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/macros.h"
58 #include "main/shaderobj.h"
60 #include "ir_builder.h"
61 #include "builtin_functions.h"
63 using namespace ir_builder
;
66 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
67 exec_list
*instructions
);
69 remove_per_vertex_blocks(exec_list
*instructions
,
70 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
73 * Visitor class that finds the first instance of any write-only variable that
74 * is ever read, if any
76 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
79 read_from_write_only_variable_visitor() : found(NULL
)
83 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
85 if (this->in_assignee
)
86 return visit_continue
;
88 ir_variable
*var
= ir
->variable_referenced();
89 /* We can have memory_write_only set on both images and buffer variables,
90 * but in the former there is a distinction between reads from
91 * the variable itself (write_only) and from the memory they point to
92 * (memory_write_only), while in the case of buffer variables there is
93 * no such distinction, that is why this check here is limited to
94 * buffer variables alone.
96 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
97 return visit_continue
;
99 if (var
->data
.memory_write_only
) {
104 return visit_continue
;
107 ir_variable
*get_variable() {
111 virtual ir_visitor_status
visit_enter(ir_expression
*ir
)
113 /* .length() doesn't actually read anything */
114 if (ir
->operation
== ir_unop_ssbo_unsized_array_length
)
115 return visit_continue_with_parent
;
117 return visit_continue
;
125 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
127 _mesa_glsl_initialize_variables(instructions
, state
);
129 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
131 state
->current_function
= NULL
;
133 state
->toplevel_ir
= instructions
;
135 state
->gs_input_prim_type_specified
= false;
136 state
->tcs_output_vertices_specified
= false;
137 state
->cs_input_local_size_specified
= false;
139 /* Section 4.2 of the GLSL 1.20 specification states:
140 * "The built-in functions are scoped in a scope outside the global scope
141 * users declare global variables in. That is, a shader's global scope,
142 * available for user-defined functions and global variables, is nested
143 * inside the scope containing the built-in functions."
145 * Since built-in functions like ftransform() access built-in variables,
146 * it follows that those must be in the outer scope as well.
148 * We push scope here to create this nesting effect...but don't pop.
149 * This way, a shader's globals are still in the symbol table for use
152 state
->symbols
->push_scope();
154 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
155 ast
->hir(instructions
, state
);
157 detect_recursion_unlinked(state
, instructions
);
158 detect_conflicting_assignments(state
, instructions
);
160 state
->toplevel_ir
= NULL
;
162 /* Move all of the variable declarations to the front of the IR list, and
163 * reverse the order. This has the (intended!) side effect that vertex
164 * shader inputs and fragment shader outputs will appear in the IR in the
165 * same order that they appeared in the shader code. This results in the
166 * locations being assigned in the declared order. Many (arguably buggy)
167 * applications depend on this behavior, and it matches what nearly all
170 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
171 ir_variable
*const var
= node
->as_variable();
177 instructions
->push_head(var
);
180 /* Figure out if gl_FragCoord is actually used in fragment shader */
181 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
183 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
185 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
187 * If multiple shaders using members of a built-in block belonging to
188 * the same interface are linked together in the same program, they
189 * must all redeclare the built-in block in the same way, as described
190 * in section 4.3.7 "Interface Blocks" for interface block matching, or
191 * a link error will result.
193 * The phrase "using members of a built-in block" implies that if two
194 * shaders are linked together and one of them *does not use* any members
195 * of the built-in block, then that shader does not need to have a matching
196 * redeclaration of the built-in block.
198 * This appears to be a clarification to the behaviour established for
199 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
202 * The definition of "interface" in section 4.3.7 that applies here is as
205 * The boundary between adjacent programmable pipeline stages: This
206 * spans all the outputs in all compilation units of the first stage
207 * and all the inputs in all compilation units of the second stage.
209 * Therefore this rule applies to both inter- and intra-stage linking.
211 * The easiest way to implement this is to check whether the shader uses
212 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
213 * remove all the relevant variable declaration from the IR, so that the
214 * linker won't see them and complain about mismatches.
216 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
217 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
219 /* Check that we don't have reads from write-only variables */
220 read_from_write_only_variable_visitor v
;
222 ir_variable
*error_var
= v
.get_variable();
224 /* It would be nice to have proper location information, but for that
225 * we would need to check this as we process each kind of AST node
228 memset(&loc
, 0, sizeof(loc
));
229 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
235 static ir_expression_operation
236 get_implicit_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
237 struct _mesa_glsl_parse_state
*state
)
239 switch (to
->base_type
) {
240 case GLSL_TYPE_FLOAT
:
241 switch (from
->base_type
) {
242 case GLSL_TYPE_INT
: return ir_unop_i2f
;
243 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
244 default: return (ir_expression_operation
)0;
248 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
249 && !state
->MESA_shader_integer_functions_enable
)
250 return (ir_expression_operation
)0;
251 switch (from
->base_type
) {
252 case GLSL_TYPE_INT
: return ir_unop_i2u
;
253 default: return (ir_expression_operation
)0;
256 case GLSL_TYPE_DOUBLE
:
257 if (!state
->has_double())
258 return (ir_expression_operation
)0;
259 switch (from
->base_type
) {
260 case GLSL_TYPE_INT
: return ir_unop_i2d
;
261 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
262 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
263 case GLSL_TYPE_INT64
: return ir_unop_i642d
;
264 case GLSL_TYPE_UINT64
: return ir_unop_u642d
;
265 default: return (ir_expression_operation
)0;
268 case GLSL_TYPE_UINT64
:
269 if (!state
->has_int64())
270 return (ir_expression_operation
)0;
271 switch (from
->base_type
) {
272 case GLSL_TYPE_INT
: return ir_unop_i2u64
;
273 case GLSL_TYPE_UINT
: return ir_unop_u2u64
;
274 case GLSL_TYPE_INT64
: return ir_unop_i642u64
;
275 default: return (ir_expression_operation
)0;
278 case GLSL_TYPE_INT64
:
279 if (!state
->has_int64())
280 return (ir_expression_operation
)0;
281 switch (from
->base_type
) {
282 case GLSL_TYPE_INT
: return ir_unop_i2i64
;
283 default: return (ir_expression_operation
)0;
286 default: return (ir_expression_operation
)0;
292 * If a conversion is available, convert one operand to a different type
294 * The \c from \c ir_rvalue is converted "in place".
296 * \param to Type that the operand it to be converted to
297 * \param from Operand that is being converted
298 * \param state GLSL compiler state
301 * If a conversion is possible (or unnecessary), \c true is returned.
302 * Otherwise \c false is returned.
305 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
306 struct _mesa_glsl_parse_state
*state
)
309 if (to
->base_type
== from
->type
->base_type
)
312 /* Prior to GLSL 1.20, there are no implicit conversions */
313 if (!state
->is_version(120, 0))
316 /* ESSL does not allow implicit conversions */
317 if (state
->es_shader
)
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
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
613 return glsl_type::error_type
;
616 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
618 * "The operator modulus (%) operates on signed or unsigned integers or
621 if (!type_a
->is_integer_32_64()) {
622 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
623 return glsl_type::error_type
;
625 if (!type_b
->is_integer_32_64()) {
626 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
627 return glsl_type::error_type
;
630 /* "If the fundamental types in the operands do not match, then the
631 * conversions from section 4.1.10 "Implicit Conversions" are applied
632 * to create matching types."
634 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
635 * int -> uint conversion rules. Prior to that, there were no implicit
636 * conversions. So it's harmless to apply them universally - no implicit
637 * conversions will exist. If the types don't match, we'll receive false,
638 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
640 * "The operand types must both be signed or unsigned."
642 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
643 !apply_implicit_conversion(type_b
, value_a
, state
)) {
644 _mesa_glsl_error(loc
, state
,
645 "could not implicitly convert operands to "
646 "modulus (%%) operator");
647 return glsl_type::error_type
;
649 type_a
= value_a
->type
;
650 type_b
= value_b
->type
;
652 /* "The operands cannot be vectors of differing size. If one operand is
653 * a scalar and the other vector, then the scalar is applied component-
654 * wise to the vector, resulting in the same type as the vector. If both
655 * are vectors of the same size, the result is computed component-wise."
657 if (type_a
->is_vector()) {
658 if (!type_b
->is_vector()
659 || (type_a
->vector_elements
== type_b
->vector_elements
))
664 /* "The operator modulus (%) is not defined for any other data types
665 * (non-integer types)."
667 _mesa_glsl_error(loc
, state
, "type mismatch");
668 return glsl_type::error_type
;
672 static const struct glsl_type
*
673 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
674 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
676 const glsl_type
*type_a
= value_a
->type
;
677 const glsl_type
*type_b
= value_b
->type
;
679 /* From GLSL 1.50 spec, page 56:
680 * "The relational operators greater than (>), less than (<), greater
681 * than or equal (>=), and less than or equal (<=) operate only on
682 * scalar integer and scalar floating-point expressions."
684 if (!type_a
->is_numeric()
685 || !type_b
->is_numeric()
686 || !type_a
->is_scalar()
687 || !type_b
->is_scalar()) {
688 _mesa_glsl_error(loc
, state
,
689 "operands to relational operators must be scalar and "
691 return glsl_type::error_type
;
694 /* "Either the operands' types must match, or the conversions from
695 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
696 * operand, after which the types must match."
698 if (!apply_implicit_conversion(type_a
, value_b
, state
)
699 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
700 _mesa_glsl_error(loc
, state
,
701 "could not implicitly convert operands to "
702 "relational operator");
703 return glsl_type::error_type
;
705 type_a
= value_a
->type
;
706 type_b
= value_b
->type
;
708 if (type_a
->base_type
!= type_b
->base_type
) {
709 _mesa_glsl_error(loc
, state
, "base type mismatch");
710 return glsl_type::error_type
;
713 /* "The result is scalar Boolean."
715 return glsl_type::bool_type
;
719 * \brief Return the result type of a bit-shift operation.
721 * If the given types to the bit-shift operator are invalid, return
722 * glsl_type::error_type.
724 * \param type_a Type of LHS of bit-shift op
725 * \param type_b Type of RHS of bit-shift op
727 static const struct glsl_type
*
728 shift_result_type(const struct glsl_type
*type_a
,
729 const struct glsl_type
*type_b
,
731 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
733 if (!state
->check_bitwise_operations_allowed(loc
)) {
734 return glsl_type::error_type
;
737 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
739 * "The shift operators (<<) and (>>). For both operators, the operands
740 * must be signed or unsigned integers or integer vectors. One operand
741 * can be signed while the other is unsigned."
743 if (!type_a
->is_integer_32_64()) {
744 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
745 "integer vector", ast_expression::operator_string(op
));
746 return glsl_type::error_type
;
749 if (!type_b
->is_integer()) {
750 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
751 "integer vector", ast_expression::operator_string(op
));
752 return glsl_type::error_type
;
755 /* "If the first operand is a scalar, the second operand has to be
758 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
759 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
760 "second must be scalar as well",
761 ast_expression::operator_string(op
));
762 return glsl_type::error_type
;
765 /* If both operands are vectors, check that they have same number of
768 if (type_a
->is_vector() &&
769 type_b
->is_vector() &&
770 type_a
->vector_elements
!= type_b
->vector_elements
) {
771 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
772 "have same number of elements",
773 ast_expression::operator_string(op
));
774 return glsl_type::error_type
;
777 /* "In all cases, the resulting type will be the same type as the left
784 * Returns the innermost array index expression in an rvalue tree.
785 * This is the largest indexing level -- if an array of blocks, then
786 * it is the block index rather than an indexing expression for an
787 * array-typed member of an array of blocks.
790 find_innermost_array_index(ir_rvalue
*rv
)
792 ir_dereference_array
*last
= NULL
;
794 if (rv
->as_dereference_array()) {
795 last
= rv
->as_dereference_array();
797 } else if (rv
->as_dereference_record())
798 rv
= rv
->as_dereference_record()->record
;
799 else if (rv
->as_swizzle())
800 rv
= rv
->as_swizzle()->val
;
806 return last
->array_index
;
812 * Validates that a value can be assigned to a location with a specified type
814 * Validates that \c rhs can be assigned to some location. If the types are
815 * not an exact match but an automatic conversion is possible, \c rhs will be
819 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
820 * Otherwise the actual RHS to be assigned will be returned. This may be
821 * \c rhs, or it may be \c rhs after some type conversion.
824 * In addition to being used for assignments, this function is used to
825 * type-check return values.
828 validate_assignment(struct _mesa_glsl_parse_state
*state
,
829 YYLTYPE loc
, ir_rvalue
*lhs
,
830 ir_rvalue
*rhs
, bool is_initializer
)
832 /* If there is already some error in the RHS, just return it. Anything
833 * else will lead to an avalanche of error message back to the user.
835 if (rhs
->type
->is_error())
838 /* In the Tessellation Control Shader:
839 * If a per-vertex output variable is used as an l-value, it is an error
840 * if the expression indicating the vertex number is not the identifier
843 if (state
->stage
== MESA_SHADER_TESS_CTRL
&& !lhs
->type
->is_error()) {
844 ir_variable
*var
= lhs
->variable_referenced();
845 if (var
&& var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
846 ir_rvalue
*index
= find_innermost_array_index(lhs
);
847 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
848 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
849 _mesa_glsl_error(&loc
, state
,
850 "Tessellation control shader outputs can only "
851 "be indexed by gl_InvocationID");
857 /* If the types are identical, the assignment can trivially proceed.
859 if (rhs
->type
== lhs
->type
)
862 /* If the array element types are the same and the LHS is unsized,
863 * the assignment is okay for initializers embedded in variable
866 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
867 * is handled by ir_dereference::is_lvalue.
869 const glsl_type
*lhs_t
= lhs
->type
;
870 const glsl_type
*rhs_t
= rhs
->type
;
871 bool unsized_array
= false;
872 while(lhs_t
->is_array()) {
874 break; /* the rest of the inner arrays match so break out early */
875 if (!rhs_t
->is_array()) {
876 unsized_array
= false;
877 break; /* number of dimensions mismatch */
879 if (lhs_t
->length
== rhs_t
->length
) {
880 lhs_t
= lhs_t
->fields
.array
;
881 rhs_t
= rhs_t
->fields
.array
;
883 } else if (lhs_t
->is_unsized_array()) {
884 unsized_array
= true;
886 unsized_array
= false;
887 break; /* sized array mismatch */
889 lhs_t
= lhs_t
->fields
.array
;
890 rhs_t
= rhs_t
->fields
.array
;
893 if (is_initializer
) {
896 _mesa_glsl_error(&loc
, state
,
897 "implicitly sized arrays cannot be assigned");
902 /* Check for implicit conversion in GLSL 1.20 */
903 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
904 if (rhs
->type
== lhs
->type
)
908 _mesa_glsl_error(&loc
, state
,
909 "%s of type %s cannot be assigned to "
910 "variable of type %s",
911 is_initializer
? "initializer" : "value",
912 rhs
->type
->name
, lhs
->type
->name
);
918 mark_whole_array_access(ir_rvalue
*access
)
920 ir_dereference_variable
*deref
= access
->as_dereference_variable();
922 if (deref
&& deref
->var
) {
923 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
928 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
929 const char *non_lvalue_description
,
930 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
931 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
936 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
938 ir_variable
*lhs_var
= lhs
->variable_referenced();
940 lhs_var
->data
.assigned
= true;
942 if (!error_emitted
) {
943 if (non_lvalue_description
!= NULL
) {
944 _mesa_glsl_error(&lhs_loc
, state
,
946 non_lvalue_description
);
947 error_emitted
= true;
948 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
949 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
950 lhs_var
->data
.memory_read_only
))) {
951 /* We can have memory_read_only set on both images and buffer variables,
952 * but in the former there is a distinction between assignments to
953 * the variable itself (read_only) and to the memory they point to
954 * (memory_read_only), while in the case of buffer variables there is
955 * no such distinction, that is why this check here is limited to
956 * buffer variables alone.
958 _mesa_glsl_error(&lhs_loc
, state
,
959 "assignment to read-only variable '%s'",
961 error_emitted
= true;
962 } else if (lhs
->type
->is_array() &&
963 !state
->check_version(120, 300, &lhs_loc
,
964 "whole array assignment forbidden")) {
965 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
967 * "Other binary or unary expressions, non-dereferenced
968 * arrays, function names, swizzles with repeated fields,
969 * and constants cannot be l-values."
971 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
973 error_emitted
= true;
974 } else if (!lhs
->is_lvalue(state
)) {
975 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
976 error_emitted
= true;
981 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
982 if (new_rhs
!= NULL
) {
985 /* If the LHS array was not declared with a size, it takes it size from
986 * the RHS. If the LHS is an l-value and a whole array, it must be a
987 * dereference of a variable. Any other case would require that the LHS
988 * is either not an l-value or not a whole array.
990 if (lhs
->type
->is_unsized_array()) {
991 ir_dereference
*const d
= lhs
->as_dereference();
995 ir_variable
*const var
= d
->variable_referenced();
999 if (var
->data
.max_array_access
>= rhs
->type
->array_size()) {
1000 /* FINISHME: This should actually log the location of the RHS. */
1001 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
1003 var
->data
.max_array_access
);
1006 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
1007 rhs
->type
->array_size());
1008 d
->type
= var
->type
;
1010 if (lhs
->type
->is_array()) {
1011 mark_whole_array_access(rhs
);
1012 mark_whole_array_access(lhs
);
1016 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
1017 * but not post_inc) need the converted assigned value as an rvalue
1018 * to handle things like:
1024 if (!error_emitted
) {
1025 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1027 instructions
->push_tail(var
);
1028 instructions
->push_tail(assign(var
, rhs
));
1030 ir_dereference_variable
*deref_var
=
1031 new(ctx
) ir_dereference_variable(var
);
1032 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1033 rvalue
= new(ctx
) ir_dereference_variable(var
);
1035 rvalue
= ir_rvalue::error_value(ctx
);
1037 *out_rvalue
= rvalue
;
1040 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1044 return error_emitted
;
1048 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1050 void *ctx
= ralloc_parent(lvalue
);
1053 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1055 instructions
->push_tail(var
);
1057 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1060 return new(ctx
) ir_dereference_variable(var
);
1065 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1067 (void) instructions
;
1074 ast_node::has_sequence_subexpression() const
1080 ast_node::set_is_lhs(bool /* new_value */)
1085 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1086 struct _mesa_glsl_parse_state
*state
)
1088 (void)hir(instructions
, state
);
1092 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1093 struct _mesa_glsl_parse_state
*state
)
1095 (void)hir(instructions
, state
);
1099 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1102 ir_rvalue
*cmp
= NULL
;
1104 if (operation
== ir_binop_all_equal
)
1105 join_op
= ir_binop_logic_and
;
1107 join_op
= ir_binop_logic_or
;
1109 switch (op0
->type
->base_type
) {
1110 case GLSL_TYPE_FLOAT
:
1111 case GLSL_TYPE_UINT
:
1113 case GLSL_TYPE_BOOL
:
1114 case GLSL_TYPE_DOUBLE
:
1115 case GLSL_TYPE_UINT64
:
1116 case GLSL_TYPE_INT64
:
1117 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1119 case GLSL_TYPE_ARRAY
: {
1120 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1121 ir_rvalue
*e0
, *e1
, *result
;
1123 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1124 new(mem_ctx
) ir_constant(i
));
1125 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1126 new(mem_ctx
) ir_constant(i
));
1127 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1130 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1136 mark_whole_array_access(op0
);
1137 mark_whole_array_access(op1
);
1141 case GLSL_TYPE_STRUCT
: {
1142 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1143 ir_rvalue
*e0
, *e1
, *result
;
1144 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1146 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1148 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1150 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1153 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1161 case GLSL_TYPE_ERROR
:
1162 case GLSL_TYPE_VOID
:
1163 case GLSL_TYPE_SAMPLER
:
1164 case GLSL_TYPE_IMAGE
:
1165 case GLSL_TYPE_INTERFACE
:
1166 case GLSL_TYPE_ATOMIC_UINT
:
1167 case GLSL_TYPE_SUBROUTINE
:
1168 case GLSL_TYPE_FUNCTION
:
1169 /* I assume a comparison of a struct containing a sampler just
1170 * ignores the sampler present in the type.
1176 cmp
= new(mem_ctx
) ir_constant(true);
1181 /* For logical operations, we want to ensure that the operands are
1182 * scalar booleans. If it isn't, emit an error and return a constant
1183 * boolean to avoid triggering cascading error messages.
1186 get_scalar_boolean_operand(exec_list
*instructions
,
1187 struct _mesa_glsl_parse_state
*state
,
1188 ast_expression
*parent_expr
,
1190 const char *operand_name
,
1191 bool *error_emitted
)
1193 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1195 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1197 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1200 if (!*error_emitted
) {
1201 YYLTYPE loc
= expr
->get_location();
1202 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1204 parent_expr
->operator_string(parent_expr
->oper
));
1205 *error_emitted
= true;
1208 return new(ctx
) ir_constant(true);
1212 * If name refers to a builtin array whose maximum allowed size is less than
1213 * size, report an error and return true. Otherwise return false.
1216 check_builtin_array_max_size(const char *name
, unsigned size
,
1217 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1219 if ((strcmp("gl_TexCoord", name
) == 0)
1220 && (size
> state
->Const
.MaxTextureCoords
)) {
1221 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1223 * "The size [of gl_TexCoord] can be at most
1224 * gl_MaxTextureCoords."
1226 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1227 "be larger than gl_MaxTextureCoords (%u)",
1228 state
->Const
.MaxTextureCoords
);
1229 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1230 state
->clip_dist_size
= size
;
1231 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1232 /* From section 7.1 (Vertex Shader Special Variables) of the
1235 * "The gl_ClipDistance array is predeclared as unsized and
1236 * must be sized by the shader either redeclaring it with a
1237 * size or indexing it only with integral constant
1238 * expressions. ... The size can be at most
1239 * gl_MaxClipDistances."
1241 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1242 "be larger than gl_MaxClipDistances (%u)",
1243 state
->Const
.MaxClipPlanes
);
1245 } else if (strcmp("gl_CullDistance", name
) == 0) {
1246 state
->cull_dist_size
= size
;
1247 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1248 /* From the ARB_cull_distance spec:
1250 * "The gl_CullDistance array is predeclared as unsized and
1251 * must be sized by the shader either redeclaring it with
1252 * a size or indexing it only with integral constant
1253 * expressions. The size determines the number and set of
1254 * enabled cull distances and can be at most
1255 * gl_MaxCullDistances."
1257 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1258 "be larger than gl_MaxCullDistances (%u)",
1259 state
->Const
.MaxClipPlanes
);
1265 * Create the constant 1, of a which is appropriate for incrementing and
1266 * decrementing values of the given GLSL type. For example, if type is vec4,
1267 * this creates a constant value of 1.0 having type float.
1269 * If the given type is invalid for increment and decrement operators, return
1270 * a floating point 1--the error will be detected later.
1273 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1275 switch (type
->base_type
) {
1276 case GLSL_TYPE_UINT
:
1277 return new(ctx
) ir_constant((unsigned) 1);
1279 return new(ctx
) ir_constant(1);
1280 case GLSL_TYPE_UINT64
:
1281 return new(ctx
) ir_constant((uint64_t) 1);
1282 case GLSL_TYPE_INT64
:
1283 return new(ctx
) ir_constant((int64_t) 1);
1285 case GLSL_TYPE_FLOAT
:
1286 return new(ctx
) ir_constant(1.0f
);
1291 ast_expression::hir(exec_list
*instructions
,
1292 struct _mesa_glsl_parse_state
*state
)
1294 return do_hir(instructions
, state
, true);
1298 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1299 struct _mesa_glsl_parse_state
*state
)
1301 do_hir(instructions
, state
, false);
1305 ast_expression::set_is_lhs(bool new_value
)
1307 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1308 * if we lack an identifier we can just skip it.
1310 if (this->primary_expression
.identifier
== NULL
)
1313 this->is_lhs
= new_value
;
1315 /* We need to go through the subexpressions tree to cover cases like
1316 * ast_field_selection
1318 if (this->subexpressions
[0] != NULL
)
1319 this->subexpressions
[0]->set_is_lhs(new_value
);
1323 ast_expression::do_hir(exec_list
*instructions
,
1324 struct _mesa_glsl_parse_state
*state
,
1328 static const int operations
[AST_NUM_OPERATORS
] = {
1329 -1, /* ast_assign doesn't convert to ir_expression. */
1330 -1, /* ast_plus doesn't convert to ir_expression. */
1344 ir_binop_any_nequal
,
1354 /* Note: The following block of expression types actually convert
1355 * to multiple IR instructions.
1357 ir_binop_mul
, /* ast_mul_assign */
1358 ir_binop_div
, /* ast_div_assign */
1359 ir_binop_mod
, /* ast_mod_assign */
1360 ir_binop_add
, /* ast_add_assign */
1361 ir_binop_sub
, /* ast_sub_assign */
1362 ir_binop_lshift
, /* ast_ls_assign */
1363 ir_binop_rshift
, /* ast_rs_assign */
1364 ir_binop_bit_and
, /* ast_and_assign */
1365 ir_binop_bit_xor
, /* ast_xor_assign */
1366 ir_binop_bit_or
, /* ast_or_assign */
1368 -1, /* ast_conditional doesn't convert to ir_expression. */
1369 ir_binop_add
, /* ast_pre_inc. */
1370 ir_binop_sub
, /* ast_pre_dec. */
1371 ir_binop_add
, /* ast_post_inc. */
1372 ir_binop_sub
, /* ast_post_dec. */
1373 -1, /* ast_field_selection doesn't conv to ir_expression. */
1374 -1, /* ast_array_index doesn't convert to ir_expression. */
1375 -1, /* ast_function_call doesn't conv to ir_expression. */
1376 -1, /* ast_identifier doesn't convert to ir_expression. */
1377 -1, /* ast_int_constant doesn't convert to ir_expression. */
1378 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1379 -1, /* ast_float_constant doesn't conv to ir_expression. */
1380 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1381 -1, /* ast_sequence doesn't convert to ir_expression. */
1382 -1, /* ast_aggregate shouldn't ever even get here. */
1384 ir_rvalue
*result
= NULL
;
1386 const struct glsl_type
*type
, *orig_type
;
1387 bool error_emitted
= false;
1390 loc
= this->get_location();
1392 switch (this->oper
) {
1394 assert(!"ast_aggregate: Should never get here.");
1398 this->subexpressions
[0]->set_is_lhs(true);
1399 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1400 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1403 do_assignment(instructions
, state
,
1404 this->subexpressions
[0]->non_lvalue_description
,
1405 op
[0], op
[1], &result
, needs_rvalue
, false,
1406 this->subexpressions
[0]->get_location());
1411 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1413 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1415 error_emitted
= type
->is_error();
1421 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1423 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1425 error_emitted
= type
->is_error();
1427 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1435 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1436 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1438 type
= arithmetic_result_type(op
[0], op
[1],
1439 (this->oper
== ast_mul
),
1441 error_emitted
= type
->is_error();
1443 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1448 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1449 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1451 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1453 assert(operations
[this->oper
] == ir_binop_mod
);
1455 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1457 error_emitted
= type
->is_error();
1462 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1463 error_emitted
= true;
1466 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1467 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1468 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1470 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1472 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1479 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1480 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1482 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1484 /* The relational operators must either generate an error or result
1485 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1487 assert(type
->is_error()
1488 || (type
->is_boolean() && type
->is_scalar()));
1490 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1492 error_emitted
= type
->is_error();
1497 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1498 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1500 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1502 * "The equality operators equal (==), and not equal (!=)
1503 * operate on all types. They result in a scalar Boolean. If
1504 * the operand types do not match, then there must be a
1505 * conversion from Section 4.1.10 "Implicit Conversions"
1506 * applied to one operand that can make them match, in which
1507 * case this conversion is done."
1510 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1511 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1512 "no operation `%1$s' exists that takes a left-hand "
1513 "operand of type 'void' or a right operand of type "
1514 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1515 error_emitted
= true;
1516 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1517 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1518 || (op
[0]->type
!= op
[1]->type
)) {
1519 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1520 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1521 error_emitted
= true;
1522 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1523 !state
->check_version(120, 300, &loc
,
1524 "array comparisons forbidden")) {
1525 error_emitted
= true;
1526 } else if ((op
[0]->type
->contains_subroutine() ||
1527 op
[1]->type
->contains_subroutine())) {
1528 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1529 error_emitted
= true;
1530 } else if ((op
[0]->type
->contains_opaque() ||
1531 op
[1]->type
->contains_opaque())) {
1532 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1533 error_emitted
= true;
1536 if (error_emitted
) {
1537 result
= new(ctx
) ir_constant(false);
1539 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1540 assert(result
->type
== glsl_type::bool_type
);
1547 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1548 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1549 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1550 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1552 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1556 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1558 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1559 error_emitted
= true;
1562 if (!op
[0]->type
->is_integer_32_64()) {
1563 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1564 error_emitted
= true;
1567 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1568 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1571 case ast_logic_and
: {
1572 exec_list rhs_instructions
;
1573 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1574 "LHS", &error_emitted
);
1575 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1576 "RHS", &error_emitted
);
1578 if (rhs_instructions
.is_empty()) {
1579 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1580 type
= result
->type
;
1582 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1585 instructions
->push_tail(tmp
);
1587 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1588 instructions
->push_tail(stmt
);
1590 stmt
->then_instructions
.append_list(&rhs_instructions
);
1591 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1592 ir_assignment
*const then_assign
=
1593 new(ctx
) ir_assignment(then_deref
, op
[1]);
1594 stmt
->then_instructions
.push_tail(then_assign
);
1596 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1597 ir_assignment
*const else_assign
=
1598 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1599 stmt
->else_instructions
.push_tail(else_assign
);
1601 result
= new(ctx
) ir_dereference_variable(tmp
);
1607 case ast_logic_or
: {
1608 exec_list rhs_instructions
;
1609 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1610 "LHS", &error_emitted
);
1611 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1612 "RHS", &error_emitted
);
1614 if (rhs_instructions
.is_empty()) {
1615 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1616 type
= result
->type
;
1618 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1621 instructions
->push_tail(tmp
);
1623 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1624 instructions
->push_tail(stmt
);
1626 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1627 ir_assignment
*const then_assign
=
1628 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1629 stmt
->then_instructions
.push_tail(then_assign
);
1631 stmt
->else_instructions
.append_list(&rhs_instructions
);
1632 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1633 ir_assignment
*const else_assign
=
1634 new(ctx
) ir_assignment(else_deref
, op
[1]);
1635 stmt
->else_instructions
.push_tail(else_assign
);
1637 result
= new(ctx
) ir_dereference_variable(tmp
);
1644 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1646 * "The logical binary operators and (&&), or ( | | ), and
1647 * exclusive or (^^). They operate only on two Boolean
1648 * expressions and result in a Boolean expression."
1650 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1652 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1655 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1660 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1661 "operand", &error_emitted
);
1663 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1667 case ast_mul_assign
:
1668 case ast_div_assign
:
1669 case ast_add_assign
:
1670 case ast_sub_assign
: {
1671 this->subexpressions
[0]->set_is_lhs(true);
1672 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1673 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1675 orig_type
= op
[0]->type
;
1676 type
= arithmetic_result_type(op
[0], op
[1],
1677 (this->oper
== ast_mul_assign
),
1680 if (type
!= orig_type
) {
1681 _mesa_glsl_error(& loc
, state
,
1682 "could not implicitly convert "
1683 "%s to %s", type
->name
, orig_type
->name
);
1684 type
= glsl_type::error_type
;
1687 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1691 do_assignment(instructions
, state
,
1692 this->subexpressions
[0]->non_lvalue_description
,
1693 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1694 &result
, needs_rvalue
, false,
1695 this->subexpressions
[0]->get_location());
1697 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1698 * explicitly test for this because none of the binary expression
1699 * operators allow array operands either.
1705 case ast_mod_assign
: {
1706 this->subexpressions
[0]->set_is_lhs(true);
1707 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1708 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1710 orig_type
= op
[0]->type
;
1711 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1713 if (type
!= orig_type
) {
1714 _mesa_glsl_error(& loc
, state
,
1715 "could not implicitly convert "
1716 "%s to %s", type
->name
, orig_type
->name
);
1717 type
= glsl_type::error_type
;
1720 assert(operations
[this->oper
] == ir_binop_mod
);
1722 ir_rvalue
*temp_rhs
;
1723 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1727 do_assignment(instructions
, state
,
1728 this->subexpressions
[0]->non_lvalue_description
,
1729 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1730 &result
, needs_rvalue
, false,
1731 this->subexpressions
[0]->get_location());
1736 case ast_rs_assign
: {
1737 this->subexpressions
[0]->set_is_lhs(true);
1738 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1739 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1740 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1742 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1743 type
, op
[0], op
[1]);
1745 do_assignment(instructions
, state
,
1746 this->subexpressions
[0]->non_lvalue_description
,
1747 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1748 &result
, needs_rvalue
, false,
1749 this->subexpressions
[0]->get_location());
1753 case ast_and_assign
:
1754 case ast_xor_assign
:
1755 case ast_or_assign
: {
1756 this->subexpressions
[0]->set_is_lhs(true);
1757 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1758 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1760 orig_type
= op
[0]->type
;
1761 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1763 if (type
!= orig_type
) {
1764 _mesa_glsl_error(& loc
, state
,
1765 "could not implicitly convert "
1766 "%s to %s", type
->name
, orig_type
->name
);
1767 type
= glsl_type::error_type
;
1770 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1771 type
, op
[0], op
[1]);
1773 do_assignment(instructions
, state
,
1774 this->subexpressions
[0]->non_lvalue_description
,
1775 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1776 &result
, needs_rvalue
, false,
1777 this->subexpressions
[0]->get_location());
1781 case ast_conditional
: {
1782 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1784 * "The ternary selection operator (?:). It operates on three
1785 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1786 * first expression, which must result in a scalar Boolean."
1788 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1789 "condition", &error_emitted
);
1791 /* The :? operator is implemented by generating an anonymous temporary
1792 * followed by an if-statement. The last instruction in each branch of
1793 * the if-statement assigns a value to the anonymous temporary. This
1794 * temporary is the r-value of the expression.
1796 exec_list then_instructions
;
1797 exec_list else_instructions
;
1799 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1800 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1802 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1804 * "The second and third expressions can be any type, as
1805 * long their types match, or there is a conversion in
1806 * Section 4.1.10 "Implicit Conversions" that can be applied
1807 * to one of the expressions to make their types match. This
1808 * resulting matching type is the type of the entire
1811 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1812 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1813 || (op
[1]->type
!= op
[2]->type
)) {
1814 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1816 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1817 "operator must have matching types");
1818 error_emitted
= true;
1819 type
= glsl_type::error_type
;
1824 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1826 * "The second and third expressions must be the same type, but can
1827 * be of any type other than an array."
1829 if (type
->is_array() &&
1830 !state
->check_version(120, 300, &loc
,
1831 "second and third operands of ?: operator "
1832 "cannot be arrays")) {
1833 error_emitted
= true;
1836 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1838 * "Except for array indexing, structure member selection, and
1839 * parentheses, opaque variables are not allowed to be operands in
1840 * expressions; such use results in a compile-time error."
1842 if (type
->contains_opaque()) {
1843 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1844 "of the ?: operator");
1845 error_emitted
= true;
1848 ir_constant
*cond_val
= op
[0]->constant_expression_value(ctx
);
1850 if (then_instructions
.is_empty()
1851 && else_instructions
.is_empty()
1852 && cond_val
!= NULL
) {
1853 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1855 /* The copy to conditional_tmp reads the whole array. */
1856 if (type
->is_array()) {
1857 mark_whole_array_access(op
[1]);
1858 mark_whole_array_access(op
[2]);
1861 ir_variable
*const tmp
=
1862 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1863 instructions
->push_tail(tmp
);
1865 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1866 instructions
->push_tail(stmt
);
1868 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1869 ir_dereference
*const then_deref
=
1870 new(ctx
) ir_dereference_variable(tmp
);
1871 ir_assignment
*const then_assign
=
1872 new(ctx
) ir_assignment(then_deref
, op
[1]);
1873 stmt
->then_instructions
.push_tail(then_assign
);
1875 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1876 ir_dereference
*const else_deref
=
1877 new(ctx
) ir_dereference_variable(tmp
);
1878 ir_assignment
*const else_assign
=
1879 new(ctx
) ir_assignment(else_deref
, op
[2]);
1880 stmt
->else_instructions
.push_tail(else_assign
);
1882 result
= new(ctx
) ir_dereference_variable(tmp
);
1889 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1890 ? "pre-increment operation" : "pre-decrement operation";
1892 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1893 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1895 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1897 ir_rvalue
*temp_rhs
;
1898 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1902 do_assignment(instructions
, state
,
1903 this->subexpressions
[0]->non_lvalue_description
,
1904 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1905 &result
, needs_rvalue
, false,
1906 this->subexpressions
[0]->get_location());
1911 case ast_post_dec
: {
1912 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1913 ? "post-increment operation" : "post-decrement operation";
1914 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1915 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1917 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1919 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1921 ir_rvalue
*temp_rhs
;
1922 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1925 /* Get a temporary of a copy of the lvalue before it's modified.
1926 * This may get thrown away later.
1928 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1930 ir_rvalue
*junk_rvalue
;
1932 do_assignment(instructions
, state
,
1933 this->subexpressions
[0]->non_lvalue_description
,
1934 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1935 &junk_rvalue
, false, false,
1936 this->subexpressions
[0]->get_location());
1941 case ast_field_selection
:
1942 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1945 case ast_array_index
: {
1946 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1948 /* Getting if an array is being used uninitialized is beyond what we get
1949 * from ir_value.data.assigned. Setting is_lhs as true would force to
1950 * not raise a uninitialized warning when using an array
1952 subexpressions
[0]->set_is_lhs(true);
1953 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1954 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1956 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1959 if (result
->type
->is_error())
1960 error_emitted
= true;
1965 case ast_unsized_array_dim
:
1966 assert(!"ast_unsized_array_dim: Should never get here.");
1969 case ast_function_call
:
1970 /* Should *NEVER* get here. ast_function_call should always be handled
1971 * by ast_function_expression::hir.
1976 case ast_identifier
: {
1977 /* ast_identifier can appear several places in a full abstract syntax
1978 * tree. This particular use must be at location specified in the grammar
1979 * as 'variable_identifier'.
1982 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1985 /* the identifier might be a subroutine name */
1987 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
1988 var
= state
->symbols
->get_variable(sub_name
);
1989 ralloc_free(sub_name
);
1993 var
->data
.used
= true;
1994 result
= new(ctx
) ir_dereference_variable(var
);
1996 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
1998 && result
->variable_referenced()->data
.assigned
!= true
1999 && !is_gl_identifier(var
->name
)) {
2000 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
2001 this->primary_expression
.identifier
);
2004 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
2005 this->primary_expression
.identifier
);
2007 result
= ir_rvalue::error_value(ctx
);
2008 error_emitted
= true;
2013 case ast_int_constant
:
2014 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
2017 case ast_uint_constant
:
2018 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
2021 case ast_float_constant
:
2022 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
2025 case ast_bool_constant
:
2026 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2029 case ast_double_constant
:
2030 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2033 case ast_uint64_constant
:
2034 result
= new(ctx
) ir_constant(this->primary_expression
.uint64_constant
);
2037 case ast_int64_constant
:
2038 result
= new(ctx
) ir_constant(this->primary_expression
.int64_constant
);
2041 case ast_sequence
: {
2042 /* It should not be possible to generate a sequence in the AST without
2043 * any expressions in it.
2045 assert(!this->expressions
.is_empty());
2047 /* The r-value of a sequence is the last expression in the sequence. If
2048 * the other expressions in the sequence do not have side-effects (and
2049 * therefore add instructions to the instruction list), they get dropped
2052 exec_node
*previous_tail
= NULL
;
2053 YYLTYPE previous_operand_loc
= loc
;
2055 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2056 /* If one of the operands of comma operator does not generate any
2057 * code, we want to emit a warning. At each pass through the loop
2058 * previous_tail will point to the last instruction in the stream
2059 * *before* processing the previous operand. Naturally,
2060 * instructions->get_tail_raw() will point to the last instruction in
2061 * the stream *after* processing the previous operand. If the two
2062 * pointers match, then the previous operand had no effect.
2064 * The warning behavior here differs slightly from GCC. GCC will
2065 * only emit a warning if none of the left-hand operands have an
2066 * effect. However, it will emit a warning for each. I believe that
2067 * there are some cases in C (especially with GCC extensions) where
2068 * it is useful to have an intermediate step in a sequence have no
2069 * effect, but I don't think these cases exist in GLSL. Either way,
2070 * it would be a giant hassle to replicate that behavior.
2072 if (previous_tail
== instructions
->get_tail_raw()) {
2073 _mesa_glsl_warning(&previous_operand_loc
, state
,
2074 "left-hand operand of comma expression has "
2078 /* The tail is directly accessed instead of using the get_tail()
2079 * method for performance reasons. get_tail() has extra code to
2080 * return NULL when the list is empty. We don't care about that
2081 * here, so using get_tail_raw() is fine.
2083 previous_tail
= instructions
->get_tail_raw();
2084 previous_operand_loc
= ast
->get_location();
2086 result
= ast
->hir(instructions
, state
);
2089 /* Any errors should have already been emitted in the loop above.
2091 error_emitted
= true;
2095 type
= NULL
; /* use result->type, not type. */
2096 assert(result
!= NULL
|| !needs_rvalue
);
2098 if (result
&& result
->type
->is_error() && !error_emitted
)
2099 _mesa_glsl_error(& loc
, state
, "type mismatch");
2105 ast_expression::has_sequence_subexpression() const
2107 switch (this->oper
) {
2116 return this->subexpressions
[0]->has_sequence_subexpression();
2138 case ast_array_index
:
2139 case ast_mul_assign
:
2140 case ast_div_assign
:
2141 case ast_add_assign
:
2142 case ast_sub_assign
:
2143 case ast_mod_assign
:
2146 case ast_and_assign
:
2147 case ast_xor_assign
:
2149 return this->subexpressions
[0]->has_sequence_subexpression() ||
2150 this->subexpressions
[1]->has_sequence_subexpression();
2152 case ast_conditional
:
2153 return this->subexpressions
[0]->has_sequence_subexpression() ||
2154 this->subexpressions
[1]->has_sequence_subexpression() ||
2155 this->subexpressions
[2]->has_sequence_subexpression();
2160 case ast_field_selection
:
2161 case ast_identifier
:
2162 case ast_int_constant
:
2163 case ast_uint_constant
:
2164 case ast_float_constant
:
2165 case ast_bool_constant
:
2166 case ast_double_constant
:
2167 case ast_int64_constant
:
2168 case ast_uint64_constant
:
2174 case ast_function_call
:
2175 unreachable("should be handled by ast_function_expression::hir");
2177 case ast_unsized_array_dim
:
2178 unreachable("ast_unsized_array_dim: Should never get here.");
2185 ast_expression_statement::hir(exec_list
*instructions
,
2186 struct _mesa_glsl_parse_state
*state
)
2188 /* It is possible to have expression statements that don't have an
2189 * expression. This is the solitary semicolon:
2191 * for (i = 0; i < 5; i++)
2194 * In this case the expression will be NULL. Test for NULL and don't do
2195 * anything in that case.
2197 if (expression
!= NULL
)
2198 expression
->hir_no_rvalue(instructions
, state
);
2200 /* Statements do not have r-values.
2207 ast_compound_statement::hir(exec_list
*instructions
,
2208 struct _mesa_glsl_parse_state
*state
)
2211 state
->symbols
->push_scope();
2213 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2214 ast
->hir(instructions
, state
);
2217 state
->symbols
->pop_scope();
2219 /* Compound statements do not have r-values.
2225 * Evaluate the given exec_node (which should be an ast_node representing
2226 * a single array dimension) and return its integer value.
2229 process_array_size(exec_node
*node
,
2230 struct _mesa_glsl_parse_state
*state
)
2232 void *mem_ctx
= state
;
2234 exec_list dummy_instructions
;
2236 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2239 * Dimensions other than the outermost dimension can by unsized if they
2240 * are immediately sized by a constructor or initializer.
2242 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2245 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2246 YYLTYPE loc
= array_size
->get_location();
2249 _mesa_glsl_error(& loc
, state
,
2250 "array size could not be resolved");
2254 if (!ir
->type
->is_integer()) {
2255 _mesa_glsl_error(& loc
, state
,
2256 "array size must be integer type");
2260 if (!ir
->type
->is_scalar()) {
2261 _mesa_glsl_error(& loc
, state
,
2262 "array size must be scalar type");
2266 ir_constant
*const size
= ir
->constant_expression_value(mem_ctx
);
2268 (state
->is_version(120, 300) &&
2269 array_size
->has_sequence_subexpression())) {
2270 _mesa_glsl_error(& loc
, state
, "array size must be a "
2271 "constant valued expression");
2275 if (size
->value
.i
[0] <= 0) {
2276 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2280 assert(size
->type
== ir
->type
);
2282 /* If the array size is const (and we've verified that
2283 * it is) then no instructions should have been emitted
2284 * when we converted it to HIR. If they were emitted,
2285 * then either the array size isn't const after all, or
2286 * we are emitting unnecessary instructions.
2288 assert(dummy_instructions
.is_empty());
2290 return size
->value
.u
[0];
2293 static const glsl_type
*
2294 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2295 ast_array_specifier
*array_specifier
,
2296 struct _mesa_glsl_parse_state
*state
)
2298 const glsl_type
*array_type
= base
;
2300 if (array_specifier
!= NULL
) {
2301 if (base
->is_array()) {
2303 /* From page 19 (page 25) of the GLSL 1.20 spec:
2305 * "Only one-dimensional arrays may be declared."
2307 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2308 return glsl_type::error_type
;
2312 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2313 !node
->is_head_sentinel(); node
= node
->prev
) {
2314 unsigned array_size
= process_array_size(node
, state
);
2315 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2323 precision_qualifier_allowed(const glsl_type
*type
)
2325 /* Precision qualifiers apply to floating point, integer and opaque
2328 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2329 * "Any floating point or any integer declaration can have the type
2330 * preceded by one of these precision qualifiers [...] Literal
2331 * constants do not have precision qualifiers. Neither do Boolean
2334 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2337 * "Precision qualifiers are added for code portability with OpenGL
2338 * ES, not for functionality. They have the same syntax as in OpenGL
2341 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2343 * "uniform lowp sampler2D sampler;
2346 * lowp vec4 col = texture2D (sampler, coord);
2347 * // texture2D returns lowp"
2349 * From this, we infer that GLSL 1.30 (and later) should allow precision
2350 * qualifiers on sampler types just like float and integer types.
2352 const glsl_type
*const t
= type
->without_array();
2354 return (t
->is_float() || t
->is_integer() || t
->contains_opaque()) &&
2359 ast_type_specifier::glsl_type(const char **name
,
2360 struct _mesa_glsl_parse_state
*state
) const
2362 const struct glsl_type
*type
;
2365 type
= structure
->type
;
2367 type
= state
->symbols
->get_type(this->type_name
);
2368 *name
= this->type_name
;
2370 YYLTYPE loc
= this->get_location();
2371 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2377 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2379 * "The precision statement
2381 * precision precision-qualifier type;
2383 * can be used to establish a default precision qualifier. The type field can
2384 * be either int or float or any of the sampler types, (...) If type is float,
2385 * the directive applies to non-precision-qualified floating point type
2386 * (scalar, vector, and matrix) declarations. If type is int, the directive
2387 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2388 * and unsigned) declarations."
2390 * We use the symbol table to keep the values of the default precisions for
2391 * each 'type' in each scope and we use the 'type' string from the precision
2392 * statement as key in the symbol table. When we want to retrieve the default
2393 * precision associated with a given glsl_type we need to know the type string
2394 * associated with it. This is what this function returns.
2397 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2399 switch (type
->base_type
) {
2400 case GLSL_TYPE_FLOAT
:
2402 case GLSL_TYPE_UINT
:
2405 case GLSL_TYPE_ATOMIC_UINT
:
2406 return "atomic_uint";
2407 case GLSL_TYPE_IMAGE
:
2409 case GLSL_TYPE_SAMPLER
: {
2410 const unsigned type_idx
=
2411 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2412 const unsigned offset
= type
->is_sampler() ? 0 : 4;
2413 assert(type_idx
< 4);
2414 switch (type
->sampled_type
) {
2415 case GLSL_TYPE_FLOAT
:
2416 switch (type
->sampler_dimensionality
) {
2417 case GLSL_SAMPLER_DIM_1D
: {
2418 assert(type
->is_sampler());
2419 static const char *const names
[4] = {
2420 "sampler1D", "sampler1DArray",
2421 "sampler1DShadow", "sampler1DArrayShadow"
2423 return names
[type_idx
];
2425 case GLSL_SAMPLER_DIM_2D
: {
2426 static const char *const names
[8] = {
2427 "sampler2D", "sampler2DArray",
2428 "sampler2DShadow", "sampler2DArrayShadow",
2429 "image2D", "image2DArray", NULL
, NULL
2431 return names
[offset
+ type_idx
];
2433 case GLSL_SAMPLER_DIM_3D
: {
2434 static const char *const names
[8] = {
2435 "sampler3D", NULL
, NULL
, NULL
,
2436 "image3D", NULL
, NULL
, NULL
2438 return names
[offset
+ type_idx
];
2440 case GLSL_SAMPLER_DIM_CUBE
: {
2441 static const char *const names
[8] = {
2442 "samplerCube", "samplerCubeArray",
2443 "samplerCubeShadow", "samplerCubeArrayShadow",
2444 "imageCube", NULL
, NULL
, NULL
2446 return names
[offset
+ type_idx
];
2448 case GLSL_SAMPLER_DIM_MS
: {
2449 assert(type
->is_sampler());
2450 static const char *const names
[4] = {
2451 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2453 return names
[type_idx
];
2455 case GLSL_SAMPLER_DIM_RECT
: {
2456 assert(type
->is_sampler());
2457 static const char *const names
[4] = {
2458 "samplerRect", NULL
, "samplerRectShadow", NULL
2460 return names
[type_idx
];
2462 case GLSL_SAMPLER_DIM_BUF
: {
2463 static const char *const names
[8] = {
2464 "samplerBuffer", NULL
, NULL
, NULL
,
2465 "imageBuffer", NULL
, NULL
, NULL
2467 return names
[offset
+ type_idx
];
2469 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2470 assert(type
->is_sampler());
2471 static const char *const names
[4] = {
2472 "samplerExternalOES", NULL
, NULL
, NULL
2474 return names
[type_idx
];
2477 unreachable("Unsupported sampler/image dimensionality");
2478 } /* sampler/image float dimensionality */
2481 switch (type
->sampler_dimensionality
) {
2482 case GLSL_SAMPLER_DIM_1D
: {
2483 assert(type
->is_sampler());
2484 static const char *const names
[4] = {
2485 "isampler1D", "isampler1DArray", NULL
, NULL
2487 return names
[type_idx
];
2489 case GLSL_SAMPLER_DIM_2D
: {
2490 static const char *const names
[8] = {
2491 "isampler2D", "isampler2DArray", NULL
, NULL
,
2492 "iimage2D", "iimage2DArray", NULL
, NULL
2494 return names
[offset
+ type_idx
];
2496 case GLSL_SAMPLER_DIM_3D
: {
2497 static const char *const names
[8] = {
2498 "isampler3D", NULL
, NULL
, NULL
,
2499 "iimage3D", NULL
, NULL
, NULL
2501 return names
[offset
+ type_idx
];
2503 case GLSL_SAMPLER_DIM_CUBE
: {
2504 static const char *const names
[8] = {
2505 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2506 "iimageCube", NULL
, NULL
, NULL
2508 return names
[offset
+ type_idx
];
2510 case GLSL_SAMPLER_DIM_MS
: {
2511 assert(type
->is_sampler());
2512 static const char *const names
[4] = {
2513 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2515 return names
[type_idx
];
2517 case GLSL_SAMPLER_DIM_RECT
: {
2518 assert(type
->is_sampler());
2519 static const char *const names
[4] = {
2520 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2522 return names
[type_idx
];
2524 case GLSL_SAMPLER_DIM_BUF
: {
2525 static const char *const names
[8] = {
2526 "isamplerBuffer", NULL
, NULL
, NULL
,
2527 "iimageBuffer", NULL
, NULL
, NULL
2529 return names
[offset
+ type_idx
];
2532 unreachable("Unsupported isampler/iimage dimensionality");
2533 } /* sampler/image int dimensionality */
2535 case GLSL_TYPE_UINT
:
2536 switch (type
->sampler_dimensionality
) {
2537 case GLSL_SAMPLER_DIM_1D
: {
2538 assert(type
->is_sampler());
2539 static const char *const names
[4] = {
2540 "usampler1D", "usampler1DArray", NULL
, NULL
2542 return names
[type_idx
];
2544 case GLSL_SAMPLER_DIM_2D
: {
2545 static const char *const names
[8] = {
2546 "usampler2D", "usampler2DArray", NULL
, NULL
,
2547 "uimage2D", "uimage2DArray", NULL
, NULL
2549 return names
[offset
+ type_idx
];
2551 case GLSL_SAMPLER_DIM_3D
: {
2552 static const char *const names
[8] = {
2553 "usampler3D", NULL
, NULL
, NULL
,
2554 "uimage3D", NULL
, NULL
, NULL
2556 return names
[offset
+ type_idx
];
2558 case GLSL_SAMPLER_DIM_CUBE
: {
2559 static const char *const names
[8] = {
2560 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2561 "uimageCube", NULL
, NULL
, NULL
2563 return names
[offset
+ type_idx
];
2565 case GLSL_SAMPLER_DIM_MS
: {
2566 assert(type
->is_sampler());
2567 static const char *const names
[4] = {
2568 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2570 return names
[type_idx
];
2572 case GLSL_SAMPLER_DIM_RECT
: {
2573 assert(type
->is_sampler());
2574 static const char *const names
[4] = {
2575 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2577 return names
[type_idx
];
2579 case GLSL_SAMPLER_DIM_BUF
: {
2580 static const char *const names
[8] = {
2581 "usamplerBuffer", NULL
, NULL
, NULL
,
2582 "uimageBuffer", NULL
, NULL
, NULL
2584 return names
[offset
+ type_idx
];
2587 unreachable("Unsupported usampler/uimage dimensionality");
2588 } /* sampler/image uint dimensionality */
2591 unreachable("Unsupported sampler/image type");
2592 } /* sampler/image type */
2594 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2597 unreachable("Unsupported type");
2602 select_gles_precision(unsigned qual_precision
,
2603 const glsl_type
*type
,
2604 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2606 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2607 * In GLES we take the precision from the type qualifier if present,
2608 * otherwise, if the type of the variable allows precision qualifiers at
2609 * all, we look for the default precision qualifier for that type in the
2612 assert(state
->es_shader
);
2614 unsigned precision
= GLSL_PRECISION_NONE
;
2615 if (qual_precision
) {
2616 precision
= qual_precision
;
2617 } else if (precision_qualifier_allowed(type
)) {
2618 const char *type_name
=
2619 get_type_name_for_precision_qualifier(type
->without_array());
2620 assert(type_name
!= NULL
);
2623 state
->symbols
->get_default_precision_qualifier(type_name
);
2624 if (precision
== ast_precision_none
) {
2625 _mesa_glsl_error(loc
, state
,
2626 "No precision specified in this scope for type `%s'",
2632 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2634 * "The default precision of all atomic types is highp. It is an error to
2635 * declare an atomic type with a different precision or to specify the
2636 * default precision for an atomic type to be lowp or mediump."
2638 if (type
->is_atomic_uint() && precision
!= ast_precision_high
) {
2639 _mesa_glsl_error(loc
, state
,
2640 "atomic_uint can only have highp precision qualifier");
2647 ast_fully_specified_type::glsl_type(const char **name
,
2648 struct _mesa_glsl_parse_state
*state
) const
2650 return this->specifier
->glsl_type(name
, state
);
2654 * Determine whether a toplevel variable declaration declares a varying. This
2655 * function operates by examining the variable's mode and the shader target,
2656 * so it correctly identifies linkage variables regardless of whether they are
2657 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2659 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2660 * this function will produce undefined results.
2663 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2666 case MESA_SHADER_VERTEX
:
2667 return var
->data
.mode
== ir_var_shader_out
;
2668 case MESA_SHADER_FRAGMENT
:
2669 return var
->data
.mode
== ir_var_shader_in
;
2671 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2676 is_allowed_invariant(ir_variable
*var
, struct _mesa_glsl_parse_state
*state
)
2678 if (is_varying_var(var
, state
->stage
))
2681 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
2682 * "Only variables output from a vertex shader can be candidates
2685 if (!state
->is_version(130, 0))
2689 * Later specs remove this language - so allowed invariant
2690 * on fragment shader outputs as well.
2692 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
2693 var
->data
.mode
== ir_var_shader_out
)
2699 * Matrix layout qualifiers are only allowed on certain types
2702 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2704 const glsl_type
*type
,
2707 if (var
&& !var
->is_in_buffer_block()) {
2708 /* Layout qualifiers may only apply to interface blocks and fields in
2711 _mesa_glsl_error(loc
, state
,
2712 "uniform block layout qualifiers row_major and "
2713 "column_major may not be applied to variables "
2714 "outside of uniform blocks");
2715 } else if (!type
->without_array()->is_matrix()) {
2716 /* The OpenGL ES 3.0 conformance tests did not originally allow
2717 * matrix layout qualifiers on non-matrices. However, the OpenGL
2718 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2719 * amended to specifically allow these layouts on all types. Emit
2720 * a warning so that people know their code may not be portable.
2722 _mesa_glsl_warning(loc
, state
,
2723 "uniform block layout qualifiers row_major and "
2724 "column_major applied to non-matrix types may "
2725 "be rejected by older compilers");
2730 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2731 struct _mesa_glsl_parse_state
*state
,
2732 unsigned xfb_buffer
) {
2733 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2734 _mesa_glsl_error(loc
, state
,
2735 "invalid xfb_buffer specified %d is larger than "
2736 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2738 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2745 /* From the ARB_enhanced_layouts spec:
2747 * "Variables and block members qualified with *xfb_offset* can be
2748 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2749 * The offset must be a multiple of the size of the first component of
2750 * the first qualified variable or block member, or a compile-time error
2751 * results. Further, if applied to an aggregate containing a double,
2752 * the offset must also be a multiple of 8, and the space taken in the
2753 * buffer will be a multiple of 8.
2756 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2757 struct _mesa_glsl_parse_state
*state
,
2758 int xfb_offset
, const glsl_type
*type
,
2759 unsigned component_size
) {
2760 const glsl_type
*t_without_array
= type
->without_array();
2762 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2763 _mesa_glsl_error(loc
, state
,
2764 "xfb_offset can't be used with unsized arrays.");
2768 /* Make sure nested structs don't contain unsized arrays, and validate
2769 * any xfb_offsets on interface members.
2771 if (t_without_array
->is_record() || t_without_array
->is_interface())
2772 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2773 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2775 /* When the interface block doesn't have an xfb_offset qualifier then
2776 * we apply the component size rules at the member level.
2778 if (xfb_offset
== -1)
2779 component_size
= member_t
->contains_double() ? 8 : 4;
2781 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2782 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2786 /* Nested structs or interface block without offset may not have had an
2787 * offset applied yet so return.
2789 if (xfb_offset
== -1) {
2793 if (xfb_offset
% component_size
) {
2794 _mesa_glsl_error(loc
, state
,
2795 "invalid qualifier xfb_offset=%d must be a multiple "
2796 "of the first component size of the first qualified "
2797 "variable or block member. Or double if an aggregate "
2798 "that contains a double (%d).",
2799 xfb_offset
, component_size
);
2807 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2810 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2811 _mesa_glsl_error(loc
, state
,
2812 "invalid stream specified %d is larger than "
2813 "MAX_VERTEX_STREAMS - 1 (%d).",
2814 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2822 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2825 const glsl_type
*type
,
2826 const ast_type_qualifier
*qual
)
2828 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2829 _mesa_glsl_error(loc
, state
,
2830 "the \"binding\" qualifier only applies to uniforms and "
2831 "shader storage buffer objects");
2835 unsigned qual_binding
;
2836 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2841 const struct gl_context
*const ctx
= state
->ctx
;
2842 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2843 unsigned max_index
= qual_binding
+ elements
- 1;
2844 const glsl_type
*base_type
= type
->without_array();
2846 if (base_type
->is_interface()) {
2847 /* UBOs. From page 60 of the GLSL 4.20 specification:
2848 * "If the binding point for any uniform block instance is less than zero,
2849 * or greater than or equal to the implementation-dependent maximum
2850 * number of uniform buffer bindings, a compilation error will occur.
2851 * When the binding identifier is used with a uniform block instanced as
2852 * an array of size N, all elements of the array from binding through
2853 * binding + N – 1 must be within this range."
2855 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2857 if (qual
->flags
.q
.uniform
&&
2858 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2859 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2860 "the maximum number of UBO binding points (%d)",
2861 qual_binding
, elements
,
2862 ctx
->Const
.MaxUniformBufferBindings
);
2866 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2867 * "If the binding point for any uniform or shader storage block instance
2868 * is less than zero, or greater than or equal to the
2869 * implementation-dependent maximum number of uniform buffer bindings, a
2870 * compile-time error will occur. When the binding identifier is used
2871 * with a uniform or shader storage block instanced as an array of size
2872 * N, all elements of the array from binding through binding + N – 1 must
2873 * be within this range."
2875 if (qual
->flags
.q
.buffer
&&
2876 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2877 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2878 "the maximum number of SSBO binding points (%d)",
2879 qual_binding
, elements
,
2880 ctx
->Const
.MaxShaderStorageBufferBindings
);
2883 } else if (base_type
->is_sampler()) {
2884 /* Samplers. From page 63 of the GLSL 4.20 specification:
2885 * "If the binding is less than zero, or greater than or equal to the
2886 * implementation-dependent maximum supported number of units, a
2887 * compilation error will occur. When the binding identifier is used
2888 * with an array of size N, all elements of the array from binding
2889 * through binding + N - 1 must be within this range."
2891 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2893 if (max_index
>= limit
) {
2894 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2895 "exceeds the maximum number of texture image units "
2896 "(%u)", qual_binding
, elements
, limit
);
2900 } else if (base_type
->contains_atomic()) {
2901 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2902 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2903 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2904 "maximum number of atomic counter buffer bindings "
2905 "(%u)", qual_binding
,
2906 ctx
->Const
.MaxAtomicBufferBindings
);
2910 } else if ((state
->is_version(420, 310) ||
2911 state
->ARB_shading_language_420pack_enable
) &&
2912 base_type
->is_image()) {
2913 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2914 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2915 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2916 "maximum number of image units (%d)", max_index
,
2917 ctx
->Const
.MaxImageUnits
);
2922 _mesa_glsl_error(loc
, state
,
2923 "the \"binding\" qualifier only applies to uniform "
2924 "blocks, storage blocks, opaque variables, or arrays "
2929 var
->data
.explicit_binding
= true;
2930 var
->data
.binding
= qual_binding
;
2936 validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state
*state
,
2938 const glsl_interp_mode interpolation
,
2939 const struct glsl_type
*var_type
,
2940 ir_variable_mode mode
)
2942 if (state
->stage
!= MESA_SHADER_FRAGMENT
||
2943 interpolation
== INTERP_MODE_FLAT
||
2944 mode
!= ir_var_shader_in
)
2947 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2948 * so must integer vertex outputs.
2950 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2951 * "Fragment shader inputs that are signed or unsigned integers or
2952 * integer vectors must be qualified with the interpolation qualifier
2955 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2956 * "Fragment shader inputs that are, or contain, signed or unsigned
2957 * integers or integer vectors must be qualified with the
2958 * interpolation qualifier flat."
2960 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2961 * "Vertex shader outputs that are, or contain, signed or unsigned
2962 * integers or integer vectors must be qualified with the
2963 * interpolation qualifier flat."
2965 * Note that prior to GLSL 1.50, this requirement applied to vertex
2966 * outputs rather than fragment inputs. That creates problems in the
2967 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2968 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2969 * apply the restriction to both vertex outputs and fragment inputs.
2971 * Note also that the desktop GLSL specs are missing the text "or
2972 * contain"; this is presumably an oversight, since there is no
2973 * reasonable way to interpolate a fragment shader input that contains
2974 * an integer. See Khronos bug #15671.
2976 if (state
->is_version(130, 300)
2977 && var_type
->contains_integer()) {
2978 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
2979 "an integer, then it must be qualified with 'flat'");
2982 /* Double fragment inputs must be qualified with 'flat'.
2984 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
2985 * "This extension does not support interpolation of double-precision
2986 * values; doubles used as fragment shader inputs must be qualified as
2989 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
2990 * "Fragment shader inputs that are signed or unsigned integers, integer
2991 * vectors, or any double-precision floating-point type must be
2992 * qualified with the interpolation qualifier flat."
2994 * Note that the GLSL specs are missing the text "or contain"; this is
2995 * presumably an oversight. See Khronos bug #15671.
2997 * The 'double' type does not exist in GLSL ES so far.
2999 if (state
->has_double()
3000 && var_type
->contains_double()) {
3001 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3002 "a double, then it must be qualified with 'flat'");
3005 /* Bindless sampler/image fragment inputs must be qualified with 'flat'.
3007 * From section 4.3.4 of the ARB_bindless_texture spec:
3009 * "(modify last paragraph, p. 35, allowing samplers and images as
3010 * fragment shader inputs) ... Fragment inputs can only be signed and
3011 * unsigned integers and integer vectors, floating point scalars,
3012 * floating-point vectors, matrices, sampler and image types, or arrays
3013 * or structures of these. Fragment shader inputs that are signed or
3014 * unsigned integers, integer vectors, or any double-precision floating-
3015 * point type, or any sampler or image type must be qualified with the
3016 * interpolation qualifier "flat"."
3018 if (state
->has_bindless()
3019 && (var_type
->contains_sampler() || var_type
->contains_image())) {
3020 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3021 "a bindless sampler (or image), then it must be "
3022 "qualified with 'flat'");
3027 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
3029 const glsl_interp_mode interpolation
,
3030 const struct ast_type_qualifier
*qual
,
3031 const struct glsl_type
*var_type
,
3032 ir_variable_mode mode
)
3034 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
3035 * not to vertex shader inputs nor fragment shader outputs.
3037 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3038 * "Outputs from a vertex shader (out) and inputs to a fragment
3039 * shader (in) can be further qualified with one or more of these
3040 * interpolation qualifiers"
3042 * "These interpolation qualifiers may only precede the qualifiers in,
3043 * centroid in, out, or centroid out in a declaration. They do not apply
3044 * to the deprecated storage qualifiers varying or centroid
3045 * varying. They also do not apply to inputs into a vertex shader or
3046 * outputs from a fragment shader."
3048 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
3049 * "Outputs from a shader (out) and inputs to a shader (in) can be
3050 * further qualified with one of these interpolation qualifiers."
3052 * "These interpolation qualifiers may only precede the qualifiers
3053 * in, centroid in, out, or centroid out in a declaration. They do
3054 * not apply to inputs into a vertex shader or outputs from a
3057 if (state
->is_version(130, 300)
3058 && interpolation
!= INTERP_MODE_NONE
) {
3059 const char *i
= interpolation_string(interpolation
);
3060 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
3061 _mesa_glsl_error(loc
, state
,
3062 "interpolation qualifier `%s' can only be applied to "
3063 "shader inputs or outputs.", i
);
3065 switch (state
->stage
) {
3066 case MESA_SHADER_VERTEX
:
3067 if (mode
== ir_var_shader_in
) {
3068 _mesa_glsl_error(loc
, state
,
3069 "interpolation qualifier '%s' cannot be applied to "
3070 "vertex shader inputs", i
);
3073 case MESA_SHADER_FRAGMENT
:
3074 if (mode
== ir_var_shader_out
) {
3075 _mesa_glsl_error(loc
, state
,
3076 "interpolation qualifier '%s' cannot be applied to "
3077 "fragment shader outputs", i
);
3085 /* Interpolation qualifiers cannot be applied to 'centroid' and
3086 * 'centroid varying'.
3088 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3089 * "interpolation qualifiers may only precede the qualifiers in,
3090 * centroid in, out, or centroid out in a declaration. They do not apply
3091 * to the deprecated storage qualifiers varying or centroid varying."
3093 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3095 if (state
->is_version(130, 0)
3096 && interpolation
!= INTERP_MODE_NONE
3097 && qual
->flags
.q
.varying
) {
3099 const char *i
= interpolation_string(interpolation
);
3101 if (qual
->flags
.q
.centroid
)
3102 s
= "centroid varying";
3106 _mesa_glsl_error(loc
, state
,
3107 "qualifier '%s' cannot be applied to the "
3108 "deprecated storage qualifier '%s'", i
, s
);
3111 validate_fragment_flat_interpolation_input(state
, loc
, interpolation
,
3115 static glsl_interp_mode
3116 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3117 const struct glsl_type
*var_type
,
3118 ir_variable_mode mode
,
3119 struct _mesa_glsl_parse_state
*state
,
3122 glsl_interp_mode interpolation
;
3123 if (qual
->flags
.q
.flat
)
3124 interpolation
= INTERP_MODE_FLAT
;
3125 else if (qual
->flags
.q
.noperspective
)
3126 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3127 else if (qual
->flags
.q
.smooth
)
3128 interpolation
= INTERP_MODE_SMOOTH
;
3129 else if (state
->es_shader
&&
3130 ((mode
== ir_var_shader_in
&&
3131 state
->stage
!= MESA_SHADER_VERTEX
) ||
3132 (mode
== ir_var_shader_out
&&
3133 state
->stage
!= MESA_SHADER_FRAGMENT
)))
3134 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
3136 * "When no interpolation qualifier is present, smooth interpolation
3139 interpolation
= INTERP_MODE_SMOOTH
;
3141 interpolation
= INTERP_MODE_NONE
;
3143 validate_interpolation_qualifier(state
, loc
,
3145 qual
, var_type
, mode
);
3147 return interpolation
;
3152 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3154 struct _mesa_glsl_parse_state
*state
,
3159 unsigned qual_location
;
3160 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3165 /* Checks for GL_ARB_explicit_uniform_location. */
3166 if (qual
->flags
.q
.uniform
) {
3167 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3170 const struct gl_context
*const ctx
= state
->ctx
;
3171 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3173 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3174 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3175 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3176 ctx
->Const
.MaxUserAssignableUniformLocations
);
3180 var
->data
.explicit_location
= true;
3181 var
->data
.location
= qual_location
;
3185 /* Between GL_ARB_explicit_attrib_location an
3186 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3187 * stage can be assigned explicit locations. The checking here associates
3188 * the correct extension with the correct stage's input / output:
3192 * vertex explicit_loc sso
3193 * tess control sso sso
3196 * fragment sso explicit_loc
3198 switch (state
->stage
) {
3199 case MESA_SHADER_VERTEX
:
3200 if (var
->data
.mode
== ir_var_shader_in
) {
3201 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3207 if (var
->data
.mode
== ir_var_shader_out
) {
3208 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3217 case MESA_SHADER_TESS_CTRL
:
3218 case MESA_SHADER_TESS_EVAL
:
3219 case MESA_SHADER_GEOMETRY
:
3220 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3221 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3230 case MESA_SHADER_FRAGMENT
:
3231 if (var
->data
.mode
== ir_var_shader_in
) {
3232 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3238 if (var
->data
.mode
== ir_var_shader_out
) {
3239 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3248 case MESA_SHADER_COMPUTE
:
3249 _mesa_glsl_error(loc
, state
,
3250 "compute shader variables cannot be given "
3251 "explicit locations");
3259 _mesa_glsl_error(loc
, state
,
3260 "%s cannot be given an explicit location in %s shader",
3262 _mesa_shader_stage_to_string(state
->stage
));
3264 var
->data
.explicit_location
= true;
3266 switch (state
->stage
) {
3267 case MESA_SHADER_VERTEX
:
3268 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3269 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3270 : (qual_location
+ VARYING_SLOT_VAR0
);
3273 case MESA_SHADER_TESS_CTRL
:
3274 case MESA_SHADER_TESS_EVAL
:
3275 case MESA_SHADER_GEOMETRY
:
3276 if (var
->data
.patch
)
3277 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3279 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3282 case MESA_SHADER_FRAGMENT
:
3283 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3284 ? (qual_location
+ FRAG_RESULT_DATA0
)
3285 : (qual_location
+ VARYING_SLOT_VAR0
);
3288 assert(!"Unexpected shader type");
3292 /* Check if index was set for the uniform instead of the function */
3293 if (qual
->flags
.q
.explicit_index
&& qual
->is_subroutine_decl()) {
3294 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3295 "used with subroutine functions");
3299 unsigned qual_index
;
3300 if (qual
->flags
.q
.explicit_index
&&
3301 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3303 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3304 * Layout Qualifiers):
3306 * "It is also a compile-time error if a fragment shader
3307 * sets a layout index to less than 0 or greater than 1."
3309 * Older specifications don't mandate a behavior; we take
3310 * this as a clarification and always generate the error.
3312 if (qual_index
> 1) {
3313 _mesa_glsl_error(loc
, state
,
3314 "explicit index may only be 0 or 1");
3316 var
->data
.explicit_index
= true;
3317 var
->data
.index
= qual_index
;
3324 validate_storage_for_sampler_image_types(ir_variable
*var
,
3325 struct _mesa_glsl_parse_state
*state
,
3328 /* From section 4.1.7 of the GLSL 4.40 spec:
3330 * "[Opaque types] can only be declared as function
3331 * parameters or uniform-qualified variables."
3333 * From section 4.1.7 of the ARB_bindless_texture spec:
3335 * "Samplers may be declared as shader inputs and outputs, as uniform
3336 * variables, as temporary variables, and as function parameters."
3338 * From section 4.1.X of the ARB_bindless_texture spec:
3340 * "Images may be declared as shader inputs and outputs, as uniform
3341 * variables, as temporary variables, and as function parameters."
3343 if (state
->has_bindless()) {
3344 if (var
->data
.mode
!= ir_var_auto
&&
3345 var
->data
.mode
!= ir_var_uniform
&&
3346 var
->data
.mode
!= ir_var_shader_in
&&
3347 var
->data
.mode
!= ir_var_shader_out
&&
3348 var
->data
.mode
!= ir_var_function_in
&&
3349 var
->data
.mode
!= ir_var_function_out
&&
3350 var
->data
.mode
!= ir_var_function_inout
) {
3351 _mesa_glsl_error(loc
, state
, "bindless image/sampler variables may "
3352 "only be declared as shader inputs and outputs, as "
3353 "uniform variables, as temporary variables and as "
3354 "function parameters");
3358 if (var
->data
.mode
!= ir_var_uniform
&&
3359 var
->data
.mode
!= ir_var_function_in
) {
3360 _mesa_glsl_error(loc
, state
, "image/sampler variables may only be "
3361 "declared as function parameters or "
3362 "uniform-qualified global variables");
3370 validate_memory_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3372 const struct ast_type_qualifier
*qual
,
3373 const glsl_type
*type
)
3375 /* From Section 4.10 (Memory Qualifiers) of the GLSL 4.50 spec:
3377 * "Memory qualifiers are only supported in the declarations of image
3378 * variables, buffer variables, and shader storage blocks; it is an error
3379 * to use such qualifiers in any other declarations.
3381 if (!type
->is_image() && !qual
->flags
.q
.buffer
) {
3382 if (qual
->flags
.q
.read_only
||
3383 qual
->flags
.q
.write_only
||
3384 qual
->flags
.q
.coherent
||
3385 qual
->flags
.q
._volatile
||
3386 qual
->flags
.q
.restrict_flag
) {
3387 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied "
3388 "in the declarations of image variables, buffer "
3389 "variables, and shader storage blocks");
3397 validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3399 const struct ast_type_qualifier
*qual
,
3400 const glsl_type
*type
)
3402 /* From section 4.4.6.2 (Format Layout Qualifiers) of the GLSL 4.50 spec:
3404 * "Format layout qualifiers can be used on image variable declarations
3405 * (those declared with a basic type having “image ” in its keyword)."
3407 if (!type
->is_image() && qual
->flags
.q
.explicit_image_format
) {
3408 _mesa_glsl_error(loc
, state
, "format layout qualifiers may only be "
3409 "applied to images");
3416 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3418 struct _mesa_glsl_parse_state
*state
,
3421 const glsl_type
*base_type
= var
->type
->without_array();
3423 if (!validate_image_format_qualifier_for_type(state
, loc
, qual
, base_type
) ||
3424 !validate_memory_qualifier_for_type(state
, loc
, qual
, base_type
))
3427 if (!base_type
->is_image())
3430 if (!validate_storage_for_sampler_image_types(var
, state
, loc
))
3433 var
->data
.memory_read_only
|= qual
->flags
.q
.read_only
;
3434 var
->data
.memory_write_only
|= qual
->flags
.q
.write_only
;
3435 var
->data
.memory_coherent
|= qual
->flags
.q
.coherent
;
3436 var
->data
.memory_volatile
|= qual
->flags
.q
._volatile
;
3437 var
->data
.memory_restrict
|= qual
->flags
.q
.restrict_flag
;
3439 if (qual
->flags
.q
.explicit_image_format
) {
3440 if (var
->data
.mode
== ir_var_function_in
) {
3441 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be used on "
3442 "image function parameters");
3445 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3446 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the base "
3447 "data type of the image");
3450 var
->data
.image_format
= qual
->image_format
;
3452 if (var
->data
.mode
== ir_var_uniform
) {
3453 if (state
->es_shader
) {
3454 _mesa_glsl_error(loc
, state
, "all image uniforms must have a "
3455 "format layout qualifier");
3456 } else if (!qual
->flags
.q
.write_only
) {
3457 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3458 "`writeonly' must have a format layout qualifier");
3461 var
->data
.image_format
= GL_NONE
;
3464 /* From page 70 of the GLSL ES 3.1 specification:
3466 * "Except for image variables qualified with the format qualifiers r32f,
3467 * r32i, and r32ui, image variables must specify either memory qualifier
3468 * readonly or the memory qualifier writeonly."
3470 if (state
->es_shader
&&
3471 var
->data
.image_format
!= GL_R32F
&&
3472 var
->data
.image_format
!= GL_R32I
&&
3473 var
->data
.image_format
!= GL_R32UI
&&
3474 !var
->data
.memory_read_only
&&
3475 !var
->data
.memory_write_only
) {
3476 _mesa_glsl_error(loc
, state
, "image variables of format other than r32f, "
3477 "r32i or r32ui must be qualified `readonly' or "
3482 static inline const char*
3483 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3485 if (origin_upper_left
&& pixel_center_integer
)
3486 return "origin_upper_left, pixel_center_integer";
3487 else if (origin_upper_left
)
3488 return "origin_upper_left";
3489 else if (pixel_center_integer
)
3490 return "pixel_center_integer";
3496 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3497 const struct ast_type_qualifier
*qual
)
3499 /* If gl_FragCoord was previously declared, and the qualifiers were
3500 * different in any way, return true.
3502 if (state
->fs_redeclares_gl_fragcoord
) {
3503 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3504 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3511 validate_array_dimensions(const glsl_type
*t
,
3512 struct _mesa_glsl_parse_state
*state
,
3514 if (t
->is_array()) {
3515 t
= t
->fields
.array
;
3516 while (t
->is_array()) {
3517 if (t
->is_unsized_array()) {
3518 _mesa_glsl_error(loc
, state
,
3519 "only the outermost array dimension can "
3524 t
= t
->fields
.array
;
3530 apply_bindless_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3532 struct _mesa_glsl_parse_state
*state
,
3535 bool has_local_qualifiers
= qual
->flags
.q
.bindless_sampler
||
3536 qual
->flags
.q
.bindless_image
||
3537 qual
->flags
.q
.bound_sampler
||
3538 qual
->flags
.q
.bound_image
;
3540 /* The ARB_bindless_texture spec says:
3542 * "Modify Section 4.4.6 Opaque-Uniform Layout Qualifiers of the GLSL 4.30
3545 * "If these layout qualifiers are applied to other types of default block
3546 * uniforms, or variables with non-uniform storage, a compile-time error
3547 * will be generated."
3549 if (has_local_qualifiers
&& !qual
->flags
.q
.uniform
) {
3550 _mesa_glsl_error(loc
, state
, "ARB_bindless_texture layout qualifiers "
3551 "can only be applied to default block uniforms or "
3552 "variables with uniform storage");
3556 /* The ARB_bindless_texture spec doesn't state anything in this situation,
3557 * but it makes sense to only allow bindless_sampler/bound_sampler for
3558 * sampler types, and respectively bindless_image/bound_image for image
3561 if ((qual
->flags
.q
.bindless_sampler
|| qual
->flags
.q
.bound_sampler
) &&
3562 !var
->type
->contains_sampler()) {
3563 _mesa_glsl_error(loc
, state
, "bindless_sampler or bound_sampler can only "
3564 "be applied to sampler types");
3568 if ((qual
->flags
.q
.bindless_image
|| qual
->flags
.q
.bound_image
) &&
3569 !var
->type
->contains_image()) {
3570 _mesa_glsl_error(loc
, state
, "bindless_image or bound_image can only be "
3571 "applied to image types");
3575 /* The bindless_sampler/bindless_image (and respectively
3576 * bound_sampler/bound_image) layout qualifiers can be set at global and at
3579 if (var
->type
->contains_sampler() || var
->type
->contains_image()) {
3580 var
->data
.bindless
= qual
->flags
.q
.bindless_sampler
||
3581 qual
->flags
.q
.bindless_image
||
3582 state
->bindless_sampler_specified
||
3583 state
->bindless_image_specified
;
3585 var
->data
.bound
= qual
->flags
.q
.bound_sampler
||
3586 qual
->flags
.q
.bound_image
||
3587 state
->bound_sampler_specified
||
3588 state
->bound_image_specified
;
3593 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3595 struct _mesa_glsl_parse_state
*state
,
3598 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3600 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3602 * "Within any shader, the first redeclarations of gl_FragCoord
3603 * must appear before any use of gl_FragCoord."
3605 * Generate a compiler error if above condition is not met by the
3608 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3609 if (earlier
!= NULL
&&
3610 earlier
->data
.used
&&
3611 !state
->fs_redeclares_gl_fragcoord
) {
3612 _mesa_glsl_error(loc
, state
,
3613 "gl_FragCoord used before its first redeclaration "
3614 "in fragment shader");
3617 /* Make sure all gl_FragCoord redeclarations specify the same layout
3620 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3621 const char *const qual_string
=
3622 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3623 qual
->flags
.q
.pixel_center_integer
);
3625 const char *const state_string
=
3626 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3627 state
->fs_pixel_center_integer
);
3629 _mesa_glsl_error(loc
, state
,
3630 "gl_FragCoord redeclared with different layout "
3631 "qualifiers (%s) and (%s) ",
3635 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3636 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3637 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3638 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3639 state
->fs_redeclares_gl_fragcoord
=
3640 state
->fs_origin_upper_left
||
3641 state
->fs_pixel_center_integer
||
3642 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3645 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3646 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3647 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3648 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3649 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3650 ? "origin_upper_left" : "pixel_center_integer";
3652 _mesa_glsl_error(loc
, state
,
3653 "layout qualifier `%s' can only be applied to "
3654 "fragment shader input `gl_FragCoord'",
3658 if (qual
->flags
.q
.explicit_location
) {
3659 apply_explicit_location(qual
, var
, state
, loc
);
3661 if (qual
->flags
.q
.explicit_component
) {
3662 unsigned qual_component
;
3663 if (process_qualifier_constant(state
, loc
, "component",
3664 qual
->component
, &qual_component
)) {
3665 const glsl_type
*type
= var
->type
->without_array();
3666 unsigned components
= type
->component_slots();
3668 if (type
->is_matrix() || type
->is_record()) {
3669 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3670 "cannot be applied to a matrix, a structure, "
3671 "a block, or an array containing any of "
3673 } else if (qual_component
!= 0 &&
3674 (qual_component
+ components
- 1) > 3) {
3675 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3676 (qual_component
+ components
- 1));
3677 } else if (qual_component
== 1 && type
->is_64bit()) {
3678 /* We don't bother checking for 3 as it should be caught by the
3679 * overflow check above.
3681 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3682 "component 1 or 3");
3684 var
->data
.explicit_component
= true;
3685 var
->data
.location_frac
= qual_component
;
3689 } else if (qual
->flags
.q
.explicit_index
) {
3690 if (!qual
->subroutine_list
)
3691 _mesa_glsl_error(loc
, state
,
3692 "explicit index requires explicit location");
3693 } else if (qual
->flags
.q
.explicit_component
) {
3694 _mesa_glsl_error(loc
, state
,
3695 "explicit component requires explicit location");
3698 if (qual
->flags
.q
.explicit_binding
) {
3699 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3702 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3703 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3704 unsigned qual_stream
;
3705 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3707 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3708 var
->data
.stream
= qual_stream
;
3712 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3713 unsigned qual_xfb_buffer
;
3714 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3715 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3716 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3717 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3718 if (qual
->flags
.q
.explicit_xfb_buffer
)
3719 var
->data
.explicit_xfb_buffer
= true;
3723 if (qual
->flags
.q
.explicit_xfb_offset
) {
3724 unsigned qual_xfb_offset
;
3725 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3727 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3728 qual
->offset
, &qual_xfb_offset
) &&
3729 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3730 var
->type
, component_size
)) {
3731 var
->data
.offset
= qual_xfb_offset
;
3732 var
->data
.explicit_xfb_offset
= true;
3736 if (qual
->flags
.q
.explicit_xfb_stride
) {
3737 unsigned qual_xfb_stride
;
3738 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3739 qual
->xfb_stride
, &qual_xfb_stride
)) {
3740 var
->data
.xfb_stride
= qual_xfb_stride
;
3741 var
->data
.explicit_xfb_stride
= true;
3745 if (var
->type
->contains_atomic()) {
3746 if (var
->data
.mode
== ir_var_uniform
) {
3747 if (var
->data
.explicit_binding
) {
3749 &state
->atomic_counter_offsets
[var
->data
.binding
];
3751 if (*offset
% ATOMIC_COUNTER_SIZE
)
3752 _mesa_glsl_error(loc
, state
,
3753 "misaligned atomic counter offset");
3755 var
->data
.offset
= *offset
;
3756 *offset
+= var
->type
->atomic_size();
3759 _mesa_glsl_error(loc
, state
,
3760 "atomic counters require explicit binding point");
3762 } else if (var
->data
.mode
!= ir_var_function_in
) {
3763 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3764 "function parameters or uniform-qualified "
3765 "global variables");
3769 if (var
->type
->contains_sampler() &&
3770 !validate_storage_for_sampler_image_types(var
, state
, loc
))
3773 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3774 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3775 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3776 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3777 * These extensions and all following extensions that add the 'layout'
3778 * keyword have been modified to require the use of 'in' or 'out'.
3780 * The following extension do not allow the deprecated keywords:
3782 * GL_AMD_conservative_depth
3783 * GL_ARB_conservative_depth
3784 * GL_ARB_gpu_shader5
3785 * GL_ARB_separate_shader_objects
3786 * GL_ARB_tessellation_shader
3787 * GL_ARB_transform_feedback3
3788 * GL_ARB_uniform_buffer_object
3790 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3791 * allow layout with the deprecated keywords.
3793 const bool relaxed_layout_qualifier_checking
=
3794 state
->ARB_fragment_coord_conventions_enable
;
3796 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3797 || qual
->flags
.q
.varying
;
3798 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3799 if (relaxed_layout_qualifier_checking
) {
3800 _mesa_glsl_warning(loc
, state
,
3801 "`layout' qualifier may not be used with "
3802 "`attribute' or `varying'");
3804 _mesa_glsl_error(loc
, state
,
3805 "`layout' qualifier may not be used with "
3806 "`attribute' or `varying'");
3810 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3811 * AMD_conservative_depth.
3813 if (qual
->flags
.q
.depth_type
3814 && !state
->is_version(420, 0)
3815 && !state
->AMD_conservative_depth_enable
3816 && !state
->ARB_conservative_depth_enable
) {
3817 _mesa_glsl_error(loc
, state
,
3818 "extension GL_AMD_conservative_depth or "
3819 "GL_ARB_conservative_depth must be enabled "
3820 "to use depth layout qualifiers");
3821 } else if (qual
->flags
.q
.depth_type
3822 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3823 _mesa_glsl_error(loc
, state
,
3824 "depth layout qualifiers can be applied only to "
3828 switch (qual
->depth_type
) {
3830 var
->data
.depth_layout
= ir_depth_layout_any
;
3832 case ast_depth_greater
:
3833 var
->data
.depth_layout
= ir_depth_layout_greater
;
3835 case ast_depth_less
:
3836 var
->data
.depth_layout
= ir_depth_layout_less
;
3838 case ast_depth_unchanged
:
3839 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3842 var
->data
.depth_layout
= ir_depth_layout_none
;
3846 if (qual
->flags
.q
.std140
||
3847 qual
->flags
.q
.std430
||
3848 qual
->flags
.q
.packed
||
3849 qual
->flags
.q
.shared
) {
3850 _mesa_glsl_error(loc
, state
,
3851 "uniform and shader storage block layout qualifiers "
3852 "std140, std430, packed, and shared can only be "
3853 "applied to uniform or shader storage blocks, not "
3857 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3858 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3861 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3864 * "Fragment shaders also allow the following layout qualifier on in only
3865 * (not with variable declarations)
3866 * layout-qualifier-id
3867 * early_fragment_tests
3870 if (qual
->flags
.q
.early_fragment_tests
) {
3871 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3872 "valid in fragment shader input layout declaration.");
3875 if (qual
->flags
.q
.inner_coverage
) {
3876 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3877 "valid in fragment shader input layout declaration.");
3880 if (qual
->flags
.q
.post_depth_coverage
) {
3881 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3882 "valid in fragment shader input layout declaration.");
3885 if (state
->has_bindless())
3886 apply_bindless_qualifier_to_variable(qual
, var
, state
, loc
);
3890 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3892 struct _mesa_glsl_parse_state
*state
,
3896 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3898 if (qual
->flags
.q
.invariant
) {
3899 if (var
->data
.used
) {
3900 _mesa_glsl_error(loc
, state
,
3901 "variable `%s' may not be redeclared "
3902 "`invariant' after being used",
3905 var
->data
.invariant
= 1;
3909 if (qual
->flags
.q
.precise
) {
3910 if (var
->data
.used
) {
3911 _mesa_glsl_error(loc
, state
,
3912 "variable `%s' may not be redeclared "
3913 "`precise' after being used",
3916 var
->data
.precise
= 1;
3920 if (qual
->is_subroutine_decl() && !qual
->flags
.q
.uniform
) {
3921 _mesa_glsl_error(loc
, state
,
3922 "`subroutine' may only be applied to uniforms, "
3923 "subroutine type declarations, or function definitions");
3926 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3927 || qual
->flags
.q
.uniform
3928 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3929 var
->data
.read_only
= 1;
3931 if (qual
->flags
.q
.centroid
)
3932 var
->data
.centroid
= 1;
3934 if (qual
->flags
.q
.sample
)
3935 var
->data
.sample
= 1;
3937 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3938 if (state
->es_shader
) {
3939 var
->data
.precision
=
3940 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3943 if (qual
->flags
.q
.patch
)
3944 var
->data
.patch
= 1;
3946 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3947 var
->type
= glsl_type::error_type
;
3948 _mesa_glsl_error(loc
, state
,
3949 "`attribute' variables may not be declared in the "
3951 _mesa_shader_stage_to_string(state
->stage
));
3954 /* Disallow layout qualifiers which may only appear on layout declarations. */
3955 if (qual
->flags
.q
.prim_type
) {
3956 _mesa_glsl_error(loc
, state
,
3957 "Primitive type may only be specified on GS input or output "
3958 "layout declaration, not on variables.");
3961 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3963 * "However, the const qualifier cannot be used with out or inout."
3965 * The same section of the GLSL 4.40 spec further clarifies this saying:
3967 * "The const qualifier cannot be used with out or inout, or a
3968 * compile-time error results."
3970 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3971 _mesa_glsl_error(loc
, state
,
3972 "`const' may not be applied to `out' or `inout' "
3973 "function parameters");
3976 /* If there is no qualifier that changes the mode of the variable, leave
3977 * the setting alone.
3979 assert(var
->data
.mode
!= ir_var_temporary
);
3980 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3981 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
3982 else if (qual
->flags
.q
.in
)
3983 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3984 else if (qual
->flags
.q
.attribute
3985 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3986 var
->data
.mode
= ir_var_shader_in
;
3987 else if (qual
->flags
.q
.out
)
3988 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3989 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3990 var
->data
.mode
= ir_var_shader_out
;
3991 else if (qual
->flags
.q
.uniform
)
3992 var
->data
.mode
= ir_var_uniform
;
3993 else if (qual
->flags
.q
.buffer
)
3994 var
->data
.mode
= ir_var_shader_storage
;
3995 else if (qual
->flags
.q
.shared_storage
)
3996 var
->data
.mode
= ir_var_shader_shared
;
3998 var
->data
.fb_fetch_output
= state
->stage
== MESA_SHADER_FRAGMENT
&&
3999 qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
4001 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
4002 /* User-defined ins/outs are not permitted in compute shaders. */
4003 if (state
->stage
== MESA_SHADER_COMPUTE
) {
4004 _mesa_glsl_error(loc
, state
,
4005 "user-defined input and output variables are not "
4006 "permitted in compute shaders");
4009 /* This variable is being used to link data between shader stages (in
4010 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
4011 * that is allowed for such purposes.
4013 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
4015 * "The varying qualifier can be used only with the data types
4016 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
4019 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
4020 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
4022 * "Fragment inputs can only be signed and unsigned integers and
4023 * integer vectors, float, floating-point vectors, matrices, or
4024 * arrays of these. Structures cannot be input.
4026 * Similar text exists in the section on vertex shader outputs.
4028 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
4029 * 3.00 spec allows structs as well. Varying structs are also allowed
4032 * From section 4.3.4 of the ARB_bindless_texture spec:
4034 * "(modify third paragraph of the section to allow sampler and image
4035 * types) ... Vertex shader inputs can only be float,
4036 * single-precision floating-point scalars, single-precision
4037 * floating-point vectors, matrices, signed and unsigned integers
4038 * and integer vectors, sampler and image types."
4040 * From section 4.3.6 of the ARB_bindless_texture spec:
4042 * "Output variables can only be floating-point scalars,
4043 * floating-point vectors, matrices, signed or unsigned integers or
4044 * integer vectors, sampler or image types, or arrays or structures
4047 switch (var
->type
->without_array()->base_type
) {
4048 case GLSL_TYPE_FLOAT
:
4049 /* Ok in all GLSL versions */
4051 case GLSL_TYPE_UINT
:
4053 if (state
->is_version(130, 300))
4055 _mesa_glsl_error(loc
, state
,
4056 "varying variables must be of base type float in %s",
4057 state
->get_version_string());
4059 case GLSL_TYPE_STRUCT
:
4060 if (state
->is_version(150, 300))
4062 _mesa_glsl_error(loc
, state
,
4063 "varying variables may not be of type struct");
4065 case GLSL_TYPE_DOUBLE
:
4066 case GLSL_TYPE_UINT64
:
4067 case GLSL_TYPE_INT64
:
4069 case GLSL_TYPE_SAMPLER
:
4070 case GLSL_TYPE_IMAGE
:
4071 if (state
->has_bindless())
4075 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
4080 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
4081 switch (state
->stage
) {
4082 case MESA_SHADER_VERTEX
:
4083 if (var
->data
.mode
== ir_var_shader_out
)
4084 var
->data
.invariant
= true;
4086 case MESA_SHADER_TESS_CTRL
:
4087 case MESA_SHADER_TESS_EVAL
:
4088 case MESA_SHADER_GEOMETRY
:
4089 if ((var
->data
.mode
== ir_var_shader_in
)
4090 || (var
->data
.mode
== ir_var_shader_out
))
4091 var
->data
.invariant
= true;
4093 case MESA_SHADER_FRAGMENT
:
4094 if (var
->data
.mode
== ir_var_shader_in
)
4095 var
->data
.invariant
= true;
4097 case MESA_SHADER_COMPUTE
:
4098 /* Invariance isn't meaningful in compute shaders. */
4105 var
->data
.interpolation
=
4106 interpret_interpolation_qualifier(qual
, var
->type
,
4107 (ir_variable_mode
) var
->data
.mode
,
4110 /* Does the declaration use the deprecated 'attribute' or 'varying'
4113 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
4114 || qual
->flags
.q
.varying
;
4117 /* Validate auxiliary storage qualifiers */
4119 /* From section 4.3.4 of the GLSL 1.30 spec:
4120 * "It is an error to use centroid in in a vertex shader."
4122 * From section 4.3.4 of the GLSL ES 3.00 spec:
4123 * "It is an error to use centroid in or interpolation qualifiers in
4124 * a vertex shader input."
4127 /* Section 4.3.6 of the GLSL 1.30 specification states:
4128 * "It is an error to use centroid out in a fragment shader."
4130 * The GL_ARB_shading_language_420pack extension specification states:
4131 * "It is an error to use auxiliary storage qualifiers or interpolation
4132 * qualifiers on an output in a fragment shader."
4134 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
4135 _mesa_glsl_error(loc
, state
,
4136 "sample qualifier may only be used on `in` or `out` "
4137 "variables between shader stages");
4139 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
4140 _mesa_glsl_error(loc
, state
,
4141 "centroid qualifier may only be used with `in', "
4142 "`out' or `varying' variables between shader stages");
4145 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
4146 _mesa_glsl_error(loc
, state
,
4147 "the shared storage qualifiers can only be used with "
4151 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
4155 * Get the variable that is being redeclared by this declaration or if it
4156 * does not exist, the current declared variable.
4158 * Semantic checks to verify the validity of the redeclaration are also
4159 * performed. If semantic checks fail, compilation error will be emitted via
4160 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
4163 * A pointer to an existing variable in the current scope if the declaration
4164 * is a redeclaration, current variable otherwise. \c is_declared boolean
4165 * will return \c true if the declaration is a redeclaration, \c false
4168 static ir_variable
*
4169 get_variable_being_redeclared(ir_variable
**var_ptr
, YYLTYPE loc
,
4170 struct _mesa_glsl_parse_state
*state
,
4171 bool allow_all_redeclarations
,
4172 bool *is_redeclaration
)
4174 ir_variable
*var
= *var_ptr
;
4176 /* Check if this declaration is actually a re-declaration, either to
4177 * resize an array or add qualifiers to an existing variable.
4179 * This is allowed for variables in the current scope, or when at
4180 * global scope (for built-ins in the implicit outer scope).
4182 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
4183 if (earlier
== NULL
||
4184 (state
->current_function
!= NULL
&&
4185 !state
->symbols
->name_declared_this_scope(var
->name
))) {
4186 *is_redeclaration
= false;
4190 *is_redeclaration
= true;
4192 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4194 * "It is legal to declare an array without a size and then
4195 * later re-declare the same name as an array of the same
4196 * type and specify a size."
4198 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4199 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4200 /* FINISHME: This doesn't match the qualifiers on the two
4201 * FINISHME: declarations. It's not 100% clear whether this is
4202 * FINISHME: required or not.
4205 const int size
= var
->type
->array_size();
4206 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4207 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4208 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4210 earlier
->data
.max_array_access
);
4213 earlier
->type
= var
->type
;
4217 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4218 state
->is_version(150, 0))
4219 && strcmp(var
->name
, "gl_FragCoord") == 0
4220 && earlier
->type
== var
->type
4221 && var
->data
.mode
== ir_var_shader_in
) {
4222 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4225 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
4226 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
4228 /* According to section 4.3.7 of the GLSL 1.30 spec,
4229 * the following built-in varaibles can be redeclared with an
4230 * interpolation qualifier:
4233 * * gl_FrontSecondaryColor
4234 * * gl_BackSecondaryColor
4236 * * gl_SecondaryColor
4238 } else if (state
->is_version(130, 0)
4239 && (strcmp(var
->name
, "gl_FrontColor") == 0
4240 || strcmp(var
->name
, "gl_BackColor") == 0
4241 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4242 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4243 || strcmp(var
->name
, "gl_Color") == 0
4244 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
4245 && earlier
->type
== var
->type
4246 && earlier
->data
.mode
== var
->data
.mode
) {
4247 earlier
->data
.interpolation
= var
->data
.interpolation
;
4249 /* Layout qualifiers for gl_FragDepth. */
4250 } else if ((state
->is_version(420, 0) ||
4251 state
->AMD_conservative_depth_enable
||
4252 state
->ARB_conservative_depth_enable
)
4253 && strcmp(var
->name
, "gl_FragDepth") == 0
4254 && earlier
->type
== var
->type
4255 && earlier
->data
.mode
== var
->data
.mode
) {
4257 /** From the AMD_conservative_depth spec:
4258 * Within any shader, the first redeclarations of gl_FragDepth
4259 * must appear before any use of gl_FragDepth.
4261 if (earlier
->data
.used
) {
4262 _mesa_glsl_error(&loc
, state
,
4263 "the first redeclaration of gl_FragDepth "
4264 "must appear before any use of gl_FragDepth");
4267 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4268 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4269 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4270 _mesa_glsl_error(&loc
, state
,
4271 "gl_FragDepth: depth layout is declared here "
4272 "as '%s, but it was previously declared as "
4274 depth_layout_string(var
->data
.depth_layout
),
4275 depth_layout_string(earlier
->data
.depth_layout
));
4278 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4280 } else if (state
->has_framebuffer_fetch() &&
4281 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4282 var
->type
== earlier
->type
&&
4283 var
->data
.mode
== ir_var_auto
) {
4284 /* According to the EXT_shader_framebuffer_fetch spec:
4286 * "By default, gl_LastFragData is declared with the mediump precision
4287 * qualifier. This can be changed by redeclaring the corresponding
4288 * variables with the desired precision qualifier."
4290 earlier
->data
.precision
= var
->data
.precision
;
4292 } else if (earlier
->data
.how_declared
== ir_var_declared_implicitly
&&
4293 state
->allow_builtin_variable_redeclaration
) {
4294 /* Allow verbatim redeclarations of built-in variables. Not explicitly
4295 * valid, but some applications do it.
4297 if (earlier
->data
.mode
!= var
->data
.mode
&&
4298 !(earlier
->data
.mode
== ir_var_system_value
&&
4299 var
->data
.mode
== ir_var_shader_in
)) {
4300 _mesa_glsl_error(&loc
, state
,
4301 "redeclaration of `%s' with incorrect qualifiers",
4303 } else if (earlier
->type
!= var
->type
) {
4304 _mesa_glsl_error(&loc
, state
,
4305 "redeclaration of `%s' has incorrect type",
4308 } else if (allow_all_redeclarations
) {
4309 if (earlier
->data
.mode
!= var
->data
.mode
) {
4310 _mesa_glsl_error(&loc
, state
,
4311 "redeclaration of `%s' with incorrect qualifiers",
4313 } else if (earlier
->type
!= var
->type
) {
4314 _mesa_glsl_error(&loc
, state
,
4315 "redeclaration of `%s' has incorrect type",
4319 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4326 * Generate the IR for an initializer in a variable declaration
4329 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4330 ast_fully_specified_type
*type
,
4331 exec_list
*initializer_instructions
,
4332 struct _mesa_glsl_parse_state
*state
)
4334 void *mem_ctx
= state
;
4335 ir_rvalue
*result
= NULL
;
4337 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4339 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4341 * "All uniform variables are read-only and are initialized either
4342 * directly by an application via API commands, or indirectly by
4345 if (var
->data
.mode
== ir_var_uniform
) {
4346 state
->check_version(120, 0, &initializer_loc
,
4347 "cannot initialize uniform %s",
4351 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4353 * "Buffer variables cannot have initializers."
4355 if (var
->data
.mode
== ir_var_shader_storage
) {
4356 _mesa_glsl_error(&initializer_loc
, state
,
4357 "cannot initialize buffer variable %s",
4361 /* From section 4.1.7 of the GLSL 4.40 spec:
4363 * "Opaque variables [...] are initialized only through the
4364 * OpenGL API; they cannot be declared with an initializer in a
4367 * From section 4.1.7 of the ARB_bindless_texture spec:
4369 * "Samplers may be declared as shader inputs and outputs, as uniform
4370 * variables, as temporary variables, and as function parameters."
4372 * From section 4.1.X of the ARB_bindless_texture spec:
4374 * "Images may be declared as shader inputs and outputs, as uniform
4375 * variables, as temporary variables, and as function parameters."
4377 if (var
->type
->contains_atomic() ||
4378 (!state
->has_bindless() && var
->type
->contains_opaque())) {
4379 _mesa_glsl_error(&initializer_loc
, state
,
4380 "cannot initialize %s variable %s",
4381 var
->name
, state
->has_bindless() ? "atomic" : "opaque");
4384 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4385 _mesa_glsl_error(&initializer_loc
, state
,
4386 "cannot initialize %s shader input / %s %s",
4387 _mesa_shader_stage_to_string(state
->stage
),
4388 (state
->stage
== MESA_SHADER_VERTEX
)
4389 ? "attribute" : "varying",
4393 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4394 _mesa_glsl_error(&initializer_loc
, state
,
4395 "cannot initialize %s shader output %s",
4396 _mesa_shader_stage_to_string(state
->stage
),
4400 /* If the initializer is an ast_aggregate_initializer, recursively store
4401 * type information from the LHS into it, so that its hir() function can do
4404 if (decl
->initializer
->oper
== ast_aggregate
)
4405 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4407 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4408 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4410 /* Calculate the constant value if this is a const or uniform
4413 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4415 * "Declarations of globals without a storage qualifier, or with
4416 * just the const qualifier, may include initializers, in which case
4417 * they will be initialized before the first line of main() is
4418 * executed. Such initializers must be a constant expression."
4420 * The same section of the GLSL ES 3.00.4 spec has similar language.
4422 if (type
->qualifier
.flags
.q
.constant
4423 || type
->qualifier
.flags
.q
.uniform
4424 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4425 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4427 if (new_rhs
!= NULL
) {
4430 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4433 * "A constant expression is one of
4437 * - an expression formed by an operator on operands that are
4438 * all constant expressions, including getting an element of
4439 * a constant array, or a field of a constant structure, or
4440 * components of a constant vector. However, the sequence
4441 * operator ( , ) and the assignment operators ( =, +=, ...)
4442 * are not included in the operators that can create a
4443 * constant expression."
4445 * Section 12.43 (Sequence operator and constant expressions) says:
4447 * "Should the following construct be allowed?
4451 * The expression within the brackets uses the sequence operator
4452 * (',') and returns the integer 3 so the construct is declaring
4453 * a single-dimensional array of size 3. In some languages, the
4454 * construct declares a two-dimensional array. It would be
4455 * preferable to make this construct illegal to avoid confusion.
4457 * One possibility is to change the definition of the sequence
4458 * operator so that it does not return a constant-expression and
4459 * hence cannot be used to declare an array size.
4461 * RESOLUTION: The result of a sequence operator is not a
4462 * constant-expression."
4464 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4465 * contains language almost identical to the section 4.3.3 in the
4466 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4469 ir_constant
*constant_value
=
4470 rhs
->constant_expression_value(mem_ctx
);
4472 if (!constant_value
||
4473 (state
->is_version(430, 300) &&
4474 decl
->initializer
->has_sequence_subexpression())) {
4475 const char *const variable_mode
=
4476 (type
->qualifier
.flags
.q
.constant
)
4478 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4480 /* If ARB_shading_language_420pack is enabled, initializers of
4481 * const-qualified local variables do not have to be constant
4482 * expressions. Const-qualified global variables must still be
4483 * initialized with constant expressions.
4485 if (!state
->has_420pack()
4486 || state
->current_function
== NULL
) {
4487 _mesa_glsl_error(& initializer_loc
, state
,
4488 "initializer of %s variable `%s' must be a "
4489 "constant expression",
4492 if (var
->type
->is_numeric()) {
4493 /* Reduce cascading errors. */
4494 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4495 ? ir_constant::zero(state
, var
->type
) : NULL
;
4499 rhs
= constant_value
;
4500 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4501 ? constant_value
: NULL
;
4504 if (var
->type
->is_numeric()) {
4505 /* Reduce cascading errors. */
4506 rhs
= var
->constant_value
= type
->qualifier
.flags
.q
.constant
4507 ? ir_constant::zero(state
, var
->type
) : NULL
;
4512 if (rhs
&& !rhs
->type
->is_error()) {
4513 bool temp
= var
->data
.read_only
;
4514 if (type
->qualifier
.flags
.q
.constant
)
4515 var
->data
.read_only
= false;
4517 /* Never emit code to initialize a uniform.
4519 const glsl_type
*initializer_type
;
4520 if (!type
->qualifier
.flags
.q
.uniform
) {
4521 do_assignment(initializer_instructions
, state
,
4526 type
->get_location());
4527 initializer_type
= result
->type
;
4529 initializer_type
= rhs
->type
;
4531 var
->constant_initializer
= rhs
->constant_expression_value(mem_ctx
);
4532 var
->data
.has_initializer
= true;
4534 /* If the declared variable is an unsized array, it must inherrit
4535 * its full type from the initializer. A declaration such as
4537 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4541 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4543 * The assignment generated in the if-statement (below) will also
4544 * automatically handle this case for non-uniforms.
4546 * If the declared variable is not an array, the types must
4547 * already match exactly. As a result, the type assignment
4548 * here can be done unconditionally. For non-uniforms the call
4549 * to do_assignment can change the type of the initializer (via
4550 * the implicit conversion rules). For uniforms the initializer
4551 * must be a constant expression, and the type of that expression
4552 * was validated above.
4554 var
->type
= initializer_type
;
4556 var
->data
.read_only
= temp
;
4563 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4564 YYLTYPE loc
, ir_variable
*var
,
4565 unsigned num_vertices
,
4567 const char *var_category
)
4569 if (var
->type
->is_unsized_array()) {
4570 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4572 * All geometry shader input unsized array declarations will be
4573 * sized by an earlier input layout qualifier, when present, as per
4574 * the following table.
4576 * Followed by a table mapping each allowed input layout qualifier to
4577 * the corresponding input length.
4579 * Similarly for tessellation control shader outputs.
4581 if (num_vertices
!= 0)
4582 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4585 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4586 * includes the following examples of compile-time errors:
4588 * // code sequence within one shader...
4589 * in vec4 Color1[]; // size unknown
4590 * ...Color1.length()...// illegal, length() unknown
4591 * in vec4 Color2[2]; // size is 2
4592 * ...Color1.length()...// illegal, Color1 still has no size
4593 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4594 * layout(lines) in; // legal, input size is 2, matching
4595 * in vec4 Color4[3]; // illegal, contradicts layout
4598 * To detect the case illustrated by Color3, we verify that the size of
4599 * an explicitly-sized array matches the size of any previously declared
4600 * explicitly-sized array. To detect the case illustrated by Color4, we
4601 * verify that the size of an explicitly-sized array is consistent with
4602 * any previously declared input layout.
4604 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4605 _mesa_glsl_error(&loc
, state
,
4606 "%s size contradicts previously declared layout "
4607 "(size is %u, but layout requires a size of %u)",
4608 var_category
, var
->type
->length
, num_vertices
);
4609 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4610 _mesa_glsl_error(&loc
, state
,
4611 "%s sizes are inconsistent (size is %u, but a "
4612 "previous declaration has size %u)",
4613 var_category
, var
->type
->length
, *size
);
4615 *size
= var
->type
->length
;
4621 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4622 YYLTYPE loc
, ir_variable
*var
)
4624 unsigned num_vertices
= 0;
4626 if (state
->tcs_output_vertices_specified
) {
4627 if (!state
->out_qualifier
->vertices
->
4628 process_qualifier_constant(state
, "vertices",
4629 &num_vertices
, false)) {
4633 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4634 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4635 "GL_MAX_PATCH_VERTICES", num_vertices
);
4640 if (!var
->type
->is_array() && !var
->data
.patch
) {
4641 _mesa_glsl_error(&loc
, state
,
4642 "tessellation control shader outputs must be arrays");
4644 /* To avoid cascading failures, short circuit the checks below. */
4648 if (var
->data
.patch
)
4651 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4652 &state
->tcs_output_size
,
4653 "tessellation control shader output");
4657 * Do additional processing necessary for tessellation control/evaluation shader
4658 * input declarations. This covers both interface block arrays and bare input
4662 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4663 YYLTYPE loc
, ir_variable
*var
)
4665 if (!var
->type
->is_array() && !var
->data
.patch
) {
4666 _mesa_glsl_error(&loc
, state
,
4667 "per-vertex tessellation shader inputs must be arrays");
4668 /* Avoid cascading failures. */
4672 if (var
->data
.patch
)
4675 /* The ARB_tessellation_shader spec says:
4677 * "Declaring an array size is optional. If no size is specified, it
4678 * will be taken from the implementation-dependent maximum patch size
4679 * (gl_MaxPatchVertices). If a size is specified, it must match the
4680 * maximum patch size; otherwise, a compile or link error will occur."
4682 * This text appears twice, once for TCS inputs, and again for TES inputs.
4684 if (var
->type
->is_unsized_array()) {
4685 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4686 state
->Const
.MaxPatchVertices
);
4687 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4688 _mesa_glsl_error(&loc
, state
,
4689 "per-vertex tessellation shader input arrays must be "
4690 "sized to gl_MaxPatchVertices (%d).",
4691 state
->Const
.MaxPatchVertices
);
4697 * Do additional processing necessary for geometry shader input declarations
4698 * (this covers both interface blocks arrays and bare input variables).
4701 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4702 YYLTYPE loc
, ir_variable
*var
)
4704 unsigned num_vertices
= 0;
4706 if (state
->gs_input_prim_type_specified
) {
4707 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4710 /* Geometry shader input variables must be arrays. Caller should have
4711 * reported an error for this.
4713 if (!var
->type
->is_array()) {
4714 assert(state
->error
);
4716 /* To avoid cascading failures, short circuit the checks below. */
4720 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4721 &state
->gs_input_size
,
4722 "geometry shader input");
4726 validate_identifier(const char *identifier
, YYLTYPE loc
,
4727 struct _mesa_glsl_parse_state
*state
)
4729 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4731 * "Identifiers starting with "gl_" are reserved for use by
4732 * OpenGL, and may not be declared in a shader as either a
4733 * variable or a function."
4735 if (is_gl_identifier(identifier
)) {
4736 _mesa_glsl_error(&loc
, state
,
4737 "identifier `%s' uses reserved `gl_' prefix",
4739 } else if (strstr(identifier
, "__")) {
4740 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4743 * "In addition, all identifiers containing two
4744 * consecutive underscores (__) are reserved as
4745 * possible future keywords."
4747 * The intention is that names containing __ are reserved for internal
4748 * use by the implementation, and names prefixed with GL_ are reserved
4749 * for use by Khronos. Names simply containing __ are dangerous to use,
4750 * but should be allowed.
4752 * A future version of the GLSL specification will clarify this.
4754 _mesa_glsl_warning(&loc
, state
,
4755 "identifier `%s' uses reserved `__' string",
4761 ast_declarator_list::hir(exec_list
*instructions
,
4762 struct _mesa_glsl_parse_state
*state
)
4765 const struct glsl_type
*decl_type
;
4766 const char *type_name
= NULL
;
4767 ir_rvalue
*result
= NULL
;
4768 YYLTYPE loc
= this->get_location();
4770 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4772 * "To ensure that a particular output variable is invariant, it is
4773 * necessary to use the invariant qualifier. It can either be used to
4774 * qualify a previously declared variable as being invariant
4776 * invariant gl_Position; // make existing gl_Position be invariant"
4778 * In these cases the parser will set the 'invariant' flag in the declarator
4779 * list, and the type will be NULL.
4781 if (this->invariant
) {
4782 assert(this->type
== NULL
);
4784 if (state
->current_function
!= NULL
) {
4785 _mesa_glsl_error(& loc
, state
,
4786 "all uses of `invariant' keyword must be at global "
4790 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4791 assert(decl
->array_specifier
== NULL
);
4792 assert(decl
->initializer
== NULL
);
4794 ir_variable
*const earlier
=
4795 state
->symbols
->get_variable(decl
->identifier
);
4796 if (earlier
== NULL
) {
4797 _mesa_glsl_error(& loc
, state
,
4798 "undeclared variable `%s' cannot be marked "
4799 "invariant", decl
->identifier
);
4800 } else if (!is_allowed_invariant(earlier
, state
)) {
4801 _mesa_glsl_error(&loc
, state
,
4802 "`%s' cannot be marked invariant; interfaces between "
4803 "shader stages only.", decl
->identifier
);
4804 } else if (earlier
->data
.used
) {
4805 _mesa_glsl_error(& loc
, state
,
4806 "variable `%s' may not be redeclared "
4807 "`invariant' after being used",
4810 earlier
->data
.invariant
= true;
4814 /* Invariant redeclarations do not have r-values.
4819 if (this->precise
) {
4820 assert(this->type
== NULL
);
4822 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4823 assert(decl
->array_specifier
== NULL
);
4824 assert(decl
->initializer
== NULL
);
4826 ir_variable
*const earlier
=
4827 state
->symbols
->get_variable(decl
->identifier
);
4828 if (earlier
== NULL
) {
4829 _mesa_glsl_error(& loc
, state
,
4830 "undeclared variable `%s' cannot be marked "
4831 "precise", decl
->identifier
);
4832 } else if (state
->current_function
!= NULL
&&
4833 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4834 /* Note: we have to check if we're in a function, since
4835 * builtins are treated as having come from another scope.
4837 _mesa_glsl_error(& loc
, state
,
4838 "variable `%s' from an outer scope may not be "
4839 "redeclared `precise' in this scope",
4841 } else if (earlier
->data
.used
) {
4842 _mesa_glsl_error(& loc
, state
,
4843 "variable `%s' may not be redeclared "
4844 "`precise' after being used",
4847 earlier
->data
.precise
= true;
4851 /* Precise redeclarations do not have r-values either. */
4855 assert(this->type
!= NULL
);
4856 assert(!this->invariant
);
4857 assert(!this->precise
);
4859 /* The type specifier may contain a structure definition. Process that
4860 * before any of the variable declarations.
4862 (void) this->type
->specifier
->hir(instructions
, state
);
4864 decl_type
= this->type
->glsl_type(& type_name
, state
);
4866 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4867 * "Buffer variables may only be declared inside interface blocks
4868 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4869 * shader storage blocks. It is a compile-time error to declare buffer
4870 * variables at global scope (outside a block)."
4872 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4873 _mesa_glsl_error(&loc
, state
,
4874 "buffer variables cannot be declared outside "
4875 "interface blocks");
4878 /* An offset-qualified atomic counter declaration sets the default
4879 * offset for the next declaration within the same atomic counter
4882 if (decl_type
&& decl_type
->contains_atomic()) {
4883 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4884 type
->qualifier
.flags
.q
.explicit_offset
) {
4885 unsigned qual_binding
;
4886 unsigned qual_offset
;
4887 if (process_qualifier_constant(state
, &loc
, "binding",
4888 type
->qualifier
.binding
,
4890 && process_qualifier_constant(state
, &loc
, "offset",
4891 type
->qualifier
.offset
,
4893 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4897 ast_type_qualifier allowed_atomic_qual_mask
;
4898 allowed_atomic_qual_mask
.flags
.i
= 0;
4899 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4900 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4901 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4903 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4904 "invalid layout qualifier for",
4908 if (this->declarations
.is_empty()) {
4909 /* If there is no structure involved in the program text, there are two
4910 * possible scenarios:
4912 * - The program text contained something like 'vec4;'. This is an
4913 * empty declaration. It is valid but weird. Emit a warning.
4915 * - The program text contained something like 'S;' and 'S' is not the
4916 * name of a known structure type. This is both invalid and weird.
4919 * - The program text contained something like 'mediump float;'
4920 * when the programmer probably meant 'precision mediump
4921 * float;' Emit a warning with a description of what they
4922 * probably meant to do.
4924 * Note that if decl_type is NULL and there is a structure involved,
4925 * there must have been some sort of error with the structure. In this
4926 * case we assume that an error was already generated on this line of
4927 * code for the structure. There is no need to generate an additional,
4930 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4933 if (decl_type
== NULL
) {
4934 _mesa_glsl_error(&loc
, state
,
4935 "invalid type `%s' in empty declaration",
4938 if (decl_type
->is_array()) {
4939 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4942 * "... any declaration that leaves the size undefined is
4943 * disallowed as this would add complexity and there are no
4946 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4947 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4948 "or implicitly defined");
4951 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4953 * "The combinations of types and qualifiers that cause
4954 * compile-time or link-time errors are the same whether or not
4955 * the declaration is empty."
4957 validate_array_dimensions(decl_type
, state
, &loc
);
4960 if (decl_type
->is_atomic_uint()) {
4961 /* Empty atomic counter declarations are allowed and useful
4962 * to set the default offset qualifier.
4965 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4966 if (this->type
->specifier
->structure
!= NULL
) {
4967 _mesa_glsl_error(&loc
, state
,
4968 "precision qualifiers can't be applied "
4971 static const char *const precision_names
[] = {
4978 _mesa_glsl_warning(&loc
, state
,
4979 "empty declaration with precision "
4980 "qualifier, to set the default precision, "
4981 "use `precision %s %s;'",
4982 precision_names
[this->type
->
4983 qualifier
.precision
],
4986 } else if (this->type
->specifier
->structure
== NULL
) {
4987 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4992 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4993 const struct glsl_type
*var_type
;
4995 const char *identifier
= decl
->identifier
;
4996 /* FINISHME: Emit a warning if a variable declaration shadows a
4997 * FINISHME: declaration at a higher scope.
5000 if ((decl_type
== NULL
) || decl_type
->is_void()) {
5001 if (type_name
!= NULL
) {
5002 _mesa_glsl_error(& loc
, state
,
5003 "invalid type `%s' in declaration of `%s'",
5004 type_name
, decl
->identifier
);
5006 _mesa_glsl_error(& loc
, state
,
5007 "invalid type in declaration of `%s'",
5013 if (this->type
->qualifier
.is_subroutine_decl()) {
5017 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
5019 _mesa_glsl_error(& loc
, state
,
5020 "invalid type in declaration of `%s'",
5022 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
5027 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
5030 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
5032 /* The 'varying in' and 'varying out' qualifiers can only be used with
5033 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
5036 if (this->type
->qualifier
.flags
.q
.varying
) {
5037 if (this->type
->qualifier
.flags
.q
.in
) {
5038 _mesa_glsl_error(& loc
, state
,
5039 "`varying in' qualifier in declaration of "
5040 "`%s' only valid for geometry shaders using "
5041 "ARB_geometry_shader4 or EXT_geometry_shader4",
5043 } else if (this->type
->qualifier
.flags
.q
.out
) {
5044 _mesa_glsl_error(& loc
, state
,
5045 "`varying out' qualifier in declaration of "
5046 "`%s' only valid for geometry shaders using "
5047 "ARB_geometry_shader4 or EXT_geometry_shader4",
5052 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
5054 * "Global variables can only use the qualifiers const,
5055 * attribute, uniform, or varying. Only one may be
5058 * Local variables can only use the qualifier const."
5060 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
5061 * any extension that adds the 'layout' keyword.
5063 if (!state
->is_version(130, 300)
5064 && !state
->has_explicit_attrib_location()
5065 && !state
->has_separate_shader_objects()
5066 && !state
->ARB_fragment_coord_conventions_enable
) {
5067 if (this->type
->qualifier
.flags
.q
.out
) {
5068 _mesa_glsl_error(& loc
, state
,
5069 "`out' qualifier in declaration of `%s' "
5070 "only valid for function parameters in %s",
5071 decl
->identifier
, state
->get_version_string());
5073 if (this->type
->qualifier
.flags
.q
.in
) {
5074 _mesa_glsl_error(& loc
, state
,
5075 "`in' qualifier in declaration of `%s' "
5076 "only valid for function parameters in %s",
5077 decl
->identifier
, state
->get_version_string());
5079 /* FINISHME: Test for other invalid qualifiers. */
5082 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
5084 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
5087 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
5088 && (var
->type
->is_numeric() || var
->type
->is_boolean())
5089 && state
->zero_init
) {
5090 const ir_constant_data data
= { { 0 } };
5091 var
->data
.has_initializer
= true;
5092 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
5095 if (this->type
->qualifier
.flags
.q
.invariant
) {
5096 if (!is_allowed_invariant(var
, state
)) {
5097 _mesa_glsl_error(&loc
, state
,
5098 "`%s' cannot be marked invariant; interfaces between "
5099 "shader stages only", var
->name
);
5103 if (state
->current_function
!= NULL
) {
5104 const char *mode
= NULL
;
5105 const char *extra
= "";
5107 /* There is no need to check for 'inout' here because the parser will
5108 * only allow that in function parameter lists.
5110 if (this->type
->qualifier
.flags
.q
.attribute
) {
5112 } else if (this->type
->qualifier
.is_subroutine_decl()) {
5113 mode
= "subroutine uniform";
5114 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
5116 } else if (this->type
->qualifier
.flags
.q
.varying
) {
5118 } else if (this->type
->qualifier
.flags
.q
.in
) {
5120 extra
= " or in function parameter list";
5121 } else if (this->type
->qualifier
.flags
.q
.out
) {
5123 extra
= " or in function parameter list";
5127 _mesa_glsl_error(& loc
, state
,
5128 "%s variable `%s' must be declared at "
5130 mode
, var
->name
, extra
);
5132 } else if (var
->data
.mode
== ir_var_shader_in
) {
5133 var
->data
.read_only
= true;
5135 if (state
->stage
== MESA_SHADER_VERTEX
) {
5136 bool error_emitted
= false;
5138 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
5140 * "Vertex shader inputs can only be float, floating-point
5141 * vectors, matrices, signed and unsigned integers and integer
5142 * vectors. Vertex shader inputs can also form arrays of these
5143 * types, but not structures."
5145 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
5147 * "Vertex shader inputs can only be float, floating-point
5148 * vectors, matrices, signed and unsigned integers and integer
5149 * vectors. They cannot be arrays or structures."
5151 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
5153 * "The attribute qualifier can be used only with float,
5154 * floating-point vectors, and matrices. Attribute variables
5155 * cannot be declared as arrays or structures."
5157 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
5159 * "Vertex shader inputs can only be float, floating-point
5160 * vectors, matrices, signed and unsigned integers and integer
5161 * vectors. Vertex shader inputs cannot be arrays or
5164 * From section 4.3.4 of the ARB_bindless_texture spec:
5166 * "(modify third paragraph of the section to allow sampler and
5167 * image types) ... Vertex shader inputs can only be float,
5168 * single-precision floating-point scalars, single-precision
5169 * floating-point vectors, matrices, signed and unsigned
5170 * integers and integer vectors, sampler and image types."
5172 const glsl_type
*check_type
= var
->type
->without_array();
5174 switch (check_type
->base_type
) {
5175 case GLSL_TYPE_FLOAT
:
5177 case GLSL_TYPE_UINT64
:
5178 case GLSL_TYPE_INT64
:
5180 case GLSL_TYPE_UINT
:
5182 if (state
->is_version(120, 300))
5184 case GLSL_TYPE_DOUBLE
:
5185 if (check_type
->is_double() && (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
5187 case GLSL_TYPE_SAMPLER
:
5188 if (check_type
->is_sampler() && state
->has_bindless())
5190 case GLSL_TYPE_IMAGE
:
5191 if (check_type
->is_image() && state
->has_bindless())
5195 _mesa_glsl_error(& loc
, state
,
5196 "vertex shader input / attribute cannot have "
5198 var
->type
->is_array() ? "array of " : "",
5200 error_emitted
= true;
5203 if (!error_emitted
&& var
->type
->is_array() &&
5204 !state
->check_version(150, 0, &loc
,
5205 "vertex shader input / attribute "
5206 "cannot have array type")) {
5207 error_emitted
= true;
5209 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
5210 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5212 * Geometry shader input variables get the per-vertex values
5213 * written out by vertex shader output variables of the same
5214 * names. Since a geometry shader operates on a set of
5215 * vertices, each input varying variable (or input block, see
5216 * interface blocks below) needs to be declared as an array.
5218 if (!var
->type
->is_array()) {
5219 _mesa_glsl_error(&loc
, state
,
5220 "geometry shader inputs must be arrays");
5223 handle_geometry_shader_input_decl(state
, loc
, var
);
5224 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5225 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5227 * It is a compile-time error to declare a fragment shader
5228 * input with, or that contains, any of the following types:
5232 * * An array of arrays
5233 * * An array of structures
5234 * * A structure containing an array
5235 * * A structure containing a structure
5237 if (state
->es_shader
) {
5238 const glsl_type
*check_type
= var
->type
->without_array();
5239 if (check_type
->is_boolean() ||
5240 check_type
->contains_opaque()) {
5241 _mesa_glsl_error(&loc
, state
,
5242 "fragment shader input cannot have type %s",
5245 if (var
->type
->is_array() &&
5246 var
->type
->fields
.array
->is_array()) {
5247 _mesa_glsl_error(&loc
, state
,
5249 "cannot have an array of arrays",
5250 _mesa_shader_stage_to_string(state
->stage
));
5252 if (var
->type
->is_array() &&
5253 var
->type
->fields
.array
->is_record()) {
5254 _mesa_glsl_error(&loc
, state
,
5255 "fragment shader input "
5256 "cannot have an array of structs");
5258 if (var
->type
->is_record()) {
5259 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5260 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5261 var
->type
->fields
.structure
[i
].type
->is_record())
5262 _mesa_glsl_error(&loc
, state
,
5263 "fragement shader input cannot have "
5264 "a struct that contains an "
5269 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5270 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5271 handle_tess_shader_input_decl(state
, loc
, var
);
5273 } else if (var
->data
.mode
== ir_var_shader_out
) {
5274 const glsl_type
*check_type
= var
->type
->without_array();
5276 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5278 * It is a compile-time error to declare a fragment shader output
5279 * that contains any of the following:
5281 * * A Boolean type (bool, bvec2 ...)
5282 * * A double-precision scalar or vector (double, dvec2 ...)
5287 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5288 if (check_type
->is_record() || check_type
->is_matrix())
5289 _mesa_glsl_error(&loc
, state
,
5290 "fragment shader output "
5291 "cannot have struct or matrix type");
5292 switch (check_type
->base_type
) {
5293 case GLSL_TYPE_UINT
:
5295 case GLSL_TYPE_FLOAT
:
5298 _mesa_glsl_error(&loc
, state
,
5299 "fragment shader output cannot have "
5300 "type %s", check_type
->name
);
5304 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5306 * It is a compile-time error to declare a vertex shader output
5307 * with, or that contains, any of the following types:
5311 * * An array of arrays
5312 * * An array of structures
5313 * * A structure containing an array
5314 * * A structure containing a structure
5316 * It is a compile-time error to declare a fragment shader output
5317 * with, or that contains, any of the following types:
5323 * * An array of array
5325 * ES 3.20 updates this to apply to tessellation and geometry shaders
5326 * as well. Because there are per-vertex arrays in the new stages,
5327 * it strikes the "array of..." rules and replaces them with these:
5329 * * For per-vertex-arrayed variables (applies to tessellation
5330 * control, tessellation evaluation and geometry shaders):
5332 * * Per-vertex-arrayed arrays of arrays
5333 * * Per-vertex-arrayed arrays of structures
5335 * * For non-per-vertex-arrayed variables:
5337 * * An array of arrays
5338 * * An array of structures
5340 * which basically says to unwrap the per-vertex aspect and apply
5343 if (state
->es_shader
) {
5344 if (var
->type
->is_array() &&
5345 var
->type
->fields
.array
->is_array()) {
5346 _mesa_glsl_error(&loc
, state
,
5348 "cannot have an array of arrays",
5349 _mesa_shader_stage_to_string(state
->stage
));
5351 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5352 const glsl_type
*type
= var
->type
;
5354 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5355 !var
->data
.patch
&& var
->type
->is_array()) {
5356 type
= var
->type
->fields
.array
;
5359 if (type
->is_array() && type
->fields
.array
->is_record()) {
5360 _mesa_glsl_error(&loc
, state
,
5361 "%s shader output cannot have "
5362 "an array of structs",
5363 _mesa_shader_stage_to_string(state
->stage
));
5365 if (type
->is_record()) {
5366 for (unsigned i
= 0; i
< type
->length
; i
++) {
5367 if (type
->fields
.structure
[i
].type
->is_array() ||
5368 type
->fields
.structure
[i
].type
->is_record())
5369 _mesa_glsl_error(&loc
, state
,
5370 "%s shader output cannot have a "
5371 "struct that contains an "
5373 _mesa_shader_stage_to_string(state
->stage
));
5379 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5380 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5382 } else if (var
->type
->contains_subroutine()) {
5383 /* declare subroutine uniforms as hidden */
5384 var
->data
.how_declared
= ir_var_hidden
;
5387 /* From section 4.3.4 of the GLSL 4.00 spec:
5388 * "Input variables may not be declared using the patch in qualifier
5389 * in tessellation control or geometry shaders."
5391 * From section 4.3.6 of the GLSL 4.00 spec:
5392 * "It is an error to use patch out in a vertex, tessellation
5393 * evaluation, or geometry shader."
5395 * This doesn't explicitly forbid using them in a fragment shader, but
5396 * that's probably just an oversight.
5398 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5399 && this->type
->qualifier
.flags
.q
.patch
5400 && this->type
->qualifier
.flags
.q
.in
) {
5402 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5403 "tessellation evaluation shader");
5406 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5407 && this->type
->qualifier
.flags
.q
.patch
5408 && this->type
->qualifier
.flags
.q
.out
) {
5410 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5411 "tessellation control shader");
5414 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5416 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5417 state
->check_precision_qualifiers_allowed(&loc
);
5420 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5421 !precision_qualifier_allowed(var
->type
)) {
5422 _mesa_glsl_error(&loc
, state
,
5423 "precision qualifiers apply only to floating point"
5424 ", integer and opaque types");
5427 /* From section 4.1.7 of the GLSL 4.40 spec:
5429 * "[Opaque types] can only be declared as function
5430 * parameters or uniform-qualified variables."
5432 * From section 4.1.7 of the ARB_bindless_texture spec:
5434 * "Samplers may be declared as shader inputs and outputs, as uniform
5435 * variables, as temporary variables, and as function parameters."
5437 * From section 4.1.X of the ARB_bindless_texture spec:
5439 * "Images may be declared as shader inputs and outputs, as uniform
5440 * variables, as temporary variables, and as function parameters."
5442 if (!this->type
->qualifier
.flags
.q
.uniform
&&
5443 (var_type
->contains_atomic() ||
5444 (!state
->has_bindless() && var_type
->contains_opaque()))) {
5445 _mesa_glsl_error(&loc
, state
,
5446 "%s variables must be declared uniform",
5447 state
->has_bindless() ? "atomic" : "opaque");
5450 /* Process the initializer and add its instructions to a temporary
5451 * list. This list will be added to the instruction stream (below) after
5452 * the declaration is added. This is done because in some cases (such as
5453 * redeclarations) the declaration may not actually be added to the
5454 * instruction stream.
5456 exec_list initializer_instructions
;
5458 /* Examine var name here since var may get deleted in the next call */
5459 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5461 bool is_redeclaration
;
5462 ir_variable
*declared_var
=
5463 get_variable_being_redeclared(&var
, decl
->get_location(), state
,
5464 false /* allow_all_redeclarations */,
5466 if (is_redeclaration
) {
5468 declared_var
->data
.how_declared
== ir_var_declared_in_block
) {
5469 _mesa_glsl_error(&loc
, state
,
5470 "`%s' has already been redeclared using "
5471 "gl_PerVertex", declared_var
->name
);
5473 declared_var
->data
.how_declared
= ir_var_declared_normally
;
5476 if (decl
->initializer
!= NULL
) {
5477 result
= process_initializer(declared_var
,
5479 &initializer_instructions
, state
);
5481 validate_array_dimensions(var_type
, state
, &loc
);
5484 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5486 * "It is an error to write to a const variable outside of
5487 * its declaration, so they must be initialized when
5490 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5491 _mesa_glsl_error(& loc
, state
,
5492 "const declaration of `%s' must be initialized",
5496 if (state
->es_shader
) {
5497 const glsl_type
*const t
= declared_var
->type
;
5499 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5501 * The GL_OES_tessellation_shader spec says about inputs:
5503 * "Declaring an array size is optional. If no size is specified,
5504 * it will be taken from the implementation-dependent maximum
5505 * patch size (gl_MaxPatchVertices)."
5507 * and about TCS outputs:
5509 * "If no size is specified, it will be taken from output patch
5510 * size declared in the shader."
5512 * The GL_OES_geometry_shader spec says:
5514 * "All geometry shader input unsized array declarations will be
5515 * sized by an earlier input primitive layout qualifier, when
5516 * present, as per the following table."
5518 const bool implicitly_sized
=
5519 (declared_var
->data
.mode
== ir_var_shader_in
&&
5520 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5521 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5522 (declared_var
->data
.mode
== ir_var_shader_out
&&
5523 state
->stage
== MESA_SHADER_TESS_CTRL
);
5525 if (t
->is_unsized_array() && !implicitly_sized
)
5526 /* Section 10.17 of the GLSL ES 1.00 specification states that
5527 * unsized array declarations have been removed from the language.
5528 * Arrays that are sized using an initializer are still explicitly
5529 * sized. However, GLSL ES 1.00 does not allow array
5530 * initializers. That is only allowed in GLSL ES 3.00.
5532 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5534 * "An array type can also be formed without specifying a size
5535 * if the definition includes an initializer:
5537 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5538 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5543 _mesa_glsl_error(& loc
, state
,
5544 "unsized array declarations are not allowed in "
5548 /* Section 4.4.6.1 Atomic Counter Layout Qualifiers of the GLSL 4.60 spec:
5550 * "It is a compile-time error to declare an unsized array of
5553 if (declared_var
->type
->is_unsized_array() &&
5554 declared_var
->type
->without_array()->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
5555 _mesa_glsl_error(& loc
, state
,
5556 "Unsized array of atomic_uint is not allowed");
5559 /* If the declaration is not a redeclaration, there are a few additional
5560 * semantic checks that must be applied. In addition, variable that was
5561 * created for the declaration should be added to the IR stream.
5563 if (!is_redeclaration
) {
5564 validate_identifier(decl
->identifier
, loc
, state
);
5566 /* Add the variable to the symbol table. Note that the initializer's
5567 * IR was already processed earlier (though it hasn't been emitted
5568 * yet), without the variable in scope.
5570 * This differs from most C-like languages, but it follows the GLSL
5571 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5574 * "Within a declaration, the scope of a name starts immediately
5575 * after the initializer if present or immediately after the name
5576 * being declared if not."
5578 if (!state
->symbols
->add_variable(declared_var
)) {
5579 YYLTYPE loc
= this->get_location();
5580 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5581 "current scope", decl
->identifier
);
5585 /* Push the variable declaration to the top. It means that all the
5586 * variable declarations will appear in a funny last-to-first order,
5587 * but otherwise we run into trouble if a function is prototyped, a
5588 * global var is decled, then the function is defined with usage of
5589 * the global var. See glslparsertest's CorrectModule.frag.
5591 instructions
->push_head(declared_var
);
5594 instructions
->append_list(&initializer_instructions
);
5598 /* Generally, variable declarations do not have r-values. However,
5599 * one is used for the declaration in
5601 * while (bool b = some_condition()) {
5605 * so we return the rvalue from the last seen declaration here.
5612 ast_parameter_declarator::hir(exec_list
*instructions
,
5613 struct _mesa_glsl_parse_state
*state
)
5616 const struct glsl_type
*type
;
5617 const char *name
= NULL
;
5618 YYLTYPE loc
= this->get_location();
5620 type
= this->type
->glsl_type(& name
, state
);
5624 _mesa_glsl_error(& loc
, state
,
5625 "invalid type `%s' in declaration of `%s'",
5626 name
, this->identifier
);
5628 _mesa_glsl_error(& loc
, state
,
5629 "invalid type in declaration of `%s'",
5633 type
= glsl_type::error_type
;
5636 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5638 * "Functions that accept no input arguments need not use void in the
5639 * argument list because prototypes (or definitions) are required and
5640 * therefore there is no ambiguity when an empty argument list "( )" is
5641 * declared. The idiom "(void)" as a parameter list is provided for
5644 * Placing this check here prevents a void parameter being set up
5645 * for a function, which avoids tripping up checks for main taking
5646 * parameters and lookups of an unnamed symbol.
5648 if (type
->is_void()) {
5649 if (this->identifier
!= NULL
)
5650 _mesa_glsl_error(& loc
, state
,
5651 "named parameter cannot have type `void'");
5657 if (formal_parameter
&& (this->identifier
== NULL
)) {
5658 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5662 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5663 * call already handled the "vec4[..] foo" case.
5665 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5667 if (!type
->is_error() && type
->is_unsized_array()) {
5668 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5670 type
= glsl_type::error_type
;
5674 ir_variable
*var
= new(ctx
)
5675 ir_variable(type
, this->identifier
, ir_var_function_in
);
5677 /* Apply any specified qualifiers to the parameter declaration. Note that
5678 * for function parameters the default mode is 'in'.
5680 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5683 /* From section 4.1.7 of the GLSL 4.40 spec:
5685 * "Opaque variables cannot be treated as l-values; hence cannot
5686 * be used as out or inout function parameters, nor can they be
5689 * From section 4.1.7 of the ARB_bindless_texture spec:
5691 * "Samplers can be used as l-values, so can be assigned into and used
5692 * as "out" and "inout" function parameters."
5694 * From section 4.1.X of the ARB_bindless_texture spec:
5696 * "Images can be used as l-values, so can be assigned into and used as
5697 * "out" and "inout" function parameters."
5699 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5700 && (type
->contains_atomic() ||
5701 (!state
->has_bindless() && type
->contains_opaque()))) {
5702 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5703 "contain %s variables",
5704 state
->has_bindless() ? "atomic" : "opaque");
5705 type
= glsl_type::error_type
;
5708 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5710 * "When calling a function, expressions that do not evaluate to
5711 * l-values cannot be passed to parameters declared as out or inout."
5713 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5715 * "Other binary or unary expressions, non-dereferenced arrays,
5716 * function names, swizzles with repeated fields, and constants
5717 * cannot be l-values."
5719 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5720 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5722 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5724 && !state
->check_version(120, 100, &loc
,
5725 "arrays cannot be out or inout parameters")) {
5726 type
= glsl_type::error_type
;
5729 instructions
->push_tail(var
);
5731 /* Parameter declarations do not have r-values.
5738 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5740 exec_list
*ir_parameters
,
5741 _mesa_glsl_parse_state
*state
)
5743 ast_parameter_declarator
*void_param
= NULL
;
5746 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5747 param
->formal_parameter
= formal
;
5748 param
->hir(ir_parameters
, state
);
5756 if ((void_param
!= NULL
) && (count
> 1)) {
5757 YYLTYPE loc
= void_param
->get_location();
5759 _mesa_glsl_error(& loc
, state
,
5760 "`void' parameter must be only parameter");
5766 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5768 /* IR invariants disallow function declarations or definitions
5769 * nested within other function definitions. But there is no
5770 * requirement about the relative order of function declarations
5771 * and definitions with respect to one another. So simply insert
5772 * the new ir_function block at the end of the toplevel instruction
5775 state
->toplevel_ir
->push_tail(f
);
5780 ast_function::hir(exec_list
*instructions
,
5781 struct _mesa_glsl_parse_state
*state
)
5784 ir_function
*f
= NULL
;
5785 ir_function_signature
*sig
= NULL
;
5786 exec_list hir_parameters
;
5787 YYLTYPE loc
= this->get_location();
5789 const char *const name
= identifier
;
5791 /* New functions are always added to the top-level IR instruction stream,
5792 * so this instruction list pointer is ignored. See also emit_function
5795 (void) instructions
;
5797 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5799 * "Function declarations (prototypes) cannot occur inside of functions;
5800 * they must be at global scope, or for the built-in functions, outside
5801 * the global scope."
5803 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5805 * "User defined functions may only be defined within the global scope."
5807 * Note that this language does not appear in GLSL 1.10.
5809 if ((state
->current_function
!= NULL
) &&
5810 state
->is_version(120, 100)) {
5811 YYLTYPE loc
= this->get_location();
5812 _mesa_glsl_error(&loc
, state
,
5813 "declaration of function `%s' not allowed within "
5814 "function body", name
);
5817 validate_identifier(name
, this->get_location(), state
);
5819 /* Convert the list of function parameters to HIR now so that they can be
5820 * used below to compare this function's signature with previously seen
5821 * signatures for functions with the same name.
5823 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5825 & hir_parameters
, state
);
5827 const char *return_type_name
;
5828 const glsl_type
*return_type
=
5829 this->return_type
->glsl_type(& return_type_name
, state
);
5832 YYLTYPE loc
= this->get_location();
5833 _mesa_glsl_error(&loc
, state
,
5834 "function `%s' has undeclared return type `%s'",
5835 name
, return_type_name
);
5836 return_type
= glsl_type::error_type
;
5839 /* ARB_shader_subroutine states:
5840 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5841 * subroutine(...) to a function declaration."
5843 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
5844 YYLTYPE loc
= this->get_location();
5845 _mesa_glsl_error(&loc
, state
,
5846 "function declaration `%s' cannot have subroutine prepended",
5850 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5851 * "No qualifier is allowed on the return type of a function."
5853 if (this->return_type
->has_qualifiers(state
)) {
5854 YYLTYPE loc
= this->get_location();
5855 _mesa_glsl_error(& loc
, state
,
5856 "function `%s' return type has qualifiers", name
);
5859 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5861 * "Arrays are allowed as arguments and as the return type. In both
5862 * cases, the array must be explicitly sized."
5864 if (return_type
->is_unsized_array()) {
5865 YYLTYPE loc
= this->get_location();
5866 _mesa_glsl_error(& loc
, state
,
5867 "function `%s' return type array must be explicitly "
5871 /* From Section 6.1 (Function Definitions) of the GLSL 1.00 spec:
5873 * "Arrays are allowed as arguments, but not as the return type. [...]
5874 * The return type can also be a structure if the structure does not
5875 * contain an array."
5877 if (state
->language_version
== 100 && return_type
->contains_array()) {
5878 YYLTYPE loc
= this->get_location();
5879 _mesa_glsl_error(& loc
, state
,
5880 "function `%s' return type contains an array", name
);
5883 /* From section 4.1.7 of the GLSL 4.40 spec:
5885 * "[Opaque types] can only be declared as function parameters
5886 * or uniform-qualified variables."
5888 * The ARB_bindless_texture spec doesn't clearly state this, but as it says
5889 * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X,
5890 * (Images)", this should be allowed.
5892 if (return_type
->contains_atomic() ||
5893 (!state
->has_bindless() && return_type
->contains_opaque())) {
5894 YYLTYPE loc
= this->get_location();
5895 _mesa_glsl_error(&loc
, state
,
5896 "function `%s' return type can't contain an %s type",
5897 name
, state
->has_bindless() ? "atomic" : "opaque");
5901 if (return_type
->is_subroutine()) {
5902 YYLTYPE loc
= this->get_location();
5903 _mesa_glsl_error(&loc
, state
,
5904 "function `%s' return type can't be a subroutine type",
5909 /* Create an ir_function if one doesn't already exist. */
5910 f
= state
->symbols
->get_function(name
);
5912 f
= new(ctx
) ir_function(name
);
5913 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
5914 if (!state
->symbols
->add_function(f
)) {
5915 /* This function name shadows a non-function use of the same name. */
5916 YYLTYPE loc
= this->get_location();
5917 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5918 "non-function", name
);
5922 emit_function(state
, f
);
5925 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5927 * "A shader cannot redefine or overload built-in functions."
5929 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5931 * "User code can overload the built-in functions but cannot redefine
5934 if (state
->es_shader
) {
5935 /* Local shader has no exact candidates; check the built-ins. */
5936 _mesa_glsl_initialize_builtin_functions();
5937 if (state
->language_version
>= 300 &&
5938 _mesa_glsl_has_builtin_function(state
, name
)) {
5939 YYLTYPE loc
= this->get_location();
5940 _mesa_glsl_error(& loc
, state
,
5941 "A shader cannot redefine or overload built-in "
5942 "function `%s' in GLSL ES 3.00", name
);
5946 if (state
->language_version
== 100) {
5947 ir_function_signature
*sig
=
5948 _mesa_glsl_find_builtin_function(state
, name
, &hir_parameters
);
5949 if (sig
&& sig
->is_builtin()) {
5950 _mesa_glsl_error(& loc
, state
,
5951 "A shader cannot redefine built-in "
5952 "function `%s' in GLSL ES 1.00", name
);
5957 /* Verify that this function's signature either doesn't match a previously
5958 * seen signature for a function with the same name, or, if a match is found,
5959 * that the previously seen signature does not have an associated definition.
5961 if (state
->es_shader
|| f
->has_user_signature()) {
5962 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5964 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5965 if (badvar
!= NULL
) {
5966 YYLTYPE loc
= this->get_location();
5968 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5969 "qualifiers don't match prototype", name
, badvar
);
5972 if (sig
->return_type
!= return_type
) {
5973 YYLTYPE loc
= this->get_location();
5975 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5976 "match prototype", name
);
5979 if (sig
->is_defined
) {
5980 if (is_definition
) {
5981 YYLTYPE loc
= this->get_location();
5982 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5984 /* We just encountered a prototype that exactly matches a
5985 * function that's already been defined. This is redundant,
5986 * and we should ignore it.
5990 } else if (state
->language_version
== 100 && !is_definition
) {
5991 /* From the GLSL 1.00 spec, section 4.2.7:
5993 * "A particular variable, structure or function declaration
5994 * may occur at most once within a scope with the exception
5995 * that a single function prototype plus the corresponding
5996 * function definition are allowed."
5998 YYLTYPE loc
= this->get_location();
5999 _mesa_glsl_error(&loc
, state
, "function `%s' redeclared", name
);
6004 /* Verify the return type of main() */
6005 if (strcmp(name
, "main") == 0) {
6006 if (! return_type
->is_void()) {
6007 YYLTYPE loc
= this->get_location();
6009 _mesa_glsl_error(& loc
, state
, "main() must return void");
6012 if (!hir_parameters
.is_empty()) {
6013 YYLTYPE loc
= this->get_location();
6015 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
6019 /* Finish storing the information about this new function in its signature.
6022 sig
= new(ctx
) ir_function_signature(return_type
);
6023 f
->add_signature(sig
);
6026 sig
->replace_parameters(&hir_parameters
);
6029 if (this->return_type
->qualifier
.subroutine_list
) {
6032 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
6033 unsigned qual_index
;
6034 if (process_qualifier_constant(state
, &loc
, "index",
6035 this->return_type
->qualifier
.index
,
6037 if (!state
->has_explicit_uniform_location()) {
6038 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
6039 "GL_ARB_explicit_uniform_location or "
6041 } else if (qual_index
>= MAX_SUBROUTINES
) {
6042 _mesa_glsl_error(&loc
, state
,
6043 "invalid subroutine index (%d) index must "
6044 "be a number between 0 and "
6045 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
6046 MAX_SUBROUTINES
- 1);
6048 f
->subroutine_index
= qual_index
;
6053 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
6054 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
6055 f
->num_subroutine_types
);
6057 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
6058 const struct glsl_type
*type
;
6059 /* the subroutine type must be already declared */
6060 type
= state
->symbols
->get_type(decl
->identifier
);
6062 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
6065 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
6066 ir_function
*fn
= state
->subroutine_types
[i
];
6067 ir_function_signature
*tsig
= NULL
;
6069 if (strcmp(fn
->name
, decl
->identifier
))
6072 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
6075 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
6077 if (tsig
->return_type
!= sig
->return_type
) {
6078 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
6082 f
->subroutine_types
[idx
++] = type
;
6084 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
6086 state
->num_subroutines
+ 1);
6087 state
->subroutines
[state
->num_subroutines
] = f
;
6088 state
->num_subroutines
++;
6092 if (this->return_type
->qualifier
.is_subroutine_decl()) {
6093 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
6094 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
6097 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
6099 state
->num_subroutine_types
+ 1);
6100 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
6101 state
->num_subroutine_types
++;
6103 f
->is_subroutine
= true;
6106 /* Function declarations (prototypes) do not have r-values.
6113 ast_function_definition::hir(exec_list
*instructions
,
6114 struct _mesa_glsl_parse_state
*state
)
6116 prototype
->is_definition
= true;
6117 prototype
->hir(instructions
, state
);
6119 ir_function_signature
*signature
= prototype
->signature
;
6120 if (signature
== NULL
)
6123 assert(state
->current_function
== NULL
);
6124 state
->current_function
= signature
;
6125 state
->found_return
= false;
6127 /* Duplicate parameters declared in the prototype as concrete variables.
6128 * Add these to the symbol table.
6130 state
->symbols
->push_scope();
6131 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
6132 assert(var
->as_variable() != NULL
);
6134 /* The only way a parameter would "exist" is if two parameters have
6137 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
6138 YYLTYPE loc
= this->get_location();
6140 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
6142 state
->symbols
->add_variable(var
);
6146 /* Convert the body of the function to HIR. */
6147 this->body
->hir(&signature
->body
, state
);
6148 signature
->is_defined
= true;
6150 state
->symbols
->pop_scope();
6152 assert(state
->current_function
== signature
);
6153 state
->current_function
= NULL
;
6155 if (!signature
->return_type
->is_void() && !state
->found_return
) {
6156 YYLTYPE loc
= this->get_location();
6157 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
6158 "%s, but no return statement",
6159 signature
->function_name(),
6160 signature
->return_type
->name
);
6163 /* Function definitions do not have r-values.
6170 ast_jump_statement::hir(exec_list
*instructions
,
6171 struct _mesa_glsl_parse_state
*state
)
6178 assert(state
->current_function
);
6180 if (opt_return_value
) {
6181 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
6183 /* The value of the return type can be NULL if the shader says
6184 * 'return foo();' and foo() is a function that returns void.
6186 * NOTE: The GLSL spec doesn't say that this is an error. The type
6187 * of the return value is void. If the return type of the function is
6188 * also void, then this should compile without error. Seriously.
6190 const glsl_type
*const ret_type
=
6191 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
6193 /* Implicit conversions are not allowed for return values prior to
6194 * ARB_shading_language_420pack.
6196 if (state
->current_function
->return_type
!= ret_type
) {
6197 YYLTYPE loc
= this->get_location();
6199 if (state
->has_420pack()) {
6200 if (!apply_implicit_conversion(state
->current_function
->return_type
,
6202 _mesa_glsl_error(& loc
, state
,
6203 "could not implicitly convert return value "
6204 "to %s, in function `%s'",
6205 state
->current_function
->return_type
->name
,
6206 state
->current_function
->function_name());
6209 _mesa_glsl_error(& loc
, state
,
6210 "`return' with wrong type %s, in function `%s' "
6213 state
->current_function
->function_name(),
6214 state
->current_function
->return_type
->name
);
6216 } else if (state
->current_function
->return_type
->base_type
==
6218 YYLTYPE loc
= this->get_location();
6220 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
6221 * specs add a clarification:
6223 * "A void function can only use return without a return argument, even if
6224 * the return argument has void type. Return statements only accept values:
6227 * void func2() { return func1(); } // illegal return statement"
6229 _mesa_glsl_error(& loc
, state
,
6230 "void functions can only use `return' without a "
6234 inst
= new(ctx
) ir_return(ret
);
6236 if (state
->current_function
->return_type
->base_type
!=
6238 YYLTYPE loc
= this->get_location();
6240 _mesa_glsl_error(& loc
, state
,
6241 "`return' with no value, in function %s returning "
6243 state
->current_function
->function_name());
6245 inst
= new(ctx
) ir_return
;
6248 state
->found_return
= true;
6249 instructions
->push_tail(inst
);
6254 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6255 YYLTYPE loc
= this->get_location();
6257 _mesa_glsl_error(& loc
, state
,
6258 "`discard' may only appear in a fragment shader");
6260 instructions
->push_tail(new(ctx
) ir_discard
);
6265 if (mode
== ast_continue
&&
6266 state
->loop_nesting_ast
== NULL
) {
6267 YYLTYPE loc
= this->get_location();
6269 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
6270 } else if (mode
== ast_break
&&
6271 state
->loop_nesting_ast
== NULL
&&
6272 state
->switch_state
.switch_nesting_ast
== NULL
) {
6273 YYLTYPE loc
= this->get_location();
6275 _mesa_glsl_error(& loc
, state
,
6276 "break may only appear in a loop or a switch");
6278 /* For a loop, inline the for loop expression again, since we don't
6279 * know where near the end of the loop body the normal copy of it is
6280 * going to be placed. Same goes for the condition for a do-while
6283 if (state
->loop_nesting_ast
!= NULL
&&
6284 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
6285 if (state
->loop_nesting_ast
->rest_expression
) {
6286 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
6289 if (state
->loop_nesting_ast
->mode
==
6290 ast_iteration_statement::ast_do_while
) {
6291 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
6295 if (state
->switch_state
.is_switch_innermost
&&
6296 mode
== ast_continue
) {
6297 /* Set 'continue_inside' to true. */
6298 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6299 ir_dereference_variable
*deref_continue_inside_var
=
6300 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6301 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6304 /* Break out from the switch, continue for the loop will
6305 * be called right after switch. */
6306 ir_loop_jump
*const jump
=
6307 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6308 instructions
->push_tail(jump
);
6310 } else if (state
->switch_state
.is_switch_innermost
&&
6311 mode
== ast_break
) {
6312 /* Force break out of switch by inserting a break. */
6313 ir_loop_jump
*const jump
=
6314 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6315 instructions
->push_tail(jump
);
6317 ir_loop_jump
*const jump
=
6318 new(ctx
) ir_loop_jump((mode
== ast_break
)
6319 ? ir_loop_jump::jump_break
6320 : ir_loop_jump::jump_continue
);
6321 instructions
->push_tail(jump
);
6328 /* Jump instructions do not have r-values.
6335 ast_selection_statement::hir(exec_list
*instructions
,
6336 struct _mesa_glsl_parse_state
*state
)
6340 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6342 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6344 * "Any expression whose type evaluates to a Boolean can be used as the
6345 * conditional expression bool-expression. Vector types are not accepted
6346 * as the expression to if."
6348 * The checks are separated so that higher quality diagnostics can be
6349 * generated for cases where both rules are violated.
6351 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6352 YYLTYPE loc
= this->condition
->get_location();
6354 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6358 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6360 if (then_statement
!= NULL
) {
6361 state
->symbols
->push_scope();
6362 then_statement
->hir(& stmt
->then_instructions
, state
);
6363 state
->symbols
->pop_scope();
6366 if (else_statement
!= NULL
) {
6367 state
->symbols
->push_scope();
6368 else_statement
->hir(& stmt
->else_instructions
, state
);
6369 state
->symbols
->pop_scope();
6372 instructions
->push_tail(stmt
);
6374 /* if-statements do not have r-values.
6380 /* Used for detection of duplicate case values, compare
6381 * given contents directly.
6384 compare_case_value(const void *a
, const void *b
)
6386 return *(unsigned *) a
== *(unsigned *) b
;
6390 /* Used for detection of duplicate case values, just
6391 * returns key contents as is.
6394 key_contents(const void *key
)
6396 return *(unsigned *) key
;
6401 ast_switch_statement::hir(exec_list
*instructions
,
6402 struct _mesa_glsl_parse_state
*state
)
6406 ir_rvalue
*const test_expression
=
6407 this->test_expression
->hir(instructions
, state
);
6409 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6411 * "The type of init-expression in a switch statement must be a
6414 if (!test_expression
->type
->is_scalar() ||
6415 !test_expression
->type
->is_integer()) {
6416 YYLTYPE loc
= this->test_expression
->get_location();
6418 _mesa_glsl_error(& loc
,
6420 "switch-statement expression must be scalar "
6424 /* Track the switch-statement nesting in a stack-like manner.
6426 struct glsl_switch_state saved
= state
->switch_state
;
6428 state
->switch_state
.is_switch_innermost
= true;
6429 state
->switch_state
.switch_nesting_ast
= this;
6430 state
->switch_state
.labels_ht
=
6431 _mesa_hash_table_create(NULL
, key_contents
,
6432 compare_case_value
);
6433 state
->switch_state
.previous_default
= NULL
;
6435 /* Initalize is_fallthru state to false.
6437 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6438 state
->switch_state
.is_fallthru_var
=
6439 new(ctx
) ir_variable(glsl_type::bool_type
,
6440 "switch_is_fallthru_tmp",
6442 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6444 ir_dereference_variable
*deref_is_fallthru_var
=
6445 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6446 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6449 /* Initialize continue_inside state to false.
6451 state
->switch_state
.continue_inside
=
6452 new(ctx
) ir_variable(glsl_type::bool_type
,
6453 "continue_inside_tmp",
6455 instructions
->push_tail(state
->switch_state
.continue_inside
);
6457 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6458 ir_dereference_variable
*deref_continue_inside_var
=
6459 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6460 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6463 state
->switch_state
.run_default
=
6464 new(ctx
) ir_variable(glsl_type::bool_type
,
6467 instructions
->push_tail(state
->switch_state
.run_default
);
6469 /* Loop around the switch is used for flow control. */
6470 ir_loop
* loop
= new(ctx
) ir_loop();
6471 instructions
->push_tail(loop
);
6473 /* Cache test expression.
6475 test_to_hir(&loop
->body_instructions
, state
);
6477 /* Emit code for body of switch stmt.
6479 body
->hir(&loop
->body_instructions
, state
);
6481 /* Insert a break at the end to exit loop. */
6482 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6483 loop
->body_instructions
.push_tail(jump
);
6485 /* If we are inside loop, check if continue got called inside switch. */
6486 if (state
->loop_nesting_ast
!= NULL
) {
6487 ir_dereference_variable
*deref_continue_inside
=
6488 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6489 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6490 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6492 if (state
->loop_nesting_ast
!= NULL
) {
6493 if (state
->loop_nesting_ast
->rest_expression
) {
6494 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6497 if (state
->loop_nesting_ast
->mode
==
6498 ast_iteration_statement::ast_do_while
) {
6499 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6502 irif
->then_instructions
.push_tail(jump
);
6503 instructions
->push_tail(irif
);
6506 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6508 state
->switch_state
= saved
;
6510 /* Switch statements do not have r-values. */
6516 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6517 struct _mesa_glsl_parse_state
*state
)
6521 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6522 * on the switch test case. The first one would be already raised when
6523 * getting the test_expression at ast_switch_statement::hir
6525 test_expression
->set_is_lhs(true);
6526 /* Cache value of test expression. */
6527 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6529 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6532 ir_dereference_variable
*deref_test_var
=
6533 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6535 instructions
->push_tail(state
->switch_state
.test_var
);
6536 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6541 ast_switch_body::hir(exec_list
*instructions
,
6542 struct _mesa_glsl_parse_state
*state
)
6545 stmts
->hir(instructions
, state
);
6547 /* Switch bodies do not have r-values. */
6552 ast_case_statement_list::hir(exec_list
*instructions
,
6553 struct _mesa_glsl_parse_state
*state
)
6555 exec_list default_case
, after_default
, tmp
;
6557 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6558 case_stmt
->hir(&tmp
, state
);
6561 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6562 default_case
.append_list(&tmp
);
6566 /* If default case found, append 'after_default' list. */
6567 if (!default_case
.is_empty())
6568 after_default
.append_list(&tmp
);
6570 instructions
->append_list(&tmp
);
6573 /* Handle the default case. This is done here because default might not be
6574 * the last case. We need to add checks against following cases first to see
6575 * if default should be chosen or not.
6577 if (!default_case
.is_empty()) {
6579 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6580 ir_dereference_variable
*deref_run_default_var
=
6581 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6583 /* Choose to run default case initially, following conditional
6584 * assignments might change this.
6586 ir_assignment
*const init_var
=
6587 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6588 instructions
->push_tail(init_var
);
6590 /* Default case was the last one, no checks required. */
6591 if (after_default
.is_empty()) {
6592 instructions
->append_list(&default_case
);
6596 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6597 ir_assignment
*assign
= ir
->as_assignment();
6602 /* Clone the check between case label and init expression. */
6603 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6604 ir_expression
*clone
= exp
->clone(state
, NULL
);
6606 ir_dereference_variable
*deref_var
=
6607 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6608 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6610 ir_assignment
*const set_false
=
6611 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6613 instructions
->push_tail(set_false
);
6616 /* Append default case and all cases after it. */
6617 instructions
->append_list(&default_case
);
6618 instructions
->append_list(&after_default
);
6621 /* Case statements do not have r-values. */
6626 ast_case_statement::hir(exec_list
*instructions
,
6627 struct _mesa_glsl_parse_state
*state
)
6629 labels
->hir(instructions
, state
);
6631 /* Guard case statements depending on fallthru state. */
6632 ir_dereference_variable
*const deref_fallthru_guard
=
6633 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6634 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6636 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6637 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6639 instructions
->push_tail(test_fallthru
);
6641 /* Case statements do not have r-values. */
6647 ast_case_label_list::hir(exec_list
*instructions
,
6648 struct _mesa_glsl_parse_state
*state
)
6650 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6651 label
->hir(instructions
, state
);
6653 /* Case labels do not have r-values. */
6658 ast_case_label::hir(exec_list
*instructions
,
6659 struct _mesa_glsl_parse_state
*state
)
6663 ir_dereference_variable
*deref_fallthru_var
=
6664 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6666 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6668 /* If not default case, ... */
6669 if (this->test_value
!= NULL
) {
6670 /* Conditionally set fallthru state based on
6671 * comparison of cached test expression value to case label.
6673 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6674 ir_constant
*label_const
= label_rval
->constant_expression_value(ctx
);
6677 YYLTYPE loc
= this->test_value
->get_location();
6679 _mesa_glsl_error(& loc
, state
,
6680 "switch statement case label must be a "
6681 "constant expression");
6683 /* Stuff a dummy value in to allow processing to continue. */
6684 label_const
= new(ctx
) ir_constant(0);
6687 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6688 (void *)(uintptr_t)&label_const
->value
.u
[0]);
6691 ast_expression
*previous_label
= (ast_expression
*) entry
->data
;
6692 YYLTYPE loc
= this->test_value
->get_location();
6693 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6695 loc
= previous_label
->get_location();
6696 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6698 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6699 (void *)(uintptr_t)&label_const
->value
.u
[0],
6704 ir_dereference_variable
*deref_test_var
=
6705 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6707 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6712 * From GLSL 4.40 specification section 6.2 ("Selection"):
6714 * "The type of the init-expression value in a switch statement must
6715 * be a scalar int or uint. The type of the constant-expression value
6716 * in a case label also must be a scalar int or uint. When any pair
6717 * of these values is tested for "equal value" and the types do not
6718 * match, an implicit conversion will be done to convert the int to a
6719 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6722 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6723 YYLTYPE loc
= this->test_value
->get_location();
6725 const glsl_type
*type_a
= label_const
->type
;
6726 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6728 /* Check if int->uint implicit conversion is supported. */
6729 bool integer_conversion_supported
=
6730 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6733 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6734 !integer_conversion_supported
) {
6735 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6736 "init-expression and case label (%s != %s)",
6737 type_a
->name
, type_b
->name
);
6739 /* Conversion of the case label. */
6740 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6741 if (!apply_implicit_conversion(glsl_type::uint_type
,
6742 test_cond
->operands
[0], state
))
6743 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6745 /* Conversion of the init-expression value. */
6746 if (!apply_implicit_conversion(glsl_type::uint_type
,
6747 test_cond
->operands
[1], state
))
6748 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6753 ir_assignment
*set_fallthru_on_test
=
6754 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6756 instructions
->push_tail(set_fallthru_on_test
);
6757 } else { /* default case */
6758 if (state
->switch_state
.previous_default
) {
6759 YYLTYPE loc
= this->get_location();
6760 _mesa_glsl_error(& loc
, state
,
6761 "multiple default labels in one switch");
6763 loc
= state
->switch_state
.previous_default
->get_location();
6764 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6766 state
->switch_state
.previous_default
= this;
6768 /* Set fallthru condition on 'run_default' bool. */
6769 ir_dereference_variable
*deref_run_default
=
6770 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6771 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6772 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6776 /* Set falltrhu state. */
6777 ir_assignment
*set_fallthru
=
6778 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6780 instructions
->push_tail(set_fallthru
);
6783 /* Case statements do not have r-values. */
6788 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6789 struct _mesa_glsl_parse_state
*state
)
6793 if (condition
!= NULL
) {
6794 ir_rvalue
*const cond
=
6795 condition
->hir(instructions
, state
);
6798 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6799 YYLTYPE loc
= condition
->get_location();
6801 _mesa_glsl_error(& loc
, state
,
6802 "loop condition must be scalar boolean");
6804 /* As the first code in the loop body, generate a block that looks
6805 * like 'if (!condition) break;' as the loop termination condition.
6807 ir_rvalue
*const not_cond
=
6808 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6810 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6812 ir_jump
*const break_stmt
=
6813 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6815 if_stmt
->then_instructions
.push_tail(break_stmt
);
6816 instructions
->push_tail(if_stmt
);
6823 ast_iteration_statement::hir(exec_list
*instructions
,
6824 struct _mesa_glsl_parse_state
*state
)
6828 /* For-loops and while-loops start a new scope, but do-while loops do not.
6830 if (mode
!= ast_do_while
)
6831 state
->symbols
->push_scope();
6833 if (init_statement
!= NULL
)
6834 init_statement
->hir(instructions
, state
);
6836 ir_loop
*const stmt
= new(ctx
) ir_loop();
6837 instructions
->push_tail(stmt
);
6839 /* Track the current loop nesting. */
6840 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6842 state
->loop_nesting_ast
= this;
6844 /* Likewise, indicate that following code is closest to a loop,
6845 * NOT closest to a switch.
6847 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6848 state
->switch_state
.is_switch_innermost
= false;
6850 if (mode
!= ast_do_while
)
6851 condition_to_hir(&stmt
->body_instructions
, state
);
6854 body
->hir(& stmt
->body_instructions
, state
);
6856 if (rest_expression
!= NULL
)
6857 rest_expression
->hir(& stmt
->body_instructions
, state
);
6859 if (mode
== ast_do_while
)
6860 condition_to_hir(&stmt
->body_instructions
, state
);
6862 if (mode
!= ast_do_while
)
6863 state
->symbols
->pop_scope();
6865 /* Restore previous nesting before returning. */
6866 state
->loop_nesting_ast
= nesting_ast
;
6867 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6869 /* Loops do not have r-values.
6876 * Determine if the given type is valid for establishing a default precision
6879 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6881 * "The precision statement
6883 * precision precision-qualifier type;
6885 * can be used to establish a default precision qualifier. The type field
6886 * can be either int or float or any of the sampler types, and the
6887 * precision-qualifier can be lowp, mediump, or highp."
6889 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6890 * qualifiers on sampler types, but this seems like an oversight (since the
6891 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6892 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6896 is_valid_default_precision_type(const struct glsl_type
*const type
)
6901 switch (type
->base_type
) {
6903 case GLSL_TYPE_FLOAT
:
6904 /* "int" and "float" are valid, but vectors and matrices are not. */
6905 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6906 case GLSL_TYPE_SAMPLER
:
6907 case GLSL_TYPE_IMAGE
:
6908 case GLSL_TYPE_ATOMIC_UINT
:
6917 ast_type_specifier::hir(exec_list
*instructions
,
6918 struct _mesa_glsl_parse_state
*state
)
6920 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6923 YYLTYPE loc
= this->get_location();
6925 /* If this is a precision statement, check that the type to which it is
6926 * applied is either float or int.
6928 * From section 4.5.3 of the GLSL 1.30 spec:
6929 * "The precision statement
6930 * precision precision-qualifier type;
6931 * can be used to establish a default precision qualifier. The type
6932 * field can be either int or float [...]. Any other types or
6933 * qualifiers will result in an error.
6935 if (this->default_precision
!= ast_precision_none
) {
6936 if (!state
->check_precision_qualifiers_allowed(&loc
))
6939 if (this->structure
!= NULL
) {
6940 _mesa_glsl_error(&loc
, state
,
6941 "precision qualifiers do not apply to structures");
6945 if (this->array_specifier
!= NULL
) {
6946 _mesa_glsl_error(&loc
, state
,
6947 "default precision statements do not apply to "
6952 const struct glsl_type
*const type
=
6953 state
->symbols
->get_type(this->type_name
);
6954 if (!is_valid_default_precision_type(type
)) {
6955 _mesa_glsl_error(&loc
, state
,
6956 "default precision statements apply only to "
6957 "float, int, and opaque types");
6961 if (state
->es_shader
) {
6962 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6965 * "Non-precision qualified declarations will use the precision
6966 * qualifier specified in the most recent precision statement
6967 * that is still in scope. The precision statement has the same
6968 * scoping rules as variable declarations. If it is declared
6969 * inside a compound statement, its effect stops at the end of
6970 * the innermost statement it was declared in. Precision
6971 * statements in nested scopes override precision statements in
6972 * outer scopes. Multiple precision statements for the same basic
6973 * type can appear inside the same scope, with later statements
6974 * overriding earlier statements within that scope."
6976 * Default precision specifications follow the same scope rules as
6977 * variables. So, we can track the state of the default precision
6978 * qualifiers in the symbol table, and the rules will just work. This
6979 * is a slight abuse of the symbol table, but it has the semantics
6982 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6983 this->default_precision
);
6986 /* FINISHME: Translate precision statements into IR. */
6990 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6991 * process_record_constructor() can do type-checking on C-style initializer
6992 * expressions of structs, but ast_struct_specifier should only be translated
6993 * to HIR if it is declaring the type of a structure.
6995 * The ->is_declaration field is false for initializers of variables
6996 * declared separately from the struct's type definition.
6998 * struct S { ... }; (is_declaration = true)
6999 * struct T { ... } t = { ... }; (is_declaration = true)
7000 * S s = { ... }; (is_declaration = false)
7002 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
7003 return this->structure
->hir(instructions
, state
);
7010 * Process a structure or interface block tree into an array of structure fields
7012 * After parsing, where there are some syntax differnces, structures and
7013 * interface blocks are almost identical. They are similar enough that the
7014 * AST for each can be processed the same way into a set of
7015 * \c glsl_struct_field to describe the members.
7017 * If we're processing an interface block, var_mode should be the type of the
7018 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
7019 * ir_var_shader_storage). If we're processing a structure, var_mode should be
7023 * The number of fields processed. A pointer to the array structure fields is
7024 * stored in \c *fields_ret.
7027 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
7028 struct _mesa_glsl_parse_state
*state
,
7029 exec_list
*declarations
,
7030 glsl_struct_field
**fields_ret
,
7032 enum glsl_matrix_layout matrix_layout
,
7033 bool allow_reserved_names
,
7034 ir_variable_mode var_mode
,
7035 ast_type_qualifier
*layout
,
7036 unsigned block_stream
,
7037 unsigned block_xfb_buffer
,
7038 unsigned block_xfb_offset
,
7039 unsigned expl_location
,
7040 unsigned expl_align
)
7042 unsigned decl_count
= 0;
7043 unsigned next_offset
= 0;
7045 /* Make an initial pass over the list of fields to determine how
7046 * many there are. Each element in this list is an ast_declarator_list.
7047 * This means that we actually need to count the number of elements in the
7048 * 'declarations' list in each of the elements.
7050 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7051 decl_count
+= decl_list
->declarations
.length();
7054 /* Allocate storage for the fields and process the field
7055 * declarations. As the declarations are processed, try to also convert
7056 * the types to HIR. This ensures that structure definitions embedded in
7057 * other structure definitions or in interface blocks are processed.
7059 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
7062 bool first_member
= true;
7063 bool first_member_has_explicit_location
= false;
7066 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7067 const char *type_name
;
7068 YYLTYPE loc
= decl_list
->get_location();
7070 decl_list
->type
->specifier
->hir(instructions
, state
);
7072 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
7074 * "Anonymous structures are not supported; so embedded structures
7075 * must have a declarator. A name given to an embedded struct is
7076 * scoped at the same level as the struct it is embedded in."
7078 * The same section of the GLSL 1.20 spec says:
7080 * "Anonymous structures are not supported. Embedded structures are
7083 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
7084 * embedded structures in 1.10 only.
7086 if (state
->language_version
!= 110 &&
7087 decl_list
->type
->specifier
->structure
!= NULL
)
7088 _mesa_glsl_error(&loc
, state
,
7089 "embedded structure declarations are not allowed");
7091 const glsl_type
*decl_type
=
7092 decl_list
->type
->glsl_type(& type_name
, state
);
7094 const struct ast_type_qualifier
*const qual
=
7095 &decl_list
->type
->qualifier
;
7097 /* From section 4.3.9 of the GLSL 4.40 spec:
7099 * "[In interface blocks] opaque types are not allowed."
7101 * It should be impossible for decl_type to be NULL here. Cases that
7102 * might naturally lead to decl_type being NULL, especially for the
7103 * is_interface case, will have resulted in compilation having
7104 * already halted due to a syntax error.
7109 /* From section 4.3.7 of the ARB_bindless_texture spec:
7111 * "(remove the following bullet from the last list on p. 39,
7112 * thereby permitting sampler types in interface blocks; image
7113 * types are also permitted in blocks by this extension)"
7115 * * sampler types are not allowed
7117 if (decl_type
->contains_atomic() ||
7118 (!state
->has_bindless() && decl_type
->contains_opaque())) {
7119 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
7120 "interface block contains %s variable",
7121 state
->has_bindless() ? "atomic" : "opaque");
7124 if (decl_type
->contains_atomic()) {
7125 /* From section 4.1.7.3 of the GLSL 4.40 spec:
7127 * "Members of structures cannot be declared as atomic counter
7130 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
7133 if (!state
->has_bindless() && decl_type
->contains_image()) {
7134 /* FINISHME: Same problem as with atomic counters.
7135 * FINISHME: Request clarification from Khronos and add
7136 * FINISHME: spec quotation here.
7138 _mesa_glsl_error(&loc
, state
, "image in structure");
7142 if (qual
->flags
.q
.explicit_binding
) {
7143 _mesa_glsl_error(&loc
, state
,
7144 "binding layout qualifier cannot be applied "
7145 "to struct or interface block members");
7149 if (!first_member
) {
7150 if (!layout
->flags
.q
.explicit_location
&&
7151 ((first_member_has_explicit_location
&&
7152 !qual
->flags
.q
.explicit_location
) ||
7153 (!first_member_has_explicit_location
&&
7154 qual
->flags
.q
.explicit_location
))) {
7155 _mesa_glsl_error(&loc
, state
,
7156 "when block-level location layout qualifier "
7157 "is not supplied either all members must "
7158 "have a location layout qualifier or all "
7159 "members must not have a location layout "
7163 first_member
= false;
7164 first_member_has_explicit_location
=
7165 qual
->flags
.q
.explicit_location
;
7169 if (qual
->flags
.q
.std140
||
7170 qual
->flags
.q
.std430
||
7171 qual
->flags
.q
.packed
||
7172 qual
->flags
.q
.shared
) {
7173 _mesa_glsl_error(&loc
, state
,
7174 "uniform/shader storage block layout qualifiers "
7175 "std140, std430, packed, and shared can only be "
7176 "applied to uniform/shader storage blocks, not "
7180 if (qual
->flags
.q
.constant
) {
7181 _mesa_glsl_error(&loc
, state
,
7182 "const storage qualifier cannot be applied "
7183 "to struct or interface block members");
7186 validate_memory_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7187 validate_image_format_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7189 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
7191 * "A block member may be declared with a stream identifier, but
7192 * the specified stream must match the stream associated with the
7193 * containing block."
7195 if (qual
->flags
.q
.explicit_stream
) {
7196 unsigned qual_stream
;
7197 if (process_qualifier_constant(state
, &loc
, "stream",
7198 qual
->stream
, &qual_stream
) &&
7199 qual_stream
!= block_stream
) {
7200 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
7201 "interface block member does not match "
7202 "the interface block (%u vs %u)", qual_stream
,
7208 unsigned explicit_xfb_buffer
= 0;
7209 if (qual
->flags
.q
.explicit_xfb_buffer
) {
7210 unsigned qual_xfb_buffer
;
7211 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
7212 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
7213 explicit_xfb_buffer
= 1;
7214 if (qual_xfb_buffer
!= block_xfb_buffer
)
7215 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
7216 "interface block member does not match "
7217 "the interface block (%u vs %u)",
7218 qual_xfb_buffer
, block_xfb_buffer
);
7220 xfb_buffer
= (int) qual_xfb_buffer
;
7223 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
7224 xfb_buffer
= (int) block_xfb_buffer
;
7227 int xfb_stride
= -1;
7228 if (qual
->flags
.q
.explicit_xfb_stride
) {
7229 unsigned qual_xfb_stride
;
7230 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
7231 qual
->xfb_stride
, &qual_xfb_stride
)) {
7232 xfb_stride
= (int) qual_xfb_stride
;
7236 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
7237 _mesa_glsl_error(&loc
, state
,
7238 "interpolation qualifiers cannot be used "
7239 "with uniform interface blocks");
7242 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
7243 qual
->has_auxiliary_storage()) {
7244 _mesa_glsl_error(&loc
, state
,
7245 "auxiliary storage qualifiers cannot be used "
7246 "in uniform blocks or structures.");
7249 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
7250 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
7251 _mesa_glsl_error(&loc
, state
,
7252 "row_major and column_major can only be "
7253 "applied to interface blocks");
7255 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
7258 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
7259 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
7260 "readonly and writeonly.");
7263 foreach_list_typed (ast_declaration
, decl
, link
,
7264 &decl_list
->declarations
) {
7265 YYLTYPE loc
= decl
->get_location();
7267 if (!allow_reserved_names
)
7268 validate_identifier(decl
->identifier
, loc
, state
);
7270 const struct glsl_type
*field_type
=
7271 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
7272 validate_array_dimensions(field_type
, state
, &loc
);
7273 fields
[i
].type
= field_type
;
7274 fields
[i
].name
= decl
->identifier
;
7275 fields
[i
].interpolation
=
7276 interpret_interpolation_qualifier(qual
, field_type
,
7277 var_mode
, state
, &loc
);
7278 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
7279 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
7280 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
7281 fields
[i
].precision
= qual
->precision
;
7282 fields
[i
].offset
= -1;
7283 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
7284 fields
[i
].xfb_buffer
= xfb_buffer
;
7285 fields
[i
].xfb_stride
= xfb_stride
;
7287 if (qual
->flags
.q
.explicit_location
) {
7288 unsigned qual_location
;
7289 if (process_qualifier_constant(state
, &loc
, "location",
7290 qual
->location
, &qual_location
)) {
7291 fields
[i
].location
= qual_location
+
7292 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
7293 expl_location
= fields
[i
].location
+
7294 fields
[i
].type
->count_attribute_slots(false);
7297 if (layout
&& layout
->flags
.q
.explicit_location
) {
7298 fields
[i
].location
= expl_location
;
7299 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
7301 fields
[i
].location
= -1;
7305 /* Offset can only be used with std430 and std140 layouts an initial
7306 * value of 0 is used for error detection.
7312 if (qual
->flags
.q
.row_major
||
7313 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7319 if(layout
->flags
.q
.std140
) {
7320 align
= field_type
->std140_base_alignment(row_major
);
7321 size
= field_type
->std140_size(row_major
);
7322 } else if (layout
->flags
.q
.std430
) {
7323 align
= field_type
->std430_base_alignment(row_major
);
7324 size
= field_type
->std430_size(row_major
);
7328 if (qual
->flags
.q
.explicit_offset
) {
7329 unsigned qual_offset
;
7330 if (process_qualifier_constant(state
, &loc
, "offset",
7331 qual
->offset
, &qual_offset
)) {
7332 if (align
!= 0 && size
!= 0) {
7333 if (next_offset
> qual_offset
)
7334 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7335 "offset overlaps previous member");
7337 if (qual_offset
% align
) {
7338 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7339 "must be a multiple of the base "
7340 "alignment of %s", field_type
->name
);
7342 fields
[i
].offset
= qual_offset
;
7343 next_offset
= glsl_align(qual_offset
+ size
, align
);
7345 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7346 "with std430 and std140 layouts");
7351 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7352 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7354 if (align
== 0 || size
== 0) {
7355 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7356 "std430 and std140 layouts");
7357 } else if (qual
->flags
.q
.explicit_align
) {
7358 unsigned member_align
;
7359 if (process_qualifier_constant(state
, &loc
, "align",
7360 qual
->align
, &member_align
)) {
7361 if (member_align
== 0 ||
7362 member_align
& (member_align
- 1)) {
7363 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7364 "in not a power of 2");
7366 fields
[i
].offset
= glsl_align(offset
, member_align
);
7367 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7371 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7372 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7374 } else if (!qual
->flags
.q
.explicit_offset
) {
7375 if (align
!= 0 && size
!= 0)
7376 next_offset
= glsl_align(next_offset
+ size
, align
);
7379 /* From the ARB_enhanced_layouts spec:
7381 * "The given offset applies to the first component of the first
7382 * member of the qualified entity. Then, within the qualified
7383 * entity, subsequent components are each assigned, in order, to
7384 * the next available offset aligned to a multiple of that
7385 * component's size. Aggregate types are flattened down to the
7386 * component level to get this sequence of components."
7388 if (qual
->flags
.q
.explicit_xfb_offset
) {
7389 unsigned xfb_offset
;
7390 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7391 qual
->offset
, &xfb_offset
)) {
7392 fields
[i
].offset
= xfb_offset
;
7393 block_xfb_offset
= fields
[i
].offset
+
7394 4 * field_type
->component_slots();
7397 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7398 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7399 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7400 block_xfb_offset
+= 4 * field_type
->component_slots();
7404 /* Propogate row- / column-major information down the fields of the
7405 * structure or interface block. Structures need this data because
7406 * the structure may contain a structure that contains ... a matrix
7407 * that need the proper layout.
7409 if (is_interface
&& layout
&&
7410 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7411 (field_type
->without_array()->is_matrix()
7412 || field_type
->without_array()->is_record())) {
7413 /* If no layout is specified for the field, inherit the layout
7416 fields
[i
].matrix_layout
= matrix_layout
;
7418 if (qual
->flags
.q
.row_major
)
7419 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7420 else if (qual
->flags
.q
.column_major
)
7421 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7423 /* If we're processing an uniform or buffer block, the matrix
7424 * layout must be decided by this point.
7426 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7427 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7430 /* Memory qualifiers are allowed on buffer and image variables, while
7431 * the format qualifier is only accepted for images.
7433 if (var_mode
== ir_var_shader_storage
||
7434 field_type
->without_array()->is_image()) {
7435 /* For readonly and writeonly qualifiers the field definition,
7436 * if set, overwrites the layout qualifier.
7438 if (qual
->flags
.q
.read_only
) {
7439 fields
[i
].memory_read_only
= true;
7440 fields
[i
].memory_write_only
= false;
7441 } else if (qual
->flags
.q
.write_only
) {
7442 fields
[i
].memory_read_only
= false;
7443 fields
[i
].memory_write_only
= true;
7445 fields
[i
].memory_read_only
=
7446 layout
? layout
->flags
.q
.read_only
: 0;
7447 fields
[i
].memory_write_only
=
7448 layout
? layout
->flags
.q
.write_only
: 0;
7451 /* For other qualifiers, we set the flag if either the layout
7452 * qualifier or the field qualifier are set
7454 fields
[i
].memory_coherent
= qual
->flags
.q
.coherent
||
7455 (layout
&& layout
->flags
.q
.coherent
);
7456 fields
[i
].memory_volatile
= qual
->flags
.q
._volatile
||
7457 (layout
&& layout
->flags
.q
._volatile
);
7458 fields
[i
].memory_restrict
= qual
->flags
.q
.restrict_flag
||
7459 (layout
&& layout
->flags
.q
.restrict_flag
);
7461 if (field_type
->without_array()->is_image()) {
7462 if (qual
->flags
.q
.explicit_image_format
) {
7463 if (qual
->image_base_type
!=
7464 field_type
->without_array()->sampled_type
) {
7465 _mesa_glsl_error(&loc
, state
, "format qualifier doesn't "
7466 "match the base data type of the image");
7469 fields
[i
].image_format
= qual
->image_format
;
7471 if (!qual
->flags
.q
.write_only
) {
7472 _mesa_glsl_error(&loc
, state
, "image not qualified with "
7473 "`writeonly' must have a format layout "
7477 fields
[i
].image_format
= GL_NONE
;
7486 assert(i
== decl_count
);
7488 *fields_ret
= fields
;
7494 ast_struct_specifier::hir(exec_list
*instructions
,
7495 struct _mesa_glsl_parse_state
*state
)
7497 YYLTYPE loc
= this->get_location();
7499 unsigned expl_location
= 0;
7500 if (layout
&& layout
->flags
.q
.explicit_location
) {
7501 if (!process_qualifier_constant(state
, &loc
, "location",
7502 layout
->location
, &expl_location
)) {
7505 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7509 glsl_struct_field
*fields
;
7510 unsigned decl_count
=
7511 ast_process_struct_or_iface_block_members(instructions
,
7513 &this->declarations
,
7516 GLSL_MATRIX_LAYOUT_INHERITED
,
7517 false /* allow_reserved_names */,
7520 0, /* for interface only */
7521 0, /* for interface only */
7522 0, /* for interface only */
7524 0 /* for interface only */);
7526 validate_identifier(this->name
, loc
, state
);
7528 type
= glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7530 if (!type
->is_anonymous() && !state
->symbols
->add_type(name
, type
)) {
7531 const glsl_type
*match
= state
->symbols
->get_type(name
);
7532 /* allow struct matching for desktop GL - older UE4 does this */
7533 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(type
, false))
7534 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7536 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7538 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7540 state
->num_user_structures
+ 1);
7542 s
[state
->num_user_structures
] = type
;
7543 state
->user_structures
= s
;
7544 state
->num_user_structures
++;
7548 /* Structure type definitions do not have r-values.
7555 * Visitor class which detects whether a given interface block has been used.
7557 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7560 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7561 : mode(mode
), block(block
), found(false)
7565 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7567 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7571 return visit_continue
;
7574 bool usage_found() const
7580 ir_variable_mode mode
;
7581 const glsl_type
*block
;
7586 is_unsized_array_last_element(ir_variable
*v
)
7588 const glsl_type
*interface_type
= v
->get_interface_type();
7589 int length
= interface_type
->length
;
7591 assert(v
->type
->is_unsized_array());
7593 /* Check if it is the last element of the interface */
7594 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7600 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7602 var
->data
.memory_read_only
= field
.memory_read_only
;
7603 var
->data
.memory_write_only
= field
.memory_write_only
;
7604 var
->data
.memory_coherent
= field
.memory_coherent
;
7605 var
->data
.memory_volatile
= field
.memory_volatile
;
7606 var
->data
.memory_restrict
= field
.memory_restrict
;
7610 ast_interface_block::hir(exec_list
*instructions
,
7611 struct _mesa_glsl_parse_state
*state
)
7613 YYLTYPE loc
= this->get_location();
7615 /* Interface blocks must be declared at global scope */
7616 if (state
->current_function
!= NULL
) {
7617 _mesa_glsl_error(&loc
, state
,
7618 "Interface block `%s' must be declared "
7623 /* Validate qualifiers:
7625 * - Layout Qualifiers as per the table in Section 4.4
7626 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7628 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7631 * "Additionally, memory qualifiers may also be used in the declaration
7632 * of shader storage blocks"
7634 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7635 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7636 * Layout Qualifiers) of the GLSL 4.50 spec says:
7638 * "The std430 qualifier is supported only for shader storage blocks;
7639 * using std430 on a uniform block will result in a compile-time error."
7641 ast_type_qualifier allowed_blk_qualifiers
;
7642 allowed_blk_qualifiers
.flags
.i
= 0;
7643 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7644 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7645 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7646 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7647 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7648 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7649 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7650 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7651 if (this->layout
.flags
.q
.buffer
) {
7652 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7653 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7654 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7655 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7656 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7657 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7658 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7660 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7663 /* Interface block */
7664 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7666 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7667 if (this->layout
.flags
.q
.out
) {
7668 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7669 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7670 state
->stage
== MESA_SHADER_TESS_CTRL
||
7671 state
->stage
== MESA_SHADER_TESS_EVAL
||
7672 state
->stage
== MESA_SHADER_VERTEX
) {
7673 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7674 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7675 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7676 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7677 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7678 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7679 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7680 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7682 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7683 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7687 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7688 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7689 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7694 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7695 "invalid qualifier for block",
7698 enum glsl_interface_packing packing
;
7699 if (this->layout
.flags
.q
.std140
) {
7700 packing
= GLSL_INTERFACE_PACKING_STD140
;
7701 } else if (this->layout
.flags
.q
.packed
) {
7702 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7703 } else if (this->layout
.flags
.q
.std430
) {
7704 packing
= GLSL_INTERFACE_PACKING_STD430
;
7706 /* The default layout is shared.
7708 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7711 ir_variable_mode var_mode
;
7712 const char *iface_type_name
;
7713 if (this->layout
.flags
.q
.in
) {
7714 var_mode
= ir_var_shader_in
;
7715 iface_type_name
= "in";
7716 } else if (this->layout
.flags
.q
.out
) {
7717 var_mode
= ir_var_shader_out
;
7718 iface_type_name
= "out";
7719 } else if (this->layout
.flags
.q
.uniform
) {
7720 var_mode
= ir_var_uniform
;
7721 iface_type_name
= "uniform";
7722 } else if (this->layout
.flags
.q
.buffer
) {
7723 var_mode
= ir_var_shader_storage
;
7724 iface_type_name
= "buffer";
7726 var_mode
= ir_var_auto
;
7727 iface_type_name
= "UNKNOWN";
7728 assert(!"interface block layout qualifier not found!");
7731 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7732 if (this->layout
.flags
.q
.row_major
)
7733 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7734 else if (this->layout
.flags
.q
.column_major
)
7735 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7737 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7738 exec_list declared_variables
;
7739 glsl_struct_field
*fields
;
7741 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7742 * that we don't have incompatible qualifiers
7744 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7745 _mesa_glsl_error(&loc
, state
,
7746 "Interface block sets both readonly and writeonly");
7749 unsigned qual_stream
;
7750 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7752 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7753 /* If the stream qualifier is invalid it doesn't make sense to continue
7754 * on and try to compare stream layouts on member variables against it
7755 * so just return early.
7760 unsigned qual_xfb_buffer
;
7761 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7762 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7763 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7767 unsigned qual_xfb_offset
;
7768 if (layout
.flags
.q
.explicit_xfb_offset
) {
7769 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7770 layout
.offset
, &qual_xfb_offset
)) {
7775 unsigned qual_xfb_stride
;
7776 if (layout
.flags
.q
.explicit_xfb_stride
) {
7777 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7778 layout
.xfb_stride
, &qual_xfb_stride
)) {
7783 unsigned expl_location
= 0;
7784 if (layout
.flags
.q
.explicit_location
) {
7785 if (!process_qualifier_constant(state
, &loc
, "location",
7786 layout
.location
, &expl_location
)) {
7789 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7790 : VARYING_SLOT_VAR0
;
7794 unsigned expl_align
= 0;
7795 if (layout
.flags
.q
.explicit_align
) {
7796 if (!process_qualifier_constant(state
, &loc
, "align",
7797 layout
.align
, &expl_align
)) {
7800 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7801 _mesa_glsl_error(&loc
, state
, "align layout qualifier is not a "
7808 unsigned int num_variables
=
7809 ast_process_struct_or_iface_block_members(&declared_variables
,
7811 &this->declarations
,
7815 redeclaring_per_vertex
,
7824 if (!redeclaring_per_vertex
) {
7825 validate_identifier(this->block_name
, loc
, state
);
7827 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7829 * "Block names have no other use within a shader beyond interface
7830 * matching; it is a compile-time error to use a block name at global
7831 * scope for anything other than as a block name."
7833 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7834 if (var
&& !var
->type
->is_interface()) {
7835 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7836 "already used in the scope.",
7841 const glsl_type
*earlier_per_vertex
= NULL
;
7842 if (redeclaring_per_vertex
) {
7843 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7844 * the named interface block gl_in, we can find it by looking at the
7845 * previous declaration of gl_in. Otherwise we can find it by looking
7846 * at the previous decalartion of any of the built-in outputs,
7849 * Also check that the instance name and array-ness of the redeclaration
7853 case ir_var_shader_in
:
7854 if (ir_variable
*earlier_gl_in
=
7855 state
->symbols
->get_variable("gl_in")) {
7856 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7858 _mesa_glsl_error(&loc
, state
,
7859 "redeclaration of gl_PerVertex input not allowed "
7861 _mesa_shader_stage_to_string(state
->stage
));
7863 if (this->instance_name
== NULL
||
7864 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7865 !this->array_specifier
->is_single_dimension()) {
7866 _mesa_glsl_error(&loc
, state
,
7867 "gl_PerVertex input must be redeclared as "
7871 case ir_var_shader_out
:
7872 if (ir_variable
*earlier_gl_Position
=
7873 state
->symbols
->get_variable("gl_Position")) {
7874 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7875 } else if (ir_variable
*earlier_gl_out
=
7876 state
->symbols
->get_variable("gl_out")) {
7877 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7879 _mesa_glsl_error(&loc
, state
,
7880 "redeclaration of gl_PerVertex output not "
7881 "allowed in the %s shader",
7882 _mesa_shader_stage_to_string(state
->stage
));
7884 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7885 if (this->instance_name
== NULL
||
7886 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7887 _mesa_glsl_error(&loc
, state
,
7888 "gl_PerVertex output must be redeclared as "
7892 if (this->instance_name
!= NULL
) {
7893 _mesa_glsl_error(&loc
, state
,
7894 "gl_PerVertex output may not be redeclared with "
7895 "an instance name");
7900 _mesa_glsl_error(&loc
, state
,
7901 "gl_PerVertex must be declared as an input or an "
7906 if (earlier_per_vertex
== NULL
) {
7907 /* An error has already been reported. Bail out to avoid null
7908 * dereferences later in this function.
7913 /* Copy locations from the old gl_PerVertex interface block. */
7914 for (unsigned i
= 0; i
< num_variables
; i
++) {
7915 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7917 _mesa_glsl_error(&loc
, state
,
7918 "redeclaration of gl_PerVertex must be a subset "
7919 "of the built-in members of gl_PerVertex");
7921 fields
[i
].location
=
7922 earlier_per_vertex
->fields
.structure
[j
].location
;
7924 earlier_per_vertex
->fields
.structure
[j
].offset
;
7925 fields
[i
].interpolation
=
7926 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7927 fields
[i
].centroid
=
7928 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7930 earlier_per_vertex
->fields
.structure
[j
].sample
;
7932 earlier_per_vertex
->fields
.structure
[j
].patch
;
7933 fields
[i
].precision
=
7934 earlier_per_vertex
->fields
.structure
[j
].precision
;
7935 fields
[i
].explicit_xfb_buffer
=
7936 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7937 fields
[i
].xfb_buffer
=
7938 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7939 fields
[i
].xfb_stride
=
7940 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7944 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7947 * If a built-in interface block is redeclared, it must appear in
7948 * the shader before any use of any member included in the built-in
7949 * declaration, or a compilation error will result.
7951 * This appears to be a clarification to the behaviour established for
7952 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7953 * regardless of GLSL version.
7955 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7956 v
.run(instructions
);
7957 if (v
.usage_found()) {
7958 _mesa_glsl_error(&loc
, state
,
7959 "redeclaration of a built-in interface block must "
7960 "appear before any use of any member of the "
7965 const glsl_type
*block_type
=
7966 glsl_type::get_interface_instance(fields
,
7970 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7973 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7975 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7976 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7979 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7980 YYLTYPE loc
= this->get_location();
7981 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7982 "already taken in the current scope",
7983 this->block_name
, iface_type_name
);
7986 /* Since interface blocks cannot contain statements, it should be
7987 * impossible for the block to generate any instructions.
7989 assert(declared_variables
.is_empty());
7991 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7993 * Geometry shader input variables get the per-vertex values written
7994 * out by vertex shader output variables of the same names. Since a
7995 * geometry shader operates on a set of vertices, each input varying
7996 * variable (or input block, see interface blocks below) needs to be
7997 * declared as an array.
7999 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
8000 var_mode
== ir_var_shader_in
) {
8001 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
8002 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8003 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
8004 !this->layout
.flags
.q
.patch
&&
8005 this->array_specifier
== NULL
&&
8006 var_mode
== ir_var_shader_in
) {
8007 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
8008 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
8009 !this->layout
.flags
.q
.patch
&&
8010 this->array_specifier
== NULL
&&
8011 var_mode
== ir_var_shader_out
) {
8012 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
8016 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
8019 * "If an instance name (instance-name) is used, then it puts all the
8020 * members inside a scope within its own name space, accessed with the
8021 * field selector ( . ) operator (analogously to structures)."
8023 if (this->instance_name
) {
8024 if (redeclaring_per_vertex
) {
8025 /* When a built-in in an unnamed interface block is redeclared,
8026 * get_variable_being_redeclared() calls
8027 * check_builtin_array_max_size() to make sure that built-in array
8028 * variables aren't redeclared to illegal sizes. But we're looking
8029 * at a redeclaration of a named built-in interface block. So we
8030 * have to manually call check_builtin_array_max_size() for all parts
8031 * of the interface that are arrays.
8033 for (unsigned i
= 0; i
< num_variables
; i
++) {
8034 if (fields
[i
].type
->is_array()) {
8035 const unsigned size
= fields
[i
].type
->array_size();
8036 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
8040 validate_identifier(this->instance_name
, loc
, state
);
8045 if (this->array_specifier
!= NULL
) {
8046 const glsl_type
*block_array_type
=
8047 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
8049 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
8051 * For uniform blocks declared an array, each individual array
8052 * element corresponds to a separate buffer object backing one
8053 * instance of the block. As the array size indicates the number
8054 * of buffer objects needed, uniform block array declarations
8055 * must specify an array size.
8057 * And a few paragraphs later:
8059 * Geometry shader input blocks must be declared as arrays and
8060 * follow the array declaration and linking rules for all
8061 * geometry shader inputs. All other input and output block
8062 * arrays must specify an array size.
8064 * The same applies to tessellation shaders.
8066 * The upshot of this is that the only circumstance where an
8067 * interface array size *doesn't* need to be specified is on a
8068 * geometry shader input, tessellation control shader input,
8069 * tessellation control shader output, and tessellation evaluation
8072 if (block_array_type
->is_unsized_array()) {
8073 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
8074 state
->stage
== MESA_SHADER_TESS_CTRL
||
8075 state
->stage
== MESA_SHADER_TESS_EVAL
;
8076 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
8078 if (this->layout
.flags
.q
.in
) {
8080 _mesa_glsl_error(&loc
, state
,
8081 "unsized input block arrays not allowed in "
8083 _mesa_shader_stage_to_string(state
->stage
));
8084 } else if (this->layout
.flags
.q
.out
) {
8086 _mesa_glsl_error(&loc
, state
,
8087 "unsized output block arrays not allowed in "
8089 _mesa_shader_stage_to_string(state
->stage
));
8091 /* by elimination, this is a uniform block array */
8092 _mesa_glsl_error(&loc
, state
,
8093 "unsized uniform block arrays not allowed in "
8095 _mesa_shader_stage_to_string(state
->stage
));
8099 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
8101 * * Arrays of arrays of blocks are not allowed
8103 if (state
->es_shader
&& block_array_type
->is_array() &&
8104 block_array_type
->fields
.array
->is_array()) {
8105 _mesa_glsl_error(&loc
, state
,
8106 "arrays of arrays interface blocks are "
8110 var
= new(state
) ir_variable(block_array_type
,
8111 this->instance_name
,
8114 var
= new(state
) ir_variable(block_type
,
8115 this->instance_name
,
8119 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8120 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8122 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8123 var
->data
.read_only
= true;
8125 var
->data
.patch
= this->layout
.flags
.q
.patch
;
8127 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
8128 handle_geometry_shader_input_decl(state
, loc
, var
);
8129 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8130 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
8131 handle_tess_shader_input_decl(state
, loc
, var
);
8132 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
8133 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
8135 for (unsigned i
= 0; i
< num_variables
; i
++) {
8136 if (var
->data
.mode
== ir_var_shader_storage
)
8137 apply_memory_qualifiers(var
, fields
[i
]);
8140 if (ir_variable
*earlier
=
8141 state
->symbols
->get_variable(this->instance_name
)) {
8142 if (!redeclaring_per_vertex
) {
8143 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
8144 this->instance_name
);
8146 earlier
->data
.how_declared
= ir_var_declared_normally
;
8147 earlier
->type
= var
->type
;
8148 earlier
->reinit_interface_type(block_type
);
8151 if (this->layout
.flags
.q
.explicit_binding
) {
8152 apply_explicit_binding(state
, &loc
, var
, var
->type
,
8156 var
->data
.stream
= qual_stream
;
8157 if (layout
.flags
.q
.explicit_location
) {
8158 var
->data
.location
= expl_location
;
8159 var
->data
.explicit_location
= true;
8162 state
->symbols
->add_variable(var
);
8163 instructions
->push_tail(var
);
8166 /* In order to have an array size, the block must also be declared with
8169 assert(this->array_specifier
== NULL
);
8171 for (unsigned i
= 0; i
< num_variables
; i
++) {
8173 new(state
) ir_variable(fields
[i
].type
,
8174 ralloc_strdup(state
, fields
[i
].name
),
8176 var
->data
.interpolation
= fields
[i
].interpolation
;
8177 var
->data
.centroid
= fields
[i
].centroid
;
8178 var
->data
.sample
= fields
[i
].sample
;
8179 var
->data
.patch
= fields
[i
].patch
;
8180 var
->data
.stream
= qual_stream
;
8181 var
->data
.location
= fields
[i
].location
;
8183 if (fields
[i
].location
!= -1)
8184 var
->data
.explicit_location
= true;
8186 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
8187 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
8189 if (fields
[i
].offset
!= -1)
8190 var
->data
.explicit_xfb_offset
= true;
8191 var
->data
.offset
= fields
[i
].offset
;
8193 var
->init_interface_type(block_type
);
8195 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8196 var
->data
.read_only
= true;
8198 /* Precision qualifiers do not have any meaning in Desktop GLSL */
8199 if (state
->es_shader
) {
8200 var
->data
.precision
=
8201 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
8205 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
8206 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8207 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8209 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
8212 if (var
->data
.mode
== ir_var_shader_storage
)
8213 apply_memory_qualifiers(var
, fields
[i
]);
8215 /* Examine var name here since var may get deleted in the next call */
8216 bool var_is_gl_id
= is_gl_identifier(var
->name
);
8218 if (redeclaring_per_vertex
) {
8219 bool is_redeclaration
;
8220 ir_variable
*declared_var
=
8221 get_variable_being_redeclared(&var
, loc
, state
,
8222 true /* allow_all_redeclarations */,
8224 if (!var_is_gl_id
|| !is_redeclaration
) {
8225 _mesa_glsl_error(&loc
, state
,
8226 "redeclaration of gl_PerVertex can only "
8227 "include built-in variables");
8228 } else if (declared_var
->data
.how_declared
== ir_var_declared_normally
) {
8229 _mesa_glsl_error(&loc
, state
,
8230 "`%s' has already been redeclared",
8231 declared_var
->name
);
8233 declared_var
->data
.how_declared
= ir_var_declared_in_block
;
8234 declared_var
->reinit_interface_type(block_type
);
8239 if (state
->symbols
->get_variable(var
->name
) != NULL
)
8240 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
8242 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
8243 * The UBO declaration itself doesn't get an ir_variable unless it
8244 * has an instance name. This is ugly.
8246 if (this->layout
.flags
.q
.explicit_binding
) {
8247 apply_explicit_binding(state
, &loc
, var
,
8248 var
->get_interface_type(), &this->layout
);
8251 if (var
->type
->is_unsized_array()) {
8252 if (var
->is_in_shader_storage_block() &&
8253 is_unsized_array_last_element(var
)) {
8254 var
->data
.from_ssbo_unsized_array
= true;
8256 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
8258 * "If an array is declared as the last member of a shader storage
8259 * block and the size is not specified at compile-time, it is
8260 * sized at run-time. In all other cases, arrays are sized only
8263 * In desktop GLSL it is allowed to have unsized-arrays that are
8264 * not last, as long as we can determine that they are implicitly
8267 if (state
->es_shader
) {
8268 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
8269 "definition: only last member of a shader "
8270 "storage block can be defined as unsized "
8271 "array", fields
[i
].name
);
8276 state
->symbols
->add_variable(var
);
8277 instructions
->push_tail(var
);
8280 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
8281 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
8283 * It is also a compilation error ... to redeclare a built-in
8284 * block and then use a member from that built-in block that was
8285 * not included in the redeclaration.
8287 * This appears to be a clarification to the behaviour established
8288 * for gl_PerVertex by GLSL 1.50, therefore we implement this
8289 * behaviour regardless of GLSL version.
8291 * To prevent the shader from using a member that was not included in
8292 * the redeclaration, we disable any ir_variables that are still
8293 * associated with the old declaration of gl_PerVertex (since we've
8294 * already updated all of the variables contained in the new
8295 * gl_PerVertex to point to it).
8297 * As a side effect this will prevent
8298 * validate_intrastage_interface_blocks() from getting confused and
8299 * thinking there are conflicting definitions of gl_PerVertex in the
8302 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8303 ir_variable
*const var
= node
->as_variable();
8305 var
->get_interface_type() == earlier_per_vertex
&&
8306 var
->data
.mode
== var_mode
) {
8307 if (var
->data
.how_declared
== ir_var_declared_normally
) {
8308 _mesa_glsl_error(&loc
, state
,
8309 "redeclaration of gl_PerVertex cannot "
8310 "follow a redeclaration of `%s'",
8313 state
->symbols
->disable_variable(var
->name
);
8325 ast_tcs_output_layout::hir(exec_list
*instructions
,
8326 struct _mesa_glsl_parse_state
*state
)
8328 YYLTYPE loc
= this->get_location();
8330 unsigned num_vertices
;
8331 if (!state
->out_qualifier
->vertices
->
8332 process_qualifier_constant(state
, "vertices", &num_vertices
,
8334 /* return here to stop cascading incorrect error messages */
8338 /* If any shader outputs occurred before this declaration and specified an
8339 * array size, make sure the size they specified is consistent with the
8342 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8343 _mesa_glsl_error(&loc
, state
,
8344 "this tessellation control shader output layout "
8345 "specifies %u vertices, but a previous output "
8346 "is declared with size %u",
8347 num_vertices
, state
->tcs_output_size
);
8351 state
->tcs_output_vertices_specified
= true;
8353 /* If any shader outputs occurred before this declaration and did not
8354 * specify an array size, their size is determined now.
8356 foreach_in_list (ir_instruction
, node
, instructions
) {
8357 ir_variable
*var
= node
->as_variable();
8358 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8361 /* Note: Not all tessellation control shader output are arrays. */
8362 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8365 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8366 _mesa_glsl_error(&loc
, state
,
8367 "this tessellation control shader output layout "
8368 "specifies %u vertices, but an access to element "
8369 "%u of output `%s' already exists", num_vertices
,
8370 var
->data
.max_array_access
, var
->name
);
8372 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8382 ast_gs_input_layout::hir(exec_list
*instructions
,
8383 struct _mesa_glsl_parse_state
*state
)
8385 YYLTYPE loc
= this->get_location();
8387 /* Should have been prevented by the parser. */
8388 assert(!state
->gs_input_prim_type_specified
8389 || state
->in_qualifier
->prim_type
== this->prim_type
);
8391 /* If any shader inputs occurred before this declaration and specified an
8392 * array size, make sure the size they specified is consistent with the
8395 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8396 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8397 _mesa_glsl_error(&loc
, state
,
8398 "this geometry shader input layout implies %u vertices"
8399 " per primitive, but a previous input is declared"
8400 " with size %u", num_vertices
, state
->gs_input_size
);
8404 state
->gs_input_prim_type_specified
= true;
8406 /* If any shader inputs occurred before this declaration and did not
8407 * specify an array size, their size is determined now.
8409 foreach_in_list(ir_instruction
, node
, instructions
) {
8410 ir_variable
*var
= node
->as_variable();
8411 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8414 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8418 if (var
->type
->is_unsized_array()) {
8419 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8420 _mesa_glsl_error(&loc
, state
,
8421 "this geometry shader input layout implies %u"
8422 " vertices, but an access to element %u of input"
8423 " `%s' already exists", num_vertices
,
8424 var
->data
.max_array_access
, var
->name
);
8426 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8437 ast_cs_input_layout::hir(exec_list
*instructions
,
8438 struct _mesa_glsl_parse_state
*state
)
8440 YYLTYPE loc
= this->get_location();
8442 /* From the ARB_compute_shader specification:
8444 * If the local size of the shader in any dimension is greater
8445 * than the maximum size supported by the implementation for that
8446 * dimension, a compile-time error results.
8448 * It is not clear from the spec how the error should be reported if
8449 * the total size of the work group exceeds
8450 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8451 * report it at compile time as well.
8453 GLuint64 total_invocations
= 1;
8454 unsigned qual_local_size
[3];
8455 for (int i
= 0; i
< 3; i
++) {
8457 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8459 /* Infer a local_size of 1 for unspecified dimensions */
8460 if (this->local_size
[i
] == NULL
) {
8461 qual_local_size
[i
] = 1;
8462 } else if (!this->local_size
[i
]->
8463 process_qualifier_constant(state
, local_size_str
,
8464 &qual_local_size
[i
], false)) {
8465 ralloc_free(local_size_str
);
8468 ralloc_free(local_size_str
);
8470 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8471 _mesa_glsl_error(&loc
, state
,
8472 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8474 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8477 total_invocations
*= qual_local_size
[i
];
8478 if (total_invocations
>
8479 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8480 _mesa_glsl_error(&loc
, state
,
8481 "product of local_sizes exceeds "
8482 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8483 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8488 /* If any compute input layout declaration preceded this one, make sure it
8489 * was consistent with this one.
8491 if (state
->cs_input_local_size_specified
) {
8492 for (int i
= 0; i
< 3; i
++) {
8493 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8494 _mesa_glsl_error(&loc
, state
,
8495 "compute shader input layout does not match"
8496 " previous declaration");
8502 /* The ARB_compute_variable_group_size spec says:
8504 * If a compute shader including a *local_size_variable* qualifier also
8505 * declares a fixed local group size using the *local_size_x*,
8506 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8509 if (state
->cs_input_local_size_variable_specified
) {
8510 _mesa_glsl_error(&loc
, state
,
8511 "compute shader can't include both a variable and a "
8512 "fixed local group size");
8516 state
->cs_input_local_size_specified
= true;
8517 for (int i
= 0; i
< 3; i
++)
8518 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8520 /* We may now declare the built-in constant gl_WorkGroupSize (see
8521 * builtin_variable_generator::generate_constants() for why we didn't
8522 * declare it earlier).
8524 ir_variable
*var
= new(state
->symbols
)
8525 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8526 var
->data
.how_declared
= ir_var_declared_implicitly
;
8527 var
->data
.read_only
= true;
8528 instructions
->push_tail(var
);
8529 state
->symbols
->add_variable(var
);
8530 ir_constant_data data
;
8531 memset(&data
, 0, sizeof(data
));
8532 for (int i
= 0; i
< 3; i
++)
8533 data
.u
[i
] = qual_local_size
[i
];
8534 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8535 var
->constant_initializer
=
8536 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8537 var
->data
.has_initializer
= true;
8544 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8545 exec_list
*instructions
)
8547 bool gl_FragColor_assigned
= false;
8548 bool gl_FragData_assigned
= false;
8549 bool gl_FragSecondaryColor_assigned
= false;
8550 bool gl_FragSecondaryData_assigned
= false;
8551 bool user_defined_fs_output_assigned
= false;
8552 ir_variable
*user_defined_fs_output
= NULL
;
8554 /* It would be nice to have proper location information. */
8556 memset(&loc
, 0, sizeof(loc
));
8558 foreach_in_list(ir_instruction
, node
, instructions
) {
8559 ir_variable
*var
= node
->as_variable();
8561 if (!var
|| !var
->data
.assigned
)
8564 if (strcmp(var
->name
, "gl_FragColor") == 0)
8565 gl_FragColor_assigned
= true;
8566 else if (strcmp(var
->name
, "gl_FragData") == 0)
8567 gl_FragData_assigned
= true;
8568 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8569 gl_FragSecondaryColor_assigned
= true;
8570 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8571 gl_FragSecondaryData_assigned
= true;
8572 else if (!is_gl_identifier(var
->name
)) {
8573 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8574 var
->data
.mode
== ir_var_shader_out
) {
8575 user_defined_fs_output_assigned
= true;
8576 user_defined_fs_output
= var
;
8581 /* From the GLSL 1.30 spec:
8583 * "If a shader statically assigns a value to gl_FragColor, it
8584 * may not assign a value to any element of gl_FragData. If a
8585 * shader statically writes a value to any element of
8586 * gl_FragData, it may not assign a value to
8587 * gl_FragColor. That is, a shader may assign values to either
8588 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8589 * linked together must also consistently write just one of
8590 * these variables. Similarly, if user declared output
8591 * variables are in use (statically assigned to), then the
8592 * built-in variables gl_FragColor and gl_FragData may not be
8593 * assigned to. These incorrect usages all generate compile
8596 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8597 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8598 "`gl_FragColor' and `gl_FragData'");
8599 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8600 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8601 "`gl_FragColor' and `%s'",
8602 user_defined_fs_output
->name
);
8603 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8604 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8605 "`gl_FragSecondaryColorEXT' and"
8606 " `gl_FragSecondaryDataEXT'");
8607 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8608 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8609 "`gl_FragColor' and"
8610 " `gl_FragSecondaryDataEXT'");
8611 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8612 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8614 " `gl_FragSecondaryColorEXT'");
8615 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8616 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8617 "`gl_FragData' and `%s'",
8618 user_defined_fs_output
->name
);
8621 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8622 !state
->EXT_blend_func_extended_enable
) {
8623 _mesa_glsl_error(&loc
, state
,
8624 "Dual source blending requires EXT_blend_func_extended");
8630 remove_per_vertex_blocks(exec_list
*instructions
,
8631 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8633 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8634 * if it exists in this shader type.
8636 const glsl_type
*per_vertex
= NULL
;
8638 case ir_var_shader_in
:
8639 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8640 per_vertex
= gl_in
->get_interface_type();
8642 case ir_var_shader_out
:
8643 if (ir_variable
*gl_Position
=
8644 state
->symbols
->get_variable("gl_Position")) {
8645 per_vertex
= gl_Position
->get_interface_type();
8649 assert(!"Unexpected mode");
8653 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8654 * need to do anything.
8656 if (per_vertex
== NULL
)
8659 /* If the interface block is used by the shader, then we don't need to do
8662 interface_block_usage_visitor
v(mode
, per_vertex
);
8663 v
.run(instructions
);
8664 if (v
.usage_found())
8667 /* Remove any ir_variable declarations that refer to the interface block
8670 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8671 ir_variable
*const var
= node
->as_variable();
8672 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8673 var
->data
.mode
== mode
) {
8674 state
->symbols
->disable_variable(var
->name
);