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. */
1340 ir_binop_less
, /* This is correct. See the ast_greater case below. */
1341 ir_binop_gequal
, /* This is correct. See the ast_lequal case below. */
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 /* Like NIR, GLSL IR does not have opcodes for > or <=. Instead, swap
1491 * the arguments and use < or >=.
1493 if (this->oper
== ast_greater
|| this->oper
== ast_lequal
) {
1494 ir_rvalue
*const tmp
= op
[0];
1499 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1501 error_emitted
= type
->is_error();
1506 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1507 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1509 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1511 * "The equality operators equal (==), and not equal (!=)
1512 * operate on all types. They result in a scalar Boolean. If
1513 * the operand types do not match, then there must be a
1514 * conversion from Section 4.1.10 "Implicit Conversions"
1515 * applied to one operand that can make them match, in which
1516 * case this conversion is done."
1519 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1520 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1521 "no operation `%1$s' exists that takes a left-hand "
1522 "operand of type 'void' or a right operand of type "
1523 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1524 error_emitted
= true;
1525 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1526 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1527 || (op
[0]->type
!= op
[1]->type
)) {
1528 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1529 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1530 error_emitted
= true;
1531 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1532 !state
->check_version(120, 300, &loc
,
1533 "array comparisons forbidden")) {
1534 error_emitted
= true;
1535 } else if ((op
[0]->type
->contains_subroutine() ||
1536 op
[1]->type
->contains_subroutine())) {
1537 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1538 error_emitted
= true;
1539 } else if ((op
[0]->type
->contains_opaque() ||
1540 op
[1]->type
->contains_opaque())) {
1541 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1542 error_emitted
= true;
1545 if (error_emitted
) {
1546 result
= new(ctx
) ir_constant(false);
1548 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1549 assert(result
->type
== glsl_type::bool_type
);
1556 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1557 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1558 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1559 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1561 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1565 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1567 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1568 error_emitted
= true;
1571 if (!op
[0]->type
->is_integer_32_64()) {
1572 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1573 error_emitted
= true;
1576 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1577 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1580 case ast_logic_and
: {
1581 exec_list rhs_instructions
;
1582 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1583 "LHS", &error_emitted
);
1584 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1585 "RHS", &error_emitted
);
1587 if (rhs_instructions
.is_empty()) {
1588 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1589 type
= result
->type
;
1591 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1594 instructions
->push_tail(tmp
);
1596 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1597 instructions
->push_tail(stmt
);
1599 stmt
->then_instructions
.append_list(&rhs_instructions
);
1600 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1601 ir_assignment
*const then_assign
=
1602 new(ctx
) ir_assignment(then_deref
, op
[1]);
1603 stmt
->then_instructions
.push_tail(then_assign
);
1605 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1606 ir_assignment
*const else_assign
=
1607 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1608 stmt
->else_instructions
.push_tail(else_assign
);
1610 result
= new(ctx
) ir_dereference_variable(tmp
);
1616 case ast_logic_or
: {
1617 exec_list rhs_instructions
;
1618 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1619 "LHS", &error_emitted
);
1620 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1621 "RHS", &error_emitted
);
1623 if (rhs_instructions
.is_empty()) {
1624 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1625 type
= result
->type
;
1627 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1630 instructions
->push_tail(tmp
);
1632 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1633 instructions
->push_tail(stmt
);
1635 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1636 ir_assignment
*const then_assign
=
1637 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1638 stmt
->then_instructions
.push_tail(then_assign
);
1640 stmt
->else_instructions
.append_list(&rhs_instructions
);
1641 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1642 ir_assignment
*const else_assign
=
1643 new(ctx
) ir_assignment(else_deref
, op
[1]);
1644 stmt
->else_instructions
.push_tail(else_assign
);
1646 result
= new(ctx
) ir_dereference_variable(tmp
);
1653 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1655 * "The logical binary operators and (&&), or ( | | ), and
1656 * exclusive or (^^). They operate only on two Boolean
1657 * expressions and result in a Boolean expression."
1659 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1661 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1664 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1669 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1670 "operand", &error_emitted
);
1672 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1676 case ast_mul_assign
:
1677 case ast_div_assign
:
1678 case ast_add_assign
:
1679 case ast_sub_assign
: {
1680 this->subexpressions
[0]->set_is_lhs(true);
1681 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1682 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1684 orig_type
= op
[0]->type
;
1685 type
= arithmetic_result_type(op
[0], op
[1],
1686 (this->oper
== ast_mul_assign
),
1689 if (type
!= orig_type
) {
1690 _mesa_glsl_error(& loc
, state
,
1691 "could not implicitly convert "
1692 "%s to %s", type
->name
, orig_type
->name
);
1693 type
= glsl_type::error_type
;
1696 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1700 do_assignment(instructions
, state
,
1701 this->subexpressions
[0]->non_lvalue_description
,
1702 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1703 &result
, needs_rvalue
, false,
1704 this->subexpressions
[0]->get_location());
1706 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1707 * explicitly test for this because none of the binary expression
1708 * operators allow array operands either.
1714 case ast_mod_assign
: {
1715 this->subexpressions
[0]->set_is_lhs(true);
1716 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1717 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1719 orig_type
= op
[0]->type
;
1720 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1722 if (type
!= orig_type
) {
1723 _mesa_glsl_error(& loc
, state
,
1724 "could not implicitly convert "
1725 "%s to %s", type
->name
, orig_type
->name
);
1726 type
= glsl_type::error_type
;
1729 assert(operations
[this->oper
] == ir_binop_mod
);
1731 ir_rvalue
*temp_rhs
;
1732 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1736 do_assignment(instructions
, state
,
1737 this->subexpressions
[0]->non_lvalue_description
,
1738 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1739 &result
, needs_rvalue
, false,
1740 this->subexpressions
[0]->get_location());
1745 case ast_rs_assign
: {
1746 this->subexpressions
[0]->set_is_lhs(true);
1747 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1748 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1749 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1751 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1752 type
, op
[0], op
[1]);
1754 do_assignment(instructions
, state
,
1755 this->subexpressions
[0]->non_lvalue_description
,
1756 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1757 &result
, needs_rvalue
, false,
1758 this->subexpressions
[0]->get_location());
1762 case ast_and_assign
:
1763 case ast_xor_assign
:
1764 case ast_or_assign
: {
1765 this->subexpressions
[0]->set_is_lhs(true);
1766 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1767 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1769 orig_type
= op
[0]->type
;
1770 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1772 if (type
!= orig_type
) {
1773 _mesa_glsl_error(& loc
, state
,
1774 "could not implicitly convert "
1775 "%s to %s", type
->name
, orig_type
->name
);
1776 type
= glsl_type::error_type
;
1779 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1780 type
, op
[0], op
[1]);
1782 do_assignment(instructions
, state
,
1783 this->subexpressions
[0]->non_lvalue_description
,
1784 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1785 &result
, needs_rvalue
, false,
1786 this->subexpressions
[0]->get_location());
1790 case ast_conditional
: {
1791 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1793 * "The ternary selection operator (?:). It operates on three
1794 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1795 * first expression, which must result in a scalar Boolean."
1797 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1798 "condition", &error_emitted
);
1800 /* The :? operator is implemented by generating an anonymous temporary
1801 * followed by an if-statement. The last instruction in each branch of
1802 * the if-statement assigns a value to the anonymous temporary. This
1803 * temporary is the r-value of the expression.
1805 exec_list then_instructions
;
1806 exec_list else_instructions
;
1808 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1809 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1811 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1813 * "The second and third expressions can be any type, as
1814 * long their types match, or there is a conversion in
1815 * Section 4.1.10 "Implicit Conversions" that can be applied
1816 * to one of the expressions to make their types match. This
1817 * resulting matching type is the type of the entire
1820 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1821 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1822 || (op
[1]->type
!= op
[2]->type
)) {
1823 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1825 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1826 "operator must have matching types");
1827 error_emitted
= true;
1828 type
= glsl_type::error_type
;
1833 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1835 * "The second and third expressions must be the same type, but can
1836 * be of any type other than an array."
1838 if (type
->is_array() &&
1839 !state
->check_version(120, 300, &loc
,
1840 "second and third operands of ?: operator "
1841 "cannot be arrays")) {
1842 error_emitted
= true;
1845 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1847 * "Except for array indexing, structure member selection, and
1848 * parentheses, opaque variables are not allowed to be operands in
1849 * expressions; such use results in a compile-time error."
1851 if (type
->contains_opaque()) {
1852 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1853 "of the ?: operator");
1854 error_emitted
= true;
1857 ir_constant
*cond_val
= op
[0]->constant_expression_value(ctx
);
1859 if (then_instructions
.is_empty()
1860 && else_instructions
.is_empty()
1861 && cond_val
!= NULL
) {
1862 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1864 /* The copy to conditional_tmp reads the whole array. */
1865 if (type
->is_array()) {
1866 mark_whole_array_access(op
[1]);
1867 mark_whole_array_access(op
[2]);
1870 ir_variable
*const tmp
=
1871 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1872 instructions
->push_tail(tmp
);
1874 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1875 instructions
->push_tail(stmt
);
1877 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1878 ir_dereference
*const then_deref
=
1879 new(ctx
) ir_dereference_variable(tmp
);
1880 ir_assignment
*const then_assign
=
1881 new(ctx
) ir_assignment(then_deref
, op
[1]);
1882 stmt
->then_instructions
.push_tail(then_assign
);
1884 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1885 ir_dereference
*const else_deref
=
1886 new(ctx
) ir_dereference_variable(tmp
);
1887 ir_assignment
*const else_assign
=
1888 new(ctx
) ir_assignment(else_deref
, op
[2]);
1889 stmt
->else_instructions
.push_tail(else_assign
);
1891 result
= new(ctx
) ir_dereference_variable(tmp
);
1898 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1899 ? "pre-increment operation" : "pre-decrement operation";
1901 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1902 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1904 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1906 ir_rvalue
*temp_rhs
;
1907 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1911 do_assignment(instructions
, state
,
1912 this->subexpressions
[0]->non_lvalue_description
,
1913 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1914 &result
, needs_rvalue
, false,
1915 this->subexpressions
[0]->get_location());
1920 case ast_post_dec
: {
1921 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1922 ? "post-increment operation" : "post-decrement operation";
1923 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1924 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1926 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1928 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1930 ir_rvalue
*temp_rhs
;
1931 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1934 /* Get a temporary of a copy of the lvalue before it's modified.
1935 * This may get thrown away later.
1937 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1939 ir_rvalue
*junk_rvalue
;
1941 do_assignment(instructions
, state
,
1942 this->subexpressions
[0]->non_lvalue_description
,
1943 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1944 &junk_rvalue
, false, false,
1945 this->subexpressions
[0]->get_location());
1950 case ast_field_selection
:
1951 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1954 case ast_array_index
: {
1955 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1957 /* Getting if an array is being used uninitialized is beyond what we get
1958 * from ir_value.data.assigned. Setting is_lhs as true would force to
1959 * not raise a uninitialized warning when using an array
1961 subexpressions
[0]->set_is_lhs(true);
1962 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1963 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1965 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1968 if (result
->type
->is_error())
1969 error_emitted
= true;
1974 case ast_unsized_array_dim
:
1975 assert(!"ast_unsized_array_dim: Should never get here.");
1978 case ast_function_call
:
1979 /* Should *NEVER* get here. ast_function_call should always be handled
1980 * by ast_function_expression::hir.
1985 case ast_identifier
: {
1986 /* ast_identifier can appear several places in a full abstract syntax
1987 * tree. This particular use must be at location specified in the grammar
1988 * as 'variable_identifier'.
1991 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1994 /* the identifier might be a subroutine name */
1996 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
1997 var
= state
->symbols
->get_variable(sub_name
);
1998 ralloc_free(sub_name
);
2002 var
->data
.used
= true;
2003 result
= new(ctx
) ir_dereference_variable(var
);
2005 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
2007 && result
->variable_referenced()->data
.assigned
!= true
2008 && !is_gl_identifier(var
->name
)) {
2009 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
2010 this->primary_expression
.identifier
);
2013 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
2014 this->primary_expression
.identifier
);
2016 result
= ir_rvalue::error_value(ctx
);
2017 error_emitted
= true;
2022 case ast_int_constant
:
2023 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
2026 case ast_uint_constant
:
2027 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
2030 case ast_float_constant
:
2031 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
2034 case ast_bool_constant
:
2035 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2038 case ast_double_constant
:
2039 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2042 case ast_uint64_constant
:
2043 result
= new(ctx
) ir_constant(this->primary_expression
.uint64_constant
);
2046 case ast_int64_constant
:
2047 result
= new(ctx
) ir_constant(this->primary_expression
.int64_constant
);
2050 case ast_sequence
: {
2051 /* It should not be possible to generate a sequence in the AST without
2052 * any expressions in it.
2054 assert(!this->expressions
.is_empty());
2056 /* The r-value of a sequence is the last expression in the sequence. If
2057 * the other expressions in the sequence do not have side-effects (and
2058 * therefore add instructions to the instruction list), they get dropped
2061 exec_node
*previous_tail
= NULL
;
2062 YYLTYPE previous_operand_loc
= loc
;
2064 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2065 /* If one of the operands of comma operator does not generate any
2066 * code, we want to emit a warning. At each pass through the loop
2067 * previous_tail will point to the last instruction in the stream
2068 * *before* processing the previous operand. Naturally,
2069 * instructions->get_tail_raw() will point to the last instruction in
2070 * the stream *after* processing the previous operand. If the two
2071 * pointers match, then the previous operand had no effect.
2073 * The warning behavior here differs slightly from GCC. GCC will
2074 * only emit a warning if none of the left-hand operands have an
2075 * effect. However, it will emit a warning for each. I believe that
2076 * there are some cases in C (especially with GCC extensions) where
2077 * it is useful to have an intermediate step in a sequence have no
2078 * effect, but I don't think these cases exist in GLSL. Either way,
2079 * it would be a giant hassle to replicate that behavior.
2081 if (previous_tail
== instructions
->get_tail_raw()) {
2082 _mesa_glsl_warning(&previous_operand_loc
, state
,
2083 "left-hand operand of comma expression has "
2087 /* The tail is directly accessed instead of using the get_tail()
2088 * method for performance reasons. get_tail() has extra code to
2089 * return NULL when the list is empty. We don't care about that
2090 * here, so using get_tail_raw() is fine.
2092 previous_tail
= instructions
->get_tail_raw();
2093 previous_operand_loc
= ast
->get_location();
2095 result
= ast
->hir(instructions
, state
);
2098 /* Any errors should have already been emitted in the loop above.
2100 error_emitted
= true;
2104 type
= NULL
; /* use result->type, not type. */
2105 assert(result
!= NULL
|| !needs_rvalue
);
2107 if (result
&& result
->type
->is_error() && !error_emitted
)
2108 _mesa_glsl_error(& loc
, state
, "type mismatch");
2114 ast_expression::has_sequence_subexpression() const
2116 switch (this->oper
) {
2125 return this->subexpressions
[0]->has_sequence_subexpression();
2147 case ast_array_index
:
2148 case ast_mul_assign
:
2149 case ast_div_assign
:
2150 case ast_add_assign
:
2151 case ast_sub_assign
:
2152 case ast_mod_assign
:
2155 case ast_and_assign
:
2156 case ast_xor_assign
:
2158 return this->subexpressions
[0]->has_sequence_subexpression() ||
2159 this->subexpressions
[1]->has_sequence_subexpression();
2161 case ast_conditional
:
2162 return this->subexpressions
[0]->has_sequence_subexpression() ||
2163 this->subexpressions
[1]->has_sequence_subexpression() ||
2164 this->subexpressions
[2]->has_sequence_subexpression();
2169 case ast_field_selection
:
2170 case ast_identifier
:
2171 case ast_int_constant
:
2172 case ast_uint_constant
:
2173 case ast_float_constant
:
2174 case ast_bool_constant
:
2175 case ast_double_constant
:
2176 case ast_int64_constant
:
2177 case ast_uint64_constant
:
2183 case ast_function_call
:
2184 unreachable("should be handled by ast_function_expression::hir");
2186 case ast_unsized_array_dim
:
2187 unreachable("ast_unsized_array_dim: Should never get here.");
2194 ast_expression_statement::hir(exec_list
*instructions
,
2195 struct _mesa_glsl_parse_state
*state
)
2197 /* It is possible to have expression statements that don't have an
2198 * expression. This is the solitary semicolon:
2200 * for (i = 0; i < 5; i++)
2203 * In this case the expression will be NULL. Test for NULL and don't do
2204 * anything in that case.
2206 if (expression
!= NULL
)
2207 expression
->hir_no_rvalue(instructions
, state
);
2209 /* Statements do not have r-values.
2216 ast_compound_statement::hir(exec_list
*instructions
,
2217 struct _mesa_glsl_parse_state
*state
)
2220 state
->symbols
->push_scope();
2222 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2223 ast
->hir(instructions
, state
);
2226 state
->symbols
->pop_scope();
2228 /* Compound statements do not have r-values.
2234 * Evaluate the given exec_node (which should be an ast_node representing
2235 * a single array dimension) and return its integer value.
2238 process_array_size(exec_node
*node
,
2239 struct _mesa_glsl_parse_state
*state
)
2241 void *mem_ctx
= state
;
2243 exec_list dummy_instructions
;
2245 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2248 * Dimensions other than the outermost dimension can by unsized if they
2249 * are immediately sized by a constructor or initializer.
2251 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2254 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2255 YYLTYPE loc
= array_size
->get_location();
2258 _mesa_glsl_error(& loc
, state
,
2259 "array size could not be resolved");
2263 if (!ir
->type
->is_integer()) {
2264 _mesa_glsl_error(& loc
, state
,
2265 "array size must be integer type");
2269 if (!ir
->type
->is_scalar()) {
2270 _mesa_glsl_error(& loc
, state
,
2271 "array size must be scalar type");
2275 ir_constant
*const size
= ir
->constant_expression_value(mem_ctx
);
2277 (state
->is_version(120, 300) &&
2278 array_size
->has_sequence_subexpression())) {
2279 _mesa_glsl_error(& loc
, state
, "array size must be a "
2280 "constant valued expression");
2284 if (size
->value
.i
[0] <= 0) {
2285 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2289 assert(size
->type
== ir
->type
);
2291 /* If the array size is const (and we've verified that
2292 * it is) then no instructions should have been emitted
2293 * when we converted it to HIR. If they were emitted,
2294 * then either the array size isn't const after all, or
2295 * we are emitting unnecessary instructions.
2297 assert(dummy_instructions
.is_empty());
2299 return size
->value
.u
[0];
2302 static const glsl_type
*
2303 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2304 ast_array_specifier
*array_specifier
,
2305 struct _mesa_glsl_parse_state
*state
)
2307 const glsl_type
*array_type
= base
;
2309 if (array_specifier
!= NULL
) {
2310 if (base
->is_array()) {
2312 /* From page 19 (page 25) of the GLSL 1.20 spec:
2314 * "Only one-dimensional arrays may be declared."
2316 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2317 return glsl_type::error_type
;
2321 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2322 !node
->is_head_sentinel(); node
= node
->prev
) {
2323 unsigned array_size
= process_array_size(node
, state
);
2324 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2332 precision_qualifier_allowed(const glsl_type
*type
)
2334 /* Precision qualifiers apply to floating point, integer and opaque
2337 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2338 * "Any floating point or any integer declaration can have the type
2339 * preceded by one of these precision qualifiers [...] Literal
2340 * constants do not have precision qualifiers. Neither do Boolean
2343 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2346 * "Precision qualifiers are added for code portability with OpenGL
2347 * ES, not for functionality. They have the same syntax as in OpenGL
2350 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2352 * "uniform lowp sampler2D sampler;
2355 * lowp vec4 col = texture2D (sampler, coord);
2356 * // texture2D returns lowp"
2358 * From this, we infer that GLSL 1.30 (and later) should allow precision
2359 * qualifiers on sampler types just like float and integer types.
2361 const glsl_type
*const t
= type
->without_array();
2363 return (t
->is_float() || t
->is_integer() || t
->contains_opaque()) &&
2368 ast_type_specifier::glsl_type(const char **name
,
2369 struct _mesa_glsl_parse_state
*state
) const
2371 const struct glsl_type
*type
;
2373 if (this->type
!= NULL
)
2376 type
= structure
->type
;
2378 type
= state
->symbols
->get_type(this->type_name
);
2379 *name
= this->type_name
;
2381 YYLTYPE loc
= this->get_location();
2382 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2388 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2390 * "The precision statement
2392 * precision precision-qualifier type;
2394 * can be used to establish a default precision qualifier. The type field can
2395 * be either int or float or any of the sampler types, (...) If type is float,
2396 * the directive applies to non-precision-qualified floating point type
2397 * (scalar, vector, and matrix) declarations. If type is int, the directive
2398 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2399 * and unsigned) declarations."
2401 * We use the symbol table to keep the values of the default precisions for
2402 * each 'type' in each scope and we use the 'type' string from the precision
2403 * statement as key in the symbol table. When we want to retrieve the default
2404 * precision associated with a given glsl_type we need to know the type string
2405 * associated with it. This is what this function returns.
2408 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2410 switch (type
->base_type
) {
2411 case GLSL_TYPE_FLOAT
:
2413 case GLSL_TYPE_UINT
:
2416 case GLSL_TYPE_ATOMIC_UINT
:
2417 return "atomic_uint";
2418 case GLSL_TYPE_IMAGE
:
2420 case GLSL_TYPE_SAMPLER
: {
2421 const unsigned type_idx
=
2422 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2423 const unsigned offset
= type
->is_sampler() ? 0 : 4;
2424 assert(type_idx
< 4);
2425 switch (type
->sampled_type
) {
2426 case GLSL_TYPE_FLOAT
:
2427 switch (type
->sampler_dimensionality
) {
2428 case GLSL_SAMPLER_DIM_1D
: {
2429 assert(type
->is_sampler());
2430 static const char *const names
[4] = {
2431 "sampler1D", "sampler1DArray",
2432 "sampler1DShadow", "sampler1DArrayShadow"
2434 return names
[type_idx
];
2436 case GLSL_SAMPLER_DIM_2D
: {
2437 static const char *const names
[8] = {
2438 "sampler2D", "sampler2DArray",
2439 "sampler2DShadow", "sampler2DArrayShadow",
2440 "image2D", "image2DArray", NULL
, NULL
2442 return names
[offset
+ type_idx
];
2444 case GLSL_SAMPLER_DIM_3D
: {
2445 static const char *const names
[8] = {
2446 "sampler3D", NULL
, NULL
, NULL
,
2447 "image3D", NULL
, NULL
, NULL
2449 return names
[offset
+ type_idx
];
2451 case GLSL_SAMPLER_DIM_CUBE
: {
2452 static const char *const names
[8] = {
2453 "samplerCube", "samplerCubeArray",
2454 "samplerCubeShadow", "samplerCubeArrayShadow",
2455 "imageCube", NULL
, NULL
, NULL
2457 return names
[offset
+ type_idx
];
2459 case GLSL_SAMPLER_DIM_MS
: {
2460 assert(type
->is_sampler());
2461 static const char *const names
[4] = {
2462 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2464 return names
[type_idx
];
2466 case GLSL_SAMPLER_DIM_RECT
: {
2467 assert(type
->is_sampler());
2468 static const char *const names
[4] = {
2469 "samplerRect", NULL
, "samplerRectShadow", NULL
2471 return names
[type_idx
];
2473 case GLSL_SAMPLER_DIM_BUF
: {
2474 static const char *const names
[8] = {
2475 "samplerBuffer", NULL
, NULL
, NULL
,
2476 "imageBuffer", NULL
, NULL
, NULL
2478 return names
[offset
+ type_idx
];
2480 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2481 assert(type
->is_sampler());
2482 static const char *const names
[4] = {
2483 "samplerExternalOES", NULL
, NULL
, NULL
2485 return names
[type_idx
];
2488 unreachable("Unsupported sampler/image dimensionality");
2489 } /* sampler/image float dimensionality */
2492 switch (type
->sampler_dimensionality
) {
2493 case GLSL_SAMPLER_DIM_1D
: {
2494 assert(type
->is_sampler());
2495 static const char *const names
[4] = {
2496 "isampler1D", "isampler1DArray", NULL
, NULL
2498 return names
[type_idx
];
2500 case GLSL_SAMPLER_DIM_2D
: {
2501 static const char *const names
[8] = {
2502 "isampler2D", "isampler2DArray", NULL
, NULL
,
2503 "iimage2D", "iimage2DArray", NULL
, NULL
2505 return names
[offset
+ type_idx
];
2507 case GLSL_SAMPLER_DIM_3D
: {
2508 static const char *const names
[8] = {
2509 "isampler3D", NULL
, NULL
, NULL
,
2510 "iimage3D", NULL
, NULL
, NULL
2512 return names
[offset
+ type_idx
];
2514 case GLSL_SAMPLER_DIM_CUBE
: {
2515 static const char *const names
[8] = {
2516 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2517 "iimageCube", NULL
, NULL
, NULL
2519 return names
[offset
+ type_idx
];
2521 case GLSL_SAMPLER_DIM_MS
: {
2522 assert(type
->is_sampler());
2523 static const char *const names
[4] = {
2524 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2526 return names
[type_idx
];
2528 case GLSL_SAMPLER_DIM_RECT
: {
2529 assert(type
->is_sampler());
2530 static const char *const names
[4] = {
2531 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2533 return names
[type_idx
];
2535 case GLSL_SAMPLER_DIM_BUF
: {
2536 static const char *const names
[8] = {
2537 "isamplerBuffer", NULL
, NULL
, NULL
,
2538 "iimageBuffer", NULL
, NULL
, NULL
2540 return names
[offset
+ type_idx
];
2543 unreachable("Unsupported isampler/iimage dimensionality");
2544 } /* sampler/image int dimensionality */
2546 case GLSL_TYPE_UINT
:
2547 switch (type
->sampler_dimensionality
) {
2548 case GLSL_SAMPLER_DIM_1D
: {
2549 assert(type
->is_sampler());
2550 static const char *const names
[4] = {
2551 "usampler1D", "usampler1DArray", NULL
, NULL
2553 return names
[type_idx
];
2555 case GLSL_SAMPLER_DIM_2D
: {
2556 static const char *const names
[8] = {
2557 "usampler2D", "usampler2DArray", NULL
, NULL
,
2558 "uimage2D", "uimage2DArray", NULL
, NULL
2560 return names
[offset
+ type_idx
];
2562 case GLSL_SAMPLER_DIM_3D
: {
2563 static const char *const names
[8] = {
2564 "usampler3D", NULL
, NULL
, NULL
,
2565 "uimage3D", NULL
, NULL
, NULL
2567 return names
[offset
+ type_idx
];
2569 case GLSL_SAMPLER_DIM_CUBE
: {
2570 static const char *const names
[8] = {
2571 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2572 "uimageCube", NULL
, NULL
, NULL
2574 return names
[offset
+ type_idx
];
2576 case GLSL_SAMPLER_DIM_MS
: {
2577 assert(type
->is_sampler());
2578 static const char *const names
[4] = {
2579 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2581 return names
[type_idx
];
2583 case GLSL_SAMPLER_DIM_RECT
: {
2584 assert(type
->is_sampler());
2585 static const char *const names
[4] = {
2586 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2588 return names
[type_idx
];
2590 case GLSL_SAMPLER_DIM_BUF
: {
2591 static const char *const names
[8] = {
2592 "usamplerBuffer", NULL
, NULL
, NULL
,
2593 "uimageBuffer", NULL
, NULL
, NULL
2595 return names
[offset
+ type_idx
];
2598 unreachable("Unsupported usampler/uimage dimensionality");
2599 } /* sampler/image uint dimensionality */
2602 unreachable("Unsupported sampler/image type");
2603 } /* sampler/image type */
2605 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2608 unreachable("Unsupported type");
2613 select_gles_precision(unsigned qual_precision
,
2614 const glsl_type
*type
,
2615 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2617 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2618 * In GLES we take the precision from the type qualifier if present,
2619 * otherwise, if the type of the variable allows precision qualifiers at
2620 * all, we look for the default precision qualifier for that type in the
2623 assert(state
->es_shader
);
2625 unsigned precision
= GLSL_PRECISION_NONE
;
2626 if (qual_precision
) {
2627 precision
= qual_precision
;
2628 } else if (precision_qualifier_allowed(type
)) {
2629 const char *type_name
=
2630 get_type_name_for_precision_qualifier(type
->without_array());
2631 assert(type_name
!= NULL
);
2634 state
->symbols
->get_default_precision_qualifier(type_name
);
2635 if (precision
== ast_precision_none
) {
2636 _mesa_glsl_error(loc
, state
,
2637 "No precision specified in this scope for type `%s'",
2643 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2645 * "The default precision of all atomic types is highp. It is an error to
2646 * declare an atomic type with a different precision or to specify the
2647 * default precision for an atomic type to be lowp or mediump."
2649 if (type
->is_atomic_uint() && precision
!= ast_precision_high
) {
2650 _mesa_glsl_error(loc
, state
,
2651 "atomic_uint can only have highp precision qualifier");
2658 ast_fully_specified_type::glsl_type(const char **name
,
2659 struct _mesa_glsl_parse_state
*state
) const
2661 return this->specifier
->glsl_type(name
, state
);
2665 * Determine whether a toplevel variable declaration declares a varying. This
2666 * function operates by examining the variable's mode and the shader target,
2667 * so it correctly identifies linkage variables regardless of whether they are
2668 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2670 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2671 * this function will produce undefined results.
2674 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2677 case MESA_SHADER_VERTEX
:
2678 return var
->data
.mode
== ir_var_shader_out
;
2679 case MESA_SHADER_FRAGMENT
:
2680 return var
->data
.mode
== ir_var_shader_in
;
2682 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2687 is_allowed_invariant(ir_variable
*var
, struct _mesa_glsl_parse_state
*state
)
2689 if (is_varying_var(var
, state
->stage
))
2692 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
2693 * "Only variables output from a vertex shader can be candidates
2696 if (!state
->is_version(130, 0))
2700 * Later specs remove this language - so allowed invariant
2701 * on fragment shader outputs as well.
2703 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
2704 var
->data
.mode
== ir_var_shader_out
)
2710 * Matrix layout qualifiers are only allowed on certain types
2713 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2715 const glsl_type
*type
,
2718 if (var
&& !var
->is_in_buffer_block()) {
2719 /* Layout qualifiers may only apply to interface blocks and fields in
2722 _mesa_glsl_error(loc
, state
,
2723 "uniform block layout qualifiers row_major and "
2724 "column_major may not be applied to variables "
2725 "outside of uniform blocks");
2726 } else if (!type
->without_array()->is_matrix()) {
2727 /* The OpenGL ES 3.0 conformance tests did not originally allow
2728 * matrix layout qualifiers on non-matrices. However, the OpenGL
2729 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2730 * amended to specifically allow these layouts on all types. Emit
2731 * a warning so that people know their code may not be portable.
2733 _mesa_glsl_warning(loc
, state
,
2734 "uniform block layout qualifiers row_major and "
2735 "column_major applied to non-matrix types may "
2736 "be rejected by older compilers");
2741 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2742 struct _mesa_glsl_parse_state
*state
,
2743 unsigned xfb_buffer
) {
2744 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2745 _mesa_glsl_error(loc
, state
,
2746 "invalid xfb_buffer specified %d is larger than "
2747 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2749 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2756 /* From the ARB_enhanced_layouts spec:
2758 * "Variables and block members qualified with *xfb_offset* can be
2759 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2760 * The offset must be a multiple of the size of the first component of
2761 * the first qualified variable or block member, or a compile-time error
2762 * results. Further, if applied to an aggregate containing a double,
2763 * the offset must also be a multiple of 8, and the space taken in the
2764 * buffer will be a multiple of 8.
2767 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2768 struct _mesa_glsl_parse_state
*state
,
2769 int xfb_offset
, const glsl_type
*type
,
2770 unsigned component_size
) {
2771 const glsl_type
*t_without_array
= type
->without_array();
2773 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2774 _mesa_glsl_error(loc
, state
,
2775 "xfb_offset can't be used with unsized arrays.");
2779 /* Make sure nested structs don't contain unsized arrays, and validate
2780 * any xfb_offsets on interface members.
2782 if (t_without_array
->is_record() || t_without_array
->is_interface())
2783 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2784 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2786 /* When the interface block doesn't have an xfb_offset qualifier then
2787 * we apply the component size rules at the member level.
2789 if (xfb_offset
== -1)
2790 component_size
= member_t
->contains_double() ? 8 : 4;
2792 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2793 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2797 /* Nested structs or interface block without offset may not have had an
2798 * offset applied yet so return.
2800 if (xfb_offset
== -1) {
2804 if (xfb_offset
% component_size
) {
2805 _mesa_glsl_error(loc
, state
,
2806 "invalid qualifier xfb_offset=%d must be a multiple "
2807 "of the first component size of the first qualified "
2808 "variable or block member. Or double if an aggregate "
2809 "that contains a double (%d).",
2810 xfb_offset
, component_size
);
2818 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2821 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2822 _mesa_glsl_error(loc
, state
,
2823 "invalid stream specified %d is larger than "
2824 "MAX_VERTEX_STREAMS - 1 (%d).",
2825 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2833 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2836 const glsl_type
*type
,
2837 const ast_type_qualifier
*qual
)
2839 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2840 _mesa_glsl_error(loc
, state
,
2841 "the \"binding\" qualifier only applies to uniforms and "
2842 "shader storage buffer objects");
2846 unsigned qual_binding
;
2847 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2852 const struct gl_context
*const ctx
= state
->ctx
;
2853 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2854 unsigned max_index
= qual_binding
+ elements
- 1;
2855 const glsl_type
*base_type
= type
->without_array();
2857 if (base_type
->is_interface()) {
2858 /* UBOs. From page 60 of the GLSL 4.20 specification:
2859 * "If the binding point for any uniform block instance is less than zero,
2860 * or greater than or equal to the implementation-dependent maximum
2861 * number of uniform buffer bindings, a compilation error will occur.
2862 * When the binding identifier is used with a uniform block instanced as
2863 * an array of size N, all elements of the array from binding through
2864 * binding + N – 1 must be within this range."
2866 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2868 if (qual
->flags
.q
.uniform
&&
2869 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2870 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2871 "the maximum number of UBO binding points (%d)",
2872 qual_binding
, elements
,
2873 ctx
->Const
.MaxUniformBufferBindings
);
2877 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2878 * "If the binding point for any uniform or shader storage block instance
2879 * is less than zero, or greater than or equal to the
2880 * implementation-dependent maximum number of uniform buffer bindings, a
2881 * compile-time error will occur. When the binding identifier is used
2882 * with a uniform or shader storage block instanced as an array of size
2883 * N, all elements of the array from binding through binding + N – 1 must
2884 * be within this range."
2886 if (qual
->flags
.q
.buffer
&&
2887 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2888 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2889 "the maximum number of SSBO binding points (%d)",
2890 qual_binding
, elements
,
2891 ctx
->Const
.MaxShaderStorageBufferBindings
);
2894 } else if (base_type
->is_sampler()) {
2895 /* Samplers. From page 63 of the GLSL 4.20 specification:
2896 * "If the binding is less than zero, or greater than or equal to the
2897 * implementation-dependent maximum supported number of units, a
2898 * compilation error will occur. When the binding identifier is used
2899 * with an array of size N, all elements of the array from binding
2900 * through binding + N - 1 must be within this range."
2902 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2904 if (max_index
>= limit
) {
2905 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2906 "exceeds the maximum number of texture image units "
2907 "(%u)", qual_binding
, elements
, limit
);
2911 } else if (base_type
->contains_atomic()) {
2912 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2913 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2914 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2915 "maximum number of atomic counter buffer bindings "
2916 "(%u)", qual_binding
,
2917 ctx
->Const
.MaxAtomicBufferBindings
);
2921 } else if ((state
->is_version(420, 310) ||
2922 state
->ARB_shading_language_420pack_enable
) &&
2923 base_type
->is_image()) {
2924 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2925 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2926 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2927 "maximum number of image units (%d)", max_index
,
2928 ctx
->Const
.MaxImageUnits
);
2933 _mesa_glsl_error(loc
, state
,
2934 "the \"binding\" qualifier only applies to uniform "
2935 "blocks, storage blocks, opaque variables, or arrays "
2940 var
->data
.explicit_binding
= true;
2941 var
->data
.binding
= qual_binding
;
2947 validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state
*state
,
2949 const glsl_interp_mode interpolation
,
2950 const struct glsl_type
*var_type
,
2951 ir_variable_mode mode
)
2953 if (state
->stage
!= MESA_SHADER_FRAGMENT
||
2954 interpolation
== INTERP_MODE_FLAT
||
2955 mode
!= ir_var_shader_in
)
2958 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2959 * so must integer vertex outputs.
2961 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2962 * "Fragment shader inputs that are signed or unsigned integers or
2963 * integer vectors must be qualified with the interpolation qualifier
2966 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2967 * "Fragment shader inputs that are, or contain, signed or unsigned
2968 * integers or integer vectors must be qualified with the
2969 * interpolation qualifier flat."
2971 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2972 * "Vertex shader outputs that are, or contain, signed or unsigned
2973 * integers or integer vectors must be qualified with the
2974 * interpolation qualifier flat."
2976 * Note that prior to GLSL 1.50, this requirement applied to vertex
2977 * outputs rather than fragment inputs. That creates problems in the
2978 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2979 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2980 * apply the restriction to both vertex outputs and fragment inputs.
2982 * Note also that the desktop GLSL specs are missing the text "or
2983 * contain"; this is presumably an oversight, since there is no
2984 * reasonable way to interpolate a fragment shader input that contains
2985 * an integer. See Khronos bug #15671.
2987 if (state
->is_version(130, 300)
2988 && var_type
->contains_integer()) {
2989 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
2990 "an integer, then it must be qualified with 'flat'");
2993 /* Double fragment inputs must be qualified with 'flat'.
2995 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
2996 * "This extension does not support interpolation of double-precision
2997 * values; doubles used as fragment shader inputs must be qualified as
3000 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
3001 * "Fragment shader inputs that are signed or unsigned integers, integer
3002 * vectors, or any double-precision floating-point type must be
3003 * qualified with the interpolation qualifier flat."
3005 * Note that the GLSL specs are missing the text "or contain"; this is
3006 * presumably an oversight. See Khronos bug #15671.
3008 * The 'double' type does not exist in GLSL ES so far.
3010 if (state
->has_double()
3011 && var_type
->contains_double()) {
3012 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3013 "a double, then it must be qualified with 'flat'");
3016 /* Bindless sampler/image fragment inputs must be qualified with 'flat'.
3018 * From section 4.3.4 of the ARB_bindless_texture spec:
3020 * "(modify last paragraph, p. 35, allowing samplers and images as
3021 * fragment shader inputs) ... Fragment inputs can only be signed and
3022 * unsigned integers and integer vectors, floating point scalars,
3023 * floating-point vectors, matrices, sampler and image types, or arrays
3024 * or structures of these. Fragment shader inputs that are signed or
3025 * unsigned integers, integer vectors, or any double-precision floating-
3026 * point type, or any sampler or image type must be qualified with the
3027 * interpolation qualifier "flat"."
3029 if (state
->has_bindless()
3030 && (var_type
->contains_sampler() || var_type
->contains_image())) {
3031 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3032 "a bindless sampler (or image), then it must be "
3033 "qualified with 'flat'");
3038 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
3040 const glsl_interp_mode interpolation
,
3041 const struct ast_type_qualifier
*qual
,
3042 const struct glsl_type
*var_type
,
3043 ir_variable_mode mode
)
3045 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
3046 * not to vertex shader inputs nor fragment shader outputs.
3048 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3049 * "Outputs from a vertex shader (out) and inputs to a fragment
3050 * shader (in) can be further qualified with one or more of these
3051 * interpolation qualifiers"
3053 * "These interpolation qualifiers may only precede the qualifiers in,
3054 * centroid in, out, or centroid out in a declaration. They do not apply
3055 * to the deprecated storage qualifiers varying or centroid
3056 * varying. They also do not apply to inputs into a vertex shader or
3057 * outputs from a fragment shader."
3059 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
3060 * "Outputs from a shader (out) and inputs to a shader (in) can be
3061 * further qualified with one of these interpolation qualifiers."
3063 * "These interpolation qualifiers may only precede the qualifiers
3064 * in, centroid in, out, or centroid out in a declaration. They do
3065 * not apply to inputs into a vertex shader or outputs from a
3068 if (state
->is_version(130, 300)
3069 && interpolation
!= INTERP_MODE_NONE
) {
3070 const char *i
= interpolation_string(interpolation
);
3071 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
3072 _mesa_glsl_error(loc
, state
,
3073 "interpolation qualifier `%s' can only be applied to "
3074 "shader inputs or outputs.", i
);
3076 switch (state
->stage
) {
3077 case MESA_SHADER_VERTEX
:
3078 if (mode
== ir_var_shader_in
) {
3079 _mesa_glsl_error(loc
, state
,
3080 "interpolation qualifier '%s' cannot be applied to "
3081 "vertex shader inputs", i
);
3084 case MESA_SHADER_FRAGMENT
:
3085 if (mode
== ir_var_shader_out
) {
3086 _mesa_glsl_error(loc
, state
,
3087 "interpolation qualifier '%s' cannot be applied to "
3088 "fragment shader outputs", i
);
3096 /* Interpolation qualifiers cannot be applied to 'centroid' and
3097 * 'centroid varying'.
3099 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3100 * "interpolation qualifiers may only precede the qualifiers in,
3101 * centroid in, out, or centroid out in a declaration. They do not apply
3102 * to the deprecated storage qualifiers varying or centroid varying."
3104 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3106 if (state
->is_version(130, 0)
3107 && interpolation
!= INTERP_MODE_NONE
3108 && qual
->flags
.q
.varying
) {
3110 const char *i
= interpolation_string(interpolation
);
3112 if (qual
->flags
.q
.centroid
)
3113 s
= "centroid varying";
3117 _mesa_glsl_error(loc
, state
,
3118 "qualifier '%s' cannot be applied to the "
3119 "deprecated storage qualifier '%s'", i
, s
);
3122 validate_fragment_flat_interpolation_input(state
, loc
, interpolation
,
3126 static glsl_interp_mode
3127 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3128 const struct glsl_type
*var_type
,
3129 ir_variable_mode mode
,
3130 struct _mesa_glsl_parse_state
*state
,
3133 glsl_interp_mode interpolation
;
3134 if (qual
->flags
.q
.flat
)
3135 interpolation
= INTERP_MODE_FLAT
;
3136 else if (qual
->flags
.q
.noperspective
)
3137 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3138 else if (qual
->flags
.q
.smooth
)
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
&& var
->data
.mode
== ir_var_shader_out
)
4081 var
->data
.invariant
= true;
4083 var
->data
.interpolation
=
4084 interpret_interpolation_qualifier(qual
, var
->type
,
4085 (ir_variable_mode
) var
->data
.mode
,
4088 /* Does the declaration use the deprecated 'attribute' or 'varying'
4091 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
4092 || qual
->flags
.q
.varying
;
4095 /* Validate auxiliary storage qualifiers */
4097 /* From section 4.3.4 of the GLSL 1.30 spec:
4098 * "It is an error to use centroid in in a vertex shader."
4100 * From section 4.3.4 of the GLSL ES 3.00 spec:
4101 * "It is an error to use centroid in or interpolation qualifiers in
4102 * a vertex shader input."
4105 /* Section 4.3.6 of the GLSL 1.30 specification states:
4106 * "It is an error to use centroid out in a fragment shader."
4108 * The GL_ARB_shading_language_420pack extension specification states:
4109 * "It is an error to use auxiliary storage qualifiers or interpolation
4110 * qualifiers on an output in a fragment shader."
4112 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
4113 _mesa_glsl_error(loc
, state
,
4114 "sample qualifier may only be used on `in` or `out` "
4115 "variables between shader stages");
4117 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
4118 _mesa_glsl_error(loc
, state
,
4119 "centroid qualifier may only be used with `in', "
4120 "`out' or `varying' variables between shader stages");
4123 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
4124 _mesa_glsl_error(loc
, state
,
4125 "the shared storage qualifiers can only be used with "
4129 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
4133 * Get the variable that is being redeclared by this declaration or if it
4134 * does not exist, the current declared variable.
4136 * Semantic checks to verify the validity of the redeclaration are also
4137 * performed. If semantic checks fail, compilation error will be emitted via
4138 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
4141 * A pointer to an existing variable in the current scope if the declaration
4142 * is a redeclaration, current variable otherwise. \c is_declared boolean
4143 * will return \c true if the declaration is a redeclaration, \c false
4146 static ir_variable
*
4147 get_variable_being_redeclared(ir_variable
**var_ptr
, YYLTYPE loc
,
4148 struct _mesa_glsl_parse_state
*state
,
4149 bool allow_all_redeclarations
,
4150 bool *is_redeclaration
)
4152 ir_variable
*var
= *var_ptr
;
4154 /* Check if this declaration is actually a re-declaration, either to
4155 * resize an array or add qualifiers to an existing variable.
4157 * This is allowed for variables in the current scope, or when at
4158 * global scope (for built-ins in the implicit outer scope).
4160 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
4161 if (earlier
== NULL
||
4162 (state
->current_function
!= NULL
&&
4163 !state
->symbols
->name_declared_this_scope(var
->name
))) {
4164 *is_redeclaration
= false;
4168 *is_redeclaration
= true;
4170 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4172 * "It is legal to declare an array without a size and then
4173 * later re-declare the same name as an array of the same
4174 * type and specify a size."
4176 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4177 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4178 /* FINISHME: This doesn't match the qualifiers on the two
4179 * FINISHME: declarations. It's not 100% clear whether this is
4180 * FINISHME: required or not.
4183 const int size
= var
->type
->array_size();
4184 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4185 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4186 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4188 earlier
->data
.max_array_access
);
4191 earlier
->type
= var
->type
;
4195 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4196 state
->is_version(150, 0))
4197 && strcmp(var
->name
, "gl_FragCoord") == 0
4198 && earlier
->type
== var
->type
4199 && var
->data
.mode
== ir_var_shader_in
) {
4200 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4203 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
4204 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
4206 /* According to section 4.3.7 of the GLSL 1.30 spec,
4207 * the following built-in varaibles can be redeclared with an
4208 * interpolation qualifier:
4211 * * gl_FrontSecondaryColor
4212 * * gl_BackSecondaryColor
4214 * * gl_SecondaryColor
4216 } else if (state
->is_version(130, 0)
4217 && (strcmp(var
->name
, "gl_FrontColor") == 0
4218 || strcmp(var
->name
, "gl_BackColor") == 0
4219 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4220 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4221 || strcmp(var
->name
, "gl_Color") == 0
4222 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
4223 && earlier
->type
== var
->type
4224 && earlier
->data
.mode
== var
->data
.mode
) {
4225 earlier
->data
.interpolation
= var
->data
.interpolation
;
4227 /* Layout qualifiers for gl_FragDepth. */
4228 } else if ((state
->is_version(420, 0) ||
4229 state
->AMD_conservative_depth_enable
||
4230 state
->ARB_conservative_depth_enable
)
4231 && strcmp(var
->name
, "gl_FragDepth") == 0
4232 && earlier
->type
== var
->type
4233 && earlier
->data
.mode
== var
->data
.mode
) {
4235 /** From the AMD_conservative_depth spec:
4236 * Within any shader, the first redeclarations of gl_FragDepth
4237 * must appear before any use of gl_FragDepth.
4239 if (earlier
->data
.used
) {
4240 _mesa_glsl_error(&loc
, state
,
4241 "the first redeclaration of gl_FragDepth "
4242 "must appear before any use of gl_FragDepth");
4245 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4246 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4247 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4248 _mesa_glsl_error(&loc
, state
,
4249 "gl_FragDepth: depth layout is declared here "
4250 "as '%s, but it was previously declared as "
4252 depth_layout_string(var
->data
.depth_layout
),
4253 depth_layout_string(earlier
->data
.depth_layout
));
4256 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4258 } else if (state
->has_framebuffer_fetch() &&
4259 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4260 var
->type
== earlier
->type
&&
4261 var
->data
.mode
== ir_var_auto
) {
4262 /* According to the EXT_shader_framebuffer_fetch spec:
4264 * "By default, gl_LastFragData is declared with the mediump precision
4265 * qualifier. This can be changed by redeclaring the corresponding
4266 * variables with the desired precision qualifier."
4268 earlier
->data
.precision
= var
->data
.precision
;
4270 } else if (earlier
->data
.how_declared
== ir_var_declared_implicitly
&&
4271 state
->allow_builtin_variable_redeclaration
) {
4272 /* Allow verbatim redeclarations of built-in variables. Not explicitly
4273 * valid, but some applications do it.
4275 if (earlier
->data
.mode
!= var
->data
.mode
&&
4276 !(earlier
->data
.mode
== ir_var_system_value
&&
4277 var
->data
.mode
== ir_var_shader_in
)) {
4278 _mesa_glsl_error(&loc
, state
,
4279 "redeclaration of `%s' with incorrect qualifiers",
4281 } else if (earlier
->type
!= var
->type
) {
4282 _mesa_glsl_error(&loc
, state
,
4283 "redeclaration of `%s' has incorrect type",
4286 } else if (allow_all_redeclarations
) {
4287 if (earlier
->data
.mode
!= var
->data
.mode
) {
4288 _mesa_glsl_error(&loc
, state
,
4289 "redeclaration of `%s' with incorrect qualifiers",
4291 } else if (earlier
->type
!= var
->type
) {
4292 _mesa_glsl_error(&loc
, state
,
4293 "redeclaration of `%s' has incorrect type",
4297 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4304 * Generate the IR for an initializer in a variable declaration
4307 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4308 ast_fully_specified_type
*type
,
4309 exec_list
*initializer_instructions
,
4310 struct _mesa_glsl_parse_state
*state
)
4312 void *mem_ctx
= state
;
4313 ir_rvalue
*result
= NULL
;
4315 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4317 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4319 * "All uniform variables are read-only and are initialized either
4320 * directly by an application via API commands, or indirectly by
4323 if (var
->data
.mode
== ir_var_uniform
) {
4324 state
->check_version(120, 0, &initializer_loc
,
4325 "cannot initialize uniform %s",
4329 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4331 * "Buffer variables cannot have initializers."
4333 if (var
->data
.mode
== ir_var_shader_storage
) {
4334 _mesa_glsl_error(&initializer_loc
, state
,
4335 "cannot initialize buffer variable %s",
4339 /* From section 4.1.7 of the GLSL 4.40 spec:
4341 * "Opaque variables [...] are initialized only through the
4342 * OpenGL API; they cannot be declared with an initializer in a
4345 * From section 4.1.7 of the ARB_bindless_texture spec:
4347 * "Samplers may be declared as shader inputs and outputs, as uniform
4348 * variables, as temporary variables, and as function parameters."
4350 * From section 4.1.X of the ARB_bindless_texture spec:
4352 * "Images may be declared as shader inputs and outputs, as uniform
4353 * variables, as temporary variables, and as function parameters."
4355 if (var
->type
->contains_atomic() ||
4356 (!state
->has_bindless() && var
->type
->contains_opaque())) {
4357 _mesa_glsl_error(&initializer_loc
, state
,
4358 "cannot initialize %s variable %s",
4359 var
->name
, state
->has_bindless() ? "atomic" : "opaque");
4362 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4363 _mesa_glsl_error(&initializer_loc
, state
,
4364 "cannot initialize %s shader input / %s %s",
4365 _mesa_shader_stage_to_string(state
->stage
),
4366 (state
->stage
== MESA_SHADER_VERTEX
)
4367 ? "attribute" : "varying",
4371 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4372 _mesa_glsl_error(&initializer_loc
, state
,
4373 "cannot initialize %s shader output %s",
4374 _mesa_shader_stage_to_string(state
->stage
),
4378 /* If the initializer is an ast_aggregate_initializer, recursively store
4379 * type information from the LHS into it, so that its hir() function can do
4382 if (decl
->initializer
->oper
== ast_aggregate
)
4383 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4385 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4386 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4388 /* Calculate the constant value if this is a const or uniform
4391 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4393 * "Declarations of globals without a storage qualifier, or with
4394 * just the const qualifier, may include initializers, in which case
4395 * they will be initialized before the first line of main() is
4396 * executed. Such initializers must be a constant expression."
4398 * The same section of the GLSL ES 3.00.4 spec has similar language.
4400 if (type
->qualifier
.flags
.q
.constant
4401 || type
->qualifier
.flags
.q
.uniform
4402 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4403 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4405 if (new_rhs
!= NULL
) {
4408 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4411 * "A constant expression is one of
4415 * - an expression formed by an operator on operands that are
4416 * all constant expressions, including getting an element of
4417 * a constant array, or a field of a constant structure, or
4418 * components of a constant vector. However, the sequence
4419 * operator ( , ) and the assignment operators ( =, +=, ...)
4420 * are not included in the operators that can create a
4421 * constant expression."
4423 * Section 12.43 (Sequence operator and constant expressions) says:
4425 * "Should the following construct be allowed?
4429 * The expression within the brackets uses the sequence operator
4430 * (',') and returns the integer 3 so the construct is declaring
4431 * a single-dimensional array of size 3. In some languages, the
4432 * construct declares a two-dimensional array. It would be
4433 * preferable to make this construct illegal to avoid confusion.
4435 * One possibility is to change the definition of the sequence
4436 * operator so that it does not return a constant-expression and
4437 * hence cannot be used to declare an array size.
4439 * RESOLUTION: The result of a sequence operator is not a
4440 * constant-expression."
4442 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4443 * contains language almost identical to the section 4.3.3 in the
4444 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4447 ir_constant
*constant_value
=
4448 rhs
->constant_expression_value(mem_ctx
);
4450 if (!constant_value
||
4451 (state
->is_version(430, 300) &&
4452 decl
->initializer
->has_sequence_subexpression())) {
4453 const char *const variable_mode
=
4454 (type
->qualifier
.flags
.q
.constant
)
4456 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4458 /* If ARB_shading_language_420pack is enabled, initializers of
4459 * const-qualified local variables do not have to be constant
4460 * expressions. Const-qualified global variables must still be
4461 * initialized with constant expressions.
4463 if (!state
->has_420pack()
4464 || state
->current_function
== NULL
) {
4465 _mesa_glsl_error(& initializer_loc
, state
,
4466 "initializer of %s variable `%s' must be a "
4467 "constant expression",
4470 if (var
->type
->is_numeric()) {
4471 /* Reduce cascading errors. */
4472 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4473 ? ir_constant::zero(state
, var
->type
) : NULL
;
4477 rhs
= constant_value
;
4478 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4479 ? constant_value
: NULL
;
4482 if (var
->type
->is_numeric()) {
4483 /* Reduce cascading errors. */
4484 rhs
= var
->constant_value
= type
->qualifier
.flags
.q
.constant
4485 ? ir_constant::zero(state
, var
->type
) : NULL
;
4490 if (rhs
&& !rhs
->type
->is_error()) {
4491 bool temp
= var
->data
.read_only
;
4492 if (type
->qualifier
.flags
.q
.constant
)
4493 var
->data
.read_only
= false;
4495 /* Never emit code to initialize a uniform.
4497 const glsl_type
*initializer_type
;
4498 if (!type
->qualifier
.flags
.q
.uniform
) {
4499 do_assignment(initializer_instructions
, state
,
4504 type
->get_location());
4505 initializer_type
= result
->type
;
4507 initializer_type
= rhs
->type
;
4509 var
->constant_initializer
= rhs
->constant_expression_value(mem_ctx
);
4510 var
->data
.has_initializer
= true;
4512 /* If the declared variable is an unsized array, it must inherrit
4513 * its full type from the initializer. A declaration such as
4515 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4519 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4521 * The assignment generated in the if-statement (below) will also
4522 * automatically handle this case for non-uniforms.
4524 * If the declared variable is not an array, the types must
4525 * already match exactly. As a result, the type assignment
4526 * here can be done unconditionally. For non-uniforms the call
4527 * to do_assignment can change the type of the initializer (via
4528 * the implicit conversion rules). For uniforms the initializer
4529 * must be a constant expression, and the type of that expression
4530 * was validated above.
4532 var
->type
= initializer_type
;
4534 var
->data
.read_only
= temp
;
4541 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4542 YYLTYPE loc
, ir_variable
*var
,
4543 unsigned num_vertices
,
4545 const char *var_category
)
4547 if (var
->type
->is_unsized_array()) {
4548 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4550 * All geometry shader input unsized array declarations will be
4551 * sized by an earlier input layout qualifier, when present, as per
4552 * the following table.
4554 * Followed by a table mapping each allowed input layout qualifier to
4555 * the corresponding input length.
4557 * Similarly for tessellation control shader outputs.
4559 if (num_vertices
!= 0)
4560 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4563 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4564 * includes the following examples of compile-time errors:
4566 * // code sequence within one shader...
4567 * in vec4 Color1[]; // size unknown
4568 * ...Color1.length()...// illegal, length() unknown
4569 * in vec4 Color2[2]; // size is 2
4570 * ...Color1.length()...// illegal, Color1 still has no size
4571 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4572 * layout(lines) in; // legal, input size is 2, matching
4573 * in vec4 Color4[3]; // illegal, contradicts layout
4576 * To detect the case illustrated by Color3, we verify that the size of
4577 * an explicitly-sized array matches the size of any previously declared
4578 * explicitly-sized array. To detect the case illustrated by Color4, we
4579 * verify that the size of an explicitly-sized array is consistent with
4580 * any previously declared input layout.
4582 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4583 _mesa_glsl_error(&loc
, state
,
4584 "%s size contradicts previously declared layout "
4585 "(size is %u, but layout requires a size of %u)",
4586 var_category
, var
->type
->length
, num_vertices
);
4587 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4588 _mesa_glsl_error(&loc
, state
,
4589 "%s sizes are inconsistent (size is %u, but a "
4590 "previous declaration has size %u)",
4591 var_category
, var
->type
->length
, *size
);
4593 *size
= var
->type
->length
;
4599 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4600 YYLTYPE loc
, ir_variable
*var
)
4602 unsigned num_vertices
= 0;
4604 if (state
->tcs_output_vertices_specified
) {
4605 if (!state
->out_qualifier
->vertices
->
4606 process_qualifier_constant(state
, "vertices",
4607 &num_vertices
, false)) {
4611 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4612 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4613 "GL_MAX_PATCH_VERTICES", num_vertices
);
4618 if (!var
->type
->is_array() && !var
->data
.patch
) {
4619 _mesa_glsl_error(&loc
, state
,
4620 "tessellation control shader outputs must be arrays");
4622 /* To avoid cascading failures, short circuit the checks below. */
4626 if (var
->data
.patch
)
4629 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4630 &state
->tcs_output_size
,
4631 "tessellation control shader output");
4635 * Do additional processing necessary for tessellation control/evaluation shader
4636 * input declarations. This covers both interface block arrays and bare input
4640 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4641 YYLTYPE loc
, ir_variable
*var
)
4643 if (!var
->type
->is_array() && !var
->data
.patch
) {
4644 _mesa_glsl_error(&loc
, state
,
4645 "per-vertex tessellation shader inputs must be arrays");
4646 /* Avoid cascading failures. */
4650 if (var
->data
.patch
)
4653 /* The ARB_tessellation_shader spec says:
4655 * "Declaring an array size is optional. If no size is specified, it
4656 * will be taken from the implementation-dependent maximum patch size
4657 * (gl_MaxPatchVertices). If a size is specified, it must match the
4658 * maximum patch size; otherwise, a compile or link error will occur."
4660 * This text appears twice, once for TCS inputs, and again for TES inputs.
4662 if (var
->type
->is_unsized_array()) {
4663 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4664 state
->Const
.MaxPatchVertices
);
4665 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4666 _mesa_glsl_error(&loc
, state
,
4667 "per-vertex tessellation shader input arrays must be "
4668 "sized to gl_MaxPatchVertices (%d).",
4669 state
->Const
.MaxPatchVertices
);
4675 * Do additional processing necessary for geometry shader input declarations
4676 * (this covers both interface blocks arrays and bare input variables).
4679 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4680 YYLTYPE loc
, ir_variable
*var
)
4682 unsigned num_vertices
= 0;
4684 if (state
->gs_input_prim_type_specified
) {
4685 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4688 /* Geometry shader input variables must be arrays. Caller should have
4689 * reported an error for this.
4691 if (!var
->type
->is_array()) {
4692 assert(state
->error
);
4694 /* To avoid cascading failures, short circuit the checks below. */
4698 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4699 &state
->gs_input_size
,
4700 "geometry shader input");
4704 validate_identifier(const char *identifier
, YYLTYPE loc
,
4705 struct _mesa_glsl_parse_state
*state
)
4707 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4709 * "Identifiers starting with "gl_" are reserved for use by
4710 * OpenGL, and may not be declared in a shader as either a
4711 * variable or a function."
4713 if (is_gl_identifier(identifier
)) {
4714 _mesa_glsl_error(&loc
, state
,
4715 "identifier `%s' uses reserved `gl_' prefix",
4717 } else if (strstr(identifier
, "__")) {
4718 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4721 * "In addition, all identifiers containing two
4722 * consecutive underscores (__) are reserved as
4723 * possible future keywords."
4725 * The intention is that names containing __ are reserved for internal
4726 * use by the implementation, and names prefixed with GL_ are reserved
4727 * for use by Khronos. Names simply containing __ are dangerous to use,
4728 * but should be allowed.
4730 * A future version of the GLSL specification will clarify this.
4732 _mesa_glsl_warning(&loc
, state
,
4733 "identifier `%s' uses reserved `__' string",
4739 ast_declarator_list::hir(exec_list
*instructions
,
4740 struct _mesa_glsl_parse_state
*state
)
4743 const struct glsl_type
*decl_type
;
4744 const char *type_name
= NULL
;
4745 ir_rvalue
*result
= NULL
;
4746 YYLTYPE loc
= this->get_location();
4748 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4750 * "To ensure that a particular output variable is invariant, it is
4751 * necessary to use the invariant qualifier. It can either be used to
4752 * qualify a previously declared variable as being invariant
4754 * invariant gl_Position; // make existing gl_Position be invariant"
4756 * In these cases the parser will set the 'invariant' flag in the declarator
4757 * list, and the type will be NULL.
4759 if (this->invariant
) {
4760 assert(this->type
== NULL
);
4762 if (state
->current_function
!= NULL
) {
4763 _mesa_glsl_error(& loc
, state
,
4764 "all uses of `invariant' keyword must be at global "
4768 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4769 assert(decl
->array_specifier
== NULL
);
4770 assert(decl
->initializer
== NULL
);
4772 ir_variable
*const earlier
=
4773 state
->symbols
->get_variable(decl
->identifier
);
4774 if (earlier
== NULL
) {
4775 _mesa_glsl_error(& loc
, state
,
4776 "undeclared variable `%s' cannot be marked "
4777 "invariant", decl
->identifier
);
4778 } else if (!is_allowed_invariant(earlier
, state
)) {
4779 _mesa_glsl_error(&loc
, state
,
4780 "`%s' cannot be marked invariant; interfaces between "
4781 "shader stages only.", decl
->identifier
);
4782 } else if (earlier
->data
.used
) {
4783 _mesa_glsl_error(& loc
, state
,
4784 "variable `%s' may not be redeclared "
4785 "`invariant' after being used",
4788 earlier
->data
.invariant
= true;
4792 /* Invariant redeclarations do not have r-values.
4797 if (this->precise
) {
4798 assert(this->type
== NULL
);
4800 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4801 assert(decl
->array_specifier
== NULL
);
4802 assert(decl
->initializer
== NULL
);
4804 ir_variable
*const earlier
=
4805 state
->symbols
->get_variable(decl
->identifier
);
4806 if (earlier
== NULL
) {
4807 _mesa_glsl_error(& loc
, state
,
4808 "undeclared variable `%s' cannot be marked "
4809 "precise", decl
->identifier
);
4810 } else if (state
->current_function
!= NULL
&&
4811 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4812 /* Note: we have to check if we're in a function, since
4813 * builtins are treated as having come from another scope.
4815 _mesa_glsl_error(& loc
, state
,
4816 "variable `%s' from an outer scope may not be "
4817 "redeclared `precise' in this scope",
4819 } else if (earlier
->data
.used
) {
4820 _mesa_glsl_error(& loc
, state
,
4821 "variable `%s' may not be redeclared "
4822 "`precise' after being used",
4825 earlier
->data
.precise
= true;
4829 /* Precise redeclarations do not have r-values either. */
4833 assert(this->type
!= NULL
);
4834 assert(!this->invariant
);
4835 assert(!this->precise
);
4837 /* The type specifier may contain a structure definition. Process that
4838 * before any of the variable declarations.
4840 (void) this->type
->specifier
->hir(instructions
, state
);
4842 decl_type
= this->type
->glsl_type(& type_name
, state
);
4844 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4845 * "Buffer variables may only be declared inside interface blocks
4846 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4847 * shader storage blocks. It is a compile-time error to declare buffer
4848 * variables at global scope (outside a block)."
4850 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4851 _mesa_glsl_error(&loc
, state
,
4852 "buffer variables cannot be declared outside "
4853 "interface blocks");
4856 /* An offset-qualified atomic counter declaration sets the default
4857 * offset for the next declaration within the same atomic counter
4860 if (decl_type
&& decl_type
->contains_atomic()) {
4861 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4862 type
->qualifier
.flags
.q
.explicit_offset
) {
4863 unsigned qual_binding
;
4864 unsigned qual_offset
;
4865 if (process_qualifier_constant(state
, &loc
, "binding",
4866 type
->qualifier
.binding
,
4868 && process_qualifier_constant(state
, &loc
, "offset",
4869 type
->qualifier
.offset
,
4871 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4875 ast_type_qualifier allowed_atomic_qual_mask
;
4876 allowed_atomic_qual_mask
.flags
.i
= 0;
4877 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4878 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4879 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4881 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4882 "invalid layout qualifier for",
4886 if (this->declarations
.is_empty()) {
4887 /* If there is no structure involved in the program text, there are two
4888 * possible scenarios:
4890 * - The program text contained something like 'vec4;'. This is an
4891 * empty declaration. It is valid but weird. Emit a warning.
4893 * - The program text contained something like 'S;' and 'S' is not the
4894 * name of a known structure type. This is both invalid and weird.
4897 * - The program text contained something like 'mediump float;'
4898 * when the programmer probably meant 'precision mediump
4899 * float;' Emit a warning with a description of what they
4900 * probably meant to do.
4902 * Note that if decl_type is NULL and there is a structure involved,
4903 * there must have been some sort of error with the structure. In this
4904 * case we assume that an error was already generated on this line of
4905 * code for the structure. There is no need to generate an additional,
4908 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4911 if (decl_type
== NULL
) {
4912 _mesa_glsl_error(&loc
, state
,
4913 "invalid type `%s' in empty declaration",
4916 if (decl_type
->is_array()) {
4917 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4920 * "... any declaration that leaves the size undefined is
4921 * disallowed as this would add complexity and there are no
4924 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4925 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4926 "or implicitly defined");
4929 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4931 * "The combinations of types and qualifiers that cause
4932 * compile-time or link-time errors are the same whether or not
4933 * the declaration is empty."
4935 validate_array_dimensions(decl_type
, state
, &loc
);
4938 if (decl_type
->is_atomic_uint()) {
4939 /* Empty atomic counter declarations are allowed and useful
4940 * to set the default offset qualifier.
4943 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4944 if (this->type
->specifier
->structure
!= NULL
) {
4945 _mesa_glsl_error(&loc
, state
,
4946 "precision qualifiers can't be applied "
4949 static const char *const precision_names
[] = {
4956 _mesa_glsl_warning(&loc
, state
,
4957 "empty declaration with precision "
4958 "qualifier, to set the default precision, "
4959 "use `precision %s %s;'",
4960 precision_names
[this->type
->
4961 qualifier
.precision
],
4964 } else if (this->type
->specifier
->structure
== NULL
) {
4965 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4970 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4971 const struct glsl_type
*var_type
;
4973 const char *identifier
= decl
->identifier
;
4974 /* FINISHME: Emit a warning if a variable declaration shadows a
4975 * FINISHME: declaration at a higher scope.
4978 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4979 if (type_name
!= NULL
) {
4980 _mesa_glsl_error(& loc
, state
,
4981 "invalid type `%s' in declaration of `%s'",
4982 type_name
, decl
->identifier
);
4984 _mesa_glsl_error(& loc
, state
,
4985 "invalid type in declaration of `%s'",
4991 if (this->type
->qualifier
.is_subroutine_decl()) {
4995 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4997 _mesa_glsl_error(& loc
, state
,
4998 "invalid type in declaration of `%s'",
5000 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
5005 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
5008 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
5010 /* The 'varying in' and 'varying out' qualifiers can only be used with
5011 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
5014 if (this->type
->qualifier
.flags
.q
.varying
) {
5015 if (this->type
->qualifier
.flags
.q
.in
) {
5016 _mesa_glsl_error(& loc
, state
,
5017 "`varying in' qualifier in declaration of "
5018 "`%s' only valid for geometry shaders using "
5019 "ARB_geometry_shader4 or EXT_geometry_shader4",
5021 } else if (this->type
->qualifier
.flags
.q
.out
) {
5022 _mesa_glsl_error(& loc
, state
,
5023 "`varying out' qualifier in declaration of "
5024 "`%s' only valid for geometry shaders using "
5025 "ARB_geometry_shader4 or EXT_geometry_shader4",
5030 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
5032 * "Global variables can only use the qualifiers const,
5033 * attribute, uniform, or varying. Only one may be
5036 * Local variables can only use the qualifier const."
5038 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
5039 * any extension that adds the 'layout' keyword.
5041 if (!state
->is_version(130, 300)
5042 && !state
->has_explicit_attrib_location()
5043 && !state
->has_separate_shader_objects()
5044 && !state
->ARB_fragment_coord_conventions_enable
) {
5045 if (this->type
->qualifier
.flags
.q
.out
) {
5046 _mesa_glsl_error(& loc
, state
,
5047 "`out' qualifier in declaration of `%s' "
5048 "only valid for function parameters in %s",
5049 decl
->identifier
, state
->get_version_string());
5051 if (this->type
->qualifier
.flags
.q
.in
) {
5052 _mesa_glsl_error(& loc
, state
,
5053 "`in' qualifier in declaration of `%s' "
5054 "only valid for function parameters in %s",
5055 decl
->identifier
, state
->get_version_string());
5057 /* FINISHME: Test for other invalid qualifiers. */
5060 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
5062 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
5065 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
5066 && (var
->type
->is_numeric() || var
->type
->is_boolean())
5067 && state
->zero_init
) {
5068 const ir_constant_data data
= { { 0 } };
5069 var
->data
.has_initializer
= true;
5070 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
5073 if (this->type
->qualifier
.flags
.q
.invariant
) {
5074 if (!is_allowed_invariant(var
, state
)) {
5075 _mesa_glsl_error(&loc
, state
,
5076 "`%s' cannot be marked invariant; interfaces between "
5077 "shader stages only", var
->name
);
5081 if (state
->current_function
!= NULL
) {
5082 const char *mode
= NULL
;
5083 const char *extra
= "";
5085 /* There is no need to check for 'inout' here because the parser will
5086 * only allow that in function parameter lists.
5088 if (this->type
->qualifier
.flags
.q
.attribute
) {
5090 } else if (this->type
->qualifier
.is_subroutine_decl()) {
5091 mode
= "subroutine uniform";
5092 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
5094 } else if (this->type
->qualifier
.flags
.q
.varying
) {
5096 } else if (this->type
->qualifier
.flags
.q
.in
) {
5098 extra
= " or in function parameter list";
5099 } else if (this->type
->qualifier
.flags
.q
.out
) {
5101 extra
= " or in function parameter list";
5105 _mesa_glsl_error(& loc
, state
,
5106 "%s variable `%s' must be declared at "
5108 mode
, var
->name
, extra
);
5110 } else if (var
->data
.mode
== ir_var_shader_in
) {
5111 var
->data
.read_only
= true;
5113 if (state
->stage
== MESA_SHADER_VERTEX
) {
5114 bool error_emitted
= false;
5116 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
5118 * "Vertex shader inputs can only be float, floating-point
5119 * vectors, matrices, signed and unsigned integers and integer
5120 * vectors. Vertex shader inputs can also form arrays of these
5121 * types, but not structures."
5123 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
5125 * "Vertex shader inputs can only be float, floating-point
5126 * vectors, matrices, signed and unsigned integers and integer
5127 * vectors. They cannot be arrays or structures."
5129 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
5131 * "The attribute qualifier can be used only with float,
5132 * floating-point vectors, and matrices. Attribute variables
5133 * cannot be declared as arrays or structures."
5135 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
5137 * "Vertex shader inputs can only be float, floating-point
5138 * vectors, matrices, signed and unsigned integers and integer
5139 * vectors. Vertex shader inputs cannot be arrays or
5142 * From section 4.3.4 of the ARB_bindless_texture spec:
5144 * "(modify third paragraph of the section to allow sampler and
5145 * image types) ... Vertex shader inputs can only be float,
5146 * single-precision floating-point scalars, single-precision
5147 * floating-point vectors, matrices, signed and unsigned
5148 * integers and integer vectors, sampler and image types."
5150 const glsl_type
*check_type
= var
->type
->without_array();
5152 switch (check_type
->base_type
) {
5153 case GLSL_TYPE_FLOAT
:
5155 case GLSL_TYPE_UINT64
:
5156 case GLSL_TYPE_INT64
:
5158 case GLSL_TYPE_UINT
:
5160 if (state
->is_version(120, 300))
5162 case GLSL_TYPE_DOUBLE
:
5163 if (check_type
->is_double() && (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
5165 case GLSL_TYPE_SAMPLER
:
5166 if (check_type
->is_sampler() && state
->has_bindless())
5168 case GLSL_TYPE_IMAGE
:
5169 if (check_type
->is_image() && state
->has_bindless())
5173 _mesa_glsl_error(& loc
, state
,
5174 "vertex shader input / attribute cannot have "
5176 var
->type
->is_array() ? "array of " : "",
5178 error_emitted
= true;
5181 if (!error_emitted
&& var
->type
->is_array() &&
5182 !state
->check_version(150, 0, &loc
,
5183 "vertex shader input / attribute "
5184 "cannot have array type")) {
5185 error_emitted
= true;
5187 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
5188 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5190 * Geometry shader input variables get the per-vertex values
5191 * written out by vertex shader output variables of the same
5192 * names. Since a geometry shader operates on a set of
5193 * vertices, each input varying variable (or input block, see
5194 * interface blocks below) needs to be declared as an array.
5196 if (!var
->type
->is_array()) {
5197 _mesa_glsl_error(&loc
, state
,
5198 "geometry shader inputs must be arrays");
5201 handle_geometry_shader_input_decl(state
, loc
, var
);
5202 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5203 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5205 * It is a compile-time error to declare a fragment shader
5206 * input with, or that contains, any of the following types:
5210 * * An array of arrays
5211 * * An array of structures
5212 * * A structure containing an array
5213 * * A structure containing a structure
5215 if (state
->es_shader
) {
5216 const glsl_type
*check_type
= var
->type
->without_array();
5217 if (check_type
->is_boolean() ||
5218 check_type
->contains_opaque()) {
5219 _mesa_glsl_error(&loc
, state
,
5220 "fragment shader input cannot have type %s",
5223 if (var
->type
->is_array() &&
5224 var
->type
->fields
.array
->is_array()) {
5225 _mesa_glsl_error(&loc
, state
,
5227 "cannot have an array of arrays",
5228 _mesa_shader_stage_to_string(state
->stage
));
5230 if (var
->type
->is_array() &&
5231 var
->type
->fields
.array
->is_record()) {
5232 _mesa_glsl_error(&loc
, state
,
5233 "fragment shader input "
5234 "cannot have an array of structs");
5236 if (var
->type
->is_record()) {
5237 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5238 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5239 var
->type
->fields
.structure
[i
].type
->is_record())
5240 _mesa_glsl_error(&loc
, state
,
5241 "fragment shader input cannot have "
5242 "a struct that contains an "
5247 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5248 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5249 handle_tess_shader_input_decl(state
, loc
, var
);
5251 } else if (var
->data
.mode
== ir_var_shader_out
) {
5252 const glsl_type
*check_type
= var
->type
->without_array();
5254 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5256 * It is a compile-time error to declare a fragment shader output
5257 * that contains any of the following:
5259 * * A Boolean type (bool, bvec2 ...)
5260 * * A double-precision scalar or vector (double, dvec2 ...)
5265 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5266 if (check_type
->is_record() || check_type
->is_matrix())
5267 _mesa_glsl_error(&loc
, state
,
5268 "fragment shader output "
5269 "cannot have struct or matrix type");
5270 switch (check_type
->base_type
) {
5271 case GLSL_TYPE_UINT
:
5273 case GLSL_TYPE_FLOAT
:
5276 _mesa_glsl_error(&loc
, state
,
5277 "fragment shader output cannot have "
5278 "type %s", check_type
->name
);
5282 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5284 * It is a compile-time error to declare a vertex shader output
5285 * with, or that contains, any of the following types:
5289 * * An array of arrays
5290 * * An array of structures
5291 * * A structure containing an array
5292 * * A structure containing a structure
5294 * It is a compile-time error to declare a fragment shader output
5295 * with, or that contains, any of the following types:
5301 * * An array of array
5303 * ES 3.20 updates this to apply to tessellation and geometry shaders
5304 * as well. Because there are per-vertex arrays in the new stages,
5305 * it strikes the "array of..." rules and replaces them with these:
5307 * * For per-vertex-arrayed variables (applies to tessellation
5308 * control, tessellation evaluation and geometry shaders):
5310 * * Per-vertex-arrayed arrays of arrays
5311 * * Per-vertex-arrayed arrays of structures
5313 * * For non-per-vertex-arrayed variables:
5315 * * An array of arrays
5316 * * An array of structures
5318 * which basically says to unwrap the per-vertex aspect and apply
5321 if (state
->es_shader
) {
5322 if (var
->type
->is_array() &&
5323 var
->type
->fields
.array
->is_array()) {
5324 _mesa_glsl_error(&loc
, state
,
5326 "cannot have an array of arrays",
5327 _mesa_shader_stage_to_string(state
->stage
));
5329 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5330 const glsl_type
*type
= var
->type
;
5332 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5333 !var
->data
.patch
&& var
->type
->is_array()) {
5334 type
= var
->type
->fields
.array
;
5337 if (type
->is_array() && type
->fields
.array
->is_record()) {
5338 _mesa_glsl_error(&loc
, state
,
5339 "%s shader output cannot have "
5340 "an array of structs",
5341 _mesa_shader_stage_to_string(state
->stage
));
5343 if (type
->is_record()) {
5344 for (unsigned i
= 0; i
< type
->length
; i
++) {
5345 if (type
->fields
.structure
[i
].type
->is_array() ||
5346 type
->fields
.structure
[i
].type
->is_record())
5347 _mesa_glsl_error(&loc
, state
,
5348 "%s shader output cannot have a "
5349 "struct that contains an "
5351 _mesa_shader_stage_to_string(state
->stage
));
5357 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5358 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5360 } else if (var
->type
->contains_subroutine()) {
5361 /* declare subroutine uniforms as hidden */
5362 var
->data
.how_declared
= ir_var_hidden
;
5365 /* From section 4.3.4 of the GLSL 4.00 spec:
5366 * "Input variables may not be declared using the patch in qualifier
5367 * in tessellation control or geometry shaders."
5369 * From section 4.3.6 of the GLSL 4.00 spec:
5370 * "It is an error to use patch out in a vertex, tessellation
5371 * evaluation, or geometry shader."
5373 * This doesn't explicitly forbid using them in a fragment shader, but
5374 * that's probably just an oversight.
5376 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5377 && this->type
->qualifier
.flags
.q
.patch
5378 && this->type
->qualifier
.flags
.q
.in
) {
5380 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5381 "tessellation evaluation shader");
5384 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5385 && this->type
->qualifier
.flags
.q
.patch
5386 && this->type
->qualifier
.flags
.q
.out
) {
5388 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5389 "tessellation control shader");
5392 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5394 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5395 state
->check_precision_qualifiers_allowed(&loc
);
5398 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5399 !precision_qualifier_allowed(var
->type
)) {
5400 _mesa_glsl_error(&loc
, state
,
5401 "precision qualifiers apply only to floating point"
5402 ", integer and opaque types");
5405 /* From section 4.1.7 of the GLSL 4.40 spec:
5407 * "[Opaque types] can only be declared as function
5408 * parameters or uniform-qualified variables."
5410 * From section 4.1.7 of the ARB_bindless_texture spec:
5412 * "Samplers may be declared as shader inputs and outputs, as uniform
5413 * variables, as temporary variables, and as function parameters."
5415 * From section 4.1.X of the ARB_bindless_texture spec:
5417 * "Images may be declared as shader inputs and outputs, as uniform
5418 * variables, as temporary variables, and as function parameters."
5420 if (!this->type
->qualifier
.flags
.q
.uniform
&&
5421 (var_type
->contains_atomic() ||
5422 (!state
->has_bindless() && var_type
->contains_opaque()))) {
5423 _mesa_glsl_error(&loc
, state
,
5424 "%s variables must be declared uniform",
5425 state
->has_bindless() ? "atomic" : "opaque");
5428 /* Process the initializer and add its instructions to a temporary
5429 * list. This list will be added to the instruction stream (below) after
5430 * the declaration is added. This is done because in some cases (such as
5431 * redeclarations) the declaration may not actually be added to the
5432 * instruction stream.
5434 exec_list initializer_instructions
;
5436 /* Examine var name here since var may get deleted in the next call */
5437 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5439 bool is_redeclaration
;
5440 var
= get_variable_being_redeclared(&var
, decl
->get_location(), state
,
5441 false /* allow_all_redeclarations */,
5443 if (is_redeclaration
) {
5445 var
->data
.how_declared
== ir_var_declared_in_block
) {
5446 _mesa_glsl_error(&loc
, state
,
5447 "`%s' has already been redeclared using "
5448 "gl_PerVertex", var
->name
);
5450 var
->data
.how_declared
= ir_var_declared_normally
;
5453 if (decl
->initializer
!= NULL
) {
5454 result
= process_initializer(var
,
5456 &initializer_instructions
, state
);
5458 validate_array_dimensions(var_type
, state
, &loc
);
5461 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5463 * "It is an error to write to a const variable outside of
5464 * its declaration, so they must be initialized when
5467 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5468 _mesa_glsl_error(& loc
, state
,
5469 "const declaration of `%s' must be initialized",
5473 if (state
->es_shader
) {
5474 const glsl_type
*const t
= var
->type
;
5476 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5478 * The GL_OES_tessellation_shader spec says about inputs:
5480 * "Declaring an array size is optional. If no size is specified,
5481 * it will be taken from the implementation-dependent maximum
5482 * patch size (gl_MaxPatchVertices)."
5484 * and about TCS outputs:
5486 * "If no size is specified, it will be taken from output patch
5487 * size declared in the shader."
5489 * The GL_OES_geometry_shader spec says:
5491 * "All geometry shader input unsized array declarations will be
5492 * sized by an earlier input primitive layout qualifier, when
5493 * present, as per the following table."
5495 const bool implicitly_sized
=
5496 (var
->data
.mode
== ir_var_shader_in
&&
5497 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5498 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5499 (var
->data
.mode
== ir_var_shader_out
&&
5500 state
->stage
== MESA_SHADER_TESS_CTRL
);
5502 if (t
->is_unsized_array() && !implicitly_sized
)
5503 /* Section 10.17 of the GLSL ES 1.00 specification states that
5504 * unsized array declarations have been removed from the language.
5505 * Arrays that are sized using an initializer are still explicitly
5506 * sized. However, GLSL ES 1.00 does not allow array
5507 * initializers. That is only allowed in GLSL ES 3.00.
5509 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5511 * "An array type can also be formed without specifying a size
5512 * if the definition includes an initializer:
5514 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5515 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5520 _mesa_glsl_error(& loc
, state
,
5521 "unsized array declarations are not allowed in "
5525 /* Section 4.4.6.1 Atomic Counter Layout Qualifiers of the GLSL 4.60 spec:
5527 * "It is a compile-time error to declare an unsized array of
5530 if (var
->type
->is_unsized_array() &&
5531 var
->type
->without_array()->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
5532 _mesa_glsl_error(& loc
, state
,
5533 "Unsized array of atomic_uint is not allowed");
5536 /* If the declaration is not a redeclaration, there are a few additional
5537 * semantic checks that must be applied. In addition, variable that was
5538 * created for the declaration should be added to the IR stream.
5540 if (!is_redeclaration
) {
5541 validate_identifier(decl
->identifier
, loc
, state
);
5543 /* Add the variable to the symbol table. Note that the initializer's
5544 * IR was already processed earlier (though it hasn't been emitted
5545 * yet), without the variable in scope.
5547 * This differs from most C-like languages, but it follows the GLSL
5548 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5551 * "Within a declaration, the scope of a name starts immediately
5552 * after the initializer if present or immediately after the name
5553 * being declared if not."
5555 if (!state
->symbols
->add_variable(var
)) {
5556 YYLTYPE loc
= this->get_location();
5557 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5558 "current scope", decl
->identifier
);
5562 /* Push the variable declaration to the top. It means that all the
5563 * variable declarations will appear in a funny last-to-first order,
5564 * but otherwise we run into trouble if a function is prototyped, a
5565 * global var is decled, then the function is defined with usage of
5566 * the global var. See glslparsertest's CorrectModule.frag.
5568 instructions
->push_head(var
);
5571 instructions
->append_list(&initializer_instructions
);
5575 /* Generally, variable declarations do not have r-values. However,
5576 * one is used for the declaration in
5578 * while (bool b = some_condition()) {
5582 * so we return the rvalue from the last seen declaration here.
5589 ast_parameter_declarator::hir(exec_list
*instructions
,
5590 struct _mesa_glsl_parse_state
*state
)
5593 const struct glsl_type
*type
;
5594 const char *name
= NULL
;
5595 YYLTYPE loc
= this->get_location();
5597 type
= this->type
->glsl_type(& name
, state
);
5601 _mesa_glsl_error(& loc
, state
,
5602 "invalid type `%s' in declaration of `%s'",
5603 name
, this->identifier
);
5605 _mesa_glsl_error(& loc
, state
,
5606 "invalid type in declaration of `%s'",
5610 type
= glsl_type::error_type
;
5613 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5615 * "Functions that accept no input arguments need not use void in the
5616 * argument list because prototypes (or definitions) are required and
5617 * therefore there is no ambiguity when an empty argument list "( )" is
5618 * declared. The idiom "(void)" as a parameter list is provided for
5621 * Placing this check here prevents a void parameter being set up
5622 * for a function, which avoids tripping up checks for main taking
5623 * parameters and lookups of an unnamed symbol.
5625 if (type
->is_void()) {
5626 if (this->identifier
!= NULL
)
5627 _mesa_glsl_error(& loc
, state
,
5628 "named parameter cannot have type `void'");
5634 if (formal_parameter
&& (this->identifier
== NULL
)) {
5635 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5639 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5640 * call already handled the "vec4[..] foo" case.
5642 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5644 if (!type
->is_error() && type
->is_unsized_array()) {
5645 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5647 type
= glsl_type::error_type
;
5651 ir_variable
*var
= new(ctx
)
5652 ir_variable(type
, this->identifier
, ir_var_function_in
);
5654 /* Apply any specified qualifiers to the parameter declaration. Note that
5655 * for function parameters the default mode is 'in'.
5657 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5660 /* From section 4.1.7 of the GLSL 4.40 spec:
5662 * "Opaque variables cannot be treated as l-values; hence cannot
5663 * be used as out or inout function parameters, nor can they be
5666 * From section 4.1.7 of the ARB_bindless_texture spec:
5668 * "Samplers can be used as l-values, so can be assigned into and used
5669 * as "out" and "inout" function parameters."
5671 * From section 4.1.X of the ARB_bindless_texture spec:
5673 * "Images can be used as l-values, so can be assigned into and used as
5674 * "out" and "inout" function parameters."
5676 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5677 && (type
->contains_atomic() ||
5678 (!state
->has_bindless() && type
->contains_opaque()))) {
5679 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5680 "contain %s variables",
5681 state
->has_bindless() ? "atomic" : "opaque");
5682 type
= glsl_type::error_type
;
5685 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5687 * "When calling a function, expressions that do not evaluate to
5688 * l-values cannot be passed to parameters declared as out or inout."
5690 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5692 * "Other binary or unary expressions, non-dereferenced arrays,
5693 * function names, swizzles with repeated fields, and constants
5694 * cannot be l-values."
5696 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5697 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5699 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5701 && !state
->check_version(120, 100, &loc
,
5702 "arrays cannot be out or inout parameters")) {
5703 type
= glsl_type::error_type
;
5706 instructions
->push_tail(var
);
5708 /* Parameter declarations do not have r-values.
5715 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5717 exec_list
*ir_parameters
,
5718 _mesa_glsl_parse_state
*state
)
5720 ast_parameter_declarator
*void_param
= NULL
;
5723 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5724 param
->formal_parameter
= formal
;
5725 param
->hir(ir_parameters
, state
);
5733 if ((void_param
!= NULL
) && (count
> 1)) {
5734 YYLTYPE loc
= void_param
->get_location();
5736 _mesa_glsl_error(& loc
, state
,
5737 "`void' parameter must be only parameter");
5743 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5745 /* IR invariants disallow function declarations or definitions
5746 * nested within other function definitions. But there is no
5747 * requirement about the relative order of function declarations
5748 * and definitions with respect to one another. So simply insert
5749 * the new ir_function block at the end of the toplevel instruction
5752 state
->toplevel_ir
->push_tail(f
);
5757 ast_function::hir(exec_list
*instructions
,
5758 struct _mesa_glsl_parse_state
*state
)
5761 ir_function
*f
= NULL
;
5762 ir_function_signature
*sig
= NULL
;
5763 exec_list hir_parameters
;
5764 YYLTYPE loc
= this->get_location();
5766 const char *const name
= identifier
;
5768 /* New functions are always added to the top-level IR instruction stream,
5769 * so this instruction list pointer is ignored. See also emit_function
5772 (void) instructions
;
5774 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5776 * "Function declarations (prototypes) cannot occur inside of functions;
5777 * they must be at global scope, or for the built-in functions, outside
5778 * the global scope."
5780 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5782 * "User defined functions may only be defined within the global scope."
5784 * Note that this language does not appear in GLSL 1.10.
5786 if ((state
->current_function
!= NULL
) &&
5787 state
->is_version(120, 100)) {
5788 YYLTYPE loc
= this->get_location();
5789 _mesa_glsl_error(&loc
, state
,
5790 "declaration of function `%s' not allowed within "
5791 "function body", name
);
5794 validate_identifier(name
, this->get_location(), state
);
5796 /* Convert the list of function parameters to HIR now so that they can be
5797 * used below to compare this function's signature with previously seen
5798 * signatures for functions with the same name.
5800 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5802 & hir_parameters
, state
);
5804 const char *return_type_name
;
5805 const glsl_type
*return_type
=
5806 this->return_type
->glsl_type(& return_type_name
, state
);
5809 YYLTYPE loc
= this->get_location();
5810 _mesa_glsl_error(&loc
, state
,
5811 "function `%s' has undeclared return type `%s'",
5812 name
, return_type_name
);
5813 return_type
= glsl_type::error_type
;
5816 /* ARB_shader_subroutine states:
5817 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5818 * subroutine(...) to a function declaration."
5820 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
5821 YYLTYPE loc
= this->get_location();
5822 _mesa_glsl_error(&loc
, state
,
5823 "function declaration `%s' cannot have subroutine prepended",
5827 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5828 * "No qualifier is allowed on the return type of a function."
5830 if (this->return_type
->has_qualifiers(state
)) {
5831 YYLTYPE loc
= this->get_location();
5832 _mesa_glsl_error(& loc
, state
,
5833 "function `%s' return type has qualifiers", name
);
5836 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5838 * "Arrays are allowed as arguments and as the return type. In both
5839 * cases, the array must be explicitly sized."
5841 if (return_type
->is_unsized_array()) {
5842 YYLTYPE loc
= this->get_location();
5843 _mesa_glsl_error(& loc
, state
,
5844 "function `%s' return type array must be explicitly "
5848 /* From Section 6.1 (Function Definitions) of the GLSL 1.00 spec:
5850 * "Arrays are allowed as arguments, but not as the return type. [...]
5851 * The return type can also be a structure if the structure does not
5852 * contain an array."
5854 if (state
->language_version
== 100 && return_type
->contains_array()) {
5855 YYLTYPE loc
= this->get_location();
5856 _mesa_glsl_error(& loc
, state
,
5857 "function `%s' return type contains an array", name
);
5860 /* From section 4.1.7 of the GLSL 4.40 spec:
5862 * "[Opaque types] can only be declared as function parameters
5863 * or uniform-qualified variables."
5865 * The ARB_bindless_texture spec doesn't clearly state this, but as it says
5866 * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X,
5867 * (Images)", this should be allowed.
5869 if (return_type
->contains_atomic() ||
5870 (!state
->has_bindless() && return_type
->contains_opaque())) {
5871 YYLTYPE loc
= this->get_location();
5872 _mesa_glsl_error(&loc
, state
,
5873 "function `%s' return type can't contain an %s type",
5874 name
, state
->has_bindless() ? "atomic" : "opaque");
5878 if (return_type
->is_subroutine()) {
5879 YYLTYPE loc
= this->get_location();
5880 _mesa_glsl_error(&loc
, state
,
5881 "function `%s' return type can't be a subroutine type",
5886 /* Create an ir_function if one doesn't already exist. */
5887 f
= state
->symbols
->get_function(name
);
5889 f
= new(ctx
) ir_function(name
);
5890 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
5891 if (!state
->symbols
->add_function(f
)) {
5892 /* This function name shadows a non-function use of the same name. */
5893 YYLTYPE loc
= this->get_location();
5894 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5895 "non-function", name
);
5899 emit_function(state
, f
);
5902 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5904 * "A shader cannot redefine or overload built-in functions."
5906 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5908 * "User code can overload the built-in functions but cannot redefine
5911 if (state
->es_shader
) {
5912 /* Local shader has no exact candidates; check the built-ins. */
5913 _mesa_glsl_initialize_builtin_functions();
5914 if (state
->language_version
>= 300 &&
5915 _mesa_glsl_has_builtin_function(state
, name
)) {
5916 YYLTYPE loc
= this->get_location();
5917 _mesa_glsl_error(& loc
, state
,
5918 "A shader cannot redefine or overload built-in "
5919 "function `%s' in GLSL ES 3.00", name
);
5923 if (state
->language_version
== 100) {
5924 ir_function_signature
*sig
=
5925 _mesa_glsl_find_builtin_function(state
, name
, &hir_parameters
);
5926 if (sig
&& sig
->is_builtin()) {
5927 _mesa_glsl_error(& loc
, state
,
5928 "A shader cannot redefine built-in "
5929 "function `%s' in GLSL ES 1.00", name
);
5934 /* Verify that this function's signature either doesn't match a previously
5935 * seen signature for a function with the same name, or, if a match is found,
5936 * that the previously seen signature does not have an associated definition.
5938 if (state
->es_shader
|| f
->has_user_signature()) {
5939 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5941 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5942 if (badvar
!= NULL
) {
5943 YYLTYPE loc
= this->get_location();
5945 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5946 "qualifiers don't match prototype", name
, badvar
);
5949 if (sig
->return_type
!= return_type
) {
5950 YYLTYPE loc
= this->get_location();
5952 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5953 "match prototype", name
);
5956 if (sig
->is_defined
) {
5957 if (is_definition
) {
5958 YYLTYPE loc
= this->get_location();
5959 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5961 /* We just encountered a prototype that exactly matches a
5962 * function that's already been defined. This is redundant,
5963 * and we should ignore it.
5967 } else if (state
->language_version
== 100 && !is_definition
) {
5968 /* From the GLSL 1.00 spec, section 4.2.7:
5970 * "A particular variable, structure or function declaration
5971 * may occur at most once within a scope with the exception
5972 * that a single function prototype plus the corresponding
5973 * function definition are allowed."
5975 YYLTYPE loc
= this->get_location();
5976 _mesa_glsl_error(&loc
, state
, "function `%s' redeclared", name
);
5981 /* Verify the return type of main() */
5982 if (strcmp(name
, "main") == 0) {
5983 if (! return_type
->is_void()) {
5984 YYLTYPE loc
= this->get_location();
5986 _mesa_glsl_error(& loc
, state
, "main() must return void");
5989 if (!hir_parameters
.is_empty()) {
5990 YYLTYPE loc
= this->get_location();
5992 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5996 /* Finish storing the information about this new function in its signature.
5999 sig
= new(ctx
) ir_function_signature(return_type
);
6000 f
->add_signature(sig
);
6003 sig
->replace_parameters(&hir_parameters
);
6006 if (this->return_type
->qualifier
.subroutine_list
) {
6009 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
6010 unsigned qual_index
;
6011 if (process_qualifier_constant(state
, &loc
, "index",
6012 this->return_type
->qualifier
.index
,
6014 if (!state
->has_explicit_uniform_location()) {
6015 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
6016 "GL_ARB_explicit_uniform_location or "
6018 } else if (qual_index
>= MAX_SUBROUTINES
) {
6019 _mesa_glsl_error(&loc
, state
,
6020 "invalid subroutine index (%d) index must "
6021 "be a number between 0 and "
6022 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
6023 MAX_SUBROUTINES
- 1);
6025 f
->subroutine_index
= qual_index
;
6030 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
6031 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
6032 f
->num_subroutine_types
);
6034 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
6035 const struct glsl_type
*type
;
6036 /* the subroutine type must be already declared */
6037 type
= state
->symbols
->get_type(decl
->identifier
);
6039 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
6042 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
6043 ir_function
*fn
= state
->subroutine_types
[i
];
6044 ir_function_signature
*tsig
= NULL
;
6046 if (strcmp(fn
->name
, decl
->identifier
))
6049 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
6052 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
6054 if (tsig
->return_type
!= sig
->return_type
) {
6055 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
6059 f
->subroutine_types
[idx
++] = type
;
6061 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
6063 state
->num_subroutines
+ 1);
6064 state
->subroutines
[state
->num_subroutines
] = f
;
6065 state
->num_subroutines
++;
6069 if (this->return_type
->qualifier
.is_subroutine_decl()) {
6070 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
6071 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
6074 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
6076 state
->num_subroutine_types
+ 1);
6077 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
6078 state
->num_subroutine_types
++;
6080 f
->is_subroutine
= true;
6083 /* Function declarations (prototypes) do not have r-values.
6090 ast_function_definition::hir(exec_list
*instructions
,
6091 struct _mesa_glsl_parse_state
*state
)
6093 prototype
->is_definition
= true;
6094 prototype
->hir(instructions
, state
);
6096 ir_function_signature
*signature
= prototype
->signature
;
6097 if (signature
== NULL
)
6100 assert(state
->current_function
== NULL
);
6101 state
->current_function
= signature
;
6102 state
->found_return
= false;
6104 /* Duplicate parameters declared in the prototype as concrete variables.
6105 * Add these to the symbol table.
6107 state
->symbols
->push_scope();
6108 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
6109 assert(var
->as_variable() != NULL
);
6111 /* The only way a parameter would "exist" is if two parameters have
6114 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
6115 YYLTYPE loc
= this->get_location();
6117 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
6119 state
->symbols
->add_variable(var
);
6123 /* Convert the body of the function to HIR. */
6124 this->body
->hir(&signature
->body
, state
);
6125 signature
->is_defined
= true;
6127 state
->symbols
->pop_scope();
6129 assert(state
->current_function
== signature
);
6130 state
->current_function
= NULL
;
6132 if (!signature
->return_type
->is_void() && !state
->found_return
) {
6133 YYLTYPE loc
= this->get_location();
6134 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
6135 "%s, but no return statement",
6136 signature
->function_name(),
6137 signature
->return_type
->name
);
6140 /* Function definitions do not have r-values.
6147 ast_jump_statement::hir(exec_list
*instructions
,
6148 struct _mesa_glsl_parse_state
*state
)
6155 assert(state
->current_function
);
6157 if (opt_return_value
) {
6158 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
6160 /* The value of the return type can be NULL if the shader says
6161 * 'return foo();' and foo() is a function that returns void.
6163 * NOTE: The GLSL spec doesn't say that this is an error. The type
6164 * of the return value is void. If the return type of the function is
6165 * also void, then this should compile without error. Seriously.
6167 const glsl_type
*const ret_type
=
6168 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
6170 /* Implicit conversions are not allowed for return values prior to
6171 * ARB_shading_language_420pack.
6173 if (state
->current_function
->return_type
!= ret_type
) {
6174 YYLTYPE loc
= this->get_location();
6176 if (state
->has_420pack()) {
6177 if (!apply_implicit_conversion(state
->current_function
->return_type
,
6179 _mesa_glsl_error(& loc
, state
,
6180 "could not implicitly convert return value "
6181 "to %s, in function `%s'",
6182 state
->current_function
->return_type
->name
,
6183 state
->current_function
->function_name());
6186 _mesa_glsl_error(& loc
, state
,
6187 "`return' with wrong type %s, in function `%s' "
6190 state
->current_function
->function_name(),
6191 state
->current_function
->return_type
->name
);
6193 } else if (state
->current_function
->return_type
->base_type
==
6195 YYLTYPE loc
= this->get_location();
6197 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
6198 * specs add a clarification:
6200 * "A void function can only use return without a return argument, even if
6201 * the return argument has void type. Return statements only accept values:
6204 * void func2() { return func1(); } // illegal return statement"
6206 _mesa_glsl_error(& loc
, state
,
6207 "void functions can only use `return' without a "
6211 inst
= new(ctx
) ir_return(ret
);
6213 if (state
->current_function
->return_type
->base_type
!=
6215 YYLTYPE loc
= this->get_location();
6217 _mesa_glsl_error(& loc
, state
,
6218 "`return' with no value, in function %s returning "
6220 state
->current_function
->function_name());
6222 inst
= new(ctx
) ir_return
;
6225 state
->found_return
= true;
6226 instructions
->push_tail(inst
);
6231 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6232 YYLTYPE loc
= this->get_location();
6234 _mesa_glsl_error(& loc
, state
,
6235 "`discard' may only appear in a fragment shader");
6237 instructions
->push_tail(new(ctx
) ir_discard
);
6242 if (mode
== ast_continue
&&
6243 state
->loop_nesting_ast
== NULL
) {
6244 YYLTYPE loc
= this->get_location();
6246 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
6247 } else if (mode
== ast_break
&&
6248 state
->loop_nesting_ast
== NULL
&&
6249 state
->switch_state
.switch_nesting_ast
== NULL
) {
6250 YYLTYPE loc
= this->get_location();
6252 _mesa_glsl_error(& loc
, state
,
6253 "break may only appear in a loop or a switch");
6255 /* For a loop, inline the for loop expression again, since we don't
6256 * know where near the end of the loop body the normal copy of it is
6257 * going to be placed. Same goes for the condition for a do-while
6260 if (state
->loop_nesting_ast
!= NULL
&&
6261 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
6262 if (state
->loop_nesting_ast
->rest_expression
) {
6263 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
6266 if (state
->loop_nesting_ast
->mode
==
6267 ast_iteration_statement::ast_do_while
) {
6268 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
6272 if (state
->switch_state
.is_switch_innermost
&&
6273 mode
== ast_continue
) {
6274 /* Set 'continue_inside' to true. */
6275 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6276 ir_dereference_variable
*deref_continue_inside_var
=
6277 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6278 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6281 /* Break out from the switch, continue for the loop will
6282 * be called right after switch. */
6283 ir_loop_jump
*const jump
=
6284 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6285 instructions
->push_tail(jump
);
6287 } else if (state
->switch_state
.is_switch_innermost
&&
6288 mode
== ast_break
) {
6289 /* Force break out of switch by inserting a break. */
6290 ir_loop_jump
*const jump
=
6291 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6292 instructions
->push_tail(jump
);
6294 ir_loop_jump
*const jump
=
6295 new(ctx
) ir_loop_jump((mode
== ast_break
)
6296 ? ir_loop_jump::jump_break
6297 : ir_loop_jump::jump_continue
);
6298 instructions
->push_tail(jump
);
6305 /* Jump instructions do not have r-values.
6312 ast_selection_statement::hir(exec_list
*instructions
,
6313 struct _mesa_glsl_parse_state
*state
)
6317 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6319 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6321 * "Any expression whose type evaluates to a Boolean can be used as the
6322 * conditional expression bool-expression. Vector types are not accepted
6323 * as the expression to if."
6325 * The checks are separated so that higher quality diagnostics can be
6326 * generated for cases where both rules are violated.
6328 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6329 YYLTYPE loc
= this->condition
->get_location();
6331 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6335 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6337 if (then_statement
!= NULL
) {
6338 state
->symbols
->push_scope();
6339 then_statement
->hir(& stmt
->then_instructions
, state
);
6340 state
->symbols
->pop_scope();
6343 if (else_statement
!= NULL
) {
6344 state
->symbols
->push_scope();
6345 else_statement
->hir(& stmt
->else_instructions
, state
);
6346 state
->symbols
->pop_scope();
6349 instructions
->push_tail(stmt
);
6351 /* if-statements do not have r-values.
6358 /** Value of the case label. */
6361 /** Does this label occur after the default? */
6365 * AST for the case label.
6367 * This is only used to generate error messages for duplicate labels.
6369 ast_expression
*ast
;
6372 /* Used for detection of duplicate case values, compare
6373 * given contents directly.
6376 compare_case_value(const void *a
, const void *b
)
6378 return ((struct case_label
*) a
)->value
== ((struct case_label
*) b
)->value
;
6382 /* Used for detection of duplicate case values, just
6383 * returns key contents as is.
6386 key_contents(const void *key
)
6388 return ((struct case_label
*) key
)->value
;
6393 ast_switch_statement::hir(exec_list
*instructions
,
6394 struct _mesa_glsl_parse_state
*state
)
6398 ir_rvalue
*const test_expression
=
6399 this->test_expression
->hir(instructions
, state
);
6401 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6403 * "The type of init-expression in a switch statement must be a
6406 if (!test_expression
->type
->is_scalar() ||
6407 !test_expression
->type
->is_integer()) {
6408 YYLTYPE loc
= this->test_expression
->get_location();
6410 _mesa_glsl_error(& loc
,
6412 "switch-statement expression must be scalar "
6417 /* Track the switch-statement nesting in a stack-like manner.
6419 struct glsl_switch_state saved
= state
->switch_state
;
6421 state
->switch_state
.is_switch_innermost
= true;
6422 state
->switch_state
.switch_nesting_ast
= this;
6423 state
->switch_state
.labels_ht
=
6424 _mesa_hash_table_create(NULL
, key_contents
,
6425 compare_case_value
);
6426 state
->switch_state
.previous_default
= NULL
;
6428 /* Initalize is_fallthru state to false.
6430 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6431 state
->switch_state
.is_fallthru_var
=
6432 new(ctx
) ir_variable(glsl_type::bool_type
,
6433 "switch_is_fallthru_tmp",
6435 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6437 ir_dereference_variable
*deref_is_fallthru_var
=
6438 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6439 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6442 /* Initialize continue_inside state to false.
6444 state
->switch_state
.continue_inside
=
6445 new(ctx
) ir_variable(glsl_type::bool_type
,
6446 "continue_inside_tmp",
6448 instructions
->push_tail(state
->switch_state
.continue_inside
);
6450 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6451 ir_dereference_variable
*deref_continue_inside_var
=
6452 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6453 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6456 state
->switch_state
.run_default
=
6457 new(ctx
) ir_variable(glsl_type::bool_type
,
6460 instructions
->push_tail(state
->switch_state
.run_default
);
6462 /* Loop around the switch is used for flow control. */
6463 ir_loop
* loop
= new(ctx
) ir_loop();
6464 instructions
->push_tail(loop
);
6466 /* Cache test expression.
6468 test_to_hir(&loop
->body_instructions
, state
);
6470 /* Emit code for body of switch stmt.
6472 body
->hir(&loop
->body_instructions
, state
);
6474 /* Insert a break at the end to exit loop. */
6475 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6476 loop
->body_instructions
.push_tail(jump
);
6478 /* If we are inside loop, check if continue got called inside switch. */
6479 if (state
->loop_nesting_ast
!= NULL
) {
6480 ir_dereference_variable
*deref_continue_inside
=
6481 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6482 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6483 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6485 if (state
->loop_nesting_ast
!= NULL
) {
6486 if (state
->loop_nesting_ast
->rest_expression
) {
6487 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6490 if (state
->loop_nesting_ast
->mode
==
6491 ast_iteration_statement::ast_do_while
) {
6492 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6495 irif
->then_instructions
.push_tail(jump
);
6496 instructions
->push_tail(irif
);
6499 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6501 state
->switch_state
= saved
;
6503 /* Switch statements do not have r-values. */
6509 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6510 struct _mesa_glsl_parse_state
*state
)
6514 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6515 * on the switch test case. The first one would be already raised when
6516 * getting the test_expression at ast_switch_statement::hir
6518 test_expression
->set_is_lhs(true);
6519 /* Cache value of test expression. */
6520 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6522 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6525 ir_dereference_variable
*deref_test_var
=
6526 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6528 instructions
->push_tail(state
->switch_state
.test_var
);
6529 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6534 ast_switch_body::hir(exec_list
*instructions
,
6535 struct _mesa_glsl_parse_state
*state
)
6538 stmts
->hir(instructions
, state
);
6540 /* Switch bodies do not have r-values. */
6545 ast_case_statement_list::hir(exec_list
*instructions
,
6546 struct _mesa_glsl_parse_state
*state
)
6548 exec_list default_case
, after_default
, tmp
;
6550 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6551 case_stmt
->hir(&tmp
, state
);
6554 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6555 default_case
.append_list(&tmp
);
6559 /* If default case found, append 'after_default' list. */
6560 if (!default_case
.is_empty())
6561 after_default
.append_list(&tmp
);
6563 instructions
->append_list(&tmp
);
6566 /* Handle the default case. This is done here because default might not be
6567 * the last case. We need to add checks against following cases first to see
6568 * if default should be chosen or not.
6570 if (!default_case
.is_empty()) {
6571 struct hash_entry
*entry
;
6572 ir_factory
body(instructions
, state
);
6574 ir_expression
*cmp
= NULL
;
6576 hash_table_foreach(state
->switch_state
.labels_ht
, entry
) {
6577 const struct case_label
*const l
= (struct case_label
*) entry
->data
;
6579 /* If the switch init-value is the value of one of the labels that
6580 * occurs after the default case, disable execution of the default
6583 if (l
->after_default
) {
6584 ir_constant
*const cnst
=
6585 state
->switch_state
.test_var
->type
->base_type
== GLSL_TYPE_UINT
6586 ? body
.constant(unsigned(l
->value
))
6587 : body
.constant(int(l
->value
));
6590 ? equal(cnst
, state
->switch_state
.test_var
)
6591 : logic_or(cmp
, equal(cnst
, state
->switch_state
.test_var
));
6596 body
.emit(assign(state
->switch_state
.run_default
, logic_not(cmp
)));
6598 body
.emit(assign(state
->switch_state
.run_default
, body
.constant(true)));
6600 /* Append default case and all cases after it. */
6601 instructions
->append_list(&default_case
);
6602 instructions
->append_list(&after_default
);
6605 /* Case statements do not have r-values. */
6610 ast_case_statement::hir(exec_list
*instructions
,
6611 struct _mesa_glsl_parse_state
*state
)
6613 labels
->hir(instructions
, state
);
6615 /* Guard case statements depending on fallthru state. */
6616 ir_dereference_variable
*const deref_fallthru_guard
=
6617 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6618 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6620 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6621 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6623 instructions
->push_tail(test_fallthru
);
6625 /* Case statements do not have r-values. */
6631 ast_case_label_list::hir(exec_list
*instructions
,
6632 struct _mesa_glsl_parse_state
*state
)
6634 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6635 label
->hir(instructions
, state
);
6637 /* Case labels do not have r-values. */
6642 ast_case_label::hir(exec_list
*instructions
,
6643 struct _mesa_glsl_parse_state
*state
)
6645 ir_factory
body(instructions
, state
);
6647 ir_variable
*const fallthru_var
= state
->switch_state
.is_fallthru_var
;
6649 /* If not default case, ... */
6650 if (this->test_value
!= NULL
) {
6651 /* Conditionally set fallthru state based on
6652 * comparison of cached test expression value to case label.
6654 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6655 ir_constant
*label_const
=
6656 label_rval
->constant_expression_value(body
.mem_ctx
);
6659 YYLTYPE loc
= this->test_value
->get_location();
6661 _mesa_glsl_error(& loc
, state
,
6662 "switch statement case label must be a "
6663 "constant expression");
6665 /* Stuff a dummy value in to allow processing to continue. */
6666 label_const
= body
.constant(0);
6669 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6670 &label_const
->value
.u
[0]);
6673 const struct case_label
*const l
=
6674 (struct case_label
*) entry
->data
;
6675 const ast_expression
*const previous_label
= l
->ast
;
6676 YYLTYPE loc
= this->test_value
->get_location();
6678 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6680 loc
= previous_label
->get_location();
6681 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6683 struct case_label
*l
= ralloc(state
->switch_state
.labels_ht
,
6686 l
->value
= label_const
->value
.u
[0];
6687 l
->after_default
= state
->switch_state
.previous_default
!= NULL
;
6688 l
->ast
= this->test_value
;
6690 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6691 &label_const
->value
.u
[0],
6696 /* Create an r-value version of the ir_constant label here (after we may
6697 * have created a fake one in error cases) that can be passed to
6698 * apply_implicit_conversion below.
6700 ir_rvalue
*label
= label_const
;
6702 ir_rvalue
*deref_test_var
=
6703 new(body
.mem_ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6706 * From GLSL 4.40 specification section 6.2 ("Selection"):
6708 * "The type of the init-expression value in a switch statement must
6709 * be a scalar int or uint. The type of the constant-expression value
6710 * in a case label also must be a scalar int or uint. When any pair
6711 * of these values is tested for "equal value" and the types do not
6712 * match, an implicit conversion will be done to convert the int to a
6713 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6716 if (label
->type
!= state
->switch_state
.test_var
->type
) {
6717 YYLTYPE loc
= this->test_value
->get_location();
6719 const glsl_type
*type_a
= label
->type
;
6720 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6722 /* Check if int->uint implicit conversion is supported. */
6723 bool integer_conversion_supported
=
6724 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6727 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6728 !integer_conversion_supported
) {
6729 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6730 "init-expression and case label (%s != %s)",
6731 type_a
->name
, type_b
->name
);
6733 /* Conversion of the case label. */
6734 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6735 if (!apply_implicit_conversion(glsl_type::uint_type
,
6737 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6739 /* Conversion of the init-expression value. */
6740 if (!apply_implicit_conversion(glsl_type::uint_type
,
6741 deref_test_var
, state
))
6742 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6746 /* If the implicit conversion was allowed, the types will already be
6747 * the same. If the implicit conversion wasn't allowed, smash the
6748 * type of the label anyway. This will prevent the expression
6749 * constructor (below) from failing an assertion.
6751 label
->type
= deref_test_var
->type
;
6754 body
.emit(assign(fallthru_var
,
6755 logic_or(fallthru_var
, equal(label
, deref_test_var
))));
6756 } else { /* default case */
6757 if (state
->switch_state
.previous_default
) {
6758 YYLTYPE loc
= this->get_location();
6759 _mesa_glsl_error(& loc
, state
,
6760 "multiple default labels in one switch");
6762 loc
= state
->switch_state
.previous_default
->get_location();
6763 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6765 state
->switch_state
.previous_default
= this;
6767 /* Set fallthru condition on 'run_default' bool. */
6768 body
.emit(assign(fallthru_var
,
6769 logic_or(fallthru_var
,
6770 state
->switch_state
.run_default
)));
6773 /* Case statements do not have r-values. */
6778 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6779 struct _mesa_glsl_parse_state
*state
)
6783 if (condition
!= NULL
) {
6784 ir_rvalue
*const cond
=
6785 condition
->hir(instructions
, state
);
6788 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6789 YYLTYPE loc
= condition
->get_location();
6791 _mesa_glsl_error(& loc
, state
,
6792 "loop condition must be scalar boolean");
6794 /* As the first code in the loop body, generate a block that looks
6795 * like 'if (!condition) break;' as the loop termination condition.
6797 ir_rvalue
*const not_cond
=
6798 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6800 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6802 ir_jump
*const break_stmt
=
6803 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6805 if_stmt
->then_instructions
.push_tail(break_stmt
);
6806 instructions
->push_tail(if_stmt
);
6813 ast_iteration_statement::hir(exec_list
*instructions
,
6814 struct _mesa_glsl_parse_state
*state
)
6818 /* For-loops and while-loops start a new scope, but do-while loops do not.
6820 if (mode
!= ast_do_while
)
6821 state
->symbols
->push_scope();
6823 if (init_statement
!= NULL
)
6824 init_statement
->hir(instructions
, state
);
6826 ir_loop
*const stmt
= new(ctx
) ir_loop();
6827 instructions
->push_tail(stmt
);
6829 /* Track the current loop nesting. */
6830 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6832 state
->loop_nesting_ast
= this;
6834 /* Likewise, indicate that following code is closest to a loop,
6835 * NOT closest to a switch.
6837 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6838 state
->switch_state
.is_switch_innermost
= false;
6840 if (mode
!= ast_do_while
)
6841 condition_to_hir(&stmt
->body_instructions
, state
);
6844 body
->hir(& stmt
->body_instructions
, state
);
6846 if (rest_expression
!= NULL
)
6847 rest_expression
->hir(& stmt
->body_instructions
, state
);
6849 if (mode
== ast_do_while
)
6850 condition_to_hir(&stmt
->body_instructions
, state
);
6852 if (mode
!= ast_do_while
)
6853 state
->symbols
->pop_scope();
6855 /* Restore previous nesting before returning. */
6856 state
->loop_nesting_ast
= nesting_ast
;
6857 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6859 /* Loops do not have r-values.
6866 * Determine if the given type is valid for establishing a default precision
6869 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6871 * "The precision statement
6873 * precision precision-qualifier type;
6875 * can be used to establish a default precision qualifier. The type field
6876 * can be either int or float or any of the sampler types, and the
6877 * precision-qualifier can be lowp, mediump, or highp."
6879 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6880 * qualifiers on sampler types, but this seems like an oversight (since the
6881 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6882 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6886 is_valid_default_precision_type(const struct glsl_type
*const type
)
6891 switch (type
->base_type
) {
6893 case GLSL_TYPE_FLOAT
:
6894 /* "int" and "float" are valid, but vectors and matrices are not. */
6895 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6896 case GLSL_TYPE_SAMPLER
:
6897 case GLSL_TYPE_IMAGE
:
6898 case GLSL_TYPE_ATOMIC_UINT
:
6907 ast_type_specifier::hir(exec_list
*instructions
,
6908 struct _mesa_glsl_parse_state
*state
)
6910 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6913 YYLTYPE loc
= this->get_location();
6915 /* If this is a precision statement, check that the type to which it is
6916 * applied is either float or int.
6918 * From section 4.5.3 of the GLSL 1.30 spec:
6919 * "The precision statement
6920 * precision precision-qualifier type;
6921 * can be used to establish a default precision qualifier. The type
6922 * field can be either int or float [...]. Any other types or
6923 * qualifiers will result in an error.
6925 if (this->default_precision
!= ast_precision_none
) {
6926 if (!state
->check_precision_qualifiers_allowed(&loc
))
6929 if (this->structure
!= NULL
) {
6930 _mesa_glsl_error(&loc
, state
,
6931 "precision qualifiers do not apply to structures");
6935 if (this->array_specifier
!= NULL
) {
6936 _mesa_glsl_error(&loc
, state
,
6937 "default precision statements do not apply to "
6942 const struct glsl_type
*const type
=
6943 state
->symbols
->get_type(this->type_name
);
6944 if (!is_valid_default_precision_type(type
)) {
6945 _mesa_glsl_error(&loc
, state
,
6946 "default precision statements apply only to "
6947 "float, int, and opaque types");
6951 if (state
->es_shader
) {
6952 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6955 * "Non-precision qualified declarations will use the precision
6956 * qualifier specified in the most recent precision statement
6957 * that is still in scope. The precision statement has the same
6958 * scoping rules as variable declarations. If it is declared
6959 * inside a compound statement, its effect stops at the end of
6960 * the innermost statement it was declared in. Precision
6961 * statements in nested scopes override precision statements in
6962 * outer scopes. Multiple precision statements for the same basic
6963 * type can appear inside the same scope, with later statements
6964 * overriding earlier statements within that scope."
6966 * Default precision specifications follow the same scope rules as
6967 * variables. So, we can track the state of the default precision
6968 * qualifiers in the symbol table, and the rules will just work. This
6969 * is a slight abuse of the symbol table, but it has the semantics
6972 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6973 this->default_precision
);
6976 /* FINISHME: Translate precision statements into IR. */
6980 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6981 * process_record_constructor() can do type-checking on C-style initializer
6982 * expressions of structs, but ast_struct_specifier should only be translated
6983 * to HIR if it is declaring the type of a structure.
6985 * The ->is_declaration field is false for initializers of variables
6986 * declared separately from the struct's type definition.
6988 * struct S { ... }; (is_declaration = true)
6989 * struct T { ... } t = { ... }; (is_declaration = true)
6990 * S s = { ... }; (is_declaration = false)
6992 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6993 return this->structure
->hir(instructions
, state
);
7000 * Process a structure or interface block tree into an array of structure fields
7002 * After parsing, where there are some syntax differnces, structures and
7003 * interface blocks are almost identical. They are similar enough that the
7004 * AST for each can be processed the same way into a set of
7005 * \c glsl_struct_field to describe the members.
7007 * If we're processing an interface block, var_mode should be the type of the
7008 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
7009 * ir_var_shader_storage). If we're processing a structure, var_mode should be
7013 * The number of fields processed. A pointer to the array structure fields is
7014 * stored in \c *fields_ret.
7017 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
7018 struct _mesa_glsl_parse_state
*state
,
7019 exec_list
*declarations
,
7020 glsl_struct_field
**fields_ret
,
7022 enum glsl_matrix_layout matrix_layout
,
7023 bool allow_reserved_names
,
7024 ir_variable_mode var_mode
,
7025 ast_type_qualifier
*layout
,
7026 unsigned block_stream
,
7027 unsigned block_xfb_buffer
,
7028 unsigned block_xfb_offset
,
7029 unsigned expl_location
,
7030 unsigned expl_align
)
7032 unsigned decl_count
= 0;
7033 unsigned next_offset
= 0;
7035 /* Make an initial pass over the list of fields to determine how
7036 * many there are. Each element in this list is an ast_declarator_list.
7037 * This means that we actually need to count the number of elements in the
7038 * 'declarations' list in each of the elements.
7040 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7041 decl_count
+= decl_list
->declarations
.length();
7044 /* Allocate storage for the fields and process the field
7045 * declarations. As the declarations are processed, try to also convert
7046 * the types to HIR. This ensures that structure definitions embedded in
7047 * other structure definitions or in interface blocks are processed.
7049 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
7052 bool first_member
= true;
7053 bool first_member_has_explicit_location
= false;
7056 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7057 const char *type_name
;
7058 YYLTYPE loc
= decl_list
->get_location();
7060 decl_list
->type
->specifier
->hir(instructions
, state
);
7062 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
7064 * "Anonymous structures are not supported; so embedded structures
7065 * must have a declarator. A name given to an embedded struct is
7066 * scoped at the same level as the struct it is embedded in."
7068 * The same section of the GLSL 1.20 spec says:
7070 * "Anonymous structures are not supported. Embedded structures are
7073 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
7074 * embedded structures in 1.10 only.
7076 if (state
->language_version
!= 110 &&
7077 decl_list
->type
->specifier
->structure
!= NULL
)
7078 _mesa_glsl_error(&loc
, state
,
7079 "embedded structure declarations are not allowed");
7081 const glsl_type
*decl_type
=
7082 decl_list
->type
->glsl_type(& type_name
, state
);
7084 const struct ast_type_qualifier
*const qual
=
7085 &decl_list
->type
->qualifier
;
7087 /* From section 4.3.9 of the GLSL 4.40 spec:
7089 * "[In interface blocks] opaque types are not allowed."
7091 * It should be impossible for decl_type to be NULL here. Cases that
7092 * might naturally lead to decl_type being NULL, especially for the
7093 * is_interface case, will have resulted in compilation having
7094 * already halted due to a syntax error.
7099 /* From section 4.3.7 of the ARB_bindless_texture spec:
7101 * "(remove the following bullet from the last list on p. 39,
7102 * thereby permitting sampler types in interface blocks; image
7103 * types are also permitted in blocks by this extension)"
7105 * * sampler types are not allowed
7107 if (decl_type
->contains_atomic() ||
7108 (!state
->has_bindless() && decl_type
->contains_opaque())) {
7109 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
7110 "interface block contains %s variable",
7111 state
->has_bindless() ? "atomic" : "opaque");
7114 if (decl_type
->contains_atomic()) {
7115 /* From section 4.1.7.3 of the GLSL 4.40 spec:
7117 * "Members of structures cannot be declared as atomic counter
7120 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
7123 if (!state
->has_bindless() && decl_type
->contains_image()) {
7124 /* FINISHME: Same problem as with atomic counters.
7125 * FINISHME: Request clarification from Khronos and add
7126 * FINISHME: spec quotation here.
7128 _mesa_glsl_error(&loc
, state
, "image in structure");
7132 if (qual
->flags
.q
.explicit_binding
) {
7133 _mesa_glsl_error(&loc
, state
,
7134 "binding layout qualifier cannot be applied "
7135 "to struct or interface block members");
7139 if (!first_member
) {
7140 if (!layout
->flags
.q
.explicit_location
&&
7141 ((first_member_has_explicit_location
&&
7142 !qual
->flags
.q
.explicit_location
) ||
7143 (!first_member_has_explicit_location
&&
7144 qual
->flags
.q
.explicit_location
))) {
7145 _mesa_glsl_error(&loc
, state
,
7146 "when block-level location layout qualifier "
7147 "is not supplied either all members must "
7148 "have a location layout qualifier or all "
7149 "members must not have a location layout "
7153 first_member
= false;
7154 first_member_has_explicit_location
=
7155 qual
->flags
.q
.explicit_location
;
7159 if (qual
->flags
.q
.std140
||
7160 qual
->flags
.q
.std430
||
7161 qual
->flags
.q
.packed
||
7162 qual
->flags
.q
.shared
) {
7163 _mesa_glsl_error(&loc
, state
,
7164 "uniform/shader storage block layout qualifiers "
7165 "std140, std430, packed, and shared can only be "
7166 "applied to uniform/shader storage blocks, not "
7170 if (qual
->flags
.q
.constant
) {
7171 _mesa_glsl_error(&loc
, state
,
7172 "const storage qualifier cannot be applied "
7173 "to struct or interface block members");
7176 validate_memory_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7177 validate_image_format_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7179 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
7181 * "A block member may be declared with a stream identifier, but
7182 * the specified stream must match the stream associated with the
7183 * containing block."
7185 if (qual
->flags
.q
.explicit_stream
) {
7186 unsigned qual_stream
;
7187 if (process_qualifier_constant(state
, &loc
, "stream",
7188 qual
->stream
, &qual_stream
) &&
7189 qual_stream
!= block_stream
) {
7190 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
7191 "interface block member does not match "
7192 "the interface block (%u vs %u)", qual_stream
,
7198 unsigned explicit_xfb_buffer
= 0;
7199 if (qual
->flags
.q
.explicit_xfb_buffer
) {
7200 unsigned qual_xfb_buffer
;
7201 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
7202 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
7203 explicit_xfb_buffer
= 1;
7204 if (qual_xfb_buffer
!= block_xfb_buffer
)
7205 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
7206 "interface block member does not match "
7207 "the interface block (%u vs %u)",
7208 qual_xfb_buffer
, block_xfb_buffer
);
7210 xfb_buffer
= (int) qual_xfb_buffer
;
7213 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
7214 xfb_buffer
= (int) block_xfb_buffer
;
7217 int xfb_stride
= -1;
7218 if (qual
->flags
.q
.explicit_xfb_stride
) {
7219 unsigned qual_xfb_stride
;
7220 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
7221 qual
->xfb_stride
, &qual_xfb_stride
)) {
7222 xfb_stride
= (int) qual_xfb_stride
;
7226 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
7227 _mesa_glsl_error(&loc
, state
,
7228 "interpolation qualifiers cannot be used "
7229 "with uniform interface blocks");
7232 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
7233 qual
->has_auxiliary_storage()) {
7234 _mesa_glsl_error(&loc
, state
,
7235 "auxiliary storage qualifiers cannot be used "
7236 "in uniform blocks or structures.");
7239 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
7240 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
7241 _mesa_glsl_error(&loc
, state
,
7242 "row_major and column_major can only be "
7243 "applied to interface blocks");
7245 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
7248 foreach_list_typed (ast_declaration
, decl
, link
,
7249 &decl_list
->declarations
) {
7250 YYLTYPE loc
= decl
->get_location();
7252 if (!allow_reserved_names
)
7253 validate_identifier(decl
->identifier
, loc
, state
);
7255 const struct glsl_type
*field_type
=
7256 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
7257 validate_array_dimensions(field_type
, state
, &loc
);
7258 fields
[i
].type
= field_type
;
7259 fields
[i
].name
= decl
->identifier
;
7260 fields
[i
].interpolation
=
7261 interpret_interpolation_qualifier(qual
, field_type
,
7262 var_mode
, state
, &loc
);
7263 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
7264 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
7265 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
7266 fields
[i
].precision
= qual
->precision
;
7267 fields
[i
].offset
= -1;
7268 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
7269 fields
[i
].xfb_buffer
= xfb_buffer
;
7270 fields
[i
].xfb_stride
= xfb_stride
;
7272 if (qual
->flags
.q
.explicit_location
) {
7273 unsigned qual_location
;
7274 if (process_qualifier_constant(state
, &loc
, "location",
7275 qual
->location
, &qual_location
)) {
7276 fields
[i
].location
= qual_location
+
7277 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
7278 expl_location
= fields
[i
].location
+
7279 fields
[i
].type
->count_attribute_slots(false);
7282 if (layout
&& layout
->flags
.q
.explicit_location
) {
7283 fields
[i
].location
= expl_location
;
7284 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
7286 fields
[i
].location
= -1;
7290 /* Offset can only be used with std430 and std140 layouts an initial
7291 * value of 0 is used for error detection.
7297 if (qual
->flags
.q
.row_major
||
7298 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7304 if(layout
->flags
.q
.std140
) {
7305 align
= field_type
->std140_base_alignment(row_major
);
7306 size
= field_type
->std140_size(row_major
);
7307 } else if (layout
->flags
.q
.std430
) {
7308 align
= field_type
->std430_base_alignment(row_major
);
7309 size
= field_type
->std430_size(row_major
);
7313 if (qual
->flags
.q
.explicit_offset
) {
7314 unsigned qual_offset
;
7315 if (process_qualifier_constant(state
, &loc
, "offset",
7316 qual
->offset
, &qual_offset
)) {
7317 if (align
!= 0 && size
!= 0) {
7318 if (next_offset
> qual_offset
)
7319 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7320 "offset overlaps previous member");
7322 if (qual_offset
% align
) {
7323 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7324 "must be a multiple of the base "
7325 "alignment of %s", field_type
->name
);
7327 fields
[i
].offset
= qual_offset
;
7328 next_offset
= glsl_align(qual_offset
+ size
, align
);
7330 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7331 "with std430 and std140 layouts");
7336 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7337 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7339 if (align
== 0 || size
== 0) {
7340 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7341 "std430 and std140 layouts");
7342 } else if (qual
->flags
.q
.explicit_align
) {
7343 unsigned member_align
;
7344 if (process_qualifier_constant(state
, &loc
, "align",
7345 qual
->align
, &member_align
)) {
7346 if (member_align
== 0 ||
7347 member_align
& (member_align
- 1)) {
7348 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7349 "in not a power of 2");
7351 fields
[i
].offset
= glsl_align(offset
, member_align
);
7352 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7356 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7357 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7359 } else if (!qual
->flags
.q
.explicit_offset
) {
7360 if (align
!= 0 && size
!= 0)
7361 next_offset
= glsl_align(next_offset
+ size
, align
);
7364 /* From the ARB_enhanced_layouts spec:
7366 * "The given offset applies to the first component of the first
7367 * member of the qualified entity. Then, within the qualified
7368 * entity, subsequent components are each assigned, in order, to
7369 * the next available offset aligned to a multiple of that
7370 * component's size. Aggregate types are flattened down to the
7371 * component level to get this sequence of components."
7373 if (qual
->flags
.q
.explicit_xfb_offset
) {
7374 unsigned xfb_offset
;
7375 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7376 qual
->offset
, &xfb_offset
)) {
7377 fields
[i
].offset
= xfb_offset
;
7378 block_xfb_offset
= fields
[i
].offset
+
7379 4 * field_type
->component_slots();
7382 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7383 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7384 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7385 block_xfb_offset
+= 4 * field_type
->component_slots();
7389 /* Propogate row- / column-major information down the fields of the
7390 * structure or interface block. Structures need this data because
7391 * the structure may contain a structure that contains ... a matrix
7392 * that need the proper layout.
7394 if (is_interface
&& layout
&&
7395 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7396 (field_type
->without_array()->is_matrix()
7397 || field_type
->without_array()->is_record())) {
7398 /* If no layout is specified for the field, inherit the layout
7401 fields
[i
].matrix_layout
= matrix_layout
;
7403 if (qual
->flags
.q
.row_major
)
7404 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7405 else if (qual
->flags
.q
.column_major
)
7406 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7408 /* If we're processing an uniform or buffer block, the matrix
7409 * layout must be decided by this point.
7411 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7412 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7415 /* Memory qualifiers are allowed on buffer and image variables, while
7416 * the format qualifier is only accepted for images.
7418 if (var_mode
== ir_var_shader_storage
||
7419 field_type
->without_array()->is_image()) {
7420 /* For readonly and writeonly qualifiers the field definition,
7421 * if set, overwrites the layout qualifier.
7423 if (qual
->flags
.q
.read_only
|| qual
->flags
.q
.write_only
) {
7424 fields
[i
].memory_read_only
= qual
->flags
.q
.read_only
;
7425 fields
[i
].memory_write_only
= qual
->flags
.q
.write_only
;
7427 fields
[i
].memory_read_only
=
7428 layout
? layout
->flags
.q
.read_only
: 0;
7429 fields
[i
].memory_write_only
=
7430 layout
? layout
->flags
.q
.write_only
: 0;
7433 /* For other qualifiers, we set the flag if either the layout
7434 * qualifier or the field qualifier are set
7436 fields
[i
].memory_coherent
= qual
->flags
.q
.coherent
||
7437 (layout
&& layout
->flags
.q
.coherent
);
7438 fields
[i
].memory_volatile
= qual
->flags
.q
._volatile
||
7439 (layout
&& layout
->flags
.q
._volatile
);
7440 fields
[i
].memory_restrict
= qual
->flags
.q
.restrict_flag
||
7441 (layout
&& layout
->flags
.q
.restrict_flag
);
7443 if (field_type
->without_array()->is_image()) {
7444 if (qual
->flags
.q
.explicit_image_format
) {
7445 if (qual
->image_base_type
!=
7446 field_type
->without_array()->sampled_type
) {
7447 _mesa_glsl_error(&loc
, state
, "format qualifier doesn't "
7448 "match the base data type of the image");
7451 fields
[i
].image_format
= qual
->image_format
;
7453 if (!qual
->flags
.q
.write_only
) {
7454 _mesa_glsl_error(&loc
, state
, "image not qualified with "
7455 "`writeonly' must have a format layout "
7459 fields
[i
].image_format
= GL_NONE
;
7468 assert(i
== decl_count
);
7470 *fields_ret
= fields
;
7476 ast_struct_specifier::hir(exec_list
*instructions
,
7477 struct _mesa_glsl_parse_state
*state
)
7479 YYLTYPE loc
= this->get_location();
7481 unsigned expl_location
= 0;
7482 if (layout
&& layout
->flags
.q
.explicit_location
) {
7483 if (!process_qualifier_constant(state
, &loc
, "location",
7484 layout
->location
, &expl_location
)) {
7487 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7491 glsl_struct_field
*fields
;
7492 unsigned decl_count
=
7493 ast_process_struct_or_iface_block_members(instructions
,
7495 &this->declarations
,
7498 GLSL_MATRIX_LAYOUT_INHERITED
,
7499 false /* allow_reserved_names */,
7502 0, /* for interface only */
7503 0, /* for interface only */
7504 0, /* for interface only */
7506 0 /* for interface only */);
7508 validate_identifier(this->name
, loc
, state
);
7510 type
= glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7512 if (!type
->is_anonymous() && !state
->symbols
->add_type(name
, type
)) {
7513 const glsl_type
*match
= state
->symbols
->get_type(name
);
7514 /* allow struct matching for desktop GL - older UE4 does this */
7515 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(type
, false))
7516 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7518 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7520 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7522 state
->num_user_structures
+ 1);
7524 s
[state
->num_user_structures
] = type
;
7525 state
->user_structures
= s
;
7526 state
->num_user_structures
++;
7530 /* Structure type definitions do not have r-values.
7537 * Visitor class which detects whether a given interface block has been used.
7539 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7542 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7543 : mode(mode
), block(block
), found(false)
7547 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7549 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7553 return visit_continue
;
7556 bool usage_found() const
7562 ir_variable_mode mode
;
7563 const glsl_type
*block
;
7568 is_unsized_array_last_element(ir_variable
*v
)
7570 const glsl_type
*interface_type
= v
->get_interface_type();
7571 int length
= interface_type
->length
;
7573 assert(v
->type
->is_unsized_array());
7575 /* Check if it is the last element of the interface */
7576 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7582 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7584 var
->data
.memory_read_only
= field
.memory_read_only
;
7585 var
->data
.memory_write_only
= field
.memory_write_only
;
7586 var
->data
.memory_coherent
= field
.memory_coherent
;
7587 var
->data
.memory_volatile
= field
.memory_volatile
;
7588 var
->data
.memory_restrict
= field
.memory_restrict
;
7592 ast_interface_block::hir(exec_list
*instructions
,
7593 struct _mesa_glsl_parse_state
*state
)
7595 YYLTYPE loc
= this->get_location();
7597 /* Interface blocks must be declared at global scope */
7598 if (state
->current_function
!= NULL
) {
7599 _mesa_glsl_error(&loc
, state
,
7600 "Interface block `%s' must be declared "
7605 /* Validate qualifiers:
7607 * - Layout Qualifiers as per the table in Section 4.4
7608 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7610 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7613 * "Additionally, memory qualifiers may also be used in the declaration
7614 * of shader storage blocks"
7616 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7617 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7618 * Layout Qualifiers) of the GLSL 4.50 spec says:
7620 * "The std430 qualifier is supported only for shader storage blocks;
7621 * using std430 on a uniform block will result in a compile-time error."
7623 ast_type_qualifier allowed_blk_qualifiers
;
7624 allowed_blk_qualifiers
.flags
.i
= 0;
7625 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7626 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7627 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7628 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7629 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7630 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7631 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7632 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7633 if (this->layout
.flags
.q
.buffer
) {
7634 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7635 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7636 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7637 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7638 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7639 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7640 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7642 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7645 /* Interface block */
7646 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7648 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7649 if (this->layout
.flags
.q
.out
) {
7650 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7651 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7652 state
->stage
== MESA_SHADER_TESS_CTRL
||
7653 state
->stage
== MESA_SHADER_TESS_EVAL
||
7654 state
->stage
== MESA_SHADER_VERTEX
) {
7655 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7656 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7657 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7658 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7659 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7660 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7661 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7662 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7664 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7665 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7669 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7670 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7671 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7676 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7677 "invalid qualifier for block",
7680 enum glsl_interface_packing packing
;
7681 if (this->layout
.flags
.q
.std140
) {
7682 packing
= GLSL_INTERFACE_PACKING_STD140
;
7683 } else if (this->layout
.flags
.q
.packed
) {
7684 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7685 } else if (this->layout
.flags
.q
.std430
) {
7686 packing
= GLSL_INTERFACE_PACKING_STD430
;
7688 /* The default layout is shared.
7690 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7693 ir_variable_mode var_mode
;
7694 const char *iface_type_name
;
7695 if (this->layout
.flags
.q
.in
) {
7696 var_mode
= ir_var_shader_in
;
7697 iface_type_name
= "in";
7698 } else if (this->layout
.flags
.q
.out
) {
7699 var_mode
= ir_var_shader_out
;
7700 iface_type_name
= "out";
7701 } else if (this->layout
.flags
.q
.uniform
) {
7702 var_mode
= ir_var_uniform
;
7703 iface_type_name
= "uniform";
7704 } else if (this->layout
.flags
.q
.buffer
) {
7705 var_mode
= ir_var_shader_storage
;
7706 iface_type_name
= "buffer";
7708 var_mode
= ir_var_auto
;
7709 iface_type_name
= "UNKNOWN";
7710 assert(!"interface block layout qualifier not found!");
7713 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7714 if (this->layout
.flags
.q
.row_major
)
7715 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7716 else if (this->layout
.flags
.q
.column_major
)
7717 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7719 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7720 exec_list declared_variables
;
7721 glsl_struct_field
*fields
;
7723 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7724 * that we don't have incompatible qualifiers
7726 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7727 _mesa_glsl_error(&loc
, state
,
7728 "Interface block sets both readonly and writeonly");
7731 unsigned qual_stream
;
7732 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7734 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7735 /* If the stream qualifier is invalid it doesn't make sense to continue
7736 * on and try to compare stream layouts on member variables against it
7737 * so just return early.
7742 unsigned qual_xfb_buffer
;
7743 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7744 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7745 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7749 unsigned qual_xfb_offset
;
7750 if (layout
.flags
.q
.explicit_xfb_offset
) {
7751 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7752 layout
.offset
, &qual_xfb_offset
)) {
7757 unsigned qual_xfb_stride
;
7758 if (layout
.flags
.q
.explicit_xfb_stride
) {
7759 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7760 layout
.xfb_stride
, &qual_xfb_stride
)) {
7765 unsigned expl_location
= 0;
7766 if (layout
.flags
.q
.explicit_location
) {
7767 if (!process_qualifier_constant(state
, &loc
, "location",
7768 layout
.location
, &expl_location
)) {
7771 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7772 : VARYING_SLOT_VAR0
;
7776 unsigned expl_align
= 0;
7777 if (layout
.flags
.q
.explicit_align
) {
7778 if (!process_qualifier_constant(state
, &loc
, "align",
7779 layout
.align
, &expl_align
)) {
7782 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7783 _mesa_glsl_error(&loc
, state
, "align layout qualifier is not a "
7790 unsigned int num_variables
=
7791 ast_process_struct_or_iface_block_members(&declared_variables
,
7793 &this->declarations
,
7797 redeclaring_per_vertex
,
7806 if (!redeclaring_per_vertex
) {
7807 validate_identifier(this->block_name
, loc
, state
);
7809 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7811 * "Block names have no other use within a shader beyond interface
7812 * matching; it is a compile-time error to use a block name at global
7813 * scope for anything other than as a block name."
7815 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7816 if (var
&& !var
->type
->is_interface()) {
7817 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7818 "already used in the scope.",
7823 const glsl_type
*earlier_per_vertex
= NULL
;
7824 if (redeclaring_per_vertex
) {
7825 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7826 * the named interface block gl_in, we can find it by looking at the
7827 * previous declaration of gl_in. Otherwise we can find it by looking
7828 * at the previous decalartion of any of the built-in outputs,
7831 * Also check that the instance name and array-ness of the redeclaration
7835 case ir_var_shader_in
:
7836 if (ir_variable
*earlier_gl_in
=
7837 state
->symbols
->get_variable("gl_in")) {
7838 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7840 _mesa_glsl_error(&loc
, state
,
7841 "redeclaration of gl_PerVertex input not allowed "
7843 _mesa_shader_stage_to_string(state
->stage
));
7845 if (this->instance_name
== NULL
||
7846 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7847 !this->array_specifier
->is_single_dimension()) {
7848 _mesa_glsl_error(&loc
, state
,
7849 "gl_PerVertex input must be redeclared as "
7853 case ir_var_shader_out
:
7854 if (ir_variable
*earlier_gl_Position
=
7855 state
->symbols
->get_variable("gl_Position")) {
7856 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7857 } else if (ir_variable
*earlier_gl_out
=
7858 state
->symbols
->get_variable("gl_out")) {
7859 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7861 _mesa_glsl_error(&loc
, state
,
7862 "redeclaration of gl_PerVertex output not "
7863 "allowed in the %s shader",
7864 _mesa_shader_stage_to_string(state
->stage
));
7866 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7867 if (this->instance_name
== NULL
||
7868 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7869 _mesa_glsl_error(&loc
, state
,
7870 "gl_PerVertex output must be redeclared as "
7874 if (this->instance_name
!= NULL
) {
7875 _mesa_glsl_error(&loc
, state
,
7876 "gl_PerVertex output may not be redeclared with "
7877 "an instance name");
7882 _mesa_glsl_error(&loc
, state
,
7883 "gl_PerVertex must be declared as an input or an "
7888 if (earlier_per_vertex
== NULL
) {
7889 /* An error has already been reported. Bail out to avoid null
7890 * dereferences later in this function.
7895 /* Copy locations from the old gl_PerVertex interface block. */
7896 for (unsigned i
= 0; i
< num_variables
; i
++) {
7897 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7899 _mesa_glsl_error(&loc
, state
,
7900 "redeclaration of gl_PerVertex must be a subset "
7901 "of the built-in members of gl_PerVertex");
7903 fields
[i
].location
=
7904 earlier_per_vertex
->fields
.structure
[j
].location
;
7906 earlier_per_vertex
->fields
.structure
[j
].offset
;
7907 fields
[i
].interpolation
=
7908 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7909 fields
[i
].centroid
=
7910 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7912 earlier_per_vertex
->fields
.structure
[j
].sample
;
7914 earlier_per_vertex
->fields
.structure
[j
].patch
;
7915 fields
[i
].precision
=
7916 earlier_per_vertex
->fields
.structure
[j
].precision
;
7917 fields
[i
].explicit_xfb_buffer
=
7918 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7919 fields
[i
].xfb_buffer
=
7920 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7921 fields
[i
].xfb_stride
=
7922 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7926 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7929 * If a built-in interface block is redeclared, it must appear in
7930 * the shader before any use of any member included in the built-in
7931 * declaration, or a compilation error will result.
7933 * This appears to be a clarification to the behaviour established for
7934 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7935 * regardless of GLSL version.
7937 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7938 v
.run(instructions
);
7939 if (v
.usage_found()) {
7940 _mesa_glsl_error(&loc
, state
,
7941 "redeclaration of a built-in interface block must "
7942 "appear before any use of any member of the "
7947 const glsl_type
*block_type
=
7948 glsl_type::get_interface_instance(fields
,
7952 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7955 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7957 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7958 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7961 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7962 YYLTYPE loc
= this->get_location();
7963 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7964 "already taken in the current scope",
7965 this->block_name
, iface_type_name
);
7968 /* Since interface blocks cannot contain statements, it should be
7969 * impossible for the block to generate any instructions.
7971 assert(declared_variables
.is_empty());
7973 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7975 * Geometry shader input variables get the per-vertex values written
7976 * out by vertex shader output variables of the same names. Since a
7977 * geometry shader operates on a set of vertices, each input varying
7978 * variable (or input block, see interface blocks below) needs to be
7979 * declared as an array.
7981 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7982 var_mode
== ir_var_shader_in
) {
7983 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7984 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7985 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7986 !this->layout
.flags
.q
.patch
&&
7987 this->array_specifier
== NULL
&&
7988 var_mode
== ir_var_shader_in
) {
7989 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7990 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7991 !this->layout
.flags
.q
.patch
&&
7992 this->array_specifier
== NULL
&&
7993 var_mode
== ir_var_shader_out
) {
7994 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7998 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
8001 * "If an instance name (instance-name) is used, then it puts all the
8002 * members inside a scope within its own name space, accessed with the
8003 * field selector ( . ) operator (analogously to structures)."
8005 if (this->instance_name
) {
8006 if (redeclaring_per_vertex
) {
8007 /* When a built-in in an unnamed interface block is redeclared,
8008 * get_variable_being_redeclared() calls
8009 * check_builtin_array_max_size() to make sure that built-in array
8010 * variables aren't redeclared to illegal sizes. But we're looking
8011 * at a redeclaration of a named built-in interface block. So we
8012 * have to manually call check_builtin_array_max_size() for all parts
8013 * of the interface that are arrays.
8015 for (unsigned i
= 0; i
< num_variables
; i
++) {
8016 if (fields
[i
].type
->is_array()) {
8017 const unsigned size
= fields
[i
].type
->array_size();
8018 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
8022 validate_identifier(this->instance_name
, loc
, state
);
8027 if (this->array_specifier
!= NULL
) {
8028 const glsl_type
*block_array_type
=
8029 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
8031 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
8033 * For uniform blocks declared an array, each individual array
8034 * element corresponds to a separate buffer object backing one
8035 * instance of the block. As the array size indicates the number
8036 * of buffer objects needed, uniform block array declarations
8037 * must specify an array size.
8039 * And a few paragraphs later:
8041 * Geometry shader input blocks must be declared as arrays and
8042 * follow the array declaration and linking rules for all
8043 * geometry shader inputs. All other input and output block
8044 * arrays must specify an array size.
8046 * The same applies to tessellation shaders.
8048 * The upshot of this is that the only circumstance where an
8049 * interface array size *doesn't* need to be specified is on a
8050 * geometry shader input, tessellation control shader input,
8051 * tessellation control shader output, and tessellation evaluation
8054 if (block_array_type
->is_unsized_array()) {
8055 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
8056 state
->stage
== MESA_SHADER_TESS_CTRL
||
8057 state
->stage
== MESA_SHADER_TESS_EVAL
;
8058 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
8060 if (this->layout
.flags
.q
.in
) {
8062 _mesa_glsl_error(&loc
, state
,
8063 "unsized input block arrays not allowed in "
8065 _mesa_shader_stage_to_string(state
->stage
));
8066 } else if (this->layout
.flags
.q
.out
) {
8068 _mesa_glsl_error(&loc
, state
,
8069 "unsized output block arrays not allowed in "
8071 _mesa_shader_stage_to_string(state
->stage
));
8073 /* by elimination, this is a uniform block array */
8074 _mesa_glsl_error(&loc
, state
,
8075 "unsized uniform block arrays not allowed in "
8077 _mesa_shader_stage_to_string(state
->stage
));
8081 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
8083 * * Arrays of arrays of blocks are not allowed
8085 if (state
->es_shader
&& block_array_type
->is_array() &&
8086 block_array_type
->fields
.array
->is_array()) {
8087 _mesa_glsl_error(&loc
, state
,
8088 "arrays of arrays interface blocks are "
8092 var
= new(state
) ir_variable(block_array_type
,
8093 this->instance_name
,
8096 var
= new(state
) ir_variable(block_type
,
8097 this->instance_name
,
8101 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8102 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8104 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8105 var
->data
.read_only
= true;
8107 var
->data
.patch
= this->layout
.flags
.q
.patch
;
8109 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
8110 handle_geometry_shader_input_decl(state
, loc
, var
);
8111 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8112 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
8113 handle_tess_shader_input_decl(state
, loc
, var
);
8114 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
8115 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
8117 for (unsigned i
= 0; i
< num_variables
; i
++) {
8118 if (var
->data
.mode
== ir_var_shader_storage
)
8119 apply_memory_qualifiers(var
, fields
[i
]);
8122 if (ir_variable
*earlier
=
8123 state
->symbols
->get_variable(this->instance_name
)) {
8124 if (!redeclaring_per_vertex
) {
8125 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
8126 this->instance_name
);
8128 earlier
->data
.how_declared
= ir_var_declared_normally
;
8129 earlier
->type
= var
->type
;
8130 earlier
->reinit_interface_type(block_type
);
8133 if (this->layout
.flags
.q
.explicit_binding
) {
8134 apply_explicit_binding(state
, &loc
, var
, var
->type
,
8138 var
->data
.stream
= qual_stream
;
8139 if (layout
.flags
.q
.explicit_location
) {
8140 var
->data
.location
= expl_location
;
8141 var
->data
.explicit_location
= true;
8144 state
->symbols
->add_variable(var
);
8145 instructions
->push_tail(var
);
8148 /* In order to have an array size, the block must also be declared with
8151 assert(this->array_specifier
== NULL
);
8153 for (unsigned i
= 0; i
< num_variables
; i
++) {
8155 new(state
) ir_variable(fields
[i
].type
,
8156 ralloc_strdup(state
, fields
[i
].name
),
8158 var
->data
.interpolation
= fields
[i
].interpolation
;
8159 var
->data
.centroid
= fields
[i
].centroid
;
8160 var
->data
.sample
= fields
[i
].sample
;
8161 var
->data
.patch
= fields
[i
].patch
;
8162 var
->data
.stream
= qual_stream
;
8163 var
->data
.location
= fields
[i
].location
;
8165 if (fields
[i
].location
!= -1)
8166 var
->data
.explicit_location
= true;
8168 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
8169 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
8171 if (fields
[i
].offset
!= -1)
8172 var
->data
.explicit_xfb_offset
= true;
8173 var
->data
.offset
= fields
[i
].offset
;
8175 var
->init_interface_type(block_type
);
8177 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8178 var
->data
.read_only
= true;
8180 /* Precision qualifiers do not have any meaning in Desktop GLSL */
8181 if (state
->es_shader
) {
8182 var
->data
.precision
=
8183 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
8187 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
8188 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8189 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8191 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
8194 if (var
->data
.mode
== ir_var_shader_storage
)
8195 apply_memory_qualifiers(var
, fields
[i
]);
8197 /* Examine var name here since var may get deleted in the next call */
8198 bool var_is_gl_id
= is_gl_identifier(var
->name
);
8200 if (redeclaring_per_vertex
) {
8201 bool is_redeclaration
;
8203 get_variable_being_redeclared(&var
, loc
, state
,
8204 true /* allow_all_redeclarations */,
8206 if (!var_is_gl_id
|| !is_redeclaration
) {
8207 _mesa_glsl_error(&loc
, state
,
8208 "redeclaration of gl_PerVertex can only "
8209 "include built-in variables");
8210 } else if (var
->data
.how_declared
== ir_var_declared_normally
) {
8211 _mesa_glsl_error(&loc
, state
,
8212 "`%s' has already been redeclared",
8215 var
->data
.how_declared
= ir_var_declared_in_block
;
8216 var
->reinit_interface_type(block_type
);
8221 if (state
->symbols
->get_variable(var
->name
) != NULL
)
8222 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
8224 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
8225 * The UBO declaration itself doesn't get an ir_variable unless it
8226 * has an instance name. This is ugly.
8228 if (this->layout
.flags
.q
.explicit_binding
) {
8229 apply_explicit_binding(state
, &loc
, var
,
8230 var
->get_interface_type(), &this->layout
);
8233 if (var
->type
->is_unsized_array()) {
8234 if (var
->is_in_shader_storage_block() &&
8235 is_unsized_array_last_element(var
)) {
8236 var
->data
.from_ssbo_unsized_array
= true;
8238 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
8240 * "If an array is declared as the last member of a shader storage
8241 * block and the size is not specified at compile-time, it is
8242 * sized at run-time. In all other cases, arrays are sized only
8245 * In desktop GLSL it is allowed to have unsized-arrays that are
8246 * not last, as long as we can determine that they are implicitly
8249 if (state
->es_shader
) {
8250 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
8251 "definition: only last member of a shader "
8252 "storage block can be defined as unsized "
8253 "array", fields
[i
].name
);
8258 state
->symbols
->add_variable(var
);
8259 instructions
->push_tail(var
);
8262 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
8263 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
8265 * It is also a compilation error ... to redeclare a built-in
8266 * block and then use a member from that built-in block that was
8267 * not included in the redeclaration.
8269 * This appears to be a clarification to the behaviour established
8270 * for gl_PerVertex by GLSL 1.50, therefore we implement this
8271 * behaviour regardless of GLSL version.
8273 * To prevent the shader from using a member that was not included in
8274 * the redeclaration, we disable any ir_variables that are still
8275 * associated with the old declaration of gl_PerVertex (since we've
8276 * already updated all of the variables contained in the new
8277 * gl_PerVertex to point to it).
8279 * As a side effect this will prevent
8280 * validate_intrastage_interface_blocks() from getting confused and
8281 * thinking there are conflicting definitions of gl_PerVertex in the
8284 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8285 ir_variable
*const var
= node
->as_variable();
8287 var
->get_interface_type() == earlier_per_vertex
&&
8288 var
->data
.mode
== var_mode
) {
8289 if (var
->data
.how_declared
== ir_var_declared_normally
) {
8290 _mesa_glsl_error(&loc
, state
,
8291 "redeclaration of gl_PerVertex cannot "
8292 "follow a redeclaration of `%s'",
8295 state
->symbols
->disable_variable(var
->name
);
8307 ast_tcs_output_layout::hir(exec_list
*instructions
,
8308 struct _mesa_glsl_parse_state
*state
)
8310 YYLTYPE loc
= this->get_location();
8312 unsigned num_vertices
;
8313 if (!state
->out_qualifier
->vertices
->
8314 process_qualifier_constant(state
, "vertices", &num_vertices
,
8316 /* return here to stop cascading incorrect error messages */
8320 /* If any shader outputs occurred before this declaration and specified an
8321 * array size, make sure the size they specified is consistent with the
8324 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8325 _mesa_glsl_error(&loc
, state
,
8326 "this tessellation control shader output layout "
8327 "specifies %u vertices, but a previous output "
8328 "is declared with size %u",
8329 num_vertices
, state
->tcs_output_size
);
8333 state
->tcs_output_vertices_specified
= true;
8335 /* If any shader outputs occurred before this declaration and did not
8336 * specify an array size, their size is determined now.
8338 foreach_in_list (ir_instruction
, node
, instructions
) {
8339 ir_variable
*var
= node
->as_variable();
8340 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8343 /* Note: Not all tessellation control shader output are arrays. */
8344 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8347 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8348 _mesa_glsl_error(&loc
, state
,
8349 "this tessellation control shader output layout "
8350 "specifies %u vertices, but an access to element "
8351 "%u of output `%s' already exists", num_vertices
,
8352 var
->data
.max_array_access
, var
->name
);
8354 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8364 ast_gs_input_layout::hir(exec_list
*instructions
,
8365 struct _mesa_glsl_parse_state
*state
)
8367 YYLTYPE loc
= this->get_location();
8369 /* Should have been prevented by the parser. */
8370 assert(!state
->gs_input_prim_type_specified
8371 || state
->in_qualifier
->prim_type
== this->prim_type
);
8373 /* If any shader inputs occurred before this declaration and specified an
8374 * array size, make sure the size they specified is consistent with the
8377 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8378 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8379 _mesa_glsl_error(&loc
, state
,
8380 "this geometry shader input layout implies %u vertices"
8381 " per primitive, but a previous input is declared"
8382 " with size %u", num_vertices
, state
->gs_input_size
);
8386 state
->gs_input_prim_type_specified
= true;
8388 /* If any shader inputs occurred before this declaration and did not
8389 * specify an array size, their size is determined now.
8391 foreach_in_list(ir_instruction
, node
, instructions
) {
8392 ir_variable
*var
= node
->as_variable();
8393 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8396 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8400 if (var
->type
->is_unsized_array()) {
8401 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8402 _mesa_glsl_error(&loc
, state
,
8403 "this geometry shader input layout implies %u"
8404 " vertices, but an access to element %u of input"
8405 " `%s' already exists", num_vertices
,
8406 var
->data
.max_array_access
, var
->name
);
8408 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8419 ast_cs_input_layout::hir(exec_list
*instructions
,
8420 struct _mesa_glsl_parse_state
*state
)
8422 YYLTYPE loc
= this->get_location();
8424 /* From the ARB_compute_shader specification:
8426 * If the local size of the shader in any dimension is greater
8427 * than the maximum size supported by the implementation for that
8428 * dimension, a compile-time error results.
8430 * It is not clear from the spec how the error should be reported if
8431 * the total size of the work group exceeds
8432 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8433 * report it at compile time as well.
8435 GLuint64 total_invocations
= 1;
8436 unsigned qual_local_size
[3];
8437 for (int i
= 0; i
< 3; i
++) {
8439 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8441 /* Infer a local_size of 1 for unspecified dimensions */
8442 if (this->local_size
[i
] == NULL
) {
8443 qual_local_size
[i
] = 1;
8444 } else if (!this->local_size
[i
]->
8445 process_qualifier_constant(state
, local_size_str
,
8446 &qual_local_size
[i
], false)) {
8447 ralloc_free(local_size_str
);
8450 ralloc_free(local_size_str
);
8452 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8453 _mesa_glsl_error(&loc
, state
,
8454 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8456 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8459 total_invocations
*= qual_local_size
[i
];
8460 if (total_invocations
>
8461 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8462 _mesa_glsl_error(&loc
, state
,
8463 "product of local_sizes exceeds "
8464 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8465 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8470 /* If any compute input layout declaration preceded this one, make sure it
8471 * was consistent with this one.
8473 if (state
->cs_input_local_size_specified
) {
8474 for (int i
= 0; i
< 3; i
++) {
8475 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8476 _mesa_glsl_error(&loc
, state
,
8477 "compute shader input layout does not match"
8478 " previous declaration");
8484 /* The ARB_compute_variable_group_size spec says:
8486 * If a compute shader including a *local_size_variable* qualifier also
8487 * declares a fixed local group size using the *local_size_x*,
8488 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8491 if (state
->cs_input_local_size_variable_specified
) {
8492 _mesa_glsl_error(&loc
, state
,
8493 "compute shader can't include both a variable and a "
8494 "fixed local group size");
8498 state
->cs_input_local_size_specified
= true;
8499 for (int i
= 0; i
< 3; i
++)
8500 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8502 /* We may now declare the built-in constant gl_WorkGroupSize (see
8503 * builtin_variable_generator::generate_constants() for why we didn't
8504 * declare it earlier).
8506 ir_variable
*var
= new(state
->symbols
)
8507 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8508 var
->data
.how_declared
= ir_var_declared_implicitly
;
8509 var
->data
.read_only
= true;
8510 instructions
->push_tail(var
);
8511 state
->symbols
->add_variable(var
);
8512 ir_constant_data data
;
8513 memset(&data
, 0, sizeof(data
));
8514 for (int i
= 0; i
< 3; i
++)
8515 data
.u
[i
] = qual_local_size
[i
];
8516 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8517 var
->constant_initializer
=
8518 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8519 var
->data
.has_initializer
= true;
8526 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8527 exec_list
*instructions
)
8529 bool gl_FragColor_assigned
= false;
8530 bool gl_FragData_assigned
= false;
8531 bool gl_FragSecondaryColor_assigned
= false;
8532 bool gl_FragSecondaryData_assigned
= false;
8533 bool user_defined_fs_output_assigned
= false;
8534 ir_variable
*user_defined_fs_output
= NULL
;
8536 /* It would be nice to have proper location information. */
8538 memset(&loc
, 0, sizeof(loc
));
8540 foreach_in_list(ir_instruction
, node
, instructions
) {
8541 ir_variable
*var
= node
->as_variable();
8543 if (!var
|| !var
->data
.assigned
)
8546 if (strcmp(var
->name
, "gl_FragColor") == 0)
8547 gl_FragColor_assigned
= true;
8548 else if (strcmp(var
->name
, "gl_FragData") == 0)
8549 gl_FragData_assigned
= true;
8550 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8551 gl_FragSecondaryColor_assigned
= true;
8552 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8553 gl_FragSecondaryData_assigned
= true;
8554 else if (!is_gl_identifier(var
->name
)) {
8555 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8556 var
->data
.mode
== ir_var_shader_out
) {
8557 user_defined_fs_output_assigned
= true;
8558 user_defined_fs_output
= var
;
8563 /* From the GLSL 1.30 spec:
8565 * "If a shader statically assigns a value to gl_FragColor, it
8566 * may not assign a value to any element of gl_FragData. If a
8567 * shader statically writes a value to any element of
8568 * gl_FragData, it may not assign a value to
8569 * gl_FragColor. That is, a shader may assign values to either
8570 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8571 * linked together must also consistently write just one of
8572 * these variables. Similarly, if user declared output
8573 * variables are in use (statically assigned to), then the
8574 * built-in variables gl_FragColor and gl_FragData may not be
8575 * assigned to. These incorrect usages all generate compile
8578 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8579 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8580 "`gl_FragColor' and `gl_FragData'");
8581 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8582 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8583 "`gl_FragColor' and `%s'",
8584 user_defined_fs_output
->name
);
8585 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8586 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8587 "`gl_FragSecondaryColorEXT' and"
8588 " `gl_FragSecondaryDataEXT'");
8589 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8590 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8591 "`gl_FragColor' and"
8592 " `gl_FragSecondaryDataEXT'");
8593 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8594 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8596 " `gl_FragSecondaryColorEXT'");
8597 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8598 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8599 "`gl_FragData' and `%s'",
8600 user_defined_fs_output
->name
);
8603 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8604 !state
->EXT_blend_func_extended_enable
) {
8605 _mesa_glsl_error(&loc
, state
,
8606 "Dual source blending requires EXT_blend_func_extended");
8612 remove_per_vertex_blocks(exec_list
*instructions
,
8613 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8615 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8616 * if it exists in this shader type.
8618 const glsl_type
*per_vertex
= NULL
;
8620 case ir_var_shader_in
:
8621 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8622 per_vertex
= gl_in
->get_interface_type();
8624 case ir_var_shader_out
:
8625 if (ir_variable
*gl_Position
=
8626 state
->symbols
->get_variable("gl_Position")) {
8627 per_vertex
= gl_Position
->get_interface_type();
8631 assert(!"Unexpected mode");
8635 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8636 * need to do anything.
8638 if (per_vertex
== NULL
)
8641 /* If the interface block is used by the shader, then we don't need to do
8644 interface_block_usage_visitor
v(mode
, per_vertex
);
8645 v
.run(instructions
);
8646 if (v
.usage_found())
8649 /* Remove any ir_variable declarations that refer to the interface block
8652 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8653 ir_variable
*const var
= node
->as_variable();
8654 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8655 var
->data
.mode
== mode
) {
8656 state
->symbols
->disable_variable(var
->name
);