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_FLOAT16
:
1112 case GLSL_TYPE_UINT
:
1114 case GLSL_TYPE_BOOL
:
1115 case GLSL_TYPE_DOUBLE
:
1116 case GLSL_TYPE_UINT64
:
1117 case GLSL_TYPE_INT64
:
1118 case GLSL_TYPE_UINT16
:
1119 case GLSL_TYPE_INT16
:
1120 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1122 case GLSL_TYPE_ARRAY
: {
1123 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1124 ir_rvalue
*e0
, *e1
, *result
;
1126 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1127 new(mem_ctx
) ir_constant(i
));
1128 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1129 new(mem_ctx
) ir_constant(i
));
1130 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1133 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1139 mark_whole_array_access(op0
);
1140 mark_whole_array_access(op1
);
1144 case GLSL_TYPE_STRUCT
: {
1145 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1146 ir_rvalue
*e0
, *e1
, *result
;
1147 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1149 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1151 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1153 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1156 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1164 case GLSL_TYPE_ERROR
:
1165 case GLSL_TYPE_VOID
:
1166 case GLSL_TYPE_SAMPLER
:
1167 case GLSL_TYPE_IMAGE
:
1168 case GLSL_TYPE_INTERFACE
:
1169 case GLSL_TYPE_ATOMIC_UINT
:
1170 case GLSL_TYPE_SUBROUTINE
:
1171 case GLSL_TYPE_FUNCTION
:
1172 /* I assume a comparison of a struct containing a sampler just
1173 * ignores the sampler present in the type.
1179 cmp
= new(mem_ctx
) ir_constant(true);
1184 /* For logical operations, we want to ensure that the operands are
1185 * scalar booleans. If it isn't, emit an error and return a constant
1186 * boolean to avoid triggering cascading error messages.
1189 get_scalar_boolean_operand(exec_list
*instructions
,
1190 struct _mesa_glsl_parse_state
*state
,
1191 ast_expression
*parent_expr
,
1193 const char *operand_name
,
1194 bool *error_emitted
)
1196 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1198 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1200 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1203 if (!*error_emitted
) {
1204 YYLTYPE loc
= expr
->get_location();
1205 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1207 parent_expr
->operator_string(parent_expr
->oper
));
1208 *error_emitted
= true;
1211 return new(ctx
) ir_constant(true);
1215 * If name refers to a builtin array whose maximum allowed size is less than
1216 * size, report an error and return true. Otherwise return false.
1219 check_builtin_array_max_size(const char *name
, unsigned size
,
1220 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1222 if ((strcmp("gl_TexCoord", name
) == 0)
1223 && (size
> state
->Const
.MaxTextureCoords
)) {
1224 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1226 * "The size [of gl_TexCoord] can be at most
1227 * gl_MaxTextureCoords."
1229 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1230 "be larger than gl_MaxTextureCoords (%u)",
1231 state
->Const
.MaxTextureCoords
);
1232 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1233 state
->clip_dist_size
= size
;
1234 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1235 /* From section 7.1 (Vertex Shader Special Variables) of the
1238 * "The gl_ClipDistance array is predeclared as unsized and
1239 * must be sized by the shader either redeclaring it with a
1240 * size or indexing it only with integral constant
1241 * expressions. ... The size can be at most
1242 * gl_MaxClipDistances."
1244 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1245 "be larger than gl_MaxClipDistances (%u)",
1246 state
->Const
.MaxClipPlanes
);
1248 } else if (strcmp("gl_CullDistance", name
) == 0) {
1249 state
->cull_dist_size
= size
;
1250 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1251 /* From the ARB_cull_distance spec:
1253 * "The gl_CullDistance array is predeclared as unsized and
1254 * must be sized by the shader either redeclaring it with
1255 * a size or indexing it only with integral constant
1256 * expressions. The size determines the number and set of
1257 * enabled cull distances and can be at most
1258 * gl_MaxCullDistances."
1260 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1261 "be larger than gl_MaxCullDistances (%u)",
1262 state
->Const
.MaxClipPlanes
);
1268 * Create the constant 1, of a which is appropriate for incrementing and
1269 * decrementing values of the given GLSL type. For example, if type is vec4,
1270 * this creates a constant value of 1.0 having type float.
1272 * If the given type is invalid for increment and decrement operators, return
1273 * a floating point 1--the error will be detected later.
1276 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1278 switch (type
->base_type
) {
1279 case GLSL_TYPE_UINT
:
1280 return new(ctx
) ir_constant((unsigned) 1);
1282 return new(ctx
) ir_constant(1);
1283 case GLSL_TYPE_UINT64
:
1284 return new(ctx
) ir_constant((uint64_t) 1);
1285 case GLSL_TYPE_INT64
:
1286 return new(ctx
) ir_constant((int64_t) 1);
1288 case GLSL_TYPE_FLOAT
:
1289 return new(ctx
) ir_constant(1.0f
);
1294 ast_expression::hir(exec_list
*instructions
,
1295 struct _mesa_glsl_parse_state
*state
)
1297 return do_hir(instructions
, state
, true);
1301 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1302 struct _mesa_glsl_parse_state
*state
)
1304 do_hir(instructions
, state
, false);
1308 ast_expression::set_is_lhs(bool new_value
)
1310 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1311 * if we lack an identifier we can just skip it.
1313 if (this->primary_expression
.identifier
== NULL
)
1316 this->is_lhs
= new_value
;
1318 /* We need to go through the subexpressions tree to cover cases like
1319 * ast_field_selection
1321 if (this->subexpressions
[0] != NULL
)
1322 this->subexpressions
[0]->set_is_lhs(new_value
);
1326 ast_expression::do_hir(exec_list
*instructions
,
1327 struct _mesa_glsl_parse_state
*state
,
1331 static const int operations
[AST_NUM_OPERATORS
] = {
1332 -1, /* ast_assign doesn't convert to ir_expression. */
1333 -1, /* ast_plus doesn't convert to ir_expression. */
1343 ir_binop_less
, /* This is correct. See the ast_greater case below. */
1344 ir_binop_gequal
, /* This is correct. See the ast_lequal case below. */
1347 ir_binop_any_nequal
,
1357 /* Note: The following block of expression types actually convert
1358 * to multiple IR instructions.
1360 ir_binop_mul
, /* ast_mul_assign */
1361 ir_binop_div
, /* ast_div_assign */
1362 ir_binop_mod
, /* ast_mod_assign */
1363 ir_binop_add
, /* ast_add_assign */
1364 ir_binop_sub
, /* ast_sub_assign */
1365 ir_binop_lshift
, /* ast_ls_assign */
1366 ir_binop_rshift
, /* ast_rs_assign */
1367 ir_binop_bit_and
, /* ast_and_assign */
1368 ir_binop_bit_xor
, /* ast_xor_assign */
1369 ir_binop_bit_or
, /* ast_or_assign */
1371 -1, /* ast_conditional doesn't convert to ir_expression. */
1372 ir_binop_add
, /* ast_pre_inc. */
1373 ir_binop_sub
, /* ast_pre_dec. */
1374 ir_binop_add
, /* ast_post_inc. */
1375 ir_binop_sub
, /* ast_post_dec. */
1376 -1, /* ast_field_selection doesn't conv to ir_expression. */
1377 -1, /* ast_array_index doesn't convert to ir_expression. */
1378 -1, /* ast_function_call doesn't conv to ir_expression. */
1379 -1, /* ast_identifier doesn't convert to ir_expression. */
1380 -1, /* ast_int_constant doesn't convert to ir_expression. */
1381 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1382 -1, /* ast_float_constant doesn't conv to ir_expression. */
1383 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1384 -1, /* ast_sequence doesn't convert to ir_expression. */
1385 -1, /* ast_aggregate shouldn't ever even get here. */
1387 ir_rvalue
*result
= NULL
;
1389 const struct glsl_type
*type
, *orig_type
;
1390 bool error_emitted
= false;
1393 loc
= this->get_location();
1395 switch (this->oper
) {
1397 assert(!"ast_aggregate: Should never get here.");
1401 this->subexpressions
[0]->set_is_lhs(true);
1402 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1403 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1406 do_assignment(instructions
, state
,
1407 this->subexpressions
[0]->non_lvalue_description
,
1408 op
[0], op
[1], &result
, needs_rvalue
, false,
1409 this->subexpressions
[0]->get_location());
1414 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1416 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1418 error_emitted
= type
->is_error();
1424 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1426 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1428 error_emitted
= type
->is_error();
1430 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1438 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1439 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1441 type
= arithmetic_result_type(op
[0], op
[1],
1442 (this->oper
== ast_mul
),
1444 error_emitted
= type
->is_error();
1446 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1451 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1452 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1454 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1456 assert(operations
[this->oper
] == ir_binop_mod
);
1458 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1460 error_emitted
= type
->is_error();
1465 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1466 error_emitted
= true;
1469 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1470 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1471 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1473 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1475 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1482 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1483 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1485 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1487 /* The relational operators must either generate an error or result
1488 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1490 assert(type
->is_error()
1491 || (type
->is_boolean() && type
->is_scalar()));
1493 /* Like NIR, GLSL IR does not have opcodes for > or <=. Instead, swap
1494 * the arguments and use < or >=.
1496 if (this->oper
== ast_greater
|| this->oper
== ast_lequal
) {
1497 ir_rvalue
*const tmp
= op
[0];
1502 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1504 error_emitted
= type
->is_error();
1509 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1510 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1512 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1514 * "The equality operators equal (==), and not equal (!=)
1515 * operate on all types. They result in a scalar Boolean. If
1516 * the operand types do not match, then there must be a
1517 * conversion from Section 4.1.10 "Implicit Conversions"
1518 * applied to one operand that can make them match, in which
1519 * case this conversion is done."
1522 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1523 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1524 "no operation `%1$s' exists that takes a left-hand "
1525 "operand of type 'void' or a right operand of type "
1526 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1527 error_emitted
= true;
1528 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1529 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1530 || (op
[0]->type
!= op
[1]->type
)) {
1531 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1532 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1533 error_emitted
= true;
1534 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1535 !state
->check_version(120, 300, &loc
,
1536 "array comparisons forbidden")) {
1537 error_emitted
= true;
1538 } else if ((op
[0]->type
->contains_subroutine() ||
1539 op
[1]->type
->contains_subroutine())) {
1540 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1541 error_emitted
= true;
1542 } else if ((op
[0]->type
->contains_opaque() ||
1543 op
[1]->type
->contains_opaque())) {
1544 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1545 error_emitted
= true;
1548 if (error_emitted
) {
1549 result
= new(ctx
) ir_constant(false);
1551 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1552 assert(result
->type
== glsl_type::bool_type
);
1559 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1560 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1561 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1562 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1564 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1568 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1570 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1571 error_emitted
= true;
1574 if (!op
[0]->type
->is_integer_32_64()) {
1575 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1576 error_emitted
= true;
1579 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1580 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1583 case ast_logic_and
: {
1584 exec_list rhs_instructions
;
1585 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1586 "LHS", &error_emitted
);
1587 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1588 "RHS", &error_emitted
);
1590 if (rhs_instructions
.is_empty()) {
1591 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1593 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1596 instructions
->push_tail(tmp
);
1598 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1599 instructions
->push_tail(stmt
);
1601 stmt
->then_instructions
.append_list(&rhs_instructions
);
1602 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1603 ir_assignment
*const then_assign
=
1604 new(ctx
) ir_assignment(then_deref
, op
[1]);
1605 stmt
->then_instructions
.push_tail(then_assign
);
1607 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1608 ir_assignment
*const else_assign
=
1609 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1610 stmt
->else_instructions
.push_tail(else_assign
);
1612 result
= new(ctx
) ir_dereference_variable(tmp
);
1617 case ast_logic_or
: {
1618 exec_list rhs_instructions
;
1619 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1620 "LHS", &error_emitted
);
1621 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1622 "RHS", &error_emitted
);
1624 if (rhs_instructions
.is_empty()) {
1625 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
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
);
1652 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1654 * "The logical binary operators and (&&), or ( | | ), and
1655 * exclusive or (^^). They operate only on two Boolean
1656 * expressions and result in a Boolean expression."
1658 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1660 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1663 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1668 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1669 "operand", &error_emitted
);
1671 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1675 case ast_mul_assign
:
1676 case ast_div_assign
:
1677 case ast_add_assign
:
1678 case ast_sub_assign
: {
1679 this->subexpressions
[0]->set_is_lhs(true);
1680 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1681 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1683 orig_type
= op
[0]->type
;
1684 type
= arithmetic_result_type(op
[0], op
[1],
1685 (this->oper
== ast_mul_assign
),
1688 if (type
!= orig_type
) {
1689 _mesa_glsl_error(& loc
, state
,
1690 "could not implicitly convert "
1691 "%s to %s", type
->name
, orig_type
->name
);
1692 type
= glsl_type::error_type
;
1695 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1699 do_assignment(instructions
, state
,
1700 this->subexpressions
[0]->non_lvalue_description
,
1701 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1702 &result
, needs_rvalue
, false,
1703 this->subexpressions
[0]->get_location());
1705 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1706 * explicitly test for this because none of the binary expression
1707 * operators allow array operands either.
1713 case ast_mod_assign
: {
1714 this->subexpressions
[0]->set_is_lhs(true);
1715 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1716 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1718 orig_type
= op
[0]->type
;
1719 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1721 if (type
!= orig_type
) {
1722 _mesa_glsl_error(& loc
, state
,
1723 "could not implicitly convert "
1724 "%s to %s", type
->name
, orig_type
->name
);
1725 type
= glsl_type::error_type
;
1728 assert(operations
[this->oper
] == ir_binop_mod
);
1730 ir_rvalue
*temp_rhs
;
1731 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1735 do_assignment(instructions
, state
,
1736 this->subexpressions
[0]->non_lvalue_description
,
1737 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1738 &result
, needs_rvalue
, false,
1739 this->subexpressions
[0]->get_location());
1744 case ast_rs_assign
: {
1745 this->subexpressions
[0]->set_is_lhs(true);
1746 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1747 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1748 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1750 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1751 type
, op
[0], op
[1]);
1753 do_assignment(instructions
, state
,
1754 this->subexpressions
[0]->non_lvalue_description
,
1755 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1756 &result
, needs_rvalue
, false,
1757 this->subexpressions
[0]->get_location());
1761 case ast_and_assign
:
1762 case ast_xor_assign
:
1763 case ast_or_assign
: {
1764 this->subexpressions
[0]->set_is_lhs(true);
1765 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1766 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1768 orig_type
= op
[0]->type
;
1769 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1771 if (type
!= orig_type
) {
1772 _mesa_glsl_error(& loc
, state
,
1773 "could not implicitly convert "
1774 "%s to %s", type
->name
, orig_type
->name
);
1775 type
= glsl_type::error_type
;
1778 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1779 type
, op
[0], op
[1]);
1781 do_assignment(instructions
, state
,
1782 this->subexpressions
[0]->non_lvalue_description
,
1783 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1784 &result
, needs_rvalue
, false,
1785 this->subexpressions
[0]->get_location());
1789 case ast_conditional
: {
1790 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1792 * "The ternary selection operator (?:). It operates on three
1793 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1794 * first expression, which must result in a scalar Boolean."
1796 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1797 "condition", &error_emitted
);
1799 /* The :? operator is implemented by generating an anonymous temporary
1800 * followed by an if-statement. The last instruction in each branch of
1801 * the if-statement assigns a value to the anonymous temporary. This
1802 * temporary is the r-value of the expression.
1804 exec_list then_instructions
;
1805 exec_list else_instructions
;
1807 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1808 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1810 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1812 * "The second and third expressions can be any type, as
1813 * long their types match, or there is a conversion in
1814 * Section 4.1.10 "Implicit Conversions" that can be applied
1815 * to one of the expressions to make their types match. This
1816 * resulting matching type is the type of the entire
1819 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1820 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1821 || (op
[1]->type
!= op
[2]->type
)) {
1822 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1824 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1825 "operator must have matching types");
1826 error_emitted
= true;
1827 type
= glsl_type::error_type
;
1832 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1834 * "The second and third expressions must be the same type, but can
1835 * be of any type other than an array."
1837 if (type
->is_array() &&
1838 !state
->check_version(120, 300, &loc
,
1839 "second and third operands of ?: operator "
1840 "cannot be arrays")) {
1841 error_emitted
= true;
1844 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1846 * "Except for array indexing, structure member selection, and
1847 * parentheses, opaque variables are not allowed to be operands in
1848 * expressions; such use results in a compile-time error."
1850 if (type
->contains_opaque()) {
1851 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1852 "of the ?: operator");
1853 error_emitted
= true;
1856 ir_constant
*cond_val
= op
[0]->constant_expression_value(ctx
);
1858 if (then_instructions
.is_empty()
1859 && else_instructions
.is_empty()
1860 && cond_val
!= NULL
) {
1861 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1863 /* The copy to conditional_tmp reads the whole array. */
1864 if (type
->is_array()) {
1865 mark_whole_array_access(op
[1]);
1866 mark_whole_array_access(op
[2]);
1869 ir_variable
*const tmp
=
1870 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1871 instructions
->push_tail(tmp
);
1873 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1874 instructions
->push_tail(stmt
);
1876 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1877 ir_dereference
*const then_deref
=
1878 new(ctx
) ir_dereference_variable(tmp
);
1879 ir_assignment
*const then_assign
=
1880 new(ctx
) ir_assignment(then_deref
, op
[1]);
1881 stmt
->then_instructions
.push_tail(then_assign
);
1883 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1884 ir_dereference
*const else_deref
=
1885 new(ctx
) ir_dereference_variable(tmp
);
1886 ir_assignment
*const else_assign
=
1887 new(ctx
) ir_assignment(else_deref
, op
[2]);
1888 stmt
->else_instructions
.push_tail(else_assign
);
1890 result
= new(ctx
) ir_dereference_variable(tmp
);
1897 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1898 ? "pre-increment operation" : "pre-decrement operation";
1900 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1901 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1903 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1905 ir_rvalue
*temp_rhs
;
1906 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1910 do_assignment(instructions
, state
,
1911 this->subexpressions
[0]->non_lvalue_description
,
1912 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1913 &result
, needs_rvalue
, false,
1914 this->subexpressions
[0]->get_location());
1919 case ast_post_dec
: {
1920 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1921 ? "post-increment operation" : "post-decrement operation";
1922 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1923 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1925 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1927 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1929 ir_rvalue
*temp_rhs
;
1930 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1933 /* Get a temporary of a copy of the lvalue before it's modified.
1934 * This may get thrown away later.
1936 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1938 ir_rvalue
*junk_rvalue
;
1940 do_assignment(instructions
, state
,
1941 this->subexpressions
[0]->non_lvalue_description
,
1942 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1943 &junk_rvalue
, false, false,
1944 this->subexpressions
[0]->get_location());
1949 case ast_field_selection
:
1950 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1953 case ast_array_index
: {
1954 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1956 /* Getting if an array is being used uninitialized is beyond what we get
1957 * from ir_value.data.assigned. Setting is_lhs as true would force to
1958 * not raise a uninitialized warning when using an array
1960 subexpressions
[0]->set_is_lhs(true);
1961 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1962 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1964 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1967 if (result
->type
->is_error())
1968 error_emitted
= true;
1973 case ast_unsized_array_dim
:
1974 assert(!"ast_unsized_array_dim: Should never get here.");
1977 case ast_function_call
:
1978 /* Should *NEVER* get here. ast_function_call should always be handled
1979 * by ast_function_expression::hir.
1984 case ast_identifier
: {
1985 /* ast_identifier can appear several places in a full abstract syntax
1986 * tree. This particular use must be at location specified in the grammar
1987 * as 'variable_identifier'.
1990 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1993 /* the identifier might be a subroutine name */
1995 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
1996 var
= state
->symbols
->get_variable(sub_name
);
1997 ralloc_free(sub_name
);
2001 var
->data
.used
= true;
2002 result
= new(ctx
) ir_dereference_variable(var
);
2004 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
2006 && result
->variable_referenced()->data
.assigned
!= true
2007 && !is_gl_identifier(var
->name
)) {
2008 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
2009 this->primary_expression
.identifier
);
2012 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
2013 this->primary_expression
.identifier
);
2015 result
= ir_rvalue::error_value(ctx
);
2016 error_emitted
= true;
2021 case ast_int_constant
:
2022 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
2025 case ast_uint_constant
:
2026 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
2029 case ast_float_constant
:
2030 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
2033 case ast_bool_constant
:
2034 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2037 case ast_double_constant
:
2038 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2041 case ast_uint64_constant
:
2042 result
= new(ctx
) ir_constant(this->primary_expression
.uint64_constant
);
2045 case ast_int64_constant
:
2046 result
= new(ctx
) ir_constant(this->primary_expression
.int64_constant
);
2049 case ast_sequence
: {
2050 /* It should not be possible to generate a sequence in the AST without
2051 * any expressions in it.
2053 assert(!this->expressions
.is_empty());
2055 /* The r-value of a sequence is the last expression in the sequence. If
2056 * the other expressions in the sequence do not have side-effects (and
2057 * therefore add instructions to the instruction list), they get dropped
2060 exec_node
*previous_tail
= NULL
;
2061 YYLTYPE previous_operand_loc
= loc
;
2063 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2064 /* If one of the operands of comma operator does not generate any
2065 * code, we want to emit a warning. At each pass through the loop
2066 * previous_tail will point to the last instruction in the stream
2067 * *before* processing the previous operand. Naturally,
2068 * instructions->get_tail_raw() will point to the last instruction in
2069 * the stream *after* processing the previous operand. If the two
2070 * pointers match, then the previous operand had no effect.
2072 * The warning behavior here differs slightly from GCC. GCC will
2073 * only emit a warning if none of the left-hand operands have an
2074 * effect. However, it will emit a warning for each. I believe that
2075 * there are some cases in C (especially with GCC extensions) where
2076 * it is useful to have an intermediate step in a sequence have no
2077 * effect, but I don't think these cases exist in GLSL. Either way,
2078 * it would be a giant hassle to replicate that behavior.
2080 if (previous_tail
== instructions
->get_tail_raw()) {
2081 _mesa_glsl_warning(&previous_operand_loc
, state
,
2082 "left-hand operand of comma expression has "
2086 /* The tail is directly accessed instead of using the get_tail()
2087 * method for performance reasons. get_tail() has extra code to
2088 * return NULL when the list is empty. We don't care about that
2089 * here, so using get_tail_raw() is fine.
2091 previous_tail
= instructions
->get_tail_raw();
2092 previous_operand_loc
= ast
->get_location();
2094 result
= ast
->hir(instructions
, state
);
2097 /* Any errors should have already been emitted in the loop above.
2099 error_emitted
= true;
2103 type
= NULL
; /* use result->type, not type. */
2104 assert(result
!= NULL
|| !needs_rvalue
);
2106 if (result
&& result
->type
->is_error() && !error_emitted
)
2107 _mesa_glsl_error(& loc
, state
, "type mismatch");
2113 ast_expression::has_sequence_subexpression() const
2115 switch (this->oper
) {
2124 return this->subexpressions
[0]->has_sequence_subexpression();
2146 case ast_array_index
:
2147 case ast_mul_assign
:
2148 case ast_div_assign
:
2149 case ast_add_assign
:
2150 case ast_sub_assign
:
2151 case ast_mod_assign
:
2154 case ast_and_assign
:
2155 case ast_xor_assign
:
2157 return this->subexpressions
[0]->has_sequence_subexpression() ||
2158 this->subexpressions
[1]->has_sequence_subexpression();
2160 case ast_conditional
:
2161 return this->subexpressions
[0]->has_sequence_subexpression() ||
2162 this->subexpressions
[1]->has_sequence_subexpression() ||
2163 this->subexpressions
[2]->has_sequence_subexpression();
2168 case ast_field_selection
:
2169 case ast_identifier
:
2170 case ast_int_constant
:
2171 case ast_uint_constant
:
2172 case ast_float_constant
:
2173 case ast_bool_constant
:
2174 case ast_double_constant
:
2175 case ast_int64_constant
:
2176 case ast_uint64_constant
:
2182 case ast_function_call
:
2183 unreachable("should be handled by ast_function_expression::hir");
2185 case ast_unsized_array_dim
:
2186 unreachable("ast_unsized_array_dim: Should never get here.");
2193 ast_expression_statement::hir(exec_list
*instructions
,
2194 struct _mesa_glsl_parse_state
*state
)
2196 /* It is possible to have expression statements that don't have an
2197 * expression. This is the solitary semicolon:
2199 * for (i = 0; i < 5; i++)
2202 * In this case the expression will be NULL. Test for NULL and don't do
2203 * anything in that case.
2205 if (expression
!= NULL
)
2206 expression
->hir_no_rvalue(instructions
, state
);
2208 /* Statements do not have r-values.
2215 ast_compound_statement::hir(exec_list
*instructions
,
2216 struct _mesa_glsl_parse_state
*state
)
2219 state
->symbols
->push_scope();
2221 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2222 ast
->hir(instructions
, state
);
2225 state
->symbols
->pop_scope();
2227 /* Compound statements do not have r-values.
2233 * Evaluate the given exec_node (which should be an ast_node representing
2234 * a single array dimension) and return its integer value.
2237 process_array_size(exec_node
*node
,
2238 struct _mesa_glsl_parse_state
*state
)
2240 void *mem_ctx
= state
;
2242 exec_list dummy_instructions
;
2244 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2247 * Dimensions other than the outermost dimension can by unsized if they
2248 * are immediately sized by a constructor or initializer.
2250 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2253 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2254 YYLTYPE loc
= array_size
->get_location();
2257 _mesa_glsl_error(& loc
, state
,
2258 "array size could not be resolved");
2262 if (!ir
->type
->is_integer()) {
2263 _mesa_glsl_error(& loc
, state
,
2264 "array size must be integer type");
2268 if (!ir
->type
->is_scalar()) {
2269 _mesa_glsl_error(& loc
, state
,
2270 "array size must be scalar type");
2274 ir_constant
*const size
= ir
->constant_expression_value(mem_ctx
);
2276 (state
->is_version(120, 300) &&
2277 array_size
->has_sequence_subexpression())) {
2278 _mesa_glsl_error(& loc
, state
, "array size must be a "
2279 "constant valued expression");
2283 if (size
->value
.i
[0] <= 0) {
2284 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2288 assert(size
->type
== ir
->type
);
2290 /* If the array size is const (and we've verified that
2291 * it is) then no instructions should have been emitted
2292 * when we converted it to HIR. If they were emitted,
2293 * then either the array size isn't const after all, or
2294 * we are emitting unnecessary instructions.
2296 assert(dummy_instructions
.is_empty());
2298 return size
->value
.u
[0];
2301 static const glsl_type
*
2302 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2303 ast_array_specifier
*array_specifier
,
2304 struct _mesa_glsl_parse_state
*state
)
2306 const glsl_type
*array_type
= base
;
2308 if (array_specifier
!= NULL
) {
2309 if (base
->is_array()) {
2311 /* From page 19 (page 25) of the GLSL 1.20 spec:
2313 * "Only one-dimensional arrays may be declared."
2315 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2316 return glsl_type::error_type
;
2320 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2321 !node
->is_head_sentinel(); node
= node
->prev
) {
2322 unsigned array_size
= process_array_size(node
, state
);
2323 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2331 precision_qualifier_allowed(const glsl_type
*type
)
2333 /* Precision qualifiers apply to floating point, integer and opaque
2336 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2337 * "Any floating point or any integer declaration can have the type
2338 * preceded by one of these precision qualifiers [...] Literal
2339 * constants do not have precision qualifiers. Neither do Boolean
2342 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2345 * "Precision qualifiers are added for code portability with OpenGL
2346 * ES, not for functionality. They have the same syntax as in OpenGL
2349 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2351 * "uniform lowp sampler2D sampler;
2354 * lowp vec4 col = texture2D (sampler, coord);
2355 * // texture2D returns lowp"
2357 * From this, we infer that GLSL 1.30 (and later) should allow precision
2358 * qualifiers on sampler types just like float and integer types.
2360 const glsl_type
*const t
= type
->without_array();
2362 return (t
->is_float() || t
->is_integer() || t
->contains_opaque()) &&
2367 ast_type_specifier::glsl_type(const char **name
,
2368 struct _mesa_glsl_parse_state
*state
) const
2370 const struct glsl_type
*type
;
2372 if (this->type
!= NULL
)
2375 type
= structure
->type
;
2377 type
= state
->symbols
->get_type(this->type_name
);
2378 *name
= this->type_name
;
2380 YYLTYPE loc
= this->get_location();
2381 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2387 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2389 * "The precision statement
2391 * precision precision-qualifier type;
2393 * can be used to establish a default precision qualifier. The type field can
2394 * be either int or float or any of the sampler types, (...) If type is float,
2395 * the directive applies to non-precision-qualified floating point type
2396 * (scalar, vector, and matrix) declarations. If type is int, the directive
2397 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2398 * and unsigned) declarations."
2400 * We use the symbol table to keep the values of the default precisions for
2401 * each 'type' in each scope and we use the 'type' string from the precision
2402 * statement as key in the symbol table. When we want to retrieve the default
2403 * precision associated with a given glsl_type we need to know the type string
2404 * associated with it. This is what this function returns.
2407 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2409 switch (type
->base_type
) {
2410 case GLSL_TYPE_FLOAT
:
2412 case GLSL_TYPE_UINT
:
2415 case GLSL_TYPE_ATOMIC_UINT
:
2416 return "atomic_uint";
2417 case GLSL_TYPE_IMAGE
:
2419 case GLSL_TYPE_SAMPLER
: {
2420 const unsigned type_idx
=
2421 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2422 const unsigned offset
= type
->is_sampler() ? 0 : 4;
2423 assert(type_idx
< 4);
2424 switch (type
->sampled_type
) {
2425 case GLSL_TYPE_FLOAT
:
2426 switch (type
->sampler_dimensionality
) {
2427 case GLSL_SAMPLER_DIM_1D
: {
2428 assert(type
->is_sampler());
2429 static const char *const names
[4] = {
2430 "sampler1D", "sampler1DArray",
2431 "sampler1DShadow", "sampler1DArrayShadow"
2433 return names
[type_idx
];
2435 case GLSL_SAMPLER_DIM_2D
: {
2436 static const char *const names
[8] = {
2437 "sampler2D", "sampler2DArray",
2438 "sampler2DShadow", "sampler2DArrayShadow",
2439 "image2D", "image2DArray", NULL
, NULL
2441 return names
[offset
+ type_idx
];
2443 case GLSL_SAMPLER_DIM_3D
: {
2444 static const char *const names
[8] = {
2445 "sampler3D", NULL
, NULL
, NULL
,
2446 "image3D", NULL
, NULL
, NULL
2448 return names
[offset
+ type_idx
];
2450 case GLSL_SAMPLER_DIM_CUBE
: {
2451 static const char *const names
[8] = {
2452 "samplerCube", "samplerCubeArray",
2453 "samplerCubeShadow", "samplerCubeArrayShadow",
2454 "imageCube", NULL
, NULL
, NULL
2456 return names
[offset
+ type_idx
];
2458 case GLSL_SAMPLER_DIM_MS
: {
2459 assert(type
->is_sampler());
2460 static const char *const names
[4] = {
2461 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2463 return names
[type_idx
];
2465 case GLSL_SAMPLER_DIM_RECT
: {
2466 assert(type
->is_sampler());
2467 static const char *const names
[4] = {
2468 "samplerRect", NULL
, "samplerRectShadow", NULL
2470 return names
[type_idx
];
2472 case GLSL_SAMPLER_DIM_BUF
: {
2473 static const char *const names
[8] = {
2474 "samplerBuffer", NULL
, NULL
, NULL
,
2475 "imageBuffer", NULL
, NULL
, NULL
2477 return names
[offset
+ type_idx
];
2479 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2480 assert(type
->is_sampler());
2481 static const char *const names
[4] = {
2482 "samplerExternalOES", NULL
, NULL
, NULL
2484 return names
[type_idx
];
2487 unreachable("Unsupported sampler/image dimensionality");
2488 } /* sampler/image float dimensionality */
2491 switch (type
->sampler_dimensionality
) {
2492 case GLSL_SAMPLER_DIM_1D
: {
2493 assert(type
->is_sampler());
2494 static const char *const names
[4] = {
2495 "isampler1D", "isampler1DArray", NULL
, NULL
2497 return names
[type_idx
];
2499 case GLSL_SAMPLER_DIM_2D
: {
2500 static const char *const names
[8] = {
2501 "isampler2D", "isampler2DArray", NULL
, NULL
,
2502 "iimage2D", "iimage2DArray", NULL
, NULL
2504 return names
[offset
+ type_idx
];
2506 case GLSL_SAMPLER_DIM_3D
: {
2507 static const char *const names
[8] = {
2508 "isampler3D", NULL
, NULL
, NULL
,
2509 "iimage3D", NULL
, NULL
, NULL
2511 return names
[offset
+ type_idx
];
2513 case GLSL_SAMPLER_DIM_CUBE
: {
2514 static const char *const names
[8] = {
2515 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2516 "iimageCube", NULL
, NULL
, NULL
2518 return names
[offset
+ type_idx
];
2520 case GLSL_SAMPLER_DIM_MS
: {
2521 assert(type
->is_sampler());
2522 static const char *const names
[4] = {
2523 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2525 return names
[type_idx
];
2527 case GLSL_SAMPLER_DIM_RECT
: {
2528 assert(type
->is_sampler());
2529 static const char *const names
[4] = {
2530 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2532 return names
[type_idx
];
2534 case GLSL_SAMPLER_DIM_BUF
: {
2535 static const char *const names
[8] = {
2536 "isamplerBuffer", NULL
, NULL
, NULL
,
2537 "iimageBuffer", NULL
, NULL
, NULL
2539 return names
[offset
+ type_idx
];
2542 unreachable("Unsupported isampler/iimage dimensionality");
2543 } /* sampler/image int dimensionality */
2545 case GLSL_TYPE_UINT
:
2546 switch (type
->sampler_dimensionality
) {
2547 case GLSL_SAMPLER_DIM_1D
: {
2548 assert(type
->is_sampler());
2549 static const char *const names
[4] = {
2550 "usampler1D", "usampler1DArray", NULL
, NULL
2552 return names
[type_idx
];
2554 case GLSL_SAMPLER_DIM_2D
: {
2555 static const char *const names
[8] = {
2556 "usampler2D", "usampler2DArray", NULL
, NULL
,
2557 "uimage2D", "uimage2DArray", NULL
, NULL
2559 return names
[offset
+ type_idx
];
2561 case GLSL_SAMPLER_DIM_3D
: {
2562 static const char *const names
[8] = {
2563 "usampler3D", NULL
, NULL
, NULL
,
2564 "uimage3D", NULL
, NULL
, NULL
2566 return names
[offset
+ type_idx
];
2568 case GLSL_SAMPLER_DIM_CUBE
: {
2569 static const char *const names
[8] = {
2570 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2571 "uimageCube", NULL
, NULL
, NULL
2573 return names
[offset
+ type_idx
];
2575 case GLSL_SAMPLER_DIM_MS
: {
2576 assert(type
->is_sampler());
2577 static const char *const names
[4] = {
2578 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2580 return names
[type_idx
];
2582 case GLSL_SAMPLER_DIM_RECT
: {
2583 assert(type
->is_sampler());
2584 static const char *const names
[4] = {
2585 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2587 return names
[type_idx
];
2589 case GLSL_SAMPLER_DIM_BUF
: {
2590 static const char *const names
[8] = {
2591 "usamplerBuffer", NULL
, NULL
, NULL
,
2592 "uimageBuffer", NULL
, NULL
, NULL
2594 return names
[offset
+ type_idx
];
2597 unreachable("Unsupported usampler/uimage dimensionality");
2598 } /* sampler/image uint dimensionality */
2601 unreachable("Unsupported sampler/image type");
2602 } /* sampler/image type */
2604 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2607 unreachable("Unsupported type");
2612 select_gles_precision(unsigned qual_precision
,
2613 const glsl_type
*type
,
2614 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2616 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2617 * In GLES we take the precision from the type qualifier if present,
2618 * otherwise, if the type of the variable allows precision qualifiers at
2619 * all, we look for the default precision qualifier for that type in the
2622 assert(state
->es_shader
);
2624 unsigned precision
= GLSL_PRECISION_NONE
;
2625 if (qual_precision
) {
2626 precision
= qual_precision
;
2627 } else if (precision_qualifier_allowed(type
)) {
2628 const char *type_name
=
2629 get_type_name_for_precision_qualifier(type
->without_array());
2630 assert(type_name
!= NULL
);
2633 state
->symbols
->get_default_precision_qualifier(type_name
);
2634 if (precision
== ast_precision_none
) {
2635 _mesa_glsl_error(loc
, state
,
2636 "No precision specified in this scope for type `%s'",
2642 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2644 * "The default precision of all atomic types is highp. It is an error to
2645 * declare an atomic type with a different precision or to specify the
2646 * default precision for an atomic type to be lowp or mediump."
2648 if (type
->is_atomic_uint() && precision
!= ast_precision_high
) {
2649 _mesa_glsl_error(loc
, state
,
2650 "atomic_uint can only have highp precision qualifier");
2657 ast_fully_specified_type::glsl_type(const char **name
,
2658 struct _mesa_glsl_parse_state
*state
) const
2660 return this->specifier
->glsl_type(name
, state
);
2664 * Determine whether a toplevel variable declaration declares a varying. This
2665 * function operates by examining the variable's mode and the shader target,
2666 * so it correctly identifies linkage variables regardless of whether they are
2667 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2669 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2670 * this function will produce undefined results.
2673 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2676 case MESA_SHADER_VERTEX
:
2677 return var
->data
.mode
== ir_var_shader_out
;
2678 case MESA_SHADER_FRAGMENT
:
2679 return var
->data
.mode
== ir_var_shader_in
;
2681 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2686 is_allowed_invariant(ir_variable
*var
, struct _mesa_glsl_parse_state
*state
)
2688 if (is_varying_var(var
, state
->stage
))
2691 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
2692 * "Only variables output from a vertex shader can be candidates
2695 if (!state
->is_version(130, 0))
2699 * Later specs remove this language - so allowed invariant
2700 * on fragment shader outputs as well.
2702 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
2703 var
->data
.mode
== ir_var_shader_out
)
2709 * Matrix layout qualifiers are only allowed on certain types
2712 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2714 const glsl_type
*type
,
2717 if (var
&& !var
->is_in_buffer_block()) {
2718 /* Layout qualifiers may only apply to interface blocks and fields in
2721 _mesa_glsl_error(loc
, state
,
2722 "uniform block layout qualifiers row_major and "
2723 "column_major may not be applied to variables "
2724 "outside of uniform blocks");
2725 } else if (!type
->without_array()->is_matrix()) {
2726 /* The OpenGL ES 3.0 conformance tests did not originally allow
2727 * matrix layout qualifiers on non-matrices. However, the OpenGL
2728 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2729 * amended to specifically allow these layouts on all types. Emit
2730 * a warning so that people know their code may not be portable.
2732 _mesa_glsl_warning(loc
, state
,
2733 "uniform block layout qualifiers row_major and "
2734 "column_major applied to non-matrix types may "
2735 "be rejected by older compilers");
2740 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2741 struct _mesa_glsl_parse_state
*state
,
2742 unsigned xfb_buffer
) {
2743 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2744 _mesa_glsl_error(loc
, state
,
2745 "invalid xfb_buffer specified %d is larger than "
2746 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2748 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2755 /* From the ARB_enhanced_layouts spec:
2757 * "Variables and block members qualified with *xfb_offset* can be
2758 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2759 * The offset must be a multiple of the size of the first component of
2760 * the first qualified variable or block member, or a compile-time error
2761 * results. Further, if applied to an aggregate containing a double,
2762 * the offset must also be a multiple of 8, and the space taken in the
2763 * buffer will be a multiple of 8.
2766 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2767 struct _mesa_glsl_parse_state
*state
,
2768 int xfb_offset
, const glsl_type
*type
,
2769 unsigned component_size
) {
2770 const glsl_type
*t_without_array
= type
->without_array();
2772 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2773 _mesa_glsl_error(loc
, state
,
2774 "xfb_offset can't be used with unsized arrays.");
2778 /* Make sure nested structs don't contain unsized arrays, and validate
2779 * any xfb_offsets on interface members.
2781 if (t_without_array
->is_record() || t_without_array
->is_interface())
2782 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2783 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2785 /* When the interface block doesn't have an xfb_offset qualifier then
2786 * we apply the component size rules at the member level.
2788 if (xfb_offset
== -1)
2789 component_size
= member_t
->contains_double() ? 8 : 4;
2791 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2792 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2796 /* Nested structs or interface block without offset may not have had an
2797 * offset applied yet so return.
2799 if (xfb_offset
== -1) {
2803 if (xfb_offset
% component_size
) {
2804 _mesa_glsl_error(loc
, state
,
2805 "invalid qualifier xfb_offset=%d must be a multiple "
2806 "of the first component size of the first qualified "
2807 "variable or block member. Or double if an aggregate "
2808 "that contains a double (%d).",
2809 xfb_offset
, component_size
);
2817 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2820 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2821 _mesa_glsl_error(loc
, state
,
2822 "invalid stream specified %d is larger than "
2823 "MAX_VERTEX_STREAMS - 1 (%d).",
2824 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2832 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2835 const glsl_type
*type
,
2836 const ast_type_qualifier
*qual
)
2838 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2839 _mesa_glsl_error(loc
, state
,
2840 "the \"binding\" qualifier only applies to uniforms and "
2841 "shader storage buffer objects");
2845 unsigned qual_binding
;
2846 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2851 const struct gl_context
*const ctx
= state
->ctx
;
2852 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2853 unsigned max_index
= qual_binding
+ elements
- 1;
2854 const glsl_type
*base_type
= type
->without_array();
2856 if (base_type
->is_interface()) {
2857 /* UBOs. From page 60 of the GLSL 4.20 specification:
2858 * "If the binding point for any uniform block instance is less than zero,
2859 * or greater than or equal to the implementation-dependent maximum
2860 * number of uniform buffer bindings, a compilation error will occur.
2861 * When the binding identifier is used with a uniform block instanced as
2862 * an array of size N, all elements of the array from binding through
2863 * binding + N – 1 must be within this range."
2865 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2867 if (qual
->flags
.q
.uniform
&&
2868 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2869 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2870 "the maximum number of UBO binding points (%d)",
2871 qual_binding
, elements
,
2872 ctx
->Const
.MaxUniformBufferBindings
);
2876 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2877 * "If the binding point for any uniform or shader storage block instance
2878 * is less than zero, or greater than or equal to the
2879 * implementation-dependent maximum number of uniform buffer bindings, a
2880 * compile-time error will occur. When the binding identifier is used
2881 * with a uniform or shader storage block instanced as an array of size
2882 * N, all elements of the array from binding through binding + N – 1 must
2883 * be within this range."
2885 if (qual
->flags
.q
.buffer
&&
2886 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2887 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2888 "the maximum number of SSBO binding points (%d)",
2889 qual_binding
, elements
,
2890 ctx
->Const
.MaxShaderStorageBufferBindings
);
2893 } else if (base_type
->is_sampler()) {
2894 /* Samplers. From page 63 of the GLSL 4.20 specification:
2895 * "If the binding is less than zero, or greater than or equal to the
2896 * implementation-dependent maximum supported number of units, a
2897 * compilation error will occur. When the binding identifier is used
2898 * with an array of size N, all elements of the array from binding
2899 * through binding + N - 1 must be within this range."
2901 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2903 if (max_index
>= limit
) {
2904 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2905 "exceeds the maximum number of texture image units "
2906 "(%u)", qual_binding
, elements
, limit
);
2910 } else if (base_type
->contains_atomic()) {
2911 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2912 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2913 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2914 "maximum number of atomic counter buffer bindings "
2915 "(%u)", qual_binding
,
2916 ctx
->Const
.MaxAtomicBufferBindings
);
2920 } else if ((state
->is_version(420, 310) ||
2921 state
->ARB_shading_language_420pack_enable
) &&
2922 base_type
->is_image()) {
2923 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2924 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2925 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2926 "maximum number of image units (%d)", max_index
,
2927 ctx
->Const
.MaxImageUnits
);
2932 _mesa_glsl_error(loc
, state
,
2933 "the \"binding\" qualifier only applies to uniform "
2934 "blocks, storage blocks, opaque variables, or arrays "
2939 var
->data
.explicit_binding
= true;
2940 var
->data
.binding
= qual_binding
;
2946 validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state
*state
,
2948 const glsl_interp_mode interpolation
,
2949 const struct glsl_type
*var_type
,
2950 ir_variable_mode mode
)
2952 if (state
->stage
!= MESA_SHADER_FRAGMENT
||
2953 interpolation
== INTERP_MODE_FLAT
||
2954 mode
!= ir_var_shader_in
)
2957 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2958 * so must integer vertex outputs.
2960 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2961 * "Fragment shader inputs that are signed or unsigned integers or
2962 * integer vectors must be qualified with the interpolation qualifier
2965 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2966 * "Fragment shader inputs that are, or contain, signed or unsigned
2967 * integers or integer vectors must be qualified with the
2968 * interpolation qualifier flat."
2970 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2971 * "Vertex shader outputs that are, or contain, signed or unsigned
2972 * integers or integer vectors must be qualified with the
2973 * interpolation qualifier flat."
2975 * Note that prior to GLSL 1.50, this requirement applied to vertex
2976 * outputs rather than fragment inputs. That creates problems in the
2977 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2978 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2979 * apply the restriction to both vertex outputs and fragment inputs.
2981 * Note also that the desktop GLSL specs are missing the text "or
2982 * contain"; this is presumably an oversight, since there is no
2983 * reasonable way to interpolate a fragment shader input that contains
2984 * an integer. See Khronos bug #15671.
2986 if (state
->is_version(130, 300)
2987 && var_type
->contains_integer()) {
2988 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
2989 "an integer, then it must be qualified with 'flat'");
2992 /* Double fragment inputs must be qualified with 'flat'.
2994 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
2995 * "This extension does not support interpolation of double-precision
2996 * values; doubles used as fragment shader inputs must be qualified as
2999 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
3000 * "Fragment shader inputs that are signed or unsigned integers, integer
3001 * vectors, or any double-precision floating-point type must be
3002 * qualified with the interpolation qualifier flat."
3004 * Note that the GLSL specs are missing the text "or contain"; this is
3005 * presumably an oversight. See Khronos bug #15671.
3007 * The 'double' type does not exist in GLSL ES so far.
3009 if (state
->has_double()
3010 && var_type
->contains_double()) {
3011 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3012 "a double, then it must be qualified with 'flat'");
3015 /* Bindless sampler/image fragment inputs must be qualified with 'flat'.
3017 * From section 4.3.4 of the ARB_bindless_texture spec:
3019 * "(modify last paragraph, p. 35, allowing samplers and images as
3020 * fragment shader inputs) ... Fragment inputs can only be signed and
3021 * unsigned integers and integer vectors, floating point scalars,
3022 * floating-point vectors, matrices, sampler and image types, or arrays
3023 * or structures of these. Fragment shader inputs that are signed or
3024 * unsigned integers, integer vectors, or any double-precision floating-
3025 * point type, or any sampler or image type must be qualified with the
3026 * interpolation qualifier "flat"."
3028 if (state
->has_bindless()
3029 && (var_type
->contains_sampler() || var_type
->contains_image())) {
3030 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3031 "a bindless sampler (or image), then it must be "
3032 "qualified with 'flat'");
3037 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
3039 const glsl_interp_mode interpolation
,
3040 const struct ast_type_qualifier
*qual
,
3041 const struct glsl_type
*var_type
,
3042 ir_variable_mode mode
)
3044 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
3045 * not to vertex shader inputs nor fragment shader outputs.
3047 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3048 * "Outputs from a vertex shader (out) and inputs to a fragment
3049 * shader (in) can be further qualified with one or more of these
3050 * interpolation qualifiers"
3052 * "These interpolation qualifiers may only precede the qualifiers in,
3053 * centroid in, out, or centroid out in a declaration. They do not apply
3054 * to the deprecated storage qualifiers varying or centroid
3055 * varying. They also do not apply to inputs into a vertex shader or
3056 * outputs from a fragment shader."
3058 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
3059 * "Outputs from a shader (out) and inputs to a shader (in) can be
3060 * further qualified with one of these interpolation qualifiers."
3062 * "These interpolation qualifiers may only precede the qualifiers
3063 * in, centroid in, out, or centroid out in a declaration. They do
3064 * not apply to inputs into a vertex shader or outputs from a
3067 if (state
->is_version(130, 300)
3068 && interpolation
!= INTERP_MODE_NONE
) {
3069 const char *i
= interpolation_string(interpolation
);
3070 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
3071 _mesa_glsl_error(loc
, state
,
3072 "interpolation qualifier `%s' can only be applied to "
3073 "shader inputs or outputs.", i
);
3075 switch (state
->stage
) {
3076 case MESA_SHADER_VERTEX
:
3077 if (mode
== ir_var_shader_in
) {
3078 _mesa_glsl_error(loc
, state
,
3079 "interpolation qualifier '%s' cannot be applied to "
3080 "vertex shader inputs", i
);
3083 case MESA_SHADER_FRAGMENT
:
3084 if (mode
== ir_var_shader_out
) {
3085 _mesa_glsl_error(loc
, state
,
3086 "interpolation qualifier '%s' cannot be applied to "
3087 "fragment shader outputs", i
);
3095 /* Interpolation qualifiers cannot be applied to 'centroid' and
3096 * 'centroid varying'.
3098 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3099 * "interpolation qualifiers may only precede the qualifiers in,
3100 * centroid in, out, or centroid out in a declaration. They do not apply
3101 * to the deprecated storage qualifiers varying or centroid varying."
3103 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3105 if (state
->is_version(130, 0)
3106 && interpolation
!= INTERP_MODE_NONE
3107 && qual
->flags
.q
.varying
) {
3109 const char *i
= interpolation_string(interpolation
);
3111 if (qual
->flags
.q
.centroid
)
3112 s
= "centroid varying";
3116 _mesa_glsl_error(loc
, state
,
3117 "qualifier '%s' cannot be applied to the "
3118 "deprecated storage qualifier '%s'", i
, s
);
3121 validate_fragment_flat_interpolation_input(state
, loc
, interpolation
,
3125 static glsl_interp_mode
3126 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3127 const struct glsl_type
*var_type
,
3128 ir_variable_mode mode
,
3129 struct _mesa_glsl_parse_state
*state
,
3132 glsl_interp_mode interpolation
;
3133 if (qual
->flags
.q
.flat
)
3134 interpolation
= INTERP_MODE_FLAT
;
3135 else if (qual
->flags
.q
.noperspective
)
3136 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3137 else if (qual
->flags
.q
.smooth
)
3138 interpolation
= INTERP_MODE_SMOOTH
;
3140 interpolation
= INTERP_MODE_NONE
;
3142 validate_interpolation_qualifier(state
, loc
,
3144 qual
, var_type
, mode
);
3146 return interpolation
;
3151 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3153 struct _mesa_glsl_parse_state
*state
,
3158 unsigned qual_location
;
3159 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3164 /* Checks for GL_ARB_explicit_uniform_location. */
3165 if (qual
->flags
.q
.uniform
) {
3166 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3169 const struct gl_context
*const ctx
= state
->ctx
;
3170 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3172 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3173 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3174 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3175 ctx
->Const
.MaxUserAssignableUniformLocations
);
3179 var
->data
.explicit_location
= true;
3180 var
->data
.location
= qual_location
;
3184 /* Between GL_ARB_explicit_attrib_location an
3185 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3186 * stage can be assigned explicit locations. The checking here associates
3187 * the correct extension with the correct stage's input / output:
3191 * vertex explicit_loc sso
3192 * tess control sso sso
3195 * fragment sso explicit_loc
3197 switch (state
->stage
) {
3198 case MESA_SHADER_VERTEX
:
3199 if (var
->data
.mode
== ir_var_shader_in
) {
3200 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3206 if (var
->data
.mode
== ir_var_shader_out
) {
3207 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3216 case MESA_SHADER_TESS_CTRL
:
3217 case MESA_SHADER_TESS_EVAL
:
3218 case MESA_SHADER_GEOMETRY
:
3219 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3220 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3229 case MESA_SHADER_FRAGMENT
:
3230 if (var
->data
.mode
== ir_var_shader_in
) {
3231 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3237 if (var
->data
.mode
== ir_var_shader_out
) {
3238 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3247 case MESA_SHADER_COMPUTE
:
3248 _mesa_glsl_error(loc
, state
,
3249 "compute shader variables cannot be given "
3250 "explicit locations");
3258 _mesa_glsl_error(loc
, state
,
3259 "%s cannot be given an explicit location in %s shader",
3261 _mesa_shader_stage_to_string(state
->stage
));
3263 var
->data
.explicit_location
= true;
3265 switch (state
->stage
) {
3266 case MESA_SHADER_VERTEX
:
3267 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3268 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3269 : (qual_location
+ VARYING_SLOT_VAR0
);
3272 case MESA_SHADER_TESS_CTRL
:
3273 case MESA_SHADER_TESS_EVAL
:
3274 case MESA_SHADER_GEOMETRY
:
3275 if (var
->data
.patch
)
3276 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3278 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3281 case MESA_SHADER_FRAGMENT
:
3282 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3283 ? (qual_location
+ FRAG_RESULT_DATA0
)
3284 : (qual_location
+ VARYING_SLOT_VAR0
);
3287 assert(!"Unexpected shader type");
3291 /* Check if index was set for the uniform instead of the function */
3292 if (qual
->flags
.q
.explicit_index
&& qual
->is_subroutine_decl()) {
3293 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3294 "used with subroutine functions");
3298 unsigned qual_index
;
3299 if (qual
->flags
.q
.explicit_index
&&
3300 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3302 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3303 * Layout Qualifiers):
3305 * "It is also a compile-time error if a fragment shader
3306 * sets a layout index to less than 0 or greater than 1."
3308 * Older specifications don't mandate a behavior; we take
3309 * this as a clarification and always generate the error.
3311 if (qual_index
> 1) {
3312 _mesa_glsl_error(loc
, state
,
3313 "explicit index may only be 0 or 1");
3315 var
->data
.explicit_index
= true;
3316 var
->data
.index
= qual_index
;
3323 validate_storage_for_sampler_image_types(ir_variable
*var
,
3324 struct _mesa_glsl_parse_state
*state
,
3327 /* From section 4.1.7 of the GLSL 4.40 spec:
3329 * "[Opaque types] can only be declared as function
3330 * parameters or uniform-qualified variables."
3332 * From section 4.1.7 of the ARB_bindless_texture spec:
3334 * "Samplers may be declared as shader inputs and outputs, as uniform
3335 * variables, as temporary variables, and as function parameters."
3337 * From section 4.1.X of the ARB_bindless_texture spec:
3339 * "Images may be declared as shader inputs and outputs, as uniform
3340 * variables, as temporary variables, and as function parameters."
3342 if (state
->has_bindless()) {
3343 if (var
->data
.mode
!= ir_var_auto
&&
3344 var
->data
.mode
!= ir_var_uniform
&&
3345 var
->data
.mode
!= ir_var_shader_in
&&
3346 var
->data
.mode
!= ir_var_shader_out
&&
3347 var
->data
.mode
!= ir_var_function_in
&&
3348 var
->data
.mode
!= ir_var_function_out
&&
3349 var
->data
.mode
!= ir_var_function_inout
) {
3350 _mesa_glsl_error(loc
, state
, "bindless image/sampler variables may "
3351 "only be declared as shader inputs and outputs, as "
3352 "uniform variables, as temporary variables and as "
3353 "function parameters");
3357 if (var
->data
.mode
!= ir_var_uniform
&&
3358 var
->data
.mode
!= ir_var_function_in
) {
3359 _mesa_glsl_error(loc
, state
, "image/sampler variables may only be "
3360 "declared as function parameters or "
3361 "uniform-qualified global variables");
3369 validate_memory_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3371 const struct ast_type_qualifier
*qual
,
3372 const glsl_type
*type
)
3374 /* From Section 4.10 (Memory Qualifiers) of the GLSL 4.50 spec:
3376 * "Memory qualifiers are only supported in the declarations of image
3377 * variables, buffer variables, and shader storage blocks; it is an error
3378 * to use such qualifiers in any other declarations.
3380 if (!type
->is_image() && !qual
->flags
.q
.buffer
) {
3381 if (qual
->flags
.q
.read_only
||
3382 qual
->flags
.q
.write_only
||
3383 qual
->flags
.q
.coherent
||
3384 qual
->flags
.q
._volatile
||
3385 qual
->flags
.q
.restrict_flag
) {
3386 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied "
3387 "in the declarations of image variables, buffer "
3388 "variables, and shader storage blocks");
3396 validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3398 const struct ast_type_qualifier
*qual
,
3399 const glsl_type
*type
)
3401 /* From section 4.4.6.2 (Format Layout Qualifiers) of the GLSL 4.50 spec:
3403 * "Format layout qualifiers can be used on image variable declarations
3404 * (those declared with a basic type having “image ” in its keyword)."
3406 if (!type
->is_image() && qual
->flags
.q
.explicit_image_format
) {
3407 _mesa_glsl_error(loc
, state
, "format layout qualifiers may only be "
3408 "applied to images");
3415 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3417 struct _mesa_glsl_parse_state
*state
,
3420 const glsl_type
*base_type
= var
->type
->without_array();
3422 if (!validate_image_format_qualifier_for_type(state
, loc
, qual
, base_type
) ||
3423 !validate_memory_qualifier_for_type(state
, loc
, qual
, base_type
))
3426 if (!base_type
->is_image())
3429 if (!validate_storage_for_sampler_image_types(var
, state
, loc
))
3432 var
->data
.memory_read_only
|= qual
->flags
.q
.read_only
;
3433 var
->data
.memory_write_only
|= qual
->flags
.q
.write_only
;
3434 var
->data
.memory_coherent
|= qual
->flags
.q
.coherent
;
3435 var
->data
.memory_volatile
|= qual
->flags
.q
._volatile
;
3436 var
->data
.memory_restrict
|= qual
->flags
.q
.restrict_flag
;
3438 if (qual
->flags
.q
.explicit_image_format
) {
3439 if (var
->data
.mode
== ir_var_function_in
) {
3440 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be used on "
3441 "image function parameters");
3444 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3445 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the base "
3446 "data type of the image");
3449 var
->data
.image_format
= qual
->image_format
;
3451 if (var
->data
.mode
== ir_var_uniform
) {
3452 if (state
->es_shader
) {
3453 _mesa_glsl_error(loc
, state
, "all image uniforms must have a "
3454 "format layout qualifier");
3455 } else if (!qual
->flags
.q
.write_only
) {
3456 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3457 "`writeonly' must have a format layout qualifier");
3460 var
->data
.image_format
= GL_NONE
;
3463 /* From page 70 of the GLSL ES 3.1 specification:
3465 * "Except for image variables qualified with the format qualifiers r32f,
3466 * r32i, and r32ui, image variables must specify either memory qualifier
3467 * readonly or the memory qualifier writeonly."
3469 if (state
->es_shader
&&
3470 var
->data
.image_format
!= GL_R32F
&&
3471 var
->data
.image_format
!= GL_R32I
&&
3472 var
->data
.image_format
!= GL_R32UI
&&
3473 !var
->data
.memory_read_only
&&
3474 !var
->data
.memory_write_only
) {
3475 _mesa_glsl_error(loc
, state
, "image variables of format other than r32f, "
3476 "r32i or r32ui must be qualified `readonly' or "
3481 static inline const char*
3482 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3484 if (origin_upper_left
&& pixel_center_integer
)
3485 return "origin_upper_left, pixel_center_integer";
3486 else if (origin_upper_left
)
3487 return "origin_upper_left";
3488 else if (pixel_center_integer
)
3489 return "pixel_center_integer";
3495 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3496 const struct ast_type_qualifier
*qual
)
3498 /* If gl_FragCoord was previously declared, and the qualifiers were
3499 * different in any way, return true.
3501 if (state
->fs_redeclares_gl_fragcoord
) {
3502 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3503 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3510 validate_array_dimensions(const glsl_type
*t
,
3511 struct _mesa_glsl_parse_state
*state
,
3513 if (t
->is_array()) {
3514 t
= t
->fields
.array
;
3515 while (t
->is_array()) {
3516 if (t
->is_unsized_array()) {
3517 _mesa_glsl_error(loc
, state
,
3518 "only the outermost array dimension can "
3523 t
= t
->fields
.array
;
3529 apply_bindless_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3531 struct _mesa_glsl_parse_state
*state
,
3534 bool has_local_qualifiers
= qual
->flags
.q
.bindless_sampler
||
3535 qual
->flags
.q
.bindless_image
||
3536 qual
->flags
.q
.bound_sampler
||
3537 qual
->flags
.q
.bound_image
;
3539 /* The ARB_bindless_texture spec says:
3541 * "Modify Section 4.4.6 Opaque-Uniform Layout Qualifiers of the GLSL 4.30
3544 * "If these layout qualifiers are applied to other types of default block
3545 * uniforms, or variables with non-uniform storage, a compile-time error
3546 * will be generated."
3548 if (has_local_qualifiers
&& !qual
->flags
.q
.uniform
) {
3549 _mesa_glsl_error(loc
, state
, "ARB_bindless_texture layout qualifiers "
3550 "can only be applied to default block uniforms or "
3551 "variables with uniform storage");
3555 /* The ARB_bindless_texture spec doesn't state anything in this situation,
3556 * but it makes sense to only allow bindless_sampler/bound_sampler for
3557 * sampler types, and respectively bindless_image/bound_image for image
3560 if ((qual
->flags
.q
.bindless_sampler
|| qual
->flags
.q
.bound_sampler
) &&
3561 !var
->type
->contains_sampler()) {
3562 _mesa_glsl_error(loc
, state
, "bindless_sampler or bound_sampler can only "
3563 "be applied to sampler types");
3567 if ((qual
->flags
.q
.bindless_image
|| qual
->flags
.q
.bound_image
) &&
3568 !var
->type
->contains_image()) {
3569 _mesa_glsl_error(loc
, state
, "bindless_image or bound_image can only be "
3570 "applied to image types");
3574 /* The bindless_sampler/bindless_image (and respectively
3575 * bound_sampler/bound_image) layout qualifiers can be set at global and at
3578 if (var
->type
->contains_sampler() || var
->type
->contains_image()) {
3579 var
->data
.bindless
= qual
->flags
.q
.bindless_sampler
||
3580 qual
->flags
.q
.bindless_image
||
3581 state
->bindless_sampler_specified
||
3582 state
->bindless_image_specified
;
3584 var
->data
.bound
= qual
->flags
.q
.bound_sampler
||
3585 qual
->flags
.q
.bound_image
||
3586 state
->bound_sampler_specified
||
3587 state
->bound_image_specified
;
3592 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3594 struct _mesa_glsl_parse_state
*state
,
3597 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3599 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3601 * "Within any shader, the first redeclarations of gl_FragCoord
3602 * must appear before any use of gl_FragCoord."
3604 * Generate a compiler error if above condition is not met by the
3607 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3608 if (earlier
!= NULL
&&
3609 earlier
->data
.used
&&
3610 !state
->fs_redeclares_gl_fragcoord
) {
3611 _mesa_glsl_error(loc
, state
,
3612 "gl_FragCoord used before its first redeclaration "
3613 "in fragment shader");
3616 /* Make sure all gl_FragCoord redeclarations specify the same layout
3619 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3620 const char *const qual_string
=
3621 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3622 qual
->flags
.q
.pixel_center_integer
);
3624 const char *const state_string
=
3625 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3626 state
->fs_pixel_center_integer
);
3628 _mesa_glsl_error(loc
, state
,
3629 "gl_FragCoord redeclared with different layout "
3630 "qualifiers (%s) and (%s) ",
3634 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3635 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3636 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3637 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3638 state
->fs_redeclares_gl_fragcoord
=
3639 state
->fs_origin_upper_left
||
3640 state
->fs_pixel_center_integer
||
3641 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3644 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3645 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3646 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3647 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3648 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3649 ? "origin_upper_left" : "pixel_center_integer";
3651 _mesa_glsl_error(loc
, state
,
3652 "layout qualifier `%s' can only be applied to "
3653 "fragment shader input `gl_FragCoord'",
3657 if (qual
->flags
.q
.explicit_location
) {
3658 apply_explicit_location(qual
, var
, state
, loc
);
3660 if (qual
->flags
.q
.explicit_component
) {
3661 unsigned qual_component
;
3662 if (process_qualifier_constant(state
, loc
, "component",
3663 qual
->component
, &qual_component
)) {
3664 const glsl_type
*type
= var
->type
->without_array();
3665 unsigned components
= type
->component_slots();
3667 if (type
->is_matrix() || type
->is_record()) {
3668 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3669 "cannot be applied to a matrix, a structure, "
3670 "a block, or an array containing any of "
3672 } else if (qual_component
!= 0 &&
3673 (qual_component
+ components
- 1) > 3) {
3674 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3675 (qual_component
+ components
- 1));
3676 } else if (qual_component
== 1 && type
->is_64bit()) {
3677 /* We don't bother checking for 3 as it should be caught by the
3678 * overflow check above.
3680 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3681 "component 1 or 3");
3683 var
->data
.explicit_component
= true;
3684 var
->data
.location_frac
= qual_component
;
3688 } else if (qual
->flags
.q
.explicit_index
) {
3689 if (!qual
->subroutine_list
)
3690 _mesa_glsl_error(loc
, state
,
3691 "explicit index requires explicit location");
3692 } else if (qual
->flags
.q
.explicit_component
) {
3693 _mesa_glsl_error(loc
, state
,
3694 "explicit component requires explicit location");
3697 if (qual
->flags
.q
.explicit_binding
) {
3698 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3701 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3702 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3703 unsigned qual_stream
;
3704 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3706 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3707 var
->data
.stream
= qual_stream
;
3711 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3712 unsigned qual_xfb_buffer
;
3713 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3714 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3715 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3716 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3717 if (qual
->flags
.q
.explicit_xfb_buffer
)
3718 var
->data
.explicit_xfb_buffer
= true;
3722 if (qual
->flags
.q
.explicit_xfb_offset
) {
3723 unsigned qual_xfb_offset
;
3724 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3726 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3727 qual
->offset
, &qual_xfb_offset
) &&
3728 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3729 var
->type
, component_size
)) {
3730 var
->data
.offset
= qual_xfb_offset
;
3731 var
->data
.explicit_xfb_offset
= true;
3735 if (qual
->flags
.q
.explicit_xfb_stride
) {
3736 unsigned qual_xfb_stride
;
3737 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3738 qual
->xfb_stride
, &qual_xfb_stride
)) {
3739 var
->data
.xfb_stride
= qual_xfb_stride
;
3740 var
->data
.explicit_xfb_stride
= true;
3744 if (var
->type
->contains_atomic()) {
3745 if (var
->data
.mode
== ir_var_uniform
) {
3746 if (var
->data
.explicit_binding
) {
3748 &state
->atomic_counter_offsets
[var
->data
.binding
];
3750 if (*offset
% ATOMIC_COUNTER_SIZE
)
3751 _mesa_glsl_error(loc
, state
,
3752 "misaligned atomic counter offset");
3754 var
->data
.offset
= *offset
;
3755 *offset
+= var
->type
->atomic_size();
3758 _mesa_glsl_error(loc
, state
,
3759 "atomic counters require explicit binding point");
3761 } else if (var
->data
.mode
!= ir_var_function_in
) {
3762 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3763 "function parameters or uniform-qualified "
3764 "global variables");
3768 if (var
->type
->contains_sampler() &&
3769 !validate_storage_for_sampler_image_types(var
, state
, loc
))
3772 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3773 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3774 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3775 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3776 * These extensions and all following extensions that add the 'layout'
3777 * keyword have been modified to require the use of 'in' or 'out'.
3779 * The following extension do not allow the deprecated keywords:
3781 * GL_AMD_conservative_depth
3782 * GL_ARB_conservative_depth
3783 * GL_ARB_gpu_shader5
3784 * GL_ARB_separate_shader_objects
3785 * GL_ARB_tessellation_shader
3786 * GL_ARB_transform_feedback3
3787 * GL_ARB_uniform_buffer_object
3789 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3790 * allow layout with the deprecated keywords.
3792 const bool relaxed_layout_qualifier_checking
=
3793 state
->ARB_fragment_coord_conventions_enable
;
3795 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3796 || qual
->flags
.q
.varying
;
3797 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3798 if (relaxed_layout_qualifier_checking
) {
3799 _mesa_glsl_warning(loc
, state
,
3800 "`layout' qualifier may not be used with "
3801 "`attribute' or `varying'");
3803 _mesa_glsl_error(loc
, state
,
3804 "`layout' qualifier may not be used with "
3805 "`attribute' or `varying'");
3809 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3810 * AMD_conservative_depth.
3812 if (qual
->flags
.q
.depth_type
3813 && !state
->is_version(420, 0)
3814 && !state
->AMD_conservative_depth_enable
3815 && !state
->ARB_conservative_depth_enable
) {
3816 _mesa_glsl_error(loc
, state
,
3817 "extension GL_AMD_conservative_depth or "
3818 "GL_ARB_conservative_depth must be enabled "
3819 "to use depth layout qualifiers");
3820 } else if (qual
->flags
.q
.depth_type
3821 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3822 _mesa_glsl_error(loc
, state
,
3823 "depth layout qualifiers can be applied only to "
3827 switch (qual
->depth_type
) {
3829 var
->data
.depth_layout
= ir_depth_layout_any
;
3831 case ast_depth_greater
:
3832 var
->data
.depth_layout
= ir_depth_layout_greater
;
3834 case ast_depth_less
:
3835 var
->data
.depth_layout
= ir_depth_layout_less
;
3837 case ast_depth_unchanged
:
3838 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3841 var
->data
.depth_layout
= ir_depth_layout_none
;
3845 if (qual
->flags
.q
.std140
||
3846 qual
->flags
.q
.std430
||
3847 qual
->flags
.q
.packed
||
3848 qual
->flags
.q
.shared
) {
3849 _mesa_glsl_error(loc
, state
,
3850 "uniform and shader storage block layout qualifiers "
3851 "std140, std430, packed, and shared can only be "
3852 "applied to uniform or shader storage blocks, not "
3856 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3857 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3860 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3863 * "Fragment shaders also allow the following layout qualifier on in only
3864 * (not with variable declarations)
3865 * layout-qualifier-id
3866 * early_fragment_tests
3869 if (qual
->flags
.q
.early_fragment_tests
) {
3870 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3871 "valid in fragment shader input layout declaration.");
3874 if (qual
->flags
.q
.inner_coverage
) {
3875 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3876 "valid in fragment shader input layout declaration.");
3879 if (qual
->flags
.q
.post_depth_coverage
) {
3880 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3881 "valid in fragment shader input layout declaration.");
3884 if (state
->has_bindless())
3885 apply_bindless_qualifier_to_variable(qual
, var
, state
, loc
);
3889 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3891 struct _mesa_glsl_parse_state
*state
,
3895 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3897 if (qual
->flags
.q
.invariant
) {
3898 if (var
->data
.used
) {
3899 _mesa_glsl_error(loc
, state
,
3900 "variable `%s' may not be redeclared "
3901 "`invariant' after being used",
3904 var
->data
.invariant
= 1;
3908 if (qual
->flags
.q
.precise
) {
3909 if (var
->data
.used
) {
3910 _mesa_glsl_error(loc
, state
,
3911 "variable `%s' may not be redeclared "
3912 "`precise' after being used",
3915 var
->data
.precise
= 1;
3919 if (qual
->is_subroutine_decl() && !qual
->flags
.q
.uniform
) {
3920 _mesa_glsl_error(loc
, state
,
3921 "`subroutine' may only be applied to uniforms, "
3922 "subroutine type declarations, or function definitions");
3925 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3926 || qual
->flags
.q
.uniform
3927 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3928 var
->data
.read_only
= 1;
3930 if (qual
->flags
.q
.centroid
)
3931 var
->data
.centroid
= 1;
3933 if (qual
->flags
.q
.sample
)
3934 var
->data
.sample
= 1;
3936 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3937 if (state
->es_shader
) {
3938 var
->data
.precision
=
3939 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3942 if (qual
->flags
.q
.patch
)
3943 var
->data
.patch
= 1;
3945 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3946 var
->type
= glsl_type::error_type
;
3947 _mesa_glsl_error(loc
, state
,
3948 "`attribute' variables may not be declared in the "
3950 _mesa_shader_stage_to_string(state
->stage
));
3953 /* Disallow layout qualifiers which may only appear on layout declarations. */
3954 if (qual
->flags
.q
.prim_type
) {
3955 _mesa_glsl_error(loc
, state
,
3956 "Primitive type may only be specified on GS input or output "
3957 "layout declaration, not on variables.");
3960 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3962 * "However, the const qualifier cannot be used with out or inout."
3964 * The same section of the GLSL 4.40 spec further clarifies this saying:
3966 * "The const qualifier cannot be used with out or inout, or a
3967 * compile-time error results."
3969 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3970 _mesa_glsl_error(loc
, state
,
3971 "`const' may not be applied to `out' or `inout' "
3972 "function parameters");
3975 /* If there is no qualifier that changes the mode of the variable, leave
3976 * the setting alone.
3978 assert(var
->data
.mode
!= ir_var_temporary
);
3979 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3980 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
3981 else if (qual
->flags
.q
.in
)
3982 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3983 else if (qual
->flags
.q
.attribute
3984 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3985 var
->data
.mode
= ir_var_shader_in
;
3986 else if (qual
->flags
.q
.out
)
3987 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3988 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3989 var
->data
.mode
= ir_var_shader_out
;
3990 else if (qual
->flags
.q
.uniform
)
3991 var
->data
.mode
= ir_var_uniform
;
3992 else if (qual
->flags
.q
.buffer
)
3993 var
->data
.mode
= ir_var_shader_storage
;
3994 else if (qual
->flags
.q
.shared_storage
)
3995 var
->data
.mode
= ir_var_shader_shared
;
3997 if (!is_parameter
&& state
->has_framebuffer_fetch() &&
3998 state
->stage
== MESA_SHADER_FRAGMENT
) {
3999 if (state
->is_version(130, 300))
4000 var
->data
.fb_fetch_output
= qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
4002 var
->data
.fb_fetch_output
= (strcmp(var
->name
, "gl_LastFragData") == 0);
4005 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
4006 /* User-defined ins/outs are not permitted in compute shaders. */
4007 if (state
->stage
== MESA_SHADER_COMPUTE
) {
4008 _mesa_glsl_error(loc
, state
,
4009 "user-defined input and output variables are not "
4010 "permitted in compute shaders");
4013 /* This variable is being used to link data between shader stages (in
4014 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
4015 * that is allowed for such purposes.
4017 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
4019 * "The varying qualifier can be used only with the data types
4020 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
4023 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
4024 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
4026 * "Fragment inputs can only be signed and unsigned integers and
4027 * integer vectors, float, floating-point vectors, matrices, or
4028 * arrays of these. Structures cannot be input.
4030 * Similar text exists in the section on vertex shader outputs.
4032 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
4033 * 3.00 spec allows structs as well. Varying structs are also allowed
4036 * From section 4.3.4 of the ARB_bindless_texture spec:
4038 * "(modify third paragraph of the section to allow sampler and image
4039 * types) ... Vertex shader inputs can only be float,
4040 * single-precision floating-point scalars, single-precision
4041 * floating-point vectors, matrices, signed and unsigned integers
4042 * and integer vectors, sampler and image types."
4044 * From section 4.3.6 of the ARB_bindless_texture spec:
4046 * "Output variables can only be floating-point scalars,
4047 * floating-point vectors, matrices, signed or unsigned integers or
4048 * integer vectors, sampler or image types, or arrays or structures
4051 switch (var
->type
->without_array()->base_type
) {
4052 case GLSL_TYPE_FLOAT
:
4053 /* Ok in all GLSL versions */
4055 case GLSL_TYPE_UINT
:
4057 if (state
->is_version(130, 300))
4059 _mesa_glsl_error(loc
, state
,
4060 "varying variables must be of base type float in %s",
4061 state
->get_version_string());
4063 case GLSL_TYPE_STRUCT
:
4064 if (state
->is_version(150, 300))
4066 _mesa_glsl_error(loc
, state
,
4067 "varying variables may not be of type struct");
4069 case GLSL_TYPE_DOUBLE
:
4070 case GLSL_TYPE_UINT64
:
4071 case GLSL_TYPE_INT64
:
4073 case GLSL_TYPE_SAMPLER
:
4074 case GLSL_TYPE_IMAGE
:
4075 if (state
->has_bindless())
4079 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
4084 if (state
->all_invariant
&& var
->data
.mode
== ir_var_shader_out
)
4085 var
->data
.invariant
= true;
4087 var
->data
.interpolation
=
4088 interpret_interpolation_qualifier(qual
, var
->type
,
4089 (ir_variable_mode
) var
->data
.mode
,
4092 /* Does the declaration use the deprecated 'attribute' or 'varying'
4095 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
4096 || qual
->flags
.q
.varying
;
4099 /* Validate auxiliary storage qualifiers */
4101 /* From section 4.3.4 of the GLSL 1.30 spec:
4102 * "It is an error to use centroid in in a vertex shader."
4104 * From section 4.3.4 of the GLSL ES 3.00 spec:
4105 * "It is an error to use centroid in or interpolation qualifiers in
4106 * a vertex shader input."
4109 /* Section 4.3.6 of the GLSL 1.30 specification states:
4110 * "It is an error to use centroid out in a fragment shader."
4112 * The GL_ARB_shading_language_420pack extension specification states:
4113 * "It is an error to use auxiliary storage qualifiers or interpolation
4114 * qualifiers on an output in a fragment shader."
4116 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
4117 _mesa_glsl_error(loc
, state
,
4118 "sample qualifier may only be used on `in` or `out` "
4119 "variables between shader stages");
4121 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
4122 _mesa_glsl_error(loc
, state
,
4123 "centroid qualifier may only be used with `in', "
4124 "`out' or `varying' variables between shader stages");
4127 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
4128 _mesa_glsl_error(loc
, state
,
4129 "the shared storage qualifiers can only be used with "
4133 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
4137 * Get the variable that is being redeclared by this declaration or if it
4138 * does not exist, the current declared variable.
4140 * Semantic checks to verify the validity of the redeclaration are also
4141 * performed. If semantic checks fail, compilation error will be emitted via
4142 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
4145 * A pointer to an existing variable in the current scope if the declaration
4146 * is a redeclaration, current variable otherwise. \c is_declared boolean
4147 * will return \c true if the declaration is a redeclaration, \c false
4150 static ir_variable
*
4151 get_variable_being_redeclared(ir_variable
**var_ptr
, YYLTYPE loc
,
4152 struct _mesa_glsl_parse_state
*state
,
4153 bool allow_all_redeclarations
,
4154 bool *is_redeclaration
)
4156 ir_variable
*var
= *var_ptr
;
4158 /* Check if this declaration is actually a re-declaration, either to
4159 * resize an array or add qualifiers to an existing variable.
4161 * This is allowed for variables in the current scope, or when at
4162 * global scope (for built-ins in the implicit outer scope).
4164 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
4165 if (earlier
== NULL
||
4166 (state
->current_function
!= NULL
&&
4167 !state
->symbols
->name_declared_this_scope(var
->name
))) {
4168 *is_redeclaration
= false;
4172 *is_redeclaration
= true;
4174 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4176 * "It is legal to declare an array without a size and then
4177 * later re-declare the same name as an array of the same
4178 * type and specify a size."
4180 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4181 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4182 /* FINISHME: This doesn't match the qualifiers on the two
4183 * FINISHME: declarations. It's not 100% clear whether this is
4184 * FINISHME: required or not.
4187 const int size
= var
->type
->array_size();
4188 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4189 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4190 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4192 earlier
->data
.max_array_access
);
4195 earlier
->type
= var
->type
;
4199 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4200 state
->is_version(150, 0))
4201 && strcmp(var
->name
, "gl_FragCoord") == 0
4202 && earlier
->type
== var
->type
4203 && var
->data
.mode
== ir_var_shader_in
) {
4204 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4207 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
4208 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
4210 /* According to section 4.3.7 of the GLSL 1.30 spec,
4211 * the following built-in varaibles can be redeclared with an
4212 * interpolation qualifier:
4215 * * gl_FrontSecondaryColor
4216 * * gl_BackSecondaryColor
4218 * * gl_SecondaryColor
4220 } else if (state
->is_version(130, 0)
4221 && (strcmp(var
->name
, "gl_FrontColor") == 0
4222 || strcmp(var
->name
, "gl_BackColor") == 0
4223 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4224 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4225 || strcmp(var
->name
, "gl_Color") == 0
4226 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
4227 && earlier
->type
== var
->type
4228 && earlier
->data
.mode
== var
->data
.mode
) {
4229 earlier
->data
.interpolation
= var
->data
.interpolation
;
4231 /* Layout qualifiers for gl_FragDepth. */
4232 } else if ((state
->is_version(420, 0) ||
4233 state
->AMD_conservative_depth_enable
||
4234 state
->ARB_conservative_depth_enable
)
4235 && strcmp(var
->name
, "gl_FragDepth") == 0
4236 && earlier
->type
== var
->type
4237 && earlier
->data
.mode
== var
->data
.mode
) {
4239 /** From the AMD_conservative_depth spec:
4240 * Within any shader, the first redeclarations of gl_FragDepth
4241 * must appear before any use of gl_FragDepth.
4243 if (earlier
->data
.used
) {
4244 _mesa_glsl_error(&loc
, state
,
4245 "the first redeclaration of gl_FragDepth "
4246 "must appear before any use of gl_FragDepth");
4249 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4250 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4251 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4252 _mesa_glsl_error(&loc
, state
,
4253 "gl_FragDepth: depth layout is declared here "
4254 "as '%s, but it was previously declared as "
4256 depth_layout_string(var
->data
.depth_layout
),
4257 depth_layout_string(earlier
->data
.depth_layout
));
4260 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4262 } else if (state
->has_framebuffer_fetch() &&
4263 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4264 var
->type
== earlier
->type
&&
4265 var
->data
.mode
== ir_var_auto
) {
4266 /* According to the EXT_shader_framebuffer_fetch spec:
4268 * "By default, gl_LastFragData is declared with the mediump precision
4269 * qualifier. This can be changed by redeclaring the corresponding
4270 * variables with the desired precision qualifier."
4272 earlier
->data
.precision
= var
->data
.precision
;
4274 } else if (earlier
->data
.how_declared
== ir_var_declared_implicitly
&&
4275 state
->allow_builtin_variable_redeclaration
) {
4276 /* Allow verbatim redeclarations of built-in variables. Not explicitly
4277 * valid, but some applications do it.
4279 if (earlier
->data
.mode
!= var
->data
.mode
&&
4280 !(earlier
->data
.mode
== ir_var_system_value
&&
4281 var
->data
.mode
== ir_var_shader_in
)) {
4282 _mesa_glsl_error(&loc
, state
,
4283 "redeclaration of `%s' with incorrect qualifiers",
4285 } else if (earlier
->type
!= var
->type
) {
4286 _mesa_glsl_error(&loc
, state
,
4287 "redeclaration of `%s' has incorrect type",
4290 } else if (allow_all_redeclarations
) {
4291 if (earlier
->data
.mode
!= var
->data
.mode
) {
4292 _mesa_glsl_error(&loc
, state
,
4293 "redeclaration of `%s' with incorrect qualifiers",
4295 } else if (earlier
->type
!= var
->type
) {
4296 _mesa_glsl_error(&loc
, state
,
4297 "redeclaration of `%s' has incorrect type",
4301 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4308 * Generate the IR for an initializer in a variable declaration
4311 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4312 ast_fully_specified_type
*type
,
4313 exec_list
*initializer_instructions
,
4314 struct _mesa_glsl_parse_state
*state
)
4316 void *mem_ctx
= state
;
4317 ir_rvalue
*result
= NULL
;
4319 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4321 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4323 * "All uniform variables are read-only and are initialized either
4324 * directly by an application via API commands, or indirectly by
4327 if (var
->data
.mode
== ir_var_uniform
) {
4328 state
->check_version(120, 0, &initializer_loc
,
4329 "cannot initialize uniform %s",
4333 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4335 * "Buffer variables cannot have initializers."
4337 if (var
->data
.mode
== ir_var_shader_storage
) {
4338 _mesa_glsl_error(&initializer_loc
, state
,
4339 "cannot initialize buffer variable %s",
4343 /* From section 4.1.7 of the GLSL 4.40 spec:
4345 * "Opaque variables [...] are initialized only through the
4346 * OpenGL API; they cannot be declared with an initializer in a
4349 * From section 4.1.7 of the ARB_bindless_texture spec:
4351 * "Samplers may be declared as shader inputs and outputs, as uniform
4352 * variables, as temporary variables, and as function parameters."
4354 * From section 4.1.X of the ARB_bindless_texture spec:
4356 * "Images may be declared as shader inputs and outputs, as uniform
4357 * variables, as temporary variables, and as function parameters."
4359 if (var
->type
->contains_atomic() ||
4360 (!state
->has_bindless() && var
->type
->contains_opaque())) {
4361 _mesa_glsl_error(&initializer_loc
, state
,
4362 "cannot initialize %s variable %s",
4363 var
->name
, state
->has_bindless() ? "atomic" : "opaque");
4366 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4367 _mesa_glsl_error(&initializer_loc
, state
,
4368 "cannot initialize %s shader input / %s %s",
4369 _mesa_shader_stage_to_string(state
->stage
),
4370 (state
->stage
== MESA_SHADER_VERTEX
)
4371 ? "attribute" : "varying",
4375 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4376 _mesa_glsl_error(&initializer_loc
, state
,
4377 "cannot initialize %s shader output %s",
4378 _mesa_shader_stage_to_string(state
->stage
),
4382 /* If the initializer is an ast_aggregate_initializer, recursively store
4383 * type information from the LHS into it, so that its hir() function can do
4386 if (decl
->initializer
->oper
== ast_aggregate
)
4387 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4389 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4390 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4392 /* Calculate the constant value if this is a const or uniform
4395 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4397 * "Declarations of globals without a storage qualifier, or with
4398 * just the const qualifier, may include initializers, in which case
4399 * they will be initialized before the first line of main() is
4400 * executed. Such initializers must be a constant expression."
4402 * The same section of the GLSL ES 3.00.4 spec has similar language.
4404 if (type
->qualifier
.flags
.q
.constant
4405 || type
->qualifier
.flags
.q
.uniform
4406 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4407 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4409 if (new_rhs
!= NULL
) {
4412 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4415 * "A constant expression is one of
4419 * - an expression formed by an operator on operands that are
4420 * all constant expressions, including getting an element of
4421 * a constant array, or a field of a constant structure, or
4422 * components of a constant vector. However, the sequence
4423 * operator ( , ) and the assignment operators ( =, +=, ...)
4424 * are not included in the operators that can create a
4425 * constant expression."
4427 * Section 12.43 (Sequence operator and constant expressions) says:
4429 * "Should the following construct be allowed?
4433 * The expression within the brackets uses the sequence operator
4434 * (',') and returns the integer 3 so the construct is declaring
4435 * a single-dimensional array of size 3. In some languages, the
4436 * construct declares a two-dimensional array. It would be
4437 * preferable to make this construct illegal to avoid confusion.
4439 * One possibility is to change the definition of the sequence
4440 * operator so that it does not return a constant-expression and
4441 * hence cannot be used to declare an array size.
4443 * RESOLUTION: The result of a sequence operator is not a
4444 * constant-expression."
4446 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4447 * contains language almost identical to the section 4.3.3 in the
4448 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4451 ir_constant
*constant_value
=
4452 rhs
->constant_expression_value(mem_ctx
);
4454 if (!constant_value
||
4455 (state
->is_version(430, 300) &&
4456 decl
->initializer
->has_sequence_subexpression())) {
4457 const char *const variable_mode
=
4458 (type
->qualifier
.flags
.q
.constant
)
4460 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4462 /* If ARB_shading_language_420pack is enabled, initializers of
4463 * const-qualified local variables do not have to be constant
4464 * expressions. Const-qualified global variables must still be
4465 * initialized with constant expressions.
4467 if (!state
->has_420pack()
4468 || state
->current_function
== NULL
) {
4469 _mesa_glsl_error(& initializer_loc
, state
,
4470 "initializer of %s variable `%s' must be a "
4471 "constant expression",
4474 if (var
->type
->is_numeric()) {
4475 /* Reduce cascading errors. */
4476 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4477 ? ir_constant::zero(state
, var
->type
) : NULL
;
4481 rhs
= constant_value
;
4482 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4483 ? constant_value
: NULL
;
4486 if (var
->type
->is_numeric()) {
4487 /* Reduce cascading errors. */
4488 rhs
= var
->constant_value
= type
->qualifier
.flags
.q
.constant
4489 ? ir_constant::zero(state
, var
->type
) : NULL
;
4494 if (rhs
&& !rhs
->type
->is_error()) {
4495 bool temp
= var
->data
.read_only
;
4496 if (type
->qualifier
.flags
.q
.constant
)
4497 var
->data
.read_only
= false;
4499 /* Never emit code to initialize a uniform.
4501 const glsl_type
*initializer_type
;
4502 if (!type
->qualifier
.flags
.q
.uniform
) {
4503 do_assignment(initializer_instructions
, state
,
4508 type
->get_location());
4509 initializer_type
= result
->type
;
4511 initializer_type
= rhs
->type
;
4513 var
->constant_initializer
= rhs
->constant_expression_value(mem_ctx
);
4514 var
->data
.has_initializer
= true;
4516 /* If the declared variable is an unsized array, it must inherrit
4517 * its full type from the initializer. A declaration such as
4519 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4523 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4525 * The assignment generated in the if-statement (below) will also
4526 * automatically handle this case for non-uniforms.
4528 * If the declared variable is not an array, the types must
4529 * already match exactly. As a result, the type assignment
4530 * here can be done unconditionally. For non-uniforms the call
4531 * to do_assignment can change the type of the initializer (via
4532 * the implicit conversion rules). For uniforms the initializer
4533 * must be a constant expression, and the type of that expression
4534 * was validated above.
4536 var
->type
= initializer_type
;
4538 var
->data
.read_only
= temp
;
4545 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4546 YYLTYPE loc
, ir_variable
*var
,
4547 unsigned num_vertices
,
4549 const char *var_category
)
4551 if (var
->type
->is_unsized_array()) {
4552 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4554 * All geometry shader input unsized array declarations will be
4555 * sized by an earlier input layout qualifier, when present, as per
4556 * the following table.
4558 * Followed by a table mapping each allowed input layout qualifier to
4559 * the corresponding input length.
4561 * Similarly for tessellation control shader outputs.
4563 if (num_vertices
!= 0)
4564 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4567 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4568 * includes the following examples of compile-time errors:
4570 * // code sequence within one shader...
4571 * in vec4 Color1[]; // size unknown
4572 * ...Color1.length()...// illegal, length() unknown
4573 * in vec4 Color2[2]; // size is 2
4574 * ...Color1.length()...// illegal, Color1 still has no size
4575 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4576 * layout(lines) in; // legal, input size is 2, matching
4577 * in vec4 Color4[3]; // illegal, contradicts layout
4580 * To detect the case illustrated by Color3, we verify that the size of
4581 * an explicitly-sized array matches the size of any previously declared
4582 * explicitly-sized array. To detect the case illustrated by Color4, we
4583 * verify that the size of an explicitly-sized array is consistent with
4584 * any previously declared input layout.
4586 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4587 _mesa_glsl_error(&loc
, state
,
4588 "%s size contradicts previously declared layout "
4589 "(size is %u, but layout requires a size of %u)",
4590 var_category
, var
->type
->length
, num_vertices
);
4591 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4592 _mesa_glsl_error(&loc
, state
,
4593 "%s sizes are inconsistent (size is %u, but a "
4594 "previous declaration has size %u)",
4595 var_category
, var
->type
->length
, *size
);
4597 *size
= var
->type
->length
;
4603 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4604 YYLTYPE loc
, ir_variable
*var
)
4606 unsigned num_vertices
= 0;
4608 if (state
->tcs_output_vertices_specified
) {
4609 if (!state
->out_qualifier
->vertices
->
4610 process_qualifier_constant(state
, "vertices",
4611 &num_vertices
, false)) {
4615 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4616 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4617 "GL_MAX_PATCH_VERTICES", num_vertices
);
4622 if (!var
->type
->is_array() && !var
->data
.patch
) {
4623 _mesa_glsl_error(&loc
, state
,
4624 "tessellation control shader outputs must be arrays");
4626 /* To avoid cascading failures, short circuit the checks below. */
4630 if (var
->data
.patch
)
4633 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4634 &state
->tcs_output_size
,
4635 "tessellation control shader output");
4639 * Do additional processing necessary for tessellation control/evaluation shader
4640 * input declarations. This covers both interface block arrays and bare input
4644 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4645 YYLTYPE loc
, ir_variable
*var
)
4647 if (!var
->type
->is_array() && !var
->data
.patch
) {
4648 _mesa_glsl_error(&loc
, state
,
4649 "per-vertex tessellation shader inputs must be arrays");
4650 /* Avoid cascading failures. */
4654 if (var
->data
.patch
)
4657 /* The ARB_tessellation_shader spec says:
4659 * "Declaring an array size is optional. If no size is specified, it
4660 * will be taken from the implementation-dependent maximum patch size
4661 * (gl_MaxPatchVertices). If a size is specified, it must match the
4662 * maximum patch size; otherwise, a compile or link error will occur."
4664 * This text appears twice, once for TCS inputs, and again for TES inputs.
4666 if (var
->type
->is_unsized_array()) {
4667 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4668 state
->Const
.MaxPatchVertices
);
4669 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4670 _mesa_glsl_error(&loc
, state
,
4671 "per-vertex tessellation shader input arrays must be "
4672 "sized to gl_MaxPatchVertices (%d).",
4673 state
->Const
.MaxPatchVertices
);
4679 * Do additional processing necessary for geometry shader input declarations
4680 * (this covers both interface blocks arrays and bare input variables).
4683 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4684 YYLTYPE loc
, ir_variable
*var
)
4686 unsigned num_vertices
= 0;
4688 if (state
->gs_input_prim_type_specified
) {
4689 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4692 /* Geometry shader input variables must be arrays. Caller should have
4693 * reported an error for this.
4695 if (!var
->type
->is_array()) {
4696 assert(state
->error
);
4698 /* To avoid cascading failures, short circuit the checks below. */
4702 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4703 &state
->gs_input_size
,
4704 "geometry shader input");
4708 validate_identifier(const char *identifier
, YYLTYPE loc
,
4709 struct _mesa_glsl_parse_state
*state
)
4711 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4713 * "Identifiers starting with "gl_" are reserved for use by
4714 * OpenGL, and may not be declared in a shader as either a
4715 * variable or a function."
4717 if (is_gl_identifier(identifier
)) {
4718 _mesa_glsl_error(&loc
, state
,
4719 "identifier `%s' uses reserved `gl_' prefix",
4721 } else if (strstr(identifier
, "__")) {
4722 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4725 * "In addition, all identifiers containing two
4726 * consecutive underscores (__) are reserved as
4727 * possible future keywords."
4729 * The intention is that names containing __ are reserved for internal
4730 * use by the implementation, and names prefixed with GL_ are reserved
4731 * for use by Khronos. Names simply containing __ are dangerous to use,
4732 * but should be allowed.
4734 * A future version of the GLSL specification will clarify this.
4736 _mesa_glsl_warning(&loc
, state
,
4737 "identifier `%s' uses reserved `__' string",
4743 ast_declarator_list::hir(exec_list
*instructions
,
4744 struct _mesa_glsl_parse_state
*state
)
4747 const struct glsl_type
*decl_type
;
4748 const char *type_name
= NULL
;
4749 ir_rvalue
*result
= NULL
;
4750 YYLTYPE loc
= this->get_location();
4752 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4754 * "To ensure that a particular output variable is invariant, it is
4755 * necessary to use the invariant qualifier. It can either be used to
4756 * qualify a previously declared variable as being invariant
4758 * invariant gl_Position; // make existing gl_Position be invariant"
4760 * In these cases the parser will set the 'invariant' flag in the declarator
4761 * list, and the type will be NULL.
4763 if (this->invariant
) {
4764 assert(this->type
== NULL
);
4766 if (state
->current_function
!= NULL
) {
4767 _mesa_glsl_error(& loc
, state
,
4768 "all uses of `invariant' keyword must be at global "
4772 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4773 assert(decl
->array_specifier
== NULL
);
4774 assert(decl
->initializer
== NULL
);
4776 ir_variable
*const earlier
=
4777 state
->symbols
->get_variable(decl
->identifier
);
4778 if (earlier
== NULL
) {
4779 _mesa_glsl_error(& loc
, state
,
4780 "undeclared variable `%s' cannot be marked "
4781 "invariant", decl
->identifier
);
4782 } else if (!is_allowed_invariant(earlier
, state
)) {
4783 _mesa_glsl_error(&loc
, state
,
4784 "`%s' cannot be marked invariant; interfaces between "
4785 "shader stages only.", decl
->identifier
);
4786 } else if (earlier
->data
.used
) {
4787 _mesa_glsl_error(& loc
, state
,
4788 "variable `%s' may not be redeclared "
4789 "`invariant' after being used",
4792 earlier
->data
.invariant
= true;
4796 /* Invariant redeclarations do not have r-values.
4801 if (this->precise
) {
4802 assert(this->type
== NULL
);
4804 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4805 assert(decl
->array_specifier
== NULL
);
4806 assert(decl
->initializer
== NULL
);
4808 ir_variable
*const earlier
=
4809 state
->symbols
->get_variable(decl
->identifier
);
4810 if (earlier
== NULL
) {
4811 _mesa_glsl_error(& loc
, state
,
4812 "undeclared variable `%s' cannot be marked "
4813 "precise", decl
->identifier
);
4814 } else if (state
->current_function
!= NULL
&&
4815 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4816 /* Note: we have to check if we're in a function, since
4817 * builtins are treated as having come from another scope.
4819 _mesa_glsl_error(& loc
, state
,
4820 "variable `%s' from an outer scope may not be "
4821 "redeclared `precise' in this scope",
4823 } else if (earlier
->data
.used
) {
4824 _mesa_glsl_error(& loc
, state
,
4825 "variable `%s' may not be redeclared "
4826 "`precise' after being used",
4829 earlier
->data
.precise
= true;
4833 /* Precise redeclarations do not have r-values either. */
4837 assert(this->type
!= NULL
);
4838 assert(!this->invariant
);
4839 assert(!this->precise
);
4841 /* The type specifier may contain a structure definition. Process that
4842 * before any of the variable declarations.
4844 (void) this->type
->specifier
->hir(instructions
, state
);
4846 decl_type
= this->type
->glsl_type(& type_name
, state
);
4848 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4849 * "Buffer variables may only be declared inside interface blocks
4850 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4851 * shader storage blocks. It is a compile-time error to declare buffer
4852 * variables at global scope (outside a block)."
4854 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4855 _mesa_glsl_error(&loc
, state
,
4856 "buffer variables cannot be declared outside "
4857 "interface blocks");
4860 /* An offset-qualified atomic counter declaration sets the default
4861 * offset for the next declaration within the same atomic counter
4864 if (decl_type
&& decl_type
->contains_atomic()) {
4865 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4866 type
->qualifier
.flags
.q
.explicit_offset
) {
4867 unsigned qual_binding
;
4868 unsigned qual_offset
;
4869 if (process_qualifier_constant(state
, &loc
, "binding",
4870 type
->qualifier
.binding
,
4872 && process_qualifier_constant(state
, &loc
, "offset",
4873 type
->qualifier
.offset
,
4875 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4879 ast_type_qualifier allowed_atomic_qual_mask
;
4880 allowed_atomic_qual_mask
.flags
.i
= 0;
4881 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4882 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4883 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4885 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4886 "invalid layout qualifier for",
4890 if (this->declarations
.is_empty()) {
4891 /* If there is no structure involved in the program text, there are two
4892 * possible scenarios:
4894 * - The program text contained something like 'vec4;'. This is an
4895 * empty declaration. It is valid but weird. Emit a warning.
4897 * - The program text contained something like 'S;' and 'S' is not the
4898 * name of a known structure type. This is both invalid and weird.
4901 * - The program text contained something like 'mediump float;'
4902 * when the programmer probably meant 'precision mediump
4903 * float;' Emit a warning with a description of what they
4904 * probably meant to do.
4906 * Note that if decl_type is NULL and there is a structure involved,
4907 * there must have been some sort of error with the structure. In this
4908 * case we assume that an error was already generated on this line of
4909 * code for the structure. There is no need to generate an additional,
4912 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4915 if (decl_type
== NULL
) {
4916 _mesa_glsl_error(&loc
, state
,
4917 "invalid type `%s' in empty declaration",
4920 if (decl_type
->is_array()) {
4921 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4924 * "... any declaration that leaves the size undefined is
4925 * disallowed as this would add complexity and there are no
4928 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4929 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4930 "or implicitly defined");
4933 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4935 * "The combinations of types and qualifiers that cause
4936 * compile-time or link-time errors are the same whether or not
4937 * the declaration is empty."
4939 validate_array_dimensions(decl_type
, state
, &loc
);
4942 if (decl_type
->is_atomic_uint()) {
4943 /* Empty atomic counter declarations are allowed and useful
4944 * to set the default offset qualifier.
4947 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4948 if (this->type
->specifier
->structure
!= NULL
) {
4949 _mesa_glsl_error(&loc
, state
,
4950 "precision qualifiers can't be applied "
4953 static const char *const precision_names
[] = {
4960 _mesa_glsl_warning(&loc
, state
,
4961 "empty declaration with precision "
4962 "qualifier, to set the default precision, "
4963 "use `precision %s %s;'",
4964 precision_names
[this->type
->
4965 qualifier
.precision
],
4968 } else if (this->type
->specifier
->structure
== NULL
) {
4969 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4974 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4975 const struct glsl_type
*var_type
;
4977 const char *identifier
= decl
->identifier
;
4978 /* FINISHME: Emit a warning if a variable declaration shadows a
4979 * FINISHME: declaration at a higher scope.
4982 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4983 if (type_name
!= NULL
) {
4984 _mesa_glsl_error(& loc
, state
,
4985 "invalid type `%s' in declaration of `%s'",
4986 type_name
, decl
->identifier
);
4988 _mesa_glsl_error(& loc
, state
,
4989 "invalid type in declaration of `%s'",
4995 if (this->type
->qualifier
.is_subroutine_decl()) {
4999 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
5001 _mesa_glsl_error(& loc
, state
,
5002 "invalid type in declaration of `%s'",
5004 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
5009 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
5012 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
5014 /* The 'varying in' and 'varying out' qualifiers can only be used with
5015 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
5018 if (this->type
->qualifier
.flags
.q
.varying
) {
5019 if (this->type
->qualifier
.flags
.q
.in
) {
5020 _mesa_glsl_error(& loc
, state
,
5021 "`varying in' qualifier in declaration of "
5022 "`%s' only valid for geometry shaders using "
5023 "ARB_geometry_shader4 or EXT_geometry_shader4",
5025 } else if (this->type
->qualifier
.flags
.q
.out
) {
5026 _mesa_glsl_error(& loc
, state
,
5027 "`varying out' qualifier in declaration of "
5028 "`%s' only valid for geometry shaders using "
5029 "ARB_geometry_shader4 or EXT_geometry_shader4",
5034 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
5036 * "Global variables can only use the qualifiers const,
5037 * attribute, uniform, or varying. Only one may be
5040 * Local variables can only use the qualifier const."
5042 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
5043 * any extension that adds the 'layout' keyword.
5045 if (!state
->is_version(130, 300)
5046 && !state
->has_explicit_attrib_location()
5047 && !state
->has_separate_shader_objects()
5048 && !state
->ARB_fragment_coord_conventions_enable
) {
5049 if (this->type
->qualifier
.flags
.q
.out
) {
5050 _mesa_glsl_error(& loc
, state
,
5051 "`out' qualifier in declaration of `%s' "
5052 "only valid for function parameters in %s",
5053 decl
->identifier
, state
->get_version_string());
5055 if (this->type
->qualifier
.flags
.q
.in
) {
5056 _mesa_glsl_error(& loc
, state
,
5057 "`in' qualifier in declaration of `%s' "
5058 "only valid for function parameters in %s",
5059 decl
->identifier
, state
->get_version_string());
5061 /* FINISHME: Test for other invalid qualifiers. */
5064 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
5066 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
5069 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
5070 && (var
->type
->is_numeric() || var
->type
->is_boolean())
5071 && state
->zero_init
) {
5072 const ir_constant_data data
= { { 0 } };
5073 var
->data
.has_initializer
= true;
5074 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
5077 if (this->type
->qualifier
.flags
.q
.invariant
) {
5078 if (!is_allowed_invariant(var
, state
)) {
5079 _mesa_glsl_error(&loc
, state
,
5080 "`%s' cannot be marked invariant; interfaces between "
5081 "shader stages only", var
->name
);
5085 if (state
->current_function
!= NULL
) {
5086 const char *mode
= NULL
;
5087 const char *extra
= "";
5089 /* There is no need to check for 'inout' here because the parser will
5090 * only allow that in function parameter lists.
5092 if (this->type
->qualifier
.flags
.q
.attribute
) {
5094 } else if (this->type
->qualifier
.is_subroutine_decl()) {
5095 mode
= "subroutine uniform";
5096 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
5098 } else if (this->type
->qualifier
.flags
.q
.varying
) {
5100 } else if (this->type
->qualifier
.flags
.q
.in
) {
5102 extra
= " or in function parameter list";
5103 } else if (this->type
->qualifier
.flags
.q
.out
) {
5105 extra
= " or in function parameter list";
5109 _mesa_glsl_error(& loc
, state
,
5110 "%s variable `%s' must be declared at "
5112 mode
, var
->name
, extra
);
5114 } else if (var
->data
.mode
== ir_var_shader_in
) {
5115 var
->data
.read_only
= true;
5117 if (state
->stage
== MESA_SHADER_VERTEX
) {
5118 bool error_emitted
= false;
5120 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
5122 * "Vertex shader inputs can only be float, floating-point
5123 * vectors, matrices, signed and unsigned integers and integer
5124 * vectors. Vertex shader inputs can also form arrays of these
5125 * types, but not structures."
5127 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
5129 * "Vertex shader inputs can only be float, floating-point
5130 * vectors, matrices, signed and unsigned integers and integer
5131 * vectors. They cannot be arrays or structures."
5133 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
5135 * "The attribute qualifier can be used only with float,
5136 * floating-point vectors, and matrices. Attribute variables
5137 * cannot be declared as arrays or structures."
5139 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
5141 * "Vertex shader inputs can only be float, floating-point
5142 * vectors, matrices, signed and unsigned integers and integer
5143 * vectors. Vertex shader inputs cannot be arrays or
5146 * From section 4.3.4 of the ARB_bindless_texture spec:
5148 * "(modify third paragraph of the section to allow sampler and
5149 * image types) ... Vertex shader inputs can only be float,
5150 * single-precision floating-point scalars, single-precision
5151 * floating-point vectors, matrices, signed and unsigned
5152 * integers and integer vectors, sampler and image types."
5154 const glsl_type
*check_type
= var
->type
->without_array();
5156 switch (check_type
->base_type
) {
5157 case GLSL_TYPE_FLOAT
:
5159 case GLSL_TYPE_UINT64
:
5160 case GLSL_TYPE_INT64
:
5162 case GLSL_TYPE_UINT
:
5164 if (state
->is_version(120, 300))
5166 case GLSL_TYPE_DOUBLE
:
5167 if (check_type
->is_double() && (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
5169 case GLSL_TYPE_SAMPLER
:
5170 if (check_type
->is_sampler() && state
->has_bindless())
5172 case GLSL_TYPE_IMAGE
:
5173 if (check_type
->is_image() && state
->has_bindless())
5177 _mesa_glsl_error(& loc
, state
,
5178 "vertex shader input / attribute cannot have "
5180 var
->type
->is_array() ? "array of " : "",
5182 error_emitted
= true;
5185 if (!error_emitted
&& var
->type
->is_array() &&
5186 !state
->check_version(150, 0, &loc
,
5187 "vertex shader input / attribute "
5188 "cannot have array type")) {
5189 error_emitted
= true;
5191 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
5192 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5194 * Geometry shader input variables get the per-vertex values
5195 * written out by vertex shader output variables of the same
5196 * names. Since a geometry shader operates on a set of
5197 * vertices, each input varying variable (or input block, see
5198 * interface blocks below) needs to be declared as an array.
5200 if (!var
->type
->is_array()) {
5201 _mesa_glsl_error(&loc
, state
,
5202 "geometry shader inputs must be arrays");
5205 handle_geometry_shader_input_decl(state
, loc
, var
);
5206 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5207 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5209 * It is a compile-time error to declare a fragment shader
5210 * input with, or that contains, any of the following types:
5214 * * An array of arrays
5215 * * An array of structures
5216 * * A structure containing an array
5217 * * A structure containing a structure
5219 if (state
->es_shader
) {
5220 const glsl_type
*check_type
= var
->type
->without_array();
5221 if (check_type
->is_boolean() ||
5222 check_type
->contains_opaque()) {
5223 _mesa_glsl_error(&loc
, state
,
5224 "fragment shader input cannot have type %s",
5227 if (var
->type
->is_array() &&
5228 var
->type
->fields
.array
->is_array()) {
5229 _mesa_glsl_error(&loc
, state
,
5231 "cannot have an array of arrays",
5232 _mesa_shader_stage_to_string(state
->stage
));
5234 if (var
->type
->is_array() &&
5235 var
->type
->fields
.array
->is_record()) {
5236 _mesa_glsl_error(&loc
, state
,
5237 "fragment shader input "
5238 "cannot have an array of structs");
5240 if (var
->type
->is_record()) {
5241 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5242 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5243 var
->type
->fields
.structure
[i
].type
->is_record())
5244 _mesa_glsl_error(&loc
, state
,
5245 "fragment shader input cannot have "
5246 "a struct that contains an "
5251 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5252 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5253 handle_tess_shader_input_decl(state
, loc
, var
);
5255 } else if (var
->data
.mode
== ir_var_shader_out
) {
5256 const glsl_type
*check_type
= var
->type
->without_array();
5258 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5260 * It is a compile-time error to declare a fragment shader output
5261 * that contains any of the following:
5263 * * A Boolean type (bool, bvec2 ...)
5264 * * A double-precision scalar or vector (double, dvec2 ...)
5269 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5270 if (check_type
->is_record() || check_type
->is_matrix())
5271 _mesa_glsl_error(&loc
, state
,
5272 "fragment shader output "
5273 "cannot have struct or matrix type");
5274 switch (check_type
->base_type
) {
5275 case GLSL_TYPE_UINT
:
5277 case GLSL_TYPE_FLOAT
:
5280 _mesa_glsl_error(&loc
, state
,
5281 "fragment shader output cannot have "
5282 "type %s", check_type
->name
);
5286 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5288 * It is a compile-time error to declare a vertex shader output
5289 * with, or that contains, any of the following types:
5293 * * An array of arrays
5294 * * An array of structures
5295 * * A structure containing an array
5296 * * A structure containing a structure
5298 * It is a compile-time error to declare a fragment shader output
5299 * with, or that contains, any of the following types:
5305 * * An array of array
5307 * ES 3.20 updates this to apply to tessellation and geometry shaders
5308 * as well. Because there are per-vertex arrays in the new stages,
5309 * it strikes the "array of..." rules and replaces them with these:
5311 * * For per-vertex-arrayed variables (applies to tessellation
5312 * control, tessellation evaluation and geometry shaders):
5314 * * Per-vertex-arrayed arrays of arrays
5315 * * Per-vertex-arrayed arrays of structures
5317 * * For non-per-vertex-arrayed variables:
5319 * * An array of arrays
5320 * * An array of structures
5322 * which basically says to unwrap the per-vertex aspect and apply
5325 if (state
->es_shader
) {
5326 if (var
->type
->is_array() &&
5327 var
->type
->fields
.array
->is_array()) {
5328 _mesa_glsl_error(&loc
, state
,
5330 "cannot have an array of arrays",
5331 _mesa_shader_stage_to_string(state
->stage
));
5333 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5334 const glsl_type
*type
= var
->type
;
5336 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5337 !var
->data
.patch
&& var
->type
->is_array()) {
5338 type
= var
->type
->fields
.array
;
5341 if (type
->is_array() && type
->fields
.array
->is_record()) {
5342 _mesa_glsl_error(&loc
, state
,
5343 "%s shader output cannot have "
5344 "an array of structs",
5345 _mesa_shader_stage_to_string(state
->stage
));
5347 if (type
->is_record()) {
5348 for (unsigned i
= 0; i
< type
->length
; i
++) {
5349 if (type
->fields
.structure
[i
].type
->is_array() ||
5350 type
->fields
.structure
[i
].type
->is_record())
5351 _mesa_glsl_error(&loc
, state
,
5352 "%s shader output cannot have a "
5353 "struct that contains an "
5355 _mesa_shader_stage_to_string(state
->stage
));
5361 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5362 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5364 } else if (var
->type
->contains_subroutine()) {
5365 /* declare subroutine uniforms as hidden */
5366 var
->data
.how_declared
= ir_var_hidden
;
5369 /* From section 4.3.4 of the GLSL 4.00 spec:
5370 * "Input variables may not be declared using the patch in qualifier
5371 * in tessellation control or geometry shaders."
5373 * From section 4.3.6 of the GLSL 4.00 spec:
5374 * "It is an error to use patch out in a vertex, tessellation
5375 * evaluation, or geometry shader."
5377 * This doesn't explicitly forbid using them in a fragment shader, but
5378 * that's probably just an oversight.
5380 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5381 && this->type
->qualifier
.flags
.q
.patch
5382 && this->type
->qualifier
.flags
.q
.in
) {
5384 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5385 "tessellation evaluation shader");
5388 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5389 && this->type
->qualifier
.flags
.q
.patch
5390 && this->type
->qualifier
.flags
.q
.out
) {
5392 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5393 "tessellation control shader");
5396 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5398 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5399 state
->check_precision_qualifiers_allowed(&loc
);
5402 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5403 !precision_qualifier_allowed(var
->type
)) {
5404 _mesa_glsl_error(&loc
, state
,
5405 "precision qualifiers apply only to floating point"
5406 ", integer and opaque types");
5409 /* From section 4.1.7 of the GLSL 4.40 spec:
5411 * "[Opaque types] can only be declared as function
5412 * parameters or uniform-qualified variables."
5414 * From section 4.1.7 of the ARB_bindless_texture spec:
5416 * "Samplers may be declared as shader inputs and outputs, as uniform
5417 * variables, as temporary variables, and as function parameters."
5419 * From section 4.1.X of the ARB_bindless_texture spec:
5421 * "Images may be declared as shader inputs and outputs, as uniform
5422 * variables, as temporary variables, and as function parameters."
5424 if (!this->type
->qualifier
.flags
.q
.uniform
&&
5425 (var_type
->contains_atomic() ||
5426 (!state
->has_bindless() && var_type
->contains_opaque()))) {
5427 _mesa_glsl_error(&loc
, state
,
5428 "%s variables must be declared uniform",
5429 state
->has_bindless() ? "atomic" : "opaque");
5432 /* Process the initializer and add its instructions to a temporary
5433 * list. This list will be added to the instruction stream (below) after
5434 * the declaration is added. This is done because in some cases (such as
5435 * redeclarations) the declaration may not actually be added to the
5436 * instruction stream.
5438 exec_list initializer_instructions
;
5440 /* Examine var name here since var may get deleted in the next call */
5441 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5443 bool is_redeclaration
;
5444 var
= get_variable_being_redeclared(&var
, decl
->get_location(), state
,
5445 false /* allow_all_redeclarations */,
5447 if (is_redeclaration
) {
5449 var
->data
.how_declared
== ir_var_declared_in_block
) {
5450 _mesa_glsl_error(&loc
, state
,
5451 "`%s' has already been redeclared using "
5452 "gl_PerVertex", var
->name
);
5454 var
->data
.how_declared
= ir_var_declared_normally
;
5457 if (decl
->initializer
!= NULL
) {
5458 result
= process_initializer(var
,
5460 &initializer_instructions
, state
);
5462 validate_array_dimensions(var_type
, state
, &loc
);
5465 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5467 * "It is an error to write to a const variable outside of
5468 * its declaration, so they must be initialized when
5471 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5472 _mesa_glsl_error(& loc
, state
,
5473 "const declaration of `%s' must be initialized",
5477 if (state
->es_shader
) {
5478 const glsl_type
*const t
= var
->type
;
5480 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5482 * The GL_OES_tessellation_shader spec says about inputs:
5484 * "Declaring an array size is optional. If no size is specified,
5485 * it will be taken from the implementation-dependent maximum
5486 * patch size (gl_MaxPatchVertices)."
5488 * and about TCS outputs:
5490 * "If no size is specified, it will be taken from output patch
5491 * size declared in the shader."
5493 * The GL_OES_geometry_shader spec says:
5495 * "All geometry shader input unsized array declarations will be
5496 * sized by an earlier input primitive layout qualifier, when
5497 * present, as per the following table."
5499 const bool implicitly_sized
=
5500 (var
->data
.mode
== ir_var_shader_in
&&
5501 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5502 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5503 (var
->data
.mode
== ir_var_shader_out
&&
5504 state
->stage
== MESA_SHADER_TESS_CTRL
);
5506 if (t
->is_unsized_array() && !implicitly_sized
)
5507 /* Section 10.17 of the GLSL ES 1.00 specification states that
5508 * unsized array declarations have been removed from the language.
5509 * Arrays that are sized using an initializer are still explicitly
5510 * sized. However, GLSL ES 1.00 does not allow array
5511 * initializers. That is only allowed in GLSL ES 3.00.
5513 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5515 * "An array type can also be formed without specifying a size
5516 * if the definition includes an initializer:
5518 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5519 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5524 _mesa_glsl_error(& loc
, state
,
5525 "unsized array declarations are not allowed in "
5529 /* Section 4.4.6.1 Atomic Counter Layout Qualifiers of the GLSL 4.60 spec:
5531 * "It is a compile-time error to declare an unsized array of
5534 if (var
->type
->is_unsized_array() &&
5535 var
->type
->without_array()->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
5536 _mesa_glsl_error(& loc
, state
,
5537 "Unsized array of atomic_uint is not allowed");
5540 /* If the declaration is not a redeclaration, there are a few additional
5541 * semantic checks that must be applied. In addition, variable that was
5542 * created for the declaration should be added to the IR stream.
5544 if (!is_redeclaration
) {
5545 validate_identifier(decl
->identifier
, loc
, state
);
5547 /* Add the variable to the symbol table. Note that the initializer's
5548 * IR was already processed earlier (though it hasn't been emitted
5549 * yet), without the variable in scope.
5551 * This differs from most C-like languages, but it follows the GLSL
5552 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5555 * "Within a declaration, the scope of a name starts immediately
5556 * after the initializer if present or immediately after the name
5557 * being declared if not."
5559 if (!state
->symbols
->add_variable(var
)) {
5560 YYLTYPE loc
= this->get_location();
5561 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5562 "current scope", decl
->identifier
);
5566 /* Push the variable declaration to the top. It means that all the
5567 * variable declarations will appear in a funny last-to-first order,
5568 * but otherwise we run into trouble if a function is prototyped, a
5569 * global var is decled, then the function is defined with usage of
5570 * the global var. See glslparsertest's CorrectModule.frag.
5572 instructions
->push_head(var
);
5575 instructions
->append_list(&initializer_instructions
);
5579 /* Generally, variable declarations do not have r-values. However,
5580 * one is used for the declaration in
5582 * while (bool b = some_condition()) {
5586 * so we return the rvalue from the last seen declaration here.
5593 ast_parameter_declarator::hir(exec_list
*instructions
,
5594 struct _mesa_glsl_parse_state
*state
)
5597 const struct glsl_type
*type
;
5598 const char *name
= NULL
;
5599 YYLTYPE loc
= this->get_location();
5601 type
= this->type
->glsl_type(& name
, state
);
5605 _mesa_glsl_error(& loc
, state
,
5606 "invalid type `%s' in declaration of `%s'",
5607 name
, this->identifier
);
5609 _mesa_glsl_error(& loc
, state
,
5610 "invalid type in declaration of `%s'",
5614 type
= glsl_type::error_type
;
5617 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5619 * "Functions that accept no input arguments need not use void in the
5620 * argument list because prototypes (or definitions) are required and
5621 * therefore there is no ambiguity when an empty argument list "( )" is
5622 * declared. The idiom "(void)" as a parameter list is provided for
5625 * Placing this check here prevents a void parameter being set up
5626 * for a function, which avoids tripping up checks for main taking
5627 * parameters and lookups of an unnamed symbol.
5629 if (type
->is_void()) {
5630 if (this->identifier
!= NULL
)
5631 _mesa_glsl_error(& loc
, state
,
5632 "named parameter cannot have type `void'");
5638 if (formal_parameter
&& (this->identifier
== NULL
)) {
5639 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5643 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5644 * call already handled the "vec4[..] foo" case.
5646 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5648 if (!type
->is_error() && type
->is_unsized_array()) {
5649 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5651 type
= glsl_type::error_type
;
5655 ir_variable
*var
= new(ctx
)
5656 ir_variable(type
, this->identifier
, ir_var_function_in
);
5658 /* Apply any specified qualifiers to the parameter declaration. Note that
5659 * for function parameters the default mode is 'in'.
5661 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5664 /* From section 4.1.7 of the GLSL 4.40 spec:
5666 * "Opaque variables cannot be treated as l-values; hence cannot
5667 * be used as out or inout function parameters, nor can they be
5670 * From section 4.1.7 of the ARB_bindless_texture spec:
5672 * "Samplers can be used as l-values, so can be assigned into and used
5673 * as "out" and "inout" function parameters."
5675 * From section 4.1.X of the ARB_bindless_texture spec:
5677 * "Images can be used as l-values, so can be assigned into and used as
5678 * "out" and "inout" function parameters."
5680 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5681 && (type
->contains_atomic() ||
5682 (!state
->has_bindless() && type
->contains_opaque()))) {
5683 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5684 "contain %s variables",
5685 state
->has_bindless() ? "atomic" : "opaque");
5686 type
= glsl_type::error_type
;
5689 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5691 * "When calling a function, expressions that do not evaluate to
5692 * l-values cannot be passed to parameters declared as out or inout."
5694 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5696 * "Other binary or unary expressions, non-dereferenced arrays,
5697 * function names, swizzles with repeated fields, and constants
5698 * cannot be l-values."
5700 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5701 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5703 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5705 && !state
->check_version(120, 100, &loc
,
5706 "arrays cannot be out or inout parameters")) {
5707 type
= glsl_type::error_type
;
5710 instructions
->push_tail(var
);
5712 /* Parameter declarations do not have r-values.
5719 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5721 exec_list
*ir_parameters
,
5722 _mesa_glsl_parse_state
*state
)
5724 ast_parameter_declarator
*void_param
= NULL
;
5727 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5728 param
->formal_parameter
= formal
;
5729 param
->hir(ir_parameters
, state
);
5737 if ((void_param
!= NULL
) && (count
> 1)) {
5738 YYLTYPE loc
= void_param
->get_location();
5740 _mesa_glsl_error(& loc
, state
,
5741 "`void' parameter must be only parameter");
5747 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5749 /* IR invariants disallow function declarations or definitions
5750 * nested within other function definitions. But there is no
5751 * requirement about the relative order of function declarations
5752 * and definitions with respect to one another. So simply insert
5753 * the new ir_function block at the end of the toplevel instruction
5756 state
->toplevel_ir
->push_tail(f
);
5761 ast_function::hir(exec_list
*instructions
,
5762 struct _mesa_glsl_parse_state
*state
)
5765 ir_function
*f
= NULL
;
5766 ir_function_signature
*sig
= NULL
;
5767 exec_list hir_parameters
;
5768 YYLTYPE loc
= this->get_location();
5770 const char *const name
= identifier
;
5772 /* New functions are always added to the top-level IR instruction stream,
5773 * so this instruction list pointer is ignored. See also emit_function
5776 (void) instructions
;
5778 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5780 * "Function declarations (prototypes) cannot occur inside of functions;
5781 * they must be at global scope, or for the built-in functions, outside
5782 * the global scope."
5784 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5786 * "User defined functions may only be defined within the global scope."
5788 * Note that this language does not appear in GLSL 1.10.
5790 if ((state
->current_function
!= NULL
) &&
5791 state
->is_version(120, 100)) {
5792 YYLTYPE loc
= this->get_location();
5793 _mesa_glsl_error(&loc
, state
,
5794 "declaration of function `%s' not allowed within "
5795 "function body", name
);
5798 validate_identifier(name
, this->get_location(), state
);
5800 /* Convert the list of function parameters to HIR now so that they can be
5801 * used below to compare this function's signature with previously seen
5802 * signatures for functions with the same name.
5804 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5806 & hir_parameters
, state
);
5808 const char *return_type_name
;
5809 const glsl_type
*return_type
=
5810 this->return_type
->glsl_type(& return_type_name
, state
);
5813 YYLTYPE loc
= this->get_location();
5814 _mesa_glsl_error(&loc
, state
,
5815 "function `%s' has undeclared return type `%s'",
5816 name
, return_type_name
);
5817 return_type
= glsl_type::error_type
;
5820 /* ARB_shader_subroutine states:
5821 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5822 * subroutine(...) to a function declaration."
5824 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
5825 YYLTYPE loc
= this->get_location();
5826 _mesa_glsl_error(&loc
, state
,
5827 "function declaration `%s' cannot have subroutine prepended",
5831 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5832 * "No qualifier is allowed on the return type of a function."
5834 if (this->return_type
->has_qualifiers(state
)) {
5835 YYLTYPE loc
= this->get_location();
5836 _mesa_glsl_error(& loc
, state
,
5837 "function `%s' return type has qualifiers", name
);
5840 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5842 * "Arrays are allowed as arguments and as the return type. In both
5843 * cases, the array must be explicitly sized."
5845 if (return_type
->is_unsized_array()) {
5846 YYLTYPE loc
= this->get_location();
5847 _mesa_glsl_error(& loc
, state
,
5848 "function `%s' return type array must be explicitly "
5852 /* From Section 6.1 (Function Definitions) of the GLSL 1.00 spec:
5854 * "Arrays are allowed as arguments, but not as the return type. [...]
5855 * The return type can also be a structure if the structure does not
5856 * contain an array."
5858 if (state
->language_version
== 100 && return_type
->contains_array()) {
5859 YYLTYPE loc
= this->get_location();
5860 _mesa_glsl_error(& loc
, state
,
5861 "function `%s' return type contains an array", name
);
5864 /* From section 4.1.7 of the GLSL 4.40 spec:
5866 * "[Opaque types] can only be declared as function parameters
5867 * or uniform-qualified variables."
5869 * The ARB_bindless_texture spec doesn't clearly state this, but as it says
5870 * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X,
5871 * (Images)", this should be allowed.
5873 if (return_type
->contains_atomic() ||
5874 (!state
->has_bindless() && return_type
->contains_opaque())) {
5875 YYLTYPE loc
= this->get_location();
5876 _mesa_glsl_error(&loc
, state
,
5877 "function `%s' return type can't contain an %s type",
5878 name
, state
->has_bindless() ? "atomic" : "opaque");
5882 if (return_type
->is_subroutine()) {
5883 YYLTYPE loc
= this->get_location();
5884 _mesa_glsl_error(&loc
, state
,
5885 "function `%s' return type can't be a subroutine type",
5890 /* Create an ir_function if one doesn't already exist. */
5891 f
= state
->symbols
->get_function(name
);
5893 f
= new(ctx
) ir_function(name
);
5894 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
5895 if (!state
->symbols
->add_function(f
)) {
5896 /* This function name shadows a non-function use of the same name. */
5897 YYLTYPE loc
= this->get_location();
5898 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5899 "non-function", name
);
5903 emit_function(state
, f
);
5906 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5908 * "A shader cannot redefine or overload built-in functions."
5910 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5912 * "User code can overload the built-in functions but cannot redefine
5915 if (state
->es_shader
) {
5916 /* Local shader has no exact candidates; check the built-ins. */
5917 _mesa_glsl_initialize_builtin_functions();
5918 if (state
->language_version
>= 300 &&
5919 _mesa_glsl_has_builtin_function(state
, name
)) {
5920 YYLTYPE loc
= this->get_location();
5921 _mesa_glsl_error(& loc
, state
,
5922 "A shader cannot redefine or overload built-in "
5923 "function `%s' in GLSL ES 3.00", name
);
5927 if (state
->language_version
== 100) {
5928 ir_function_signature
*sig
=
5929 _mesa_glsl_find_builtin_function(state
, name
, &hir_parameters
);
5930 if (sig
&& sig
->is_builtin()) {
5931 _mesa_glsl_error(& loc
, state
,
5932 "A shader cannot redefine built-in "
5933 "function `%s' in GLSL ES 1.00", name
);
5938 /* Verify that this function's signature either doesn't match a previously
5939 * seen signature for a function with the same name, or, if a match is found,
5940 * that the previously seen signature does not have an associated definition.
5942 if (state
->es_shader
|| f
->has_user_signature()) {
5943 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5945 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5946 if (badvar
!= NULL
) {
5947 YYLTYPE loc
= this->get_location();
5949 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5950 "qualifiers don't match prototype", name
, badvar
);
5953 if (sig
->return_type
!= return_type
) {
5954 YYLTYPE loc
= this->get_location();
5956 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5957 "match prototype", name
);
5960 if (sig
->is_defined
) {
5961 if (is_definition
) {
5962 YYLTYPE loc
= this->get_location();
5963 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5965 /* We just encountered a prototype that exactly matches a
5966 * function that's already been defined. This is redundant,
5967 * and we should ignore it.
5971 } else if (state
->language_version
== 100 && !is_definition
) {
5972 /* From the GLSL 1.00 spec, section 4.2.7:
5974 * "A particular variable, structure or function declaration
5975 * may occur at most once within a scope with the exception
5976 * that a single function prototype plus the corresponding
5977 * function definition are allowed."
5979 YYLTYPE loc
= this->get_location();
5980 _mesa_glsl_error(&loc
, state
, "function `%s' redeclared", name
);
5985 /* Verify the return type of main() */
5986 if (strcmp(name
, "main") == 0) {
5987 if (! return_type
->is_void()) {
5988 YYLTYPE loc
= this->get_location();
5990 _mesa_glsl_error(& loc
, state
, "main() must return void");
5993 if (!hir_parameters
.is_empty()) {
5994 YYLTYPE loc
= this->get_location();
5996 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
6000 /* Finish storing the information about this new function in its signature.
6003 sig
= new(ctx
) ir_function_signature(return_type
);
6004 f
->add_signature(sig
);
6007 sig
->replace_parameters(&hir_parameters
);
6010 if (this->return_type
->qualifier
.subroutine_list
) {
6013 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
6014 unsigned qual_index
;
6015 if (process_qualifier_constant(state
, &loc
, "index",
6016 this->return_type
->qualifier
.index
,
6018 if (!state
->has_explicit_uniform_location()) {
6019 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
6020 "GL_ARB_explicit_uniform_location or "
6022 } else if (qual_index
>= MAX_SUBROUTINES
) {
6023 _mesa_glsl_error(&loc
, state
,
6024 "invalid subroutine index (%d) index must "
6025 "be a number between 0 and "
6026 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
6027 MAX_SUBROUTINES
- 1);
6029 f
->subroutine_index
= qual_index
;
6034 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
6035 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
6036 f
->num_subroutine_types
);
6038 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
6039 const struct glsl_type
*type
;
6040 /* the subroutine type must be already declared */
6041 type
= state
->symbols
->get_type(decl
->identifier
);
6043 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
6046 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
6047 ir_function
*fn
= state
->subroutine_types
[i
];
6048 ir_function_signature
*tsig
= NULL
;
6050 if (strcmp(fn
->name
, decl
->identifier
))
6053 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
6056 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
6058 if (tsig
->return_type
!= sig
->return_type
) {
6059 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
6063 f
->subroutine_types
[idx
++] = type
;
6065 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
6067 state
->num_subroutines
+ 1);
6068 state
->subroutines
[state
->num_subroutines
] = f
;
6069 state
->num_subroutines
++;
6073 if (this->return_type
->qualifier
.is_subroutine_decl()) {
6074 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
6075 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
6078 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
6080 state
->num_subroutine_types
+ 1);
6081 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
6082 state
->num_subroutine_types
++;
6084 f
->is_subroutine
= true;
6087 /* Function declarations (prototypes) do not have r-values.
6094 ast_function_definition::hir(exec_list
*instructions
,
6095 struct _mesa_glsl_parse_state
*state
)
6097 prototype
->is_definition
= true;
6098 prototype
->hir(instructions
, state
);
6100 ir_function_signature
*signature
= prototype
->signature
;
6101 if (signature
== NULL
)
6104 assert(state
->current_function
== NULL
);
6105 state
->current_function
= signature
;
6106 state
->found_return
= false;
6108 /* Duplicate parameters declared in the prototype as concrete variables.
6109 * Add these to the symbol table.
6111 state
->symbols
->push_scope();
6112 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
6113 assert(var
->as_variable() != NULL
);
6115 /* The only way a parameter would "exist" is if two parameters have
6118 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
6119 YYLTYPE loc
= this->get_location();
6121 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
6123 state
->symbols
->add_variable(var
);
6127 /* Convert the body of the function to HIR. */
6128 this->body
->hir(&signature
->body
, state
);
6129 signature
->is_defined
= true;
6131 state
->symbols
->pop_scope();
6133 assert(state
->current_function
== signature
);
6134 state
->current_function
= NULL
;
6136 if (!signature
->return_type
->is_void() && !state
->found_return
) {
6137 YYLTYPE loc
= this->get_location();
6138 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
6139 "%s, but no return statement",
6140 signature
->function_name(),
6141 signature
->return_type
->name
);
6144 /* Function definitions do not have r-values.
6151 ast_jump_statement::hir(exec_list
*instructions
,
6152 struct _mesa_glsl_parse_state
*state
)
6159 assert(state
->current_function
);
6161 if (opt_return_value
) {
6162 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
6164 /* The value of the return type can be NULL if the shader says
6165 * 'return foo();' and foo() is a function that returns void.
6167 * NOTE: The GLSL spec doesn't say that this is an error. The type
6168 * of the return value is void. If the return type of the function is
6169 * also void, then this should compile without error. Seriously.
6171 const glsl_type
*const ret_type
=
6172 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
6174 /* Implicit conversions are not allowed for return values prior to
6175 * ARB_shading_language_420pack.
6177 if (state
->current_function
->return_type
!= ret_type
) {
6178 YYLTYPE loc
= this->get_location();
6180 if (state
->has_420pack()) {
6181 if (!apply_implicit_conversion(state
->current_function
->return_type
,
6183 _mesa_glsl_error(& loc
, state
,
6184 "could not implicitly convert return value "
6185 "to %s, in function `%s'",
6186 state
->current_function
->return_type
->name
,
6187 state
->current_function
->function_name());
6190 _mesa_glsl_error(& loc
, state
,
6191 "`return' with wrong type %s, in function `%s' "
6194 state
->current_function
->function_name(),
6195 state
->current_function
->return_type
->name
);
6197 } else if (state
->current_function
->return_type
->base_type
==
6199 YYLTYPE loc
= this->get_location();
6201 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
6202 * specs add a clarification:
6204 * "A void function can only use return without a return argument, even if
6205 * the return argument has void type. Return statements only accept values:
6208 * void func2() { return func1(); } // illegal return statement"
6210 _mesa_glsl_error(& loc
, state
,
6211 "void functions can only use `return' without a "
6215 inst
= new(ctx
) ir_return(ret
);
6217 if (state
->current_function
->return_type
->base_type
!=
6219 YYLTYPE loc
= this->get_location();
6221 _mesa_glsl_error(& loc
, state
,
6222 "`return' with no value, in function %s returning "
6224 state
->current_function
->function_name());
6226 inst
= new(ctx
) ir_return
;
6229 state
->found_return
= true;
6230 instructions
->push_tail(inst
);
6235 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6236 YYLTYPE loc
= this->get_location();
6238 _mesa_glsl_error(& loc
, state
,
6239 "`discard' may only appear in a fragment shader");
6241 instructions
->push_tail(new(ctx
) ir_discard
);
6246 if (mode
== ast_continue
&&
6247 state
->loop_nesting_ast
== NULL
) {
6248 YYLTYPE loc
= this->get_location();
6250 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
6251 } else if (mode
== ast_break
&&
6252 state
->loop_nesting_ast
== NULL
&&
6253 state
->switch_state
.switch_nesting_ast
== NULL
) {
6254 YYLTYPE loc
= this->get_location();
6256 _mesa_glsl_error(& loc
, state
,
6257 "break may only appear in a loop or a switch");
6259 /* For a loop, inline the for loop expression again, since we don't
6260 * know where near the end of the loop body the normal copy of it is
6261 * going to be placed. Same goes for the condition for a do-while
6264 if (state
->loop_nesting_ast
!= NULL
&&
6265 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
6266 if (state
->loop_nesting_ast
->rest_expression
) {
6267 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
6270 if (state
->loop_nesting_ast
->mode
==
6271 ast_iteration_statement::ast_do_while
) {
6272 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
6276 if (state
->switch_state
.is_switch_innermost
&&
6277 mode
== ast_continue
) {
6278 /* Set 'continue_inside' to true. */
6279 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6280 ir_dereference_variable
*deref_continue_inside_var
=
6281 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6282 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6285 /* Break out from the switch, continue for the loop will
6286 * be called right after switch. */
6287 ir_loop_jump
*const jump
=
6288 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6289 instructions
->push_tail(jump
);
6291 } else if (state
->switch_state
.is_switch_innermost
&&
6292 mode
== ast_break
) {
6293 /* Force break out of switch by inserting a break. */
6294 ir_loop_jump
*const jump
=
6295 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6296 instructions
->push_tail(jump
);
6298 ir_loop_jump
*const jump
=
6299 new(ctx
) ir_loop_jump((mode
== ast_break
)
6300 ? ir_loop_jump::jump_break
6301 : ir_loop_jump::jump_continue
);
6302 instructions
->push_tail(jump
);
6309 /* Jump instructions do not have r-values.
6316 ast_selection_statement::hir(exec_list
*instructions
,
6317 struct _mesa_glsl_parse_state
*state
)
6321 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6323 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6325 * "Any expression whose type evaluates to a Boolean can be used as the
6326 * conditional expression bool-expression. Vector types are not accepted
6327 * as the expression to if."
6329 * The checks are separated so that higher quality diagnostics can be
6330 * generated for cases where both rules are violated.
6332 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6333 YYLTYPE loc
= this->condition
->get_location();
6335 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6339 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6341 if (then_statement
!= NULL
) {
6342 state
->symbols
->push_scope();
6343 then_statement
->hir(& stmt
->then_instructions
, state
);
6344 state
->symbols
->pop_scope();
6347 if (else_statement
!= NULL
) {
6348 state
->symbols
->push_scope();
6349 else_statement
->hir(& stmt
->else_instructions
, state
);
6350 state
->symbols
->pop_scope();
6353 instructions
->push_tail(stmt
);
6355 /* if-statements do not have r-values.
6362 /** Value of the case label. */
6365 /** Does this label occur after the default? */
6369 * AST for the case label.
6371 * This is only used to generate error messages for duplicate labels.
6373 ast_expression
*ast
;
6376 /* Used for detection of duplicate case values, compare
6377 * given contents directly.
6380 compare_case_value(const void *a
, const void *b
)
6382 return ((struct case_label
*) a
)->value
== ((struct case_label
*) b
)->value
;
6386 /* Used for detection of duplicate case values, just
6387 * returns key contents as is.
6390 key_contents(const void *key
)
6392 return ((struct case_label
*) key
)->value
;
6397 ast_switch_statement::hir(exec_list
*instructions
,
6398 struct _mesa_glsl_parse_state
*state
)
6402 ir_rvalue
*const test_expression
=
6403 this->test_expression
->hir(instructions
, state
);
6405 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6407 * "The type of init-expression in a switch statement must be a
6410 if (!test_expression
->type
->is_scalar() ||
6411 !test_expression
->type
->is_integer()) {
6412 YYLTYPE loc
= this->test_expression
->get_location();
6414 _mesa_glsl_error(& loc
,
6416 "switch-statement expression must be scalar "
6421 /* Track the switch-statement nesting in a stack-like manner.
6423 struct glsl_switch_state saved
= state
->switch_state
;
6425 state
->switch_state
.is_switch_innermost
= true;
6426 state
->switch_state
.switch_nesting_ast
= this;
6427 state
->switch_state
.labels_ht
=
6428 _mesa_hash_table_create(NULL
, key_contents
,
6429 compare_case_value
);
6430 state
->switch_state
.previous_default
= NULL
;
6432 /* Initalize is_fallthru state to false.
6434 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6435 state
->switch_state
.is_fallthru_var
=
6436 new(ctx
) ir_variable(glsl_type::bool_type
,
6437 "switch_is_fallthru_tmp",
6439 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6441 ir_dereference_variable
*deref_is_fallthru_var
=
6442 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6443 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6446 /* Initialize continue_inside state to false.
6448 state
->switch_state
.continue_inside
=
6449 new(ctx
) ir_variable(glsl_type::bool_type
,
6450 "continue_inside_tmp",
6452 instructions
->push_tail(state
->switch_state
.continue_inside
);
6454 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6455 ir_dereference_variable
*deref_continue_inside_var
=
6456 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6457 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6460 state
->switch_state
.run_default
=
6461 new(ctx
) ir_variable(glsl_type::bool_type
,
6464 instructions
->push_tail(state
->switch_state
.run_default
);
6466 /* Loop around the switch is used for flow control. */
6467 ir_loop
* loop
= new(ctx
) ir_loop();
6468 instructions
->push_tail(loop
);
6470 /* Cache test expression.
6472 test_to_hir(&loop
->body_instructions
, state
);
6474 /* Emit code for body of switch stmt.
6476 body
->hir(&loop
->body_instructions
, state
);
6478 /* Insert a break at the end to exit loop. */
6479 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6480 loop
->body_instructions
.push_tail(jump
);
6482 /* If we are inside loop, check if continue got called inside switch. */
6483 if (state
->loop_nesting_ast
!= NULL
) {
6484 ir_dereference_variable
*deref_continue_inside
=
6485 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6486 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6487 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6489 if (state
->loop_nesting_ast
!= NULL
) {
6490 if (state
->loop_nesting_ast
->rest_expression
) {
6491 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6494 if (state
->loop_nesting_ast
->mode
==
6495 ast_iteration_statement::ast_do_while
) {
6496 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6499 irif
->then_instructions
.push_tail(jump
);
6500 instructions
->push_tail(irif
);
6503 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6505 state
->switch_state
= saved
;
6507 /* Switch statements do not have r-values. */
6513 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6514 struct _mesa_glsl_parse_state
*state
)
6518 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6519 * on the switch test case. The first one would be already raised when
6520 * getting the test_expression at ast_switch_statement::hir
6522 test_expression
->set_is_lhs(true);
6523 /* Cache value of test expression. */
6524 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6526 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6529 ir_dereference_variable
*deref_test_var
=
6530 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6532 instructions
->push_tail(state
->switch_state
.test_var
);
6533 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6538 ast_switch_body::hir(exec_list
*instructions
,
6539 struct _mesa_glsl_parse_state
*state
)
6542 stmts
->hir(instructions
, state
);
6544 /* Switch bodies do not have r-values. */
6549 ast_case_statement_list::hir(exec_list
*instructions
,
6550 struct _mesa_glsl_parse_state
*state
)
6552 exec_list default_case
, after_default
, tmp
;
6554 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6555 case_stmt
->hir(&tmp
, state
);
6558 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6559 default_case
.append_list(&tmp
);
6563 /* If default case found, append 'after_default' list. */
6564 if (!default_case
.is_empty())
6565 after_default
.append_list(&tmp
);
6567 instructions
->append_list(&tmp
);
6570 /* Handle the default case. This is done here because default might not be
6571 * the last case. We need to add checks against following cases first to see
6572 * if default should be chosen or not.
6574 if (!default_case
.is_empty()) {
6575 struct hash_entry
*entry
;
6576 ir_factory
body(instructions
, state
);
6578 ir_expression
*cmp
= NULL
;
6580 hash_table_foreach(state
->switch_state
.labels_ht
, entry
) {
6581 const struct case_label
*const l
= (struct case_label
*) entry
->data
;
6583 /* If the switch init-value is the value of one of the labels that
6584 * occurs after the default case, disable execution of the default
6587 if (l
->after_default
) {
6588 ir_constant
*const cnst
=
6589 state
->switch_state
.test_var
->type
->base_type
== GLSL_TYPE_UINT
6590 ? body
.constant(unsigned(l
->value
))
6591 : body
.constant(int(l
->value
));
6594 ? equal(cnst
, state
->switch_state
.test_var
)
6595 : logic_or(cmp
, equal(cnst
, state
->switch_state
.test_var
));
6600 body
.emit(assign(state
->switch_state
.run_default
, logic_not(cmp
)));
6602 body
.emit(assign(state
->switch_state
.run_default
, body
.constant(true)));
6604 /* Append default case and all cases after it. */
6605 instructions
->append_list(&default_case
);
6606 instructions
->append_list(&after_default
);
6609 /* Case statements do not have r-values. */
6614 ast_case_statement::hir(exec_list
*instructions
,
6615 struct _mesa_glsl_parse_state
*state
)
6617 labels
->hir(instructions
, state
);
6619 /* Guard case statements depending on fallthru state. */
6620 ir_dereference_variable
*const deref_fallthru_guard
=
6621 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6622 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6624 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6625 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6627 instructions
->push_tail(test_fallthru
);
6629 /* Case statements do not have r-values. */
6635 ast_case_label_list::hir(exec_list
*instructions
,
6636 struct _mesa_glsl_parse_state
*state
)
6638 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6639 label
->hir(instructions
, state
);
6641 /* Case labels do not have r-values. */
6646 ast_case_label::hir(exec_list
*instructions
,
6647 struct _mesa_glsl_parse_state
*state
)
6649 ir_factory
body(instructions
, state
);
6651 ir_variable
*const fallthru_var
= state
->switch_state
.is_fallthru_var
;
6653 /* If not default case, ... */
6654 if (this->test_value
!= NULL
) {
6655 /* Conditionally set fallthru state based on
6656 * comparison of cached test expression value to case label.
6658 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6659 ir_constant
*label_const
=
6660 label_rval
->constant_expression_value(body
.mem_ctx
);
6663 YYLTYPE loc
= this->test_value
->get_location();
6665 _mesa_glsl_error(& loc
, state
,
6666 "switch statement case label must be a "
6667 "constant expression");
6669 /* Stuff a dummy value in to allow processing to continue. */
6670 label_const
= body
.constant(0);
6673 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6674 &label_const
->value
.u
[0]);
6677 const struct case_label
*const l
=
6678 (struct case_label
*) entry
->data
;
6679 const ast_expression
*const previous_label
= l
->ast
;
6680 YYLTYPE loc
= this->test_value
->get_location();
6682 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6684 loc
= previous_label
->get_location();
6685 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6687 struct case_label
*l
= ralloc(state
->switch_state
.labels_ht
,
6690 l
->value
= label_const
->value
.u
[0];
6691 l
->after_default
= state
->switch_state
.previous_default
!= NULL
;
6692 l
->ast
= this->test_value
;
6694 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6695 &label_const
->value
.u
[0],
6700 /* Create an r-value version of the ir_constant label here (after we may
6701 * have created a fake one in error cases) that can be passed to
6702 * apply_implicit_conversion below.
6704 ir_rvalue
*label
= label_const
;
6706 ir_rvalue
*deref_test_var
=
6707 new(body
.mem_ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6710 * From GLSL 4.40 specification section 6.2 ("Selection"):
6712 * "The type of the init-expression value in a switch statement must
6713 * be a scalar int or uint. The type of the constant-expression value
6714 * in a case label also must be a scalar int or uint. When any pair
6715 * of these values is tested for "equal value" and the types do not
6716 * match, an implicit conversion will be done to convert the int to a
6717 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6720 if (label
->type
!= state
->switch_state
.test_var
->type
) {
6721 YYLTYPE loc
= this->test_value
->get_location();
6723 const glsl_type
*type_a
= label
->type
;
6724 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6726 /* Check if int->uint implicit conversion is supported. */
6727 bool integer_conversion_supported
=
6728 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6731 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6732 !integer_conversion_supported
) {
6733 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6734 "init-expression and case label (%s != %s)",
6735 type_a
->name
, type_b
->name
);
6737 /* Conversion of the case label. */
6738 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6739 if (!apply_implicit_conversion(glsl_type::uint_type
,
6741 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6743 /* Conversion of the init-expression value. */
6744 if (!apply_implicit_conversion(glsl_type::uint_type
,
6745 deref_test_var
, state
))
6746 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6750 /* If the implicit conversion was allowed, the types will already be
6751 * the same. If the implicit conversion wasn't allowed, smash the
6752 * type of the label anyway. This will prevent the expression
6753 * constructor (below) from failing an assertion.
6755 label
->type
= deref_test_var
->type
;
6758 body
.emit(assign(fallthru_var
,
6759 logic_or(fallthru_var
, equal(label
, deref_test_var
))));
6760 } else { /* default case */
6761 if (state
->switch_state
.previous_default
) {
6762 YYLTYPE loc
= this->get_location();
6763 _mesa_glsl_error(& loc
, state
,
6764 "multiple default labels in one switch");
6766 loc
= state
->switch_state
.previous_default
->get_location();
6767 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6769 state
->switch_state
.previous_default
= this;
6771 /* Set fallthru condition on 'run_default' bool. */
6772 body
.emit(assign(fallthru_var
,
6773 logic_or(fallthru_var
,
6774 state
->switch_state
.run_default
)));
6777 /* Case statements do not have r-values. */
6782 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6783 struct _mesa_glsl_parse_state
*state
)
6787 if (condition
!= NULL
) {
6788 ir_rvalue
*const cond
=
6789 condition
->hir(instructions
, state
);
6792 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6793 YYLTYPE loc
= condition
->get_location();
6795 _mesa_glsl_error(& loc
, state
,
6796 "loop condition must be scalar boolean");
6798 /* As the first code in the loop body, generate a block that looks
6799 * like 'if (!condition) break;' as the loop termination condition.
6801 ir_rvalue
*const not_cond
=
6802 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6804 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6806 ir_jump
*const break_stmt
=
6807 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6809 if_stmt
->then_instructions
.push_tail(break_stmt
);
6810 instructions
->push_tail(if_stmt
);
6817 ast_iteration_statement::hir(exec_list
*instructions
,
6818 struct _mesa_glsl_parse_state
*state
)
6822 /* For-loops and while-loops start a new scope, but do-while loops do not.
6824 if (mode
!= ast_do_while
)
6825 state
->symbols
->push_scope();
6827 if (init_statement
!= NULL
)
6828 init_statement
->hir(instructions
, state
);
6830 ir_loop
*const stmt
= new(ctx
) ir_loop();
6831 instructions
->push_tail(stmt
);
6833 /* Track the current loop nesting. */
6834 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6836 state
->loop_nesting_ast
= this;
6838 /* Likewise, indicate that following code is closest to a loop,
6839 * NOT closest to a switch.
6841 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6842 state
->switch_state
.is_switch_innermost
= false;
6844 if (mode
!= ast_do_while
)
6845 condition_to_hir(&stmt
->body_instructions
, state
);
6848 body
->hir(& stmt
->body_instructions
, state
);
6850 if (rest_expression
!= NULL
)
6851 rest_expression
->hir(& stmt
->body_instructions
, state
);
6853 if (mode
== ast_do_while
)
6854 condition_to_hir(&stmt
->body_instructions
, state
);
6856 if (mode
!= ast_do_while
)
6857 state
->symbols
->pop_scope();
6859 /* Restore previous nesting before returning. */
6860 state
->loop_nesting_ast
= nesting_ast
;
6861 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6863 /* Loops do not have r-values.
6870 * Determine if the given type is valid for establishing a default precision
6873 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6875 * "The precision statement
6877 * precision precision-qualifier type;
6879 * can be used to establish a default precision qualifier. The type field
6880 * can be either int or float or any of the sampler types, and the
6881 * precision-qualifier can be lowp, mediump, or highp."
6883 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6884 * qualifiers on sampler types, but this seems like an oversight (since the
6885 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6886 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6890 is_valid_default_precision_type(const struct glsl_type
*const type
)
6895 switch (type
->base_type
) {
6897 case GLSL_TYPE_FLOAT
:
6898 /* "int" and "float" are valid, but vectors and matrices are not. */
6899 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6900 case GLSL_TYPE_SAMPLER
:
6901 case GLSL_TYPE_IMAGE
:
6902 case GLSL_TYPE_ATOMIC_UINT
:
6911 ast_type_specifier::hir(exec_list
*instructions
,
6912 struct _mesa_glsl_parse_state
*state
)
6914 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6917 YYLTYPE loc
= this->get_location();
6919 /* If this is a precision statement, check that the type to which it is
6920 * applied is either float or int.
6922 * From section 4.5.3 of the GLSL 1.30 spec:
6923 * "The precision statement
6924 * precision precision-qualifier type;
6925 * can be used to establish a default precision qualifier. The type
6926 * field can be either int or float [...]. Any other types or
6927 * qualifiers will result in an error.
6929 if (this->default_precision
!= ast_precision_none
) {
6930 if (!state
->check_precision_qualifiers_allowed(&loc
))
6933 if (this->structure
!= NULL
) {
6934 _mesa_glsl_error(&loc
, state
,
6935 "precision qualifiers do not apply to structures");
6939 if (this->array_specifier
!= NULL
) {
6940 _mesa_glsl_error(&loc
, state
,
6941 "default precision statements do not apply to "
6946 const struct glsl_type
*const type
=
6947 state
->symbols
->get_type(this->type_name
);
6948 if (!is_valid_default_precision_type(type
)) {
6949 _mesa_glsl_error(&loc
, state
,
6950 "default precision statements apply only to "
6951 "float, int, and opaque types");
6955 if (state
->es_shader
) {
6956 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6959 * "Non-precision qualified declarations will use the precision
6960 * qualifier specified in the most recent precision statement
6961 * that is still in scope. The precision statement has the same
6962 * scoping rules as variable declarations. If it is declared
6963 * inside a compound statement, its effect stops at the end of
6964 * the innermost statement it was declared in. Precision
6965 * statements in nested scopes override precision statements in
6966 * outer scopes. Multiple precision statements for the same basic
6967 * type can appear inside the same scope, with later statements
6968 * overriding earlier statements within that scope."
6970 * Default precision specifications follow the same scope rules as
6971 * variables. So, we can track the state of the default precision
6972 * qualifiers in the symbol table, and the rules will just work. This
6973 * is a slight abuse of the symbol table, but it has the semantics
6976 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6977 this->default_precision
);
6980 /* FINISHME: Translate precision statements into IR. */
6984 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6985 * process_record_constructor() can do type-checking on C-style initializer
6986 * expressions of structs, but ast_struct_specifier should only be translated
6987 * to HIR if it is declaring the type of a structure.
6989 * The ->is_declaration field is false for initializers of variables
6990 * declared separately from the struct's type definition.
6992 * struct S { ... }; (is_declaration = true)
6993 * struct T { ... } t = { ... }; (is_declaration = true)
6994 * S s = { ... }; (is_declaration = false)
6996 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6997 return this->structure
->hir(instructions
, state
);
7004 * Process a structure or interface block tree into an array of structure fields
7006 * After parsing, where there are some syntax differnces, structures and
7007 * interface blocks are almost identical. They are similar enough that the
7008 * AST for each can be processed the same way into a set of
7009 * \c glsl_struct_field to describe the members.
7011 * If we're processing an interface block, var_mode should be the type of the
7012 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
7013 * ir_var_shader_storage). If we're processing a structure, var_mode should be
7017 * The number of fields processed. A pointer to the array structure fields is
7018 * stored in \c *fields_ret.
7021 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
7022 struct _mesa_glsl_parse_state
*state
,
7023 exec_list
*declarations
,
7024 glsl_struct_field
**fields_ret
,
7026 enum glsl_matrix_layout matrix_layout
,
7027 bool allow_reserved_names
,
7028 ir_variable_mode var_mode
,
7029 ast_type_qualifier
*layout
,
7030 unsigned block_stream
,
7031 unsigned block_xfb_buffer
,
7032 unsigned block_xfb_offset
,
7033 unsigned expl_location
,
7034 unsigned expl_align
)
7036 unsigned decl_count
= 0;
7037 unsigned next_offset
= 0;
7039 /* Make an initial pass over the list of fields to determine how
7040 * many there are. Each element in this list is an ast_declarator_list.
7041 * This means that we actually need to count the number of elements in the
7042 * 'declarations' list in each of the elements.
7044 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7045 decl_count
+= decl_list
->declarations
.length();
7048 /* Allocate storage for the fields and process the field
7049 * declarations. As the declarations are processed, try to also convert
7050 * the types to HIR. This ensures that structure definitions embedded in
7051 * other structure definitions or in interface blocks are processed.
7053 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
7056 bool first_member
= true;
7057 bool first_member_has_explicit_location
= false;
7060 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7061 const char *type_name
;
7062 YYLTYPE loc
= decl_list
->get_location();
7064 decl_list
->type
->specifier
->hir(instructions
, state
);
7066 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
7068 * "Anonymous structures are not supported; so embedded structures
7069 * must have a declarator. A name given to an embedded struct is
7070 * scoped at the same level as the struct it is embedded in."
7072 * The same section of the GLSL 1.20 spec says:
7074 * "Anonymous structures are not supported. Embedded structures are
7077 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
7078 * embedded structures in 1.10 only.
7080 if (state
->language_version
!= 110 &&
7081 decl_list
->type
->specifier
->structure
!= NULL
)
7082 _mesa_glsl_error(&loc
, state
,
7083 "embedded structure declarations are not allowed");
7085 const glsl_type
*decl_type
=
7086 decl_list
->type
->glsl_type(& type_name
, state
);
7088 const struct ast_type_qualifier
*const qual
=
7089 &decl_list
->type
->qualifier
;
7091 /* From section 4.3.9 of the GLSL 4.40 spec:
7093 * "[In interface blocks] opaque types are not allowed."
7095 * It should be impossible for decl_type to be NULL here. Cases that
7096 * might naturally lead to decl_type being NULL, especially for the
7097 * is_interface case, will have resulted in compilation having
7098 * already halted due to a syntax error.
7103 /* From section 4.3.7 of the ARB_bindless_texture spec:
7105 * "(remove the following bullet from the last list on p. 39,
7106 * thereby permitting sampler types in interface blocks; image
7107 * types are also permitted in blocks by this extension)"
7109 * * sampler types are not allowed
7111 if (decl_type
->contains_atomic() ||
7112 (!state
->has_bindless() && decl_type
->contains_opaque())) {
7113 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
7114 "interface block contains %s variable",
7115 state
->has_bindless() ? "atomic" : "opaque");
7118 if (decl_type
->contains_atomic()) {
7119 /* From section 4.1.7.3 of the GLSL 4.40 spec:
7121 * "Members of structures cannot be declared as atomic counter
7124 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
7127 if (!state
->has_bindless() && decl_type
->contains_image()) {
7128 /* FINISHME: Same problem as with atomic counters.
7129 * FINISHME: Request clarification from Khronos and add
7130 * FINISHME: spec quotation here.
7132 _mesa_glsl_error(&loc
, state
, "image in structure");
7136 if (qual
->flags
.q
.explicit_binding
) {
7137 _mesa_glsl_error(&loc
, state
,
7138 "binding layout qualifier cannot be applied "
7139 "to struct or interface block members");
7143 if (!first_member
) {
7144 if (!layout
->flags
.q
.explicit_location
&&
7145 ((first_member_has_explicit_location
&&
7146 !qual
->flags
.q
.explicit_location
) ||
7147 (!first_member_has_explicit_location
&&
7148 qual
->flags
.q
.explicit_location
))) {
7149 _mesa_glsl_error(&loc
, state
,
7150 "when block-level location layout qualifier "
7151 "is not supplied either all members must "
7152 "have a location layout qualifier or all "
7153 "members must not have a location layout "
7157 first_member
= false;
7158 first_member_has_explicit_location
=
7159 qual
->flags
.q
.explicit_location
;
7163 if (qual
->flags
.q
.std140
||
7164 qual
->flags
.q
.std430
||
7165 qual
->flags
.q
.packed
||
7166 qual
->flags
.q
.shared
) {
7167 _mesa_glsl_error(&loc
, state
,
7168 "uniform/shader storage block layout qualifiers "
7169 "std140, std430, packed, and shared can only be "
7170 "applied to uniform/shader storage blocks, not "
7174 if (qual
->flags
.q
.constant
) {
7175 _mesa_glsl_error(&loc
, state
,
7176 "const storage qualifier cannot be applied "
7177 "to struct or interface block members");
7180 validate_memory_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7181 validate_image_format_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7183 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
7185 * "A block member may be declared with a stream identifier, but
7186 * the specified stream must match the stream associated with the
7187 * containing block."
7189 if (qual
->flags
.q
.explicit_stream
) {
7190 unsigned qual_stream
;
7191 if (process_qualifier_constant(state
, &loc
, "stream",
7192 qual
->stream
, &qual_stream
) &&
7193 qual_stream
!= block_stream
) {
7194 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
7195 "interface block member does not match "
7196 "the interface block (%u vs %u)", qual_stream
,
7202 unsigned explicit_xfb_buffer
= 0;
7203 if (qual
->flags
.q
.explicit_xfb_buffer
) {
7204 unsigned qual_xfb_buffer
;
7205 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
7206 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
7207 explicit_xfb_buffer
= 1;
7208 if (qual_xfb_buffer
!= block_xfb_buffer
)
7209 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
7210 "interface block member does not match "
7211 "the interface block (%u vs %u)",
7212 qual_xfb_buffer
, block_xfb_buffer
);
7214 xfb_buffer
= (int) qual_xfb_buffer
;
7217 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
7218 xfb_buffer
= (int) block_xfb_buffer
;
7221 int xfb_stride
= -1;
7222 if (qual
->flags
.q
.explicit_xfb_stride
) {
7223 unsigned qual_xfb_stride
;
7224 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
7225 qual
->xfb_stride
, &qual_xfb_stride
)) {
7226 xfb_stride
= (int) qual_xfb_stride
;
7230 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
7231 _mesa_glsl_error(&loc
, state
,
7232 "interpolation qualifiers cannot be used "
7233 "with uniform interface blocks");
7236 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
7237 qual
->has_auxiliary_storage()) {
7238 _mesa_glsl_error(&loc
, state
,
7239 "auxiliary storage qualifiers cannot be used "
7240 "in uniform blocks or structures.");
7243 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
7244 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
7245 _mesa_glsl_error(&loc
, state
,
7246 "row_major and column_major can only be "
7247 "applied to interface blocks");
7249 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
7252 foreach_list_typed (ast_declaration
, decl
, link
,
7253 &decl_list
->declarations
) {
7254 YYLTYPE loc
= decl
->get_location();
7256 if (!allow_reserved_names
)
7257 validate_identifier(decl
->identifier
, loc
, state
);
7259 const struct glsl_type
*field_type
=
7260 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
7261 validate_array_dimensions(field_type
, state
, &loc
);
7262 fields
[i
].type
= field_type
;
7263 fields
[i
].name
= decl
->identifier
;
7264 fields
[i
].interpolation
=
7265 interpret_interpolation_qualifier(qual
, field_type
,
7266 var_mode
, state
, &loc
);
7267 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
7268 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
7269 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
7270 fields
[i
].precision
= qual
->precision
;
7271 fields
[i
].offset
= -1;
7272 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
7273 fields
[i
].xfb_buffer
= xfb_buffer
;
7274 fields
[i
].xfb_stride
= xfb_stride
;
7276 if (qual
->flags
.q
.explicit_location
) {
7277 unsigned qual_location
;
7278 if (process_qualifier_constant(state
, &loc
, "location",
7279 qual
->location
, &qual_location
)) {
7280 fields
[i
].location
= qual_location
+
7281 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
7282 expl_location
= fields
[i
].location
+
7283 fields
[i
].type
->count_attribute_slots(false);
7286 if (layout
&& layout
->flags
.q
.explicit_location
) {
7287 fields
[i
].location
= expl_location
;
7288 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
7290 fields
[i
].location
= -1;
7294 /* Offset can only be used with std430 and std140 layouts an initial
7295 * value of 0 is used for error detection.
7301 if (qual
->flags
.q
.row_major
||
7302 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7308 if(layout
->flags
.q
.std140
) {
7309 align
= field_type
->std140_base_alignment(row_major
);
7310 size
= field_type
->std140_size(row_major
);
7311 } else if (layout
->flags
.q
.std430
) {
7312 align
= field_type
->std430_base_alignment(row_major
);
7313 size
= field_type
->std430_size(row_major
);
7317 if (qual
->flags
.q
.explicit_offset
) {
7318 unsigned qual_offset
;
7319 if (process_qualifier_constant(state
, &loc
, "offset",
7320 qual
->offset
, &qual_offset
)) {
7321 if (align
!= 0 && size
!= 0) {
7322 if (next_offset
> qual_offset
)
7323 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7324 "offset overlaps previous member");
7326 if (qual_offset
% align
) {
7327 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7328 "must be a multiple of the base "
7329 "alignment of %s", field_type
->name
);
7331 fields
[i
].offset
= qual_offset
;
7332 next_offset
= glsl_align(qual_offset
+ size
, align
);
7334 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7335 "with std430 and std140 layouts");
7340 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7341 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7343 if (align
== 0 || size
== 0) {
7344 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7345 "std430 and std140 layouts");
7346 } else if (qual
->flags
.q
.explicit_align
) {
7347 unsigned member_align
;
7348 if (process_qualifier_constant(state
, &loc
, "align",
7349 qual
->align
, &member_align
)) {
7350 if (member_align
== 0 ||
7351 member_align
& (member_align
- 1)) {
7352 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7353 "in not a power of 2");
7355 fields
[i
].offset
= glsl_align(offset
, member_align
);
7356 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7360 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7361 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7363 } else if (!qual
->flags
.q
.explicit_offset
) {
7364 if (align
!= 0 && size
!= 0)
7365 next_offset
= glsl_align(next_offset
+ size
, align
);
7368 /* From the ARB_enhanced_layouts spec:
7370 * "The given offset applies to the first component of the first
7371 * member of the qualified entity. Then, within the qualified
7372 * entity, subsequent components are each assigned, in order, to
7373 * the next available offset aligned to a multiple of that
7374 * component's size. Aggregate types are flattened down to the
7375 * component level to get this sequence of components."
7377 if (qual
->flags
.q
.explicit_xfb_offset
) {
7378 unsigned xfb_offset
;
7379 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7380 qual
->offset
, &xfb_offset
)) {
7381 fields
[i
].offset
= xfb_offset
;
7382 block_xfb_offset
= fields
[i
].offset
+
7383 4 * field_type
->component_slots();
7386 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7387 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7388 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7389 block_xfb_offset
+= 4 * field_type
->component_slots();
7393 /* Propogate row- / column-major information down the fields of the
7394 * structure or interface block. Structures need this data because
7395 * the structure may contain a structure that contains ... a matrix
7396 * that need the proper layout.
7398 if (is_interface
&& layout
&&
7399 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7400 (field_type
->without_array()->is_matrix()
7401 || field_type
->without_array()->is_record())) {
7402 /* If no layout is specified for the field, inherit the layout
7405 fields
[i
].matrix_layout
= matrix_layout
;
7407 if (qual
->flags
.q
.row_major
)
7408 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7409 else if (qual
->flags
.q
.column_major
)
7410 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7412 /* If we're processing an uniform or buffer block, the matrix
7413 * layout must be decided by this point.
7415 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7416 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7419 /* Memory qualifiers are allowed on buffer and image variables, while
7420 * the format qualifier is only accepted for images.
7422 if (var_mode
== ir_var_shader_storage
||
7423 field_type
->without_array()->is_image()) {
7424 /* For readonly and writeonly qualifiers the field definition,
7425 * if set, overwrites the layout qualifier.
7427 if (qual
->flags
.q
.read_only
|| qual
->flags
.q
.write_only
) {
7428 fields
[i
].memory_read_only
= qual
->flags
.q
.read_only
;
7429 fields
[i
].memory_write_only
= qual
->flags
.q
.write_only
;
7431 fields
[i
].memory_read_only
=
7432 layout
? layout
->flags
.q
.read_only
: 0;
7433 fields
[i
].memory_write_only
=
7434 layout
? layout
->flags
.q
.write_only
: 0;
7437 /* For other qualifiers, we set the flag if either the layout
7438 * qualifier or the field qualifier are set
7440 fields
[i
].memory_coherent
= qual
->flags
.q
.coherent
||
7441 (layout
&& layout
->flags
.q
.coherent
);
7442 fields
[i
].memory_volatile
= qual
->flags
.q
._volatile
||
7443 (layout
&& layout
->flags
.q
._volatile
);
7444 fields
[i
].memory_restrict
= qual
->flags
.q
.restrict_flag
||
7445 (layout
&& layout
->flags
.q
.restrict_flag
);
7447 if (field_type
->without_array()->is_image()) {
7448 if (qual
->flags
.q
.explicit_image_format
) {
7449 if (qual
->image_base_type
!=
7450 field_type
->without_array()->sampled_type
) {
7451 _mesa_glsl_error(&loc
, state
, "format qualifier doesn't "
7452 "match the base data type of the image");
7455 fields
[i
].image_format
= qual
->image_format
;
7457 if (!qual
->flags
.q
.write_only
) {
7458 _mesa_glsl_error(&loc
, state
, "image not qualified with "
7459 "`writeonly' must have a format layout "
7463 fields
[i
].image_format
= GL_NONE
;
7472 assert(i
== decl_count
);
7474 *fields_ret
= fields
;
7480 ast_struct_specifier::hir(exec_list
*instructions
,
7481 struct _mesa_glsl_parse_state
*state
)
7483 YYLTYPE loc
= this->get_location();
7485 unsigned expl_location
= 0;
7486 if (layout
&& layout
->flags
.q
.explicit_location
) {
7487 if (!process_qualifier_constant(state
, &loc
, "location",
7488 layout
->location
, &expl_location
)) {
7491 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7495 glsl_struct_field
*fields
;
7496 unsigned decl_count
=
7497 ast_process_struct_or_iface_block_members(instructions
,
7499 &this->declarations
,
7502 GLSL_MATRIX_LAYOUT_INHERITED
,
7503 false /* allow_reserved_names */,
7506 0, /* for interface only */
7507 0, /* for interface only */
7508 0, /* for interface only */
7510 0 /* for interface only */);
7512 validate_identifier(this->name
, loc
, state
);
7514 type
= glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7516 if (!type
->is_anonymous() && !state
->symbols
->add_type(name
, type
)) {
7517 const glsl_type
*match
= state
->symbols
->get_type(name
);
7518 /* allow struct matching for desktop GL - older UE4 does this */
7519 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(type
, false))
7520 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7522 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7524 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7526 state
->num_user_structures
+ 1);
7528 s
[state
->num_user_structures
] = type
;
7529 state
->user_structures
= s
;
7530 state
->num_user_structures
++;
7534 /* Structure type definitions do not have r-values.
7541 * Visitor class which detects whether a given interface block has been used.
7543 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7546 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7547 : mode(mode
), block(block
), found(false)
7551 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7553 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7557 return visit_continue
;
7560 bool usage_found() const
7566 ir_variable_mode mode
;
7567 const glsl_type
*block
;
7572 is_unsized_array_last_element(ir_variable
*v
)
7574 const glsl_type
*interface_type
= v
->get_interface_type();
7575 int length
= interface_type
->length
;
7577 assert(v
->type
->is_unsized_array());
7579 /* Check if it is the last element of the interface */
7580 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7586 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7588 var
->data
.memory_read_only
= field
.memory_read_only
;
7589 var
->data
.memory_write_only
= field
.memory_write_only
;
7590 var
->data
.memory_coherent
= field
.memory_coherent
;
7591 var
->data
.memory_volatile
= field
.memory_volatile
;
7592 var
->data
.memory_restrict
= field
.memory_restrict
;
7596 ast_interface_block::hir(exec_list
*instructions
,
7597 struct _mesa_glsl_parse_state
*state
)
7599 YYLTYPE loc
= this->get_location();
7601 /* Interface blocks must be declared at global scope */
7602 if (state
->current_function
!= NULL
) {
7603 _mesa_glsl_error(&loc
, state
,
7604 "Interface block `%s' must be declared "
7609 /* Validate qualifiers:
7611 * - Layout Qualifiers as per the table in Section 4.4
7612 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7614 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7617 * "Additionally, memory qualifiers may also be used in the declaration
7618 * of shader storage blocks"
7620 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7621 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7622 * Layout Qualifiers) of the GLSL 4.50 spec says:
7624 * "The std430 qualifier is supported only for shader storage blocks;
7625 * using std430 on a uniform block will result in a compile-time error."
7627 ast_type_qualifier allowed_blk_qualifiers
;
7628 allowed_blk_qualifiers
.flags
.i
= 0;
7629 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7630 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7631 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7632 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7633 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7634 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7635 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7636 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7637 if (this->layout
.flags
.q
.buffer
) {
7638 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7639 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7640 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7641 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7642 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7643 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7644 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7646 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7649 /* Interface block */
7650 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7652 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7653 if (this->layout
.flags
.q
.out
) {
7654 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7655 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7656 state
->stage
== MESA_SHADER_TESS_CTRL
||
7657 state
->stage
== MESA_SHADER_TESS_EVAL
||
7658 state
->stage
== MESA_SHADER_VERTEX
) {
7659 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7660 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7661 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7662 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7663 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7664 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7665 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7666 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7668 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7669 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7673 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7674 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7675 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7680 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7681 "invalid qualifier for block",
7684 enum glsl_interface_packing packing
;
7685 if (this->layout
.flags
.q
.std140
) {
7686 packing
= GLSL_INTERFACE_PACKING_STD140
;
7687 } else if (this->layout
.flags
.q
.packed
) {
7688 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7689 } else if (this->layout
.flags
.q
.std430
) {
7690 packing
= GLSL_INTERFACE_PACKING_STD430
;
7692 /* The default layout is shared.
7694 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7697 ir_variable_mode var_mode
;
7698 const char *iface_type_name
;
7699 if (this->layout
.flags
.q
.in
) {
7700 var_mode
= ir_var_shader_in
;
7701 iface_type_name
= "in";
7702 } else if (this->layout
.flags
.q
.out
) {
7703 var_mode
= ir_var_shader_out
;
7704 iface_type_name
= "out";
7705 } else if (this->layout
.flags
.q
.uniform
) {
7706 var_mode
= ir_var_uniform
;
7707 iface_type_name
= "uniform";
7708 } else if (this->layout
.flags
.q
.buffer
) {
7709 var_mode
= ir_var_shader_storage
;
7710 iface_type_name
= "buffer";
7712 var_mode
= ir_var_auto
;
7713 iface_type_name
= "UNKNOWN";
7714 assert(!"interface block layout qualifier not found!");
7717 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7718 if (this->layout
.flags
.q
.row_major
)
7719 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7720 else if (this->layout
.flags
.q
.column_major
)
7721 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7723 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7724 exec_list declared_variables
;
7725 glsl_struct_field
*fields
;
7727 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7728 * that we don't have incompatible qualifiers
7730 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7731 _mesa_glsl_error(&loc
, state
,
7732 "Interface block sets both readonly and writeonly");
7735 unsigned qual_stream
;
7736 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7738 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7739 /* If the stream qualifier is invalid it doesn't make sense to continue
7740 * on and try to compare stream layouts on member variables against it
7741 * so just return early.
7746 unsigned qual_xfb_buffer
;
7747 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7748 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7749 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7753 unsigned qual_xfb_offset
;
7754 if (layout
.flags
.q
.explicit_xfb_offset
) {
7755 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7756 layout
.offset
, &qual_xfb_offset
)) {
7761 unsigned qual_xfb_stride
;
7762 if (layout
.flags
.q
.explicit_xfb_stride
) {
7763 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7764 layout
.xfb_stride
, &qual_xfb_stride
)) {
7769 unsigned expl_location
= 0;
7770 if (layout
.flags
.q
.explicit_location
) {
7771 if (!process_qualifier_constant(state
, &loc
, "location",
7772 layout
.location
, &expl_location
)) {
7775 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7776 : VARYING_SLOT_VAR0
;
7780 unsigned expl_align
= 0;
7781 if (layout
.flags
.q
.explicit_align
) {
7782 if (!process_qualifier_constant(state
, &loc
, "align",
7783 layout
.align
, &expl_align
)) {
7786 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7787 _mesa_glsl_error(&loc
, state
, "align layout qualifier is not a "
7794 unsigned int num_variables
=
7795 ast_process_struct_or_iface_block_members(&declared_variables
,
7797 &this->declarations
,
7801 redeclaring_per_vertex
,
7810 if (!redeclaring_per_vertex
) {
7811 validate_identifier(this->block_name
, loc
, state
);
7813 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7815 * "Block names have no other use within a shader beyond interface
7816 * matching; it is a compile-time error to use a block name at global
7817 * scope for anything other than as a block name."
7819 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7820 if (var
&& !var
->type
->is_interface()) {
7821 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7822 "already used in the scope.",
7827 const glsl_type
*earlier_per_vertex
= NULL
;
7828 if (redeclaring_per_vertex
) {
7829 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7830 * the named interface block gl_in, we can find it by looking at the
7831 * previous declaration of gl_in. Otherwise we can find it by looking
7832 * at the previous decalartion of any of the built-in outputs,
7835 * Also check that the instance name and array-ness of the redeclaration
7839 case ir_var_shader_in
:
7840 if (ir_variable
*earlier_gl_in
=
7841 state
->symbols
->get_variable("gl_in")) {
7842 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7844 _mesa_glsl_error(&loc
, state
,
7845 "redeclaration of gl_PerVertex input not allowed "
7847 _mesa_shader_stage_to_string(state
->stage
));
7849 if (this->instance_name
== NULL
||
7850 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7851 !this->array_specifier
->is_single_dimension()) {
7852 _mesa_glsl_error(&loc
, state
,
7853 "gl_PerVertex input must be redeclared as "
7857 case ir_var_shader_out
:
7858 if (ir_variable
*earlier_gl_Position
=
7859 state
->symbols
->get_variable("gl_Position")) {
7860 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7861 } else if (ir_variable
*earlier_gl_out
=
7862 state
->symbols
->get_variable("gl_out")) {
7863 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7865 _mesa_glsl_error(&loc
, state
,
7866 "redeclaration of gl_PerVertex output not "
7867 "allowed in the %s shader",
7868 _mesa_shader_stage_to_string(state
->stage
));
7870 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7871 if (this->instance_name
== NULL
||
7872 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7873 _mesa_glsl_error(&loc
, state
,
7874 "gl_PerVertex output must be redeclared as "
7878 if (this->instance_name
!= NULL
) {
7879 _mesa_glsl_error(&loc
, state
,
7880 "gl_PerVertex output may not be redeclared with "
7881 "an instance name");
7886 _mesa_glsl_error(&loc
, state
,
7887 "gl_PerVertex must be declared as an input or an "
7892 if (earlier_per_vertex
== NULL
) {
7893 /* An error has already been reported. Bail out to avoid null
7894 * dereferences later in this function.
7899 /* Copy locations from the old gl_PerVertex interface block. */
7900 for (unsigned i
= 0; i
< num_variables
; i
++) {
7901 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7903 _mesa_glsl_error(&loc
, state
,
7904 "redeclaration of gl_PerVertex must be a subset "
7905 "of the built-in members of gl_PerVertex");
7907 fields
[i
].location
=
7908 earlier_per_vertex
->fields
.structure
[j
].location
;
7910 earlier_per_vertex
->fields
.structure
[j
].offset
;
7911 fields
[i
].interpolation
=
7912 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7913 fields
[i
].centroid
=
7914 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7916 earlier_per_vertex
->fields
.structure
[j
].sample
;
7918 earlier_per_vertex
->fields
.structure
[j
].patch
;
7919 fields
[i
].precision
=
7920 earlier_per_vertex
->fields
.structure
[j
].precision
;
7921 fields
[i
].explicit_xfb_buffer
=
7922 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7923 fields
[i
].xfb_buffer
=
7924 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7925 fields
[i
].xfb_stride
=
7926 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7930 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7933 * If a built-in interface block is redeclared, it must appear in
7934 * the shader before any use of any member included in the built-in
7935 * declaration, or a compilation error will result.
7937 * This appears to be a clarification to the behaviour established for
7938 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7939 * regardless of GLSL version.
7941 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7942 v
.run(instructions
);
7943 if (v
.usage_found()) {
7944 _mesa_glsl_error(&loc
, state
,
7945 "redeclaration of a built-in interface block must "
7946 "appear before any use of any member of the "
7951 const glsl_type
*block_type
=
7952 glsl_type::get_interface_instance(fields
,
7956 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7959 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7961 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7962 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7965 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7966 YYLTYPE loc
= this->get_location();
7967 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7968 "already taken in the current scope",
7969 this->block_name
, iface_type_name
);
7972 /* Since interface blocks cannot contain statements, it should be
7973 * impossible for the block to generate any instructions.
7975 assert(declared_variables
.is_empty());
7977 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7979 * Geometry shader input variables get the per-vertex values written
7980 * out by vertex shader output variables of the same names. Since a
7981 * geometry shader operates on a set of vertices, each input varying
7982 * variable (or input block, see interface blocks below) needs to be
7983 * declared as an array.
7985 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7986 var_mode
== ir_var_shader_in
) {
7987 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7988 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7989 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7990 !this->layout
.flags
.q
.patch
&&
7991 this->array_specifier
== NULL
&&
7992 var_mode
== ir_var_shader_in
) {
7993 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7994 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7995 !this->layout
.flags
.q
.patch
&&
7996 this->array_specifier
== NULL
&&
7997 var_mode
== ir_var_shader_out
) {
7998 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
8002 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
8005 * "If an instance name (instance-name) is used, then it puts all the
8006 * members inside a scope within its own name space, accessed with the
8007 * field selector ( . ) operator (analogously to structures)."
8009 if (this->instance_name
) {
8010 if (redeclaring_per_vertex
) {
8011 /* When a built-in in an unnamed interface block is redeclared,
8012 * get_variable_being_redeclared() calls
8013 * check_builtin_array_max_size() to make sure that built-in array
8014 * variables aren't redeclared to illegal sizes. But we're looking
8015 * at a redeclaration of a named built-in interface block. So we
8016 * have to manually call check_builtin_array_max_size() for all parts
8017 * of the interface that are arrays.
8019 for (unsigned i
= 0; i
< num_variables
; i
++) {
8020 if (fields
[i
].type
->is_array()) {
8021 const unsigned size
= fields
[i
].type
->array_size();
8022 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
8026 validate_identifier(this->instance_name
, loc
, state
);
8031 if (this->array_specifier
!= NULL
) {
8032 const glsl_type
*block_array_type
=
8033 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
8035 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
8037 * For uniform blocks declared an array, each individual array
8038 * element corresponds to a separate buffer object backing one
8039 * instance of the block. As the array size indicates the number
8040 * of buffer objects needed, uniform block array declarations
8041 * must specify an array size.
8043 * And a few paragraphs later:
8045 * Geometry shader input blocks must be declared as arrays and
8046 * follow the array declaration and linking rules for all
8047 * geometry shader inputs. All other input and output block
8048 * arrays must specify an array size.
8050 * The same applies to tessellation shaders.
8052 * The upshot of this is that the only circumstance where an
8053 * interface array size *doesn't* need to be specified is on a
8054 * geometry shader input, tessellation control shader input,
8055 * tessellation control shader output, and tessellation evaluation
8058 if (block_array_type
->is_unsized_array()) {
8059 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
8060 state
->stage
== MESA_SHADER_TESS_CTRL
||
8061 state
->stage
== MESA_SHADER_TESS_EVAL
;
8062 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
8064 if (this->layout
.flags
.q
.in
) {
8066 _mesa_glsl_error(&loc
, state
,
8067 "unsized input block arrays not allowed in "
8069 _mesa_shader_stage_to_string(state
->stage
));
8070 } else if (this->layout
.flags
.q
.out
) {
8072 _mesa_glsl_error(&loc
, state
,
8073 "unsized output block arrays not allowed in "
8075 _mesa_shader_stage_to_string(state
->stage
));
8077 /* by elimination, this is a uniform block array */
8078 _mesa_glsl_error(&loc
, state
,
8079 "unsized uniform block arrays not allowed in "
8081 _mesa_shader_stage_to_string(state
->stage
));
8085 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
8087 * * Arrays of arrays of blocks are not allowed
8089 if (state
->es_shader
&& block_array_type
->is_array() &&
8090 block_array_type
->fields
.array
->is_array()) {
8091 _mesa_glsl_error(&loc
, state
,
8092 "arrays of arrays interface blocks are "
8096 var
= new(state
) ir_variable(block_array_type
,
8097 this->instance_name
,
8100 var
= new(state
) ir_variable(block_type
,
8101 this->instance_name
,
8105 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8106 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8108 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8109 var
->data
.read_only
= true;
8111 var
->data
.patch
= this->layout
.flags
.q
.patch
;
8113 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
8114 handle_geometry_shader_input_decl(state
, loc
, var
);
8115 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8116 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
8117 handle_tess_shader_input_decl(state
, loc
, var
);
8118 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
8119 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
8121 for (unsigned i
= 0; i
< num_variables
; i
++) {
8122 if (var
->data
.mode
== ir_var_shader_storage
)
8123 apply_memory_qualifiers(var
, fields
[i
]);
8126 if (ir_variable
*earlier
=
8127 state
->symbols
->get_variable(this->instance_name
)) {
8128 if (!redeclaring_per_vertex
) {
8129 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
8130 this->instance_name
);
8132 earlier
->data
.how_declared
= ir_var_declared_normally
;
8133 earlier
->type
= var
->type
;
8134 earlier
->reinit_interface_type(block_type
);
8137 if (this->layout
.flags
.q
.explicit_binding
) {
8138 apply_explicit_binding(state
, &loc
, var
, var
->type
,
8142 var
->data
.stream
= qual_stream
;
8143 if (layout
.flags
.q
.explicit_location
) {
8144 var
->data
.location
= expl_location
;
8145 var
->data
.explicit_location
= true;
8148 state
->symbols
->add_variable(var
);
8149 instructions
->push_tail(var
);
8152 /* In order to have an array size, the block must also be declared with
8155 assert(this->array_specifier
== NULL
);
8157 for (unsigned i
= 0; i
< num_variables
; i
++) {
8159 new(state
) ir_variable(fields
[i
].type
,
8160 ralloc_strdup(state
, fields
[i
].name
),
8162 var
->data
.interpolation
= fields
[i
].interpolation
;
8163 var
->data
.centroid
= fields
[i
].centroid
;
8164 var
->data
.sample
= fields
[i
].sample
;
8165 var
->data
.patch
= fields
[i
].patch
;
8166 var
->data
.stream
= qual_stream
;
8167 var
->data
.location
= fields
[i
].location
;
8169 if (fields
[i
].location
!= -1)
8170 var
->data
.explicit_location
= true;
8172 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
8173 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
8175 if (fields
[i
].offset
!= -1)
8176 var
->data
.explicit_xfb_offset
= true;
8177 var
->data
.offset
= fields
[i
].offset
;
8179 var
->init_interface_type(block_type
);
8181 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8182 var
->data
.read_only
= true;
8184 /* Precision qualifiers do not have any meaning in Desktop GLSL */
8185 if (state
->es_shader
) {
8186 var
->data
.precision
=
8187 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
8191 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
8192 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8193 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8195 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
8198 if (var
->data
.mode
== ir_var_shader_storage
)
8199 apply_memory_qualifiers(var
, fields
[i
]);
8201 /* Examine var name here since var may get deleted in the next call */
8202 bool var_is_gl_id
= is_gl_identifier(var
->name
);
8204 if (redeclaring_per_vertex
) {
8205 bool is_redeclaration
;
8207 get_variable_being_redeclared(&var
, loc
, state
,
8208 true /* allow_all_redeclarations */,
8210 if (!var_is_gl_id
|| !is_redeclaration
) {
8211 _mesa_glsl_error(&loc
, state
,
8212 "redeclaration of gl_PerVertex can only "
8213 "include built-in variables");
8214 } else if (var
->data
.how_declared
== ir_var_declared_normally
) {
8215 _mesa_glsl_error(&loc
, state
,
8216 "`%s' has already been redeclared",
8219 var
->data
.how_declared
= ir_var_declared_in_block
;
8220 var
->reinit_interface_type(block_type
);
8225 if (state
->symbols
->get_variable(var
->name
) != NULL
)
8226 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
8228 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
8229 * The UBO declaration itself doesn't get an ir_variable unless it
8230 * has an instance name. This is ugly.
8232 if (this->layout
.flags
.q
.explicit_binding
) {
8233 apply_explicit_binding(state
, &loc
, var
,
8234 var
->get_interface_type(), &this->layout
);
8237 if (var
->type
->is_unsized_array()) {
8238 if (var
->is_in_shader_storage_block() &&
8239 is_unsized_array_last_element(var
)) {
8240 var
->data
.from_ssbo_unsized_array
= true;
8242 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
8244 * "If an array is declared as the last member of a shader storage
8245 * block and the size is not specified at compile-time, it is
8246 * sized at run-time. In all other cases, arrays are sized only
8249 * In desktop GLSL it is allowed to have unsized-arrays that are
8250 * not last, as long as we can determine that they are implicitly
8253 if (state
->es_shader
) {
8254 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
8255 "definition: only last member of a shader "
8256 "storage block can be defined as unsized "
8257 "array", fields
[i
].name
);
8262 state
->symbols
->add_variable(var
);
8263 instructions
->push_tail(var
);
8266 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
8267 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
8269 * It is also a compilation error ... to redeclare a built-in
8270 * block and then use a member from that built-in block that was
8271 * not included in the redeclaration.
8273 * This appears to be a clarification to the behaviour established
8274 * for gl_PerVertex by GLSL 1.50, therefore we implement this
8275 * behaviour regardless of GLSL version.
8277 * To prevent the shader from using a member that was not included in
8278 * the redeclaration, we disable any ir_variables that are still
8279 * associated with the old declaration of gl_PerVertex (since we've
8280 * already updated all of the variables contained in the new
8281 * gl_PerVertex to point to it).
8283 * As a side effect this will prevent
8284 * validate_intrastage_interface_blocks() from getting confused and
8285 * thinking there are conflicting definitions of gl_PerVertex in the
8288 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8289 ir_variable
*const var
= node
->as_variable();
8291 var
->get_interface_type() == earlier_per_vertex
&&
8292 var
->data
.mode
== var_mode
) {
8293 if (var
->data
.how_declared
== ir_var_declared_normally
) {
8294 _mesa_glsl_error(&loc
, state
,
8295 "redeclaration of gl_PerVertex cannot "
8296 "follow a redeclaration of `%s'",
8299 state
->symbols
->disable_variable(var
->name
);
8311 ast_tcs_output_layout::hir(exec_list
*instructions
,
8312 struct _mesa_glsl_parse_state
*state
)
8314 YYLTYPE loc
= this->get_location();
8316 unsigned num_vertices
;
8317 if (!state
->out_qualifier
->vertices
->
8318 process_qualifier_constant(state
, "vertices", &num_vertices
,
8320 /* return here to stop cascading incorrect error messages */
8324 /* If any shader outputs occurred before this declaration and specified an
8325 * array size, make sure the size they specified is consistent with the
8328 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8329 _mesa_glsl_error(&loc
, state
,
8330 "this tessellation control shader output layout "
8331 "specifies %u vertices, but a previous output "
8332 "is declared with size %u",
8333 num_vertices
, state
->tcs_output_size
);
8337 state
->tcs_output_vertices_specified
= true;
8339 /* If any shader outputs occurred before this declaration and did not
8340 * specify an array size, their size is determined now.
8342 foreach_in_list (ir_instruction
, node
, instructions
) {
8343 ir_variable
*var
= node
->as_variable();
8344 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8347 /* Note: Not all tessellation control shader output are arrays. */
8348 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8351 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8352 _mesa_glsl_error(&loc
, state
,
8353 "this tessellation control shader output layout "
8354 "specifies %u vertices, but an access to element "
8355 "%u of output `%s' already exists", num_vertices
,
8356 var
->data
.max_array_access
, var
->name
);
8358 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8368 ast_gs_input_layout::hir(exec_list
*instructions
,
8369 struct _mesa_glsl_parse_state
*state
)
8371 YYLTYPE loc
= this->get_location();
8373 /* Should have been prevented by the parser. */
8374 assert(!state
->gs_input_prim_type_specified
8375 || state
->in_qualifier
->prim_type
== this->prim_type
);
8377 /* If any shader inputs occurred before this declaration and specified an
8378 * array size, make sure the size they specified is consistent with the
8381 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8382 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8383 _mesa_glsl_error(&loc
, state
,
8384 "this geometry shader input layout implies %u vertices"
8385 " per primitive, but a previous input is declared"
8386 " with size %u", num_vertices
, state
->gs_input_size
);
8390 state
->gs_input_prim_type_specified
= true;
8392 /* If any shader inputs occurred before this declaration and did not
8393 * specify an array size, their size is determined now.
8395 foreach_in_list(ir_instruction
, node
, instructions
) {
8396 ir_variable
*var
= node
->as_variable();
8397 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8400 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8404 if (var
->type
->is_unsized_array()) {
8405 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8406 _mesa_glsl_error(&loc
, state
,
8407 "this geometry shader input layout implies %u"
8408 " vertices, but an access to element %u of input"
8409 " `%s' already exists", num_vertices
,
8410 var
->data
.max_array_access
, var
->name
);
8412 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8423 ast_cs_input_layout::hir(exec_list
*instructions
,
8424 struct _mesa_glsl_parse_state
*state
)
8426 YYLTYPE loc
= this->get_location();
8428 /* From the ARB_compute_shader specification:
8430 * If the local size of the shader in any dimension is greater
8431 * than the maximum size supported by the implementation for that
8432 * dimension, a compile-time error results.
8434 * It is not clear from the spec how the error should be reported if
8435 * the total size of the work group exceeds
8436 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8437 * report it at compile time as well.
8439 GLuint64 total_invocations
= 1;
8440 unsigned qual_local_size
[3];
8441 for (int i
= 0; i
< 3; i
++) {
8443 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8445 /* Infer a local_size of 1 for unspecified dimensions */
8446 if (this->local_size
[i
] == NULL
) {
8447 qual_local_size
[i
] = 1;
8448 } else if (!this->local_size
[i
]->
8449 process_qualifier_constant(state
, local_size_str
,
8450 &qual_local_size
[i
], false)) {
8451 ralloc_free(local_size_str
);
8454 ralloc_free(local_size_str
);
8456 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8457 _mesa_glsl_error(&loc
, state
,
8458 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8460 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8463 total_invocations
*= qual_local_size
[i
];
8464 if (total_invocations
>
8465 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8466 _mesa_glsl_error(&loc
, state
,
8467 "product of local_sizes exceeds "
8468 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8469 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8474 /* If any compute input layout declaration preceded this one, make sure it
8475 * was consistent with this one.
8477 if (state
->cs_input_local_size_specified
) {
8478 for (int i
= 0; i
< 3; i
++) {
8479 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8480 _mesa_glsl_error(&loc
, state
,
8481 "compute shader input layout does not match"
8482 " previous declaration");
8488 /* The ARB_compute_variable_group_size spec says:
8490 * If a compute shader including a *local_size_variable* qualifier also
8491 * declares a fixed local group size using the *local_size_x*,
8492 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8495 if (state
->cs_input_local_size_variable_specified
) {
8496 _mesa_glsl_error(&loc
, state
,
8497 "compute shader can't include both a variable and a "
8498 "fixed local group size");
8502 state
->cs_input_local_size_specified
= true;
8503 for (int i
= 0; i
< 3; i
++)
8504 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8506 /* We may now declare the built-in constant gl_WorkGroupSize (see
8507 * builtin_variable_generator::generate_constants() for why we didn't
8508 * declare it earlier).
8510 ir_variable
*var
= new(state
->symbols
)
8511 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8512 var
->data
.how_declared
= ir_var_declared_implicitly
;
8513 var
->data
.read_only
= true;
8514 instructions
->push_tail(var
);
8515 state
->symbols
->add_variable(var
);
8516 ir_constant_data data
;
8517 memset(&data
, 0, sizeof(data
));
8518 for (int i
= 0; i
< 3; i
++)
8519 data
.u
[i
] = qual_local_size
[i
];
8520 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8521 var
->constant_initializer
=
8522 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8523 var
->data
.has_initializer
= true;
8530 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8531 exec_list
*instructions
)
8533 bool gl_FragColor_assigned
= false;
8534 bool gl_FragData_assigned
= false;
8535 bool gl_FragSecondaryColor_assigned
= false;
8536 bool gl_FragSecondaryData_assigned
= false;
8537 bool user_defined_fs_output_assigned
= false;
8538 ir_variable
*user_defined_fs_output
= NULL
;
8540 /* It would be nice to have proper location information. */
8542 memset(&loc
, 0, sizeof(loc
));
8544 foreach_in_list(ir_instruction
, node
, instructions
) {
8545 ir_variable
*var
= node
->as_variable();
8547 if (!var
|| !var
->data
.assigned
)
8550 if (strcmp(var
->name
, "gl_FragColor") == 0)
8551 gl_FragColor_assigned
= true;
8552 else if (strcmp(var
->name
, "gl_FragData") == 0)
8553 gl_FragData_assigned
= true;
8554 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8555 gl_FragSecondaryColor_assigned
= true;
8556 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8557 gl_FragSecondaryData_assigned
= true;
8558 else if (!is_gl_identifier(var
->name
)) {
8559 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8560 var
->data
.mode
== ir_var_shader_out
) {
8561 user_defined_fs_output_assigned
= true;
8562 user_defined_fs_output
= var
;
8567 /* From the GLSL 1.30 spec:
8569 * "If a shader statically assigns a value to gl_FragColor, it
8570 * may not assign a value to any element of gl_FragData. If a
8571 * shader statically writes a value to any element of
8572 * gl_FragData, it may not assign a value to
8573 * gl_FragColor. That is, a shader may assign values to either
8574 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8575 * linked together must also consistently write just one of
8576 * these variables. Similarly, if user declared output
8577 * variables are in use (statically assigned to), then the
8578 * built-in variables gl_FragColor and gl_FragData may not be
8579 * assigned to. These incorrect usages all generate compile
8582 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8583 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8584 "`gl_FragColor' and `gl_FragData'");
8585 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8586 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8587 "`gl_FragColor' and `%s'",
8588 user_defined_fs_output
->name
);
8589 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8590 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8591 "`gl_FragSecondaryColorEXT' and"
8592 " `gl_FragSecondaryDataEXT'");
8593 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8594 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8595 "`gl_FragColor' and"
8596 " `gl_FragSecondaryDataEXT'");
8597 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8598 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8600 " `gl_FragSecondaryColorEXT'");
8601 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8602 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8603 "`gl_FragData' and `%s'",
8604 user_defined_fs_output
->name
);
8607 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8608 !state
->EXT_blend_func_extended_enable
) {
8609 _mesa_glsl_error(&loc
, state
,
8610 "Dual source blending requires EXT_blend_func_extended");
8616 remove_per_vertex_blocks(exec_list
*instructions
,
8617 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8619 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8620 * if it exists in this shader type.
8622 const glsl_type
*per_vertex
= NULL
;
8624 case ir_var_shader_in
:
8625 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8626 per_vertex
= gl_in
->get_interface_type();
8628 case ir_var_shader_out
:
8629 if (ir_variable
*gl_Position
=
8630 state
->symbols
->get_variable("gl_Position")) {
8631 per_vertex
= gl_Position
->get_interface_type();
8635 assert(!"Unexpected mode");
8639 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8640 * need to do anything.
8642 if (per_vertex
== NULL
)
8645 /* If the interface block is used by the shader, then we don't need to do
8648 interface_block_usage_visitor
v(mode
, per_vertex
);
8649 v
.run(instructions
);
8650 if (v
.usage_found())
8653 /* Remove any ir_variable declarations that refer to the interface block
8656 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8657 ir_variable
*const var
= node
->as_variable();
8658 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8659 var
->data
.mode
== mode
) {
8660 state
->symbols
->disable_variable(var
->name
);