode
== ir_var_shader_in
;
2579 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2585 * Matrix layout qualifiers are only allowed on certain types
2588 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2590 const glsl_type
*type
,
2593 if (var
&& !var
->is_in_buffer_block()) {
2594 /* Layout qualifiers may only apply to interface blocks and fields in
2597 _mesa_glsl_error(loc
, state
,
2598 "uniform block layout qualifiers row_major and "
2599 "column_major may not be applied to variables "
2600 "outside of uniform blocks");
2601 } else if (!type
->without_array()->is_matrix()) {
2602 /* The OpenGL ES 3.0 conformance tests did not originally allow
2603 * matrix layout qualifiers on non-matrices. However, the OpenGL
2604 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2605 * amended to specifically allow these layouts on all types. Emit
2606 * a warning so that people know their code may not be portable.
2608 _mesa_glsl_warning(loc
, state
,
2609 "uniform block layout qualifiers row_major and "
2610 "column_major applied to non-matrix types may "
2611 "be rejected by older compilers");
2616 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2617 struct _mesa_glsl_parse_state
*state
,
2618 unsigned xfb_buffer
) {
2619 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2620 _mesa_glsl_error(loc
, state
,
2621 "invalid xfb_buffer specified %d is larger than "
2622 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2624 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2631 /* From the ARB_enhanced_layouts spec:
2633 * "Variables and block members qualified with *xfb_offset* can be
2634 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2635 * The offset must be a multiple of the size of the first component of
2636 * the first qualified variable or block member, or a compile-time error
2637 * results. Further, if applied to an aggregate containing a double,
2638 * the offset must also be a multiple of 8, and the space taken in the
2639 * buffer will be a multiple of 8.
2642 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2643 struct _mesa_glsl_parse_state
*state
,
2644 int xfb_offset
, const glsl_type
*type
,
2645 unsigned component_size
) {
2646 const glsl_type
*t_without_array
= type
->without_array();
2648 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2649 _mesa_glsl_error(loc
, state
,
2650 "xfb_offset can't be used with unsized arrays.");
2654 /* Make sure nested structs don't contain unsized arrays, and validate
2655 * any xfb_offsets on interface members.
2657 if (t_without_array
->is_record() || t_without_array
->is_interface())
2658 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2659 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2661 /* When the interface block doesn't have an xfb_offset qualifier then
2662 * we apply the component size rules at the member level.
2664 if (xfb_offset
== -1)
2665 component_size
= member_t
->contains_double() ? 8 : 4;
2667 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2668 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2672 /* Nested structs or interface block without offset may not have had an
2673 * offset applied yet so return.
2675 if (xfb_offset
== -1) {
2679 if (xfb_offset
% component_size
) {
2680 _mesa_glsl_error(loc
, state
,
2681 "invalid qualifier xfb_offset=%d must be a multiple "
2682 "of the first component size of the first qualified "
2683 "variable or block member. Or double if an aggregate "
2684 "that contains a double (%d).",
2685 xfb_offset
, component_size
);
2693 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2696 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2697 _mesa_glsl_error(loc
, state
,
2698 "invalid stream specified %d is larger than "
2699 "MAX_VERTEX_STREAMS - 1 (%d).",
2700 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2708 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2711 const glsl_type
*type
,
2712 const ast_type_qualifier
*qual
)
2714 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2715 _mesa_glsl_error(loc
, state
,
2716 "the \"binding\" qualifier only applies to uniforms and "
2717 "shader storage buffer objects");
2721 unsigned qual_binding
;
2722 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2727 const struct gl_context
*const ctx
= state
->ctx
;
2728 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2729 unsigned max_index
= qual_binding
+ elements
- 1;
2730 const glsl_type
*base_type
= type
->without_array();
2732 if (base_type
->is_interface()) {
2733 /* UBOs. From page 60 of the GLSL 4.20 specification:
2734 * "If the binding point for any uniform block instance is less than zero,
2735 * or greater than or equal to the implementation-dependent maximum
2736 * number of uniform buffer bindings, a compilation error will occur.
2737 * When the binding identifier is used with a uniform block instanced as
2738 * an array of size N, all elements of the array from binding through
2739 * binding + N – 1 must be within this range."
2741 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2743 if (qual
->flags
.q
.uniform
&&
2744 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2745 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2746 "the maximum number of UBO binding points (%d)",
2747 qual_binding
, elements
,
2748 ctx
->Const
.MaxUniformBufferBindings
);
2752 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2753 * "If the binding point for any uniform or shader storage block instance
2754 * is less than zero, or greater than or equal to the
2755 * implementation-dependent maximum number of uniform buffer bindings, a
2756 * compile-time error will occur. When the binding identifier is used
2757 * with a uniform or shader storage block instanced as an array of size
2758 * N, all elements of the array from binding through binding + N – 1 must
2759 * be within this range."
2761 if (qual
->flags
.q
.buffer
&&
2762 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2763 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2764 "the maximum number of SSBO binding points (%d)",
2765 qual_binding
, elements
,
2766 ctx
->Const
.MaxShaderStorageBufferBindings
);
2769 } else if (base_type
->is_sampler()) {
2770 /* Samplers. From page 63 of the GLSL 4.20 specification:
2771 * "If the binding is less than zero, or greater than or equal to the
2772 * implementation-dependent maximum supported number of units, a
2773 * compilation error will occur. When the binding identifier is used
2774 * with an array of size N, all elements of the array from binding
2775 * through binding + N - 1 must be within this range."
2777 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2779 if (max_index
>= limit
) {
2780 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2781 "exceeds the maximum number of texture image units "
2782 "(%u)", qual_binding
, elements
, limit
);
2786 } else if (base_type
->contains_atomic()) {
2787 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2788 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2789 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2790 " maximum number of atomic counter buffer bindings"
2791 "(%u)", qual_binding
,
2792 ctx
->Const
.MaxAtomicBufferBindings
);
2796 } else if ((state
->is_version(420, 310) ||
2797 state
->ARB_shading_language_420pack_enable
) &&
2798 base_type
->is_image()) {
2799 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2800 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2801 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2802 " maximum number of image units (%d)", max_index
,
2803 ctx
->Const
.MaxImageUnits
);
2808 _mesa_glsl_error(loc
, state
,
2809 "the \"binding\" qualifier only applies to uniform "
2810 "blocks, opaque variables, or arrays thereof");
2814 var
->data
.explicit_binding
= true;
2815 var
->data
.binding
= qual_binding
;
2822 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
2824 const glsl_interp_qualifier interpolation
,
2825 const struct ast_type_qualifier
*qual
,
2826 const struct glsl_type
*var_type
,
2827 ir_variable_mode mode
)
2829 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
2830 * not to vertex shader inputs nor fragment shader outputs.
2832 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2833 * "Outputs from a vertex shader (out) and inputs to a fragment
2834 * shader (in) can be further qualified with one or more of these
2835 * interpolation qualifiers"
2837 * "These interpolation qualifiers may only precede the qualifiers in,
2838 * centroid in, out, or centroid out in a declaration. They do not apply
2839 * to the deprecated storage qualifiers varying or centroid
2840 * varying. They also do not apply to inputs into a vertex shader or
2841 * outputs from a fragment shader."
2843 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
2844 * "Outputs from a shader (out) and inputs to a shader (in) can be
2845 * further qualified with one of these interpolation qualifiers."
2847 * "These interpolation qualifiers may only precede the qualifiers
2848 * in, centroid in, out, or centroid out in a declaration. They do
2849 * not apply to inputs into a vertex shader or outputs from a
2852 if (state
->is_version(130, 300)
2853 && interpolation
!= INTERP_QUALIFIER_NONE
) {
2854 const char *i
= interpolation_string(interpolation
);
2855 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
2856 _mesa_glsl_error(loc
, state
,
2857 "interpolation qualifier `%s' can only be applied to "
2858 "shader inputs or outputs.", i
);
2860 switch (state
->stage
) {
2861 case MESA_SHADER_VERTEX
:
2862 if (mode
== ir_var_shader_in
) {
2863 _mesa_glsl_error(loc
, state
,
2864 "interpolation qualifier '%s' cannot be applied to "
2865 "vertex shader inputs", i
);
2868 case MESA_SHADER_FRAGMENT
:
2869 if (mode
== ir_var_shader_out
) {
2870 _mesa_glsl_error(loc
, state
,
2871 "interpolation qualifier '%s' cannot be applied to "
2872 "fragment shader outputs", i
);
2880 /* Interpolation qualifiers cannot be applied to 'centroid' and
2881 * 'centroid varying'.
2883 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2884 * "interpolation qualifiers may only precede the qualifiers in,
2885 * centroid in, out, or centroid out in a declaration. They do not apply
2886 * to the deprecated storage qualifiers varying or centroid varying."
2888 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2890 if (state
->is_version(130, 0)
2891 && interpolation
!= INTERP_QUALIFIER_NONE
2892 && qual
->flags
.q
.varying
) {
2894 const char *i
= interpolation_string(interpolation
);
2896 if (qual
->flags
.q
.centroid
)
2897 s
= "centroid varying";
2901 _mesa_glsl_error(loc
, state
,
2902 "qualifier '%s' cannot be applied to the "
2903 "deprecated storage qualifier '%s'", i
, s
);
2906 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2907 * so must integer vertex outputs.
2909 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2910 * "Fragment shader inputs that are signed or unsigned integers or
2911 * integer vectors must be qualified with the interpolation qualifier
2914 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2915 * "Fragment shader inputs that are, or contain, signed or unsigned
2916 * integers or integer vectors must be qualified with the
2917 * interpolation qualifier flat."
2919 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2920 * "Vertex shader outputs that are, or contain, signed or unsigned
2921 * integers or integer vectors must be qualified with the
2922 * interpolation qualifier flat."
2924 * Note that prior to GLSL 1.50, this requirement applied to vertex
2925 * outputs rather than fragment inputs. That creates problems in the
2926 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2927 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2928 * apply the restriction to both vertex outputs and fragment inputs.
2930 * Note also that the desktop GLSL specs are missing the text "or
2931 * contain"; this is presumably an oversight, since there is no
2932 * reasonable way to interpolate a fragment shader input that contains
2933 * an integer. See Khronos bug #15671.
2935 if (state
->is_version(130, 300)
2936 && var_type
->contains_integer()
2937 && interpolation
!= INTERP_QUALIFIER_FLAT
2938 && ((state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_in
)
2939 || (state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_out
2940 && state
->es_shader
))) {
2941 const char *shader_var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
2942 "vertex output" : "fragment input";
2943 _mesa_glsl_error(loc
, state
, "if a %s is (or contains) "
2944 "an integer, then it must be qualified with 'flat'",
2948 /* Double fragment inputs must be qualified with 'flat'.
2950 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
2951 * "This extension does not support interpolation of double-precision
2952 * values; doubles used as fragment shader inputs must be qualified as
2955 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
2956 * "Fragment shader inputs that are signed or unsigned integers, integer
2957 * vectors, or any double-precision floating-point type must be
2958 * qualified with the interpolation qualifier flat."
2960 * Note that the GLSL specs are missing the text "or contain"; this is
2961 * presumably an oversight. See Khronos bug #15671.
2963 * The 'double' type does not exist in GLSL ES so far.
2965 if ((state
->ARB_gpu_shader_fp64_enable
2966 || state
->is_version(400, 0))
2967 && var_type
->contains_double()
2968 && interpolation
!= INTERP_QUALIFIER_FLAT
2969 && state
->stage
== MESA_SHADER_FRAGMENT
2970 && mode
== ir_var_shader_in
) {
2971 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
2972 "a double, then it must be qualified with 'flat'");
2976 static glsl_interp_qualifier
2977 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2978 const struct glsl_type
*var_type
,
2979 ir_variable_mode mode
,
2980 struct _mesa_glsl_parse_state
*state
,
2983 glsl_interp_qualifier interpolation
;
2984 if (qual
->flags
.q
.flat
)
2985 interpolation
= INTERP_QUALIFIER_FLAT
;
2986 else if (qual
->flags
.q
.noperspective
)
2987 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2988 else if (qual
->flags
.q
.smooth
)
2989 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2990 else if (state
->es_shader
&&
2991 ((mode
== ir_var_shader_in
&&
2992 state
->stage
!= MESA_SHADER_VERTEX
) ||
2993 (mode
== ir_var_shader_out
&&
2994 state
->stage
!= MESA_SHADER_FRAGMENT
)))
2995 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
2997 * "When no interpolation qualifier is present, smooth interpolation
3000 interpolation
= INTERP_QUALIFIER_SMOOTH
;
3002 interpolation
= INTERP_QUALIFIER_NONE
;
3004 validate_interpolation_qualifier(state
, loc
,
3006 qual
, var_type
, mode
);
3008 return interpolation
;
3013 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3015 struct _mesa_glsl_parse_state
*state
,
3020 unsigned qual_location
;
3021 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3026 /* Checks for GL_ARB_explicit_uniform_location. */
3027 if (qual
->flags
.q
.uniform
) {
3028 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3031 const struct gl_context
*const ctx
= state
->ctx
;
3032 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3034 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3035 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3036 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3037 ctx
->Const
.MaxUserAssignableUniformLocations
);
3041 var
->data
.explicit_location
= true;
3042 var
->data
.location
= qual_location
;
3046 /* Between GL_ARB_explicit_attrib_location an
3047 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3048 * stage can be assigned explicit locations. The checking here associates
3049 * the correct extension with the correct stage's input / output:
3053 * vertex explicit_loc sso
3054 * tess control sso sso
3057 * fragment sso explicit_loc
3059 switch (state
->stage
) {
3060 case MESA_SHADER_VERTEX
:
3061 if (var
->data
.mode
== ir_var_shader_in
) {
3062 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3068 if (var
->data
.mode
== ir_var_shader_out
) {
3069 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3078 case MESA_SHADER_TESS_CTRL
:
3079 case MESA_SHADER_TESS_EVAL
:
3080 case MESA_SHADER_GEOMETRY
:
3081 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3082 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3091 case MESA_SHADER_FRAGMENT
:
3092 if (var
->data
.mode
== ir_var_shader_in
) {
3093 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3099 if (var
->data
.mode
== ir_var_shader_out
) {
3100 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3109 case MESA_SHADER_COMPUTE
:
3110 _mesa_glsl_error(loc
, state
,
3111 "compute shader variables cannot be given "
3112 "explicit locations");
3117 _mesa_glsl_error(loc
, state
,
3118 "%s cannot be given an explicit location in %s shader",
3120 _mesa_shader_stage_to_string(state
->stage
));
3122 var
->data
.explicit_location
= true;
3124 switch (state
->stage
) {
3125 case MESA_SHADER_VERTEX
:
3126 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3127 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3128 : (qual_location
+ VARYING_SLOT_VAR0
);
3131 case MESA_SHADER_TESS_CTRL
:
3132 case MESA_SHADER_TESS_EVAL
:
3133 case MESA_SHADER_GEOMETRY
:
3134 if (var
->data
.patch
)
3135 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3137 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3140 case MESA_SHADER_FRAGMENT
:
3141 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3142 ? (qual_location
+ FRAG_RESULT_DATA0
)
3143 : (qual_location
+ VARYING_SLOT_VAR0
);
3145 case MESA_SHADER_COMPUTE
:
3146 assert(!"Unexpected shader type");
3150 /* Check if index was set for the uniform instead of the function */
3151 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
3152 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3153 "used with subroutine functions");
3157 unsigned qual_index
;
3158 if (qual
->flags
.q
.explicit_index
&&
3159 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3161 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3162 * Layout Qualifiers):
3164 * "It is also a compile-time error if a fragment shader
3165 * sets a layout index to less than 0 or greater than 1."
3167 * Older specifications don't mandate a behavior; we take
3168 * this as a clarification and always generate the error.
3170 if (qual_index
> 1) {
3171 _mesa_glsl_error(loc
, state
,
3172 "explicit index may only be 0 or 1");
3174 var
->data
.explicit_index
= true;
3175 var
->data
.index
= qual_index
;
3182 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3184 struct _mesa_glsl_parse_state
*state
,
3187 const glsl_type
*base_type
= var
->type
->without_array();
3189 if (base_type
->is_image()) {
3190 if (var
->data
.mode
!= ir_var_uniform
&&
3191 var
->data
.mode
!= ir_var_function_in
) {
3192 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3193 "function parameters or uniform-qualified "
3194 "global variables");
3197 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
3198 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
3199 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
3200 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
3201 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
3202 var
->data
.read_only
= true;
3204 if (qual
->flags
.q
.explicit_image_format
) {
3205 if (var
->data
.mode
== ir_var_function_in
) {
3206 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
3207 "used on image function parameters");
3210 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3211 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
3212 "base data type of the image");
3215 var
->data
.image_format
= qual
->image_format
;
3217 if (var
->data
.mode
== ir_var_uniform
) {
3218 if (state
->es_shader
) {
3219 _mesa_glsl_error(loc
, state
, "all image uniforms "
3220 "must have a format layout qualifier");
3222 } else if (!qual
->flags
.q
.write_only
) {
3223 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3224 "`writeonly' must have a format layout "
3229 var
->data
.image_format
= GL_NONE
;
3232 /* From page 70 of the GLSL ES 3.1 specification:
3234 * "Except for image variables qualified with the format qualifiers
3235 * r32f, r32i, and r32ui, image variables must specify either memory
3236 * qualifier readonly or the memory qualifier writeonly."
3238 if (state
->es_shader
&&
3239 var
->data
.image_format
!= GL_R32F
&&
3240 var
->data
.image_format
!= GL_R32I
&&
3241 var
->data
.image_format
!= GL_R32UI
&&
3242 !var
->data
.image_read_only
&&
3243 !var
->data
.image_write_only
) {
3244 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3245 "r32f, r32i or r32ui must be qualified `readonly' or "
3249 } else if (qual
->flags
.q
.read_only
||
3250 qual
->flags
.q
.write_only
||
3251 qual
->flags
.q
.coherent
||
3252 qual
->flags
.q
._volatile
||
3253 qual
->flags
.q
.restrict_flag
||
3254 qual
->flags
.q
.explicit_image_format
) {
3255 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3260 static inline const char*
3261 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3263 if (origin_upper_left
&& pixel_center_integer
)
3264 return "origin_upper_left, pixel_center_integer";
3265 else if (origin_upper_left
)
3266 return "origin_upper_left";
3267 else if (pixel_center_integer
)
3268 return "pixel_center_integer";
3274 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3275 const struct ast_type_qualifier
*qual
)
3277 /* If gl_FragCoord was previously declared, and the qualifiers were
3278 * different in any way, return true.
3280 if (state
->fs_redeclares_gl_fragcoord
) {
3281 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3282 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3289 validate_array_dimensions(const glsl_type
*t
,
3290 struct _mesa_glsl_parse_state
*state
,
3292 if (t
->is_array()) {
3293 t
= t
->fields
.array
;
3294 while (t
->is_array()) {
3295 if (t
->is_unsized_array()) {
3296 _mesa_glsl_error(loc
, state
,
3297 "only the outermost array dimension can "
3302 t
= t
->fields
.array
;
3308 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3310 struct _mesa_glsl_parse_state
*state
,
3313 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3315 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3317 * "Within any shader, the first redeclarations of gl_FragCoord
3318 * must appear before any use of gl_FragCoord."
3320 * Generate a compiler error if above condition is not met by the
3323 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3324 if (earlier
!= NULL
&&
3325 earlier
->data
.used
&&
3326 !state
->fs_redeclares_gl_fragcoord
) {
3327 _mesa_glsl_error(loc
, state
,
3328 "gl_FragCoord used before its first redeclaration "
3329 "in fragment shader");
3332 /* Make sure all gl_FragCoord redeclarations specify the same layout
3335 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3336 const char *const qual_string
=
3337 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3338 qual
->flags
.q
.pixel_center_integer
);
3340 const char *const state_string
=
3341 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3342 state
->fs_pixel_center_integer
);
3344 _mesa_glsl_error(loc
, state
,
3345 "gl_FragCoord redeclared with different layout "
3346 "qualifiers (%s) and (%s) ",
3350 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3351 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3352 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3353 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3354 state
->fs_redeclares_gl_fragcoord
=
3355 state
->fs_origin_upper_left
||
3356 state
->fs_pixel_center_integer
||
3357 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3360 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3361 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3362 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3363 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3364 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3365 ? "origin_upper_left" : "pixel_center_integer";
3367 _mesa_glsl_error(loc
, state
,
3368 "layout qualifier `%s' can only be applied to "
3369 "fragment shader input `gl_FragCoord'",
3373 if (qual
->flags
.q
.explicit_location
) {
3374 apply_explicit_location(qual
, var
, state
, loc
);
3376 if (qual
->flags
.q
.explicit_component
) {
3377 unsigned qual_component
;
3378 if (process_qualifier_constant(state
, loc
, "component",
3379 qual
->component
, &qual_component
)) {
3380 const glsl_type
*type
= var
->type
->without_array();
3381 unsigned components
= type
->component_slots();
3383 if (type
->is_matrix() || type
->is_record()) {
3384 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3385 "cannot be applied to a matrix, a structure, "
3386 "a block, or an array containing any of "
3388 } else if (qual_component
!= 0 &&
3389 (qual_component
+ components
- 1) > 3) {
3390 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3391 (qual_component
+ components
- 1));
3392 } else if (qual_component
== 1 && type
->is_double()) {
3393 /* We don't bother checking for 3 as it should be caught by the
3394 * overflow check above.
3396 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3397 "component 1 or 3");
3399 var
->data
.explicit_component
= true;
3400 var
->data
.location_frac
= qual_component
;
3404 } else if (qual
->flags
.q
.explicit_index
) {
3405 if (!qual
->flags
.q
.subroutine_def
)
3406 _mesa_glsl_error(loc
, state
,
3407 "explicit index requires explicit location");
3408 } else if (qual
->flags
.q
.explicit_component
) {
3409 _mesa_glsl_error(loc
, state
,
3410 "explicit component requires explicit location");
3413 if (qual
->flags
.q
.explicit_binding
) {
3414 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3417 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3418 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3419 unsigned qual_stream
;
3420 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3422 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3423 var
->data
.stream
= qual_stream
;
3427 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3428 unsigned qual_xfb_buffer
;
3429 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3430 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3431 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3432 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3433 if (qual
->flags
.q
.explicit_xfb_buffer
)
3434 var
->data
.explicit_xfb_buffer
= true;
3438 if (qual
->flags
.q
.explicit_xfb_offset
) {
3439 unsigned qual_xfb_offset
;
3440 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3442 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3443 qual
->offset
, &qual_xfb_offset
) &&
3444 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3445 var
->type
, component_size
)) {
3446 var
->data
.offset
= qual_xfb_offset
;
3447 var
->data
.explicit_xfb_offset
= true;
3451 if (qual
->flags
.q
.explicit_xfb_stride
) {
3452 unsigned qual_xfb_stride
;
3453 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3454 qual
->xfb_stride
, &qual_xfb_stride
)) {
3455 var
->data
.xfb_stride
= qual_xfb_stride
;
3456 var
->data
.explicit_xfb_stride
= true;
3460 if (var
->type
->contains_atomic()) {
3461 if (var
->data
.mode
== ir_var_uniform
) {
3462 if (var
->data
.explicit_binding
) {
3464 &state
->atomic_counter_offsets
[var
->data
.binding
];
3466 if (*offset
% ATOMIC_COUNTER_SIZE
)
3467 _mesa_glsl_error(loc
, state
,
3468 "misaligned atomic counter offset");
3470 var
->data
.offset
= *offset
;
3471 *offset
+= var
->type
->atomic_size();
3474 _mesa_glsl_error(loc
, state
,
3475 "atomic counters require explicit binding point");
3477 } else if (var
->data
.mode
!= ir_var_function_in
) {
3478 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3479 "function parameters or uniform-qualified "
3480 "global variables");
3484 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3485 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3486 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3487 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3488 * These extensions and all following extensions that add the 'layout'
3489 * keyword have been modified to require the use of 'in' or 'out'.
3491 * The following extension do not allow the deprecated keywords:
3493 * GL_AMD_conservative_depth
3494 * GL_ARB_conservative_depth
3495 * GL_ARB_gpu_shader5
3496 * GL_ARB_separate_shader_objects
3497 * GL_ARB_tessellation_shader
3498 * GL_ARB_transform_feedback3
3499 * GL_ARB_uniform_buffer_object
3501 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3502 * allow layout with the deprecated keywords.
3504 const bool relaxed_layout_qualifier_checking
=
3505 state
->ARB_fragment_coord_conventions_enable
;
3507 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3508 || qual
->flags
.q
.varying
;
3509 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3510 if (relaxed_layout_qualifier_checking
) {
3511 _mesa_glsl_warning(loc
, state
,
3512 "`layout' qualifier may not be used with "
3513 "`attribute' or `varying'");
3515 _mesa_glsl_error(loc
, state
,
3516 "`layout' qualifier may not be used with "
3517 "`attribute' or `varying'");
3521 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3522 * AMD_conservative_depth.
3524 int depth_layout_count
= qual
->flags
.q
.depth_any
3525 + qual
->flags
.q
.depth_greater
3526 + qual
->flags
.q
.depth_less
3527 + qual
->flags
.q
.depth_unchanged
;
3528 if (depth_layout_count
> 0
3529 && !state
->is_version(420, 0)
3530 && !state
->AMD_conservative_depth_enable
3531 && !state
->ARB_conservative_depth_enable
) {
3532 _mesa_glsl_error(loc
, state
,
3533 "extension GL_AMD_conservative_depth or "
3534 "GL_ARB_conservative_depth must be enabled "
3535 "to use depth layout qualifiers");
3536 } else if (depth_layout_count
> 0
3537 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3538 _mesa_glsl_error(loc
, state
,
3539 "depth layout qualifiers can be applied only to "
3541 } else if (depth_layout_count
> 1
3542 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3543 _mesa_glsl_error(loc
, state
,
3544 "at most one depth layout qualifier can be applied to "
3547 if (qual
->flags
.q
.depth_any
)
3548 var
->data
.depth_layout
= ir_depth_layout_any
;
3549 else if (qual
->flags
.q
.depth_greater
)
3550 var
->data
.depth_layout
= ir_depth_layout_greater
;
3551 else if (qual
->flags
.q
.depth_less
)
3552 var
->data
.depth_layout
= ir_depth_layout_less
;
3553 else if (qual
->flags
.q
.depth_unchanged
)
3554 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3556 var
->data
.depth_layout
= ir_depth_layout_none
;
3558 if (qual
->flags
.q
.std140
||
3559 qual
->flags
.q
.std430
||
3560 qual
->flags
.q
.packed
||
3561 qual
->flags
.q
.shared
) {
3562 _mesa_glsl_error(loc
, state
,
3563 "uniform and shader storage block layout qualifiers "
3564 "std140, std430, packed, and shared can only be "
3565 "applied to uniform or shader storage blocks, not "
3569 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3570 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3573 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3576 * "Fragment shaders also allow the following layout qualifier on in only
3577 * (not with variable declarations)
3578 * layout-qualifier-id
3579 * early_fragment_tests
3582 if (qual
->flags
.q
.early_fragment_tests
) {
3583 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3584 "valid in fragment shader input layout declaration.");
3589 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3591 struct _mesa_glsl_parse_state
*state
,
3595 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3597 if (qual
->flags
.q
.invariant
) {
3598 if (var
->data
.used
) {
3599 _mesa_glsl_error(loc
, state
,
3600 "variable `%s' may not be redeclared "
3601 "`invariant' after being used",
3604 var
->data
.invariant
= 1;
3608 if (qual
->flags
.q
.precise
) {
3609 if (var
->data
.used
) {
3610 _mesa_glsl_error(loc
, state
,
3611 "variable `%s' may not be redeclared "
3612 "`precise' after being used",
3615 var
->data
.precise
= 1;
3619 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3620 _mesa_glsl_error(loc
, state
,
3621 "`subroutine' may only be applied to uniforms, "
3622 "subroutine type declarations, or function definitions");
3625 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3626 || qual
->flags
.q
.uniform
3627 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3628 var
->data
.read_only
= 1;
3630 if (qual
->flags
.q
.centroid
)
3631 var
->data
.centroid
= 1;
3633 if (qual
->flags
.q
.sample
)
3634 var
->data
.sample
= 1;
3636 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3637 if (state
->es_shader
) {
3638 var
->data
.precision
=
3639 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3642 if (qual
->flags
.q
.patch
)
3643 var
->data
.patch
= 1;
3645 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3646 var
->type
= glsl_type::error_type
;
3647 _mesa_glsl_error(loc
, state
,
3648 "`attribute' variables may not be declared in the "
3650 _mesa_shader_stage_to_string(state
->stage
));
3653 /* Disallow layout qualifiers which may only appear on layout declarations. */
3654 if (qual
->flags
.q
.prim_type
) {
3655 _mesa_glsl_error(loc
, state
,
3656 "Primitive type may only be specified on GS input or output "
3657 "layout declaration, not on variables.");
3660 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3662 * "However, the const qualifier cannot be used with out or inout."
3664 * The same section of the GLSL 4.40 spec further clarifies this saying:
3666 * "The const qualifier cannot be used with out or inout, or a
3667 * compile-time error results."
3669 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3670 _mesa_glsl_error(loc
, state
,
3671 "`const' may not be applied to `out' or `inout' "
3672 "function parameters");
3675 /* If there is no qualifier that changes the mode of the variable, leave
3676 * the setting alone.
3678 assert(var
->data
.mode
!= ir_var_temporary
);
3679 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3680 var
->data
.mode
= ir_var_function_inout
;
3681 else if (qual
->flags
.q
.in
)
3682 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3683 else if (qual
->flags
.q
.attribute
3684 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3685 var
->data
.mode
= ir_var_shader_in
;
3686 else if (qual
->flags
.q
.out
)
3687 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3688 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3689 var
->data
.mode
= ir_var_shader_out
;
3690 else if (qual
->flags
.q
.uniform
)
3691 var
->data
.mode
= ir_var_uniform
;
3692 else if (qual
->flags
.q
.buffer
)
3693 var
->data
.mode
= ir_var_shader_storage
;
3694 else if (qual
->flags
.q
.shared_storage
)
3695 var
->data
.mode
= ir_var_shader_shared
;
3697 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3698 /* User-defined ins/outs are not permitted in compute shaders. */
3699 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3700 _mesa_glsl_error(loc
, state
,
3701 "user-defined input and output variables are not "
3702 "permitted in compute shaders");
3705 /* This variable is being used to link data between shader stages (in
3706 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3707 * that is allowed for such purposes.
3709 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3711 * "The varying qualifier can be used only with the data types
3712 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3715 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3716 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3718 * "Fragment inputs can only be signed and unsigned integers and
3719 * integer vectors, float, floating-point vectors, matrices, or
3720 * arrays of these. Structures cannot be input.
3722 * Similar text exists in the section on vertex shader outputs.
3724 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3725 * 3.00 spec allows structs as well. Varying structs are also allowed
3728 switch (var
->type
->get_scalar_type()->base_type
) {
3729 case GLSL_TYPE_FLOAT
:
3730 /* Ok in all GLSL versions */
3732 case GLSL_TYPE_UINT
:
3734 if (state
->is_version(130, 300))
3736 _mesa_glsl_error(loc
, state
,
3737 "varying variables must be of base type float in %s",
3738 state
->get_version_string());
3740 case GLSL_TYPE_STRUCT
:
3741 if (state
->is_version(150, 300))
3743 _mesa_glsl_error(loc
, state
,
3744 "varying variables may not be of type struct");
3746 case GLSL_TYPE_DOUBLE
:
3749 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3754 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3755 switch (state
->stage
) {
3756 case MESA_SHADER_VERTEX
:
3757 if (var
->data
.mode
== ir_var_shader_out
)
3758 var
->data
.invariant
= true;
3760 case MESA_SHADER_TESS_CTRL
:
3761 case MESA_SHADER_TESS_EVAL
:
3762 case MESA_SHADER_GEOMETRY
:
3763 if ((var
->data
.mode
== ir_var_shader_in
)
3764 || (var
->data
.mode
== ir_var_shader_out
))
3765 var
->data
.invariant
= true;
3767 case MESA_SHADER_FRAGMENT
:
3768 if (var
->data
.mode
== ir_var_shader_in
)
3769 var
->data
.invariant
= true;
3771 case MESA_SHADER_COMPUTE
:
3772 /* Invariance isn't meaningful in compute shaders. */
3777 var
->data
.interpolation
=
3778 interpret_interpolation_qualifier(qual
, var
->type
,
3779 (ir_variable_mode
) var
->data
.mode
,
3782 /* Does the declaration use the deprecated 'attribute' or 'varying'
3785 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3786 || qual
->flags
.q
.varying
;
3789 /* Validate auxiliary storage qualifiers */
3791 /* From section 4.3.4 of the GLSL 1.30 spec:
3792 * "It is an error to use centroid in in a vertex shader."
3794 * From section 4.3.4 of the GLSL ES 3.00 spec:
3795 * "It is an error to use centroid in or interpolation qualifiers in
3796 * a vertex shader input."
3799 /* Section 4.3.6 of the GLSL 1.30 specification states:
3800 * "It is an error to use centroid out in a fragment shader."
3802 * The GL_ARB_shading_language_420pack extension specification states:
3803 * "It is an error to use auxiliary storage qualifiers or interpolation
3804 * qualifiers on an output in a fragment shader."
3806 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3807 _mesa_glsl_error(loc
, state
,
3808 "sample qualifier may only be used on `in` or `out` "
3809 "variables between shader stages");
3811 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3812 _mesa_glsl_error(loc
, state
,
3813 "centroid qualifier may only be used with `in', "
3814 "`out' or `varying' variables between shader stages");
3817 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3818 _mesa_glsl_error(loc
, state
,
3819 "the shared storage qualifiers can only be used with "
3823 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3827 * Get the variable that is being redeclared by this declaration
3829 * Semantic checks to verify the validity of the redeclaration are also
3830 * performed. If semantic checks fail, compilation error will be emitted via
3831 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3834 * A pointer to an existing variable in the current scope if the declaration
3835 * is a redeclaration, \c NULL otherwise.
3837 static ir_variable
*
3838 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3839 struct _mesa_glsl_parse_state
*state
,
3840 bool allow_all_redeclarations
)
3842 /* Check if this declaration is actually a re-declaration, either to
3843 * resize an array or add qualifiers to an existing variable.
3845 * This is allowed for variables in the current scope, or when at
3846 * global scope (for built-ins in the implicit outer scope).
3848 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3849 if (earlier
== NULL
||
3850 (state
->current_function
!= NULL
&&
3851 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3856 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3858 * "It is legal to declare an array without a size and then
3859 * later re-declare the same name as an array of the same
3860 * type and specify a size."
3862 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3863 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3864 /* FINISHME: This doesn't match the qualifiers on the two
3865 * FINISHME: declarations. It's not 100% clear whether this is
3866 * FINISHME: required or not.
3869 const unsigned size
= unsigned(var
->type
->array_size());
3870 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3871 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3872 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3874 earlier
->data
.max_array_access
);
3877 earlier
->type
= var
->type
;
3880 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3881 state
->is_version(150, 0))
3882 && strcmp(var
->name
, "gl_FragCoord") == 0
3883 && earlier
->type
== var
->type
3884 && var
->data
.mode
== ir_var_shader_in
) {
3885 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3888 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3889 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3891 /* According to section 4.3.7 of the GLSL 1.30 spec,
3892 * the following built-in varaibles can be redeclared with an
3893 * interpolation qualifier:
3896 * * gl_FrontSecondaryColor
3897 * * gl_BackSecondaryColor
3899 * * gl_SecondaryColor
3901 } else if (state
->is_version(130, 0)
3902 && (strcmp(var
->name
, "gl_FrontColor") == 0
3903 || strcmp(var
->name
, "gl_BackColor") == 0
3904 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3905 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3906 || strcmp(var
->name
, "gl_Color") == 0
3907 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3908 && earlier
->type
== var
->type
3909 && earlier
->data
.mode
== var
->data
.mode
) {
3910 earlier
->data
.interpolation
= var
->data
.interpolation
;
3912 /* Layout qualifiers for gl_FragDepth. */
3913 } else if ((state
->is_version(420, 0) ||
3914 state
->AMD_conservative_depth_enable
||
3915 state
->ARB_conservative_depth_enable
)
3916 && strcmp(var
->name
, "gl_FragDepth") == 0
3917 && earlier
->type
== var
->type
3918 && earlier
->data
.mode
== var
->data
.mode
) {
3920 /** From the AMD_conservative_depth spec:
3921 * Within any shader, the first redeclarations of gl_FragDepth
3922 * must appear before any use of gl_FragDepth.
3924 if (earlier
->data
.used
) {
3925 _mesa_glsl_error(&loc
, state
,
3926 "the first redeclaration of gl_FragDepth "
3927 "must appear before any use of gl_FragDepth");
3930 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3931 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3932 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3933 _mesa_glsl_error(&loc
, state
,
3934 "gl_FragDepth: depth layout is declared here "
3935 "as '%s, but it was previously declared as "
3937 depth_layout_string(var
->data
.depth_layout
),
3938 depth_layout_string(earlier
->data
.depth_layout
));
3941 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3943 } else if (allow_all_redeclarations
) {
3944 if (earlier
->data
.mode
!= var
->data
.mode
) {
3945 _mesa_glsl_error(&loc
, state
,
3946 "redeclaration of `%s' with incorrect qualifiers",
3948 } else if (earlier
->type
!= var
->type
) {
3949 _mesa_glsl_error(&loc
, state
,
3950 "redeclaration of `%s' has incorrect type",
3954 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3961 * Generate the IR for an initializer in a variable declaration
3964 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3965 ast_fully_specified_type
*type
,
3966 exec_list
*initializer_instructions
,
3967 struct _mesa_glsl_parse_state
*state
)
3969 ir_rvalue
*result
= NULL
;
3971 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3973 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3975 * "All uniform variables are read-only and are initialized either
3976 * directly by an application via API commands, or indirectly by
3979 if (var
->data
.mode
== ir_var_uniform
) {
3980 state
->check_version(120, 0, &initializer_loc
,
3981 "cannot initialize uniform %s",
3985 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3987 * "Buffer variables cannot have initializers."
3989 if (var
->data
.mode
== ir_var_shader_storage
) {
3990 _mesa_glsl_error(&initializer_loc
, state
,
3991 "cannot initialize buffer variable %s",
3995 /* From section 4.1.7 of the GLSL 4.40 spec:
3997 * "Opaque variables [...] are initialized only through the
3998 * OpenGL API; they cannot be declared with an initializer in a
4001 if (var
->type
->contains_opaque()) {
4002 _mesa_glsl_error(&initializer_loc
, state
,
4003 "cannot initialize opaque variable %s",
4007 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4008 _mesa_glsl_error(&initializer_loc
, state
,
4009 "cannot initialize %s shader input / %s %s",
4010 _mesa_shader_stage_to_string(state
->stage
),
4011 (state
->stage
== MESA_SHADER_VERTEX
)
4012 ? "attribute" : "varying",
4016 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4017 _mesa_glsl_error(&initializer_loc
, state
,
4018 "cannot initialize %s shader output %s",
4019 _mesa_shader_stage_to_string(state
->stage
),
4023 /* If the initializer is an ast_aggregate_initializer, recursively store
4024 * type information from the LHS into it, so that its hir() function can do
4027 if (decl
->initializer
->oper
== ast_aggregate
)
4028 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4030 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4031 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4033 /* Calculate the constant value if this is a const or uniform
4036 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4038 * "Declarations of globals without a storage qualifier, or with
4039 * just the const qualifier, may include initializers, in which case
4040 * they will be initialized before the first line of main() is
4041 * executed. Such initializers must be a constant expression."
4043 * The same section of the GLSL ES 3.00.4 spec has similar language.
4045 if (type
->qualifier
.flags
.q
.constant
4046 || type
->qualifier
.flags
.q
.uniform
4047 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4048 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4050 if (new_rhs
!= NULL
) {
4053 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4056 * "A constant expression is one of
4060 * - an expression formed by an operator on operands that are
4061 * all constant expressions, including getting an element of
4062 * a constant array, or a field of a constant structure, or
4063 * components of a constant vector. However, the sequence
4064 * operator ( , ) and the assignment operators ( =, +=, ...)
4065 * are not included in the operators that can create a
4066 * constant expression."
4068 * Section 12.43 (Sequence operator and constant expressions) says:
4070 * "Should the following construct be allowed?
4074 * The expression within the brackets uses the sequence operator
4075 * (',') and returns the integer 3 so the construct is declaring
4076 * a single-dimensional array of size 3. In some languages, the
4077 * construct declares a two-dimensional array. It would be
4078 * preferable to make this construct illegal to avoid confusion.
4080 * One possibility is to change the definition of the sequence
4081 * operator so that it does not return a constant-expression and
4082 * hence cannot be used to declare an array size.
4084 * RESOLUTION: The result of a sequence operator is not a
4085 * constant-expression."
4087 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4088 * contains language almost identical to the section 4.3.3 in the
4089 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4092 ir_constant
*constant_value
= rhs
->constant_expression_value();
4093 if (!constant_value
||
4094 (state
->is_version(430, 300) &&
4095 decl
->initializer
->has_sequence_subexpression())) {
4096 const char *const variable_mode
=
4097 (type
->qualifier
.flags
.q
.constant
)
4099 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4101 /* If ARB_shading_language_420pack is enabled, initializers of
4102 * const-qualified local variables do not have to be constant
4103 * expressions. Const-qualified global variables must still be
4104 * initialized with constant expressions.
4106 if (!state
->has_420pack()
4107 || state
->current_function
== NULL
) {
4108 _mesa_glsl_error(& initializer_loc
, state
,
4109 "initializer of %s variable `%s' must be a "
4110 "constant expression",
4113 if (var
->type
->is_numeric()) {
4114 /* Reduce cascading errors. */
4115 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4116 ? ir_constant::zero(state
, var
->type
) : NULL
;
4120 rhs
= constant_value
;
4121 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4122 ? constant_value
: NULL
;
4125 if (var
->type
->is_numeric()) {
4126 /* Reduce cascading errors. */
4127 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4128 ? ir_constant::zero(state
, var
->type
) : NULL
;
4133 if (rhs
&& !rhs
->type
->is_error()) {
4134 bool temp
= var
->data
.read_only
;
4135 if (type
->qualifier
.flags
.q
.constant
)
4136 var
->data
.read_only
= false;
4138 /* Never emit code to initialize a uniform.
4140 const glsl_type
*initializer_type
;
4141 if (!type
->qualifier
.flags
.q
.uniform
) {
4142 do_assignment(initializer_instructions
, state
,
4147 type
->get_location());
4148 initializer_type
= result
->type
;
4150 initializer_type
= rhs
->type
;
4152 var
->constant_initializer
= rhs
->constant_expression_value();
4153 var
->data
.has_initializer
= true;
4155 /* If the declared variable is an unsized array, it must inherrit
4156 * its full type from the initializer. A declaration such as
4158 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4162 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4164 * The assignment generated in the if-statement (below) will also
4165 * automatically handle this case for non-uniforms.
4167 * If the declared variable is not an array, the types must
4168 * already match exactly. As a result, the type assignment
4169 * here can be done unconditionally. For non-uniforms the call
4170 * to do_assignment can change the type of the initializer (via
4171 * the implicit conversion rules). For uniforms the initializer
4172 * must be a constant expression, and the type of that expression
4173 * was validated above.
4175 var
->type
= initializer_type
;
4177 var
->data
.read_only
= temp
;
4184 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4185 YYLTYPE loc
, ir_variable
*var
,
4186 unsigned num_vertices
,
4188 const char *var_category
)
4190 if (var
->type
->is_unsized_array()) {
4191 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4193 * All geometry shader input unsized array declarations will be
4194 * sized by an earlier input layout qualifier, when present, as per
4195 * the following table.
4197 * Followed by a table mapping each allowed input layout qualifier to
4198 * the corresponding input length.
4200 * Similarly for tessellation control shader outputs.
4202 if (num_vertices
!= 0)
4203 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4206 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4207 * includes the following examples of compile-time errors:
4209 * // code sequence within one shader...
4210 * in vec4 Color1[]; // size unknown
4211 * ...Color1.length()...// illegal, length() unknown
4212 * in vec4 Color2[2]; // size is 2
4213 * ...Color1.length()...// illegal, Color1 still has no size
4214 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4215 * layout(lines) in; // legal, input size is 2, matching
4216 * in vec4 Color4[3]; // illegal, contradicts layout
4219 * To detect the case illustrated by Color3, we verify that the size of
4220 * an explicitly-sized array matches the size of any previously declared
4221 * explicitly-sized array. To detect the case illustrated by Color4, we
4222 * verify that the size of an explicitly-sized array is consistent with
4223 * any previously declared input layout.
4225 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4226 _mesa_glsl_error(&loc
, state
,
4227 "%s size contradicts previously declared layout "
4228 "(size is %u, but layout requires a size of %u)",
4229 var_category
, var
->type
->length
, num_vertices
);
4230 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4231 _mesa_glsl_error(&loc
, state
,
4232 "%s sizes are inconsistent (size is %u, but a "
4233 "previous declaration has size %u)",
4234 var_category
, var
->type
->length
, *size
);
4236 *size
= var
->type
->length
;
4242 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4243 YYLTYPE loc
, ir_variable
*var
)
4245 unsigned num_vertices
= 0;
4247 if (state
->tcs_output_vertices_specified
) {
4248 if (!state
->out_qualifier
->vertices
->
4249 process_qualifier_constant(state
, "vertices",
4250 &num_vertices
, false)) {
4254 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4255 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4256 "GL_MAX_PATCH_VERTICES", num_vertices
);
4261 if (!var
->type
->is_array() && !var
->data
.patch
) {
4262 _mesa_glsl_error(&loc
, state
,
4263 "tessellation control shader outputs must be arrays");
4265 /* To avoid cascading failures, short circuit the checks below. */
4269 if (var
->data
.patch
)
4272 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4273 &state
->tcs_output_size
,
4274 "tessellation control shader output");
4278 * Do additional processing necessary for tessellation control/evaluation shader
4279 * input declarations. This covers both interface block arrays and bare input
4283 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4284 YYLTYPE loc
, ir_variable
*var
)
4286 if (!var
->type
->is_array() && !var
->data
.patch
) {
4287 _mesa_glsl_error(&loc
, state
,
4288 "per-vertex tessellation shader inputs must be arrays");
4289 /* Avoid cascading failures. */
4293 if (var
->data
.patch
)
4296 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
4297 if (var
->type
->is_unsized_array()) {
4298 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4299 state
->Const
.MaxPatchVertices
);
4305 * Do additional processing necessary for geometry shader input declarations
4306 * (this covers both interface blocks arrays and bare input variables).
4309 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4310 YYLTYPE loc
, ir_variable
*var
)
4312 unsigned num_vertices
= 0;
4314 if (state
->gs_input_prim_type_specified
) {
4315 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4318 /* Geometry shader input variables must be arrays. Caller should have
4319 * reported an error for this.
4321 if (!var
->type
->is_array()) {
4322 assert(state
->error
);
4324 /* To avoid cascading failures, short circuit the checks below. */
4328 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4329 &state
->gs_input_size
,
4330 "geometry shader input");
4334 validate_identifier(const char *identifier
, YYLTYPE loc
,
4335 struct _mesa_glsl_parse_state
*state
)
4337 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4339 * "Identifiers starting with "gl_" are reserved for use by
4340 * OpenGL, and may not be declared in a shader as either a
4341 * variable or a function."
4343 if (is_gl_identifier(identifier
)) {
4344 _mesa_glsl_error(&loc
, state
,
4345 "identifier `%s' uses reserved `gl_' prefix",
4347 } else if (strstr(identifier
, "__")) {
4348 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4351 * "In addition, all identifiers containing two
4352 * consecutive underscores (__) are reserved as
4353 * possible future keywords."
4355 * The intention is that names containing __ are reserved for internal
4356 * use by the implementation, and names prefixed with GL_ are reserved
4357 * for use by Khronos. Names simply containing __ are dangerous to use,
4358 * but should be allowed.
4360 * A future version of the GLSL specification will clarify this.
4362 _mesa_glsl_warning(&loc
, state
,
4363 "identifier `%s' uses reserved `__' string",
4369 ast_declarator_list::hir(exec_list
*instructions
,
4370 struct _mesa_glsl_parse_state
*state
)
4373 const struct glsl_type
*decl_type
;
4374 const char *type_name
= NULL
;
4375 ir_rvalue
*result
= NULL
;
4376 YYLTYPE loc
= this->get_location();
4378 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4380 * "To ensure that a particular output variable is invariant, it is
4381 * necessary to use the invariant qualifier. It can either be used to
4382 * qualify a previously declared variable as being invariant
4384 * invariant gl_Position; // make existing gl_Position be invariant"
4386 * In these cases the parser will set the 'invariant' flag in the declarator
4387 * list, and the type will be NULL.
4389 if (this->invariant
) {
4390 assert(this->type
== NULL
);
4392 if (state
->current_function
!= NULL
) {
4393 _mesa_glsl_error(& loc
, state
,
4394 "all uses of `invariant' keyword must be at global "
4398 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4399 assert(decl
->array_specifier
== NULL
);
4400 assert(decl
->initializer
== NULL
);
4402 ir_variable
*const earlier
=
4403 state
->symbols
->get_variable(decl
->identifier
);
4404 if (earlier
== NULL
) {
4405 _mesa_glsl_error(& loc
, state
,
4406 "undeclared variable `%s' cannot be marked "
4407 "invariant", decl
->identifier
);
4408 } else if (!is_varying_var(earlier
, state
->stage
)) {
4409 _mesa_glsl_error(&loc
, state
,
4410 "`%s' cannot be marked invariant; interfaces between "
4411 "shader stages only.", decl
->identifier
);
4412 } else if (earlier
->data
.used
) {
4413 _mesa_glsl_error(& loc
, state
,
4414 "variable `%s' may not be redeclared "
4415 "`invariant' after being used",
4418 earlier
->data
.invariant
= true;
4422 /* Invariant redeclarations do not have r-values.
4427 if (this->precise
) {
4428 assert(this->type
== NULL
);
4430 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4431 assert(decl
->array_specifier
== NULL
);
4432 assert(decl
->initializer
== NULL
);
4434 ir_variable
*const earlier
=
4435 state
->symbols
->get_variable(decl
->identifier
);
4436 if (earlier
== NULL
) {
4437 _mesa_glsl_error(& loc
, state
,
4438 "undeclared variable `%s' cannot be marked "
4439 "precise", decl
->identifier
);
4440 } else if (state
->current_function
!= NULL
&&
4441 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4442 /* Note: we have to check if we're in a function, since
4443 * builtins are treated as having come from another scope.
4445 _mesa_glsl_error(& loc
, state
,
4446 "variable `%s' from an outer scope may not be "
4447 "redeclared `precise' in this scope",
4449 } else if (earlier
->data
.used
) {
4450 _mesa_glsl_error(& loc
, state
,
4451 "variable `%s' may not be redeclared "
4452 "`precise' after being used",
4455 earlier
->data
.precise
= true;
4459 /* Precise redeclarations do not have r-values either. */
4463 assert(this->type
!= NULL
);
4464 assert(!this->invariant
);
4465 assert(!this->precise
);
4467 /* The type specifier may contain a structure definition. Process that
4468 * before any of the variable declarations.
4470 (void) this->type
->specifier
->hir(instructions
, state
);
4472 decl_type
= this->type
->glsl_type(& type_name
, state
);
4474 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4475 * "Buffer variables may only be declared inside interface blocks
4476 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4477 * shader storage blocks. It is a compile-time error to declare buffer
4478 * variables at global scope (outside a block)."
4480 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4481 _mesa_glsl_error(&loc
, state
,
4482 "buffer variables cannot be declared outside "
4483 "interface blocks");
4486 /* An offset-qualified atomic counter declaration sets the default
4487 * offset for the next declaration within the same atomic counter
4490 if (decl_type
&& decl_type
->contains_atomic()) {
4491 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4492 type
->qualifier
.flags
.q
.explicit_offset
) {
4493 unsigned qual_binding
;
4494 unsigned qual_offset
;
4495 if (process_qualifier_constant(state
, &loc
, "binding",
4496 type
->qualifier
.binding
,
4498 && process_qualifier_constant(state
, &loc
, "offset",
4499 type
->qualifier
.offset
,
4501 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4505 ast_type_qualifier allowed_atomic_qual_mask
;
4506 allowed_atomic_qual_mask
.flags
.i
= 0;
4507 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4508 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4509 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4511 type
->qualifier
.validate_flags(&loc
, state
,
4512 "invalid layout qualifier for "
4514 allowed_atomic_qual_mask
);
4517 if (this->declarations
.is_empty()) {
4518 /* If there is no structure involved in the program text, there are two
4519 * possible scenarios:
4521 * - The program text contained something like 'vec4;'. This is an
4522 * empty declaration. It is valid but weird. Emit a warning.
4524 * - The program text contained something like 'S;' and 'S' is not the
4525 * name of a known structure type. This is both invalid and weird.
4528 * - The program text contained something like 'mediump float;'
4529 * when the programmer probably meant 'precision mediump
4530 * float;' Emit a warning with a description of what they
4531 * probably meant to do.
4533 * Note that if decl_type is NULL and there is a structure involved,
4534 * there must have been some sort of error with the structure. In this
4535 * case we assume that an error was already generated on this line of
4536 * code for the structure. There is no need to generate an additional,
4539 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4542 if (decl_type
== NULL
) {
4543 _mesa_glsl_error(&loc
, state
,
4544 "invalid type `%s' in empty declaration",
4547 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4548 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4551 * "... any declaration that leaves the size undefined is
4552 * disallowed as this would add complexity and there are no
4555 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4556 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4557 "or implicitly defined");
4560 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4562 * "The combinations of types and qualifiers that cause
4563 * compile-time or link-time errors are the same whether or not
4564 * the declaration is empty."
4566 validate_array_dimensions(decl_type
, state
, &loc
);
4569 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4570 /* Empty atomic counter declarations are allowed and useful
4571 * to set the default offset qualifier.
4574 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4575 if (this->type
->specifier
->structure
!= NULL
) {
4576 _mesa_glsl_error(&loc
, state
,
4577 "precision qualifiers can't be applied "
4580 static const char *const precision_names
[] = {
4587 _mesa_glsl_warning(&loc
, state
,
4588 "empty declaration with precision "
4589 "qualifier, to set the default precision, "
4590 "use `precision %s %s;'",
4591 precision_names
[this->type
->
4592 qualifier
.precision
],
4595 } else if (this->type
->specifier
->structure
== NULL
) {
4596 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4601 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4602 const struct glsl_type
*var_type
;
4604 const char *identifier
= decl
->identifier
;
4605 /* FINISHME: Emit a warning if a variable declaration shadows a
4606 * FINISHME: declaration at a higher scope.
4609 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4610 if (type_name
!= NULL
) {
4611 _mesa_glsl_error(& loc
, state
,
4612 "invalid type `%s' in declaration of `%s'",
4613 type_name
, decl
->identifier
);
4615 _mesa_glsl_error(& loc
, state
,
4616 "invalid type in declaration of `%s'",
4622 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4626 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4628 _mesa_glsl_error(& loc
, state
,
4629 "invalid type in declaration of `%s'",
4631 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4636 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4639 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4641 /* The 'varying in' and 'varying out' qualifiers can only be used with
4642 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4645 if (this->type
->qualifier
.flags
.q
.varying
) {
4646 if (this->type
->qualifier
.flags
.q
.in
) {
4647 _mesa_glsl_error(& loc
, state
,
4648 "`varying in' qualifier in declaration of "
4649 "`%s' only valid for geometry shaders using "
4650 "ARB_geometry_shader4 or EXT_geometry_shader4",
4652 } else if (this->type
->qualifier
.flags
.q
.out
) {
4653 _mesa_glsl_error(& loc
, state
,
4654 "`varying out' qualifier in declaration of "
4655 "`%s' only valid for geometry shaders using "
4656 "ARB_geometry_shader4 or EXT_geometry_shader4",
4661 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4663 * "Global variables can only use the qualifiers const,
4664 * attribute, uniform, or varying. Only one may be
4667 * Local variables can only use the qualifier const."
4669 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4670 * any extension that adds the 'layout' keyword.
4672 if (!state
->is_version(130, 300)
4673 && !state
->has_explicit_attrib_location()
4674 && !state
->has_separate_shader_objects()
4675 && !state
->ARB_fragment_coord_conventions_enable
) {
4676 if (this->type
->qualifier
.flags
.q
.out
) {
4677 _mesa_glsl_error(& loc
, state
,
4678 "`out' qualifier in declaration of `%s' "
4679 "only valid for function parameters in %s",
4680 decl
->identifier
, state
->get_version_string());
4682 if (this->type
->qualifier
.flags
.q
.in
) {
4683 _mesa_glsl_error(& loc
, state
,
4684 "`in' qualifier in declaration of `%s' "
4685 "only valid for function parameters in %s",
4686 decl
->identifier
, state
->get_version_string());
4688 /* FINISHME: Test for other invalid qualifiers. */
4691 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4693 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4696 if (this->type
->qualifier
.flags
.q
.invariant
) {
4697 if (!is_varying_var(var
, state
->stage
)) {
4698 _mesa_glsl_error(&loc
, state
,
4699 "`%s' cannot be marked invariant; interfaces between "
4700 "shader stages only", var
->name
);
4704 if (state
->current_function
!= NULL
) {
4705 const char *mode
= NULL
;
4706 const char *extra
= "";
4708 /* There is no need to check for 'inout' here because the parser will
4709 * only allow that in function parameter lists.
4711 if (this->type
->qualifier
.flags
.q
.attribute
) {
4713 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4714 mode
= "subroutine uniform";
4715 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4717 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4719 } else if (this->type
->qualifier
.flags
.q
.in
) {
4721 extra
= " or in function parameter list";
4722 } else if (this->type
->qualifier
.flags
.q
.out
) {
4724 extra
= " or in function parameter list";
4728 _mesa_glsl_error(& loc
, state
,
4729 "%s variable `%s' must be declared at "
4731 mode
, var
->name
, extra
);
4733 } else if (var
->data
.mode
== ir_var_shader_in
) {
4734 var
->data
.read_only
= true;
4736 if (state
->stage
== MESA_SHADER_VERTEX
) {
4737 bool error_emitted
= false;
4739 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4741 * "Vertex shader inputs can only be float, floating-point
4742 * vectors, matrices, signed and unsigned integers and integer
4743 * vectors. Vertex shader inputs can also form arrays of these
4744 * types, but not structures."
4746 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4748 * "Vertex shader inputs can only be float, floating-point
4749 * vectors, matrices, signed and unsigned integers and integer
4750 * vectors. They cannot be arrays or structures."
4752 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4754 * "The attribute qualifier can be used only with float,
4755 * floating-point vectors, and matrices. Attribute variables
4756 * cannot be declared as arrays or structures."
4758 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4760 * "Vertex shader inputs can only be float, floating-point
4761 * vectors, matrices, signed and unsigned integers and integer
4762 * vectors. Vertex shader inputs cannot be arrays or
4765 const glsl_type
*check_type
= var
->type
->without_array();
4767 switch (check_type
->base_type
) {
4768 case GLSL_TYPE_FLOAT
:
4770 case GLSL_TYPE_UINT
:
4772 if (state
->is_version(120, 300))
4774 case GLSL_TYPE_DOUBLE
:
4775 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4779 _mesa_glsl_error(& loc
, state
,
4780 "vertex shader input / attribute cannot have "
4782 var
->type
->is_array() ? "array of " : "",
4784 error_emitted
= true;
4787 if (!error_emitted
&& var
->type
->is_array() &&
4788 !state
->check_version(150, 0, &loc
,
4789 "vertex shader input / attribute "
4790 "cannot have array type")) {
4791 error_emitted
= true;
4793 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4794 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4796 * Geometry shader input variables get the per-vertex values
4797 * written out by vertex shader output variables of the same
4798 * names. Since a geometry shader operates on a set of
4799 * vertices, each input varying variable (or input block, see
4800 * interface blocks below) needs to be declared as an array.
4802 if (!var
->type
->is_array()) {
4803 _mesa_glsl_error(&loc
, state
,
4804 "geometry shader inputs must be arrays");
4807 handle_geometry_shader_input_decl(state
, loc
, var
);
4808 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4809 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4811 * It is a compile-time error to declare a fragment shader
4812 * input with, or that contains, any of the following types:
4816 * * An array of arrays
4817 * * An array of structures
4818 * * A structure containing an array
4819 * * A structure containing a structure
4821 if (state
->es_shader
) {
4822 const glsl_type
*check_type
= var
->type
->without_array();
4823 if (check_type
->is_boolean() ||
4824 check_type
->contains_opaque()) {
4825 _mesa_glsl_error(&loc
, state
,
4826 "fragment shader input cannot have type %s",
4829 if (var
->type
->is_array() &&
4830 var
->type
->fields
.array
->is_array()) {
4831 _mesa_glsl_error(&loc
, state
,
4833 "cannot have an array of arrays",
4834 _mesa_shader_stage_to_string(state
->stage
));
4836 if (var
->type
->is_array() &&
4837 var
->type
->fields
.array
->is_record()) {
4838 _mesa_glsl_error(&loc
, state
,
4839 "fragment shader input "
4840 "cannot have an array of structs");
4842 if (var
->type
->is_record()) {
4843 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4844 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4845 var
->type
->fields
.structure
[i
].type
->is_record())
4846 _mesa_glsl_error(&loc
, state
,
4847 "fragement shader input cannot have "
4848 "a struct that contains an "
4853 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4854 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4855 handle_tess_shader_input_decl(state
, loc
, var
);
4857 } else if (var
->data
.mode
== ir_var_shader_out
) {
4858 const glsl_type
*check_type
= var
->type
->without_array();
4860 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4862 * It is a compile-time error to declare a vertex, tessellation
4863 * evaluation, tessellation control, or geometry shader output
4864 * that contains any of the following:
4866 * * A Boolean type (bool, bvec2 ...)
4869 if (check_type
->is_boolean() || check_type
->contains_opaque())
4870 _mesa_glsl_error(&loc
, state
,
4871 "%s shader output cannot have type %s",
4872 _mesa_shader_stage_to_string(state
->stage
),
4875 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4877 * It is a compile-time error to declare a fragment shader output
4878 * that contains any of the following:
4880 * * A Boolean type (bool, bvec2 ...)
4881 * * A double-precision scalar or vector (double, dvec2 ...)
4886 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4887 if (check_type
->is_record() || check_type
->is_matrix())
4888 _mesa_glsl_error(&loc
, state
,
4889 "fragment shader output "
4890 "cannot have struct or matrix type");
4891 switch (check_type
->base_type
) {
4892 case GLSL_TYPE_UINT
:
4894 case GLSL_TYPE_FLOAT
:
4897 _mesa_glsl_error(&loc
, state
,
4898 "fragment shader output cannot have "
4899 "type %s", check_type
->name
);
4903 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4905 * It is a compile-time error to declare a vertex shader output
4906 * with, or that contains, any of the following types:
4910 * * An array of arrays
4911 * * An array of structures
4912 * * A structure containing an array
4913 * * A structure containing a structure
4915 * It is a compile-time error to declare a fragment shader output
4916 * with, or that contains, any of the following types:
4922 * * An array of array
4924 if (state
->es_shader
) {
4925 if (var
->type
->is_array() &&
4926 var
->type
->fields
.array
->is_array()) {
4927 _mesa_glsl_error(&loc
, state
,
4929 "cannot have an array of arrays",
4930 _mesa_shader_stage_to_string(state
->stage
));
4932 if (state
->stage
== MESA_SHADER_VERTEX
) {
4933 if (var
->type
->is_array() &&
4934 var
->type
->fields
.array
->is_record()) {
4935 _mesa_glsl_error(&loc
, state
,
4936 "vertex shader output "
4937 "cannot have an array of structs");
4939 if (var
->type
->is_record()) {
4940 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4941 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4942 var
->type
->fields
.structure
[i
].type
->is_record())
4943 _mesa_glsl_error(&loc
, state
,
4944 "vertex shader output cannot have a "
4945 "struct that contains an "
4952 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4953 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4955 } else if (var
->type
->contains_subroutine()) {
4956 /* declare subroutine uniforms as hidden */
4957 var
->data
.how_declared
= ir_var_hidden
;
4960 /* From section 4.3.4 of the GLSL 4.00 spec:
4961 * "Input variables may not be declared using the patch in qualifier
4962 * in tessellation control or geometry shaders."
4964 * From section 4.3.6 of the GLSL 4.00 spec:
4965 * "It is an error to use patch out in a vertex, tessellation
4966 * evaluation, or geometry shader."
4968 * This doesn't explicitly forbid using them in a fragment shader, but
4969 * that's probably just an oversight.
4971 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4972 && this->type
->qualifier
.flags
.q
.patch
4973 && this->type
->qualifier
.flags
.q
.in
) {
4975 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4976 "tessellation evaluation shader");
4979 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4980 && this->type
->qualifier
.flags
.q
.patch
4981 && this->type
->qualifier
.flags
.q
.out
) {
4983 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4984 "tessellation control shader");
4987 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4989 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4990 state
->check_precision_qualifiers_allowed(&loc
);
4994 /* If a precision qualifier is allowed on a type, it is allowed on
4995 * an array of that type.
4997 if (!(this->type
->qualifier
.precision
== ast_precision_none
4998 || precision_qualifier_allowed(var
->type
->without_array()))) {
5000 _mesa_glsl_error(&loc
, state
,
5001 "precision qualifiers apply only to floating point"
5002 ", integer and opaque types");
5005 /* From section 4.1.7 of the GLSL 4.40 spec:
5007 * "[Opaque types] can only be declared as function
5008 * parameters or uniform-qualified variables."
5010 if (var_type
->contains_opaque() &&
5011 !this->type
->qualifier
.flags
.q
.uniform
) {
5012 _mesa_glsl_error(&loc
, state
,
5013 "opaque variables must be declared uniform");
5016 /* Process the initializer and add its instructions to a temporary
5017 * list. This list will be added to the instruction stream (below) after
5018 * the declaration is added. This is done because in some cases (such as
5019 * redeclarations) the declaration may not actually be added to the
5020 * instruction stream.
5022 exec_list initializer_instructions
;
5024 /* Examine var name here since var may get deleted in the next call */
5025 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5027 ir_variable
*earlier
=
5028 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5029 false /* allow_all_redeclarations */);
5030 if (earlier
!= NULL
) {
5032 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
5033 _mesa_glsl_error(&loc
, state
,
5034 "`%s' has already been redeclared using "
5035 "gl_PerVertex", earlier
->name
);
5037 earlier
->data
.how_declared
= ir_var_declared_normally
;
5040 if (decl
->initializer
!= NULL
) {
5041 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
5043 &initializer_instructions
, state
);
5045 validate_array_dimensions(var_type
, state
, &loc
);
5048 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5050 * "It is an error to write to a const variable outside of
5051 * its declaration, so they must be initialized when
5054 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5055 _mesa_glsl_error(& loc
, state
,
5056 "const declaration of `%s' must be initialized",
5060 if (state
->es_shader
) {
5061 const glsl_type
*const t
= (earlier
== NULL
)
5062 ? var
->type
: earlier
->type
;
5064 if (t
->is_unsized_array())
5065 /* Section 10.17 of the GLSL ES 1.00 specification states that
5066 * unsized array declarations have been removed from the language.
5067 * Arrays that are sized using an initializer are still explicitly
5068 * sized. However, GLSL ES 1.00 does not allow array
5069 * initializers. That is only allowed in GLSL ES 3.00.
5071 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5073 * "An array type can also be formed without specifying a size
5074 * if the definition includes an initializer:
5076 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5077 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5082 _mesa_glsl_error(& loc
, state
,
5083 "unsized array declarations are not allowed in "
5087 /* If the declaration is not a redeclaration, there are a few additional
5088 * semantic checks that must be applied. In addition, variable that was
5089 * created for the declaration should be added to the IR stream.
5091 if (earlier
== NULL
) {
5092 validate_identifier(decl
->identifier
, loc
, state
);
5094 /* Add the variable to the symbol table. Note that the initializer's
5095 * IR was already processed earlier (though it hasn't been emitted
5096 * yet), without the variable in scope.
5098 * This differs from most C-like languages, but it follows the GLSL
5099 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5102 * "Within a declaration, the scope of a name starts immediately
5103 * after the initializer if present or immediately after the name
5104 * being declared if not."
5106 if (!state
->symbols
->add_variable(var
)) {
5107 YYLTYPE loc
= this->get_location();
5108 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5109 "current scope", decl
->identifier
);
5113 /* Push the variable declaration to the top. It means that all the
5114 * variable declarations will appear in a funny last-to-first order,
5115 * but otherwise we run into trouble if a function is prototyped, a
5116 * global var is decled, then the function is defined with usage of
5117 * the global var. See glslparsertest's CorrectModule.frag.
5119 instructions
->push_head(var
);
5122 instructions
->append_list(&initializer_instructions
);
5126 /* Generally, variable declarations do not have r-values. However,
5127 * one is used for the declaration in
5129 * while (bool b = some_condition()) {
5133 * so we return the rvalue from the last seen declaration here.
5140 ast_parameter_declarator::hir(exec_list
*instructions
,
5141 struct _mesa_glsl_parse_state
*state
)
5144 const struct glsl_type
*type
;
5145 const char *name
= NULL
;
5146 YYLTYPE loc
= this->get_location();
5148 type
= this->type
->glsl_type(& name
, state
);
5152 _mesa_glsl_error(& loc
, state
,
5153 "invalid type `%s' in declaration of `%s'",
5154 name
, this->identifier
);
5156 _mesa_glsl_error(& loc
, state
,
5157 "invalid type in declaration of `%s'",
5161 type
= glsl_type::error_type
;
5164 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5166 * "Functions that accept no input arguments need not use void in the
5167 * argument list because prototypes (or definitions) are required and
5168 * therefore there is no ambiguity when an empty argument list "( )" is
5169 * declared. The idiom "(void)" as a parameter list is provided for
5172 * Placing this check here prevents a void parameter being set up
5173 * for a function, which avoids tripping up checks for main taking
5174 * parameters and lookups of an unnamed symbol.
5176 if (type
->is_void()) {
5177 if (this->identifier
!= NULL
)
5178 _mesa_glsl_error(& loc
, state
,
5179 "named parameter cannot have type `void'");
5185 if (formal_parameter
&& (this->identifier
== NULL
)) {
5186 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5190 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5191 * call already handled the "vec4[..] foo" case.
5193 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5195 if (!type
->is_error() && type
->is_unsized_array()) {
5196 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5198 type
= glsl_type::error_type
;
5202 ir_variable
*var
= new(ctx
)
5203 ir_variable(type
, this->identifier
, ir_var_function_in
);
5205 /* Apply any specified qualifiers to the parameter declaration. Note that
5206 * for function parameters the default mode is 'in'.
5208 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5211 /* From section 4.1.7 of the GLSL 4.40 spec:
5213 * "Opaque variables cannot be treated as l-values; hence cannot
5214 * be used as out or inout function parameters, nor can they be
5217 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5218 && type
->contains_opaque()) {
5219 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5220 "contain opaque variables");
5221 type
= glsl_type::error_type
;
5224 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5226 * "When calling a function, expressions that do not evaluate to
5227 * l-values cannot be passed to parameters declared as out or inout."
5229 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5231 * "Other binary or unary expressions, non-dereferenced arrays,
5232 * function names, swizzles with repeated fields, and constants
5233 * cannot be l-values."
5235 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5236 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5238 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5240 && !state
->check_version(120, 100, &loc
,
5241 "arrays cannot be out or inout parameters")) {
5242 type
= glsl_type::error_type
;
5245 instructions
->push_tail(var
);
5247 /* Parameter declarations do not have r-values.
5254 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5256 exec_list
*ir_parameters
,
5257 _mesa_glsl_parse_state
*state
)
5259 ast_parameter_declarator
*void_param
= NULL
;
5262 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5263 param
->formal_parameter
= formal
;
5264 param
->hir(ir_parameters
, state
);
5272 if ((void_param
!= NULL
) && (count
> 1)) {
5273 YYLTYPE loc
= void_param
->get_location();
5275 _mesa_glsl_error(& loc
, state
,
5276 "`void' parameter must be only parameter");
5282 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5284 /* IR invariants disallow function declarations or definitions
5285 * nested within other function definitions. But there is no
5286 * requirement about the relative order of function declarations
5287 * and definitions with respect to one another. So simply insert
5288 * the new ir_function block at the end of the toplevel instruction
5291 state
->toplevel_ir
->push_tail(f
);
5296 ast_function::hir(exec_list
*instructions
,
5297 struct _mesa_glsl_parse_state
*state
)
5300 ir_function
*f
= NULL
;
5301 ir_function_signature
*sig
= NULL
;
5302 exec_list hir_parameters
;
5303 YYLTYPE loc
= this->get_location();
5305 const char *const name
= identifier
;
5307 /* New functions are always added to the top-level IR instruction stream,
5308 * so this instruction list pointer is ignored. See also emit_function
5311 (void) instructions
;
5313 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5315 * "Function declarations (prototypes) cannot occur inside of functions;
5316 * they must be at global scope, or for the built-in functions, outside
5317 * the global scope."
5319 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5321 * "User defined functions may only be defined within the global scope."
5323 * Note that this language does not appear in GLSL 1.10.
5325 if ((state
->current_function
!= NULL
) &&
5326 state
->is_version(120, 100)) {
5327 YYLTYPE loc
= this->get_location();
5328 _mesa_glsl_error(&loc
, state
,
5329 "declaration of function `%s' not allowed within "
5330 "function body", name
);
5333 validate_identifier(name
, this->get_location(), state
);
5335 /* Convert the list of function parameters to HIR now so that they can be
5336 * used below to compare this function's signature with previously seen
5337 * signatures for functions with the same name.
5339 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5341 & hir_parameters
, state
);
5343 const char *return_type_name
;
5344 const glsl_type
*return_type
=
5345 this->return_type
->glsl_type(& return_type_name
, state
);
5348 YYLTYPE loc
= this->get_location();
5349 _mesa_glsl_error(&loc
, state
,
5350 "function `%s' has undeclared return type `%s'",
5351 name
, return_type_name
);
5352 return_type
= glsl_type::error_type
;
5355 /* ARB_shader_subroutine states:
5356 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5357 * subroutine(...) to a function declaration."
5359 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5360 YYLTYPE loc
= this->get_location();
5361 _mesa_glsl_error(&loc
, state
,
5362 "function declaration `%s' cannot have subroutine prepended",
5366 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5367 * "No qualifier is allowed on the return type of a function."
5369 if (this->return_type
->has_qualifiers(state
)) {
5370 YYLTYPE loc
= this->get_location();
5371 _mesa_glsl_error(& loc
, state
,
5372 "function `%s' return type has qualifiers", name
);
5375 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5377 * "Arrays are allowed as arguments and as the return type. In both
5378 * cases, the array must be explicitly sized."
5380 if (return_type
->is_unsized_array()) {
5381 YYLTYPE loc
= this->get_location();
5382 _mesa_glsl_error(& loc
, state
,
5383 "function `%s' return type array must be explicitly "
5387 /* From section 4.1.7 of the GLSL 4.40 spec:
5389 * "[Opaque types] can only be declared as function parameters
5390 * or uniform-qualified variables."
5392 if (return_type
->contains_opaque()) {
5393 YYLTYPE loc
= this->get_location();
5394 _mesa_glsl_error(&loc
, state
,
5395 "function `%s' return type can't contain an opaque type",
5399 /* Create an ir_function if one doesn't already exist. */
5400 f
= state
->symbols
->get_function(name
);
5402 f
= new(ctx
) ir_function(name
);
5403 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5404 if (!state
->symbols
->add_function(f
)) {
5405 /* This function name shadows a non-function use of the same name. */
5406 YYLTYPE loc
= this->get_location();
5407 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5408 "non-function", name
);
5412 emit_function(state
, f
);
5415 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5417 * "A shader cannot redefine or overload built-in functions."
5419 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5421 * "User code can overload the built-in functions but cannot redefine
5424 if (state
->es_shader
&& state
->language_version
>= 300) {
5425 /* Local shader has no exact candidates; check the built-ins. */
5426 _mesa_glsl_initialize_builtin_functions();
5427 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5428 YYLTYPE loc
= this->get_location();
5429 _mesa_glsl_error(& loc
, state
,
5430 "A shader cannot redefine or overload built-in "
5431 "function `%s' in GLSL ES 3.00", name
);
5436 /* Verify that this function's signature either doesn't match a previously
5437 * seen signature for a function with the same name, or, if a match is found,
5438 * that the previously seen signature does not have an associated definition.
5440 if (state
->es_shader
|| f
->has_user_signature()) {
5441 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5443 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5444 if (badvar
!= NULL
) {
5445 YYLTYPE loc
= this->get_location();
5447 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5448 "qualifiers don't match prototype", name
, badvar
);
5451 if (sig
->return_type
!= return_type
) {
5452 YYLTYPE loc
= this->get_location();
5454 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5455 "match prototype", name
);
5458 if (sig
->is_defined
) {
5459 if (is_definition
) {
5460 YYLTYPE loc
= this->get_location();
5461 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5463 /* We just encountered a prototype that exactly matches a
5464 * function that's already been defined. This is redundant,
5465 * and we should ignore it.
5473 /* Verify the return type of main() */
5474 if (strcmp(name
, "main") == 0) {
5475 if (! return_type
->is_void()) {
5476 YYLTYPE loc
= this->get_location();
5478 _mesa_glsl_error(& loc
, state
, "main() must return void");
5481 if (!hir_parameters
.is_empty()) {
5482 YYLTYPE loc
= this->get_location();
5484 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5488 /* Finish storing the information about this new function in its signature.
5491 sig
= new(ctx
) ir_function_signature(return_type
);
5492 f
->add_signature(sig
);
5495 sig
->replace_parameters(&hir_parameters
);
5498 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5501 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5502 unsigned qual_index
;
5503 if (process_qualifier_constant(state
, &loc
, "index",
5504 this->return_type
->qualifier
.index
,
5506 if (!state
->has_explicit_uniform_location()) {
5507 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5508 "GL_ARB_explicit_uniform_location or "
5510 } else if (qual_index
>= MAX_SUBROUTINES
) {
5511 _mesa_glsl_error(&loc
, state
,
5512 "invalid subroutine index (%d) index must "
5513 "be a number between 0 and "
5514 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5515 MAX_SUBROUTINES
- 1);
5517 f
->subroutine_index
= qual_index
;
5522 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5523 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5524 f
->num_subroutine_types
);
5526 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5527 const struct glsl_type
*type
;
5528 /* the subroutine type must be already declared */
5529 type
= state
->symbols
->get_type(decl
->identifier
);
5531 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5534 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5535 ir_function
*fn
= state
->subroutine_types
[i
];
5536 ir_function_signature
*tsig
= NULL
;
5538 if (strcmp(fn
->name
, decl
->identifier
))
5541 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5544 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5546 if (tsig
->return_type
!= sig
->return_type
) {
5547 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5551 f
->subroutine_types
[idx
++] = type
;
5553 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5555 state
->num_subroutines
+ 1);
5556 state
->subroutines
[state
->num_subroutines
] = f
;
5557 state
->num_subroutines
++;
5561 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5562 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5563 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5566 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5568 state
->num_subroutine_types
+ 1);
5569 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5570 state
->num_subroutine_types
++;
5572 f
->is_subroutine
= true;
5575 /* Function declarations (prototypes) do not have r-values.
5582 ast_function_definition::hir(exec_list
*instructions
,
5583 struct _mesa_glsl_parse_state
*state
)
5585 prototype
->is_definition
= true;
5586 prototype
->hir(instructions
, state
);
5588 ir_function_signature
*signature
= prototype
->signature
;
5589 if (signature
== NULL
)
5592 assert(state
->current_function
== NULL
);
5593 state
->current_function
= signature
;
5594 state
->found_return
= false;
5596 /* Duplicate parameters declared in the prototype as concrete variables.
5597 * Add these to the symbol table.
5599 state
->symbols
->push_scope();
5600 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5601 assert(var
->as_variable() != NULL
);
5603 /* The only way a parameter would "exist" is if two parameters have
5606 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5607 YYLTYPE loc
= this->get_location();
5609 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5611 state
->symbols
->add_variable(var
);
5615 /* Convert the body of the function to HIR. */
5616 this->body
->hir(&signature
->body
, state
);
5617 signature
->is_defined
= true;
5619 state
->symbols
->pop_scope();
5621 assert(state
->current_function
== signature
);
5622 state
->current_function
= NULL
;
5624 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5625 YYLTYPE loc
= this->get_location();
5626 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5627 "%s, but no return statement",
5628 signature
->function_name(),
5629 signature
->return_type
->name
);
5632 /* Function definitions do not have r-values.
5639 ast_jump_statement::hir(exec_list
*instructions
,
5640 struct _mesa_glsl_parse_state
*state
)
5647 assert(state
->current_function
);
5649 if (opt_return_value
) {
5650 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5652 /* The value of the return type can be NULL if the shader says
5653 * 'return foo();' and foo() is a function that returns void.
5655 * NOTE: The GLSL spec doesn't say that this is an error. The type
5656 * of the return value is void. If the return type of the function is
5657 * also void, then this should compile without error. Seriously.
5659 const glsl_type
*const ret_type
=
5660 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5662 /* Implicit conversions are not allowed for return values prior to
5663 * ARB_shading_language_420pack.
5665 if (state
->current_function
->return_type
!= ret_type
) {
5666 YYLTYPE loc
= this->get_location();
5668 if (state
->has_420pack()) {
5669 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5671 _mesa_glsl_error(& loc
, state
,
5672 "could not implicitly convert return value "
5673 "to %s, in function `%s'",
5674 state
->current_function
->return_type
->name
,
5675 state
->current_function
->function_name());
5678 _mesa_glsl_error(& loc
, state
,
5679 "`return' with wrong type %s, in function `%s' "
5682 state
->current_function
->function_name(),
5683 state
->current_function
->return_type
->name
);
5685 } else if (state
->current_function
->return_type
->base_type
==
5687 YYLTYPE loc
= this->get_location();
5689 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5690 * specs add a clarification:
5692 * "A void function can only use return without a return argument, even if
5693 * the return argument has void type. Return statements only accept values:
5696 * void func2() { return func1(); } // illegal return statement"
5698 _mesa_glsl_error(& loc
, state
,
5699 "void functions can only use `return' without a "
5703 inst
= new(ctx
) ir_return(ret
);
5705 if (state
->current_function
->return_type
->base_type
!=
5707 YYLTYPE loc
= this->get_location();
5709 _mesa_glsl_error(& loc
, state
,
5710 "`return' with no value, in function %s returning "
5712 state
->current_function
->function_name());
5714 inst
= new(ctx
) ir_return
;
5717 state
->found_return
= true;
5718 instructions
->push_tail(inst
);
5723 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5724 YYLTYPE loc
= this->get_location();
5726 _mesa_glsl_error(& loc
, state
,
5727 "`discard' may only appear in a fragment shader");
5729 instructions
->push_tail(new(ctx
) ir_discard
);
5734 if (mode
== ast_continue
&&
5735 state
->loop_nesting_ast
== NULL
) {
5736 YYLTYPE loc
= this->get_location();
5738 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5739 } else if (mode
== ast_break
&&
5740 state
->loop_nesting_ast
== NULL
&&
5741 state
->switch_state
.switch_nesting_ast
== NULL
) {
5742 YYLTYPE loc
= this->get_location();
5744 _mesa_glsl_error(& loc
, state
,
5745 "break may only appear in a loop or a switch");
5747 /* For a loop, inline the for loop expression again, since we don't
5748 * know where near the end of the loop body the normal copy of it is
5749 * going to be placed. Same goes for the condition for a do-while
5752 if (state
->loop_nesting_ast
!= NULL
&&
5753 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5754 if (state
->loop_nesting_ast
->rest_expression
) {
5755 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5758 if (state
->loop_nesting_ast
->mode
==
5759 ast_iteration_statement::ast_do_while
) {
5760 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5764 if (state
->switch_state
.is_switch_innermost
&&
5765 mode
== ast_continue
) {
5766 /* Set 'continue_inside' to true. */
5767 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5768 ir_dereference_variable
*deref_continue_inside_var
=
5769 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5770 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5773 /* Break out from the switch, continue for the loop will
5774 * be called right after switch. */
5775 ir_loop_jump
*const jump
=
5776 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5777 instructions
->push_tail(jump
);
5779 } else if (state
->switch_state
.is_switch_innermost
&&
5780 mode
== ast_break
) {
5781 /* Force break out of switch by inserting a break. */
5782 ir_loop_jump
*const jump
=
5783 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5784 instructions
->push_tail(jump
);
5786 ir_loop_jump
*const jump
=
5787 new(ctx
) ir_loop_jump((mode
== ast_break
)
5788 ? ir_loop_jump::jump_break
5789 : ir_loop_jump::jump_continue
);
5790 instructions
->push_tail(jump
);
5797 /* Jump instructions do not have r-values.
5804 ast_selection_statement::hir(exec_list
*instructions
,
5805 struct _mesa_glsl_parse_state
*state
)
5809 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5811 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5813 * "Any expression whose type evaluates to a Boolean can be used as the
5814 * conditional expression bool-expression. Vector types are not accepted
5815 * as the expression to if."
5817 * The checks are separated so that higher quality diagnostics can be
5818 * generated for cases where both rules are violated.
5820 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5821 YYLTYPE loc
= this->condition
->get_location();
5823 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5827 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5829 if (then_statement
!= NULL
) {
5830 state
->symbols
->push_scope();
5831 then_statement
->hir(& stmt
->then_instructions
, state
);
5832 state
->symbols
->pop_scope();
5835 if (else_statement
!= NULL
) {
5836 state
->symbols
->push_scope();
5837 else_statement
->hir(& stmt
->else_instructions
, state
);
5838 state
->symbols
->pop_scope();
5841 instructions
->push_tail(stmt
);
5843 /* if-statements do not have r-values.
5850 ast_switch_statement::hir(exec_list
*instructions
,
5851 struct _mesa_glsl_parse_state
*state
)
5855 ir_rvalue
*const test_expression
=
5856 this->test_expression
->hir(instructions
, state
);
5858 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5860 * "The type of init-expression in a switch statement must be a
5863 if (!test_expression
->type
->is_scalar() ||
5864 !test_expression
->type
->is_integer()) {
5865 YYLTYPE loc
= this->test_expression
->get_location();
5867 _mesa_glsl_error(& loc
,
5869 "switch-statement expression must be scalar "
5873 /* Track the switch-statement nesting in a stack-like manner.
5875 struct glsl_switch_state saved
= state
->switch_state
;
5877 state
->switch_state
.is_switch_innermost
= true;
5878 state
->switch_state
.switch_nesting_ast
= this;
5879 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5880 hash_table_pointer_compare
);
5881 state
->switch_state
.previous_default
= NULL
;
5883 /* Initalize is_fallthru state to false.
5885 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5886 state
->switch_state
.is_fallthru_var
=
5887 new(ctx
) ir_variable(glsl_type::bool_type
,
5888 "switch_is_fallthru_tmp",
5890 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5892 ir_dereference_variable
*deref_is_fallthru_var
=
5893 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5894 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5897 /* Initialize continue_inside state to false.
5899 state
->switch_state
.continue_inside
=
5900 new(ctx
) ir_variable(glsl_type::bool_type
,
5901 "continue_inside_tmp",
5903 instructions
->push_tail(state
->switch_state
.continue_inside
);
5905 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5906 ir_dereference_variable
*deref_continue_inside_var
=
5907 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5908 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5911 state
->switch_state
.run_default
=
5912 new(ctx
) ir_variable(glsl_type::bool_type
,
5915 instructions
->push_tail(state
->switch_state
.run_default
);
5917 /* Loop around the switch is used for flow control. */
5918 ir_loop
* loop
= new(ctx
) ir_loop();
5919 instructions
->push_tail(loop
);
5921 /* Cache test expression.
5923 test_to_hir(&loop
->body_instructions
, state
);
5925 /* Emit code for body of switch stmt.
5927 body
->hir(&loop
->body_instructions
, state
);
5929 /* Insert a break at the end to exit loop. */
5930 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5931 loop
->body_instructions
.push_tail(jump
);
5933 /* If we are inside loop, check if continue got called inside switch. */
5934 if (state
->loop_nesting_ast
!= NULL
) {
5935 ir_dereference_variable
*deref_continue_inside
=
5936 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5937 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5938 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5940 if (state
->loop_nesting_ast
!= NULL
) {
5941 if (state
->loop_nesting_ast
->rest_expression
) {
5942 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5945 if (state
->loop_nesting_ast
->mode
==
5946 ast_iteration_statement::ast_do_while
) {
5947 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5950 irif
->then_instructions
.push_tail(jump
);
5951 instructions
->push_tail(irif
);
5954 hash_table_dtor(state
->switch_state
.labels_ht
);
5956 state
->switch_state
= saved
;
5958 /* Switch statements do not have r-values. */
5964 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5965 struct _mesa_glsl_parse_state
*state
)
5969 /* set to true to avoid a duplicate "use of uninitialized variable" warning
5970 * on the switch test case. The first one would be already raised when
5971 * getting the test_expression at ast_switch_statement::hir
5973 test_expression
->set_is_lhs(true);
5974 /* Cache value of test expression. */
5975 ir_rvalue
*const test_val
=
5976 test_expression
->hir(instructions
,
5979 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5982 ir_dereference_variable
*deref_test_var
=
5983 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5985 instructions
->push_tail(state
->switch_state
.test_var
);
5986 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5991 ast_switch_body::hir(exec_list
*instructions
,
5992 struct _mesa_glsl_parse_state
*state
)
5995 stmts
->hir(instructions
, state
);
5997 /* Switch bodies do not have r-values. */
6002 ast_case_statement_list::hir(exec_list
*instructions
,
6003 struct _mesa_glsl_parse_state
*state
)
6005 exec_list default_case
, after_default
, tmp
;
6007 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6008 case_stmt
->hir(&tmp
, state
);
6011 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6012 default_case
.append_list(&tmp
);
6016 /* If default case found, append 'after_default' list. */
6017 if (!default_case
.is_empty())
6018 after_default
.append_list(&tmp
);
6020 instructions
->append_list(&tmp
);
6023 /* Handle the default case. This is done here because default might not be
6024 * the last case. We need to add checks against following cases first to see
6025 * if default should be chosen or not.
6027 if (!default_case
.is_empty()) {
6029 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6030 ir_dereference_variable
*deref_run_default_var
=
6031 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6033 /* Choose to run default case initially, following conditional
6034 * assignments might change this.
6036 ir_assignment
*const init_var
=
6037 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6038 instructions
->push_tail(init_var
);
6040 /* Default case was the last one, no checks required. */
6041 if (after_default
.is_empty()) {
6042 instructions
->append_list(&default_case
);
6046 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6047 ir_assignment
*assign
= ir
->as_assignment();
6052 /* Clone the check between case label and init expression. */
6053 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6054 ir_expression
*clone
= exp
->clone(state
, NULL
);
6056 ir_dereference_variable
*deref_var
=
6057 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6058 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6060 ir_assignment
*const set_false
=
6061 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6063 instructions
->push_tail(set_false
);
6066 /* Append default case and all cases after it. */
6067 instructions
->append_list(&default_case
);
6068 instructions
->append_list(&after_default
);
6071 /* Case statements do not have r-values. */
6076 ast_case_statement::hir(exec_list
*instructions
,
6077 struct _mesa_glsl_parse_state
*state
)
6079 labels
->hir(instructions
, state
);
6081 /* Guard case statements depending on fallthru state. */
6082 ir_dereference_variable
*const deref_fallthru_guard
=
6083 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6084 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6086 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6087 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6089 instructions
->push_tail(test_fallthru
);
6091 /* Case statements do not have r-values. */
6097 ast_case_label_list::hir(exec_list
*instructions
,
6098 struct _mesa_glsl_parse_state
*state
)
6100 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6101 label
->hir(instructions
, state
);
6103 /* Case labels do not have r-values. */
6108 ast_case_label::hir(exec_list
*instructions
,
6109 struct _mesa_glsl_parse_state
*state
)
6113 ir_dereference_variable
*deref_fallthru_var
=
6114 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6116 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6118 /* If not default case, ... */
6119 if (this->test_value
!= NULL
) {
6120 /* Conditionally set fallthru state based on
6121 * comparison of cached test expression value to case label.
6123 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6124 ir_constant
*label_const
= label_rval
->constant_expression_value();
6127 YYLTYPE loc
= this->test_value
->get_location();
6129 _mesa_glsl_error(& loc
, state
,
6130 "switch statement case label must be a "
6131 "constant expression");
6133 /* Stuff a dummy value in to allow processing to continue. */
6134 label_const
= new(ctx
) ir_constant(0);
6136 ast_expression
*previous_label
= (ast_expression
*)
6137 hash_table_find(state
->switch_state
.labels_ht
,
6138 (void *)(uintptr_t)label_const
->value
.u
[0]);
6140 if (previous_label
) {
6141 YYLTYPE loc
= this->test_value
->get_location();
6142 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6144 loc
= previous_label
->get_location();
6145 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6147 hash_table_insert(state
->switch_state
.labels_ht
,
6149 (void *)(uintptr_t)label_const
->value
.u
[0]);
6153 ir_dereference_variable
*deref_test_var
=
6154 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6156 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6161 * From GLSL 4.40 specification section 6.2 ("Selection"):
6163 * "The type of the init-expression value in a switch statement must
6164 * be a scalar int or uint. The type of the constant-expression value
6165 * in a case label also must be a scalar int or uint. When any pair
6166 * of these values is tested for "equal value" and the types do not
6167 * match, an implicit conversion will be done to convert the int to a
6168 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6171 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6172 YYLTYPE loc
= this->test_value
->get_location();
6174 const glsl_type
*type_a
= label_const
->type
;
6175 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6177 /* Check if int->uint implicit conversion is supported. */
6178 bool integer_conversion_supported
=
6179 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6182 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6183 !integer_conversion_supported
) {
6184 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6185 "init-expression and case label (%s != %s)",
6186 type_a
->name
, type_b
->name
);
6188 /* Conversion of the case label. */
6189 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6190 if (!apply_implicit_conversion(glsl_type::uint_type
,
6191 test_cond
->operands
[0], state
))
6192 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6194 /* Conversion of the init-expression value. */
6195 if (!apply_implicit_conversion(glsl_type::uint_type
,
6196 test_cond
->operands
[1], state
))
6197 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6202 ir_assignment
*set_fallthru_on_test
=
6203 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6205 instructions
->push_tail(set_fallthru_on_test
);
6206 } else { /* default case */
6207 if (state
->switch_state
.previous_default
) {
6208 YYLTYPE loc
= this->get_location();
6209 _mesa_glsl_error(& loc
, state
,
6210 "multiple default labels in one switch");
6212 loc
= state
->switch_state
.previous_default
->get_location();
6213 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6215 state
->switch_state
.previous_default
= this;
6217 /* Set fallthru condition on 'run_default' bool. */
6218 ir_dereference_variable
*deref_run_default
=
6219 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6220 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6221 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6225 /* Set falltrhu state. */
6226 ir_assignment
*set_fallthru
=
6227 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6229 instructions
->push_tail(set_fallthru
);
6232 /* Case statements do not have r-values. */
6237 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6238 struct _mesa_glsl_parse_state
*state
)
6242 if (condition
!= NULL
) {
6243 ir_rvalue
*const cond
=
6244 condition
->hir(instructions
, state
);
6247 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6248 YYLTYPE loc
= condition
->get_location();
6250 _mesa_glsl_error(& loc
, state
,
6251 "loop condition must be scalar boolean");
6253 /* As the first code in the loop body, generate a block that looks
6254 * like 'if (!condition) break;' as the loop termination condition.
6256 ir_rvalue
*const not_cond
=
6257 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6259 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6261 ir_jump
*const break_stmt
=
6262 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6264 if_stmt
->then_instructions
.push_tail(break_stmt
);
6265 instructions
->push_tail(if_stmt
);
6272 ast_iteration_statement::hir(exec_list
*instructions
,
6273 struct _mesa_glsl_parse_state
*state
)
6277 /* For-loops and while-loops start a new scope, but do-while loops do not.
6279 if (mode
!= ast_do_while
)
6280 state
->symbols
->push_scope();
6282 if (init_statement
!= NULL
)
6283 init_statement
->hir(instructions
, state
);
6285 ir_loop
*const stmt
= new(ctx
) ir_loop();
6286 instructions
->push_tail(stmt
);
6288 /* Track the current loop nesting. */
6289 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6291 state
->loop_nesting_ast
= this;
6293 /* Likewise, indicate that following code is closest to a loop,
6294 * NOT closest to a switch.
6296 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6297 state
->switch_state
.is_switch_innermost
= false;
6299 if (mode
!= ast_do_while
)
6300 condition_to_hir(&stmt
->body_instructions
, state
);
6303 body
->hir(& stmt
->body_instructions
, state
);
6305 if (rest_expression
!= NULL
)
6306 rest_expression
->hir(& stmt
->body_instructions
, state
);
6308 if (mode
== ast_do_while
)
6309 condition_to_hir(&stmt
->body_instructions
, state
);
6311 if (mode
!= ast_do_while
)
6312 state
->symbols
->pop_scope();
6314 /* Restore previous nesting before returning. */
6315 state
->loop_nesting_ast
= nesting_ast
;
6316 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6318 /* Loops do not have r-values.
6325 * Determine if the given type is valid for establishing a default precision
6328 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6330 * "The precision statement
6332 * precision precision-qualifier type;
6334 * can be used to establish a default precision qualifier. The type field
6335 * can be either int or float or any of the sampler types, and the
6336 * precision-qualifier can be lowp, mediump, or highp."
6338 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6339 * qualifiers on sampler types, but this seems like an oversight (since the
6340 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6341 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6345 is_valid_default_precision_type(const struct glsl_type
*const type
)
6350 switch (type
->base_type
) {
6352 case GLSL_TYPE_FLOAT
:
6353 /* "int" and "float" are valid, but vectors and matrices are not. */
6354 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6355 case GLSL_TYPE_SAMPLER
:
6356 case GLSL_TYPE_IMAGE
:
6357 case GLSL_TYPE_ATOMIC_UINT
:
6366 ast_type_specifier::hir(exec_list
*instructions
,
6367 struct _mesa_glsl_parse_state
*state
)
6369 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6372 YYLTYPE loc
= this->get_location();
6374 /* If this is a precision statement, check that the type to which it is
6375 * applied is either float or int.
6377 * From section 4.5.3 of the GLSL 1.30 spec:
6378 * "The precision statement
6379 * precision precision-qualifier type;
6380 * can be used to establish a default precision qualifier. The type
6381 * field can be either int or float [...]. Any other types or
6382 * qualifiers will result in an error.
6384 if (this->default_precision
!= ast_precision_none
) {
6385 if (!state
->check_precision_qualifiers_allowed(&loc
))
6388 if (this->structure
!= NULL
) {
6389 _mesa_glsl_error(&loc
, state
,
6390 "precision qualifiers do not apply to structures");
6394 if (this->array_specifier
!= NULL
) {
6395 _mesa_glsl_error(&loc
, state
,
6396 "default precision statements do not apply to "
6401 const struct glsl_type
*const type
=
6402 state
->symbols
->get_type(this->type_name
);
6403 if (!is_valid_default_precision_type(type
)) {
6404 _mesa_glsl_error(&loc
, state
,
6405 "default precision statements apply only to "
6406 "float, int, and opaque types");
6410 if (state
->es_shader
) {
6411 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6414 * "Non-precision qualified declarations will use the precision
6415 * qualifier specified in the most recent precision statement
6416 * that is still in scope. The precision statement has the same
6417 * scoping rules as variable declarations. If it is declared
6418 * inside a compound statement, its effect stops at the end of
6419 * the innermost statement it was declared in. Precision
6420 * statements in nested scopes override precision statements in
6421 * outer scopes. Multiple precision statements for the same basic
6422 * type can appear inside the same scope, with later statements
6423 * overriding earlier statements within that scope."
6425 * Default precision specifications follow the same scope rules as
6426 * variables. So, we can track the state of the default precision
6427 * qualifiers in the symbol table, and the rules will just work. This
6428 * is a slight abuse of the symbol table, but it has the semantics
6431 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6432 this->default_precision
);
6435 /* FINISHME: Translate precision statements into IR. */
6439 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6440 * process_record_constructor() can do type-checking on C-style initializer
6441 * expressions of structs, but ast_struct_specifier should only be translated
6442 * to HIR if it is declaring the type of a structure.
6444 * The ->is_declaration field is false for initializers of variables
6445 * declared separately from the struct's type definition.
6447 * struct S { ... }; (is_declaration = true)
6448 * struct T { ... } t = { ... }; (is_declaration = true)
6449 * S s = { ... }; (is_declaration = false)
6451 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6452 return this->structure
->hir(instructions
, state
);
6459 * Process a structure or interface block tree into an array of structure fields
6461 * After parsing, where there are some syntax differnces, structures and
6462 * interface blocks are almost identical. They are similar enough that the
6463 * AST for each can be processed the same way into a set of
6464 * \c glsl_struct_field to describe the members.
6466 * If we're processing an interface block, var_mode should be the type of the
6467 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6468 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6472 * The number of fields processed. A pointer to the array structure fields is
6473 * stored in \c *fields_ret.
6476 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6477 struct _mesa_glsl_parse_state
*state
,
6478 exec_list
*declarations
,
6479 glsl_struct_field
**fields_ret
,
6481 enum glsl_matrix_layout matrix_layout
,
6482 bool allow_reserved_names
,
6483 ir_variable_mode var_mode
,
6484 ast_type_qualifier
*layout
,
6485 unsigned block_stream
,
6486 unsigned block_xfb_buffer
,
6487 unsigned block_xfb_offset
,
6488 unsigned expl_location
,
6489 unsigned expl_align
)
6491 unsigned decl_count
= 0;
6492 unsigned next_offset
= 0;
6494 /* Make an initial pass over the list of fields to determine how
6495 * many there are. Each element in this list is an ast_declarator_list.
6496 * This means that we actually need to count the number of elements in the
6497 * 'declarations' list in each of the elements.
6499 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6500 decl_count
+= decl_list
->declarations
.length();
6503 /* Allocate storage for the fields and process the field
6504 * declarations. As the declarations are processed, try to also convert
6505 * the types to HIR. This ensures that structure definitions embedded in
6506 * other structure definitions or in interface blocks are processed.
6508 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6511 bool first_member
= true;
6512 bool first_member_has_explicit_location
= false;
6515 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6516 const char *type_name
;
6517 YYLTYPE loc
= decl_list
->get_location();
6519 decl_list
->type
->specifier
->hir(instructions
, state
);
6521 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6523 * "Anonymous structures are not supported; so embedded structures
6524 * must have a declarator. A name given to an embedded struct is
6525 * scoped at the same level as the struct it is embedded in."
6527 * The same section of the GLSL 1.20 spec says:
6529 * "Anonymous structures are not supported. Embedded structures are
6532 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6533 * embedded structures in 1.10 only.
6535 if (state
->language_version
!= 110 &&
6536 decl_list
->type
->specifier
->structure
!= NULL
)
6537 _mesa_glsl_error(&loc
, state
,
6538 "embedded structure declarations are not allowed");
6540 const glsl_type
*decl_type
=
6541 decl_list
->type
->glsl_type(& type_name
, state
);
6543 const struct ast_type_qualifier
*const qual
=
6544 &decl_list
->type
->qualifier
;
6546 /* From section 4.3.9 of the GLSL 4.40 spec:
6548 * "[In interface blocks] opaque types are not allowed."
6550 * It should be impossible for decl_type to be NULL here. Cases that
6551 * might naturally lead to decl_type being NULL, especially for the
6552 * is_interface case, will have resulted in compilation having
6553 * already halted due to a syntax error.
6558 if (decl_type
->contains_opaque()) {
6559 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6560 "interface block contains opaque variable");
6563 if (decl_type
->contains_atomic()) {
6564 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6566 * "Members of structures cannot be declared as atomic counter
6569 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6572 if (decl_type
->contains_image()) {
6573 /* FINISHME: Same problem as with atomic counters.
6574 * FINISHME: Request clarification from Khronos and add
6575 * FINISHME: spec quotation here.
6577 _mesa_glsl_error(&loc
, state
, "image in structure");
6581 if (qual
->flags
.q
.explicit_binding
) {
6582 _mesa_glsl_error(&loc
, state
,
6583 "binding layout qualifier cannot be applied "
6584 "to struct or interface block members");
6588 if (!first_member
) {
6589 if (!layout
->flags
.q
.explicit_location
&&
6590 ((first_member_has_explicit_location
&&
6591 !qual
->flags
.q
.explicit_location
) ||
6592 (!first_member_has_explicit_location
&&
6593 qual
->flags
.q
.explicit_location
))) {
6594 _mesa_glsl_error(&loc
, state
,
6595 "when block-level location layout qualifier "
6596 "is not supplied either all members must "
6597 "have a location layout qualifier or all "
6598 "members must not have a location layout "
6602 first_member
= false;
6603 first_member_has_explicit_location
=
6604 qual
->flags
.q
.explicit_location
;
6608 if (qual
->flags
.q
.std140
||
6609 qual
->flags
.q
.std430
||
6610 qual
->flags
.q
.packed
||
6611 qual
->flags
.q
.shared
) {
6612 _mesa_glsl_error(&loc
, state
,
6613 "uniform/shader storage block layout qualifiers "
6614 "std140, std430, packed, and shared can only be "
6615 "applied to uniform/shader storage blocks, not "
6619 if (qual
->flags
.q
.constant
) {
6620 _mesa_glsl_error(&loc
, state
,
6621 "const storage qualifier cannot be applied "
6622 "to struct or interface block members");
6625 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6627 * "A block member may be declared with a stream identifier, but
6628 * the specified stream must match the stream associated with the
6629 * containing block."
6631 if (qual
->flags
.q
.explicit_stream
) {
6632 unsigned qual_stream
;
6633 if (process_qualifier_constant(state
, &loc
, "stream",
6634 qual
->stream
, &qual_stream
) &&
6635 qual_stream
!= block_stream
) {
6636 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6637 "interface block member does not match "
6638 "the interface block (%u vs %u)", qual_stream
,
6644 unsigned explicit_xfb_buffer
= 0;
6645 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6646 unsigned qual_xfb_buffer
;
6647 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6648 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6649 explicit_xfb_buffer
= 1;
6650 if (qual_xfb_buffer
!= block_xfb_buffer
)
6651 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6652 "interface block member does not match "
6653 "the interface block (%u vs %u)",
6654 qual_xfb_buffer
, block_xfb_buffer
);
6656 xfb_buffer
= (int) qual_xfb_buffer
;
6659 explicit_xfb_buffer
= layout
->flags
.q
.xfb_buffer
;
6660 xfb_buffer
= (int) block_xfb_buffer
;
6663 int xfb_stride
= -1;
6664 if (qual
->flags
.q
.explicit_xfb_stride
) {
6665 unsigned qual_xfb_stride
;
6666 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6667 qual
->xfb_stride
, &qual_xfb_stride
)) {
6668 xfb_stride
= (int) qual_xfb_stride
;
6672 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6673 _mesa_glsl_error(&loc
, state
,
6674 "interpolation qualifiers cannot be used "
6675 "with uniform interface blocks");
6678 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6679 qual
->has_auxiliary_storage()) {
6680 _mesa_glsl_error(&loc
, state
,
6681 "auxiliary storage qualifiers cannot be used "
6682 "in uniform blocks or structures.");
6685 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6686 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6687 _mesa_glsl_error(&loc
, state
,
6688 "row_major and column_major can only be "
6689 "applied to interface blocks");
6691 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6694 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6695 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6696 "readonly and writeonly.");
6699 foreach_list_typed (ast_declaration
, decl
, link
,
6700 &decl_list
->declarations
) {
6701 YYLTYPE loc
= decl
->get_location();
6703 if (!allow_reserved_names
)
6704 validate_identifier(decl
->identifier
, loc
, state
);
6706 const struct glsl_type
*field_type
=
6707 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6708 validate_array_dimensions(field_type
, state
, &loc
);
6709 fields
[i
].type
= field_type
;
6710 fields
[i
].name
= decl
->identifier
;
6711 fields
[i
].interpolation
=
6712 interpret_interpolation_qualifier(qual
, field_type
,
6713 var_mode
, state
, &loc
);
6714 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6715 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6716 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6717 fields
[i
].precision
= qual
->precision
;
6718 fields
[i
].offset
= -1;
6719 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6720 fields
[i
].xfb_buffer
= xfb_buffer
;
6721 fields
[i
].xfb_stride
= xfb_stride
;
6723 if (qual
->flags
.q
.explicit_location
) {
6724 unsigned qual_location
;
6725 if (process_qualifier_constant(state
, &loc
, "location",
6726 qual
->location
, &qual_location
)) {
6727 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6728 expl_location
= fields
[i
].location
+
6729 fields
[i
].type
->count_attribute_slots(false);
6732 if (layout
&& layout
->flags
.q
.explicit_location
) {
6733 fields
[i
].location
= expl_location
;
6734 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6736 fields
[i
].location
= -1;
6740 /* Offset can only be used with std430 and std140 layouts an initial
6741 * value of 0 is used for error detection.
6747 if (qual
->flags
.q
.row_major
||
6748 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6754 if(layout
->flags
.q
.std140
) {
6755 align
= field_type
->std140_base_alignment(row_major
);
6756 size
= field_type
->std140_size(row_major
);
6757 } else if (layout
->flags
.q
.std430
) {
6758 align
= field_type
->std430_base_alignment(row_major
);
6759 size
= field_type
->std430_size(row_major
);
6763 if (qual
->flags
.q
.explicit_offset
) {
6764 unsigned qual_offset
;
6765 if (process_qualifier_constant(state
, &loc
, "offset",
6766 qual
->offset
, &qual_offset
)) {
6767 if (align
!= 0 && size
!= 0) {
6768 if (next_offset
> qual_offset
)
6769 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6770 "offset overlaps previous member");
6772 if (qual_offset
% align
) {
6773 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6774 "must be a multiple of the base "
6775 "alignment of %s", field_type
->name
);
6777 fields
[i
].offset
= qual_offset
;
6778 next_offset
= glsl_align(qual_offset
+ size
, align
);
6780 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6781 "with std430 and std140 layouts");
6786 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6787 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6789 if (align
== 0 || size
== 0) {
6790 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6791 "std430 and std140 layouts");
6792 } else if (qual
->flags
.q
.explicit_align
) {
6793 unsigned member_align
;
6794 if (process_qualifier_constant(state
, &loc
, "align",
6795 qual
->align
, &member_align
)) {
6796 if (member_align
== 0 ||
6797 member_align
& (member_align
- 1)) {
6798 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6799 "in not a power of 2");
6801 fields
[i
].offset
= glsl_align(offset
, member_align
);
6802 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6806 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6807 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6811 if (!qual
->flags
.q
.explicit_offset
) {
6812 if (align
!= 0 && size
!= 0)
6813 next_offset
= glsl_align(next_offset
+ size
, align
);
6816 /* From the ARB_enhanced_layouts spec:
6818 * "The given offset applies to the first component of the first
6819 * member of the qualified entity. Then, within the qualified
6820 * entity, subsequent components are each assigned, in order, to
6821 * the next available offset aligned to a multiple of that
6822 * component's size. Aggregate types are flattened down to the
6823 * component level to get this sequence of components."
6825 if (qual
->flags
.q
.explicit_xfb_offset
) {
6826 unsigned xfb_offset
;
6827 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
6828 qual
->offset
, &xfb_offset
)) {
6829 fields
[i
].offset
= xfb_offset
;
6830 block_xfb_offset
= fields
[i
].offset
+
6831 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6834 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
6835 unsigned align
= field_type
->is_double() ? 8 : 4;
6836 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
6838 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6842 /* Propogate row- / column-major information down the fields of the
6843 * structure or interface block. Structures need this data because
6844 * the structure may contain a structure that contains ... a matrix
6845 * that need the proper layout.
6847 if (is_interface
&& layout
&&
6848 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6849 (field_type
->without_array()->is_matrix()
6850 || field_type
->without_array()->is_record())) {
6851 /* If no layout is specified for the field, inherit the layout
6854 fields
[i
].matrix_layout
= matrix_layout
;
6856 if (qual
->flags
.q
.row_major
)
6857 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6858 else if (qual
->flags
.q
.column_major
)
6859 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6861 /* If we're processing an uniform or buffer block, the matrix
6862 * layout must be decided by this point.
6864 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6865 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6868 /* Image qualifiers are allowed on buffer variables, which can only
6869 * be defined inside shader storage buffer objects
6871 if (layout
&& var_mode
== ir_var_shader_storage
) {
6872 /* For readonly and writeonly qualifiers the field definition,
6873 * if set, overwrites the layout qualifier.
6875 if (qual
->flags
.q
.read_only
) {
6876 fields
[i
].image_read_only
= true;
6877 fields
[i
].image_write_only
= false;
6878 } else if (qual
->flags
.q
.write_only
) {
6879 fields
[i
].image_read_only
= false;
6880 fields
[i
].image_write_only
= true;
6882 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6883 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6886 /* For other qualifiers, we set the flag if either the layout
6887 * qualifier or the field qualifier are set
6889 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6890 layout
->flags
.q
.coherent
;
6891 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6892 layout
->flags
.q
._volatile
;
6893 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6894 layout
->flags
.q
.restrict_flag
;
6901 assert(i
== decl_count
);
6903 *fields_ret
= fields
;
6909 ast_struct_specifier::hir(exec_list
*instructions
,
6910 struct _mesa_glsl_parse_state
*state
)
6912 YYLTYPE loc
= this->get_location();
6914 unsigned expl_location
= 0;
6915 if (layout
&& layout
->flags
.q
.explicit_location
) {
6916 if (!process_qualifier_constant(state
, &loc
, "location",
6917 layout
->location
, &expl_location
)) {
6920 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6924 glsl_struct_field
*fields
;
6925 unsigned decl_count
=
6926 ast_process_struct_or_iface_block_members(instructions
,
6928 &this->declarations
,
6931 GLSL_MATRIX_LAYOUT_INHERITED
,
6932 false /* allow_reserved_names */,
6935 0, /* for interface only */
6936 0, /* for interface only */
6937 0, /* for interface only */
6939 0 /* for interface only */);
6941 validate_identifier(this->name
, loc
, state
);
6943 const glsl_type
*t
=
6944 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6946 if (!state
->symbols
->add_type(name
, t
)) {
6947 const glsl_type
*match
= state
->symbols
->get_type(name
);
6948 /* allow struct matching for desktop GL - older UE4 does this */
6949 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
6950 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
6952 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6954 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6956 state
->num_user_structures
+ 1);
6958 s
[state
->num_user_structures
] = t
;
6959 state
->user_structures
= s
;
6960 state
->num_user_structures
++;
6964 /* Structure type definitions do not have r-values.
6971 * Visitor class which detects whether a given interface block has been used.
6973 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6976 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6977 : mode(mode
), block(block
), found(false)
6981 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6983 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6987 return visit_continue
;
6990 bool usage_found() const
6996 ir_variable_mode mode
;
6997 const glsl_type
*block
;
7002 is_unsized_array_last_element(ir_variable
*v
)
7004 const glsl_type
*interface_type
= v
->get_interface_type();
7005 int length
= interface_type
->length
;
7007 assert(v
->type
->is_unsized_array());
7009 /* Check if it is the last element of the interface */
7010 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7016 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7018 var
->data
.image_read_only
= field
.image_read_only
;
7019 var
->data
.image_write_only
= field
.image_write_only
;
7020 var
->data
.image_coherent
= field
.image_coherent
;
7021 var
->data
.image_volatile
= field
.image_volatile
;
7022 var
->data
.image_restrict
= field
.image_restrict
;
7026 ast_interface_block::hir(exec_list
*instructions
,
7027 struct _mesa_glsl_parse_state
*state
)
7029 YYLTYPE loc
= this->get_location();
7031 /* Interface blocks must be declared at global scope */
7032 if (state
->current_function
!= NULL
) {
7033 _mesa_glsl_error(&loc
, state
,
7034 "Interface block `%s' must be declared "
7039 if (!this->layout
.flags
.q
.buffer
&&
7040 this->layout
.flags
.q
.std430
) {
7041 _mesa_glsl_error(&loc
, state
,
7042 "std430 storage block layout qualifier is supported "
7043 "only for shader storage blocks");
7046 /* The ast_interface_block has a list of ast_declarator_lists. We
7047 * need to turn those into ir_variables with an association
7048 * with this uniform block.
7050 enum glsl_interface_packing packing
;
7051 if (this->layout
.flags
.q
.shared
) {
7052 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7053 } else if (this->layout
.flags
.q
.packed
) {
7054 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7055 } else if (this->layout
.flags
.q
.std430
) {
7056 packing
= GLSL_INTERFACE_PACKING_STD430
;
7058 /* The default layout is std140.
7060 packing
= GLSL_INTERFACE_PACKING_STD140
;
7063 ir_variable_mode var_mode
;
7064 const char *iface_type_name
;
7065 if (this->layout
.flags
.q
.in
) {
7066 var_mode
= ir_var_shader_in
;
7067 iface_type_name
= "in";
7068 } else if (this->layout
.flags
.q
.out
) {
7069 var_mode
= ir_var_shader_out
;
7070 iface_type_name
= "out";
7071 } else if (this->layout
.flags
.q
.uniform
) {
7072 var_mode
= ir_var_uniform
;
7073 iface_type_name
= "uniform";
7074 } else if (this->layout
.flags
.q
.buffer
) {
7075 var_mode
= ir_var_shader_storage
;
7076 iface_type_name
= "buffer";
7078 var_mode
= ir_var_auto
;
7079 iface_type_name
= "UNKNOWN";
7080 assert(!"interface block layout qualifier not found!");
7083 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7084 if (this->layout
.flags
.q
.row_major
)
7085 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7086 else if (this->layout
.flags
.q
.column_major
)
7087 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7089 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7090 exec_list declared_variables
;
7091 glsl_struct_field
*fields
;
7093 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7094 * that we don't have incompatible qualifiers
7096 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7097 _mesa_glsl_error(&loc
, state
,
7098 "Interface block sets both readonly and writeonly");
7101 if (this->layout
.flags
.q
.explicit_component
) {
7102 _mesa_glsl_error(&loc
, state
, "component layout qualifier cannot be "
7103 "applied to a matrix, a structure, a block, or an "
7104 "array containing any of these.");
7107 unsigned qual_stream
;
7108 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7110 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7111 /* If the stream qualifier is invalid it doesn't make sense to continue
7112 * on and try to compare stream layouts on member variables against it
7113 * so just return early.
7118 unsigned qual_xfb_buffer
;
7119 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7120 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7121 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7125 unsigned qual_xfb_offset
;
7126 if (layout
.flags
.q
.explicit_xfb_offset
) {
7127 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7128 layout
.offset
, &qual_xfb_offset
)) {
7133 unsigned qual_xfb_stride
;
7134 if (layout
.flags
.q
.explicit_xfb_stride
) {
7135 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7136 layout
.xfb_stride
, &qual_xfb_stride
)) {
7141 unsigned expl_location
= 0;
7142 if (layout
.flags
.q
.explicit_location
) {
7143 if (!process_qualifier_constant(state
, &loc
, "location",
7144 layout
.location
, &expl_location
)) {
7147 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7151 unsigned expl_align
= 0;
7152 if (layout
.flags
.q
.explicit_align
) {
7153 if (!process_qualifier_constant(state
, &loc
, "align",
7154 layout
.align
, &expl_align
)) {
7157 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7158 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7165 unsigned int num_variables
=
7166 ast_process_struct_or_iface_block_members(&declared_variables
,
7168 &this->declarations
,
7172 redeclaring_per_vertex
,
7181 if (!redeclaring_per_vertex
) {
7182 validate_identifier(this->block_name
, loc
, state
);
7184 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7186 * "Block names have no other use within a shader beyond interface
7187 * matching; it is a compile-time error to use a block name at global
7188 * scope for anything other than as a block name."
7190 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7191 if (var
&& !var
->type
->is_interface()) {
7192 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7193 "already used in the scope.",
7198 const glsl_type
*earlier_per_vertex
= NULL
;
7199 if (redeclaring_per_vertex
) {
7200 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7201 * the named interface block gl_in, we can find it by looking at the
7202 * previous declaration of gl_in. Otherwise we can find it by looking
7203 * at the previous decalartion of any of the built-in outputs,
7206 * Also check that the instance name and array-ness of the redeclaration
7210 case ir_var_shader_in
:
7211 if (ir_variable
*earlier_gl_in
=
7212 state
->symbols
->get_variable("gl_in")) {
7213 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7215 _mesa_glsl_error(&loc
, state
,
7216 "redeclaration of gl_PerVertex input not allowed "
7218 _mesa_shader_stage_to_string(state
->stage
));
7220 if (this->instance_name
== NULL
||
7221 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7222 !this->array_specifier
->is_single_dimension()) {
7223 _mesa_glsl_error(&loc
, state
,
7224 "gl_PerVertex input must be redeclared as "
7228 case ir_var_shader_out
:
7229 if (ir_variable
*earlier_gl_Position
=
7230 state
->symbols
->get_variable("gl_Position")) {
7231 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7232 } else if (ir_variable
*earlier_gl_out
=
7233 state
->symbols
->get_variable("gl_out")) {
7234 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7236 _mesa_glsl_error(&loc
, state
,
7237 "redeclaration of gl_PerVertex output not "
7238 "allowed in the %s shader",
7239 _mesa_shader_stage_to_string(state
->stage
));
7241 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7242 if (this->instance_name
== NULL
||
7243 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7244 _mesa_glsl_error(&loc
, state
,
7245 "gl_PerVertex output must be redeclared as "
7249 if (this->instance_name
!= NULL
) {
7250 _mesa_glsl_error(&loc
, state
,
7251 "gl_PerVertex output may not be redeclared with "
7252 "an instance name");
7257 _mesa_glsl_error(&loc
, state
,
7258 "gl_PerVertex must be declared as an input or an "
7263 if (earlier_per_vertex
== NULL
) {
7264 /* An error has already been reported. Bail out to avoid null
7265 * dereferences later in this function.
7270 /* Copy locations from the old gl_PerVertex interface block. */
7271 for (unsigned i
= 0; i
< num_variables
; i
++) {
7272 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7274 _mesa_glsl_error(&loc
, state
,
7275 "redeclaration of gl_PerVertex must be a subset "
7276 "of the built-in members of gl_PerVertex");
7278 fields
[i
].location
=
7279 earlier_per_vertex
->fields
.structure
[j
].location
;
7281 earlier_per_vertex
->fields
.structure
[j
].offset
;
7282 fields
[i
].interpolation
=
7283 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7284 fields
[i
].centroid
=
7285 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7287 earlier_per_vertex
->fields
.structure
[j
].sample
;
7289 earlier_per_vertex
->fields
.structure
[j
].patch
;
7290 fields
[i
].precision
=
7291 earlier_per_vertex
->fields
.structure
[j
].precision
;
7292 fields
[i
].explicit_xfb_buffer
=
7293 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7294 fields
[i
].xfb_buffer
=
7295 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7296 fields
[i
].xfb_stride
=
7297 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7301 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7304 * If a built-in interface block is redeclared, it must appear in
7305 * the shader before any use of any member included in the built-in
7306 * declaration, or a compilation error will result.
7308 * This appears to be a clarification to the behaviour established for
7309 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7310 * regardless of GLSL version.
7312 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7313 v
.run(instructions
);
7314 if (v
.usage_found()) {
7315 _mesa_glsl_error(&loc
, state
,
7316 "redeclaration of a built-in interface block must "
7317 "appear before any use of any member of the "
7322 const glsl_type
*block_type
=
7323 glsl_type::get_interface_instance(fields
,
7328 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7330 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7331 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7334 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7335 YYLTYPE loc
= this->get_location();
7336 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7337 "already taken in the current scope",
7338 this->block_name
, iface_type_name
);
7341 /* Since interface blocks cannot contain statements, it should be
7342 * impossible for the block to generate any instructions.
7344 assert(declared_variables
.is_empty());
7346 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7348 * Geometry shader input variables get the per-vertex values written
7349 * out by vertex shader output variables of the same names. Since a
7350 * geometry shader operates on a set of vertices, each input varying
7351 * variable (or input block, see interface blocks below) needs to be
7352 * declared as an array.
7354 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7355 var_mode
== ir_var_shader_in
) {
7356 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7357 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7358 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7359 this->array_specifier
== NULL
&&
7360 var_mode
== ir_var_shader_in
) {
7361 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7362 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7363 this->array_specifier
== NULL
&&
7364 var_mode
== ir_var_shader_out
) {
7365 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7369 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7372 * "If an instance name (instance-name) is used, then it puts all the
7373 * members inside a scope within its own name space, accessed with the
7374 * field selector ( . ) operator (analogously to structures)."
7376 if (this->instance_name
) {
7377 if (redeclaring_per_vertex
) {
7378 /* When a built-in in an unnamed interface block is redeclared,
7379 * get_variable_being_redeclared() calls
7380 * check_builtin_array_max_size() to make sure that built-in array
7381 * variables aren't redeclared to illegal sizes. But we're looking
7382 * at a redeclaration of a named built-in interface block. So we
7383 * have to manually call check_builtin_array_max_size() for all parts
7384 * of the interface that are arrays.
7386 for (unsigned i
= 0; i
< num_variables
; i
++) {
7387 if (fields
[i
].type
->is_array()) {
7388 const unsigned size
= fields
[i
].type
->array_size();
7389 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7393 validate_identifier(this->instance_name
, loc
, state
);
7398 if (this->array_specifier
!= NULL
) {
7399 const glsl_type
*block_array_type
=
7400 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7402 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7404 * For uniform blocks declared an array, each individual array
7405 * element corresponds to a separate buffer object backing one
7406 * instance of the block. As the array size indicates the number
7407 * of buffer objects needed, uniform block array declarations
7408 * must specify an array size.
7410 * And a few paragraphs later:
7412 * Geometry shader input blocks must be declared as arrays and
7413 * follow the array declaration and linking rules for all
7414 * geometry shader inputs. All other input and output block
7415 * arrays must specify an array size.
7417 * The same applies to tessellation shaders.
7419 * The upshot of this is that the only circumstance where an
7420 * interface array size *doesn't* need to be specified is on a
7421 * geometry shader input, tessellation control shader input,
7422 * tessellation control shader output, and tessellation evaluation
7425 if (block_array_type
->is_unsized_array()) {
7426 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7427 state
->stage
== MESA_SHADER_TESS_CTRL
||
7428 state
->stage
== MESA_SHADER_TESS_EVAL
;
7429 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7431 if (this->layout
.flags
.q
.in
) {
7433 _mesa_glsl_error(&loc
, state
,
7434 "unsized input block arrays not allowed in "
7436 _mesa_shader_stage_to_string(state
->stage
));
7437 } else if (this->layout
.flags
.q
.out
) {
7439 _mesa_glsl_error(&loc
, state
,
7440 "unsized output block arrays not allowed in "
7442 _mesa_shader_stage_to_string(state
->stage
));
7444 /* by elimination, this is a uniform block array */
7445 _mesa_glsl_error(&loc
, state
,
7446 "unsized uniform block arrays not allowed in "
7448 _mesa_shader_stage_to_string(state
->stage
));
7452 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7454 * * Arrays of arrays of blocks are not allowed
7456 if (state
->es_shader
&& block_array_type
->is_array() &&
7457 block_array_type
->fields
.array
->is_array()) {
7458 _mesa_glsl_error(&loc
, state
,
7459 "arrays of arrays interface blocks are "
7463 var
= new(state
) ir_variable(block_array_type
,
7464 this->instance_name
,
7467 var
= new(state
) ir_variable(block_type
,
7468 this->instance_name
,
7472 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7473 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7475 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7476 var
->data
.read_only
= true;
7478 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7479 handle_geometry_shader_input_decl(state
, loc
, var
);
7480 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7481 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7482 handle_tess_shader_input_decl(state
, loc
, var
);
7483 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7484 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7486 for (unsigned i
= 0; i
< num_variables
; i
++) {
7487 if (fields
[i
].type
->is_unsized_array()) {
7488 if (var_mode
== ir_var_shader_storage
) {
7489 if (i
!= (num_variables
- 1)) {
7490 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7491 "only last member of a shader storage block "
7492 "can be defined as unsized array",
7496 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7498 * "If an array is declared as the last member of a shader storage
7499 * block and the size is not specified at compile-time, it is
7500 * sized at run-time. In all other cases, arrays are sized only
7503 if (state
->es_shader
) {
7504 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7505 "only last member of a shader storage block "
7506 "can be defined as unsized array",
7512 if (var
->data
.mode
== ir_var_shader_storage
)
7513 apply_memory_qualifiers(var
, fields
[i
]);
7516 if (ir_variable
*earlier
=
7517 state
->symbols
->get_variable(this->instance_name
)) {
7518 if (!redeclaring_per_vertex
) {
7519 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7520 this->instance_name
);
7522 earlier
->data
.how_declared
= ir_var_declared_normally
;
7523 earlier
->type
= var
->type
;
7524 earlier
->reinit_interface_type(block_type
);
7527 if (this->layout
.flags
.q
.explicit_binding
) {
7528 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7532 var
->data
.stream
= qual_stream
;
7533 if (layout
.flags
.q
.explicit_location
) {
7534 var
->data
.location
= expl_location
;
7535 var
->data
.explicit_location
= true;
7538 state
->symbols
->add_variable(var
);
7539 instructions
->push_tail(var
);
7542 /* In order to have an array size, the block must also be declared with
7545 assert(this->array_specifier
== NULL
);
7547 for (unsigned i
= 0; i
< num_variables
; i
++) {
7549 new(state
) ir_variable(fields
[i
].type
,
7550 ralloc_strdup(state
, fields
[i
].name
),
7552 var
->data
.interpolation
= fields
[i
].interpolation
;
7553 var
->data
.centroid
= fields
[i
].centroid
;
7554 var
->data
.sample
= fields
[i
].sample
;
7555 var
->data
.patch
= fields
[i
].patch
;
7556 var
->data
.stream
= qual_stream
;
7557 var
->data
.location
= fields
[i
].location
;
7559 if (fields
[i
].location
!= -1)
7560 var
->data
.explicit_location
= true;
7562 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7563 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7565 if (fields
[i
].offset
!= -1)
7566 var
->data
.explicit_xfb_offset
= true;
7567 var
->data
.offset
= fields
[i
].offset
;
7569 var
->init_interface_type(block_type
);
7571 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7572 var
->data
.read_only
= true;
7574 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7575 if (state
->es_shader
) {
7576 var
->data
.precision
=
7577 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7581 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7582 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7583 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7585 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7588 if (var
->data
.mode
== ir_var_shader_storage
)
7589 apply_memory_qualifiers(var
, fields
[i
]);
7591 /* Examine var name here since var may get deleted in the next call */
7592 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7594 if (redeclaring_per_vertex
) {
7595 ir_variable
*earlier
=
7596 get_variable_being_redeclared(var
, loc
, state
,
7597 true /* allow_all_redeclarations */);
7598 if (!var_is_gl_id
|| earlier
== NULL
) {
7599 _mesa_glsl_error(&loc
, state
,
7600 "redeclaration of gl_PerVertex can only "
7601 "include built-in variables");
7602 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7603 _mesa_glsl_error(&loc
, state
,
7604 "`%s' has already been redeclared",
7607 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7608 earlier
->reinit_interface_type(block_type
);
7613 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7614 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7616 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7617 * The UBO declaration itself doesn't get an ir_variable unless it
7618 * has an instance name. This is ugly.
7620 if (this->layout
.flags
.q
.explicit_binding
) {
7621 apply_explicit_binding(state
, &loc
, var
,
7622 var
->get_interface_type(), &this->layout
);
7625 if (var
->type
->is_unsized_array()) {
7626 if (var
->is_in_shader_storage_block()) {
7627 if (!is_unsized_array_last_element(var
)) {
7628 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7629 "only last member of a shader storage block "
7630 "can be defined as unsized array",
7633 var
->data
.from_ssbo_unsized_array
= true;
7635 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7637 * "If an array is declared as the last member of a shader storage
7638 * block and the size is not specified at compile-time, it is
7639 * sized at run-time. In all other cases, arrays are sized only
7642 if (state
->es_shader
) {
7643 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7644 "only last member of a shader storage block "
7645 "can be defined as unsized array",
7651 state
->symbols
->add_variable(var
);
7652 instructions
->push_tail(var
);
7655 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7656 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7658 * It is also a compilation error ... to redeclare a built-in
7659 * block and then use a member from that built-in block that was
7660 * not included in the redeclaration.
7662 * This appears to be a clarification to the behaviour established
7663 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7664 * behaviour regardless of GLSL version.
7666 * To prevent the shader from using a member that was not included in
7667 * the redeclaration, we disable any ir_variables that are still
7668 * associated with the old declaration of gl_PerVertex (since we've
7669 * already updated all of the variables contained in the new
7670 * gl_PerVertex to point to it).
7672 * As a side effect this will prevent
7673 * validate_intrastage_interface_blocks() from getting confused and
7674 * thinking there are conflicting definitions of gl_PerVertex in the
7677 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7678 ir_variable
*const var
= node
->as_variable();
7680 var
->get_interface_type() == earlier_per_vertex
&&
7681 var
->data
.mode
== var_mode
) {
7682 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7683 _mesa_glsl_error(&loc
, state
,
7684 "redeclaration of gl_PerVertex cannot "
7685 "follow a redeclaration of `%s'",
7688 state
->symbols
->disable_variable(var
->name
);
7700 ast_tcs_output_layout::hir(exec_list
*instructions
,
7701 struct _mesa_glsl_parse_state
*state
)
7703 YYLTYPE loc
= this->get_location();
7705 unsigned num_vertices
;
7706 if (!state
->out_qualifier
->vertices
->
7707 process_qualifier_constant(state
, "vertices", &num_vertices
,
7709 /* return here to stop cascading incorrect error messages */
7713 /* If any shader outputs occurred before this declaration and specified an
7714 * array size, make sure the size they specified is consistent with the
7717 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7718 _mesa_glsl_error(&loc
, state
,
7719 "this tessellation control shader output layout "
7720 "specifies %u vertices, but a previous output "
7721 "is declared with size %u",
7722 num_vertices
, state
->tcs_output_size
);
7726 state
->tcs_output_vertices_specified
= true;
7728 /* If any shader outputs occurred before this declaration and did not
7729 * specify an array size, their size is determined now.
7731 foreach_in_list (ir_instruction
, node
, instructions
) {
7732 ir_variable
*var
= node
->as_variable();
7733 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7736 /* Note: Not all tessellation control shader output are arrays. */
7737 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7740 if (var
->data
.max_array_access
>= num_vertices
) {
7741 _mesa_glsl_error(&loc
, state
,
7742 "this tessellation control shader output layout "
7743 "specifies %u vertices, but an access to element "
7744 "%u of output `%s' already exists", num_vertices
,
7745 var
->data
.max_array_access
, var
->name
);
7747 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7757 ast_gs_input_layout::hir(exec_list
*instructions
,
7758 struct _mesa_glsl_parse_state
*state
)
7760 YYLTYPE loc
= this->get_location();
7762 /* If any geometry input layout declaration preceded this one, make sure it
7763 * was consistent with this one.
7765 if (state
->gs_input_prim_type_specified
&&
7766 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7767 _mesa_glsl_error(&loc
, state
,
7768 "geometry shader input layout does not match"
7769 " previous declaration");
7773 /* If any shader inputs occurred before this declaration and specified an
7774 * array size, make sure the size they specified is consistent with the
7777 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7778 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7779 _mesa_glsl_error(&loc
, state
,
7780 "this geometry shader input layout implies %u vertices"
7781 " per primitive, but a previous input is declared"
7782 " with size %u", num_vertices
, state
->gs_input_size
);
7786 state
->gs_input_prim_type_specified
= true;
7788 /* If any shader inputs occurred before this declaration and did not
7789 * specify an array size, their size is determined now.
7791 foreach_in_list(ir_instruction
, node
, instructions
) {
7792 ir_variable
*var
= node
->as_variable();
7793 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7796 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7800 if (var
->type
->is_unsized_array()) {
7801 if (var
->data
.max_array_access
>= num_vertices
) {
7802 _mesa_glsl_error(&loc
, state
,
7803 "this geometry shader input layout implies %u"
7804 " vertices, but an access to element %u of input"
7805 " `%s' already exists", num_vertices
,
7806 var
->data
.max_array_access
, var
->name
);
7808 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7819 ast_cs_input_layout::hir(exec_list
*instructions
,
7820 struct _mesa_glsl_parse_state
*state
)
7822 YYLTYPE loc
= this->get_location();
7824 /* From the ARB_compute_shader specification:
7826 * If the local size of the shader in any dimension is greater
7827 * than the maximum size supported by the implementation for that
7828 * dimension, a compile-time error results.
7830 * It is not clear from the spec how the error should be reported if
7831 * the total size of the work group exceeds
7832 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7833 * report it at compile time as well.
7835 GLuint64 total_invocations
= 1;
7836 unsigned qual_local_size
[3];
7837 for (int i
= 0; i
< 3; i
++) {
7839 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7841 /* Infer a local_size of 1 for unspecified dimensions */
7842 if (this->local_size
[i
] == NULL
) {
7843 qual_local_size
[i
] = 1;
7844 } else if (!this->local_size
[i
]->
7845 process_qualifier_constant(state
, local_size_str
,
7846 &qual_local_size
[i
], false)) {
7847 ralloc_free(local_size_str
);
7850 ralloc_free(local_size_str
);
7852 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7853 _mesa_glsl_error(&loc
, state
,
7854 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7856 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7859 total_invocations
*= qual_local_size
[i
];
7860 if (total_invocations
>
7861 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7862 _mesa_glsl_error(&loc
, state
,
7863 "product of local_sizes exceeds "
7864 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7865 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7870 /* If any compute input layout declaration preceded this one, make sure it
7871 * was consistent with this one.
7873 if (state
->cs_input_local_size_specified
) {
7874 for (int i
= 0; i
< 3; i
++) {
7875 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7876 _mesa_glsl_error(&loc
, state
,
7877 "compute shader input layout does not match"
7878 " previous declaration");
7884 state
->cs_input_local_size_specified
= true;
7885 for (int i
= 0; i
< 3; i
++)
7886 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7888 /* We may now declare the built-in constant gl_WorkGroupSize (see
7889 * builtin_variable_generator::generate_constants() for why we didn't
7890 * declare it earlier).
7892 ir_variable
*var
= new(state
->symbols
)
7893 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7894 var
->data
.how_declared
= ir_var_declared_implicitly
;
7895 var
->data
.read_only
= true;
7896 instructions
->push_tail(var
);
7897 state
->symbols
->add_variable(var
);
7898 ir_constant_data data
;
7899 memset(&data
, 0, sizeof(data
));
7900 for (int i
= 0; i
< 3; i
++)
7901 data
.u
[i
] = qual_local_size
[i
];
7902 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7903 var
->constant_initializer
=
7904 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7905 var
->data
.has_initializer
= true;
7912 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7913 exec_list
*instructions
)
7915 bool gl_FragColor_assigned
= false;
7916 bool gl_FragData_assigned
= false;
7917 bool gl_FragSecondaryColor_assigned
= false;
7918 bool gl_FragSecondaryData_assigned
= false;
7919 bool user_defined_fs_output_assigned
= false;
7920 ir_variable
*user_defined_fs_output
= NULL
;
7922 /* It would be nice to have proper location information. */
7924 memset(&loc
, 0, sizeof(loc
));
7926 foreach_in_list(ir_instruction
, node
, instructions
) {
7927 ir_variable
*var
= node
->as_variable();
7929 if (!var
|| !var
->data
.assigned
)
7932 if (strcmp(var
->name
, "gl_FragColor") == 0)
7933 gl_FragColor_assigned
= true;
7934 else if (strcmp(var
->name
, "gl_FragData") == 0)
7935 gl_FragData_assigned
= true;
7936 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7937 gl_FragSecondaryColor_assigned
= true;
7938 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7939 gl_FragSecondaryData_assigned
= true;
7940 else if (!is_gl_identifier(var
->name
)) {
7941 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7942 var
->data
.mode
== ir_var_shader_out
) {
7943 user_defined_fs_output_assigned
= true;
7944 user_defined_fs_output
= var
;
7949 /* From the GLSL 1.30 spec:
7951 * "If a shader statically assigns a value to gl_FragColor, it
7952 * may not assign a value to any element of gl_FragData. If a
7953 * shader statically writes a value to any element of
7954 * gl_FragData, it may not assign a value to
7955 * gl_FragColor. That is, a shader may assign values to either
7956 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7957 * linked together must also consistently write just one of
7958 * these variables. Similarly, if user declared output
7959 * variables are in use (statically assigned to), then the
7960 * built-in variables gl_FragColor and gl_FragData may not be
7961 * assigned to. These incorrect usages all generate compile
7964 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7965 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7966 "`gl_FragColor' and `gl_FragData'");
7967 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7968 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7969 "`gl_FragColor' and `%s'",
7970 user_defined_fs_output
->name
);
7971 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7972 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7973 "`gl_FragSecondaryColorEXT' and"
7974 " `gl_FragSecondaryDataEXT'");
7975 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7976 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7977 "`gl_FragColor' and"
7978 " `gl_FragSecondaryDataEXT'");
7979 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7980 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7982 " `gl_FragSecondaryColorEXT'");
7983 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7984 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7985 "`gl_FragData' and `%s'",
7986 user_defined_fs_output
->name
);
7989 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7990 !state
->EXT_blend_func_extended_enable
) {
7991 _mesa_glsl_error(&loc
, state
,
7992 "Dual source blending requires EXT_blend_func_extended");
7998 remove_per_vertex_blocks(exec_list
*instructions
,
7999 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8001 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8002 * if it exists in this shader type.
8004 const glsl_type
*per_vertex
= NULL
;
8006 case ir_var_shader_in
:
8007 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8008 per_vertex
= gl_in
->get_interface_type();
8010 case ir_var_shader_out
:
8011 if (ir_variable
*gl_Position
=
8012 state
->symbols
->get_variable("gl_Position")) {
8013 per_vertex
= gl_Position
->get_interface_type();
8017 assert(!"Unexpected mode");
8021 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8022 * need to do anything.
8024 if (per_vertex
== NULL
)
8027 /* If the interface block is used by the shader, then we don't need to do
8030 interface_block_usage_visitor
v(mode
, per_vertex
);
8031 v
.run(instructions
);
8032 if (v
.usage_found())
8035 /* Remove any ir_variable declarations that refer to the interface block
8038 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8039 ir_variable
*const var
= node
->as_variable();
8040 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8041 var
->data
.mode
== mode
) {
8042 state
->symbols
->disable_variable(var
->name
);