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_int_to_uint_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
)) {
1693 error_emitted
= true;
1697 type
= arithmetic_result_type(op
[0], op
[1],
1698 (this->oper
== ast_mul_assign
),
1701 if (type
!= orig_type
) {
1702 _mesa_glsl_error(& loc
, state
,
1703 "could not implicitly convert "
1704 "%s to %s", type
->name
, orig_type
->name
);
1705 type
= glsl_type::error_type
;
1708 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1712 do_assignment(instructions
, state
,
1713 this->subexpressions
[0]->non_lvalue_description
,
1714 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1715 &result
, needs_rvalue
, false,
1716 this->subexpressions
[0]->get_location());
1718 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1719 * explicitly test for this because none of the binary expression
1720 * operators allow array operands either.
1726 case ast_mod_assign
: {
1727 this->subexpressions
[0]->set_is_lhs(true);
1728 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1729 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1731 orig_type
= op
[0]->type
;
1732 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1734 if (type
!= orig_type
) {
1735 _mesa_glsl_error(& loc
, state
,
1736 "could not implicitly convert "
1737 "%s to %s", type
->name
, orig_type
->name
);
1738 type
= glsl_type::error_type
;
1741 assert(operations
[this->oper
] == ir_binop_mod
);
1743 ir_rvalue
*temp_rhs
;
1744 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1748 do_assignment(instructions
, state
,
1749 this->subexpressions
[0]->non_lvalue_description
,
1750 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1751 &result
, needs_rvalue
, false,
1752 this->subexpressions
[0]->get_location());
1757 case ast_rs_assign
: {
1758 this->subexpressions
[0]->set_is_lhs(true);
1759 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1760 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1761 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1763 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1764 type
, op
[0], op
[1]);
1766 do_assignment(instructions
, state
,
1767 this->subexpressions
[0]->non_lvalue_description
,
1768 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1769 &result
, needs_rvalue
, false,
1770 this->subexpressions
[0]->get_location());
1774 case ast_and_assign
:
1775 case ast_xor_assign
:
1776 case ast_or_assign
: {
1777 this->subexpressions
[0]->set_is_lhs(true);
1778 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1779 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1781 orig_type
= op
[0]->type
;
1782 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1784 if (type
!= orig_type
) {
1785 _mesa_glsl_error(& loc
, state
,
1786 "could not implicitly convert "
1787 "%s to %s", type
->name
, orig_type
->name
);
1788 type
= glsl_type::error_type
;
1791 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1792 type
, op
[0], op
[1]);
1794 do_assignment(instructions
, state
,
1795 this->subexpressions
[0]->non_lvalue_description
,
1796 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1797 &result
, needs_rvalue
, false,
1798 this->subexpressions
[0]->get_location());
1802 case ast_conditional
: {
1803 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1805 * "The ternary selection operator (?:). It operates on three
1806 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1807 * first expression, which must result in a scalar Boolean."
1809 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1810 "condition", &error_emitted
);
1812 /* The :? operator is implemented by generating an anonymous temporary
1813 * followed by an if-statement. The last instruction in each branch of
1814 * the if-statement assigns a value to the anonymous temporary. This
1815 * temporary is the r-value of the expression.
1817 exec_list then_instructions
;
1818 exec_list else_instructions
;
1820 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1821 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1823 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1825 * "The second and third expressions can be any type, as
1826 * long their types match, or there is a conversion in
1827 * Section 4.1.10 "Implicit Conversions" that can be applied
1828 * to one of the expressions to make their types match. This
1829 * resulting matching type is the type of the entire
1832 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1833 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1834 || (op
[1]->type
!= op
[2]->type
)) {
1835 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1837 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1838 "operator must have matching types");
1839 error_emitted
= true;
1840 type
= glsl_type::error_type
;
1845 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1847 * "The second and third expressions must be the same type, but can
1848 * be of any type other than an array."
1850 if (type
->is_array() &&
1851 !state
->check_version(120, 300, &loc
,
1852 "second and third operands of ?: operator "
1853 "cannot be arrays")) {
1854 error_emitted
= true;
1857 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1859 * "Except for array indexing, structure member selection, and
1860 * parentheses, opaque variables are not allowed to be operands in
1861 * expressions; such use results in a compile-time error."
1863 if (type
->contains_opaque()) {
1864 if (!(state
->has_bindless() && (type
->is_image() || type
->is_sampler()))) {
1865 _mesa_glsl_error(&loc
, state
, "variables of type %s cannot be "
1866 "operands of the ?: operator", type
->name
);
1867 error_emitted
= true;
1871 ir_constant
*cond_val
= op
[0]->constant_expression_value(ctx
);
1873 if (then_instructions
.is_empty()
1874 && else_instructions
.is_empty()
1875 && cond_val
!= NULL
) {
1876 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1878 /* The copy to conditional_tmp reads the whole array. */
1879 if (type
->is_array()) {
1880 mark_whole_array_access(op
[1]);
1881 mark_whole_array_access(op
[2]);
1884 ir_variable
*const tmp
=
1885 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1886 instructions
->push_tail(tmp
);
1888 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1889 instructions
->push_tail(stmt
);
1891 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1892 ir_dereference
*const then_deref
=
1893 new(ctx
) ir_dereference_variable(tmp
);
1894 ir_assignment
*const then_assign
=
1895 new(ctx
) ir_assignment(then_deref
, op
[1]);
1896 stmt
->then_instructions
.push_tail(then_assign
);
1898 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1899 ir_dereference
*const else_deref
=
1900 new(ctx
) ir_dereference_variable(tmp
);
1901 ir_assignment
*const else_assign
=
1902 new(ctx
) ir_assignment(else_deref
, op
[2]);
1903 stmt
->else_instructions
.push_tail(else_assign
);
1905 result
= new(ctx
) ir_dereference_variable(tmp
);
1912 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1913 ? "pre-increment operation" : "pre-decrement operation";
1915 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1916 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1918 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1920 ir_rvalue
*temp_rhs
;
1921 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1925 do_assignment(instructions
, state
,
1926 this->subexpressions
[0]->non_lvalue_description
,
1927 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1928 &result
, needs_rvalue
, false,
1929 this->subexpressions
[0]->get_location());
1934 case ast_post_dec
: {
1935 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1936 ? "post-increment operation" : "post-decrement operation";
1937 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1938 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1940 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1942 if (error_emitted
) {
1943 result
= ir_rvalue::error_value(ctx
);
1947 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1949 ir_rvalue
*temp_rhs
;
1950 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1953 /* Get a temporary of a copy of the lvalue before it's modified.
1954 * This may get thrown away later.
1956 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1958 ir_rvalue
*junk_rvalue
;
1960 do_assignment(instructions
, state
,
1961 this->subexpressions
[0]->non_lvalue_description
,
1962 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1963 &junk_rvalue
, false, false,
1964 this->subexpressions
[0]->get_location());
1969 case ast_field_selection
:
1970 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1973 case ast_array_index
: {
1974 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1976 /* Getting if an array is being used uninitialized is beyond what we get
1977 * from ir_value.data.assigned. Setting is_lhs as true would force to
1978 * not raise a uninitialized warning when using an array
1980 subexpressions
[0]->set_is_lhs(true);
1981 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1982 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1984 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1987 if (result
->type
->is_error())
1988 error_emitted
= true;
1993 case ast_unsized_array_dim
:
1994 unreachable("ast_unsized_array_dim: Should never get here.");
1996 case ast_function_call
:
1997 /* Should *NEVER* get here. ast_function_call should always be handled
1998 * by ast_function_expression::hir.
2000 unreachable("ast_function_call: handled elsewhere ");
2002 case ast_identifier
: {
2003 /* ast_identifier can appear several places in a full abstract syntax
2004 * tree. This particular use must be at location specified in the grammar
2005 * as 'variable_identifier'.
2008 state
->symbols
->get_variable(this->primary_expression
.identifier
);
2011 /* the identifier might be a subroutine name */
2013 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
2014 var
= state
->symbols
->get_variable(sub_name
);
2015 ralloc_free(sub_name
);
2019 var
->data
.used
= true;
2020 result
= new(ctx
) ir_dereference_variable(var
);
2022 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
2024 && result
->variable_referenced()->data
.assigned
!= true
2025 && !is_gl_identifier(var
->name
)) {
2026 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
2027 this->primary_expression
.identifier
);
2030 /* From the EXT_shader_framebuffer_fetch spec:
2032 * "Unless the GL_EXT_shader_framebuffer_fetch extension has been
2033 * enabled in addition, it's an error to use gl_LastFragData if it
2034 * hasn't been explicitly redeclared with layout(noncoherent)."
2036 if (var
->data
.fb_fetch_output
&& var
->data
.memory_coherent
&&
2037 !state
->EXT_shader_framebuffer_fetch_enable
) {
2038 _mesa_glsl_error(&loc
, state
,
2039 "invalid use of framebuffer fetch output not "
2040 "qualified with layout(noncoherent)");
2044 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
2045 this->primary_expression
.identifier
);
2047 result
= ir_rvalue::error_value(ctx
);
2048 error_emitted
= true;
2053 case ast_int_constant
:
2054 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
2057 case ast_uint_constant
:
2058 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
2061 case ast_float_constant
:
2062 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
2065 case ast_bool_constant
:
2066 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2069 case ast_double_constant
:
2070 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2073 case ast_uint64_constant
:
2074 result
= new(ctx
) ir_constant(this->primary_expression
.uint64_constant
);
2077 case ast_int64_constant
:
2078 result
= new(ctx
) ir_constant(this->primary_expression
.int64_constant
);
2081 case ast_sequence
: {
2082 /* It should not be possible to generate a sequence in the AST without
2083 * any expressions in it.
2085 assert(!this->expressions
.is_empty());
2087 /* The r-value of a sequence is the last expression in the sequence. If
2088 * the other expressions in the sequence do not have side-effects (and
2089 * therefore add instructions to the instruction list), they get dropped
2092 exec_node
*previous_tail
= NULL
;
2093 YYLTYPE previous_operand_loc
= loc
;
2095 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2096 /* If one of the operands of comma operator does not generate any
2097 * code, we want to emit a warning. At each pass through the loop
2098 * previous_tail will point to the last instruction in the stream
2099 * *before* processing the previous operand. Naturally,
2100 * instructions->get_tail_raw() will point to the last instruction in
2101 * the stream *after* processing the previous operand. If the two
2102 * pointers match, then the previous operand had no effect.
2104 * The warning behavior here differs slightly from GCC. GCC will
2105 * only emit a warning if none of the left-hand operands have an
2106 * effect. However, it will emit a warning for each. I believe that
2107 * there are some cases in C (especially with GCC extensions) where
2108 * it is useful to have an intermediate step in a sequence have no
2109 * effect, but I don't think these cases exist in GLSL. Either way,
2110 * it would be a giant hassle to replicate that behavior.
2112 if (previous_tail
== instructions
->get_tail_raw()) {
2113 _mesa_glsl_warning(&previous_operand_loc
, state
,
2114 "left-hand operand of comma expression has "
2118 /* The tail is directly accessed instead of using the get_tail()
2119 * method for performance reasons. get_tail() has extra code to
2120 * return NULL when the list is empty. We don't care about that
2121 * here, so using get_tail_raw() is fine.
2123 previous_tail
= instructions
->get_tail_raw();
2124 previous_operand_loc
= ast
->get_location();
2126 result
= ast
->hir(instructions
, state
);
2129 /* Any errors should have already been emitted in the loop above.
2131 error_emitted
= true;
2135 type
= NULL
; /* use result->type, not type. */
2136 assert(error_emitted
|| (result
!= NULL
|| !needs_rvalue
));
2138 if (result
&& result
->type
->is_error() && !error_emitted
)
2139 _mesa_glsl_error(& loc
, state
, "type mismatch");
2145 ast_expression::has_sequence_subexpression() const
2147 switch (this->oper
) {
2156 return this->subexpressions
[0]->has_sequence_subexpression();
2178 case ast_array_index
:
2179 case ast_mul_assign
:
2180 case ast_div_assign
:
2181 case ast_add_assign
:
2182 case ast_sub_assign
:
2183 case ast_mod_assign
:
2186 case ast_and_assign
:
2187 case ast_xor_assign
:
2189 return this->subexpressions
[0]->has_sequence_subexpression() ||
2190 this->subexpressions
[1]->has_sequence_subexpression();
2192 case ast_conditional
:
2193 return this->subexpressions
[0]->has_sequence_subexpression() ||
2194 this->subexpressions
[1]->has_sequence_subexpression() ||
2195 this->subexpressions
[2]->has_sequence_subexpression();
2200 case ast_field_selection
:
2201 case ast_identifier
:
2202 case ast_int_constant
:
2203 case ast_uint_constant
:
2204 case ast_float_constant
:
2205 case ast_bool_constant
:
2206 case ast_double_constant
:
2207 case ast_int64_constant
:
2208 case ast_uint64_constant
:
2214 case ast_function_call
:
2215 unreachable("should be handled by ast_function_expression::hir");
2217 case ast_unsized_array_dim
:
2218 unreachable("ast_unsized_array_dim: Should never get here.");
2225 ast_expression_statement::hir(exec_list
*instructions
,
2226 struct _mesa_glsl_parse_state
*state
)
2228 /* It is possible to have expression statements that don't have an
2229 * expression. This is the solitary semicolon:
2231 * for (i = 0; i < 5; i++)
2234 * In this case the expression will be NULL. Test for NULL and don't do
2235 * anything in that case.
2237 if (expression
!= NULL
)
2238 expression
->hir_no_rvalue(instructions
, state
);
2240 /* Statements do not have r-values.
2247 ast_compound_statement::hir(exec_list
*instructions
,
2248 struct _mesa_glsl_parse_state
*state
)
2251 state
->symbols
->push_scope();
2253 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2254 ast
->hir(instructions
, state
);
2257 state
->symbols
->pop_scope();
2259 /* Compound statements do not have r-values.
2265 * Evaluate the given exec_node (which should be an ast_node representing
2266 * a single array dimension) and return its integer value.
2269 process_array_size(exec_node
*node
,
2270 struct _mesa_glsl_parse_state
*state
)
2272 void *mem_ctx
= state
;
2274 exec_list dummy_instructions
;
2276 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2279 * Dimensions other than the outermost dimension can by unsized if they
2280 * are immediately sized by a constructor or initializer.
2282 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2285 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2286 YYLTYPE loc
= array_size
->get_location();
2289 _mesa_glsl_error(& loc
, state
,
2290 "array size could not be resolved");
2294 if (!ir
->type
->is_integer_32()) {
2295 _mesa_glsl_error(& loc
, state
,
2296 "array size must be integer type");
2300 if (!ir
->type
->is_scalar()) {
2301 _mesa_glsl_error(& loc
, state
,
2302 "array size must be scalar type");
2306 ir_constant
*const size
= ir
->constant_expression_value(mem_ctx
);
2308 (state
->is_version(120, 300) &&
2309 array_size
->has_sequence_subexpression())) {
2310 _mesa_glsl_error(& loc
, state
, "array size must be a "
2311 "constant valued expression");
2315 if (size
->value
.i
[0] <= 0) {
2316 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2320 assert(size
->type
== ir
->type
);
2322 /* If the array size is const (and we've verified that
2323 * it is) then no instructions should have been emitted
2324 * when we converted it to HIR. If they were emitted,
2325 * then either the array size isn't const after all, or
2326 * we are emitting unnecessary instructions.
2328 assert(dummy_instructions
.is_empty());
2330 return size
->value
.u
[0];
2333 static const glsl_type
*
2334 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2335 ast_array_specifier
*array_specifier
,
2336 struct _mesa_glsl_parse_state
*state
)
2338 const glsl_type
*array_type
= base
;
2340 if (array_specifier
!= NULL
) {
2341 if (base
->is_array()) {
2343 /* From page 19 (page 25) of the GLSL 1.20 spec:
2345 * "Only one-dimensional arrays may be declared."
2347 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2348 return glsl_type::error_type
;
2352 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2353 !node
->is_head_sentinel(); node
= node
->prev
) {
2354 unsigned array_size
= process_array_size(node
, state
);
2355 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2363 precision_qualifier_allowed(const glsl_type
*type
)
2365 /* Precision qualifiers apply to floating point, integer and opaque
2368 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2369 * "Any floating point or any integer declaration can have the type
2370 * preceded by one of these precision qualifiers [...] Literal
2371 * constants do not have precision qualifiers. Neither do Boolean
2374 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2377 * "Precision qualifiers are added for code portability with OpenGL
2378 * ES, not for functionality. They have the same syntax as in OpenGL
2381 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2383 * "uniform lowp sampler2D sampler;
2386 * lowp vec4 col = texture2D (sampler, coord);
2387 * // texture2D returns lowp"
2389 * From this, we infer that GLSL 1.30 (and later) should allow precision
2390 * qualifiers on sampler types just like float and integer types.
2392 const glsl_type
*const t
= type
->without_array();
2394 return (t
->is_float() || t
->is_integer_32() || t
->contains_opaque()) &&
2399 ast_type_specifier::glsl_type(const char **name
,
2400 struct _mesa_glsl_parse_state
*state
) const
2402 const struct glsl_type
*type
;
2404 if (this->type
!= NULL
)
2407 type
= structure
->type
;
2409 type
= state
->symbols
->get_type(this->type_name
);
2410 *name
= this->type_name
;
2412 YYLTYPE loc
= this->get_location();
2413 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2419 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2421 * "The precision statement
2423 * precision precision-qualifier type;
2425 * can be used to establish a default precision qualifier. The type field can
2426 * be either int or float or any of the sampler types, (...) If type is float,
2427 * the directive applies to non-precision-qualified floating point type
2428 * (scalar, vector, and matrix) declarations. If type is int, the directive
2429 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2430 * and unsigned) declarations."
2432 * We use the symbol table to keep the values of the default precisions for
2433 * each 'type' in each scope and we use the 'type' string from the precision
2434 * statement as key in the symbol table. When we want to retrieve the default
2435 * precision associated with a given glsl_type we need to know the type string
2436 * associated with it. This is what this function returns.
2439 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2441 switch (type
->base_type
) {
2442 case GLSL_TYPE_FLOAT
:
2444 case GLSL_TYPE_UINT
:
2447 case GLSL_TYPE_ATOMIC_UINT
:
2448 return "atomic_uint";
2449 case GLSL_TYPE_IMAGE
:
2451 case GLSL_TYPE_SAMPLER
: {
2452 const unsigned type_idx
=
2453 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2454 const unsigned offset
= type
->is_sampler() ? 0 : 4;
2455 assert(type_idx
< 4);
2456 switch (type
->sampled_type
) {
2457 case GLSL_TYPE_FLOAT
:
2458 switch (type
->sampler_dimensionality
) {
2459 case GLSL_SAMPLER_DIM_1D
: {
2460 assert(type
->is_sampler());
2461 static const char *const names
[4] = {
2462 "sampler1D", "sampler1DArray",
2463 "sampler1DShadow", "sampler1DArrayShadow"
2465 return names
[type_idx
];
2467 case GLSL_SAMPLER_DIM_2D
: {
2468 static const char *const names
[8] = {
2469 "sampler2D", "sampler2DArray",
2470 "sampler2DShadow", "sampler2DArrayShadow",
2471 "image2D", "image2DArray", NULL
, NULL
2473 return names
[offset
+ type_idx
];
2475 case GLSL_SAMPLER_DIM_3D
: {
2476 static const char *const names
[8] = {
2477 "sampler3D", NULL
, NULL
, NULL
,
2478 "image3D", NULL
, NULL
, NULL
2480 return names
[offset
+ type_idx
];
2482 case GLSL_SAMPLER_DIM_CUBE
: {
2483 static const char *const names
[8] = {
2484 "samplerCube", "samplerCubeArray",
2485 "samplerCubeShadow", "samplerCubeArrayShadow",
2486 "imageCube", NULL
, NULL
, NULL
2488 return names
[offset
+ type_idx
];
2490 case GLSL_SAMPLER_DIM_MS
: {
2491 assert(type
->is_sampler());
2492 static const char *const names
[4] = {
2493 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2495 return names
[type_idx
];
2497 case GLSL_SAMPLER_DIM_RECT
: {
2498 assert(type
->is_sampler());
2499 static const char *const names
[4] = {
2500 "samplerRect", NULL
, "samplerRectShadow", NULL
2502 return names
[type_idx
];
2504 case GLSL_SAMPLER_DIM_BUF
: {
2505 static const char *const names
[8] = {
2506 "samplerBuffer", NULL
, NULL
, NULL
,
2507 "imageBuffer", NULL
, NULL
, NULL
2509 return names
[offset
+ type_idx
];
2511 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2512 assert(type
->is_sampler());
2513 static const char *const names
[4] = {
2514 "samplerExternalOES", NULL
, NULL
, NULL
2516 return names
[type_idx
];
2519 unreachable("Unsupported sampler/image dimensionality");
2520 } /* sampler/image float dimensionality */
2523 switch (type
->sampler_dimensionality
) {
2524 case GLSL_SAMPLER_DIM_1D
: {
2525 assert(type
->is_sampler());
2526 static const char *const names
[4] = {
2527 "isampler1D", "isampler1DArray", NULL
, NULL
2529 return names
[type_idx
];
2531 case GLSL_SAMPLER_DIM_2D
: {
2532 static const char *const names
[8] = {
2533 "isampler2D", "isampler2DArray", NULL
, NULL
,
2534 "iimage2D", "iimage2DArray", NULL
, NULL
2536 return names
[offset
+ type_idx
];
2538 case GLSL_SAMPLER_DIM_3D
: {
2539 static const char *const names
[8] = {
2540 "isampler3D", NULL
, NULL
, NULL
,
2541 "iimage3D", NULL
, NULL
, NULL
2543 return names
[offset
+ type_idx
];
2545 case GLSL_SAMPLER_DIM_CUBE
: {
2546 static const char *const names
[8] = {
2547 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2548 "iimageCube", NULL
, NULL
, NULL
2550 return names
[offset
+ type_idx
];
2552 case GLSL_SAMPLER_DIM_MS
: {
2553 assert(type
->is_sampler());
2554 static const char *const names
[4] = {
2555 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2557 return names
[type_idx
];
2559 case GLSL_SAMPLER_DIM_RECT
: {
2560 assert(type
->is_sampler());
2561 static const char *const names
[4] = {
2562 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2564 return names
[type_idx
];
2566 case GLSL_SAMPLER_DIM_BUF
: {
2567 static const char *const names
[8] = {
2568 "isamplerBuffer", NULL
, NULL
, NULL
,
2569 "iimageBuffer", NULL
, NULL
, NULL
2571 return names
[offset
+ type_idx
];
2574 unreachable("Unsupported isampler/iimage dimensionality");
2575 } /* sampler/image int dimensionality */
2577 case GLSL_TYPE_UINT
:
2578 switch (type
->sampler_dimensionality
) {
2579 case GLSL_SAMPLER_DIM_1D
: {
2580 assert(type
->is_sampler());
2581 static const char *const names
[4] = {
2582 "usampler1D", "usampler1DArray", NULL
, NULL
2584 return names
[type_idx
];
2586 case GLSL_SAMPLER_DIM_2D
: {
2587 static const char *const names
[8] = {
2588 "usampler2D", "usampler2DArray", NULL
, NULL
,
2589 "uimage2D", "uimage2DArray", NULL
, NULL
2591 return names
[offset
+ type_idx
];
2593 case GLSL_SAMPLER_DIM_3D
: {
2594 static const char *const names
[8] = {
2595 "usampler3D", NULL
, NULL
, NULL
,
2596 "uimage3D", NULL
, NULL
, NULL
2598 return names
[offset
+ type_idx
];
2600 case GLSL_SAMPLER_DIM_CUBE
: {
2601 static const char *const names
[8] = {
2602 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2603 "uimageCube", NULL
, NULL
, NULL
2605 return names
[offset
+ type_idx
];
2607 case GLSL_SAMPLER_DIM_MS
: {
2608 assert(type
->is_sampler());
2609 static const char *const names
[4] = {
2610 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2612 return names
[type_idx
];
2614 case GLSL_SAMPLER_DIM_RECT
: {
2615 assert(type
->is_sampler());
2616 static const char *const names
[4] = {
2617 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2619 return names
[type_idx
];
2621 case GLSL_SAMPLER_DIM_BUF
: {
2622 static const char *const names
[8] = {
2623 "usamplerBuffer", NULL
, NULL
, NULL
,
2624 "uimageBuffer", NULL
, NULL
, NULL
2626 return names
[offset
+ type_idx
];
2629 unreachable("Unsupported usampler/uimage dimensionality");
2630 } /* sampler/image uint dimensionality */
2633 unreachable("Unsupported sampler/image type");
2634 } /* sampler/image type */
2636 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2639 unreachable("Unsupported type");
2644 select_gles_precision(unsigned qual_precision
,
2645 const glsl_type
*type
,
2646 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2648 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2649 * In GLES we take the precision from the type qualifier if present,
2650 * otherwise, if the type of the variable allows precision qualifiers at
2651 * all, we look for the default precision qualifier for that type in the
2654 assert(state
->es_shader
);
2656 unsigned precision
= GLSL_PRECISION_NONE
;
2657 if (qual_precision
) {
2658 precision
= qual_precision
;
2659 } else if (precision_qualifier_allowed(type
)) {
2660 const char *type_name
=
2661 get_type_name_for_precision_qualifier(type
->without_array());
2662 assert(type_name
!= NULL
);
2665 state
->symbols
->get_default_precision_qualifier(type_name
);
2666 if (precision
== ast_precision_none
) {
2667 _mesa_glsl_error(loc
, state
,
2668 "No precision specified in this scope for type `%s'",
2674 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2676 * "The default precision of all atomic types is highp. It is an error to
2677 * declare an atomic type with a different precision or to specify the
2678 * default precision for an atomic type to be lowp or mediump."
2680 if (type
->is_atomic_uint() && precision
!= ast_precision_high
) {
2681 _mesa_glsl_error(loc
, state
,
2682 "atomic_uint can only have highp precision qualifier");
2689 ast_fully_specified_type::glsl_type(const char **name
,
2690 struct _mesa_glsl_parse_state
*state
) const
2692 return this->specifier
->glsl_type(name
, state
);
2696 * Determine whether a toplevel variable declaration declares a varying. This
2697 * function operates by examining the variable's mode and the shader target,
2698 * so it correctly identifies linkage variables regardless of whether they are
2699 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2701 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2702 * this function will produce undefined results.
2705 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2708 case MESA_SHADER_VERTEX
:
2709 return var
->data
.mode
== ir_var_shader_out
;
2710 case MESA_SHADER_FRAGMENT
:
2711 return var
->data
.mode
== ir_var_shader_in
||
2712 (var
->data
.mode
== ir_var_system_value
&&
2713 var
->data
.location
== SYSTEM_VALUE_FRAG_COORD
);
2715 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2720 is_allowed_invariant(ir_variable
*var
, struct _mesa_glsl_parse_state
*state
)
2722 if (is_varying_var(var
, state
->stage
))
2725 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
2726 * "Only variables output from a vertex shader can be candidates
2729 if (!state
->is_version(130, 100))
2733 * Later specs remove this language - so allowed invariant
2734 * on fragment shader outputs as well.
2736 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
2737 var
->data
.mode
== ir_var_shader_out
)
2743 * Matrix layout qualifiers are only allowed on certain types
2746 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2748 const glsl_type
*type
,
2751 if (var
&& !var
->is_in_buffer_block()) {
2752 /* Layout qualifiers may only apply to interface blocks and fields in
2755 _mesa_glsl_error(loc
, state
,
2756 "uniform block layout qualifiers row_major and "
2757 "column_major may not be applied to variables "
2758 "outside of uniform blocks");
2759 } else if (!type
->without_array()->is_matrix()) {
2760 /* The OpenGL ES 3.0 conformance tests did not originally allow
2761 * matrix layout qualifiers on non-matrices. However, the OpenGL
2762 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2763 * amended to specifically allow these layouts on all types. Emit
2764 * a warning so that people know their code may not be portable.
2766 _mesa_glsl_warning(loc
, state
,
2767 "uniform block layout qualifiers row_major and "
2768 "column_major applied to non-matrix types may "
2769 "be rejected by older compilers");
2774 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2775 struct _mesa_glsl_parse_state
*state
,
2776 unsigned xfb_buffer
) {
2777 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2778 _mesa_glsl_error(loc
, state
,
2779 "invalid xfb_buffer specified %d is larger than "
2780 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2782 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2789 /* From the ARB_enhanced_layouts spec:
2791 * "Variables and block members qualified with *xfb_offset* can be
2792 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2793 * The offset must be a multiple of the size of the first component of
2794 * the first qualified variable or block member, or a compile-time error
2795 * results. Further, if applied to an aggregate containing a double,
2796 * the offset must also be a multiple of 8, and the space taken in the
2797 * buffer will be a multiple of 8.
2800 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2801 struct _mesa_glsl_parse_state
*state
,
2802 int xfb_offset
, const glsl_type
*type
,
2803 unsigned component_size
) {
2804 const glsl_type
*t_without_array
= type
->without_array();
2806 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2807 _mesa_glsl_error(loc
, state
,
2808 "xfb_offset can't be used with unsized arrays.");
2812 /* Make sure nested structs don't contain unsized arrays, and validate
2813 * any xfb_offsets on interface members.
2815 if (t_without_array
->is_struct() || t_without_array
->is_interface())
2816 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2817 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2819 /* When the interface block doesn't have an xfb_offset qualifier then
2820 * we apply the component size rules at the member level.
2822 if (xfb_offset
== -1)
2823 component_size
= member_t
->contains_double() ? 8 : 4;
2825 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2826 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2830 /* Nested structs or interface block without offset may not have had an
2831 * offset applied yet so return.
2833 if (xfb_offset
== -1) {
2837 if (xfb_offset
% component_size
) {
2838 _mesa_glsl_error(loc
, state
,
2839 "invalid qualifier xfb_offset=%d must be a multiple "
2840 "of the first component size of the first qualified "
2841 "variable or block member. Or double if an aggregate "
2842 "that contains a double (%d).",
2843 xfb_offset
, component_size
);
2851 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2854 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2855 _mesa_glsl_error(loc
, state
,
2856 "invalid stream specified %d is larger than "
2857 "MAX_VERTEX_STREAMS - 1 (%d).",
2858 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2866 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2869 const glsl_type
*type
,
2870 const ast_type_qualifier
*qual
)
2872 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2873 _mesa_glsl_error(loc
, state
,
2874 "the \"binding\" qualifier only applies to uniforms and "
2875 "shader storage buffer objects");
2879 unsigned qual_binding
;
2880 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2885 const struct gl_context
*const ctx
= state
->ctx
;
2886 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2887 unsigned max_index
= qual_binding
+ elements
- 1;
2888 const glsl_type
*base_type
= type
->without_array();
2890 if (base_type
->is_interface()) {
2891 /* UBOs. From page 60 of the GLSL 4.20 specification:
2892 * "If the binding point for any uniform block instance is less than zero,
2893 * or greater than or equal to the implementation-dependent maximum
2894 * number of uniform buffer bindings, a compilation error will occur.
2895 * When the binding identifier is used with a uniform block instanced as
2896 * an array of size N, all elements of the array from binding through
2897 * binding + N – 1 must be within this range."
2899 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2901 if (qual
->flags
.q
.uniform
&&
2902 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2903 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2904 "the maximum number of UBO binding points (%d)",
2905 qual_binding
, elements
,
2906 ctx
->Const
.MaxUniformBufferBindings
);
2910 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2911 * "If the binding point for any uniform or shader storage block instance
2912 * is less than zero, or greater than or equal to the
2913 * implementation-dependent maximum number of uniform buffer bindings, a
2914 * compile-time error will occur. When the binding identifier is used
2915 * with a uniform or shader storage block instanced as an array of size
2916 * N, all elements of the array from binding through binding + N – 1 must
2917 * be within this range."
2919 if (qual
->flags
.q
.buffer
&&
2920 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2921 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2922 "the maximum number of SSBO binding points (%d)",
2923 qual_binding
, elements
,
2924 ctx
->Const
.MaxShaderStorageBufferBindings
);
2927 } else if (base_type
->is_sampler()) {
2928 /* Samplers. From page 63 of the GLSL 4.20 specification:
2929 * "If the binding is less than zero, or greater than or equal to the
2930 * implementation-dependent maximum supported number of units, a
2931 * compilation error will occur. When the binding identifier is used
2932 * with an array of size N, all elements of the array from binding
2933 * through binding + N - 1 must be within this range."
2935 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2937 if (max_index
>= limit
) {
2938 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2939 "exceeds the maximum number of texture image units "
2940 "(%u)", qual_binding
, elements
, limit
);
2944 } else if (base_type
->contains_atomic()) {
2945 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2946 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2947 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2948 "maximum number of atomic counter buffer bindings "
2949 "(%u)", qual_binding
,
2950 ctx
->Const
.MaxAtomicBufferBindings
);
2954 } else if ((state
->is_version(420, 310) ||
2955 state
->ARB_shading_language_420pack_enable
) &&
2956 base_type
->is_image()) {
2957 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2958 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2959 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2960 "maximum number of image units (%d)", max_index
,
2961 ctx
->Const
.MaxImageUnits
);
2966 _mesa_glsl_error(loc
, state
,
2967 "the \"binding\" qualifier only applies to uniform "
2968 "blocks, storage blocks, opaque variables, or arrays "
2973 var
->data
.explicit_binding
= true;
2974 var
->data
.binding
= qual_binding
;
2980 validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state
*state
,
2982 const glsl_interp_mode interpolation
,
2983 const struct glsl_type
*var_type
,
2984 ir_variable_mode mode
)
2986 if (state
->stage
!= MESA_SHADER_FRAGMENT
||
2987 interpolation
== INTERP_MODE_FLAT
||
2988 mode
!= ir_var_shader_in
)
2991 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2992 * so must integer vertex outputs.
2994 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2995 * "Fragment shader inputs that are signed or unsigned integers or
2996 * integer vectors must be qualified with the interpolation qualifier
2999 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3000 * "Fragment shader inputs that are, or contain, signed or unsigned
3001 * integers or integer vectors must be qualified with the
3002 * interpolation qualifier flat."
3004 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3005 * "Vertex shader outputs that are, or contain, signed or unsigned
3006 * integers or integer vectors must be qualified with the
3007 * interpolation qualifier flat."
3009 * Note that prior to GLSL 1.50, this requirement applied to vertex
3010 * outputs rather than fragment inputs. That creates problems in the
3011 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3012 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3013 * apply the restriction to both vertex outputs and fragment inputs.
3015 * Note also that the desktop GLSL specs are missing the text "or
3016 * contain"; this is presumably an oversight, since there is no
3017 * reasonable way to interpolate a fragment shader input that contains
3018 * an integer. See Khronos bug #15671.
3020 if ((state
->is_version(130, 300) || state
->EXT_gpu_shader4_enable
)
3021 && var_type
->contains_integer()) {
3022 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3023 "an integer, then it must be qualified with 'flat'");
3026 /* Double fragment inputs must be qualified with 'flat'.
3028 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
3029 * "This extension does not support interpolation of double-precision
3030 * values; doubles used as fragment shader inputs must be qualified as
3033 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
3034 * "Fragment shader inputs that are signed or unsigned integers, integer
3035 * vectors, or any double-precision floating-point type must be
3036 * qualified with the interpolation qualifier flat."
3038 * Note that the GLSL specs are missing the text "or contain"; this is
3039 * presumably an oversight. See Khronos bug #15671.
3041 * The 'double' type does not exist in GLSL ES so far.
3043 if (state
->has_double()
3044 && var_type
->contains_double()) {
3045 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3046 "a double, then it must be qualified with 'flat'");
3049 /* Bindless sampler/image fragment inputs must be qualified with 'flat'.
3051 * From section 4.3.4 of the ARB_bindless_texture spec:
3053 * "(modify last paragraph, p. 35, allowing samplers and images as
3054 * fragment shader inputs) ... Fragment inputs can only be signed and
3055 * unsigned integers and integer vectors, floating point scalars,
3056 * floating-point vectors, matrices, sampler and image types, or arrays
3057 * or structures of these. Fragment shader inputs that are signed or
3058 * unsigned integers, integer vectors, or any double-precision floating-
3059 * point type, or any sampler or image type must be qualified with the
3060 * interpolation qualifier "flat"."
3062 if (state
->has_bindless()
3063 && (var_type
->contains_sampler() || var_type
->contains_image())) {
3064 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3065 "a bindless sampler (or image), then it must be "
3066 "qualified with 'flat'");
3071 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
3073 const glsl_interp_mode interpolation
,
3074 const struct ast_type_qualifier
*qual
,
3075 const struct glsl_type
*var_type
,
3076 ir_variable_mode mode
)
3078 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
3079 * not to vertex shader inputs nor fragment shader outputs.
3081 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3082 * "Outputs from a vertex shader (out) and inputs to a fragment
3083 * shader (in) can be further qualified with one or more of these
3084 * interpolation qualifiers"
3086 * "These interpolation qualifiers may only precede the qualifiers in,
3087 * centroid in, out, or centroid out in a declaration. They do not apply
3088 * to the deprecated storage qualifiers varying or centroid
3089 * varying. They also do not apply to inputs into a vertex shader or
3090 * outputs from a fragment shader."
3092 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
3093 * "Outputs from a shader (out) and inputs to a shader (in) can be
3094 * further qualified with one of these interpolation qualifiers."
3096 * "These interpolation qualifiers may only precede the qualifiers
3097 * in, centroid in, out, or centroid out in a declaration. They do
3098 * not apply to inputs into a vertex shader or outputs from a
3101 if ((state
->is_version(130, 300) || state
->EXT_gpu_shader4_enable
)
3102 && interpolation
!= INTERP_MODE_NONE
) {
3103 const char *i
= interpolation_string(interpolation
);
3104 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
3105 _mesa_glsl_error(loc
, state
,
3106 "interpolation qualifier `%s' can only be applied to "
3107 "shader inputs or outputs.", i
);
3109 switch (state
->stage
) {
3110 case MESA_SHADER_VERTEX
:
3111 if (mode
== ir_var_shader_in
) {
3112 _mesa_glsl_error(loc
, state
,
3113 "interpolation qualifier '%s' cannot be applied to "
3114 "vertex shader inputs", i
);
3117 case MESA_SHADER_FRAGMENT
:
3118 if (mode
== ir_var_shader_out
) {
3119 _mesa_glsl_error(loc
, state
,
3120 "interpolation qualifier '%s' cannot be applied to "
3121 "fragment shader outputs", i
);
3129 /* Interpolation qualifiers cannot be applied to 'centroid' and
3130 * 'centroid varying'.
3132 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3133 * "interpolation qualifiers may only precede the qualifiers in,
3134 * centroid in, out, or centroid out in a declaration. They do not apply
3135 * to the deprecated storage qualifiers varying or centroid varying."
3137 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3139 * GL_EXT_gpu_shader4 allows this.
3141 if (state
->is_version(130, 0) && !state
->EXT_gpu_shader4_enable
3142 && interpolation
!= INTERP_MODE_NONE
3143 && qual
->flags
.q
.varying
) {
3145 const char *i
= interpolation_string(interpolation
);
3147 if (qual
->flags
.q
.centroid
)
3148 s
= "centroid varying";
3152 _mesa_glsl_error(loc
, state
,
3153 "qualifier '%s' cannot be applied to the "
3154 "deprecated storage qualifier '%s'", i
, s
);
3157 validate_fragment_flat_interpolation_input(state
, loc
, interpolation
,
3161 static glsl_interp_mode
3162 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3163 const struct glsl_type
*var_type
,
3164 ir_variable_mode mode
,
3165 struct _mesa_glsl_parse_state
*state
,
3168 glsl_interp_mode interpolation
;
3169 if (qual
->flags
.q
.flat
)
3170 interpolation
= INTERP_MODE_FLAT
;
3171 else if (qual
->flags
.q
.noperspective
)
3172 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3173 else if (qual
->flags
.q
.smooth
)
3174 interpolation
= INTERP_MODE_SMOOTH
;
3176 interpolation
= INTERP_MODE_NONE
;
3178 validate_interpolation_qualifier(state
, loc
,
3180 qual
, var_type
, mode
);
3182 return interpolation
;
3187 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3189 struct _mesa_glsl_parse_state
*state
,
3194 unsigned qual_location
;
3195 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3200 /* Checks for GL_ARB_explicit_uniform_location. */
3201 if (qual
->flags
.q
.uniform
) {
3202 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3205 const struct gl_context
*const ctx
= state
->ctx
;
3206 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3208 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3209 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3210 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3211 ctx
->Const
.MaxUserAssignableUniformLocations
);
3215 var
->data
.explicit_location
= true;
3216 var
->data
.location
= qual_location
;
3220 /* Between GL_ARB_explicit_attrib_location an
3221 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3222 * stage can be assigned explicit locations. The checking here associates
3223 * the correct extension with the correct stage's input / output:
3227 * vertex explicit_loc sso
3228 * tess control sso sso
3231 * fragment sso explicit_loc
3233 switch (state
->stage
) {
3234 case MESA_SHADER_VERTEX
:
3235 if (var
->data
.mode
== ir_var_shader_in
) {
3236 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3242 if (var
->data
.mode
== ir_var_shader_out
) {
3243 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3252 case MESA_SHADER_TESS_CTRL
:
3253 case MESA_SHADER_TESS_EVAL
:
3254 case MESA_SHADER_GEOMETRY
:
3255 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3256 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3265 case MESA_SHADER_FRAGMENT
:
3266 if (var
->data
.mode
== ir_var_shader_in
) {
3267 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3273 if (var
->data
.mode
== ir_var_shader_out
) {
3274 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3283 case MESA_SHADER_COMPUTE
:
3284 _mesa_glsl_error(loc
, state
,
3285 "compute shader variables cannot be given "
3286 "explicit locations");
3294 _mesa_glsl_error(loc
, state
,
3295 "%s cannot be given an explicit location in %s shader",
3297 _mesa_shader_stage_to_string(state
->stage
));
3299 var
->data
.explicit_location
= true;
3301 switch (state
->stage
) {
3302 case MESA_SHADER_VERTEX
:
3303 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3304 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3305 : (qual_location
+ VARYING_SLOT_VAR0
);
3308 case MESA_SHADER_TESS_CTRL
:
3309 case MESA_SHADER_TESS_EVAL
:
3310 case MESA_SHADER_GEOMETRY
:
3311 if (var
->data
.patch
)
3312 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3314 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3317 case MESA_SHADER_FRAGMENT
:
3318 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3319 ? (qual_location
+ FRAG_RESULT_DATA0
)
3320 : (qual_location
+ VARYING_SLOT_VAR0
);
3323 assert(!"Unexpected shader type");
3327 /* Check if index was set for the uniform instead of the function */
3328 if (qual
->flags
.q
.explicit_index
&& qual
->is_subroutine_decl()) {
3329 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3330 "used with subroutine functions");
3334 unsigned qual_index
;
3335 if (qual
->flags
.q
.explicit_index
&&
3336 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3338 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3339 * Layout Qualifiers):
3341 * "It is also a compile-time error if a fragment shader
3342 * sets a layout index to less than 0 or greater than 1."
3344 * Older specifications don't mandate a behavior; we take
3345 * this as a clarification and always generate the error.
3347 if (qual_index
> 1) {
3348 _mesa_glsl_error(loc
, state
,
3349 "explicit index may only be 0 or 1");
3351 var
->data
.explicit_index
= true;
3352 var
->data
.index
= qual_index
;
3359 validate_storage_for_sampler_image_types(ir_variable
*var
,
3360 struct _mesa_glsl_parse_state
*state
,
3363 /* From section 4.1.7 of the GLSL 4.40 spec:
3365 * "[Opaque types] can only be declared as function
3366 * parameters or uniform-qualified variables."
3368 * From section 4.1.7 of the ARB_bindless_texture spec:
3370 * "Samplers may be declared as shader inputs and outputs, as uniform
3371 * variables, as temporary variables, and as function parameters."
3373 * From section 4.1.X of the ARB_bindless_texture spec:
3375 * "Images may be declared as shader inputs and outputs, as uniform
3376 * variables, as temporary variables, and as function parameters."
3378 if (state
->has_bindless()) {
3379 if (var
->data
.mode
!= ir_var_auto
&&
3380 var
->data
.mode
!= ir_var_uniform
&&
3381 var
->data
.mode
!= ir_var_shader_in
&&
3382 var
->data
.mode
!= ir_var_shader_out
&&
3383 var
->data
.mode
!= ir_var_function_in
&&
3384 var
->data
.mode
!= ir_var_function_out
&&
3385 var
->data
.mode
!= ir_var_function_inout
) {
3386 _mesa_glsl_error(loc
, state
, "bindless image/sampler variables may "
3387 "only be declared as shader inputs and outputs, as "
3388 "uniform variables, as temporary variables and as "
3389 "function parameters");
3393 if (var
->data
.mode
!= ir_var_uniform
&&
3394 var
->data
.mode
!= ir_var_function_in
) {
3395 _mesa_glsl_error(loc
, state
, "image/sampler variables may only be "
3396 "declared as function parameters or "
3397 "uniform-qualified global variables");
3405 validate_memory_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3407 const struct ast_type_qualifier
*qual
,
3408 const glsl_type
*type
)
3410 /* From Section 4.10 (Memory Qualifiers) of the GLSL 4.50 spec:
3412 * "Memory qualifiers are only supported in the declarations of image
3413 * variables, buffer variables, and shader storage blocks; it is an error
3414 * to use such qualifiers in any other declarations.
3416 if (!type
->is_image() && !qual
->flags
.q
.buffer
) {
3417 if (qual
->flags
.q
.read_only
||
3418 qual
->flags
.q
.write_only
||
3419 qual
->flags
.q
.coherent
||
3420 qual
->flags
.q
._volatile
||
3421 qual
->flags
.q
.restrict_flag
) {
3422 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied "
3423 "in the declarations of image variables, buffer "
3424 "variables, and shader storage blocks");
3432 validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3434 const struct ast_type_qualifier
*qual
,
3435 const glsl_type
*type
)
3437 /* From section 4.4.6.2 (Format Layout Qualifiers) of the GLSL 4.50 spec:
3439 * "Format layout qualifiers can be used on image variable declarations
3440 * (those declared with a basic type having “image ” in its keyword)."
3442 if (!type
->is_image() && qual
->flags
.q
.explicit_image_format
) {
3443 _mesa_glsl_error(loc
, state
, "format layout qualifiers may only be "
3444 "applied to images");
3451 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3453 struct _mesa_glsl_parse_state
*state
,
3456 const glsl_type
*base_type
= var
->type
->without_array();
3458 if (!validate_image_format_qualifier_for_type(state
, loc
, qual
, base_type
) ||
3459 !validate_memory_qualifier_for_type(state
, loc
, qual
, base_type
))
3462 if (!base_type
->is_image())
3465 if (!validate_storage_for_sampler_image_types(var
, state
, loc
))
3468 var
->data
.memory_read_only
|= qual
->flags
.q
.read_only
;
3469 var
->data
.memory_write_only
|= qual
->flags
.q
.write_only
;
3470 var
->data
.memory_coherent
|= qual
->flags
.q
.coherent
;
3471 var
->data
.memory_volatile
|= qual
->flags
.q
._volatile
;
3472 var
->data
.memory_restrict
|= qual
->flags
.q
.restrict_flag
;
3474 if (qual
->flags
.q
.explicit_image_format
) {
3475 if (var
->data
.mode
== ir_var_function_in
) {
3476 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be used on "
3477 "image function parameters");
3480 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3481 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the base "
3482 "data type of the image");
3485 var
->data
.image_format
= qual
->image_format
;
3486 } else if (state
->has_image_load_formatted()) {
3487 if (var
->data
.mode
== ir_var_uniform
&&
3488 state
->EXT_shader_image_load_formatted_warn
) {
3489 _mesa_glsl_warning(loc
, state
, "GL_EXT_image_load_formatted used");
3492 if (var
->data
.mode
== ir_var_uniform
) {
3493 if (state
->es_shader
||
3494 !(state
->is_version(420, 310) || state
->ARB_shader_image_load_store_enable
)) {
3495 _mesa_glsl_error(loc
, state
, "all image uniforms must have a "
3496 "format layout qualifier");
3497 } else if (!qual
->flags
.q
.write_only
) {
3498 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3499 "`writeonly' must have a format layout qualifier");
3502 var
->data
.image_format
= PIPE_FORMAT_NONE
;
3505 /* From page 70 of the GLSL ES 3.1 specification:
3507 * "Except for image variables qualified with the format qualifiers r32f,
3508 * r32i, and r32ui, image variables must specify either memory qualifier
3509 * readonly or the memory qualifier writeonly."
3511 if (state
->es_shader
&&
3512 var
->data
.image_format
!= PIPE_FORMAT_R32_FLOAT
&&
3513 var
->data
.image_format
!= PIPE_FORMAT_R32_SINT
&&
3514 var
->data
.image_format
!= PIPE_FORMAT_R32_UINT
&&
3515 !var
->data
.memory_read_only
&&
3516 !var
->data
.memory_write_only
) {
3517 _mesa_glsl_error(loc
, state
, "image variables of format other than r32f, "
3518 "r32i or r32ui must be qualified `readonly' or "
3523 static inline const char*
3524 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3526 if (origin_upper_left
&& pixel_center_integer
)
3527 return "origin_upper_left, pixel_center_integer";
3528 else if (origin_upper_left
)
3529 return "origin_upper_left";
3530 else if (pixel_center_integer
)
3531 return "pixel_center_integer";
3537 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3538 const struct ast_type_qualifier
*qual
)
3540 /* If gl_FragCoord was previously declared, and the qualifiers were
3541 * different in any way, return true.
3543 if (state
->fs_redeclares_gl_fragcoord
) {
3544 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3545 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3552 is_conflicting_layer_redeclaration(struct _mesa_glsl_parse_state
*state
,
3553 const struct ast_type_qualifier
*qual
)
3555 if (state
->redeclares_gl_layer
) {
3556 return state
->layer_viewport_relative
!= qual
->flags
.q
.viewport_relative
;
3562 validate_array_dimensions(const glsl_type
*t
,
3563 struct _mesa_glsl_parse_state
*state
,
3565 if (t
->is_array()) {
3566 t
= t
->fields
.array
;
3567 while (t
->is_array()) {
3568 if (t
->is_unsized_array()) {
3569 _mesa_glsl_error(loc
, state
,
3570 "only the outermost array dimension can "
3575 t
= t
->fields
.array
;
3581 apply_bindless_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3583 struct _mesa_glsl_parse_state
*state
,
3586 bool has_local_qualifiers
= qual
->flags
.q
.bindless_sampler
||
3587 qual
->flags
.q
.bindless_image
||
3588 qual
->flags
.q
.bound_sampler
||
3589 qual
->flags
.q
.bound_image
;
3591 /* The ARB_bindless_texture spec says:
3593 * "Modify Section 4.4.6 Opaque-Uniform Layout Qualifiers of the GLSL 4.30
3596 * "If these layout qualifiers are applied to other types of default block
3597 * uniforms, or variables with non-uniform storage, a compile-time error
3598 * will be generated."
3600 if (has_local_qualifiers
&& !qual
->flags
.q
.uniform
) {
3601 _mesa_glsl_error(loc
, state
, "ARB_bindless_texture layout qualifiers "
3602 "can only be applied to default block uniforms or "
3603 "variables with uniform storage");
3607 /* The ARB_bindless_texture spec doesn't state anything in this situation,
3608 * but it makes sense to only allow bindless_sampler/bound_sampler for
3609 * sampler types, and respectively bindless_image/bound_image for image
3612 if ((qual
->flags
.q
.bindless_sampler
|| qual
->flags
.q
.bound_sampler
) &&
3613 !var
->type
->contains_sampler()) {
3614 _mesa_glsl_error(loc
, state
, "bindless_sampler or bound_sampler can only "
3615 "be applied to sampler types");
3619 if ((qual
->flags
.q
.bindless_image
|| qual
->flags
.q
.bound_image
) &&
3620 !var
->type
->contains_image()) {
3621 _mesa_glsl_error(loc
, state
, "bindless_image or bound_image can only be "
3622 "applied to image types");
3626 /* The bindless_sampler/bindless_image (and respectively
3627 * bound_sampler/bound_image) layout qualifiers can be set at global and at
3630 if (var
->type
->contains_sampler() || var
->type
->contains_image()) {
3631 var
->data
.bindless
= qual
->flags
.q
.bindless_sampler
||
3632 qual
->flags
.q
.bindless_image
||
3633 state
->bindless_sampler_specified
||
3634 state
->bindless_image_specified
;
3636 var
->data
.bound
= qual
->flags
.q
.bound_sampler
||
3637 qual
->flags
.q
.bound_image
||
3638 state
->bound_sampler_specified
||
3639 state
->bound_image_specified
;
3644 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3646 struct _mesa_glsl_parse_state
*state
,
3649 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3651 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3653 * "Within any shader, the first redeclarations of gl_FragCoord
3654 * must appear before any use of gl_FragCoord."
3656 * Generate a compiler error if above condition is not met by the
3659 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3660 if (earlier
!= NULL
&&
3661 earlier
->data
.used
&&
3662 !state
->fs_redeclares_gl_fragcoord
) {
3663 _mesa_glsl_error(loc
, state
,
3664 "gl_FragCoord used before its first redeclaration "
3665 "in fragment shader");
3668 /* Make sure all gl_FragCoord redeclarations specify the same layout
3671 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3672 const char *const qual_string
=
3673 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3674 qual
->flags
.q
.pixel_center_integer
);
3676 const char *const state_string
=
3677 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3678 state
->fs_pixel_center_integer
);
3680 _mesa_glsl_error(loc
, state
,
3681 "gl_FragCoord redeclared with different layout "
3682 "qualifiers (%s) and (%s) ",
3686 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3687 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3688 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3689 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3690 state
->fs_redeclares_gl_fragcoord
=
3691 state
->fs_origin_upper_left
||
3692 state
->fs_pixel_center_integer
||
3693 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3696 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3697 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3698 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3699 ? "origin_upper_left" : "pixel_center_integer";
3701 _mesa_glsl_error(loc
, state
,
3702 "layout qualifier `%s' can only be applied to "
3703 "fragment shader input `gl_FragCoord'",
3707 if (qual
->flags
.q
.explicit_location
) {
3708 apply_explicit_location(qual
, var
, state
, loc
);
3710 if (qual
->flags
.q
.explicit_component
) {
3711 unsigned qual_component
;
3712 if (process_qualifier_constant(state
, loc
, "component",
3713 qual
->component
, &qual_component
)) {
3714 const glsl_type
*type
= var
->type
->without_array();
3715 unsigned components
= type
->component_slots();
3717 if (type
->is_matrix() || type
->is_struct()) {
3718 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3719 "cannot be applied to a matrix, a structure, "
3720 "a block, or an array containing any of "
3722 } else if (components
> 4 && type
->is_64bit()) {
3723 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3724 "cannot be applied to dvec%u.",
3726 } else if (qual_component
!= 0 &&
3727 (qual_component
+ components
- 1) > 3) {
3728 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3729 (qual_component
+ components
- 1));
3730 } else if (qual_component
== 1 && type
->is_64bit()) {
3731 /* We don't bother checking for 3 as it should be caught by the
3732 * overflow check above.
3734 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3735 "component 1 or 3");
3737 var
->data
.explicit_component
= true;
3738 var
->data
.location_frac
= qual_component
;
3742 } else if (qual
->flags
.q
.explicit_index
) {
3743 if (!qual
->subroutine_list
)
3744 _mesa_glsl_error(loc
, state
,
3745 "explicit index requires explicit location");
3746 } else if (qual
->flags
.q
.explicit_component
) {
3747 _mesa_glsl_error(loc
, state
,
3748 "explicit component requires explicit location");
3751 if (qual
->flags
.q
.explicit_binding
) {
3752 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3755 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3756 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3757 unsigned qual_stream
;
3758 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3760 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3761 var
->data
.stream
= qual_stream
;
3765 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3766 unsigned qual_xfb_buffer
;
3767 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3768 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3769 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3770 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3771 if (qual
->flags
.q
.explicit_xfb_buffer
)
3772 var
->data
.explicit_xfb_buffer
= true;
3776 if (qual
->flags
.q
.explicit_xfb_offset
) {
3777 unsigned qual_xfb_offset
;
3778 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3780 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3781 qual
->offset
, &qual_xfb_offset
) &&
3782 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3783 var
->type
, component_size
)) {
3784 var
->data
.offset
= qual_xfb_offset
;
3785 var
->data
.explicit_xfb_offset
= true;
3789 if (qual
->flags
.q
.explicit_xfb_stride
) {
3790 unsigned qual_xfb_stride
;
3791 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3792 qual
->xfb_stride
, &qual_xfb_stride
)) {
3793 var
->data
.xfb_stride
= qual_xfb_stride
;
3794 var
->data
.explicit_xfb_stride
= true;
3798 if (var
->type
->contains_atomic()) {
3799 if (var
->data
.mode
== ir_var_uniform
) {
3800 if (var
->data
.explicit_binding
) {
3802 &state
->atomic_counter_offsets
[var
->data
.binding
];
3804 if (*offset
% ATOMIC_COUNTER_SIZE
)
3805 _mesa_glsl_error(loc
, state
,
3806 "misaligned atomic counter offset");
3808 var
->data
.offset
= *offset
;
3809 *offset
+= var
->type
->atomic_size();
3812 _mesa_glsl_error(loc
, state
,
3813 "atomic counters require explicit binding point");
3815 } else if (var
->data
.mode
!= ir_var_function_in
) {
3816 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3817 "function parameters or uniform-qualified "
3818 "global variables");
3822 if (var
->type
->contains_sampler() &&
3823 !validate_storage_for_sampler_image_types(var
, state
, loc
))
3826 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3827 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3828 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3829 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3830 * These extensions and all following extensions that add the 'layout'
3831 * keyword have been modified to require the use of 'in' or 'out'.
3833 * The following extension do not allow the deprecated keywords:
3835 * GL_AMD_conservative_depth
3836 * GL_ARB_conservative_depth
3837 * GL_ARB_gpu_shader5
3838 * GL_ARB_separate_shader_objects
3839 * GL_ARB_tessellation_shader
3840 * GL_ARB_transform_feedback3
3841 * GL_ARB_uniform_buffer_object
3843 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3844 * allow layout with the deprecated keywords.
3846 const bool relaxed_layout_qualifier_checking
=
3847 state
->ARB_fragment_coord_conventions_enable
;
3849 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3850 || qual
->flags
.q
.varying
;
3851 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3852 if (relaxed_layout_qualifier_checking
) {
3853 _mesa_glsl_warning(loc
, state
,
3854 "`layout' qualifier may not be used with "
3855 "`attribute' or `varying'");
3857 _mesa_glsl_error(loc
, state
,
3858 "`layout' qualifier may not be used with "
3859 "`attribute' or `varying'");
3863 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3864 * AMD_conservative_depth.
3866 if (qual
->flags
.q
.depth_type
3867 && !state
->is_version(420, 0)
3868 && !state
->AMD_conservative_depth_enable
3869 && !state
->ARB_conservative_depth_enable
) {
3870 _mesa_glsl_error(loc
, state
,
3871 "extension GL_AMD_conservative_depth or "
3872 "GL_ARB_conservative_depth must be enabled "
3873 "to use depth layout qualifiers");
3874 } else if (qual
->flags
.q
.depth_type
3875 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3876 _mesa_glsl_error(loc
, state
,
3877 "depth layout qualifiers can be applied only to "
3881 switch (qual
->depth_type
) {
3883 var
->data
.depth_layout
= ir_depth_layout_any
;
3885 case ast_depth_greater
:
3886 var
->data
.depth_layout
= ir_depth_layout_greater
;
3888 case ast_depth_less
:
3889 var
->data
.depth_layout
= ir_depth_layout_less
;
3891 case ast_depth_unchanged
:
3892 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3895 var
->data
.depth_layout
= ir_depth_layout_none
;
3899 if (qual
->flags
.q
.std140
||
3900 qual
->flags
.q
.std430
||
3901 qual
->flags
.q
.packed
||
3902 qual
->flags
.q
.shared
) {
3903 _mesa_glsl_error(loc
, state
,
3904 "uniform and shader storage block layout qualifiers "
3905 "std140, std430, packed, and shared can only be "
3906 "applied to uniform or shader storage blocks, not "
3910 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3911 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3914 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3917 * "Fragment shaders also allow the following layout qualifier on in only
3918 * (not with variable declarations)
3919 * layout-qualifier-id
3920 * early_fragment_tests
3923 if (qual
->flags
.q
.early_fragment_tests
) {
3924 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3925 "valid in fragment shader input layout declaration.");
3928 if (qual
->flags
.q
.inner_coverage
) {
3929 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3930 "valid in fragment shader input layout declaration.");
3933 if (qual
->flags
.q
.post_depth_coverage
) {
3934 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3935 "valid in fragment shader input layout declaration.");
3938 if (state
->has_bindless())
3939 apply_bindless_qualifier_to_variable(qual
, var
, state
, loc
);
3941 if (qual
->flags
.q
.pixel_interlock_ordered
||
3942 qual
->flags
.q
.pixel_interlock_unordered
||
3943 qual
->flags
.q
.sample_interlock_ordered
||
3944 qual
->flags
.q
.sample_interlock_unordered
) {
3945 _mesa_glsl_error(loc
, state
, "interlock layout qualifiers: "
3946 "pixel_interlock_ordered, pixel_interlock_unordered, "
3947 "sample_interlock_ordered and sample_interlock_unordered, "
3948 "only valid in fragment shader input layout declaration.");
3951 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_Layer") == 0) {
3952 if (is_conflicting_layer_redeclaration(state
, qual
)) {
3953 _mesa_glsl_error(loc
, state
, "gl_Layer redeclaration with "
3954 "different viewport_relative setting than earlier");
3956 state
->redeclares_gl_layer
= 1;
3957 if (qual
->flags
.q
.viewport_relative
) {
3958 state
->layer_viewport_relative
= 1;
3960 } else if (qual
->flags
.q
.viewport_relative
) {
3961 _mesa_glsl_error(loc
, state
,
3962 "viewport_relative qualifier "
3963 "can only be applied to gl_Layer.");
3968 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3970 struct _mesa_glsl_parse_state
*state
,
3974 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3976 if (qual
->flags
.q
.invariant
) {
3977 if (var
->data
.used
) {
3978 _mesa_glsl_error(loc
, state
,
3979 "variable `%s' may not be redeclared "
3980 "`invariant' after being used",
3983 var
->data
.explicit_invariant
= true;
3984 var
->data
.invariant
= true;
3988 if (qual
->flags
.q
.precise
) {
3989 if (var
->data
.used
) {
3990 _mesa_glsl_error(loc
, state
,
3991 "variable `%s' may not be redeclared "
3992 "`precise' after being used",
3995 var
->data
.precise
= 1;
3999 if (qual
->is_subroutine_decl() && !qual
->flags
.q
.uniform
) {
4000 _mesa_glsl_error(loc
, state
,
4001 "`subroutine' may only be applied to uniforms, "
4002 "subroutine type declarations, or function definitions");
4005 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
4006 || qual
->flags
.q
.uniform
4007 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
4008 var
->data
.read_only
= 1;
4010 if (qual
->flags
.q
.centroid
)
4011 var
->data
.centroid
= 1;
4013 if (qual
->flags
.q
.sample
)
4014 var
->data
.sample
= 1;
4016 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
4017 if (state
->es_shader
) {
4018 var
->data
.precision
=
4019 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
4022 if (qual
->flags
.q
.patch
)
4023 var
->data
.patch
= 1;
4025 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
4026 var
->type
= glsl_type::error_type
;
4027 _mesa_glsl_error(loc
, state
,
4028 "`attribute' variables may not be declared in the "
4030 _mesa_shader_stage_to_string(state
->stage
));
4033 /* Disallow layout qualifiers which may only appear on layout declarations. */
4034 if (qual
->flags
.q
.prim_type
) {
4035 _mesa_glsl_error(loc
, state
,
4036 "Primitive type may only be specified on GS input or output "
4037 "layout declaration, not on variables.");
4040 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
4042 * "However, the const qualifier cannot be used with out or inout."
4044 * The same section of the GLSL 4.40 spec further clarifies this saying:
4046 * "The const qualifier cannot be used with out or inout, or a
4047 * compile-time error results."
4049 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
4050 _mesa_glsl_error(loc
, state
,
4051 "`const' may not be applied to `out' or `inout' "
4052 "function parameters");
4055 /* If there is no qualifier that changes the mode of the variable, leave
4056 * the setting alone.
4058 assert(var
->data
.mode
!= ir_var_temporary
);
4059 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
4060 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
4061 else if (qual
->flags
.q
.in
)
4062 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
4063 else if (qual
->flags
.q
.attribute
4064 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
4065 var
->data
.mode
= ir_var_shader_in
;
4066 else if (qual
->flags
.q
.out
)
4067 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
4068 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
4069 var
->data
.mode
= ir_var_shader_out
;
4070 else if (qual
->flags
.q
.uniform
)
4071 var
->data
.mode
= ir_var_uniform
;
4072 else if (qual
->flags
.q
.buffer
)
4073 var
->data
.mode
= ir_var_shader_storage
;
4074 else if (qual
->flags
.q
.shared_storage
)
4075 var
->data
.mode
= ir_var_shader_shared
;
4077 if (!is_parameter
&& state
->has_framebuffer_fetch() &&
4078 state
->stage
== MESA_SHADER_FRAGMENT
) {
4079 if (state
->is_version(130, 300))
4080 var
->data
.fb_fetch_output
= qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
4082 var
->data
.fb_fetch_output
= (strcmp(var
->name
, "gl_LastFragData") == 0);
4085 if (var
->data
.fb_fetch_output
) {
4086 var
->data
.assigned
= true;
4087 var
->data
.memory_coherent
= !qual
->flags
.q
.non_coherent
;
4089 /* From the EXT_shader_framebuffer_fetch spec:
4091 * "It is an error to declare an inout fragment output not qualified
4092 * with layout(noncoherent) if the GL_EXT_shader_framebuffer_fetch
4093 * extension hasn't been enabled."
4095 if (var
->data
.memory_coherent
&&
4096 !state
->EXT_shader_framebuffer_fetch_enable
)
4097 _mesa_glsl_error(loc
, state
,
4098 "invalid declaration of framebuffer fetch output not "
4099 "qualified with layout(noncoherent)");
4102 /* From the EXT_shader_framebuffer_fetch spec:
4104 * "Fragment outputs declared inout may specify the following layout
4105 * qualifier: [...] noncoherent"
4107 if (qual
->flags
.q
.non_coherent
)
4108 _mesa_glsl_error(loc
, state
,
4109 "invalid layout(noncoherent) qualifier not part of "
4110 "framebuffer fetch output declaration");
4113 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
4114 /* User-defined ins/outs are not permitted in compute shaders. */
4115 if (state
->stage
== MESA_SHADER_COMPUTE
) {
4116 _mesa_glsl_error(loc
, state
,
4117 "user-defined input and output variables are not "
4118 "permitted in compute shaders");
4121 /* This variable is being used to link data between shader stages (in
4122 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
4123 * that is allowed for such purposes.
4125 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
4127 * "The varying qualifier can be used only with the data types
4128 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
4131 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
4132 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
4134 * "Fragment inputs can only be signed and unsigned integers and
4135 * integer vectors, float, floating-point vectors, matrices, or
4136 * arrays of these. Structures cannot be input.
4138 * Similar text exists in the section on vertex shader outputs.
4140 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
4141 * 3.00 spec allows structs as well. Varying structs are also allowed
4144 * From section 4.3.4 of the ARB_bindless_texture spec:
4146 * "(modify third paragraph of the section to allow sampler and image
4147 * types) ... Vertex shader inputs can only be float,
4148 * single-precision floating-point scalars, single-precision
4149 * floating-point vectors, matrices, signed and unsigned integers
4150 * and integer vectors, sampler and image types."
4152 * From section 4.3.6 of the ARB_bindless_texture spec:
4154 * "Output variables can only be floating-point scalars,
4155 * floating-point vectors, matrices, signed or unsigned integers or
4156 * integer vectors, sampler or image types, or arrays or structures
4159 switch (var
->type
->without_array()->base_type
) {
4160 case GLSL_TYPE_FLOAT
:
4161 /* Ok in all GLSL versions */
4163 case GLSL_TYPE_UINT
:
4165 if (state
->is_version(130, 300) || state
->EXT_gpu_shader4_enable
)
4167 _mesa_glsl_error(loc
, state
,
4168 "varying variables must be of base type float in %s",
4169 state
->get_version_string());
4171 case GLSL_TYPE_STRUCT
:
4172 if (state
->is_version(150, 300))
4174 _mesa_glsl_error(loc
, state
,
4175 "varying variables may not be of type struct");
4177 case GLSL_TYPE_DOUBLE
:
4178 case GLSL_TYPE_UINT64
:
4179 case GLSL_TYPE_INT64
:
4181 case GLSL_TYPE_SAMPLER
:
4182 case GLSL_TYPE_IMAGE
:
4183 if (state
->has_bindless())
4187 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
4192 if (state
->all_invariant
&& var
->data
.mode
== ir_var_shader_out
) {
4193 var
->data
.explicit_invariant
= true;
4194 var
->data
.invariant
= true;
4197 var
->data
.interpolation
=
4198 interpret_interpolation_qualifier(qual
, var
->type
,
4199 (ir_variable_mode
) var
->data
.mode
,
4202 /* Does the declaration use the deprecated 'attribute' or 'varying'
4205 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
4206 || qual
->flags
.q
.varying
;
4209 /* Validate auxiliary storage qualifiers */
4211 /* From section 4.3.4 of the GLSL 1.30 spec:
4212 * "It is an error to use centroid in in a vertex shader."
4214 * From section 4.3.4 of the GLSL ES 3.00 spec:
4215 * "It is an error to use centroid in or interpolation qualifiers in
4216 * a vertex shader input."
4219 /* Section 4.3.6 of the GLSL 1.30 specification states:
4220 * "It is an error to use centroid out in a fragment shader."
4222 * The GL_ARB_shading_language_420pack extension specification states:
4223 * "It is an error to use auxiliary storage qualifiers or interpolation
4224 * qualifiers on an output in a fragment shader."
4226 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
4227 _mesa_glsl_error(loc
, state
,
4228 "sample qualifier may only be used on `in` or `out` "
4229 "variables between shader stages");
4231 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
4232 _mesa_glsl_error(loc
, state
,
4233 "centroid qualifier may only be used with `in', "
4234 "`out' or `varying' variables between shader stages");
4237 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
4238 _mesa_glsl_error(loc
, state
,
4239 "the shared storage qualifiers can only be used with "
4243 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
4247 * Get the variable that is being redeclared by this declaration or if it
4248 * does not exist, the current declared variable.
4250 * Semantic checks to verify the validity of the redeclaration are also
4251 * performed. If semantic checks fail, compilation error will be emitted via
4252 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
4255 * A pointer to an existing variable in the current scope if the declaration
4256 * is a redeclaration, current variable otherwise. \c is_declared boolean
4257 * will return \c true if the declaration is a redeclaration, \c false
4260 static ir_variable
*
4261 get_variable_being_redeclared(ir_variable
**var_ptr
, YYLTYPE loc
,
4262 struct _mesa_glsl_parse_state
*state
,
4263 bool allow_all_redeclarations
,
4264 bool *is_redeclaration
)
4266 ir_variable
*var
= *var_ptr
;
4268 /* Check if this declaration is actually a re-declaration, either to
4269 * resize an array or add qualifiers to an existing variable.
4271 * This is allowed for variables in the current scope, or when at
4272 * global scope (for built-ins in the implicit outer scope).
4274 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
4275 if (earlier
== NULL
||
4276 (state
->current_function
!= NULL
&&
4277 !state
->symbols
->name_declared_this_scope(var
->name
))) {
4278 *is_redeclaration
= false;
4282 *is_redeclaration
= true;
4284 if (earlier
->data
.how_declared
== ir_var_declared_implicitly
) {
4285 /* Verify that the redeclaration of a built-in does not change the
4286 * storage qualifier. There are a couple special cases.
4288 * 1. Some built-in variables that are defined as 'in' in the
4289 * specification are implemented as system values. Allow
4290 * ir_var_system_value -> ir_var_shader_in.
4292 * 2. gl_LastFragData is implemented as a ir_var_shader_out, but the
4293 * specification requires that redeclarations omit any qualifier.
4294 * Allow ir_var_shader_out -> ir_var_auto for this one variable.
4296 if (earlier
->data
.mode
!= var
->data
.mode
&&
4297 !(earlier
->data
.mode
== ir_var_system_value
&&
4298 var
->data
.mode
== ir_var_shader_in
) &&
4299 !(strcmp(var
->name
, "gl_LastFragData") == 0 &&
4300 var
->data
.mode
== ir_var_auto
)) {
4301 _mesa_glsl_error(&loc
, state
,
4302 "redeclaration cannot change qualification of `%s'",
4307 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4309 * "It is legal to declare an array without a size and then
4310 * later re-declare the same name as an array of the same
4311 * type and specify a size."
4313 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4314 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4315 const int size
= var
->type
->array_size();
4316 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4317 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4318 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4320 earlier
->data
.max_array_access
);
4323 earlier
->type
= var
->type
;
4327 } else if (earlier
->type
!= var
->type
) {
4328 _mesa_glsl_error(&loc
, state
,
4329 "redeclaration of `%s' has incorrect type",
4331 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4332 state
->is_version(150, 0))
4333 && strcmp(var
->name
, "gl_FragCoord") == 0) {
4334 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4337 * We don't really need to do anything here, just allow the
4338 * redeclaration. Any error on the gl_FragCoord is handled on the ast
4339 * level at apply_layout_qualifier_to_variable using the
4340 * ast_type_qualifier and _mesa_glsl_parse_state, or later at
4343 /* According to section 4.3.7 of the GLSL 1.30 spec,
4344 * the following built-in varaibles can be redeclared with an
4345 * interpolation qualifier:
4348 * * gl_FrontSecondaryColor
4349 * * gl_BackSecondaryColor
4351 * * gl_SecondaryColor
4353 } else if (state
->is_version(130, 0)
4354 && (strcmp(var
->name
, "gl_FrontColor") == 0
4355 || strcmp(var
->name
, "gl_BackColor") == 0
4356 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4357 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4358 || strcmp(var
->name
, "gl_Color") == 0
4359 || strcmp(var
->name
, "gl_SecondaryColor") == 0)) {
4360 earlier
->data
.interpolation
= var
->data
.interpolation
;
4362 /* Layout qualifiers for gl_FragDepth. */
4363 } else if ((state
->is_version(420, 0) ||
4364 state
->AMD_conservative_depth_enable
||
4365 state
->ARB_conservative_depth_enable
)
4366 && strcmp(var
->name
, "gl_FragDepth") == 0) {
4368 /** From the AMD_conservative_depth spec:
4369 * Within any shader, the first redeclarations of gl_FragDepth
4370 * must appear before any use of gl_FragDepth.
4372 if (earlier
->data
.used
) {
4373 _mesa_glsl_error(&loc
, state
,
4374 "the first redeclaration of gl_FragDepth "
4375 "must appear before any use of gl_FragDepth");
4378 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4379 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4380 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4381 _mesa_glsl_error(&loc
, state
,
4382 "gl_FragDepth: depth layout is declared here "
4383 "as '%s, but it was previously declared as "
4385 depth_layout_string(var
->data
.depth_layout
),
4386 depth_layout_string(earlier
->data
.depth_layout
));
4389 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4391 } else if (state
->has_framebuffer_fetch() &&
4392 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4393 var
->data
.mode
== ir_var_auto
) {
4394 /* According to the EXT_shader_framebuffer_fetch spec:
4396 * "By default, gl_LastFragData is declared with the mediump precision
4397 * qualifier. This can be changed by redeclaring the corresponding
4398 * variables with the desired precision qualifier."
4400 * "Fragment shaders may specify the following layout qualifier only for
4401 * redeclaring the built-in gl_LastFragData array [...]: noncoherent"
4403 earlier
->data
.precision
= var
->data
.precision
;
4404 earlier
->data
.memory_coherent
= var
->data
.memory_coherent
;
4406 } else if (state
->NV_viewport_array2_enable
&&
4407 strcmp(var
->name
, "gl_Layer") == 0 &&
4408 earlier
->data
.how_declared
== ir_var_declared_implicitly
) {
4409 /* No need to do anything, just allow it. Qualifier is stored in state */
4411 } else if ((earlier
->data
.how_declared
== ir_var_declared_implicitly
&&
4412 state
->allow_builtin_variable_redeclaration
) ||
4413 allow_all_redeclarations
) {
4414 /* Allow verbatim redeclarations of built-in variables. Not explicitly
4415 * valid, but some applications do it.
4418 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4425 * Generate the IR for an initializer in a variable declaration
4428 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4429 ast_fully_specified_type
*type
,
4430 exec_list
*initializer_instructions
,
4431 struct _mesa_glsl_parse_state
*state
)
4433 void *mem_ctx
= state
;
4434 ir_rvalue
*result
= NULL
;
4436 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4438 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4440 * "All uniform variables are read-only and are initialized either
4441 * directly by an application via API commands, or indirectly by
4444 if (var
->data
.mode
== ir_var_uniform
) {
4445 state
->check_version(120, 0, &initializer_loc
,
4446 "cannot initialize uniform %s",
4450 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4452 * "Buffer variables cannot have initializers."
4454 if (var
->data
.mode
== ir_var_shader_storage
) {
4455 _mesa_glsl_error(&initializer_loc
, state
,
4456 "cannot initialize buffer variable %s",
4460 /* From section 4.1.7 of the GLSL 4.40 spec:
4462 * "Opaque variables [...] are initialized only through the
4463 * OpenGL API; they cannot be declared with an initializer in a
4466 * From section 4.1.7 of the ARB_bindless_texture spec:
4468 * "Samplers may be declared as shader inputs and outputs, as uniform
4469 * variables, as temporary variables, and as function parameters."
4471 * From section 4.1.X of the ARB_bindless_texture spec:
4473 * "Images may be declared as shader inputs and outputs, as uniform
4474 * variables, as temporary variables, and as function parameters."
4476 if (var
->type
->contains_atomic() ||
4477 (!state
->has_bindless() && var
->type
->contains_opaque())) {
4478 _mesa_glsl_error(&initializer_loc
, state
,
4479 "cannot initialize %s variable %s",
4480 var
->name
, state
->has_bindless() ? "atomic" : "opaque");
4483 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4484 _mesa_glsl_error(&initializer_loc
, state
,
4485 "cannot initialize %s shader input / %s %s",
4486 _mesa_shader_stage_to_string(state
->stage
),
4487 (state
->stage
== MESA_SHADER_VERTEX
)
4488 ? "attribute" : "varying",
4492 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4493 _mesa_glsl_error(&initializer_loc
, state
,
4494 "cannot initialize %s shader output %s",
4495 _mesa_shader_stage_to_string(state
->stage
),
4499 /* If the initializer is an ast_aggregate_initializer, recursively store
4500 * type information from the LHS into it, so that its hir() function can do
4503 if (decl
->initializer
->oper
== ast_aggregate
)
4504 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4506 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4507 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4509 /* Calculate the constant value if this is a const or uniform
4512 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4514 * "Declarations of globals without a storage qualifier, or with
4515 * just the const qualifier, may include initializers, in which case
4516 * they will be initialized before the first line of main() is
4517 * executed. Such initializers must be a constant expression."
4519 * The same section of the GLSL ES 3.00.4 spec has similar language.
4521 if (type
->qualifier
.flags
.q
.constant
4522 || type
->qualifier
.flags
.q
.uniform
4523 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4524 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4526 if (new_rhs
!= NULL
) {
4529 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4532 * "A constant expression is one of
4536 * - an expression formed by an operator on operands that are
4537 * all constant expressions, including getting an element of
4538 * a constant array, or a field of a constant structure, or
4539 * components of a constant vector. However, the sequence
4540 * operator ( , ) and the assignment operators ( =, +=, ...)
4541 * are not included in the operators that can create a
4542 * constant expression."
4544 * Section 12.43 (Sequence operator and constant expressions) says:
4546 * "Should the following construct be allowed?
4550 * The expression within the brackets uses the sequence operator
4551 * (',') and returns the integer 3 so the construct is declaring
4552 * a single-dimensional array of size 3. In some languages, the
4553 * construct declares a two-dimensional array. It would be
4554 * preferable to make this construct illegal to avoid confusion.
4556 * One possibility is to change the definition of the sequence
4557 * operator so that it does not return a constant-expression and
4558 * hence cannot be used to declare an array size.
4560 * RESOLUTION: The result of a sequence operator is not a
4561 * constant-expression."
4563 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4564 * contains language almost identical to the section 4.3.3 in the
4565 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4568 ir_constant
*constant_value
=
4569 rhs
->constant_expression_value(mem_ctx
);
4571 if (!constant_value
||
4572 (state
->is_version(430, 300) &&
4573 decl
->initializer
->has_sequence_subexpression())) {
4574 const char *const variable_mode
=
4575 (type
->qualifier
.flags
.q
.constant
)
4577 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4579 /* If ARB_shading_language_420pack is enabled, initializers of
4580 * const-qualified local variables do not have to be constant
4581 * expressions. Const-qualified global variables must still be
4582 * initialized with constant expressions.
4584 if (!state
->has_420pack()
4585 || state
->current_function
== NULL
) {
4586 _mesa_glsl_error(& initializer_loc
, state
,
4587 "initializer of %s variable `%s' must be a "
4588 "constant expression",
4591 if (var
->type
->is_numeric()) {
4592 /* Reduce cascading errors. */
4593 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4594 ? ir_constant::zero(state
, var
->type
) : NULL
;
4598 rhs
= constant_value
;
4599 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4600 ? constant_value
: NULL
;
4603 if (var
->type
->is_numeric()) {
4604 /* Reduce cascading errors. */
4605 rhs
= var
->constant_value
= type
->qualifier
.flags
.q
.constant
4606 ? ir_constant::zero(state
, var
->type
) : NULL
;
4611 if (rhs
&& !rhs
->type
->is_error()) {
4612 bool temp
= var
->data
.read_only
;
4613 if (type
->qualifier
.flags
.q
.constant
)
4614 var
->data
.read_only
= false;
4616 /* Never emit code to initialize a uniform.
4618 const glsl_type
*initializer_type
;
4619 bool error_emitted
= false;
4620 if (!type
->qualifier
.flags
.q
.uniform
) {
4622 do_assignment(initializer_instructions
, state
,
4624 &result
, true, true,
4625 type
->get_location());
4626 initializer_type
= result
->type
;
4628 initializer_type
= rhs
->type
;
4630 if (!error_emitted
) {
4631 var
->constant_initializer
= rhs
->constant_expression_value(mem_ctx
);
4632 var
->data
.has_initializer
= true;
4633 var
->data
.is_implicit_initializer
= false;
4635 /* If the declared variable is an unsized array, it must inherrit
4636 * its full type from the initializer. A declaration such as
4638 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4642 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4644 * The assignment generated in the if-statement (below) will also
4645 * automatically handle this case for non-uniforms.
4647 * If the declared variable is not an array, the types must
4648 * already match exactly. As a result, the type assignment
4649 * here can be done unconditionally. For non-uniforms the call
4650 * to do_assignment can change the type of the initializer (via
4651 * the implicit conversion rules). For uniforms the initializer
4652 * must be a constant expression, and the type of that expression
4653 * was validated above.
4655 var
->type
= initializer_type
;
4658 var
->data
.read_only
= temp
;
4665 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4666 YYLTYPE loc
, ir_variable
*var
,
4667 unsigned num_vertices
,
4669 const char *var_category
)
4671 if (var
->type
->is_unsized_array()) {
4672 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4674 * All geometry shader input unsized array declarations will be
4675 * sized by an earlier input layout qualifier, when present, as per
4676 * the following table.
4678 * Followed by a table mapping each allowed input layout qualifier to
4679 * the corresponding input length.
4681 * Similarly for tessellation control shader outputs.
4683 if (num_vertices
!= 0)
4684 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4687 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4688 * includes the following examples of compile-time errors:
4690 * // code sequence within one shader...
4691 * in vec4 Color1[]; // size unknown
4692 * ...Color1.length()...// illegal, length() unknown
4693 * in vec4 Color2[2]; // size is 2
4694 * ...Color1.length()...// illegal, Color1 still has no size
4695 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4696 * layout(lines) in; // legal, input size is 2, matching
4697 * in vec4 Color4[3]; // illegal, contradicts layout
4700 * To detect the case illustrated by Color3, we verify that the size of
4701 * an explicitly-sized array matches the size of any previously declared
4702 * explicitly-sized array. To detect the case illustrated by Color4, we
4703 * verify that the size of an explicitly-sized array is consistent with
4704 * any previously declared input layout.
4706 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4707 _mesa_glsl_error(&loc
, state
,
4708 "%s size contradicts previously declared layout "
4709 "(size is %u, but layout requires a size of %u)",
4710 var_category
, var
->type
->length
, num_vertices
);
4711 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4712 _mesa_glsl_error(&loc
, state
,
4713 "%s sizes are inconsistent (size is %u, but a "
4714 "previous declaration has size %u)",
4715 var_category
, var
->type
->length
, *size
);
4717 *size
= var
->type
->length
;
4723 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4724 YYLTYPE loc
, ir_variable
*var
)
4726 unsigned num_vertices
= 0;
4728 if (state
->tcs_output_vertices_specified
) {
4729 if (!state
->out_qualifier
->vertices
->
4730 process_qualifier_constant(state
, "vertices",
4731 &num_vertices
, false)) {
4735 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4736 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4737 "GL_MAX_PATCH_VERTICES", num_vertices
);
4742 if (!var
->type
->is_array() && !var
->data
.patch
) {
4743 _mesa_glsl_error(&loc
, state
,
4744 "tessellation control shader outputs must be arrays");
4746 /* To avoid cascading failures, short circuit the checks below. */
4750 if (var
->data
.patch
)
4753 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4754 &state
->tcs_output_size
,
4755 "tessellation control shader output");
4759 * Do additional processing necessary for tessellation control/evaluation shader
4760 * input declarations. This covers both interface block arrays and bare input
4764 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4765 YYLTYPE loc
, ir_variable
*var
)
4767 if (!var
->type
->is_array() && !var
->data
.patch
) {
4768 _mesa_glsl_error(&loc
, state
,
4769 "per-vertex tessellation shader inputs must be arrays");
4770 /* Avoid cascading failures. */
4774 if (var
->data
.patch
)
4777 /* The ARB_tessellation_shader spec says:
4779 * "Declaring an array size is optional. If no size is specified, it
4780 * will be taken from the implementation-dependent maximum patch size
4781 * (gl_MaxPatchVertices). If a size is specified, it must match the
4782 * maximum patch size; otherwise, a compile or link error will occur."
4784 * This text appears twice, once for TCS inputs, and again for TES inputs.
4786 if (var
->type
->is_unsized_array()) {
4787 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4788 state
->Const
.MaxPatchVertices
);
4789 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4790 _mesa_glsl_error(&loc
, state
,
4791 "per-vertex tessellation shader input arrays must be "
4792 "sized to gl_MaxPatchVertices (%d).",
4793 state
->Const
.MaxPatchVertices
);
4799 * Do additional processing necessary for geometry shader input declarations
4800 * (this covers both interface blocks arrays and bare input variables).
4803 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4804 YYLTYPE loc
, ir_variable
*var
)
4806 unsigned num_vertices
= 0;
4808 if (state
->gs_input_prim_type_specified
) {
4809 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4812 /* Geometry shader input variables must be arrays. Caller should have
4813 * reported an error for this.
4815 if (!var
->type
->is_array()) {
4816 assert(state
->error
);
4818 /* To avoid cascading failures, short circuit the checks below. */
4822 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4823 &state
->gs_input_size
,
4824 "geometry shader input");
4828 validate_identifier(const char *identifier
, YYLTYPE loc
,
4829 struct _mesa_glsl_parse_state
*state
)
4831 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4833 * "Identifiers starting with "gl_" are reserved for use by
4834 * OpenGL, and may not be declared in a shader as either a
4835 * variable or a function."
4837 if (is_gl_identifier(identifier
)) {
4838 _mesa_glsl_error(&loc
, state
,
4839 "identifier `%s' uses reserved `gl_' prefix",
4841 } else if (strstr(identifier
, "__")) {
4842 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4845 * "In addition, all identifiers containing two
4846 * consecutive underscores (__) are reserved as
4847 * possible future keywords."
4849 * The intention is that names containing __ are reserved for internal
4850 * use by the implementation, and names prefixed with GL_ are reserved
4851 * for use by Khronos. Names simply containing __ are dangerous to use,
4852 * but should be allowed.
4854 * A future version of the GLSL specification will clarify this.
4856 _mesa_glsl_warning(&loc
, state
,
4857 "identifier `%s' uses reserved `__' string",
4863 ast_declarator_list::hir(exec_list
*instructions
,
4864 struct _mesa_glsl_parse_state
*state
)
4867 const struct glsl_type
*decl_type
;
4868 const char *type_name
= NULL
;
4869 ir_rvalue
*result
= NULL
;
4870 YYLTYPE loc
= this->get_location();
4872 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4874 * "To ensure that a particular output variable is invariant, it is
4875 * necessary to use the invariant qualifier. It can either be used to
4876 * qualify a previously declared variable as being invariant
4878 * invariant gl_Position; // make existing gl_Position be invariant"
4880 * In these cases the parser will set the 'invariant' flag in the declarator
4881 * list, and the type will be NULL.
4883 if (this->invariant
) {
4884 assert(this->type
== NULL
);
4886 if (state
->current_function
!= NULL
) {
4887 _mesa_glsl_error(& loc
, state
,
4888 "all uses of `invariant' keyword must be at global "
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 "invariant", decl
->identifier
);
4902 } else if (!is_allowed_invariant(earlier
, state
)) {
4903 _mesa_glsl_error(&loc
, state
,
4904 "`%s' cannot be marked invariant; interfaces between "
4905 "shader stages only.", decl
->identifier
);
4906 } else if (earlier
->data
.used
) {
4907 _mesa_glsl_error(& loc
, state
,
4908 "variable `%s' may not be redeclared "
4909 "`invariant' after being used",
4912 earlier
->data
.explicit_invariant
= true;
4913 earlier
->data
.invariant
= true;
4917 /* Invariant redeclarations do not have r-values.
4922 if (this->precise
) {
4923 assert(this->type
== NULL
);
4925 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4926 assert(decl
->array_specifier
== NULL
);
4927 assert(decl
->initializer
== NULL
);
4929 ir_variable
*const earlier
=
4930 state
->symbols
->get_variable(decl
->identifier
);
4931 if (earlier
== NULL
) {
4932 _mesa_glsl_error(& loc
, state
,
4933 "undeclared variable `%s' cannot be marked "
4934 "precise", decl
->identifier
);
4935 } else if (state
->current_function
!= NULL
&&
4936 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4937 /* Note: we have to check if we're in a function, since
4938 * builtins are treated as having come from another scope.
4940 _mesa_glsl_error(& loc
, state
,
4941 "variable `%s' from an outer scope may not be "
4942 "redeclared `precise' in this scope",
4944 } else if (earlier
->data
.used
) {
4945 _mesa_glsl_error(& loc
, state
,
4946 "variable `%s' may not be redeclared "
4947 "`precise' after being used",
4950 earlier
->data
.precise
= true;
4954 /* Precise redeclarations do not have r-values either. */
4958 assert(this->type
!= NULL
);
4959 assert(!this->invariant
);
4960 assert(!this->precise
);
4962 /* GL_EXT_shader_image_load_store base type uses GLSL_TYPE_VOID as a special value to
4963 * indicate that it needs to be updated later (see glsl_parser.yy).
4964 * This is done here, based on the layout qualifier and the type of the image var
4966 if (this->type
->qualifier
.flags
.q
.explicit_image_format
&&
4967 this->type
->specifier
->type
->is_image() &&
4968 this->type
->qualifier
.image_base_type
== GLSL_TYPE_VOID
) {
4969 /* "The ARB_shader_image_load_store says:
4970 * If both extensions are enabled in the shading language, the "size*" layout
4971 * qualifiers are treated as format qualifiers, and are mapped to equivalent
4972 * format qualifiers in the table below, according to the type of image
4974 * image* iimage* uimage*
4975 * -------- -------- --------
4976 * size1x8 n/a r8i r8ui
4977 * size1x16 r16f r16i r16ui
4978 * size1x32 r32f r32i r32ui
4979 * size2x32 rg32f rg32i rg32ui
4980 * size4x32 rgba32f rgba32i rgba32ui"
4982 if (strncmp(this->type
->specifier
->type_name
, "image", strlen("image")) == 0) {
4983 switch (this->type
->qualifier
.image_format
) {
4984 case PIPE_FORMAT_R8_SINT
:
4985 /* No valid qualifier in this case, driver will need to look at
4986 * the underlying image's format (just like no qualifier being
4989 this->type
->qualifier
.image_format
= PIPE_FORMAT_NONE
;
4991 case PIPE_FORMAT_R16_SINT
:
4992 this->type
->qualifier
.image_format
= PIPE_FORMAT_R16_FLOAT
;
4994 case PIPE_FORMAT_R32_SINT
:
4995 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32_FLOAT
;
4997 case PIPE_FORMAT_R32G32_SINT
:
4998 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32G32_FLOAT
;
5000 case PIPE_FORMAT_R32G32B32A32_SINT
:
5001 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32G32B32A32_FLOAT
;
5004 unreachable("Unknown image format");
5006 this->type
->qualifier
.image_base_type
= GLSL_TYPE_FLOAT
;
5007 } else if (strncmp(this->type
->specifier
->type_name
, "uimage", strlen("uimage")) == 0) {
5008 switch (this->type
->qualifier
.image_format
) {
5009 case PIPE_FORMAT_R8_SINT
:
5010 this->type
->qualifier
.image_format
= PIPE_FORMAT_R8_UINT
;
5012 case PIPE_FORMAT_R16_SINT
:
5013 this->type
->qualifier
.image_format
= PIPE_FORMAT_R16_UINT
;
5015 case PIPE_FORMAT_R32_SINT
:
5016 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32_UINT
;
5018 case PIPE_FORMAT_R32G32_SINT
:
5019 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32G32_UINT
;
5021 case PIPE_FORMAT_R32G32B32A32_SINT
:
5022 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32G32B32A32_UINT
;
5025 unreachable("Unknown image format");
5027 this->type
->qualifier
.image_base_type
= GLSL_TYPE_UINT
;
5028 } else if (strncmp(this->type
->specifier
->type_name
, "iimage", strlen("iimage")) == 0) {
5029 this->type
->qualifier
.image_base_type
= GLSL_TYPE_INT
;
5035 /* The type specifier may contain a structure definition. Process that
5036 * before any of the variable declarations.
5038 (void) this->type
->specifier
->hir(instructions
, state
);
5040 decl_type
= this->type
->glsl_type(& type_name
, state
);
5042 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
5043 * "Buffer variables may only be declared inside interface blocks
5044 * (section 4.3.9 “Interface Blocks”), which are then referred to as
5045 * shader storage blocks. It is a compile-time error to declare buffer
5046 * variables at global scope (outside a block)."
5048 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
5049 _mesa_glsl_error(&loc
, state
,
5050 "buffer variables cannot be declared outside "
5051 "interface blocks");
5054 /* An offset-qualified atomic counter declaration sets the default
5055 * offset for the next declaration within the same atomic counter
5058 if (decl_type
&& decl_type
->contains_atomic()) {
5059 if (type
->qualifier
.flags
.q
.explicit_binding
&&
5060 type
->qualifier
.flags
.q
.explicit_offset
) {
5061 unsigned qual_binding
;
5062 unsigned qual_offset
;
5063 if (process_qualifier_constant(state
, &loc
, "binding",
5064 type
->qualifier
.binding
,
5066 && process_qualifier_constant(state
, &loc
, "offset",
5067 type
->qualifier
.offset
,
5069 if (qual_binding
< ARRAY_SIZE(state
->atomic_counter_offsets
))
5070 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
5074 ast_type_qualifier allowed_atomic_qual_mask
;
5075 allowed_atomic_qual_mask
.flags
.i
= 0;
5076 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
5077 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
5078 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
5080 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
5081 "invalid layout qualifier for",
5085 if (this->declarations
.is_empty()) {
5086 /* If there is no structure involved in the program text, there are two
5087 * possible scenarios:
5089 * - The program text contained something like 'vec4;'. This is an
5090 * empty declaration. It is valid but weird. Emit a warning.
5092 * - The program text contained something like 'S;' and 'S' is not the
5093 * name of a known structure type. This is both invalid and weird.
5096 * - The program text contained something like 'mediump float;'
5097 * when the programmer probably meant 'precision mediump
5098 * float;' Emit a warning with a description of what they
5099 * probably meant to do.
5101 * Note that if decl_type is NULL and there is a structure involved,
5102 * there must have been some sort of error with the structure. In this
5103 * case we assume that an error was already generated on this line of
5104 * code for the structure. There is no need to generate an additional,
5107 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
5110 if (decl_type
== NULL
) {
5111 _mesa_glsl_error(&loc
, state
,
5112 "invalid type `%s' in empty declaration",
5115 if (decl_type
->is_array()) {
5116 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
5119 * "... any declaration that leaves the size undefined is
5120 * disallowed as this would add complexity and there are no
5123 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
5124 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
5125 "or implicitly defined");
5128 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
5130 * "The combinations of types and qualifiers that cause
5131 * compile-time or link-time errors are the same whether or not
5132 * the declaration is empty."
5134 validate_array_dimensions(decl_type
, state
, &loc
);
5137 if (decl_type
->is_atomic_uint()) {
5138 /* Empty atomic counter declarations are allowed and useful
5139 * to set the default offset qualifier.
5142 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5143 if (this->type
->specifier
->structure
!= NULL
) {
5144 _mesa_glsl_error(&loc
, state
,
5145 "precision qualifiers can't be applied "
5148 static const char *const precision_names
[] = {
5155 _mesa_glsl_warning(&loc
, state
,
5156 "empty declaration with precision "
5157 "qualifier, to set the default precision, "
5158 "use `precision %s %s;'",
5159 precision_names
[this->type
->
5160 qualifier
.precision
],
5163 } else if (this->type
->specifier
->structure
== NULL
) {
5164 _mesa_glsl_warning(&loc
, state
, "empty declaration");
5169 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
5170 const struct glsl_type
*var_type
;
5172 const char *identifier
= decl
->identifier
;
5173 /* FINISHME: Emit a warning if a variable declaration shadows a
5174 * FINISHME: declaration at a higher scope.
5177 if ((decl_type
== NULL
) || decl_type
->is_void()) {
5178 if (type_name
!= NULL
) {
5179 _mesa_glsl_error(& loc
, state
,
5180 "invalid type `%s' in declaration of `%s'",
5181 type_name
, decl
->identifier
);
5183 _mesa_glsl_error(& loc
, state
,
5184 "invalid type in declaration of `%s'",
5190 if (this->type
->qualifier
.is_subroutine_decl()) {
5194 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
5196 _mesa_glsl_error(& loc
, state
,
5197 "invalid type in declaration of `%s'",
5199 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
5204 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
5207 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
5209 /* The 'varying in' and 'varying out' qualifiers can only be used with
5210 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
5213 if (this->type
->qualifier
.flags
.q
.varying
) {
5214 if (this->type
->qualifier
.flags
.q
.in
) {
5215 _mesa_glsl_error(& loc
, state
,
5216 "`varying in' qualifier in declaration of "
5217 "`%s' only valid for geometry shaders using "
5218 "ARB_geometry_shader4 or EXT_geometry_shader4",
5220 } else if (this->type
->qualifier
.flags
.q
.out
) {
5221 _mesa_glsl_error(& loc
, state
,
5222 "`varying out' qualifier in declaration of "
5223 "`%s' only valid for geometry shaders using "
5224 "ARB_geometry_shader4 or EXT_geometry_shader4",
5229 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
5231 * "Global variables can only use the qualifiers const,
5232 * attribute, uniform, or varying. Only one may be
5235 * Local variables can only use the qualifier const."
5237 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
5238 * any extension that adds the 'layout' keyword.
5240 if (!state
->is_version(130, 300)
5241 && !state
->has_explicit_attrib_location()
5242 && !state
->has_separate_shader_objects()
5243 && !state
->ARB_fragment_coord_conventions_enable
) {
5244 /* GL_EXT_gpu_shader4 only allows "varying out" on fragment shader
5245 * outputs. (the varying flag is not set by the parser)
5247 if (this->type
->qualifier
.flags
.q
.out
&&
5248 (!state
->EXT_gpu_shader4_enable
||
5249 state
->stage
!= MESA_SHADER_FRAGMENT
)) {
5250 _mesa_glsl_error(& loc
, state
,
5251 "`out' qualifier in declaration of `%s' "
5252 "only valid for function parameters in %s",
5253 decl
->identifier
, state
->get_version_string());
5255 if (this->type
->qualifier
.flags
.q
.in
) {
5256 _mesa_glsl_error(& loc
, state
,
5257 "`in' qualifier in declaration of `%s' "
5258 "only valid for function parameters in %s",
5259 decl
->identifier
, state
->get_version_string());
5261 /* FINISHME: Test for other invalid qualifiers. */
5264 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
5266 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
5269 if ((state
->zero_init
& (1u << var
->data
.mode
)) &&
5270 (var
->type
->is_numeric() || var
->type
->is_boolean())) {
5271 const ir_constant_data data
= { { 0 } };
5272 var
->data
.has_initializer
= true;
5273 var
->data
.is_implicit_initializer
= true;
5274 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
5277 if (this->type
->qualifier
.flags
.q
.invariant
) {
5278 if (!is_allowed_invariant(var
, state
)) {
5279 _mesa_glsl_error(&loc
, state
,
5280 "`%s' cannot be marked invariant; interfaces between "
5281 "shader stages only", var
->name
);
5285 if (state
->current_function
!= NULL
) {
5286 const char *mode
= NULL
;
5287 const char *extra
= "";
5289 /* There is no need to check for 'inout' here because the parser will
5290 * only allow that in function parameter lists.
5292 if (this->type
->qualifier
.flags
.q
.attribute
) {
5294 } else if (this->type
->qualifier
.is_subroutine_decl()) {
5295 mode
= "subroutine uniform";
5296 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
5298 } else if (this->type
->qualifier
.flags
.q
.varying
) {
5300 } else if (this->type
->qualifier
.flags
.q
.in
) {
5302 extra
= " or in function parameter list";
5303 } else if (this->type
->qualifier
.flags
.q
.out
) {
5305 extra
= " or in function parameter list";
5309 _mesa_glsl_error(& loc
, state
,
5310 "%s variable `%s' must be declared at "
5312 mode
, var
->name
, extra
);
5314 } else if (var
->data
.mode
== ir_var_shader_in
) {
5315 var
->data
.read_only
= true;
5317 if (state
->stage
== MESA_SHADER_VERTEX
) {
5318 bool error_emitted
= false;
5320 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
5322 * "Vertex shader inputs can only be float, floating-point
5323 * vectors, matrices, signed and unsigned integers and integer
5324 * vectors. Vertex shader inputs can also form arrays of these
5325 * types, but not structures."
5327 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
5329 * "Vertex shader inputs can only be float, floating-point
5330 * vectors, matrices, signed and unsigned integers and integer
5331 * vectors. They cannot be arrays or structures."
5333 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
5335 * "The attribute qualifier can be used only with float,
5336 * floating-point vectors, and matrices. Attribute variables
5337 * cannot be declared as arrays or structures."
5339 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
5341 * "Vertex shader inputs can only be float, floating-point
5342 * vectors, matrices, signed and unsigned integers and integer
5343 * vectors. Vertex shader inputs cannot be arrays or
5346 * From section 4.3.4 of the ARB_bindless_texture spec:
5348 * "(modify third paragraph of the section to allow sampler and
5349 * image types) ... Vertex shader inputs can only be float,
5350 * single-precision floating-point scalars, single-precision
5351 * floating-point vectors, matrices, signed and unsigned
5352 * integers and integer vectors, sampler and image types."
5354 const glsl_type
*check_type
= var
->type
->without_array();
5356 switch (check_type
->base_type
) {
5357 case GLSL_TYPE_FLOAT
:
5359 case GLSL_TYPE_UINT64
:
5360 case GLSL_TYPE_INT64
:
5362 case GLSL_TYPE_UINT
:
5364 if (state
->is_version(120, 300) || state
->EXT_gpu_shader4_enable
)
5366 case GLSL_TYPE_DOUBLE
:
5367 if (check_type
->is_double() && (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
5369 case GLSL_TYPE_SAMPLER
:
5370 if (check_type
->is_sampler() && state
->has_bindless())
5372 case GLSL_TYPE_IMAGE
:
5373 if (check_type
->is_image() && state
->has_bindless())
5377 _mesa_glsl_error(& loc
, state
,
5378 "vertex shader input / attribute cannot have "
5380 var
->type
->is_array() ? "array of " : "",
5382 error_emitted
= true;
5385 if (!error_emitted
&& var
->type
->is_array() &&
5386 !state
->check_version(150, 0, &loc
,
5387 "vertex shader input / attribute "
5388 "cannot have array type")) {
5389 error_emitted
= true;
5391 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
5392 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5394 * Geometry shader input variables get the per-vertex values
5395 * written out by vertex shader output variables of the same
5396 * names. Since a geometry shader operates on a set of
5397 * vertices, each input varying variable (or input block, see
5398 * interface blocks below) needs to be declared as an array.
5400 if (!var
->type
->is_array()) {
5401 _mesa_glsl_error(&loc
, state
,
5402 "geometry shader inputs must be arrays");
5405 handle_geometry_shader_input_decl(state
, loc
, var
);
5406 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5407 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5409 * It is a compile-time error to declare a fragment shader
5410 * input with, or that contains, any of the following types:
5414 * * An array of arrays
5415 * * An array of structures
5416 * * A structure containing an array
5417 * * A structure containing a structure
5419 if (state
->es_shader
) {
5420 const glsl_type
*check_type
= var
->type
->without_array();
5421 if (check_type
->is_boolean() ||
5422 check_type
->contains_opaque()) {
5423 _mesa_glsl_error(&loc
, state
,
5424 "fragment shader input cannot have type %s",
5427 if (var
->type
->is_array() &&
5428 var
->type
->fields
.array
->is_array()) {
5429 _mesa_glsl_error(&loc
, state
,
5431 "cannot have an array of arrays",
5432 _mesa_shader_stage_to_string(state
->stage
));
5434 if (var
->type
->is_array() &&
5435 var
->type
->fields
.array
->is_struct()) {
5436 _mesa_glsl_error(&loc
, state
,
5437 "fragment shader input "
5438 "cannot have an array of structs");
5440 if (var
->type
->is_struct()) {
5441 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5442 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5443 var
->type
->fields
.structure
[i
].type
->is_struct())
5444 _mesa_glsl_error(&loc
, state
,
5445 "fragment shader input cannot have "
5446 "a struct that contains an "
5451 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5452 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5453 handle_tess_shader_input_decl(state
, loc
, var
);
5455 } else if (var
->data
.mode
== ir_var_shader_out
) {
5456 const glsl_type
*check_type
= var
->type
->without_array();
5458 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5460 * It is a compile-time error to declare a fragment shader output
5461 * that contains any of the following:
5463 * * A Boolean type (bool, bvec2 ...)
5464 * * A double-precision scalar or vector (double, dvec2 ...)
5469 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5470 if (check_type
->is_struct() || check_type
->is_matrix())
5471 _mesa_glsl_error(&loc
, state
,
5472 "fragment shader output "
5473 "cannot have struct or matrix type");
5474 switch (check_type
->base_type
) {
5475 case GLSL_TYPE_UINT
:
5477 case GLSL_TYPE_FLOAT
:
5480 _mesa_glsl_error(&loc
, state
,
5481 "fragment shader output cannot have "
5482 "type %s", check_type
->name
);
5486 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5488 * It is a compile-time error to declare a vertex shader output
5489 * with, or that contains, any of the following types:
5493 * * An array of arrays
5494 * * An array of structures
5495 * * A structure containing an array
5496 * * A structure containing a structure
5498 * It is a compile-time error to declare a fragment shader output
5499 * with, or that contains, any of the following types:
5505 * * An array of array
5507 * ES 3.20 updates this to apply to tessellation and geometry shaders
5508 * as well. Because there are per-vertex arrays in the new stages,
5509 * it strikes the "array of..." rules and replaces them with these:
5511 * * For per-vertex-arrayed variables (applies to tessellation
5512 * control, tessellation evaluation and geometry shaders):
5514 * * Per-vertex-arrayed arrays of arrays
5515 * * Per-vertex-arrayed arrays of structures
5517 * * For non-per-vertex-arrayed variables:
5519 * * An array of arrays
5520 * * An array of structures
5522 * which basically says to unwrap the per-vertex aspect and apply
5525 if (state
->es_shader
) {
5526 if (var
->type
->is_array() &&
5527 var
->type
->fields
.array
->is_array()) {
5528 _mesa_glsl_error(&loc
, state
,
5530 "cannot have an array of arrays",
5531 _mesa_shader_stage_to_string(state
->stage
));
5533 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5534 const glsl_type
*type
= var
->type
;
5536 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5537 !var
->data
.patch
&& var
->type
->is_array()) {
5538 type
= var
->type
->fields
.array
;
5541 if (type
->is_array() && type
->fields
.array
->is_struct()) {
5542 _mesa_glsl_error(&loc
, state
,
5543 "%s shader output cannot have "
5544 "an array of structs",
5545 _mesa_shader_stage_to_string(state
->stage
));
5547 if (type
->is_struct()) {
5548 for (unsigned i
= 0; i
< type
->length
; i
++) {
5549 if (type
->fields
.structure
[i
].type
->is_array() ||
5550 type
->fields
.structure
[i
].type
->is_struct())
5551 _mesa_glsl_error(&loc
, state
,
5552 "%s shader output cannot have a "
5553 "struct that contains an "
5555 _mesa_shader_stage_to_string(state
->stage
));
5561 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5562 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5564 } else if (var
->type
->contains_subroutine()) {
5565 /* declare subroutine uniforms as hidden */
5566 var
->data
.how_declared
= ir_var_hidden
;
5569 /* From section 4.3.4 of the GLSL 4.00 spec:
5570 * "Input variables may not be declared using the patch in qualifier
5571 * in tessellation control or geometry shaders."
5573 * From section 4.3.6 of the GLSL 4.00 spec:
5574 * "It is an error to use patch out in a vertex, tessellation
5575 * evaluation, or geometry shader."
5577 * This doesn't explicitly forbid using them in a fragment shader, but
5578 * that's probably just an oversight.
5580 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5581 && this->type
->qualifier
.flags
.q
.patch
5582 && this->type
->qualifier
.flags
.q
.in
) {
5584 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5585 "tessellation evaluation shader");
5588 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5589 && this->type
->qualifier
.flags
.q
.patch
5590 && this->type
->qualifier
.flags
.q
.out
) {
5592 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5593 "tessellation control shader");
5596 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5598 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5599 state
->check_precision_qualifiers_allowed(&loc
);
5602 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5603 !precision_qualifier_allowed(var
->type
)) {
5604 _mesa_glsl_error(&loc
, state
,
5605 "precision qualifiers apply only to floating point"
5606 ", integer and opaque types");
5609 /* From section 4.1.7 of the GLSL 4.40 spec:
5611 * "[Opaque types] can only be declared as function
5612 * parameters or uniform-qualified variables."
5614 * From section 4.1.7 of the ARB_bindless_texture spec:
5616 * "Samplers may be declared as shader inputs and outputs, as uniform
5617 * variables, as temporary variables, and as function parameters."
5619 * From section 4.1.X of the ARB_bindless_texture spec:
5621 * "Images may be declared as shader inputs and outputs, as uniform
5622 * variables, as temporary variables, and as function parameters."
5624 if (!this->type
->qualifier
.flags
.q
.uniform
&&
5625 (var_type
->contains_atomic() ||
5626 (!state
->has_bindless() && var_type
->contains_opaque()))) {
5627 _mesa_glsl_error(&loc
, state
,
5628 "%s variables must be declared uniform",
5629 state
->has_bindless() ? "atomic" : "opaque");
5632 /* Process the initializer and add its instructions to a temporary
5633 * list. This list will be added to the instruction stream (below) after
5634 * the declaration is added. This is done because in some cases (such as
5635 * redeclarations) the declaration may not actually be added to the
5636 * instruction stream.
5638 exec_list initializer_instructions
;
5640 /* Examine var name here since var may get deleted in the next call */
5641 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5643 bool is_redeclaration
;
5644 var
= get_variable_being_redeclared(&var
, decl
->get_location(), state
,
5645 false /* allow_all_redeclarations */,
5647 if (is_redeclaration
) {
5649 var
->data
.how_declared
== ir_var_declared_in_block
) {
5650 _mesa_glsl_error(&loc
, state
,
5651 "`%s' has already been redeclared using "
5652 "gl_PerVertex", var
->name
);
5654 var
->data
.how_declared
= ir_var_declared_normally
;
5657 if (decl
->initializer
!= NULL
) {
5658 result
= process_initializer(var
,
5660 &initializer_instructions
, state
);
5662 validate_array_dimensions(var_type
, state
, &loc
);
5665 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5667 * "It is an error to write to a const variable outside of
5668 * its declaration, so they must be initialized when
5671 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5672 _mesa_glsl_error(& loc
, state
,
5673 "const declaration of `%s' must be initialized",
5677 if (state
->es_shader
) {
5678 const glsl_type
*const t
= var
->type
;
5680 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5682 * The GL_OES_tessellation_shader spec says about inputs:
5684 * "Declaring an array size is optional. If no size is specified,
5685 * it will be taken from the implementation-dependent maximum
5686 * patch size (gl_MaxPatchVertices)."
5688 * and about TCS outputs:
5690 * "If no size is specified, it will be taken from output patch
5691 * size declared in the shader."
5693 * The GL_OES_geometry_shader spec says:
5695 * "All geometry shader input unsized array declarations will be
5696 * sized by an earlier input primitive layout qualifier, when
5697 * present, as per the following table."
5699 const bool implicitly_sized
=
5700 (var
->data
.mode
== ir_var_shader_in
&&
5701 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5702 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5703 (var
->data
.mode
== ir_var_shader_out
&&
5704 state
->stage
== MESA_SHADER_TESS_CTRL
);
5706 if (t
->is_unsized_array() && !implicitly_sized
)
5707 /* Section 10.17 of the GLSL ES 1.00 specification states that
5708 * unsized array declarations have been removed from the language.
5709 * Arrays that are sized using an initializer are still explicitly
5710 * sized. However, GLSL ES 1.00 does not allow array
5711 * initializers. That is only allowed in GLSL ES 3.00.
5713 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5715 * "An array type can also be formed without specifying a size
5716 * if the definition includes an initializer:
5718 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5719 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5724 _mesa_glsl_error(& loc
, state
,
5725 "unsized array declarations are not allowed in "
5729 /* Section 4.4.6.1 Atomic Counter Layout Qualifiers of the GLSL 4.60 spec:
5731 * "It is a compile-time error to declare an unsized array of
5734 if (var
->type
->is_unsized_array() &&
5735 var
->type
->without_array()->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
5736 _mesa_glsl_error(& loc
, state
,
5737 "Unsized array of atomic_uint is not allowed");
5740 /* If the declaration is not a redeclaration, there are a few additional
5741 * semantic checks that must be applied. In addition, variable that was
5742 * created for the declaration should be added to the IR stream.
5744 if (!is_redeclaration
) {
5745 validate_identifier(decl
->identifier
, loc
, state
);
5747 /* Add the variable to the symbol table. Note that the initializer's
5748 * IR was already processed earlier (though it hasn't been emitted
5749 * yet), without the variable in scope.
5751 * This differs from most C-like languages, but it follows the GLSL
5752 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5755 * "Within a declaration, the scope of a name starts immediately
5756 * after the initializer if present or immediately after the name
5757 * being declared if not."
5759 if (!state
->symbols
->add_variable(var
)) {
5760 YYLTYPE loc
= this->get_location();
5761 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5762 "current scope", decl
->identifier
);
5766 /* Push the variable declaration to the top. It means that all the
5767 * variable declarations will appear in a funny last-to-first order,
5768 * but otherwise we run into trouble if a function is prototyped, a
5769 * global var is decled, then the function is defined with usage of
5770 * the global var. See glslparsertest's CorrectModule.frag.
5772 instructions
->push_head(var
);
5775 instructions
->append_list(&initializer_instructions
);
5779 /* Generally, variable declarations do not have r-values. However,
5780 * one is used for the declaration in
5782 * while (bool b = some_condition()) {
5786 * so we return the rvalue from the last seen declaration here.
5793 ast_parameter_declarator::hir(exec_list
*instructions
,
5794 struct _mesa_glsl_parse_state
*state
)
5797 const struct glsl_type
*type
;
5798 const char *name
= NULL
;
5799 YYLTYPE loc
= this->get_location();
5801 type
= this->type
->glsl_type(& name
, state
);
5805 _mesa_glsl_error(& loc
, state
,
5806 "invalid type `%s' in declaration of `%s'",
5807 name
, this->identifier
);
5809 _mesa_glsl_error(& loc
, state
,
5810 "invalid type in declaration of `%s'",
5814 type
= glsl_type::error_type
;
5817 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5819 * "Functions that accept no input arguments need not use void in the
5820 * argument list because prototypes (or definitions) are required and
5821 * therefore there is no ambiguity when an empty argument list "( )" is
5822 * declared. The idiom "(void)" as a parameter list is provided for
5825 * Placing this check here prevents a void parameter being set up
5826 * for a function, which avoids tripping up checks for main taking
5827 * parameters and lookups of an unnamed symbol.
5829 if (type
->is_void()) {
5830 if (this->identifier
!= NULL
)
5831 _mesa_glsl_error(& loc
, state
,
5832 "named parameter cannot have type `void'");
5838 if (formal_parameter
&& (this->identifier
== NULL
)) {
5839 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5843 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5844 * call already handled the "vec4[..] foo" case.
5846 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5848 if (!type
->is_error() && type
->is_unsized_array()) {
5849 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5851 type
= glsl_type::error_type
;
5855 ir_variable
*var
= new(ctx
)
5856 ir_variable(type
, this->identifier
, ir_var_function_in
);
5858 /* Apply any specified qualifiers to the parameter declaration. Note that
5859 * for function parameters the default mode is 'in'.
5861 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5864 if (((1u << var
->data
.mode
) & state
->zero_init
) &&
5865 (var
->type
->is_numeric() || var
->type
->is_boolean())) {
5866 const ir_constant_data data
= { { 0 } };
5867 var
->data
.has_initializer
= true;
5868 var
->data
.is_implicit_initializer
= true;
5869 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
5872 /* From section 4.1.7 of the GLSL 4.40 spec:
5874 * "Opaque variables cannot be treated as l-values; hence cannot
5875 * be used as out or inout function parameters, nor can they be
5878 * From section 4.1.7 of the ARB_bindless_texture spec:
5880 * "Samplers can be used as l-values, so can be assigned into and used
5881 * as "out" and "inout" function parameters."
5883 * From section 4.1.X of the ARB_bindless_texture spec:
5885 * "Images can be used as l-values, so can be assigned into and used as
5886 * "out" and "inout" function parameters."
5888 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5889 && (type
->contains_atomic() ||
5890 (!state
->has_bindless() && type
->contains_opaque()))) {
5891 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5892 "contain %s variables",
5893 state
->has_bindless() ? "atomic" : "opaque");
5894 type
= glsl_type::error_type
;
5897 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5899 * "When calling a function, expressions that do not evaluate to
5900 * l-values cannot be passed to parameters declared as out or inout."
5902 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5904 * "Other binary or unary expressions, non-dereferenced arrays,
5905 * function names, swizzles with repeated fields, and constants
5906 * cannot be l-values."
5908 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5909 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5911 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5913 && !state
->check_version(120, 100, &loc
,
5914 "arrays cannot be out or inout parameters")) {
5915 type
= glsl_type::error_type
;
5918 instructions
->push_tail(var
);
5920 /* Parameter declarations do not have r-values.
5927 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5929 exec_list
*ir_parameters
,
5930 _mesa_glsl_parse_state
*state
)
5932 ast_parameter_declarator
*void_param
= NULL
;
5935 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5936 param
->formal_parameter
= formal
;
5937 param
->hir(ir_parameters
, state
);
5945 if ((void_param
!= NULL
) && (count
> 1)) {
5946 YYLTYPE loc
= void_param
->get_location();
5948 _mesa_glsl_error(& loc
, state
,
5949 "`void' parameter must be only parameter");
5955 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5957 /* IR invariants disallow function declarations or definitions
5958 * nested within other function definitions. But there is no
5959 * requirement about the relative order of function declarations
5960 * and definitions with respect to one another. So simply insert
5961 * the new ir_function block at the end of the toplevel instruction
5964 state
->toplevel_ir
->push_tail(f
);
5969 ast_function::hir(exec_list
*instructions
,
5970 struct _mesa_glsl_parse_state
*state
)
5973 ir_function
*f
= NULL
;
5974 ir_function_signature
*sig
= NULL
;
5975 exec_list hir_parameters
;
5976 YYLTYPE loc
= this->get_location();
5978 const char *const name
= identifier
;
5980 /* New functions are always added to the top-level IR instruction stream,
5981 * so this instruction list pointer is ignored. See also emit_function
5984 (void) instructions
;
5986 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5988 * "Function declarations (prototypes) cannot occur inside of functions;
5989 * they must be at global scope, or for the built-in functions, outside
5990 * the global scope."
5992 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5994 * "User defined functions may only be defined within the global scope."
5996 * Note that this language does not appear in GLSL 1.10.
5998 if ((state
->current_function
!= NULL
) &&
5999 state
->is_version(120, 100)) {
6000 YYLTYPE loc
= this->get_location();
6001 _mesa_glsl_error(&loc
, state
,
6002 "declaration of function `%s' not allowed within "
6003 "function body", name
);
6006 validate_identifier(name
, this->get_location(), state
);
6008 /* Convert the list of function parameters to HIR now so that they can be
6009 * used below to compare this function's signature with previously seen
6010 * signatures for functions with the same name.
6012 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
6014 & hir_parameters
, state
);
6016 const char *return_type_name
;
6017 const glsl_type
*return_type
=
6018 this->return_type
->glsl_type(& return_type_name
, state
);
6021 YYLTYPE loc
= this->get_location();
6022 _mesa_glsl_error(&loc
, state
,
6023 "function `%s' has undeclared return type `%s'",
6024 name
, return_type_name
);
6025 return_type
= glsl_type::error_type
;
6028 /* ARB_shader_subroutine states:
6029 * "Subroutine declarations cannot be prototyped. It is an error to prepend
6030 * subroutine(...) to a function declaration."
6032 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
6033 YYLTYPE loc
= this->get_location();
6034 _mesa_glsl_error(&loc
, state
,
6035 "function declaration `%s' cannot have subroutine prepended",
6039 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
6040 * "No qualifier is allowed on the return type of a function."
6042 if (this->return_type
->has_qualifiers(state
)) {
6043 YYLTYPE loc
= this->get_location();
6044 _mesa_glsl_error(& loc
, state
,
6045 "function `%s' return type has qualifiers", name
);
6048 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
6050 * "Arrays are allowed as arguments and as the return type. In both
6051 * cases, the array must be explicitly sized."
6053 if (return_type
->is_unsized_array()) {
6054 YYLTYPE loc
= this->get_location();
6055 _mesa_glsl_error(& loc
, state
,
6056 "function `%s' return type array must be explicitly "
6060 /* From Section 6.1 (Function Definitions) of the GLSL 1.00 spec:
6062 * "Arrays are allowed as arguments, but not as the return type. [...]
6063 * The return type can also be a structure if the structure does not
6064 * contain an array."
6066 if (state
->language_version
== 100 && return_type
->contains_array()) {
6067 YYLTYPE loc
= this->get_location();
6068 _mesa_glsl_error(& loc
, state
,
6069 "function `%s' return type contains an array", name
);
6072 /* From section 4.1.7 of the GLSL 4.40 spec:
6074 * "[Opaque types] can only be declared as function parameters
6075 * or uniform-qualified variables."
6077 * The ARB_bindless_texture spec doesn't clearly state this, but as it says
6078 * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X,
6079 * (Images)", this should be allowed.
6081 if (return_type
->contains_atomic() ||
6082 (!state
->has_bindless() && return_type
->contains_opaque())) {
6083 YYLTYPE loc
= this->get_location();
6084 _mesa_glsl_error(&loc
, state
,
6085 "function `%s' return type can't contain an %s type",
6086 name
, state
->has_bindless() ? "atomic" : "opaque");
6090 if (return_type
->is_subroutine()) {
6091 YYLTYPE loc
= this->get_location();
6092 _mesa_glsl_error(&loc
, state
,
6093 "function `%s' return type can't be a subroutine type",
6097 /* Get the precision for the return type */
6098 unsigned return_precision
;
6100 if (state
->es_shader
) {
6101 YYLTYPE loc
= this->get_location();
6103 select_gles_precision(this->return_type
->qualifier
.precision
,
6108 return_precision
= GLSL_PRECISION_NONE
;
6111 /* Create an ir_function if one doesn't already exist. */
6112 f
= state
->symbols
->get_function(name
);
6114 f
= new(ctx
) ir_function(name
);
6115 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
6116 if (!state
->symbols
->add_function(f
)) {
6117 /* This function name shadows a non-function use of the same name. */
6118 YYLTYPE loc
= this->get_location();
6119 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
6120 "non-function", name
);
6124 emit_function(state
, f
);
6127 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
6129 * "A shader cannot redefine or overload built-in functions."
6131 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
6133 * "User code can overload the built-in functions but cannot redefine
6136 if (state
->es_shader
) {
6137 /* Local shader has no exact candidates; check the built-ins. */
6138 if (state
->language_version
>= 300 &&
6139 _mesa_glsl_has_builtin_function(state
, name
)) {
6140 YYLTYPE loc
= this->get_location();
6141 _mesa_glsl_error(& loc
, state
,
6142 "A shader cannot redefine or overload built-in "
6143 "function `%s' in GLSL ES 3.00", name
);
6147 if (state
->language_version
== 100) {
6148 ir_function_signature
*sig
=
6149 _mesa_glsl_find_builtin_function(state
, name
, &hir_parameters
);
6150 if (sig
&& sig
->is_builtin()) {
6151 _mesa_glsl_error(& loc
, state
,
6152 "A shader cannot redefine built-in "
6153 "function `%s' in GLSL ES 1.00", name
);
6158 /* Verify that this function's signature either doesn't match a previously
6159 * seen signature for a function with the same name, or, if a match is found,
6160 * that the previously seen signature does not have an associated definition.
6162 if (state
->es_shader
|| f
->has_user_signature()) {
6163 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
6165 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
6166 if (badvar
!= NULL
) {
6167 YYLTYPE loc
= this->get_location();
6169 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
6170 "qualifiers don't match prototype", name
, badvar
);
6173 if (sig
->return_type
!= return_type
) {
6174 YYLTYPE loc
= this->get_location();
6176 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
6177 "match prototype", name
);
6180 if (sig
->return_precision
!= return_precision
) {
6181 YYLTYPE loc
= this->get_location();
6183 _mesa_glsl_error(&loc
, state
, "function `%s' return type precision "
6184 "doesn't match prototype", name
);
6187 if (sig
->is_defined
) {
6188 if (is_definition
) {
6189 YYLTYPE loc
= this->get_location();
6190 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
6192 /* We just encountered a prototype that exactly matches a
6193 * function that's already been defined. This is redundant,
6194 * and we should ignore it.
6198 } else if (state
->language_version
== 100 && !is_definition
) {
6199 /* From the GLSL 1.00 spec, section 4.2.7:
6201 * "A particular variable, structure or function declaration
6202 * may occur at most once within a scope with the exception
6203 * that a single function prototype plus the corresponding
6204 * function definition are allowed."
6206 YYLTYPE loc
= this->get_location();
6207 _mesa_glsl_error(&loc
, state
, "function `%s' redeclared", name
);
6212 /* Verify the return type of main() */
6213 if (strcmp(name
, "main") == 0) {
6214 if (! return_type
->is_void()) {
6215 YYLTYPE loc
= this->get_location();
6217 _mesa_glsl_error(& loc
, state
, "main() must return void");
6220 if (!hir_parameters
.is_empty()) {
6221 YYLTYPE loc
= this->get_location();
6223 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
6227 /* Finish storing the information about this new function in its signature.
6230 sig
= new(ctx
) ir_function_signature(return_type
);
6231 sig
->return_precision
= return_precision
;
6232 f
->add_signature(sig
);
6235 sig
->replace_parameters(&hir_parameters
);
6238 if (this->return_type
->qualifier
.subroutine_list
) {
6241 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
6242 unsigned qual_index
;
6243 if (process_qualifier_constant(state
, &loc
, "index",
6244 this->return_type
->qualifier
.index
,
6246 if (!state
->has_explicit_uniform_location()) {
6247 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
6248 "GL_ARB_explicit_uniform_location or "
6250 } else if (qual_index
>= MAX_SUBROUTINES
) {
6251 _mesa_glsl_error(&loc
, state
,
6252 "invalid subroutine index (%d) index must "
6253 "be a number between 0 and "
6254 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
6255 MAX_SUBROUTINES
- 1);
6257 f
->subroutine_index
= qual_index
;
6262 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
6263 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
6264 f
->num_subroutine_types
);
6266 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
6267 const struct glsl_type
*type
;
6268 /* the subroutine type must be already declared */
6269 type
= state
->symbols
->get_type(decl
->identifier
);
6271 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
6274 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
6275 ir_function
*fn
= state
->subroutine_types
[i
];
6276 ir_function_signature
*tsig
= NULL
;
6278 if (strcmp(fn
->name
, decl
->identifier
))
6281 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
6284 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
6286 if (tsig
->return_type
!= sig
->return_type
) {
6287 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
6291 f
->subroutine_types
[idx
++] = type
;
6293 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
6295 state
->num_subroutines
+ 1);
6296 state
->subroutines
[state
->num_subroutines
] = f
;
6297 state
->num_subroutines
++;
6301 if (this->return_type
->qualifier
.is_subroutine_decl()) {
6302 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
6303 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
6306 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
6308 state
->num_subroutine_types
+ 1);
6309 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
6310 state
->num_subroutine_types
++;
6312 f
->is_subroutine
= true;
6315 /* Function declarations (prototypes) do not have r-values.
6322 ast_function_definition::hir(exec_list
*instructions
,
6323 struct _mesa_glsl_parse_state
*state
)
6325 prototype
->is_definition
= true;
6326 prototype
->hir(instructions
, state
);
6328 ir_function_signature
*signature
= prototype
->signature
;
6329 if (signature
== NULL
)
6332 assert(state
->current_function
== NULL
);
6333 state
->current_function
= signature
;
6334 state
->found_return
= false;
6335 state
->found_begin_interlock
= false;
6336 state
->found_end_interlock
= false;
6338 /* Duplicate parameters declared in the prototype as concrete variables.
6339 * Add these to the symbol table.
6341 state
->symbols
->push_scope();
6342 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
6343 assert(var
->as_variable() != NULL
);
6345 /* The only way a parameter would "exist" is if two parameters have
6348 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
6349 YYLTYPE loc
= this->get_location();
6351 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
6353 state
->symbols
->add_variable(var
);
6357 /* Convert the body of the function to HIR. */
6358 this->body
->hir(&signature
->body
, state
);
6359 signature
->is_defined
= true;
6361 state
->symbols
->pop_scope();
6363 assert(state
->current_function
== signature
);
6364 state
->current_function
= NULL
;
6366 if (!signature
->return_type
->is_void() && !state
->found_return
) {
6367 YYLTYPE loc
= this->get_location();
6368 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
6369 "%s, but no return statement",
6370 signature
->function_name(),
6371 signature
->return_type
->name
);
6374 /* Function definitions do not have r-values.
6381 ast_jump_statement::hir(exec_list
*instructions
,
6382 struct _mesa_glsl_parse_state
*state
)
6389 assert(state
->current_function
);
6391 if (opt_return_value
) {
6392 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
6394 /* The value of the return type can be NULL if the shader says
6395 * 'return foo();' and foo() is a function that returns void.
6397 * NOTE: The GLSL spec doesn't say that this is an error. The type
6398 * of the return value is void. If the return type of the function is
6399 * also void, then this should compile without error. Seriously.
6401 const glsl_type
*const ret_type
=
6402 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
6404 /* Implicit conversions are not allowed for return values prior to
6405 * ARB_shading_language_420pack.
6407 if (state
->current_function
->return_type
!= ret_type
) {
6408 YYLTYPE loc
= this->get_location();
6410 if (state
->has_420pack()) {
6411 if (!apply_implicit_conversion(state
->current_function
->return_type
,
6413 || (ret
->type
!= state
->current_function
->return_type
)) {
6414 _mesa_glsl_error(& loc
, state
,
6415 "could not implicitly convert return value "
6416 "to %s, in function `%s'",
6417 state
->current_function
->return_type
->name
,
6418 state
->current_function
->function_name());
6421 _mesa_glsl_error(& loc
, state
,
6422 "`return' with wrong type %s, in function `%s' "
6425 state
->current_function
->function_name(),
6426 state
->current_function
->return_type
->name
);
6428 } else if (state
->current_function
->return_type
->base_type
==
6430 YYLTYPE loc
= this->get_location();
6432 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
6433 * specs add a clarification:
6435 * "A void function can only use return without a return argument, even if
6436 * the return argument has void type. Return statements only accept values:
6439 * void func2() { return func1(); } // illegal return statement"
6441 _mesa_glsl_error(& loc
, state
,
6442 "void functions can only use `return' without a "
6446 inst
= new(ctx
) ir_return(ret
);
6448 if (state
->current_function
->return_type
->base_type
!=
6450 YYLTYPE loc
= this->get_location();
6452 _mesa_glsl_error(& loc
, state
,
6453 "`return' with no value, in function %s returning "
6455 state
->current_function
->function_name());
6457 inst
= new(ctx
) ir_return
;
6460 state
->found_return
= true;
6461 instructions
->push_tail(inst
);
6466 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6467 YYLTYPE loc
= this->get_location();
6469 _mesa_glsl_error(& loc
, state
,
6470 "`discard' may only appear in a fragment shader");
6472 instructions
->push_tail(new(ctx
) ir_discard
);
6477 if (mode
== ast_continue
&&
6478 state
->loop_nesting_ast
== NULL
) {
6479 YYLTYPE loc
= this->get_location();
6481 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
6482 } else if (mode
== ast_break
&&
6483 state
->loop_nesting_ast
== NULL
&&
6484 state
->switch_state
.switch_nesting_ast
== NULL
) {
6485 YYLTYPE loc
= this->get_location();
6487 _mesa_glsl_error(& loc
, state
,
6488 "break may only appear in a loop or a switch");
6490 /* For a loop, inline the for loop expression again, since we don't
6491 * know where near the end of the loop body the normal copy of it is
6492 * going to be placed. Same goes for the condition for a do-while
6495 if (state
->loop_nesting_ast
!= NULL
&&
6496 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
6497 if (state
->loop_nesting_ast
->rest_expression
) {
6498 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
6501 if (state
->loop_nesting_ast
->mode
==
6502 ast_iteration_statement::ast_do_while
) {
6503 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
6507 if (state
->switch_state
.is_switch_innermost
&&
6508 mode
== ast_continue
) {
6509 /* Set 'continue_inside' to true. */
6510 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6511 ir_dereference_variable
*deref_continue_inside_var
=
6512 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6513 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6516 /* Break out from the switch, continue for the loop will
6517 * be called right after switch. */
6518 ir_loop_jump
*const jump
=
6519 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6520 instructions
->push_tail(jump
);
6522 } else if (state
->switch_state
.is_switch_innermost
&&
6523 mode
== ast_break
) {
6524 /* Force break out of switch by inserting a break. */
6525 ir_loop_jump
*const jump
=
6526 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6527 instructions
->push_tail(jump
);
6529 ir_loop_jump
*const jump
=
6530 new(ctx
) ir_loop_jump((mode
== ast_break
)
6531 ? ir_loop_jump::jump_break
6532 : ir_loop_jump::jump_continue
);
6533 instructions
->push_tail(jump
);
6540 /* Jump instructions do not have r-values.
6547 ast_demote_statement::hir(exec_list
*instructions
,
6548 struct _mesa_glsl_parse_state
*state
)
6552 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6553 YYLTYPE loc
= this->get_location();
6555 _mesa_glsl_error(& loc
, state
,
6556 "`demote' may only appear in a fragment shader");
6559 instructions
->push_tail(new(ctx
) ir_demote
);
6566 ast_selection_statement::hir(exec_list
*instructions
,
6567 struct _mesa_glsl_parse_state
*state
)
6571 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6573 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6575 * "Any expression whose type evaluates to a Boolean can be used as the
6576 * conditional expression bool-expression. Vector types are not accepted
6577 * as the expression to if."
6579 * The checks are separated so that higher quality diagnostics can be
6580 * generated for cases where both rules are violated.
6582 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6583 YYLTYPE loc
= this->condition
->get_location();
6585 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6589 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6591 if (then_statement
!= NULL
) {
6592 state
->symbols
->push_scope();
6593 then_statement
->hir(& stmt
->then_instructions
, state
);
6594 state
->symbols
->pop_scope();
6597 if (else_statement
!= NULL
) {
6598 state
->symbols
->push_scope();
6599 else_statement
->hir(& stmt
->else_instructions
, state
);
6600 state
->symbols
->pop_scope();
6603 instructions
->push_tail(stmt
);
6605 /* if-statements do not have r-values.
6612 /** Value of the case label. */
6615 /** Does this label occur after the default? */
6619 * AST for the case label.
6621 * This is only used to generate error messages for duplicate labels.
6623 ast_expression
*ast
;
6626 /* Used for detection of duplicate case values, compare
6627 * given contents directly.
6630 compare_case_value(const void *a
, const void *b
)
6632 return ((struct case_label
*) a
)->value
== ((struct case_label
*) b
)->value
;
6636 /* Used for detection of duplicate case values, just
6637 * returns key contents as is.
6640 key_contents(const void *key
)
6642 return ((struct case_label
*) key
)->value
;
6647 ast_switch_statement::hir(exec_list
*instructions
,
6648 struct _mesa_glsl_parse_state
*state
)
6652 ir_rvalue
*const test_expression
=
6653 this->test_expression
->hir(instructions
, state
);
6655 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6657 * "The type of init-expression in a switch statement must be a
6660 if (!test_expression
->type
->is_scalar() ||
6661 !test_expression
->type
->is_integer_32()) {
6662 YYLTYPE loc
= this->test_expression
->get_location();
6664 _mesa_glsl_error(& loc
,
6666 "switch-statement expression must be scalar "
6671 /* Track the switch-statement nesting in a stack-like manner.
6673 struct glsl_switch_state saved
= state
->switch_state
;
6675 state
->switch_state
.is_switch_innermost
= true;
6676 state
->switch_state
.switch_nesting_ast
= this;
6677 state
->switch_state
.labels_ht
=
6678 _mesa_hash_table_create(NULL
, key_contents
,
6679 compare_case_value
);
6680 state
->switch_state
.previous_default
= NULL
;
6682 /* Initalize is_fallthru state to false.
6684 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6685 state
->switch_state
.is_fallthru_var
=
6686 new(ctx
) ir_variable(glsl_type::bool_type
,
6687 "switch_is_fallthru_tmp",
6689 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6691 ir_dereference_variable
*deref_is_fallthru_var
=
6692 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6693 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6696 /* Initialize continue_inside state to false.
6698 state
->switch_state
.continue_inside
=
6699 new(ctx
) ir_variable(glsl_type::bool_type
,
6700 "continue_inside_tmp",
6702 instructions
->push_tail(state
->switch_state
.continue_inside
);
6704 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6705 ir_dereference_variable
*deref_continue_inside_var
=
6706 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6707 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6710 state
->switch_state
.run_default
=
6711 new(ctx
) ir_variable(glsl_type::bool_type
,
6714 instructions
->push_tail(state
->switch_state
.run_default
);
6716 /* Loop around the switch is used for flow control. */
6717 ir_loop
* loop
= new(ctx
) ir_loop();
6718 instructions
->push_tail(loop
);
6720 /* Cache test expression.
6722 test_to_hir(&loop
->body_instructions
, state
);
6724 /* Emit code for body of switch stmt.
6726 body
->hir(&loop
->body_instructions
, state
);
6728 /* Insert a break at the end to exit loop. */
6729 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6730 loop
->body_instructions
.push_tail(jump
);
6732 /* If we are inside loop, check if continue got called inside switch. */
6733 if (state
->loop_nesting_ast
!= NULL
) {
6734 ir_dereference_variable
*deref_continue_inside
=
6735 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6736 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6737 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6739 if (state
->loop_nesting_ast
!= NULL
) {
6740 if (state
->loop_nesting_ast
->rest_expression
) {
6741 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6744 if (state
->loop_nesting_ast
->mode
==
6745 ast_iteration_statement::ast_do_while
) {
6746 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6749 irif
->then_instructions
.push_tail(jump
);
6750 instructions
->push_tail(irif
);
6753 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6755 state
->switch_state
= saved
;
6757 /* Switch statements do not have r-values. */
6763 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6764 struct _mesa_glsl_parse_state
*state
)
6768 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6769 * on the switch test case. The first one would be already raised when
6770 * getting the test_expression at ast_switch_statement::hir
6772 test_expression
->set_is_lhs(true);
6773 /* Cache value of test expression. */
6774 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6776 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6779 ir_dereference_variable
*deref_test_var
=
6780 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6782 instructions
->push_tail(state
->switch_state
.test_var
);
6783 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6788 ast_switch_body::hir(exec_list
*instructions
,
6789 struct _mesa_glsl_parse_state
*state
)
6792 stmts
->hir(instructions
, state
);
6794 /* Switch bodies do not have r-values. */
6799 ast_case_statement_list::hir(exec_list
*instructions
,
6800 struct _mesa_glsl_parse_state
*state
)
6802 exec_list default_case
, after_default
, tmp
;
6804 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6805 case_stmt
->hir(&tmp
, state
);
6808 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6809 default_case
.append_list(&tmp
);
6813 /* If default case found, append 'after_default' list. */
6814 if (!default_case
.is_empty())
6815 after_default
.append_list(&tmp
);
6817 instructions
->append_list(&tmp
);
6820 /* Handle the default case. This is done here because default might not be
6821 * the last case. We need to add checks against following cases first to see
6822 * if default should be chosen or not.
6824 if (!default_case
.is_empty()) {
6825 ir_factory
body(instructions
, state
);
6827 ir_expression
*cmp
= NULL
;
6829 hash_table_foreach(state
->switch_state
.labels_ht
, entry
) {
6830 const struct case_label
*const l
= (struct case_label
*) entry
->data
;
6832 /* If the switch init-value is the value of one of the labels that
6833 * occurs after the default case, disable execution of the default
6836 if (l
->after_default
) {
6837 ir_constant
*const cnst
=
6838 state
->switch_state
.test_var
->type
->base_type
== GLSL_TYPE_UINT
6839 ? body
.constant(unsigned(l
->value
))
6840 : body
.constant(int(l
->value
));
6843 ? equal(cnst
, state
->switch_state
.test_var
)
6844 : logic_or(cmp
, equal(cnst
, state
->switch_state
.test_var
));
6849 body
.emit(assign(state
->switch_state
.run_default
, logic_not(cmp
)));
6851 body
.emit(assign(state
->switch_state
.run_default
, body
.constant(true)));
6853 /* Append default case and all cases after it. */
6854 instructions
->append_list(&default_case
);
6855 instructions
->append_list(&after_default
);
6858 /* Case statements do not have r-values. */
6863 ast_case_statement::hir(exec_list
*instructions
,
6864 struct _mesa_glsl_parse_state
*state
)
6866 labels
->hir(instructions
, state
);
6868 /* Guard case statements depending on fallthru state. */
6869 ir_dereference_variable
*const deref_fallthru_guard
=
6870 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6871 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6873 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6874 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6876 instructions
->push_tail(test_fallthru
);
6878 /* Case statements do not have r-values. */
6884 ast_case_label_list::hir(exec_list
*instructions
,
6885 struct _mesa_glsl_parse_state
*state
)
6887 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6888 label
->hir(instructions
, state
);
6890 /* Case labels do not have r-values. */
6895 ast_case_label::hir(exec_list
*instructions
,
6896 struct _mesa_glsl_parse_state
*state
)
6898 ir_factory
body(instructions
, state
);
6900 ir_variable
*const fallthru_var
= state
->switch_state
.is_fallthru_var
;
6902 /* If not default case, ... */
6903 if (this->test_value
!= NULL
) {
6904 /* Conditionally set fallthru state based on
6905 * comparison of cached test expression value to case label.
6907 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6908 ir_constant
*label_const
=
6909 label_rval
->constant_expression_value(body
.mem_ctx
);
6912 YYLTYPE loc
= this->test_value
->get_location();
6914 _mesa_glsl_error(& loc
, state
,
6915 "switch statement case label must be a "
6916 "constant expression");
6918 /* Stuff a dummy value in to allow processing to continue. */
6919 label_const
= body
.constant(0);
6922 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6923 &label_const
->value
.u
[0]);
6926 const struct case_label
*const l
=
6927 (struct case_label
*) entry
->data
;
6928 const ast_expression
*const previous_label
= l
->ast
;
6929 YYLTYPE loc
= this->test_value
->get_location();
6931 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6933 loc
= previous_label
->get_location();
6934 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6936 struct case_label
*l
= ralloc(state
->switch_state
.labels_ht
,
6939 l
->value
= label_const
->value
.u
[0];
6940 l
->after_default
= state
->switch_state
.previous_default
!= NULL
;
6941 l
->ast
= this->test_value
;
6943 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6944 &label_const
->value
.u
[0],
6949 /* Create an r-value version of the ir_constant label here (after we may
6950 * have created a fake one in error cases) that can be passed to
6951 * apply_implicit_conversion below.
6953 ir_rvalue
*label
= label_const
;
6955 ir_rvalue
*deref_test_var
=
6956 new(body
.mem_ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6959 * From GLSL 4.40 specification section 6.2 ("Selection"):
6961 * "The type of the init-expression value in a switch statement must
6962 * be a scalar int or uint. The type of the constant-expression value
6963 * in a case label also must be a scalar int or uint. When any pair
6964 * of these values is tested for "equal value" and the types do not
6965 * match, an implicit conversion will be done to convert the int to a
6966 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6969 if (label
->type
!= state
->switch_state
.test_var
->type
) {
6970 YYLTYPE loc
= this->test_value
->get_location();
6972 const glsl_type
*type_a
= label
->type
;
6973 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6975 /* Check if int->uint implicit conversion is supported. */
6976 bool integer_conversion_supported
=
6977 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6980 if ((!type_a
->is_integer_32() || !type_b
->is_integer_32()) ||
6981 !integer_conversion_supported
) {
6982 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6983 "init-expression and case label (%s != %s)",
6984 type_a
->name
, type_b
->name
);
6986 /* Conversion of the case label. */
6987 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6988 if (!apply_implicit_conversion(glsl_type::uint_type
,
6990 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6992 /* Conversion of the init-expression value. */
6993 if (!apply_implicit_conversion(glsl_type::uint_type
,
6994 deref_test_var
, state
))
6995 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6999 /* If the implicit conversion was allowed, the types will already be
7000 * the same. If the implicit conversion wasn't allowed, smash the
7001 * type of the label anyway. This will prevent the expression
7002 * constructor (below) from failing an assertion.
7004 label
->type
= deref_test_var
->type
;
7007 body
.emit(assign(fallthru_var
,
7008 logic_or(fallthru_var
, equal(label
, deref_test_var
))));
7009 } else { /* default case */
7010 if (state
->switch_state
.previous_default
) {
7011 YYLTYPE loc
= this->get_location();
7012 _mesa_glsl_error(& loc
, state
,
7013 "multiple default labels in one switch");
7015 loc
= state
->switch_state
.previous_default
->get_location();
7016 _mesa_glsl_error(& loc
, state
, "this is the first default label");
7018 state
->switch_state
.previous_default
= this;
7020 /* Set fallthru condition on 'run_default' bool. */
7021 body
.emit(assign(fallthru_var
,
7022 logic_or(fallthru_var
,
7023 state
->switch_state
.run_default
)));
7026 /* Case statements do not have r-values. */
7031 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
7032 struct _mesa_glsl_parse_state
*state
)
7036 if (condition
!= NULL
) {
7037 ir_rvalue
*const cond
=
7038 condition
->hir(instructions
, state
);
7041 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
7042 YYLTYPE loc
= condition
->get_location();
7044 _mesa_glsl_error(& loc
, state
,
7045 "loop condition must be scalar boolean");
7047 /* As the first code in the loop body, generate a block that looks
7048 * like 'if (!condition) break;' as the loop termination condition.
7050 ir_rvalue
*const not_cond
=
7051 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
7053 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
7055 ir_jump
*const break_stmt
=
7056 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
7058 if_stmt
->then_instructions
.push_tail(break_stmt
);
7059 instructions
->push_tail(if_stmt
);
7066 ast_iteration_statement::hir(exec_list
*instructions
,
7067 struct _mesa_glsl_parse_state
*state
)
7071 /* For-loops and while-loops start a new scope, but do-while loops do not.
7073 if (mode
!= ast_do_while
)
7074 state
->symbols
->push_scope();
7076 if (init_statement
!= NULL
)
7077 init_statement
->hir(instructions
, state
);
7079 ir_loop
*const stmt
= new(ctx
) ir_loop();
7080 instructions
->push_tail(stmt
);
7082 /* Track the current loop nesting. */
7083 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
7085 state
->loop_nesting_ast
= this;
7087 /* Likewise, indicate that following code is closest to a loop,
7088 * NOT closest to a switch.
7090 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
7091 state
->switch_state
.is_switch_innermost
= false;
7093 if (mode
!= ast_do_while
)
7094 condition_to_hir(&stmt
->body_instructions
, state
);
7097 body
->hir(& stmt
->body_instructions
, state
);
7099 if (rest_expression
!= NULL
)
7100 rest_expression
->hir(& stmt
->body_instructions
, state
);
7102 if (mode
== ast_do_while
)
7103 condition_to_hir(&stmt
->body_instructions
, state
);
7105 if (mode
!= ast_do_while
)
7106 state
->symbols
->pop_scope();
7108 /* Restore previous nesting before returning. */
7109 state
->loop_nesting_ast
= nesting_ast
;
7110 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
7112 /* Loops do not have r-values.
7119 * Determine if the given type is valid for establishing a default precision
7122 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
7124 * "The precision statement
7126 * precision precision-qualifier type;
7128 * can be used to establish a default precision qualifier. The type field
7129 * can be either int or float or any of the sampler types, and the
7130 * precision-qualifier can be lowp, mediump, or highp."
7132 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
7133 * qualifiers on sampler types, but this seems like an oversight (since the
7134 * intention of including these in GLSL 1.30 is to allow compatibility with ES
7135 * shaders). So we allow int, float, and all sampler types regardless of GLSL
7139 is_valid_default_precision_type(const struct glsl_type
*const type
)
7144 switch (type
->base_type
) {
7146 case GLSL_TYPE_FLOAT
:
7147 /* "int" and "float" are valid, but vectors and matrices are not. */
7148 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
7149 case GLSL_TYPE_SAMPLER
:
7150 case GLSL_TYPE_IMAGE
:
7151 case GLSL_TYPE_ATOMIC_UINT
:
7160 ast_type_specifier::hir(exec_list
*instructions
,
7161 struct _mesa_glsl_parse_state
*state
)
7163 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
7166 YYLTYPE loc
= this->get_location();
7168 /* If this is a precision statement, check that the type to which it is
7169 * applied is either float or int.
7171 * From section 4.5.3 of the GLSL 1.30 spec:
7172 * "The precision statement
7173 * precision precision-qualifier type;
7174 * can be used to establish a default precision qualifier. The type
7175 * field can be either int or float [...]. Any other types or
7176 * qualifiers will result in an error.
7178 if (this->default_precision
!= ast_precision_none
) {
7179 if (!state
->check_precision_qualifiers_allowed(&loc
))
7182 if (this->structure
!= NULL
) {
7183 _mesa_glsl_error(&loc
, state
,
7184 "precision qualifiers do not apply to structures");
7188 if (this->array_specifier
!= NULL
) {
7189 _mesa_glsl_error(&loc
, state
,
7190 "default precision statements do not apply to "
7195 const struct glsl_type
*const type
=
7196 state
->symbols
->get_type(this->type_name
);
7197 if (!is_valid_default_precision_type(type
)) {
7198 _mesa_glsl_error(&loc
, state
,
7199 "default precision statements apply only to "
7200 "float, int, and opaque types");
7204 if (state
->es_shader
) {
7205 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
7208 * "Non-precision qualified declarations will use the precision
7209 * qualifier specified in the most recent precision statement
7210 * that is still in scope. The precision statement has the same
7211 * scoping rules as variable declarations. If it is declared
7212 * inside a compound statement, its effect stops at the end of
7213 * the innermost statement it was declared in. Precision
7214 * statements in nested scopes override precision statements in
7215 * outer scopes. Multiple precision statements for the same basic
7216 * type can appear inside the same scope, with later statements
7217 * overriding earlier statements within that scope."
7219 * Default precision specifications follow the same scope rules as
7220 * variables. So, we can track the state of the default precision
7221 * qualifiers in the symbol table, and the rules will just work. This
7222 * is a slight abuse of the symbol table, but it has the semantics
7225 state
->symbols
->add_default_precision_qualifier(this->type_name
,
7226 this->default_precision
);
7229 /* FINISHME: Translate precision statements into IR. */
7233 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
7234 * process_record_constructor() can do type-checking on C-style initializer
7235 * expressions of structs, but ast_struct_specifier should only be translated
7236 * to HIR if it is declaring the type of a structure.
7238 * The ->is_declaration field is false for initializers of variables
7239 * declared separately from the struct's type definition.
7241 * struct S { ... }; (is_declaration = true)
7242 * struct T { ... } t = { ... }; (is_declaration = true)
7243 * S s = { ... }; (is_declaration = false)
7245 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
7246 return this->structure
->hir(instructions
, state
);
7253 * Process a structure or interface block tree into an array of structure fields
7255 * After parsing, where there are some syntax differnces, structures and
7256 * interface blocks are almost identical. They are similar enough that the
7257 * AST for each can be processed the same way into a set of
7258 * \c glsl_struct_field to describe the members.
7260 * If we're processing an interface block, var_mode should be the type of the
7261 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
7262 * ir_var_shader_storage). If we're processing a structure, var_mode should be
7266 * The number of fields processed. A pointer to the array structure fields is
7267 * stored in \c *fields_ret.
7270 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
7271 struct _mesa_glsl_parse_state
*state
,
7272 exec_list
*declarations
,
7273 glsl_struct_field
**fields_ret
,
7275 enum glsl_matrix_layout matrix_layout
,
7276 bool allow_reserved_names
,
7277 ir_variable_mode var_mode
,
7278 ast_type_qualifier
*layout
,
7279 unsigned block_stream
,
7280 unsigned block_xfb_buffer
,
7281 unsigned block_xfb_offset
,
7282 unsigned expl_location
,
7283 unsigned expl_align
)
7285 unsigned decl_count
= 0;
7286 unsigned next_offset
= 0;
7288 /* Make an initial pass over the list of fields to determine how
7289 * many there are. Each element in this list is an ast_declarator_list.
7290 * This means that we actually need to count the number of elements in the
7291 * 'declarations' list in each of the elements.
7293 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7294 decl_count
+= decl_list
->declarations
.length();
7297 /* Allocate storage for the fields and process the field
7298 * declarations. As the declarations are processed, try to also convert
7299 * the types to HIR. This ensures that structure definitions embedded in
7300 * other structure definitions or in interface blocks are processed.
7302 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
7305 bool first_member
= true;
7306 bool first_member_has_explicit_location
= false;
7309 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7310 const char *type_name
;
7311 YYLTYPE loc
= decl_list
->get_location();
7313 decl_list
->type
->specifier
->hir(instructions
, state
);
7315 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
7317 * "Anonymous structures are not supported; so embedded structures
7318 * must have a declarator. A name given to an embedded struct is
7319 * scoped at the same level as the struct it is embedded in."
7321 * The same section of the GLSL 1.20 spec says:
7323 * "Anonymous structures are not supported. Embedded structures are
7326 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
7327 * embedded structures in 1.10 only.
7329 if (state
->language_version
!= 110 &&
7330 decl_list
->type
->specifier
->structure
!= NULL
)
7331 _mesa_glsl_error(&loc
, state
,
7332 "embedded structure declarations are not allowed");
7334 const glsl_type
*decl_type
=
7335 decl_list
->type
->glsl_type(& type_name
, state
);
7337 const struct ast_type_qualifier
*const qual
=
7338 &decl_list
->type
->qualifier
;
7340 /* From section 4.3.9 of the GLSL 4.40 spec:
7342 * "[In interface blocks] opaque types are not allowed."
7344 * It should be impossible for decl_type to be NULL here. Cases that
7345 * might naturally lead to decl_type being NULL, especially for the
7346 * is_interface case, will have resulted in compilation having
7347 * already halted due to a syntax error.
7352 /* From section 4.3.7 of the ARB_bindless_texture spec:
7354 * "(remove the following bullet from the last list on p. 39,
7355 * thereby permitting sampler types in interface blocks; image
7356 * types are also permitted in blocks by this extension)"
7358 * * sampler types are not allowed
7360 if (decl_type
->contains_atomic() ||
7361 (!state
->has_bindless() && decl_type
->contains_opaque())) {
7362 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
7363 "interface block contains %s variable",
7364 state
->has_bindless() ? "atomic" : "opaque");
7367 if (decl_type
->contains_atomic()) {
7368 /* From section 4.1.7.3 of the GLSL 4.40 spec:
7370 * "Members of structures cannot be declared as atomic counter
7373 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
7376 if (!state
->has_bindless() && decl_type
->contains_image()) {
7377 /* FINISHME: Same problem as with atomic counters.
7378 * FINISHME: Request clarification from Khronos and add
7379 * FINISHME: spec quotation here.
7381 _mesa_glsl_error(&loc
, state
, "image in structure");
7385 if (qual
->flags
.q
.explicit_binding
) {
7386 _mesa_glsl_error(&loc
, state
,
7387 "binding layout qualifier cannot be applied "
7388 "to struct or interface block members");
7392 if (!first_member
) {
7393 if (!layout
->flags
.q
.explicit_location
&&
7394 ((first_member_has_explicit_location
&&
7395 !qual
->flags
.q
.explicit_location
) ||
7396 (!first_member_has_explicit_location
&&
7397 qual
->flags
.q
.explicit_location
))) {
7398 _mesa_glsl_error(&loc
, state
,
7399 "when block-level location layout qualifier "
7400 "is not supplied either all members must "
7401 "have a location layout qualifier or all "
7402 "members must not have a location layout "
7406 first_member
= false;
7407 first_member_has_explicit_location
=
7408 qual
->flags
.q
.explicit_location
;
7412 if (qual
->flags
.q
.std140
||
7413 qual
->flags
.q
.std430
||
7414 qual
->flags
.q
.packed
||
7415 qual
->flags
.q
.shared
) {
7416 _mesa_glsl_error(&loc
, state
,
7417 "uniform/shader storage block layout qualifiers "
7418 "std140, std430, packed, and shared can only be "
7419 "applied to uniform/shader storage blocks, not "
7423 if (qual
->flags
.q
.constant
) {
7424 _mesa_glsl_error(&loc
, state
,
7425 "const storage qualifier cannot be applied "
7426 "to struct or interface block members");
7429 validate_memory_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7430 validate_image_format_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7432 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
7434 * "A block member may be declared with a stream identifier, but
7435 * the specified stream must match the stream associated with the
7436 * containing block."
7438 if (qual
->flags
.q
.explicit_stream
) {
7439 unsigned qual_stream
;
7440 if (process_qualifier_constant(state
, &loc
, "stream",
7441 qual
->stream
, &qual_stream
) &&
7442 qual_stream
!= block_stream
) {
7443 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
7444 "interface block member does not match "
7445 "the interface block (%u vs %u)", qual_stream
,
7451 unsigned explicit_xfb_buffer
= 0;
7452 if (qual
->flags
.q
.explicit_xfb_buffer
) {
7453 unsigned qual_xfb_buffer
;
7454 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
7455 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
7456 explicit_xfb_buffer
= 1;
7457 if (qual_xfb_buffer
!= block_xfb_buffer
)
7458 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
7459 "interface block member does not match "
7460 "the interface block (%u vs %u)",
7461 qual_xfb_buffer
, block_xfb_buffer
);
7463 xfb_buffer
= (int) qual_xfb_buffer
;
7466 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
7467 xfb_buffer
= (int) block_xfb_buffer
;
7470 int xfb_stride
= -1;
7471 if (qual
->flags
.q
.explicit_xfb_stride
) {
7472 unsigned qual_xfb_stride
;
7473 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
7474 qual
->xfb_stride
, &qual_xfb_stride
)) {
7475 xfb_stride
= (int) qual_xfb_stride
;
7479 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
7480 _mesa_glsl_error(&loc
, state
,
7481 "interpolation qualifiers cannot be used "
7482 "with uniform interface blocks");
7485 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
7486 qual
->has_auxiliary_storage()) {
7487 _mesa_glsl_error(&loc
, state
,
7488 "auxiliary storage qualifiers cannot be used "
7489 "in uniform blocks or structures.");
7492 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
7493 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
7494 _mesa_glsl_error(&loc
, state
,
7495 "row_major and column_major can only be "
7496 "applied to interface blocks");
7498 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
7501 foreach_list_typed (ast_declaration
, decl
, link
,
7502 &decl_list
->declarations
) {
7503 YYLTYPE loc
= decl
->get_location();
7505 if (!allow_reserved_names
)
7506 validate_identifier(decl
->identifier
, loc
, state
);
7508 const struct glsl_type
*field_type
=
7509 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
7510 validate_array_dimensions(field_type
, state
, &loc
);
7511 fields
[i
].type
= field_type
;
7512 fields
[i
].name
= decl
->identifier
;
7513 fields
[i
].interpolation
=
7514 interpret_interpolation_qualifier(qual
, field_type
,
7515 var_mode
, state
, &loc
);
7516 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
7517 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
7518 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
7519 fields
[i
].offset
= -1;
7520 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
7521 fields
[i
].xfb_buffer
= xfb_buffer
;
7522 fields
[i
].xfb_stride
= xfb_stride
;
7524 if (qual
->flags
.q
.explicit_location
) {
7525 unsigned qual_location
;
7526 if (process_qualifier_constant(state
, &loc
, "location",
7527 qual
->location
, &qual_location
)) {
7528 fields
[i
].location
= qual_location
+
7529 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
7530 expl_location
= fields
[i
].location
+
7531 fields
[i
].type
->count_attribute_slots(false);
7534 if (layout
&& layout
->flags
.q
.explicit_location
) {
7535 fields
[i
].location
= expl_location
;
7536 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
7538 fields
[i
].location
= -1;
7542 /* Offset can only be used with std430 and std140 layouts an initial
7543 * value of 0 is used for error detection.
7549 if (qual
->flags
.q
.row_major
||
7550 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7556 if(layout
->flags
.q
.std140
) {
7557 align
= field_type
->std140_base_alignment(row_major
);
7558 size
= field_type
->std140_size(row_major
);
7559 } else if (layout
->flags
.q
.std430
) {
7560 align
= field_type
->std430_base_alignment(row_major
);
7561 size
= field_type
->std430_size(row_major
);
7565 if (qual
->flags
.q
.explicit_offset
) {
7566 unsigned qual_offset
;
7567 if (process_qualifier_constant(state
, &loc
, "offset",
7568 qual
->offset
, &qual_offset
)) {
7569 if (align
!= 0 && size
!= 0) {
7570 if (next_offset
> qual_offset
)
7571 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7572 "offset overlaps previous member");
7574 if (qual_offset
% align
) {
7575 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7576 "must be a multiple of the base "
7577 "alignment of %s", field_type
->name
);
7579 fields
[i
].offset
= qual_offset
;
7580 next_offset
= qual_offset
+ size
;
7582 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7583 "with std430 and std140 layouts");
7588 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7589 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7591 if (align
== 0 || size
== 0) {
7592 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7593 "std430 and std140 layouts");
7594 } else if (qual
->flags
.q
.explicit_align
) {
7595 unsigned member_align
;
7596 if (process_qualifier_constant(state
, &loc
, "align",
7597 qual
->align
, &member_align
)) {
7598 if (member_align
== 0 ||
7599 member_align
& (member_align
- 1)) {
7600 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7601 "is not a power of 2");
7603 fields
[i
].offset
= glsl_align(offset
, member_align
);
7604 next_offset
= fields
[i
].offset
+ size
;
7608 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7609 next_offset
= fields
[i
].offset
+ size
;
7611 } else if (!qual
->flags
.q
.explicit_offset
) {
7612 if (align
!= 0 && size
!= 0)
7613 next_offset
= glsl_align(next_offset
, align
) + size
;
7616 /* From the ARB_enhanced_layouts spec:
7618 * "The given offset applies to the first component of the first
7619 * member of the qualified entity. Then, within the qualified
7620 * entity, subsequent components are each assigned, in order, to
7621 * the next available offset aligned to a multiple of that
7622 * component's size. Aggregate types are flattened down to the
7623 * component level to get this sequence of components."
7625 if (qual
->flags
.q
.explicit_xfb_offset
) {
7626 unsigned xfb_offset
;
7627 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7628 qual
->offset
, &xfb_offset
)) {
7629 fields
[i
].offset
= xfb_offset
;
7630 block_xfb_offset
= fields
[i
].offset
+
7631 4 * field_type
->component_slots();
7634 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7635 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7636 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7637 block_xfb_offset
+= 4 * field_type
->component_slots();
7641 /* Propogate row- / column-major information down the fields of the
7642 * structure or interface block. Structures need this data because
7643 * the structure may contain a structure that contains ... a matrix
7644 * that need the proper layout.
7646 if (is_interface
&& layout
&&
7647 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7648 (field_type
->without_array()->is_matrix()
7649 || field_type
->without_array()->is_struct())) {
7650 /* If no layout is specified for the field, inherit the layout
7653 fields
[i
].matrix_layout
= matrix_layout
;
7655 if (qual
->flags
.q
.row_major
)
7656 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7657 else if (qual
->flags
.q
.column_major
)
7658 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7660 /* If we're processing an uniform or buffer block, the matrix
7661 * layout must be decided by this point.
7663 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7664 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7667 /* Memory qualifiers are allowed on buffer and image variables, while
7668 * the format qualifier is only accepted for images.
7670 if (var_mode
== ir_var_shader_storage
||
7671 field_type
->without_array()->is_image()) {
7672 /* For readonly and writeonly qualifiers the field definition,
7673 * if set, overwrites the layout qualifier.
7675 if (qual
->flags
.q
.read_only
|| qual
->flags
.q
.write_only
) {
7676 fields
[i
].memory_read_only
= qual
->flags
.q
.read_only
;
7677 fields
[i
].memory_write_only
= qual
->flags
.q
.write_only
;
7679 fields
[i
].memory_read_only
=
7680 layout
? layout
->flags
.q
.read_only
: 0;
7681 fields
[i
].memory_write_only
=
7682 layout
? layout
->flags
.q
.write_only
: 0;
7685 /* For other qualifiers, we set the flag if either the layout
7686 * qualifier or the field qualifier are set
7688 fields
[i
].memory_coherent
= qual
->flags
.q
.coherent
||
7689 (layout
&& layout
->flags
.q
.coherent
);
7690 fields
[i
].memory_volatile
= qual
->flags
.q
._volatile
||
7691 (layout
&& layout
->flags
.q
._volatile
);
7692 fields
[i
].memory_restrict
= qual
->flags
.q
.restrict_flag
||
7693 (layout
&& layout
->flags
.q
.restrict_flag
);
7695 if (field_type
->without_array()->is_image()) {
7696 if (qual
->flags
.q
.explicit_image_format
) {
7697 if (qual
->image_base_type
!=
7698 field_type
->without_array()->sampled_type
) {
7699 _mesa_glsl_error(&loc
, state
, "format qualifier doesn't "
7700 "match the base data type of the image");
7703 fields
[i
].image_format
= qual
->image_format
;
7705 if (!qual
->flags
.q
.write_only
) {
7706 _mesa_glsl_error(&loc
, state
, "image not qualified with "
7707 "`writeonly' must have a format layout "
7711 fields
[i
].image_format
= PIPE_FORMAT_NONE
;
7716 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
7717 if (state
->es_shader
) {
7718 fields
[i
].precision
= select_gles_precision(qual
->precision
,
7723 fields
[i
].precision
= qual
->precision
;
7730 assert(i
== decl_count
);
7732 *fields_ret
= fields
;
7738 ast_struct_specifier::hir(exec_list
*instructions
,
7739 struct _mesa_glsl_parse_state
*state
)
7741 YYLTYPE loc
= this->get_location();
7743 unsigned expl_location
= 0;
7744 if (layout
&& layout
->flags
.q
.explicit_location
) {
7745 if (!process_qualifier_constant(state
, &loc
, "location",
7746 layout
->location
, &expl_location
)) {
7749 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7753 glsl_struct_field
*fields
;
7754 unsigned decl_count
=
7755 ast_process_struct_or_iface_block_members(instructions
,
7757 &this->declarations
,
7760 GLSL_MATRIX_LAYOUT_INHERITED
,
7761 false /* allow_reserved_names */,
7764 0, /* for interface only */
7765 0, /* for interface only */
7766 0, /* for interface only */
7768 0 /* for interface only */);
7770 validate_identifier(this->name
, loc
, state
);
7772 type
= glsl_type::get_struct_instance(fields
, decl_count
, this->name
);
7774 if (!type
->is_anonymous() && !state
->symbols
->add_type(name
, type
)) {
7775 const glsl_type
*match
= state
->symbols
->get_type(name
);
7776 /* allow struct matching for desktop GL - older UE4 does this */
7777 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(type
, true, false))
7778 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7780 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7782 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7784 state
->num_user_structures
+ 1);
7786 s
[state
->num_user_structures
] = type
;
7787 state
->user_structures
= s
;
7788 state
->num_user_structures
++;
7792 /* Structure type definitions do not have r-values.
7799 * Visitor class which detects whether a given interface block has been used.
7801 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7804 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7805 : mode(mode
), block(block
), found(false)
7809 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7811 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7815 return visit_continue
;
7818 bool usage_found() const
7824 ir_variable_mode mode
;
7825 const glsl_type
*block
;
7830 is_unsized_array_last_element(ir_variable
*v
)
7832 const glsl_type
*interface_type
= v
->get_interface_type();
7833 int length
= interface_type
->length
;
7835 assert(v
->type
->is_unsized_array());
7837 /* Check if it is the last element of the interface */
7838 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7844 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7846 var
->data
.memory_read_only
= field
.memory_read_only
;
7847 var
->data
.memory_write_only
= field
.memory_write_only
;
7848 var
->data
.memory_coherent
= field
.memory_coherent
;
7849 var
->data
.memory_volatile
= field
.memory_volatile
;
7850 var
->data
.memory_restrict
= field
.memory_restrict
;
7854 ast_interface_block::hir(exec_list
*instructions
,
7855 struct _mesa_glsl_parse_state
*state
)
7857 YYLTYPE loc
= this->get_location();
7859 /* Interface blocks must be declared at global scope */
7860 if (state
->current_function
!= NULL
) {
7861 _mesa_glsl_error(&loc
, state
,
7862 "Interface block `%s' must be declared "
7867 /* Validate qualifiers:
7869 * - Layout Qualifiers as per the table in Section 4.4
7870 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7872 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7875 * "Additionally, memory qualifiers may also be used in the declaration
7876 * of shader storage blocks"
7878 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7879 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7880 * Layout Qualifiers) of the GLSL 4.50 spec says:
7882 * "The std430 qualifier is supported only for shader storage blocks;
7883 * using std430 on a uniform block will result in a compile-time error."
7885 ast_type_qualifier allowed_blk_qualifiers
;
7886 allowed_blk_qualifiers
.flags
.i
= 0;
7887 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7888 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7889 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7890 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7891 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7892 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7893 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7894 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7895 if (this->layout
.flags
.q
.buffer
) {
7896 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7897 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7898 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7899 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7900 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7901 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7902 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7904 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7907 /* Interface block */
7908 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7910 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7911 if (this->layout
.flags
.q
.out
) {
7912 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7913 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7914 state
->stage
== MESA_SHADER_TESS_CTRL
||
7915 state
->stage
== MESA_SHADER_TESS_EVAL
||
7916 state
->stage
== MESA_SHADER_VERTEX
) {
7917 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7918 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7919 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7920 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7921 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7922 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7923 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7924 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7926 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7927 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7931 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7932 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7933 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7938 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7939 "invalid qualifier for block",
7942 enum glsl_interface_packing packing
;
7943 if (this->layout
.flags
.q
.std140
) {
7944 packing
= GLSL_INTERFACE_PACKING_STD140
;
7945 } else if (this->layout
.flags
.q
.packed
) {
7946 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7947 } else if (this->layout
.flags
.q
.std430
) {
7948 packing
= GLSL_INTERFACE_PACKING_STD430
;
7950 /* The default layout is shared.
7952 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7955 ir_variable_mode var_mode
;
7956 const char *iface_type_name
;
7957 if (this->layout
.flags
.q
.in
) {
7958 var_mode
= ir_var_shader_in
;
7959 iface_type_name
= "in";
7960 } else if (this->layout
.flags
.q
.out
) {
7961 var_mode
= ir_var_shader_out
;
7962 iface_type_name
= "out";
7963 } else if (this->layout
.flags
.q
.uniform
) {
7964 var_mode
= ir_var_uniform
;
7965 iface_type_name
= "uniform";
7966 } else if (this->layout
.flags
.q
.buffer
) {
7967 var_mode
= ir_var_shader_storage
;
7968 iface_type_name
= "buffer";
7970 var_mode
= ir_var_auto
;
7971 iface_type_name
= "UNKNOWN";
7972 assert(!"interface block layout qualifier not found!");
7975 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7976 if (this->layout
.flags
.q
.row_major
)
7977 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7978 else if (this->layout
.flags
.q
.column_major
)
7979 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7981 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7982 exec_list declared_variables
;
7983 glsl_struct_field
*fields
;
7985 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7986 * that we don't have incompatible qualifiers
7988 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7989 _mesa_glsl_error(&loc
, state
,
7990 "Interface block sets both readonly and writeonly");
7993 unsigned qual_stream
;
7994 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7996 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7997 /* If the stream qualifier is invalid it doesn't make sense to continue
7998 * on and try to compare stream layouts on member variables against it
7999 * so just return early.
8004 unsigned qual_xfb_buffer
;
8005 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
8006 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
8007 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
8011 unsigned qual_xfb_offset
;
8012 if (layout
.flags
.q
.explicit_xfb_offset
) {
8013 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
8014 layout
.offset
, &qual_xfb_offset
)) {
8019 unsigned qual_xfb_stride
;
8020 if (layout
.flags
.q
.explicit_xfb_stride
) {
8021 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
8022 layout
.xfb_stride
, &qual_xfb_stride
)) {
8027 unsigned expl_location
= 0;
8028 if (layout
.flags
.q
.explicit_location
) {
8029 if (!process_qualifier_constant(state
, &loc
, "location",
8030 layout
.location
, &expl_location
)) {
8033 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
8034 : VARYING_SLOT_VAR0
;
8038 unsigned expl_align
= 0;
8039 if (layout
.flags
.q
.explicit_align
) {
8040 if (!process_qualifier_constant(state
, &loc
, "align",
8041 layout
.align
, &expl_align
)) {
8044 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
8045 _mesa_glsl_error(&loc
, state
, "align layout qualifier is not a "
8052 unsigned int num_variables
=
8053 ast_process_struct_or_iface_block_members(&declared_variables
,
8055 &this->declarations
,
8059 redeclaring_per_vertex
,
8068 if (!redeclaring_per_vertex
) {
8069 validate_identifier(this->block_name
, loc
, state
);
8071 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
8073 * "Block names have no other use within a shader beyond interface
8074 * matching; it is a compile-time error to use a block name at global
8075 * scope for anything other than as a block name."
8077 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
8078 if (var
&& !var
->type
->is_interface()) {
8079 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
8080 "already used in the scope.",
8085 const glsl_type
*earlier_per_vertex
= NULL
;
8086 if (redeclaring_per_vertex
) {
8087 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
8088 * the named interface block gl_in, we can find it by looking at the
8089 * previous declaration of gl_in. Otherwise we can find it by looking
8090 * at the previous decalartion of any of the built-in outputs,
8093 * Also check that the instance name and array-ness of the redeclaration
8097 case ir_var_shader_in
:
8098 if (ir_variable
*earlier_gl_in
=
8099 state
->symbols
->get_variable("gl_in")) {
8100 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
8102 _mesa_glsl_error(&loc
, state
,
8103 "redeclaration of gl_PerVertex input not allowed "
8105 _mesa_shader_stage_to_string(state
->stage
));
8107 if (this->instance_name
== NULL
||
8108 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
8109 !this->array_specifier
->is_single_dimension()) {
8110 _mesa_glsl_error(&loc
, state
,
8111 "gl_PerVertex input must be redeclared as "
8115 case ir_var_shader_out
:
8116 if (ir_variable
*earlier_gl_Position
=
8117 state
->symbols
->get_variable("gl_Position")) {
8118 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
8119 } else if (ir_variable
*earlier_gl_out
=
8120 state
->symbols
->get_variable("gl_out")) {
8121 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
8123 _mesa_glsl_error(&loc
, state
,
8124 "redeclaration of gl_PerVertex output not "
8125 "allowed in the %s shader",
8126 _mesa_shader_stage_to_string(state
->stage
));
8128 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
8129 if (this->instance_name
== NULL
||
8130 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
8131 _mesa_glsl_error(&loc
, state
,
8132 "gl_PerVertex output must be redeclared as "
8136 if (this->instance_name
!= NULL
) {
8137 _mesa_glsl_error(&loc
, state
,
8138 "gl_PerVertex output may not be redeclared with "
8139 "an instance name");
8144 _mesa_glsl_error(&loc
, state
,
8145 "gl_PerVertex must be declared as an input or an "
8150 if (earlier_per_vertex
== NULL
) {
8151 /* An error has already been reported. Bail out to avoid null
8152 * dereferences later in this function.
8157 /* Copy locations from the old gl_PerVertex interface block. */
8158 for (unsigned i
= 0; i
< num_variables
; i
++) {
8159 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
8161 _mesa_glsl_error(&loc
, state
,
8162 "redeclaration of gl_PerVertex must be a subset "
8163 "of the built-in members of gl_PerVertex");
8165 fields
[i
].location
=
8166 earlier_per_vertex
->fields
.structure
[j
].location
;
8168 earlier_per_vertex
->fields
.structure
[j
].offset
;
8169 fields
[i
].interpolation
=
8170 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
8171 fields
[i
].centroid
=
8172 earlier_per_vertex
->fields
.structure
[j
].centroid
;
8174 earlier_per_vertex
->fields
.structure
[j
].sample
;
8176 earlier_per_vertex
->fields
.structure
[j
].patch
;
8177 fields
[i
].precision
=
8178 earlier_per_vertex
->fields
.structure
[j
].precision
;
8179 fields
[i
].explicit_xfb_buffer
=
8180 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
8181 fields
[i
].xfb_buffer
=
8182 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
8183 fields
[i
].xfb_stride
=
8184 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
8188 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
8191 * If a built-in interface block is redeclared, it must appear in
8192 * the shader before any use of any member included in the built-in
8193 * declaration, or a compilation error will result.
8195 * This appears to be a clarification to the behaviour established for
8196 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
8197 * regardless of GLSL version.
8199 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
8200 v
.run(instructions
);
8201 if (v
.usage_found()) {
8202 _mesa_glsl_error(&loc
, state
,
8203 "redeclaration of a built-in interface block must "
8204 "appear before any use of any member of the "
8209 const glsl_type
*block_type
=
8210 glsl_type::get_interface_instance(fields
,
8214 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
8217 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
8219 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
8220 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
8223 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
8224 YYLTYPE loc
= this->get_location();
8225 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
8226 "already taken in the current scope",
8227 this->block_name
, iface_type_name
);
8230 /* Since interface blocks cannot contain statements, it should be
8231 * impossible for the block to generate any instructions.
8233 assert(declared_variables
.is_empty());
8235 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
8237 * Geometry shader input variables get the per-vertex values written
8238 * out by vertex shader output variables of the same names. Since a
8239 * geometry shader operates on a set of vertices, each input varying
8240 * variable (or input block, see interface blocks below) needs to be
8241 * declared as an array.
8243 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
8244 var_mode
== ir_var_shader_in
) {
8245 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
8246 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8247 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
8248 !this->layout
.flags
.q
.patch
&&
8249 this->array_specifier
== NULL
&&
8250 var_mode
== ir_var_shader_in
) {
8251 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
8252 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
8253 !this->layout
.flags
.q
.patch
&&
8254 this->array_specifier
== NULL
&&
8255 var_mode
== ir_var_shader_out
) {
8256 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
8260 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
8263 * "If an instance name (instance-name) is used, then it puts all the
8264 * members inside a scope within its own name space, accessed with the
8265 * field selector ( . ) operator (analogously to structures)."
8267 if (this->instance_name
) {
8268 if (redeclaring_per_vertex
) {
8269 /* When a built-in in an unnamed interface block is redeclared,
8270 * get_variable_being_redeclared() calls
8271 * check_builtin_array_max_size() to make sure that built-in array
8272 * variables aren't redeclared to illegal sizes. But we're looking
8273 * at a redeclaration of a named built-in interface block. So we
8274 * have to manually call check_builtin_array_max_size() for all parts
8275 * of the interface that are arrays.
8277 for (unsigned i
= 0; i
< num_variables
; i
++) {
8278 if (fields
[i
].type
->is_array()) {
8279 const unsigned size
= fields
[i
].type
->array_size();
8280 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
8284 validate_identifier(this->instance_name
, loc
, state
);
8289 if (this->array_specifier
!= NULL
) {
8290 const glsl_type
*block_array_type
=
8291 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
8293 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
8295 * For uniform blocks declared an array, each individual array
8296 * element corresponds to a separate buffer object backing one
8297 * instance of the block. As the array size indicates the number
8298 * of buffer objects needed, uniform block array declarations
8299 * must specify an array size.
8301 * And a few paragraphs later:
8303 * Geometry shader input blocks must be declared as arrays and
8304 * follow the array declaration and linking rules for all
8305 * geometry shader inputs. All other input and output block
8306 * arrays must specify an array size.
8308 * The same applies to tessellation shaders.
8310 * The upshot of this is that the only circumstance where an
8311 * interface array size *doesn't* need to be specified is on a
8312 * geometry shader input, tessellation control shader input,
8313 * tessellation control shader output, and tessellation evaluation
8316 if (block_array_type
->is_unsized_array()) {
8317 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
8318 state
->stage
== MESA_SHADER_TESS_CTRL
||
8319 state
->stage
== MESA_SHADER_TESS_EVAL
;
8320 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
8322 if (this->layout
.flags
.q
.in
) {
8324 _mesa_glsl_error(&loc
, state
,
8325 "unsized input block arrays not allowed in "
8327 _mesa_shader_stage_to_string(state
->stage
));
8328 } else if (this->layout
.flags
.q
.out
) {
8330 _mesa_glsl_error(&loc
, state
,
8331 "unsized output block arrays not allowed in "
8333 _mesa_shader_stage_to_string(state
->stage
));
8335 /* by elimination, this is a uniform block array */
8336 _mesa_glsl_error(&loc
, state
,
8337 "unsized uniform block arrays not allowed in "
8339 _mesa_shader_stage_to_string(state
->stage
));
8343 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
8345 * * Arrays of arrays of blocks are not allowed
8347 if (state
->es_shader
&& block_array_type
->is_array() &&
8348 block_array_type
->fields
.array
->is_array()) {
8349 _mesa_glsl_error(&loc
, state
,
8350 "arrays of arrays interface blocks are "
8354 var
= new(state
) ir_variable(block_array_type
,
8355 this->instance_name
,
8358 var
= new(state
) ir_variable(block_type
,
8359 this->instance_name
,
8363 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8364 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8366 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8367 var
->data
.read_only
= true;
8369 var
->data
.patch
= this->layout
.flags
.q
.patch
;
8371 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
8372 handle_geometry_shader_input_decl(state
, loc
, var
);
8373 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8374 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
8375 handle_tess_shader_input_decl(state
, loc
, var
);
8376 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
8377 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
8379 for (unsigned i
= 0; i
< num_variables
; i
++) {
8380 if (var
->data
.mode
== ir_var_shader_storage
)
8381 apply_memory_qualifiers(var
, fields
[i
]);
8384 if (ir_variable
*earlier
=
8385 state
->symbols
->get_variable(this->instance_name
)) {
8386 if (!redeclaring_per_vertex
) {
8387 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
8388 this->instance_name
);
8390 earlier
->data
.how_declared
= ir_var_declared_normally
;
8391 earlier
->type
= var
->type
;
8392 earlier
->reinit_interface_type(block_type
);
8395 if (this->layout
.flags
.q
.explicit_binding
) {
8396 apply_explicit_binding(state
, &loc
, var
, var
->type
,
8400 var
->data
.stream
= qual_stream
;
8401 if (layout
.flags
.q
.explicit_location
) {
8402 var
->data
.location
= expl_location
;
8403 var
->data
.explicit_location
= true;
8406 state
->symbols
->add_variable(var
);
8407 instructions
->push_tail(var
);
8410 /* In order to have an array size, the block must also be declared with
8413 assert(this->array_specifier
== NULL
);
8415 for (unsigned i
= 0; i
< num_variables
; i
++) {
8417 new(state
) ir_variable(fields
[i
].type
,
8418 ralloc_strdup(state
, fields
[i
].name
),
8420 var
->data
.interpolation
= fields
[i
].interpolation
;
8421 var
->data
.centroid
= fields
[i
].centroid
;
8422 var
->data
.sample
= fields
[i
].sample
;
8423 var
->data
.patch
= fields
[i
].patch
;
8424 var
->data
.stream
= qual_stream
;
8425 var
->data
.location
= fields
[i
].location
;
8427 if (fields
[i
].location
!= -1)
8428 var
->data
.explicit_location
= true;
8430 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
8431 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
8433 if (fields
[i
].offset
!= -1)
8434 var
->data
.explicit_xfb_offset
= true;
8435 var
->data
.offset
= fields
[i
].offset
;
8437 var
->init_interface_type(block_type
);
8439 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8440 var
->data
.read_only
= true;
8442 /* Precision qualifiers do not have any meaning in Desktop GLSL */
8443 if (state
->es_shader
) {
8444 var
->data
.precision
=
8445 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
8449 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
8450 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8451 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8453 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
8456 if (var
->data
.mode
== ir_var_shader_storage
)
8457 apply_memory_qualifiers(var
, fields
[i
]);
8459 /* Examine var name here since var may get deleted in the next call */
8460 bool var_is_gl_id
= is_gl_identifier(var
->name
);
8462 if (redeclaring_per_vertex
) {
8463 bool is_redeclaration
;
8465 get_variable_being_redeclared(&var
, loc
, state
,
8466 true /* allow_all_redeclarations */,
8468 if (!var_is_gl_id
|| !is_redeclaration
) {
8469 _mesa_glsl_error(&loc
, state
,
8470 "redeclaration of gl_PerVertex can only "
8471 "include built-in variables");
8472 } else if (var
->data
.how_declared
== ir_var_declared_normally
) {
8473 _mesa_glsl_error(&loc
, state
,
8474 "`%s' has already been redeclared",
8477 var
->data
.how_declared
= ir_var_declared_in_block
;
8478 var
->reinit_interface_type(block_type
);
8483 if (state
->symbols
->get_variable(var
->name
) != NULL
)
8484 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
8486 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
8487 * The UBO declaration itself doesn't get an ir_variable unless it
8488 * has an instance name. This is ugly.
8490 if (this->layout
.flags
.q
.explicit_binding
) {
8491 apply_explicit_binding(state
, &loc
, var
,
8492 var
->get_interface_type(), &this->layout
);
8495 if (var
->type
->is_unsized_array()) {
8496 if (var
->is_in_shader_storage_block() &&
8497 is_unsized_array_last_element(var
)) {
8498 var
->data
.from_ssbo_unsized_array
= true;
8500 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
8502 * "If an array is declared as the last member of a shader storage
8503 * block and the size is not specified at compile-time, it is
8504 * sized at run-time. In all other cases, arrays are sized only
8507 * In desktop GLSL it is allowed to have unsized-arrays that are
8508 * not last, as long as we can determine that they are implicitly
8511 if (state
->es_shader
) {
8512 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
8513 "definition: only last member of a shader "
8514 "storage block can be defined as unsized "
8515 "array", fields
[i
].name
);
8520 state
->symbols
->add_variable(var
);
8521 instructions
->push_tail(var
);
8524 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
8525 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
8527 * It is also a compilation error ... to redeclare a built-in
8528 * block and then use a member from that built-in block that was
8529 * not included in the redeclaration.
8531 * This appears to be a clarification to the behaviour established
8532 * for gl_PerVertex by GLSL 1.50, therefore we implement this
8533 * behaviour regardless of GLSL version.
8535 * To prevent the shader from using a member that was not included in
8536 * the redeclaration, we disable any ir_variables that are still
8537 * associated with the old declaration of gl_PerVertex (since we've
8538 * already updated all of the variables contained in the new
8539 * gl_PerVertex to point to it).
8541 * As a side effect this will prevent
8542 * validate_intrastage_interface_blocks() from getting confused and
8543 * thinking there are conflicting definitions of gl_PerVertex in the
8546 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8547 ir_variable
*const var
= node
->as_variable();
8549 var
->get_interface_type() == earlier_per_vertex
&&
8550 var
->data
.mode
== var_mode
) {
8551 if (var
->data
.how_declared
== ir_var_declared_normally
) {
8552 _mesa_glsl_error(&loc
, state
,
8553 "redeclaration of gl_PerVertex cannot "
8554 "follow a redeclaration of `%s'",
8557 state
->symbols
->disable_variable(var
->name
);
8569 ast_tcs_output_layout::hir(exec_list
*instructions
,
8570 struct _mesa_glsl_parse_state
*state
)
8572 YYLTYPE loc
= this->get_location();
8574 unsigned num_vertices
;
8575 if (!state
->out_qualifier
->vertices
->
8576 process_qualifier_constant(state
, "vertices", &num_vertices
,
8578 /* return here to stop cascading incorrect error messages */
8582 /* If any shader outputs occurred before this declaration and specified an
8583 * array size, make sure the size they specified is consistent with the
8586 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8587 _mesa_glsl_error(&loc
, state
,
8588 "this tessellation control shader output layout "
8589 "specifies %u vertices, but a previous output "
8590 "is declared with size %u",
8591 num_vertices
, state
->tcs_output_size
);
8595 state
->tcs_output_vertices_specified
= true;
8597 /* If any shader outputs occurred before this declaration and did not
8598 * specify an array size, their size is determined now.
8600 foreach_in_list (ir_instruction
, node
, instructions
) {
8601 ir_variable
*var
= node
->as_variable();
8602 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8605 /* Note: Not all tessellation control shader output are arrays. */
8606 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8609 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8610 _mesa_glsl_error(&loc
, state
,
8611 "this tessellation control shader output layout "
8612 "specifies %u vertices, but an access to element "
8613 "%u of output `%s' already exists", num_vertices
,
8614 var
->data
.max_array_access
, var
->name
);
8616 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8626 ast_gs_input_layout::hir(exec_list
*instructions
,
8627 struct _mesa_glsl_parse_state
*state
)
8629 YYLTYPE loc
= this->get_location();
8631 /* Should have been prevented by the parser. */
8632 assert(!state
->gs_input_prim_type_specified
8633 || state
->in_qualifier
->prim_type
== this->prim_type
);
8635 /* If any shader inputs occurred before this declaration and specified an
8636 * array size, make sure the size they specified is consistent with the
8639 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8640 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8641 _mesa_glsl_error(&loc
, state
,
8642 "this geometry shader input layout implies %u vertices"
8643 " per primitive, but a previous input is declared"
8644 " with size %u", num_vertices
, state
->gs_input_size
);
8648 state
->gs_input_prim_type_specified
= true;
8650 /* If any shader inputs occurred before this declaration and did not
8651 * specify an array size, their size is determined now.
8653 foreach_in_list(ir_instruction
, node
, instructions
) {
8654 ir_variable
*var
= node
->as_variable();
8655 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8658 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8662 if (var
->type
->is_unsized_array()) {
8663 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8664 _mesa_glsl_error(&loc
, state
,
8665 "this geometry shader input layout implies %u"
8666 " vertices, but an access to element %u of input"
8667 " `%s' already exists", num_vertices
,
8668 var
->data
.max_array_access
, var
->name
);
8670 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8681 ast_cs_input_layout::hir(exec_list
*instructions
,
8682 struct _mesa_glsl_parse_state
*state
)
8684 YYLTYPE loc
= this->get_location();
8686 /* From the ARB_compute_shader specification:
8688 * If the local size of the shader in any dimension is greater
8689 * than the maximum size supported by the implementation for that
8690 * dimension, a compile-time error results.
8692 * It is not clear from the spec how the error should be reported if
8693 * the total size of the work group exceeds
8694 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8695 * report it at compile time as well.
8697 GLuint64 total_invocations
= 1;
8698 unsigned qual_local_size
[3];
8699 for (int i
= 0; i
< 3; i
++) {
8701 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8703 /* Infer a local_size of 1 for unspecified dimensions */
8704 if (this->local_size
[i
] == NULL
) {
8705 qual_local_size
[i
] = 1;
8706 } else if (!this->local_size
[i
]->
8707 process_qualifier_constant(state
, local_size_str
,
8708 &qual_local_size
[i
], false)) {
8709 ralloc_free(local_size_str
);
8712 ralloc_free(local_size_str
);
8714 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8715 _mesa_glsl_error(&loc
, state
,
8716 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8718 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8721 total_invocations
*= qual_local_size
[i
];
8722 if (total_invocations
>
8723 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8724 _mesa_glsl_error(&loc
, state
,
8725 "product of local_sizes exceeds "
8726 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8727 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8732 /* If any compute input layout declaration preceded this one, make sure it
8733 * was consistent with this one.
8735 if (state
->cs_input_local_size_specified
) {
8736 for (int i
= 0; i
< 3; i
++) {
8737 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8738 _mesa_glsl_error(&loc
, state
,
8739 "compute shader input layout does not match"
8740 " previous declaration");
8746 /* The ARB_compute_variable_group_size spec says:
8748 * If a compute shader including a *local_size_variable* qualifier also
8749 * declares a fixed local group size using the *local_size_x*,
8750 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8753 if (state
->cs_input_local_size_variable_specified
) {
8754 _mesa_glsl_error(&loc
, state
,
8755 "compute shader can't include both a variable and a "
8756 "fixed local group size");
8760 state
->cs_input_local_size_specified
= true;
8761 for (int i
= 0; i
< 3; i
++)
8762 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8764 /* We may now declare the built-in constant gl_WorkGroupSize (see
8765 * builtin_variable_generator::generate_constants() for why we didn't
8766 * declare it earlier).
8768 ir_variable
*var
= new(state
->symbols
)
8769 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8770 var
->data
.how_declared
= ir_var_declared_implicitly
;
8771 var
->data
.read_only
= true;
8772 instructions
->push_tail(var
);
8773 state
->symbols
->add_variable(var
);
8774 ir_constant_data data
;
8775 memset(&data
, 0, sizeof(data
));
8776 for (int i
= 0; i
< 3; i
++)
8777 data
.u
[i
] = qual_local_size
[i
];
8778 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8779 var
->constant_initializer
=
8780 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8781 var
->data
.has_initializer
= true;
8782 var
->data
.is_implicit_initializer
= false;
8789 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8790 exec_list
*instructions
)
8792 bool gl_FragColor_assigned
= false;
8793 bool gl_FragData_assigned
= false;
8794 bool gl_FragSecondaryColor_assigned
= false;
8795 bool gl_FragSecondaryData_assigned
= false;
8796 bool user_defined_fs_output_assigned
= false;
8797 ir_variable
*user_defined_fs_output
= NULL
;
8799 /* It would be nice to have proper location information. */
8801 memset(&loc
, 0, sizeof(loc
));
8803 foreach_in_list(ir_instruction
, node
, instructions
) {
8804 ir_variable
*var
= node
->as_variable();
8806 if (!var
|| !var
->data
.assigned
)
8809 if (strcmp(var
->name
, "gl_FragColor") == 0) {
8810 gl_FragColor_assigned
= true;
8811 if (!var
->constant_initializer
&& state
->zero_init
) {
8812 const ir_constant_data data
= { { 0 } };
8813 var
->data
.has_initializer
= true;
8814 var
->data
.is_implicit_initializer
= true;
8815 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
8818 else if (strcmp(var
->name
, "gl_FragData") == 0)
8819 gl_FragData_assigned
= true;
8820 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8821 gl_FragSecondaryColor_assigned
= true;
8822 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8823 gl_FragSecondaryData_assigned
= true;
8824 else if (!is_gl_identifier(var
->name
)) {
8825 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8826 var
->data
.mode
== ir_var_shader_out
) {
8827 user_defined_fs_output_assigned
= true;
8828 user_defined_fs_output
= var
;
8833 /* From the GLSL 1.30 spec:
8835 * "If a shader statically assigns a value to gl_FragColor, it
8836 * may not assign a value to any element of gl_FragData. If a
8837 * shader statically writes a value to any element of
8838 * gl_FragData, it may not assign a value to
8839 * gl_FragColor. That is, a shader may assign values to either
8840 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8841 * linked together must also consistently write just one of
8842 * these variables. Similarly, if user declared output
8843 * variables are in use (statically assigned to), then the
8844 * built-in variables gl_FragColor and gl_FragData may not be
8845 * assigned to. These incorrect usages all generate compile
8848 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8849 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8850 "`gl_FragColor' and `gl_FragData'");
8851 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8852 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8853 "`gl_FragColor' and `%s'",
8854 user_defined_fs_output
->name
);
8855 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8856 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8857 "`gl_FragSecondaryColorEXT' and"
8858 " `gl_FragSecondaryDataEXT'");
8859 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8860 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8861 "`gl_FragColor' and"
8862 " `gl_FragSecondaryDataEXT'");
8863 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8864 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8866 " `gl_FragSecondaryColorEXT'");
8867 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8868 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8869 "`gl_FragData' and `%s'",
8870 user_defined_fs_output
->name
);
8873 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8874 !state
->EXT_blend_func_extended_enable
) {
8875 _mesa_glsl_error(&loc
, state
,
8876 "Dual source blending requires EXT_blend_func_extended");
8881 verify_subroutine_associated_funcs(struct _mesa_glsl_parse_state
*state
)
8884 memset(&loc
, 0, sizeof(loc
));
8886 /* Section 6.1.2 (Subroutines) of the GLSL 4.00 spec says:
8888 * "A program will fail to compile or link if any shader
8889 * or stage contains two or more functions with the same
8890 * name if the name is associated with a subroutine type."
8893 for (int i
= 0; i
< state
->num_subroutines
; i
++) {
8894 unsigned definitions
= 0;
8895 ir_function
*fn
= state
->subroutines
[i
];
8896 /* Calculate number of function definitions with the same name */
8897 foreach_in_list(ir_function_signature
, sig
, &fn
->signatures
) {
8898 if (sig
->is_defined
) {
8899 if (++definitions
> 1) {
8900 _mesa_glsl_error(&loc
, state
,
8901 "%s shader contains two or more function "
8902 "definitions with name `%s', which is "
8903 "associated with a subroutine type.\n",
8904 _mesa_shader_stage_to_string(state
->stage
),
8914 remove_per_vertex_blocks(exec_list
*instructions
,
8915 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8917 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8918 * if it exists in this shader type.
8920 const glsl_type
*per_vertex
= NULL
;
8922 case ir_var_shader_in
:
8923 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8924 per_vertex
= gl_in
->get_interface_type();
8926 case ir_var_shader_out
:
8927 if (ir_variable
*gl_Position
=
8928 state
->symbols
->get_variable("gl_Position")) {
8929 per_vertex
= gl_Position
->get_interface_type();
8933 assert(!"Unexpected mode");
8937 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8938 * need to do anything.
8940 if (per_vertex
== NULL
)
8943 /* If the interface block is used by the shader, then we don't need to do
8946 interface_block_usage_visitor
v(mode
, per_vertex
);
8947 v
.run(instructions
);
8948 if (v
.usage_found())
8951 /* Remove any ir_variable declarations that refer to the interface block
8954 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8955 ir_variable
*const var
= node
->as_variable();
8956 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8957 var
->data
.mode
== mode
) {
8958 state
->symbols
->disable_variable(var
->name
);
8965 ast_warnings_toggle::hir(exec_list
*,
8966 struct _mesa_glsl_parse_state
*state
)
8968 state
->warnings_enabled
= enable
;