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 var
->data
.fb_fetch_output
= state
->stage
== MESA_SHADER_FRAGMENT
&&
3998 qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
4000 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
4001 /* User-defined ins/outs are not permitted in compute shaders. */
4002 if (state
->stage
== MESA_SHADER_COMPUTE
) {
4003 _mesa_glsl_error(loc
, state
,
4004 "user-defined input and output variables are not "
4005 "permitted in compute shaders");
4008 /* This variable is being used to link data between shader stages (in
4009 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
4010 * that is allowed for such purposes.
4012 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
4014 * "The varying qualifier can be used only with the data types
4015 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
4018 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
4019 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
4021 * "Fragment inputs can only be signed and unsigned integers and
4022 * integer vectors, float, floating-point vectors, matrices, or
4023 * arrays of these. Structures cannot be input.
4025 * Similar text exists in the section on vertex shader outputs.
4027 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
4028 * 3.00 spec allows structs as well. Varying structs are also allowed
4031 * From section 4.3.4 of the ARB_bindless_texture spec:
4033 * "(modify third paragraph of the section to allow sampler and image
4034 * types) ... Vertex shader inputs can only be float,
4035 * single-precision floating-point scalars, single-precision
4036 * floating-point vectors, matrices, signed and unsigned integers
4037 * and integer vectors, sampler and image types."
4039 * From section 4.3.6 of the ARB_bindless_texture spec:
4041 * "Output variables can only be floating-point scalars,
4042 * floating-point vectors, matrices, signed or unsigned integers or
4043 * integer vectors, sampler or image types, or arrays or structures
4046 switch (var
->type
->without_array()->base_type
) {
4047 case GLSL_TYPE_FLOAT
:
4048 /* Ok in all GLSL versions */
4050 case GLSL_TYPE_UINT
:
4052 if (state
->is_version(130, 300))
4054 _mesa_glsl_error(loc
, state
,
4055 "varying variables must be of base type float in %s",
4056 state
->get_version_string());
4058 case GLSL_TYPE_STRUCT
:
4059 if (state
->is_version(150, 300))
4061 _mesa_glsl_error(loc
, state
,
4062 "varying variables may not be of type struct");
4064 case GLSL_TYPE_DOUBLE
:
4065 case GLSL_TYPE_UINT64
:
4066 case GLSL_TYPE_INT64
:
4068 case GLSL_TYPE_SAMPLER
:
4069 case GLSL_TYPE_IMAGE
:
4070 if (state
->has_bindless())
4074 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
4079 if (state
->all_invariant
&& var
->data
.mode
== ir_var_shader_out
)
4080 var
->data
.invariant
= true;
4082 var
->data
.interpolation
=
4083 interpret_interpolation_qualifier(qual
, var
->type
,
4084 (ir_variable_mode
) var
->data
.mode
,
4087 /* Does the declaration use the deprecated 'attribute' or 'varying'
4090 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
4091 || qual
->flags
.q
.varying
;
4094 /* Validate auxiliary storage qualifiers */
4096 /* From section 4.3.4 of the GLSL 1.30 spec:
4097 * "It is an error to use centroid in in a vertex shader."
4099 * From section 4.3.4 of the GLSL ES 3.00 spec:
4100 * "It is an error to use centroid in or interpolation qualifiers in
4101 * a vertex shader input."
4104 /* Section 4.3.6 of the GLSL 1.30 specification states:
4105 * "It is an error to use centroid out in a fragment shader."
4107 * The GL_ARB_shading_language_420pack extension specification states:
4108 * "It is an error to use auxiliary storage qualifiers or interpolation
4109 * qualifiers on an output in a fragment shader."
4111 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
4112 _mesa_glsl_error(loc
, state
,
4113 "sample qualifier may only be used on `in` or `out` "
4114 "variables between shader stages");
4116 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
4117 _mesa_glsl_error(loc
, state
,
4118 "centroid qualifier may only be used with `in', "
4119 "`out' or `varying' variables between shader stages");
4122 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
4123 _mesa_glsl_error(loc
, state
,
4124 "the shared storage qualifiers can only be used with "
4128 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
4132 * Get the variable that is being redeclared by this declaration or if it
4133 * does not exist, the current declared variable.
4135 * Semantic checks to verify the validity of the redeclaration are also
4136 * performed. If semantic checks fail, compilation error will be emitted via
4137 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
4140 * A pointer to an existing variable in the current scope if the declaration
4141 * is a redeclaration, current variable otherwise. \c is_declared boolean
4142 * will return \c true if the declaration is a redeclaration, \c false
4145 static ir_variable
*
4146 get_variable_being_redeclared(ir_variable
**var_ptr
, YYLTYPE loc
,
4147 struct _mesa_glsl_parse_state
*state
,
4148 bool allow_all_redeclarations
,
4149 bool *is_redeclaration
)
4151 ir_variable
*var
= *var_ptr
;
4153 /* Check if this declaration is actually a re-declaration, either to
4154 * resize an array or add qualifiers to an existing variable.
4156 * This is allowed for variables in the current scope, or when at
4157 * global scope (for built-ins in the implicit outer scope).
4159 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
4160 if (earlier
== NULL
||
4161 (state
->current_function
!= NULL
&&
4162 !state
->symbols
->name_declared_this_scope(var
->name
))) {
4163 *is_redeclaration
= false;
4167 *is_redeclaration
= true;
4169 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4171 * "It is legal to declare an array without a size and then
4172 * later re-declare the same name as an array of the same
4173 * type and specify a size."
4175 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4176 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4177 /* FINISHME: This doesn't match the qualifiers on the two
4178 * FINISHME: declarations. It's not 100% clear whether this is
4179 * FINISHME: required or not.
4182 const int size
= var
->type
->array_size();
4183 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4184 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4185 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4187 earlier
->data
.max_array_access
);
4190 earlier
->type
= var
->type
;
4194 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4195 state
->is_version(150, 0))
4196 && strcmp(var
->name
, "gl_FragCoord") == 0
4197 && earlier
->type
== var
->type
4198 && var
->data
.mode
== ir_var_shader_in
) {
4199 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4202 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
4203 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
4205 /* According to section 4.3.7 of the GLSL 1.30 spec,
4206 * the following built-in varaibles can be redeclared with an
4207 * interpolation qualifier:
4210 * * gl_FrontSecondaryColor
4211 * * gl_BackSecondaryColor
4213 * * gl_SecondaryColor
4215 } else if (state
->is_version(130, 0)
4216 && (strcmp(var
->name
, "gl_FrontColor") == 0
4217 || strcmp(var
->name
, "gl_BackColor") == 0
4218 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4219 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4220 || strcmp(var
->name
, "gl_Color") == 0
4221 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
4222 && earlier
->type
== var
->type
4223 && earlier
->data
.mode
== var
->data
.mode
) {
4224 earlier
->data
.interpolation
= var
->data
.interpolation
;
4226 /* Layout qualifiers for gl_FragDepth. */
4227 } else if ((state
->is_version(420, 0) ||
4228 state
->AMD_conservative_depth_enable
||
4229 state
->ARB_conservative_depth_enable
)
4230 && strcmp(var
->name
, "gl_FragDepth") == 0
4231 && earlier
->type
== var
->type
4232 && earlier
->data
.mode
== var
->data
.mode
) {
4234 /** From the AMD_conservative_depth spec:
4235 * Within any shader, the first redeclarations of gl_FragDepth
4236 * must appear before any use of gl_FragDepth.
4238 if (earlier
->data
.used
) {
4239 _mesa_glsl_error(&loc
, state
,
4240 "the first redeclaration of gl_FragDepth "
4241 "must appear before any use of gl_FragDepth");
4244 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4245 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4246 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4247 _mesa_glsl_error(&loc
, state
,
4248 "gl_FragDepth: depth layout is declared here "
4249 "as '%s, but it was previously declared as "
4251 depth_layout_string(var
->data
.depth_layout
),
4252 depth_layout_string(earlier
->data
.depth_layout
));
4255 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4257 } else if (state
->has_framebuffer_fetch() &&
4258 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4259 var
->type
== earlier
->type
&&
4260 var
->data
.mode
== ir_var_auto
) {
4261 /* According to the EXT_shader_framebuffer_fetch spec:
4263 * "By default, gl_LastFragData is declared with the mediump precision
4264 * qualifier. This can be changed by redeclaring the corresponding
4265 * variables with the desired precision qualifier."
4267 earlier
->data
.precision
= var
->data
.precision
;
4269 } else if (earlier
->data
.how_declared
== ir_var_declared_implicitly
&&
4270 state
->allow_builtin_variable_redeclaration
) {
4271 /* Allow verbatim redeclarations of built-in variables. Not explicitly
4272 * valid, but some applications do it.
4274 if (earlier
->data
.mode
!= var
->data
.mode
&&
4275 !(earlier
->data
.mode
== ir_var_system_value
&&
4276 var
->data
.mode
== ir_var_shader_in
)) {
4277 _mesa_glsl_error(&loc
, state
,
4278 "redeclaration of `%s' with incorrect qualifiers",
4280 } else if (earlier
->type
!= var
->type
) {
4281 _mesa_glsl_error(&loc
, state
,
4282 "redeclaration of `%s' has incorrect type",
4285 } else if (allow_all_redeclarations
) {
4286 if (earlier
->data
.mode
!= var
->data
.mode
) {
4287 _mesa_glsl_error(&loc
, state
,
4288 "redeclaration of `%s' with incorrect qualifiers",
4290 } else if (earlier
->type
!= var
->type
) {
4291 _mesa_glsl_error(&loc
, state
,
4292 "redeclaration of `%s' has incorrect type",
4296 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4303 * Generate the IR for an initializer in a variable declaration
4306 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4307 ast_fully_specified_type
*type
,
4308 exec_list
*initializer_instructions
,
4309 struct _mesa_glsl_parse_state
*state
)
4311 void *mem_ctx
= state
;
4312 ir_rvalue
*result
= NULL
;
4314 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4316 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4318 * "All uniform variables are read-only and are initialized either
4319 * directly by an application via API commands, or indirectly by
4322 if (var
->data
.mode
== ir_var_uniform
) {
4323 state
->check_version(120, 0, &initializer_loc
,
4324 "cannot initialize uniform %s",
4328 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4330 * "Buffer variables cannot have initializers."
4332 if (var
->data
.mode
== ir_var_shader_storage
) {
4333 _mesa_glsl_error(&initializer_loc
, state
,
4334 "cannot initialize buffer variable %s",
4338 /* From section 4.1.7 of the GLSL 4.40 spec:
4340 * "Opaque variables [...] are initialized only through the
4341 * OpenGL API; they cannot be declared with an initializer in a
4344 * From section 4.1.7 of the ARB_bindless_texture spec:
4346 * "Samplers may be declared as shader inputs and outputs, as uniform
4347 * variables, as temporary variables, and as function parameters."
4349 * From section 4.1.X of the ARB_bindless_texture spec:
4351 * "Images may be declared as shader inputs and outputs, as uniform
4352 * variables, as temporary variables, and as function parameters."
4354 if (var
->type
->contains_atomic() ||
4355 (!state
->has_bindless() && var
->type
->contains_opaque())) {
4356 _mesa_glsl_error(&initializer_loc
, state
,
4357 "cannot initialize %s variable %s",
4358 var
->name
, state
->has_bindless() ? "atomic" : "opaque");
4361 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4362 _mesa_glsl_error(&initializer_loc
, state
,
4363 "cannot initialize %s shader input / %s %s",
4364 _mesa_shader_stage_to_string(state
->stage
),
4365 (state
->stage
== MESA_SHADER_VERTEX
)
4366 ? "attribute" : "varying",
4370 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4371 _mesa_glsl_error(&initializer_loc
, state
,
4372 "cannot initialize %s shader output %s",
4373 _mesa_shader_stage_to_string(state
->stage
),
4377 /* If the initializer is an ast_aggregate_initializer, recursively store
4378 * type information from the LHS into it, so that its hir() function can do
4381 if (decl
->initializer
->oper
== ast_aggregate
)
4382 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4384 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4385 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4387 /* Calculate the constant value if this is a const or uniform
4390 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4392 * "Declarations of globals without a storage qualifier, or with
4393 * just the const qualifier, may include initializers, in which case
4394 * they will be initialized before the first line of main() is
4395 * executed. Such initializers must be a constant expression."
4397 * The same section of the GLSL ES 3.00.4 spec has similar language.
4399 if (type
->qualifier
.flags
.q
.constant
4400 || type
->qualifier
.flags
.q
.uniform
4401 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4402 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4404 if (new_rhs
!= NULL
) {
4407 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4410 * "A constant expression is one of
4414 * - an expression formed by an operator on operands that are
4415 * all constant expressions, including getting an element of
4416 * a constant array, or a field of a constant structure, or
4417 * components of a constant vector. However, the sequence
4418 * operator ( , ) and the assignment operators ( =, +=, ...)
4419 * are not included in the operators that can create a
4420 * constant expression."
4422 * Section 12.43 (Sequence operator and constant expressions) says:
4424 * "Should the following construct be allowed?
4428 * The expression within the brackets uses the sequence operator
4429 * (',') and returns the integer 3 so the construct is declaring
4430 * a single-dimensional array of size 3. In some languages, the
4431 * construct declares a two-dimensional array. It would be
4432 * preferable to make this construct illegal to avoid confusion.
4434 * One possibility is to change the definition of the sequence
4435 * operator so that it does not return a constant-expression and
4436 * hence cannot be used to declare an array size.
4438 * RESOLUTION: The result of a sequence operator is not a
4439 * constant-expression."
4441 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4442 * contains language almost identical to the section 4.3.3 in the
4443 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4446 ir_constant
*constant_value
=
4447 rhs
->constant_expression_value(mem_ctx
);
4449 if (!constant_value
||
4450 (state
->is_version(430, 300) &&
4451 decl
->initializer
->has_sequence_subexpression())) {
4452 const char *const variable_mode
=
4453 (type
->qualifier
.flags
.q
.constant
)
4455 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4457 /* If ARB_shading_language_420pack is enabled, initializers of
4458 * const-qualified local variables do not have to be constant
4459 * expressions. Const-qualified global variables must still be
4460 * initialized with constant expressions.
4462 if (!state
->has_420pack()
4463 || state
->current_function
== NULL
) {
4464 _mesa_glsl_error(& initializer_loc
, state
,
4465 "initializer of %s variable `%s' must be a "
4466 "constant expression",
4469 if (var
->type
->is_numeric()) {
4470 /* Reduce cascading errors. */
4471 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4472 ? ir_constant::zero(state
, var
->type
) : NULL
;
4476 rhs
= constant_value
;
4477 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4478 ? constant_value
: NULL
;
4481 if (var
->type
->is_numeric()) {
4482 /* Reduce cascading errors. */
4483 rhs
= var
->constant_value
= type
->qualifier
.flags
.q
.constant
4484 ? ir_constant::zero(state
, var
->type
) : NULL
;
4489 if (rhs
&& !rhs
->type
->is_error()) {
4490 bool temp
= var
->data
.read_only
;
4491 if (type
->qualifier
.flags
.q
.constant
)
4492 var
->data
.read_only
= false;
4494 /* Never emit code to initialize a uniform.
4496 const glsl_type
*initializer_type
;
4497 if (!type
->qualifier
.flags
.q
.uniform
) {
4498 do_assignment(initializer_instructions
, state
,
4503 type
->get_location());
4504 initializer_type
= result
->type
;
4506 initializer_type
= rhs
->type
;
4508 var
->constant_initializer
= rhs
->constant_expression_value(mem_ctx
);
4509 var
->data
.has_initializer
= true;
4511 /* If the declared variable is an unsized array, it must inherrit
4512 * its full type from the initializer. A declaration such as
4514 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4518 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4520 * The assignment generated in the if-statement (below) will also
4521 * automatically handle this case for non-uniforms.
4523 * If the declared variable is not an array, the types must
4524 * already match exactly. As a result, the type assignment
4525 * here can be done unconditionally. For non-uniforms the call
4526 * to do_assignment can change the type of the initializer (via
4527 * the implicit conversion rules). For uniforms the initializer
4528 * must be a constant expression, and the type of that expression
4529 * was validated above.
4531 var
->type
= initializer_type
;
4533 var
->data
.read_only
= temp
;
4540 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4541 YYLTYPE loc
, ir_variable
*var
,
4542 unsigned num_vertices
,
4544 const char *var_category
)
4546 if (var
->type
->is_unsized_array()) {
4547 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4549 * All geometry shader input unsized array declarations will be
4550 * sized by an earlier input layout qualifier, when present, as per
4551 * the following table.
4553 * Followed by a table mapping each allowed input layout qualifier to
4554 * the corresponding input length.
4556 * Similarly for tessellation control shader outputs.
4558 if (num_vertices
!= 0)
4559 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4562 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4563 * includes the following examples of compile-time errors:
4565 * // code sequence within one shader...
4566 * in vec4 Color1[]; // size unknown
4567 * ...Color1.length()...// illegal, length() unknown
4568 * in vec4 Color2[2]; // size is 2
4569 * ...Color1.length()...// illegal, Color1 still has no size
4570 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4571 * layout(lines) in; // legal, input size is 2, matching
4572 * in vec4 Color4[3]; // illegal, contradicts layout
4575 * To detect the case illustrated by Color3, we verify that the size of
4576 * an explicitly-sized array matches the size of any previously declared
4577 * explicitly-sized array. To detect the case illustrated by Color4, we
4578 * verify that the size of an explicitly-sized array is consistent with
4579 * any previously declared input layout.
4581 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4582 _mesa_glsl_error(&loc
, state
,
4583 "%s size contradicts previously declared layout "
4584 "(size is %u, but layout requires a size of %u)",
4585 var_category
, var
->type
->length
, num_vertices
);
4586 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4587 _mesa_glsl_error(&loc
, state
,
4588 "%s sizes are inconsistent (size is %u, but a "
4589 "previous declaration has size %u)",
4590 var_category
, var
->type
->length
, *size
);
4592 *size
= var
->type
->length
;
4598 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4599 YYLTYPE loc
, ir_variable
*var
)
4601 unsigned num_vertices
= 0;
4603 if (state
->tcs_output_vertices_specified
) {
4604 if (!state
->out_qualifier
->vertices
->
4605 process_qualifier_constant(state
, "vertices",
4606 &num_vertices
, false)) {
4610 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4611 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4612 "GL_MAX_PATCH_VERTICES", num_vertices
);
4617 if (!var
->type
->is_array() && !var
->data
.patch
) {
4618 _mesa_glsl_error(&loc
, state
,
4619 "tessellation control shader outputs must be arrays");
4621 /* To avoid cascading failures, short circuit the checks below. */
4625 if (var
->data
.patch
)
4628 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4629 &state
->tcs_output_size
,
4630 "tessellation control shader output");
4634 * Do additional processing necessary for tessellation control/evaluation shader
4635 * input declarations. This covers both interface block arrays and bare input
4639 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4640 YYLTYPE loc
, ir_variable
*var
)
4642 if (!var
->type
->is_array() && !var
->data
.patch
) {
4643 _mesa_glsl_error(&loc
, state
,
4644 "per-vertex tessellation shader inputs must be arrays");
4645 /* Avoid cascading failures. */
4649 if (var
->data
.patch
)
4652 /* The ARB_tessellation_shader spec says:
4654 * "Declaring an array size is optional. If no size is specified, it
4655 * will be taken from the implementation-dependent maximum patch size
4656 * (gl_MaxPatchVertices). If a size is specified, it must match the
4657 * maximum patch size; otherwise, a compile or link error will occur."
4659 * This text appears twice, once for TCS inputs, and again for TES inputs.
4661 if (var
->type
->is_unsized_array()) {
4662 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4663 state
->Const
.MaxPatchVertices
);
4664 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4665 _mesa_glsl_error(&loc
, state
,
4666 "per-vertex tessellation shader input arrays must be "
4667 "sized to gl_MaxPatchVertices (%d).",
4668 state
->Const
.MaxPatchVertices
);
4674 * Do additional processing necessary for geometry shader input declarations
4675 * (this covers both interface blocks arrays and bare input variables).
4678 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4679 YYLTYPE loc
, ir_variable
*var
)
4681 unsigned num_vertices
= 0;
4683 if (state
->gs_input_prim_type_specified
) {
4684 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4687 /* Geometry shader input variables must be arrays. Caller should have
4688 * reported an error for this.
4690 if (!var
->type
->is_array()) {
4691 assert(state
->error
);
4693 /* To avoid cascading failures, short circuit the checks below. */
4697 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4698 &state
->gs_input_size
,
4699 "geometry shader input");
4703 validate_identifier(const char *identifier
, YYLTYPE loc
,
4704 struct _mesa_glsl_parse_state
*state
)
4706 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4708 * "Identifiers starting with "gl_" are reserved for use by
4709 * OpenGL, and may not be declared in a shader as either a
4710 * variable or a function."
4712 if (is_gl_identifier(identifier
)) {
4713 _mesa_glsl_error(&loc
, state
,
4714 "identifier `%s' uses reserved `gl_' prefix",
4716 } else if (strstr(identifier
, "__")) {
4717 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4720 * "In addition, all identifiers containing two
4721 * consecutive underscores (__) are reserved as
4722 * possible future keywords."
4724 * The intention is that names containing __ are reserved for internal
4725 * use by the implementation, and names prefixed with GL_ are reserved
4726 * for use by Khronos. Names simply containing __ are dangerous to use,
4727 * but should be allowed.
4729 * A future version of the GLSL specification will clarify this.
4731 _mesa_glsl_warning(&loc
, state
,
4732 "identifier `%s' uses reserved `__' string",
4738 ast_declarator_list::hir(exec_list
*instructions
,
4739 struct _mesa_glsl_parse_state
*state
)
4742 const struct glsl_type
*decl_type
;
4743 const char *type_name
= NULL
;
4744 ir_rvalue
*result
= NULL
;
4745 YYLTYPE loc
= this->get_location();
4747 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4749 * "To ensure that a particular output variable is invariant, it is
4750 * necessary to use the invariant qualifier. It can either be used to
4751 * qualify a previously declared variable as being invariant
4753 * invariant gl_Position; // make existing gl_Position be invariant"
4755 * In these cases the parser will set the 'invariant' flag in the declarator
4756 * list, and the type will be NULL.
4758 if (this->invariant
) {
4759 assert(this->type
== NULL
);
4761 if (state
->current_function
!= NULL
) {
4762 _mesa_glsl_error(& loc
, state
,
4763 "all uses of `invariant' keyword must be at global "
4767 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4768 assert(decl
->array_specifier
== NULL
);
4769 assert(decl
->initializer
== NULL
);
4771 ir_variable
*const earlier
=
4772 state
->symbols
->get_variable(decl
->identifier
);
4773 if (earlier
== NULL
) {
4774 _mesa_glsl_error(& loc
, state
,
4775 "undeclared variable `%s' cannot be marked "
4776 "invariant", decl
->identifier
);
4777 } else if (!is_allowed_invariant(earlier
, state
)) {
4778 _mesa_glsl_error(&loc
, state
,
4779 "`%s' cannot be marked invariant; interfaces between "
4780 "shader stages only.", decl
->identifier
);
4781 } else if (earlier
->data
.used
) {
4782 _mesa_glsl_error(& loc
, state
,
4783 "variable `%s' may not be redeclared "
4784 "`invariant' after being used",
4787 earlier
->data
.invariant
= true;
4791 /* Invariant redeclarations do not have r-values.
4796 if (this->precise
) {
4797 assert(this->type
== NULL
);
4799 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4800 assert(decl
->array_specifier
== NULL
);
4801 assert(decl
->initializer
== NULL
);
4803 ir_variable
*const earlier
=
4804 state
->symbols
->get_variable(decl
->identifier
);
4805 if (earlier
== NULL
) {
4806 _mesa_glsl_error(& loc
, state
,
4807 "undeclared variable `%s' cannot be marked "
4808 "precise", decl
->identifier
);
4809 } else if (state
->current_function
!= NULL
&&
4810 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4811 /* Note: we have to check if we're in a function, since
4812 * builtins are treated as having come from another scope.
4814 _mesa_glsl_error(& loc
, state
,
4815 "variable `%s' from an outer scope may not be "
4816 "redeclared `precise' in this scope",
4818 } else if (earlier
->data
.used
) {
4819 _mesa_glsl_error(& loc
, state
,
4820 "variable `%s' may not be redeclared "
4821 "`precise' after being used",
4824 earlier
->data
.precise
= true;
4828 /* Precise redeclarations do not have r-values either. */
4832 assert(this->type
!= NULL
);
4833 assert(!this->invariant
);
4834 assert(!this->precise
);
4836 /* The type specifier may contain a structure definition. Process that
4837 * before any of the variable declarations.
4839 (void) this->type
->specifier
->hir(instructions
, state
);
4841 decl_type
= this->type
->glsl_type(& type_name
, state
);
4843 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4844 * "Buffer variables may only be declared inside interface blocks
4845 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4846 * shader storage blocks. It is a compile-time error to declare buffer
4847 * variables at global scope (outside a block)."
4849 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4850 _mesa_glsl_error(&loc
, state
,
4851 "buffer variables cannot be declared outside "
4852 "interface blocks");
4855 /* An offset-qualified atomic counter declaration sets the default
4856 * offset for the next declaration within the same atomic counter
4859 if (decl_type
&& decl_type
->contains_atomic()) {
4860 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4861 type
->qualifier
.flags
.q
.explicit_offset
) {
4862 unsigned qual_binding
;
4863 unsigned qual_offset
;
4864 if (process_qualifier_constant(state
, &loc
, "binding",
4865 type
->qualifier
.binding
,
4867 && process_qualifier_constant(state
, &loc
, "offset",
4868 type
->qualifier
.offset
,
4870 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4874 ast_type_qualifier allowed_atomic_qual_mask
;
4875 allowed_atomic_qual_mask
.flags
.i
= 0;
4876 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4877 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4878 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4880 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4881 "invalid layout qualifier for",
4885 if (this->declarations
.is_empty()) {
4886 /* If there is no structure involved in the program text, there are two
4887 * possible scenarios:
4889 * - The program text contained something like 'vec4;'. This is an
4890 * empty declaration. It is valid but weird. Emit a warning.
4892 * - The program text contained something like 'S;' and 'S' is not the
4893 * name of a known structure type. This is both invalid and weird.
4896 * - The program text contained something like 'mediump float;'
4897 * when the programmer probably meant 'precision mediump
4898 * float;' Emit a warning with a description of what they
4899 * probably meant to do.
4901 * Note that if decl_type is NULL and there is a structure involved,
4902 * there must have been some sort of error with the structure. In this
4903 * case we assume that an error was already generated on this line of
4904 * code for the structure. There is no need to generate an additional,
4907 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4910 if (decl_type
== NULL
) {
4911 _mesa_glsl_error(&loc
, state
,
4912 "invalid type `%s' in empty declaration",
4915 if (decl_type
->is_array()) {
4916 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4919 * "... any declaration that leaves the size undefined is
4920 * disallowed as this would add complexity and there are no
4923 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4924 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4925 "or implicitly defined");
4928 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4930 * "The combinations of types and qualifiers that cause
4931 * compile-time or link-time errors are the same whether or not
4932 * the declaration is empty."
4934 validate_array_dimensions(decl_type
, state
, &loc
);
4937 if (decl_type
->is_atomic_uint()) {
4938 /* Empty atomic counter declarations are allowed and useful
4939 * to set the default offset qualifier.
4942 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4943 if (this->type
->specifier
->structure
!= NULL
) {
4944 _mesa_glsl_error(&loc
, state
,
4945 "precision qualifiers can't be applied "
4948 static const char *const precision_names
[] = {
4955 _mesa_glsl_warning(&loc
, state
,
4956 "empty declaration with precision "
4957 "qualifier, to set the default precision, "
4958 "use `precision %s %s;'",
4959 precision_names
[this->type
->
4960 qualifier
.precision
],
4963 } else if (this->type
->specifier
->structure
== NULL
) {
4964 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4969 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4970 const struct glsl_type
*var_type
;
4972 const char *identifier
= decl
->identifier
;
4973 /* FINISHME: Emit a warning if a variable declaration shadows a
4974 * FINISHME: declaration at a higher scope.
4977 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4978 if (type_name
!= NULL
) {
4979 _mesa_glsl_error(& loc
, state
,
4980 "invalid type `%s' in declaration of `%s'",
4981 type_name
, decl
->identifier
);
4983 _mesa_glsl_error(& loc
, state
,
4984 "invalid type in declaration of `%s'",
4990 if (this->type
->qualifier
.is_subroutine_decl()) {
4994 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4996 _mesa_glsl_error(& loc
, state
,
4997 "invalid type in declaration of `%s'",
4999 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
5004 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
5007 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
5009 /* The 'varying in' and 'varying out' qualifiers can only be used with
5010 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
5013 if (this->type
->qualifier
.flags
.q
.varying
) {
5014 if (this->type
->qualifier
.flags
.q
.in
) {
5015 _mesa_glsl_error(& loc
, state
,
5016 "`varying in' qualifier in declaration of "
5017 "`%s' only valid for geometry shaders using "
5018 "ARB_geometry_shader4 or EXT_geometry_shader4",
5020 } else if (this->type
->qualifier
.flags
.q
.out
) {
5021 _mesa_glsl_error(& loc
, state
,
5022 "`varying out' qualifier in declaration of "
5023 "`%s' only valid for geometry shaders using "
5024 "ARB_geometry_shader4 or EXT_geometry_shader4",
5029 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
5031 * "Global variables can only use the qualifiers const,
5032 * attribute, uniform, or varying. Only one may be
5035 * Local variables can only use the qualifier const."
5037 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
5038 * any extension that adds the 'layout' keyword.
5040 if (!state
->is_version(130, 300)
5041 && !state
->has_explicit_attrib_location()
5042 && !state
->has_separate_shader_objects()
5043 && !state
->ARB_fragment_coord_conventions_enable
) {
5044 if (this->type
->qualifier
.flags
.q
.out
) {
5045 _mesa_glsl_error(& loc
, state
,
5046 "`out' qualifier in declaration of `%s' "
5047 "only valid for function parameters in %s",
5048 decl
->identifier
, state
->get_version_string());
5050 if (this->type
->qualifier
.flags
.q
.in
) {
5051 _mesa_glsl_error(& loc
, state
,
5052 "`in' qualifier in declaration of `%s' "
5053 "only valid for function parameters in %s",
5054 decl
->identifier
, state
->get_version_string());
5056 /* FINISHME: Test for other invalid qualifiers. */
5059 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
5061 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
5064 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
5065 && (var
->type
->is_numeric() || var
->type
->is_boolean())
5066 && state
->zero_init
) {
5067 const ir_constant_data data
= { { 0 } };
5068 var
->data
.has_initializer
= true;
5069 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
5072 if (this->type
->qualifier
.flags
.q
.invariant
) {
5073 if (!is_allowed_invariant(var
, state
)) {
5074 _mesa_glsl_error(&loc
, state
,
5075 "`%s' cannot be marked invariant; interfaces between "
5076 "shader stages only", var
->name
);
5080 if (state
->current_function
!= NULL
) {
5081 const char *mode
= NULL
;
5082 const char *extra
= "";
5084 /* There is no need to check for 'inout' here because the parser will
5085 * only allow that in function parameter lists.
5087 if (this->type
->qualifier
.flags
.q
.attribute
) {
5089 } else if (this->type
->qualifier
.is_subroutine_decl()) {
5090 mode
= "subroutine uniform";
5091 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
5093 } else if (this->type
->qualifier
.flags
.q
.varying
) {
5095 } else if (this->type
->qualifier
.flags
.q
.in
) {
5097 extra
= " or in function parameter list";
5098 } else if (this->type
->qualifier
.flags
.q
.out
) {
5100 extra
= " or in function parameter list";
5104 _mesa_glsl_error(& loc
, state
,
5105 "%s variable `%s' must be declared at "
5107 mode
, var
->name
, extra
);
5109 } else if (var
->data
.mode
== ir_var_shader_in
) {
5110 var
->data
.read_only
= true;
5112 if (state
->stage
== MESA_SHADER_VERTEX
) {
5113 bool error_emitted
= false;
5115 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
5117 * "Vertex shader inputs can only be float, floating-point
5118 * vectors, matrices, signed and unsigned integers and integer
5119 * vectors. Vertex shader inputs can also form arrays of these
5120 * types, but not structures."
5122 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
5124 * "Vertex shader inputs can only be float, floating-point
5125 * vectors, matrices, signed and unsigned integers and integer
5126 * vectors. They cannot be arrays or structures."
5128 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
5130 * "The attribute qualifier can be used only with float,
5131 * floating-point vectors, and matrices. Attribute variables
5132 * cannot be declared as arrays or structures."
5134 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
5136 * "Vertex shader inputs can only be float, floating-point
5137 * vectors, matrices, signed and unsigned integers and integer
5138 * vectors. Vertex shader inputs cannot be arrays or
5141 * From section 4.3.4 of the ARB_bindless_texture spec:
5143 * "(modify third paragraph of the section to allow sampler and
5144 * image types) ... Vertex shader inputs can only be float,
5145 * single-precision floating-point scalars, single-precision
5146 * floating-point vectors, matrices, signed and unsigned
5147 * integers and integer vectors, sampler and image types."
5149 const glsl_type
*check_type
= var
->type
->without_array();
5151 switch (check_type
->base_type
) {
5152 case GLSL_TYPE_FLOAT
:
5154 case GLSL_TYPE_UINT64
:
5155 case GLSL_TYPE_INT64
:
5157 case GLSL_TYPE_UINT
:
5159 if (state
->is_version(120, 300))
5161 case GLSL_TYPE_DOUBLE
:
5162 if (check_type
->is_double() && (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
5164 case GLSL_TYPE_SAMPLER
:
5165 if (check_type
->is_sampler() && state
->has_bindless())
5167 case GLSL_TYPE_IMAGE
:
5168 if (check_type
->is_image() && state
->has_bindless())
5172 _mesa_glsl_error(& loc
, state
,
5173 "vertex shader input / attribute cannot have "
5175 var
->type
->is_array() ? "array of " : "",
5177 error_emitted
= true;
5180 if (!error_emitted
&& var
->type
->is_array() &&
5181 !state
->check_version(150, 0, &loc
,
5182 "vertex shader input / attribute "
5183 "cannot have array type")) {
5184 error_emitted
= true;
5186 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
5187 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5189 * Geometry shader input variables get the per-vertex values
5190 * written out by vertex shader output variables of the same
5191 * names. Since a geometry shader operates on a set of
5192 * vertices, each input varying variable (or input block, see
5193 * interface blocks below) needs to be declared as an array.
5195 if (!var
->type
->is_array()) {
5196 _mesa_glsl_error(&loc
, state
,
5197 "geometry shader inputs must be arrays");
5200 handle_geometry_shader_input_decl(state
, loc
, var
);
5201 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5202 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5204 * It is a compile-time error to declare a fragment shader
5205 * input with, or that contains, any of the following types:
5209 * * An array of arrays
5210 * * An array of structures
5211 * * A structure containing an array
5212 * * A structure containing a structure
5214 if (state
->es_shader
) {
5215 const glsl_type
*check_type
= var
->type
->without_array();
5216 if (check_type
->is_boolean() ||
5217 check_type
->contains_opaque()) {
5218 _mesa_glsl_error(&loc
, state
,
5219 "fragment shader input cannot have type %s",
5222 if (var
->type
->is_array() &&
5223 var
->type
->fields
.array
->is_array()) {
5224 _mesa_glsl_error(&loc
, state
,
5226 "cannot have an array of arrays",
5227 _mesa_shader_stage_to_string(state
->stage
));
5229 if (var
->type
->is_array() &&
5230 var
->type
->fields
.array
->is_record()) {
5231 _mesa_glsl_error(&loc
, state
,
5232 "fragment shader input "
5233 "cannot have an array of structs");
5235 if (var
->type
->is_record()) {
5236 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5237 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5238 var
->type
->fields
.structure
[i
].type
->is_record())
5239 _mesa_glsl_error(&loc
, state
,
5240 "fragment shader input cannot have "
5241 "a struct that contains an "
5246 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5247 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5248 handle_tess_shader_input_decl(state
, loc
, var
);
5250 } else if (var
->data
.mode
== ir_var_shader_out
) {
5251 const glsl_type
*check_type
= var
->type
->without_array();
5253 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5255 * It is a compile-time error to declare a fragment shader output
5256 * that contains any of the following:
5258 * * A Boolean type (bool, bvec2 ...)
5259 * * A double-precision scalar or vector (double, dvec2 ...)
5264 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5265 if (check_type
->is_record() || check_type
->is_matrix())
5266 _mesa_glsl_error(&loc
, state
,
5267 "fragment shader output "
5268 "cannot have struct or matrix type");
5269 switch (check_type
->base_type
) {
5270 case GLSL_TYPE_UINT
:
5272 case GLSL_TYPE_FLOAT
:
5275 _mesa_glsl_error(&loc
, state
,
5276 "fragment shader output cannot have "
5277 "type %s", check_type
->name
);
5281 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5283 * It is a compile-time error to declare a vertex shader output
5284 * with, or that contains, any of the following types:
5288 * * An array of arrays
5289 * * An array of structures
5290 * * A structure containing an array
5291 * * A structure containing a structure
5293 * It is a compile-time error to declare a fragment shader output
5294 * with, or that contains, any of the following types:
5300 * * An array of array
5302 * ES 3.20 updates this to apply to tessellation and geometry shaders
5303 * as well. Because there are per-vertex arrays in the new stages,
5304 * it strikes the "array of..." rules and replaces them with these:
5306 * * For per-vertex-arrayed variables (applies to tessellation
5307 * control, tessellation evaluation and geometry shaders):
5309 * * Per-vertex-arrayed arrays of arrays
5310 * * Per-vertex-arrayed arrays of structures
5312 * * For non-per-vertex-arrayed variables:
5314 * * An array of arrays
5315 * * An array of structures
5317 * which basically says to unwrap the per-vertex aspect and apply
5320 if (state
->es_shader
) {
5321 if (var
->type
->is_array() &&
5322 var
->type
->fields
.array
->is_array()) {
5323 _mesa_glsl_error(&loc
, state
,
5325 "cannot have an array of arrays",
5326 _mesa_shader_stage_to_string(state
->stage
));
5328 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5329 const glsl_type
*type
= var
->type
;
5331 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5332 !var
->data
.patch
&& var
->type
->is_array()) {
5333 type
= var
->type
->fields
.array
;
5336 if (type
->is_array() && type
->fields
.array
->is_record()) {
5337 _mesa_glsl_error(&loc
, state
,
5338 "%s shader output cannot have "
5339 "an array of structs",
5340 _mesa_shader_stage_to_string(state
->stage
));
5342 if (type
->is_record()) {
5343 for (unsigned i
= 0; i
< type
->length
; i
++) {
5344 if (type
->fields
.structure
[i
].type
->is_array() ||
5345 type
->fields
.structure
[i
].type
->is_record())
5346 _mesa_glsl_error(&loc
, state
,
5347 "%s shader output cannot have a "
5348 "struct that contains an "
5350 _mesa_shader_stage_to_string(state
->stage
));
5356 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5357 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5359 } else if (var
->type
->contains_subroutine()) {
5360 /* declare subroutine uniforms as hidden */
5361 var
->data
.how_declared
= ir_var_hidden
;
5364 /* From section 4.3.4 of the GLSL 4.00 spec:
5365 * "Input variables may not be declared using the patch in qualifier
5366 * in tessellation control or geometry shaders."
5368 * From section 4.3.6 of the GLSL 4.00 spec:
5369 * "It is an error to use patch out in a vertex, tessellation
5370 * evaluation, or geometry shader."
5372 * This doesn't explicitly forbid using them in a fragment shader, but
5373 * that's probably just an oversight.
5375 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5376 && this->type
->qualifier
.flags
.q
.patch
5377 && this->type
->qualifier
.flags
.q
.in
) {
5379 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5380 "tessellation evaluation shader");
5383 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5384 && this->type
->qualifier
.flags
.q
.patch
5385 && this->type
->qualifier
.flags
.q
.out
) {
5387 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5388 "tessellation control shader");
5391 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5393 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5394 state
->check_precision_qualifiers_allowed(&loc
);
5397 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5398 !precision_qualifier_allowed(var
->type
)) {
5399 _mesa_glsl_error(&loc
, state
,
5400 "precision qualifiers apply only to floating point"
5401 ", integer and opaque types");
5404 /* From section 4.1.7 of the GLSL 4.40 spec:
5406 * "[Opaque types] can only be declared as function
5407 * parameters or uniform-qualified variables."
5409 * From section 4.1.7 of the ARB_bindless_texture spec:
5411 * "Samplers may be declared as shader inputs and outputs, as uniform
5412 * variables, as temporary variables, and as function parameters."
5414 * From section 4.1.X of the ARB_bindless_texture spec:
5416 * "Images may be declared as shader inputs and outputs, as uniform
5417 * variables, as temporary variables, and as function parameters."
5419 if (!this->type
->qualifier
.flags
.q
.uniform
&&
5420 (var_type
->contains_atomic() ||
5421 (!state
->has_bindless() && var_type
->contains_opaque()))) {
5422 _mesa_glsl_error(&loc
, state
,
5423 "%s variables must be declared uniform",
5424 state
->has_bindless() ? "atomic" : "opaque");
5427 /* Process the initializer and add its instructions to a temporary
5428 * list. This list will be added to the instruction stream (below) after
5429 * the declaration is added. This is done because in some cases (such as
5430 * redeclarations) the declaration may not actually be added to the
5431 * instruction stream.
5433 exec_list initializer_instructions
;
5435 /* Examine var name here since var may get deleted in the next call */
5436 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5438 bool is_redeclaration
;
5439 var
= get_variable_being_redeclared(&var
, decl
->get_location(), state
,
5440 false /* allow_all_redeclarations */,
5442 if (is_redeclaration
) {
5444 var
->data
.how_declared
== ir_var_declared_in_block
) {
5445 _mesa_glsl_error(&loc
, state
,
5446 "`%s' has already been redeclared using "
5447 "gl_PerVertex", var
->name
);
5449 var
->data
.how_declared
= ir_var_declared_normally
;
5452 if (decl
->initializer
!= NULL
) {
5453 result
= process_initializer(var
,
5455 &initializer_instructions
, state
);
5457 validate_array_dimensions(var_type
, state
, &loc
);
5460 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5462 * "It is an error to write to a const variable outside of
5463 * its declaration, so they must be initialized when
5466 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5467 _mesa_glsl_error(& loc
, state
,
5468 "const declaration of `%s' must be initialized",
5472 if (state
->es_shader
) {
5473 const glsl_type
*const t
= var
->type
;
5475 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5477 * The GL_OES_tessellation_shader spec says about inputs:
5479 * "Declaring an array size is optional. If no size is specified,
5480 * it will be taken from the implementation-dependent maximum
5481 * patch size (gl_MaxPatchVertices)."
5483 * and about TCS outputs:
5485 * "If no size is specified, it will be taken from output patch
5486 * size declared in the shader."
5488 * The GL_OES_geometry_shader spec says:
5490 * "All geometry shader input unsized array declarations will be
5491 * sized by an earlier input primitive layout qualifier, when
5492 * present, as per the following table."
5494 const bool implicitly_sized
=
5495 (var
->data
.mode
== ir_var_shader_in
&&
5496 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5497 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5498 (var
->data
.mode
== ir_var_shader_out
&&
5499 state
->stage
== MESA_SHADER_TESS_CTRL
);
5501 if (t
->is_unsized_array() && !implicitly_sized
)
5502 /* Section 10.17 of the GLSL ES 1.00 specification states that
5503 * unsized array declarations have been removed from the language.
5504 * Arrays that are sized using an initializer are still explicitly
5505 * sized. However, GLSL ES 1.00 does not allow array
5506 * initializers. That is only allowed in GLSL ES 3.00.
5508 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5510 * "An array type can also be formed without specifying a size
5511 * if the definition includes an initializer:
5513 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5514 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5519 _mesa_glsl_error(& loc
, state
,
5520 "unsized array declarations are not allowed in "
5524 /* Section 4.4.6.1 Atomic Counter Layout Qualifiers of the GLSL 4.60 spec:
5526 * "It is a compile-time error to declare an unsized array of
5529 if (var
->type
->is_unsized_array() &&
5530 var
->type
->without_array()->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
5531 _mesa_glsl_error(& loc
, state
,
5532 "Unsized array of atomic_uint is not allowed");
5535 /* If the declaration is not a redeclaration, there are a few additional
5536 * semantic checks that must be applied. In addition, variable that was
5537 * created for the declaration should be added to the IR stream.
5539 if (!is_redeclaration
) {
5540 validate_identifier(decl
->identifier
, loc
, state
);
5542 /* Add the variable to the symbol table. Note that the initializer's
5543 * IR was already processed earlier (though it hasn't been emitted
5544 * yet), without the variable in scope.
5546 * This differs from most C-like languages, but it follows the GLSL
5547 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5550 * "Within a declaration, the scope of a name starts immediately
5551 * after the initializer if present or immediately after the name
5552 * being declared if not."
5554 if (!state
->symbols
->add_variable(var
)) {
5555 YYLTYPE loc
= this->get_location();
5556 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5557 "current scope", decl
->identifier
);
5561 /* Push the variable declaration to the top. It means that all the
5562 * variable declarations will appear in a funny last-to-first order,
5563 * but otherwise we run into trouble if a function is prototyped, a
5564 * global var is decled, then the function is defined with usage of
5565 * the global var. See glslparsertest's CorrectModule.frag.
5567 instructions
->push_head(var
);
5570 instructions
->append_list(&initializer_instructions
);
5574 /* Generally, variable declarations do not have r-values. However,
5575 * one is used for the declaration in
5577 * while (bool b = some_condition()) {
5581 * so we return the rvalue from the last seen declaration here.
5588 ast_parameter_declarator::hir(exec_list
*instructions
,
5589 struct _mesa_glsl_parse_state
*state
)
5592 const struct glsl_type
*type
;
5593 const char *name
= NULL
;
5594 YYLTYPE loc
= this->get_location();
5596 type
= this->type
->glsl_type(& name
, state
);
5600 _mesa_glsl_error(& loc
, state
,
5601 "invalid type `%s' in declaration of `%s'",
5602 name
, this->identifier
);
5604 _mesa_glsl_error(& loc
, state
,
5605 "invalid type in declaration of `%s'",
5609 type
= glsl_type::error_type
;
5612 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5614 * "Functions that accept no input arguments need not use void in the
5615 * argument list because prototypes (or definitions) are required and
5616 * therefore there is no ambiguity when an empty argument list "( )" is
5617 * declared. The idiom "(void)" as a parameter list is provided for
5620 * Placing this check here prevents a void parameter being set up
5621 * for a function, which avoids tripping up checks for main taking
5622 * parameters and lookups of an unnamed symbol.
5624 if (type
->is_void()) {
5625 if (this->identifier
!= NULL
)
5626 _mesa_glsl_error(& loc
, state
,
5627 "named parameter cannot have type `void'");
5633 if (formal_parameter
&& (this->identifier
== NULL
)) {
5634 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5638 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5639 * call already handled the "vec4[..] foo" case.
5641 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5643 if (!type
->is_error() && type
->is_unsized_array()) {
5644 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5646 type
= glsl_type::error_type
;
5650 ir_variable
*var
= new(ctx
)
5651 ir_variable(type
, this->identifier
, ir_var_function_in
);
5653 /* Apply any specified qualifiers to the parameter declaration. Note that
5654 * for function parameters the default mode is 'in'.
5656 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5659 /* From section 4.1.7 of the GLSL 4.40 spec:
5661 * "Opaque variables cannot be treated as l-values; hence cannot
5662 * be used as out or inout function parameters, nor can they be
5665 * From section 4.1.7 of the ARB_bindless_texture spec:
5667 * "Samplers can be used as l-values, so can be assigned into and used
5668 * as "out" and "inout" function parameters."
5670 * From section 4.1.X of the ARB_bindless_texture spec:
5672 * "Images can be used as l-values, so can be assigned into and used as
5673 * "out" and "inout" function parameters."
5675 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5676 && (type
->contains_atomic() ||
5677 (!state
->has_bindless() && type
->contains_opaque()))) {
5678 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5679 "contain %s variables",
5680 state
->has_bindless() ? "atomic" : "opaque");
5681 type
= glsl_type::error_type
;
5684 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5686 * "When calling a function, expressions that do not evaluate to
5687 * l-values cannot be passed to parameters declared as out or inout."
5689 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5691 * "Other binary or unary expressions, non-dereferenced arrays,
5692 * function names, swizzles with repeated fields, and constants
5693 * cannot be l-values."
5695 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5696 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5698 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5700 && !state
->check_version(120, 100, &loc
,
5701 "arrays cannot be out or inout parameters")) {
5702 type
= glsl_type::error_type
;
5705 instructions
->push_tail(var
);
5707 /* Parameter declarations do not have r-values.
5714 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5716 exec_list
*ir_parameters
,
5717 _mesa_glsl_parse_state
*state
)
5719 ast_parameter_declarator
*void_param
= NULL
;
5722 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5723 param
->formal_parameter
= formal
;
5724 param
->hir(ir_parameters
, state
);
5732 if ((void_param
!= NULL
) && (count
> 1)) {
5733 YYLTYPE loc
= void_param
->get_location();
5735 _mesa_glsl_error(& loc
, state
,
5736 "`void' parameter must be only parameter");
5742 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5744 /* IR invariants disallow function declarations or definitions
5745 * nested within other function definitions. But there is no
5746 * requirement about the relative order of function declarations
5747 * and definitions with respect to one another. So simply insert
5748 * the new ir_function block at the end of the toplevel instruction
5751 state
->toplevel_ir
->push_tail(f
);
5756 ast_function::hir(exec_list
*instructions
,
5757 struct _mesa_glsl_parse_state
*state
)
5760 ir_function
*f
= NULL
;
5761 ir_function_signature
*sig
= NULL
;
5762 exec_list hir_parameters
;
5763 YYLTYPE loc
= this->get_location();
5765 const char *const name
= identifier
;
5767 /* New functions are always added to the top-level IR instruction stream,
5768 * so this instruction list pointer is ignored. See also emit_function
5771 (void) instructions
;
5773 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5775 * "Function declarations (prototypes) cannot occur inside of functions;
5776 * they must be at global scope, or for the built-in functions, outside
5777 * the global scope."
5779 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5781 * "User defined functions may only be defined within the global scope."
5783 * Note that this language does not appear in GLSL 1.10.
5785 if ((state
->current_function
!= NULL
) &&
5786 state
->is_version(120, 100)) {
5787 YYLTYPE loc
= this->get_location();
5788 _mesa_glsl_error(&loc
, state
,
5789 "declaration of function `%s' not allowed within "
5790 "function body", name
);
5793 validate_identifier(name
, this->get_location(), state
);
5795 /* Convert the list of function parameters to HIR now so that they can be
5796 * used below to compare this function's signature with previously seen
5797 * signatures for functions with the same name.
5799 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5801 & hir_parameters
, state
);
5803 const char *return_type_name
;
5804 const glsl_type
*return_type
=
5805 this->return_type
->glsl_type(& return_type_name
, state
);
5808 YYLTYPE loc
= this->get_location();
5809 _mesa_glsl_error(&loc
, state
,
5810 "function `%s' has undeclared return type `%s'",
5811 name
, return_type_name
);
5812 return_type
= glsl_type::error_type
;
5815 /* ARB_shader_subroutine states:
5816 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5817 * subroutine(...) to a function declaration."
5819 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
5820 YYLTYPE loc
= this->get_location();
5821 _mesa_glsl_error(&loc
, state
,
5822 "function declaration `%s' cannot have subroutine prepended",
5826 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5827 * "No qualifier is allowed on the return type of a function."
5829 if (this->return_type
->has_qualifiers(state
)) {
5830 YYLTYPE loc
= this->get_location();
5831 _mesa_glsl_error(& loc
, state
,
5832 "function `%s' return type has qualifiers", name
);
5835 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5837 * "Arrays are allowed as arguments and as the return type. In both
5838 * cases, the array must be explicitly sized."
5840 if (return_type
->is_unsized_array()) {
5841 YYLTYPE loc
= this->get_location();
5842 _mesa_glsl_error(& loc
, state
,
5843 "function `%s' return type array must be explicitly "
5847 /* From Section 6.1 (Function Definitions) of the GLSL 1.00 spec:
5849 * "Arrays are allowed as arguments, but not as the return type. [...]
5850 * The return type can also be a structure if the structure does not
5851 * contain an array."
5853 if (state
->language_version
== 100 && return_type
->contains_array()) {
5854 YYLTYPE loc
= this->get_location();
5855 _mesa_glsl_error(& loc
, state
,
5856 "function `%s' return type contains an array", name
);
5859 /* From section 4.1.7 of the GLSL 4.40 spec:
5861 * "[Opaque types] can only be declared as function parameters
5862 * or uniform-qualified variables."
5864 * The ARB_bindless_texture spec doesn't clearly state this, but as it says
5865 * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X,
5866 * (Images)", this should be allowed.
5868 if (return_type
->contains_atomic() ||
5869 (!state
->has_bindless() && return_type
->contains_opaque())) {
5870 YYLTYPE loc
= this->get_location();
5871 _mesa_glsl_error(&loc
, state
,
5872 "function `%s' return type can't contain an %s type",
5873 name
, state
->has_bindless() ? "atomic" : "opaque");
5877 if (return_type
->is_subroutine()) {
5878 YYLTYPE loc
= this->get_location();
5879 _mesa_glsl_error(&loc
, state
,
5880 "function `%s' return type can't be a subroutine type",
5885 /* Create an ir_function if one doesn't already exist. */
5886 f
= state
->symbols
->get_function(name
);
5888 f
= new(ctx
) ir_function(name
);
5889 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
5890 if (!state
->symbols
->add_function(f
)) {
5891 /* This function name shadows a non-function use of the same name. */
5892 YYLTYPE loc
= this->get_location();
5893 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5894 "non-function", name
);
5898 emit_function(state
, f
);
5901 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5903 * "A shader cannot redefine or overload built-in functions."
5905 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5907 * "User code can overload the built-in functions but cannot redefine
5910 if (state
->es_shader
) {
5911 /* Local shader has no exact candidates; check the built-ins. */
5912 _mesa_glsl_initialize_builtin_functions();
5913 if (state
->language_version
>= 300 &&
5914 _mesa_glsl_has_builtin_function(state
, name
)) {
5915 YYLTYPE loc
= this->get_location();
5916 _mesa_glsl_error(& loc
, state
,
5917 "A shader cannot redefine or overload built-in "
5918 "function `%s' in GLSL ES 3.00", name
);
5922 if (state
->language_version
== 100) {
5923 ir_function_signature
*sig
=
5924 _mesa_glsl_find_builtin_function(state
, name
, &hir_parameters
);
5925 if (sig
&& sig
->is_builtin()) {
5926 _mesa_glsl_error(& loc
, state
,
5927 "A shader cannot redefine built-in "
5928 "function `%s' in GLSL ES 1.00", name
);
5933 /* Verify that this function's signature either doesn't match a previously
5934 * seen signature for a function with the same name, or, if a match is found,
5935 * that the previously seen signature does not have an associated definition.
5937 if (state
->es_shader
|| f
->has_user_signature()) {
5938 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5940 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5941 if (badvar
!= NULL
) {
5942 YYLTYPE loc
= this->get_location();
5944 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5945 "qualifiers don't match prototype", name
, badvar
);
5948 if (sig
->return_type
!= return_type
) {
5949 YYLTYPE loc
= this->get_location();
5951 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5952 "match prototype", name
);
5955 if (sig
->is_defined
) {
5956 if (is_definition
) {
5957 YYLTYPE loc
= this->get_location();
5958 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5960 /* We just encountered a prototype that exactly matches a
5961 * function that's already been defined. This is redundant,
5962 * and we should ignore it.
5966 } else if (state
->language_version
== 100 && !is_definition
) {
5967 /* From the GLSL 1.00 spec, section 4.2.7:
5969 * "A particular variable, structure or function declaration
5970 * may occur at most once within a scope with the exception
5971 * that a single function prototype plus the corresponding
5972 * function definition are allowed."
5974 YYLTYPE loc
= this->get_location();
5975 _mesa_glsl_error(&loc
, state
, "function `%s' redeclared", name
);
5980 /* Verify the return type of main() */
5981 if (strcmp(name
, "main") == 0) {
5982 if (! return_type
->is_void()) {
5983 YYLTYPE loc
= this->get_location();
5985 _mesa_glsl_error(& loc
, state
, "main() must return void");
5988 if (!hir_parameters
.is_empty()) {
5989 YYLTYPE loc
= this->get_location();
5991 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5995 /* Finish storing the information about this new function in its signature.
5998 sig
= new(ctx
) ir_function_signature(return_type
);
5999 f
->add_signature(sig
);
6002 sig
->replace_parameters(&hir_parameters
);
6005 if (this->return_type
->qualifier
.subroutine_list
) {
6008 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
6009 unsigned qual_index
;
6010 if (process_qualifier_constant(state
, &loc
, "index",
6011 this->return_type
->qualifier
.index
,
6013 if (!state
->has_explicit_uniform_location()) {
6014 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
6015 "GL_ARB_explicit_uniform_location or "
6017 } else if (qual_index
>= MAX_SUBROUTINES
) {
6018 _mesa_glsl_error(&loc
, state
,
6019 "invalid subroutine index (%d) index must "
6020 "be a number between 0 and "
6021 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
6022 MAX_SUBROUTINES
- 1);
6024 f
->subroutine_index
= qual_index
;
6029 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
6030 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
6031 f
->num_subroutine_types
);
6033 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
6034 const struct glsl_type
*type
;
6035 /* the subroutine type must be already declared */
6036 type
= state
->symbols
->get_type(decl
->identifier
);
6038 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
6041 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
6042 ir_function
*fn
= state
->subroutine_types
[i
];
6043 ir_function_signature
*tsig
= NULL
;
6045 if (strcmp(fn
->name
, decl
->identifier
))
6048 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
6051 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
6053 if (tsig
->return_type
!= sig
->return_type
) {
6054 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
6058 f
->subroutine_types
[idx
++] = type
;
6060 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
6062 state
->num_subroutines
+ 1);
6063 state
->subroutines
[state
->num_subroutines
] = f
;
6064 state
->num_subroutines
++;
6068 if (this->return_type
->qualifier
.is_subroutine_decl()) {
6069 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
6070 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
6073 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
6075 state
->num_subroutine_types
+ 1);
6076 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
6077 state
->num_subroutine_types
++;
6079 f
->is_subroutine
= true;
6082 /* Function declarations (prototypes) do not have r-values.
6089 ast_function_definition::hir(exec_list
*instructions
,
6090 struct _mesa_glsl_parse_state
*state
)
6092 prototype
->is_definition
= true;
6093 prototype
->hir(instructions
, state
);
6095 ir_function_signature
*signature
= prototype
->signature
;
6096 if (signature
== NULL
)
6099 assert(state
->current_function
== NULL
);
6100 state
->current_function
= signature
;
6101 state
->found_return
= false;
6103 /* Duplicate parameters declared in the prototype as concrete variables.
6104 * Add these to the symbol table.
6106 state
->symbols
->push_scope();
6107 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
6108 assert(var
->as_variable() != NULL
);
6110 /* The only way a parameter would "exist" is if two parameters have
6113 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
6114 YYLTYPE loc
= this->get_location();
6116 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
6118 state
->symbols
->add_variable(var
);
6122 /* Convert the body of the function to HIR. */
6123 this->body
->hir(&signature
->body
, state
);
6124 signature
->is_defined
= true;
6126 state
->symbols
->pop_scope();
6128 assert(state
->current_function
== signature
);
6129 state
->current_function
= NULL
;
6131 if (!signature
->return_type
->is_void() && !state
->found_return
) {
6132 YYLTYPE loc
= this->get_location();
6133 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
6134 "%s, but no return statement",
6135 signature
->function_name(),
6136 signature
->return_type
->name
);
6139 /* Function definitions do not have r-values.
6146 ast_jump_statement::hir(exec_list
*instructions
,
6147 struct _mesa_glsl_parse_state
*state
)
6154 assert(state
->current_function
);
6156 if (opt_return_value
) {
6157 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
6159 /* The value of the return type can be NULL if the shader says
6160 * 'return foo();' and foo() is a function that returns void.
6162 * NOTE: The GLSL spec doesn't say that this is an error. The type
6163 * of the return value is void. If the return type of the function is
6164 * also void, then this should compile without error. Seriously.
6166 const glsl_type
*const ret_type
=
6167 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
6169 /* Implicit conversions are not allowed for return values prior to
6170 * ARB_shading_language_420pack.
6172 if (state
->current_function
->return_type
!= ret_type
) {
6173 YYLTYPE loc
= this->get_location();
6175 if (state
->has_420pack()) {
6176 if (!apply_implicit_conversion(state
->current_function
->return_type
,
6178 _mesa_glsl_error(& loc
, state
,
6179 "could not implicitly convert return value "
6180 "to %s, in function `%s'",
6181 state
->current_function
->return_type
->name
,
6182 state
->current_function
->function_name());
6185 _mesa_glsl_error(& loc
, state
,
6186 "`return' with wrong type %s, in function `%s' "
6189 state
->current_function
->function_name(),
6190 state
->current_function
->return_type
->name
);
6192 } else if (state
->current_function
->return_type
->base_type
==
6194 YYLTYPE loc
= this->get_location();
6196 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
6197 * specs add a clarification:
6199 * "A void function can only use return without a return argument, even if
6200 * the return argument has void type. Return statements only accept values:
6203 * void func2() { return func1(); } // illegal return statement"
6205 _mesa_glsl_error(& loc
, state
,
6206 "void functions can only use `return' without a "
6210 inst
= new(ctx
) ir_return(ret
);
6212 if (state
->current_function
->return_type
->base_type
!=
6214 YYLTYPE loc
= this->get_location();
6216 _mesa_glsl_error(& loc
, state
,
6217 "`return' with no value, in function %s returning "
6219 state
->current_function
->function_name());
6221 inst
= new(ctx
) ir_return
;
6224 state
->found_return
= true;
6225 instructions
->push_tail(inst
);
6230 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6231 YYLTYPE loc
= this->get_location();
6233 _mesa_glsl_error(& loc
, state
,
6234 "`discard' may only appear in a fragment shader");
6236 instructions
->push_tail(new(ctx
) ir_discard
);
6241 if (mode
== ast_continue
&&
6242 state
->loop_nesting_ast
== NULL
) {
6243 YYLTYPE loc
= this->get_location();
6245 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
6246 } else if (mode
== ast_break
&&
6247 state
->loop_nesting_ast
== NULL
&&
6248 state
->switch_state
.switch_nesting_ast
== NULL
) {
6249 YYLTYPE loc
= this->get_location();
6251 _mesa_glsl_error(& loc
, state
,
6252 "break may only appear in a loop or a switch");
6254 /* For a loop, inline the for loop expression again, since we don't
6255 * know where near the end of the loop body the normal copy of it is
6256 * going to be placed. Same goes for the condition for a do-while
6259 if (state
->loop_nesting_ast
!= NULL
&&
6260 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
6261 if (state
->loop_nesting_ast
->rest_expression
) {
6262 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
6265 if (state
->loop_nesting_ast
->mode
==
6266 ast_iteration_statement::ast_do_while
) {
6267 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
6271 if (state
->switch_state
.is_switch_innermost
&&
6272 mode
== ast_continue
) {
6273 /* Set 'continue_inside' to true. */
6274 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6275 ir_dereference_variable
*deref_continue_inside_var
=
6276 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6277 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6280 /* Break out from the switch, continue for the loop will
6281 * be called right after switch. */
6282 ir_loop_jump
*const jump
=
6283 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6284 instructions
->push_tail(jump
);
6286 } else if (state
->switch_state
.is_switch_innermost
&&
6287 mode
== ast_break
) {
6288 /* Force break out of switch by inserting a break. */
6289 ir_loop_jump
*const jump
=
6290 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6291 instructions
->push_tail(jump
);
6293 ir_loop_jump
*const jump
=
6294 new(ctx
) ir_loop_jump((mode
== ast_break
)
6295 ? ir_loop_jump::jump_break
6296 : ir_loop_jump::jump_continue
);
6297 instructions
->push_tail(jump
);
6304 /* Jump instructions do not have r-values.
6311 ast_selection_statement::hir(exec_list
*instructions
,
6312 struct _mesa_glsl_parse_state
*state
)
6316 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6318 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6320 * "Any expression whose type evaluates to a Boolean can be used as the
6321 * conditional expression bool-expression. Vector types are not accepted
6322 * as the expression to if."
6324 * The checks are separated so that higher quality diagnostics can be
6325 * generated for cases where both rules are violated.
6327 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6328 YYLTYPE loc
= this->condition
->get_location();
6330 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6334 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6336 if (then_statement
!= NULL
) {
6337 state
->symbols
->push_scope();
6338 then_statement
->hir(& stmt
->then_instructions
, state
);
6339 state
->symbols
->pop_scope();
6342 if (else_statement
!= NULL
) {
6343 state
->symbols
->push_scope();
6344 else_statement
->hir(& stmt
->else_instructions
, state
);
6345 state
->symbols
->pop_scope();
6348 instructions
->push_tail(stmt
);
6350 /* if-statements do not have r-values.
6357 /** Value of the case label. */
6360 /** Does this label occur after the default? */
6364 * AST for the case label.
6366 * This is only used to generate error messages for duplicate labels.
6368 ast_expression
*ast
;
6371 /* Used for detection of duplicate case values, compare
6372 * given contents directly.
6375 compare_case_value(const void *a
, const void *b
)
6377 return ((struct case_label
*) a
)->value
== ((struct case_label
*) b
)->value
;
6381 /* Used for detection of duplicate case values, just
6382 * returns key contents as is.
6385 key_contents(const void *key
)
6387 return ((struct case_label
*) key
)->value
;
6392 ast_switch_statement::hir(exec_list
*instructions
,
6393 struct _mesa_glsl_parse_state
*state
)
6397 ir_rvalue
*const test_expression
=
6398 this->test_expression
->hir(instructions
, state
);
6400 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6402 * "The type of init-expression in a switch statement must be a
6405 if (!test_expression
->type
->is_scalar() ||
6406 !test_expression
->type
->is_integer()) {
6407 YYLTYPE loc
= this->test_expression
->get_location();
6409 _mesa_glsl_error(& loc
,
6411 "switch-statement expression must be scalar "
6416 /* Track the switch-statement nesting in a stack-like manner.
6418 struct glsl_switch_state saved
= state
->switch_state
;
6420 state
->switch_state
.is_switch_innermost
= true;
6421 state
->switch_state
.switch_nesting_ast
= this;
6422 state
->switch_state
.labels_ht
=
6423 _mesa_hash_table_create(NULL
, key_contents
,
6424 compare_case_value
);
6425 state
->switch_state
.previous_default
= NULL
;
6427 /* Initalize is_fallthru state to false.
6429 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6430 state
->switch_state
.is_fallthru_var
=
6431 new(ctx
) ir_variable(glsl_type::bool_type
,
6432 "switch_is_fallthru_tmp",
6434 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6436 ir_dereference_variable
*deref_is_fallthru_var
=
6437 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6438 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6441 /* Initialize continue_inside state to false.
6443 state
->switch_state
.continue_inside
=
6444 new(ctx
) ir_variable(glsl_type::bool_type
,
6445 "continue_inside_tmp",
6447 instructions
->push_tail(state
->switch_state
.continue_inside
);
6449 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6450 ir_dereference_variable
*deref_continue_inside_var
=
6451 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6452 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6455 state
->switch_state
.run_default
=
6456 new(ctx
) ir_variable(glsl_type::bool_type
,
6459 instructions
->push_tail(state
->switch_state
.run_default
);
6461 /* Loop around the switch is used for flow control. */
6462 ir_loop
* loop
= new(ctx
) ir_loop();
6463 instructions
->push_tail(loop
);
6465 /* Cache test expression.
6467 test_to_hir(&loop
->body_instructions
, state
);
6469 /* Emit code for body of switch stmt.
6471 body
->hir(&loop
->body_instructions
, state
);
6473 /* Insert a break at the end to exit loop. */
6474 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6475 loop
->body_instructions
.push_tail(jump
);
6477 /* If we are inside loop, check if continue got called inside switch. */
6478 if (state
->loop_nesting_ast
!= NULL
) {
6479 ir_dereference_variable
*deref_continue_inside
=
6480 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6481 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6482 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6484 if (state
->loop_nesting_ast
!= NULL
) {
6485 if (state
->loop_nesting_ast
->rest_expression
) {
6486 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6489 if (state
->loop_nesting_ast
->mode
==
6490 ast_iteration_statement::ast_do_while
) {
6491 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6494 irif
->then_instructions
.push_tail(jump
);
6495 instructions
->push_tail(irif
);
6498 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6500 state
->switch_state
= saved
;
6502 /* Switch statements do not have r-values. */
6508 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6509 struct _mesa_glsl_parse_state
*state
)
6513 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6514 * on the switch test case. The first one would be already raised when
6515 * getting the test_expression at ast_switch_statement::hir
6517 test_expression
->set_is_lhs(true);
6518 /* Cache value of test expression. */
6519 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6521 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6524 ir_dereference_variable
*deref_test_var
=
6525 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6527 instructions
->push_tail(state
->switch_state
.test_var
);
6528 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6533 ast_switch_body::hir(exec_list
*instructions
,
6534 struct _mesa_glsl_parse_state
*state
)
6537 stmts
->hir(instructions
, state
);
6539 /* Switch bodies do not have r-values. */
6544 ast_case_statement_list::hir(exec_list
*instructions
,
6545 struct _mesa_glsl_parse_state
*state
)
6547 exec_list default_case
, after_default
, tmp
;
6549 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6550 case_stmt
->hir(&tmp
, state
);
6553 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6554 default_case
.append_list(&tmp
);
6558 /* If default case found, append 'after_default' list. */
6559 if (!default_case
.is_empty())
6560 after_default
.append_list(&tmp
);
6562 instructions
->append_list(&tmp
);
6565 /* Handle the default case. This is done here because default might not be
6566 * the last case. We need to add checks against following cases first to see
6567 * if default should be chosen or not.
6569 if (!default_case
.is_empty()) {
6570 struct hash_entry
*entry
;
6571 ir_factory
body(instructions
, state
);
6573 ir_expression
*cmp
= NULL
;
6575 hash_table_foreach(state
->switch_state
.labels_ht
, entry
) {
6576 const struct case_label
*const l
= (struct case_label
*) entry
->data
;
6578 /* If the switch init-value is the value of one of the labels that
6579 * occurs after the default case, disable execution of the default
6582 if (l
->after_default
) {
6583 ir_constant
*const cnst
=
6584 state
->switch_state
.test_var
->type
->base_type
== GLSL_TYPE_UINT
6585 ? body
.constant(unsigned(l
->value
))
6586 : body
.constant(int(l
->value
));
6589 ? equal(cnst
, state
->switch_state
.test_var
)
6590 : logic_or(cmp
, equal(cnst
, state
->switch_state
.test_var
));
6595 body
.emit(assign(state
->switch_state
.run_default
, logic_not(cmp
)));
6597 body
.emit(assign(state
->switch_state
.run_default
, body
.constant(true)));
6599 /* Append default case and all cases after it. */
6600 instructions
->append_list(&default_case
);
6601 instructions
->append_list(&after_default
);
6604 /* Case statements do not have r-values. */
6609 ast_case_statement::hir(exec_list
*instructions
,
6610 struct _mesa_glsl_parse_state
*state
)
6612 labels
->hir(instructions
, state
);
6614 /* Guard case statements depending on fallthru state. */
6615 ir_dereference_variable
*const deref_fallthru_guard
=
6616 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6617 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6619 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6620 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6622 instructions
->push_tail(test_fallthru
);
6624 /* Case statements do not have r-values. */
6630 ast_case_label_list::hir(exec_list
*instructions
,
6631 struct _mesa_glsl_parse_state
*state
)
6633 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6634 label
->hir(instructions
, state
);
6636 /* Case labels do not have r-values. */
6641 ast_case_label::hir(exec_list
*instructions
,
6642 struct _mesa_glsl_parse_state
*state
)
6644 ir_factory
body(instructions
, state
);
6646 ir_variable
*const fallthru_var
= state
->switch_state
.is_fallthru_var
;
6648 /* If not default case, ... */
6649 if (this->test_value
!= NULL
) {
6650 /* Conditionally set fallthru state based on
6651 * comparison of cached test expression value to case label.
6653 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6654 ir_constant
*label_const
=
6655 label_rval
->constant_expression_value(body
.mem_ctx
);
6658 YYLTYPE loc
= this->test_value
->get_location();
6660 _mesa_glsl_error(& loc
, state
,
6661 "switch statement case label must be a "
6662 "constant expression");
6664 /* Stuff a dummy value in to allow processing to continue. */
6665 label_const
= body
.constant(0);
6668 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6669 &label_const
->value
.u
[0]);
6672 const struct case_label
*const l
=
6673 (struct case_label
*) entry
->data
;
6674 const ast_expression
*const previous_label
= l
->ast
;
6675 YYLTYPE loc
= this->test_value
->get_location();
6677 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6679 loc
= previous_label
->get_location();
6680 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6682 struct case_label
*l
= ralloc(state
->switch_state
.labels_ht
,
6685 l
->value
= label_const
->value
.u
[0];
6686 l
->after_default
= state
->switch_state
.previous_default
!= NULL
;
6687 l
->ast
= this->test_value
;
6689 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6690 &label_const
->value
.u
[0],
6695 /* Create an r-value version of the ir_constant label here (after we may
6696 * have created a fake one in error cases) that can be passed to
6697 * apply_implicit_conversion below.
6699 ir_rvalue
*label
= label_const
;
6701 ir_rvalue
*deref_test_var
=
6702 new(body
.mem_ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6705 * From GLSL 4.40 specification section 6.2 ("Selection"):
6707 * "The type of the init-expression value in a switch statement must
6708 * be a scalar int or uint. The type of the constant-expression value
6709 * in a case label also must be a scalar int or uint. When any pair
6710 * of these values is tested for "equal value" and the types do not
6711 * match, an implicit conversion will be done to convert the int to a
6712 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6715 if (label
->type
!= state
->switch_state
.test_var
->type
) {
6716 YYLTYPE loc
= this->test_value
->get_location();
6718 const glsl_type
*type_a
= label
->type
;
6719 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6721 /* Check if int->uint implicit conversion is supported. */
6722 bool integer_conversion_supported
=
6723 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6726 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6727 !integer_conversion_supported
) {
6728 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6729 "init-expression and case label (%s != %s)",
6730 type_a
->name
, type_b
->name
);
6732 /* Conversion of the case label. */
6733 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6734 if (!apply_implicit_conversion(glsl_type::uint_type
,
6736 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6738 /* Conversion of the init-expression value. */
6739 if (!apply_implicit_conversion(glsl_type::uint_type
,
6740 deref_test_var
, state
))
6741 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6745 /* If the implicit conversion was allowed, the types will already be
6746 * the same. If the implicit conversion wasn't allowed, smash the
6747 * type of the label anyway. This will prevent the expression
6748 * constructor (below) from failing an assertion.
6750 label
->type
= deref_test_var
->type
;
6753 body
.emit(assign(fallthru_var
,
6754 logic_or(fallthru_var
, equal(label
, deref_test_var
))));
6755 } else { /* default case */
6756 if (state
->switch_state
.previous_default
) {
6757 YYLTYPE loc
= this->get_location();
6758 _mesa_glsl_error(& loc
, state
,
6759 "multiple default labels in one switch");
6761 loc
= state
->switch_state
.previous_default
->get_location();
6762 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6764 state
->switch_state
.previous_default
= this;
6766 /* Set fallthru condition on 'run_default' bool. */
6767 body
.emit(assign(fallthru_var
,
6768 logic_or(fallthru_var
,
6769 state
->switch_state
.run_default
)));
6772 /* Case statements do not have r-values. */
6777 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6778 struct _mesa_glsl_parse_state
*state
)
6782 if (condition
!= NULL
) {
6783 ir_rvalue
*const cond
=
6784 condition
->hir(instructions
, state
);
6787 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6788 YYLTYPE loc
= condition
->get_location();
6790 _mesa_glsl_error(& loc
, state
,
6791 "loop condition must be scalar boolean");
6793 /* As the first code in the loop body, generate a block that looks
6794 * like 'if (!condition) break;' as the loop termination condition.
6796 ir_rvalue
*const not_cond
=
6797 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6799 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6801 ir_jump
*const break_stmt
=
6802 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6804 if_stmt
->then_instructions
.push_tail(break_stmt
);
6805 instructions
->push_tail(if_stmt
);
6812 ast_iteration_statement::hir(exec_list
*instructions
,
6813 struct _mesa_glsl_parse_state
*state
)
6817 /* For-loops and while-loops start a new scope, but do-while loops do not.
6819 if (mode
!= ast_do_while
)
6820 state
->symbols
->push_scope();
6822 if (init_statement
!= NULL
)
6823 init_statement
->hir(instructions
, state
);
6825 ir_loop
*const stmt
= new(ctx
) ir_loop();
6826 instructions
->push_tail(stmt
);
6828 /* Track the current loop nesting. */
6829 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6831 state
->loop_nesting_ast
= this;
6833 /* Likewise, indicate that following code is closest to a loop,
6834 * NOT closest to a switch.
6836 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6837 state
->switch_state
.is_switch_innermost
= false;
6839 if (mode
!= ast_do_while
)
6840 condition_to_hir(&stmt
->body_instructions
, state
);
6843 body
->hir(& stmt
->body_instructions
, state
);
6845 if (rest_expression
!= NULL
)
6846 rest_expression
->hir(& stmt
->body_instructions
, state
);
6848 if (mode
== ast_do_while
)
6849 condition_to_hir(&stmt
->body_instructions
, state
);
6851 if (mode
!= ast_do_while
)
6852 state
->symbols
->pop_scope();
6854 /* Restore previous nesting before returning. */
6855 state
->loop_nesting_ast
= nesting_ast
;
6856 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6858 /* Loops do not have r-values.
6865 * Determine if the given type is valid for establishing a default precision
6868 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6870 * "The precision statement
6872 * precision precision-qualifier type;
6874 * can be used to establish a default precision qualifier. The type field
6875 * can be either int or float or any of the sampler types, and the
6876 * precision-qualifier can be lowp, mediump, or highp."
6878 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6879 * qualifiers on sampler types, but this seems like an oversight (since the
6880 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6881 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6885 is_valid_default_precision_type(const struct glsl_type
*const type
)
6890 switch (type
->base_type
) {
6892 case GLSL_TYPE_FLOAT
:
6893 /* "int" and "float" are valid, but vectors and matrices are not. */
6894 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6895 case GLSL_TYPE_SAMPLER
:
6896 case GLSL_TYPE_IMAGE
:
6897 case GLSL_TYPE_ATOMIC_UINT
:
6906 ast_type_specifier::hir(exec_list
*instructions
,
6907 struct _mesa_glsl_parse_state
*state
)
6909 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6912 YYLTYPE loc
= this->get_location();
6914 /* If this is a precision statement, check that the type to which it is
6915 * applied is either float or int.
6917 * From section 4.5.3 of the GLSL 1.30 spec:
6918 * "The precision statement
6919 * precision precision-qualifier type;
6920 * can be used to establish a default precision qualifier. The type
6921 * field can be either int or float [...]. Any other types or
6922 * qualifiers will result in an error.
6924 if (this->default_precision
!= ast_precision_none
) {
6925 if (!state
->check_precision_qualifiers_allowed(&loc
))
6928 if (this->structure
!= NULL
) {
6929 _mesa_glsl_error(&loc
, state
,
6930 "precision qualifiers do not apply to structures");
6934 if (this->array_specifier
!= NULL
) {
6935 _mesa_glsl_error(&loc
, state
,
6936 "default precision statements do not apply to "
6941 const struct glsl_type
*const type
=
6942 state
->symbols
->get_type(this->type_name
);
6943 if (!is_valid_default_precision_type(type
)) {
6944 _mesa_glsl_error(&loc
, state
,
6945 "default precision statements apply only to "
6946 "float, int, and opaque types");
6950 if (state
->es_shader
) {
6951 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6954 * "Non-precision qualified declarations will use the precision
6955 * qualifier specified in the most recent precision statement
6956 * that is still in scope. The precision statement has the same
6957 * scoping rules as variable declarations. If it is declared
6958 * inside a compound statement, its effect stops at the end of
6959 * the innermost statement it was declared in. Precision
6960 * statements in nested scopes override precision statements in
6961 * outer scopes. Multiple precision statements for the same basic
6962 * type can appear inside the same scope, with later statements
6963 * overriding earlier statements within that scope."
6965 * Default precision specifications follow the same scope rules as
6966 * variables. So, we can track the state of the default precision
6967 * qualifiers in the symbol table, and the rules will just work. This
6968 * is a slight abuse of the symbol table, but it has the semantics
6971 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6972 this->default_precision
);
6975 /* FINISHME: Translate precision statements into IR. */
6979 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6980 * process_record_constructor() can do type-checking on C-style initializer
6981 * expressions of structs, but ast_struct_specifier should only be translated
6982 * to HIR if it is declaring the type of a structure.
6984 * The ->is_declaration field is false for initializers of variables
6985 * declared separately from the struct's type definition.
6987 * struct S { ... }; (is_declaration = true)
6988 * struct T { ... } t = { ... }; (is_declaration = true)
6989 * S s = { ... }; (is_declaration = false)
6991 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6992 return this->structure
->hir(instructions
, state
);
6999 * Process a structure or interface block tree into an array of structure fields
7001 * After parsing, where there are some syntax differnces, structures and
7002 * interface blocks are almost identical. They are similar enough that the
7003 * AST for each can be processed the same way into a set of
7004 * \c glsl_struct_field to describe the members.
7006 * If we're processing an interface block, var_mode should be the type of the
7007 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
7008 * ir_var_shader_storage). If we're processing a structure, var_mode should be
7012 * The number of fields processed. A pointer to the array structure fields is
7013 * stored in \c *fields_ret.
7016 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
7017 struct _mesa_glsl_parse_state
*state
,
7018 exec_list
*declarations
,
7019 glsl_struct_field
**fields_ret
,
7021 enum glsl_matrix_layout matrix_layout
,
7022 bool allow_reserved_names
,
7023 ir_variable_mode var_mode
,
7024 ast_type_qualifier
*layout
,
7025 unsigned block_stream
,
7026 unsigned block_xfb_buffer
,
7027 unsigned block_xfb_offset
,
7028 unsigned expl_location
,
7029 unsigned expl_align
)
7031 unsigned decl_count
= 0;
7032 unsigned next_offset
= 0;
7034 /* Make an initial pass over the list of fields to determine how
7035 * many there are. Each element in this list is an ast_declarator_list.
7036 * This means that we actually need to count the number of elements in the
7037 * 'declarations' list in each of the elements.
7039 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7040 decl_count
+= decl_list
->declarations
.length();
7043 /* Allocate storage for the fields and process the field
7044 * declarations. As the declarations are processed, try to also convert
7045 * the types to HIR. This ensures that structure definitions embedded in
7046 * other structure definitions or in interface blocks are processed.
7048 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
7051 bool first_member
= true;
7052 bool first_member_has_explicit_location
= false;
7055 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7056 const char *type_name
;
7057 YYLTYPE loc
= decl_list
->get_location();
7059 decl_list
->type
->specifier
->hir(instructions
, state
);
7061 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
7063 * "Anonymous structures are not supported; so embedded structures
7064 * must have a declarator. A name given to an embedded struct is
7065 * scoped at the same level as the struct it is embedded in."
7067 * The same section of the GLSL 1.20 spec says:
7069 * "Anonymous structures are not supported. Embedded structures are
7072 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
7073 * embedded structures in 1.10 only.
7075 if (state
->language_version
!= 110 &&
7076 decl_list
->type
->specifier
->structure
!= NULL
)
7077 _mesa_glsl_error(&loc
, state
,
7078 "embedded structure declarations are not allowed");
7080 const glsl_type
*decl_type
=
7081 decl_list
->type
->glsl_type(& type_name
, state
);
7083 const struct ast_type_qualifier
*const qual
=
7084 &decl_list
->type
->qualifier
;
7086 /* From section 4.3.9 of the GLSL 4.40 spec:
7088 * "[In interface blocks] opaque types are not allowed."
7090 * It should be impossible for decl_type to be NULL here. Cases that
7091 * might naturally lead to decl_type being NULL, especially for the
7092 * is_interface case, will have resulted in compilation having
7093 * already halted due to a syntax error.
7098 /* From section 4.3.7 of the ARB_bindless_texture spec:
7100 * "(remove the following bullet from the last list on p. 39,
7101 * thereby permitting sampler types in interface blocks; image
7102 * types are also permitted in blocks by this extension)"
7104 * * sampler types are not allowed
7106 if (decl_type
->contains_atomic() ||
7107 (!state
->has_bindless() && decl_type
->contains_opaque())) {
7108 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
7109 "interface block contains %s variable",
7110 state
->has_bindless() ? "atomic" : "opaque");
7113 if (decl_type
->contains_atomic()) {
7114 /* From section 4.1.7.3 of the GLSL 4.40 spec:
7116 * "Members of structures cannot be declared as atomic counter
7119 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
7122 if (!state
->has_bindless() && decl_type
->contains_image()) {
7123 /* FINISHME: Same problem as with atomic counters.
7124 * FINISHME: Request clarification from Khronos and add
7125 * FINISHME: spec quotation here.
7127 _mesa_glsl_error(&loc
, state
, "image in structure");
7131 if (qual
->flags
.q
.explicit_binding
) {
7132 _mesa_glsl_error(&loc
, state
,
7133 "binding layout qualifier cannot be applied "
7134 "to struct or interface block members");
7138 if (!first_member
) {
7139 if (!layout
->flags
.q
.explicit_location
&&
7140 ((first_member_has_explicit_location
&&
7141 !qual
->flags
.q
.explicit_location
) ||
7142 (!first_member_has_explicit_location
&&
7143 qual
->flags
.q
.explicit_location
))) {
7144 _mesa_glsl_error(&loc
, state
,
7145 "when block-level location layout qualifier "
7146 "is not supplied either all members must "
7147 "have a location layout qualifier or all "
7148 "members must not have a location layout "
7152 first_member
= false;
7153 first_member_has_explicit_location
=
7154 qual
->flags
.q
.explicit_location
;
7158 if (qual
->flags
.q
.std140
||
7159 qual
->flags
.q
.std430
||
7160 qual
->flags
.q
.packed
||
7161 qual
->flags
.q
.shared
) {
7162 _mesa_glsl_error(&loc
, state
,
7163 "uniform/shader storage block layout qualifiers "
7164 "std140, std430, packed, and shared can only be "
7165 "applied to uniform/shader storage blocks, not "
7169 if (qual
->flags
.q
.constant
) {
7170 _mesa_glsl_error(&loc
, state
,
7171 "const storage qualifier cannot be applied "
7172 "to struct or interface block members");
7175 validate_memory_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7176 validate_image_format_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7178 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
7180 * "A block member may be declared with a stream identifier, but
7181 * the specified stream must match the stream associated with the
7182 * containing block."
7184 if (qual
->flags
.q
.explicit_stream
) {
7185 unsigned qual_stream
;
7186 if (process_qualifier_constant(state
, &loc
, "stream",
7187 qual
->stream
, &qual_stream
) &&
7188 qual_stream
!= block_stream
) {
7189 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
7190 "interface block member does not match "
7191 "the interface block (%u vs %u)", qual_stream
,
7197 unsigned explicit_xfb_buffer
= 0;
7198 if (qual
->flags
.q
.explicit_xfb_buffer
) {
7199 unsigned qual_xfb_buffer
;
7200 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
7201 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
7202 explicit_xfb_buffer
= 1;
7203 if (qual_xfb_buffer
!= block_xfb_buffer
)
7204 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
7205 "interface block member does not match "
7206 "the interface block (%u vs %u)",
7207 qual_xfb_buffer
, block_xfb_buffer
);
7209 xfb_buffer
= (int) qual_xfb_buffer
;
7212 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
7213 xfb_buffer
= (int) block_xfb_buffer
;
7216 int xfb_stride
= -1;
7217 if (qual
->flags
.q
.explicit_xfb_stride
) {
7218 unsigned qual_xfb_stride
;
7219 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
7220 qual
->xfb_stride
, &qual_xfb_stride
)) {
7221 xfb_stride
= (int) qual_xfb_stride
;
7225 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
7226 _mesa_glsl_error(&loc
, state
,
7227 "interpolation qualifiers cannot be used "
7228 "with uniform interface blocks");
7231 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
7232 qual
->has_auxiliary_storage()) {
7233 _mesa_glsl_error(&loc
, state
,
7234 "auxiliary storage qualifiers cannot be used "
7235 "in uniform blocks or structures.");
7238 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
7239 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
7240 _mesa_glsl_error(&loc
, state
,
7241 "row_major and column_major can only be "
7242 "applied to interface blocks");
7244 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
7247 foreach_list_typed (ast_declaration
, decl
, link
,
7248 &decl_list
->declarations
) {
7249 YYLTYPE loc
= decl
->get_location();
7251 if (!allow_reserved_names
)
7252 validate_identifier(decl
->identifier
, loc
, state
);
7254 const struct glsl_type
*field_type
=
7255 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
7256 validate_array_dimensions(field_type
, state
, &loc
);
7257 fields
[i
].type
= field_type
;
7258 fields
[i
].name
= decl
->identifier
;
7259 fields
[i
].interpolation
=
7260 interpret_interpolation_qualifier(qual
, field_type
,
7261 var_mode
, state
, &loc
);
7262 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
7263 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
7264 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
7265 fields
[i
].precision
= qual
->precision
;
7266 fields
[i
].offset
= -1;
7267 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
7268 fields
[i
].xfb_buffer
= xfb_buffer
;
7269 fields
[i
].xfb_stride
= xfb_stride
;
7271 if (qual
->flags
.q
.explicit_location
) {
7272 unsigned qual_location
;
7273 if (process_qualifier_constant(state
, &loc
, "location",
7274 qual
->location
, &qual_location
)) {
7275 fields
[i
].location
= qual_location
+
7276 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
7277 expl_location
= fields
[i
].location
+
7278 fields
[i
].type
->count_attribute_slots(false);
7281 if (layout
&& layout
->flags
.q
.explicit_location
) {
7282 fields
[i
].location
= expl_location
;
7283 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
7285 fields
[i
].location
= -1;
7289 /* Offset can only be used with std430 and std140 layouts an initial
7290 * value of 0 is used for error detection.
7296 if (qual
->flags
.q
.row_major
||
7297 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7303 if(layout
->flags
.q
.std140
) {
7304 align
= field_type
->std140_base_alignment(row_major
);
7305 size
= field_type
->std140_size(row_major
);
7306 } else if (layout
->flags
.q
.std430
) {
7307 align
= field_type
->std430_base_alignment(row_major
);
7308 size
= field_type
->std430_size(row_major
);
7312 if (qual
->flags
.q
.explicit_offset
) {
7313 unsigned qual_offset
;
7314 if (process_qualifier_constant(state
, &loc
, "offset",
7315 qual
->offset
, &qual_offset
)) {
7316 if (align
!= 0 && size
!= 0) {
7317 if (next_offset
> qual_offset
)
7318 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7319 "offset overlaps previous member");
7321 if (qual_offset
% align
) {
7322 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7323 "must be a multiple of the base "
7324 "alignment of %s", field_type
->name
);
7326 fields
[i
].offset
= qual_offset
;
7327 next_offset
= glsl_align(qual_offset
+ size
, align
);
7329 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7330 "with std430 and std140 layouts");
7335 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7336 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7338 if (align
== 0 || size
== 0) {
7339 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7340 "std430 and std140 layouts");
7341 } else if (qual
->flags
.q
.explicit_align
) {
7342 unsigned member_align
;
7343 if (process_qualifier_constant(state
, &loc
, "align",
7344 qual
->align
, &member_align
)) {
7345 if (member_align
== 0 ||
7346 member_align
& (member_align
- 1)) {
7347 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7348 "in not a power of 2");
7350 fields
[i
].offset
= glsl_align(offset
, member_align
);
7351 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7355 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7356 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7358 } else if (!qual
->flags
.q
.explicit_offset
) {
7359 if (align
!= 0 && size
!= 0)
7360 next_offset
= glsl_align(next_offset
+ size
, align
);
7363 /* From the ARB_enhanced_layouts spec:
7365 * "The given offset applies to the first component of the first
7366 * member of the qualified entity. Then, within the qualified
7367 * entity, subsequent components are each assigned, in order, to
7368 * the next available offset aligned to a multiple of that
7369 * component's size. Aggregate types are flattened down to the
7370 * component level to get this sequence of components."
7372 if (qual
->flags
.q
.explicit_xfb_offset
) {
7373 unsigned xfb_offset
;
7374 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7375 qual
->offset
, &xfb_offset
)) {
7376 fields
[i
].offset
= xfb_offset
;
7377 block_xfb_offset
= fields
[i
].offset
+
7378 4 * field_type
->component_slots();
7381 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7382 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7383 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7384 block_xfb_offset
+= 4 * field_type
->component_slots();
7388 /* Propogate row- / column-major information down the fields of the
7389 * structure or interface block. Structures need this data because
7390 * the structure may contain a structure that contains ... a matrix
7391 * that need the proper layout.
7393 if (is_interface
&& layout
&&
7394 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7395 (field_type
->without_array()->is_matrix()
7396 || field_type
->without_array()->is_record())) {
7397 /* If no layout is specified for the field, inherit the layout
7400 fields
[i
].matrix_layout
= matrix_layout
;
7402 if (qual
->flags
.q
.row_major
)
7403 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7404 else if (qual
->flags
.q
.column_major
)
7405 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7407 /* If we're processing an uniform or buffer block, the matrix
7408 * layout must be decided by this point.
7410 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7411 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7414 /* Memory qualifiers are allowed on buffer and image variables, while
7415 * the format qualifier is only accepted for images.
7417 if (var_mode
== ir_var_shader_storage
||
7418 field_type
->without_array()->is_image()) {
7419 /* For readonly and writeonly qualifiers the field definition,
7420 * if set, overwrites the layout qualifier.
7422 if (qual
->flags
.q
.read_only
|| qual
->flags
.q
.write_only
) {
7423 fields
[i
].memory_read_only
= qual
->flags
.q
.read_only
;
7424 fields
[i
].memory_write_only
= qual
->flags
.q
.write_only
;
7426 fields
[i
].memory_read_only
=
7427 layout
? layout
->flags
.q
.read_only
: 0;
7428 fields
[i
].memory_write_only
=
7429 layout
? layout
->flags
.q
.write_only
: 0;
7432 /* For other qualifiers, we set the flag if either the layout
7433 * qualifier or the field qualifier are set
7435 fields
[i
].memory_coherent
= qual
->flags
.q
.coherent
||
7436 (layout
&& layout
->flags
.q
.coherent
);
7437 fields
[i
].memory_volatile
= qual
->flags
.q
._volatile
||
7438 (layout
&& layout
->flags
.q
._volatile
);
7439 fields
[i
].memory_restrict
= qual
->flags
.q
.restrict_flag
||
7440 (layout
&& layout
->flags
.q
.restrict_flag
);
7442 if (field_type
->without_array()->is_image()) {
7443 if (qual
->flags
.q
.explicit_image_format
) {
7444 if (qual
->image_base_type
!=
7445 field_type
->without_array()->sampled_type
) {
7446 _mesa_glsl_error(&loc
, state
, "format qualifier doesn't "
7447 "match the base data type of the image");
7450 fields
[i
].image_format
= qual
->image_format
;
7452 if (!qual
->flags
.q
.write_only
) {
7453 _mesa_glsl_error(&loc
, state
, "image not qualified with "
7454 "`writeonly' must have a format layout "
7458 fields
[i
].image_format
= GL_NONE
;
7467 assert(i
== decl_count
);
7469 *fields_ret
= fields
;
7475 ast_struct_specifier::hir(exec_list
*instructions
,
7476 struct _mesa_glsl_parse_state
*state
)
7478 YYLTYPE loc
= this->get_location();
7480 unsigned expl_location
= 0;
7481 if (layout
&& layout
->flags
.q
.explicit_location
) {
7482 if (!process_qualifier_constant(state
, &loc
, "location",
7483 layout
->location
, &expl_location
)) {
7486 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7490 glsl_struct_field
*fields
;
7491 unsigned decl_count
=
7492 ast_process_struct_or_iface_block_members(instructions
,
7494 &this->declarations
,
7497 GLSL_MATRIX_LAYOUT_INHERITED
,
7498 false /* allow_reserved_names */,
7501 0, /* for interface only */
7502 0, /* for interface only */
7503 0, /* for interface only */
7505 0 /* for interface only */);
7507 validate_identifier(this->name
, loc
, state
);
7509 type
= glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7511 if (!type
->is_anonymous() && !state
->symbols
->add_type(name
, type
)) {
7512 const glsl_type
*match
= state
->symbols
->get_type(name
);
7513 /* allow struct matching for desktop GL - older UE4 does this */
7514 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(type
, false))
7515 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7517 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7519 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7521 state
->num_user_structures
+ 1);
7523 s
[state
->num_user_structures
] = type
;
7524 state
->user_structures
= s
;
7525 state
->num_user_structures
++;
7529 /* Structure type definitions do not have r-values.
7536 * Visitor class which detects whether a given interface block has been used.
7538 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7541 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7542 : mode(mode
), block(block
), found(false)
7546 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7548 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7552 return visit_continue
;
7555 bool usage_found() const
7561 ir_variable_mode mode
;
7562 const glsl_type
*block
;
7567 is_unsized_array_last_element(ir_variable
*v
)
7569 const glsl_type
*interface_type
= v
->get_interface_type();
7570 int length
= interface_type
->length
;
7572 assert(v
->type
->is_unsized_array());
7574 /* Check if it is the last element of the interface */
7575 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7581 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7583 var
->data
.memory_read_only
= field
.memory_read_only
;
7584 var
->data
.memory_write_only
= field
.memory_write_only
;
7585 var
->data
.memory_coherent
= field
.memory_coherent
;
7586 var
->data
.memory_volatile
= field
.memory_volatile
;
7587 var
->data
.memory_restrict
= field
.memory_restrict
;
7591 ast_interface_block::hir(exec_list
*instructions
,
7592 struct _mesa_glsl_parse_state
*state
)
7594 YYLTYPE loc
= this->get_location();
7596 /* Interface blocks must be declared at global scope */
7597 if (state
->current_function
!= NULL
) {
7598 _mesa_glsl_error(&loc
, state
,
7599 "Interface block `%s' must be declared "
7604 /* Validate qualifiers:
7606 * - Layout Qualifiers as per the table in Section 4.4
7607 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7609 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7612 * "Additionally, memory qualifiers may also be used in the declaration
7613 * of shader storage blocks"
7615 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7616 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7617 * Layout Qualifiers) of the GLSL 4.50 spec says:
7619 * "The std430 qualifier is supported only for shader storage blocks;
7620 * using std430 on a uniform block will result in a compile-time error."
7622 ast_type_qualifier allowed_blk_qualifiers
;
7623 allowed_blk_qualifiers
.flags
.i
= 0;
7624 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7625 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7626 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7627 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7628 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7629 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7630 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7631 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7632 if (this->layout
.flags
.q
.buffer
) {
7633 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7634 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7635 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7636 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7637 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7638 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7639 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7641 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7644 /* Interface block */
7645 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7647 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7648 if (this->layout
.flags
.q
.out
) {
7649 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7650 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7651 state
->stage
== MESA_SHADER_TESS_CTRL
||
7652 state
->stage
== MESA_SHADER_TESS_EVAL
||
7653 state
->stage
== MESA_SHADER_VERTEX
) {
7654 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7655 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7656 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7657 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7658 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7659 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7660 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7661 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7663 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7664 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7668 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7669 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7670 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7675 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7676 "invalid qualifier for block",
7679 enum glsl_interface_packing packing
;
7680 if (this->layout
.flags
.q
.std140
) {
7681 packing
= GLSL_INTERFACE_PACKING_STD140
;
7682 } else if (this->layout
.flags
.q
.packed
) {
7683 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7684 } else if (this->layout
.flags
.q
.std430
) {
7685 packing
= GLSL_INTERFACE_PACKING_STD430
;
7687 /* The default layout is shared.
7689 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7692 ir_variable_mode var_mode
;
7693 const char *iface_type_name
;
7694 if (this->layout
.flags
.q
.in
) {
7695 var_mode
= ir_var_shader_in
;
7696 iface_type_name
= "in";
7697 } else if (this->layout
.flags
.q
.out
) {
7698 var_mode
= ir_var_shader_out
;
7699 iface_type_name
= "out";
7700 } else if (this->layout
.flags
.q
.uniform
) {
7701 var_mode
= ir_var_uniform
;
7702 iface_type_name
= "uniform";
7703 } else if (this->layout
.flags
.q
.buffer
) {
7704 var_mode
= ir_var_shader_storage
;
7705 iface_type_name
= "buffer";
7707 var_mode
= ir_var_auto
;
7708 iface_type_name
= "UNKNOWN";
7709 assert(!"interface block layout qualifier not found!");
7712 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7713 if (this->layout
.flags
.q
.row_major
)
7714 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7715 else if (this->layout
.flags
.q
.column_major
)
7716 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7718 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7719 exec_list declared_variables
;
7720 glsl_struct_field
*fields
;
7722 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7723 * that we don't have incompatible qualifiers
7725 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7726 _mesa_glsl_error(&loc
, state
,
7727 "Interface block sets both readonly and writeonly");
7730 unsigned qual_stream
;
7731 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7733 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7734 /* If the stream qualifier is invalid it doesn't make sense to continue
7735 * on and try to compare stream layouts on member variables against it
7736 * so just return early.
7741 unsigned qual_xfb_buffer
;
7742 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7743 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7744 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7748 unsigned qual_xfb_offset
;
7749 if (layout
.flags
.q
.explicit_xfb_offset
) {
7750 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7751 layout
.offset
, &qual_xfb_offset
)) {
7756 unsigned qual_xfb_stride
;
7757 if (layout
.flags
.q
.explicit_xfb_stride
) {
7758 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7759 layout
.xfb_stride
, &qual_xfb_stride
)) {
7764 unsigned expl_location
= 0;
7765 if (layout
.flags
.q
.explicit_location
) {
7766 if (!process_qualifier_constant(state
, &loc
, "location",
7767 layout
.location
, &expl_location
)) {
7770 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7771 : VARYING_SLOT_VAR0
;
7775 unsigned expl_align
= 0;
7776 if (layout
.flags
.q
.explicit_align
) {
7777 if (!process_qualifier_constant(state
, &loc
, "align",
7778 layout
.align
, &expl_align
)) {
7781 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7782 _mesa_glsl_error(&loc
, state
, "align layout qualifier is not a "
7789 unsigned int num_variables
=
7790 ast_process_struct_or_iface_block_members(&declared_variables
,
7792 &this->declarations
,
7796 redeclaring_per_vertex
,
7805 if (!redeclaring_per_vertex
) {
7806 validate_identifier(this->block_name
, loc
, state
);
7808 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7810 * "Block names have no other use within a shader beyond interface
7811 * matching; it is a compile-time error to use a block name at global
7812 * scope for anything other than as a block name."
7814 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7815 if (var
&& !var
->type
->is_interface()) {
7816 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7817 "already used in the scope.",
7822 const glsl_type
*earlier_per_vertex
= NULL
;
7823 if (redeclaring_per_vertex
) {
7824 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7825 * the named interface block gl_in, we can find it by looking at the
7826 * previous declaration of gl_in. Otherwise we can find it by looking
7827 * at the previous decalartion of any of the built-in outputs,
7830 * Also check that the instance name and array-ness of the redeclaration
7834 case ir_var_shader_in
:
7835 if (ir_variable
*earlier_gl_in
=
7836 state
->symbols
->get_variable("gl_in")) {
7837 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7839 _mesa_glsl_error(&loc
, state
,
7840 "redeclaration of gl_PerVertex input not allowed "
7842 _mesa_shader_stage_to_string(state
->stage
));
7844 if (this->instance_name
== NULL
||
7845 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7846 !this->array_specifier
->is_single_dimension()) {
7847 _mesa_glsl_error(&loc
, state
,
7848 "gl_PerVertex input must be redeclared as "
7852 case ir_var_shader_out
:
7853 if (ir_variable
*earlier_gl_Position
=
7854 state
->symbols
->get_variable("gl_Position")) {
7855 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7856 } else if (ir_variable
*earlier_gl_out
=
7857 state
->symbols
->get_variable("gl_out")) {
7858 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7860 _mesa_glsl_error(&loc
, state
,
7861 "redeclaration of gl_PerVertex output not "
7862 "allowed in the %s shader",
7863 _mesa_shader_stage_to_string(state
->stage
));
7865 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7866 if (this->instance_name
== NULL
||
7867 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7868 _mesa_glsl_error(&loc
, state
,
7869 "gl_PerVertex output must be redeclared as "
7873 if (this->instance_name
!= NULL
) {
7874 _mesa_glsl_error(&loc
, state
,
7875 "gl_PerVertex output may not be redeclared with "
7876 "an instance name");
7881 _mesa_glsl_error(&loc
, state
,
7882 "gl_PerVertex must be declared as an input or an "
7887 if (earlier_per_vertex
== NULL
) {
7888 /* An error has already been reported. Bail out to avoid null
7889 * dereferences later in this function.
7894 /* Copy locations from the old gl_PerVertex interface block. */
7895 for (unsigned i
= 0; i
< num_variables
; i
++) {
7896 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7898 _mesa_glsl_error(&loc
, state
,
7899 "redeclaration of gl_PerVertex must be a subset "
7900 "of the built-in members of gl_PerVertex");
7902 fields
[i
].location
=
7903 earlier_per_vertex
->fields
.structure
[j
].location
;
7905 earlier_per_vertex
->fields
.structure
[j
].offset
;
7906 fields
[i
].interpolation
=
7907 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7908 fields
[i
].centroid
=
7909 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7911 earlier_per_vertex
->fields
.structure
[j
].sample
;
7913 earlier_per_vertex
->fields
.structure
[j
].patch
;
7914 fields
[i
].precision
=
7915 earlier_per_vertex
->fields
.structure
[j
].precision
;
7916 fields
[i
].explicit_xfb_buffer
=
7917 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7918 fields
[i
].xfb_buffer
=
7919 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7920 fields
[i
].xfb_stride
=
7921 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7925 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7928 * If a built-in interface block is redeclared, it must appear in
7929 * the shader before any use of any member included in the built-in
7930 * declaration, or a compilation error will result.
7932 * This appears to be a clarification to the behaviour established for
7933 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7934 * regardless of GLSL version.
7936 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7937 v
.run(instructions
);
7938 if (v
.usage_found()) {
7939 _mesa_glsl_error(&loc
, state
,
7940 "redeclaration of a built-in interface block must "
7941 "appear before any use of any member of the "
7946 const glsl_type
*block_type
=
7947 glsl_type::get_interface_instance(fields
,
7951 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7954 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7956 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7957 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7960 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7961 YYLTYPE loc
= this->get_location();
7962 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7963 "already taken in the current scope",
7964 this->block_name
, iface_type_name
);
7967 /* Since interface blocks cannot contain statements, it should be
7968 * impossible for the block to generate any instructions.
7970 assert(declared_variables
.is_empty());
7972 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7974 * Geometry shader input variables get the per-vertex values written
7975 * out by vertex shader output variables of the same names. Since a
7976 * geometry shader operates on a set of vertices, each input varying
7977 * variable (or input block, see interface blocks below) needs to be
7978 * declared as an array.
7980 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7981 var_mode
== ir_var_shader_in
) {
7982 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7983 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7984 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7985 !this->layout
.flags
.q
.patch
&&
7986 this->array_specifier
== NULL
&&
7987 var_mode
== ir_var_shader_in
) {
7988 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7989 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7990 !this->layout
.flags
.q
.patch
&&
7991 this->array_specifier
== NULL
&&
7992 var_mode
== ir_var_shader_out
) {
7993 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7997 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
8000 * "If an instance name (instance-name) is used, then it puts all the
8001 * members inside a scope within its own name space, accessed with the
8002 * field selector ( . ) operator (analogously to structures)."
8004 if (this->instance_name
) {
8005 if (redeclaring_per_vertex
) {
8006 /* When a built-in in an unnamed interface block is redeclared,
8007 * get_variable_being_redeclared() calls
8008 * check_builtin_array_max_size() to make sure that built-in array
8009 * variables aren't redeclared to illegal sizes. But we're looking
8010 * at a redeclaration of a named built-in interface block. So we
8011 * have to manually call check_builtin_array_max_size() for all parts
8012 * of the interface that are arrays.
8014 for (unsigned i
= 0; i
< num_variables
; i
++) {
8015 if (fields
[i
].type
->is_array()) {
8016 const unsigned size
= fields
[i
].type
->array_size();
8017 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
8021 validate_identifier(this->instance_name
, loc
, state
);
8026 if (this->array_specifier
!= NULL
) {
8027 const glsl_type
*block_array_type
=
8028 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
8030 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
8032 * For uniform blocks declared an array, each individual array
8033 * element corresponds to a separate buffer object backing one
8034 * instance of the block. As the array size indicates the number
8035 * of buffer objects needed, uniform block array declarations
8036 * must specify an array size.
8038 * And a few paragraphs later:
8040 * Geometry shader input blocks must be declared as arrays and
8041 * follow the array declaration and linking rules for all
8042 * geometry shader inputs. All other input and output block
8043 * arrays must specify an array size.
8045 * The same applies to tessellation shaders.
8047 * The upshot of this is that the only circumstance where an
8048 * interface array size *doesn't* need to be specified is on a
8049 * geometry shader input, tessellation control shader input,
8050 * tessellation control shader output, and tessellation evaluation
8053 if (block_array_type
->is_unsized_array()) {
8054 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
8055 state
->stage
== MESA_SHADER_TESS_CTRL
||
8056 state
->stage
== MESA_SHADER_TESS_EVAL
;
8057 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
8059 if (this->layout
.flags
.q
.in
) {
8061 _mesa_glsl_error(&loc
, state
,
8062 "unsized input block arrays not allowed in "
8064 _mesa_shader_stage_to_string(state
->stage
));
8065 } else if (this->layout
.flags
.q
.out
) {
8067 _mesa_glsl_error(&loc
, state
,
8068 "unsized output block arrays not allowed in "
8070 _mesa_shader_stage_to_string(state
->stage
));
8072 /* by elimination, this is a uniform block array */
8073 _mesa_glsl_error(&loc
, state
,
8074 "unsized uniform block arrays not allowed in "
8076 _mesa_shader_stage_to_string(state
->stage
));
8080 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
8082 * * Arrays of arrays of blocks are not allowed
8084 if (state
->es_shader
&& block_array_type
->is_array() &&
8085 block_array_type
->fields
.array
->is_array()) {
8086 _mesa_glsl_error(&loc
, state
,
8087 "arrays of arrays interface blocks are "
8091 var
= new(state
) ir_variable(block_array_type
,
8092 this->instance_name
,
8095 var
= new(state
) ir_variable(block_type
,
8096 this->instance_name
,
8100 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8101 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8103 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8104 var
->data
.read_only
= true;
8106 var
->data
.patch
= this->layout
.flags
.q
.patch
;
8108 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
8109 handle_geometry_shader_input_decl(state
, loc
, var
);
8110 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8111 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
8112 handle_tess_shader_input_decl(state
, loc
, var
);
8113 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
8114 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
8116 for (unsigned i
= 0; i
< num_variables
; i
++) {
8117 if (var
->data
.mode
== ir_var_shader_storage
)
8118 apply_memory_qualifiers(var
, fields
[i
]);
8121 if (ir_variable
*earlier
=
8122 state
->symbols
->get_variable(this->instance_name
)) {
8123 if (!redeclaring_per_vertex
) {
8124 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
8125 this->instance_name
);
8127 earlier
->data
.how_declared
= ir_var_declared_normally
;
8128 earlier
->type
= var
->type
;
8129 earlier
->reinit_interface_type(block_type
);
8132 if (this->layout
.flags
.q
.explicit_binding
) {
8133 apply_explicit_binding(state
, &loc
, var
, var
->type
,
8137 var
->data
.stream
= qual_stream
;
8138 if (layout
.flags
.q
.explicit_location
) {
8139 var
->data
.location
= expl_location
;
8140 var
->data
.explicit_location
= true;
8143 state
->symbols
->add_variable(var
);
8144 instructions
->push_tail(var
);
8147 /* In order to have an array size, the block must also be declared with
8150 assert(this->array_specifier
== NULL
);
8152 for (unsigned i
= 0; i
< num_variables
; i
++) {
8154 new(state
) ir_variable(fields
[i
].type
,
8155 ralloc_strdup(state
, fields
[i
].name
),
8157 var
->data
.interpolation
= fields
[i
].interpolation
;
8158 var
->data
.centroid
= fields
[i
].centroid
;
8159 var
->data
.sample
= fields
[i
].sample
;
8160 var
->data
.patch
= fields
[i
].patch
;
8161 var
->data
.stream
= qual_stream
;
8162 var
->data
.location
= fields
[i
].location
;
8164 if (fields
[i
].location
!= -1)
8165 var
->data
.explicit_location
= true;
8167 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
8168 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
8170 if (fields
[i
].offset
!= -1)
8171 var
->data
.explicit_xfb_offset
= true;
8172 var
->data
.offset
= fields
[i
].offset
;
8174 var
->init_interface_type(block_type
);
8176 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8177 var
->data
.read_only
= true;
8179 /* Precision qualifiers do not have any meaning in Desktop GLSL */
8180 if (state
->es_shader
) {
8181 var
->data
.precision
=
8182 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
8186 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
8187 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8188 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8190 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
8193 if (var
->data
.mode
== ir_var_shader_storage
)
8194 apply_memory_qualifiers(var
, fields
[i
]);
8196 /* Examine var name here since var may get deleted in the next call */
8197 bool var_is_gl_id
= is_gl_identifier(var
->name
);
8199 if (redeclaring_per_vertex
) {
8200 bool is_redeclaration
;
8202 get_variable_being_redeclared(&var
, loc
, state
,
8203 true /* allow_all_redeclarations */,
8205 if (!var_is_gl_id
|| !is_redeclaration
) {
8206 _mesa_glsl_error(&loc
, state
,
8207 "redeclaration of gl_PerVertex can only "
8208 "include built-in variables");
8209 } else if (var
->data
.how_declared
== ir_var_declared_normally
) {
8210 _mesa_glsl_error(&loc
, state
,
8211 "`%s' has already been redeclared",
8214 var
->data
.how_declared
= ir_var_declared_in_block
;
8215 var
->reinit_interface_type(block_type
);
8220 if (state
->symbols
->get_variable(var
->name
) != NULL
)
8221 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
8223 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
8224 * The UBO declaration itself doesn't get an ir_variable unless it
8225 * has an instance name. This is ugly.
8227 if (this->layout
.flags
.q
.explicit_binding
) {
8228 apply_explicit_binding(state
, &loc
, var
,
8229 var
->get_interface_type(), &this->layout
);
8232 if (var
->type
->is_unsized_array()) {
8233 if (var
->is_in_shader_storage_block() &&
8234 is_unsized_array_last_element(var
)) {
8235 var
->data
.from_ssbo_unsized_array
= true;
8237 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
8239 * "If an array is declared as the last member of a shader storage
8240 * block and the size is not specified at compile-time, it is
8241 * sized at run-time. In all other cases, arrays are sized only
8244 * In desktop GLSL it is allowed to have unsized-arrays that are
8245 * not last, as long as we can determine that they are implicitly
8248 if (state
->es_shader
) {
8249 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
8250 "definition: only last member of a shader "
8251 "storage block can be defined as unsized "
8252 "array", fields
[i
].name
);
8257 state
->symbols
->add_variable(var
);
8258 instructions
->push_tail(var
);
8261 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
8262 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
8264 * It is also a compilation error ... to redeclare a built-in
8265 * block and then use a member from that built-in block that was
8266 * not included in the redeclaration.
8268 * This appears to be a clarification to the behaviour established
8269 * for gl_PerVertex by GLSL 1.50, therefore we implement this
8270 * behaviour regardless of GLSL version.
8272 * To prevent the shader from using a member that was not included in
8273 * the redeclaration, we disable any ir_variables that are still
8274 * associated with the old declaration of gl_PerVertex (since we've
8275 * already updated all of the variables contained in the new
8276 * gl_PerVertex to point to it).
8278 * As a side effect this will prevent
8279 * validate_intrastage_interface_blocks() from getting confused and
8280 * thinking there are conflicting definitions of gl_PerVertex in the
8283 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8284 ir_variable
*const var
= node
->as_variable();
8286 var
->get_interface_type() == earlier_per_vertex
&&
8287 var
->data
.mode
== var_mode
) {
8288 if (var
->data
.how_declared
== ir_var_declared_normally
) {
8289 _mesa_glsl_error(&loc
, state
,
8290 "redeclaration of gl_PerVertex cannot "
8291 "follow a redeclaration of `%s'",
8294 state
->symbols
->disable_variable(var
->name
);
8306 ast_tcs_output_layout::hir(exec_list
*instructions
,
8307 struct _mesa_glsl_parse_state
*state
)
8309 YYLTYPE loc
= this->get_location();
8311 unsigned num_vertices
;
8312 if (!state
->out_qualifier
->vertices
->
8313 process_qualifier_constant(state
, "vertices", &num_vertices
,
8315 /* return here to stop cascading incorrect error messages */
8319 /* If any shader outputs occurred before this declaration and specified an
8320 * array size, make sure the size they specified is consistent with the
8323 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8324 _mesa_glsl_error(&loc
, state
,
8325 "this tessellation control shader output layout "
8326 "specifies %u vertices, but a previous output "
8327 "is declared with size %u",
8328 num_vertices
, state
->tcs_output_size
);
8332 state
->tcs_output_vertices_specified
= true;
8334 /* If any shader outputs occurred before this declaration and did not
8335 * specify an array size, their size is determined now.
8337 foreach_in_list (ir_instruction
, node
, instructions
) {
8338 ir_variable
*var
= node
->as_variable();
8339 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8342 /* Note: Not all tessellation control shader output are arrays. */
8343 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8346 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8347 _mesa_glsl_error(&loc
, state
,
8348 "this tessellation control shader output layout "
8349 "specifies %u vertices, but an access to element "
8350 "%u of output `%s' already exists", num_vertices
,
8351 var
->data
.max_array_access
, var
->name
);
8353 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8363 ast_gs_input_layout::hir(exec_list
*instructions
,
8364 struct _mesa_glsl_parse_state
*state
)
8366 YYLTYPE loc
= this->get_location();
8368 /* Should have been prevented by the parser. */
8369 assert(!state
->gs_input_prim_type_specified
8370 || state
->in_qualifier
->prim_type
== this->prim_type
);
8372 /* If any shader inputs occurred before this declaration and specified an
8373 * array size, make sure the size they specified is consistent with the
8376 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8377 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8378 _mesa_glsl_error(&loc
, state
,
8379 "this geometry shader input layout implies %u vertices"
8380 " per primitive, but a previous input is declared"
8381 " with size %u", num_vertices
, state
->gs_input_size
);
8385 state
->gs_input_prim_type_specified
= true;
8387 /* If any shader inputs occurred before this declaration and did not
8388 * specify an array size, their size is determined now.
8390 foreach_in_list(ir_instruction
, node
, instructions
) {
8391 ir_variable
*var
= node
->as_variable();
8392 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8395 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8399 if (var
->type
->is_unsized_array()) {
8400 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8401 _mesa_glsl_error(&loc
, state
,
8402 "this geometry shader input layout implies %u"
8403 " vertices, but an access to element %u of input"
8404 " `%s' already exists", num_vertices
,
8405 var
->data
.max_array_access
, var
->name
);
8407 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8418 ast_cs_input_layout::hir(exec_list
*instructions
,
8419 struct _mesa_glsl_parse_state
*state
)
8421 YYLTYPE loc
= this->get_location();
8423 /* From the ARB_compute_shader specification:
8425 * If the local size of the shader in any dimension is greater
8426 * than the maximum size supported by the implementation for that
8427 * dimension, a compile-time error results.
8429 * It is not clear from the spec how the error should be reported if
8430 * the total size of the work group exceeds
8431 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8432 * report it at compile time as well.
8434 GLuint64 total_invocations
= 1;
8435 unsigned qual_local_size
[3];
8436 for (int i
= 0; i
< 3; i
++) {
8438 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8440 /* Infer a local_size of 1 for unspecified dimensions */
8441 if (this->local_size
[i
] == NULL
) {
8442 qual_local_size
[i
] = 1;
8443 } else if (!this->local_size
[i
]->
8444 process_qualifier_constant(state
, local_size_str
,
8445 &qual_local_size
[i
], false)) {
8446 ralloc_free(local_size_str
);
8449 ralloc_free(local_size_str
);
8451 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8452 _mesa_glsl_error(&loc
, state
,
8453 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8455 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8458 total_invocations
*= qual_local_size
[i
];
8459 if (total_invocations
>
8460 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8461 _mesa_glsl_error(&loc
, state
,
8462 "product of local_sizes exceeds "
8463 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8464 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8469 /* If any compute input layout declaration preceded this one, make sure it
8470 * was consistent with this one.
8472 if (state
->cs_input_local_size_specified
) {
8473 for (int i
= 0; i
< 3; i
++) {
8474 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8475 _mesa_glsl_error(&loc
, state
,
8476 "compute shader input layout does not match"
8477 " previous declaration");
8483 /* The ARB_compute_variable_group_size spec says:
8485 * If a compute shader including a *local_size_variable* qualifier also
8486 * declares a fixed local group size using the *local_size_x*,
8487 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8490 if (state
->cs_input_local_size_variable_specified
) {
8491 _mesa_glsl_error(&loc
, state
,
8492 "compute shader can't include both a variable and a "
8493 "fixed local group size");
8497 state
->cs_input_local_size_specified
= true;
8498 for (int i
= 0; i
< 3; i
++)
8499 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8501 /* We may now declare the built-in constant gl_WorkGroupSize (see
8502 * builtin_variable_generator::generate_constants() for why we didn't
8503 * declare it earlier).
8505 ir_variable
*var
= new(state
->symbols
)
8506 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8507 var
->data
.how_declared
= ir_var_declared_implicitly
;
8508 var
->data
.read_only
= true;
8509 instructions
->push_tail(var
);
8510 state
->symbols
->add_variable(var
);
8511 ir_constant_data data
;
8512 memset(&data
, 0, sizeof(data
));
8513 for (int i
= 0; i
< 3; i
++)
8514 data
.u
[i
] = qual_local_size
[i
];
8515 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8516 var
->constant_initializer
=
8517 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8518 var
->data
.has_initializer
= true;
8525 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8526 exec_list
*instructions
)
8528 bool gl_FragColor_assigned
= false;
8529 bool gl_FragData_assigned
= false;
8530 bool gl_FragSecondaryColor_assigned
= false;
8531 bool gl_FragSecondaryData_assigned
= false;
8532 bool user_defined_fs_output_assigned
= false;
8533 ir_variable
*user_defined_fs_output
= NULL
;
8535 /* It would be nice to have proper location information. */
8537 memset(&loc
, 0, sizeof(loc
));
8539 foreach_in_list(ir_instruction
, node
, instructions
) {
8540 ir_variable
*var
= node
->as_variable();
8542 if (!var
|| !var
->data
.assigned
)
8545 if (strcmp(var
->name
, "gl_FragColor") == 0)
8546 gl_FragColor_assigned
= true;
8547 else if (strcmp(var
->name
, "gl_FragData") == 0)
8548 gl_FragData_assigned
= true;
8549 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8550 gl_FragSecondaryColor_assigned
= true;
8551 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8552 gl_FragSecondaryData_assigned
= true;
8553 else if (!is_gl_identifier(var
->name
)) {
8554 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8555 var
->data
.mode
== ir_var_shader_out
) {
8556 user_defined_fs_output_assigned
= true;
8557 user_defined_fs_output
= var
;
8562 /* From the GLSL 1.30 spec:
8564 * "If a shader statically assigns a value to gl_FragColor, it
8565 * may not assign a value to any element of gl_FragData. If a
8566 * shader statically writes a value to any element of
8567 * gl_FragData, it may not assign a value to
8568 * gl_FragColor. That is, a shader may assign values to either
8569 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8570 * linked together must also consistently write just one of
8571 * these variables. Similarly, if user declared output
8572 * variables are in use (statically assigned to), then the
8573 * built-in variables gl_FragColor and gl_FragData may not be
8574 * assigned to. These incorrect usages all generate compile
8577 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8578 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8579 "`gl_FragColor' and `gl_FragData'");
8580 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8581 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8582 "`gl_FragColor' and `%s'",
8583 user_defined_fs_output
->name
);
8584 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8585 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8586 "`gl_FragSecondaryColorEXT' and"
8587 " `gl_FragSecondaryDataEXT'");
8588 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8589 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8590 "`gl_FragColor' and"
8591 " `gl_FragSecondaryDataEXT'");
8592 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8593 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8595 " `gl_FragSecondaryColorEXT'");
8596 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8597 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8598 "`gl_FragData' and `%s'",
8599 user_defined_fs_output
->name
);
8602 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8603 !state
->EXT_blend_func_extended_enable
) {
8604 _mesa_glsl_error(&loc
, state
,
8605 "Dual source blending requires EXT_blend_func_extended");
8611 remove_per_vertex_blocks(exec_list
*instructions
,
8612 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8614 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8615 * if it exists in this shader type.
8617 const glsl_type
*per_vertex
= NULL
;
8619 case ir_var_shader_in
:
8620 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8621 per_vertex
= gl_in
->get_interface_type();
8623 case ir_var_shader_out
:
8624 if (ir_variable
*gl_Position
=
8625 state
->symbols
->get_variable("gl_Position")) {
8626 per_vertex
= gl_Position
->get_interface_type();
8630 assert(!"Unexpected mode");
8634 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8635 * need to do anything.
8637 if (per_vertex
== NULL
)
8640 /* If the interface block is used by the shader, then we don't need to do
8643 interface_block_usage_visitor
v(mode
, per_vertex
);
8644 v
.run(instructions
);
8645 if (v
.usage_found())
8648 /* Remove any ir_variable declarations that refer to the interface block
8651 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8652 ir_variable
*const var
= node
->as_variable();
8653 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8654 var
->data
.mode
== mode
) {
8655 state
->symbols
->disable_variable(var
->name
);