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 && size
> state
->Const
.MaxClipPlanes
) {
1201 /* From section 7.1 (Vertex Shader Special Variables) of the
1204 * "The gl_ClipDistance array is predeclared as unsized and
1205 * must be sized by the shader either redeclaring it with a
1206 * size or indexing it only with integral constant
1207 * expressions. ... The size can be at most
1208 * gl_MaxClipDistances."
1210 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1211 "be larger than gl_MaxClipDistances (%u)",
1212 state
->Const
.MaxClipPlanes
);
1217 * Create the constant 1, of a which is appropriate for incrementing and
1218 * decrementing values of the given GLSL type. For example, if type is vec4,
1219 * this creates a constant value of 1.0 having type float.
1221 * If the given type is invalid for increment and decrement operators, return
1222 * a floating point 1--the error will be detected later.
1225 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1227 switch (type
->base_type
) {
1228 case GLSL_TYPE_UINT
:
1229 return new(ctx
) ir_constant((unsigned) 1);
1231 return new(ctx
) ir_constant(1);
1233 case GLSL_TYPE_FLOAT
:
1234 return new(ctx
) ir_constant(1.0f
);
1239 ast_expression::hir(exec_list
*instructions
,
1240 struct _mesa_glsl_parse_state
*state
)
1242 return do_hir(instructions
, state
, true);
1246 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1247 struct _mesa_glsl_parse_state
*state
)
1249 do_hir(instructions
, state
, false);
1253 ast_expression::set_is_lhs(bool new_value
)
1255 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1256 * if we lack a identifier we can just skip it.
1258 if (this->primary_expression
.identifier
== NULL
)
1261 this->is_lhs
= new_value
;
1263 /* We need to go through the subexpressions tree to cover cases like
1264 * ast_field_selection
1266 if (this->subexpressions
[0] != NULL
)
1267 this->subexpressions
[0]->set_is_lhs(new_value
);
1271 ast_expression::do_hir(exec_list
*instructions
,
1272 struct _mesa_glsl_parse_state
*state
,
1276 static const int operations
[AST_NUM_OPERATORS
] = {
1277 -1, /* ast_assign doesn't convert to ir_expression. */
1278 -1, /* ast_plus doesn't convert to ir_expression. */
1292 ir_binop_any_nequal
,
1302 /* Note: The following block of expression types actually convert
1303 * to multiple IR instructions.
1305 ir_binop_mul
, /* ast_mul_assign */
1306 ir_binop_div
, /* ast_div_assign */
1307 ir_binop_mod
, /* ast_mod_assign */
1308 ir_binop_add
, /* ast_add_assign */
1309 ir_binop_sub
, /* ast_sub_assign */
1310 ir_binop_lshift
, /* ast_ls_assign */
1311 ir_binop_rshift
, /* ast_rs_assign */
1312 ir_binop_bit_and
, /* ast_and_assign */
1313 ir_binop_bit_xor
, /* ast_xor_assign */
1314 ir_binop_bit_or
, /* ast_or_assign */
1316 -1, /* ast_conditional doesn't convert to ir_expression. */
1317 ir_binop_add
, /* ast_pre_inc. */
1318 ir_binop_sub
, /* ast_pre_dec. */
1319 ir_binop_add
, /* ast_post_inc. */
1320 ir_binop_sub
, /* ast_post_dec. */
1321 -1, /* ast_field_selection doesn't conv to ir_expression. */
1322 -1, /* ast_array_index doesn't convert to ir_expression. */
1323 -1, /* ast_function_call doesn't conv to ir_expression. */
1324 -1, /* ast_identifier doesn't convert to ir_expression. */
1325 -1, /* ast_int_constant doesn't convert to ir_expression. */
1326 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1327 -1, /* ast_float_constant doesn't conv to ir_expression. */
1328 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1329 -1, /* ast_sequence doesn't convert to ir_expression. */
1331 ir_rvalue
*result
= NULL
;
1333 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1334 bool error_emitted
= false;
1337 loc
= this->get_location();
1339 switch (this->oper
) {
1341 assert(!"ast_aggregate: Should never get here.");
1345 this->subexpressions
[0]->set_is_lhs(true);
1346 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1347 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1350 do_assignment(instructions
, state
,
1351 this->subexpressions
[0]->non_lvalue_description
,
1352 op
[0], op
[1], &result
, needs_rvalue
, false,
1353 this->subexpressions
[0]->get_location());
1358 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1360 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1362 error_emitted
= type
->is_error();
1368 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1370 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1372 error_emitted
= type
->is_error();
1374 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1382 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1383 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1385 type
= arithmetic_result_type(op
[0], op
[1],
1386 (this->oper
== ast_mul
),
1388 error_emitted
= type
->is_error();
1390 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1395 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1396 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1398 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1400 assert(operations
[this->oper
] == ir_binop_mod
);
1402 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1404 error_emitted
= type
->is_error();
1409 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1410 error_emitted
= true;
1413 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1414 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1415 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1417 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1419 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1426 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1427 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1429 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1431 /* The relational operators must either generate an error or result
1432 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1434 assert(type
->is_error()
1435 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1436 && type
->is_scalar()));
1438 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1440 error_emitted
= type
->is_error();
1445 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1446 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1448 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1450 * "The equality operators equal (==), and not equal (!=)
1451 * operate on all types. They result in a scalar Boolean. If
1452 * the operand types do not match, then there must be a
1453 * conversion from Section 4.1.10 "Implicit Conversions"
1454 * applied to one operand that can make them match, in which
1455 * case this conversion is done."
1458 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1459 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1460 "no operation `%1$s' exists that takes a left-hand "
1461 "operand of type 'void' or a right operand of type "
1462 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1463 error_emitted
= true;
1464 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1465 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1466 || (op
[0]->type
!= op
[1]->type
)) {
1467 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1468 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1469 error_emitted
= true;
1470 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1471 !state
->check_version(120, 300, &loc
,
1472 "array comparisons forbidden")) {
1473 error_emitted
= true;
1474 } else if ((op
[0]->type
->contains_opaque() ||
1475 op
[1]->type
->contains_opaque())) {
1476 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1477 error_emitted
= true;
1480 if (error_emitted
) {
1481 result
= new(ctx
) ir_constant(false);
1483 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1484 assert(result
->type
== glsl_type::bool_type
);
1491 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1492 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1493 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1494 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1496 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1500 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1502 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1503 error_emitted
= true;
1506 if (!op
[0]->type
->is_integer()) {
1507 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1508 error_emitted
= true;
1511 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1512 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1515 case ast_logic_and
: {
1516 exec_list rhs_instructions
;
1517 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1518 "LHS", &error_emitted
);
1519 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1520 "RHS", &error_emitted
);
1522 if (rhs_instructions
.is_empty()) {
1523 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1524 type
= result
->type
;
1526 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1529 instructions
->push_tail(tmp
);
1531 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1532 instructions
->push_tail(stmt
);
1534 stmt
->then_instructions
.append_list(&rhs_instructions
);
1535 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1536 ir_assignment
*const then_assign
=
1537 new(ctx
) ir_assignment(then_deref
, op
[1]);
1538 stmt
->then_instructions
.push_tail(then_assign
);
1540 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1541 ir_assignment
*const else_assign
=
1542 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1543 stmt
->else_instructions
.push_tail(else_assign
);
1545 result
= new(ctx
) ir_dereference_variable(tmp
);
1551 case ast_logic_or
: {
1552 exec_list rhs_instructions
;
1553 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1554 "LHS", &error_emitted
);
1555 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1556 "RHS", &error_emitted
);
1558 if (rhs_instructions
.is_empty()) {
1559 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1560 type
= result
->type
;
1562 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1565 instructions
->push_tail(tmp
);
1567 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1568 instructions
->push_tail(stmt
);
1570 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1571 ir_assignment
*const then_assign
=
1572 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1573 stmt
->then_instructions
.push_tail(then_assign
);
1575 stmt
->else_instructions
.append_list(&rhs_instructions
);
1576 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1577 ir_assignment
*const else_assign
=
1578 new(ctx
) ir_assignment(else_deref
, op
[1]);
1579 stmt
->else_instructions
.push_tail(else_assign
);
1581 result
= new(ctx
) ir_dereference_variable(tmp
);
1588 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1590 * "The logical binary operators and (&&), or ( | | ), and
1591 * exclusive or (^^). They operate only on two Boolean
1592 * expressions and result in a Boolean expression."
1594 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1596 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1599 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1604 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1605 "operand", &error_emitted
);
1607 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1611 case ast_mul_assign
:
1612 case ast_div_assign
:
1613 case ast_add_assign
:
1614 case ast_sub_assign
: {
1615 this->subexpressions
[0]->set_is_lhs(true);
1616 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1617 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1619 type
= arithmetic_result_type(op
[0], op
[1],
1620 (this->oper
== ast_mul_assign
),
1623 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1627 do_assignment(instructions
, state
,
1628 this->subexpressions
[0]->non_lvalue_description
,
1629 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1630 &result
, needs_rvalue
, false,
1631 this->subexpressions
[0]->get_location());
1633 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1634 * explicitly test for this because none of the binary expression
1635 * operators allow array operands either.
1641 case ast_mod_assign
: {
1642 this->subexpressions
[0]->set_is_lhs(true);
1643 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1644 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1646 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1648 assert(operations
[this->oper
] == ir_binop_mod
);
1650 ir_rvalue
*temp_rhs
;
1651 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1655 do_assignment(instructions
, state
,
1656 this->subexpressions
[0]->non_lvalue_description
,
1657 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1658 &result
, needs_rvalue
, false,
1659 this->subexpressions
[0]->get_location());
1664 case ast_rs_assign
: {
1665 this->subexpressions
[0]->set_is_lhs(true);
1666 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1667 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1668 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1670 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1671 type
, op
[0], op
[1]);
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());
1681 case ast_and_assign
:
1682 case ast_xor_assign
:
1683 case ast_or_assign
: {
1684 this->subexpressions
[0]->set_is_lhs(true);
1685 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1686 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1687 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
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_conditional
: {
1700 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1702 * "The ternary selection operator (?:). It operates on three
1703 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1704 * first expression, which must result in a scalar Boolean."
1706 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1707 "condition", &error_emitted
);
1709 /* The :? operator is implemented by generating an anonymous temporary
1710 * followed by an if-statement. The last instruction in each branch of
1711 * the if-statement assigns a value to the anonymous temporary. This
1712 * temporary is the r-value of the expression.
1714 exec_list then_instructions
;
1715 exec_list else_instructions
;
1717 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1718 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1720 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1722 * "The second and third expressions can be any type, as
1723 * long their types match, or there is a conversion in
1724 * Section 4.1.10 "Implicit Conversions" that can be applied
1725 * to one of the expressions to make their types match. This
1726 * resulting matching type is the type of the entire
1729 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1730 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1731 || (op
[1]->type
!= op
[2]->type
)) {
1732 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1734 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1735 "operator must have matching types");
1736 error_emitted
= true;
1737 type
= glsl_type::error_type
;
1742 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1744 * "The second and third expressions must be the same type, but can
1745 * be of any type other than an array."
1747 if (type
->is_array() &&
1748 !state
->check_version(120, 300, &loc
,
1749 "second and third operands of ?: operator "
1750 "cannot be arrays")) {
1751 error_emitted
= true;
1754 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1756 * "Except for array indexing, structure member selection, and
1757 * parentheses, opaque variables are not allowed to be operands in
1758 * expressions; such use results in a compile-time error."
1760 if (type
->contains_opaque()) {
1761 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1762 "of the ?: operator");
1763 error_emitted
= true;
1766 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1768 if (then_instructions
.is_empty()
1769 && else_instructions
.is_empty()
1770 && cond_val
!= NULL
) {
1771 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1773 /* The copy to conditional_tmp reads the whole array. */
1774 if (type
->is_array()) {
1775 mark_whole_array_access(op
[1]);
1776 mark_whole_array_access(op
[2]);
1779 ir_variable
*const tmp
=
1780 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1781 instructions
->push_tail(tmp
);
1783 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1784 instructions
->push_tail(stmt
);
1786 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1787 ir_dereference
*const then_deref
=
1788 new(ctx
) ir_dereference_variable(tmp
);
1789 ir_assignment
*const then_assign
=
1790 new(ctx
) ir_assignment(then_deref
, op
[1]);
1791 stmt
->then_instructions
.push_tail(then_assign
);
1793 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1794 ir_dereference
*const else_deref
=
1795 new(ctx
) ir_dereference_variable(tmp
);
1796 ir_assignment
*const else_assign
=
1797 new(ctx
) ir_assignment(else_deref
, op
[2]);
1798 stmt
->else_instructions
.push_tail(else_assign
);
1800 result
= new(ctx
) ir_dereference_variable(tmp
);
1807 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1808 ? "pre-increment operation" : "pre-decrement operation";
1810 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1811 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1813 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1815 ir_rvalue
*temp_rhs
;
1816 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1820 do_assignment(instructions
, state
,
1821 this->subexpressions
[0]->non_lvalue_description
,
1822 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1823 &result
, needs_rvalue
, false,
1824 this->subexpressions
[0]->get_location());
1829 case ast_post_dec
: {
1830 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1831 ? "post-increment operation" : "post-decrement operation";
1832 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1833 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1835 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1837 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1839 ir_rvalue
*temp_rhs
;
1840 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1843 /* Get a temporary of a copy of the lvalue before it's modified.
1844 * This may get thrown away later.
1846 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1848 ir_rvalue
*junk_rvalue
;
1850 do_assignment(instructions
, state
,
1851 this->subexpressions
[0]->non_lvalue_description
,
1852 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1853 &junk_rvalue
, false, false,
1854 this->subexpressions
[0]->get_location());
1859 case ast_field_selection
:
1860 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1863 case ast_array_index
: {
1864 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1866 /* Getting if an array is being used uninitialized is beyond what we get
1867 * from ir_value.data.assigned. Setting is_lhs as true would force to
1868 * not raise a uninitialized warning when using an array
1870 subexpressions
[0]->set_is_lhs(true);
1871 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1872 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1874 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1877 if (result
->type
->is_error())
1878 error_emitted
= true;
1883 case ast_unsized_array_dim
:
1884 assert(!"ast_unsized_array_dim: Should never get here.");
1887 case ast_function_call
:
1888 /* Should *NEVER* get here. ast_function_call should always be handled
1889 * by ast_function_expression::hir.
1894 case ast_identifier
: {
1895 /* ast_identifier can appear several places in a full abstract syntax
1896 * tree. This particular use must be at location specified in the grammar
1897 * as 'variable_identifier'.
1900 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1903 var
->data
.used
= true;
1904 result
= new(ctx
) ir_dereference_variable(var
);
1906 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
1908 && result
->variable_referenced()->data
.assigned
!= true
1909 && !is_gl_identifier(var
->name
)) {
1910 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
1911 this->primary_expression
.identifier
);
1914 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1915 this->primary_expression
.identifier
);
1917 result
= ir_rvalue::error_value(ctx
);
1918 error_emitted
= true;
1923 case ast_int_constant
:
1924 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1927 case ast_uint_constant
:
1928 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1931 case ast_float_constant
:
1932 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1935 case ast_bool_constant
:
1936 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1939 case ast_double_constant
:
1940 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1943 case ast_sequence
: {
1944 /* It should not be possible to generate a sequence in the AST without
1945 * any expressions in it.
1947 assert(!this->expressions
.is_empty());
1949 /* The r-value of a sequence is the last expression in the sequence. If
1950 * the other expressions in the sequence do not have side-effects (and
1951 * therefore add instructions to the instruction list), they get dropped
1954 exec_node
*previous_tail_pred
= NULL
;
1955 YYLTYPE previous_operand_loc
= loc
;
1957 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1958 /* If one of the operands of comma operator does not generate any
1959 * code, we want to emit a warning. At each pass through the loop
1960 * previous_tail_pred will point to the last instruction in the
1961 * stream *before* processing the previous operand. Naturally,
1962 * instructions->tail_pred will point to the last instruction in the
1963 * stream *after* processing the previous operand. If the two
1964 * pointers match, then the previous operand had no effect.
1966 * The warning behavior here differs slightly from GCC. GCC will
1967 * only emit a warning if none of the left-hand operands have an
1968 * effect. However, it will emit a warning for each. I believe that
1969 * there are some cases in C (especially with GCC extensions) where
1970 * it is useful to have an intermediate step in a sequence have no
1971 * effect, but I don't think these cases exist in GLSL. Either way,
1972 * it would be a giant hassle to replicate that behavior.
1974 if (previous_tail_pred
== instructions
->tail_pred
) {
1975 _mesa_glsl_warning(&previous_operand_loc
, state
,
1976 "left-hand operand of comma expression has "
1980 /* tail_pred is directly accessed instead of using the get_tail()
1981 * method for performance reasons. get_tail() has extra code to
1982 * return NULL when the list is empty. We don't care about that
1983 * here, so using tail_pred directly is fine.
1985 previous_tail_pred
= instructions
->tail_pred
;
1986 previous_operand_loc
= ast
->get_location();
1988 result
= ast
->hir(instructions
, state
);
1991 /* Any errors should have already been emitted in the loop above.
1993 error_emitted
= true;
1997 type
= NULL
; /* use result->type, not type. */
1998 assert(result
!= NULL
|| !needs_rvalue
);
2000 if (result
&& result
->type
->is_error() && !error_emitted
)
2001 _mesa_glsl_error(& loc
, state
, "type mismatch");
2007 ast_expression::has_sequence_subexpression() const
2009 switch (this->oper
) {
2018 return this->subexpressions
[0]->has_sequence_subexpression();
2040 case ast_array_index
:
2041 case ast_mul_assign
:
2042 case ast_div_assign
:
2043 case ast_add_assign
:
2044 case ast_sub_assign
:
2045 case ast_mod_assign
:
2048 case ast_and_assign
:
2049 case ast_xor_assign
:
2051 return this->subexpressions
[0]->has_sequence_subexpression() ||
2052 this->subexpressions
[1]->has_sequence_subexpression();
2054 case ast_conditional
:
2055 return this->subexpressions
[0]->has_sequence_subexpression() ||
2056 this->subexpressions
[1]->has_sequence_subexpression() ||
2057 this->subexpressions
[2]->has_sequence_subexpression();
2062 case ast_field_selection
:
2063 case ast_identifier
:
2064 case ast_int_constant
:
2065 case ast_uint_constant
:
2066 case ast_float_constant
:
2067 case ast_bool_constant
:
2068 case ast_double_constant
:
2072 unreachable("ast_aggregate: Should never get here.");
2074 case ast_function_call
:
2075 unreachable("should be handled by ast_function_expression::hir");
2077 case ast_unsized_array_dim
:
2078 unreachable("ast_unsized_array_dim: Should never get here.");
2085 ast_expression_statement::hir(exec_list
*instructions
,
2086 struct _mesa_glsl_parse_state
*state
)
2088 /* It is possible to have expression statements that don't have an
2089 * expression. This is the solitary semicolon:
2091 * for (i = 0; i < 5; i++)
2094 * In this case the expression will be NULL. Test for NULL and don't do
2095 * anything in that case.
2097 if (expression
!= NULL
)
2098 expression
->hir_no_rvalue(instructions
, state
);
2100 /* Statements do not have r-values.
2107 ast_compound_statement::hir(exec_list
*instructions
,
2108 struct _mesa_glsl_parse_state
*state
)
2111 state
->symbols
->push_scope();
2113 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2114 ast
->hir(instructions
, state
);
2117 state
->symbols
->pop_scope();
2119 /* Compound statements do not have r-values.
2125 * Evaluate the given exec_node (which should be an ast_node representing
2126 * a single array dimension) and return its integer value.
2129 process_array_size(exec_node
*node
,
2130 struct _mesa_glsl_parse_state
*state
)
2132 exec_list dummy_instructions
;
2134 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2137 * Dimensions other than the outermost dimension can by unsized if they
2138 * are immediately sized by a constructor or initializer.
2140 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2143 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2144 YYLTYPE loc
= array_size
->get_location();
2147 _mesa_glsl_error(& loc
, state
,
2148 "array size could not be resolved");
2152 if (!ir
->type
->is_integer()) {
2153 _mesa_glsl_error(& loc
, state
,
2154 "array size must be integer type");
2158 if (!ir
->type
->is_scalar()) {
2159 _mesa_glsl_error(& loc
, state
,
2160 "array size must be scalar type");
2164 ir_constant
*const size
= ir
->constant_expression_value();
2166 (state
->is_version(120, 300) &&
2167 array_size
->has_sequence_subexpression())) {
2168 _mesa_glsl_error(& loc
, state
, "array size must be a "
2169 "constant valued expression");
2173 if (size
->value
.i
[0] <= 0) {
2174 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2178 assert(size
->type
== ir
->type
);
2180 /* If the array size is const (and we've verified that
2181 * it is) then no instructions should have been emitted
2182 * when we converted it to HIR. If they were emitted,
2183 * then either the array size isn't const after all, or
2184 * we are emitting unnecessary instructions.
2186 assert(dummy_instructions
.is_empty());
2188 return size
->value
.u
[0];
2191 static const glsl_type
*
2192 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2193 ast_array_specifier
*array_specifier
,
2194 struct _mesa_glsl_parse_state
*state
)
2196 const glsl_type
*array_type
= base
;
2198 if (array_specifier
!= NULL
) {
2199 if (base
->is_array()) {
2201 /* From page 19 (page 25) of the GLSL 1.20 spec:
2203 * "Only one-dimensional arrays may be declared."
2205 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2206 return glsl_type::error_type
;
2210 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2211 !node
->is_head_sentinel(); node
= node
->prev
) {
2212 unsigned array_size
= process_array_size(node
, state
);
2213 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2221 precision_qualifier_allowed(const glsl_type
*type
)
2223 /* Precision qualifiers apply to floating point, integer and opaque
2226 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2227 * "Any floating point or any integer declaration can have the type
2228 * preceded by one of these precision qualifiers [...] Literal
2229 * constants do not have precision qualifiers. Neither do Boolean
2232 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2235 * "Precision qualifiers are added for code portability with OpenGL
2236 * ES, not for functionality. They have the same syntax as in OpenGL
2239 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2241 * "uniform lowp sampler2D sampler;
2244 * lowp vec4 col = texture2D (sampler, coord);
2245 * // texture2D returns lowp"
2247 * From this, we infer that GLSL 1.30 (and later) should allow precision
2248 * qualifiers on sampler types just like float and integer types.
2250 return (type
->is_float()
2251 || type
->is_integer()
2252 || type
->contains_opaque())
2253 && !type
->without_array()->is_record();
2257 ast_type_specifier::glsl_type(const char **name
,
2258 struct _mesa_glsl_parse_state
*state
) const
2260 const struct glsl_type
*type
;
2262 type
= state
->symbols
->get_type(this->type_name
);
2263 *name
= this->type_name
;
2265 YYLTYPE loc
= this->get_location();
2266 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2272 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2274 * "The precision statement
2276 * precision precision-qualifier type;
2278 * can be used to establish a default precision qualifier. The type field can
2279 * be either int or float or any of the sampler types, (...) If type is float,
2280 * the directive applies to non-precision-qualified floating point type
2281 * (scalar, vector, and matrix) declarations. If type is int, the directive
2282 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2283 * and unsigned) declarations."
2285 * We use the symbol table to keep the values of the default precisions for
2286 * each 'type' in each scope and we use the 'type' string from the precision
2287 * statement as key in the symbol table. When we want to retrieve the default
2288 * precision associated with a given glsl_type we need to know the type string
2289 * associated with it. This is what this function returns.
2292 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2294 switch (type
->base_type
) {
2295 case GLSL_TYPE_FLOAT
:
2297 case GLSL_TYPE_UINT
:
2300 case GLSL_TYPE_ATOMIC_UINT
:
2301 return "atomic_uint";
2302 case GLSL_TYPE_IMAGE
:
2304 case GLSL_TYPE_SAMPLER
: {
2305 const unsigned type_idx
=
2306 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2307 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2308 assert(type_idx
< 4);
2309 switch (type
->sampled_type
) {
2310 case GLSL_TYPE_FLOAT
:
2311 switch (type
->sampler_dimensionality
) {
2312 case GLSL_SAMPLER_DIM_1D
: {
2313 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2314 static const char *const names
[4] = {
2315 "sampler1D", "sampler1DArray",
2316 "sampler1DShadow", "sampler1DArrayShadow"
2318 return names
[type_idx
];
2320 case GLSL_SAMPLER_DIM_2D
: {
2321 static const char *const names
[8] = {
2322 "sampler2D", "sampler2DArray",
2323 "sampler2DShadow", "sampler2DArrayShadow",
2324 "image2D", "image2DArray", NULL
, NULL
2326 return names
[offset
+ type_idx
];
2328 case GLSL_SAMPLER_DIM_3D
: {
2329 static const char *const names
[8] = {
2330 "sampler3D", NULL
, NULL
, NULL
,
2331 "image3D", NULL
, NULL
, NULL
2333 return names
[offset
+ type_idx
];
2335 case GLSL_SAMPLER_DIM_CUBE
: {
2336 static const char *const names
[8] = {
2337 "samplerCube", "samplerCubeArray",
2338 "samplerCubeShadow", "samplerCubeArrayShadow",
2339 "imageCube", NULL
, NULL
, NULL
2341 return names
[offset
+ type_idx
];
2343 case GLSL_SAMPLER_DIM_MS
: {
2344 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2345 static const char *const names
[4] = {
2346 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2348 return names
[type_idx
];
2350 case GLSL_SAMPLER_DIM_RECT
: {
2351 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2352 static const char *const names
[4] = {
2353 "samplerRect", NULL
, "samplerRectShadow", NULL
2355 return names
[type_idx
];
2357 case GLSL_SAMPLER_DIM_BUF
: {
2358 static const char *const names
[8] = {
2359 "samplerBuffer", NULL
, NULL
, NULL
,
2360 "imageBuffer", NULL
, NULL
, NULL
2362 return names
[offset
+ type_idx
];
2364 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2365 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2366 static const char *const names
[4] = {
2367 "samplerExternalOES", NULL
, NULL
, NULL
2369 return names
[type_idx
];
2372 unreachable("Unsupported sampler/image dimensionality");
2373 } /* sampler/image float dimensionality */
2376 switch (type
->sampler_dimensionality
) {
2377 case GLSL_SAMPLER_DIM_1D
: {
2378 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2379 static const char *const names
[4] = {
2380 "isampler1D", "isampler1DArray", NULL
, NULL
2382 return names
[type_idx
];
2384 case GLSL_SAMPLER_DIM_2D
: {
2385 static const char *const names
[8] = {
2386 "isampler2D", "isampler2DArray", NULL
, NULL
,
2387 "iimage2D", "iimage2DArray", NULL
, NULL
2389 return names
[offset
+ type_idx
];
2391 case GLSL_SAMPLER_DIM_3D
: {
2392 static const char *const names
[8] = {
2393 "isampler3D", NULL
, NULL
, NULL
,
2394 "iimage3D", NULL
, NULL
, NULL
2396 return names
[offset
+ type_idx
];
2398 case GLSL_SAMPLER_DIM_CUBE
: {
2399 static const char *const names
[8] = {
2400 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2401 "iimageCube", NULL
, NULL
, NULL
2403 return names
[offset
+ type_idx
];
2405 case GLSL_SAMPLER_DIM_MS
: {
2406 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2407 static const char *const names
[4] = {
2408 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2410 return names
[type_idx
];
2412 case GLSL_SAMPLER_DIM_RECT
: {
2413 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2414 static const char *const names
[4] = {
2415 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2417 return names
[type_idx
];
2419 case GLSL_SAMPLER_DIM_BUF
: {
2420 static const char *const names
[8] = {
2421 "isamplerBuffer", NULL
, NULL
, NULL
,
2422 "iimageBuffer", NULL
, NULL
, NULL
2424 return names
[offset
+ type_idx
];
2427 unreachable("Unsupported isampler/iimage dimensionality");
2428 } /* sampler/image int dimensionality */
2430 case GLSL_TYPE_UINT
:
2431 switch (type
->sampler_dimensionality
) {
2432 case GLSL_SAMPLER_DIM_1D
: {
2433 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2434 static const char *const names
[4] = {
2435 "usampler1D", "usampler1DArray", NULL
, NULL
2437 return names
[type_idx
];
2439 case GLSL_SAMPLER_DIM_2D
: {
2440 static const char *const names
[8] = {
2441 "usampler2D", "usampler2DArray", NULL
, NULL
,
2442 "uimage2D", "uimage2DArray", NULL
, NULL
2444 return names
[offset
+ type_idx
];
2446 case GLSL_SAMPLER_DIM_3D
: {
2447 static const char *const names
[8] = {
2448 "usampler3D", NULL
, NULL
, NULL
,
2449 "uimage3D", NULL
, NULL
, NULL
2451 return names
[offset
+ type_idx
];
2453 case GLSL_SAMPLER_DIM_CUBE
: {
2454 static const char *const names
[8] = {
2455 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2456 "uimageCube", NULL
, NULL
, NULL
2458 return names
[offset
+ type_idx
];
2460 case GLSL_SAMPLER_DIM_MS
: {
2461 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2462 static const char *const names
[4] = {
2463 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2465 return names
[type_idx
];
2467 case GLSL_SAMPLER_DIM_RECT
: {
2468 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2469 static const char *const names
[4] = {
2470 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2472 return names
[type_idx
];
2474 case GLSL_SAMPLER_DIM_BUF
: {
2475 static const char *const names
[8] = {
2476 "usamplerBuffer", NULL
, NULL
, NULL
,
2477 "uimageBuffer", NULL
, NULL
, NULL
2479 return names
[offset
+ type_idx
];
2482 unreachable("Unsupported usampler/uimage dimensionality");
2483 } /* sampler/image uint dimensionality */
2486 unreachable("Unsupported sampler/image type");
2487 } /* sampler/image type */
2489 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2492 unreachable("Unsupported type");
2497 select_gles_precision(unsigned qual_precision
,
2498 const glsl_type
*type
,
2499 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2501 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2502 * In GLES we take the precision from the type qualifier if present,
2503 * otherwise, if the type of the variable allows precision qualifiers at
2504 * all, we look for the default precision qualifier for that type in the
2507 assert(state
->es_shader
);
2509 unsigned precision
= GLSL_PRECISION_NONE
;
2510 if (qual_precision
) {
2511 precision
= qual_precision
;
2512 } else if (precision_qualifier_allowed(type
)) {
2513 const char *type_name
=
2514 get_type_name_for_precision_qualifier(type
->without_array());
2515 assert(type_name
!= NULL
);
2518 state
->symbols
->get_default_precision_qualifier(type_name
);
2519 if (precision
== ast_precision_none
) {
2520 _mesa_glsl_error(loc
, state
,
2521 "No precision specified in this scope for type `%s'",
2529 ast_fully_specified_type::glsl_type(const char **name
,
2530 struct _mesa_glsl_parse_state
*state
) const
2532 return this->specifier
->glsl_type(name
, state
);
2536 * Determine whether a toplevel variable declaration declares a varying. This
2537 * function operates by examining the variable's mode and the shader target,
2538 * so it correctly identifies linkage variables regardless of whether they are
2539 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2541 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2542 * this function will produce undefined results.
2545 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2548 case MESA_SHADER_VERTEX
:
2549 return var
->data
.mode
== ir_var_shader_out
;
2550 case MESA_SHADER_FRAGMENT
:
2551 return var
->data
.mode
== ir_var_shader_in
;
2553 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2559 * Matrix layout qualifiers are only allowed on certain types
2562 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2564 const glsl_type
*type
,
2567 if (var
&& !var
->is_in_buffer_block()) {
2568 /* Layout qualifiers may only apply to interface blocks and fields in
2571 _mesa_glsl_error(loc
, state
,
2572 "uniform block layout qualifiers row_major and "
2573 "column_major may not be applied to variables "
2574 "outside of uniform blocks");
2575 } else if (!type
->without_array()->is_matrix()) {
2576 /* The OpenGL ES 3.0 conformance tests did not originally allow
2577 * matrix layout qualifiers on non-matrices. However, the OpenGL
2578 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2579 * amended to specifically allow these layouts on all types. Emit
2580 * a warning so that people know their code may not be portable.
2582 _mesa_glsl_warning(loc
, state
,
2583 "uniform block layout qualifiers row_major and "
2584 "column_major applied to non-matrix types may "
2585 "be rejected by older compilers");
2590 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2591 struct _mesa_glsl_parse_state
*state
,
2592 unsigned xfb_buffer
) {
2593 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2594 _mesa_glsl_error(loc
, state
,
2595 "invalid xfb_buffer specified %d is larger than "
2596 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2598 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2605 /* From the ARB_enhanced_layouts spec:
2607 * "Variables and block members qualified with *xfb_offset* can be
2608 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2609 * The offset must be a multiple of the size of the first component of
2610 * the first qualified variable or block member, or a compile-time error
2611 * results. Further, if applied to an aggregate containing a double,
2612 * the offset must also be a multiple of 8, and the space taken in the
2613 * buffer will be a multiple of 8.
2616 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2617 struct _mesa_glsl_parse_state
*state
,
2618 int xfb_offset
, const glsl_type
*type
,
2619 unsigned component_size
) {
2620 const glsl_type
*t_without_array
= type
->without_array();
2622 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2623 _mesa_glsl_error(loc
, state
,
2624 "xfb_offset can't be used with unsized arrays.");
2628 /* Make sure nested structs don't contain unsized arrays, and validate
2629 * any xfb_offsets on interface members.
2631 if (t_without_array
->is_record() || t_without_array
->is_interface())
2632 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2633 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2635 /* When the interface block doesn't have an xfb_offset qualifier then
2636 * we apply the component size rules at the member level.
2638 if (xfb_offset
== -1)
2639 component_size
= member_t
->contains_double() ? 8 : 4;
2641 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2642 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2646 /* Nested structs or interface block without offset may not have had an
2647 * offset applied yet so return.
2649 if (xfb_offset
== -1) {
2653 if (xfb_offset
% component_size
) {
2654 _mesa_glsl_error(loc
, state
,
2655 "invalid qualifier xfb_offset=%d must be a multiple "
2656 "of the first component size of the first qualified "
2657 "variable or block member. Or double if an aggregate "
2658 "that contains a double (%d).",
2659 xfb_offset
, component_size
);
2667 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2670 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2671 _mesa_glsl_error(loc
, state
,
2672 "invalid stream specified %d is larger than "
2673 "MAX_VERTEX_STREAMS - 1 (%d).",
2674 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2682 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2685 const glsl_type
*type
,
2686 const ast_type_qualifier
*qual
)
2688 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2689 _mesa_glsl_error(loc
, state
,
2690 "the \"binding\" qualifier only applies to uniforms and "
2691 "shader storage buffer objects");
2695 unsigned qual_binding
;
2696 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2701 const struct gl_context
*const ctx
= state
->ctx
;
2702 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2703 unsigned max_index
= qual_binding
+ elements
- 1;
2704 const glsl_type
*base_type
= type
->without_array();
2706 if (base_type
->is_interface()) {
2707 /* UBOs. From page 60 of the GLSL 4.20 specification:
2708 * "If the binding point for any uniform block instance is less than zero,
2709 * or greater than or equal to the implementation-dependent maximum
2710 * number of uniform buffer bindings, a compilation error will occur.
2711 * When the binding identifier is used with a uniform block instanced as
2712 * an array of size N, all elements of the array from binding through
2713 * binding + N – 1 must be within this range."
2715 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2717 if (qual
->flags
.q
.uniform
&&
2718 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2719 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2720 "the maximum number of UBO binding points (%d)",
2721 qual_binding
, elements
,
2722 ctx
->Const
.MaxUniformBufferBindings
);
2726 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2727 * "If the binding point for any uniform or shader storage block instance
2728 * is less than zero, or greater than or equal to the
2729 * implementation-dependent maximum number of uniform buffer bindings, a
2730 * compile-time error will occur. When the binding identifier is used
2731 * with a uniform or shader storage block instanced as an array of size
2732 * N, all elements of the array from binding through binding + N – 1 must
2733 * be within this range."
2735 if (qual
->flags
.q
.buffer
&&
2736 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2737 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2738 "the maximum number of SSBO binding points (%d)",
2739 qual_binding
, elements
,
2740 ctx
->Const
.MaxShaderStorageBufferBindings
);
2743 } else if (base_type
->is_sampler()) {
2744 /* Samplers. From page 63 of the GLSL 4.20 specification:
2745 * "If the binding is less than zero, or greater than or equal to the
2746 * implementation-dependent maximum supported number of units, a
2747 * compilation error will occur. When the binding identifier is used
2748 * with an array of size N, all elements of the array from binding
2749 * through binding + N - 1 must be within this range."
2751 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2753 if (max_index
>= limit
) {
2754 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2755 "exceeds the maximum number of texture image units "
2756 "(%u)", qual_binding
, elements
, limit
);
2760 } else if (base_type
->contains_atomic()) {
2761 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2762 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2763 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2764 " maximum number of atomic counter buffer bindings"
2765 "(%u)", qual_binding
,
2766 ctx
->Const
.MaxAtomicBufferBindings
);
2770 } else if ((state
->is_version(420, 310) ||
2771 state
->ARB_shading_language_420pack_enable
) &&
2772 base_type
->is_image()) {
2773 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2774 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2775 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2776 " maximum number of image units (%d)", max_index
,
2777 ctx
->Const
.MaxImageUnits
);
2782 _mesa_glsl_error(loc
, state
,
2783 "the \"binding\" qualifier only applies to uniform "
2784 "blocks, opaque variables, or arrays thereof");
2788 var
->data
.explicit_binding
= true;
2789 var
->data
.binding
= qual_binding
;
2795 static glsl_interp_qualifier
2796 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2797 ir_variable_mode mode
,
2798 struct _mesa_glsl_parse_state
*state
,
2801 glsl_interp_qualifier interpolation
;
2802 if (qual
->flags
.q
.flat
)
2803 interpolation
= INTERP_QUALIFIER_FLAT
;
2804 else if (qual
->flags
.q
.noperspective
)
2805 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2806 else if (qual
->flags
.q
.smooth
)
2807 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2809 interpolation
= INTERP_QUALIFIER_NONE
;
2811 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2812 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2813 _mesa_glsl_error(loc
, state
,
2814 "interpolation qualifier `%s' can only be applied to "
2815 "shader inputs or outputs.",
2816 interpolation_string(interpolation
));
2820 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2821 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2822 _mesa_glsl_error(loc
, state
,
2823 "interpolation qualifier `%s' cannot be applied to "
2824 "vertex shader inputs or fragment shader outputs",
2825 interpolation_string(interpolation
));
2827 } else if (state
->es_shader
&&
2828 ((mode
== ir_var_shader_in
&&
2829 state
->stage
!= MESA_SHADER_VERTEX
) ||
2830 (mode
== ir_var_shader_out
&&
2831 state
->stage
!= MESA_SHADER_FRAGMENT
))) {
2832 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
2834 * "When no interpolation qualifier is present, smooth interpolation
2837 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2840 return interpolation
;
2845 apply_explicit_location(const struct ast_type_qualifier
*qual
,
2847 struct _mesa_glsl_parse_state
*state
,
2852 unsigned qual_location
;
2853 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
2858 /* Checks for GL_ARB_explicit_uniform_location. */
2859 if (qual
->flags
.q
.uniform
) {
2860 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2863 const struct gl_context
*const ctx
= state
->ctx
;
2864 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
2866 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2867 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2868 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2869 ctx
->Const
.MaxUserAssignableUniformLocations
);
2873 var
->data
.explicit_location
= true;
2874 var
->data
.location
= qual_location
;
2878 /* Between GL_ARB_explicit_attrib_location an
2879 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2880 * stage can be assigned explicit locations. The checking here associates
2881 * the correct extension with the correct stage's input / output:
2885 * vertex explicit_loc sso
2886 * tess control sso sso
2889 * fragment sso explicit_loc
2891 switch (state
->stage
) {
2892 case MESA_SHADER_VERTEX
:
2893 if (var
->data
.mode
== ir_var_shader_in
) {
2894 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2900 if (var
->data
.mode
== ir_var_shader_out
) {
2901 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2910 case MESA_SHADER_TESS_CTRL
:
2911 case MESA_SHADER_TESS_EVAL
:
2912 case MESA_SHADER_GEOMETRY
:
2913 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2914 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2923 case MESA_SHADER_FRAGMENT
:
2924 if (var
->data
.mode
== ir_var_shader_in
) {
2925 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2931 if (var
->data
.mode
== ir_var_shader_out
) {
2932 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2941 case MESA_SHADER_COMPUTE
:
2942 _mesa_glsl_error(loc
, state
,
2943 "compute shader variables cannot be given "
2944 "explicit locations");
2949 _mesa_glsl_error(loc
, state
,
2950 "%s cannot be given an explicit location in %s shader",
2952 _mesa_shader_stage_to_string(state
->stage
));
2954 var
->data
.explicit_location
= true;
2956 switch (state
->stage
) {
2957 case MESA_SHADER_VERTEX
:
2958 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2959 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
2960 : (qual_location
+ VARYING_SLOT_VAR0
);
2963 case MESA_SHADER_TESS_CTRL
:
2964 case MESA_SHADER_TESS_EVAL
:
2965 case MESA_SHADER_GEOMETRY
:
2966 if (var
->data
.patch
)
2967 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
2969 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
2972 case MESA_SHADER_FRAGMENT
:
2973 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2974 ? (qual_location
+ FRAG_RESULT_DATA0
)
2975 : (qual_location
+ VARYING_SLOT_VAR0
);
2977 case MESA_SHADER_COMPUTE
:
2978 assert(!"Unexpected shader type");
2982 /* Check if index was set for the uniform instead of the function */
2983 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
2984 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
2985 "used with subroutine functions");
2989 unsigned qual_index
;
2990 if (qual
->flags
.q
.explicit_index
&&
2991 process_qualifier_constant(state
, loc
, "index", qual
->index
,
2993 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2994 * Layout Qualifiers):
2996 * "It is also a compile-time error if a fragment shader
2997 * sets a layout index to less than 0 or greater than 1."
2999 * Older specifications don't mandate a behavior; we take
3000 * this as a clarification and always generate the error.
3002 if (qual_index
> 1) {
3003 _mesa_glsl_error(loc
, state
,
3004 "explicit index may only be 0 or 1");
3006 var
->data
.explicit_index
= true;
3007 var
->data
.index
= qual_index
;
3014 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3016 struct _mesa_glsl_parse_state
*state
,
3019 const glsl_type
*base_type
= var
->type
->without_array();
3021 if (base_type
->is_image()) {
3022 if (var
->data
.mode
!= ir_var_uniform
&&
3023 var
->data
.mode
!= ir_var_function_in
) {
3024 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3025 "function parameters or uniform-qualified "
3026 "global variables");
3029 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
3030 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
3031 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
3032 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
3033 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
3034 var
->data
.read_only
= true;
3036 if (qual
->flags
.q
.explicit_image_format
) {
3037 if (var
->data
.mode
== ir_var_function_in
) {
3038 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
3039 "used on image function parameters");
3042 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3043 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
3044 "base data type of the image");
3047 var
->data
.image_format
= qual
->image_format
;
3049 if (var
->data
.mode
== ir_var_uniform
) {
3050 if (state
->es_shader
) {
3051 _mesa_glsl_error(loc
, state
, "all image uniforms "
3052 "must have a format layout qualifier");
3054 } else if (!qual
->flags
.q
.write_only
) {
3055 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3056 "`writeonly' must have a format layout "
3061 var
->data
.image_format
= GL_NONE
;
3064 /* From page 70 of the GLSL ES 3.1 specification:
3066 * "Except for image variables qualified with the format qualifiers
3067 * r32f, r32i, and r32ui, image variables must specify either memory
3068 * qualifier readonly or the memory qualifier writeonly."
3070 if (state
->es_shader
&&
3071 var
->data
.image_format
!= GL_R32F
&&
3072 var
->data
.image_format
!= GL_R32I
&&
3073 var
->data
.image_format
!= GL_R32UI
&&
3074 !var
->data
.image_read_only
&&
3075 !var
->data
.image_write_only
) {
3076 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3077 "r32f, r32i or r32ui must be qualified `readonly' or "
3081 } else if (qual
->flags
.q
.read_only
||
3082 qual
->flags
.q
.write_only
||
3083 qual
->flags
.q
.coherent
||
3084 qual
->flags
.q
._volatile
||
3085 qual
->flags
.q
.restrict_flag
||
3086 qual
->flags
.q
.explicit_image_format
) {
3087 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3092 static inline const char*
3093 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3095 if (origin_upper_left
&& pixel_center_integer
)
3096 return "origin_upper_left, pixel_center_integer";
3097 else if (origin_upper_left
)
3098 return "origin_upper_left";
3099 else if (pixel_center_integer
)
3100 return "pixel_center_integer";
3106 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3107 const struct ast_type_qualifier
*qual
)
3109 /* If gl_FragCoord was previously declared, and the qualifiers were
3110 * different in any way, return true.
3112 if (state
->fs_redeclares_gl_fragcoord
) {
3113 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3114 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3121 validate_array_dimensions(const glsl_type
*t
,
3122 struct _mesa_glsl_parse_state
*state
,
3124 if (t
->is_array()) {
3125 t
= t
->fields
.array
;
3126 while (t
->is_array()) {
3127 if (t
->is_unsized_array()) {
3128 _mesa_glsl_error(loc
, state
,
3129 "only the outermost array dimension can "
3134 t
= t
->fields
.array
;
3140 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3142 struct _mesa_glsl_parse_state
*state
,
3145 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3147 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3149 * "Within any shader, the first redeclarations of gl_FragCoord
3150 * must appear before any use of gl_FragCoord."
3152 * Generate a compiler error if above condition is not met by the
3155 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3156 if (earlier
!= NULL
&&
3157 earlier
->data
.used
&&
3158 !state
->fs_redeclares_gl_fragcoord
) {
3159 _mesa_glsl_error(loc
, state
,
3160 "gl_FragCoord used before its first redeclaration "
3161 "in fragment shader");
3164 /* Make sure all gl_FragCoord redeclarations specify the same layout
3167 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3168 const char *const qual_string
=
3169 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3170 qual
->flags
.q
.pixel_center_integer
);
3172 const char *const state_string
=
3173 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3174 state
->fs_pixel_center_integer
);
3176 _mesa_glsl_error(loc
, state
,
3177 "gl_FragCoord redeclared with different layout "
3178 "qualifiers (%s) and (%s) ",
3182 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3183 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3184 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3185 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3186 state
->fs_redeclares_gl_fragcoord
=
3187 state
->fs_origin_upper_left
||
3188 state
->fs_pixel_center_integer
||
3189 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3192 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3193 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3194 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3195 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3196 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3197 ? "origin_upper_left" : "pixel_center_integer";
3199 _mesa_glsl_error(loc
, state
,
3200 "layout qualifier `%s' can only be applied to "
3201 "fragment shader input `gl_FragCoord'",
3205 if (qual
->flags
.q
.explicit_location
) {
3206 apply_explicit_location(qual
, var
, state
, loc
);
3207 } else if (qual
->flags
.q
.explicit_index
) {
3208 if (!qual
->flags
.q
.subroutine_def
)
3209 _mesa_glsl_error(loc
, state
,
3210 "explicit index requires explicit location");
3213 if (qual
->flags
.q
.explicit_binding
) {
3214 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3217 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3218 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3219 unsigned qual_stream
;
3220 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3222 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3223 var
->data
.stream
= qual_stream
;
3227 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3228 unsigned qual_xfb_buffer
;
3229 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3230 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3231 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3232 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3233 if (qual
->flags
.q
.explicit_xfb_buffer
)
3234 var
->data
.explicit_xfb_buffer
= true;
3238 if (qual
->flags
.q
.explicit_xfb_offset
) {
3239 unsigned qual_xfb_offset
;
3240 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3242 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3243 qual
->offset
, &qual_xfb_offset
) &&
3244 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3245 var
->type
, component_size
)) {
3246 var
->data
.offset
= qual_xfb_offset
;
3247 var
->data
.explicit_xfb_offset
= true;
3251 if (qual
->flags
.q
.explicit_xfb_stride
) {
3252 unsigned qual_xfb_stride
;
3253 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3254 qual
->xfb_stride
, &qual_xfb_stride
)) {
3255 var
->data
.xfb_stride
= qual_xfb_stride
;
3256 var
->data
.explicit_xfb_stride
= true;
3260 if (var
->type
->contains_atomic()) {
3261 if (var
->data
.mode
== ir_var_uniform
) {
3262 if (var
->data
.explicit_binding
) {
3264 &state
->atomic_counter_offsets
[var
->data
.binding
];
3266 if (*offset
% ATOMIC_COUNTER_SIZE
)
3267 _mesa_glsl_error(loc
, state
,
3268 "misaligned atomic counter offset");
3270 var
->data
.offset
= *offset
;
3271 *offset
+= var
->type
->atomic_size();
3274 _mesa_glsl_error(loc
, state
,
3275 "atomic counters require explicit binding point");
3277 } else if (var
->data
.mode
!= ir_var_function_in
) {
3278 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3279 "function parameters or uniform-qualified "
3280 "global variables");
3284 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3285 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3286 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3287 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3288 * These extensions and all following extensions that add the 'layout'
3289 * keyword have been modified to require the use of 'in' or 'out'.
3291 * The following extension do not allow the deprecated keywords:
3293 * GL_AMD_conservative_depth
3294 * GL_ARB_conservative_depth
3295 * GL_ARB_gpu_shader5
3296 * GL_ARB_separate_shader_objects
3297 * GL_ARB_tessellation_shader
3298 * GL_ARB_transform_feedback3
3299 * GL_ARB_uniform_buffer_object
3301 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3302 * allow layout with the deprecated keywords.
3304 const bool relaxed_layout_qualifier_checking
=
3305 state
->ARB_fragment_coord_conventions_enable
;
3307 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3308 || qual
->flags
.q
.varying
;
3309 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3310 if (relaxed_layout_qualifier_checking
) {
3311 _mesa_glsl_warning(loc
, state
,
3312 "`layout' qualifier may not be used with "
3313 "`attribute' or `varying'");
3315 _mesa_glsl_error(loc
, state
,
3316 "`layout' qualifier may not be used with "
3317 "`attribute' or `varying'");
3321 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3322 * AMD_conservative_depth.
3324 int depth_layout_count
= qual
->flags
.q
.depth_any
3325 + qual
->flags
.q
.depth_greater
3326 + qual
->flags
.q
.depth_less
3327 + qual
->flags
.q
.depth_unchanged
;
3328 if (depth_layout_count
> 0
3329 && !state
->is_version(420, 0)
3330 && !state
->AMD_conservative_depth_enable
3331 && !state
->ARB_conservative_depth_enable
) {
3332 _mesa_glsl_error(loc
, state
,
3333 "extension GL_AMD_conservative_depth or "
3334 "GL_ARB_conservative_depth must be enabled "
3335 "to use depth layout qualifiers");
3336 } else if (depth_layout_count
> 0
3337 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3338 _mesa_glsl_error(loc
, state
,
3339 "depth layout qualifiers can be applied only to "
3341 } else if (depth_layout_count
> 1
3342 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3343 _mesa_glsl_error(loc
, state
,
3344 "at most one depth layout qualifier can be applied to "
3347 if (qual
->flags
.q
.depth_any
)
3348 var
->data
.depth_layout
= ir_depth_layout_any
;
3349 else if (qual
->flags
.q
.depth_greater
)
3350 var
->data
.depth_layout
= ir_depth_layout_greater
;
3351 else if (qual
->flags
.q
.depth_less
)
3352 var
->data
.depth_layout
= ir_depth_layout_less
;
3353 else if (qual
->flags
.q
.depth_unchanged
)
3354 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3356 var
->data
.depth_layout
= ir_depth_layout_none
;
3358 if (qual
->flags
.q
.std140
||
3359 qual
->flags
.q
.std430
||
3360 qual
->flags
.q
.packed
||
3361 qual
->flags
.q
.shared
) {
3362 _mesa_glsl_error(loc
, state
,
3363 "uniform and shader storage block layout qualifiers "
3364 "std140, std430, packed, and shared can only be "
3365 "applied to uniform or shader storage blocks, not "
3369 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3370 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3373 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3376 * "Fragment shaders also allow the following layout qualifier on in only
3377 * (not with variable declarations)
3378 * layout-qualifier-id
3379 * early_fragment_tests
3382 if (qual
->flags
.q
.early_fragment_tests
) {
3383 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3384 "valid in fragment shader input layout declaration.");
3389 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3391 struct _mesa_glsl_parse_state
*state
,
3395 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3397 if (qual
->flags
.q
.invariant
) {
3398 if (var
->data
.used
) {
3399 _mesa_glsl_error(loc
, state
,
3400 "variable `%s' may not be redeclared "
3401 "`invariant' after being used",
3404 var
->data
.invariant
= 1;
3408 if (qual
->flags
.q
.precise
) {
3409 if (var
->data
.used
) {
3410 _mesa_glsl_error(loc
, state
,
3411 "variable `%s' may not be redeclared "
3412 "`precise' after being used",
3415 var
->data
.precise
= 1;
3419 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3420 _mesa_glsl_error(loc
, state
,
3421 "`subroutine' may only be applied to uniforms, "
3422 "subroutine type declarations, or function definitions");
3425 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3426 || qual
->flags
.q
.uniform
3427 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3428 var
->data
.read_only
= 1;
3430 if (qual
->flags
.q
.centroid
)
3431 var
->data
.centroid
= 1;
3433 if (qual
->flags
.q
.sample
)
3434 var
->data
.sample
= 1;
3436 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3437 if (state
->es_shader
) {
3438 var
->data
.precision
=
3439 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3442 if (qual
->flags
.q
.patch
)
3443 var
->data
.patch
= 1;
3445 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3446 var
->type
= glsl_type::error_type
;
3447 _mesa_glsl_error(loc
, state
,
3448 "`attribute' variables may not be declared in the "
3450 _mesa_shader_stage_to_string(state
->stage
));
3453 /* Disallow layout qualifiers which may only appear on layout declarations. */
3454 if (qual
->flags
.q
.prim_type
) {
3455 _mesa_glsl_error(loc
, state
,
3456 "Primitive type may only be specified on GS input or output "
3457 "layout declaration, not on variables.");
3460 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3462 * "However, the const qualifier cannot be used with out or inout."
3464 * The same section of the GLSL 4.40 spec further clarifies this saying:
3466 * "The const qualifier cannot be used with out or inout, or a
3467 * compile-time error results."
3469 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3470 _mesa_glsl_error(loc
, state
,
3471 "`const' may not be applied to `out' or `inout' "
3472 "function parameters");
3475 /* If there is no qualifier that changes the mode of the variable, leave
3476 * the setting alone.
3478 assert(var
->data
.mode
!= ir_var_temporary
);
3479 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3480 var
->data
.mode
= ir_var_function_inout
;
3481 else if (qual
->flags
.q
.in
)
3482 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3483 else if (qual
->flags
.q
.attribute
3484 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3485 var
->data
.mode
= ir_var_shader_in
;
3486 else if (qual
->flags
.q
.out
)
3487 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3488 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3489 var
->data
.mode
= ir_var_shader_out
;
3490 else if (qual
->flags
.q
.uniform
)
3491 var
->data
.mode
= ir_var_uniform
;
3492 else if (qual
->flags
.q
.buffer
)
3493 var
->data
.mode
= ir_var_shader_storage
;
3494 else if (qual
->flags
.q
.shared_storage
)
3495 var
->data
.mode
= ir_var_shader_shared
;
3497 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3498 /* User-defined ins/outs are not permitted in compute shaders. */
3499 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3500 _mesa_glsl_error(loc
, state
,
3501 "user-defined input and output variables are not "
3502 "permitted in compute shaders");
3505 /* This variable is being used to link data between shader stages (in
3506 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3507 * that is allowed for such purposes.
3509 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3511 * "The varying qualifier can be used only with the data types
3512 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3515 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3516 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3518 * "Fragment inputs can only be signed and unsigned integers and
3519 * integer vectors, float, floating-point vectors, matrices, or
3520 * arrays of these. Structures cannot be input.
3522 * Similar text exists in the section on vertex shader outputs.
3524 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3525 * 3.00 spec allows structs as well. Varying structs are also allowed
3528 switch (var
->type
->get_scalar_type()->base_type
) {
3529 case GLSL_TYPE_FLOAT
:
3530 /* Ok in all GLSL versions */
3532 case GLSL_TYPE_UINT
:
3534 if (state
->is_version(130, 300))
3536 _mesa_glsl_error(loc
, state
,
3537 "varying variables must be of base type float in %s",
3538 state
->get_version_string());
3540 case GLSL_TYPE_STRUCT
:
3541 if (state
->is_version(150, 300))
3543 _mesa_glsl_error(loc
, state
,
3544 "varying variables may not be of type struct");
3546 case GLSL_TYPE_DOUBLE
:
3549 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3554 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3555 switch (state
->stage
) {
3556 case MESA_SHADER_VERTEX
:
3557 if (var
->data
.mode
== ir_var_shader_out
)
3558 var
->data
.invariant
= true;
3560 case MESA_SHADER_TESS_CTRL
:
3561 case MESA_SHADER_TESS_EVAL
:
3562 case MESA_SHADER_GEOMETRY
:
3563 if ((var
->data
.mode
== ir_var_shader_in
)
3564 || (var
->data
.mode
== ir_var_shader_out
))
3565 var
->data
.invariant
= true;
3567 case MESA_SHADER_FRAGMENT
:
3568 if (var
->data
.mode
== ir_var_shader_in
)
3569 var
->data
.invariant
= true;
3571 case MESA_SHADER_COMPUTE
:
3572 /* Invariance isn't meaningful in compute shaders. */
3577 var
->data
.interpolation
=
3578 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
3581 /* Does the declaration use the deprecated 'attribute' or 'varying'
3584 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3585 || qual
->flags
.q
.varying
;
3588 /* Validate auxiliary storage qualifiers */
3590 /* From section 4.3.4 of the GLSL 1.30 spec:
3591 * "It is an error to use centroid in in a vertex shader."
3593 * From section 4.3.4 of the GLSL ES 3.00 spec:
3594 * "It is an error to use centroid in or interpolation qualifiers in
3595 * a vertex shader input."
3598 /* Section 4.3.6 of the GLSL 1.30 specification states:
3599 * "It is an error to use centroid out in a fragment shader."
3601 * The GL_ARB_shading_language_420pack extension specification states:
3602 * "It is an error to use auxiliary storage qualifiers or interpolation
3603 * qualifiers on an output in a fragment shader."
3605 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3606 _mesa_glsl_error(loc
, state
,
3607 "sample qualifier may only be used on `in` or `out` "
3608 "variables between shader stages");
3610 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3611 _mesa_glsl_error(loc
, state
,
3612 "centroid qualifier may only be used with `in', "
3613 "`out' or `varying' variables between shader stages");
3616 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3617 _mesa_glsl_error(loc
, state
,
3618 "the shared storage qualifiers can only be used with "
3622 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3626 * Get the variable that is being redeclared by this declaration
3628 * Semantic checks to verify the validity of the redeclaration are also
3629 * performed. If semantic checks fail, compilation error will be emitted via
3630 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3633 * A pointer to an existing variable in the current scope if the declaration
3634 * is a redeclaration, \c NULL otherwise.
3636 static ir_variable
*
3637 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3638 struct _mesa_glsl_parse_state
*state
,
3639 bool allow_all_redeclarations
)
3641 /* Check if this declaration is actually a re-declaration, either to
3642 * resize an array or add qualifiers to an existing variable.
3644 * This is allowed for variables in the current scope, or when at
3645 * global scope (for built-ins in the implicit outer scope).
3647 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3648 if (earlier
== NULL
||
3649 (state
->current_function
!= NULL
&&
3650 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3655 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3657 * "It is legal to declare an array without a size and then
3658 * later re-declare the same name as an array of the same
3659 * type and specify a size."
3661 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3662 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3663 /* FINISHME: This doesn't match the qualifiers on the two
3664 * FINISHME: declarations. It's not 100% clear whether this is
3665 * FINISHME: required or not.
3668 const unsigned size
= unsigned(var
->type
->array_size());
3669 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3670 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3671 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3673 earlier
->data
.max_array_access
);
3676 earlier
->type
= var
->type
;
3679 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3680 state
->is_version(150, 0))
3681 && strcmp(var
->name
, "gl_FragCoord") == 0
3682 && earlier
->type
== var
->type
3683 && var
->data
.mode
== ir_var_shader_in
) {
3684 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3687 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3688 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3690 /* According to section 4.3.7 of the GLSL 1.30 spec,
3691 * the following built-in varaibles can be redeclared with an
3692 * interpolation qualifier:
3695 * * gl_FrontSecondaryColor
3696 * * gl_BackSecondaryColor
3698 * * gl_SecondaryColor
3700 } else if (state
->is_version(130, 0)
3701 && (strcmp(var
->name
, "gl_FrontColor") == 0
3702 || strcmp(var
->name
, "gl_BackColor") == 0
3703 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3704 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3705 || strcmp(var
->name
, "gl_Color") == 0
3706 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3707 && earlier
->type
== var
->type
3708 && earlier
->data
.mode
== var
->data
.mode
) {
3709 earlier
->data
.interpolation
= var
->data
.interpolation
;
3711 /* Layout qualifiers for gl_FragDepth. */
3712 } else if ((state
->is_version(420, 0) ||
3713 state
->AMD_conservative_depth_enable
||
3714 state
->ARB_conservative_depth_enable
)
3715 && strcmp(var
->name
, "gl_FragDepth") == 0
3716 && earlier
->type
== var
->type
3717 && earlier
->data
.mode
== var
->data
.mode
) {
3719 /** From the AMD_conservative_depth spec:
3720 * Within any shader, the first redeclarations of gl_FragDepth
3721 * must appear before any use of gl_FragDepth.
3723 if (earlier
->data
.used
) {
3724 _mesa_glsl_error(&loc
, state
,
3725 "the first redeclaration of gl_FragDepth "
3726 "must appear before any use of gl_FragDepth");
3729 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3730 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3731 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3732 _mesa_glsl_error(&loc
, state
,
3733 "gl_FragDepth: depth layout is declared here "
3734 "as '%s, but it was previously declared as "
3736 depth_layout_string(var
->data
.depth_layout
),
3737 depth_layout_string(earlier
->data
.depth_layout
));
3740 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3742 } else if (allow_all_redeclarations
) {
3743 if (earlier
->data
.mode
!= var
->data
.mode
) {
3744 _mesa_glsl_error(&loc
, state
,
3745 "redeclaration of `%s' with incorrect qualifiers",
3747 } else if (earlier
->type
!= var
->type
) {
3748 _mesa_glsl_error(&loc
, state
,
3749 "redeclaration of `%s' has incorrect type",
3753 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3760 * Generate the IR for an initializer in a variable declaration
3763 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3764 ast_fully_specified_type
*type
,
3765 exec_list
*initializer_instructions
,
3766 struct _mesa_glsl_parse_state
*state
)
3768 ir_rvalue
*result
= NULL
;
3770 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3772 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3774 * "All uniform variables are read-only and are initialized either
3775 * directly by an application via API commands, or indirectly by
3778 if (var
->data
.mode
== ir_var_uniform
) {
3779 state
->check_version(120, 0, &initializer_loc
,
3780 "cannot initialize uniform %s",
3784 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3786 * "Buffer variables cannot have initializers."
3788 if (var
->data
.mode
== ir_var_shader_storage
) {
3789 _mesa_glsl_error(&initializer_loc
, state
,
3790 "cannot initialize buffer variable %s",
3794 /* From section 4.1.7 of the GLSL 4.40 spec:
3796 * "Opaque variables [...] are initialized only through the
3797 * OpenGL API; they cannot be declared with an initializer in a
3800 if (var
->type
->contains_opaque()) {
3801 _mesa_glsl_error(&initializer_loc
, state
,
3802 "cannot initialize opaque variable %s",
3806 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3807 _mesa_glsl_error(&initializer_loc
, state
,
3808 "cannot initialize %s shader input / %s %s",
3809 _mesa_shader_stage_to_string(state
->stage
),
3810 (state
->stage
== MESA_SHADER_VERTEX
)
3811 ? "attribute" : "varying",
3815 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3816 _mesa_glsl_error(&initializer_loc
, state
,
3817 "cannot initialize %s shader output %s",
3818 _mesa_shader_stage_to_string(state
->stage
),
3822 /* If the initializer is an ast_aggregate_initializer, recursively store
3823 * type information from the LHS into it, so that its hir() function can do
3826 if (decl
->initializer
->oper
== ast_aggregate
)
3827 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3829 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3830 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3832 /* Calculate the constant value if this is a const or uniform
3835 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
3837 * "Declarations of globals without a storage qualifier, or with
3838 * just the const qualifier, may include initializers, in which case
3839 * they will be initialized before the first line of main() is
3840 * executed. Such initializers must be a constant expression."
3842 * The same section of the GLSL ES 3.00.4 spec has similar language.
3844 if (type
->qualifier
.flags
.q
.constant
3845 || type
->qualifier
.flags
.q
.uniform
3846 || (state
->es_shader
&& state
->current_function
== NULL
)) {
3847 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3849 if (new_rhs
!= NULL
) {
3852 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
3855 * "A constant expression is one of
3859 * - an expression formed by an operator on operands that are
3860 * all constant expressions, including getting an element of
3861 * a constant array, or a field of a constant structure, or
3862 * components of a constant vector. However, the sequence
3863 * operator ( , ) and the assignment operators ( =, +=, ...)
3864 * are not included in the operators that can create a
3865 * constant expression."
3867 * Section 12.43 (Sequence operator and constant expressions) says:
3869 * "Should the following construct be allowed?
3873 * The expression within the brackets uses the sequence operator
3874 * (',') and returns the integer 3 so the construct is declaring
3875 * a single-dimensional array of size 3. In some languages, the
3876 * construct declares a two-dimensional array. It would be
3877 * preferable to make this construct illegal to avoid confusion.
3879 * One possibility is to change the definition of the sequence
3880 * operator so that it does not return a constant-expression and
3881 * hence cannot be used to declare an array size.
3883 * RESOLUTION: The result of a sequence operator is not a
3884 * constant-expression."
3886 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
3887 * contains language almost identical to the section 4.3.3 in the
3888 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
3891 ir_constant
*constant_value
= rhs
->constant_expression_value();
3892 if (!constant_value
||
3893 (state
->is_version(430, 300) &&
3894 decl
->initializer
->has_sequence_subexpression())) {
3895 const char *const variable_mode
=
3896 (type
->qualifier
.flags
.q
.constant
)
3898 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
3900 /* If ARB_shading_language_420pack is enabled, initializers of
3901 * const-qualified local variables do not have to be constant
3902 * expressions. Const-qualified global variables must still be
3903 * initialized with constant expressions.
3905 if (!state
->has_420pack()
3906 || state
->current_function
== NULL
) {
3907 _mesa_glsl_error(& initializer_loc
, state
,
3908 "initializer of %s variable `%s' must be a "
3909 "constant expression",
3912 if (var
->type
->is_numeric()) {
3913 /* Reduce cascading errors. */
3914 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3915 ? ir_constant::zero(state
, var
->type
) : NULL
;
3919 rhs
= constant_value
;
3920 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3921 ? constant_value
: NULL
;
3924 if (var
->type
->is_numeric()) {
3925 /* Reduce cascading errors. */
3926 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3927 ? ir_constant::zero(state
, var
->type
) : NULL
;
3932 if (rhs
&& !rhs
->type
->is_error()) {
3933 bool temp
= var
->data
.read_only
;
3934 if (type
->qualifier
.flags
.q
.constant
)
3935 var
->data
.read_only
= false;
3937 /* Never emit code to initialize a uniform.
3939 const glsl_type
*initializer_type
;
3940 if (!type
->qualifier
.flags
.q
.uniform
) {
3941 do_assignment(initializer_instructions
, state
,
3946 type
->get_location());
3947 initializer_type
= result
->type
;
3949 initializer_type
= rhs
->type
;
3951 var
->constant_initializer
= rhs
->constant_expression_value();
3952 var
->data
.has_initializer
= true;
3954 /* If the declared variable is an unsized array, it must inherrit
3955 * its full type from the initializer. A declaration such as
3957 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3961 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3963 * The assignment generated in the if-statement (below) will also
3964 * automatically handle this case for non-uniforms.
3966 * If the declared variable is not an array, the types must
3967 * already match exactly. As a result, the type assignment
3968 * here can be done unconditionally. For non-uniforms the call
3969 * to do_assignment can change the type of the initializer (via
3970 * the implicit conversion rules). For uniforms the initializer
3971 * must be a constant expression, and the type of that expression
3972 * was validated above.
3974 var
->type
= initializer_type
;
3976 var
->data
.read_only
= temp
;
3983 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3984 YYLTYPE loc
, ir_variable
*var
,
3985 unsigned num_vertices
,
3987 const char *var_category
)
3989 if (var
->type
->is_unsized_array()) {
3990 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3992 * All geometry shader input unsized array declarations will be
3993 * sized by an earlier input layout qualifier, when present, as per
3994 * the following table.
3996 * Followed by a table mapping each allowed input layout qualifier to
3997 * the corresponding input length.
3999 * Similarly for tessellation control shader outputs.
4001 if (num_vertices
!= 0)
4002 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4005 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4006 * includes the following examples of compile-time errors:
4008 * // code sequence within one shader...
4009 * in vec4 Color1[]; // size unknown
4010 * ...Color1.length()...// illegal, length() unknown
4011 * in vec4 Color2[2]; // size is 2
4012 * ...Color1.length()...// illegal, Color1 still has no size
4013 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4014 * layout(lines) in; // legal, input size is 2, matching
4015 * in vec4 Color4[3]; // illegal, contradicts layout
4018 * To detect the case illustrated by Color3, we verify that the size of
4019 * an explicitly-sized array matches the size of any previously declared
4020 * explicitly-sized array. To detect the case illustrated by Color4, we
4021 * verify that the size of an explicitly-sized array is consistent with
4022 * any previously declared input layout.
4024 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4025 _mesa_glsl_error(&loc
, state
,
4026 "%s size contradicts previously declared layout "
4027 "(size is %u, but layout requires a size of %u)",
4028 var_category
, var
->type
->length
, num_vertices
);
4029 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4030 _mesa_glsl_error(&loc
, state
,
4031 "%s sizes are inconsistent (size is %u, but a "
4032 "previous declaration has size %u)",
4033 var_category
, var
->type
->length
, *size
);
4035 *size
= var
->type
->length
;
4041 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4042 YYLTYPE loc
, ir_variable
*var
)
4044 unsigned num_vertices
= 0;
4046 if (state
->tcs_output_vertices_specified
) {
4047 if (!state
->out_qualifier
->vertices
->
4048 process_qualifier_constant(state
, "vertices",
4049 &num_vertices
, false)) {
4053 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4054 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4055 "GL_MAX_PATCH_VERTICES", num_vertices
);
4060 if (!var
->type
->is_array() && !var
->data
.patch
) {
4061 _mesa_glsl_error(&loc
, state
,
4062 "tessellation control shader outputs must be arrays");
4064 /* To avoid cascading failures, short circuit the checks below. */
4068 if (var
->data
.patch
)
4071 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4072 &state
->tcs_output_size
,
4073 "tessellation control shader output");
4077 * Do additional processing necessary for tessellation control/evaluation shader
4078 * input declarations. This covers both interface block arrays and bare input
4082 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4083 YYLTYPE loc
, ir_variable
*var
)
4085 if (!var
->type
->is_array() && !var
->data
.patch
) {
4086 _mesa_glsl_error(&loc
, state
,
4087 "per-vertex tessellation shader inputs must be arrays");
4088 /* Avoid cascading failures. */
4092 if (var
->data
.patch
)
4095 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
4096 if (var
->type
->is_unsized_array()) {
4097 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4098 state
->Const
.MaxPatchVertices
);
4104 * Do additional processing necessary for geometry shader input declarations
4105 * (this covers both interface blocks arrays and bare input variables).
4108 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4109 YYLTYPE loc
, ir_variable
*var
)
4111 unsigned num_vertices
= 0;
4113 if (state
->gs_input_prim_type_specified
) {
4114 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4117 /* Geometry shader input variables must be arrays. Caller should have
4118 * reported an error for this.
4120 if (!var
->type
->is_array()) {
4121 assert(state
->error
);
4123 /* To avoid cascading failures, short circuit the checks below. */
4127 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4128 &state
->gs_input_size
,
4129 "geometry shader input");
4133 validate_identifier(const char *identifier
, YYLTYPE loc
,
4134 struct _mesa_glsl_parse_state
*state
)
4136 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4138 * "Identifiers starting with "gl_" are reserved for use by
4139 * OpenGL, and may not be declared in a shader as either a
4140 * variable or a function."
4142 if (is_gl_identifier(identifier
)) {
4143 _mesa_glsl_error(&loc
, state
,
4144 "identifier `%s' uses reserved `gl_' prefix",
4146 } else if (strstr(identifier
, "__")) {
4147 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4150 * "In addition, all identifiers containing two
4151 * consecutive underscores (__) are reserved as
4152 * possible future keywords."
4154 * The intention is that names containing __ are reserved for internal
4155 * use by the implementation, and names prefixed with GL_ are reserved
4156 * for use by Khronos. Names simply containing __ are dangerous to use,
4157 * but should be allowed.
4159 * A future version of the GLSL specification will clarify this.
4161 _mesa_glsl_warning(&loc
, state
,
4162 "identifier `%s' uses reserved `__' string",
4168 ast_declarator_list::hir(exec_list
*instructions
,
4169 struct _mesa_glsl_parse_state
*state
)
4172 const struct glsl_type
*decl_type
;
4173 const char *type_name
= NULL
;
4174 ir_rvalue
*result
= NULL
;
4175 YYLTYPE loc
= this->get_location();
4177 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4179 * "To ensure that a particular output variable is invariant, it is
4180 * necessary to use the invariant qualifier. It can either be used to
4181 * qualify a previously declared variable as being invariant
4183 * invariant gl_Position; // make existing gl_Position be invariant"
4185 * In these cases the parser will set the 'invariant' flag in the declarator
4186 * list, and the type will be NULL.
4188 if (this->invariant
) {
4189 assert(this->type
== NULL
);
4191 if (state
->current_function
!= NULL
) {
4192 _mesa_glsl_error(& loc
, state
,
4193 "all uses of `invariant' keyword must be at global "
4197 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4198 assert(decl
->array_specifier
== NULL
);
4199 assert(decl
->initializer
== NULL
);
4201 ir_variable
*const earlier
=
4202 state
->symbols
->get_variable(decl
->identifier
);
4203 if (earlier
== NULL
) {
4204 _mesa_glsl_error(& loc
, state
,
4205 "undeclared variable `%s' cannot be marked "
4206 "invariant", decl
->identifier
);
4207 } else if (!is_varying_var(earlier
, state
->stage
)) {
4208 _mesa_glsl_error(&loc
, state
,
4209 "`%s' cannot be marked invariant; interfaces between "
4210 "shader stages only.", decl
->identifier
);
4211 } else if (earlier
->data
.used
) {
4212 _mesa_glsl_error(& loc
, state
,
4213 "variable `%s' may not be redeclared "
4214 "`invariant' after being used",
4217 earlier
->data
.invariant
= true;
4221 /* Invariant redeclarations do not have r-values.
4226 if (this->precise
) {
4227 assert(this->type
== NULL
);
4229 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4230 assert(decl
->array_specifier
== NULL
);
4231 assert(decl
->initializer
== NULL
);
4233 ir_variable
*const earlier
=
4234 state
->symbols
->get_variable(decl
->identifier
);
4235 if (earlier
== NULL
) {
4236 _mesa_glsl_error(& loc
, state
,
4237 "undeclared variable `%s' cannot be marked "
4238 "precise", decl
->identifier
);
4239 } else if (state
->current_function
!= NULL
&&
4240 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4241 /* Note: we have to check if we're in a function, since
4242 * builtins are treated as having come from another scope.
4244 _mesa_glsl_error(& loc
, state
,
4245 "variable `%s' from an outer scope may not be "
4246 "redeclared `precise' in this scope",
4248 } else if (earlier
->data
.used
) {
4249 _mesa_glsl_error(& loc
, state
,
4250 "variable `%s' may not be redeclared "
4251 "`precise' after being used",
4254 earlier
->data
.precise
= true;
4258 /* Precise redeclarations do not have r-values either. */
4262 assert(this->type
!= NULL
);
4263 assert(!this->invariant
);
4264 assert(!this->precise
);
4266 /* The type specifier may contain a structure definition. Process that
4267 * before any of the variable declarations.
4269 (void) this->type
->specifier
->hir(instructions
, state
);
4271 decl_type
= this->type
->glsl_type(& type_name
, state
);
4273 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4274 * "Buffer variables may only be declared inside interface blocks
4275 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4276 * shader storage blocks. It is a compile-time error to declare buffer
4277 * variables at global scope (outside a block)."
4279 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4280 _mesa_glsl_error(&loc
, state
,
4281 "buffer variables cannot be declared outside "
4282 "interface blocks");
4285 /* An offset-qualified atomic counter declaration sets the default
4286 * offset for the next declaration within the same atomic counter
4289 if (decl_type
&& decl_type
->contains_atomic()) {
4290 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4291 type
->qualifier
.flags
.q
.explicit_offset
) {
4292 unsigned qual_binding
;
4293 unsigned qual_offset
;
4294 if (process_qualifier_constant(state
, &loc
, "binding",
4295 type
->qualifier
.binding
,
4297 && process_qualifier_constant(state
, &loc
, "offset",
4298 type
->qualifier
.offset
,
4300 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4305 if (this->declarations
.is_empty()) {
4306 /* If there is no structure involved in the program text, there are two
4307 * possible scenarios:
4309 * - The program text contained something like 'vec4;'. This is an
4310 * empty declaration. It is valid but weird. Emit a warning.
4312 * - The program text contained something like 'S;' and 'S' is not the
4313 * name of a known structure type. This is both invalid and weird.
4316 * - The program text contained something like 'mediump float;'
4317 * when the programmer probably meant 'precision mediump
4318 * float;' Emit a warning with a description of what they
4319 * probably meant to do.
4321 * Note that if decl_type is NULL and there is a structure involved,
4322 * there must have been some sort of error with the structure. In this
4323 * case we assume that an error was already generated on this line of
4324 * code for the structure. There is no need to generate an additional,
4327 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4330 if (decl_type
== NULL
) {
4331 _mesa_glsl_error(&loc
, state
,
4332 "invalid type `%s' in empty declaration",
4335 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4336 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4339 * "... any declaration that leaves the size undefined is
4340 * disallowed as this would add complexity and there are no
4343 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4344 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4345 "or implicitly defined");
4348 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4350 * "The combinations of types and qualifiers that cause
4351 * compile-time or link-time errors are the same whether or not
4352 * the declaration is empty."
4354 validate_array_dimensions(decl_type
, state
, &loc
);
4357 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4358 /* Empty atomic counter declarations are allowed and useful
4359 * to set the default offset qualifier.
4362 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4363 if (this->type
->specifier
->structure
!= NULL
) {
4364 _mesa_glsl_error(&loc
, state
,
4365 "precision qualifiers can't be applied "
4368 static const char *const precision_names
[] = {
4375 _mesa_glsl_warning(&loc
, state
,
4376 "empty declaration with precision "
4377 "qualifier, to set the default precision, "
4378 "use `precision %s %s;'",
4379 precision_names
[this->type
->
4380 qualifier
.precision
],
4383 } else if (this->type
->specifier
->structure
== NULL
) {
4384 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4389 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4390 const struct glsl_type
*var_type
;
4392 const char *identifier
= decl
->identifier
;
4393 /* FINISHME: Emit a warning if a variable declaration shadows a
4394 * FINISHME: declaration at a higher scope.
4397 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4398 if (type_name
!= NULL
) {
4399 _mesa_glsl_error(& loc
, state
,
4400 "invalid type `%s' in declaration of `%s'",
4401 type_name
, decl
->identifier
);
4403 _mesa_glsl_error(& loc
, state
,
4404 "invalid type in declaration of `%s'",
4410 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4414 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4416 _mesa_glsl_error(& loc
, state
,
4417 "invalid type in declaration of `%s'",
4419 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4424 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4427 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4429 /* The 'varying in' and 'varying out' qualifiers can only be used with
4430 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4433 if (this->type
->qualifier
.flags
.q
.varying
) {
4434 if (this->type
->qualifier
.flags
.q
.in
) {
4435 _mesa_glsl_error(& loc
, state
,
4436 "`varying in' qualifier in declaration of "
4437 "`%s' only valid for geometry shaders using "
4438 "ARB_geometry_shader4 or EXT_geometry_shader4",
4440 } else if (this->type
->qualifier
.flags
.q
.out
) {
4441 _mesa_glsl_error(& loc
, state
,
4442 "`varying out' qualifier in declaration of "
4443 "`%s' only valid for geometry shaders using "
4444 "ARB_geometry_shader4 or EXT_geometry_shader4",
4449 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4451 * "Global variables can only use the qualifiers const,
4452 * attribute, uniform, or varying. Only one may be
4455 * Local variables can only use the qualifier const."
4457 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4458 * any extension that adds the 'layout' keyword.
4460 if (!state
->is_version(130, 300)
4461 && !state
->has_explicit_attrib_location()
4462 && !state
->has_separate_shader_objects()
4463 && !state
->ARB_fragment_coord_conventions_enable
) {
4464 if (this->type
->qualifier
.flags
.q
.out
) {
4465 _mesa_glsl_error(& loc
, state
,
4466 "`out' qualifier in declaration of `%s' "
4467 "only valid for function parameters in %s",
4468 decl
->identifier
, state
->get_version_string());
4470 if (this->type
->qualifier
.flags
.q
.in
) {
4471 _mesa_glsl_error(& loc
, state
,
4472 "`in' qualifier in declaration of `%s' "
4473 "only valid for function parameters in %s",
4474 decl
->identifier
, state
->get_version_string());
4476 /* FINISHME: Test for other invalid qualifiers. */
4479 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4481 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4484 if (this->type
->qualifier
.flags
.q
.invariant
) {
4485 if (!is_varying_var(var
, state
->stage
)) {
4486 _mesa_glsl_error(&loc
, state
,
4487 "`%s' cannot be marked invariant; interfaces between "
4488 "shader stages only", var
->name
);
4492 if (state
->current_function
!= NULL
) {
4493 const char *mode
= NULL
;
4494 const char *extra
= "";
4496 /* There is no need to check for 'inout' here because the parser will
4497 * only allow that in function parameter lists.
4499 if (this->type
->qualifier
.flags
.q
.attribute
) {
4501 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4502 mode
= "subroutine uniform";
4503 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4505 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4507 } else if (this->type
->qualifier
.flags
.q
.in
) {
4509 extra
= " or in function parameter list";
4510 } else if (this->type
->qualifier
.flags
.q
.out
) {
4512 extra
= " or in function parameter list";
4516 _mesa_glsl_error(& loc
, state
,
4517 "%s variable `%s' must be declared at "
4519 mode
, var
->name
, extra
);
4521 } else if (var
->data
.mode
== ir_var_shader_in
) {
4522 var
->data
.read_only
= true;
4524 if (state
->stage
== MESA_SHADER_VERTEX
) {
4525 bool error_emitted
= false;
4527 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4529 * "Vertex shader inputs can only be float, floating-point
4530 * vectors, matrices, signed and unsigned integers and integer
4531 * vectors. Vertex shader inputs can also form arrays of these
4532 * types, but not structures."
4534 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4536 * "Vertex shader inputs can only be float, floating-point
4537 * vectors, matrices, signed and unsigned integers and integer
4538 * vectors. They cannot be arrays or structures."
4540 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4542 * "The attribute qualifier can be used only with float,
4543 * floating-point vectors, and matrices. Attribute variables
4544 * cannot be declared as arrays or structures."
4546 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4548 * "Vertex shader inputs can only be float, floating-point
4549 * vectors, matrices, signed and unsigned integers and integer
4550 * vectors. Vertex shader inputs cannot be arrays or
4553 const glsl_type
*check_type
= var
->type
->without_array();
4555 switch (check_type
->base_type
) {
4556 case GLSL_TYPE_FLOAT
:
4558 case GLSL_TYPE_UINT
:
4560 if (state
->is_version(120, 300))
4562 case GLSL_TYPE_DOUBLE
:
4563 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4567 _mesa_glsl_error(& loc
, state
,
4568 "vertex shader input / attribute cannot have "
4570 var
->type
->is_array() ? "array of " : "",
4572 error_emitted
= true;
4575 if (!error_emitted
&& var
->type
->is_array() &&
4576 !state
->check_version(150, 0, &loc
,
4577 "vertex shader input / attribute "
4578 "cannot have array type")) {
4579 error_emitted
= true;
4581 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4582 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4584 * Geometry shader input variables get the per-vertex values
4585 * written out by vertex shader output variables of the same
4586 * names. Since a geometry shader operates on a set of
4587 * vertices, each input varying variable (or input block, see
4588 * interface blocks below) needs to be declared as an array.
4590 if (!var
->type
->is_array()) {
4591 _mesa_glsl_error(&loc
, state
,
4592 "geometry shader inputs must be arrays");
4595 handle_geometry_shader_input_decl(state
, loc
, var
);
4596 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4597 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4599 * It is a compile-time error to declare a fragment shader
4600 * input with, or that contains, any of the following types:
4604 * * An array of arrays
4605 * * An array of structures
4606 * * A structure containing an array
4607 * * A structure containing a structure
4609 if (state
->es_shader
) {
4610 const glsl_type
*check_type
= var
->type
->without_array();
4611 if (check_type
->is_boolean() ||
4612 check_type
->contains_opaque()) {
4613 _mesa_glsl_error(&loc
, state
,
4614 "fragment shader input cannot have type %s",
4617 if (var
->type
->is_array() &&
4618 var
->type
->fields
.array
->is_array()) {
4619 _mesa_glsl_error(&loc
, state
,
4621 "cannot have an array of arrays",
4622 _mesa_shader_stage_to_string(state
->stage
));
4624 if (var
->type
->is_array() &&
4625 var
->type
->fields
.array
->is_record()) {
4626 _mesa_glsl_error(&loc
, state
,
4627 "fragment shader input "
4628 "cannot have an array of structs");
4630 if (var
->type
->is_record()) {
4631 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4632 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4633 var
->type
->fields
.structure
[i
].type
->is_record())
4634 _mesa_glsl_error(&loc
, state
,
4635 "fragement shader input cannot have "
4636 "a struct that contains an "
4641 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4642 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4643 handle_tess_shader_input_decl(state
, loc
, var
);
4645 } else if (var
->data
.mode
== ir_var_shader_out
) {
4646 const glsl_type
*check_type
= var
->type
->without_array();
4648 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4650 * It is a compile-time error to declare a vertex, tessellation
4651 * evaluation, tessellation control, or geometry shader output
4652 * that contains any of the following:
4654 * * A Boolean type (bool, bvec2 ...)
4657 if (check_type
->is_boolean() || check_type
->contains_opaque())
4658 _mesa_glsl_error(&loc
, state
,
4659 "%s shader output cannot have type %s",
4660 _mesa_shader_stage_to_string(state
->stage
),
4663 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4665 * It is a compile-time error to declare a fragment shader output
4666 * that contains any of the following:
4668 * * A Boolean type (bool, bvec2 ...)
4669 * * A double-precision scalar or vector (double, dvec2 ...)
4674 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4675 if (check_type
->is_record() || check_type
->is_matrix())
4676 _mesa_glsl_error(&loc
, state
,
4677 "fragment shader output "
4678 "cannot have struct or matrix type");
4679 switch (check_type
->base_type
) {
4680 case GLSL_TYPE_UINT
:
4682 case GLSL_TYPE_FLOAT
:
4685 _mesa_glsl_error(&loc
, state
,
4686 "fragment shader output cannot have "
4687 "type %s", check_type
->name
);
4691 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4693 * It is a compile-time error to declare a vertex shader output
4694 * with, or that contains, any of the following types:
4698 * * An array of arrays
4699 * * An array of structures
4700 * * A structure containing an array
4701 * * A structure containing a structure
4703 * It is a compile-time error to declare a fragment shader output
4704 * with, or that contains, any of the following types:
4710 * * An array of array
4712 if (state
->es_shader
) {
4713 if (var
->type
->is_array() &&
4714 var
->type
->fields
.array
->is_array()) {
4715 _mesa_glsl_error(&loc
, state
,
4717 "cannot have an array of arrays",
4718 _mesa_shader_stage_to_string(state
->stage
));
4720 if (state
->stage
== MESA_SHADER_VERTEX
) {
4721 if (var
->type
->is_array() &&
4722 var
->type
->fields
.array
->is_record()) {
4723 _mesa_glsl_error(&loc
, state
,
4724 "vertex shader output "
4725 "cannot have an array of structs");
4727 if (var
->type
->is_record()) {
4728 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4729 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4730 var
->type
->fields
.structure
[i
].type
->is_record())
4731 _mesa_glsl_error(&loc
, state
,
4732 "vertex shader output cannot have a "
4733 "struct that contains an "
4740 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4741 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4743 } else if (var
->type
->contains_subroutine()) {
4744 /* declare subroutine uniforms as hidden */
4745 var
->data
.how_declared
= ir_var_hidden
;
4748 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4749 * so must integer vertex outputs.
4751 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4752 * "Fragment shader inputs that are signed or unsigned integers or
4753 * integer vectors must be qualified with the interpolation qualifier
4756 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4757 * "Fragment shader inputs that are, or contain, signed or unsigned
4758 * integers or integer vectors must be qualified with the
4759 * interpolation qualifier flat."
4761 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4762 * "Vertex shader outputs that are, or contain, signed or unsigned
4763 * integers or integer vectors must be qualified with the
4764 * interpolation qualifier flat."
4766 * Note that prior to GLSL 1.50, this requirement applied to vertex
4767 * outputs rather than fragment inputs. That creates problems in the
4768 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4769 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4770 * apply the restriction to both vertex outputs and fragment inputs.
4772 * Note also that the desktop GLSL specs are missing the text "or
4773 * contain"; this is presumably an oversight, since there is no
4774 * reasonable way to interpolate a fragment shader input that contains
4777 if (state
->is_version(130, 300) &&
4778 var
->type
->contains_integer() &&
4779 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4780 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4781 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4782 && state
->es_shader
))) {
4783 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4784 "vertex output" : "fragment input";
4785 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4786 "an integer, then it must be qualified with 'flat'",
4790 /* Double fragment inputs must be qualified with 'flat'. */
4791 if (var
->type
->contains_double() &&
4792 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4793 state
->stage
== MESA_SHADER_FRAGMENT
&&
4794 var
->data
.mode
== ir_var_shader_in
) {
4795 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4796 "a double, then it must be qualified with 'flat'",
4800 /* Interpolation qualifiers cannot be applied to 'centroid' and
4801 * 'centroid varying'.
4803 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4804 * "interpolation qualifiers may only precede the qualifiers in,
4805 * centroid in, out, or centroid out in a declaration. They do not apply
4806 * to the deprecated storage qualifiers varying or centroid varying."
4808 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4810 if (state
->is_version(130, 0)
4811 && this->type
->qualifier
.has_interpolation()
4812 && this->type
->qualifier
.flags
.q
.varying
) {
4814 const char *i
= interpolation_string(var
->data
.interpolation
);
4816 if (this->type
->qualifier
.flags
.q
.centroid
)
4817 s
= "centroid varying";
4821 _mesa_glsl_error(&loc
, state
,
4822 "qualifier '%s' cannot be applied to the "
4823 "deprecated storage qualifier '%s'", i
, s
);
4827 /* Interpolation qualifiers can only apply to vertex shader outputs and
4828 * fragment shader inputs.
4830 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4831 * "Outputs from a vertex shader (out) and inputs to a fragment
4832 * shader (in) can be further qualified with one or more of these
4833 * interpolation qualifiers"
4835 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4836 * "These interpolation qualifiers may only precede the qualifiers
4837 * in, centroid in, out, or centroid out in a declaration. They do
4838 * not apply to inputs into a vertex shader or outputs from a
4841 if (state
->is_version(130, 300)
4842 && this->type
->qualifier
.has_interpolation()) {
4844 const char *i
= interpolation_string(var
->data
.interpolation
);
4845 switch (state
->stage
) {
4846 case MESA_SHADER_VERTEX
:
4847 if (this->type
->qualifier
.flags
.q
.in
) {
4848 _mesa_glsl_error(&loc
, state
,
4849 "qualifier '%s' cannot be applied to vertex "
4850 "shader inputs", i
);
4853 case MESA_SHADER_FRAGMENT
:
4854 if (this->type
->qualifier
.flags
.q
.out
) {
4855 _mesa_glsl_error(&loc
, state
,
4856 "qualifier '%s' cannot be applied to fragment "
4857 "shader outputs", i
);
4866 /* From section 4.3.4 of the GLSL 4.00 spec:
4867 * "Input variables may not be declared using the patch in qualifier
4868 * in tessellation control or geometry shaders."
4870 * From section 4.3.6 of the GLSL 4.00 spec:
4871 * "It is an error to use patch out in a vertex, tessellation
4872 * evaluation, or geometry shader."
4874 * This doesn't explicitly forbid using them in a fragment shader, but
4875 * that's probably just an oversight.
4877 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4878 && this->type
->qualifier
.flags
.q
.patch
4879 && this->type
->qualifier
.flags
.q
.in
) {
4881 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4882 "tessellation evaluation shader");
4885 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4886 && this->type
->qualifier
.flags
.q
.patch
4887 && this->type
->qualifier
.flags
.q
.out
) {
4889 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4890 "tessellation control shader");
4893 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4895 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4896 state
->check_precision_qualifiers_allowed(&loc
);
4900 /* If a precision qualifier is allowed on a type, it is allowed on
4901 * an array of that type.
4903 if (!(this->type
->qualifier
.precision
== ast_precision_none
4904 || precision_qualifier_allowed(var
->type
->without_array()))) {
4906 _mesa_glsl_error(&loc
, state
,
4907 "precision qualifiers apply only to floating point"
4908 ", integer and opaque types");
4911 /* From section 4.1.7 of the GLSL 4.40 spec:
4913 * "[Opaque types] can only be declared as function
4914 * parameters or uniform-qualified variables."
4916 if (var_type
->contains_opaque() &&
4917 !this->type
->qualifier
.flags
.q
.uniform
) {
4918 _mesa_glsl_error(&loc
, state
,
4919 "opaque variables must be declared uniform");
4922 /* Process the initializer and add its instructions to a temporary
4923 * list. This list will be added to the instruction stream (below) after
4924 * the declaration is added. This is done because in some cases (such as
4925 * redeclarations) the declaration may not actually be added to the
4926 * instruction stream.
4928 exec_list initializer_instructions
;
4930 /* Examine var name here since var may get deleted in the next call */
4931 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4933 ir_variable
*earlier
=
4934 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4935 false /* allow_all_redeclarations */);
4936 if (earlier
!= NULL
) {
4938 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4939 _mesa_glsl_error(&loc
, state
,
4940 "`%s' has already been redeclared using "
4941 "gl_PerVertex", earlier
->name
);
4943 earlier
->data
.how_declared
= ir_var_declared_normally
;
4946 if (decl
->initializer
!= NULL
) {
4947 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4949 &initializer_instructions
, state
);
4951 validate_array_dimensions(var_type
, state
, &loc
);
4954 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4956 * "It is an error to write to a const variable outside of
4957 * its declaration, so they must be initialized when
4960 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4961 _mesa_glsl_error(& loc
, state
,
4962 "const declaration of `%s' must be initialized",
4966 if (state
->es_shader
) {
4967 const glsl_type
*const t
= (earlier
== NULL
)
4968 ? var
->type
: earlier
->type
;
4970 if (t
->is_unsized_array())
4971 /* Section 10.17 of the GLSL ES 1.00 specification states that
4972 * unsized array declarations have been removed from the language.
4973 * Arrays that are sized using an initializer are still explicitly
4974 * sized. However, GLSL ES 1.00 does not allow array
4975 * initializers. That is only allowed in GLSL ES 3.00.
4977 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4979 * "An array type can also be formed without specifying a size
4980 * if the definition includes an initializer:
4982 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4983 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4988 _mesa_glsl_error(& loc
, state
,
4989 "unsized array declarations are not allowed in "
4993 /* If the declaration is not a redeclaration, there are a few additional
4994 * semantic checks that must be applied. In addition, variable that was
4995 * created for the declaration should be added to the IR stream.
4997 if (earlier
== NULL
) {
4998 validate_identifier(decl
->identifier
, loc
, state
);
5000 /* Add the variable to the symbol table. Note that the initializer's
5001 * IR was already processed earlier (though it hasn't been emitted
5002 * yet), without the variable in scope.
5004 * This differs from most C-like languages, but it follows the GLSL
5005 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5008 * "Within a declaration, the scope of a name starts immediately
5009 * after the initializer if present or immediately after the name
5010 * being declared if not."
5012 if (!state
->symbols
->add_variable(var
)) {
5013 YYLTYPE loc
= this->get_location();
5014 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5015 "current scope", decl
->identifier
);
5019 /* Push the variable declaration to the top. It means that all the
5020 * variable declarations will appear in a funny last-to-first order,
5021 * but otherwise we run into trouble if a function is prototyped, a
5022 * global var is decled, then the function is defined with usage of
5023 * the global var. See glslparsertest's CorrectModule.frag.
5025 instructions
->push_head(var
);
5028 instructions
->append_list(&initializer_instructions
);
5032 /* Generally, variable declarations do not have r-values. However,
5033 * one is used for the declaration in
5035 * while (bool b = some_condition()) {
5039 * so we return the rvalue from the last seen declaration here.
5046 ast_parameter_declarator::hir(exec_list
*instructions
,
5047 struct _mesa_glsl_parse_state
*state
)
5050 const struct glsl_type
*type
;
5051 const char *name
= NULL
;
5052 YYLTYPE loc
= this->get_location();
5054 type
= this->type
->glsl_type(& name
, state
);
5058 _mesa_glsl_error(& loc
, state
,
5059 "invalid type `%s' in declaration of `%s'",
5060 name
, this->identifier
);
5062 _mesa_glsl_error(& loc
, state
,
5063 "invalid type in declaration of `%s'",
5067 type
= glsl_type::error_type
;
5070 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5072 * "Functions that accept no input arguments need not use void in the
5073 * argument list because prototypes (or definitions) are required and
5074 * therefore there is no ambiguity when an empty argument list "( )" is
5075 * declared. The idiom "(void)" as a parameter list is provided for
5078 * Placing this check here prevents a void parameter being set up
5079 * for a function, which avoids tripping up checks for main taking
5080 * parameters and lookups of an unnamed symbol.
5082 if (type
->is_void()) {
5083 if (this->identifier
!= NULL
)
5084 _mesa_glsl_error(& loc
, state
,
5085 "named parameter cannot have type `void'");
5091 if (formal_parameter
&& (this->identifier
== NULL
)) {
5092 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5096 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5097 * call already handled the "vec4[..] foo" case.
5099 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5101 if (!type
->is_error() && type
->is_unsized_array()) {
5102 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5104 type
= glsl_type::error_type
;
5108 ir_variable
*var
= new(ctx
)
5109 ir_variable(type
, this->identifier
, ir_var_function_in
);
5111 /* Apply any specified qualifiers to the parameter declaration. Note that
5112 * for function parameters the default mode is 'in'.
5114 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5117 /* From section 4.1.7 of the GLSL 4.40 spec:
5119 * "Opaque variables cannot be treated as l-values; hence cannot
5120 * be used as out or inout function parameters, nor can they be
5123 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5124 && type
->contains_opaque()) {
5125 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5126 "contain opaque variables");
5127 type
= glsl_type::error_type
;
5130 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5132 * "When calling a function, expressions that do not evaluate to
5133 * l-values cannot be passed to parameters declared as out or inout."
5135 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5137 * "Other binary or unary expressions, non-dereferenced arrays,
5138 * function names, swizzles with repeated fields, and constants
5139 * cannot be l-values."
5141 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5142 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5144 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5146 && !state
->check_version(120, 100, &loc
,
5147 "arrays cannot be out or inout parameters")) {
5148 type
= glsl_type::error_type
;
5151 instructions
->push_tail(var
);
5153 /* Parameter declarations do not have r-values.
5160 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5162 exec_list
*ir_parameters
,
5163 _mesa_glsl_parse_state
*state
)
5165 ast_parameter_declarator
*void_param
= NULL
;
5168 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5169 param
->formal_parameter
= formal
;
5170 param
->hir(ir_parameters
, state
);
5178 if ((void_param
!= NULL
) && (count
> 1)) {
5179 YYLTYPE loc
= void_param
->get_location();
5181 _mesa_glsl_error(& loc
, state
,
5182 "`void' parameter must be only parameter");
5188 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5190 /* IR invariants disallow function declarations or definitions
5191 * nested within other function definitions. But there is no
5192 * requirement about the relative order of function declarations
5193 * and definitions with respect to one another. So simply insert
5194 * the new ir_function block at the end of the toplevel instruction
5197 state
->toplevel_ir
->push_tail(f
);
5202 ast_function::hir(exec_list
*instructions
,
5203 struct _mesa_glsl_parse_state
*state
)
5206 ir_function
*f
= NULL
;
5207 ir_function_signature
*sig
= NULL
;
5208 exec_list hir_parameters
;
5209 YYLTYPE loc
= this->get_location();
5211 const char *const name
= identifier
;
5213 /* New functions are always added to the top-level IR instruction stream,
5214 * so this instruction list pointer is ignored. See also emit_function
5217 (void) instructions
;
5219 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5221 * "Function declarations (prototypes) cannot occur inside of functions;
5222 * they must be at global scope, or for the built-in functions, outside
5223 * the global scope."
5225 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5227 * "User defined functions may only be defined within the global scope."
5229 * Note that this language does not appear in GLSL 1.10.
5231 if ((state
->current_function
!= NULL
) &&
5232 state
->is_version(120, 100)) {
5233 YYLTYPE loc
= this->get_location();
5234 _mesa_glsl_error(&loc
, state
,
5235 "declaration of function `%s' not allowed within "
5236 "function body", name
);
5239 validate_identifier(name
, this->get_location(), state
);
5241 /* Convert the list of function parameters to HIR now so that they can be
5242 * used below to compare this function's signature with previously seen
5243 * signatures for functions with the same name.
5245 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5247 & hir_parameters
, state
);
5249 const char *return_type_name
;
5250 const glsl_type
*return_type
=
5251 this->return_type
->glsl_type(& return_type_name
, state
);
5254 YYLTYPE loc
= this->get_location();
5255 _mesa_glsl_error(&loc
, state
,
5256 "function `%s' has undeclared return type `%s'",
5257 name
, return_type_name
);
5258 return_type
= glsl_type::error_type
;
5261 /* ARB_shader_subroutine states:
5262 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5263 * subroutine(...) to a function declaration."
5265 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5266 YYLTYPE loc
= this->get_location();
5267 _mesa_glsl_error(&loc
, state
,
5268 "function declaration `%s' cannot have subroutine prepended",
5272 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5273 * "No qualifier is allowed on the return type of a function."
5275 if (this->return_type
->has_qualifiers(state
)) {
5276 YYLTYPE loc
= this->get_location();
5277 _mesa_glsl_error(& loc
, state
,
5278 "function `%s' return type has qualifiers", name
);
5281 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5283 * "Arrays are allowed as arguments and as the return type. In both
5284 * cases, the array must be explicitly sized."
5286 if (return_type
->is_unsized_array()) {
5287 YYLTYPE loc
= this->get_location();
5288 _mesa_glsl_error(& loc
, state
,
5289 "function `%s' return type array must be explicitly "
5293 /* From section 4.1.7 of the GLSL 4.40 spec:
5295 * "[Opaque types] can only be declared as function parameters
5296 * or uniform-qualified variables."
5298 if (return_type
->contains_opaque()) {
5299 YYLTYPE loc
= this->get_location();
5300 _mesa_glsl_error(&loc
, state
,
5301 "function `%s' return type can't contain an opaque type",
5305 /* Create an ir_function if one doesn't already exist. */
5306 f
= state
->symbols
->get_function(name
);
5308 f
= new(ctx
) ir_function(name
);
5309 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5310 if (!state
->symbols
->add_function(f
)) {
5311 /* This function name shadows a non-function use of the same name. */
5312 YYLTYPE loc
= this->get_location();
5313 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5314 "non-function", name
);
5318 emit_function(state
, f
);
5321 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5323 * "A shader cannot redefine or overload built-in functions."
5325 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5327 * "User code can overload the built-in functions but cannot redefine
5330 if (state
->es_shader
&& state
->language_version
>= 300) {
5331 /* Local shader has no exact candidates; check the built-ins. */
5332 _mesa_glsl_initialize_builtin_functions();
5333 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5334 YYLTYPE loc
= this->get_location();
5335 _mesa_glsl_error(& loc
, state
,
5336 "A shader cannot redefine or overload built-in "
5337 "function `%s' in GLSL ES 3.00", name
);
5342 /* Verify that this function's signature either doesn't match a previously
5343 * seen signature for a function with the same name, or, if a match is found,
5344 * that the previously seen signature does not have an associated definition.
5346 if (state
->es_shader
|| f
->has_user_signature()) {
5347 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5349 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5350 if (badvar
!= NULL
) {
5351 YYLTYPE loc
= this->get_location();
5353 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5354 "qualifiers don't match prototype", name
, badvar
);
5357 if (sig
->return_type
!= return_type
) {
5358 YYLTYPE loc
= this->get_location();
5360 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5361 "match prototype", name
);
5364 if (sig
->is_defined
) {
5365 if (is_definition
) {
5366 YYLTYPE loc
= this->get_location();
5367 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5369 /* We just encountered a prototype that exactly matches a
5370 * function that's already been defined. This is redundant,
5371 * and we should ignore it.
5379 /* Verify the return type of main() */
5380 if (strcmp(name
, "main") == 0) {
5381 if (! return_type
->is_void()) {
5382 YYLTYPE loc
= this->get_location();
5384 _mesa_glsl_error(& loc
, state
, "main() must return void");
5387 if (!hir_parameters
.is_empty()) {
5388 YYLTYPE loc
= this->get_location();
5390 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5394 /* Finish storing the information about this new function in its signature.
5397 sig
= new(ctx
) ir_function_signature(return_type
);
5398 f
->add_signature(sig
);
5401 sig
->replace_parameters(&hir_parameters
);
5404 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5407 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5408 unsigned qual_index
;
5409 if (process_qualifier_constant(state
, &loc
, "index",
5410 this->return_type
->qualifier
.index
,
5412 if (!state
->has_explicit_uniform_location()) {
5413 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5414 "GL_ARB_explicit_uniform_location or "
5416 } else if (qual_index
>= MAX_SUBROUTINES
) {
5417 _mesa_glsl_error(&loc
, state
,
5418 "invalid subroutine index (%d) index must "
5419 "be a number between 0 and "
5420 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5421 MAX_SUBROUTINES
- 1);
5423 f
->subroutine_index
= qual_index
;
5428 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5429 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5430 f
->num_subroutine_types
);
5432 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5433 const struct glsl_type
*type
;
5434 /* the subroutine type must be already declared */
5435 type
= state
->symbols
->get_type(decl
->identifier
);
5437 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5439 f
->subroutine_types
[idx
++] = type
;
5441 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5443 state
->num_subroutines
+ 1);
5444 state
->subroutines
[state
->num_subroutines
] = f
;
5445 state
->num_subroutines
++;
5449 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5450 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5451 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5454 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5456 state
->num_subroutine_types
+ 1);
5457 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5458 state
->num_subroutine_types
++;
5460 f
->is_subroutine
= true;
5463 /* Function declarations (prototypes) do not have r-values.
5470 ast_function_definition::hir(exec_list
*instructions
,
5471 struct _mesa_glsl_parse_state
*state
)
5473 prototype
->is_definition
= true;
5474 prototype
->hir(instructions
, state
);
5476 ir_function_signature
*signature
= prototype
->signature
;
5477 if (signature
== NULL
)
5480 assert(state
->current_function
== NULL
);
5481 state
->current_function
= signature
;
5482 state
->found_return
= false;
5484 /* Duplicate parameters declared in the prototype as concrete variables.
5485 * Add these to the symbol table.
5487 state
->symbols
->push_scope();
5488 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5489 assert(var
->as_variable() != NULL
);
5491 /* The only way a parameter would "exist" is if two parameters have
5494 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5495 YYLTYPE loc
= this->get_location();
5497 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5499 state
->symbols
->add_variable(var
);
5503 /* Convert the body of the function to HIR. */
5504 this->body
->hir(&signature
->body
, state
);
5505 signature
->is_defined
= true;
5507 state
->symbols
->pop_scope();
5509 assert(state
->current_function
== signature
);
5510 state
->current_function
= NULL
;
5512 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5513 YYLTYPE loc
= this->get_location();
5514 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5515 "%s, but no return statement",
5516 signature
->function_name(),
5517 signature
->return_type
->name
);
5520 /* Function definitions do not have r-values.
5527 ast_jump_statement::hir(exec_list
*instructions
,
5528 struct _mesa_glsl_parse_state
*state
)
5535 assert(state
->current_function
);
5537 if (opt_return_value
) {
5538 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5540 /* The value of the return type can be NULL if the shader says
5541 * 'return foo();' and foo() is a function that returns void.
5543 * NOTE: The GLSL spec doesn't say that this is an error. The type
5544 * of the return value is void. If the return type of the function is
5545 * also void, then this should compile without error. Seriously.
5547 const glsl_type
*const ret_type
=
5548 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5550 /* Implicit conversions are not allowed for return values prior to
5551 * ARB_shading_language_420pack.
5553 if (state
->current_function
->return_type
!= ret_type
) {
5554 YYLTYPE loc
= this->get_location();
5556 if (state
->has_420pack()) {
5557 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5559 _mesa_glsl_error(& loc
, state
,
5560 "could not implicitly convert return value "
5561 "to %s, in function `%s'",
5562 state
->current_function
->return_type
->name
,
5563 state
->current_function
->function_name());
5566 _mesa_glsl_error(& loc
, state
,
5567 "`return' with wrong type %s, in function `%s' "
5570 state
->current_function
->function_name(),
5571 state
->current_function
->return_type
->name
);
5573 } else if (state
->current_function
->return_type
->base_type
==
5575 YYLTYPE loc
= this->get_location();
5577 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5578 * specs add a clarification:
5580 * "A void function can only use return without a return argument, even if
5581 * the return argument has void type. Return statements only accept values:
5584 * void func2() { return func1(); } // illegal return statement"
5586 _mesa_glsl_error(& loc
, state
,
5587 "void functions can only use `return' without a "
5591 inst
= new(ctx
) ir_return(ret
);
5593 if (state
->current_function
->return_type
->base_type
!=
5595 YYLTYPE loc
= this->get_location();
5597 _mesa_glsl_error(& loc
, state
,
5598 "`return' with no value, in function %s returning "
5600 state
->current_function
->function_name());
5602 inst
= new(ctx
) ir_return
;
5605 state
->found_return
= true;
5606 instructions
->push_tail(inst
);
5611 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5612 YYLTYPE loc
= this->get_location();
5614 _mesa_glsl_error(& loc
, state
,
5615 "`discard' may only appear in a fragment shader");
5617 instructions
->push_tail(new(ctx
) ir_discard
);
5622 if (mode
== ast_continue
&&
5623 state
->loop_nesting_ast
== NULL
) {
5624 YYLTYPE loc
= this->get_location();
5626 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5627 } else if (mode
== ast_break
&&
5628 state
->loop_nesting_ast
== NULL
&&
5629 state
->switch_state
.switch_nesting_ast
== NULL
) {
5630 YYLTYPE loc
= this->get_location();
5632 _mesa_glsl_error(& loc
, state
,
5633 "break may only appear in a loop or a switch");
5635 /* For a loop, inline the for loop expression again, since we don't
5636 * know where near the end of the loop body the normal copy of it is
5637 * going to be placed. Same goes for the condition for a do-while
5640 if (state
->loop_nesting_ast
!= NULL
&&
5641 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5642 if (state
->loop_nesting_ast
->rest_expression
) {
5643 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5646 if (state
->loop_nesting_ast
->mode
==
5647 ast_iteration_statement::ast_do_while
) {
5648 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5652 if (state
->switch_state
.is_switch_innermost
&&
5653 mode
== ast_continue
) {
5654 /* Set 'continue_inside' to true. */
5655 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5656 ir_dereference_variable
*deref_continue_inside_var
=
5657 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5658 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5661 /* Break out from the switch, continue for the loop will
5662 * be called right after switch. */
5663 ir_loop_jump
*const jump
=
5664 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5665 instructions
->push_tail(jump
);
5667 } else if (state
->switch_state
.is_switch_innermost
&&
5668 mode
== ast_break
) {
5669 /* Force break out of switch by inserting a break. */
5670 ir_loop_jump
*const jump
=
5671 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5672 instructions
->push_tail(jump
);
5674 ir_loop_jump
*const jump
=
5675 new(ctx
) ir_loop_jump((mode
== ast_break
)
5676 ? ir_loop_jump::jump_break
5677 : ir_loop_jump::jump_continue
);
5678 instructions
->push_tail(jump
);
5685 /* Jump instructions do not have r-values.
5692 ast_selection_statement::hir(exec_list
*instructions
,
5693 struct _mesa_glsl_parse_state
*state
)
5697 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5699 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5701 * "Any expression whose type evaluates to a Boolean can be used as the
5702 * conditional expression bool-expression. Vector types are not accepted
5703 * as the expression to if."
5705 * The checks are separated so that higher quality diagnostics can be
5706 * generated for cases where both rules are violated.
5708 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5709 YYLTYPE loc
= this->condition
->get_location();
5711 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5715 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5717 if (then_statement
!= NULL
) {
5718 state
->symbols
->push_scope();
5719 then_statement
->hir(& stmt
->then_instructions
, state
);
5720 state
->symbols
->pop_scope();
5723 if (else_statement
!= NULL
) {
5724 state
->symbols
->push_scope();
5725 else_statement
->hir(& stmt
->else_instructions
, state
);
5726 state
->symbols
->pop_scope();
5729 instructions
->push_tail(stmt
);
5731 /* if-statements do not have r-values.
5738 ast_switch_statement::hir(exec_list
*instructions
,
5739 struct _mesa_glsl_parse_state
*state
)
5743 ir_rvalue
*const test_expression
=
5744 this->test_expression
->hir(instructions
, state
);
5746 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5748 * "The type of init-expression in a switch statement must be a
5751 if (!test_expression
->type
->is_scalar() ||
5752 !test_expression
->type
->is_integer()) {
5753 YYLTYPE loc
= this->test_expression
->get_location();
5755 _mesa_glsl_error(& loc
,
5757 "switch-statement expression must be scalar "
5761 /* Track the switch-statement nesting in a stack-like manner.
5763 struct glsl_switch_state saved
= state
->switch_state
;
5765 state
->switch_state
.is_switch_innermost
= true;
5766 state
->switch_state
.switch_nesting_ast
= this;
5767 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5768 hash_table_pointer_compare
);
5769 state
->switch_state
.previous_default
= NULL
;
5771 /* Initalize is_fallthru state to false.
5773 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5774 state
->switch_state
.is_fallthru_var
=
5775 new(ctx
) ir_variable(glsl_type::bool_type
,
5776 "switch_is_fallthru_tmp",
5778 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5780 ir_dereference_variable
*deref_is_fallthru_var
=
5781 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5782 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5785 /* Initialize continue_inside state to false.
5787 state
->switch_state
.continue_inside
=
5788 new(ctx
) ir_variable(glsl_type::bool_type
,
5789 "continue_inside_tmp",
5791 instructions
->push_tail(state
->switch_state
.continue_inside
);
5793 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5794 ir_dereference_variable
*deref_continue_inside_var
=
5795 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5796 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5799 state
->switch_state
.run_default
=
5800 new(ctx
) ir_variable(glsl_type::bool_type
,
5803 instructions
->push_tail(state
->switch_state
.run_default
);
5805 /* Loop around the switch is used for flow control. */
5806 ir_loop
* loop
= new(ctx
) ir_loop();
5807 instructions
->push_tail(loop
);
5809 /* Cache test expression.
5811 test_to_hir(&loop
->body_instructions
, state
);
5813 /* Emit code for body of switch stmt.
5815 body
->hir(&loop
->body_instructions
, state
);
5817 /* Insert a break at the end to exit loop. */
5818 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5819 loop
->body_instructions
.push_tail(jump
);
5821 /* If we are inside loop, check if continue got called inside switch. */
5822 if (state
->loop_nesting_ast
!= NULL
) {
5823 ir_dereference_variable
*deref_continue_inside
=
5824 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5825 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5826 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5828 if (state
->loop_nesting_ast
!= NULL
) {
5829 if (state
->loop_nesting_ast
->rest_expression
) {
5830 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5833 if (state
->loop_nesting_ast
->mode
==
5834 ast_iteration_statement::ast_do_while
) {
5835 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5838 irif
->then_instructions
.push_tail(jump
);
5839 instructions
->push_tail(irif
);
5842 hash_table_dtor(state
->switch_state
.labels_ht
);
5844 state
->switch_state
= saved
;
5846 /* Switch statements do not have r-values. */
5852 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5853 struct _mesa_glsl_parse_state
*state
)
5857 /* set to true to avoid a duplicate "use of uninitialized variable" warning
5858 * on the switch test case. The first one would be already raised when
5859 * getting the test_expression at ast_switch_statement::hir
5861 test_expression
->set_is_lhs(true);
5862 /* Cache value of test expression. */
5863 ir_rvalue
*const test_val
=
5864 test_expression
->hir(instructions
,
5867 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5870 ir_dereference_variable
*deref_test_var
=
5871 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5873 instructions
->push_tail(state
->switch_state
.test_var
);
5874 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5879 ast_switch_body::hir(exec_list
*instructions
,
5880 struct _mesa_glsl_parse_state
*state
)
5883 stmts
->hir(instructions
, state
);
5885 /* Switch bodies do not have r-values. */
5890 ast_case_statement_list::hir(exec_list
*instructions
,
5891 struct _mesa_glsl_parse_state
*state
)
5893 exec_list default_case
, after_default
, tmp
;
5895 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5896 case_stmt
->hir(&tmp
, state
);
5899 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5900 default_case
.append_list(&tmp
);
5904 /* If default case found, append 'after_default' list. */
5905 if (!default_case
.is_empty())
5906 after_default
.append_list(&tmp
);
5908 instructions
->append_list(&tmp
);
5911 /* Handle the default case. This is done here because default might not be
5912 * the last case. We need to add checks against following cases first to see
5913 * if default should be chosen or not.
5915 if (!default_case
.is_empty()) {
5917 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5918 ir_dereference_variable
*deref_run_default_var
=
5919 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5921 /* Choose to run default case initially, following conditional
5922 * assignments might change this.
5924 ir_assignment
*const init_var
=
5925 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5926 instructions
->push_tail(init_var
);
5928 /* Default case was the last one, no checks required. */
5929 if (after_default
.is_empty()) {
5930 instructions
->append_list(&default_case
);
5934 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5935 ir_assignment
*assign
= ir
->as_assignment();
5940 /* Clone the check between case label and init expression. */
5941 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5942 ir_expression
*clone
= exp
->clone(state
, NULL
);
5944 ir_dereference_variable
*deref_var
=
5945 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5946 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5948 ir_assignment
*const set_false
=
5949 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5951 instructions
->push_tail(set_false
);
5954 /* Append default case and all cases after it. */
5955 instructions
->append_list(&default_case
);
5956 instructions
->append_list(&after_default
);
5959 /* Case statements do not have r-values. */
5964 ast_case_statement::hir(exec_list
*instructions
,
5965 struct _mesa_glsl_parse_state
*state
)
5967 labels
->hir(instructions
, state
);
5969 /* Guard case statements depending on fallthru state. */
5970 ir_dereference_variable
*const deref_fallthru_guard
=
5971 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5972 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5974 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5975 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5977 instructions
->push_tail(test_fallthru
);
5979 /* Case statements do not have r-values. */
5985 ast_case_label_list::hir(exec_list
*instructions
,
5986 struct _mesa_glsl_parse_state
*state
)
5988 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5989 label
->hir(instructions
, state
);
5991 /* Case labels do not have r-values. */
5996 ast_case_label::hir(exec_list
*instructions
,
5997 struct _mesa_glsl_parse_state
*state
)
6001 ir_dereference_variable
*deref_fallthru_var
=
6002 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6004 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6006 /* If not default case, ... */
6007 if (this->test_value
!= NULL
) {
6008 /* Conditionally set fallthru state based on
6009 * comparison of cached test expression value to case label.
6011 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6012 ir_constant
*label_const
= label_rval
->constant_expression_value();
6015 YYLTYPE loc
= this->test_value
->get_location();
6017 _mesa_glsl_error(& loc
, state
,
6018 "switch statement case label must be a "
6019 "constant expression");
6021 /* Stuff a dummy value in to allow processing to continue. */
6022 label_const
= new(ctx
) ir_constant(0);
6024 ast_expression
*previous_label
= (ast_expression
*)
6025 hash_table_find(state
->switch_state
.labels_ht
,
6026 (void *)(uintptr_t)label_const
->value
.u
[0]);
6028 if (previous_label
) {
6029 YYLTYPE loc
= this->test_value
->get_location();
6030 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6032 loc
= previous_label
->get_location();
6033 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6035 hash_table_insert(state
->switch_state
.labels_ht
,
6037 (void *)(uintptr_t)label_const
->value
.u
[0]);
6041 ir_dereference_variable
*deref_test_var
=
6042 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6044 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6049 * From GLSL 4.40 specification section 6.2 ("Selection"):
6051 * "The type of the init-expression value in a switch statement must
6052 * be a scalar int or uint. The type of the constant-expression value
6053 * in a case label also must be a scalar int or uint. When any pair
6054 * of these values is tested for "equal value" and the types do not
6055 * match, an implicit conversion will be done to convert the int to a
6056 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6059 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6060 YYLTYPE loc
= this->test_value
->get_location();
6062 const glsl_type
*type_a
= label_const
->type
;
6063 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6065 /* Check if int->uint implicit conversion is supported. */
6066 bool integer_conversion_supported
=
6067 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6070 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6071 !integer_conversion_supported
) {
6072 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6073 "init-expression and case label (%s != %s)",
6074 type_a
->name
, type_b
->name
);
6076 /* Conversion of the case label. */
6077 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6078 if (!apply_implicit_conversion(glsl_type::uint_type
,
6079 test_cond
->operands
[0], state
))
6080 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6082 /* Conversion of the init-expression value. */
6083 if (!apply_implicit_conversion(glsl_type::uint_type
,
6084 test_cond
->operands
[1], state
))
6085 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6090 ir_assignment
*set_fallthru_on_test
=
6091 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6093 instructions
->push_tail(set_fallthru_on_test
);
6094 } else { /* default case */
6095 if (state
->switch_state
.previous_default
) {
6096 YYLTYPE loc
= this->get_location();
6097 _mesa_glsl_error(& loc
, state
,
6098 "multiple default labels in one switch");
6100 loc
= state
->switch_state
.previous_default
->get_location();
6101 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6103 state
->switch_state
.previous_default
= this;
6105 /* Set fallthru condition on 'run_default' bool. */
6106 ir_dereference_variable
*deref_run_default
=
6107 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6108 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6109 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6113 /* Set falltrhu state. */
6114 ir_assignment
*set_fallthru
=
6115 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6117 instructions
->push_tail(set_fallthru
);
6120 /* Case statements do not have r-values. */
6125 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6126 struct _mesa_glsl_parse_state
*state
)
6130 if (condition
!= NULL
) {
6131 ir_rvalue
*const cond
=
6132 condition
->hir(instructions
, state
);
6135 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6136 YYLTYPE loc
= condition
->get_location();
6138 _mesa_glsl_error(& loc
, state
,
6139 "loop condition must be scalar boolean");
6141 /* As the first code in the loop body, generate a block that looks
6142 * like 'if (!condition) break;' as the loop termination condition.
6144 ir_rvalue
*const not_cond
=
6145 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6147 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6149 ir_jump
*const break_stmt
=
6150 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6152 if_stmt
->then_instructions
.push_tail(break_stmt
);
6153 instructions
->push_tail(if_stmt
);
6160 ast_iteration_statement::hir(exec_list
*instructions
,
6161 struct _mesa_glsl_parse_state
*state
)
6165 /* For-loops and while-loops start a new scope, but do-while loops do not.
6167 if (mode
!= ast_do_while
)
6168 state
->symbols
->push_scope();
6170 if (init_statement
!= NULL
)
6171 init_statement
->hir(instructions
, state
);
6173 ir_loop
*const stmt
= new(ctx
) ir_loop();
6174 instructions
->push_tail(stmt
);
6176 /* Track the current loop nesting. */
6177 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6179 state
->loop_nesting_ast
= this;
6181 /* Likewise, indicate that following code is closest to a loop,
6182 * NOT closest to a switch.
6184 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6185 state
->switch_state
.is_switch_innermost
= false;
6187 if (mode
!= ast_do_while
)
6188 condition_to_hir(&stmt
->body_instructions
, state
);
6191 body
->hir(& stmt
->body_instructions
, state
);
6193 if (rest_expression
!= NULL
)
6194 rest_expression
->hir(& stmt
->body_instructions
, state
);
6196 if (mode
== ast_do_while
)
6197 condition_to_hir(&stmt
->body_instructions
, state
);
6199 if (mode
!= ast_do_while
)
6200 state
->symbols
->pop_scope();
6202 /* Restore previous nesting before returning. */
6203 state
->loop_nesting_ast
= nesting_ast
;
6204 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6206 /* Loops do not have r-values.
6213 * Determine if the given type is valid for establishing a default precision
6216 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6218 * "The precision statement
6220 * precision precision-qualifier type;
6222 * can be used to establish a default precision qualifier. The type field
6223 * can be either int or float or any of the sampler types, and the
6224 * precision-qualifier can be lowp, mediump, or highp."
6226 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6227 * qualifiers on sampler types, but this seems like an oversight (since the
6228 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6229 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6233 is_valid_default_precision_type(const struct glsl_type
*const type
)
6238 switch (type
->base_type
) {
6240 case GLSL_TYPE_FLOAT
:
6241 /* "int" and "float" are valid, but vectors and matrices are not. */
6242 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6243 case GLSL_TYPE_SAMPLER
:
6244 case GLSL_TYPE_IMAGE
:
6245 case GLSL_TYPE_ATOMIC_UINT
:
6254 ast_type_specifier::hir(exec_list
*instructions
,
6255 struct _mesa_glsl_parse_state
*state
)
6257 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6260 YYLTYPE loc
= this->get_location();
6262 /* If this is a precision statement, check that the type to which it is
6263 * applied is either float or int.
6265 * From section 4.5.3 of the GLSL 1.30 spec:
6266 * "The precision statement
6267 * precision precision-qualifier type;
6268 * can be used to establish a default precision qualifier. The type
6269 * field can be either int or float [...]. Any other types or
6270 * qualifiers will result in an error.
6272 if (this->default_precision
!= ast_precision_none
) {
6273 if (!state
->check_precision_qualifiers_allowed(&loc
))
6276 if (this->structure
!= NULL
) {
6277 _mesa_glsl_error(&loc
, state
,
6278 "precision qualifiers do not apply to structures");
6282 if (this->array_specifier
!= NULL
) {
6283 _mesa_glsl_error(&loc
, state
,
6284 "default precision statements do not apply to "
6289 const struct glsl_type
*const type
=
6290 state
->symbols
->get_type(this->type_name
);
6291 if (!is_valid_default_precision_type(type
)) {
6292 _mesa_glsl_error(&loc
, state
,
6293 "default precision statements apply only to "
6294 "float, int, and opaque types");
6298 if (state
->es_shader
) {
6299 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6302 * "Non-precision qualified declarations will use the precision
6303 * qualifier specified in the most recent precision statement
6304 * that is still in scope. The precision statement has the same
6305 * scoping rules as variable declarations. If it is declared
6306 * inside a compound statement, its effect stops at the end of
6307 * the innermost statement it was declared in. Precision
6308 * statements in nested scopes override precision statements in
6309 * outer scopes. Multiple precision statements for the same basic
6310 * type can appear inside the same scope, with later statements
6311 * overriding earlier statements within that scope."
6313 * Default precision specifications follow the same scope rules as
6314 * variables. So, we can track the state of the default precision
6315 * qualifiers in the symbol table, and the rules will just work. This
6316 * is a slight abuse of the symbol table, but it has the semantics
6319 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6320 this->default_precision
);
6323 /* FINISHME: Translate precision statements into IR. */
6327 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6328 * process_record_constructor() can do type-checking on C-style initializer
6329 * expressions of structs, but ast_struct_specifier should only be translated
6330 * to HIR if it is declaring the type of a structure.
6332 * The ->is_declaration field is false for initializers of variables
6333 * declared separately from the struct's type definition.
6335 * struct S { ... }; (is_declaration = true)
6336 * struct T { ... } t = { ... }; (is_declaration = true)
6337 * S s = { ... }; (is_declaration = false)
6339 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6340 return this->structure
->hir(instructions
, state
);
6347 * Process a structure or interface block tree into an array of structure fields
6349 * After parsing, where there are some syntax differnces, structures and
6350 * interface blocks are almost identical. They are similar enough that the
6351 * AST for each can be processed the same way into a set of
6352 * \c glsl_struct_field to describe the members.
6354 * If we're processing an interface block, var_mode should be the type of the
6355 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6356 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6360 * The number of fields processed. A pointer to the array structure fields is
6361 * stored in \c *fields_ret.
6364 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6365 struct _mesa_glsl_parse_state
*state
,
6366 exec_list
*declarations
,
6367 glsl_struct_field
**fields_ret
,
6369 enum glsl_matrix_layout matrix_layout
,
6370 bool allow_reserved_names
,
6371 ir_variable_mode var_mode
,
6372 ast_type_qualifier
*layout
,
6373 unsigned block_stream
,
6374 unsigned block_xfb_buffer
,
6375 unsigned block_xfb_offset
,
6376 unsigned expl_location
,
6377 unsigned expl_align
)
6379 unsigned decl_count
= 0;
6380 unsigned next_offset
= 0;
6382 /* Make an initial pass over the list of fields to determine how
6383 * many there are. Each element in this list is an ast_declarator_list.
6384 * This means that we actually need to count the number of elements in the
6385 * 'declarations' list in each of the elements.
6387 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6388 decl_count
+= decl_list
->declarations
.length();
6391 /* Allocate storage for the fields and process the field
6392 * declarations. As the declarations are processed, try to also convert
6393 * the types to HIR. This ensures that structure definitions embedded in
6394 * other structure definitions or in interface blocks are processed.
6396 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6399 bool first_member
= true;
6400 bool first_member_has_explicit_location
= false;
6403 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6404 const char *type_name
;
6405 YYLTYPE loc
= decl_list
->get_location();
6407 decl_list
->type
->specifier
->hir(instructions
, state
);
6409 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6411 * "Anonymous structures are not supported; so embedded structures
6412 * must have a declarator. A name given to an embedded struct is
6413 * scoped at the same level as the struct it is embedded in."
6415 * The same section of the GLSL 1.20 spec says:
6417 * "Anonymous structures are not supported. Embedded structures are
6420 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6421 * embedded structures in 1.10 only.
6423 if (state
->language_version
!= 110 &&
6424 decl_list
->type
->specifier
->structure
!= NULL
)
6425 _mesa_glsl_error(&loc
, state
,
6426 "embedded structure declarations are not allowed");
6428 const glsl_type
*decl_type
=
6429 decl_list
->type
->glsl_type(& type_name
, state
);
6431 const struct ast_type_qualifier
*const qual
=
6432 &decl_list
->type
->qualifier
;
6434 /* From section 4.3.9 of the GLSL 4.40 spec:
6436 * "[In interface blocks] opaque types are not allowed."
6438 * It should be impossible for decl_type to be NULL here. Cases that
6439 * might naturally lead to decl_type being NULL, especially for the
6440 * is_interface case, will have resulted in compilation having
6441 * already halted due to a syntax error.
6446 if (decl_type
->contains_opaque()) {
6447 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6448 "interface block contains opaque variable");
6451 if (decl_type
->contains_atomic()) {
6452 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6454 * "Members of structures cannot be declared as atomic counter
6457 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6460 if (decl_type
->contains_image()) {
6461 /* FINISHME: Same problem as with atomic counters.
6462 * FINISHME: Request clarification from Khronos and add
6463 * FINISHME: spec quotation here.
6465 _mesa_glsl_error(&loc
, state
, "image in structure");
6469 if (qual
->flags
.q
.explicit_binding
) {
6470 _mesa_glsl_error(&loc
, state
,
6471 "binding layout qualifier cannot be applied "
6472 "to struct or interface block members");
6476 if (!first_member
) {
6477 if (!layout
->flags
.q
.explicit_location
&&
6478 ((first_member_has_explicit_location
&&
6479 !qual
->flags
.q
.explicit_location
) ||
6480 (!first_member_has_explicit_location
&&
6481 qual
->flags
.q
.explicit_location
))) {
6482 _mesa_glsl_error(&loc
, state
,
6483 "when block-level location layout qualifier "
6484 "is not supplied either all members must "
6485 "have a location layout qualifier or all "
6486 "members must not have a location layout "
6490 first_member
= false;
6491 first_member_has_explicit_location
=
6492 qual
->flags
.q
.explicit_location
;
6496 if (qual
->flags
.q
.std140
||
6497 qual
->flags
.q
.std430
||
6498 qual
->flags
.q
.packed
||
6499 qual
->flags
.q
.shared
) {
6500 _mesa_glsl_error(&loc
, state
,
6501 "uniform/shader storage block layout qualifiers "
6502 "std140, std430, packed, and shared can only be "
6503 "applied to uniform/shader storage blocks, not "
6507 if (qual
->flags
.q
.constant
) {
6508 _mesa_glsl_error(&loc
, state
,
6509 "const storage qualifier cannot be applied "
6510 "to struct or interface block members");
6513 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6515 * "A block member may be declared with a stream identifier, but
6516 * the specified stream must match the stream associated with the
6517 * containing block."
6519 if (qual
->flags
.q
.explicit_stream
) {
6520 unsigned qual_stream
;
6521 if (process_qualifier_constant(state
, &loc
, "stream",
6522 qual
->stream
, &qual_stream
) &&
6523 qual_stream
!= block_stream
) {
6524 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6525 "interface block member does not match "
6526 "the interface block (%u vs %u)", qual_stream
,
6532 unsigned explicit_xfb_buffer
= 0;
6533 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6534 unsigned qual_xfb_buffer
;
6535 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6536 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6537 explicit_xfb_buffer
= 1;
6538 if (qual_xfb_buffer
!= block_xfb_buffer
)
6539 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6540 "interface block member does not match "
6541 "the interface block (%u vs %u)",
6542 qual_xfb_buffer
, block_xfb_buffer
);
6544 xfb_buffer
= (int) qual_xfb_buffer
;
6547 explicit_xfb_buffer
= layout
->flags
.q
.xfb_buffer
;
6548 xfb_buffer
= (int) block_xfb_buffer
;
6551 int xfb_stride
= -1;
6552 if (qual
->flags
.q
.explicit_xfb_stride
) {
6553 unsigned qual_xfb_stride
;
6554 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6555 qual
->xfb_stride
, &qual_xfb_stride
)) {
6556 xfb_stride
= (int) qual_xfb_stride
;
6560 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6561 _mesa_glsl_error(&loc
, state
,
6562 "interpolation qualifiers cannot be used "
6563 "with uniform interface blocks");
6566 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6567 qual
->has_auxiliary_storage()) {
6568 _mesa_glsl_error(&loc
, state
,
6569 "auxiliary storage qualifiers cannot be used "
6570 "in uniform blocks or structures.");
6573 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6574 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6575 _mesa_glsl_error(&loc
, state
,
6576 "row_major and column_major can only be "
6577 "applied to interface blocks");
6579 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6582 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6583 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6584 "readonly and writeonly.");
6587 foreach_list_typed (ast_declaration
, decl
, link
,
6588 &decl_list
->declarations
) {
6589 YYLTYPE loc
= decl
->get_location();
6591 if (!allow_reserved_names
)
6592 validate_identifier(decl
->identifier
, loc
, state
);
6594 const struct glsl_type
*field_type
=
6595 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6596 validate_array_dimensions(field_type
, state
, &loc
);
6597 fields
[i
].type
= field_type
;
6598 fields
[i
].name
= decl
->identifier
;
6599 fields
[i
].interpolation
=
6600 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
6601 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6602 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6603 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6604 fields
[i
].precision
= qual
->precision
;
6605 fields
[i
].offset
= -1;
6606 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6607 fields
[i
].xfb_buffer
= xfb_buffer
;
6608 fields
[i
].xfb_stride
= xfb_stride
;
6610 if (qual
->flags
.q
.explicit_location
) {
6611 unsigned qual_location
;
6612 if (process_qualifier_constant(state
, &loc
, "location",
6613 qual
->location
, &qual_location
)) {
6614 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6615 expl_location
= fields
[i
].location
+
6616 fields
[i
].type
->count_attribute_slots(false);
6619 if (layout
&& layout
->flags
.q
.explicit_location
) {
6620 fields
[i
].location
= expl_location
;
6621 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6623 fields
[i
].location
= -1;
6627 /* Offset can only be used with std430 and std140 layouts an initial
6628 * value of 0 is used for error detection.
6634 if (qual
->flags
.q
.row_major
||
6635 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6641 if(layout
->flags
.q
.std140
) {
6642 align
= field_type
->std140_base_alignment(row_major
);
6643 size
= field_type
->std140_size(row_major
);
6644 } else if (layout
->flags
.q
.std430
) {
6645 align
= field_type
->std430_base_alignment(row_major
);
6646 size
= field_type
->std430_size(row_major
);
6650 if (qual
->flags
.q
.explicit_offset
) {
6651 unsigned qual_offset
;
6652 if (process_qualifier_constant(state
, &loc
, "offset",
6653 qual
->offset
, &qual_offset
)) {
6654 if (align
!= 0 && size
!= 0) {
6655 if (next_offset
> qual_offset
)
6656 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6657 "offset overlaps previous member");
6659 if (qual_offset
% align
) {
6660 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6661 "must be a multiple of the base "
6662 "alignment of %s", field_type
->name
);
6664 fields
[i
].offset
= qual_offset
;
6665 next_offset
= glsl_align(qual_offset
+ size
, align
);
6667 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6668 "with std430 and std140 layouts");
6673 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6674 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6676 if (align
== 0 || size
== 0) {
6677 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6678 "std430 and std140 layouts");
6679 } else if (qual
->flags
.q
.explicit_align
) {
6680 unsigned member_align
;
6681 if (process_qualifier_constant(state
, &loc
, "align",
6682 qual
->align
, &member_align
)) {
6683 if (member_align
== 0 ||
6684 member_align
& (member_align
- 1)) {
6685 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6686 "in not a power of 2");
6688 fields
[i
].offset
= glsl_align(offset
, member_align
);
6689 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6693 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6694 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6698 if (!qual
->flags
.q
.explicit_offset
) {
6699 if (align
!= 0 && size
!= 0)
6700 next_offset
= glsl_align(next_offset
+ size
, align
);
6703 /* From the ARB_enhanced_layouts spec:
6705 * "The given offset applies to the first component of the first
6706 * member of the qualified entity. Then, within the qualified
6707 * entity, subsequent components are each assigned, in order, to
6708 * the next available offset aligned to a multiple of that
6709 * component's size. Aggregate types are flattened down to the
6710 * component level to get this sequence of components."
6712 if (qual
->flags
.q
.explicit_xfb_offset
) {
6713 unsigned xfb_offset
;
6714 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
6715 qual
->offset
, &xfb_offset
)) {
6716 fields
[i
].offset
= xfb_offset
;
6717 block_xfb_offset
= fields
[i
].offset
+
6718 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6721 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
6722 unsigned align
= field_type
->is_double() ? 8 : 4;
6723 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
6725 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6729 /* Propogate row- / column-major information down the fields of the
6730 * structure or interface block. Structures need this data because
6731 * the structure may contain a structure that contains ... a matrix
6732 * that need the proper layout.
6735 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6736 (field_type
->without_array()->is_matrix()
6737 || field_type
->without_array()->is_record())) {
6738 /* If no layout is specified for the field, inherit the layout
6741 fields
[i
].matrix_layout
= matrix_layout
;
6743 if (qual
->flags
.q
.row_major
)
6744 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6745 else if (qual
->flags
.q
.column_major
)
6746 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6748 /* If we're processing an uniform or buffer block, the matrix
6749 * layout must be decided by this point.
6751 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6752 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6755 /* Image qualifiers are allowed on buffer variables, which can only
6756 * be defined inside shader storage buffer objects
6758 if (layout
&& var_mode
== ir_var_shader_storage
) {
6759 /* For readonly and writeonly qualifiers the field definition,
6760 * if set, overwrites the layout qualifier.
6762 if (qual
->flags
.q
.read_only
) {
6763 fields
[i
].image_read_only
= true;
6764 fields
[i
].image_write_only
= false;
6765 } else if (qual
->flags
.q
.write_only
) {
6766 fields
[i
].image_read_only
= false;
6767 fields
[i
].image_write_only
= true;
6769 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6770 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6773 /* For other qualifiers, we set the flag if either the layout
6774 * qualifier or the field qualifier are set
6776 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6777 layout
->flags
.q
.coherent
;
6778 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6779 layout
->flags
.q
._volatile
;
6780 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6781 layout
->flags
.q
.restrict_flag
;
6788 assert(i
== decl_count
);
6790 *fields_ret
= fields
;
6796 ast_struct_specifier::hir(exec_list
*instructions
,
6797 struct _mesa_glsl_parse_state
*state
)
6799 YYLTYPE loc
= this->get_location();
6801 unsigned expl_location
= 0;
6802 if (layout
&& layout
->flags
.q
.explicit_location
) {
6803 if (!process_qualifier_constant(state
, &loc
, "location",
6804 layout
->location
, &expl_location
)) {
6807 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6811 glsl_struct_field
*fields
;
6812 unsigned decl_count
=
6813 ast_process_struct_or_iface_block_members(instructions
,
6815 &this->declarations
,
6818 GLSL_MATRIX_LAYOUT_INHERITED
,
6819 false /* allow_reserved_names */,
6822 0, /* for interface only */
6823 0, /* for interface only */
6824 0, /* for interface only */
6826 0 /* for interface only */);
6828 validate_identifier(this->name
, loc
, state
);
6830 const glsl_type
*t
=
6831 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6833 if (!state
->symbols
->add_type(name
, t
)) {
6834 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6836 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6838 state
->num_user_structures
+ 1);
6840 s
[state
->num_user_structures
] = t
;
6841 state
->user_structures
= s
;
6842 state
->num_user_structures
++;
6846 /* Structure type definitions do not have r-values.
6853 * Visitor class which detects whether a given interface block has been used.
6855 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6858 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6859 : mode(mode
), block(block
), found(false)
6863 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6865 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6869 return visit_continue
;
6872 bool usage_found() const
6878 ir_variable_mode mode
;
6879 const glsl_type
*block
;
6884 is_unsized_array_last_element(ir_variable
*v
)
6886 const glsl_type
*interface_type
= v
->get_interface_type();
6887 int length
= interface_type
->length
;
6889 assert(v
->type
->is_unsized_array());
6891 /* Check if it is the last element of the interface */
6892 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6898 ast_interface_block::hir(exec_list
*instructions
,
6899 struct _mesa_glsl_parse_state
*state
)
6901 YYLTYPE loc
= this->get_location();
6903 /* Interface blocks must be declared at global scope */
6904 if (state
->current_function
!= NULL
) {
6905 _mesa_glsl_error(&loc
, state
,
6906 "Interface block `%s' must be declared "
6911 if (!this->layout
.flags
.q
.buffer
&&
6912 this->layout
.flags
.q
.std430
) {
6913 _mesa_glsl_error(&loc
, state
,
6914 "std430 storage block layout qualifier is supported "
6915 "only for shader storage blocks");
6918 /* The ast_interface_block has a list of ast_declarator_lists. We
6919 * need to turn those into ir_variables with an association
6920 * with this uniform block.
6922 enum glsl_interface_packing packing
;
6923 if (this->layout
.flags
.q
.shared
) {
6924 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6925 } else if (this->layout
.flags
.q
.packed
) {
6926 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6927 } else if (this->layout
.flags
.q
.std430
) {
6928 packing
= GLSL_INTERFACE_PACKING_STD430
;
6930 /* The default layout is std140.
6932 packing
= GLSL_INTERFACE_PACKING_STD140
;
6935 ir_variable_mode var_mode
;
6936 const char *iface_type_name
;
6937 if (this->layout
.flags
.q
.in
) {
6938 var_mode
= ir_var_shader_in
;
6939 iface_type_name
= "in";
6940 } else if (this->layout
.flags
.q
.out
) {
6941 var_mode
= ir_var_shader_out
;
6942 iface_type_name
= "out";
6943 } else if (this->layout
.flags
.q
.uniform
) {
6944 var_mode
= ir_var_uniform
;
6945 iface_type_name
= "uniform";
6946 } else if (this->layout
.flags
.q
.buffer
) {
6947 var_mode
= ir_var_shader_storage
;
6948 iface_type_name
= "buffer";
6950 var_mode
= ir_var_auto
;
6951 iface_type_name
= "UNKNOWN";
6952 assert(!"interface block layout qualifier not found!");
6955 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6956 if (this->layout
.flags
.q
.row_major
)
6957 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6958 else if (this->layout
.flags
.q
.column_major
)
6959 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6961 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6962 exec_list declared_variables
;
6963 glsl_struct_field
*fields
;
6965 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
6966 * that we don't have incompatible qualifiers
6968 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
6969 _mesa_glsl_error(&loc
, state
,
6970 "Interface block sets both readonly and writeonly");
6973 unsigned qual_stream
;
6974 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
6976 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
6977 /* If the stream qualifier is invalid it doesn't make sense to continue
6978 * on and try to compare stream layouts on member variables against it
6979 * so just return early.
6984 unsigned qual_xfb_buffer
;
6985 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
6986 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
6987 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
6991 unsigned qual_xfb_offset
;
6992 if (layout
.flags
.q
.explicit_xfb_offset
) {
6993 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
6994 layout
.offset
, &qual_xfb_offset
)) {
6999 unsigned qual_xfb_stride
;
7000 if (layout
.flags
.q
.explicit_xfb_stride
) {
7001 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7002 layout
.xfb_stride
, &qual_xfb_stride
)) {
7007 unsigned expl_location
= 0;
7008 if (layout
.flags
.q
.explicit_location
) {
7009 if (!process_qualifier_constant(state
, &loc
, "location",
7010 layout
.location
, &expl_location
)) {
7013 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7017 unsigned expl_align
= 0;
7018 if (layout
.flags
.q
.explicit_align
) {
7019 if (!process_qualifier_constant(state
, &loc
, "align",
7020 layout
.align
, &expl_align
)) {
7023 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7024 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7031 unsigned int num_variables
=
7032 ast_process_struct_or_iface_block_members(&declared_variables
,
7034 &this->declarations
,
7038 redeclaring_per_vertex
,
7047 if (!redeclaring_per_vertex
) {
7048 validate_identifier(this->block_name
, loc
, state
);
7050 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7052 * "Block names have no other use within a shader beyond interface
7053 * matching; it is a compile-time error to use a block name at global
7054 * scope for anything other than as a block name."
7056 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7057 if (var
&& !var
->type
->is_interface()) {
7058 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7059 "already used in the scope.",
7064 const glsl_type
*earlier_per_vertex
= NULL
;
7065 if (redeclaring_per_vertex
) {
7066 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7067 * the named interface block gl_in, we can find it by looking at the
7068 * previous declaration of gl_in. Otherwise we can find it by looking
7069 * at the previous decalartion of any of the built-in outputs,
7072 * Also check that the instance name and array-ness of the redeclaration
7076 case ir_var_shader_in
:
7077 if (ir_variable
*earlier_gl_in
=
7078 state
->symbols
->get_variable("gl_in")) {
7079 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7081 _mesa_glsl_error(&loc
, state
,
7082 "redeclaration of gl_PerVertex input not allowed "
7084 _mesa_shader_stage_to_string(state
->stage
));
7086 if (this->instance_name
== NULL
||
7087 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7088 !this->array_specifier
->is_single_dimension()) {
7089 _mesa_glsl_error(&loc
, state
,
7090 "gl_PerVertex input must be redeclared as "
7094 case ir_var_shader_out
:
7095 if (ir_variable
*earlier_gl_Position
=
7096 state
->symbols
->get_variable("gl_Position")) {
7097 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7098 } else if (ir_variable
*earlier_gl_out
=
7099 state
->symbols
->get_variable("gl_out")) {
7100 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7102 _mesa_glsl_error(&loc
, state
,
7103 "redeclaration of gl_PerVertex output not "
7104 "allowed in the %s shader",
7105 _mesa_shader_stage_to_string(state
->stage
));
7107 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7108 if (this->instance_name
== NULL
||
7109 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7110 _mesa_glsl_error(&loc
, state
,
7111 "gl_PerVertex output must be redeclared as "
7115 if (this->instance_name
!= NULL
) {
7116 _mesa_glsl_error(&loc
, state
,
7117 "gl_PerVertex output may not be redeclared with "
7118 "an instance name");
7123 _mesa_glsl_error(&loc
, state
,
7124 "gl_PerVertex must be declared as an input or an "
7129 if (earlier_per_vertex
== NULL
) {
7130 /* An error has already been reported. Bail out to avoid null
7131 * dereferences later in this function.
7136 /* Copy locations from the old gl_PerVertex interface block. */
7137 for (unsigned i
= 0; i
< num_variables
; i
++) {
7138 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7140 _mesa_glsl_error(&loc
, state
,
7141 "redeclaration of gl_PerVertex must be a subset "
7142 "of the built-in members of gl_PerVertex");
7144 fields
[i
].location
=
7145 earlier_per_vertex
->fields
.structure
[j
].location
;
7147 earlier_per_vertex
->fields
.structure
[j
].offset
;
7148 fields
[i
].interpolation
=
7149 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7150 fields
[i
].centroid
=
7151 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7153 earlier_per_vertex
->fields
.structure
[j
].sample
;
7155 earlier_per_vertex
->fields
.structure
[j
].patch
;
7156 fields
[i
].precision
=
7157 earlier_per_vertex
->fields
.structure
[j
].precision
;
7158 fields
[i
].explicit_xfb_buffer
=
7159 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7160 fields
[i
].xfb_buffer
=
7161 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7162 fields
[i
].xfb_stride
=
7163 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7167 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7170 * If a built-in interface block is redeclared, it must appear in
7171 * the shader before any use of any member included in the built-in
7172 * declaration, or a compilation error will result.
7174 * This appears to be a clarification to the behaviour established for
7175 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7176 * regardless of GLSL version.
7178 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7179 v
.run(instructions
);
7180 if (v
.usage_found()) {
7181 _mesa_glsl_error(&loc
, state
,
7182 "redeclaration of a built-in interface block must "
7183 "appear before any use of any member of the "
7188 const glsl_type
*block_type
=
7189 glsl_type::get_interface_instance(fields
,
7194 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7196 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7197 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7200 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7201 YYLTYPE loc
= this->get_location();
7202 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7203 "already taken in the current scope",
7204 this->block_name
, iface_type_name
);
7207 /* Since interface blocks cannot contain statements, it should be
7208 * impossible for the block to generate any instructions.
7210 assert(declared_variables
.is_empty());
7212 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7214 * Geometry shader input variables get the per-vertex values written
7215 * out by vertex shader output variables of the same names. Since a
7216 * geometry shader operates on a set of vertices, each input varying
7217 * variable (or input block, see interface blocks below) needs to be
7218 * declared as an array.
7220 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7221 var_mode
== ir_var_shader_in
) {
7222 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7223 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7224 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7225 this->array_specifier
== NULL
&&
7226 var_mode
== ir_var_shader_in
) {
7227 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7228 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7229 this->array_specifier
== NULL
&&
7230 var_mode
== ir_var_shader_out
) {
7231 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7235 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7238 * "If an instance name (instance-name) is used, then it puts all the
7239 * members inside a scope within its own name space, accessed with the
7240 * field selector ( . ) operator (analogously to structures)."
7242 if (this->instance_name
) {
7243 if (redeclaring_per_vertex
) {
7244 /* When a built-in in an unnamed interface block is redeclared,
7245 * get_variable_being_redeclared() calls
7246 * check_builtin_array_max_size() to make sure that built-in array
7247 * variables aren't redeclared to illegal sizes. But we're looking
7248 * at a redeclaration of a named built-in interface block. So we
7249 * have to manually call check_builtin_array_max_size() for all parts
7250 * of the interface that are arrays.
7252 for (unsigned i
= 0; i
< num_variables
; i
++) {
7253 if (fields
[i
].type
->is_array()) {
7254 const unsigned size
= fields
[i
].type
->array_size();
7255 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7259 validate_identifier(this->instance_name
, loc
, state
);
7264 if (this->array_specifier
!= NULL
) {
7265 const glsl_type
*block_array_type
=
7266 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7268 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7270 * For uniform blocks declared an array, each individual array
7271 * element corresponds to a separate buffer object backing one
7272 * instance of the block. As the array size indicates the number
7273 * of buffer objects needed, uniform block array declarations
7274 * must specify an array size.
7276 * And a few paragraphs later:
7278 * Geometry shader input blocks must be declared as arrays and
7279 * follow the array declaration and linking rules for all
7280 * geometry shader inputs. All other input and output block
7281 * arrays must specify an array size.
7283 * The same applies to tessellation shaders.
7285 * The upshot of this is that the only circumstance where an
7286 * interface array size *doesn't* need to be specified is on a
7287 * geometry shader input, tessellation control shader input,
7288 * tessellation control shader output, and tessellation evaluation
7291 if (block_array_type
->is_unsized_array()) {
7292 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7293 state
->stage
== MESA_SHADER_TESS_CTRL
||
7294 state
->stage
== MESA_SHADER_TESS_EVAL
;
7295 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7297 if (this->layout
.flags
.q
.in
) {
7299 _mesa_glsl_error(&loc
, state
,
7300 "unsized input block arrays not allowed in "
7302 _mesa_shader_stage_to_string(state
->stage
));
7303 } else if (this->layout
.flags
.q
.out
) {
7305 _mesa_glsl_error(&loc
, state
,
7306 "unsized output block arrays not allowed in "
7308 _mesa_shader_stage_to_string(state
->stage
));
7310 /* by elimination, this is a uniform block array */
7311 _mesa_glsl_error(&loc
, state
,
7312 "unsized uniform block arrays not allowed in "
7314 _mesa_shader_stage_to_string(state
->stage
));
7318 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7320 * * Arrays of arrays of blocks are not allowed
7322 if (state
->es_shader
&& block_array_type
->is_array() &&
7323 block_array_type
->fields
.array
->is_array()) {
7324 _mesa_glsl_error(&loc
, state
,
7325 "arrays of arrays interface blocks are "
7329 var
= new(state
) ir_variable(block_array_type
,
7330 this->instance_name
,
7333 var
= new(state
) ir_variable(block_type
,
7334 this->instance_name
,
7338 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7339 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7341 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7342 var
->data
.read_only
= true;
7344 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7345 handle_geometry_shader_input_decl(state
, loc
, var
);
7346 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7347 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7348 handle_tess_shader_input_decl(state
, loc
, var
);
7349 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7350 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7352 for (unsigned i
= 0; i
< num_variables
; i
++) {
7353 if (fields
[i
].type
->is_unsized_array()) {
7354 if (var_mode
== ir_var_shader_storage
) {
7355 if (i
!= (num_variables
- 1)) {
7356 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7357 "only last member of a shader storage block "
7358 "can be defined as unsized array",
7362 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7364 * "If an array is declared as the last member of a shader storage
7365 * block and the size is not specified at compile-time, it is
7366 * sized at run-time. In all other cases, arrays are sized only
7369 if (state
->es_shader
) {
7370 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7371 "only last member of a shader storage block "
7372 "can be defined as unsized array",
7379 if (ir_variable
*earlier
=
7380 state
->symbols
->get_variable(this->instance_name
)) {
7381 if (!redeclaring_per_vertex
) {
7382 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7383 this->instance_name
);
7385 earlier
->data
.how_declared
= ir_var_declared_normally
;
7386 earlier
->type
= var
->type
;
7387 earlier
->reinit_interface_type(block_type
);
7390 if (this->layout
.flags
.q
.explicit_binding
) {
7391 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7395 var
->data
.stream
= qual_stream
;
7396 if (layout
.flags
.q
.explicit_location
) {
7397 var
->data
.location
= expl_location
;
7398 var
->data
.explicit_location
= true;
7401 state
->symbols
->add_variable(var
);
7402 instructions
->push_tail(var
);
7405 /* In order to have an array size, the block must also be declared with
7408 assert(this->array_specifier
== NULL
);
7410 for (unsigned i
= 0; i
< num_variables
; i
++) {
7412 new(state
) ir_variable(fields
[i
].type
,
7413 ralloc_strdup(state
, fields
[i
].name
),
7415 var
->data
.interpolation
= fields
[i
].interpolation
;
7416 var
->data
.centroid
= fields
[i
].centroid
;
7417 var
->data
.sample
= fields
[i
].sample
;
7418 var
->data
.patch
= fields
[i
].patch
;
7419 var
->data
.stream
= qual_stream
;
7420 var
->data
.location
= fields
[i
].location
;
7422 if (fields
[i
].location
!= -1)
7423 var
->data
.explicit_location
= true;
7425 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7426 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7428 if (fields
[i
].offset
!= -1)
7429 var
->data
.explicit_xfb_offset
= true;
7430 var
->data
.offset
= fields
[i
].offset
;
7432 var
->init_interface_type(block_type
);
7434 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7435 var
->data
.read_only
= true;
7437 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7438 if (state
->es_shader
) {
7439 var
->data
.precision
=
7440 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7444 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7445 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7446 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7448 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7451 if (var
->data
.mode
== ir_var_shader_storage
) {
7452 var
->data
.image_read_only
= fields
[i
].image_read_only
;
7453 var
->data
.image_write_only
= fields
[i
].image_write_only
;
7454 var
->data
.image_coherent
= fields
[i
].image_coherent
;
7455 var
->data
.image_volatile
= fields
[i
].image_volatile
;
7456 var
->data
.image_restrict
= fields
[i
].image_restrict
;
7459 /* Examine var name here since var may get deleted in the next call */
7460 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7462 if (redeclaring_per_vertex
) {
7463 ir_variable
*earlier
=
7464 get_variable_being_redeclared(var
, loc
, state
,
7465 true /* allow_all_redeclarations */);
7466 if (!var_is_gl_id
|| earlier
== NULL
) {
7467 _mesa_glsl_error(&loc
, state
,
7468 "redeclaration of gl_PerVertex can only "
7469 "include built-in variables");
7470 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7471 _mesa_glsl_error(&loc
, state
,
7472 "`%s' has already been redeclared",
7475 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7476 earlier
->reinit_interface_type(block_type
);
7481 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7482 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7484 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7485 * The UBO declaration itself doesn't get an ir_variable unless it
7486 * has an instance name. This is ugly.
7488 if (this->layout
.flags
.q
.explicit_binding
) {
7489 apply_explicit_binding(state
, &loc
, var
,
7490 var
->get_interface_type(), &this->layout
);
7493 if (var
->type
->is_unsized_array()) {
7494 if (var
->is_in_shader_storage_block()) {
7495 if (!is_unsized_array_last_element(var
)) {
7496 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7497 "only last member of a shader storage block "
7498 "can be defined as unsized array",
7501 var
->data
.from_ssbo_unsized_array
= true;
7503 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7505 * "If an array is declared as the last member of a shader storage
7506 * block and the size is not specified at compile-time, it is
7507 * sized at run-time. In all other cases, arrays are sized only
7510 if (state
->es_shader
) {
7511 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7512 "only last member of a shader storage block "
7513 "can be defined as unsized array",
7519 state
->symbols
->add_variable(var
);
7520 instructions
->push_tail(var
);
7523 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7524 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7526 * It is also a compilation error ... to redeclare a built-in
7527 * block and then use a member from that built-in block that was
7528 * not included in the redeclaration.
7530 * This appears to be a clarification to the behaviour established
7531 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7532 * behaviour regardless of GLSL version.
7534 * To prevent the shader from using a member that was not included in
7535 * the redeclaration, we disable any ir_variables that are still
7536 * associated with the old declaration of gl_PerVertex (since we've
7537 * already updated all of the variables contained in the new
7538 * gl_PerVertex to point to it).
7540 * As a side effect this will prevent
7541 * validate_intrastage_interface_blocks() from getting confused and
7542 * thinking there are conflicting definitions of gl_PerVertex in the
7545 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7546 ir_variable
*const var
= node
->as_variable();
7548 var
->get_interface_type() == earlier_per_vertex
&&
7549 var
->data
.mode
== var_mode
) {
7550 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7551 _mesa_glsl_error(&loc
, state
,
7552 "redeclaration of gl_PerVertex cannot "
7553 "follow a redeclaration of `%s'",
7556 state
->symbols
->disable_variable(var
->name
);
7568 ast_tcs_output_layout::hir(exec_list
*instructions
,
7569 struct _mesa_glsl_parse_state
*state
)
7571 YYLTYPE loc
= this->get_location();
7573 unsigned num_vertices
;
7574 if (!state
->out_qualifier
->vertices
->
7575 process_qualifier_constant(state
, "vertices", &num_vertices
,
7577 /* return here to stop cascading incorrect error messages */
7581 /* If any shader outputs occurred before this declaration and specified an
7582 * array size, make sure the size they specified is consistent with the
7585 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7586 _mesa_glsl_error(&loc
, state
,
7587 "this tessellation control shader output layout "
7588 "specifies %u vertices, but a previous output "
7589 "is declared with size %u",
7590 num_vertices
, state
->tcs_output_size
);
7594 state
->tcs_output_vertices_specified
= true;
7596 /* If any shader outputs occurred before this declaration and did not
7597 * specify an array size, their size is determined now.
7599 foreach_in_list (ir_instruction
, node
, instructions
) {
7600 ir_variable
*var
= node
->as_variable();
7601 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7604 /* Note: Not all tessellation control shader output are arrays. */
7605 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7608 if (var
->data
.max_array_access
>= num_vertices
) {
7609 _mesa_glsl_error(&loc
, state
,
7610 "this tessellation control shader output layout "
7611 "specifies %u vertices, but an access to element "
7612 "%u of output `%s' already exists", num_vertices
,
7613 var
->data
.max_array_access
, var
->name
);
7615 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7625 ast_gs_input_layout::hir(exec_list
*instructions
,
7626 struct _mesa_glsl_parse_state
*state
)
7628 YYLTYPE loc
= this->get_location();
7630 /* If any geometry input layout declaration preceded this one, make sure it
7631 * was consistent with this one.
7633 if (state
->gs_input_prim_type_specified
&&
7634 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7635 _mesa_glsl_error(&loc
, state
,
7636 "geometry shader input layout does not match"
7637 " previous declaration");
7641 /* If any shader inputs occurred before this declaration and specified an
7642 * array size, make sure the size they specified is consistent with the
7645 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7646 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7647 _mesa_glsl_error(&loc
, state
,
7648 "this geometry shader input layout implies %u vertices"
7649 " per primitive, but a previous input is declared"
7650 " with size %u", num_vertices
, state
->gs_input_size
);
7654 state
->gs_input_prim_type_specified
= true;
7656 /* If any shader inputs occurred before this declaration and did not
7657 * specify an array size, their size is determined now.
7659 foreach_in_list(ir_instruction
, node
, instructions
) {
7660 ir_variable
*var
= node
->as_variable();
7661 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7664 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7668 if (var
->type
->is_unsized_array()) {
7669 if (var
->data
.max_array_access
>= num_vertices
) {
7670 _mesa_glsl_error(&loc
, state
,
7671 "this geometry shader input layout implies %u"
7672 " vertices, but an access to element %u of input"
7673 " `%s' already exists", num_vertices
,
7674 var
->data
.max_array_access
, var
->name
);
7676 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7687 ast_cs_input_layout::hir(exec_list
*instructions
,
7688 struct _mesa_glsl_parse_state
*state
)
7690 YYLTYPE loc
= this->get_location();
7692 /* From the ARB_compute_shader specification:
7694 * If the local size of the shader in any dimension is greater
7695 * than the maximum size supported by the implementation for that
7696 * dimension, a compile-time error results.
7698 * It is not clear from the spec how the error should be reported if
7699 * the total size of the work group exceeds
7700 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7701 * report it at compile time as well.
7703 GLuint64 total_invocations
= 1;
7704 unsigned qual_local_size
[3];
7705 for (int i
= 0; i
< 3; i
++) {
7707 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7709 /* Infer a local_size of 1 for unspecified dimensions */
7710 if (this->local_size
[i
] == NULL
) {
7711 qual_local_size
[i
] = 1;
7712 } else if (!this->local_size
[i
]->
7713 process_qualifier_constant(state
, local_size_str
,
7714 &qual_local_size
[i
], false)) {
7715 ralloc_free(local_size_str
);
7718 ralloc_free(local_size_str
);
7720 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7721 _mesa_glsl_error(&loc
, state
,
7722 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7724 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7727 total_invocations
*= qual_local_size
[i
];
7728 if (total_invocations
>
7729 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7730 _mesa_glsl_error(&loc
, state
,
7731 "product of local_sizes exceeds "
7732 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7733 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7738 /* If any compute input layout declaration preceded this one, make sure it
7739 * was consistent with this one.
7741 if (state
->cs_input_local_size_specified
) {
7742 for (int i
= 0; i
< 3; i
++) {
7743 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7744 _mesa_glsl_error(&loc
, state
,
7745 "compute shader input layout does not match"
7746 " previous declaration");
7752 state
->cs_input_local_size_specified
= true;
7753 for (int i
= 0; i
< 3; i
++)
7754 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7756 /* We may now declare the built-in constant gl_WorkGroupSize (see
7757 * builtin_variable_generator::generate_constants() for why we didn't
7758 * declare it earlier).
7760 ir_variable
*var
= new(state
->symbols
)
7761 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7762 var
->data
.how_declared
= ir_var_declared_implicitly
;
7763 var
->data
.read_only
= true;
7764 instructions
->push_tail(var
);
7765 state
->symbols
->add_variable(var
);
7766 ir_constant_data data
;
7767 memset(&data
, 0, sizeof(data
));
7768 for (int i
= 0; i
< 3; i
++)
7769 data
.u
[i
] = qual_local_size
[i
];
7770 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7771 var
->constant_initializer
=
7772 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7773 var
->data
.has_initializer
= true;
7780 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7781 exec_list
*instructions
)
7783 bool gl_FragColor_assigned
= false;
7784 bool gl_FragData_assigned
= false;
7785 bool gl_FragSecondaryColor_assigned
= false;
7786 bool gl_FragSecondaryData_assigned
= false;
7787 bool user_defined_fs_output_assigned
= false;
7788 ir_variable
*user_defined_fs_output
= NULL
;
7790 /* It would be nice to have proper location information. */
7792 memset(&loc
, 0, sizeof(loc
));
7794 foreach_in_list(ir_instruction
, node
, instructions
) {
7795 ir_variable
*var
= node
->as_variable();
7797 if (!var
|| !var
->data
.assigned
)
7800 if (strcmp(var
->name
, "gl_FragColor") == 0)
7801 gl_FragColor_assigned
= true;
7802 else if (strcmp(var
->name
, "gl_FragData") == 0)
7803 gl_FragData_assigned
= true;
7804 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7805 gl_FragSecondaryColor_assigned
= true;
7806 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7807 gl_FragSecondaryData_assigned
= true;
7808 else if (!is_gl_identifier(var
->name
)) {
7809 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7810 var
->data
.mode
== ir_var_shader_out
) {
7811 user_defined_fs_output_assigned
= true;
7812 user_defined_fs_output
= var
;
7817 /* From the GLSL 1.30 spec:
7819 * "If a shader statically assigns a value to gl_FragColor, it
7820 * may not assign a value to any element of gl_FragData. If a
7821 * shader statically writes a value to any element of
7822 * gl_FragData, it may not assign a value to
7823 * gl_FragColor. That is, a shader may assign values to either
7824 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7825 * linked together must also consistently write just one of
7826 * these variables. Similarly, if user declared output
7827 * variables are in use (statically assigned to), then the
7828 * built-in variables gl_FragColor and gl_FragData may not be
7829 * assigned to. These incorrect usages all generate compile
7832 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7833 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7834 "`gl_FragColor' and `gl_FragData'");
7835 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7836 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7837 "`gl_FragColor' and `%s'",
7838 user_defined_fs_output
->name
);
7839 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7840 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7841 "`gl_FragSecondaryColorEXT' and"
7842 " `gl_FragSecondaryDataEXT'");
7843 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7844 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7845 "`gl_FragColor' and"
7846 " `gl_FragSecondaryDataEXT'");
7847 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7848 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7850 " `gl_FragSecondaryColorEXT'");
7851 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7852 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7853 "`gl_FragData' and `%s'",
7854 user_defined_fs_output
->name
);
7857 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7858 !state
->EXT_blend_func_extended_enable
) {
7859 _mesa_glsl_error(&loc
, state
,
7860 "Dual source blending requires EXT_blend_func_extended");
7866 remove_per_vertex_blocks(exec_list
*instructions
,
7867 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7869 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7870 * if it exists in this shader type.
7872 const glsl_type
*per_vertex
= NULL
;
7874 case ir_var_shader_in
:
7875 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7876 per_vertex
= gl_in
->get_interface_type();
7878 case ir_var_shader_out
:
7879 if (ir_variable
*gl_Position
=
7880 state
->symbols
->get_variable("gl_Position")) {
7881 per_vertex
= gl_Position
->get_interface_type();
7885 assert(!"Unexpected mode");
7889 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7890 * need to do anything.
7892 if (per_vertex
== NULL
)
7895 /* If the interface block is used by the shader, then we don't need to do
7898 interface_block_usage_visitor
v(mode
, per_vertex
);
7899 v
.run(instructions
);
7900 if (v
.usage_found())
7903 /* Remove any ir_variable declarations that refer to the interface block
7906 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7907 ir_variable
*const var
= node
->as_variable();
7908 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
7909 var
->data
.mode
== mode
) {
7910 state
->symbols
->disable_variable(var
->name
);