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 "util/hash_table.h"
57 #include "main/mtypes.h"
58 #include "main/macros.h"
59 #include "main/shaderobj.h"
61 #include "ir_builder.h"
62 #include "builtin_functions.h"
64 using namespace ir_builder
;
67 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
68 exec_list
*instructions
);
70 verify_subroutine_associated_funcs(struct _mesa_glsl_parse_state
*state
);
73 remove_per_vertex_blocks(exec_list
*instructions
,
74 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
77 * Visitor class that finds the first instance of any write-only variable that
78 * is ever read, if any
80 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
83 read_from_write_only_variable_visitor() : found(NULL
)
87 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
89 if (this->in_assignee
)
90 return visit_continue
;
92 ir_variable
*var
= ir
->variable_referenced();
93 /* We can have memory_write_only set on both images and buffer variables,
94 * but in the former there is a distinction between reads from
95 * the variable itself (write_only) and from the memory they point to
96 * (memory_write_only), while in the case of buffer variables there is
97 * no such distinction, that is why this check here is limited to
98 * buffer variables alone.
100 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
101 return visit_continue
;
103 if (var
->data
.memory_write_only
) {
108 return visit_continue
;
111 ir_variable
*get_variable() {
115 virtual ir_visitor_status
visit_enter(ir_expression
*ir
)
117 /* .length() doesn't actually read anything */
118 if (ir
->operation
== ir_unop_ssbo_unsized_array_length
)
119 return visit_continue_with_parent
;
121 return visit_continue
;
129 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
131 _mesa_glsl_initialize_variables(instructions
, state
);
133 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
135 state
->current_function
= NULL
;
137 state
->toplevel_ir
= instructions
;
139 state
->gs_input_prim_type_specified
= false;
140 state
->tcs_output_vertices_specified
= false;
141 state
->cs_input_local_size_specified
= false;
143 /* Section 4.2 of the GLSL 1.20 specification states:
144 * "The built-in functions are scoped in a scope outside the global scope
145 * users declare global variables in. That is, a shader's global scope,
146 * available for user-defined functions and global variables, is nested
147 * inside the scope containing the built-in functions."
149 * Since built-in functions like ftransform() access built-in variables,
150 * it follows that those must be in the outer scope as well.
152 * We push scope here to create this nesting effect...but don't pop.
153 * This way, a shader's globals are still in the symbol table for use
156 state
->symbols
->push_scope();
158 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
159 ast
->hir(instructions
, state
);
161 verify_subroutine_associated_funcs(state
);
162 detect_recursion_unlinked(state
, instructions
);
163 detect_conflicting_assignments(state
, instructions
);
165 state
->toplevel_ir
= NULL
;
167 /* Move all of the variable declarations to the front of the IR list, and
168 * reverse the order. This has the (intended!) side effect that vertex
169 * shader inputs and fragment shader outputs will appear in the IR in the
170 * same order that they appeared in the shader code. This results in the
171 * locations being assigned in the declared order. Many (arguably buggy)
172 * applications depend on this behavior, and it matches what nearly all
175 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
176 ir_variable
*const var
= node
->as_variable();
182 instructions
->push_head(var
);
185 /* Figure out if gl_FragCoord is actually used in fragment shader */
186 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
188 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
190 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
192 * If multiple shaders using members of a built-in block belonging to
193 * the same interface are linked together in the same program, they
194 * must all redeclare the built-in block in the same way, as described
195 * in section 4.3.7 "Interface Blocks" for interface block matching, or
196 * a link error will result.
198 * The phrase "using members of a built-in block" implies that if two
199 * shaders are linked together and one of them *does not use* any members
200 * of the built-in block, then that shader does not need to have a matching
201 * redeclaration of the built-in block.
203 * This appears to be a clarification to the behaviour established for
204 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
207 * The definition of "interface" in section 4.3.7 that applies here is as
210 * The boundary between adjacent programmable pipeline stages: This
211 * spans all the outputs in all compilation units of the first stage
212 * and all the inputs in all compilation units of the second stage.
214 * Therefore this rule applies to both inter- and intra-stage linking.
216 * The easiest way to implement this is to check whether the shader uses
217 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
218 * remove all the relevant variable declaration from the IR, so that the
219 * linker won't see them and complain about mismatches.
221 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
222 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
224 /* Check that we don't have reads from write-only variables */
225 read_from_write_only_variable_visitor v
;
227 ir_variable
*error_var
= v
.get_variable();
229 /* It would be nice to have proper location information, but for that
230 * we would need to check this as we process each kind of AST node
233 memset(&loc
, 0, sizeof(loc
));
234 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
240 static ir_expression_operation
241 get_implicit_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
242 struct _mesa_glsl_parse_state
*state
)
244 switch (to
->base_type
) {
245 case GLSL_TYPE_FLOAT
:
246 switch (from
->base_type
) {
247 case GLSL_TYPE_INT
: return ir_unop_i2f
;
248 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
249 default: return (ir_expression_operation
)0;
253 if (!state
->has_implicit_uint_to_int_conversion())
254 return (ir_expression_operation
)0;
255 switch (from
->base_type
) {
256 case GLSL_TYPE_INT
: return ir_unop_i2u
;
257 default: return (ir_expression_operation
)0;
260 case GLSL_TYPE_DOUBLE
:
261 if (!state
->has_double())
262 return (ir_expression_operation
)0;
263 switch (from
->base_type
) {
264 case GLSL_TYPE_INT
: return ir_unop_i2d
;
265 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
266 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
267 case GLSL_TYPE_INT64
: return ir_unop_i642d
;
268 case GLSL_TYPE_UINT64
: return ir_unop_u642d
;
269 default: return (ir_expression_operation
)0;
272 case GLSL_TYPE_UINT64
:
273 if (!state
->has_int64())
274 return (ir_expression_operation
)0;
275 switch (from
->base_type
) {
276 case GLSL_TYPE_INT
: return ir_unop_i2u64
;
277 case GLSL_TYPE_UINT
: return ir_unop_u2u64
;
278 case GLSL_TYPE_INT64
: return ir_unop_i642u64
;
279 default: return (ir_expression_operation
)0;
282 case GLSL_TYPE_INT64
:
283 if (!state
->has_int64())
284 return (ir_expression_operation
)0;
285 switch (from
->base_type
) {
286 case GLSL_TYPE_INT
: return ir_unop_i2i64
;
287 default: return (ir_expression_operation
)0;
290 default: return (ir_expression_operation
)0;
296 * If a conversion is available, convert one operand to a different type
298 * The \c from \c ir_rvalue is converted "in place".
300 * \param to Type that the operand it to be converted to
301 * \param from Operand that is being converted
302 * \param state GLSL compiler state
305 * If a conversion is possible (or unnecessary), \c true is returned.
306 * Otherwise \c false is returned.
309 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
310 struct _mesa_glsl_parse_state
*state
)
313 if (to
->base_type
== from
->type
->base_type
)
316 /* Prior to GLSL 1.20, there are no implicit conversions */
317 if (!state
->has_implicit_conversions())
320 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
322 * "There are no implicit array or structure conversions. For
323 * example, an array of int cannot be implicitly converted to an
326 if (!to
->is_numeric() || !from
->type
->is_numeric())
329 /* We don't actually want the specific type `to`, we want a type
330 * with the same base type as `to`, but the same vector width as
333 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
334 from
->type
->matrix_columns
);
336 ir_expression_operation op
= get_implicit_conversion_operation(to
, from
->type
, state
);
338 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
346 static const struct glsl_type
*
347 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
349 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
351 const glsl_type
*type_a
= value_a
->type
;
352 const glsl_type
*type_b
= value_b
->type
;
354 /* From GLSL 1.50 spec, page 56:
356 * "The arithmetic binary operators add (+), subtract (-),
357 * multiply (*), and divide (/) operate on integer and
358 * floating-point scalars, vectors, and matrices."
360 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
361 _mesa_glsl_error(loc
, state
,
362 "operands to arithmetic operators must be numeric");
363 return glsl_type::error_type
;
367 /* "If one operand is floating-point based and the other is
368 * not, then the conversions from Section 4.1.10 "Implicit
369 * Conversions" are applied to the non-floating-point-based operand."
371 if (!apply_implicit_conversion(type_a
, value_b
, state
)
372 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
373 _mesa_glsl_error(loc
, state
,
374 "could not implicitly convert operands to "
375 "arithmetic operator");
376 return glsl_type::error_type
;
378 type_a
= value_a
->type
;
379 type_b
= value_b
->type
;
381 /* "If the operands are integer types, they must both be signed or
384 * From this rule and the preceeding conversion it can be inferred that
385 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
386 * The is_numeric check above already filtered out the case where either
387 * type is not one of these, so now the base types need only be tested for
390 if (type_a
->base_type
!= type_b
->base_type
) {
391 _mesa_glsl_error(loc
, state
,
392 "base type mismatch for arithmetic operator");
393 return glsl_type::error_type
;
396 /* "All arithmetic binary operators result in the same fundamental type
397 * (signed integer, unsigned integer, or floating-point) as the
398 * operands they operate on, after operand type conversion. After
399 * conversion, the following cases are valid
401 * * The two operands are scalars. In this case the operation is
402 * applied, resulting in a scalar."
404 if (type_a
->is_scalar() && type_b
->is_scalar())
407 /* "* One operand is a scalar, and the other is a vector or matrix.
408 * In this case, the scalar operation is applied independently to each
409 * component of the vector or matrix, resulting in the same size
412 if (type_a
->is_scalar()) {
413 if (!type_b
->is_scalar())
415 } else if (type_b
->is_scalar()) {
419 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
420 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
423 assert(!type_a
->is_scalar());
424 assert(!type_b
->is_scalar());
426 /* "* The two operands are vectors of the same size. In this case, the
427 * operation is done component-wise resulting in the same size
430 if (type_a
->is_vector() && type_b
->is_vector()) {
431 if (type_a
== type_b
) {
434 _mesa_glsl_error(loc
, state
,
435 "vector size mismatch for arithmetic operator");
436 return glsl_type::error_type
;
440 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
441 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
442 * <vector, vector> have been handled. At least one of the operands must
443 * be matrix. Further, since there are no integer matrix types, the base
444 * type of both operands must be float.
446 assert(type_a
->is_matrix() || type_b
->is_matrix());
447 assert(type_a
->is_float() || type_a
->is_double());
448 assert(type_b
->is_float() || type_b
->is_double());
450 /* "* The operator is add (+), subtract (-), or divide (/), and the
451 * operands are matrices with the same number of rows and the same
452 * number of columns. In this case, the operation is done component-
453 * wise resulting in the same size matrix."
454 * * The operator is multiply (*), where both operands are matrices or
455 * one operand is a vector and the other a matrix. A right vector
456 * operand is treated as a column vector and a left vector operand as a
457 * row vector. In all these cases, it is required that the number of
458 * columns of the left operand is equal to the number of rows of the
459 * right operand. Then, the multiply (*) operation does a linear
460 * algebraic multiply, yielding an object that has the same number of
461 * rows as the left operand and the same number of columns as the right
462 * operand. Section 5.10 "Vector and Matrix Operations" explains in
463 * more detail how vectors and matrices are operated on."
466 if (type_a
== type_b
)
469 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
471 if (type
== glsl_type::error_type
) {
472 _mesa_glsl_error(loc
, state
,
473 "size mismatch for matrix multiplication");
480 /* "All other cases are illegal."
482 _mesa_glsl_error(loc
, state
, "type mismatch");
483 return glsl_type::error_type
;
487 static const struct glsl_type
*
488 unary_arithmetic_result_type(const struct glsl_type
*type
,
489 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
491 /* From GLSL 1.50 spec, page 57:
493 * "The arithmetic unary operators negate (-), post- and pre-increment
494 * and decrement (-- and ++) operate on integer or floating-point
495 * values (including vectors and matrices). All unary operators work
496 * component-wise on their operands. These result with the same type
499 if (!type
->is_numeric()) {
500 _mesa_glsl_error(loc
, state
,
501 "operands to arithmetic operators must be numeric");
502 return glsl_type::error_type
;
509 * \brief Return the result type of a bit-logic operation.
511 * If the given types to the bit-logic operator are invalid, return
512 * glsl_type::error_type.
514 * \param value_a LHS of bit-logic op
515 * \param value_b RHS of bit-logic op
517 static const struct glsl_type
*
518 bit_logic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
520 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
522 const glsl_type
*type_a
= value_a
->type
;
523 const glsl_type
*type_b
= value_b
->type
;
525 if (!state
->check_bitwise_operations_allowed(loc
)) {
526 return glsl_type::error_type
;
529 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
531 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
532 * (|). The operands must be of type signed or unsigned integers or
535 if (!type_a
->is_integer_32_64()) {
536 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
537 ast_expression::operator_string(op
));
538 return glsl_type::error_type
;
540 if (!type_b
->is_integer_32_64()) {
541 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
542 ast_expression::operator_string(op
));
543 return glsl_type::error_type
;
546 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
547 * make sense for bitwise operations, as they don't operate on floats.
549 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
550 * here. It wasn't clear whether or not we should apply them to bitwise
551 * operations. However, Khronos has decided that they should in future
552 * language revisions. Applications also rely on this behavior. We opt
553 * to apply them in general, but issue a portability warning.
555 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
557 if (type_a
->base_type
!= type_b
->base_type
) {
558 if (!apply_implicit_conversion(type_a
, value_b
, state
)
559 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
560 _mesa_glsl_error(loc
, state
,
561 "could not implicitly convert operands to "
563 ast_expression::operator_string(op
));
564 return glsl_type::error_type
;
566 _mesa_glsl_warning(loc
, state
,
567 "some implementations may not support implicit "
568 "int -> uint conversions for `%s' operators; "
569 "consider casting explicitly for portability",
570 ast_expression::operator_string(op
));
572 type_a
= value_a
->type
;
573 type_b
= value_b
->type
;
576 /* "The fundamental types of the operands (signed or unsigned) must
579 if (type_a
->base_type
!= type_b
->base_type
) {
580 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
581 "base type", ast_expression::operator_string(op
));
582 return glsl_type::error_type
;
585 /* "The operands cannot be vectors of differing size." */
586 if (type_a
->is_vector() &&
587 type_b
->is_vector() &&
588 type_a
->vector_elements
!= type_b
->vector_elements
) {
589 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
590 "different sizes", ast_expression::operator_string(op
));
591 return glsl_type::error_type
;
594 /* "If one operand is a scalar and the other a vector, the scalar is
595 * applied component-wise to the vector, resulting in the same type as
596 * the vector. The fundamental types of the operands [...] will be the
597 * resulting fundamental type."
599 if (type_a
->is_scalar())
605 static const struct glsl_type
*
606 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
607 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
609 const glsl_type
*type_a
= value_a
->type
;
610 const glsl_type
*type_b
= value_b
->type
;
612 if (!state
->EXT_gpu_shader4_enable
&&
613 !state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
614 return glsl_type::error_type
;
617 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
619 * "The operator modulus (%) operates on signed or unsigned integers or
622 if (!type_a
->is_integer_32_64()) {
623 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
624 return glsl_type::error_type
;
626 if (!type_b
->is_integer_32_64()) {
627 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
628 return glsl_type::error_type
;
631 /* "If the fundamental types in the operands do not match, then the
632 * conversions from section 4.1.10 "Implicit Conversions" are applied
633 * to create matching types."
635 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
636 * int -> uint conversion rules. Prior to that, there were no implicit
637 * conversions. So it's harmless to apply them universally - no implicit
638 * conversions will exist. If the types don't match, we'll receive false,
639 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
641 * "The operand types must both be signed or unsigned."
643 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
644 !apply_implicit_conversion(type_b
, value_a
, state
)) {
645 _mesa_glsl_error(loc
, state
,
646 "could not implicitly convert operands to "
647 "modulus (%%) operator");
648 return glsl_type::error_type
;
650 type_a
= value_a
->type
;
651 type_b
= value_b
->type
;
653 /* "The operands cannot be vectors of differing size. If one operand is
654 * a scalar and the other vector, then the scalar is applied component-
655 * wise to the vector, resulting in the same type as the vector. If both
656 * are vectors of the same size, the result is computed component-wise."
658 if (type_a
->is_vector()) {
659 if (!type_b
->is_vector()
660 || (type_a
->vector_elements
== type_b
->vector_elements
))
665 /* "The operator modulus (%) is not defined for any other data types
666 * (non-integer types)."
668 _mesa_glsl_error(loc
, state
, "type mismatch");
669 return glsl_type::error_type
;
673 static const struct glsl_type
*
674 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
675 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
677 const glsl_type
*type_a
= value_a
->type
;
678 const glsl_type
*type_b
= value_b
->type
;
680 /* From GLSL 1.50 spec, page 56:
681 * "The relational operators greater than (>), less than (<), greater
682 * than or equal (>=), and less than or equal (<=) operate only on
683 * scalar integer and scalar floating-point expressions."
685 if (!type_a
->is_numeric()
686 || !type_b
->is_numeric()
687 || !type_a
->is_scalar()
688 || !type_b
->is_scalar()) {
689 _mesa_glsl_error(loc
, state
,
690 "operands to relational operators must be scalar and "
692 return glsl_type::error_type
;
695 /* "Either the operands' types must match, or the conversions from
696 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
697 * operand, after which the types must match."
699 if (!apply_implicit_conversion(type_a
, value_b
, state
)
700 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
701 _mesa_glsl_error(loc
, state
,
702 "could not implicitly convert operands to "
703 "relational operator");
704 return glsl_type::error_type
;
706 type_a
= value_a
->type
;
707 type_b
= value_b
->type
;
709 if (type_a
->base_type
!= type_b
->base_type
) {
710 _mesa_glsl_error(loc
, state
, "base type mismatch");
711 return glsl_type::error_type
;
714 /* "The result is scalar Boolean."
716 return glsl_type::bool_type
;
720 * \brief Return the result type of a bit-shift operation.
722 * If the given types to the bit-shift operator are invalid, return
723 * glsl_type::error_type.
725 * \param type_a Type of LHS of bit-shift op
726 * \param type_b Type of RHS of bit-shift op
728 static const struct glsl_type
*
729 shift_result_type(const struct glsl_type
*type_a
,
730 const struct glsl_type
*type_b
,
732 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
734 if (!state
->check_bitwise_operations_allowed(loc
)) {
735 return glsl_type::error_type
;
738 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
740 * "The shift operators (<<) and (>>). For both operators, the operands
741 * must be signed or unsigned integers or integer vectors. One operand
742 * can be signed while the other is unsigned."
744 if (!type_a
->is_integer_32_64()) {
745 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
746 "integer vector", ast_expression::operator_string(op
));
747 return glsl_type::error_type
;
750 if (!type_b
->is_integer_32()) {
751 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
752 "integer vector", ast_expression::operator_string(op
));
753 return glsl_type::error_type
;
756 /* "If the first operand is a scalar, the second operand has to be
759 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
760 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
761 "second must be scalar as well",
762 ast_expression::operator_string(op
));
763 return glsl_type::error_type
;
766 /* If both operands are vectors, check that they have same number of
769 if (type_a
->is_vector() &&
770 type_b
->is_vector() &&
771 type_a
->vector_elements
!= type_b
->vector_elements
) {
772 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
773 "have same number of elements",
774 ast_expression::operator_string(op
));
775 return glsl_type::error_type
;
778 /* "In all cases, the resulting type will be the same type as the left
785 * Returns the innermost array index expression in an rvalue tree.
786 * This is the largest indexing level -- if an array of blocks, then
787 * it is the block index rather than an indexing expression for an
788 * array-typed member of an array of blocks.
791 find_innermost_array_index(ir_rvalue
*rv
)
793 ir_dereference_array
*last
= NULL
;
795 if (rv
->as_dereference_array()) {
796 last
= rv
->as_dereference_array();
798 } else if (rv
->as_dereference_record())
799 rv
= rv
->as_dereference_record()->record
;
800 else if (rv
->as_swizzle())
801 rv
= rv
->as_swizzle()->val
;
807 return last
->array_index
;
813 * Validates that a value can be assigned to a location with a specified type
815 * Validates that \c rhs can be assigned to some location. If the types are
816 * not an exact match but an automatic conversion is possible, \c rhs will be
820 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
821 * Otherwise the actual RHS to be assigned will be returned. This may be
822 * \c rhs, or it may be \c rhs after some type conversion.
825 * In addition to being used for assignments, this function is used to
826 * type-check return values.
829 validate_assignment(struct _mesa_glsl_parse_state
*state
,
830 YYLTYPE loc
, ir_rvalue
*lhs
,
831 ir_rvalue
*rhs
, bool is_initializer
)
833 /* If there is already some error in the RHS, just return it. Anything
834 * else will lead to an avalanche of error message back to the user.
836 if (rhs
->type
->is_error())
839 /* In the Tessellation Control Shader:
840 * If a per-vertex output variable is used as an l-value, it is an error
841 * if the expression indicating the vertex number is not the identifier
844 if (state
->stage
== MESA_SHADER_TESS_CTRL
&& !lhs
->type
->is_error()) {
845 ir_variable
*var
= lhs
->variable_referenced();
846 if (var
&& var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
847 ir_rvalue
*index
= find_innermost_array_index(lhs
);
848 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
849 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
850 _mesa_glsl_error(&loc
, state
,
851 "Tessellation control shader outputs can only "
852 "be indexed by gl_InvocationID");
858 /* If the types are identical, the assignment can trivially proceed.
860 if (rhs
->type
== lhs
->type
)
863 /* If the array element types are the same and the LHS is unsized,
864 * the assignment is okay for initializers embedded in variable
867 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
868 * is handled by ir_dereference::is_lvalue.
870 const glsl_type
*lhs_t
= lhs
->type
;
871 const glsl_type
*rhs_t
= rhs
->type
;
872 bool unsized_array
= false;
873 while(lhs_t
->is_array()) {
875 break; /* the rest of the inner arrays match so break out early */
876 if (!rhs_t
->is_array()) {
877 unsized_array
= false;
878 break; /* number of dimensions mismatch */
880 if (lhs_t
->length
== rhs_t
->length
) {
881 lhs_t
= lhs_t
->fields
.array
;
882 rhs_t
= rhs_t
->fields
.array
;
884 } else if (lhs_t
->is_unsized_array()) {
885 unsized_array
= true;
887 unsized_array
= false;
888 break; /* sized array mismatch */
890 lhs_t
= lhs_t
->fields
.array
;
891 rhs_t
= rhs_t
->fields
.array
;
894 if (is_initializer
) {
895 if (rhs
->type
->get_scalar_type() == lhs
->type
->get_scalar_type())
898 _mesa_glsl_error(&loc
, state
,
899 "implicitly sized arrays cannot be assigned");
904 /* Check for implicit conversion in GLSL 1.20 */
905 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
906 if (rhs
->type
== lhs
->type
)
910 _mesa_glsl_error(&loc
, state
,
911 "%s of type %s cannot be assigned to "
912 "variable of type %s",
913 is_initializer
? "initializer" : "value",
914 rhs
->type
->name
, lhs
->type
->name
);
920 mark_whole_array_access(ir_rvalue
*access
)
922 ir_dereference_variable
*deref
= access
->as_dereference_variable();
924 if (deref
&& deref
->var
) {
925 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
930 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
931 const char *non_lvalue_description
,
932 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
933 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
938 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
940 ir_variable
*lhs_var
= lhs
->variable_referenced();
942 lhs_var
->data
.assigned
= true;
944 if (!error_emitted
) {
945 if (non_lvalue_description
!= NULL
) {
946 _mesa_glsl_error(&lhs_loc
, state
,
948 non_lvalue_description
);
949 error_emitted
= true;
950 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
951 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
952 lhs_var
->data
.memory_read_only
))) {
953 /* We can have memory_read_only set on both images and buffer variables,
954 * but in the former there is a distinction between assignments to
955 * the variable itself (read_only) and to the memory they point to
956 * (memory_read_only), while in the case of buffer variables there is
957 * no such distinction, that is why this check here is limited to
958 * buffer variables alone.
960 _mesa_glsl_error(&lhs_loc
, state
,
961 "assignment to read-only variable '%s'",
963 error_emitted
= true;
964 } else if (lhs
->type
->is_array() &&
965 !state
->check_version(120, 300, &lhs_loc
,
966 "whole array assignment forbidden")) {
967 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
969 * "Other binary or unary expressions, non-dereferenced
970 * arrays, function names, swizzles with repeated fields,
971 * and constants cannot be l-values."
973 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
975 error_emitted
= true;
976 } else if (!lhs
->is_lvalue(state
)) {
977 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
978 error_emitted
= true;
983 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
984 if (new_rhs
!= NULL
) {
987 /* If the LHS array was not declared with a size, it takes it size from
988 * the RHS. If the LHS is an l-value and a whole array, it must be a
989 * dereference of a variable. Any other case would require that the LHS
990 * is either not an l-value or not a whole array.
992 if (lhs
->type
->is_unsized_array()) {
993 ir_dereference
*const d
= lhs
->as_dereference();
997 ir_variable
*const var
= d
->variable_referenced();
1001 if (var
->data
.max_array_access
>= rhs
->type
->array_size()) {
1002 /* FINISHME: This should actually log the location of the RHS. */
1003 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
1005 var
->data
.max_array_access
);
1008 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
1009 rhs
->type
->array_size());
1010 d
->type
= var
->type
;
1012 if (lhs
->type
->is_array()) {
1013 mark_whole_array_access(rhs
);
1014 mark_whole_array_access(lhs
);
1017 error_emitted
= true;
1020 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
1021 * but not post_inc) need the converted assigned value as an rvalue
1022 * to handle things like:
1028 if (!error_emitted
) {
1029 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1031 instructions
->push_tail(var
);
1032 instructions
->push_tail(assign(var
, rhs
));
1034 ir_dereference_variable
*deref_var
=
1035 new(ctx
) ir_dereference_variable(var
);
1036 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1037 rvalue
= new(ctx
) ir_dereference_variable(var
);
1039 rvalue
= ir_rvalue::error_value(ctx
);
1041 *out_rvalue
= rvalue
;
1044 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1048 return error_emitted
;
1052 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1054 void *ctx
= ralloc_parent(lvalue
);
1057 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1059 instructions
->push_tail(var
);
1061 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1064 return new(ctx
) ir_dereference_variable(var
);
1069 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1071 (void) instructions
;
1078 ast_node::has_sequence_subexpression() const
1084 ast_node::set_is_lhs(bool /* new_value */)
1089 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1090 struct _mesa_glsl_parse_state
*state
)
1092 (void)hir(instructions
, state
);
1096 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1097 struct _mesa_glsl_parse_state
*state
)
1099 (void)hir(instructions
, state
);
1103 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1106 ir_rvalue
*cmp
= NULL
;
1108 if (operation
== ir_binop_all_equal
)
1109 join_op
= ir_binop_logic_and
;
1111 join_op
= ir_binop_logic_or
;
1113 switch (op0
->type
->base_type
) {
1114 case GLSL_TYPE_FLOAT
:
1115 case GLSL_TYPE_FLOAT16
:
1116 case GLSL_TYPE_UINT
:
1118 case GLSL_TYPE_BOOL
:
1119 case GLSL_TYPE_DOUBLE
:
1120 case GLSL_TYPE_UINT64
:
1121 case GLSL_TYPE_INT64
:
1122 case GLSL_TYPE_UINT16
:
1123 case GLSL_TYPE_INT16
:
1124 case GLSL_TYPE_UINT8
:
1125 case GLSL_TYPE_INT8
:
1126 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1128 case GLSL_TYPE_ARRAY
: {
1129 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1130 ir_rvalue
*e0
, *e1
, *result
;
1132 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1133 new(mem_ctx
) ir_constant(i
));
1134 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1135 new(mem_ctx
) ir_constant(i
));
1136 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1139 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1145 mark_whole_array_access(op0
);
1146 mark_whole_array_access(op1
);
1150 case GLSL_TYPE_STRUCT
: {
1151 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1152 ir_rvalue
*e0
, *e1
, *result
;
1153 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1155 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1157 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1159 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1162 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1170 case GLSL_TYPE_ERROR
:
1171 case GLSL_TYPE_VOID
:
1172 case GLSL_TYPE_SAMPLER
:
1173 case GLSL_TYPE_IMAGE
:
1174 case GLSL_TYPE_INTERFACE
:
1175 case GLSL_TYPE_ATOMIC_UINT
:
1176 case GLSL_TYPE_SUBROUTINE
:
1177 case GLSL_TYPE_FUNCTION
:
1178 /* I assume a comparison of a struct containing a sampler just
1179 * ignores the sampler present in the type.
1185 cmp
= new(mem_ctx
) ir_constant(true);
1190 /* For logical operations, we want to ensure that the operands are
1191 * scalar booleans. If it isn't, emit an error and return a constant
1192 * boolean to avoid triggering cascading error messages.
1195 get_scalar_boolean_operand(exec_list
*instructions
,
1196 struct _mesa_glsl_parse_state
*state
,
1197 ast_expression
*parent_expr
,
1199 const char *operand_name
,
1200 bool *error_emitted
)
1202 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1204 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1206 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1209 if (!*error_emitted
) {
1210 YYLTYPE loc
= expr
->get_location();
1211 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1213 parent_expr
->operator_string(parent_expr
->oper
));
1214 *error_emitted
= true;
1217 return new(ctx
) ir_constant(true);
1221 * If name refers to a builtin array whose maximum allowed size is less than
1222 * size, report an error and return true. Otherwise return false.
1225 check_builtin_array_max_size(const char *name
, unsigned size
,
1226 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1228 if ((strcmp("gl_TexCoord", name
) == 0)
1229 && (size
> state
->Const
.MaxTextureCoords
)) {
1230 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1232 * "The size [of gl_TexCoord] can be at most
1233 * gl_MaxTextureCoords."
1235 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1236 "be larger than gl_MaxTextureCoords (%u)",
1237 state
->Const
.MaxTextureCoords
);
1238 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1239 state
->clip_dist_size
= size
;
1240 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1241 /* From section 7.1 (Vertex Shader Special Variables) of the
1244 * "The gl_ClipDistance array is predeclared as unsized and
1245 * must be sized by the shader either redeclaring it with a
1246 * size or indexing it only with integral constant
1247 * expressions. ... The size can be at most
1248 * gl_MaxClipDistances."
1250 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1251 "be larger than gl_MaxClipDistances (%u)",
1252 state
->Const
.MaxClipPlanes
);
1254 } else if (strcmp("gl_CullDistance", name
) == 0) {
1255 state
->cull_dist_size
= size
;
1256 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1257 /* From the ARB_cull_distance spec:
1259 * "The gl_CullDistance array is predeclared as unsized and
1260 * must be sized by the shader either redeclaring it with
1261 * a size or indexing it only with integral constant
1262 * expressions. The size determines the number and set of
1263 * enabled cull distances and can be at most
1264 * gl_MaxCullDistances."
1266 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1267 "be larger than gl_MaxCullDistances (%u)",
1268 state
->Const
.MaxClipPlanes
);
1274 * Create the constant 1, of a which is appropriate for incrementing and
1275 * decrementing values of the given GLSL type. For example, if type is vec4,
1276 * this creates a constant value of 1.0 having type float.
1278 * If the given type is invalid for increment and decrement operators, return
1279 * a floating point 1--the error will be detected later.
1282 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1284 switch (type
->base_type
) {
1285 case GLSL_TYPE_UINT
:
1286 return new(ctx
) ir_constant((unsigned) 1);
1288 return new(ctx
) ir_constant(1);
1289 case GLSL_TYPE_UINT64
:
1290 return new(ctx
) ir_constant((uint64_t) 1);
1291 case GLSL_TYPE_INT64
:
1292 return new(ctx
) ir_constant((int64_t) 1);
1294 case GLSL_TYPE_FLOAT
:
1295 return new(ctx
) ir_constant(1.0f
);
1300 ast_expression::hir(exec_list
*instructions
,
1301 struct _mesa_glsl_parse_state
*state
)
1303 return do_hir(instructions
, state
, true);
1307 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1308 struct _mesa_glsl_parse_state
*state
)
1310 do_hir(instructions
, state
, false);
1314 ast_expression::set_is_lhs(bool new_value
)
1316 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1317 * if we lack an identifier we can just skip it.
1319 if (this->primary_expression
.identifier
== NULL
)
1322 this->is_lhs
= new_value
;
1324 /* We need to go through the subexpressions tree to cover cases like
1325 * ast_field_selection
1327 if (this->subexpressions
[0] != NULL
)
1328 this->subexpressions
[0]->set_is_lhs(new_value
);
1332 ast_expression::do_hir(exec_list
*instructions
,
1333 struct _mesa_glsl_parse_state
*state
,
1337 static const int operations
[AST_NUM_OPERATORS
] = {
1338 -1, /* ast_assign doesn't convert to ir_expression. */
1339 -1, /* ast_plus doesn't convert to ir_expression. */
1349 ir_binop_less
, /* This is correct. See the ast_greater case below. */
1350 ir_binop_gequal
, /* This is correct. See the ast_lequal case below. */
1353 ir_binop_any_nequal
,
1363 /* Note: The following block of expression types actually convert
1364 * to multiple IR instructions.
1366 ir_binop_mul
, /* ast_mul_assign */
1367 ir_binop_div
, /* ast_div_assign */
1368 ir_binop_mod
, /* ast_mod_assign */
1369 ir_binop_add
, /* ast_add_assign */
1370 ir_binop_sub
, /* ast_sub_assign */
1371 ir_binop_lshift
, /* ast_ls_assign */
1372 ir_binop_rshift
, /* ast_rs_assign */
1373 ir_binop_bit_and
, /* ast_and_assign */
1374 ir_binop_bit_xor
, /* ast_xor_assign */
1375 ir_binop_bit_or
, /* ast_or_assign */
1377 -1, /* ast_conditional doesn't convert to ir_expression. */
1378 ir_binop_add
, /* ast_pre_inc. */
1379 ir_binop_sub
, /* ast_pre_dec. */
1380 ir_binop_add
, /* ast_post_inc. */
1381 ir_binop_sub
, /* ast_post_dec. */
1382 -1, /* ast_field_selection doesn't conv to ir_expression. */
1383 -1, /* ast_array_index doesn't convert to ir_expression. */
1384 -1, /* ast_function_call doesn't conv to ir_expression. */
1385 -1, /* ast_identifier doesn't convert to ir_expression. */
1386 -1, /* ast_int_constant doesn't convert to ir_expression. */
1387 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1388 -1, /* ast_float_constant doesn't conv to ir_expression. */
1389 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1390 -1, /* ast_sequence doesn't convert to ir_expression. */
1391 -1, /* ast_aggregate shouldn't ever even get here. */
1393 ir_rvalue
*result
= NULL
;
1395 const struct glsl_type
*type
, *orig_type
;
1396 bool error_emitted
= false;
1399 loc
= this->get_location();
1401 switch (this->oper
) {
1403 unreachable("ast_aggregate: Should never get here.");
1406 this->subexpressions
[0]->set_is_lhs(true);
1407 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1408 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1411 do_assignment(instructions
, state
,
1412 this->subexpressions
[0]->non_lvalue_description
,
1413 op
[0], op
[1], &result
, needs_rvalue
, false,
1414 this->subexpressions
[0]->get_location());
1419 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1421 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1423 error_emitted
= type
->is_error();
1429 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1431 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1433 error_emitted
= type
->is_error();
1435 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1443 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1444 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1446 type
= arithmetic_result_type(op
[0], op
[1],
1447 (this->oper
== ast_mul
),
1449 error_emitted
= type
->is_error();
1451 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1456 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1457 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1459 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1461 assert(operations
[this->oper
] == ir_binop_mod
);
1463 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1465 error_emitted
= type
->is_error();
1470 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1471 error_emitted
= true;
1474 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1475 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1476 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1478 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1480 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1487 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1488 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1490 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1492 /* The relational operators must either generate an error or result
1493 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1495 assert(type
->is_error()
1496 || (type
->is_boolean() && type
->is_scalar()));
1498 /* Like NIR, GLSL IR does not have opcodes for > or <=. Instead, swap
1499 * the arguments and use < or >=.
1501 if (this->oper
== ast_greater
|| this->oper
== ast_lequal
) {
1502 ir_rvalue
*const tmp
= op
[0];
1507 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1509 error_emitted
= type
->is_error();
1514 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1515 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1517 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1519 * "The equality operators equal (==), and not equal (!=)
1520 * operate on all types. They result in a scalar Boolean. If
1521 * the operand types do not match, then there must be a
1522 * conversion from Section 4.1.10 "Implicit Conversions"
1523 * applied to one operand that can make them match, in which
1524 * case this conversion is done."
1527 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1528 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1529 "no operation `%1$s' exists that takes a left-hand "
1530 "operand of type 'void' or a right operand of type "
1531 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1532 error_emitted
= true;
1533 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1534 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1535 || (op
[0]->type
!= op
[1]->type
)) {
1536 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1537 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1538 error_emitted
= true;
1539 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1540 !state
->check_version(120, 300, &loc
,
1541 "array comparisons forbidden")) {
1542 error_emitted
= true;
1543 } else if ((op
[0]->type
->contains_subroutine() ||
1544 op
[1]->type
->contains_subroutine())) {
1545 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1546 error_emitted
= true;
1547 } else if ((op
[0]->type
->contains_opaque() ||
1548 op
[1]->type
->contains_opaque())) {
1549 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1550 error_emitted
= true;
1553 if (error_emitted
) {
1554 result
= new(ctx
) ir_constant(false);
1556 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1557 assert(result
->type
== glsl_type::bool_type
);
1564 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1565 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1566 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1567 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1569 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1573 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1575 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1576 error_emitted
= true;
1579 if (!op
[0]->type
->is_integer_32_64()) {
1580 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1581 error_emitted
= true;
1584 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1585 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1588 case ast_logic_and
: {
1589 exec_list rhs_instructions
;
1590 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1591 "LHS", &error_emitted
);
1592 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1593 "RHS", &error_emitted
);
1595 if (rhs_instructions
.is_empty()) {
1596 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1598 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1601 instructions
->push_tail(tmp
);
1603 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1604 instructions
->push_tail(stmt
);
1606 stmt
->then_instructions
.append_list(&rhs_instructions
);
1607 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1608 ir_assignment
*const then_assign
=
1609 new(ctx
) ir_assignment(then_deref
, op
[1]);
1610 stmt
->then_instructions
.push_tail(then_assign
);
1612 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1613 ir_assignment
*const else_assign
=
1614 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1615 stmt
->else_instructions
.push_tail(else_assign
);
1617 result
= new(ctx
) ir_dereference_variable(tmp
);
1622 case ast_logic_or
: {
1623 exec_list rhs_instructions
;
1624 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1625 "LHS", &error_emitted
);
1626 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1627 "RHS", &error_emitted
);
1629 if (rhs_instructions
.is_empty()) {
1630 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1632 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1635 instructions
->push_tail(tmp
);
1637 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1638 instructions
->push_tail(stmt
);
1640 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1641 ir_assignment
*const then_assign
=
1642 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1643 stmt
->then_instructions
.push_tail(then_assign
);
1645 stmt
->else_instructions
.append_list(&rhs_instructions
);
1646 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1647 ir_assignment
*const else_assign
=
1648 new(ctx
) ir_assignment(else_deref
, op
[1]);
1649 stmt
->else_instructions
.push_tail(else_assign
);
1651 result
= new(ctx
) ir_dereference_variable(tmp
);
1657 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1659 * "The logical binary operators and (&&), or ( | | ), and
1660 * exclusive or (^^). They operate only on two Boolean
1661 * expressions and result in a Boolean expression."
1663 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1665 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1668 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1673 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1674 "operand", &error_emitted
);
1676 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1680 case ast_mul_assign
:
1681 case ast_div_assign
:
1682 case ast_add_assign
:
1683 case ast_sub_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
);
1688 orig_type
= op
[0]->type
;
1690 /* Break out if operand types were not parsed successfully. */
1691 if ((op
[0]->type
== glsl_type::error_type
||
1692 op
[1]->type
== glsl_type::error_type
))
1695 type
= arithmetic_result_type(op
[0], op
[1],
1696 (this->oper
== ast_mul_assign
),
1699 if (type
!= orig_type
) {
1700 _mesa_glsl_error(& loc
, state
,
1701 "could not implicitly convert "
1702 "%s to %s", type
->name
, orig_type
->name
);
1703 type
= glsl_type::error_type
;
1706 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1710 do_assignment(instructions
, state
,
1711 this->subexpressions
[0]->non_lvalue_description
,
1712 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1713 &result
, needs_rvalue
, false,
1714 this->subexpressions
[0]->get_location());
1716 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1717 * explicitly test for this because none of the binary expression
1718 * operators allow array operands either.
1724 case ast_mod_assign
: {
1725 this->subexpressions
[0]->set_is_lhs(true);
1726 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1727 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1729 orig_type
= op
[0]->type
;
1730 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1732 if (type
!= orig_type
) {
1733 _mesa_glsl_error(& loc
, state
,
1734 "could not implicitly convert "
1735 "%s to %s", type
->name
, orig_type
->name
);
1736 type
= glsl_type::error_type
;
1739 assert(operations
[this->oper
] == ir_binop_mod
);
1741 ir_rvalue
*temp_rhs
;
1742 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1746 do_assignment(instructions
, state
,
1747 this->subexpressions
[0]->non_lvalue_description
,
1748 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1749 &result
, needs_rvalue
, false,
1750 this->subexpressions
[0]->get_location());
1755 case ast_rs_assign
: {
1756 this->subexpressions
[0]->set_is_lhs(true);
1757 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1758 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1759 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1761 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1762 type
, op
[0], op
[1]);
1764 do_assignment(instructions
, state
,
1765 this->subexpressions
[0]->non_lvalue_description
,
1766 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1767 &result
, needs_rvalue
, false,
1768 this->subexpressions
[0]->get_location());
1772 case ast_and_assign
:
1773 case ast_xor_assign
:
1774 case ast_or_assign
: {
1775 this->subexpressions
[0]->set_is_lhs(true);
1776 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1777 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1779 orig_type
= op
[0]->type
;
1780 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1782 if (type
!= orig_type
) {
1783 _mesa_glsl_error(& loc
, state
,
1784 "could not implicitly convert "
1785 "%s to %s", type
->name
, orig_type
->name
);
1786 type
= glsl_type::error_type
;
1789 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1790 type
, op
[0], op
[1]);
1792 do_assignment(instructions
, state
,
1793 this->subexpressions
[0]->non_lvalue_description
,
1794 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1795 &result
, needs_rvalue
, false,
1796 this->subexpressions
[0]->get_location());
1800 case ast_conditional
: {
1801 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1803 * "The ternary selection operator (?:). It operates on three
1804 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1805 * first expression, which must result in a scalar Boolean."
1807 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1808 "condition", &error_emitted
);
1810 /* The :? operator is implemented by generating an anonymous temporary
1811 * followed by an if-statement. The last instruction in each branch of
1812 * the if-statement assigns a value to the anonymous temporary. This
1813 * temporary is the r-value of the expression.
1815 exec_list then_instructions
;
1816 exec_list else_instructions
;
1818 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1819 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1821 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1823 * "The second and third expressions can be any type, as
1824 * long their types match, or there is a conversion in
1825 * Section 4.1.10 "Implicit Conversions" that can be applied
1826 * to one of the expressions to make their types match. This
1827 * resulting matching type is the type of the entire
1830 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1831 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1832 || (op
[1]->type
!= op
[2]->type
)) {
1833 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1835 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1836 "operator must have matching types");
1837 error_emitted
= true;
1838 type
= glsl_type::error_type
;
1843 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1845 * "The second and third expressions must be the same type, but can
1846 * be of any type other than an array."
1848 if (type
->is_array() &&
1849 !state
->check_version(120, 300, &loc
,
1850 "second and third operands of ?: operator "
1851 "cannot be arrays")) {
1852 error_emitted
= true;
1855 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1857 * "Except for array indexing, structure member selection, and
1858 * parentheses, opaque variables are not allowed to be operands in
1859 * expressions; such use results in a compile-time error."
1861 if (type
->contains_opaque()) {
1862 if (!(state
->has_bindless() && (type
->is_image() || type
->is_sampler()))) {
1863 _mesa_glsl_error(&loc
, state
, "variables of type %s cannot be "
1864 "operands of the ?: operator", type
->name
);
1865 error_emitted
= true;
1869 ir_constant
*cond_val
= op
[0]->constant_expression_value(ctx
);
1871 if (then_instructions
.is_empty()
1872 && else_instructions
.is_empty()
1873 && cond_val
!= NULL
) {
1874 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1876 /* The copy to conditional_tmp reads the whole array. */
1877 if (type
->is_array()) {
1878 mark_whole_array_access(op
[1]);
1879 mark_whole_array_access(op
[2]);
1882 ir_variable
*const tmp
=
1883 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1884 instructions
->push_tail(tmp
);
1886 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1887 instructions
->push_tail(stmt
);
1889 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1890 ir_dereference
*const then_deref
=
1891 new(ctx
) ir_dereference_variable(tmp
);
1892 ir_assignment
*const then_assign
=
1893 new(ctx
) ir_assignment(then_deref
, op
[1]);
1894 stmt
->then_instructions
.push_tail(then_assign
);
1896 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1897 ir_dereference
*const else_deref
=
1898 new(ctx
) ir_dereference_variable(tmp
);
1899 ir_assignment
*const else_assign
=
1900 new(ctx
) ir_assignment(else_deref
, op
[2]);
1901 stmt
->else_instructions
.push_tail(else_assign
);
1903 result
= new(ctx
) ir_dereference_variable(tmp
);
1910 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1911 ? "pre-increment operation" : "pre-decrement operation";
1913 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1914 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1916 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1918 ir_rvalue
*temp_rhs
;
1919 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1923 do_assignment(instructions
, state
,
1924 this->subexpressions
[0]->non_lvalue_description
,
1925 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1926 &result
, needs_rvalue
, false,
1927 this->subexpressions
[0]->get_location());
1932 case ast_post_dec
: {
1933 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1934 ? "post-increment operation" : "post-decrement operation";
1935 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1936 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1938 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1940 if (error_emitted
) {
1941 result
= ir_rvalue::error_value(ctx
);
1945 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1947 ir_rvalue
*temp_rhs
;
1948 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1951 /* Get a temporary of a copy of the lvalue before it's modified.
1952 * This may get thrown away later.
1954 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1956 ir_rvalue
*junk_rvalue
;
1958 do_assignment(instructions
, state
,
1959 this->subexpressions
[0]->non_lvalue_description
,
1960 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1961 &junk_rvalue
, false, false,
1962 this->subexpressions
[0]->get_location());
1967 case ast_field_selection
:
1968 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1971 case ast_array_index
: {
1972 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1974 /* Getting if an array is being used uninitialized is beyond what we get
1975 * from ir_value.data.assigned. Setting is_lhs as true would force to
1976 * not raise a uninitialized warning when using an array
1978 subexpressions
[0]->set_is_lhs(true);
1979 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1980 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1982 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1985 if (result
->type
->is_error())
1986 error_emitted
= true;
1991 case ast_unsized_array_dim
:
1992 unreachable("ast_unsized_array_dim: Should never get here.");
1994 case ast_function_call
:
1995 /* Should *NEVER* get here. ast_function_call should always be handled
1996 * by ast_function_expression::hir.
1998 unreachable("ast_function_call: handled elsewhere ");
2000 case ast_identifier
: {
2001 /* ast_identifier can appear several places in a full abstract syntax
2002 * tree. This particular use must be at location specified in the grammar
2003 * as 'variable_identifier'.
2006 state
->symbols
->get_variable(this->primary_expression
.identifier
);
2009 /* the identifier might be a subroutine name */
2011 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
2012 var
= state
->symbols
->get_variable(sub_name
);
2013 ralloc_free(sub_name
);
2017 var
->data
.used
= true;
2018 result
= new(ctx
) ir_dereference_variable(var
);
2020 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
2022 && result
->variable_referenced()->data
.assigned
!= true
2023 && !is_gl_identifier(var
->name
)) {
2024 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
2025 this->primary_expression
.identifier
);
2028 /* From the EXT_shader_framebuffer_fetch spec:
2030 * "Unless the GL_EXT_shader_framebuffer_fetch extension has been
2031 * enabled in addition, it's an error to use gl_LastFragData if it
2032 * hasn't been explicitly redeclared with layout(noncoherent)."
2034 if (var
->data
.fb_fetch_output
&& var
->data
.memory_coherent
&&
2035 !state
->EXT_shader_framebuffer_fetch_enable
) {
2036 _mesa_glsl_error(&loc
, state
,
2037 "invalid use of framebuffer fetch output not "
2038 "qualified with layout(noncoherent)");
2042 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
2043 this->primary_expression
.identifier
);
2045 result
= ir_rvalue::error_value(ctx
);
2046 error_emitted
= true;
2051 case ast_int_constant
:
2052 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
2055 case ast_uint_constant
:
2056 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
2059 case ast_float_constant
:
2060 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
2063 case ast_bool_constant
:
2064 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2067 case ast_double_constant
:
2068 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2071 case ast_uint64_constant
:
2072 result
= new(ctx
) ir_constant(this->primary_expression
.uint64_constant
);
2075 case ast_int64_constant
:
2076 result
= new(ctx
) ir_constant(this->primary_expression
.int64_constant
);
2079 case ast_sequence
: {
2080 /* It should not be possible to generate a sequence in the AST without
2081 * any expressions in it.
2083 assert(!this->expressions
.is_empty());
2085 /* The r-value of a sequence is the last expression in the sequence. If
2086 * the other expressions in the sequence do not have side-effects (and
2087 * therefore add instructions to the instruction list), they get dropped
2090 exec_node
*previous_tail
= NULL
;
2091 YYLTYPE previous_operand_loc
= loc
;
2093 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2094 /* If one of the operands of comma operator does not generate any
2095 * code, we want to emit a warning. At each pass through the loop
2096 * previous_tail will point to the last instruction in the stream
2097 * *before* processing the previous operand. Naturally,
2098 * instructions->get_tail_raw() will point to the last instruction in
2099 * the stream *after* processing the previous operand. If the two
2100 * pointers match, then the previous operand had no effect.
2102 * The warning behavior here differs slightly from GCC. GCC will
2103 * only emit a warning if none of the left-hand operands have an
2104 * effect. However, it will emit a warning for each. I believe that
2105 * there are some cases in C (especially with GCC extensions) where
2106 * it is useful to have an intermediate step in a sequence have no
2107 * effect, but I don't think these cases exist in GLSL. Either way,
2108 * it would be a giant hassle to replicate that behavior.
2110 if (previous_tail
== instructions
->get_tail_raw()) {
2111 _mesa_glsl_warning(&previous_operand_loc
, state
,
2112 "left-hand operand of comma expression has "
2116 /* The tail is directly accessed instead of using the get_tail()
2117 * method for performance reasons. get_tail() has extra code to
2118 * return NULL when the list is empty. We don't care about that
2119 * here, so using get_tail_raw() is fine.
2121 previous_tail
= instructions
->get_tail_raw();
2122 previous_operand_loc
= ast
->get_location();
2124 result
= ast
->hir(instructions
, state
);
2127 /* Any errors should have already been emitted in the loop above.
2129 error_emitted
= true;
2133 type
= NULL
; /* use result->type, not type. */
2134 assert(result
!= NULL
|| !needs_rvalue
);
2136 if (result
&& result
->type
->is_error() && !error_emitted
)
2137 _mesa_glsl_error(& loc
, state
, "type mismatch");
2143 ast_expression::has_sequence_subexpression() const
2145 switch (this->oper
) {
2154 return this->subexpressions
[0]->has_sequence_subexpression();
2176 case ast_array_index
:
2177 case ast_mul_assign
:
2178 case ast_div_assign
:
2179 case ast_add_assign
:
2180 case ast_sub_assign
:
2181 case ast_mod_assign
:
2184 case ast_and_assign
:
2185 case ast_xor_assign
:
2187 return this->subexpressions
[0]->has_sequence_subexpression() ||
2188 this->subexpressions
[1]->has_sequence_subexpression();
2190 case ast_conditional
:
2191 return this->subexpressions
[0]->has_sequence_subexpression() ||
2192 this->subexpressions
[1]->has_sequence_subexpression() ||
2193 this->subexpressions
[2]->has_sequence_subexpression();
2198 case ast_field_selection
:
2199 case ast_identifier
:
2200 case ast_int_constant
:
2201 case ast_uint_constant
:
2202 case ast_float_constant
:
2203 case ast_bool_constant
:
2204 case ast_double_constant
:
2205 case ast_int64_constant
:
2206 case ast_uint64_constant
:
2212 case ast_function_call
:
2213 unreachable("should be handled by ast_function_expression::hir");
2215 case ast_unsized_array_dim
:
2216 unreachable("ast_unsized_array_dim: Should never get here.");
2223 ast_expression_statement::hir(exec_list
*instructions
,
2224 struct _mesa_glsl_parse_state
*state
)
2226 /* It is possible to have expression statements that don't have an
2227 * expression. This is the solitary semicolon:
2229 * for (i = 0; i < 5; i++)
2232 * In this case the expression will be NULL. Test for NULL and don't do
2233 * anything in that case.
2235 if (expression
!= NULL
)
2236 expression
->hir_no_rvalue(instructions
, state
);
2238 /* Statements do not have r-values.
2245 ast_compound_statement::hir(exec_list
*instructions
,
2246 struct _mesa_glsl_parse_state
*state
)
2249 state
->symbols
->push_scope();
2251 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2252 ast
->hir(instructions
, state
);
2255 state
->symbols
->pop_scope();
2257 /* Compound statements do not have r-values.
2263 * Evaluate the given exec_node (which should be an ast_node representing
2264 * a single array dimension) and return its integer value.
2267 process_array_size(exec_node
*node
,
2268 struct _mesa_glsl_parse_state
*state
)
2270 void *mem_ctx
= state
;
2272 exec_list dummy_instructions
;
2274 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2277 * Dimensions other than the outermost dimension can by unsized if they
2278 * are immediately sized by a constructor or initializer.
2280 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2283 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2284 YYLTYPE loc
= array_size
->get_location();
2287 _mesa_glsl_error(& loc
, state
,
2288 "array size could not be resolved");
2292 if (!ir
->type
->is_integer_32()) {
2293 _mesa_glsl_error(& loc
, state
,
2294 "array size must be integer type");
2298 if (!ir
->type
->is_scalar()) {
2299 _mesa_glsl_error(& loc
, state
,
2300 "array size must be scalar type");
2304 ir_constant
*const size
= ir
->constant_expression_value(mem_ctx
);
2306 (state
->is_version(120, 300) &&
2307 array_size
->has_sequence_subexpression())) {
2308 _mesa_glsl_error(& loc
, state
, "array size must be a "
2309 "constant valued expression");
2313 if (size
->value
.i
[0] <= 0) {
2314 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2318 assert(size
->type
== ir
->type
);
2320 /* If the array size is const (and we've verified that
2321 * it is) then no instructions should have been emitted
2322 * when we converted it to HIR. If they were emitted,
2323 * then either the array size isn't const after all, or
2324 * we are emitting unnecessary instructions.
2326 assert(dummy_instructions
.is_empty());
2328 return size
->value
.u
[0];
2331 static const glsl_type
*
2332 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2333 ast_array_specifier
*array_specifier
,
2334 struct _mesa_glsl_parse_state
*state
)
2336 const glsl_type
*array_type
= base
;
2338 if (array_specifier
!= NULL
) {
2339 if (base
->is_array()) {
2341 /* From page 19 (page 25) of the GLSL 1.20 spec:
2343 * "Only one-dimensional arrays may be declared."
2345 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2346 return glsl_type::error_type
;
2350 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2351 !node
->is_head_sentinel(); node
= node
->prev
) {
2352 unsigned array_size
= process_array_size(node
, state
);
2353 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2361 precision_qualifier_allowed(const glsl_type
*type
)
2363 /* Precision qualifiers apply to floating point, integer and opaque
2366 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2367 * "Any floating point or any integer declaration can have the type
2368 * preceded by one of these precision qualifiers [...] Literal
2369 * constants do not have precision qualifiers. Neither do Boolean
2372 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2375 * "Precision qualifiers are added for code portability with OpenGL
2376 * ES, not for functionality. They have the same syntax as in OpenGL
2379 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2381 * "uniform lowp sampler2D sampler;
2384 * lowp vec4 col = texture2D (sampler, coord);
2385 * // texture2D returns lowp"
2387 * From this, we infer that GLSL 1.30 (and later) should allow precision
2388 * qualifiers on sampler types just like float and integer types.
2390 const glsl_type
*const t
= type
->without_array();
2392 return (t
->is_float() || t
->is_integer_32() || t
->contains_opaque()) &&
2397 ast_type_specifier::glsl_type(const char **name
,
2398 struct _mesa_glsl_parse_state
*state
) const
2400 const struct glsl_type
*type
;
2402 if (this->type
!= NULL
)
2405 type
= structure
->type
;
2407 type
= state
->symbols
->get_type(this->type_name
);
2408 *name
= this->type_name
;
2410 YYLTYPE loc
= this->get_location();
2411 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2417 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2419 * "The precision statement
2421 * precision precision-qualifier type;
2423 * can be used to establish a default precision qualifier. The type field can
2424 * be either int or float or any of the sampler types, (...) If type is float,
2425 * the directive applies to non-precision-qualified floating point type
2426 * (scalar, vector, and matrix) declarations. If type is int, the directive
2427 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2428 * and unsigned) declarations."
2430 * We use the symbol table to keep the values of the default precisions for
2431 * each 'type' in each scope and we use the 'type' string from the precision
2432 * statement as key in the symbol table. When we want to retrieve the default
2433 * precision associated with a given glsl_type we need to know the type string
2434 * associated with it. This is what this function returns.
2437 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2439 switch (type
->base_type
) {
2440 case GLSL_TYPE_FLOAT
:
2442 case GLSL_TYPE_UINT
:
2445 case GLSL_TYPE_ATOMIC_UINT
:
2446 return "atomic_uint";
2447 case GLSL_TYPE_IMAGE
:
2449 case GLSL_TYPE_SAMPLER
: {
2450 const unsigned type_idx
=
2451 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2452 const unsigned offset
= type
->is_sampler() ? 0 : 4;
2453 assert(type_idx
< 4);
2454 switch (type
->sampled_type
) {
2455 case GLSL_TYPE_FLOAT
:
2456 switch (type
->sampler_dimensionality
) {
2457 case GLSL_SAMPLER_DIM_1D
: {
2458 assert(type
->is_sampler());
2459 static const char *const names
[4] = {
2460 "sampler1D", "sampler1DArray",
2461 "sampler1DShadow", "sampler1DArrayShadow"
2463 return names
[type_idx
];
2465 case GLSL_SAMPLER_DIM_2D
: {
2466 static const char *const names
[8] = {
2467 "sampler2D", "sampler2DArray",
2468 "sampler2DShadow", "sampler2DArrayShadow",
2469 "image2D", "image2DArray", NULL
, NULL
2471 return names
[offset
+ type_idx
];
2473 case GLSL_SAMPLER_DIM_3D
: {
2474 static const char *const names
[8] = {
2475 "sampler3D", NULL
, NULL
, NULL
,
2476 "image3D", NULL
, NULL
, NULL
2478 return names
[offset
+ type_idx
];
2480 case GLSL_SAMPLER_DIM_CUBE
: {
2481 static const char *const names
[8] = {
2482 "samplerCube", "samplerCubeArray",
2483 "samplerCubeShadow", "samplerCubeArrayShadow",
2484 "imageCube", NULL
, NULL
, NULL
2486 return names
[offset
+ type_idx
];
2488 case GLSL_SAMPLER_DIM_MS
: {
2489 assert(type
->is_sampler());
2490 static const char *const names
[4] = {
2491 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2493 return names
[type_idx
];
2495 case GLSL_SAMPLER_DIM_RECT
: {
2496 assert(type
->is_sampler());
2497 static const char *const names
[4] = {
2498 "samplerRect", NULL
, "samplerRectShadow", NULL
2500 return names
[type_idx
];
2502 case GLSL_SAMPLER_DIM_BUF
: {
2503 static const char *const names
[8] = {
2504 "samplerBuffer", NULL
, NULL
, NULL
,
2505 "imageBuffer", NULL
, NULL
, NULL
2507 return names
[offset
+ type_idx
];
2509 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2510 assert(type
->is_sampler());
2511 static const char *const names
[4] = {
2512 "samplerExternalOES", NULL
, NULL
, NULL
2514 return names
[type_idx
];
2517 unreachable("Unsupported sampler/image dimensionality");
2518 } /* sampler/image float dimensionality */
2521 switch (type
->sampler_dimensionality
) {
2522 case GLSL_SAMPLER_DIM_1D
: {
2523 assert(type
->is_sampler());
2524 static const char *const names
[4] = {
2525 "isampler1D", "isampler1DArray", NULL
, NULL
2527 return names
[type_idx
];
2529 case GLSL_SAMPLER_DIM_2D
: {
2530 static const char *const names
[8] = {
2531 "isampler2D", "isampler2DArray", NULL
, NULL
,
2532 "iimage2D", "iimage2DArray", NULL
, NULL
2534 return names
[offset
+ type_idx
];
2536 case GLSL_SAMPLER_DIM_3D
: {
2537 static const char *const names
[8] = {
2538 "isampler3D", NULL
, NULL
, NULL
,
2539 "iimage3D", NULL
, NULL
, NULL
2541 return names
[offset
+ type_idx
];
2543 case GLSL_SAMPLER_DIM_CUBE
: {
2544 static const char *const names
[8] = {
2545 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2546 "iimageCube", NULL
, NULL
, NULL
2548 return names
[offset
+ type_idx
];
2550 case GLSL_SAMPLER_DIM_MS
: {
2551 assert(type
->is_sampler());
2552 static const char *const names
[4] = {
2553 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2555 return names
[type_idx
];
2557 case GLSL_SAMPLER_DIM_RECT
: {
2558 assert(type
->is_sampler());
2559 static const char *const names
[4] = {
2560 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2562 return names
[type_idx
];
2564 case GLSL_SAMPLER_DIM_BUF
: {
2565 static const char *const names
[8] = {
2566 "isamplerBuffer", NULL
, NULL
, NULL
,
2567 "iimageBuffer", NULL
, NULL
, NULL
2569 return names
[offset
+ type_idx
];
2572 unreachable("Unsupported isampler/iimage dimensionality");
2573 } /* sampler/image int dimensionality */
2575 case GLSL_TYPE_UINT
:
2576 switch (type
->sampler_dimensionality
) {
2577 case GLSL_SAMPLER_DIM_1D
: {
2578 assert(type
->is_sampler());
2579 static const char *const names
[4] = {
2580 "usampler1D", "usampler1DArray", NULL
, NULL
2582 return names
[type_idx
];
2584 case GLSL_SAMPLER_DIM_2D
: {
2585 static const char *const names
[8] = {
2586 "usampler2D", "usampler2DArray", NULL
, NULL
,
2587 "uimage2D", "uimage2DArray", NULL
, NULL
2589 return names
[offset
+ type_idx
];
2591 case GLSL_SAMPLER_DIM_3D
: {
2592 static const char *const names
[8] = {
2593 "usampler3D", NULL
, NULL
, NULL
,
2594 "uimage3D", NULL
, NULL
, NULL
2596 return names
[offset
+ type_idx
];
2598 case GLSL_SAMPLER_DIM_CUBE
: {
2599 static const char *const names
[8] = {
2600 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2601 "uimageCube", NULL
, NULL
, NULL
2603 return names
[offset
+ type_idx
];
2605 case GLSL_SAMPLER_DIM_MS
: {
2606 assert(type
->is_sampler());
2607 static const char *const names
[4] = {
2608 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2610 return names
[type_idx
];
2612 case GLSL_SAMPLER_DIM_RECT
: {
2613 assert(type
->is_sampler());
2614 static const char *const names
[4] = {
2615 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2617 return names
[type_idx
];
2619 case GLSL_SAMPLER_DIM_BUF
: {
2620 static const char *const names
[8] = {
2621 "usamplerBuffer", NULL
, NULL
, NULL
,
2622 "uimageBuffer", NULL
, NULL
, NULL
2624 return names
[offset
+ type_idx
];
2627 unreachable("Unsupported usampler/uimage dimensionality");
2628 } /* sampler/image uint dimensionality */
2631 unreachable("Unsupported sampler/image type");
2632 } /* sampler/image type */
2634 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2637 unreachable("Unsupported type");
2642 select_gles_precision(unsigned qual_precision
,
2643 const glsl_type
*type
,
2644 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2646 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2647 * In GLES we take the precision from the type qualifier if present,
2648 * otherwise, if the type of the variable allows precision qualifiers at
2649 * all, we look for the default precision qualifier for that type in the
2652 assert(state
->es_shader
);
2654 unsigned precision
= GLSL_PRECISION_NONE
;
2655 if (qual_precision
) {
2656 precision
= qual_precision
;
2657 } else if (precision_qualifier_allowed(type
)) {
2658 const char *type_name
=
2659 get_type_name_for_precision_qualifier(type
->without_array());
2660 assert(type_name
!= NULL
);
2663 state
->symbols
->get_default_precision_qualifier(type_name
);
2664 if (precision
== ast_precision_none
) {
2665 _mesa_glsl_error(loc
, state
,
2666 "No precision specified in this scope for type `%s'",
2672 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2674 * "The default precision of all atomic types is highp. It is an error to
2675 * declare an atomic type with a different precision or to specify the
2676 * default precision for an atomic type to be lowp or mediump."
2678 if (type
->is_atomic_uint() && precision
!= ast_precision_high
) {
2679 _mesa_glsl_error(loc
, state
,
2680 "atomic_uint can only have highp precision qualifier");
2687 ast_fully_specified_type::glsl_type(const char **name
,
2688 struct _mesa_glsl_parse_state
*state
) const
2690 return this->specifier
->glsl_type(name
, state
);
2694 * Determine whether a toplevel variable declaration declares a varying. This
2695 * function operates by examining the variable's mode and the shader target,
2696 * so it correctly identifies linkage variables regardless of whether they are
2697 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2699 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2700 * this function will produce undefined results.
2703 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2706 case MESA_SHADER_VERTEX
:
2707 return var
->data
.mode
== ir_var_shader_out
;
2708 case MESA_SHADER_FRAGMENT
:
2709 return var
->data
.mode
== ir_var_shader_in
||
2710 (var
->data
.mode
== ir_var_system_value
&&
2711 var
->data
.location
== SYSTEM_VALUE_FRAG_COORD
);
2713 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2718 is_allowed_invariant(ir_variable
*var
, struct _mesa_glsl_parse_state
*state
)
2720 if (is_varying_var(var
, state
->stage
))
2723 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
2724 * "Only variables output from a vertex shader can be candidates
2727 if (!state
->is_version(130, 100))
2731 * Later specs remove this language - so allowed invariant
2732 * on fragment shader outputs as well.
2734 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
2735 var
->data
.mode
== ir_var_shader_out
)
2741 * Matrix layout qualifiers are only allowed on certain types
2744 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2746 const glsl_type
*type
,
2749 if (var
&& !var
->is_in_buffer_block()) {
2750 /* Layout qualifiers may only apply to interface blocks and fields in
2753 _mesa_glsl_error(loc
, state
,
2754 "uniform block layout qualifiers row_major and "
2755 "column_major may not be applied to variables "
2756 "outside of uniform blocks");
2757 } else if (!type
->without_array()->is_matrix()) {
2758 /* The OpenGL ES 3.0 conformance tests did not originally allow
2759 * matrix layout qualifiers on non-matrices. However, the OpenGL
2760 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2761 * amended to specifically allow these layouts on all types. Emit
2762 * a warning so that people know their code may not be portable.
2764 _mesa_glsl_warning(loc
, state
,
2765 "uniform block layout qualifiers row_major and "
2766 "column_major applied to non-matrix types may "
2767 "be rejected by older compilers");
2772 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2773 struct _mesa_glsl_parse_state
*state
,
2774 unsigned xfb_buffer
) {
2775 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2776 _mesa_glsl_error(loc
, state
,
2777 "invalid xfb_buffer specified %d is larger than "
2778 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2780 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2787 /* From the ARB_enhanced_layouts spec:
2789 * "Variables and block members qualified with *xfb_offset* can be
2790 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2791 * The offset must be a multiple of the size of the first component of
2792 * the first qualified variable or block member, or a compile-time error
2793 * results. Further, if applied to an aggregate containing a double,
2794 * the offset must also be a multiple of 8, and the space taken in the
2795 * buffer will be a multiple of 8.
2798 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2799 struct _mesa_glsl_parse_state
*state
,
2800 int xfb_offset
, const glsl_type
*type
,
2801 unsigned component_size
) {
2802 const glsl_type
*t_without_array
= type
->without_array();
2804 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2805 _mesa_glsl_error(loc
, state
,
2806 "xfb_offset can't be used with unsized arrays.");
2810 /* Make sure nested structs don't contain unsized arrays, and validate
2811 * any xfb_offsets on interface members.
2813 if (t_without_array
->is_struct() || t_without_array
->is_interface())
2814 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2815 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2817 /* When the interface block doesn't have an xfb_offset qualifier then
2818 * we apply the component size rules at the member level.
2820 if (xfb_offset
== -1)
2821 component_size
= member_t
->contains_double() ? 8 : 4;
2823 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2824 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2828 /* Nested structs or interface block without offset may not have had an
2829 * offset applied yet so return.
2831 if (xfb_offset
== -1) {
2835 if (xfb_offset
% component_size
) {
2836 _mesa_glsl_error(loc
, state
,
2837 "invalid qualifier xfb_offset=%d must be a multiple "
2838 "of the first component size of the first qualified "
2839 "variable or block member. Or double if an aggregate "
2840 "that contains a double (%d).",
2841 xfb_offset
, component_size
);
2849 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2852 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2853 _mesa_glsl_error(loc
, state
,
2854 "invalid stream specified %d is larger than "
2855 "MAX_VERTEX_STREAMS - 1 (%d).",
2856 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2864 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2867 const glsl_type
*type
,
2868 const ast_type_qualifier
*qual
)
2870 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2871 _mesa_glsl_error(loc
, state
,
2872 "the \"binding\" qualifier only applies to uniforms and "
2873 "shader storage buffer objects");
2877 unsigned qual_binding
;
2878 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2883 const struct gl_context
*const ctx
= state
->ctx
;
2884 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2885 unsigned max_index
= qual_binding
+ elements
- 1;
2886 const glsl_type
*base_type
= type
->without_array();
2888 if (base_type
->is_interface()) {
2889 /* UBOs. From page 60 of the GLSL 4.20 specification:
2890 * "If the binding point for any uniform block instance is less than zero,
2891 * or greater than or equal to the implementation-dependent maximum
2892 * number of uniform buffer bindings, a compilation error will occur.
2893 * When the binding identifier is used with a uniform block instanced as
2894 * an array of size N, all elements of the array from binding through
2895 * binding + N – 1 must be within this range."
2897 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2899 if (qual
->flags
.q
.uniform
&&
2900 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2901 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2902 "the maximum number of UBO binding points (%d)",
2903 qual_binding
, elements
,
2904 ctx
->Const
.MaxUniformBufferBindings
);
2908 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2909 * "If the binding point for any uniform or shader storage block instance
2910 * is less than zero, or greater than or equal to the
2911 * implementation-dependent maximum number of uniform buffer bindings, a
2912 * compile-time error will occur. When the binding identifier is used
2913 * with a uniform or shader storage block instanced as an array of size
2914 * N, all elements of the array from binding through binding + N – 1 must
2915 * be within this range."
2917 if (qual
->flags
.q
.buffer
&&
2918 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2919 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2920 "the maximum number of SSBO binding points (%d)",
2921 qual_binding
, elements
,
2922 ctx
->Const
.MaxShaderStorageBufferBindings
);
2925 } else if (base_type
->is_sampler()) {
2926 /* Samplers. From page 63 of the GLSL 4.20 specification:
2927 * "If the binding is less than zero, or greater than or equal to the
2928 * implementation-dependent maximum supported number of units, a
2929 * compilation error will occur. When the binding identifier is used
2930 * with an array of size N, all elements of the array from binding
2931 * through binding + N - 1 must be within this range."
2933 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2935 if (max_index
>= limit
) {
2936 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2937 "exceeds the maximum number of texture image units "
2938 "(%u)", qual_binding
, elements
, limit
);
2942 } else if (base_type
->contains_atomic()) {
2943 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2944 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2945 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2946 "maximum number of atomic counter buffer bindings "
2947 "(%u)", qual_binding
,
2948 ctx
->Const
.MaxAtomicBufferBindings
);
2952 } else if ((state
->is_version(420, 310) ||
2953 state
->ARB_shading_language_420pack_enable
) &&
2954 base_type
->is_image()) {
2955 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2956 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2957 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2958 "maximum number of image units (%d)", max_index
,
2959 ctx
->Const
.MaxImageUnits
);
2964 _mesa_glsl_error(loc
, state
,
2965 "the \"binding\" qualifier only applies to uniform "
2966 "blocks, storage blocks, opaque variables, or arrays "
2971 var
->data
.explicit_binding
= true;
2972 var
->data
.binding
= qual_binding
;
2978 validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state
*state
,
2980 const glsl_interp_mode interpolation
,
2981 const struct glsl_type
*var_type
,
2982 ir_variable_mode mode
)
2984 if (state
->stage
!= MESA_SHADER_FRAGMENT
||
2985 interpolation
== INTERP_MODE_FLAT
||
2986 mode
!= ir_var_shader_in
)
2989 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2990 * so must integer vertex outputs.
2992 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2993 * "Fragment shader inputs that are signed or unsigned integers or
2994 * integer vectors must be qualified with the interpolation qualifier
2997 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2998 * "Fragment shader inputs that are, or contain, signed or unsigned
2999 * integers or integer vectors must be qualified with the
3000 * interpolation qualifier flat."
3002 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3003 * "Vertex shader outputs that are, or contain, signed or unsigned
3004 * integers or integer vectors must be qualified with the
3005 * interpolation qualifier flat."
3007 * Note that prior to GLSL 1.50, this requirement applied to vertex
3008 * outputs rather than fragment inputs. That creates problems in the
3009 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3010 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3011 * apply the restriction to both vertex outputs and fragment inputs.
3013 * Note also that the desktop GLSL specs are missing the text "or
3014 * contain"; this is presumably an oversight, since there is no
3015 * reasonable way to interpolate a fragment shader input that contains
3016 * an integer. See Khronos bug #15671.
3018 if ((state
->is_version(130, 300) || state
->EXT_gpu_shader4_enable
)
3019 && var_type
->contains_integer()) {
3020 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3021 "an integer, then it must be qualified with 'flat'");
3024 /* Double fragment inputs must be qualified with 'flat'.
3026 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
3027 * "This extension does not support interpolation of double-precision
3028 * values; doubles used as fragment shader inputs must be qualified as
3031 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
3032 * "Fragment shader inputs that are signed or unsigned integers, integer
3033 * vectors, or any double-precision floating-point type must be
3034 * qualified with the interpolation qualifier flat."
3036 * Note that the GLSL specs are missing the text "or contain"; this is
3037 * presumably an oversight. See Khronos bug #15671.
3039 * The 'double' type does not exist in GLSL ES so far.
3041 if (state
->has_double()
3042 && var_type
->contains_double()) {
3043 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3044 "a double, then it must be qualified with 'flat'");
3047 /* Bindless sampler/image fragment inputs must be qualified with 'flat'.
3049 * From section 4.3.4 of the ARB_bindless_texture spec:
3051 * "(modify last paragraph, p. 35, allowing samplers and images as
3052 * fragment shader inputs) ... Fragment inputs can only be signed and
3053 * unsigned integers and integer vectors, floating point scalars,
3054 * floating-point vectors, matrices, sampler and image types, or arrays
3055 * or structures of these. Fragment shader inputs that are signed or
3056 * unsigned integers, integer vectors, or any double-precision floating-
3057 * point type, or any sampler or image type must be qualified with the
3058 * interpolation qualifier "flat"."
3060 if (state
->has_bindless()
3061 && (var_type
->contains_sampler() || var_type
->contains_image())) {
3062 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3063 "a bindless sampler (or image), then it must be "
3064 "qualified with 'flat'");
3069 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
3071 const glsl_interp_mode interpolation
,
3072 const struct ast_type_qualifier
*qual
,
3073 const struct glsl_type
*var_type
,
3074 ir_variable_mode mode
)
3076 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
3077 * not to vertex shader inputs nor fragment shader outputs.
3079 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3080 * "Outputs from a vertex shader (out) and inputs to a fragment
3081 * shader (in) can be further qualified with one or more of these
3082 * interpolation qualifiers"
3084 * "These interpolation qualifiers may only precede the qualifiers in,
3085 * centroid in, out, or centroid out in a declaration. They do not apply
3086 * to the deprecated storage qualifiers varying or centroid
3087 * varying. They also do not apply to inputs into a vertex shader or
3088 * outputs from a fragment shader."
3090 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
3091 * "Outputs from a shader (out) and inputs to a shader (in) can be
3092 * further qualified with one of these interpolation qualifiers."
3094 * "These interpolation qualifiers may only precede the qualifiers
3095 * in, centroid in, out, or centroid out in a declaration. They do
3096 * not apply to inputs into a vertex shader or outputs from a
3099 if ((state
->is_version(130, 300) || state
->EXT_gpu_shader4_enable
)
3100 && interpolation
!= INTERP_MODE_NONE
) {
3101 const char *i
= interpolation_string(interpolation
);
3102 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
3103 _mesa_glsl_error(loc
, state
,
3104 "interpolation qualifier `%s' can only be applied to "
3105 "shader inputs or outputs.", i
);
3107 switch (state
->stage
) {
3108 case MESA_SHADER_VERTEX
:
3109 if (mode
== ir_var_shader_in
) {
3110 _mesa_glsl_error(loc
, state
,
3111 "interpolation qualifier '%s' cannot be applied to "
3112 "vertex shader inputs", i
);
3115 case MESA_SHADER_FRAGMENT
:
3116 if (mode
== ir_var_shader_out
) {
3117 _mesa_glsl_error(loc
, state
,
3118 "interpolation qualifier '%s' cannot be applied to "
3119 "fragment shader outputs", i
);
3127 /* Interpolation qualifiers cannot be applied to 'centroid' and
3128 * 'centroid varying'.
3130 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3131 * "interpolation qualifiers may only precede the qualifiers in,
3132 * centroid in, out, or centroid out in a declaration. They do not apply
3133 * to the deprecated storage qualifiers varying or centroid varying."
3135 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3137 * GL_EXT_gpu_shader4 allows this.
3139 if (state
->is_version(130, 0) && !state
->EXT_gpu_shader4_enable
3140 && interpolation
!= INTERP_MODE_NONE
3141 && qual
->flags
.q
.varying
) {
3143 const char *i
= interpolation_string(interpolation
);
3145 if (qual
->flags
.q
.centroid
)
3146 s
= "centroid varying";
3150 _mesa_glsl_error(loc
, state
,
3151 "qualifier '%s' cannot be applied to the "
3152 "deprecated storage qualifier '%s'", i
, s
);
3155 validate_fragment_flat_interpolation_input(state
, loc
, interpolation
,
3159 static glsl_interp_mode
3160 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3161 const struct glsl_type
*var_type
,
3162 ir_variable_mode mode
,
3163 struct _mesa_glsl_parse_state
*state
,
3166 glsl_interp_mode interpolation
;
3167 if (qual
->flags
.q
.flat
)
3168 interpolation
= INTERP_MODE_FLAT
;
3169 else if (qual
->flags
.q
.noperspective
)
3170 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3171 else if (qual
->flags
.q
.smooth
)
3172 interpolation
= INTERP_MODE_SMOOTH
;
3174 interpolation
= INTERP_MODE_NONE
;
3176 validate_interpolation_qualifier(state
, loc
,
3178 qual
, var_type
, mode
);
3180 return interpolation
;
3185 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3187 struct _mesa_glsl_parse_state
*state
,
3192 unsigned qual_location
;
3193 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3198 /* Checks for GL_ARB_explicit_uniform_location. */
3199 if (qual
->flags
.q
.uniform
) {
3200 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3203 const struct gl_context
*const ctx
= state
->ctx
;
3204 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3206 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3207 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3208 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3209 ctx
->Const
.MaxUserAssignableUniformLocations
);
3213 var
->data
.explicit_location
= true;
3214 var
->data
.location
= qual_location
;
3218 /* Between GL_ARB_explicit_attrib_location an
3219 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3220 * stage can be assigned explicit locations. The checking here associates
3221 * the correct extension with the correct stage's input / output:
3225 * vertex explicit_loc sso
3226 * tess control sso sso
3229 * fragment sso explicit_loc
3231 switch (state
->stage
) {
3232 case MESA_SHADER_VERTEX
:
3233 if (var
->data
.mode
== ir_var_shader_in
) {
3234 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3240 if (var
->data
.mode
== ir_var_shader_out
) {
3241 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3250 case MESA_SHADER_TESS_CTRL
:
3251 case MESA_SHADER_TESS_EVAL
:
3252 case MESA_SHADER_GEOMETRY
:
3253 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3254 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3263 case MESA_SHADER_FRAGMENT
:
3264 if (var
->data
.mode
== ir_var_shader_in
) {
3265 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3271 if (var
->data
.mode
== ir_var_shader_out
) {
3272 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3281 case MESA_SHADER_COMPUTE
:
3282 _mesa_glsl_error(loc
, state
,
3283 "compute shader variables cannot be given "
3284 "explicit locations");
3292 _mesa_glsl_error(loc
, state
,
3293 "%s cannot be given an explicit location in %s shader",
3295 _mesa_shader_stage_to_string(state
->stage
));
3297 var
->data
.explicit_location
= true;
3299 switch (state
->stage
) {
3300 case MESA_SHADER_VERTEX
:
3301 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3302 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3303 : (qual_location
+ VARYING_SLOT_VAR0
);
3306 case MESA_SHADER_TESS_CTRL
:
3307 case MESA_SHADER_TESS_EVAL
:
3308 case MESA_SHADER_GEOMETRY
:
3309 if (var
->data
.patch
)
3310 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3312 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3315 case MESA_SHADER_FRAGMENT
:
3316 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3317 ? (qual_location
+ FRAG_RESULT_DATA0
)
3318 : (qual_location
+ VARYING_SLOT_VAR0
);
3321 assert(!"Unexpected shader type");
3325 /* Check if index was set for the uniform instead of the function */
3326 if (qual
->flags
.q
.explicit_index
&& qual
->is_subroutine_decl()) {
3327 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3328 "used with subroutine functions");
3332 unsigned qual_index
;
3333 if (qual
->flags
.q
.explicit_index
&&
3334 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3336 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3337 * Layout Qualifiers):
3339 * "It is also a compile-time error if a fragment shader
3340 * sets a layout index to less than 0 or greater than 1."
3342 * Older specifications don't mandate a behavior; we take
3343 * this as a clarification and always generate the error.
3345 if (qual_index
> 1) {
3346 _mesa_glsl_error(loc
, state
,
3347 "explicit index may only be 0 or 1");
3349 var
->data
.explicit_index
= true;
3350 var
->data
.index
= qual_index
;
3357 validate_storage_for_sampler_image_types(ir_variable
*var
,
3358 struct _mesa_glsl_parse_state
*state
,
3361 /* From section 4.1.7 of the GLSL 4.40 spec:
3363 * "[Opaque types] can only be declared as function
3364 * parameters or uniform-qualified variables."
3366 * From section 4.1.7 of the ARB_bindless_texture spec:
3368 * "Samplers may be declared as shader inputs and outputs, as uniform
3369 * variables, as temporary variables, and as function parameters."
3371 * From section 4.1.X of the ARB_bindless_texture spec:
3373 * "Images may be declared as shader inputs and outputs, as uniform
3374 * variables, as temporary variables, and as function parameters."
3376 if (state
->has_bindless()) {
3377 if (var
->data
.mode
!= ir_var_auto
&&
3378 var
->data
.mode
!= ir_var_uniform
&&
3379 var
->data
.mode
!= ir_var_shader_in
&&
3380 var
->data
.mode
!= ir_var_shader_out
&&
3381 var
->data
.mode
!= ir_var_function_in
&&
3382 var
->data
.mode
!= ir_var_function_out
&&
3383 var
->data
.mode
!= ir_var_function_inout
) {
3384 _mesa_glsl_error(loc
, state
, "bindless image/sampler variables may "
3385 "only be declared as shader inputs and outputs, as "
3386 "uniform variables, as temporary variables and as "
3387 "function parameters");
3391 if (var
->data
.mode
!= ir_var_uniform
&&
3392 var
->data
.mode
!= ir_var_function_in
) {
3393 _mesa_glsl_error(loc
, state
, "image/sampler variables may only be "
3394 "declared as function parameters or "
3395 "uniform-qualified global variables");
3403 validate_memory_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3405 const struct ast_type_qualifier
*qual
,
3406 const glsl_type
*type
)
3408 /* From Section 4.10 (Memory Qualifiers) of the GLSL 4.50 spec:
3410 * "Memory qualifiers are only supported in the declarations of image
3411 * variables, buffer variables, and shader storage blocks; it is an error
3412 * to use such qualifiers in any other declarations.
3414 if (!type
->is_image() && !qual
->flags
.q
.buffer
) {
3415 if (qual
->flags
.q
.read_only
||
3416 qual
->flags
.q
.write_only
||
3417 qual
->flags
.q
.coherent
||
3418 qual
->flags
.q
._volatile
||
3419 qual
->flags
.q
.restrict_flag
) {
3420 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied "
3421 "in the declarations of image variables, buffer "
3422 "variables, and shader storage blocks");
3430 validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3432 const struct ast_type_qualifier
*qual
,
3433 const glsl_type
*type
)
3435 /* From section 4.4.6.2 (Format Layout Qualifiers) of the GLSL 4.50 spec:
3437 * "Format layout qualifiers can be used on image variable declarations
3438 * (those declared with a basic type having “image ” in its keyword)."
3440 if (!type
->is_image() && qual
->flags
.q
.explicit_image_format
) {
3441 _mesa_glsl_error(loc
, state
, "format layout qualifiers may only be "
3442 "applied to images");
3449 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3451 struct _mesa_glsl_parse_state
*state
,
3454 const glsl_type
*base_type
= var
->type
->without_array();
3456 if (!validate_image_format_qualifier_for_type(state
, loc
, qual
, base_type
) ||
3457 !validate_memory_qualifier_for_type(state
, loc
, qual
, base_type
))
3460 if (!base_type
->is_image())
3463 if (!validate_storage_for_sampler_image_types(var
, state
, loc
))
3466 var
->data
.memory_read_only
|= qual
->flags
.q
.read_only
;
3467 var
->data
.memory_write_only
|= qual
->flags
.q
.write_only
;
3468 var
->data
.memory_coherent
|= qual
->flags
.q
.coherent
;
3469 var
->data
.memory_volatile
|= qual
->flags
.q
._volatile
;
3470 var
->data
.memory_restrict
|= qual
->flags
.q
.restrict_flag
;
3472 if (qual
->flags
.q
.explicit_image_format
) {
3473 if (var
->data
.mode
== ir_var_function_in
) {
3474 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be used on "
3475 "image function parameters");
3478 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3479 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the base "
3480 "data type of the image");
3483 var
->data
.image_format
= qual
->image_format
;
3484 } else if (state
->has_image_load_formatted()) {
3485 if (var
->data
.mode
== ir_var_uniform
&&
3486 state
->EXT_shader_image_load_formatted_warn
) {
3487 _mesa_glsl_warning(loc
, state
, "GL_EXT_image_load_formatted used");
3490 if (var
->data
.mode
== ir_var_uniform
) {
3491 if (state
->es_shader
||
3492 !(state
->is_version(420, 310) || state
->ARB_shader_image_load_store_enable
)) {
3493 _mesa_glsl_error(loc
, state
, "all image uniforms must have a "
3494 "format layout qualifier");
3495 } else if (!qual
->flags
.q
.write_only
) {
3496 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3497 "`writeonly' must have a format layout qualifier");
3500 var
->data
.image_format
= PIPE_FORMAT_NONE
;
3503 /* From page 70 of the GLSL ES 3.1 specification:
3505 * "Except for image variables qualified with the format qualifiers r32f,
3506 * r32i, and r32ui, image variables must specify either memory qualifier
3507 * readonly or the memory qualifier writeonly."
3509 if (state
->es_shader
&&
3510 var
->data
.image_format
!= PIPE_FORMAT_R32_FLOAT
&&
3511 var
->data
.image_format
!= PIPE_FORMAT_R32_SINT
&&
3512 var
->data
.image_format
!= PIPE_FORMAT_R32_UINT
&&
3513 !var
->data
.memory_read_only
&&
3514 !var
->data
.memory_write_only
) {
3515 _mesa_glsl_error(loc
, state
, "image variables of format other than r32f, "
3516 "r32i or r32ui must be qualified `readonly' or "
3521 static inline const char*
3522 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3524 if (origin_upper_left
&& pixel_center_integer
)
3525 return "origin_upper_left, pixel_center_integer";
3526 else if (origin_upper_left
)
3527 return "origin_upper_left";
3528 else if (pixel_center_integer
)
3529 return "pixel_center_integer";
3535 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3536 const struct ast_type_qualifier
*qual
)
3538 /* If gl_FragCoord was previously declared, and the qualifiers were
3539 * different in any way, return true.
3541 if (state
->fs_redeclares_gl_fragcoord
) {
3542 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3543 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3550 validate_array_dimensions(const glsl_type
*t
,
3551 struct _mesa_glsl_parse_state
*state
,
3553 if (t
->is_array()) {
3554 t
= t
->fields
.array
;
3555 while (t
->is_array()) {
3556 if (t
->is_unsized_array()) {
3557 _mesa_glsl_error(loc
, state
,
3558 "only the outermost array dimension can "
3563 t
= t
->fields
.array
;
3569 apply_bindless_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3571 struct _mesa_glsl_parse_state
*state
,
3574 bool has_local_qualifiers
= qual
->flags
.q
.bindless_sampler
||
3575 qual
->flags
.q
.bindless_image
||
3576 qual
->flags
.q
.bound_sampler
||
3577 qual
->flags
.q
.bound_image
;
3579 /* The ARB_bindless_texture spec says:
3581 * "Modify Section 4.4.6 Opaque-Uniform Layout Qualifiers of the GLSL 4.30
3584 * "If these layout qualifiers are applied to other types of default block
3585 * uniforms, or variables with non-uniform storage, a compile-time error
3586 * will be generated."
3588 if (has_local_qualifiers
&& !qual
->flags
.q
.uniform
) {
3589 _mesa_glsl_error(loc
, state
, "ARB_bindless_texture layout qualifiers "
3590 "can only be applied to default block uniforms or "
3591 "variables with uniform storage");
3595 /* The ARB_bindless_texture spec doesn't state anything in this situation,
3596 * but it makes sense to only allow bindless_sampler/bound_sampler for
3597 * sampler types, and respectively bindless_image/bound_image for image
3600 if ((qual
->flags
.q
.bindless_sampler
|| qual
->flags
.q
.bound_sampler
) &&
3601 !var
->type
->contains_sampler()) {
3602 _mesa_glsl_error(loc
, state
, "bindless_sampler or bound_sampler can only "
3603 "be applied to sampler types");
3607 if ((qual
->flags
.q
.bindless_image
|| qual
->flags
.q
.bound_image
) &&
3608 !var
->type
->contains_image()) {
3609 _mesa_glsl_error(loc
, state
, "bindless_image or bound_image can only be "
3610 "applied to image types");
3614 /* The bindless_sampler/bindless_image (and respectively
3615 * bound_sampler/bound_image) layout qualifiers can be set at global and at
3618 if (var
->type
->contains_sampler() || var
->type
->contains_image()) {
3619 var
->data
.bindless
= qual
->flags
.q
.bindless_sampler
||
3620 qual
->flags
.q
.bindless_image
||
3621 state
->bindless_sampler_specified
||
3622 state
->bindless_image_specified
;
3624 var
->data
.bound
= qual
->flags
.q
.bound_sampler
||
3625 qual
->flags
.q
.bound_image
||
3626 state
->bound_sampler_specified
||
3627 state
->bound_image_specified
;
3632 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3634 struct _mesa_glsl_parse_state
*state
,
3637 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3639 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3641 * "Within any shader, the first redeclarations of gl_FragCoord
3642 * must appear before any use of gl_FragCoord."
3644 * Generate a compiler error if above condition is not met by the
3647 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3648 if (earlier
!= NULL
&&
3649 earlier
->data
.used
&&
3650 !state
->fs_redeclares_gl_fragcoord
) {
3651 _mesa_glsl_error(loc
, state
,
3652 "gl_FragCoord used before its first redeclaration "
3653 "in fragment shader");
3656 /* Make sure all gl_FragCoord redeclarations specify the same layout
3659 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3660 const char *const qual_string
=
3661 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3662 qual
->flags
.q
.pixel_center_integer
);
3664 const char *const state_string
=
3665 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3666 state
->fs_pixel_center_integer
);
3668 _mesa_glsl_error(loc
, state
,
3669 "gl_FragCoord redeclared with different layout "
3670 "qualifiers (%s) and (%s) ",
3674 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3675 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3676 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3677 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3678 state
->fs_redeclares_gl_fragcoord
=
3679 state
->fs_origin_upper_left
||
3680 state
->fs_pixel_center_integer
||
3681 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3684 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3685 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3686 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3687 ? "origin_upper_left" : "pixel_center_integer";
3689 _mesa_glsl_error(loc
, state
,
3690 "layout qualifier `%s' can only be applied to "
3691 "fragment shader input `gl_FragCoord'",
3695 if (qual
->flags
.q
.explicit_location
) {
3696 apply_explicit_location(qual
, var
, state
, loc
);
3698 if (qual
->flags
.q
.explicit_component
) {
3699 unsigned qual_component
;
3700 if (process_qualifier_constant(state
, loc
, "component",
3701 qual
->component
, &qual_component
)) {
3702 const glsl_type
*type
= var
->type
->without_array();
3703 unsigned components
= type
->component_slots();
3705 if (type
->is_matrix() || type
->is_struct()) {
3706 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3707 "cannot be applied to a matrix, a structure, "
3708 "a block, or an array containing any of "
3710 } else if (components
> 4 && type
->is_64bit()) {
3711 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3712 "cannot be applied to dvec%u.",
3714 } else if (qual_component
!= 0 &&
3715 (qual_component
+ components
- 1) > 3) {
3716 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3717 (qual_component
+ components
- 1));
3718 } else if (qual_component
== 1 && type
->is_64bit()) {
3719 /* We don't bother checking for 3 as it should be caught by the
3720 * overflow check above.
3722 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3723 "component 1 or 3");
3725 var
->data
.explicit_component
= true;
3726 var
->data
.location_frac
= qual_component
;
3730 } else if (qual
->flags
.q
.explicit_index
) {
3731 if (!qual
->subroutine_list
)
3732 _mesa_glsl_error(loc
, state
,
3733 "explicit index requires explicit location");
3734 } else if (qual
->flags
.q
.explicit_component
) {
3735 _mesa_glsl_error(loc
, state
,
3736 "explicit component requires explicit location");
3739 if (qual
->flags
.q
.explicit_binding
) {
3740 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3743 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3744 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3745 unsigned qual_stream
;
3746 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3748 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3749 var
->data
.stream
= qual_stream
;
3753 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3754 unsigned qual_xfb_buffer
;
3755 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3756 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3757 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3758 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3759 if (qual
->flags
.q
.explicit_xfb_buffer
)
3760 var
->data
.explicit_xfb_buffer
= true;
3764 if (qual
->flags
.q
.explicit_xfb_offset
) {
3765 unsigned qual_xfb_offset
;
3766 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3768 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3769 qual
->offset
, &qual_xfb_offset
) &&
3770 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3771 var
->type
, component_size
)) {
3772 var
->data
.offset
= qual_xfb_offset
;
3773 var
->data
.explicit_xfb_offset
= true;
3777 if (qual
->flags
.q
.explicit_xfb_stride
) {
3778 unsigned qual_xfb_stride
;
3779 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3780 qual
->xfb_stride
, &qual_xfb_stride
)) {
3781 var
->data
.xfb_stride
= qual_xfb_stride
;
3782 var
->data
.explicit_xfb_stride
= true;
3786 if (var
->type
->contains_atomic()) {
3787 if (var
->data
.mode
== ir_var_uniform
) {
3788 if (var
->data
.explicit_binding
) {
3790 &state
->atomic_counter_offsets
[var
->data
.binding
];
3792 if (*offset
% ATOMIC_COUNTER_SIZE
)
3793 _mesa_glsl_error(loc
, state
,
3794 "misaligned atomic counter offset");
3796 var
->data
.offset
= *offset
;
3797 *offset
+= var
->type
->atomic_size();
3800 _mesa_glsl_error(loc
, state
,
3801 "atomic counters require explicit binding point");
3803 } else if (var
->data
.mode
!= ir_var_function_in
) {
3804 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3805 "function parameters or uniform-qualified "
3806 "global variables");
3810 if (var
->type
->contains_sampler() &&
3811 !validate_storage_for_sampler_image_types(var
, state
, loc
))
3814 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3815 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3816 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3817 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3818 * These extensions and all following extensions that add the 'layout'
3819 * keyword have been modified to require the use of 'in' or 'out'.
3821 * The following extension do not allow the deprecated keywords:
3823 * GL_AMD_conservative_depth
3824 * GL_ARB_conservative_depth
3825 * GL_ARB_gpu_shader5
3826 * GL_ARB_separate_shader_objects
3827 * GL_ARB_tessellation_shader
3828 * GL_ARB_transform_feedback3
3829 * GL_ARB_uniform_buffer_object
3831 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3832 * allow layout with the deprecated keywords.
3834 const bool relaxed_layout_qualifier_checking
=
3835 state
->ARB_fragment_coord_conventions_enable
;
3837 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3838 || qual
->flags
.q
.varying
;
3839 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3840 if (relaxed_layout_qualifier_checking
) {
3841 _mesa_glsl_warning(loc
, state
,
3842 "`layout' qualifier may not be used with "
3843 "`attribute' or `varying'");
3845 _mesa_glsl_error(loc
, state
,
3846 "`layout' qualifier may not be used with "
3847 "`attribute' or `varying'");
3851 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3852 * AMD_conservative_depth.
3854 if (qual
->flags
.q
.depth_type
3855 && !state
->is_version(420, 0)
3856 && !state
->AMD_conservative_depth_enable
3857 && !state
->ARB_conservative_depth_enable
) {
3858 _mesa_glsl_error(loc
, state
,
3859 "extension GL_AMD_conservative_depth or "
3860 "GL_ARB_conservative_depth must be enabled "
3861 "to use depth layout qualifiers");
3862 } else if (qual
->flags
.q
.depth_type
3863 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3864 _mesa_glsl_error(loc
, state
,
3865 "depth layout qualifiers can be applied only to "
3869 switch (qual
->depth_type
) {
3871 var
->data
.depth_layout
= ir_depth_layout_any
;
3873 case ast_depth_greater
:
3874 var
->data
.depth_layout
= ir_depth_layout_greater
;
3876 case ast_depth_less
:
3877 var
->data
.depth_layout
= ir_depth_layout_less
;
3879 case ast_depth_unchanged
:
3880 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3883 var
->data
.depth_layout
= ir_depth_layout_none
;
3887 if (qual
->flags
.q
.std140
||
3888 qual
->flags
.q
.std430
||
3889 qual
->flags
.q
.packed
||
3890 qual
->flags
.q
.shared
) {
3891 _mesa_glsl_error(loc
, state
,
3892 "uniform and shader storage block layout qualifiers "
3893 "std140, std430, packed, and shared can only be "
3894 "applied to uniform or shader storage blocks, not "
3898 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3899 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3902 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3905 * "Fragment shaders also allow the following layout qualifier on in only
3906 * (not with variable declarations)
3907 * layout-qualifier-id
3908 * early_fragment_tests
3911 if (qual
->flags
.q
.early_fragment_tests
) {
3912 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3913 "valid in fragment shader input layout declaration.");
3916 if (qual
->flags
.q
.inner_coverage
) {
3917 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3918 "valid in fragment shader input layout declaration.");
3921 if (qual
->flags
.q
.post_depth_coverage
) {
3922 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3923 "valid in fragment shader input layout declaration.");
3926 if (state
->has_bindless())
3927 apply_bindless_qualifier_to_variable(qual
, var
, state
, loc
);
3929 if (qual
->flags
.q
.pixel_interlock_ordered
||
3930 qual
->flags
.q
.pixel_interlock_unordered
||
3931 qual
->flags
.q
.sample_interlock_ordered
||
3932 qual
->flags
.q
.sample_interlock_unordered
) {
3933 _mesa_glsl_error(loc
, state
, "interlock layout qualifiers: "
3934 "pixel_interlock_ordered, pixel_interlock_unordered, "
3935 "sample_interlock_ordered and sample_interlock_unordered, "
3936 "only valid in fragment shader input layout declaration.");
3941 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3943 struct _mesa_glsl_parse_state
*state
,
3947 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3949 if (qual
->flags
.q
.invariant
) {
3950 if (var
->data
.used
) {
3951 _mesa_glsl_error(loc
, state
,
3952 "variable `%s' may not be redeclared "
3953 "`invariant' after being used",
3956 var
->data
.explicit_invariant
= true;
3957 var
->data
.invariant
= true;
3961 if (qual
->flags
.q
.precise
) {
3962 if (var
->data
.used
) {
3963 _mesa_glsl_error(loc
, state
,
3964 "variable `%s' may not be redeclared "
3965 "`precise' after being used",
3968 var
->data
.precise
= 1;
3972 if (qual
->is_subroutine_decl() && !qual
->flags
.q
.uniform
) {
3973 _mesa_glsl_error(loc
, state
,
3974 "`subroutine' may only be applied to uniforms, "
3975 "subroutine type declarations, or function definitions");
3978 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3979 || qual
->flags
.q
.uniform
3980 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3981 var
->data
.read_only
= 1;
3983 if (qual
->flags
.q
.centroid
)
3984 var
->data
.centroid
= 1;
3986 if (qual
->flags
.q
.sample
)
3987 var
->data
.sample
= 1;
3989 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3990 if (state
->es_shader
) {
3991 var
->data
.precision
=
3992 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3995 if (qual
->flags
.q
.patch
)
3996 var
->data
.patch
= 1;
3998 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3999 var
->type
= glsl_type::error_type
;
4000 _mesa_glsl_error(loc
, state
,
4001 "`attribute' variables may not be declared in the "
4003 _mesa_shader_stage_to_string(state
->stage
));
4006 /* Disallow layout qualifiers which may only appear on layout declarations. */
4007 if (qual
->flags
.q
.prim_type
) {
4008 _mesa_glsl_error(loc
, state
,
4009 "Primitive type may only be specified on GS input or output "
4010 "layout declaration, not on variables.");
4013 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
4015 * "However, the const qualifier cannot be used with out or inout."
4017 * The same section of the GLSL 4.40 spec further clarifies this saying:
4019 * "The const qualifier cannot be used with out or inout, or a
4020 * compile-time error results."
4022 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
4023 _mesa_glsl_error(loc
, state
,
4024 "`const' may not be applied to `out' or `inout' "
4025 "function parameters");
4028 /* If there is no qualifier that changes the mode of the variable, leave
4029 * the setting alone.
4031 assert(var
->data
.mode
!= ir_var_temporary
);
4032 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
4033 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
4034 else if (qual
->flags
.q
.in
)
4035 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
4036 else if (qual
->flags
.q
.attribute
4037 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
4038 var
->data
.mode
= ir_var_shader_in
;
4039 else if (qual
->flags
.q
.out
)
4040 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
4041 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
4042 var
->data
.mode
= ir_var_shader_out
;
4043 else if (qual
->flags
.q
.uniform
)
4044 var
->data
.mode
= ir_var_uniform
;
4045 else if (qual
->flags
.q
.buffer
)
4046 var
->data
.mode
= ir_var_shader_storage
;
4047 else if (qual
->flags
.q
.shared_storage
)
4048 var
->data
.mode
= ir_var_shader_shared
;
4050 if (!is_parameter
&& state
->has_framebuffer_fetch() &&
4051 state
->stage
== MESA_SHADER_FRAGMENT
) {
4052 if (state
->is_version(130, 300))
4053 var
->data
.fb_fetch_output
= qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
4055 var
->data
.fb_fetch_output
= (strcmp(var
->name
, "gl_LastFragData") == 0);
4058 if (var
->data
.fb_fetch_output
) {
4059 var
->data
.assigned
= true;
4060 var
->data
.memory_coherent
= !qual
->flags
.q
.non_coherent
;
4062 /* From the EXT_shader_framebuffer_fetch spec:
4064 * "It is an error to declare an inout fragment output not qualified
4065 * with layout(noncoherent) if the GL_EXT_shader_framebuffer_fetch
4066 * extension hasn't been enabled."
4068 if (var
->data
.memory_coherent
&&
4069 !state
->EXT_shader_framebuffer_fetch_enable
)
4070 _mesa_glsl_error(loc
, state
,
4071 "invalid declaration of framebuffer fetch output not "
4072 "qualified with layout(noncoherent)");
4075 /* From the EXT_shader_framebuffer_fetch spec:
4077 * "Fragment outputs declared inout may specify the following layout
4078 * qualifier: [...] noncoherent"
4080 if (qual
->flags
.q
.non_coherent
)
4081 _mesa_glsl_error(loc
, state
,
4082 "invalid layout(noncoherent) qualifier not part of "
4083 "framebuffer fetch output declaration");
4086 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
4087 /* User-defined ins/outs are not permitted in compute shaders. */
4088 if (state
->stage
== MESA_SHADER_COMPUTE
) {
4089 _mesa_glsl_error(loc
, state
,
4090 "user-defined input and output variables are not "
4091 "permitted in compute shaders");
4094 /* This variable is being used to link data between shader stages (in
4095 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
4096 * that is allowed for such purposes.
4098 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
4100 * "The varying qualifier can be used only with the data types
4101 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
4104 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
4105 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
4107 * "Fragment inputs can only be signed and unsigned integers and
4108 * integer vectors, float, floating-point vectors, matrices, or
4109 * arrays of these. Structures cannot be input.
4111 * Similar text exists in the section on vertex shader outputs.
4113 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
4114 * 3.00 spec allows structs as well. Varying structs are also allowed
4117 * From section 4.3.4 of the ARB_bindless_texture spec:
4119 * "(modify third paragraph of the section to allow sampler and image
4120 * types) ... Vertex shader inputs can only be float,
4121 * single-precision floating-point scalars, single-precision
4122 * floating-point vectors, matrices, signed and unsigned integers
4123 * and integer vectors, sampler and image types."
4125 * From section 4.3.6 of the ARB_bindless_texture spec:
4127 * "Output variables can only be floating-point scalars,
4128 * floating-point vectors, matrices, signed or unsigned integers or
4129 * integer vectors, sampler or image types, or arrays or structures
4132 switch (var
->type
->without_array()->base_type
) {
4133 case GLSL_TYPE_FLOAT
:
4134 /* Ok in all GLSL versions */
4136 case GLSL_TYPE_UINT
:
4138 if (state
->is_version(130, 300) || state
->EXT_gpu_shader4_enable
)
4140 _mesa_glsl_error(loc
, state
,
4141 "varying variables must be of base type float in %s",
4142 state
->get_version_string());
4144 case GLSL_TYPE_STRUCT
:
4145 if (state
->is_version(150, 300))
4147 _mesa_glsl_error(loc
, state
,
4148 "varying variables may not be of type struct");
4150 case GLSL_TYPE_DOUBLE
:
4151 case GLSL_TYPE_UINT64
:
4152 case GLSL_TYPE_INT64
:
4154 case GLSL_TYPE_SAMPLER
:
4155 case GLSL_TYPE_IMAGE
:
4156 if (state
->has_bindless())
4160 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
4165 if (state
->all_invariant
&& var
->data
.mode
== ir_var_shader_out
) {
4166 var
->data
.explicit_invariant
= true;
4167 var
->data
.invariant
= true;
4170 var
->data
.interpolation
=
4171 interpret_interpolation_qualifier(qual
, var
->type
,
4172 (ir_variable_mode
) var
->data
.mode
,
4175 /* Does the declaration use the deprecated 'attribute' or 'varying'
4178 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
4179 || qual
->flags
.q
.varying
;
4182 /* Validate auxiliary storage qualifiers */
4184 /* From section 4.3.4 of the GLSL 1.30 spec:
4185 * "It is an error to use centroid in in a vertex shader."
4187 * From section 4.3.4 of the GLSL ES 3.00 spec:
4188 * "It is an error to use centroid in or interpolation qualifiers in
4189 * a vertex shader input."
4192 /* Section 4.3.6 of the GLSL 1.30 specification states:
4193 * "It is an error to use centroid out in a fragment shader."
4195 * The GL_ARB_shading_language_420pack extension specification states:
4196 * "It is an error to use auxiliary storage qualifiers or interpolation
4197 * qualifiers on an output in a fragment shader."
4199 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
4200 _mesa_glsl_error(loc
, state
,
4201 "sample qualifier may only be used on `in` or `out` "
4202 "variables between shader stages");
4204 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
4205 _mesa_glsl_error(loc
, state
,
4206 "centroid qualifier may only be used with `in', "
4207 "`out' or `varying' variables between shader stages");
4210 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
4211 _mesa_glsl_error(loc
, state
,
4212 "the shared storage qualifiers can only be used with "
4216 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
4220 * Get the variable that is being redeclared by this declaration or if it
4221 * does not exist, the current declared variable.
4223 * Semantic checks to verify the validity of the redeclaration are also
4224 * performed. If semantic checks fail, compilation error will be emitted via
4225 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
4228 * A pointer to an existing variable in the current scope if the declaration
4229 * is a redeclaration, current variable otherwise. \c is_declared boolean
4230 * will return \c true if the declaration is a redeclaration, \c false
4233 static ir_variable
*
4234 get_variable_being_redeclared(ir_variable
**var_ptr
, YYLTYPE loc
,
4235 struct _mesa_glsl_parse_state
*state
,
4236 bool allow_all_redeclarations
,
4237 bool *is_redeclaration
)
4239 ir_variable
*var
= *var_ptr
;
4241 /* Check if this declaration is actually a re-declaration, either to
4242 * resize an array or add qualifiers to an existing variable.
4244 * This is allowed for variables in the current scope, or when at
4245 * global scope (for built-ins in the implicit outer scope).
4247 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
4248 if (earlier
== NULL
||
4249 (state
->current_function
!= NULL
&&
4250 !state
->symbols
->name_declared_this_scope(var
->name
))) {
4251 *is_redeclaration
= false;
4255 *is_redeclaration
= true;
4257 if (earlier
->data
.how_declared
== ir_var_declared_implicitly
) {
4258 /* Verify that the redeclaration of a built-in does not change the
4259 * storage qualifier. There are a couple special cases.
4261 * 1. Some built-in variables that are defined as 'in' in the
4262 * specification are implemented as system values. Allow
4263 * ir_var_system_value -> ir_var_shader_in.
4265 * 2. gl_LastFragData is implemented as a ir_var_shader_out, but the
4266 * specification requires that redeclarations omit any qualifier.
4267 * Allow ir_var_shader_out -> ir_var_auto for this one variable.
4269 if (earlier
->data
.mode
!= var
->data
.mode
&&
4270 !(earlier
->data
.mode
== ir_var_system_value
&&
4271 var
->data
.mode
== ir_var_shader_in
) &&
4272 !(strcmp(var
->name
, "gl_LastFragData") == 0 &&
4273 var
->data
.mode
== ir_var_auto
)) {
4274 _mesa_glsl_error(&loc
, state
,
4275 "redeclaration cannot change qualification of `%s'",
4280 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4282 * "It is legal to declare an array without a size and then
4283 * later re-declare the same name as an array of the same
4284 * type and specify a size."
4286 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4287 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4288 const int size
= var
->type
->array_size();
4289 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4290 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4291 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4293 earlier
->data
.max_array_access
);
4296 earlier
->type
= var
->type
;
4300 } else if (earlier
->type
!= var
->type
) {
4301 _mesa_glsl_error(&loc
, state
,
4302 "redeclaration of `%s' has incorrect type",
4304 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4305 state
->is_version(150, 0))
4306 && strcmp(var
->name
, "gl_FragCoord") == 0) {
4307 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4310 * We don't really need to do anything here, just allow the
4311 * redeclaration. Any error on the gl_FragCoord is handled on the ast
4312 * level at apply_layout_qualifier_to_variable using the
4313 * ast_type_qualifier and _mesa_glsl_parse_state, or later at
4316 /* According to section 4.3.7 of the GLSL 1.30 spec,
4317 * the following built-in varaibles can be redeclared with an
4318 * interpolation qualifier:
4321 * * gl_FrontSecondaryColor
4322 * * gl_BackSecondaryColor
4324 * * gl_SecondaryColor
4326 } else if (state
->is_version(130, 0)
4327 && (strcmp(var
->name
, "gl_FrontColor") == 0
4328 || strcmp(var
->name
, "gl_BackColor") == 0
4329 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4330 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4331 || strcmp(var
->name
, "gl_Color") == 0
4332 || strcmp(var
->name
, "gl_SecondaryColor") == 0)) {
4333 earlier
->data
.interpolation
= var
->data
.interpolation
;
4335 /* Layout qualifiers for gl_FragDepth. */
4336 } else if ((state
->is_version(420, 0) ||
4337 state
->AMD_conservative_depth_enable
||
4338 state
->ARB_conservative_depth_enable
)
4339 && strcmp(var
->name
, "gl_FragDepth") == 0) {
4341 /** From the AMD_conservative_depth spec:
4342 * Within any shader, the first redeclarations of gl_FragDepth
4343 * must appear before any use of gl_FragDepth.
4345 if (earlier
->data
.used
) {
4346 _mesa_glsl_error(&loc
, state
,
4347 "the first redeclaration of gl_FragDepth "
4348 "must appear before any use of gl_FragDepth");
4351 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4352 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4353 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4354 _mesa_glsl_error(&loc
, state
,
4355 "gl_FragDepth: depth layout is declared here "
4356 "as '%s, but it was previously declared as "
4358 depth_layout_string(var
->data
.depth_layout
),
4359 depth_layout_string(earlier
->data
.depth_layout
));
4362 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4364 } else if (state
->has_framebuffer_fetch() &&
4365 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4366 var
->data
.mode
== ir_var_auto
) {
4367 /* According to the EXT_shader_framebuffer_fetch spec:
4369 * "By default, gl_LastFragData is declared with the mediump precision
4370 * qualifier. This can be changed by redeclaring the corresponding
4371 * variables with the desired precision qualifier."
4373 * "Fragment shaders may specify the following layout qualifier only for
4374 * redeclaring the built-in gl_LastFragData array [...]: noncoherent"
4376 earlier
->data
.precision
= var
->data
.precision
;
4377 earlier
->data
.memory_coherent
= var
->data
.memory_coherent
;
4379 } else if ((earlier
->data
.how_declared
== ir_var_declared_implicitly
&&
4380 state
->allow_builtin_variable_redeclaration
) ||
4381 allow_all_redeclarations
) {
4382 /* Allow verbatim redeclarations of built-in variables. Not explicitly
4383 * valid, but some applications do it.
4386 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4393 * Generate the IR for an initializer in a variable declaration
4396 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4397 ast_fully_specified_type
*type
,
4398 exec_list
*initializer_instructions
,
4399 struct _mesa_glsl_parse_state
*state
)
4401 void *mem_ctx
= state
;
4402 ir_rvalue
*result
= NULL
;
4404 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4406 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4408 * "All uniform variables are read-only and are initialized either
4409 * directly by an application via API commands, or indirectly by
4412 if (var
->data
.mode
== ir_var_uniform
) {
4413 state
->check_version(120, 0, &initializer_loc
,
4414 "cannot initialize uniform %s",
4418 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4420 * "Buffer variables cannot have initializers."
4422 if (var
->data
.mode
== ir_var_shader_storage
) {
4423 _mesa_glsl_error(&initializer_loc
, state
,
4424 "cannot initialize buffer variable %s",
4428 /* From section 4.1.7 of the GLSL 4.40 spec:
4430 * "Opaque variables [...] are initialized only through the
4431 * OpenGL API; they cannot be declared with an initializer in a
4434 * From section 4.1.7 of the ARB_bindless_texture spec:
4436 * "Samplers may be declared as shader inputs and outputs, as uniform
4437 * variables, as temporary variables, and as function parameters."
4439 * From section 4.1.X of the ARB_bindless_texture spec:
4441 * "Images may be declared as shader inputs and outputs, as uniform
4442 * variables, as temporary variables, and as function parameters."
4444 if (var
->type
->contains_atomic() ||
4445 (!state
->has_bindless() && var
->type
->contains_opaque())) {
4446 _mesa_glsl_error(&initializer_loc
, state
,
4447 "cannot initialize %s variable %s",
4448 var
->name
, state
->has_bindless() ? "atomic" : "opaque");
4451 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4452 _mesa_glsl_error(&initializer_loc
, state
,
4453 "cannot initialize %s shader input / %s %s",
4454 _mesa_shader_stage_to_string(state
->stage
),
4455 (state
->stage
== MESA_SHADER_VERTEX
)
4456 ? "attribute" : "varying",
4460 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4461 _mesa_glsl_error(&initializer_loc
, state
,
4462 "cannot initialize %s shader output %s",
4463 _mesa_shader_stage_to_string(state
->stage
),
4467 /* If the initializer is an ast_aggregate_initializer, recursively store
4468 * type information from the LHS into it, so that its hir() function can do
4471 if (decl
->initializer
->oper
== ast_aggregate
)
4472 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4474 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4475 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4477 /* Calculate the constant value if this is a const or uniform
4480 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4482 * "Declarations of globals without a storage qualifier, or with
4483 * just the const qualifier, may include initializers, in which case
4484 * they will be initialized before the first line of main() is
4485 * executed. Such initializers must be a constant expression."
4487 * The same section of the GLSL ES 3.00.4 spec has similar language.
4489 if (type
->qualifier
.flags
.q
.constant
4490 || type
->qualifier
.flags
.q
.uniform
4491 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4492 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4494 if (new_rhs
!= NULL
) {
4497 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4500 * "A constant expression is one of
4504 * - an expression formed by an operator on operands that are
4505 * all constant expressions, including getting an element of
4506 * a constant array, or a field of a constant structure, or
4507 * components of a constant vector. However, the sequence
4508 * operator ( , ) and the assignment operators ( =, +=, ...)
4509 * are not included in the operators that can create a
4510 * constant expression."
4512 * Section 12.43 (Sequence operator and constant expressions) says:
4514 * "Should the following construct be allowed?
4518 * The expression within the brackets uses the sequence operator
4519 * (',') and returns the integer 3 so the construct is declaring
4520 * a single-dimensional array of size 3. In some languages, the
4521 * construct declares a two-dimensional array. It would be
4522 * preferable to make this construct illegal to avoid confusion.
4524 * One possibility is to change the definition of the sequence
4525 * operator so that it does not return a constant-expression and
4526 * hence cannot be used to declare an array size.
4528 * RESOLUTION: The result of a sequence operator is not a
4529 * constant-expression."
4531 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4532 * contains language almost identical to the section 4.3.3 in the
4533 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4536 ir_constant
*constant_value
=
4537 rhs
->constant_expression_value(mem_ctx
);
4539 if (!constant_value
||
4540 (state
->is_version(430, 300) &&
4541 decl
->initializer
->has_sequence_subexpression())) {
4542 const char *const variable_mode
=
4543 (type
->qualifier
.flags
.q
.constant
)
4545 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4547 /* If ARB_shading_language_420pack is enabled, initializers of
4548 * const-qualified local variables do not have to be constant
4549 * expressions. Const-qualified global variables must still be
4550 * initialized with constant expressions.
4552 if (!state
->has_420pack()
4553 || state
->current_function
== NULL
) {
4554 _mesa_glsl_error(& initializer_loc
, state
,
4555 "initializer of %s variable `%s' must be a "
4556 "constant expression",
4559 if (var
->type
->is_numeric()) {
4560 /* Reduce cascading errors. */
4561 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4562 ? ir_constant::zero(state
, var
->type
) : NULL
;
4566 rhs
= constant_value
;
4567 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4568 ? constant_value
: NULL
;
4571 if (var
->type
->is_numeric()) {
4572 /* Reduce cascading errors. */
4573 rhs
= var
->constant_value
= type
->qualifier
.flags
.q
.constant
4574 ? ir_constant::zero(state
, var
->type
) : NULL
;
4579 if (rhs
&& !rhs
->type
->is_error()) {
4580 bool temp
= var
->data
.read_only
;
4581 if (type
->qualifier
.flags
.q
.constant
)
4582 var
->data
.read_only
= false;
4584 /* Never emit code to initialize a uniform.
4586 const glsl_type
*initializer_type
;
4587 bool error_emitted
= false;
4588 if (!type
->qualifier
.flags
.q
.uniform
) {
4590 do_assignment(initializer_instructions
, state
,
4592 &result
, true, true,
4593 type
->get_location());
4594 initializer_type
= result
->type
;
4596 initializer_type
= rhs
->type
;
4598 if (!error_emitted
) {
4599 var
->constant_initializer
= rhs
->constant_expression_value(mem_ctx
);
4600 var
->data
.has_initializer
= true;
4602 /* If the declared variable is an unsized array, it must inherrit
4603 * its full type from the initializer. A declaration such as
4605 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4609 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4611 * The assignment generated in the if-statement (below) will also
4612 * automatically handle this case for non-uniforms.
4614 * If the declared variable is not an array, the types must
4615 * already match exactly. As a result, the type assignment
4616 * here can be done unconditionally. For non-uniforms the call
4617 * to do_assignment can change the type of the initializer (via
4618 * the implicit conversion rules). For uniforms the initializer
4619 * must be a constant expression, and the type of that expression
4620 * was validated above.
4622 var
->type
= initializer_type
;
4625 var
->data
.read_only
= temp
;
4632 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4633 YYLTYPE loc
, ir_variable
*var
,
4634 unsigned num_vertices
,
4636 const char *var_category
)
4638 if (var
->type
->is_unsized_array()) {
4639 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4641 * All geometry shader input unsized array declarations will be
4642 * sized by an earlier input layout qualifier, when present, as per
4643 * the following table.
4645 * Followed by a table mapping each allowed input layout qualifier to
4646 * the corresponding input length.
4648 * Similarly for tessellation control shader outputs.
4650 if (num_vertices
!= 0)
4651 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4654 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4655 * includes the following examples of compile-time errors:
4657 * // code sequence within one shader...
4658 * in vec4 Color1[]; // size unknown
4659 * ...Color1.length()...// illegal, length() unknown
4660 * in vec4 Color2[2]; // size is 2
4661 * ...Color1.length()...// illegal, Color1 still has no size
4662 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4663 * layout(lines) in; // legal, input size is 2, matching
4664 * in vec4 Color4[3]; // illegal, contradicts layout
4667 * To detect the case illustrated by Color3, we verify that the size of
4668 * an explicitly-sized array matches the size of any previously declared
4669 * explicitly-sized array. To detect the case illustrated by Color4, we
4670 * verify that the size of an explicitly-sized array is consistent with
4671 * any previously declared input layout.
4673 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4674 _mesa_glsl_error(&loc
, state
,
4675 "%s size contradicts previously declared layout "
4676 "(size is %u, but layout requires a size of %u)",
4677 var_category
, var
->type
->length
, num_vertices
);
4678 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4679 _mesa_glsl_error(&loc
, state
,
4680 "%s sizes are inconsistent (size is %u, but a "
4681 "previous declaration has size %u)",
4682 var_category
, var
->type
->length
, *size
);
4684 *size
= var
->type
->length
;
4690 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4691 YYLTYPE loc
, ir_variable
*var
)
4693 unsigned num_vertices
= 0;
4695 if (state
->tcs_output_vertices_specified
) {
4696 if (!state
->out_qualifier
->vertices
->
4697 process_qualifier_constant(state
, "vertices",
4698 &num_vertices
, false)) {
4702 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4703 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4704 "GL_MAX_PATCH_VERTICES", num_vertices
);
4709 if (!var
->type
->is_array() && !var
->data
.patch
) {
4710 _mesa_glsl_error(&loc
, state
,
4711 "tessellation control shader outputs must be arrays");
4713 /* To avoid cascading failures, short circuit the checks below. */
4717 if (var
->data
.patch
)
4720 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4721 &state
->tcs_output_size
,
4722 "tessellation control shader output");
4726 * Do additional processing necessary for tessellation control/evaluation shader
4727 * input declarations. This covers both interface block arrays and bare input
4731 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4732 YYLTYPE loc
, ir_variable
*var
)
4734 if (!var
->type
->is_array() && !var
->data
.patch
) {
4735 _mesa_glsl_error(&loc
, state
,
4736 "per-vertex tessellation shader inputs must be arrays");
4737 /* Avoid cascading failures. */
4741 if (var
->data
.patch
)
4744 /* The ARB_tessellation_shader spec says:
4746 * "Declaring an array size is optional. If no size is specified, it
4747 * will be taken from the implementation-dependent maximum patch size
4748 * (gl_MaxPatchVertices). If a size is specified, it must match the
4749 * maximum patch size; otherwise, a compile or link error will occur."
4751 * This text appears twice, once for TCS inputs, and again for TES inputs.
4753 if (var
->type
->is_unsized_array()) {
4754 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4755 state
->Const
.MaxPatchVertices
);
4756 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4757 _mesa_glsl_error(&loc
, state
,
4758 "per-vertex tessellation shader input arrays must be "
4759 "sized to gl_MaxPatchVertices (%d).",
4760 state
->Const
.MaxPatchVertices
);
4766 * Do additional processing necessary for geometry shader input declarations
4767 * (this covers both interface blocks arrays and bare input variables).
4770 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4771 YYLTYPE loc
, ir_variable
*var
)
4773 unsigned num_vertices
= 0;
4775 if (state
->gs_input_prim_type_specified
) {
4776 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4779 /* Geometry shader input variables must be arrays. Caller should have
4780 * reported an error for this.
4782 if (!var
->type
->is_array()) {
4783 assert(state
->error
);
4785 /* To avoid cascading failures, short circuit the checks below. */
4789 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4790 &state
->gs_input_size
,
4791 "geometry shader input");
4795 validate_identifier(const char *identifier
, YYLTYPE loc
,
4796 struct _mesa_glsl_parse_state
*state
)
4798 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4800 * "Identifiers starting with "gl_" are reserved for use by
4801 * OpenGL, and may not be declared in a shader as either a
4802 * variable or a function."
4804 if (is_gl_identifier(identifier
)) {
4805 _mesa_glsl_error(&loc
, state
,
4806 "identifier `%s' uses reserved `gl_' prefix",
4808 } else if (strstr(identifier
, "__")) {
4809 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4812 * "In addition, all identifiers containing two
4813 * consecutive underscores (__) are reserved as
4814 * possible future keywords."
4816 * The intention is that names containing __ are reserved for internal
4817 * use by the implementation, and names prefixed with GL_ are reserved
4818 * for use by Khronos. Names simply containing __ are dangerous to use,
4819 * but should be allowed.
4821 * A future version of the GLSL specification will clarify this.
4823 _mesa_glsl_warning(&loc
, state
,
4824 "identifier `%s' uses reserved `__' string",
4830 ast_declarator_list::hir(exec_list
*instructions
,
4831 struct _mesa_glsl_parse_state
*state
)
4834 const struct glsl_type
*decl_type
;
4835 const char *type_name
= NULL
;
4836 ir_rvalue
*result
= NULL
;
4837 YYLTYPE loc
= this->get_location();
4839 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4841 * "To ensure that a particular output variable is invariant, it is
4842 * necessary to use the invariant qualifier. It can either be used to
4843 * qualify a previously declared variable as being invariant
4845 * invariant gl_Position; // make existing gl_Position be invariant"
4847 * In these cases the parser will set the 'invariant' flag in the declarator
4848 * list, and the type will be NULL.
4850 if (this->invariant
) {
4851 assert(this->type
== NULL
);
4853 if (state
->current_function
!= NULL
) {
4854 _mesa_glsl_error(& loc
, state
,
4855 "all uses of `invariant' keyword must be at global "
4859 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4860 assert(decl
->array_specifier
== NULL
);
4861 assert(decl
->initializer
== NULL
);
4863 ir_variable
*const earlier
=
4864 state
->symbols
->get_variable(decl
->identifier
);
4865 if (earlier
== NULL
) {
4866 _mesa_glsl_error(& loc
, state
,
4867 "undeclared variable `%s' cannot be marked "
4868 "invariant", decl
->identifier
);
4869 } else if (!is_allowed_invariant(earlier
, state
)) {
4870 _mesa_glsl_error(&loc
, state
,
4871 "`%s' cannot be marked invariant; interfaces between "
4872 "shader stages only.", decl
->identifier
);
4873 } else if (earlier
->data
.used
) {
4874 _mesa_glsl_error(& loc
, state
,
4875 "variable `%s' may not be redeclared "
4876 "`invariant' after being used",
4879 earlier
->data
.explicit_invariant
= true;
4880 earlier
->data
.invariant
= true;
4884 /* Invariant redeclarations do not have r-values.
4889 if (this->precise
) {
4890 assert(this->type
== NULL
);
4892 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4893 assert(decl
->array_specifier
== NULL
);
4894 assert(decl
->initializer
== NULL
);
4896 ir_variable
*const earlier
=
4897 state
->symbols
->get_variable(decl
->identifier
);
4898 if (earlier
== NULL
) {
4899 _mesa_glsl_error(& loc
, state
,
4900 "undeclared variable `%s' cannot be marked "
4901 "precise", decl
->identifier
);
4902 } else if (state
->current_function
!= NULL
&&
4903 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4904 /* Note: we have to check if we're in a function, since
4905 * builtins are treated as having come from another scope.
4907 _mesa_glsl_error(& loc
, state
,
4908 "variable `%s' from an outer scope may not be "
4909 "redeclared `precise' in this scope",
4911 } else if (earlier
->data
.used
) {
4912 _mesa_glsl_error(& loc
, state
,
4913 "variable `%s' may not be redeclared "
4914 "`precise' after being used",
4917 earlier
->data
.precise
= true;
4921 /* Precise redeclarations do not have r-values either. */
4925 assert(this->type
!= NULL
);
4926 assert(!this->invariant
);
4927 assert(!this->precise
);
4929 /* GL_EXT_shader_image_load_store base type uses GLSL_TYPE_VOID as a special value to
4930 * indicate that it needs to be updated later (see glsl_parser.yy).
4931 * This is done here, based on the layout qualifier and the type of the image var
4933 if (this->type
->qualifier
.flags
.q
.explicit_image_format
&&
4934 this->type
->specifier
->type
->is_image() &&
4935 this->type
->qualifier
.image_base_type
== GLSL_TYPE_VOID
) {
4936 /* "The ARB_shader_image_load_store says:
4937 * If both extensions are enabled in the shading language, the "size*" layout
4938 * qualifiers are treated as format qualifiers, and are mapped to equivalent
4939 * format qualifiers in the table below, according to the type of image
4941 * image* iimage* uimage*
4942 * -------- -------- --------
4943 * size1x8 n/a r8i r8ui
4944 * size1x16 r16f r16i r16ui
4945 * size1x32 r32f r32i r32ui
4946 * size2x32 rg32f rg32i rg32ui
4947 * size4x32 rgba32f rgba32i rgba32ui"
4949 if (strncmp(this->type
->specifier
->type_name
, "image", strlen("image")) == 0) {
4950 switch (this->type
->qualifier
.image_format
) {
4951 case PIPE_FORMAT_R8_SINT
:
4952 /* No valid qualifier in this case, driver will need to look at
4953 * the underlying image's format (just like no qualifier being
4956 this->type
->qualifier
.image_format
= PIPE_FORMAT_NONE
;
4958 case PIPE_FORMAT_R16_SINT
:
4959 this->type
->qualifier
.image_format
= PIPE_FORMAT_R16_FLOAT
;
4961 case PIPE_FORMAT_R32_SINT
:
4962 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32_FLOAT
;
4964 case PIPE_FORMAT_R32G32_SINT
:
4965 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32G32_FLOAT
;
4967 case PIPE_FORMAT_R32G32B32A32_SINT
:
4968 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32G32B32A32_FLOAT
;
4971 unreachable("Unknown image format");
4973 this->type
->qualifier
.image_base_type
= GLSL_TYPE_FLOAT
;
4974 } else if (strncmp(this->type
->specifier
->type_name
, "uimage", strlen("uimage")) == 0) {
4975 switch (this->type
->qualifier
.image_format
) {
4976 case PIPE_FORMAT_R8_SINT
:
4977 this->type
->qualifier
.image_format
= PIPE_FORMAT_R8_UINT
;
4979 case PIPE_FORMAT_R16_SINT
:
4980 this->type
->qualifier
.image_format
= PIPE_FORMAT_R16_UINT
;
4982 case PIPE_FORMAT_R32_SINT
:
4983 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32_UINT
;
4985 case PIPE_FORMAT_R32G32_SINT
:
4986 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32G32_UINT
;
4988 case PIPE_FORMAT_R32G32B32A32_SINT
:
4989 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32G32B32A32_UINT
;
4992 unreachable("Unknown image format");
4994 this->type
->qualifier
.image_base_type
= GLSL_TYPE_UINT
;
4995 } else if (strncmp(this->type
->specifier
->type_name
, "iimage", strlen("iimage")) == 0) {
4996 this->type
->qualifier
.image_base_type
= GLSL_TYPE_INT
;
5002 /* The type specifier may contain a structure definition. Process that
5003 * before any of the variable declarations.
5005 (void) this->type
->specifier
->hir(instructions
, state
);
5007 decl_type
= this->type
->glsl_type(& type_name
, state
);
5009 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
5010 * "Buffer variables may only be declared inside interface blocks
5011 * (section 4.3.9 “Interface Blocks”), which are then referred to as
5012 * shader storage blocks. It is a compile-time error to declare buffer
5013 * variables at global scope (outside a block)."
5015 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
5016 _mesa_glsl_error(&loc
, state
,
5017 "buffer variables cannot be declared outside "
5018 "interface blocks");
5021 /* An offset-qualified atomic counter declaration sets the default
5022 * offset for the next declaration within the same atomic counter
5025 if (decl_type
&& decl_type
->contains_atomic()) {
5026 if (type
->qualifier
.flags
.q
.explicit_binding
&&
5027 type
->qualifier
.flags
.q
.explicit_offset
) {
5028 unsigned qual_binding
;
5029 unsigned qual_offset
;
5030 if (process_qualifier_constant(state
, &loc
, "binding",
5031 type
->qualifier
.binding
,
5033 && process_qualifier_constant(state
, &loc
, "offset",
5034 type
->qualifier
.offset
,
5036 if (qual_binding
< ARRAY_SIZE(state
->atomic_counter_offsets
))
5037 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
5041 ast_type_qualifier allowed_atomic_qual_mask
;
5042 allowed_atomic_qual_mask
.flags
.i
= 0;
5043 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
5044 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
5045 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
5047 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
5048 "invalid layout qualifier for",
5052 if (this->declarations
.is_empty()) {
5053 /* If there is no structure involved in the program text, there are two
5054 * possible scenarios:
5056 * - The program text contained something like 'vec4;'. This is an
5057 * empty declaration. It is valid but weird. Emit a warning.
5059 * - The program text contained something like 'S;' and 'S' is not the
5060 * name of a known structure type. This is both invalid and weird.
5063 * - The program text contained something like 'mediump float;'
5064 * when the programmer probably meant 'precision mediump
5065 * float;' Emit a warning with a description of what they
5066 * probably meant to do.
5068 * Note that if decl_type is NULL and there is a structure involved,
5069 * there must have been some sort of error with the structure. In this
5070 * case we assume that an error was already generated on this line of
5071 * code for the structure. There is no need to generate an additional,
5074 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
5077 if (decl_type
== NULL
) {
5078 _mesa_glsl_error(&loc
, state
,
5079 "invalid type `%s' in empty declaration",
5082 if (decl_type
->is_array()) {
5083 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
5086 * "... any declaration that leaves the size undefined is
5087 * disallowed as this would add complexity and there are no
5090 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
5091 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
5092 "or implicitly defined");
5095 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
5097 * "The combinations of types and qualifiers that cause
5098 * compile-time or link-time errors are the same whether or not
5099 * the declaration is empty."
5101 validate_array_dimensions(decl_type
, state
, &loc
);
5104 if (decl_type
->is_atomic_uint()) {
5105 /* Empty atomic counter declarations are allowed and useful
5106 * to set the default offset qualifier.
5109 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5110 if (this->type
->specifier
->structure
!= NULL
) {
5111 _mesa_glsl_error(&loc
, state
,
5112 "precision qualifiers can't be applied "
5115 static const char *const precision_names
[] = {
5122 _mesa_glsl_warning(&loc
, state
,
5123 "empty declaration with precision "
5124 "qualifier, to set the default precision, "
5125 "use `precision %s %s;'",
5126 precision_names
[this->type
->
5127 qualifier
.precision
],
5130 } else if (this->type
->specifier
->structure
== NULL
) {
5131 _mesa_glsl_warning(&loc
, state
, "empty declaration");
5136 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
5137 const struct glsl_type
*var_type
;
5139 const char *identifier
= decl
->identifier
;
5140 /* FINISHME: Emit a warning if a variable declaration shadows a
5141 * FINISHME: declaration at a higher scope.
5144 if ((decl_type
== NULL
) || decl_type
->is_void()) {
5145 if (type_name
!= NULL
) {
5146 _mesa_glsl_error(& loc
, state
,
5147 "invalid type `%s' in declaration of `%s'",
5148 type_name
, decl
->identifier
);
5150 _mesa_glsl_error(& loc
, state
,
5151 "invalid type in declaration of `%s'",
5157 if (this->type
->qualifier
.is_subroutine_decl()) {
5161 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
5163 _mesa_glsl_error(& loc
, state
,
5164 "invalid type in declaration of `%s'",
5166 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
5171 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
5174 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
5176 /* The 'varying in' and 'varying out' qualifiers can only be used with
5177 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
5180 if (this->type
->qualifier
.flags
.q
.varying
) {
5181 if (this->type
->qualifier
.flags
.q
.in
) {
5182 _mesa_glsl_error(& loc
, state
,
5183 "`varying in' qualifier in declaration of "
5184 "`%s' only valid for geometry shaders using "
5185 "ARB_geometry_shader4 or EXT_geometry_shader4",
5187 } else if (this->type
->qualifier
.flags
.q
.out
) {
5188 _mesa_glsl_error(& loc
, state
,
5189 "`varying out' qualifier in declaration of "
5190 "`%s' only valid for geometry shaders using "
5191 "ARB_geometry_shader4 or EXT_geometry_shader4",
5196 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
5198 * "Global variables can only use the qualifiers const,
5199 * attribute, uniform, or varying. Only one may be
5202 * Local variables can only use the qualifier const."
5204 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
5205 * any extension that adds the 'layout' keyword.
5207 if (!state
->is_version(130, 300)
5208 && !state
->has_explicit_attrib_location()
5209 && !state
->has_separate_shader_objects()
5210 && !state
->ARB_fragment_coord_conventions_enable
) {
5211 /* GL_EXT_gpu_shader4 only allows "varying out" on fragment shader
5212 * outputs. (the varying flag is not set by the parser)
5214 if (this->type
->qualifier
.flags
.q
.out
&&
5215 (!state
->EXT_gpu_shader4_enable
||
5216 state
->stage
!= MESA_SHADER_FRAGMENT
)) {
5217 _mesa_glsl_error(& loc
, state
,
5218 "`out' qualifier in declaration of `%s' "
5219 "only valid for function parameters in %s",
5220 decl
->identifier
, state
->get_version_string());
5222 if (this->type
->qualifier
.flags
.q
.in
) {
5223 _mesa_glsl_error(& loc
, state
,
5224 "`in' qualifier in declaration of `%s' "
5225 "only valid for function parameters in %s",
5226 decl
->identifier
, state
->get_version_string());
5228 /* FINISHME: Test for other invalid qualifiers. */
5231 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
5233 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
5236 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
5237 || var
->data
.mode
== ir_var_shader_out
)
5238 && (var
->type
->is_numeric() || var
->type
->is_boolean())
5239 && state
->zero_init
) {
5240 const ir_constant_data data
= { { 0 } };
5241 var
->data
.has_initializer
= true;
5242 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
5245 if (this->type
->qualifier
.flags
.q
.invariant
) {
5246 if (!is_allowed_invariant(var
, state
)) {
5247 _mesa_glsl_error(&loc
, state
,
5248 "`%s' cannot be marked invariant; interfaces between "
5249 "shader stages only", var
->name
);
5253 if (state
->current_function
!= NULL
) {
5254 const char *mode
= NULL
;
5255 const char *extra
= "";
5257 /* There is no need to check for 'inout' here because the parser will
5258 * only allow that in function parameter lists.
5260 if (this->type
->qualifier
.flags
.q
.attribute
) {
5262 } else if (this->type
->qualifier
.is_subroutine_decl()) {
5263 mode
= "subroutine uniform";
5264 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
5266 } else if (this->type
->qualifier
.flags
.q
.varying
) {
5268 } else if (this->type
->qualifier
.flags
.q
.in
) {
5270 extra
= " or in function parameter list";
5271 } else if (this->type
->qualifier
.flags
.q
.out
) {
5273 extra
= " or in function parameter list";
5277 _mesa_glsl_error(& loc
, state
,
5278 "%s variable `%s' must be declared at "
5280 mode
, var
->name
, extra
);
5282 } else if (var
->data
.mode
== ir_var_shader_in
) {
5283 var
->data
.read_only
= true;
5285 if (state
->stage
== MESA_SHADER_VERTEX
) {
5286 bool error_emitted
= false;
5288 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
5290 * "Vertex shader inputs can only be float, floating-point
5291 * vectors, matrices, signed and unsigned integers and integer
5292 * vectors. Vertex shader inputs can also form arrays of these
5293 * types, but not structures."
5295 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
5297 * "Vertex shader inputs can only be float, floating-point
5298 * vectors, matrices, signed and unsigned integers and integer
5299 * vectors. They cannot be arrays or structures."
5301 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
5303 * "The attribute qualifier can be used only with float,
5304 * floating-point vectors, and matrices. Attribute variables
5305 * cannot be declared as arrays or structures."
5307 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
5309 * "Vertex shader inputs can only be float, floating-point
5310 * vectors, matrices, signed and unsigned integers and integer
5311 * vectors. Vertex shader inputs cannot be arrays or
5314 * From section 4.3.4 of the ARB_bindless_texture spec:
5316 * "(modify third paragraph of the section to allow sampler and
5317 * image types) ... Vertex shader inputs can only be float,
5318 * single-precision floating-point scalars, single-precision
5319 * floating-point vectors, matrices, signed and unsigned
5320 * integers and integer vectors, sampler and image types."
5322 const glsl_type
*check_type
= var
->type
->without_array();
5324 switch (check_type
->base_type
) {
5325 case GLSL_TYPE_FLOAT
:
5327 case GLSL_TYPE_UINT64
:
5328 case GLSL_TYPE_INT64
:
5330 case GLSL_TYPE_UINT
:
5332 if (state
->is_version(120, 300) || state
->EXT_gpu_shader4_enable
)
5334 case GLSL_TYPE_DOUBLE
:
5335 if (check_type
->is_double() && (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
5337 case GLSL_TYPE_SAMPLER
:
5338 if (check_type
->is_sampler() && state
->has_bindless())
5340 case GLSL_TYPE_IMAGE
:
5341 if (check_type
->is_image() && state
->has_bindless())
5345 _mesa_glsl_error(& loc
, state
,
5346 "vertex shader input / attribute cannot have "
5348 var
->type
->is_array() ? "array of " : "",
5350 error_emitted
= true;
5353 if (!error_emitted
&& var
->type
->is_array() &&
5354 !state
->check_version(150, 0, &loc
,
5355 "vertex shader input / attribute "
5356 "cannot have array type")) {
5357 error_emitted
= true;
5359 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
5360 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5362 * Geometry shader input variables get the per-vertex values
5363 * written out by vertex shader output variables of the same
5364 * names. Since a geometry shader operates on a set of
5365 * vertices, each input varying variable (or input block, see
5366 * interface blocks below) needs to be declared as an array.
5368 if (!var
->type
->is_array()) {
5369 _mesa_glsl_error(&loc
, state
,
5370 "geometry shader inputs must be arrays");
5373 handle_geometry_shader_input_decl(state
, loc
, var
);
5374 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5375 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5377 * It is a compile-time error to declare a fragment shader
5378 * input with, or that contains, any of the following types:
5382 * * An array of arrays
5383 * * An array of structures
5384 * * A structure containing an array
5385 * * A structure containing a structure
5387 if (state
->es_shader
) {
5388 const glsl_type
*check_type
= var
->type
->without_array();
5389 if (check_type
->is_boolean() ||
5390 check_type
->contains_opaque()) {
5391 _mesa_glsl_error(&loc
, state
,
5392 "fragment shader input cannot have type %s",
5395 if (var
->type
->is_array() &&
5396 var
->type
->fields
.array
->is_array()) {
5397 _mesa_glsl_error(&loc
, state
,
5399 "cannot have an array of arrays",
5400 _mesa_shader_stage_to_string(state
->stage
));
5402 if (var
->type
->is_array() &&
5403 var
->type
->fields
.array
->is_struct()) {
5404 _mesa_glsl_error(&loc
, state
,
5405 "fragment shader input "
5406 "cannot have an array of structs");
5408 if (var
->type
->is_struct()) {
5409 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5410 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5411 var
->type
->fields
.structure
[i
].type
->is_struct())
5412 _mesa_glsl_error(&loc
, state
,
5413 "fragment shader input cannot have "
5414 "a struct that contains an "
5419 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5420 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5421 handle_tess_shader_input_decl(state
, loc
, var
);
5423 } else if (var
->data
.mode
== ir_var_shader_out
) {
5424 const glsl_type
*check_type
= var
->type
->without_array();
5426 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5428 * It is a compile-time error to declare a fragment shader output
5429 * that contains any of the following:
5431 * * A Boolean type (bool, bvec2 ...)
5432 * * A double-precision scalar or vector (double, dvec2 ...)
5437 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5438 if (check_type
->is_struct() || check_type
->is_matrix())
5439 _mesa_glsl_error(&loc
, state
,
5440 "fragment shader output "
5441 "cannot have struct or matrix type");
5442 switch (check_type
->base_type
) {
5443 case GLSL_TYPE_UINT
:
5445 case GLSL_TYPE_FLOAT
:
5448 _mesa_glsl_error(&loc
, state
,
5449 "fragment shader output cannot have "
5450 "type %s", check_type
->name
);
5454 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5456 * It is a compile-time error to declare a vertex shader output
5457 * with, or that contains, any of the following types:
5461 * * An array of arrays
5462 * * An array of structures
5463 * * A structure containing an array
5464 * * A structure containing a structure
5466 * It is a compile-time error to declare a fragment shader output
5467 * with, or that contains, any of the following types:
5473 * * An array of array
5475 * ES 3.20 updates this to apply to tessellation and geometry shaders
5476 * as well. Because there are per-vertex arrays in the new stages,
5477 * it strikes the "array of..." rules and replaces them with these:
5479 * * For per-vertex-arrayed variables (applies to tessellation
5480 * control, tessellation evaluation and geometry shaders):
5482 * * Per-vertex-arrayed arrays of arrays
5483 * * Per-vertex-arrayed arrays of structures
5485 * * For non-per-vertex-arrayed variables:
5487 * * An array of arrays
5488 * * An array of structures
5490 * which basically says to unwrap the per-vertex aspect and apply
5493 if (state
->es_shader
) {
5494 if (var
->type
->is_array() &&
5495 var
->type
->fields
.array
->is_array()) {
5496 _mesa_glsl_error(&loc
, state
,
5498 "cannot have an array of arrays",
5499 _mesa_shader_stage_to_string(state
->stage
));
5501 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5502 const glsl_type
*type
= var
->type
;
5504 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5505 !var
->data
.patch
&& var
->type
->is_array()) {
5506 type
= var
->type
->fields
.array
;
5509 if (type
->is_array() && type
->fields
.array
->is_struct()) {
5510 _mesa_glsl_error(&loc
, state
,
5511 "%s shader output cannot have "
5512 "an array of structs",
5513 _mesa_shader_stage_to_string(state
->stage
));
5515 if (type
->is_struct()) {
5516 for (unsigned i
= 0; i
< type
->length
; i
++) {
5517 if (type
->fields
.structure
[i
].type
->is_array() ||
5518 type
->fields
.structure
[i
].type
->is_struct())
5519 _mesa_glsl_error(&loc
, state
,
5520 "%s shader output cannot have a "
5521 "struct that contains an "
5523 _mesa_shader_stage_to_string(state
->stage
));
5529 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5530 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5532 } else if (var
->type
->contains_subroutine()) {
5533 /* declare subroutine uniforms as hidden */
5534 var
->data
.how_declared
= ir_var_hidden
;
5537 /* From section 4.3.4 of the GLSL 4.00 spec:
5538 * "Input variables may not be declared using the patch in qualifier
5539 * in tessellation control or geometry shaders."
5541 * From section 4.3.6 of the GLSL 4.00 spec:
5542 * "It is an error to use patch out in a vertex, tessellation
5543 * evaluation, or geometry shader."
5545 * This doesn't explicitly forbid using them in a fragment shader, but
5546 * that's probably just an oversight.
5548 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5549 && this->type
->qualifier
.flags
.q
.patch
5550 && this->type
->qualifier
.flags
.q
.in
) {
5552 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5553 "tessellation evaluation shader");
5556 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5557 && this->type
->qualifier
.flags
.q
.patch
5558 && this->type
->qualifier
.flags
.q
.out
) {
5560 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5561 "tessellation control shader");
5564 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5566 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5567 state
->check_precision_qualifiers_allowed(&loc
);
5570 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5571 !precision_qualifier_allowed(var
->type
)) {
5572 _mesa_glsl_error(&loc
, state
,
5573 "precision qualifiers apply only to floating point"
5574 ", integer and opaque types");
5577 /* From section 4.1.7 of the GLSL 4.40 spec:
5579 * "[Opaque types] can only be declared as function
5580 * parameters or uniform-qualified variables."
5582 * From section 4.1.7 of the ARB_bindless_texture spec:
5584 * "Samplers may be declared as shader inputs and outputs, as uniform
5585 * variables, as temporary variables, and as function parameters."
5587 * From section 4.1.X of the ARB_bindless_texture spec:
5589 * "Images may be declared as shader inputs and outputs, as uniform
5590 * variables, as temporary variables, and as function parameters."
5592 if (!this->type
->qualifier
.flags
.q
.uniform
&&
5593 (var_type
->contains_atomic() ||
5594 (!state
->has_bindless() && var_type
->contains_opaque()))) {
5595 _mesa_glsl_error(&loc
, state
,
5596 "%s variables must be declared uniform",
5597 state
->has_bindless() ? "atomic" : "opaque");
5600 /* Process the initializer and add its instructions to a temporary
5601 * list. This list will be added to the instruction stream (below) after
5602 * the declaration is added. This is done because in some cases (such as
5603 * redeclarations) the declaration may not actually be added to the
5604 * instruction stream.
5606 exec_list initializer_instructions
;
5608 /* Examine var name here since var may get deleted in the next call */
5609 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5611 bool is_redeclaration
;
5612 var
= get_variable_being_redeclared(&var
, decl
->get_location(), state
,
5613 false /* allow_all_redeclarations */,
5615 if (is_redeclaration
) {
5617 var
->data
.how_declared
== ir_var_declared_in_block
) {
5618 _mesa_glsl_error(&loc
, state
,
5619 "`%s' has already been redeclared using "
5620 "gl_PerVertex", var
->name
);
5622 var
->data
.how_declared
= ir_var_declared_normally
;
5625 if (decl
->initializer
!= NULL
) {
5626 result
= process_initializer(var
,
5628 &initializer_instructions
, state
);
5630 validate_array_dimensions(var_type
, state
, &loc
);
5633 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5635 * "It is an error to write to a const variable outside of
5636 * its declaration, so they must be initialized when
5639 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5640 _mesa_glsl_error(& loc
, state
,
5641 "const declaration of `%s' must be initialized",
5645 if (state
->es_shader
) {
5646 const glsl_type
*const t
= var
->type
;
5648 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5650 * The GL_OES_tessellation_shader spec says about inputs:
5652 * "Declaring an array size is optional. If no size is specified,
5653 * it will be taken from the implementation-dependent maximum
5654 * patch size (gl_MaxPatchVertices)."
5656 * and about TCS outputs:
5658 * "If no size is specified, it will be taken from output patch
5659 * size declared in the shader."
5661 * The GL_OES_geometry_shader spec says:
5663 * "All geometry shader input unsized array declarations will be
5664 * sized by an earlier input primitive layout qualifier, when
5665 * present, as per the following table."
5667 const bool implicitly_sized
=
5668 (var
->data
.mode
== ir_var_shader_in
&&
5669 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5670 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5671 (var
->data
.mode
== ir_var_shader_out
&&
5672 state
->stage
== MESA_SHADER_TESS_CTRL
);
5674 if (t
->is_unsized_array() && !implicitly_sized
)
5675 /* Section 10.17 of the GLSL ES 1.00 specification states that
5676 * unsized array declarations have been removed from the language.
5677 * Arrays that are sized using an initializer are still explicitly
5678 * sized. However, GLSL ES 1.00 does not allow array
5679 * initializers. That is only allowed in GLSL ES 3.00.
5681 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5683 * "An array type can also be formed without specifying a size
5684 * if the definition includes an initializer:
5686 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5687 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5692 _mesa_glsl_error(& loc
, state
,
5693 "unsized array declarations are not allowed in "
5697 /* Section 4.4.6.1 Atomic Counter Layout Qualifiers of the GLSL 4.60 spec:
5699 * "It is a compile-time error to declare an unsized array of
5702 if (var
->type
->is_unsized_array() &&
5703 var
->type
->without_array()->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
5704 _mesa_glsl_error(& loc
, state
,
5705 "Unsized array of atomic_uint is not allowed");
5708 /* If the declaration is not a redeclaration, there are a few additional
5709 * semantic checks that must be applied. In addition, variable that was
5710 * created for the declaration should be added to the IR stream.
5712 if (!is_redeclaration
) {
5713 validate_identifier(decl
->identifier
, loc
, state
);
5715 /* Add the variable to the symbol table. Note that the initializer's
5716 * IR was already processed earlier (though it hasn't been emitted
5717 * yet), without the variable in scope.
5719 * This differs from most C-like languages, but it follows the GLSL
5720 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5723 * "Within a declaration, the scope of a name starts immediately
5724 * after the initializer if present or immediately after the name
5725 * being declared if not."
5727 if (!state
->symbols
->add_variable(var
)) {
5728 YYLTYPE loc
= this->get_location();
5729 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5730 "current scope", decl
->identifier
);
5734 /* Push the variable declaration to the top. It means that all the
5735 * variable declarations will appear in a funny last-to-first order,
5736 * but otherwise we run into trouble if a function is prototyped, a
5737 * global var is decled, then the function is defined with usage of
5738 * the global var. See glslparsertest's CorrectModule.frag.
5740 instructions
->push_head(var
);
5743 instructions
->append_list(&initializer_instructions
);
5747 /* Generally, variable declarations do not have r-values. However,
5748 * one is used for the declaration in
5750 * while (bool b = some_condition()) {
5754 * so we return the rvalue from the last seen declaration here.
5761 ast_parameter_declarator::hir(exec_list
*instructions
,
5762 struct _mesa_glsl_parse_state
*state
)
5765 const struct glsl_type
*type
;
5766 const char *name
= NULL
;
5767 YYLTYPE loc
= this->get_location();
5769 type
= this->type
->glsl_type(& name
, state
);
5773 _mesa_glsl_error(& loc
, state
,
5774 "invalid type `%s' in declaration of `%s'",
5775 name
, this->identifier
);
5777 _mesa_glsl_error(& loc
, state
,
5778 "invalid type in declaration of `%s'",
5782 type
= glsl_type::error_type
;
5785 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5787 * "Functions that accept no input arguments need not use void in the
5788 * argument list because prototypes (or definitions) are required and
5789 * therefore there is no ambiguity when an empty argument list "( )" is
5790 * declared. The idiom "(void)" as a parameter list is provided for
5793 * Placing this check here prevents a void parameter being set up
5794 * for a function, which avoids tripping up checks for main taking
5795 * parameters and lookups of an unnamed symbol.
5797 if (type
->is_void()) {
5798 if (this->identifier
!= NULL
)
5799 _mesa_glsl_error(& loc
, state
,
5800 "named parameter cannot have type `void'");
5806 if (formal_parameter
&& (this->identifier
== NULL
)) {
5807 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5811 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5812 * call already handled the "vec4[..] foo" case.
5814 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5816 if (!type
->is_error() && type
->is_unsized_array()) {
5817 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5819 type
= glsl_type::error_type
;
5823 ir_variable
*var
= new(ctx
)
5824 ir_variable(type
, this->identifier
, ir_var_function_in
);
5826 /* Apply any specified qualifiers to the parameter declaration. Note that
5827 * for function parameters the default mode is 'in'.
5829 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5832 /* From section 4.1.7 of the GLSL 4.40 spec:
5834 * "Opaque variables cannot be treated as l-values; hence cannot
5835 * be used as out or inout function parameters, nor can they be
5838 * From section 4.1.7 of the ARB_bindless_texture spec:
5840 * "Samplers can be used as l-values, so can be assigned into and used
5841 * as "out" and "inout" function parameters."
5843 * From section 4.1.X of the ARB_bindless_texture spec:
5845 * "Images can be used as l-values, so can be assigned into and used as
5846 * "out" and "inout" function parameters."
5848 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5849 && (type
->contains_atomic() ||
5850 (!state
->has_bindless() && type
->contains_opaque()))) {
5851 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5852 "contain %s variables",
5853 state
->has_bindless() ? "atomic" : "opaque");
5854 type
= glsl_type::error_type
;
5857 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5859 * "When calling a function, expressions that do not evaluate to
5860 * l-values cannot be passed to parameters declared as out or inout."
5862 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5864 * "Other binary or unary expressions, non-dereferenced arrays,
5865 * function names, swizzles with repeated fields, and constants
5866 * cannot be l-values."
5868 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5869 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5871 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5873 && !state
->check_version(120, 100, &loc
,
5874 "arrays cannot be out or inout parameters")) {
5875 type
= glsl_type::error_type
;
5878 instructions
->push_tail(var
);
5880 /* Parameter declarations do not have r-values.
5887 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5889 exec_list
*ir_parameters
,
5890 _mesa_glsl_parse_state
*state
)
5892 ast_parameter_declarator
*void_param
= NULL
;
5895 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5896 param
->formal_parameter
= formal
;
5897 param
->hir(ir_parameters
, state
);
5905 if ((void_param
!= NULL
) && (count
> 1)) {
5906 YYLTYPE loc
= void_param
->get_location();
5908 _mesa_glsl_error(& loc
, state
,
5909 "`void' parameter must be only parameter");
5915 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5917 /* IR invariants disallow function declarations or definitions
5918 * nested within other function definitions. But there is no
5919 * requirement about the relative order of function declarations
5920 * and definitions with respect to one another. So simply insert
5921 * the new ir_function block at the end of the toplevel instruction
5924 state
->toplevel_ir
->push_tail(f
);
5929 ast_function::hir(exec_list
*instructions
,
5930 struct _mesa_glsl_parse_state
*state
)
5933 ir_function
*f
= NULL
;
5934 ir_function_signature
*sig
= NULL
;
5935 exec_list hir_parameters
;
5936 YYLTYPE loc
= this->get_location();
5938 const char *const name
= identifier
;
5940 /* New functions are always added to the top-level IR instruction stream,
5941 * so this instruction list pointer is ignored. See also emit_function
5944 (void) instructions
;
5946 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5948 * "Function declarations (prototypes) cannot occur inside of functions;
5949 * they must be at global scope, or for the built-in functions, outside
5950 * the global scope."
5952 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5954 * "User defined functions may only be defined within the global scope."
5956 * Note that this language does not appear in GLSL 1.10.
5958 if ((state
->current_function
!= NULL
) &&
5959 state
->is_version(120, 100)) {
5960 YYLTYPE loc
= this->get_location();
5961 _mesa_glsl_error(&loc
, state
,
5962 "declaration of function `%s' not allowed within "
5963 "function body", name
);
5966 validate_identifier(name
, this->get_location(), state
);
5968 /* Convert the list of function parameters to HIR now so that they can be
5969 * used below to compare this function's signature with previously seen
5970 * signatures for functions with the same name.
5972 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5974 & hir_parameters
, state
);
5976 const char *return_type_name
;
5977 const glsl_type
*return_type
=
5978 this->return_type
->glsl_type(& return_type_name
, state
);
5981 YYLTYPE loc
= this->get_location();
5982 _mesa_glsl_error(&loc
, state
,
5983 "function `%s' has undeclared return type `%s'",
5984 name
, return_type_name
);
5985 return_type
= glsl_type::error_type
;
5988 /* ARB_shader_subroutine states:
5989 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5990 * subroutine(...) to a function declaration."
5992 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
5993 YYLTYPE loc
= this->get_location();
5994 _mesa_glsl_error(&loc
, state
,
5995 "function declaration `%s' cannot have subroutine prepended",
5999 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
6000 * "No qualifier is allowed on the return type of a function."
6002 if (this->return_type
->has_qualifiers(state
)) {
6003 YYLTYPE loc
= this->get_location();
6004 _mesa_glsl_error(& loc
, state
,
6005 "function `%s' return type has qualifiers", name
);
6008 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
6010 * "Arrays are allowed as arguments and as the return type. In both
6011 * cases, the array must be explicitly sized."
6013 if (return_type
->is_unsized_array()) {
6014 YYLTYPE loc
= this->get_location();
6015 _mesa_glsl_error(& loc
, state
,
6016 "function `%s' return type array must be explicitly "
6020 /* From Section 6.1 (Function Definitions) of the GLSL 1.00 spec:
6022 * "Arrays are allowed as arguments, but not as the return type. [...]
6023 * The return type can also be a structure if the structure does not
6024 * contain an array."
6026 if (state
->language_version
== 100 && return_type
->contains_array()) {
6027 YYLTYPE loc
= this->get_location();
6028 _mesa_glsl_error(& loc
, state
,
6029 "function `%s' return type contains an array", name
);
6032 /* From section 4.1.7 of the GLSL 4.40 spec:
6034 * "[Opaque types] can only be declared as function parameters
6035 * or uniform-qualified variables."
6037 * The ARB_bindless_texture spec doesn't clearly state this, but as it says
6038 * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X,
6039 * (Images)", this should be allowed.
6041 if (return_type
->contains_atomic() ||
6042 (!state
->has_bindless() && return_type
->contains_opaque())) {
6043 YYLTYPE loc
= this->get_location();
6044 _mesa_glsl_error(&loc
, state
,
6045 "function `%s' return type can't contain an %s type",
6046 name
, state
->has_bindless() ? "atomic" : "opaque");
6050 if (return_type
->is_subroutine()) {
6051 YYLTYPE loc
= this->get_location();
6052 _mesa_glsl_error(&loc
, state
,
6053 "function `%s' return type can't be a subroutine type",
6057 /* Get the precision for the return type */
6058 unsigned return_precision
;
6060 if (state
->es_shader
) {
6061 YYLTYPE loc
= this->get_location();
6063 select_gles_precision(this->return_type
->qualifier
.precision
,
6068 return_precision
= GLSL_PRECISION_NONE
;
6071 /* Create an ir_function if one doesn't already exist. */
6072 f
= state
->symbols
->get_function(name
);
6074 f
= new(ctx
) ir_function(name
);
6075 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
6076 if (!state
->symbols
->add_function(f
)) {
6077 /* This function name shadows a non-function use of the same name. */
6078 YYLTYPE loc
= this->get_location();
6079 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
6080 "non-function", name
);
6084 emit_function(state
, f
);
6087 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
6089 * "A shader cannot redefine or overload built-in functions."
6091 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
6093 * "User code can overload the built-in functions but cannot redefine
6096 if (state
->es_shader
) {
6097 /* Local shader has no exact candidates; check the built-ins. */
6098 if (state
->language_version
>= 300 &&
6099 _mesa_glsl_has_builtin_function(state
, name
)) {
6100 YYLTYPE loc
= this->get_location();
6101 _mesa_glsl_error(& loc
, state
,
6102 "A shader cannot redefine or overload built-in "
6103 "function `%s' in GLSL ES 3.00", name
);
6107 if (state
->language_version
== 100) {
6108 ir_function_signature
*sig
=
6109 _mesa_glsl_find_builtin_function(state
, name
, &hir_parameters
);
6110 if (sig
&& sig
->is_builtin()) {
6111 _mesa_glsl_error(& loc
, state
,
6112 "A shader cannot redefine built-in "
6113 "function `%s' in GLSL ES 1.00", name
);
6118 /* Verify that this function's signature either doesn't match a previously
6119 * seen signature for a function with the same name, or, if a match is found,
6120 * that the previously seen signature does not have an associated definition.
6122 if (state
->es_shader
|| f
->has_user_signature()) {
6123 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
6125 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
6126 if (badvar
!= NULL
) {
6127 YYLTYPE loc
= this->get_location();
6129 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
6130 "qualifiers don't match prototype", name
, badvar
);
6133 if (sig
->return_type
!= return_type
) {
6134 YYLTYPE loc
= this->get_location();
6136 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
6137 "match prototype", name
);
6140 if (sig
->return_precision
!= return_precision
) {
6141 YYLTYPE loc
= this->get_location();
6143 _mesa_glsl_error(&loc
, state
, "function `%s' return type precision "
6144 "doesn't match prototype", name
);
6147 if (sig
->is_defined
) {
6148 if (is_definition
) {
6149 YYLTYPE loc
= this->get_location();
6150 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
6152 /* We just encountered a prototype that exactly matches a
6153 * function that's already been defined. This is redundant,
6154 * and we should ignore it.
6158 } else if (state
->language_version
== 100 && !is_definition
) {
6159 /* From the GLSL 1.00 spec, section 4.2.7:
6161 * "A particular variable, structure or function declaration
6162 * may occur at most once within a scope with the exception
6163 * that a single function prototype plus the corresponding
6164 * function definition are allowed."
6166 YYLTYPE loc
= this->get_location();
6167 _mesa_glsl_error(&loc
, state
, "function `%s' redeclared", name
);
6172 /* Verify the return type of main() */
6173 if (strcmp(name
, "main") == 0) {
6174 if (! return_type
->is_void()) {
6175 YYLTYPE loc
= this->get_location();
6177 _mesa_glsl_error(& loc
, state
, "main() must return void");
6180 if (!hir_parameters
.is_empty()) {
6181 YYLTYPE loc
= this->get_location();
6183 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
6187 /* Finish storing the information about this new function in its signature.
6190 sig
= new(ctx
) ir_function_signature(return_type
);
6191 sig
->return_precision
= return_precision
;
6192 f
->add_signature(sig
);
6195 sig
->replace_parameters(&hir_parameters
);
6198 if (this->return_type
->qualifier
.subroutine_list
) {
6201 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
6202 unsigned qual_index
;
6203 if (process_qualifier_constant(state
, &loc
, "index",
6204 this->return_type
->qualifier
.index
,
6206 if (!state
->has_explicit_uniform_location()) {
6207 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
6208 "GL_ARB_explicit_uniform_location or "
6210 } else if (qual_index
>= MAX_SUBROUTINES
) {
6211 _mesa_glsl_error(&loc
, state
,
6212 "invalid subroutine index (%d) index must "
6213 "be a number between 0 and "
6214 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
6215 MAX_SUBROUTINES
- 1);
6217 f
->subroutine_index
= qual_index
;
6222 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
6223 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
6224 f
->num_subroutine_types
);
6226 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
6227 const struct glsl_type
*type
;
6228 /* the subroutine type must be already declared */
6229 type
= state
->symbols
->get_type(decl
->identifier
);
6231 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
6234 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
6235 ir_function
*fn
= state
->subroutine_types
[i
];
6236 ir_function_signature
*tsig
= NULL
;
6238 if (strcmp(fn
->name
, decl
->identifier
))
6241 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
6244 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
6246 if (tsig
->return_type
!= sig
->return_type
) {
6247 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
6251 f
->subroutine_types
[idx
++] = type
;
6253 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
6255 state
->num_subroutines
+ 1);
6256 state
->subroutines
[state
->num_subroutines
] = f
;
6257 state
->num_subroutines
++;
6261 if (this->return_type
->qualifier
.is_subroutine_decl()) {
6262 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
6263 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
6266 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
6268 state
->num_subroutine_types
+ 1);
6269 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
6270 state
->num_subroutine_types
++;
6272 f
->is_subroutine
= true;
6275 /* Function declarations (prototypes) do not have r-values.
6282 ast_function_definition::hir(exec_list
*instructions
,
6283 struct _mesa_glsl_parse_state
*state
)
6285 prototype
->is_definition
= true;
6286 prototype
->hir(instructions
, state
);
6288 ir_function_signature
*signature
= prototype
->signature
;
6289 if (signature
== NULL
)
6292 assert(state
->current_function
== NULL
);
6293 state
->current_function
= signature
;
6294 state
->found_return
= false;
6295 state
->found_begin_interlock
= false;
6296 state
->found_end_interlock
= false;
6298 /* Duplicate parameters declared in the prototype as concrete variables.
6299 * Add these to the symbol table.
6301 state
->symbols
->push_scope();
6302 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
6303 assert(var
->as_variable() != NULL
);
6305 /* The only way a parameter would "exist" is if two parameters have
6308 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
6309 YYLTYPE loc
= this->get_location();
6311 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
6313 state
->symbols
->add_variable(var
);
6317 /* Convert the body of the function to HIR. */
6318 this->body
->hir(&signature
->body
, state
);
6319 signature
->is_defined
= true;
6321 state
->symbols
->pop_scope();
6323 assert(state
->current_function
== signature
);
6324 state
->current_function
= NULL
;
6326 if (!signature
->return_type
->is_void() && !state
->found_return
) {
6327 YYLTYPE loc
= this->get_location();
6328 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
6329 "%s, but no return statement",
6330 signature
->function_name(),
6331 signature
->return_type
->name
);
6334 /* Function definitions do not have r-values.
6341 ast_jump_statement::hir(exec_list
*instructions
,
6342 struct _mesa_glsl_parse_state
*state
)
6349 assert(state
->current_function
);
6351 if (opt_return_value
) {
6352 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
6354 /* The value of the return type can be NULL if the shader says
6355 * 'return foo();' and foo() is a function that returns void.
6357 * NOTE: The GLSL spec doesn't say that this is an error. The type
6358 * of the return value is void. If the return type of the function is
6359 * also void, then this should compile without error. Seriously.
6361 const glsl_type
*const ret_type
=
6362 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
6364 /* Implicit conversions are not allowed for return values prior to
6365 * ARB_shading_language_420pack.
6367 if (state
->current_function
->return_type
!= ret_type
) {
6368 YYLTYPE loc
= this->get_location();
6370 if (state
->has_420pack()) {
6371 if (!apply_implicit_conversion(state
->current_function
->return_type
,
6373 || (ret
->type
!= state
->current_function
->return_type
)) {
6374 _mesa_glsl_error(& loc
, state
,
6375 "could not implicitly convert return value "
6376 "to %s, in function `%s'",
6377 state
->current_function
->return_type
->name
,
6378 state
->current_function
->function_name());
6381 _mesa_glsl_error(& loc
, state
,
6382 "`return' with wrong type %s, in function `%s' "
6385 state
->current_function
->function_name(),
6386 state
->current_function
->return_type
->name
);
6388 } else if (state
->current_function
->return_type
->base_type
==
6390 YYLTYPE loc
= this->get_location();
6392 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
6393 * specs add a clarification:
6395 * "A void function can only use return without a return argument, even if
6396 * the return argument has void type. Return statements only accept values:
6399 * void func2() { return func1(); } // illegal return statement"
6401 _mesa_glsl_error(& loc
, state
,
6402 "void functions can only use `return' without a "
6406 inst
= new(ctx
) ir_return(ret
);
6408 if (state
->current_function
->return_type
->base_type
!=
6410 YYLTYPE loc
= this->get_location();
6412 _mesa_glsl_error(& loc
, state
,
6413 "`return' with no value, in function %s returning "
6415 state
->current_function
->function_name());
6417 inst
= new(ctx
) ir_return
;
6420 state
->found_return
= true;
6421 instructions
->push_tail(inst
);
6426 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6427 YYLTYPE loc
= this->get_location();
6429 _mesa_glsl_error(& loc
, state
,
6430 "`discard' may only appear in a fragment shader");
6432 instructions
->push_tail(new(ctx
) ir_discard
);
6437 if (mode
== ast_continue
&&
6438 state
->loop_nesting_ast
== NULL
) {
6439 YYLTYPE loc
= this->get_location();
6441 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
6442 } else if (mode
== ast_break
&&
6443 state
->loop_nesting_ast
== NULL
&&
6444 state
->switch_state
.switch_nesting_ast
== NULL
) {
6445 YYLTYPE loc
= this->get_location();
6447 _mesa_glsl_error(& loc
, state
,
6448 "break may only appear in a loop or a switch");
6450 /* For a loop, inline the for loop expression again, since we don't
6451 * know where near the end of the loop body the normal copy of it is
6452 * going to be placed. Same goes for the condition for a do-while
6455 if (state
->loop_nesting_ast
!= NULL
&&
6456 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
6457 if (state
->loop_nesting_ast
->rest_expression
) {
6458 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
6461 if (state
->loop_nesting_ast
->mode
==
6462 ast_iteration_statement::ast_do_while
) {
6463 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
6467 if (state
->switch_state
.is_switch_innermost
&&
6468 mode
== ast_continue
) {
6469 /* Set 'continue_inside' to true. */
6470 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6471 ir_dereference_variable
*deref_continue_inside_var
=
6472 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6473 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6476 /* Break out from the switch, continue for the loop will
6477 * be called right after switch. */
6478 ir_loop_jump
*const jump
=
6479 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6480 instructions
->push_tail(jump
);
6482 } else if (state
->switch_state
.is_switch_innermost
&&
6483 mode
== ast_break
) {
6484 /* Force break out of switch by inserting a break. */
6485 ir_loop_jump
*const jump
=
6486 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6487 instructions
->push_tail(jump
);
6489 ir_loop_jump
*const jump
=
6490 new(ctx
) ir_loop_jump((mode
== ast_break
)
6491 ? ir_loop_jump::jump_break
6492 : ir_loop_jump::jump_continue
);
6493 instructions
->push_tail(jump
);
6500 /* Jump instructions do not have r-values.
6507 ast_demote_statement::hir(exec_list
*instructions
,
6508 struct _mesa_glsl_parse_state
*state
)
6512 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6513 YYLTYPE loc
= this->get_location();
6515 _mesa_glsl_error(& loc
, state
,
6516 "`demote' may only appear in a fragment shader");
6519 instructions
->push_tail(new(ctx
) ir_demote
);
6526 ast_selection_statement::hir(exec_list
*instructions
,
6527 struct _mesa_glsl_parse_state
*state
)
6531 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6533 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6535 * "Any expression whose type evaluates to a Boolean can be used as the
6536 * conditional expression bool-expression. Vector types are not accepted
6537 * as the expression to if."
6539 * The checks are separated so that higher quality diagnostics can be
6540 * generated for cases where both rules are violated.
6542 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6543 YYLTYPE loc
= this->condition
->get_location();
6545 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6549 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6551 if (then_statement
!= NULL
) {
6552 state
->symbols
->push_scope();
6553 then_statement
->hir(& stmt
->then_instructions
, state
);
6554 state
->symbols
->pop_scope();
6557 if (else_statement
!= NULL
) {
6558 state
->symbols
->push_scope();
6559 else_statement
->hir(& stmt
->else_instructions
, state
);
6560 state
->symbols
->pop_scope();
6563 instructions
->push_tail(stmt
);
6565 /* if-statements do not have r-values.
6572 /** Value of the case label. */
6575 /** Does this label occur after the default? */
6579 * AST for the case label.
6581 * This is only used to generate error messages for duplicate labels.
6583 ast_expression
*ast
;
6586 /* Used for detection of duplicate case values, compare
6587 * given contents directly.
6590 compare_case_value(const void *a
, const void *b
)
6592 return ((struct case_label
*) a
)->value
== ((struct case_label
*) b
)->value
;
6596 /* Used for detection of duplicate case values, just
6597 * returns key contents as is.
6600 key_contents(const void *key
)
6602 return ((struct case_label
*) key
)->value
;
6607 ast_switch_statement::hir(exec_list
*instructions
,
6608 struct _mesa_glsl_parse_state
*state
)
6612 ir_rvalue
*const test_expression
=
6613 this->test_expression
->hir(instructions
, state
);
6615 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6617 * "The type of init-expression in a switch statement must be a
6620 if (!test_expression
->type
->is_scalar() ||
6621 !test_expression
->type
->is_integer_32()) {
6622 YYLTYPE loc
= this->test_expression
->get_location();
6624 _mesa_glsl_error(& loc
,
6626 "switch-statement expression must be scalar "
6631 /* Track the switch-statement nesting in a stack-like manner.
6633 struct glsl_switch_state saved
= state
->switch_state
;
6635 state
->switch_state
.is_switch_innermost
= true;
6636 state
->switch_state
.switch_nesting_ast
= this;
6637 state
->switch_state
.labels_ht
=
6638 _mesa_hash_table_create(NULL
, key_contents
,
6639 compare_case_value
);
6640 state
->switch_state
.previous_default
= NULL
;
6642 /* Initalize is_fallthru state to false.
6644 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6645 state
->switch_state
.is_fallthru_var
=
6646 new(ctx
) ir_variable(glsl_type::bool_type
,
6647 "switch_is_fallthru_tmp",
6649 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6651 ir_dereference_variable
*deref_is_fallthru_var
=
6652 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6653 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6656 /* Initialize continue_inside state to false.
6658 state
->switch_state
.continue_inside
=
6659 new(ctx
) ir_variable(glsl_type::bool_type
,
6660 "continue_inside_tmp",
6662 instructions
->push_tail(state
->switch_state
.continue_inside
);
6664 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6665 ir_dereference_variable
*deref_continue_inside_var
=
6666 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6667 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6670 state
->switch_state
.run_default
=
6671 new(ctx
) ir_variable(glsl_type::bool_type
,
6674 instructions
->push_tail(state
->switch_state
.run_default
);
6676 /* Loop around the switch is used for flow control. */
6677 ir_loop
* loop
= new(ctx
) ir_loop();
6678 instructions
->push_tail(loop
);
6680 /* Cache test expression.
6682 test_to_hir(&loop
->body_instructions
, state
);
6684 /* Emit code for body of switch stmt.
6686 body
->hir(&loop
->body_instructions
, state
);
6688 /* Insert a break at the end to exit loop. */
6689 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6690 loop
->body_instructions
.push_tail(jump
);
6692 /* If we are inside loop, check if continue got called inside switch. */
6693 if (state
->loop_nesting_ast
!= NULL
) {
6694 ir_dereference_variable
*deref_continue_inside
=
6695 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6696 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6697 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6699 if (state
->loop_nesting_ast
!= NULL
) {
6700 if (state
->loop_nesting_ast
->rest_expression
) {
6701 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6704 if (state
->loop_nesting_ast
->mode
==
6705 ast_iteration_statement::ast_do_while
) {
6706 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6709 irif
->then_instructions
.push_tail(jump
);
6710 instructions
->push_tail(irif
);
6713 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6715 state
->switch_state
= saved
;
6717 /* Switch statements do not have r-values. */
6723 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6724 struct _mesa_glsl_parse_state
*state
)
6728 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6729 * on the switch test case. The first one would be already raised when
6730 * getting the test_expression at ast_switch_statement::hir
6732 test_expression
->set_is_lhs(true);
6733 /* Cache value of test expression. */
6734 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6736 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6739 ir_dereference_variable
*deref_test_var
=
6740 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6742 instructions
->push_tail(state
->switch_state
.test_var
);
6743 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6748 ast_switch_body::hir(exec_list
*instructions
,
6749 struct _mesa_glsl_parse_state
*state
)
6752 stmts
->hir(instructions
, state
);
6754 /* Switch bodies do not have r-values. */
6759 ast_case_statement_list::hir(exec_list
*instructions
,
6760 struct _mesa_glsl_parse_state
*state
)
6762 exec_list default_case
, after_default
, tmp
;
6764 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6765 case_stmt
->hir(&tmp
, state
);
6768 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6769 default_case
.append_list(&tmp
);
6773 /* If default case found, append 'after_default' list. */
6774 if (!default_case
.is_empty())
6775 after_default
.append_list(&tmp
);
6777 instructions
->append_list(&tmp
);
6780 /* Handle the default case. This is done here because default might not be
6781 * the last case. We need to add checks against following cases first to see
6782 * if default should be chosen or not.
6784 if (!default_case
.is_empty()) {
6785 ir_factory
body(instructions
, state
);
6787 ir_expression
*cmp
= NULL
;
6789 hash_table_foreach(state
->switch_state
.labels_ht
, entry
) {
6790 const struct case_label
*const l
= (struct case_label
*) entry
->data
;
6792 /* If the switch init-value is the value of one of the labels that
6793 * occurs after the default case, disable execution of the default
6796 if (l
->after_default
) {
6797 ir_constant
*const cnst
=
6798 state
->switch_state
.test_var
->type
->base_type
== GLSL_TYPE_UINT
6799 ? body
.constant(unsigned(l
->value
))
6800 : body
.constant(int(l
->value
));
6803 ? equal(cnst
, state
->switch_state
.test_var
)
6804 : logic_or(cmp
, equal(cnst
, state
->switch_state
.test_var
));
6809 body
.emit(assign(state
->switch_state
.run_default
, logic_not(cmp
)));
6811 body
.emit(assign(state
->switch_state
.run_default
, body
.constant(true)));
6813 /* Append default case and all cases after it. */
6814 instructions
->append_list(&default_case
);
6815 instructions
->append_list(&after_default
);
6818 /* Case statements do not have r-values. */
6823 ast_case_statement::hir(exec_list
*instructions
,
6824 struct _mesa_glsl_parse_state
*state
)
6826 labels
->hir(instructions
, state
);
6828 /* Guard case statements depending on fallthru state. */
6829 ir_dereference_variable
*const deref_fallthru_guard
=
6830 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6831 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6833 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6834 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6836 instructions
->push_tail(test_fallthru
);
6838 /* Case statements do not have r-values. */
6844 ast_case_label_list::hir(exec_list
*instructions
,
6845 struct _mesa_glsl_parse_state
*state
)
6847 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6848 label
->hir(instructions
, state
);
6850 /* Case labels do not have r-values. */
6855 ast_case_label::hir(exec_list
*instructions
,
6856 struct _mesa_glsl_parse_state
*state
)
6858 ir_factory
body(instructions
, state
);
6860 ir_variable
*const fallthru_var
= state
->switch_state
.is_fallthru_var
;
6862 /* If not default case, ... */
6863 if (this->test_value
!= NULL
) {
6864 /* Conditionally set fallthru state based on
6865 * comparison of cached test expression value to case label.
6867 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6868 ir_constant
*label_const
=
6869 label_rval
->constant_expression_value(body
.mem_ctx
);
6872 YYLTYPE loc
= this->test_value
->get_location();
6874 _mesa_glsl_error(& loc
, state
,
6875 "switch statement case label must be a "
6876 "constant expression");
6878 /* Stuff a dummy value in to allow processing to continue. */
6879 label_const
= body
.constant(0);
6882 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6883 &label_const
->value
.u
[0]);
6886 const struct case_label
*const l
=
6887 (struct case_label
*) entry
->data
;
6888 const ast_expression
*const previous_label
= l
->ast
;
6889 YYLTYPE loc
= this->test_value
->get_location();
6891 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6893 loc
= previous_label
->get_location();
6894 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6896 struct case_label
*l
= ralloc(state
->switch_state
.labels_ht
,
6899 l
->value
= label_const
->value
.u
[0];
6900 l
->after_default
= state
->switch_state
.previous_default
!= NULL
;
6901 l
->ast
= this->test_value
;
6903 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6904 &label_const
->value
.u
[0],
6909 /* Create an r-value version of the ir_constant label here (after we may
6910 * have created a fake one in error cases) that can be passed to
6911 * apply_implicit_conversion below.
6913 ir_rvalue
*label
= label_const
;
6915 ir_rvalue
*deref_test_var
=
6916 new(body
.mem_ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6919 * From GLSL 4.40 specification section 6.2 ("Selection"):
6921 * "The type of the init-expression value in a switch statement must
6922 * be a scalar int or uint. The type of the constant-expression value
6923 * in a case label also must be a scalar int or uint. When any pair
6924 * of these values is tested for "equal value" and the types do not
6925 * match, an implicit conversion will be done to convert the int to a
6926 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6929 if (label
->type
!= state
->switch_state
.test_var
->type
) {
6930 YYLTYPE loc
= this->test_value
->get_location();
6932 const glsl_type
*type_a
= label
->type
;
6933 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6935 /* Check if int->uint implicit conversion is supported. */
6936 bool integer_conversion_supported
=
6937 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6940 if ((!type_a
->is_integer_32() || !type_b
->is_integer_32()) ||
6941 !integer_conversion_supported
) {
6942 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6943 "init-expression and case label (%s != %s)",
6944 type_a
->name
, type_b
->name
);
6946 /* Conversion of the case label. */
6947 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6948 if (!apply_implicit_conversion(glsl_type::uint_type
,
6950 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6952 /* Conversion of the init-expression value. */
6953 if (!apply_implicit_conversion(glsl_type::uint_type
,
6954 deref_test_var
, state
))
6955 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6959 /* If the implicit conversion was allowed, the types will already be
6960 * the same. If the implicit conversion wasn't allowed, smash the
6961 * type of the label anyway. This will prevent the expression
6962 * constructor (below) from failing an assertion.
6964 label
->type
= deref_test_var
->type
;
6967 body
.emit(assign(fallthru_var
,
6968 logic_or(fallthru_var
, equal(label
, deref_test_var
))));
6969 } else { /* default case */
6970 if (state
->switch_state
.previous_default
) {
6971 YYLTYPE loc
= this->get_location();
6972 _mesa_glsl_error(& loc
, state
,
6973 "multiple default labels in one switch");
6975 loc
= state
->switch_state
.previous_default
->get_location();
6976 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6978 state
->switch_state
.previous_default
= this;
6980 /* Set fallthru condition on 'run_default' bool. */
6981 body
.emit(assign(fallthru_var
,
6982 logic_or(fallthru_var
,
6983 state
->switch_state
.run_default
)));
6986 /* Case statements do not have r-values. */
6991 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6992 struct _mesa_glsl_parse_state
*state
)
6996 if (condition
!= NULL
) {
6997 ir_rvalue
*const cond
=
6998 condition
->hir(instructions
, state
);
7001 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
7002 YYLTYPE loc
= condition
->get_location();
7004 _mesa_glsl_error(& loc
, state
,
7005 "loop condition must be scalar boolean");
7007 /* As the first code in the loop body, generate a block that looks
7008 * like 'if (!condition) break;' as the loop termination condition.
7010 ir_rvalue
*const not_cond
=
7011 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
7013 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
7015 ir_jump
*const break_stmt
=
7016 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
7018 if_stmt
->then_instructions
.push_tail(break_stmt
);
7019 instructions
->push_tail(if_stmt
);
7026 ast_iteration_statement::hir(exec_list
*instructions
,
7027 struct _mesa_glsl_parse_state
*state
)
7031 /* For-loops and while-loops start a new scope, but do-while loops do not.
7033 if (mode
!= ast_do_while
)
7034 state
->symbols
->push_scope();
7036 if (init_statement
!= NULL
)
7037 init_statement
->hir(instructions
, state
);
7039 ir_loop
*const stmt
= new(ctx
) ir_loop();
7040 instructions
->push_tail(stmt
);
7042 /* Track the current loop nesting. */
7043 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
7045 state
->loop_nesting_ast
= this;
7047 /* Likewise, indicate that following code is closest to a loop,
7048 * NOT closest to a switch.
7050 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
7051 state
->switch_state
.is_switch_innermost
= false;
7053 if (mode
!= ast_do_while
)
7054 condition_to_hir(&stmt
->body_instructions
, state
);
7057 body
->hir(& stmt
->body_instructions
, state
);
7059 if (rest_expression
!= NULL
)
7060 rest_expression
->hir(& stmt
->body_instructions
, state
);
7062 if (mode
== ast_do_while
)
7063 condition_to_hir(&stmt
->body_instructions
, state
);
7065 if (mode
!= ast_do_while
)
7066 state
->symbols
->pop_scope();
7068 /* Restore previous nesting before returning. */
7069 state
->loop_nesting_ast
= nesting_ast
;
7070 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
7072 /* Loops do not have r-values.
7079 * Determine if the given type is valid for establishing a default precision
7082 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
7084 * "The precision statement
7086 * precision precision-qualifier type;
7088 * can be used to establish a default precision qualifier. The type field
7089 * can be either int or float or any of the sampler types, and the
7090 * precision-qualifier can be lowp, mediump, or highp."
7092 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
7093 * qualifiers on sampler types, but this seems like an oversight (since the
7094 * intention of including these in GLSL 1.30 is to allow compatibility with ES
7095 * shaders). So we allow int, float, and all sampler types regardless of GLSL
7099 is_valid_default_precision_type(const struct glsl_type
*const type
)
7104 switch (type
->base_type
) {
7106 case GLSL_TYPE_FLOAT
:
7107 /* "int" and "float" are valid, but vectors and matrices are not. */
7108 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
7109 case GLSL_TYPE_SAMPLER
:
7110 case GLSL_TYPE_IMAGE
:
7111 case GLSL_TYPE_ATOMIC_UINT
:
7120 ast_type_specifier::hir(exec_list
*instructions
,
7121 struct _mesa_glsl_parse_state
*state
)
7123 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
7126 YYLTYPE loc
= this->get_location();
7128 /* If this is a precision statement, check that the type to which it is
7129 * applied is either float or int.
7131 * From section 4.5.3 of the GLSL 1.30 spec:
7132 * "The precision statement
7133 * precision precision-qualifier type;
7134 * can be used to establish a default precision qualifier. The type
7135 * field can be either int or float [...]. Any other types or
7136 * qualifiers will result in an error.
7138 if (this->default_precision
!= ast_precision_none
) {
7139 if (!state
->check_precision_qualifiers_allowed(&loc
))
7142 if (this->structure
!= NULL
) {
7143 _mesa_glsl_error(&loc
, state
,
7144 "precision qualifiers do not apply to structures");
7148 if (this->array_specifier
!= NULL
) {
7149 _mesa_glsl_error(&loc
, state
,
7150 "default precision statements do not apply to "
7155 const struct glsl_type
*const type
=
7156 state
->symbols
->get_type(this->type_name
);
7157 if (!is_valid_default_precision_type(type
)) {
7158 _mesa_glsl_error(&loc
, state
,
7159 "default precision statements apply only to "
7160 "float, int, and opaque types");
7164 if (state
->es_shader
) {
7165 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
7168 * "Non-precision qualified declarations will use the precision
7169 * qualifier specified in the most recent precision statement
7170 * that is still in scope. The precision statement has the same
7171 * scoping rules as variable declarations. If it is declared
7172 * inside a compound statement, its effect stops at the end of
7173 * the innermost statement it was declared in. Precision
7174 * statements in nested scopes override precision statements in
7175 * outer scopes. Multiple precision statements for the same basic
7176 * type can appear inside the same scope, with later statements
7177 * overriding earlier statements within that scope."
7179 * Default precision specifications follow the same scope rules as
7180 * variables. So, we can track the state of the default precision
7181 * qualifiers in the symbol table, and the rules will just work. This
7182 * is a slight abuse of the symbol table, but it has the semantics
7185 state
->symbols
->add_default_precision_qualifier(this->type_name
,
7186 this->default_precision
);
7189 /* FINISHME: Translate precision statements into IR. */
7193 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
7194 * process_record_constructor() can do type-checking on C-style initializer
7195 * expressions of structs, but ast_struct_specifier should only be translated
7196 * to HIR if it is declaring the type of a structure.
7198 * The ->is_declaration field is false for initializers of variables
7199 * declared separately from the struct's type definition.
7201 * struct S { ... }; (is_declaration = true)
7202 * struct T { ... } t = { ... }; (is_declaration = true)
7203 * S s = { ... }; (is_declaration = false)
7205 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
7206 return this->structure
->hir(instructions
, state
);
7213 * Process a structure or interface block tree into an array of structure fields
7215 * After parsing, where there are some syntax differnces, structures and
7216 * interface blocks are almost identical. They are similar enough that the
7217 * AST for each can be processed the same way into a set of
7218 * \c glsl_struct_field to describe the members.
7220 * If we're processing an interface block, var_mode should be the type of the
7221 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
7222 * ir_var_shader_storage). If we're processing a structure, var_mode should be
7226 * The number of fields processed. A pointer to the array structure fields is
7227 * stored in \c *fields_ret.
7230 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
7231 struct _mesa_glsl_parse_state
*state
,
7232 exec_list
*declarations
,
7233 glsl_struct_field
**fields_ret
,
7235 enum glsl_matrix_layout matrix_layout
,
7236 bool allow_reserved_names
,
7237 ir_variable_mode var_mode
,
7238 ast_type_qualifier
*layout
,
7239 unsigned block_stream
,
7240 unsigned block_xfb_buffer
,
7241 unsigned block_xfb_offset
,
7242 unsigned expl_location
,
7243 unsigned expl_align
)
7245 unsigned decl_count
= 0;
7246 unsigned next_offset
= 0;
7248 /* Make an initial pass over the list of fields to determine how
7249 * many there are. Each element in this list is an ast_declarator_list.
7250 * This means that we actually need to count the number of elements in the
7251 * 'declarations' list in each of the elements.
7253 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7254 decl_count
+= decl_list
->declarations
.length();
7257 /* Allocate storage for the fields and process the field
7258 * declarations. As the declarations are processed, try to also convert
7259 * the types to HIR. This ensures that structure definitions embedded in
7260 * other structure definitions or in interface blocks are processed.
7262 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
7265 bool first_member
= true;
7266 bool first_member_has_explicit_location
= false;
7269 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7270 const char *type_name
;
7271 YYLTYPE loc
= decl_list
->get_location();
7273 decl_list
->type
->specifier
->hir(instructions
, state
);
7275 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
7277 * "Anonymous structures are not supported; so embedded structures
7278 * must have a declarator. A name given to an embedded struct is
7279 * scoped at the same level as the struct it is embedded in."
7281 * The same section of the GLSL 1.20 spec says:
7283 * "Anonymous structures are not supported. Embedded structures are
7286 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
7287 * embedded structures in 1.10 only.
7289 if (state
->language_version
!= 110 &&
7290 decl_list
->type
->specifier
->structure
!= NULL
)
7291 _mesa_glsl_error(&loc
, state
,
7292 "embedded structure declarations are not allowed");
7294 const glsl_type
*decl_type
=
7295 decl_list
->type
->glsl_type(& type_name
, state
);
7297 const struct ast_type_qualifier
*const qual
=
7298 &decl_list
->type
->qualifier
;
7300 /* From section 4.3.9 of the GLSL 4.40 spec:
7302 * "[In interface blocks] opaque types are not allowed."
7304 * It should be impossible for decl_type to be NULL here. Cases that
7305 * might naturally lead to decl_type being NULL, especially for the
7306 * is_interface case, will have resulted in compilation having
7307 * already halted due to a syntax error.
7312 /* From section 4.3.7 of the ARB_bindless_texture spec:
7314 * "(remove the following bullet from the last list on p. 39,
7315 * thereby permitting sampler types in interface blocks; image
7316 * types are also permitted in blocks by this extension)"
7318 * * sampler types are not allowed
7320 if (decl_type
->contains_atomic() ||
7321 (!state
->has_bindless() && decl_type
->contains_opaque())) {
7322 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
7323 "interface block contains %s variable",
7324 state
->has_bindless() ? "atomic" : "opaque");
7327 if (decl_type
->contains_atomic()) {
7328 /* From section 4.1.7.3 of the GLSL 4.40 spec:
7330 * "Members of structures cannot be declared as atomic counter
7333 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
7336 if (!state
->has_bindless() && decl_type
->contains_image()) {
7337 /* FINISHME: Same problem as with atomic counters.
7338 * FINISHME: Request clarification from Khronos and add
7339 * FINISHME: spec quotation here.
7341 _mesa_glsl_error(&loc
, state
, "image in structure");
7345 if (qual
->flags
.q
.explicit_binding
) {
7346 _mesa_glsl_error(&loc
, state
,
7347 "binding layout qualifier cannot be applied "
7348 "to struct or interface block members");
7352 if (!first_member
) {
7353 if (!layout
->flags
.q
.explicit_location
&&
7354 ((first_member_has_explicit_location
&&
7355 !qual
->flags
.q
.explicit_location
) ||
7356 (!first_member_has_explicit_location
&&
7357 qual
->flags
.q
.explicit_location
))) {
7358 _mesa_glsl_error(&loc
, state
,
7359 "when block-level location layout qualifier "
7360 "is not supplied either all members must "
7361 "have a location layout qualifier or all "
7362 "members must not have a location layout "
7366 first_member
= false;
7367 first_member_has_explicit_location
=
7368 qual
->flags
.q
.explicit_location
;
7372 if (qual
->flags
.q
.std140
||
7373 qual
->flags
.q
.std430
||
7374 qual
->flags
.q
.packed
||
7375 qual
->flags
.q
.shared
) {
7376 _mesa_glsl_error(&loc
, state
,
7377 "uniform/shader storage block layout qualifiers "
7378 "std140, std430, packed, and shared can only be "
7379 "applied to uniform/shader storage blocks, not "
7383 if (qual
->flags
.q
.constant
) {
7384 _mesa_glsl_error(&loc
, state
,
7385 "const storage qualifier cannot be applied "
7386 "to struct or interface block members");
7389 validate_memory_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7390 validate_image_format_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7392 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
7394 * "A block member may be declared with a stream identifier, but
7395 * the specified stream must match the stream associated with the
7396 * containing block."
7398 if (qual
->flags
.q
.explicit_stream
) {
7399 unsigned qual_stream
;
7400 if (process_qualifier_constant(state
, &loc
, "stream",
7401 qual
->stream
, &qual_stream
) &&
7402 qual_stream
!= block_stream
) {
7403 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
7404 "interface block member does not match "
7405 "the interface block (%u vs %u)", qual_stream
,
7411 unsigned explicit_xfb_buffer
= 0;
7412 if (qual
->flags
.q
.explicit_xfb_buffer
) {
7413 unsigned qual_xfb_buffer
;
7414 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
7415 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
7416 explicit_xfb_buffer
= 1;
7417 if (qual_xfb_buffer
!= block_xfb_buffer
)
7418 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
7419 "interface block member does not match "
7420 "the interface block (%u vs %u)",
7421 qual_xfb_buffer
, block_xfb_buffer
);
7423 xfb_buffer
= (int) qual_xfb_buffer
;
7426 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
7427 xfb_buffer
= (int) block_xfb_buffer
;
7430 int xfb_stride
= -1;
7431 if (qual
->flags
.q
.explicit_xfb_stride
) {
7432 unsigned qual_xfb_stride
;
7433 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
7434 qual
->xfb_stride
, &qual_xfb_stride
)) {
7435 xfb_stride
= (int) qual_xfb_stride
;
7439 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
7440 _mesa_glsl_error(&loc
, state
,
7441 "interpolation qualifiers cannot be used "
7442 "with uniform interface blocks");
7445 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
7446 qual
->has_auxiliary_storage()) {
7447 _mesa_glsl_error(&loc
, state
,
7448 "auxiliary storage qualifiers cannot be used "
7449 "in uniform blocks or structures.");
7452 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
7453 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
7454 _mesa_glsl_error(&loc
, state
,
7455 "row_major and column_major can only be "
7456 "applied to interface blocks");
7458 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
7461 foreach_list_typed (ast_declaration
, decl
, link
,
7462 &decl_list
->declarations
) {
7463 YYLTYPE loc
= decl
->get_location();
7465 if (!allow_reserved_names
)
7466 validate_identifier(decl
->identifier
, loc
, state
);
7468 const struct glsl_type
*field_type
=
7469 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
7470 validate_array_dimensions(field_type
, state
, &loc
);
7471 fields
[i
].type
= field_type
;
7472 fields
[i
].name
= decl
->identifier
;
7473 fields
[i
].interpolation
=
7474 interpret_interpolation_qualifier(qual
, field_type
,
7475 var_mode
, state
, &loc
);
7476 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
7477 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
7478 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
7479 fields
[i
].offset
= -1;
7480 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
7481 fields
[i
].xfb_buffer
= xfb_buffer
;
7482 fields
[i
].xfb_stride
= xfb_stride
;
7484 if (qual
->flags
.q
.explicit_location
) {
7485 unsigned qual_location
;
7486 if (process_qualifier_constant(state
, &loc
, "location",
7487 qual
->location
, &qual_location
)) {
7488 fields
[i
].location
= qual_location
+
7489 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
7490 expl_location
= fields
[i
].location
+
7491 fields
[i
].type
->count_attribute_slots(false);
7494 if (layout
&& layout
->flags
.q
.explicit_location
) {
7495 fields
[i
].location
= expl_location
;
7496 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
7498 fields
[i
].location
= -1;
7502 /* Offset can only be used with std430 and std140 layouts an initial
7503 * value of 0 is used for error detection.
7509 if (qual
->flags
.q
.row_major
||
7510 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7516 if(layout
->flags
.q
.std140
) {
7517 align
= field_type
->std140_base_alignment(row_major
);
7518 size
= field_type
->std140_size(row_major
);
7519 } else if (layout
->flags
.q
.std430
) {
7520 align
= field_type
->std430_base_alignment(row_major
);
7521 size
= field_type
->std430_size(row_major
);
7525 if (qual
->flags
.q
.explicit_offset
) {
7526 unsigned qual_offset
;
7527 if (process_qualifier_constant(state
, &loc
, "offset",
7528 qual
->offset
, &qual_offset
)) {
7529 if (align
!= 0 && size
!= 0) {
7530 if (next_offset
> qual_offset
)
7531 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7532 "offset overlaps previous member");
7534 if (qual_offset
% align
) {
7535 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7536 "must be a multiple of the base "
7537 "alignment of %s", field_type
->name
);
7539 fields
[i
].offset
= qual_offset
;
7540 next_offset
= qual_offset
+ size
;
7542 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7543 "with std430 and std140 layouts");
7548 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7549 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7551 if (align
== 0 || size
== 0) {
7552 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7553 "std430 and std140 layouts");
7554 } else if (qual
->flags
.q
.explicit_align
) {
7555 unsigned member_align
;
7556 if (process_qualifier_constant(state
, &loc
, "align",
7557 qual
->align
, &member_align
)) {
7558 if (member_align
== 0 ||
7559 member_align
& (member_align
- 1)) {
7560 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7561 "is not a power of 2");
7563 fields
[i
].offset
= glsl_align(offset
, member_align
);
7564 next_offset
= fields
[i
].offset
+ size
;
7568 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7569 next_offset
= fields
[i
].offset
+ size
;
7571 } else if (!qual
->flags
.q
.explicit_offset
) {
7572 if (align
!= 0 && size
!= 0)
7573 next_offset
= glsl_align(next_offset
, align
) + size
;
7576 /* From the ARB_enhanced_layouts spec:
7578 * "The given offset applies to the first component of the first
7579 * member of the qualified entity. Then, within the qualified
7580 * entity, subsequent components are each assigned, in order, to
7581 * the next available offset aligned to a multiple of that
7582 * component's size. Aggregate types are flattened down to the
7583 * component level to get this sequence of components."
7585 if (qual
->flags
.q
.explicit_xfb_offset
) {
7586 unsigned xfb_offset
;
7587 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7588 qual
->offset
, &xfb_offset
)) {
7589 fields
[i
].offset
= xfb_offset
;
7590 block_xfb_offset
= fields
[i
].offset
+
7591 4 * field_type
->component_slots();
7594 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7595 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7596 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7597 block_xfb_offset
+= 4 * field_type
->component_slots();
7601 /* Propogate row- / column-major information down the fields of the
7602 * structure or interface block. Structures need this data because
7603 * the structure may contain a structure that contains ... a matrix
7604 * that need the proper layout.
7606 if (is_interface
&& layout
&&
7607 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7608 (field_type
->without_array()->is_matrix()
7609 || field_type
->without_array()->is_struct())) {
7610 /* If no layout is specified for the field, inherit the layout
7613 fields
[i
].matrix_layout
= matrix_layout
;
7615 if (qual
->flags
.q
.row_major
)
7616 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7617 else if (qual
->flags
.q
.column_major
)
7618 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7620 /* If we're processing an uniform or buffer block, the matrix
7621 * layout must be decided by this point.
7623 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7624 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7627 /* Memory qualifiers are allowed on buffer and image variables, while
7628 * the format qualifier is only accepted for images.
7630 if (var_mode
== ir_var_shader_storage
||
7631 field_type
->without_array()->is_image()) {
7632 /* For readonly and writeonly qualifiers the field definition,
7633 * if set, overwrites the layout qualifier.
7635 if (qual
->flags
.q
.read_only
|| qual
->flags
.q
.write_only
) {
7636 fields
[i
].memory_read_only
= qual
->flags
.q
.read_only
;
7637 fields
[i
].memory_write_only
= qual
->flags
.q
.write_only
;
7639 fields
[i
].memory_read_only
=
7640 layout
? layout
->flags
.q
.read_only
: 0;
7641 fields
[i
].memory_write_only
=
7642 layout
? layout
->flags
.q
.write_only
: 0;
7645 /* For other qualifiers, we set the flag if either the layout
7646 * qualifier or the field qualifier are set
7648 fields
[i
].memory_coherent
= qual
->flags
.q
.coherent
||
7649 (layout
&& layout
->flags
.q
.coherent
);
7650 fields
[i
].memory_volatile
= qual
->flags
.q
._volatile
||
7651 (layout
&& layout
->flags
.q
._volatile
);
7652 fields
[i
].memory_restrict
= qual
->flags
.q
.restrict_flag
||
7653 (layout
&& layout
->flags
.q
.restrict_flag
);
7655 if (field_type
->without_array()->is_image()) {
7656 if (qual
->flags
.q
.explicit_image_format
) {
7657 if (qual
->image_base_type
!=
7658 field_type
->without_array()->sampled_type
) {
7659 _mesa_glsl_error(&loc
, state
, "format qualifier doesn't "
7660 "match the base data type of the image");
7663 fields
[i
].image_format
= qual
->image_format
;
7665 if (!qual
->flags
.q
.write_only
) {
7666 _mesa_glsl_error(&loc
, state
, "image not qualified with "
7667 "`writeonly' must have a format layout "
7671 fields
[i
].image_format
= PIPE_FORMAT_NONE
;
7676 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
7677 if (state
->es_shader
) {
7678 fields
[i
].precision
= select_gles_precision(qual
->precision
,
7683 fields
[i
].precision
= qual
->precision
;
7690 assert(i
== decl_count
);
7692 *fields_ret
= fields
;
7698 ast_struct_specifier::hir(exec_list
*instructions
,
7699 struct _mesa_glsl_parse_state
*state
)
7701 YYLTYPE loc
= this->get_location();
7703 unsigned expl_location
= 0;
7704 if (layout
&& layout
->flags
.q
.explicit_location
) {
7705 if (!process_qualifier_constant(state
, &loc
, "location",
7706 layout
->location
, &expl_location
)) {
7709 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7713 glsl_struct_field
*fields
;
7714 unsigned decl_count
=
7715 ast_process_struct_or_iface_block_members(instructions
,
7717 &this->declarations
,
7720 GLSL_MATRIX_LAYOUT_INHERITED
,
7721 false /* allow_reserved_names */,
7724 0, /* for interface only */
7725 0, /* for interface only */
7726 0, /* for interface only */
7728 0 /* for interface only */);
7730 validate_identifier(this->name
, loc
, state
);
7732 type
= glsl_type::get_struct_instance(fields
, decl_count
, this->name
);
7734 if (!type
->is_anonymous() && !state
->symbols
->add_type(name
, type
)) {
7735 const glsl_type
*match
= state
->symbols
->get_type(name
);
7736 /* allow struct matching for desktop GL - older UE4 does this */
7737 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(type
, true, false))
7738 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7740 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7742 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7744 state
->num_user_structures
+ 1);
7746 s
[state
->num_user_structures
] = type
;
7747 state
->user_structures
= s
;
7748 state
->num_user_structures
++;
7752 /* Structure type definitions do not have r-values.
7759 * Visitor class which detects whether a given interface block has been used.
7761 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7764 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7765 : mode(mode
), block(block
), found(false)
7769 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7771 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7775 return visit_continue
;
7778 bool usage_found() const
7784 ir_variable_mode mode
;
7785 const glsl_type
*block
;
7790 is_unsized_array_last_element(ir_variable
*v
)
7792 const glsl_type
*interface_type
= v
->get_interface_type();
7793 int length
= interface_type
->length
;
7795 assert(v
->type
->is_unsized_array());
7797 /* Check if it is the last element of the interface */
7798 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7804 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7806 var
->data
.memory_read_only
= field
.memory_read_only
;
7807 var
->data
.memory_write_only
= field
.memory_write_only
;
7808 var
->data
.memory_coherent
= field
.memory_coherent
;
7809 var
->data
.memory_volatile
= field
.memory_volatile
;
7810 var
->data
.memory_restrict
= field
.memory_restrict
;
7814 ast_interface_block::hir(exec_list
*instructions
,
7815 struct _mesa_glsl_parse_state
*state
)
7817 YYLTYPE loc
= this->get_location();
7819 /* Interface blocks must be declared at global scope */
7820 if (state
->current_function
!= NULL
) {
7821 _mesa_glsl_error(&loc
, state
,
7822 "Interface block `%s' must be declared "
7827 /* Validate qualifiers:
7829 * - Layout Qualifiers as per the table in Section 4.4
7830 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7832 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7835 * "Additionally, memory qualifiers may also be used in the declaration
7836 * of shader storage blocks"
7838 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7839 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7840 * Layout Qualifiers) of the GLSL 4.50 spec says:
7842 * "The std430 qualifier is supported only for shader storage blocks;
7843 * using std430 on a uniform block will result in a compile-time error."
7845 ast_type_qualifier allowed_blk_qualifiers
;
7846 allowed_blk_qualifiers
.flags
.i
= 0;
7847 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7848 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7849 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7850 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7851 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7852 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7853 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7854 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7855 if (this->layout
.flags
.q
.buffer
) {
7856 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7857 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7858 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7859 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7860 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7861 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7862 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7864 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7867 /* Interface block */
7868 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7870 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7871 if (this->layout
.flags
.q
.out
) {
7872 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7873 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7874 state
->stage
== MESA_SHADER_TESS_CTRL
||
7875 state
->stage
== MESA_SHADER_TESS_EVAL
||
7876 state
->stage
== MESA_SHADER_VERTEX
) {
7877 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7878 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7879 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7880 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7881 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7882 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7883 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7884 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7886 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7887 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7891 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7892 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7893 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7898 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7899 "invalid qualifier for block",
7902 enum glsl_interface_packing packing
;
7903 if (this->layout
.flags
.q
.std140
) {
7904 packing
= GLSL_INTERFACE_PACKING_STD140
;
7905 } else if (this->layout
.flags
.q
.packed
) {
7906 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7907 } else if (this->layout
.flags
.q
.std430
) {
7908 packing
= GLSL_INTERFACE_PACKING_STD430
;
7910 /* The default layout is shared.
7912 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7915 ir_variable_mode var_mode
;
7916 const char *iface_type_name
;
7917 if (this->layout
.flags
.q
.in
) {
7918 var_mode
= ir_var_shader_in
;
7919 iface_type_name
= "in";
7920 } else if (this->layout
.flags
.q
.out
) {
7921 var_mode
= ir_var_shader_out
;
7922 iface_type_name
= "out";
7923 } else if (this->layout
.flags
.q
.uniform
) {
7924 var_mode
= ir_var_uniform
;
7925 iface_type_name
= "uniform";
7926 } else if (this->layout
.flags
.q
.buffer
) {
7927 var_mode
= ir_var_shader_storage
;
7928 iface_type_name
= "buffer";
7930 var_mode
= ir_var_auto
;
7931 iface_type_name
= "UNKNOWN";
7932 assert(!"interface block layout qualifier not found!");
7935 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7936 if (this->layout
.flags
.q
.row_major
)
7937 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7938 else if (this->layout
.flags
.q
.column_major
)
7939 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7941 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7942 exec_list declared_variables
;
7943 glsl_struct_field
*fields
;
7945 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7946 * that we don't have incompatible qualifiers
7948 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7949 _mesa_glsl_error(&loc
, state
,
7950 "Interface block sets both readonly and writeonly");
7953 unsigned qual_stream
;
7954 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7956 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7957 /* If the stream qualifier is invalid it doesn't make sense to continue
7958 * on and try to compare stream layouts on member variables against it
7959 * so just return early.
7964 unsigned qual_xfb_buffer
;
7965 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7966 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7967 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7971 unsigned qual_xfb_offset
;
7972 if (layout
.flags
.q
.explicit_xfb_offset
) {
7973 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7974 layout
.offset
, &qual_xfb_offset
)) {
7979 unsigned qual_xfb_stride
;
7980 if (layout
.flags
.q
.explicit_xfb_stride
) {
7981 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7982 layout
.xfb_stride
, &qual_xfb_stride
)) {
7987 unsigned expl_location
= 0;
7988 if (layout
.flags
.q
.explicit_location
) {
7989 if (!process_qualifier_constant(state
, &loc
, "location",
7990 layout
.location
, &expl_location
)) {
7993 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7994 : VARYING_SLOT_VAR0
;
7998 unsigned expl_align
= 0;
7999 if (layout
.flags
.q
.explicit_align
) {
8000 if (!process_qualifier_constant(state
, &loc
, "align",
8001 layout
.align
, &expl_align
)) {
8004 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
8005 _mesa_glsl_error(&loc
, state
, "align layout qualifier is not a "
8012 unsigned int num_variables
=
8013 ast_process_struct_or_iface_block_members(&declared_variables
,
8015 &this->declarations
,
8019 redeclaring_per_vertex
,
8028 if (!redeclaring_per_vertex
) {
8029 validate_identifier(this->block_name
, loc
, state
);
8031 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
8033 * "Block names have no other use within a shader beyond interface
8034 * matching; it is a compile-time error to use a block name at global
8035 * scope for anything other than as a block name."
8037 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
8038 if (var
&& !var
->type
->is_interface()) {
8039 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
8040 "already used in the scope.",
8045 const glsl_type
*earlier_per_vertex
= NULL
;
8046 if (redeclaring_per_vertex
) {
8047 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
8048 * the named interface block gl_in, we can find it by looking at the
8049 * previous declaration of gl_in. Otherwise we can find it by looking
8050 * at the previous decalartion of any of the built-in outputs,
8053 * Also check that the instance name and array-ness of the redeclaration
8057 case ir_var_shader_in
:
8058 if (ir_variable
*earlier_gl_in
=
8059 state
->symbols
->get_variable("gl_in")) {
8060 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
8062 _mesa_glsl_error(&loc
, state
,
8063 "redeclaration of gl_PerVertex input not allowed "
8065 _mesa_shader_stage_to_string(state
->stage
));
8067 if (this->instance_name
== NULL
||
8068 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
8069 !this->array_specifier
->is_single_dimension()) {
8070 _mesa_glsl_error(&loc
, state
,
8071 "gl_PerVertex input must be redeclared as "
8075 case ir_var_shader_out
:
8076 if (ir_variable
*earlier_gl_Position
=
8077 state
->symbols
->get_variable("gl_Position")) {
8078 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
8079 } else if (ir_variable
*earlier_gl_out
=
8080 state
->symbols
->get_variable("gl_out")) {
8081 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
8083 _mesa_glsl_error(&loc
, state
,
8084 "redeclaration of gl_PerVertex output not "
8085 "allowed in the %s shader",
8086 _mesa_shader_stage_to_string(state
->stage
));
8088 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
8089 if (this->instance_name
== NULL
||
8090 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
8091 _mesa_glsl_error(&loc
, state
,
8092 "gl_PerVertex output must be redeclared as "
8096 if (this->instance_name
!= NULL
) {
8097 _mesa_glsl_error(&loc
, state
,
8098 "gl_PerVertex output may not be redeclared with "
8099 "an instance name");
8104 _mesa_glsl_error(&loc
, state
,
8105 "gl_PerVertex must be declared as an input or an "
8110 if (earlier_per_vertex
== NULL
) {
8111 /* An error has already been reported. Bail out to avoid null
8112 * dereferences later in this function.
8117 /* Copy locations from the old gl_PerVertex interface block. */
8118 for (unsigned i
= 0; i
< num_variables
; i
++) {
8119 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
8121 _mesa_glsl_error(&loc
, state
,
8122 "redeclaration of gl_PerVertex must be a subset "
8123 "of the built-in members of gl_PerVertex");
8125 fields
[i
].location
=
8126 earlier_per_vertex
->fields
.structure
[j
].location
;
8128 earlier_per_vertex
->fields
.structure
[j
].offset
;
8129 fields
[i
].interpolation
=
8130 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
8131 fields
[i
].centroid
=
8132 earlier_per_vertex
->fields
.structure
[j
].centroid
;
8134 earlier_per_vertex
->fields
.structure
[j
].sample
;
8136 earlier_per_vertex
->fields
.structure
[j
].patch
;
8137 fields
[i
].precision
=
8138 earlier_per_vertex
->fields
.structure
[j
].precision
;
8139 fields
[i
].explicit_xfb_buffer
=
8140 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
8141 fields
[i
].xfb_buffer
=
8142 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
8143 fields
[i
].xfb_stride
=
8144 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
8148 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
8151 * If a built-in interface block is redeclared, it must appear in
8152 * the shader before any use of any member included in the built-in
8153 * declaration, or a compilation error will result.
8155 * This appears to be a clarification to the behaviour established for
8156 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
8157 * regardless of GLSL version.
8159 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
8160 v
.run(instructions
);
8161 if (v
.usage_found()) {
8162 _mesa_glsl_error(&loc
, state
,
8163 "redeclaration of a built-in interface block must "
8164 "appear before any use of any member of the "
8169 const glsl_type
*block_type
=
8170 glsl_type::get_interface_instance(fields
,
8174 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
8177 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
8179 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
8180 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
8183 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
8184 YYLTYPE loc
= this->get_location();
8185 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
8186 "already taken in the current scope",
8187 this->block_name
, iface_type_name
);
8190 /* Since interface blocks cannot contain statements, it should be
8191 * impossible for the block to generate any instructions.
8193 assert(declared_variables
.is_empty());
8195 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
8197 * Geometry shader input variables get the per-vertex values written
8198 * out by vertex shader output variables of the same names. Since a
8199 * geometry shader operates on a set of vertices, each input varying
8200 * variable (or input block, see interface blocks below) needs to be
8201 * declared as an array.
8203 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
8204 var_mode
== ir_var_shader_in
) {
8205 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
8206 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8207 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
8208 !this->layout
.flags
.q
.patch
&&
8209 this->array_specifier
== NULL
&&
8210 var_mode
== ir_var_shader_in
) {
8211 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
8212 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
8213 !this->layout
.flags
.q
.patch
&&
8214 this->array_specifier
== NULL
&&
8215 var_mode
== ir_var_shader_out
) {
8216 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
8220 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
8223 * "If an instance name (instance-name) is used, then it puts all the
8224 * members inside a scope within its own name space, accessed with the
8225 * field selector ( . ) operator (analogously to structures)."
8227 if (this->instance_name
) {
8228 if (redeclaring_per_vertex
) {
8229 /* When a built-in in an unnamed interface block is redeclared,
8230 * get_variable_being_redeclared() calls
8231 * check_builtin_array_max_size() to make sure that built-in array
8232 * variables aren't redeclared to illegal sizes. But we're looking
8233 * at a redeclaration of a named built-in interface block. So we
8234 * have to manually call check_builtin_array_max_size() for all parts
8235 * of the interface that are arrays.
8237 for (unsigned i
= 0; i
< num_variables
; i
++) {
8238 if (fields
[i
].type
->is_array()) {
8239 const unsigned size
= fields
[i
].type
->array_size();
8240 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
8244 validate_identifier(this->instance_name
, loc
, state
);
8249 if (this->array_specifier
!= NULL
) {
8250 const glsl_type
*block_array_type
=
8251 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
8253 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
8255 * For uniform blocks declared an array, each individual array
8256 * element corresponds to a separate buffer object backing one
8257 * instance of the block. As the array size indicates the number
8258 * of buffer objects needed, uniform block array declarations
8259 * must specify an array size.
8261 * And a few paragraphs later:
8263 * Geometry shader input blocks must be declared as arrays and
8264 * follow the array declaration and linking rules for all
8265 * geometry shader inputs. All other input and output block
8266 * arrays must specify an array size.
8268 * The same applies to tessellation shaders.
8270 * The upshot of this is that the only circumstance where an
8271 * interface array size *doesn't* need to be specified is on a
8272 * geometry shader input, tessellation control shader input,
8273 * tessellation control shader output, and tessellation evaluation
8276 if (block_array_type
->is_unsized_array()) {
8277 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
8278 state
->stage
== MESA_SHADER_TESS_CTRL
||
8279 state
->stage
== MESA_SHADER_TESS_EVAL
;
8280 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
8282 if (this->layout
.flags
.q
.in
) {
8284 _mesa_glsl_error(&loc
, state
,
8285 "unsized input block arrays not allowed in "
8287 _mesa_shader_stage_to_string(state
->stage
));
8288 } else if (this->layout
.flags
.q
.out
) {
8290 _mesa_glsl_error(&loc
, state
,
8291 "unsized output block arrays not allowed in "
8293 _mesa_shader_stage_to_string(state
->stage
));
8295 /* by elimination, this is a uniform block array */
8296 _mesa_glsl_error(&loc
, state
,
8297 "unsized uniform block arrays not allowed in "
8299 _mesa_shader_stage_to_string(state
->stage
));
8303 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
8305 * * Arrays of arrays of blocks are not allowed
8307 if (state
->es_shader
&& block_array_type
->is_array() &&
8308 block_array_type
->fields
.array
->is_array()) {
8309 _mesa_glsl_error(&loc
, state
,
8310 "arrays of arrays interface blocks are "
8314 var
= new(state
) ir_variable(block_array_type
,
8315 this->instance_name
,
8318 var
= new(state
) ir_variable(block_type
,
8319 this->instance_name
,
8323 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8324 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8326 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8327 var
->data
.read_only
= true;
8329 var
->data
.patch
= this->layout
.flags
.q
.patch
;
8331 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
8332 handle_geometry_shader_input_decl(state
, loc
, var
);
8333 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8334 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
8335 handle_tess_shader_input_decl(state
, loc
, var
);
8336 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
8337 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
8339 for (unsigned i
= 0; i
< num_variables
; i
++) {
8340 if (var
->data
.mode
== ir_var_shader_storage
)
8341 apply_memory_qualifiers(var
, fields
[i
]);
8344 if (ir_variable
*earlier
=
8345 state
->symbols
->get_variable(this->instance_name
)) {
8346 if (!redeclaring_per_vertex
) {
8347 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
8348 this->instance_name
);
8350 earlier
->data
.how_declared
= ir_var_declared_normally
;
8351 earlier
->type
= var
->type
;
8352 earlier
->reinit_interface_type(block_type
);
8355 if (this->layout
.flags
.q
.explicit_binding
) {
8356 apply_explicit_binding(state
, &loc
, var
, var
->type
,
8360 var
->data
.stream
= qual_stream
;
8361 if (layout
.flags
.q
.explicit_location
) {
8362 var
->data
.location
= expl_location
;
8363 var
->data
.explicit_location
= true;
8366 state
->symbols
->add_variable(var
);
8367 instructions
->push_tail(var
);
8370 /* In order to have an array size, the block must also be declared with
8373 assert(this->array_specifier
== NULL
);
8375 for (unsigned i
= 0; i
< num_variables
; i
++) {
8377 new(state
) ir_variable(fields
[i
].type
,
8378 ralloc_strdup(state
, fields
[i
].name
),
8380 var
->data
.interpolation
= fields
[i
].interpolation
;
8381 var
->data
.centroid
= fields
[i
].centroid
;
8382 var
->data
.sample
= fields
[i
].sample
;
8383 var
->data
.patch
= fields
[i
].patch
;
8384 var
->data
.stream
= qual_stream
;
8385 var
->data
.location
= fields
[i
].location
;
8387 if (fields
[i
].location
!= -1)
8388 var
->data
.explicit_location
= true;
8390 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
8391 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
8393 if (fields
[i
].offset
!= -1)
8394 var
->data
.explicit_xfb_offset
= true;
8395 var
->data
.offset
= fields
[i
].offset
;
8397 var
->init_interface_type(block_type
);
8399 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8400 var
->data
.read_only
= true;
8402 /* Precision qualifiers do not have any meaning in Desktop GLSL */
8403 if (state
->es_shader
) {
8404 var
->data
.precision
=
8405 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
8409 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
8410 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8411 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8413 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
8416 if (var
->data
.mode
== ir_var_shader_storage
)
8417 apply_memory_qualifiers(var
, fields
[i
]);
8419 /* Examine var name here since var may get deleted in the next call */
8420 bool var_is_gl_id
= is_gl_identifier(var
->name
);
8422 if (redeclaring_per_vertex
) {
8423 bool is_redeclaration
;
8425 get_variable_being_redeclared(&var
, loc
, state
,
8426 true /* allow_all_redeclarations */,
8428 if (!var_is_gl_id
|| !is_redeclaration
) {
8429 _mesa_glsl_error(&loc
, state
,
8430 "redeclaration of gl_PerVertex can only "
8431 "include built-in variables");
8432 } else if (var
->data
.how_declared
== ir_var_declared_normally
) {
8433 _mesa_glsl_error(&loc
, state
,
8434 "`%s' has already been redeclared",
8437 var
->data
.how_declared
= ir_var_declared_in_block
;
8438 var
->reinit_interface_type(block_type
);
8443 if (state
->symbols
->get_variable(var
->name
) != NULL
)
8444 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
8446 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
8447 * The UBO declaration itself doesn't get an ir_variable unless it
8448 * has an instance name. This is ugly.
8450 if (this->layout
.flags
.q
.explicit_binding
) {
8451 apply_explicit_binding(state
, &loc
, var
,
8452 var
->get_interface_type(), &this->layout
);
8455 if (var
->type
->is_unsized_array()) {
8456 if (var
->is_in_shader_storage_block() &&
8457 is_unsized_array_last_element(var
)) {
8458 var
->data
.from_ssbo_unsized_array
= true;
8460 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
8462 * "If an array is declared as the last member of a shader storage
8463 * block and the size is not specified at compile-time, it is
8464 * sized at run-time. In all other cases, arrays are sized only
8467 * In desktop GLSL it is allowed to have unsized-arrays that are
8468 * not last, as long as we can determine that they are implicitly
8471 if (state
->es_shader
) {
8472 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
8473 "definition: only last member of a shader "
8474 "storage block can be defined as unsized "
8475 "array", fields
[i
].name
);
8480 state
->symbols
->add_variable(var
);
8481 instructions
->push_tail(var
);
8484 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
8485 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
8487 * It is also a compilation error ... to redeclare a built-in
8488 * block and then use a member from that built-in block that was
8489 * not included in the redeclaration.
8491 * This appears to be a clarification to the behaviour established
8492 * for gl_PerVertex by GLSL 1.50, therefore we implement this
8493 * behaviour regardless of GLSL version.
8495 * To prevent the shader from using a member that was not included in
8496 * the redeclaration, we disable any ir_variables that are still
8497 * associated with the old declaration of gl_PerVertex (since we've
8498 * already updated all of the variables contained in the new
8499 * gl_PerVertex to point to it).
8501 * As a side effect this will prevent
8502 * validate_intrastage_interface_blocks() from getting confused and
8503 * thinking there are conflicting definitions of gl_PerVertex in the
8506 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8507 ir_variable
*const var
= node
->as_variable();
8509 var
->get_interface_type() == earlier_per_vertex
&&
8510 var
->data
.mode
== var_mode
) {
8511 if (var
->data
.how_declared
== ir_var_declared_normally
) {
8512 _mesa_glsl_error(&loc
, state
,
8513 "redeclaration of gl_PerVertex cannot "
8514 "follow a redeclaration of `%s'",
8517 state
->symbols
->disable_variable(var
->name
);
8529 ast_tcs_output_layout::hir(exec_list
*instructions
,
8530 struct _mesa_glsl_parse_state
*state
)
8532 YYLTYPE loc
= this->get_location();
8534 unsigned num_vertices
;
8535 if (!state
->out_qualifier
->vertices
->
8536 process_qualifier_constant(state
, "vertices", &num_vertices
,
8538 /* return here to stop cascading incorrect error messages */
8542 /* If any shader outputs occurred before this declaration and specified an
8543 * array size, make sure the size they specified is consistent with the
8546 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8547 _mesa_glsl_error(&loc
, state
,
8548 "this tessellation control shader output layout "
8549 "specifies %u vertices, but a previous output "
8550 "is declared with size %u",
8551 num_vertices
, state
->tcs_output_size
);
8555 state
->tcs_output_vertices_specified
= true;
8557 /* If any shader outputs occurred before this declaration and did not
8558 * specify an array size, their size is determined now.
8560 foreach_in_list (ir_instruction
, node
, instructions
) {
8561 ir_variable
*var
= node
->as_variable();
8562 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8565 /* Note: Not all tessellation control shader output are arrays. */
8566 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8569 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8570 _mesa_glsl_error(&loc
, state
,
8571 "this tessellation control shader output layout "
8572 "specifies %u vertices, but an access to element "
8573 "%u of output `%s' already exists", num_vertices
,
8574 var
->data
.max_array_access
, var
->name
);
8576 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8586 ast_gs_input_layout::hir(exec_list
*instructions
,
8587 struct _mesa_glsl_parse_state
*state
)
8589 YYLTYPE loc
= this->get_location();
8591 /* Should have been prevented by the parser. */
8592 assert(!state
->gs_input_prim_type_specified
8593 || state
->in_qualifier
->prim_type
== this->prim_type
);
8595 /* If any shader inputs occurred before this declaration and specified an
8596 * array size, make sure the size they specified is consistent with the
8599 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8600 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8601 _mesa_glsl_error(&loc
, state
,
8602 "this geometry shader input layout implies %u vertices"
8603 " per primitive, but a previous input is declared"
8604 " with size %u", num_vertices
, state
->gs_input_size
);
8608 state
->gs_input_prim_type_specified
= true;
8610 /* If any shader inputs occurred before this declaration and did not
8611 * specify an array size, their size is determined now.
8613 foreach_in_list(ir_instruction
, node
, instructions
) {
8614 ir_variable
*var
= node
->as_variable();
8615 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8618 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8622 if (var
->type
->is_unsized_array()) {
8623 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8624 _mesa_glsl_error(&loc
, state
,
8625 "this geometry shader input layout implies %u"
8626 " vertices, but an access to element %u of input"
8627 " `%s' already exists", num_vertices
,
8628 var
->data
.max_array_access
, var
->name
);
8630 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8641 ast_cs_input_layout::hir(exec_list
*instructions
,
8642 struct _mesa_glsl_parse_state
*state
)
8644 YYLTYPE loc
= this->get_location();
8646 /* From the ARB_compute_shader specification:
8648 * If the local size of the shader in any dimension is greater
8649 * than the maximum size supported by the implementation for that
8650 * dimension, a compile-time error results.
8652 * It is not clear from the spec how the error should be reported if
8653 * the total size of the work group exceeds
8654 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8655 * report it at compile time as well.
8657 GLuint64 total_invocations
= 1;
8658 unsigned qual_local_size
[3];
8659 for (int i
= 0; i
< 3; i
++) {
8661 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8663 /* Infer a local_size of 1 for unspecified dimensions */
8664 if (this->local_size
[i
] == NULL
) {
8665 qual_local_size
[i
] = 1;
8666 } else if (!this->local_size
[i
]->
8667 process_qualifier_constant(state
, local_size_str
,
8668 &qual_local_size
[i
], false)) {
8669 ralloc_free(local_size_str
);
8672 ralloc_free(local_size_str
);
8674 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8675 _mesa_glsl_error(&loc
, state
,
8676 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8678 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8681 total_invocations
*= qual_local_size
[i
];
8682 if (total_invocations
>
8683 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8684 _mesa_glsl_error(&loc
, state
,
8685 "product of local_sizes exceeds "
8686 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8687 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8692 /* If any compute input layout declaration preceded this one, make sure it
8693 * was consistent with this one.
8695 if (state
->cs_input_local_size_specified
) {
8696 for (int i
= 0; i
< 3; i
++) {
8697 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8698 _mesa_glsl_error(&loc
, state
,
8699 "compute shader input layout does not match"
8700 " previous declaration");
8706 /* The ARB_compute_variable_group_size spec says:
8708 * If a compute shader including a *local_size_variable* qualifier also
8709 * declares a fixed local group size using the *local_size_x*,
8710 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8713 if (state
->cs_input_local_size_variable_specified
) {
8714 _mesa_glsl_error(&loc
, state
,
8715 "compute shader can't include both a variable and a "
8716 "fixed local group size");
8720 state
->cs_input_local_size_specified
= true;
8721 for (int i
= 0; i
< 3; i
++)
8722 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8724 /* We may now declare the built-in constant gl_WorkGroupSize (see
8725 * builtin_variable_generator::generate_constants() for why we didn't
8726 * declare it earlier).
8728 ir_variable
*var
= new(state
->symbols
)
8729 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8730 var
->data
.how_declared
= ir_var_declared_implicitly
;
8731 var
->data
.read_only
= true;
8732 instructions
->push_tail(var
);
8733 state
->symbols
->add_variable(var
);
8734 ir_constant_data data
;
8735 memset(&data
, 0, sizeof(data
));
8736 for (int i
= 0; i
< 3; i
++)
8737 data
.u
[i
] = qual_local_size
[i
];
8738 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8739 var
->constant_initializer
=
8740 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8741 var
->data
.has_initializer
= true;
8748 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8749 exec_list
*instructions
)
8751 bool gl_FragColor_assigned
= false;
8752 bool gl_FragData_assigned
= false;
8753 bool gl_FragSecondaryColor_assigned
= false;
8754 bool gl_FragSecondaryData_assigned
= false;
8755 bool user_defined_fs_output_assigned
= false;
8756 ir_variable
*user_defined_fs_output
= NULL
;
8758 /* It would be nice to have proper location information. */
8760 memset(&loc
, 0, sizeof(loc
));
8762 foreach_in_list(ir_instruction
, node
, instructions
) {
8763 ir_variable
*var
= node
->as_variable();
8765 if (!var
|| !var
->data
.assigned
)
8768 if (strcmp(var
->name
, "gl_FragColor") == 0)
8769 gl_FragColor_assigned
= true;
8770 else if (strcmp(var
->name
, "gl_FragData") == 0)
8771 gl_FragData_assigned
= true;
8772 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8773 gl_FragSecondaryColor_assigned
= true;
8774 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8775 gl_FragSecondaryData_assigned
= true;
8776 else if (!is_gl_identifier(var
->name
)) {
8777 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8778 var
->data
.mode
== ir_var_shader_out
) {
8779 user_defined_fs_output_assigned
= true;
8780 user_defined_fs_output
= var
;
8785 /* From the GLSL 1.30 spec:
8787 * "If a shader statically assigns a value to gl_FragColor, it
8788 * may not assign a value to any element of gl_FragData. If a
8789 * shader statically writes a value to any element of
8790 * gl_FragData, it may not assign a value to
8791 * gl_FragColor. That is, a shader may assign values to either
8792 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8793 * linked together must also consistently write just one of
8794 * these variables. Similarly, if user declared output
8795 * variables are in use (statically assigned to), then the
8796 * built-in variables gl_FragColor and gl_FragData may not be
8797 * assigned to. These incorrect usages all generate compile
8800 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8801 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8802 "`gl_FragColor' and `gl_FragData'");
8803 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8804 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8805 "`gl_FragColor' and `%s'",
8806 user_defined_fs_output
->name
);
8807 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8808 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8809 "`gl_FragSecondaryColorEXT' and"
8810 " `gl_FragSecondaryDataEXT'");
8811 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8812 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8813 "`gl_FragColor' and"
8814 " `gl_FragSecondaryDataEXT'");
8815 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8816 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8818 " `gl_FragSecondaryColorEXT'");
8819 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8820 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8821 "`gl_FragData' and `%s'",
8822 user_defined_fs_output
->name
);
8825 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8826 !state
->EXT_blend_func_extended_enable
) {
8827 _mesa_glsl_error(&loc
, state
,
8828 "Dual source blending requires EXT_blend_func_extended");
8833 verify_subroutine_associated_funcs(struct _mesa_glsl_parse_state
*state
)
8836 memset(&loc
, 0, sizeof(loc
));
8838 /* Section 6.1.2 (Subroutines) of the GLSL 4.00 spec says:
8840 * "A program will fail to compile or link if any shader
8841 * or stage contains two or more functions with the same
8842 * name if the name is associated with a subroutine type."
8845 for (int i
= 0; i
< state
->num_subroutines
; i
++) {
8846 unsigned definitions
= 0;
8847 ir_function
*fn
= state
->subroutines
[i
];
8848 /* Calculate number of function definitions with the same name */
8849 foreach_in_list(ir_function_signature
, sig
, &fn
->signatures
) {
8850 if (sig
->is_defined
) {
8851 if (++definitions
> 1) {
8852 _mesa_glsl_error(&loc
, state
,
8853 "%s shader contains two or more function "
8854 "definitions with name `%s', which is "
8855 "associated with a subroutine type.\n",
8856 _mesa_shader_stage_to_string(state
->stage
),
8866 remove_per_vertex_blocks(exec_list
*instructions
,
8867 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8869 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8870 * if it exists in this shader type.
8872 const glsl_type
*per_vertex
= NULL
;
8874 case ir_var_shader_in
:
8875 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8876 per_vertex
= gl_in
->get_interface_type();
8878 case ir_var_shader_out
:
8879 if (ir_variable
*gl_Position
=
8880 state
->symbols
->get_variable("gl_Position")) {
8881 per_vertex
= gl_Position
->get_interface_type();
8885 assert(!"Unexpected mode");
8889 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8890 * need to do anything.
8892 if (per_vertex
== NULL
)
8895 /* If the interface block is used by the shader, then we don't need to do
8898 interface_block_usage_visitor
v(mode
, per_vertex
);
8899 v
.run(instructions
);
8900 if (v
.usage_found())
8903 /* Remove any ir_variable declarations that refer to the interface block
8906 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8907 ir_variable
*const var
= node
->as_variable();
8908 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8909 var
->data
.mode
== mode
) {
8910 state
->symbols
->disable_variable(var
->name
);
8917 ast_warnings_toggle::hir(exec_list
*,
8918 struct _mesa_glsl_parse_state
*state
)
8920 state
->warnings_enabled
= enable
;