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 "program/hash_table.h"
57 #include "main/macros.h"
58 #include "main/shaderobj.h"
60 #include "ir_builder.h"
62 using namespace ir_builder
;
65 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
66 exec_list
*instructions
);
68 remove_per_vertex_blocks(exec_list
*instructions
,
69 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
72 * Visitor class that finds the first instance of any write-only variable that
73 * is ever read, if any
75 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
78 read_from_write_only_variable_visitor() : found(NULL
)
82 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
84 if (this->in_assignee
)
85 return visit_continue
;
87 ir_variable
*var
= ir
->variable_referenced();
88 /* We can have image_write_only set on both images and buffer variables,
89 * but in the former there is a distinction between reads from
90 * the variable itself (write_only) and from the memory they point to
91 * (image_write_only), while in the case of buffer variables there is
92 * no such distinction, that is why this check here is limited to
93 * buffer variables alone.
95 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
96 return visit_continue
;
98 if (var
->data
.image_write_only
) {
103 return visit_continue
;
106 ir_variable
*get_variable() {
110 virtual ir_visitor_status
visit_enter(ir_expression
*ir
)
112 /* .length() doesn't actually read anything */
113 if (ir
->operation
== ir_unop_ssbo_unsized_array_length
)
114 return visit_continue_with_parent
;
116 return visit_continue
;
124 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
126 _mesa_glsl_initialize_variables(instructions
, state
);
128 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
130 state
->current_function
= NULL
;
132 state
->toplevel_ir
= instructions
;
134 state
->gs_input_prim_type_specified
= false;
135 state
->tcs_output_vertices_specified
= false;
136 state
->cs_input_local_size_specified
= false;
138 /* Section 4.2 of the GLSL 1.20 specification states:
139 * "The built-in functions are scoped in a scope outside the global scope
140 * users declare global variables in. That is, a shader's global scope,
141 * available for user-defined functions and global variables, is nested
142 * inside the scope containing the built-in functions."
144 * Since built-in functions like ftransform() access built-in variables,
145 * it follows that those must be in the outer scope as well.
147 * We push scope here to create this nesting effect...but don't pop.
148 * This way, a shader's globals are still in the symbol table for use
151 state
->symbols
->push_scope();
153 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
154 ast
->hir(instructions
, state
);
156 detect_recursion_unlinked(state
, instructions
);
157 detect_conflicting_assignments(state
, instructions
);
159 state
->toplevel_ir
= NULL
;
161 /* Move all of the variable declarations to the front of the IR list, and
162 * reverse the order. This has the (intended!) side effect that vertex
163 * shader inputs and fragment shader outputs will appear in the IR in the
164 * same order that they appeared in the shader code. This results in the
165 * locations being assigned in the declared order. Many (arguably buggy)
166 * applications depend on this behavior, and it matches what nearly all
169 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
170 ir_variable
*const var
= node
->as_variable();
176 instructions
->push_head(var
);
179 /* Figure out if gl_FragCoord is actually used in fragment shader */
180 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
182 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
184 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
186 * If multiple shaders using members of a built-in block belonging to
187 * the same interface are linked together in the same program, they
188 * must all redeclare the built-in block in the same way, as described
189 * in section 4.3.7 "Interface Blocks" for interface block matching, or
190 * a link error will result.
192 * The phrase "using members of a built-in block" implies that if two
193 * shaders are linked together and one of them *does not use* any members
194 * of the built-in block, then that shader does not need to have a matching
195 * redeclaration of the built-in block.
197 * This appears to be a clarification to the behaviour established for
198 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
201 * The definition of "interface" in section 4.3.7 that applies here is as
204 * The boundary between adjacent programmable pipeline stages: This
205 * spans all the outputs in all compilation units of the first stage
206 * and all the inputs in all compilation units of the second stage.
208 * Therefore this rule applies to both inter- and intra-stage linking.
210 * The easiest way to implement this is to check whether the shader uses
211 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
212 * remove all the relevant variable declaration from the IR, so that the
213 * linker won't see them and complain about mismatches.
215 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
216 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
218 /* Check that we don't have reads from write-only variables */
219 read_from_write_only_variable_visitor v
;
221 ir_variable
*error_var
= v
.get_variable();
223 /* It would be nice to have proper location information, but for that
224 * we would need to check this as we process each kind of AST node
227 memset(&loc
, 0, sizeof(loc
));
228 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
234 static ir_expression_operation
235 get_implicit_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
236 struct _mesa_glsl_parse_state
*state
)
238 switch (to
->base_type
) {
239 case GLSL_TYPE_FLOAT
:
240 switch (from
->base_type
) {
241 case GLSL_TYPE_INT
: return ir_unop_i2f
;
242 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
243 default: return (ir_expression_operation
)0;
247 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
248 && !state
->MESA_shader_integer_functions_enable
)
249 return (ir_expression_operation
)0;
250 switch (from
->base_type
) {
251 case GLSL_TYPE_INT
: return ir_unop_i2u
;
252 default: return (ir_expression_operation
)0;
255 case GLSL_TYPE_DOUBLE
:
256 if (!state
->has_double())
257 return (ir_expression_operation
)0;
258 switch (from
->base_type
) {
259 case GLSL_TYPE_INT
: return ir_unop_i2d
;
260 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
261 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
262 default: return (ir_expression_operation
)0;
265 default: return (ir_expression_operation
)0;
271 * If a conversion is available, convert one operand to a different type
273 * The \c from \c ir_rvalue is converted "in place".
275 * \param to Type that the operand it to be converted to
276 * \param from Operand that is being converted
277 * \param state GLSL compiler state
280 * If a conversion is possible (or unnecessary), \c true is returned.
281 * Otherwise \c false is returned.
284 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
285 struct _mesa_glsl_parse_state
*state
)
288 if (to
->base_type
== from
->type
->base_type
)
291 /* Prior to GLSL 1.20, there are no implicit conversions */
292 if (!state
->is_version(120, 0))
295 /* ESSL does not allow implicit conversions */
296 if (state
->es_shader
)
299 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
301 * "There are no implicit array or structure conversions. For
302 * example, an array of int cannot be implicitly converted to an
305 if (!to
->is_numeric() || !from
->type
->is_numeric())
308 /* We don't actually want the specific type `to`, we want a type
309 * with the same base type as `to`, but the same vector width as
312 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
313 from
->type
->matrix_columns
);
315 ir_expression_operation op
= get_implicit_conversion_operation(to
, from
->type
, state
);
317 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
325 static const struct glsl_type
*
326 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
328 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
330 const glsl_type
*type_a
= value_a
->type
;
331 const glsl_type
*type_b
= value_b
->type
;
333 /* From GLSL 1.50 spec, page 56:
335 * "The arithmetic binary operators add (+), subtract (-),
336 * multiply (*), and divide (/) operate on integer and
337 * floating-point scalars, vectors, and matrices."
339 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
340 _mesa_glsl_error(loc
, state
,
341 "operands to arithmetic operators must be numeric");
342 return glsl_type::error_type
;
346 /* "If one operand is floating-point based and the other is
347 * not, then the conversions from Section 4.1.10 "Implicit
348 * Conversions" are applied to the non-floating-point-based operand."
350 if (!apply_implicit_conversion(type_a
, value_b
, state
)
351 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
352 _mesa_glsl_error(loc
, state
,
353 "could not implicitly convert operands to "
354 "arithmetic operator");
355 return glsl_type::error_type
;
357 type_a
= value_a
->type
;
358 type_b
= value_b
->type
;
360 /* "If the operands are integer types, they must both be signed or
363 * From this rule and the preceeding conversion it can be inferred that
364 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
365 * The is_numeric check above already filtered out the case where either
366 * type is not one of these, so now the base types need only be tested for
369 if (type_a
->base_type
!= type_b
->base_type
) {
370 _mesa_glsl_error(loc
, state
,
371 "base type mismatch for arithmetic operator");
372 return glsl_type::error_type
;
375 /* "All arithmetic binary operators result in the same fundamental type
376 * (signed integer, unsigned integer, or floating-point) as the
377 * operands they operate on, after operand type conversion. After
378 * conversion, the following cases are valid
380 * * The two operands are scalars. In this case the operation is
381 * applied, resulting in a scalar."
383 if (type_a
->is_scalar() && type_b
->is_scalar())
386 /* "* One operand is a scalar, and the other is a vector or matrix.
387 * In this case, the scalar operation is applied independently to each
388 * component of the vector or matrix, resulting in the same size
391 if (type_a
->is_scalar()) {
392 if (!type_b
->is_scalar())
394 } else if (type_b
->is_scalar()) {
398 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
399 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
402 assert(!type_a
->is_scalar());
403 assert(!type_b
->is_scalar());
405 /* "* The two operands are vectors of the same size. In this case, the
406 * operation is done component-wise resulting in the same size
409 if (type_a
->is_vector() && type_b
->is_vector()) {
410 if (type_a
== type_b
) {
413 _mesa_glsl_error(loc
, state
,
414 "vector size mismatch for arithmetic operator");
415 return glsl_type::error_type
;
419 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
420 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
421 * <vector, vector> have been handled. At least one of the operands must
422 * be matrix. Further, since there are no integer matrix types, the base
423 * type of both operands must be float.
425 assert(type_a
->is_matrix() || type_b
->is_matrix());
426 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
427 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
428 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
429 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
431 /* "* The operator is add (+), subtract (-), or divide (/), and the
432 * operands are matrices with the same number of rows and the same
433 * number of columns. In this case, the operation is done component-
434 * wise resulting in the same size matrix."
435 * * The operator is multiply (*), where both operands are matrices or
436 * one operand is a vector and the other a matrix. A right vector
437 * operand is treated as a column vector and a left vector operand as a
438 * row vector. In all these cases, it is required that the number of
439 * columns of the left operand is equal to the number of rows of the
440 * right operand. Then, the multiply (*) operation does a linear
441 * algebraic multiply, yielding an object that has the same number of
442 * rows as the left operand and the same number of columns as the right
443 * operand. Section 5.10 "Vector and Matrix Operations" explains in
444 * more detail how vectors and matrices are operated on."
447 if (type_a
== type_b
)
450 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
452 if (type
== glsl_type::error_type
) {
453 _mesa_glsl_error(loc
, state
,
454 "size mismatch for matrix multiplication");
461 /* "All other cases are illegal."
463 _mesa_glsl_error(loc
, state
, "type mismatch");
464 return glsl_type::error_type
;
468 static const struct glsl_type
*
469 unary_arithmetic_result_type(const struct glsl_type
*type
,
470 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
472 /* From GLSL 1.50 spec, page 57:
474 * "The arithmetic unary operators negate (-), post- and pre-increment
475 * and decrement (-- and ++) operate on integer or floating-point
476 * values (including vectors and matrices). All unary operators work
477 * component-wise on their operands. These result with the same type
480 if (!type
->is_numeric()) {
481 _mesa_glsl_error(loc
, state
,
482 "operands to arithmetic operators must be numeric");
483 return glsl_type::error_type
;
490 * \brief Return the result type of a bit-logic operation.
492 * If the given types to the bit-logic operator are invalid, return
493 * glsl_type::error_type.
495 * \param value_a LHS of bit-logic op
496 * \param value_b RHS of bit-logic op
498 static const struct glsl_type
*
499 bit_logic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
501 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
503 const glsl_type
*type_a
= value_a
->type
;
504 const glsl_type
*type_b
= value_b
->type
;
506 if (!state
->check_bitwise_operations_allowed(loc
)) {
507 return glsl_type::error_type
;
510 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
512 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
513 * (|). The operands must be of type signed or unsigned integers or
516 if (!type_a
->is_integer()) {
517 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
518 ast_expression::operator_string(op
));
519 return glsl_type::error_type
;
521 if (!type_b
->is_integer()) {
522 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
523 ast_expression::operator_string(op
));
524 return glsl_type::error_type
;
527 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
528 * make sense for bitwise operations, as they don't operate on floats.
530 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
531 * here. It wasn't clear whether or not we should apply them to bitwise
532 * operations. However, Khronos has decided that they should in future
533 * language revisions. Applications also rely on this behavior. We opt
534 * to apply them in general, but issue a portability warning.
536 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
538 if (type_a
->base_type
!= type_b
->base_type
) {
539 if (!apply_implicit_conversion(type_a
, value_b
, state
)
540 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
541 _mesa_glsl_error(loc
, state
,
542 "could not implicitly convert operands to "
544 ast_expression::operator_string(op
));
545 return glsl_type::error_type
;
547 _mesa_glsl_warning(loc
, state
,
548 "some implementations may not support implicit "
549 "int -> uint conversions for `%s' operators; "
550 "consider casting explicitly for portability",
551 ast_expression::operator_string(op
));
553 type_a
= value_a
->type
;
554 type_b
= value_b
->type
;
557 /* "The fundamental types of the operands (signed or unsigned) must
560 if (type_a
->base_type
!= type_b
->base_type
) {
561 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
562 "base type", ast_expression::operator_string(op
));
563 return glsl_type::error_type
;
566 /* "The operands cannot be vectors of differing size." */
567 if (type_a
->is_vector() &&
568 type_b
->is_vector() &&
569 type_a
->vector_elements
!= type_b
->vector_elements
) {
570 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
571 "different sizes", ast_expression::operator_string(op
));
572 return glsl_type::error_type
;
575 /* "If one operand is a scalar and the other a vector, the scalar is
576 * applied component-wise to the vector, resulting in the same type as
577 * the vector. The fundamental types of the operands [...] will be the
578 * resulting fundamental type."
580 if (type_a
->is_scalar())
586 static const struct glsl_type
*
587 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
588 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
590 const glsl_type
*type_a
= value_a
->type
;
591 const glsl_type
*type_b
= value_b
->type
;
593 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
594 return glsl_type::error_type
;
597 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
599 * "The operator modulus (%) operates on signed or unsigned integers or
602 if (!type_a
->is_integer()) {
603 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
604 return glsl_type::error_type
;
606 if (!type_b
->is_integer()) {
607 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
608 return glsl_type::error_type
;
611 /* "If the fundamental types in the operands do not match, then the
612 * conversions from section 4.1.10 "Implicit Conversions" are applied
613 * to create matching types."
615 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
616 * int -> uint conversion rules. Prior to that, there were no implicit
617 * conversions. So it's harmless to apply them universally - no implicit
618 * conversions will exist. If the types don't match, we'll receive false,
619 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
621 * "The operand types must both be signed or unsigned."
623 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
624 !apply_implicit_conversion(type_b
, value_a
, state
)) {
625 _mesa_glsl_error(loc
, state
,
626 "could not implicitly convert operands to "
627 "modulus (%%) operator");
628 return glsl_type::error_type
;
630 type_a
= value_a
->type
;
631 type_b
= value_b
->type
;
633 /* "The operands cannot be vectors of differing size. If one operand is
634 * a scalar and the other vector, then the scalar is applied component-
635 * wise to the vector, resulting in the same type as the vector. If both
636 * are vectors of the same size, the result is computed component-wise."
638 if (type_a
->is_vector()) {
639 if (!type_b
->is_vector()
640 || (type_a
->vector_elements
== type_b
->vector_elements
))
645 /* "The operator modulus (%) is not defined for any other data types
646 * (non-integer types)."
648 _mesa_glsl_error(loc
, state
, "type mismatch");
649 return glsl_type::error_type
;
653 static const struct glsl_type
*
654 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
655 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
657 const glsl_type
*type_a
= value_a
->type
;
658 const glsl_type
*type_b
= value_b
->type
;
660 /* From GLSL 1.50 spec, page 56:
661 * "The relational operators greater than (>), less than (<), greater
662 * than or equal (>=), and less than or equal (<=) operate only on
663 * scalar integer and scalar floating-point expressions."
665 if (!type_a
->is_numeric()
666 || !type_b
->is_numeric()
667 || !type_a
->is_scalar()
668 || !type_b
->is_scalar()) {
669 _mesa_glsl_error(loc
, state
,
670 "operands to relational operators must be scalar and "
672 return glsl_type::error_type
;
675 /* "Either the operands' types must match, or the conversions from
676 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
677 * operand, after which the types must match."
679 if (!apply_implicit_conversion(type_a
, value_b
, state
)
680 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
681 _mesa_glsl_error(loc
, state
,
682 "could not implicitly convert operands to "
683 "relational operator");
684 return glsl_type::error_type
;
686 type_a
= value_a
->type
;
687 type_b
= value_b
->type
;
689 if (type_a
->base_type
!= type_b
->base_type
) {
690 _mesa_glsl_error(loc
, state
, "base type mismatch");
691 return glsl_type::error_type
;
694 /* "The result is scalar Boolean."
696 return glsl_type::bool_type
;
700 * \brief Return the result type of a bit-shift operation.
702 * If the given types to the bit-shift operator are invalid, return
703 * glsl_type::error_type.
705 * \param type_a Type of LHS of bit-shift op
706 * \param type_b Type of RHS of bit-shift op
708 static const struct glsl_type
*
709 shift_result_type(const struct glsl_type
*type_a
,
710 const struct glsl_type
*type_b
,
712 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
714 if (!state
->check_bitwise_operations_allowed(loc
)) {
715 return glsl_type::error_type
;
718 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
720 * "The shift operators (<<) and (>>). For both operators, the operands
721 * must be signed or unsigned integers or integer vectors. One operand
722 * can be signed while the other is unsigned."
724 if (!type_a
->is_integer()) {
725 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
726 "integer vector", ast_expression::operator_string(op
));
727 return glsl_type::error_type
;
730 if (!type_b
->is_integer()) {
731 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
732 "integer vector", ast_expression::operator_string(op
));
733 return glsl_type::error_type
;
736 /* "If the first operand is a scalar, the second operand has to be
739 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
740 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
741 "second must be scalar as well",
742 ast_expression::operator_string(op
));
743 return glsl_type::error_type
;
746 /* If both operands are vectors, check that they have same number of
749 if (type_a
->is_vector() &&
750 type_b
->is_vector() &&
751 type_a
->vector_elements
!= type_b
->vector_elements
) {
752 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
753 "have same number of elements",
754 ast_expression::operator_string(op
));
755 return glsl_type::error_type
;
758 /* "In all cases, the resulting type will be the same type as the left
765 * Returns the innermost array index expression in an rvalue tree.
766 * This is the largest indexing level -- if an array of blocks, then
767 * it is the block index rather than an indexing expression for an
768 * array-typed member of an array of blocks.
771 find_innermost_array_index(ir_rvalue
*rv
)
773 ir_dereference_array
*last
= NULL
;
775 if (rv
->as_dereference_array()) {
776 last
= rv
->as_dereference_array();
778 } else if (rv
->as_dereference_record())
779 rv
= rv
->as_dereference_record()->record
;
780 else if (rv
->as_swizzle())
781 rv
= rv
->as_swizzle()->val
;
787 return last
->array_index
;
793 * Validates that a value can be assigned to a location with a specified type
795 * Validates that \c rhs can be assigned to some location. If the types are
796 * not an exact match but an automatic conversion is possible, \c rhs will be
800 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
801 * Otherwise the actual RHS to be assigned will be returned. This may be
802 * \c rhs, or it may be \c rhs after some type conversion.
805 * In addition to being used for assignments, this function is used to
806 * type-check return values.
809 validate_assignment(struct _mesa_glsl_parse_state
*state
,
810 YYLTYPE loc
, ir_rvalue
*lhs
,
811 ir_rvalue
*rhs
, bool is_initializer
)
813 /* If there is already some error in the RHS, just return it. Anything
814 * else will lead to an avalanche of error message back to the user.
816 if (rhs
->type
->is_error())
819 /* In the Tessellation Control Shader:
820 * If a per-vertex output variable is used as an l-value, it is an error
821 * if the expression indicating the vertex number is not the identifier
824 if (state
->stage
== MESA_SHADER_TESS_CTRL
&& !lhs
->type
->is_error()) {
825 ir_variable
*var
= lhs
->variable_referenced();
826 if (var
&& var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
827 ir_rvalue
*index
= find_innermost_array_index(lhs
);
828 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
829 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
830 _mesa_glsl_error(&loc
, state
,
831 "Tessellation control shader outputs can only "
832 "be indexed by gl_InvocationID");
838 /* If the types are identical, the assignment can trivially proceed.
840 if (rhs
->type
== lhs
->type
)
843 /* If the array element types are the same and the LHS is unsized,
844 * the assignment is okay for initializers embedded in variable
847 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
848 * is handled by ir_dereference::is_lvalue.
850 const glsl_type
*lhs_t
= lhs
->type
;
851 const glsl_type
*rhs_t
= rhs
->type
;
852 bool unsized_array
= false;
853 while(lhs_t
->is_array()) {
855 break; /* the rest of the inner arrays match so break out early */
856 if (!rhs_t
->is_array()) {
857 unsized_array
= false;
858 break; /* number of dimensions mismatch */
860 if (lhs_t
->length
== rhs_t
->length
) {
861 lhs_t
= lhs_t
->fields
.array
;
862 rhs_t
= rhs_t
->fields
.array
;
864 } else if (lhs_t
->is_unsized_array()) {
865 unsized_array
= true;
867 unsized_array
= false;
868 break; /* sized array mismatch */
870 lhs_t
= lhs_t
->fields
.array
;
871 rhs_t
= rhs_t
->fields
.array
;
874 if (is_initializer
) {
877 _mesa_glsl_error(&loc
, state
,
878 "implicitly sized arrays cannot be assigned");
883 /* Check for implicit conversion in GLSL 1.20 */
884 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
885 if (rhs
->type
== lhs
->type
)
889 _mesa_glsl_error(&loc
, state
,
890 "%s of type %s cannot be assigned to "
891 "variable of type %s",
892 is_initializer
? "initializer" : "value",
893 rhs
->type
->name
, lhs
->type
->name
);
899 mark_whole_array_access(ir_rvalue
*access
)
901 ir_dereference_variable
*deref
= access
->as_dereference_variable();
903 if (deref
&& deref
->var
) {
904 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
909 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
910 const char *non_lvalue_description
,
911 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
912 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
917 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
919 ir_variable
*lhs_var
= lhs
->variable_referenced();
921 lhs_var
->data
.assigned
= true;
923 if (!error_emitted
) {
924 if (non_lvalue_description
!= NULL
) {
925 _mesa_glsl_error(&lhs_loc
, state
,
927 non_lvalue_description
);
928 error_emitted
= true;
929 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
930 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
931 lhs_var
->data
.image_read_only
))) {
932 /* We can have image_read_only set on both images and buffer variables,
933 * but in the former there is a distinction between assignments to
934 * the variable itself (read_only) and to the memory they point to
935 * (image_read_only), while in the case of buffer variables there is
936 * no such distinction, that is why this check here is limited to
937 * buffer variables alone.
939 _mesa_glsl_error(&lhs_loc
, state
,
940 "assignment to read-only variable '%s'",
942 error_emitted
= true;
943 } else if (lhs
->type
->is_array() &&
944 !state
->check_version(120, 300, &lhs_loc
,
945 "whole array assignment forbidden")) {
946 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
948 * "Other binary or unary expressions, non-dereferenced
949 * arrays, function names, swizzles with repeated fields,
950 * and constants cannot be l-values."
952 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
954 error_emitted
= true;
955 } else if (!lhs
->is_lvalue()) {
956 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
957 error_emitted
= true;
962 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
963 if (new_rhs
!= NULL
) {
966 /* If the LHS array was not declared with a size, it takes it size from
967 * the RHS. If the LHS is an l-value and a whole array, it must be a
968 * dereference of a variable. Any other case would require that the LHS
969 * is either not an l-value or not a whole array.
971 if (lhs
->type
->is_unsized_array()) {
972 ir_dereference
*const d
= lhs
->as_dereference();
976 ir_variable
*const var
= d
->variable_referenced();
980 if (var
->data
.max_array_access
>= rhs
->type
->array_size()) {
981 /* FINISHME: This should actually log the location of the RHS. */
982 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
984 var
->data
.max_array_access
);
987 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
988 rhs
->type
->array_size());
991 if (lhs
->type
->is_array()) {
992 mark_whole_array_access(rhs
);
993 mark_whole_array_access(lhs
);
997 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
998 * but not post_inc) need the converted assigned value as an rvalue
999 * to handle things like:
1004 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1006 instructions
->push_tail(var
);
1007 instructions
->push_tail(assign(var
, rhs
));
1009 if (!error_emitted
) {
1010 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
1011 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1013 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
1015 *out_rvalue
= rvalue
;
1018 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1022 return error_emitted
;
1026 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1028 void *ctx
= ralloc_parent(lvalue
);
1031 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1033 instructions
->push_tail(var
);
1035 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1038 return new(ctx
) ir_dereference_variable(var
);
1043 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1045 (void) instructions
;
1052 ast_node::has_sequence_subexpression() const
1058 ast_node::set_is_lhs(bool /* new_value */)
1063 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1064 struct _mesa_glsl_parse_state
*state
)
1066 (void)hir(instructions
, state
);
1070 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1071 struct _mesa_glsl_parse_state
*state
)
1073 (void)hir(instructions
, state
);
1077 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1080 ir_rvalue
*cmp
= NULL
;
1082 if (operation
== ir_binop_all_equal
)
1083 join_op
= ir_binop_logic_and
;
1085 join_op
= ir_binop_logic_or
;
1087 switch (op0
->type
->base_type
) {
1088 case GLSL_TYPE_FLOAT
:
1089 case GLSL_TYPE_UINT
:
1091 case GLSL_TYPE_BOOL
:
1092 case GLSL_TYPE_DOUBLE
:
1093 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1095 case GLSL_TYPE_ARRAY
: {
1096 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1097 ir_rvalue
*e0
, *e1
, *result
;
1099 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1100 new(mem_ctx
) ir_constant(i
));
1101 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1102 new(mem_ctx
) ir_constant(i
));
1103 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1106 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1112 mark_whole_array_access(op0
);
1113 mark_whole_array_access(op1
);
1117 case GLSL_TYPE_STRUCT
: {
1118 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1119 ir_rvalue
*e0
, *e1
, *result
;
1120 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1122 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1124 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1126 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1129 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1137 case GLSL_TYPE_ERROR
:
1138 case GLSL_TYPE_VOID
:
1139 case GLSL_TYPE_SAMPLER
:
1140 case GLSL_TYPE_IMAGE
:
1141 case GLSL_TYPE_INTERFACE
:
1142 case GLSL_TYPE_ATOMIC_UINT
:
1143 case GLSL_TYPE_SUBROUTINE
:
1144 case GLSL_TYPE_FUNCTION
:
1145 /* I assume a comparison of a struct containing a sampler just
1146 * ignores the sampler present in the type.
1152 cmp
= new(mem_ctx
) ir_constant(true);
1157 /* For logical operations, we want to ensure that the operands are
1158 * scalar booleans. If it isn't, emit an error and return a constant
1159 * boolean to avoid triggering cascading error messages.
1162 get_scalar_boolean_operand(exec_list
*instructions
,
1163 struct _mesa_glsl_parse_state
*state
,
1164 ast_expression
*parent_expr
,
1166 const char *operand_name
,
1167 bool *error_emitted
)
1169 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1171 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1173 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1176 if (!*error_emitted
) {
1177 YYLTYPE loc
= expr
->get_location();
1178 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1180 parent_expr
->operator_string(parent_expr
->oper
));
1181 *error_emitted
= true;
1184 return new(ctx
) ir_constant(true);
1188 * If name refers to a builtin array whose maximum allowed size is less than
1189 * size, report an error and return true. Otherwise return false.
1192 check_builtin_array_max_size(const char *name
, unsigned size
,
1193 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1195 if ((strcmp("gl_TexCoord", name
) == 0)
1196 && (size
> state
->Const
.MaxTextureCoords
)) {
1197 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1199 * "The size [of gl_TexCoord] can be at most
1200 * gl_MaxTextureCoords."
1202 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1203 "be larger than gl_MaxTextureCoords (%u)",
1204 state
->Const
.MaxTextureCoords
);
1205 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1206 state
->clip_dist_size
= size
;
1207 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1208 /* From section 7.1 (Vertex Shader Special Variables) of the
1211 * "The gl_ClipDistance array is predeclared as unsized and
1212 * must be sized by the shader either redeclaring it with a
1213 * size or indexing it only with integral constant
1214 * expressions. ... The size can be at most
1215 * gl_MaxClipDistances."
1217 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1218 "be larger than gl_MaxClipDistances (%u)",
1219 state
->Const
.MaxClipPlanes
);
1221 } else if (strcmp("gl_CullDistance", name
) == 0) {
1222 state
->cull_dist_size
= size
;
1223 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1224 /* From the ARB_cull_distance spec:
1226 * "The gl_CullDistance array is predeclared as unsized and
1227 * must be sized by the shader either redeclaring it with
1228 * a size or indexing it only with integral constant
1229 * expressions. The size determines the number and set of
1230 * enabled cull distances and can be at most
1231 * gl_MaxCullDistances."
1233 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1234 "be larger than gl_MaxCullDistances (%u)",
1235 state
->Const
.MaxClipPlanes
);
1241 * Create the constant 1, of a which is appropriate for incrementing and
1242 * decrementing values of the given GLSL type. For example, if type is vec4,
1243 * this creates a constant value of 1.0 having type float.
1245 * If the given type is invalid for increment and decrement operators, return
1246 * a floating point 1--the error will be detected later.
1249 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1251 switch (type
->base_type
) {
1252 case GLSL_TYPE_UINT
:
1253 return new(ctx
) ir_constant((unsigned) 1);
1255 return new(ctx
) ir_constant(1);
1257 case GLSL_TYPE_FLOAT
:
1258 return new(ctx
) ir_constant(1.0f
);
1263 ast_expression::hir(exec_list
*instructions
,
1264 struct _mesa_glsl_parse_state
*state
)
1266 return do_hir(instructions
, state
, true);
1270 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1271 struct _mesa_glsl_parse_state
*state
)
1273 do_hir(instructions
, state
, false);
1277 ast_expression::set_is_lhs(bool new_value
)
1279 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1280 * if we lack an identifier we can just skip it.
1282 if (this->primary_expression
.identifier
== NULL
)
1285 this->is_lhs
= new_value
;
1287 /* We need to go through the subexpressions tree to cover cases like
1288 * ast_field_selection
1290 if (this->subexpressions
[0] != NULL
)
1291 this->subexpressions
[0]->set_is_lhs(new_value
);
1295 ast_expression::do_hir(exec_list
*instructions
,
1296 struct _mesa_glsl_parse_state
*state
,
1300 static const int operations
[AST_NUM_OPERATORS
] = {
1301 -1, /* ast_assign doesn't convert to ir_expression. */
1302 -1, /* ast_plus doesn't convert to ir_expression. */
1316 ir_binop_any_nequal
,
1326 /* Note: The following block of expression types actually convert
1327 * to multiple IR instructions.
1329 ir_binop_mul
, /* ast_mul_assign */
1330 ir_binop_div
, /* ast_div_assign */
1331 ir_binop_mod
, /* ast_mod_assign */
1332 ir_binop_add
, /* ast_add_assign */
1333 ir_binop_sub
, /* ast_sub_assign */
1334 ir_binop_lshift
, /* ast_ls_assign */
1335 ir_binop_rshift
, /* ast_rs_assign */
1336 ir_binop_bit_and
, /* ast_and_assign */
1337 ir_binop_bit_xor
, /* ast_xor_assign */
1338 ir_binop_bit_or
, /* ast_or_assign */
1340 -1, /* ast_conditional doesn't convert to ir_expression. */
1341 ir_binop_add
, /* ast_pre_inc. */
1342 ir_binop_sub
, /* ast_pre_dec. */
1343 ir_binop_add
, /* ast_post_inc. */
1344 ir_binop_sub
, /* ast_post_dec. */
1345 -1, /* ast_field_selection doesn't conv to ir_expression. */
1346 -1, /* ast_array_index doesn't convert to ir_expression. */
1347 -1, /* ast_function_call doesn't conv to ir_expression. */
1348 -1, /* ast_identifier doesn't convert to ir_expression. */
1349 -1, /* ast_int_constant doesn't convert to ir_expression. */
1350 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1351 -1, /* ast_float_constant doesn't conv to ir_expression. */
1352 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1353 -1, /* ast_sequence doesn't convert to ir_expression. */
1354 -1, /* ast_aggregate shouldn't ever even get here. */
1356 ir_rvalue
*result
= NULL
;
1358 const struct glsl_type
*type
, *orig_type
;
1359 bool error_emitted
= false;
1362 loc
= this->get_location();
1364 switch (this->oper
) {
1366 assert(!"ast_aggregate: Should never get here.");
1370 this->subexpressions
[0]->set_is_lhs(true);
1371 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1372 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1375 do_assignment(instructions
, state
,
1376 this->subexpressions
[0]->non_lvalue_description
,
1377 op
[0], op
[1], &result
, needs_rvalue
, false,
1378 this->subexpressions
[0]->get_location());
1383 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1385 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1387 error_emitted
= type
->is_error();
1393 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1395 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1397 error_emitted
= type
->is_error();
1399 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1407 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1408 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1410 type
= arithmetic_result_type(op
[0], op
[1],
1411 (this->oper
== ast_mul
),
1413 error_emitted
= type
->is_error();
1415 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1420 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1421 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1423 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1425 assert(operations
[this->oper
] == ir_binop_mod
);
1427 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1429 error_emitted
= type
->is_error();
1434 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1435 error_emitted
= true;
1438 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1439 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1440 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1442 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1444 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1451 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1452 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1454 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1456 /* The relational operators must either generate an error or result
1457 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1459 assert(type
->is_error()
1460 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1461 && type
->is_scalar()));
1463 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1465 error_emitted
= type
->is_error();
1470 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1471 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1473 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1475 * "The equality operators equal (==), and not equal (!=)
1476 * operate on all types. They result in a scalar Boolean. If
1477 * the operand types do not match, then there must be a
1478 * conversion from Section 4.1.10 "Implicit Conversions"
1479 * applied to one operand that can make them match, in which
1480 * case this conversion is done."
1483 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1484 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1485 "no operation `%1$s' exists that takes a left-hand "
1486 "operand of type 'void' or a right operand of type "
1487 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1488 error_emitted
= true;
1489 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1490 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1491 || (op
[0]->type
!= op
[1]->type
)) {
1492 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1493 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1494 error_emitted
= true;
1495 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1496 !state
->check_version(120, 300, &loc
,
1497 "array comparisons forbidden")) {
1498 error_emitted
= true;
1499 } else if ((op
[0]->type
->contains_subroutine() ||
1500 op
[1]->type
->contains_subroutine())) {
1501 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1502 error_emitted
= true;
1503 } else if ((op
[0]->type
->contains_opaque() ||
1504 op
[1]->type
->contains_opaque())) {
1505 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1506 error_emitted
= true;
1509 if (error_emitted
) {
1510 result
= new(ctx
) ir_constant(false);
1512 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1513 assert(result
->type
== glsl_type::bool_type
);
1520 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1521 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1522 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1523 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1525 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1529 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1531 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1532 error_emitted
= true;
1535 if (!op
[0]->type
->is_integer()) {
1536 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1537 error_emitted
= true;
1540 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1541 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1544 case ast_logic_and
: {
1545 exec_list rhs_instructions
;
1546 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1547 "LHS", &error_emitted
);
1548 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1549 "RHS", &error_emitted
);
1551 if (rhs_instructions
.is_empty()) {
1552 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1553 type
= result
->type
;
1555 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1558 instructions
->push_tail(tmp
);
1560 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1561 instructions
->push_tail(stmt
);
1563 stmt
->then_instructions
.append_list(&rhs_instructions
);
1564 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1565 ir_assignment
*const then_assign
=
1566 new(ctx
) ir_assignment(then_deref
, op
[1]);
1567 stmt
->then_instructions
.push_tail(then_assign
);
1569 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1570 ir_assignment
*const else_assign
=
1571 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1572 stmt
->else_instructions
.push_tail(else_assign
);
1574 result
= new(ctx
) ir_dereference_variable(tmp
);
1580 case ast_logic_or
: {
1581 exec_list rhs_instructions
;
1582 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1583 "LHS", &error_emitted
);
1584 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1585 "RHS", &error_emitted
);
1587 if (rhs_instructions
.is_empty()) {
1588 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1589 type
= result
->type
;
1591 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1594 instructions
->push_tail(tmp
);
1596 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1597 instructions
->push_tail(stmt
);
1599 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1600 ir_assignment
*const then_assign
=
1601 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1602 stmt
->then_instructions
.push_tail(then_assign
);
1604 stmt
->else_instructions
.append_list(&rhs_instructions
);
1605 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1606 ir_assignment
*const else_assign
=
1607 new(ctx
) ir_assignment(else_deref
, op
[1]);
1608 stmt
->else_instructions
.push_tail(else_assign
);
1610 result
= new(ctx
) ir_dereference_variable(tmp
);
1617 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1619 * "The logical binary operators and (&&), or ( | | ), and
1620 * exclusive or (^^). They operate only on two Boolean
1621 * expressions and result in a Boolean expression."
1623 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1625 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1628 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1633 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1634 "operand", &error_emitted
);
1636 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1640 case ast_mul_assign
:
1641 case ast_div_assign
:
1642 case ast_add_assign
:
1643 case ast_sub_assign
: {
1644 this->subexpressions
[0]->set_is_lhs(true);
1645 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1646 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1648 orig_type
= op
[0]->type
;
1649 type
= arithmetic_result_type(op
[0], op
[1],
1650 (this->oper
== ast_mul_assign
),
1653 if (type
!= orig_type
) {
1654 _mesa_glsl_error(& loc
, state
,
1655 "could not implicitly convert "
1656 "%s to %s", type
->name
, orig_type
->name
);
1657 type
= glsl_type::error_type
;
1660 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1664 do_assignment(instructions
, state
,
1665 this->subexpressions
[0]->non_lvalue_description
,
1666 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1667 &result
, needs_rvalue
, false,
1668 this->subexpressions
[0]->get_location());
1670 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1671 * explicitly test for this because none of the binary expression
1672 * operators allow array operands either.
1678 case ast_mod_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
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1686 if (type
!= orig_type
) {
1687 _mesa_glsl_error(& loc
, state
,
1688 "could not implicitly convert "
1689 "%s to %s", type
->name
, orig_type
->name
);
1690 type
= glsl_type::error_type
;
1693 assert(operations
[this->oper
] == ir_binop_mod
);
1695 ir_rvalue
*temp_rhs
;
1696 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1700 do_assignment(instructions
, state
,
1701 this->subexpressions
[0]->non_lvalue_description
,
1702 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1703 &result
, needs_rvalue
, false,
1704 this->subexpressions
[0]->get_location());
1709 case ast_rs_assign
: {
1710 this->subexpressions
[0]->set_is_lhs(true);
1711 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1712 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1713 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1715 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1716 type
, op
[0], op
[1]);
1718 do_assignment(instructions
, state
,
1719 this->subexpressions
[0]->non_lvalue_description
,
1720 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1721 &result
, needs_rvalue
, false,
1722 this->subexpressions
[0]->get_location());
1726 case ast_and_assign
:
1727 case ast_xor_assign
:
1728 case ast_or_assign
: {
1729 this->subexpressions
[0]->set_is_lhs(true);
1730 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1731 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1733 orig_type
= op
[0]->type
;
1734 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1736 if (type
!= orig_type
) {
1737 _mesa_glsl_error(& loc
, state
,
1738 "could not implicitly convert "
1739 "%s to %s", type
->name
, orig_type
->name
);
1740 type
= glsl_type::error_type
;
1743 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1744 type
, op
[0], op
[1]);
1746 do_assignment(instructions
, state
,
1747 this->subexpressions
[0]->non_lvalue_description
,
1748 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1749 &result
, needs_rvalue
, false,
1750 this->subexpressions
[0]->get_location());
1754 case ast_conditional
: {
1755 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1757 * "The ternary selection operator (?:). It operates on three
1758 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1759 * first expression, which must result in a scalar Boolean."
1761 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1762 "condition", &error_emitted
);
1764 /* The :? operator is implemented by generating an anonymous temporary
1765 * followed by an if-statement. The last instruction in each branch of
1766 * the if-statement assigns a value to the anonymous temporary. This
1767 * temporary is the r-value of the expression.
1769 exec_list then_instructions
;
1770 exec_list else_instructions
;
1772 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1773 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1775 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1777 * "The second and third expressions can be any type, as
1778 * long their types match, or there is a conversion in
1779 * Section 4.1.10 "Implicit Conversions" that can be applied
1780 * to one of the expressions to make their types match. This
1781 * resulting matching type is the type of the entire
1784 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1785 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1786 || (op
[1]->type
!= op
[2]->type
)) {
1787 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1789 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1790 "operator must have matching types");
1791 error_emitted
= true;
1792 type
= glsl_type::error_type
;
1797 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1799 * "The second and third expressions must be the same type, but can
1800 * be of any type other than an array."
1802 if (type
->is_array() &&
1803 !state
->check_version(120, 300, &loc
,
1804 "second and third operands of ?: operator "
1805 "cannot be arrays")) {
1806 error_emitted
= true;
1809 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1811 * "Except for array indexing, structure member selection, and
1812 * parentheses, opaque variables are not allowed to be operands in
1813 * expressions; such use results in a compile-time error."
1815 if (type
->contains_opaque()) {
1816 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1817 "of the ?: operator");
1818 error_emitted
= true;
1821 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1823 if (then_instructions
.is_empty()
1824 && else_instructions
.is_empty()
1825 && cond_val
!= NULL
) {
1826 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1828 /* The copy to conditional_tmp reads the whole array. */
1829 if (type
->is_array()) {
1830 mark_whole_array_access(op
[1]);
1831 mark_whole_array_access(op
[2]);
1834 ir_variable
*const tmp
=
1835 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1836 instructions
->push_tail(tmp
);
1838 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1839 instructions
->push_tail(stmt
);
1841 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1842 ir_dereference
*const then_deref
=
1843 new(ctx
) ir_dereference_variable(tmp
);
1844 ir_assignment
*const then_assign
=
1845 new(ctx
) ir_assignment(then_deref
, op
[1]);
1846 stmt
->then_instructions
.push_tail(then_assign
);
1848 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1849 ir_dereference
*const else_deref
=
1850 new(ctx
) ir_dereference_variable(tmp
);
1851 ir_assignment
*const else_assign
=
1852 new(ctx
) ir_assignment(else_deref
, op
[2]);
1853 stmt
->else_instructions
.push_tail(else_assign
);
1855 result
= new(ctx
) ir_dereference_variable(tmp
);
1862 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1863 ? "pre-increment operation" : "pre-decrement operation";
1865 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1866 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1868 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1870 ir_rvalue
*temp_rhs
;
1871 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1875 do_assignment(instructions
, state
,
1876 this->subexpressions
[0]->non_lvalue_description
,
1877 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1878 &result
, needs_rvalue
, false,
1879 this->subexpressions
[0]->get_location());
1884 case ast_post_dec
: {
1885 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1886 ? "post-increment operation" : "post-decrement operation";
1887 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1888 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1890 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1892 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1894 ir_rvalue
*temp_rhs
;
1895 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1898 /* Get a temporary of a copy of the lvalue before it's modified.
1899 * This may get thrown away later.
1901 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1903 ir_rvalue
*junk_rvalue
;
1905 do_assignment(instructions
, state
,
1906 this->subexpressions
[0]->non_lvalue_description
,
1907 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1908 &junk_rvalue
, false, false,
1909 this->subexpressions
[0]->get_location());
1914 case ast_field_selection
:
1915 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1918 case ast_array_index
: {
1919 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1921 /* Getting if an array is being used uninitialized is beyond what we get
1922 * from ir_value.data.assigned. Setting is_lhs as true would force to
1923 * not raise a uninitialized warning when using an array
1925 subexpressions
[0]->set_is_lhs(true);
1926 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1927 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1929 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1932 if (result
->type
->is_error())
1933 error_emitted
= true;
1938 case ast_unsized_array_dim
:
1939 assert(!"ast_unsized_array_dim: Should never get here.");
1942 case ast_function_call
:
1943 /* Should *NEVER* get here. ast_function_call should always be handled
1944 * by ast_function_expression::hir.
1949 case ast_identifier
: {
1950 /* ast_identifier can appear several places in a full abstract syntax
1951 * tree. This particular use must be at location specified in the grammar
1952 * as 'variable_identifier'.
1955 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1958 /* the identifier might be a subroutine name */
1960 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
1961 var
= state
->symbols
->get_variable(sub_name
);
1962 ralloc_free(sub_name
);
1966 var
->data
.used
= true;
1967 result
= new(ctx
) ir_dereference_variable(var
);
1969 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
1971 && result
->variable_referenced()->data
.assigned
!= true
1972 && !is_gl_identifier(var
->name
)) {
1973 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
1974 this->primary_expression
.identifier
);
1977 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1978 this->primary_expression
.identifier
);
1980 result
= ir_rvalue::error_value(ctx
);
1981 error_emitted
= true;
1986 case ast_int_constant
:
1987 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1990 case ast_uint_constant
:
1991 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1994 case ast_float_constant
:
1995 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1998 case ast_bool_constant
:
1999 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2002 case ast_double_constant
:
2003 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2006 case ast_sequence
: {
2007 /* It should not be possible to generate a sequence in the AST without
2008 * any expressions in it.
2010 assert(!this->expressions
.is_empty());
2012 /* The r-value of a sequence is the last expression in the sequence. If
2013 * the other expressions in the sequence do not have side-effects (and
2014 * therefore add instructions to the instruction list), they get dropped
2017 exec_node
*previous_tail
= NULL
;
2018 YYLTYPE previous_operand_loc
= loc
;
2020 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2021 /* If one of the operands of comma operator does not generate any
2022 * code, we want to emit a warning. At each pass through the loop
2023 * previous_tail will point to the last instruction in the stream
2024 * *before* processing the previous operand. Naturally,
2025 * instructions->get_tail_raw() will point to the last instruction in
2026 * the stream *after* processing the previous operand. If the two
2027 * pointers match, then the previous operand had no effect.
2029 * The warning behavior here differs slightly from GCC. GCC will
2030 * only emit a warning if none of the left-hand operands have an
2031 * effect. However, it will emit a warning for each. I believe that
2032 * there are some cases in C (especially with GCC extensions) where
2033 * it is useful to have an intermediate step in a sequence have no
2034 * effect, but I don't think these cases exist in GLSL. Either way,
2035 * it would be a giant hassle to replicate that behavior.
2037 if (previous_tail
== instructions
->get_tail_raw()) {
2038 _mesa_glsl_warning(&previous_operand_loc
, state
,
2039 "left-hand operand of comma expression has "
2043 /* The tail is directly accessed instead of using the get_tail()
2044 * method for performance reasons. get_tail() has extra code to
2045 * return NULL when the list is empty. We don't care about that
2046 * here, so using get_tail_raw() is fine.
2048 previous_tail
= instructions
->get_tail_raw();
2049 previous_operand_loc
= ast
->get_location();
2051 result
= ast
->hir(instructions
, state
);
2054 /* Any errors should have already been emitted in the loop above.
2056 error_emitted
= true;
2060 type
= NULL
; /* use result->type, not type. */
2061 assert(result
!= NULL
|| !needs_rvalue
);
2063 if (result
&& result
->type
->is_error() && !error_emitted
)
2064 _mesa_glsl_error(& loc
, state
, "type mismatch");
2070 ast_expression::has_sequence_subexpression() const
2072 switch (this->oper
) {
2081 return this->subexpressions
[0]->has_sequence_subexpression();
2103 case ast_array_index
:
2104 case ast_mul_assign
:
2105 case ast_div_assign
:
2106 case ast_add_assign
:
2107 case ast_sub_assign
:
2108 case ast_mod_assign
:
2111 case ast_and_assign
:
2112 case ast_xor_assign
:
2114 return this->subexpressions
[0]->has_sequence_subexpression() ||
2115 this->subexpressions
[1]->has_sequence_subexpression();
2117 case ast_conditional
:
2118 return this->subexpressions
[0]->has_sequence_subexpression() ||
2119 this->subexpressions
[1]->has_sequence_subexpression() ||
2120 this->subexpressions
[2]->has_sequence_subexpression();
2125 case ast_field_selection
:
2126 case ast_identifier
:
2127 case ast_int_constant
:
2128 case ast_uint_constant
:
2129 case ast_float_constant
:
2130 case ast_bool_constant
:
2131 case ast_double_constant
:
2137 case ast_function_call
:
2138 unreachable("should be handled by ast_function_expression::hir");
2140 case ast_unsized_array_dim
:
2141 unreachable("ast_unsized_array_dim: Should never get here.");
2148 ast_expression_statement::hir(exec_list
*instructions
,
2149 struct _mesa_glsl_parse_state
*state
)
2151 /* It is possible to have expression statements that don't have an
2152 * expression. This is the solitary semicolon:
2154 * for (i = 0; i < 5; i++)
2157 * In this case the expression will be NULL. Test for NULL and don't do
2158 * anything in that case.
2160 if (expression
!= NULL
)
2161 expression
->hir_no_rvalue(instructions
, state
);
2163 /* Statements do not have r-values.
2170 ast_compound_statement::hir(exec_list
*instructions
,
2171 struct _mesa_glsl_parse_state
*state
)
2174 state
->symbols
->push_scope();
2176 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2177 ast
->hir(instructions
, state
);
2180 state
->symbols
->pop_scope();
2182 /* Compound statements do not have r-values.
2188 * Evaluate the given exec_node (which should be an ast_node representing
2189 * a single array dimension) and return its integer value.
2192 process_array_size(exec_node
*node
,
2193 struct _mesa_glsl_parse_state
*state
)
2195 exec_list dummy_instructions
;
2197 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2200 * Dimensions other than the outermost dimension can by unsized if they
2201 * are immediately sized by a constructor or initializer.
2203 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2206 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2207 YYLTYPE loc
= array_size
->get_location();
2210 _mesa_glsl_error(& loc
, state
,
2211 "array size could not be resolved");
2215 if (!ir
->type
->is_integer()) {
2216 _mesa_glsl_error(& loc
, state
,
2217 "array size must be integer type");
2221 if (!ir
->type
->is_scalar()) {
2222 _mesa_glsl_error(& loc
, state
,
2223 "array size must be scalar type");
2227 ir_constant
*const size
= ir
->constant_expression_value();
2229 (state
->is_version(120, 300) &&
2230 array_size
->has_sequence_subexpression())) {
2231 _mesa_glsl_error(& loc
, state
, "array size must be a "
2232 "constant valued expression");
2236 if (size
->value
.i
[0] <= 0) {
2237 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2241 assert(size
->type
== ir
->type
);
2243 /* If the array size is const (and we've verified that
2244 * it is) then no instructions should have been emitted
2245 * when we converted it to HIR. If they were emitted,
2246 * then either the array size isn't const after all, or
2247 * we are emitting unnecessary instructions.
2249 assert(dummy_instructions
.is_empty());
2251 return size
->value
.u
[0];
2254 static const glsl_type
*
2255 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2256 ast_array_specifier
*array_specifier
,
2257 struct _mesa_glsl_parse_state
*state
)
2259 const glsl_type
*array_type
= base
;
2261 if (array_specifier
!= NULL
) {
2262 if (base
->is_array()) {
2264 /* From page 19 (page 25) of the GLSL 1.20 spec:
2266 * "Only one-dimensional arrays may be declared."
2268 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2269 return glsl_type::error_type
;
2273 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2274 !node
->is_head_sentinel(); node
= node
->prev
) {
2275 unsigned array_size
= process_array_size(node
, state
);
2276 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2284 precision_qualifier_allowed(const glsl_type
*type
)
2286 /* Precision qualifiers apply to floating point, integer and opaque
2289 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2290 * "Any floating point or any integer declaration can have the type
2291 * preceded by one of these precision qualifiers [...] Literal
2292 * constants do not have precision qualifiers. Neither do Boolean
2295 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2298 * "Precision qualifiers are added for code portability with OpenGL
2299 * ES, not for functionality. They have the same syntax as in OpenGL
2302 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2304 * "uniform lowp sampler2D sampler;
2307 * lowp vec4 col = texture2D (sampler, coord);
2308 * // texture2D returns lowp"
2310 * From this, we infer that GLSL 1.30 (and later) should allow precision
2311 * qualifiers on sampler types just like float and integer types.
2313 const glsl_type
*const t
= type
->without_array();
2315 return (t
->is_float() || t
->is_integer() || t
->contains_opaque()) &&
2320 ast_type_specifier::glsl_type(const char **name
,
2321 struct _mesa_glsl_parse_state
*state
) const
2323 const struct glsl_type
*type
;
2325 type
= state
->symbols
->get_type(this->type_name
);
2326 *name
= this->type_name
;
2328 YYLTYPE loc
= this->get_location();
2329 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2335 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2337 * "The precision statement
2339 * precision precision-qualifier type;
2341 * can be used to establish a default precision qualifier. The type field can
2342 * be either int or float or any of the sampler types, (...) If type is float,
2343 * the directive applies to non-precision-qualified floating point type
2344 * (scalar, vector, and matrix) declarations. If type is int, the directive
2345 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2346 * and unsigned) declarations."
2348 * We use the symbol table to keep the values of the default precisions for
2349 * each 'type' in each scope and we use the 'type' string from the precision
2350 * statement as key in the symbol table. When we want to retrieve the default
2351 * precision associated with a given glsl_type we need to know the type string
2352 * associated with it. This is what this function returns.
2355 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2357 switch (type
->base_type
) {
2358 case GLSL_TYPE_FLOAT
:
2360 case GLSL_TYPE_UINT
:
2363 case GLSL_TYPE_ATOMIC_UINT
:
2364 return "atomic_uint";
2365 case GLSL_TYPE_IMAGE
:
2367 case GLSL_TYPE_SAMPLER
: {
2368 const unsigned type_idx
=
2369 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2370 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2371 assert(type_idx
< 4);
2372 switch (type
->sampled_type
) {
2373 case GLSL_TYPE_FLOAT
:
2374 switch (type
->sampler_dimensionality
) {
2375 case GLSL_SAMPLER_DIM_1D
: {
2376 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2377 static const char *const names
[4] = {
2378 "sampler1D", "sampler1DArray",
2379 "sampler1DShadow", "sampler1DArrayShadow"
2381 return names
[type_idx
];
2383 case GLSL_SAMPLER_DIM_2D
: {
2384 static const char *const names
[8] = {
2385 "sampler2D", "sampler2DArray",
2386 "sampler2DShadow", "sampler2DArrayShadow",
2387 "image2D", "image2DArray", NULL
, NULL
2389 return names
[offset
+ type_idx
];
2391 case GLSL_SAMPLER_DIM_3D
: {
2392 static const char *const names
[8] = {
2393 "sampler3D", NULL
, NULL
, NULL
,
2394 "image3D", NULL
, NULL
, NULL
2396 return names
[offset
+ type_idx
];
2398 case GLSL_SAMPLER_DIM_CUBE
: {
2399 static const char *const names
[8] = {
2400 "samplerCube", "samplerCubeArray",
2401 "samplerCubeShadow", "samplerCubeArrayShadow",
2402 "imageCube", NULL
, NULL
, NULL
2404 return names
[offset
+ type_idx
];
2406 case GLSL_SAMPLER_DIM_MS
: {
2407 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2408 static const char *const names
[4] = {
2409 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2411 return names
[type_idx
];
2413 case GLSL_SAMPLER_DIM_RECT
: {
2414 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2415 static const char *const names
[4] = {
2416 "samplerRect", NULL
, "samplerRectShadow", NULL
2418 return names
[type_idx
];
2420 case GLSL_SAMPLER_DIM_BUF
: {
2421 static const char *const names
[8] = {
2422 "samplerBuffer", NULL
, NULL
, NULL
,
2423 "imageBuffer", NULL
, NULL
, NULL
2425 return names
[offset
+ type_idx
];
2427 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2428 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2429 static const char *const names
[4] = {
2430 "samplerExternalOES", NULL
, NULL
, NULL
2432 return names
[type_idx
];
2435 unreachable("Unsupported sampler/image dimensionality");
2436 } /* sampler/image float dimensionality */
2439 switch (type
->sampler_dimensionality
) {
2440 case GLSL_SAMPLER_DIM_1D
: {
2441 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2442 static const char *const names
[4] = {
2443 "isampler1D", "isampler1DArray", NULL
, NULL
2445 return names
[type_idx
];
2447 case GLSL_SAMPLER_DIM_2D
: {
2448 static const char *const names
[8] = {
2449 "isampler2D", "isampler2DArray", NULL
, NULL
,
2450 "iimage2D", "iimage2DArray", NULL
, NULL
2452 return names
[offset
+ type_idx
];
2454 case GLSL_SAMPLER_DIM_3D
: {
2455 static const char *const names
[8] = {
2456 "isampler3D", NULL
, NULL
, NULL
,
2457 "iimage3D", NULL
, NULL
, NULL
2459 return names
[offset
+ type_idx
];
2461 case GLSL_SAMPLER_DIM_CUBE
: {
2462 static const char *const names
[8] = {
2463 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2464 "iimageCube", NULL
, NULL
, NULL
2466 return names
[offset
+ type_idx
];
2468 case GLSL_SAMPLER_DIM_MS
: {
2469 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2470 static const char *const names
[4] = {
2471 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2473 return names
[type_idx
];
2475 case GLSL_SAMPLER_DIM_RECT
: {
2476 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2477 static const char *const names
[4] = {
2478 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2480 return names
[type_idx
];
2482 case GLSL_SAMPLER_DIM_BUF
: {
2483 static const char *const names
[8] = {
2484 "isamplerBuffer", NULL
, NULL
, NULL
,
2485 "iimageBuffer", NULL
, NULL
, NULL
2487 return names
[offset
+ type_idx
];
2490 unreachable("Unsupported isampler/iimage dimensionality");
2491 } /* sampler/image int dimensionality */
2493 case GLSL_TYPE_UINT
:
2494 switch (type
->sampler_dimensionality
) {
2495 case GLSL_SAMPLER_DIM_1D
: {
2496 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2497 static const char *const names
[4] = {
2498 "usampler1D", "usampler1DArray", NULL
, NULL
2500 return names
[type_idx
];
2502 case GLSL_SAMPLER_DIM_2D
: {
2503 static const char *const names
[8] = {
2504 "usampler2D", "usampler2DArray", NULL
, NULL
,
2505 "uimage2D", "uimage2DArray", NULL
, NULL
2507 return names
[offset
+ type_idx
];
2509 case GLSL_SAMPLER_DIM_3D
: {
2510 static const char *const names
[8] = {
2511 "usampler3D", NULL
, NULL
, NULL
,
2512 "uimage3D", NULL
, NULL
, NULL
2514 return names
[offset
+ type_idx
];
2516 case GLSL_SAMPLER_DIM_CUBE
: {
2517 static const char *const names
[8] = {
2518 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2519 "uimageCube", NULL
, NULL
, NULL
2521 return names
[offset
+ type_idx
];
2523 case GLSL_SAMPLER_DIM_MS
: {
2524 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2525 static const char *const names
[4] = {
2526 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2528 return names
[type_idx
];
2530 case GLSL_SAMPLER_DIM_RECT
: {
2531 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2532 static const char *const names
[4] = {
2533 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2535 return names
[type_idx
];
2537 case GLSL_SAMPLER_DIM_BUF
: {
2538 static const char *const names
[8] = {
2539 "usamplerBuffer", NULL
, NULL
, NULL
,
2540 "uimageBuffer", NULL
, NULL
, NULL
2542 return names
[offset
+ type_idx
];
2545 unreachable("Unsupported usampler/uimage dimensionality");
2546 } /* sampler/image uint dimensionality */
2549 unreachable("Unsupported sampler/image type");
2550 } /* sampler/image type */
2552 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2555 unreachable("Unsupported type");
2560 select_gles_precision(unsigned qual_precision
,
2561 const glsl_type
*type
,
2562 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2564 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2565 * In GLES we take the precision from the type qualifier if present,
2566 * otherwise, if the type of the variable allows precision qualifiers at
2567 * all, we look for the default precision qualifier for that type in the
2570 assert(state
->es_shader
);
2572 unsigned precision
= GLSL_PRECISION_NONE
;
2573 if (qual_precision
) {
2574 precision
= qual_precision
;
2575 } else if (precision_qualifier_allowed(type
)) {
2576 const char *type_name
=
2577 get_type_name_for_precision_qualifier(type
->without_array());
2578 assert(type_name
!= NULL
);
2581 state
->symbols
->get_default_precision_qualifier(type_name
);
2582 if (precision
== ast_precision_none
) {
2583 _mesa_glsl_error(loc
, state
,
2584 "No precision specified in this scope for type `%s'",
2592 ast_fully_specified_type::glsl_type(const char **name
,
2593 struct _mesa_glsl_parse_state
*state
) const
2595 return this->specifier
->glsl_type(name
, state
);
2599 * Determine whether a toplevel variable declaration declares a varying. This
2600 * function operates by examining the variable's mode and the shader target,
2601 * so it correctly identifies linkage variables regardless of whether they are
2602 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2604 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2605 * this function will produce undefined results.
2608 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2611 case MESA_SHADER_VERTEX
:
2612 return var
->data
.mode
== ir_var_shader_out
;
2613 case MESA_SHADER_FRAGMENT
:
2614 return var
->data
.mode
== ir_var_shader_in
;
2616 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2622 * Matrix layout qualifiers are only allowed on certain types
2625 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2627 const glsl_type
*type
,
2630 if (var
&& !var
->is_in_buffer_block()) {
2631 /* Layout qualifiers may only apply to interface blocks and fields in
2634 _mesa_glsl_error(loc
, state
,
2635 "uniform block layout qualifiers row_major and "
2636 "column_major may not be applied to variables "
2637 "outside of uniform blocks");
2638 } else if (!type
->without_array()->is_matrix()) {
2639 /* The OpenGL ES 3.0 conformance tests did not originally allow
2640 * matrix layout qualifiers on non-matrices. However, the OpenGL
2641 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2642 * amended to specifically allow these layouts on all types. Emit
2643 * a warning so that people know their code may not be portable.
2645 _mesa_glsl_warning(loc
, state
,
2646 "uniform block layout qualifiers row_major and "
2647 "column_major applied to non-matrix types may "
2648 "be rejected by older compilers");
2653 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2654 struct _mesa_glsl_parse_state
*state
,
2655 unsigned xfb_buffer
) {
2656 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2657 _mesa_glsl_error(loc
, state
,
2658 "invalid xfb_buffer specified %d is larger than "
2659 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2661 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2668 /* From the ARB_enhanced_layouts spec:
2670 * "Variables and block members qualified with *xfb_offset* can be
2671 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2672 * The offset must be a multiple of the size of the first component of
2673 * the first qualified variable or block member, or a compile-time error
2674 * results. Further, if applied to an aggregate containing a double,
2675 * the offset must also be a multiple of 8, and the space taken in the
2676 * buffer will be a multiple of 8.
2679 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2680 struct _mesa_glsl_parse_state
*state
,
2681 int xfb_offset
, const glsl_type
*type
,
2682 unsigned component_size
) {
2683 const glsl_type
*t_without_array
= type
->without_array();
2685 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2686 _mesa_glsl_error(loc
, state
,
2687 "xfb_offset can't be used with unsized arrays.");
2691 /* Make sure nested structs don't contain unsized arrays, and validate
2692 * any xfb_offsets on interface members.
2694 if (t_without_array
->is_record() || t_without_array
->is_interface())
2695 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2696 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2698 /* When the interface block doesn't have an xfb_offset qualifier then
2699 * we apply the component size rules at the member level.
2701 if (xfb_offset
== -1)
2702 component_size
= member_t
->contains_double() ? 8 : 4;
2704 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2705 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2709 /* Nested structs or interface block without offset may not have had an
2710 * offset applied yet so return.
2712 if (xfb_offset
== -1) {
2716 if (xfb_offset
% component_size
) {
2717 _mesa_glsl_error(loc
, state
,
2718 "invalid qualifier xfb_offset=%d must be a multiple "
2719 "of the first component size of the first qualified "
2720 "variable or block member. Or double if an aggregate "
2721 "that contains a double (%d).",
2722 xfb_offset
, component_size
);
2730 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2733 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2734 _mesa_glsl_error(loc
, state
,
2735 "invalid stream specified %d is larger than "
2736 "MAX_VERTEX_STREAMS - 1 (%d).",
2737 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2745 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2748 const glsl_type
*type
,
2749 const ast_type_qualifier
*qual
)
2751 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2752 _mesa_glsl_error(loc
, state
,
2753 "the \"binding\" qualifier only applies to uniforms and "
2754 "shader storage buffer objects");
2758 unsigned qual_binding
;
2759 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2764 const struct gl_context
*const ctx
= state
->ctx
;
2765 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2766 unsigned max_index
= qual_binding
+ elements
- 1;
2767 const glsl_type
*base_type
= type
->without_array();
2769 if (base_type
->is_interface()) {
2770 /* UBOs. From page 60 of the GLSL 4.20 specification:
2771 * "If the binding point for any uniform block instance is less than zero,
2772 * or greater than or equal to the implementation-dependent maximum
2773 * number of uniform buffer bindings, a compilation error will occur.
2774 * When the binding identifier is used with a uniform block instanced as
2775 * an array of size N, all elements of the array from binding through
2776 * binding + N – 1 must be within this range."
2778 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2780 if (qual
->flags
.q
.uniform
&&
2781 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2782 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2783 "the maximum number of UBO binding points (%d)",
2784 qual_binding
, elements
,
2785 ctx
->Const
.MaxUniformBufferBindings
);
2789 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2790 * "If the binding point for any uniform or shader storage block instance
2791 * is less than zero, or greater than or equal to the
2792 * implementation-dependent maximum number of uniform buffer bindings, a
2793 * compile-time error will occur. When the binding identifier is used
2794 * with a uniform or shader storage block instanced as an array of size
2795 * N, all elements of the array from binding through binding + N – 1 must
2796 * be within this range."
2798 if (qual
->flags
.q
.buffer
&&
2799 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2800 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2801 "the maximum number of SSBO binding points (%d)",
2802 qual_binding
, elements
,
2803 ctx
->Const
.MaxShaderStorageBufferBindings
);
2806 } else if (base_type
->is_sampler()) {
2807 /* Samplers. From page 63 of the GLSL 4.20 specification:
2808 * "If the binding is less than zero, or greater than or equal to the
2809 * implementation-dependent maximum supported number of units, a
2810 * compilation error will occur. When the binding identifier is used
2811 * with an array of size N, all elements of the array from binding
2812 * through binding + N - 1 must be within this range."
2814 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2816 if (max_index
>= limit
) {
2817 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2818 "exceeds the maximum number of texture image units "
2819 "(%u)", qual_binding
, elements
, limit
);
2823 } else if (base_type
->contains_atomic()) {
2824 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2825 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2826 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2827 " maximum number of atomic counter buffer bindings"
2828 "(%u)", qual_binding
,
2829 ctx
->Const
.MaxAtomicBufferBindings
);
2833 } else if ((state
->is_version(420, 310) ||
2834 state
->ARB_shading_language_420pack_enable
) &&
2835 base_type
->is_image()) {
2836 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2837 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2838 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2839 " maximum number of image units (%d)", max_index
,
2840 ctx
->Const
.MaxImageUnits
);
2845 _mesa_glsl_error(loc
, state
,
2846 "the \"binding\" qualifier only applies to uniform "
2847 "blocks, opaque variables, or arrays thereof");
2851 var
->data
.explicit_binding
= true;
2852 var
->data
.binding
= qual_binding
;
2859 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
2861 const glsl_interp_mode interpolation
,
2862 const struct ast_type_qualifier
*qual
,
2863 const struct glsl_type
*var_type
,
2864 ir_variable_mode mode
)
2866 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
2867 * not to vertex shader inputs nor fragment shader outputs.
2869 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2870 * "Outputs from a vertex shader (out) and inputs to a fragment
2871 * shader (in) can be further qualified with one or more of these
2872 * interpolation qualifiers"
2874 * "These interpolation qualifiers may only precede the qualifiers in,
2875 * centroid in, out, or centroid out in a declaration. They do not apply
2876 * to the deprecated storage qualifiers varying or centroid
2877 * varying. They also do not apply to inputs into a vertex shader or
2878 * outputs from a fragment shader."
2880 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
2881 * "Outputs from a shader (out) and inputs to a shader (in) can be
2882 * further qualified with one of these interpolation qualifiers."
2884 * "These interpolation qualifiers may only precede the qualifiers
2885 * in, centroid in, out, or centroid out in a declaration. They do
2886 * not apply to inputs into a vertex shader or outputs from a
2889 if (state
->is_version(130, 300)
2890 && interpolation
!= INTERP_MODE_NONE
) {
2891 const char *i
= interpolation_string(interpolation
);
2892 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
2893 _mesa_glsl_error(loc
, state
,
2894 "interpolation qualifier `%s' can only be applied to "
2895 "shader inputs or outputs.", i
);
2897 switch (state
->stage
) {
2898 case MESA_SHADER_VERTEX
:
2899 if (mode
== ir_var_shader_in
) {
2900 _mesa_glsl_error(loc
, state
,
2901 "interpolation qualifier '%s' cannot be applied to "
2902 "vertex shader inputs", i
);
2905 case MESA_SHADER_FRAGMENT
:
2906 if (mode
== ir_var_shader_out
) {
2907 _mesa_glsl_error(loc
, state
,
2908 "interpolation qualifier '%s' cannot be applied to "
2909 "fragment shader outputs", i
);
2917 /* Interpolation qualifiers cannot be applied to 'centroid' and
2918 * 'centroid varying'.
2920 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2921 * "interpolation qualifiers may only precede the qualifiers in,
2922 * centroid in, out, or centroid out in a declaration. They do not apply
2923 * to the deprecated storage qualifiers varying or centroid varying."
2925 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2927 if (state
->is_version(130, 0)
2928 && interpolation
!= INTERP_MODE_NONE
2929 && qual
->flags
.q
.varying
) {
2931 const char *i
= interpolation_string(interpolation
);
2933 if (qual
->flags
.q
.centroid
)
2934 s
= "centroid varying";
2938 _mesa_glsl_error(loc
, state
,
2939 "qualifier '%s' cannot be applied to the "
2940 "deprecated storage qualifier '%s'", i
, s
);
2943 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2944 * so must integer vertex outputs.
2946 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2947 * "Fragment shader inputs that are signed or unsigned integers or
2948 * integer vectors must be qualified with the interpolation qualifier
2951 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2952 * "Fragment shader inputs that are, or contain, signed or unsigned
2953 * integers or integer vectors must be qualified with the
2954 * interpolation qualifier flat."
2956 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2957 * "Vertex shader outputs that are, or contain, signed or unsigned
2958 * integers or integer vectors must be qualified with the
2959 * interpolation qualifier flat."
2961 * Note that prior to GLSL 1.50, this requirement applied to vertex
2962 * outputs rather than fragment inputs. That creates problems in the
2963 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2964 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2965 * apply the restriction to both vertex outputs and fragment inputs.
2967 * Note also that the desktop GLSL specs are missing the text "or
2968 * contain"; this is presumably an oversight, since there is no
2969 * reasonable way to interpolate a fragment shader input that contains
2970 * an integer. See Khronos bug #15671.
2972 if (state
->is_version(130, 300)
2973 && var_type
->contains_integer()
2974 && interpolation
!= INTERP_MODE_FLAT
2975 && ((state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_in
)
2976 || (state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_out
2977 && state
->es_shader
))) {
2978 const char *shader_var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
2979 "vertex output" : "fragment input";
2980 _mesa_glsl_error(loc
, state
, "if a %s is (or contains) "
2981 "an integer, then it must be qualified with 'flat'",
2985 /* Double fragment inputs must be qualified with 'flat'.
2987 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
2988 * "This extension does not support interpolation of double-precision
2989 * values; doubles used as fragment shader inputs must be qualified as
2992 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
2993 * "Fragment shader inputs that are signed or unsigned integers, integer
2994 * vectors, or any double-precision floating-point type must be
2995 * qualified with the interpolation qualifier flat."
2997 * Note that the GLSL specs are missing the text "or contain"; this is
2998 * presumably an oversight. See Khronos bug #15671.
3000 * The 'double' type does not exist in GLSL ES so far.
3002 if (state
->has_double()
3003 && var_type
->contains_double()
3004 && interpolation
!= INTERP_MODE_FLAT
3005 && state
->stage
== MESA_SHADER_FRAGMENT
3006 && mode
== ir_var_shader_in
) {
3007 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3008 "a double, then it must be qualified with 'flat'");
3012 static glsl_interp_mode
3013 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3014 const struct glsl_type
*var_type
,
3015 ir_variable_mode mode
,
3016 struct _mesa_glsl_parse_state
*state
,
3019 glsl_interp_mode interpolation
;
3020 if (qual
->flags
.q
.flat
)
3021 interpolation
= INTERP_MODE_FLAT
;
3022 else if (qual
->flags
.q
.noperspective
)
3023 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3024 else if (qual
->flags
.q
.smooth
)
3025 interpolation
= INTERP_MODE_SMOOTH
;
3026 else if (state
->es_shader
&&
3027 ((mode
== ir_var_shader_in
&&
3028 state
->stage
!= MESA_SHADER_VERTEX
) ||
3029 (mode
== ir_var_shader_out
&&
3030 state
->stage
!= MESA_SHADER_FRAGMENT
)))
3031 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
3033 * "When no interpolation qualifier is present, smooth interpolation
3036 interpolation
= INTERP_MODE_SMOOTH
;
3038 interpolation
= INTERP_MODE_NONE
;
3040 validate_interpolation_qualifier(state
, loc
,
3042 qual
, var_type
, mode
);
3044 return interpolation
;
3049 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3051 struct _mesa_glsl_parse_state
*state
,
3056 unsigned qual_location
;
3057 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3062 /* Checks for GL_ARB_explicit_uniform_location. */
3063 if (qual
->flags
.q
.uniform
) {
3064 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3067 const struct gl_context
*const ctx
= state
->ctx
;
3068 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3070 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3071 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3072 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3073 ctx
->Const
.MaxUserAssignableUniformLocations
);
3077 var
->data
.explicit_location
= true;
3078 var
->data
.location
= qual_location
;
3082 /* Between GL_ARB_explicit_attrib_location an
3083 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3084 * stage can be assigned explicit locations. The checking here associates
3085 * the correct extension with the correct stage's input / output:
3089 * vertex explicit_loc sso
3090 * tess control sso sso
3093 * fragment sso explicit_loc
3095 switch (state
->stage
) {
3096 case MESA_SHADER_VERTEX
:
3097 if (var
->data
.mode
== ir_var_shader_in
) {
3098 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3104 if (var
->data
.mode
== ir_var_shader_out
) {
3105 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3114 case MESA_SHADER_TESS_CTRL
:
3115 case MESA_SHADER_TESS_EVAL
:
3116 case MESA_SHADER_GEOMETRY
:
3117 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3118 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3127 case MESA_SHADER_FRAGMENT
:
3128 if (var
->data
.mode
== ir_var_shader_in
) {
3129 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3135 if (var
->data
.mode
== ir_var_shader_out
) {
3136 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3145 case MESA_SHADER_COMPUTE
:
3146 _mesa_glsl_error(loc
, state
,
3147 "compute shader variables cannot be given "
3148 "explicit locations");
3153 _mesa_glsl_error(loc
, state
,
3154 "%s cannot be given an explicit location in %s shader",
3156 _mesa_shader_stage_to_string(state
->stage
));
3158 var
->data
.explicit_location
= true;
3160 switch (state
->stage
) {
3161 case MESA_SHADER_VERTEX
:
3162 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3163 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3164 : (qual_location
+ VARYING_SLOT_VAR0
);
3167 case MESA_SHADER_TESS_CTRL
:
3168 case MESA_SHADER_TESS_EVAL
:
3169 case MESA_SHADER_GEOMETRY
:
3170 if (var
->data
.patch
)
3171 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3173 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3176 case MESA_SHADER_FRAGMENT
:
3177 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3178 ? (qual_location
+ FRAG_RESULT_DATA0
)
3179 : (qual_location
+ VARYING_SLOT_VAR0
);
3181 case MESA_SHADER_COMPUTE
:
3182 assert(!"Unexpected shader type");
3186 /* Check if index was set for the uniform instead of the function */
3187 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
3188 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3189 "used with subroutine functions");
3193 unsigned qual_index
;
3194 if (qual
->flags
.q
.explicit_index
&&
3195 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3197 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3198 * Layout Qualifiers):
3200 * "It is also a compile-time error if a fragment shader
3201 * sets a layout index to less than 0 or greater than 1."
3203 * Older specifications don't mandate a behavior; we take
3204 * this as a clarification and always generate the error.
3206 if (qual_index
> 1) {
3207 _mesa_glsl_error(loc
, state
,
3208 "explicit index may only be 0 or 1");
3210 var
->data
.explicit_index
= true;
3211 var
->data
.index
= qual_index
;
3218 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3220 struct _mesa_glsl_parse_state
*state
,
3223 const glsl_type
*base_type
= var
->type
->without_array();
3225 if (base_type
->is_image()) {
3226 if (var
->data
.mode
!= ir_var_uniform
&&
3227 var
->data
.mode
!= ir_var_function_in
) {
3228 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3229 "function parameters or uniform-qualified "
3230 "global variables");
3233 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
3234 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
3235 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
3236 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
3237 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
3238 var
->data
.read_only
= true;
3240 if (qual
->flags
.q
.explicit_image_format
) {
3241 if (var
->data
.mode
== ir_var_function_in
) {
3242 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
3243 "used on image function parameters");
3246 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3247 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
3248 "base data type of the image");
3251 var
->data
.image_format
= qual
->image_format
;
3253 if (var
->data
.mode
== ir_var_uniform
) {
3254 if (state
->es_shader
) {
3255 _mesa_glsl_error(loc
, state
, "all image uniforms "
3256 "must have a format layout qualifier");
3258 } else if (!qual
->flags
.q
.write_only
) {
3259 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3260 "`writeonly' must have a format layout "
3265 var
->data
.image_format
= GL_NONE
;
3268 /* From page 70 of the GLSL ES 3.1 specification:
3270 * "Except for image variables qualified with the format qualifiers
3271 * r32f, r32i, and r32ui, image variables must specify either memory
3272 * qualifier readonly or the memory qualifier writeonly."
3274 if (state
->es_shader
&&
3275 var
->data
.image_format
!= GL_R32F
&&
3276 var
->data
.image_format
!= GL_R32I
&&
3277 var
->data
.image_format
!= GL_R32UI
&&
3278 !var
->data
.image_read_only
&&
3279 !var
->data
.image_write_only
) {
3280 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3281 "r32f, r32i or r32ui must be qualified `readonly' or "
3285 } else if (qual
->flags
.q
.read_only
||
3286 qual
->flags
.q
.write_only
||
3287 qual
->flags
.q
.coherent
||
3288 qual
->flags
.q
._volatile
||
3289 qual
->flags
.q
.restrict_flag
||
3290 qual
->flags
.q
.explicit_image_format
) {
3291 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3296 static inline const char*
3297 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3299 if (origin_upper_left
&& pixel_center_integer
)
3300 return "origin_upper_left, pixel_center_integer";
3301 else if (origin_upper_left
)
3302 return "origin_upper_left";
3303 else if (pixel_center_integer
)
3304 return "pixel_center_integer";
3310 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3311 const struct ast_type_qualifier
*qual
)
3313 /* If gl_FragCoord was previously declared, and the qualifiers were
3314 * different in any way, return true.
3316 if (state
->fs_redeclares_gl_fragcoord
) {
3317 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3318 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3325 validate_array_dimensions(const glsl_type
*t
,
3326 struct _mesa_glsl_parse_state
*state
,
3328 if (t
->is_array()) {
3329 t
= t
->fields
.array
;
3330 while (t
->is_array()) {
3331 if (t
->is_unsized_array()) {
3332 _mesa_glsl_error(loc
, state
,
3333 "only the outermost array dimension can "
3338 t
= t
->fields
.array
;
3344 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3346 struct _mesa_glsl_parse_state
*state
,
3349 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3351 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3353 * "Within any shader, the first redeclarations of gl_FragCoord
3354 * must appear before any use of gl_FragCoord."
3356 * Generate a compiler error if above condition is not met by the
3359 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3360 if (earlier
!= NULL
&&
3361 earlier
->data
.used
&&
3362 !state
->fs_redeclares_gl_fragcoord
) {
3363 _mesa_glsl_error(loc
, state
,
3364 "gl_FragCoord used before its first redeclaration "
3365 "in fragment shader");
3368 /* Make sure all gl_FragCoord redeclarations specify the same layout
3371 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3372 const char *const qual_string
=
3373 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3374 qual
->flags
.q
.pixel_center_integer
);
3376 const char *const state_string
=
3377 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3378 state
->fs_pixel_center_integer
);
3380 _mesa_glsl_error(loc
, state
,
3381 "gl_FragCoord redeclared with different layout "
3382 "qualifiers (%s) and (%s) ",
3386 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3387 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3388 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3389 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3390 state
->fs_redeclares_gl_fragcoord
=
3391 state
->fs_origin_upper_left
||
3392 state
->fs_pixel_center_integer
||
3393 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3396 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3397 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3398 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3399 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3400 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3401 ? "origin_upper_left" : "pixel_center_integer";
3403 _mesa_glsl_error(loc
, state
,
3404 "layout qualifier `%s' can only be applied to "
3405 "fragment shader input `gl_FragCoord'",
3409 if (qual
->flags
.q
.explicit_location
) {
3410 apply_explicit_location(qual
, var
, state
, loc
);
3412 if (qual
->flags
.q
.explicit_component
) {
3413 unsigned qual_component
;
3414 if (process_qualifier_constant(state
, loc
, "component",
3415 qual
->component
, &qual_component
)) {
3416 const glsl_type
*type
= var
->type
->without_array();
3417 unsigned components
= type
->component_slots();
3419 if (type
->is_matrix() || type
->is_record()) {
3420 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3421 "cannot be applied to a matrix, a structure, "
3422 "a block, or an array containing any of "
3424 } else if (qual_component
!= 0 &&
3425 (qual_component
+ components
- 1) > 3) {
3426 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3427 (qual_component
+ components
- 1));
3428 } else if (qual_component
== 1 && type
->is_64bit()) {
3429 /* We don't bother checking for 3 as it should be caught by the
3430 * overflow check above.
3432 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3433 "component 1 or 3");
3435 var
->data
.explicit_component
= true;
3436 var
->data
.location_frac
= qual_component
;
3440 } else if (qual
->flags
.q
.explicit_index
) {
3441 if (!qual
->flags
.q
.subroutine_def
)
3442 _mesa_glsl_error(loc
, state
,
3443 "explicit index requires explicit location");
3444 } else if (qual
->flags
.q
.explicit_component
) {
3445 _mesa_glsl_error(loc
, state
,
3446 "explicit component requires explicit location");
3449 if (qual
->flags
.q
.explicit_binding
) {
3450 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3453 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3454 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3455 unsigned qual_stream
;
3456 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3458 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3459 var
->data
.stream
= qual_stream
;
3463 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3464 unsigned qual_xfb_buffer
;
3465 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3466 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3467 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3468 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3469 if (qual
->flags
.q
.explicit_xfb_buffer
)
3470 var
->data
.explicit_xfb_buffer
= true;
3474 if (qual
->flags
.q
.explicit_xfb_offset
) {
3475 unsigned qual_xfb_offset
;
3476 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3478 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3479 qual
->offset
, &qual_xfb_offset
) &&
3480 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3481 var
->type
, component_size
)) {
3482 var
->data
.offset
= qual_xfb_offset
;
3483 var
->data
.explicit_xfb_offset
= true;
3487 if (qual
->flags
.q
.explicit_xfb_stride
) {
3488 unsigned qual_xfb_stride
;
3489 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3490 qual
->xfb_stride
, &qual_xfb_stride
)) {
3491 var
->data
.xfb_stride
= qual_xfb_stride
;
3492 var
->data
.explicit_xfb_stride
= true;
3496 if (var
->type
->contains_atomic()) {
3497 if (var
->data
.mode
== ir_var_uniform
) {
3498 if (var
->data
.explicit_binding
) {
3500 &state
->atomic_counter_offsets
[var
->data
.binding
];
3502 if (*offset
% ATOMIC_COUNTER_SIZE
)
3503 _mesa_glsl_error(loc
, state
,
3504 "misaligned atomic counter offset");
3506 var
->data
.offset
= *offset
;
3507 *offset
+= var
->type
->atomic_size();
3510 _mesa_glsl_error(loc
, state
,
3511 "atomic counters require explicit binding point");
3513 } else if (var
->data
.mode
!= ir_var_function_in
) {
3514 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3515 "function parameters or uniform-qualified "
3516 "global variables");
3520 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3521 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3522 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3523 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3524 * These extensions and all following extensions that add the 'layout'
3525 * keyword have been modified to require the use of 'in' or 'out'.
3527 * The following extension do not allow the deprecated keywords:
3529 * GL_AMD_conservative_depth
3530 * GL_ARB_conservative_depth
3531 * GL_ARB_gpu_shader5
3532 * GL_ARB_separate_shader_objects
3533 * GL_ARB_tessellation_shader
3534 * GL_ARB_transform_feedback3
3535 * GL_ARB_uniform_buffer_object
3537 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3538 * allow layout with the deprecated keywords.
3540 const bool relaxed_layout_qualifier_checking
=
3541 state
->ARB_fragment_coord_conventions_enable
;
3543 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3544 || qual
->flags
.q
.varying
;
3545 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3546 if (relaxed_layout_qualifier_checking
) {
3547 _mesa_glsl_warning(loc
, state
,
3548 "`layout' qualifier may not be used with "
3549 "`attribute' or `varying'");
3551 _mesa_glsl_error(loc
, state
,
3552 "`layout' qualifier may not be used with "
3553 "`attribute' or `varying'");
3557 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3558 * AMD_conservative_depth.
3560 int depth_layout_count
= qual
->flags
.q
.depth_any
3561 + qual
->flags
.q
.depth_greater
3562 + qual
->flags
.q
.depth_less
3563 + qual
->flags
.q
.depth_unchanged
;
3564 if (depth_layout_count
> 0
3565 && !state
->is_version(420, 0)
3566 && !state
->AMD_conservative_depth_enable
3567 && !state
->ARB_conservative_depth_enable
) {
3568 _mesa_glsl_error(loc
, state
,
3569 "extension GL_AMD_conservative_depth or "
3570 "GL_ARB_conservative_depth must be enabled "
3571 "to use depth layout qualifiers");
3572 } else if (depth_layout_count
> 0
3573 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3574 _mesa_glsl_error(loc
, state
,
3575 "depth layout qualifiers can be applied only to "
3577 } else if (depth_layout_count
> 1
3578 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3579 _mesa_glsl_error(loc
, state
,
3580 "at most one depth layout qualifier can be applied to "
3583 if (qual
->flags
.q
.depth_any
)
3584 var
->data
.depth_layout
= ir_depth_layout_any
;
3585 else if (qual
->flags
.q
.depth_greater
)
3586 var
->data
.depth_layout
= ir_depth_layout_greater
;
3587 else if (qual
->flags
.q
.depth_less
)
3588 var
->data
.depth_layout
= ir_depth_layout_less
;
3589 else if (qual
->flags
.q
.depth_unchanged
)
3590 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3592 var
->data
.depth_layout
= ir_depth_layout_none
;
3594 if (qual
->flags
.q
.std140
||
3595 qual
->flags
.q
.std430
||
3596 qual
->flags
.q
.packed
||
3597 qual
->flags
.q
.shared
) {
3598 _mesa_glsl_error(loc
, state
,
3599 "uniform and shader storage block layout qualifiers "
3600 "std140, std430, packed, and shared can only be "
3601 "applied to uniform or shader storage blocks, not "
3605 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3606 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3609 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3612 * "Fragment shaders also allow the following layout qualifier on in only
3613 * (not with variable declarations)
3614 * layout-qualifier-id
3615 * early_fragment_tests
3618 if (qual
->flags
.q
.early_fragment_tests
) {
3619 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3620 "valid in fragment shader input layout declaration.");
3625 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3627 struct _mesa_glsl_parse_state
*state
,
3631 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3633 if (qual
->flags
.q
.invariant
) {
3634 if (var
->data
.used
) {
3635 _mesa_glsl_error(loc
, state
,
3636 "variable `%s' may not be redeclared "
3637 "`invariant' after being used",
3640 var
->data
.invariant
= 1;
3644 if (qual
->flags
.q
.precise
) {
3645 if (var
->data
.used
) {
3646 _mesa_glsl_error(loc
, state
,
3647 "variable `%s' may not be redeclared "
3648 "`precise' after being used",
3651 var
->data
.precise
= 1;
3655 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3656 _mesa_glsl_error(loc
, state
,
3657 "`subroutine' may only be applied to uniforms, "
3658 "subroutine type declarations, or function definitions");
3661 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3662 || qual
->flags
.q
.uniform
3663 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3664 var
->data
.read_only
= 1;
3666 if (qual
->flags
.q
.centroid
)
3667 var
->data
.centroid
= 1;
3669 if (qual
->flags
.q
.sample
)
3670 var
->data
.sample
= 1;
3672 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3673 if (state
->es_shader
) {
3674 var
->data
.precision
=
3675 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3678 if (qual
->flags
.q
.patch
)
3679 var
->data
.patch
= 1;
3681 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3682 var
->type
= glsl_type::error_type
;
3683 _mesa_glsl_error(loc
, state
,
3684 "`attribute' variables may not be declared in the "
3686 _mesa_shader_stage_to_string(state
->stage
));
3689 /* Disallow layout qualifiers which may only appear on layout declarations. */
3690 if (qual
->flags
.q
.prim_type
) {
3691 _mesa_glsl_error(loc
, state
,
3692 "Primitive type may only be specified on GS input or output "
3693 "layout declaration, not on variables.");
3696 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3698 * "However, the const qualifier cannot be used with out or inout."
3700 * The same section of the GLSL 4.40 spec further clarifies this saying:
3702 * "The const qualifier cannot be used with out or inout, or a
3703 * compile-time error results."
3705 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3706 _mesa_glsl_error(loc
, state
,
3707 "`const' may not be applied to `out' or `inout' "
3708 "function parameters");
3711 /* If there is no qualifier that changes the mode of the variable, leave
3712 * the setting alone.
3714 assert(var
->data
.mode
!= ir_var_temporary
);
3715 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3716 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
3717 else if (qual
->flags
.q
.in
)
3718 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3719 else if (qual
->flags
.q
.attribute
3720 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3721 var
->data
.mode
= ir_var_shader_in
;
3722 else if (qual
->flags
.q
.out
)
3723 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3724 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3725 var
->data
.mode
= ir_var_shader_out
;
3726 else if (qual
->flags
.q
.uniform
)
3727 var
->data
.mode
= ir_var_uniform
;
3728 else if (qual
->flags
.q
.buffer
)
3729 var
->data
.mode
= ir_var_shader_storage
;
3730 else if (qual
->flags
.q
.shared_storage
)
3731 var
->data
.mode
= ir_var_shader_shared
;
3733 var
->data
.fb_fetch_output
= state
->stage
== MESA_SHADER_FRAGMENT
&&
3734 qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
3736 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3737 /* User-defined ins/outs are not permitted in compute shaders. */
3738 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3739 _mesa_glsl_error(loc
, state
,
3740 "user-defined input and output variables are not "
3741 "permitted in compute shaders");
3744 /* This variable is being used to link data between shader stages (in
3745 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3746 * that is allowed for such purposes.
3748 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3750 * "The varying qualifier can be used only with the data types
3751 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3754 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3755 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3757 * "Fragment inputs can only be signed and unsigned integers and
3758 * integer vectors, float, floating-point vectors, matrices, or
3759 * arrays of these. Structures cannot be input.
3761 * Similar text exists in the section on vertex shader outputs.
3763 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3764 * 3.00 spec allows structs as well. Varying structs are also allowed
3767 switch (var
->type
->get_scalar_type()->base_type
) {
3768 case GLSL_TYPE_FLOAT
:
3769 /* Ok in all GLSL versions */
3771 case GLSL_TYPE_UINT
:
3773 if (state
->is_version(130, 300))
3775 _mesa_glsl_error(loc
, state
,
3776 "varying variables must be of base type float in %s",
3777 state
->get_version_string());
3779 case GLSL_TYPE_STRUCT
:
3780 if (state
->is_version(150, 300))
3782 _mesa_glsl_error(loc
, state
,
3783 "varying variables may not be of type struct");
3785 case GLSL_TYPE_DOUBLE
:
3788 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3793 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3794 switch (state
->stage
) {
3795 case MESA_SHADER_VERTEX
:
3796 if (var
->data
.mode
== ir_var_shader_out
)
3797 var
->data
.invariant
= true;
3799 case MESA_SHADER_TESS_CTRL
:
3800 case MESA_SHADER_TESS_EVAL
:
3801 case MESA_SHADER_GEOMETRY
:
3802 if ((var
->data
.mode
== ir_var_shader_in
)
3803 || (var
->data
.mode
== ir_var_shader_out
))
3804 var
->data
.invariant
= true;
3806 case MESA_SHADER_FRAGMENT
:
3807 if (var
->data
.mode
== ir_var_shader_in
)
3808 var
->data
.invariant
= true;
3810 case MESA_SHADER_COMPUTE
:
3811 /* Invariance isn't meaningful in compute shaders. */
3816 var
->data
.interpolation
=
3817 interpret_interpolation_qualifier(qual
, var
->type
,
3818 (ir_variable_mode
) var
->data
.mode
,
3821 /* Does the declaration use the deprecated 'attribute' or 'varying'
3824 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3825 || qual
->flags
.q
.varying
;
3828 /* Validate auxiliary storage qualifiers */
3830 /* From section 4.3.4 of the GLSL 1.30 spec:
3831 * "It is an error to use centroid in in a vertex shader."
3833 * From section 4.3.4 of the GLSL ES 3.00 spec:
3834 * "It is an error to use centroid in or interpolation qualifiers in
3835 * a vertex shader input."
3838 /* Section 4.3.6 of the GLSL 1.30 specification states:
3839 * "It is an error to use centroid out in a fragment shader."
3841 * The GL_ARB_shading_language_420pack extension specification states:
3842 * "It is an error to use auxiliary storage qualifiers or interpolation
3843 * qualifiers on an output in a fragment shader."
3845 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3846 _mesa_glsl_error(loc
, state
,
3847 "sample qualifier may only be used on `in` or `out` "
3848 "variables between shader stages");
3850 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3851 _mesa_glsl_error(loc
, state
,
3852 "centroid qualifier may only be used with `in', "
3853 "`out' or `varying' variables between shader stages");
3856 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3857 _mesa_glsl_error(loc
, state
,
3858 "the shared storage qualifiers can only be used with "
3862 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3866 * Get the variable that is being redeclared by this declaration
3868 * Semantic checks to verify the validity of the redeclaration are also
3869 * performed. If semantic checks fail, compilation error will be emitted via
3870 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3873 * A pointer to an existing variable in the current scope if the declaration
3874 * is a redeclaration, \c NULL otherwise.
3876 static ir_variable
*
3877 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3878 struct _mesa_glsl_parse_state
*state
,
3879 bool allow_all_redeclarations
)
3881 /* Check if this declaration is actually a re-declaration, either to
3882 * resize an array or add qualifiers to an existing variable.
3884 * This is allowed for variables in the current scope, or when at
3885 * global scope (for built-ins in the implicit outer scope).
3887 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3888 if (earlier
== NULL
||
3889 (state
->current_function
!= NULL
&&
3890 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3895 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3897 * "It is legal to declare an array without a size and then
3898 * later re-declare the same name as an array of the same
3899 * type and specify a size."
3901 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3902 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3903 /* FINISHME: This doesn't match the qualifiers on the two
3904 * FINISHME: declarations. It's not 100% clear whether this is
3905 * FINISHME: required or not.
3908 const int size
= var
->type
->array_size();
3909 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3910 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3911 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3913 earlier
->data
.max_array_access
);
3916 earlier
->type
= var
->type
;
3919 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3920 state
->is_version(150, 0))
3921 && strcmp(var
->name
, "gl_FragCoord") == 0
3922 && earlier
->type
== var
->type
3923 && var
->data
.mode
== ir_var_shader_in
) {
3924 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3927 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3928 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3930 /* According to section 4.3.7 of the GLSL 1.30 spec,
3931 * the following built-in varaibles can be redeclared with an
3932 * interpolation qualifier:
3935 * * gl_FrontSecondaryColor
3936 * * gl_BackSecondaryColor
3938 * * gl_SecondaryColor
3940 } else if (state
->is_version(130, 0)
3941 && (strcmp(var
->name
, "gl_FrontColor") == 0
3942 || strcmp(var
->name
, "gl_BackColor") == 0
3943 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3944 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3945 || strcmp(var
->name
, "gl_Color") == 0
3946 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3947 && earlier
->type
== var
->type
3948 && earlier
->data
.mode
== var
->data
.mode
) {
3949 earlier
->data
.interpolation
= var
->data
.interpolation
;
3951 /* Layout qualifiers for gl_FragDepth. */
3952 } else if ((state
->is_version(420, 0) ||
3953 state
->AMD_conservative_depth_enable
||
3954 state
->ARB_conservative_depth_enable
)
3955 && strcmp(var
->name
, "gl_FragDepth") == 0
3956 && earlier
->type
== var
->type
3957 && earlier
->data
.mode
== var
->data
.mode
) {
3959 /** From the AMD_conservative_depth spec:
3960 * Within any shader, the first redeclarations of gl_FragDepth
3961 * must appear before any use of gl_FragDepth.
3963 if (earlier
->data
.used
) {
3964 _mesa_glsl_error(&loc
, state
,
3965 "the first redeclaration of gl_FragDepth "
3966 "must appear before any use of gl_FragDepth");
3969 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3970 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3971 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3972 _mesa_glsl_error(&loc
, state
,
3973 "gl_FragDepth: depth layout is declared here "
3974 "as '%s, but it was previously declared as "
3976 depth_layout_string(var
->data
.depth_layout
),
3977 depth_layout_string(earlier
->data
.depth_layout
));
3980 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3982 } else if (state
->has_framebuffer_fetch() &&
3983 strcmp(var
->name
, "gl_LastFragData") == 0 &&
3984 var
->type
== earlier
->type
&&
3985 var
->data
.mode
== ir_var_auto
) {
3986 /* According to the EXT_shader_framebuffer_fetch spec:
3988 * "By default, gl_LastFragData is declared with the mediump precision
3989 * qualifier. This can be changed by redeclaring the corresponding
3990 * variables with the desired precision qualifier."
3992 earlier
->data
.precision
= var
->data
.precision
;
3994 } else if (allow_all_redeclarations
) {
3995 if (earlier
->data
.mode
!= var
->data
.mode
) {
3996 _mesa_glsl_error(&loc
, state
,
3997 "redeclaration of `%s' with incorrect qualifiers",
3999 } else if (earlier
->type
!= var
->type
) {
4000 _mesa_glsl_error(&loc
, state
,
4001 "redeclaration of `%s' has incorrect type",
4005 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4012 * Generate the IR for an initializer in a variable declaration
4015 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4016 ast_fully_specified_type
*type
,
4017 exec_list
*initializer_instructions
,
4018 struct _mesa_glsl_parse_state
*state
)
4020 ir_rvalue
*result
= NULL
;
4022 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4024 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4026 * "All uniform variables are read-only and are initialized either
4027 * directly by an application via API commands, or indirectly by
4030 if (var
->data
.mode
== ir_var_uniform
) {
4031 state
->check_version(120, 0, &initializer_loc
,
4032 "cannot initialize uniform %s",
4036 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4038 * "Buffer variables cannot have initializers."
4040 if (var
->data
.mode
== ir_var_shader_storage
) {
4041 _mesa_glsl_error(&initializer_loc
, state
,
4042 "cannot initialize buffer variable %s",
4046 /* From section 4.1.7 of the GLSL 4.40 spec:
4048 * "Opaque variables [...] are initialized only through the
4049 * OpenGL API; they cannot be declared with an initializer in a
4052 if (var
->type
->contains_opaque()) {
4053 _mesa_glsl_error(&initializer_loc
, state
,
4054 "cannot initialize opaque variable %s",
4058 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4059 _mesa_glsl_error(&initializer_loc
, state
,
4060 "cannot initialize %s shader input / %s %s",
4061 _mesa_shader_stage_to_string(state
->stage
),
4062 (state
->stage
== MESA_SHADER_VERTEX
)
4063 ? "attribute" : "varying",
4067 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4068 _mesa_glsl_error(&initializer_loc
, state
,
4069 "cannot initialize %s shader output %s",
4070 _mesa_shader_stage_to_string(state
->stage
),
4074 /* If the initializer is an ast_aggregate_initializer, recursively store
4075 * type information from the LHS into it, so that its hir() function can do
4078 if (decl
->initializer
->oper
== ast_aggregate
)
4079 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4081 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4082 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4084 /* Calculate the constant value if this is a const or uniform
4087 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4089 * "Declarations of globals without a storage qualifier, or with
4090 * just the const qualifier, may include initializers, in which case
4091 * they will be initialized before the first line of main() is
4092 * executed. Such initializers must be a constant expression."
4094 * The same section of the GLSL ES 3.00.4 spec has similar language.
4096 if (type
->qualifier
.flags
.q
.constant
4097 || type
->qualifier
.flags
.q
.uniform
4098 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4099 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4101 if (new_rhs
!= NULL
) {
4104 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4107 * "A constant expression is one of
4111 * - an expression formed by an operator on operands that are
4112 * all constant expressions, including getting an element of
4113 * a constant array, or a field of a constant structure, or
4114 * components of a constant vector. However, the sequence
4115 * operator ( , ) and the assignment operators ( =, +=, ...)
4116 * are not included in the operators that can create a
4117 * constant expression."
4119 * Section 12.43 (Sequence operator and constant expressions) says:
4121 * "Should the following construct be allowed?
4125 * The expression within the brackets uses the sequence operator
4126 * (',') and returns the integer 3 so the construct is declaring
4127 * a single-dimensional array of size 3. In some languages, the
4128 * construct declares a two-dimensional array. It would be
4129 * preferable to make this construct illegal to avoid confusion.
4131 * One possibility is to change the definition of the sequence
4132 * operator so that it does not return a constant-expression and
4133 * hence cannot be used to declare an array size.
4135 * RESOLUTION: The result of a sequence operator is not a
4136 * constant-expression."
4138 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4139 * contains language almost identical to the section 4.3.3 in the
4140 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4143 ir_constant
*constant_value
= rhs
->constant_expression_value();
4144 if (!constant_value
||
4145 (state
->is_version(430, 300) &&
4146 decl
->initializer
->has_sequence_subexpression())) {
4147 const char *const variable_mode
=
4148 (type
->qualifier
.flags
.q
.constant
)
4150 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4152 /* If ARB_shading_language_420pack is enabled, initializers of
4153 * const-qualified local variables do not have to be constant
4154 * expressions. Const-qualified global variables must still be
4155 * initialized with constant expressions.
4157 if (!state
->has_420pack()
4158 || state
->current_function
== NULL
) {
4159 _mesa_glsl_error(& initializer_loc
, state
,
4160 "initializer of %s variable `%s' must be a "
4161 "constant expression",
4164 if (var
->type
->is_numeric()) {
4165 /* Reduce cascading errors. */
4166 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4167 ? ir_constant::zero(state
, var
->type
) : NULL
;
4171 rhs
= constant_value
;
4172 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4173 ? constant_value
: NULL
;
4176 if (var
->type
->is_numeric()) {
4177 /* Reduce cascading errors. */
4178 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4179 ? ir_constant::zero(state
, var
->type
) : NULL
;
4184 if (rhs
&& !rhs
->type
->is_error()) {
4185 bool temp
= var
->data
.read_only
;
4186 if (type
->qualifier
.flags
.q
.constant
)
4187 var
->data
.read_only
= false;
4189 /* Never emit code to initialize a uniform.
4191 const glsl_type
*initializer_type
;
4192 if (!type
->qualifier
.flags
.q
.uniform
) {
4193 do_assignment(initializer_instructions
, state
,
4198 type
->get_location());
4199 initializer_type
= result
->type
;
4201 initializer_type
= rhs
->type
;
4203 var
->constant_initializer
= rhs
->constant_expression_value();
4204 var
->data
.has_initializer
= true;
4206 /* If the declared variable is an unsized array, it must inherrit
4207 * its full type from the initializer. A declaration such as
4209 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4213 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4215 * The assignment generated in the if-statement (below) will also
4216 * automatically handle this case for non-uniforms.
4218 * If the declared variable is not an array, the types must
4219 * already match exactly. As a result, the type assignment
4220 * here can be done unconditionally. For non-uniforms the call
4221 * to do_assignment can change the type of the initializer (via
4222 * the implicit conversion rules). For uniforms the initializer
4223 * must be a constant expression, and the type of that expression
4224 * was validated above.
4226 var
->type
= initializer_type
;
4228 var
->data
.read_only
= temp
;
4235 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4236 YYLTYPE loc
, ir_variable
*var
,
4237 unsigned num_vertices
,
4239 const char *var_category
)
4241 if (var
->type
->is_unsized_array()) {
4242 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4244 * All geometry shader input unsized array declarations will be
4245 * sized by an earlier input layout qualifier, when present, as per
4246 * the following table.
4248 * Followed by a table mapping each allowed input layout qualifier to
4249 * the corresponding input length.
4251 * Similarly for tessellation control shader outputs.
4253 if (num_vertices
!= 0)
4254 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4257 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4258 * includes the following examples of compile-time errors:
4260 * // code sequence within one shader...
4261 * in vec4 Color1[]; // size unknown
4262 * ...Color1.length()...// illegal, length() unknown
4263 * in vec4 Color2[2]; // size is 2
4264 * ...Color1.length()...// illegal, Color1 still has no size
4265 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4266 * layout(lines) in; // legal, input size is 2, matching
4267 * in vec4 Color4[3]; // illegal, contradicts layout
4270 * To detect the case illustrated by Color3, we verify that the size of
4271 * an explicitly-sized array matches the size of any previously declared
4272 * explicitly-sized array. To detect the case illustrated by Color4, we
4273 * verify that the size of an explicitly-sized array is consistent with
4274 * any previously declared input layout.
4276 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4277 _mesa_glsl_error(&loc
, state
,
4278 "%s size contradicts previously declared layout "
4279 "(size is %u, but layout requires a size of %u)",
4280 var_category
, var
->type
->length
, num_vertices
);
4281 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4282 _mesa_glsl_error(&loc
, state
,
4283 "%s sizes are inconsistent (size is %u, but a "
4284 "previous declaration has size %u)",
4285 var_category
, var
->type
->length
, *size
);
4287 *size
= var
->type
->length
;
4293 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4294 YYLTYPE loc
, ir_variable
*var
)
4296 unsigned num_vertices
= 0;
4298 if (state
->tcs_output_vertices_specified
) {
4299 if (!state
->out_qualifier
->vertices
->
4300 process_qualifier_constant(state
, "vertices",
4301 &num_vertices
, false)) {
4305 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4306 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4307 "GL_MAX_PATCH_VERTICES", num_vertices
);
4312 if (!var
->type
->is_array() && !var
->data
.patch
) {
4313 _mesa_glsl_error(&loc
, state
,
4314 "tessellation control shader outputs must be arrays");
4316 /* To avoid cascading failures, short circuit the checks below. */
4320 if (var
->data
.patch
)
4323 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4324 &state
->tcs_output_size
,
4325 "tessellation control shader output");
4329 * Do additional processing necessary for tessellation control/evaluation shader
4330 * input declarations. This covers both interface block arrays and bare input
4334 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4335 YYLTYPE loc
, ir_variable
*var
)
4337 if (!var
->type
->is_array() && !var
->data
.patch
) {
4338 _mesa_glsl_error(&loc
, state
,
4339 "per-vertex tessellation shader inputs must be arrays");
4340 /* Avoid cascading failures. */
4344 if (var
->data
.patch
)
4347 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
4348 if (var
->type
->is_unsized_array()) {
4349 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4350 state
->Const
.MaxPatchVertices
);
4356 * Do additional processing necessary for geometry shader input declarations
4357 * (this covers both interface blocks arrays and bare input variables).
4360 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4361 YYLTYPE loc
, ir_variable
*var
)
4363 unsigned num_vertices
= 0;
4365 if (state
->gs_input_prim_type_specified
) {
4366 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4369 /* Geometry shader input variables must be arrays. Caller should have
4370 * reported an error for this.
4372 if (!var
->type
->is_array()) {
4373 assert(state
->error
);
4375 /* To avoid cascading failures, short circuit the checks below. */
4379 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4380 &state
->gs_input_size
,
4381 "geometry shader input");
4385 validate_identifier(const char *identifier
, YYLTYPE loc
,
4386 struct _mesa_glsl_parse_state
*state
)
4388 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4390 * "Identifiers starting with "gl_" are reserved for use by
4391 * OpenGL, and may not be declared in a shader as either a
4392 * variable or a function."
4394 if (is_gl_identifier(identifier
)) {
4395 _mesa_glsl_error(&loc
, state
,
4396 "identifier `%s' uses reserved `gl_' prefix",
4398 } else if (strstr(identifier
, "__")) {
4399 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4402 * "In addition, all identifiers containing two
4403 * consecutive underscores (__) are reserved as
4404 * possible future keywords."
4406 * The intention is that names containing __ are reserved for internal
4407 * use by the implementation, and names prefixed with GL_ are reserved
4408 * for use by Khronos. Names simply containing __ are dangerous to use,
4409 * but should be allowed.
4411 * A future version of the GLSL specification will clarify this.
4413 _mesa_glsl_warning(&loc
, state
,
4414 "identifier `%s' uses reserved `__' string",
4420 ast_declarator_list::hir(exec_list
*instructions
,
4421 struct _mesa_glsl_parse_state
*state
)
4424 const struct glsl_type
*decl_type
;
4425 const char *type_name
= NULL
;
4426 ir_rvalue
*result
= NULL
;
4427 YYLTYPE loc
= this->get_location();
4429 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4431 * "To ensure that a particular output variable is invariant, it is
4432 * necessary to use the invariant qualifier. It can either be used to
4433 * qualify a previously declared variable as being invariant
4435 * invariant gl_Position; // make existing gl_Position be invariant"
4437 * In these cases the parser will set the 'invariant' flag in the declarator
4438 * list, and the type will be NULL.
4440 if (this->invariant
) {
4441 assert(this->type
== NULL
);
4443 if (state
->current_function
!= NULL
) {
4444 _mesa_glsl_error(& loc
, state
,
4445 "all uses of `invariant' keyword must be at global "
4449 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4450 assert(decl
->array_specifier
== NULL
);
4451 assert(decl
->initializer
== NULL
);
4453 ir_variable
*const earlier
=
4454 state
->symbols
->get_variable(decl
->identifier
);
4455 if (earlier
== NULL
) {
4456 _mesa_glsl_error(& loc
, state
,
4457 "undeclared variable `%s' cannot be marked "
4458 "invariant", decl
->identifier
);
4459 } else if (!is_varying_var(earlier
, state
->stage
)) {
4460 _mesa_glsl_error(&loc
, state
,
4461 "`%s' cannot be marked invariant; interfaces between "
4462 "shader stages only.", decl
->identifier
);
4463 } else if (earlier
->data
.used
) {
4464 _mesa_glsl_error(& loc
, state
,
4465 "variable `%s' may not be redeclared "
4466 "`invariant' after being used",
4469 earlier
->data
.invariant
= true;
4473 /* Invariant redeclarations do not have r-values.
4478 if (this->precise
) {
4479 assert(this->type
== NULL
);
4481 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4482 assert(decl
->array_specifier
== NULL
);
4483 assert(decl
->initializer
== NULL
);
4485 ir_variable
*const earlier
=
4486 state
->symbols
->get_variable(decl
->identifier
);
4487 if (earlier
== NULL
) {
4488 _mesa_glsl_error(& loc
, state
,
4489 "undeclared variable `%s' cannot be marked "
4490 "precise", decl
->identifier
);
4491 } else if (state
->current_function
!= NULL
&&
4492 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4493 /* Note: we have to check if we're in a function, since
4494 * builtins are treated as having come from another scope.
4496 _mesa_glsl_error(& loc
, state
,
4497 "variable `%s' from an outer scope may not be "
4498 "redeclared `precise' in this scope",
4500 } else if (earlier
->data
.used
) {
4501 _mesa_glsl_error(& loc
, state
,
4502 "variable `%s' may not be redeclared "
4503 "`precise' after being used",
4506 earlier
->data
.precise
= true;
4510 /* Precise redeclarations do not have r-values either. */
4514 assert(this->type
!= NULL
);
4515 assert(!this->invariant
);
4516 assert(!this->precise
);
4518 /* The type specifier may contain a structure definition. Process that
4519 * before any of the variable declarations.
4521 (void) this->type
->specifier
->hir(instructions
, state
);
4523 decl_type
= this->type
->glsl_type(& type_name
, state
);
4525 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4526 * "Buffer variables may only be declared inside interface blocks
4527 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4528 * shader storage blocks. It is a compile-time error to declare buffer
4529 * variables at global scope (outside a block)."
4531 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4532 _mesa_glsl_error(&loc
, state
,
4533 "buffer variables cannot be declared outside "
4534 "interface blocks");
4537 /* An offset-qualified atomic counter declaration sets the default
4538 * offset for the next declaration within the same atomic counter
4541 if (decl_type
&& decl_type
->contains_atomic()) {
4542 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4543 type
->qualifier
.flags
.q
.explicit_offset
) {
4544 unsigned qual_binding
;
4545 unsigned qual_offset
;
4546 if (process_qualifier_constant(state
, &loc
, "binding",
4547 type
->qualifier
.binding
,
4549 && process_qualifier_constant(state
, &loc
, "offset",
4550 type
->qualifier
.offset
,
4552 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4556 ast_type_qualifier allowed_atomic_qual_mask
;
4557 allowed_atomic_qual_mask
.flags
.i
= 0;
4558 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4559 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4560 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4562 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4563 "invalid layout qualifier for",
4567 if (this->declarations
.is_empty()) {
4568 /* If there is no structure involved in the program text, there are two
4569 * possible scenarios:
4571 * - The program text contained something like 'vec4;'. This is an
4572 * empty declaration. It is valid but weird. Emit a warning.
4574 * - The program text contained something like 'S;' and 'S' is not the
4575 * name of a known structure type. This is both invalid and weird.
4578 * - The program text contained something like 'mediump float;'
4579 * when the programmer probably meant 'precision mediump
4580 * float;' Emit a warning with a description of what they
4581 * probably meant to do.
4583 * Note that if decl_type is NULL and there is a structure involved,
4584 * there must have been some sort of error with the structure. In this
4585 * case we assume that an error was already generated on this line of
4586 * code for the structure. There is no need to generate an additional,
4589 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4592 if (decl_type
== NULL
) {
4593 _mesa_glsl_error(&loc
, state
,
4594 "invalid type `%s' in empty declaration",
4597 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4598 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4601 * "... any declaration that leaves the size undefined is
4602 * disallowed as this would add complexity and there are no
4605 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4606 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4607 "or implicitly defined");
4610 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4612 * "The combinations of types and qualifiers that cause
4613 * compile-time or link-time errors are the same whether or not
4614 * the declaration is empty."
4616 validate_array_dimensions(decl_type
, state
, &loc
);
4619 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4620 /* Empty atomic counter declarations are allowed and useful
4621 * to set the default offset qualifier.
4624 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4625 if (this->type
->specifier
->structure
!= NULL
) {
4626 _mesa_glsl_error(&loc
, state
,
4627 "precision qualifiers can't be applied "
4630 static const char *const precision_names
[] = {
4637 _mesa_glsl_warning(&loc
, state
,
4638 "empty declaration with precision "
4639 "qualifier, to set the default precision, "
4640 "use `precision %s %s;'",
4641 precision_names
[this->type
->
4642 qualifier
.precision
],
4645 } else if (this->type
->specifier
->structure
== NULL
) {
4646 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4651 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4652 const struct glsl_type
*var_type
;
4654 const char *identifier
= decl
->identifier
;
4655 /* FINISHME: Emit a warning if a variable declaration shadows a
4656 * FINISHME: declaration at a higher scope.
4659 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4660 if (type_name
!= NULL
) {
4661 _mesa_glsl_error(& loc
, state
,
4662 "invalid type `%s' in declaration of `%s'",
4663 type_name
, decl
->identifier
);
4665 _mesa_glsl_error(& loc
, state
,
4666 "invalid type in declaration of `%s'",
4672 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4676 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4678 _mesa_glsl_error(& loc
, state
,
4679 "invalid type in declaration of `%s'",
4681 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4686 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4689 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4691 /* The 'varying in' and 'varying out' qualifiers can only be used with
4692 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4695 if (this->type
->qualifier
.flags
.q
.varying
) {
4696 if (this->type
->qualifier
.flags
.q
.in
) {
4697 _mesa_glsl_error(& loc
, state
,
4698 "`varying in' qualifier in declaration of "
4699 "`%s' only valid for geometry shaders using "
4700 "ARB_geometry_shader4 or EXT_geometry_shader4",
4702 } else if (this->type
->qualifier
.flags
.q
.out
) {
4703 _mesa_glsl_error(& loc
, state
,
4704 "`varying out' qualifier in declaration of "
4705 "`%s' only valid for geometry shaders using "
4706 "ARB_geometry_shader4 or EXT_geometry_shader4",
4711 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4713 * "Global variables can only use the qualifiers const,
4714 * attribute, uniform, or varying. Only one may be
4717 * Local variables can only use the qualifier const."
4719 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4720 * any extension that adds the 'layout' keyword.
4722 if (!state
->is_version(130, 300)
4723 && !state
->has_explicit_attrib_location()
4724 && !state
->has_separate_shader_objects()
4725 && !state
->ARB_fragment_coord_conventions_enable
) {
4726 if (this->type
->qualifier
.flags
.q
.out
) {
4727 _mesa_glsl_error(& loc
, state
,
4728 "`out' qualifier in declaration of `%s' "
4729 "only valid for function parameters in %s",
4730 decl
->identifier
, state
->get_version_string());
4732 if (this->type
->qualifier
.flags
.q
.in
) {
4733 _mesa_glsl_error(& loc
, state
,
4734 "`in' qualifier in declaration of `%s' "
4735 "only valid for function parameters in %s",
4736 decl
->identifier
, state
->get_version_string());
4738 /* FINISHME: Test for other invalid qualifiers. */
4741 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4743 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4746 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
4747 && (var
->type
->is_numeric() || var
->type
->is_boolean())
4748 && state
->zero_init
) {
4749 const ir_constant_data data
= {0};
4750 var
->data
.has_initializer
= true;
4751 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
4754 if (this->type
->qualifier
.flags
.q
.invariant
) {
4755 if (!is_varying_var(var
, state
->stage
)) {
4756 _mesa_glsl_error(&loc
, state
,
4757 "`%s' cannot be marked invariant; interfaces between "
4758 "shader stages only", var
->name
);
4762 if (state
->current_function
!= NULL
) {
4763 const char *mode
= NULL
;
4764 const char *extra
= "";
4766 /* There is no need to check for 'inout' here because the parser will
4767 * only allow that in function parameter lists.
4769 if (this->type
->qualifier
.flags
.q
.attribute
) {
4771 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4772 mode
= "subroutine uniform";
4773 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4775 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4777 } else if (this->type
->qualifier
.flags
.q
.in
) {
4779 extra
= " or in function parameter list";
4780 } else if (this->type
->qualifier
.flags
.q
.out
) {
4782 extra
= " or in function parameter list";
4786 _mesa_glsl_error(& loc
, state
,
4787 "%s variable `%s' must be declared at "
4789 mode
, var
->name
, extra
);
4791 } else if (var
->data
.mode
== ir_var_shader_in
) {
4792 var
->data
.read_only
= true;
4794 if (state
->stage
== MESA_SHADER_VERTEX
) {
4795 bool error_emitted
= false;
4797 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4799 * "Vertex shader inputs can only be float, floating-point
4800 * vectors, matrices, signed and unsigned integers and integer
4801 * vectors. Vertex shader inputs can also form arrays of these
4802 * types, but not structures."
4804 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4806 * "Vertex shader inputs can only be float, floating-point
4807 * vectors, matrices, signed and unsigned integers and integer
4808 * vectors. They cannot be arrays or structures."
4810 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4812 * "The attribute qualifier can be used only with float,
4813 * floating-point vectors, and matrices. Attribute variables
4814 * cannot be declared as arrays or structures."
4816 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4818 * "Vertex shader inputs can only be float, floating-point
4819 * vectors, matrices, signed and unsigned integers and integer
4820 * vectors. Vertex shader inputs cannot be arrays or
4823 const glsl_type
*check_type
= var
->type
->without_array();
4825 switch (check_type
->base_type
) {
4826 case GLSL_TYPE_FLOAT
:
4828 case GLSL_TYPE_UINT
:
4830 if (state
->is_version(120, 300))
4832 case GLSL_TYPE_DOUBLE
:
4833 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4837 _mesa_glsl_error(& loc
, state
,
4838 "vertex shader input / attribute cannot have "
4840 var
->type
->is_array() ? "array of " : "",
4842 error_emitted
= true;
4845 if (!error_emitted
&& var
->type
->is_array() &&
4846 !state
->check_version(150, 0, &loc
,
4847 "vertex shader input / attribute "
4848 "cannot have array type")) {
4849 error_emitted
= true;
4851 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4852 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4854 * Geometry shader input variables get the per-vertex values
4855 * written out by vertex shader output variables of the same
4856 * names. Since a geometry shader operates on a set of
4857 * vertices, each input varying variable (or input block, see
4858 * interface blocks below) needs to be declared as an array.
4860 if (!var
->type
->is_array()) {
4861 _mesa_glsl_error(&loc
, state
,
4862 "geometry shader inputs must be arrays");
4865 handle_geometry_shader_input_decl(state
, loc
, var
);
4866 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4867 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4869 * It is a compile-time error to declare a fragment shader
4870 * input with, or that contains, any of the following types:
4874 * * An array of arrays
4875 * * An array of structures
4876 * * A structure containing an array
4877 * * A structure containing a structure
4879 if (state
->es_shader
) {
4880 const glsl_type
*check_type
= var
->type
->without_array();
4881 if (check_type
->is_boolean() ||
4882 check_type
->contains_opaque()) {
4883 _mesa_glsl_error(&loc
, state
,
4884 "fragment shader input cannot have type %s",
4887 if (var
->type
->is_array() &&
4888 var
->type
->fields
.array
->is_array()) {
4889 _mesa_glsl_error(&loc
, state
,
4891 "cannot have an array of arrays",
4892 _mesa_shader_stage_to_string(state
->stage
));
4894 if (var
->type
->is_array() &&
4895 var
->type
->fields
.array
->is_record()) {
4896 _mesa_glsl_error(&loc
, state
,
4897 "fragment shader input "
4898 "cannot have an array of structs");
4900 if (var
->type
->is_record()) {
4901 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4902 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4903 var
->type
->fields
.structure
[i
].type
->is_record())
4904 _mesa_glsl_error(&loc
, state
,
4905 "fragement shader input cannot have "
4906 "a struct that contains an "
4911 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4912 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4913 handle_tess_shader_input_decl(state
, loc
, var
);
4915 } else if (var
->data
.mode
== ir_var_shader_out
) {
4916 const glsl_type
*check_type
= var
->type
->without_array();
4918 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4920 * It is a compile-time error to declare a vertex, tessellation
4921 * evaluation, tessellation control, or geometry shader output
4922 * that contains any of the following:
4924 * * A Boolean type (bool, bvec2 ...)
4927 if (check_type
->is_boolean() || check_type
->contains_opaque())
4928 _mesa_glsl_error(&loc
, state
,
4929 "%s shader output cannot have type %s",
4930 _mesa_shader_stage_to_string(state
->stage
),
4933 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4935 * It is a compile-time error to declare a fragment shader output
4936 * that contains any of the following:
4938 * * A Boolean type (bool, bvec2 ...)
4939 * * A double-precision scalar or vector (double, dvec2 ...)
4944 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4945 if (check_type
->is_record() || check_type
->is_matrix())
4946 _mesa_glsl_error(&loc
, state
,
4947 "fragment shader output "
4948 "cannot have struct or matrix type");
4949 switch (check_type
->base_type
) {
4950 case GLSL_TYPE_UINT
:
4952 case GLSL_TYPE_FLOAT
:
4955 _mesa_glsl_error(&loc
, state
,
4956 "fragment shader output cannot have "
4957 "type %s", check_type
->name
);
4961 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4963 * It is a compile-time error to declare a vertex shader output
4964 * with, or that contains, any of the following types:
4968 * * An array of arrays
4969 * * An array of structures
4970 * * A structure containing an array
4971 * * A structure containing a structure
4973 * It is a compile-time error to declare a fragment shader output
4974 * with, or that contains, any of the following types:
4980 * * An array of array
4982 if (state
->es_shader
) {
4983 if (var
->type
->is_array() &&
4984 var
->type
->fields
.array
->is_array()) {
4985 _mesa_glsl_error(&loc
, state
,
4987 "cannot have an array of arrays",
4988 _mesa_shader_stage_to_string(state
->stage
));
4990 if (state
->stage
== MESA_SHADER_VERTEX
) {
4991 if (var
->type
->is_array() &&
4992 var
->type
->fields
.array
->is_record()) {
4993 _mesa_glsl_error(&loc
, state
,
4994 "vertex shader output "
4995 "cannot have an array of structs");
4997 if (var
->type
->is_record()) {
4998 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4999 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5000 var
->type
->fields
.structure
[i
].type
->is_record())
5001 _mesa_glsl_error(&loc
, state
,
5002 "vertex shader output cannot have a "
5003 "struct that contains an "
5010 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5011 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5013 } else if (var
->type
->contains_subroutine()) {
5014 /* declare subroutine uniforms as hidden */
5015 var
->data
.how_declared
= ir_var_hidden
;
5018 /* From section 4.3.4 of the GLSL 4.00 spec:
5019 * "Input variables may not be declared using the patch in qualifier
5020 * in tessellation control or geometry shaders."
5022 * From section 4.3.6 of the GLSL 4.00 spec:
5023 * "It is an error to use patch out in a vertex, tessellation
5024 * evaluation, or geometry shader."
5026 * This doesn't explicitly forbid using them in a fragment shader, but
5027 * that's probably just an oversight.
5029 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5030 && this->type
->qualifier
.flags
.q
.patch
5031 && this->type
->qualifier
.flags
.q
.in
) {
5033 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5034 "tessellation evaluation shader");
5037 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5038 && this->type
->qualifier
.flags
.q
.patch
5039 && this->type
->qualifier
.flags
.q
.out
) {
5041 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5042 "tessellation control shader");
5045 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5047 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5048 state
->check_precision_qualifiers_allowed(&loc
);
5051 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5052 !precision_qualifier_allowed(var
->type
)) {
5053 _mesa_glsl_error(&loc
, state
,
5054 "precision qualifiers apply only to floating point"
5055 ", integer and opaque types");
5058 /* From section 4.1.7 of the GLSL 4.40 spec:
5060 * "[Opaque types] can only be declared as function
5061 * parameters or uniform-qualified variables."
5063 if (var_type
->contains_opaque() &&
5064 !this->type
->qualifier
.flags
.q
.uniform
) {
5065 _mesa_glsl_error(&loc
, state
,
5066 "opaque variables must be declared uniform");
5069 /* Process the initializer and add its instructions to a temporary
5070 * list. This list will be added to the instruction stream (below) after
5071 * the declaration is added. This is done because in some cases (such as
5072 * redeclarations) the declaration may not actually be added to the
5073 * instruction stream.
5075 exec_list initializer_instructions
;
5077 /* Examine var name here since var may get deleted in the next call */
5078 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5080 ir_variable
*earlier
=
5081 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5082 false /* allow_all_redeclarations */);
5083 if (earlier
!= NULL
) {
5085 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
5086 _mesa_glsl_error(&loc
, state
,
5087 "`%s' has already been redeclared using "
5088 "gl_PerVertex", earlier
->name
);
5090 earlier
->data
.how_declared
= ir_var_declared_normally
;
5093 if (decl
->initializer
!= NULL
) {
5094 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
5096 &initializer_instructions
, state
);
5098 validate_array_dimensions(var_type
, state
, &loc
);
5101 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5103 * "It is an error to write to a const variable outside of
5104 * its declaration, so they must be initialized when
5107 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5108 _mesa_glsl_error(& loc
, state
,
5109 "const declaration of `%s' must be initialized",
5113 if (state
->es_shader
) {
5114 const glsl_type
*const t
= (earlier
== NULL
)
5115 ? var
->type
: earlier
->type
;
5117 if (t
->is_unsized_array())
5118 /* Section 10.17 of the GLSL ES 1.00 specification states that
5119 * unsized array declarations have been removed from the language.
5120 * Arrays that are sized using an initializer are still explicitly
5121 * sized. However, GLSL ES 1.00 does not allow array
5122 * initializers. That is only allowed in GLSL ES 3.00.
5124 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5126 * "An array type can also be formed without specifying a size
5127 * if the definition includes an initializer:
5129 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5130 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5135 _mesa_glsl_error(& loc
, state
,
5136 "unsized array declarations are not allowed in "
5140 /* If the declaration is not a redeclaration, there are a few additional
5141 * semantic checks that must be applied. In addition, variable that was
5142 * created for the declaration should be added to the IR stream.
5144 if (earlier
== NULL
) {
5145 validate_identifier(decl
->identifier
, loc
, state
);
5147 /* Add the variable to the symbol table. Note that the initializer's
5148 * IR was already processed earlier (though it hasn't been emitted
5149 * yet), without the variable in scope.
5151 * This differs from most C-like languages, but it follows the GLSL
5152 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5155 * "Within a declaration, the scope of a name starts immediately
5156 * after the initializer if present or immediately after the name
5157 * being declared if not."
5159 if (!state
->symbols
->add_variable(var
)) {
5160 YYLTYPE loc
= this->get_location();
5161 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5162 "current scope", decl
->identifier
);
5166 /* Push the variable declaration to the top. It means that all the
5167 * variable declarations will appear in a funny last-to-first order,
5168 * but otherwise we run into trouble if a function is prototyped, a
5169 * global var is decled, then the function is defined with usage of
5170 * the global var. See glslparsertest's CorrectModule.frag.
5172 instructions
->push_head(var
);
5175 instructions
->append_list(&initializer_instructions
);
5179 /* Generally, variable declarations do not have r-values. However,
5180 * one is used for the declaration in
5182 * while (bool b = some_condition()) {
5186 * so we return the rvalue from the last seen declaration here.
5193 ast_parameter_declarator::hir(exec_list
*instructions
,
5194 struct _mesa_glsl_parse_state
*state
)
5197 const struct glsl_type
*type
;
5198 const char *name
= NULL
;
5199 YYLTYPE loc
= this->get_location();
5201 type
= this->type
->glsl_type(& name
, state
);
5205 _mesa_glsl_error(& loc
, state
,
5206 "invalid type `%s' in declaration of `%s'",
5207 name
, this->identifier
);
5209 _mesa_glsl_error(& loc
, state
,
5210 "invalid type in declaration of `%s'",
5214 type
= glsl_type::error_type
;
5217 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5219 * "Functions that accept no input arguments need not use void in the
5220 * argument list because prototypes (or definitions) are required and
5221 * therefore there is no ambiguity when an empty argument list "( )" is
5222 * declared. The idiom "(void)" as a parameter list is provided for
5225 * Placing this check here prevents a void parameter being set up
5226 * for a function, which avoids tripping up checks for main taking
5227 * parameters and lookups of an unnamed symbol.
5229 if (type
->is_void()) {
5230 if (this->identifier
!= NULL
)
5231 _mesa_glsl_error(& loc
, state
,
5232 "named parameter cannot have type `void'");
5238 if (formal_parameter
&& (this->identifier
== NULL
)) {
5239 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5243 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5244 * call already handled the "vec4[..] foo" case.
5246 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5248 if (!type
->is_error() && type
->is_unsized_array()) {
5249 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5251 type
= glsl_type::error_type
;
5255 ir_variable
*var
= new(ctx
)
5256 ir_variable(type
, this->identifier
, ir_var_function_in
);
5258 /* Apply any specified qualifiers to the parameter declaration. Note that
5259 * for function parameters the default mode is 'in'.
5261 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5264 /* From section 4.1.7 of the GLSL 4.40 spec:
5266 * "Opaque variables cannot be treated as l-values; hence cannot
5267 * be used as out or inout function parameters, nor can they be
5270 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5271 && type
->contains_opaque()) {
5272 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5273 "contain opaque variables");
5274 type
= glsl_type::error_type
;
5277 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5279 * "When calling a function, expressions that do not evaluate to
5280 * l-values cannot be passed to parameters declared as out or inout."
5282 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5284 * "Other binary or unary expressions, non-dereferenced arrays,
5285 * function names, swizzles with repeated fields, and constants
5286 * cannot be l-values."
5288 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5289 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5291 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5293 && !state
->check_version(120, 100, &loc
,
5294 "arrays cannot be out or inout parameters")) {
5295 type
= glsl_type::error_type
;
5298 instructions
->push_tail(var
);
5300 /* Parameter declarations do not have r-values.
5307 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5309 exec_list
*ir_parameters
,
5310 _mesa_glsl_parse_state
*state
)
5312 ast_parameter_declarator
*void_param
= NULL
;
5315 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5316 param
->formal_parameter
= formal
;
5317 param
->hir(ir_parameters
, state
);
5325 if ((void_param
!= NULL
) && (count
> 1)) {
5326 YYLTYPE loc
= void_param
->get_location();
5328 _mesa_glsl_error(& loc
, state
,
5329 "`void' parameter must be only parameter");
5335 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5337 /* IR invariants disallow function declarations or definitions
5338 * nested within other function definitions. But there is no
5339 * requirement about the relative order of function declarations
5340 * and definitions with respect to one another. So simply insert
5341 * the new ir_function block at the end of the toplevel instruction
5344 state
->toplevel_ir
->push_tail(f
);
5349 ast_function::hir(exec_list
*instructions
,
5350 struct _mesa_glsl_parse_state
*state
)
5353 ir_function
*f
= NULL
;
5354 ir_function_signature
*sig
= NULL
;
5355 exec_list hir_parameters
;
5356 YYLTYPE loc
= this->get_location();
5358 const char *const name
= identifier
;
5360 /* New functions are always added to the top-level IR instruction stream,
5361 * so this instruction list pointer is ignored. See also emit_function
5364 (void) instructions
;
5366 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5368 * "Function declarations (prototypes) cannot occur inside of functions;
5369 * they must be at global scope, or for the built-in functions, outside
5370 * the global scope."
5372 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5374 * "User defined functions may only be defined within the global scope."
5376 * Note that this language does not appear in GLSL 1.10.
5378 if ((state
->current_function
!= NULL
) &&
5379 state
->is_version(120, 100)) {
5380 YYLTYPE loc
= this->get_location();
5381 _mesa_glsl_error(&loc
, state
,
5382 "declaration of function `%s' not allowed within "
5383 "function body", name
);
5386 validate_identifier(name
, this->get_location(), state
);
5388 /* Convert the list of function parameters to HIR now so that they can be
5389 * used below to compare this function's signature with previously seen
5390 * signatures for functions with the same name.
5392 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5394 & hir_parameters
, state
);
5396 const char *return_type_name
;
5397 const glsl_type
*return_type
=
5398 this->return_type
->glsl_type(& return_type_name
, state
);
5401 YYLTYPE loc
= this->get_location();
5402 _mesa_glsl_error(&loc
, state
,
5403 "function `%s' has undeclared return type `%s'",
5404 name
, return_type_name
);
5405 return_type
= glsl_type::error_type
;
5408 /* ARB_shader_subroutine states:
5409 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5410 * subroutine(...) to a function declaration."
5412 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5413 YYLTYPE loc
= this->get_location();
5414 _mesa_glsl_error(&loc
, state
,
5415 "function declaration `%s' cannot have subroutine prepended",
5419 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5420 * "No qualifier is allowed on the return type of a function."
5422 if (this->return_type
->has_qualifiers(state
)) {
5423 YYLTYPE loc
= this->get_location();
5424 _mesa_glsl_error(& loc
, state
,
5425 "function `%s' return type has qualifiers", name
);
5428 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5430 * "Arrays are allowed as arguments and as the return type. In both
5431 * cases, the array must be explicitly sized."
5433 if (return_type
->is_unsized_array()) {
5434 YYLTYPE loc
= this->get_location();
5435 _mesa_glsl_error(& loc
, state
,
5436 "function `%s' return type array must be explicitly "
5440 /* From section 4.1.7 of the GLSL 4.40 spec:
5442 * "[Opaque types] can only be declared as function parameters
5443 * or uniform-qualified variables."
5445 if (return_type
->contains_opaque()) {
5446 YYLTYPE loc
= this->get_location();
5447 _mesa_glsl_error(&loc
, state
,
5448 "function `%s' return type can't contain an opaque type",
5453 if (return_type
->is_subroutine()) {
5454 YYLTYPE loc
= this->get_location();
5455 _mesa_glsl_error(&loc
, state
,
5456 "function `%s' return type can't be a subroutine type",
5461 /* Create an ir_function if one doesn't already exist. */
5462 f
= state
->symbols
->get_function(name
);
5464 f
= new(ctx
) ir_function(name
);
5465 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5466 if (!state
->symbols
->add_function(f
)) {
5467 /* This function name shadows a non-function use of the same name. */
5468 YYLTYPE loc
= this->get_location();
5469 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5470 "non-function", name
);
5474 emit_function(state
, f
);
5477 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5479 * "A shader cannot redefine or overload built-in functions."
5481 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5483 * "User code can overload the built-in functions but cannot redefine
5486 if (state
->es_shader
&& state
->language_version
>= 300) {
5487 /* Local shader has no exact candidates; check the built-ins. */
5488 _mesa_glsl_initialize_builtin_functions();
5489 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5490 YYLTYPE loc
= this->get_location();
5491 _mesa_glsl_error(& loc
, state
,
5492 "A shader cannot redefine or overload built-in "
5493 "function `%s' in GLSL ES 3.00", name
);
5498 /* Verify that this function's signature either doesn't match a previously
5499 * seen signature for a function with the same name, or, if a match is found,
5500 * that the previously seen signature does not have an associated definition.
5502 if (state
->es_shader
|| f
->has_user_signature()) {
5503 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5505 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5506 if (badvar
!= NULL
) {
5507 YYLTYPE loc
= this->get_location();
5509 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5510 "qualifiers don't match prototype", name
, badvar
);
5513 if (sig
->return_type
!= return_type
) {
5514 YYLTYPE loc
= this->get_location();
5516 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5517 "match prototype", name
);
5520 if (sig
->is_defined
) {
5521 if (is_definition
) {
5522 YYLTYPE loc
= this->get_location();
5523 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5525 /* We just encountered a prototype that exactly matches a
5526 * function that's already been defined. This is redundant,
5527 * and we should ignore it.
5535 /* Verify the return type of main() */
5536 if (strcmp(name
, "main") == 0) {
5537 if (! return_type
->is_void()) {
5538 YYLTYPE loc
= this->get_location();
5540 _mesa_glsl_error(& loc
, state
, "main() must return void");
5543 if (!hir_parameters
.is_empty()) {
5544 YYLTYPE loc
= this->get_location();
5546 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5550 /* Finish storing the information about this new function in its signature.
5553 sig
= new(ctx
) ir_function_signature(return_type
);
5554 f
->add_signature(sig
);
5557 sig
->replace_parameters(&hir_parameters
);
5560 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5563 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5564 unsigned qual_index
;
5565 if (process_qualifier_constant(state
, &loc
, "index",
5566 this->return_type
->qualifier
.index
,
5568 if (!state
->has_explicit_uniform_location()) {
5569 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5570 "GL_ARB_explicit_uniform_location or "
5572 } else if (qual_index
>= MAX_SUBROUTINES
) {
5573 _mesa_glsl_error(&loc
, state
,
5574 "invalid subroutine index (%d) index must "
5575 "be a number between 0 and "
5576 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5577 MAX_SUBROUTINES
- 1);
5579 f
->subroutine_index
= qual_index
;
5584 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5585 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5586 f
->num_subroutine_types
);
5588 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5589 const struct glsl_type
*type
;
5590 /* the subroutine type must be already declared */
5591 type
= state
->symbols
->get_type(decl
->identifier
);
5593 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5596 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5597 ir_function
*fn
= state
->subroutine_types
[i
];
5598 ir_function_signature
*tsig
= NULL
;
5600 if (strcmp(fn
->name
, decl
->identifier
))
5603 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5606 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5608 if (tsig
->return_type
!= sig
->return_type
) {
5609 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5613 f
->subroutine_types
[idx
++] = type
;
5615 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5617 state
->num_subroutines
+ 1);
5618 state
->subroutines
[state
->num_subroutines
] = f
;
5619 state
->num_subroutines
++;
5623 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5624 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5625 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5628 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5630 state
->num_subroutine_types
+ 1);
5631 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5632 state
->num_subroutine_types
++;
5634 f
->is_subroutine
= true;
5637 /* Function declarations (prototypes) do not have r-values.
5644 ast_function_definition::hir(exec_list
*instructions
,
5645 struct _mesa_glsl_parse_state
*state
)
5647 prototype
->is_definition
= true;
5648 prototype
->hir(instructions
, state
);
5650 ir_function_signature
*signature
= prototype
->signature
;
5651 if (signature
== NULL
)
5654 assert(state
->current_function
== NULL
);
5655 state
->current_function
= signature
;
5656 state
->found_return
= false;
5658 /* Duplicate parameters declared in the prototype as concrete variables.
5659 * Add these to the symbol table.
5661 state
->symbols
->push_scope();
5662 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5663 assert(var
->as_variable() != NULL
);
5665 /* The only way a parameter would "exist" is if two parameters have
5668 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5669 YYLTYPE loc
= this->get_location();
5671 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5673 state
->symbols
->add_variable(var
);
5677 /* Convert the body of the function to HIR. */
5678 this->body
->hir(&signature
->body
, state
);
5679 signature
->is_defined
= true;
5681 state
->symbols
->pop_scope();
5683 assert(state
->current_function
== signature
);
5684 state
->current_function
= NULL
;
5686 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5687 YYLTYPE loc
= this->get_location();
5688 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5689 "%s, but no return statement",
5690 signature
->function_name(),
5691 signature
->return_type
->name
);
5694 /* Function definitions do not have r-values.
5701 ast_jump_statement::hir(exec_list
*instructions
,
5702 struct _mesa_glsl_parse_state
*state
)
5709 assert(state
->current_function
);
5711 if (opt_return_value
) {
5712 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5714 /* The value of the return type can be NULL if the shader says
5715 * 'return foo();' and foo() is a function that returns void.
5717 * NOTE: The GLSL spec doesn't say that this is an error. The type
5718 * of the return value is void. If the return type of the function is
5719 * also void, then this should compile without error. Seriously.
5721 const glsl_type
*const ret_type
=
5722 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5724 /* Implicit conversions are not allowed for return values prior to
5725 * ARB_shading_language_420pack.
5727 if (state
->current_function
->return_type
!= ret_type
) {
5728 YYLTYPE loc
= this->get_location();
5730 if (state
->has_420pack()) {
5731 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5733 _mesa_glsl_error(& loc
, state
,
5734 "could not implicitly convert return value "
5735 "to %s, in function `%s'",
5736 state
->current_function
->return_type
->name
,
5737 state
->current_function
->function_name());
5740 _mesa_glsl_error(& loc
, state
,
5741 "`return' with wrong type %s, in function `%s' "
5744 state
->current_function
->function_name(),
5745 state
->current_function
->return_type
->name
);
5747 } else if (state
->current_function
->return_type
->base_type
==
5749 YYLTYPE loc
= this->get_location();
5751 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5752 * specs add a clarification:
5754 * "A void function can only use return without a return argument, even if
5755 * the return argument has void type. Return statements only accept values:
5758 * void func2() { return func1(); } // illegal return statement"
5760 _mesa_glsl_error(& loc
, state
,
5761 "void functions can only use `return' without a "
5765 inst
= new(ctx
) ir_return(ret
);
5767 if (state
->current_function
->return_type
->base_type
!=
5769 YYLTYPE loc
= this->get_location();
5771 _mesa_glsl_error(& loc
, state
,
5772 "`return' with no value, in function %s returning "
5774 state
->current_function
->function_name());
5776 inst
= new(ctx
) ir_return
;
5779 state
->found_return
= true;
5780 instructions
->push_tail(inst
);
5785 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5786 YYLTYPE loc
= this->get_location();
5788 _mesa_glsl_error(& loc
, state
,
5789 "`discard' may only appear in a fragment shader");
5791 instructions
->push_tail(new(ctx
) ir_discard
);
5796 if (mode
== ast_continue
&&
5797 state
->loop_nesting_ast
== NULL
) {
5798 YYLTYPE loc
= this->get_location();
5800 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5801 } else if (mode
== ast_break
&&
5802 state
->loop_nesting_ast
== NULL
&&
5803 state
->switch_state
.switch_nesting_ast
== NULL
) {
5804 YYLTYPE loc
= this->get_location();
5806 _mesa_glsl_error(& loc
, state
,
5807 "break may only appear in a loop or a switch");
5809 /* For a loop, inline the for loop expression again, since we don't
5810 * know where near the end of the loop body the normal copy of it is
5811 * going to be placed. Same goes for the condition for a do-while
5814 if (state
->loop_nesting_ast
!= NULL
&&
5815 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5816 if (state
->loop_nesting_ast
->rest_expression
) {
5817 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5820 if (state
->loop_nesting_ast
->mode
==
5821 ast_iteration_statement::ast_do_while
) {
5822 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5826 if (state
->switch_state
.is_switch_innermost
&&
5827 mode
== ast_continue
) {
5828 /* Set 'continue_inside' to true. */
5829 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5830 ir_dereference_variable
*deref_continue_inside_var
=
5831 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5832 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5835 /* Break out from the switch, continue for the loop will
5836 * be called right after switch. */
5837 ir_loop_jump
*const jump
=
5838 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5839 instructions
->push_tail(jump
);
5841 } else if (state
->switch_state
.is_switch_innermost
&&
5842 mode
== ast_break
) {
5843 /* Force break out of switch by inserting a break. */
5844 ir_loop_jump
*const jump
=
5845 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5846 instructions
->push_tail(jump
);
5848 ir_loop_jump
*const jump
=
5849 new(ctx
) ir_loop_jump((mode
== ast_break
)
5850 ? ir_loop_jump::jump_break
5851 : ir_loop_jump::jump_continue
);
5852 instructions
->push_tail(jump
);
5859 /* Jump instructions do not have r-values.
5866 ast_selection_statement::hir(exec_list
*instructions
,
5867 struct _mesa_glsl_parse_state
*state
)
5871 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5873 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5875 * "Any expression whose type evaluates to a Boolean can be used as the
5876 * conditional expression bool-expression. Vector types are not accepted
5877 * as the expression to if."
5879 * The checks are separated so that higher quality diagnostics can be
5880 * generated for cases where both rules are violated.
5882 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5883 YYLTYPE loc
= this->condition
->get_location();
5885 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5889 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5891 if (then_statement
!= NULL
) {
5892 state
->symbols
->push_scope();
5893 then_statement
->hir(& stmt
->then_instructions
, state
);
5894 state
->symbols
->pop_scope();
5897 if (else_statement
!= NULL
) {
5898 state
->symbols
->push_scope();
5899 else_statement
->hir(& stmt
->else_instructions
, state
);
5900 state
->symbols
->pop_scope();
5903 instructions
->push_tail(stmt
);
5905 /* if-statements do not have r-values.
5911 /* Used for detection of duplicate case values, compare
5912 * given contents directly.
5915 compare_case_value(const void *a
, const void *b
)
5917 return *(unsigned *) a
== *(unsigned *) b
;
5921 /* Used for detection of duplicate case values, just
5922 * returns key contents as is.
5925 key_contents(const void *key
)
5927 return *(unsigned *) key
;
5932 ast_switch_statement::hir(exec_list
*instructions
,
5933 struct _mesa_glsl_parse_state
*state
)
5937 ir_rvalue
*const test_expression
=
5938 this->test_expression
->hir(instructions
, state
);
5940 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5942 * "The type of init-expression in a switch statement must be a
5945 if (!test_expression
->type
->is_scalar() ||
5946 !test_expression
->type
->is_integer()) {
5947 YYLTYPE loc
= this->test_expression
->get_location();
5949 _mesa_glsl_error(& loc
,
5951 "switch-statement expression must be scalar "
5955 /* Track the switch-statement nesting in a stack-like manner.
5957 struct glsl_switch_state saved
= state
->switch_state
;
5959 state
->switch_state
.is_switch_innermost
= true;
5960 state
->switch_state
.switch_nesting_ast
= this;
5961 state
->switch_state
.labels_ht
= hash_table_ctor(0, key_contents
,
5962 compare_case_value
);
5963 state
->switch_state
.previous_default
= NULL
;
5965 /* Initalize is_fallthru state to false.
5967 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5968 state
->switch_state
.is_fallthru_var
=
5969 new(ctx
) ir_variable(glsl_type::bool_type
,
5970 "switch_is_fallthru_tmp",
5972 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5974 ir_dereference_variable
*deref_is_fallthru_var
=
5975 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5976 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5979 /* Initialize continue_inside state to false.
5981 state
->switch_state
.continue_inside
=
5982 new(ctx
) ir_variable(glsl_type::bool_type
,
5983 "continue_inside_tmp",
5985 instructions
->push_tail(state
->switch_state
.continue_inside
);
5987 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5988 ir_dereference_variable
*deref_continue_inside_var
=
5989 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5990 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5993 state
->switch_state
.run_default
=
5994 new(ctx
) ir_variable(glsl_type::bool_type
,
5997 instructions
->push_tail(state
->switch_state
.run_default
);
5999 /* Loop around the switch is used for flow control. */
6000 ir_loop
* loop
= new(ctx
) ir_loop();
6001 instructions
->push_tail(loop
);
6003 /* Cache test expression.
6005 test_to_hir(&loop
->body_instructions
, state
);
6007 /* Emit code for body of switch stmt.
6009 body
->hir(&loop
->body_instructions
, state
);
6011 /* Insert a break at the end to exit loop. */
6012 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6013 loop
->body_instructions
.push_tail(jump
);
6015 /* If we are inside loop, check if continue got called inside switch. */
6016 if (state
->loop_nesting_ast
!= NULL
) {
6017 ir_dereference_variable
*deref_continue_inside
=
6018 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6019 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6020 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6022 if (state
->loop_nesting_ast
!= NULL
) {
6023 if (state
->loop_nesting_ast
->rest_expression
) {
6024 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6027 if (state
->loop_nesting_ast
->mode
==
6028 ast_iteration_statement::ast_do_while
) {
6029 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6032 irif
->then_instructions
.push_tail(jump
);
6033 instructions
->push_tail(irif
);
6036 hash_table_dtor(state
->switch_state
.labels_ht
);
6038 state
->switch_state
= saved
;
6040 /* Switch statements do not have r-values. */
6046 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6047 struct _mesa_glsl_parse_state
*state
)
6051 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6052 * on the switch test case. The first one would be already raised when
6053 * getting the test_expression at ast_switch_statement::hir
6055 test_expression
->set_is_lhs(true);
6056 /* Cache value of test expression. */
6057 ir_rvalue
*const test_val
=
6058 test_expression
->hir(instructions
,
6061 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6064 ir_dereference_variable
*deref_test_var
=
6065 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6067 instructions
->push_tail(state
->switch_state
.test_var
);
6068 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6073 ast_switch_body::hir(exec_list
*instructions
,
6074 struct _mesa_glsl_parse_state
*state
)
6077 stmts
->hir(instructions
, state
);
6079 /* Switch bodies do not have r-values. */
6084 ast_case_statement_list::hir(exec_list
*instructions
,
6085 struct _mesa_glsl_parse_state
*state
)
6087 exec_list default_case
, after_default
, tmp
;
6089 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6090 case_stmt
->hir(&tmp
, state
);
6093 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6094 default_case
.append_list(&tmp
);
6098 /* If default case found, append 'after_default' list. */
6099 if (!default_case
.is_empty())
6100 after_default
.append_list(&tmp
);
6102 instructions
->append_list(&tmp
);
6105 /* Handle the default case. This is done here because default might not be
6106 * the last case. We need to add checks against following cases first to see
6107 * if default should be chosen or not.
6109 if (!default_case
.is_empty()) {
6111 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6112 ir_dereference_variable
*deref_run_default_var
=
6113 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6115 /* Choose to run default case initially, following conditional
6116 * assignments might change this.
6118 ir_assignment
*const init_var
=
6119 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6120 instructions
->push_tail(init_var
);
6122 /* Default case was the last one, no checks required. */
6123 if (after_default
.is_empty()) {
6124 instructions
->append_list(&default_case
);
6128 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6129 ir_assignment
*assign
= ir
->as_assignment();
6134 /* Clone the check between case label and init expression. */
6135 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6136 ir_expression
*clone
= exp
->clone(state
, NULL
);
6138 ir_dereference_variable
*deref_var
=
6139 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6140 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6142 ir_assignment
*const set_false
=
6143 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6145 instructions
->push_tail(set_false
);
6148 /* Append default case and all cases after it. */
6149 instructions
->append_list(&default_case
);
6150 instructions
->append_list(&after_default
);
6153 /* Case statements do not have r-values. */
6158 ast_case_statement::hir(exec_list
*instructions
,
6159 struct _mesa_glsl_parse_state
*state
)
6161 labels
->hir(instructions
, state
);
6163 /* Guard case statements depending on fallthru state. */
6164 ir_dereference_variable
*const deref_fallthru_guard
=
6165 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6166 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6168 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6169 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6171 instructions
->push_tail(test_fallthru
);
6173 /* Case statements do not have r-values. */
6179 ast_case_label_list::hir(exec_list
*instructions
,
6180 struct _mesa_glsl_parse_state
*state
)
6182 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6183 label
->hir(instructions
, state
);
6185 /* Case labels do not have r-values. */
6190 ast_case_label::hir(exec_list
*instructions
,
6191 struct _mesa_glsl_parse_state
*state
)
6195 ir_dereference_variable
*deref_fallthru_var
=
6196 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6198 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6200 /* If not default case, ... */
6201 if (this->test_value
!= NULL
) {
6202 /* Conditionally set fallthru state based on
6203 * comparison of cached test expression value to case label.
6205 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6206 ir_constant
*label_const
= label_rval
->constant_expression_value();
6209 YYLTYPE loc
= this->test_value
->get_location();
6211 _mesa_glsl_error(& loc
, state
,
6212 "switch statement case label must be a "
6213 "constant expression");
6215 /* Stuff a dummy value in to allow processing to continue. */
6216 label_const
= new(ctx
) ir_constant(0);
6218 ast_expression
*previous_label
= (ast_expression
*)
6219 hash_table_find(state
->switch_state
.labels_ht
,
6220 (void *)(uintptr_t)&label_const
->value
.u
[0]);
6222 if (previous_label
) {
6223 YYLTYPE loc
= this->test_value
->get_location();
6224 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6226 loc
= previous_label
->get_location();
6227 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6229 hash_table_insert(state
->switch_state
.labels_ht
,
6231 (void *)(uintptr_t)&label_const
->value
.u
[0]);
6235 ir_dereference_variable
*deref_test_var
=
6236 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6238 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6243 * From GLSL 4.40 specification section 6.2 ("Selection"):
6245 * "The type of the init-expression value in a switch statement must
6246 * be a scalar int or uint. The type of the constant-expression value
6247 * in a case label also must be a scalar int or uint. When any pair
6248 * of these values is tested for "equal value" and the types do not
6249 * match, an implicit conversion will be done to convert the int to a
6250 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6253 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6254 YYLTYPE loc
= this->test_value
->get_location();
6256 const glsl_type
*type_a
= label_const
->type
;
6257 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6259 /* Check if int->uint implicit conversion is supported. */
6260 bool integer_conversion_supported
=
6261 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6264 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6265 !integer_conversion_supported
) {
6266 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6267 "init-expression and case label (%s != %s)",
6268 type_a
->name
, type_b
->name
);
6270 /* Conversion of the case label. */
6271 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6272 if (!apply_implicit_conversion(glsl_type::uint_type
,
6273 test_cond
->operands
[0], state
))
6274 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6276 /* Conversion of the init-expression value. */
6277 if (!apply_implicit_conversion(glsl_type::uint_type
,
6278 test_cond
->operands
[1], state
))
6279 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6284 ir_assignment
*set_fallthru_on_test
=
6285 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6287 instructions
->push_tail(set_fallthru_on_test
);
6288 } else { /* default case */
6289 if (state
->switch_state
.previous_default
) {
6290 YYLTYPE loc
= this->get_location();
6291 _mesa_glsl_error(& loc
, state
,
6292 "multiple default labels in one switch");
6294 loc
= state
->switch_state
.previous_default
->get_location();
6295 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6297 state
->switch_state
.previous_default
= this;
6299 /* Set fallthru condition on 'run_default' bool. */
6300 ir_dereference_variable
*deref_run_default
=
6301 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6302 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6303 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6307 /* Set falltrhu state. */
6308 ir_assignment
*set_fallthru
=
6309 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6311 instructions
->push_tail(set_fallthru
);
6314 /* Case statements do not have r-values. */
6319 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6320 struct _mesa_glsl_parse_state
*state
)
6324 if (condition
!= NULL
) {
6325 ir_rvalue
*const cond
=
6326 condition
->hir(instructions
, state
);
6329 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6330 YYLTYPE loc
= condition
->get_location();
6332 _mesa_glsl_error(& loc
, state
,
6333 "loop condition must be scalar boolean");
6335 /* As the first code in the loop body, generate a block that looks
6336 * like 'if (!condition) break;' as the loop termination condition.
6338 ir_rvalue
*const not_cond
=
6339 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6341 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6343 ir_jump
*const break_stmt
=
6344 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6346 if_stmt
->then_instructions
.push_tail(break_stmt
);
6347 instructions
->push_tail(if_stmt
);
6354 ast_iteration_statement::hir(exec_list
*instructions
,
6355 struct _mesa_glsl_parse_state
*state
)
6359 /* For-loops and while-loops start a new scope, but do-while loops do not.
6361 if (mode
!= ast_do_while
)
6362 state
->symbols
->push_scope();
6364 if (init_statement
!= NULL
)
6365 init_statement
->hir(instructions
, state
);
6367 ir_loop
*const stmt
= new(ctx
) ir_loop();
6368 instructions
->push_tail(stmt
);
6370 /* Track the current loop nesting. */
6371 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6373 state
->loop_nesting_ast
= this;
6375 /* Likewise, indicate that following code is closest to a loop,
6376 * NOT closest to a switch.
6378 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6379 state
->switch_state
.is_switch_innermost
= false;
6381 if (mode
!= ast_do_while
)
6382 condition_to_hir(&stmt
->body_instructions
, state
);
6385 body
->hir(& stmt
->body_instructions
, state
);
6387 if (rest_expression
!= NULL
)
6388 rest_expression
->hir(& stmt
->body_instructions
, state
);
6390 if (mode
== ast_do_while
)
6391 condition_to_hir(&stmt
->body_instructions
, state
);
6393 if (mode
!= ast_do_while
)
6394 state
->symbols
->pop_scope();
6396 /* Restore previous nesting before returning. */
6397 state
->loop_nesting_ast
= nesting_ast
;
6398 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6400 /* Loops do not have r-values.
6407 * Determine if the given type is valid for establishing a default precision
6410 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6412 * "The precision statement
6414 * precision precision-qualifier type;
6416 * can be used to establish a default precision qualifier. The type field
6417 * can be either int or float or any of the sampler types, and the
6418 * precision-qualifier can be lowp, mediump, or highp."
6420 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6421 * qualifiers on sampler types, but this seems like an oversight (since the
6422 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6423 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6427 is_valid_default_precision_type(const struct glsl_type
*const type
)
6432 switch (type
->base_type
) {
6434 case GLSL_TYPE_FLOAT
:
6435 /* "int" and "float" are valid, but vectors and matrices are not. */
6436 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6437 case GLSL_TYPE_SAMPLER
:
6438 case GLSL_TYPE_IMAGE
:
6439 case GLSL_TYPE_ATOMIC_UINT
:
6448 ast_type_specifier::hir(exec_list
*instructions
,
6449 struct _mesa_glsl_parse_state
*state
)
6451 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6454 YYLTYPE loc
= this->get_location();
6456 /* If this is a precision statement, check that the type to which it is
6457 * applied is either float or int.
6459 * From section 4.5.3 of the GLSL 1.30 spec:
6460 * "The precision statement
6461 * precision precision-qualifier type;
6462 * can be used to establish a default precision qualifier. The type
6463 * field can be either int or float [...]. Any other types or
6464 * qualifiers will result in an error.
6466 if (this->default_precision
!= ast_precision_none
) {
6467 if (!state
->check_precision_qualifiers_allowed(&loc
))
6470 if (this->structure
!= NULL
) {
6471 _mesa_glsl_error(&loc
, state
,
6472 "precision qualifiers do not apply to structures");
6476 if (this->array_specifier
!= NULL
) {
6477 _mesa_glsl_error(&loc
, state
,
6478 "default precision statements do not apply to "
6483 const struct glsl_type
*const type
=
6484 state
->symbols
->get_type(this->type_name
);
6485 if (!is_valid_default_precision_type(type
)) {
6486 _mesa_glsl_error(&loc
, state
,
6487 "default precision statements apply only to "
6488 "float, int, and opaque types");
6492 if (state
->es_shader
) {
6493 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6496 * "Non-precision qualified declarations will use the precision
6497 * qualifier specified in the most recent precision statement
6498 * that is still in scope. The precision statement has the same
6499 * scoping rules as variable declarations. If it is declared
6500 * inside a compound statement, its effect stops at the end of
6501 * the innermost statement it was declared in. Precision
6502 * statements in nested scopes override precision statements in
6503 * outer scopes. Multiple precision statements for the same basic
6504 * type can appear inside the same scope, with later statements
6505 * overriding earlier statements within that scope."
6507 * Default precision specifications follow the same scope rules as
6508 * variables. So, we can track the state of the default precision
6509 * qualifiers in the symbol table, and the rules will just work. This
6510 * is a slight abuse of the symbol table, but it has the semantics
6513 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6514 this->default_precision
);
6517 /* FINISHME: Translate precision statements into IR. */
6521 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6522 * process_record_constructor() can do type-checking on C-style initializer
6523 * expressions of structs, but ast_struct_specifier should only be translated
6524 * to HIR if it is declaring the type of a structure.
6526 * The ->is_declaration field is false for initializers of variables
6527 * declared separately from the struct's type definition.
6529 * struct S { ... }; (is_declaration = true)
6530 * struct T { ... } t = { ... }; (is_declaration = true)
6531 * S s = { ... }; (is_declaration = false)
6533 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6534 return this->structure
->hir(instructions
, state
);
6541 * Process a structure or interface block tree into an array of structure fields
6543 * After parsing, where there are some syntax differnces, structures and
6544 * interface blocks are almost identical. They are similar enough that the
6545 * AST for each can be processed the same way into a set of
6546 * \c glsl_struct_field to describe the members.
6548 * If we're processing an interface block, var_mode should be the type of the
6549 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6550 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6554 * The number of fields processed. A pointer to the array structure fields is
6555 * stored in \c *fields_ret.
6558 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6559 struct _mesa_glsl_parse_state
*state
,
6560 exec_list
*declarations
,
6561 glsl_struct_field
**fields_ret
,
6563 enum glsl_matrix_layout matrix_layout
,
6564 bool allow_reserved_names
,
6565 ir_variable_mode var_mode
,
6566 ast_type_qualifier
*layout
,
6567 unsigned block_stream
,
6568 unsigned block_xfb_buffer
,
6569 unsigned block_xfb_offset
,
6570 unsigned expl_location
,
6571 unsigned expl_align
)
6573 unsigned decl_count
= 0;
6574 unsigned next_offset
= 0;
6576 /* Make an initial pass over the list of fields to determine how
6577 * many there are. Each element in this list is an ast_declarator_list.
6578 * This means that we actually need to count the number of elements in the
6579 * 'declarations' list in each of the elements.
6581 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6582 decl_count
+= decl_list
->declarations
.length();
6585 /* Allocate storage for the fields and process the field
6586 * declarations. As the declarations are processed, try to also convert
6587 * the types to HIR. This ensures that structure definitions embedded in
6588 * other structure definitions or in interface blocks are processed.
6590 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6593 bool first_member
= true;
6594 bool first_member_has_explicit_location
= false;
6597 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6598 const char *type_name
;
6599 YYLTYPE loc
= decl_list
->get_location();
6601 decl_list
->type
->specifier
->hir(instructions
, state
);
6603 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6605 * "Anonymous structures are not supported; so embedded structures
6606 * must have a declarator. A name given to an embedded struct is
6607 * scoped at the same level as the struct it is embedded in."
6609 * The same section of the GLSL 1.20 spec says:
6611 * "Anonymous structures are not supported. Embedded structures are
6614 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6615 * embedded structures in 1.10 only.
6617 if (state
->language_version
!= 110 &&
6618 decl_list
->type
->specifier
->structure
!= NULL
)
6619 _mesa_glsl_error(&loc
, state
,
6620 "embedded structure declarations are not allowed");
6622 const glsl_type
*decl_type
=
6623 decl_list
->type
->glsl_type(& type_name
, state
);
6625 const struct ast_type_qualifier
*const qual
=
6626 &decl_list
->type
->qualifier
;
6628 /* From section 4.3.9 of the GLSL 4.40 spec:
6630 * "[In interface blocks] opaque types are not allowed."
6632 * It should be impossible for decl_type to be NULL here. Cases that
6633 * might naturally lead to decl_type being NULL, especially for the
6634 * is_interface case, will have resulted in compilation having
6635 * already halted due to a syntax error.
6640 if (decl_type
->contains_opaque()) {
6641 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6642 "interface block contains opaque variable");
6645 if (decl_type
->contains_atomic()) {
6646 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6648 * "Members of structures cannot be declared as atomic counter
6651 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6654 if (decl_type
->contains_image()) {
6655 /* FINISHME: Same problem as with atomic counters.
6656 * FINISHME: Request clarification from Khronos and add
6657 * FINISHME: spec quotation here.
6659 _mesa_glsl_error(&loc
, state
, "image in structure");
6663 if (qual
->flags
.q
.explicit_binding
) {
6664 _mesa_glsl_error(&loc
, state
,
6665 "binding layout qualifier cannot be applied "
6666 "to struct or interface block members");
6670 if (!first_member
) {
6671 if (!layout
->flags
.q
.explicit_location
&&
6672 ((first_member_has_explicit_location
&&
6673 !qual
->flags
.q
.explicit_location
) ||
6674 (!first_member_has_explicit_location
&&
6675 qual
->flags
.q
.explicit_location
))) {
6676 _mesa_glsl_error(&loc
, state
,
6677 "when block-level location layout qualifier "
6678 "is not supplied either all members must "
6679 "have a location layout qualifier or all "
6680 "members must not have a location layout "
6684 first_member
= false;
6685 first_member_has_explicit_location
=
6686 qual
->flags
.q
.explicit_location
;
6690 if (qual
->flags
.q
.std140
||
6691 qual
->flags
.q
.std430
||
6692 qual
->flags
.q
.packed
||
6693 qual
->flags
.q
.shared
) {
6694 _mesa_glsl_error(&loc
, state
,
6695 "uniform/shader storage block layout qualifiers "
6696 "std140, std430, packed, and shared can only be "
6697 "applied to uniform/shader storage blocks, not "
6701 if (qual
->flags
.q
.constant
) {
6702 _mesa_glsl_error(&loc
, state
,
6703 "const storage qualifier cannot be applied "
6704 "to struct or interface block members");
6707 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6709 * "A block member may be declared with a stream identifier, but
6710 * the specified stream must match the stream associated with the
6711 * containing block."
6713 if (qual
->flags
.q
.explicit_stream
) {
6714 unsigned qual_stream
;
6715 if (process_qualifier_constant(state
, &loc
, "stream",
6716 qual
->stream
, &qual_stream
) &&
6717 qual_stream
!= block_stream
) {
6718 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6719 "interface block member does not match "
6720 "the interface block (%u vs %u)", qual_stream
,
6726 unsigned explicit_xfb_buffer
= 0;
6727 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6728 unsigned qual_xfb_buffer
;
6729 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6730 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6731 explicit_xfb_buffer
= 1;
6732 if (qual_xfb_buffer
!= block_xfb_buffer
)
6733 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6734 "interface block member does not match "
6735 "the interface block (%u vs %u)",
6736 qual_xfb_buffer
, block_xfb_buffer
);
6738 xfb_buffer
= (int) qual_xfb_buffer
;
6741 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
6742 xfb_buffer
= (int) block_xfb_buffer
;
6745 int xfb_stride
= -1;
6746 if (qual
->flags
.q
.explicit_xfb_stride
) {
6747 unsigned qual_xfb_stride
;
6748 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6749 qual
->xfb_stride
, &qual_xfb_stride
)) {
6750 xfb_stride
= (int) qual_xfb_stride
;
6754 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6755 _mesa_glsl_error(&loc
, state
,
6756 "interpolation qualifiers cannot be used "
6757 "with uniform interface blocks");
6760 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6761 qual
->has_auxiliary_storage()) {
6762 _mesa_glsl_error(&loc
, state
,
6763 "auxiliary storage qualifiers cannot be used "
6764 "in uniform blocks or structures.");
6767 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6768 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6769 _mesa_glsl_error(&loc
, state
,
6770 "row_major and column_major can only be "
6771 "applied to interface blocks");
6773 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6776 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6777 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6778 "readonly and writeonly.");
6781 foreach_list_typed (ast_declaration
, decl
, link
,
6782 &decl_list
->declarations
) {
6783 YYLTYPE loc
= decl
->get_location();
6785 if (!allow_reserved_names
)
6786 validate_identifier(decl
->identifier
, loc
, state
);
6788 const struct glsl_type
*field_type
=
6789 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6790 validate_array_dimensions(field_type
, state
, &loc
);
6791 fields
[i
].type
= field_type
;
6792 fields
[i
].name
= decl
->identifier
;
6793 fields
[i
].interpolation
=
6794 interpret_interpolation_qualifier(qual
, field_type
,
6795 var_mode
, state
, &loc
);
6796 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6797 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6798 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6799 fields
[i
].precision
= qual
->precision
;
6800 fields
[i
].offset
= -1;
6801 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6802 fields
[i
].xfb_buffer
= xfb_buffer
;
6803 fields
[i
].xfb_stride
= xfb_stride
;
6805 if (qual
->flags
.q
.explicit_location
) {
6806 unsigned qual_location
;
6807 if (process_qualifier_constant(state
, &loc
, "location",
6808 qual
->location
, &qual_location
)) {
6809 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6810 expl_location
= fields
[i
].location
+
6811 fields
[i
].type
->count_attribute_slots(false);
6814 if (layout
&& layout
->flags
.q
.explicit_location
) {
6815 fields
[i
].location
= expl_location
;
6816 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6818 fields
[i
].location
= -1;
6822 /* Offset can only be used with std430 and std140 layouts an initial
6823 * value of 0 is used for error detection.
6829 if (qual
->flags
.q
.row_major
||
6830 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6836 if(layout
->flags
.q
.std140
) {
6837 align
= field_type
->std140_base_alignment(row_major
);
6838 size
= field_type
->std140_size(row_major
);
6839 } else if (layout
->flags
.q
.std430
) {
6840 align
= field_type
->std430_base_alignment(row_major
);
6841 size
= field_type
->std430_size(row_major
);
6845 if (qual
->flags
.q
.explicit_offset
) {
6846 unsigned qual_offset
;
6847 if (process_qualifier_constant(state
, &loc
, "offset",
6848 qual
->offset
, &qual_offset
)) {
6849 if (align
!= 0 && size
!= 0) {
6850 if (next_offset
> qual_offset
)
6851 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6852 "offset overlaps previous member");
6854 if (qual_offset
% align
) {
6855 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6856 "must be a multiple of the base "
6857 "alignment of %s", field_type
->name
);
6859 fields
[i
].offset
= qual_offset
;
6860 next_offset
= glsl_align(qual_offset
+ size
, align
);
6862 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6863 "with std430 and std140 layouts");
6868 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6869 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6871 if (align
== 0 || size
== 0) {
6872 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6873 "std430 and std140 layouts");
6874 } else if (qual
->flags
.q
.explicit_align
) {
6875 unsigned member_align
;
6876 if (process_qualifier_constant(state
, &loc
, "align",
6877 qual
->align
, &member_align
)) {
6878 if (member_align
== 0 ||
6879 member_align
& (member_align
- 1)) {
6880 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6881 "in not a power of 2");
6883 fields
[i
].offset
= glsl_align(offset
, member_align
);
6884 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6888 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6889 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6891 } else if (!qual
->flags
.q
.explicit_offset
) {
6892 if (align
!= 0 && size
!= 0)
6893 next_offset
= glsl_align(next_offset
+ size
, align
);
6896 /* From the ARB_enhanced_layouts spec:
6898 * "The given offset applies to the first component of the first
6899 * member of the qualified entity. Then, within the qualified
6900 * entity, subsequent components are each assigned, in order, to
6901 * the next available offset aligned to a multiple of that
6902 * component's size. Aggregate types are flattened down to the
6903 * component level to get this sequence of components."
6905 if (qual
->flags
.q
.explicit_xfb_offset
) {
6906 unsigned xfb_offset
;
6907 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
6908 qual
->offset
, &xfb_offset
)) {
6909 fields
[i
].offset
= xfb_offset
;
6910 block_xfb_offset
= fields
[i
].offset
+
6911 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6914 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
6915 unsigned align
= field_type
->is_64bit() ? 8 : 4;
6916 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
6918 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6922 /* Propogate row- / column-major information down the fields of the
6923 * structure or interface block. Structures need this data because
6924 * the structure may contain a structure that contains ... a matrix
6925 * that need the proper layout.
6927 if (is_interface
&& layout
&&
6928 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6929 (field_type
->without_array()->is_matrix()
6930 || field_type
->without_array()->is_record())) {
6931 /* If no layout is specified for the field, inherit the layout
6934 fields
[i
].matrix_layout
= matrix_layout
;
6936 if (qual
->flags
.q
.row_major
)
6937 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6938 else if (qual
->flags
.q
.column_major
)
6939 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6941 /* If we're processing an uniform or buffer block, the matrix
6942 * layout must be decided by this point.
6944 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6945 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6948 /* Image qualifiers are allowed on buffer variables, which can only
6949 * be defined inside shader storage buffer objects
6951 if (layout
&& var_mode
== ir_var_shader_storage
) {
6952 /* For readonly and writeonly qualifiers the field definition,
6953 * if set, overwrites the layout qualifier.
6955 if (qual
->flags
.q
.read_only
) {
6956 fields
[i
].image_read_only
= true;
6957 fields
[i
].image_write_only
= false;
6958 } else if (qual
->flags
.q
.write_only
) {
6959 fields
[i
].image_read_only
= false;
6960 fields
[i
].image_write_only
= true;
6962 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6963 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6966 /* For other qualifiers, we set the flag if either the layout
6967 * qualifier or the field qualifier are set
6969 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6970 layout
->flags
.q
.coherent
;
6971 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6972 layout
->flags
.q
._volatile
;
6973 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6974 layout
->flags
.q
.restrict_flag
;
6981 assert(i
== decl_count
);
6983 *fields_ret
= fields
;
6989 ast_struct_specifier::hir(exec_list
*instructions
,
6990 struct _mesa_glsl_parse_state
*state
)
6992 YYLTYPE loc
= this->get_location();
6994 unsigned expl_location
= 0;
6995 if (layout
&& layout
->flags
.q
.explicit_location
) {
6996 if (!process_qualifier_constant(state
, &loc
, "location",
6997 layout
->location
, &expl_location
)) {
7000 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7004 glsl_struct_field
*fields
;
7005 unsigned decl_count
=
7006 ast_process_struct_or_iface_block_members(instructions
,
7008 &this->declarations
,
7011 GLSL_MATRIX_LAYOUT_INHERITED
,
7012 false /* allow_reserved_names */,
7015 0, /* for interface only */
7016 0, /* for interface only */
7017 0, /* for interface only */
7019 0 /* for interface only */);
7021 validate_identifier(this->name
, loc
, state
);
7023 const glsl_type
*t
=
7024 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7026 if (!state
->symbols
->add_type(name
, t
)) {
7027 const glsl_type
*match
= state
->symbols
->get_type(name
);
7028 /* allow struct matching for desktop GL - older UE4 does this */
7029 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
7030 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7032 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7034 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7036 state
->num_user_structures
+ 1);
7038 s
[state
->num_user_structures
] = t
;
7039 state
->user_structures
= s
;
7040 state
->num_user_structures
++;
7044 /* Structure type definitions do not have r-values.
7051 * Visitor class which detects whether a given interface block has been used.
7053 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7056 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7057 : mode(mode
), block(block
), found(false)
7061 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7063 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7067 return visit_continue
;
7070 bool usage_found() const
7076 ir_variable_mode mode
;
7077 const glsl_type
*block
;
7082 is_unsized_array_last_element(ir_variable
*v
)
7084 const glsl_type
*interface_type
= v
->get_interface_type();
7085 int length
= interface_type
->length
;
7087 assert(v
->type
->is_unsized_array());
7089 /* Check if it is the last element of the interface */
7090 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7096 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7098 var
->data
.image_read_only
= field
.image_read_only
;
7099 var
->data
.image_write_only
= field
.image_write_only
;
7100 var
->data
.image_coherent
= field
.image_coherent
;
7101 var
->data
.image_volatile
= field
.image_volatile
;
7102 var
->data
.image_restrict
= field
.image_restrict
;
7106 ast_interface_block::hir(exec_list
*instructions
,
7107 struct _mesa_glsl_parse_state
*state
)
7109 YYLTYPE loc
= this->get_location();
7111 /* Interface blocks must be declared at global scope */
7112 if (state
->current_function
!= NULL
) {
7113 _mesa_glsl_error(&loc
, state
,
7114 "Interface block `%s' must be declared "
7119 /* Validate qualifiers:
7121 * - Layout Qualifiers as per the table in Section 4.4
7122 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7124 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7127 * "Additionally, memory qualifiers may also be used in the declaration
7128 * of shader storage blocks"
7130 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7131 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7132 * Layout Qualifiers) of the GLSL 4.50 spec says:
7134 * "The std430 qualifier is supported only for shader storage blocks;
7135 * using std430 on a uniform block will result in a compile-time error."
7137 ast_type_qualifier allowed_blk_qualifiers
;
7138 allowed_blk_qualifiers
.flags
.i
= 0;
7139 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7140 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7141 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7142 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7143 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7144 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7145 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7146 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7147 if (this->layout
.flags
.q
.buffer
) {
7148 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7149 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7150 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7151 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7152 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7153 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7154 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7156 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7159 /* Interface block */
7160 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7162 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7163 if (this->layout
.flags
.q
.out
) {
7164 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7165 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7166 state
->stage
== MESA_SHADER_TESS_CTRL
||
7167 state
->stage
== MESA_SHADER_TESS_EVAL
||
7168 state
->stage
== MESA_SHADER_VERTEX
) {
7169 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7170 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7171 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7172 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7173 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7174 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7175 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7176 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7178 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7179 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7183 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7184 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7185 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7190 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7191 "invalid qualifier for block",
7194 /* The ast_interface_block has a list of ast_declarator_lists. We
7195 * need to turn those into ir_variables with an association
7196 * with this uniform block.
7198 enum glsl_interface_packing packing
;
7199 if (this->layout
.flags
.q
.shared
) {
7200 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7201 } else if (this->layout
.flags
.q
.packed
) {
7202 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7203 } else if (this->layout
.flags
.q
.std430
) {
7204 packing
= GLSL_INTERFACE_PACKING_STD430
;
7206 /* The default layout is std140.
7208 packing
= GLSL_INTERFACE_PACKING_STD140
;
7211 ir_variable_mode var_mode
;
7212 const char *iface_type_name
;
7213 if (this->layout
.flags
.q
.in
) {
7214 var_mode
= ir_var_shader_in
;
7215 iface_type_name
= "in";
7216 } else if (this->layout
.flags
.q
.out
) {
7217 var_mode
= ir_var_shader_out
;
7218 iface_type_name
= "out";
7219 } else if (this->layout
.flags
.q
.uniform
) {
7220 var_mode
= ir_var_uniform
;
7221 iface_type_name
= "uniform";
7222 } else if (this->layout
.flags
.q
.buffer
) {
7223 var_mode
= ir_var_shader_storage
;
7224 iface_type_name
= "buffer";
7226 var_mode
= ir_var_auto
;
7227 iface_type_name
= "UNKNOWN";
7228 assert(!"interface block layout qualifier not found!");
7231 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7232 if (this->layout
.flags
.q
.row_major
)
7233 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7234 else if (this->layout
.flags
.q
.column_major
)
7235 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7237 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7238 exec_list declared_variables
;
7239 glsl_struct_field
*fields
;
7241 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7242 * that we don't have incompatible qualifiers
7244 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7245 _mesa_glsl_error(&loc
, state
,
7246 "Interface block sets both readonly and writeonly");
7249 unsigned qual_stream
;
7250 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7252 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7253 /* If the stream qualifier is invalid it doesn't make sense to continue
7254 * on and try to compare stream layouts on member variables against it
7255 * so just return early.
7260 unsigned qual_xfb_buffer
;
7261 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7262 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7263 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7267 unsigned qual_xfb_offset
;
7268 if (layout
.flags
.q
.explicit_xfb_offset
) {
7269 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7270 layout
.offset
, &qual_xfb_offset
)) {
7275 unsigned qual_xfb_stride
;
7276 if (layout
.flags
.q
.explicit_xfb_stride
) {
7277 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7278 layout
.xfb_stride
, &qual_xfb_stride
)) {
7283 unsigned expl_location
= 0;
7284 if (layout
.flags
.q
.explicit_location
) {
7285 if (!process_qualifier_constant(state
, &loc
, "location",
7286 layout
.location
, &expl_location
)) {
7289 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7293 unsigned expl_align
= 0;
7294 if (layout
.flags
.q
.explicit_align
) {
7295 if (!process_qualifier_constant(state
, &loc
, "align",
7296 layout
.align
, &expl_align
)) {
7299 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7300 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7307 unsigned int num_variables
=
7308 ast_process_struct_or_iface_block_members(&declared_variables
,
7310 &this->declarations
,
7314 redeclaring_per_vertex
,
7323 if (!redeclaring_per_vertex
) {
7324 validate_identifier(this->block_name
, loc
, state
);
7326 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7328 * "Block names have no other use within a shader beyond interface
7329 * matching; it is a compile-time error to use a block name at global
7330 * scope for anything other than as a block name."
7332 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7333 if (var
&& !var
->type
->is_interface()) {
7334 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7335 "already used in the scope.",
7340 const glsl_type
*earlier_per_vertex
= NULL
;
7341 if (redeclaring_per_vertex
) {
7342 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7343 * the named interface block gl_in, we can find it by looking at the
7344 * previous declaration of gl_in. Otherwise we can find it by looking
7345 * at the previous decalartion of any of the built-in outputs,
7348 * Also check that the instance name and array-ness of the redeclaration
7352 case ir_var_shader_in
:
7353 if (ir_variable
*earlier_gl_in
=
7354 state
->symbols
->get_variable("gl_in")) {
7355 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7357 _mesa_glsl_error(&loc
, state
,
7358 "redeclaration of gl_PerVertex input not allowed "
7360 _mesa_shader_stage_to_string(state
->stage
));
7362 if (this->instance_name
== NULL
||
7363 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7364 !this->array_specifier
->is_single_dimension()) {
7365 _mesa_glsl_error(&loc
, state
,
7366 "gl_PerVertex input must be redeclared as "
7370 case ir_var_shader_out
:
7371 if (ir_variable
*earlier_gl_Position
=
7372 state
->symbols
->get_variable("gl_Position")) {
7373 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7374 } else if (ir_variable
*earlier_gl_out
=
7375 state
->symbols
->get_variable("gl_out")) {
7376 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7378 _mesa_glsl_error(&loc
, state
,
7379 "redeclaration of gl_PerVertex output not "
7380 "allowed in the %s shader",
7381 _mesa_shader_stage_to_string(state
->stage
));
7383 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7384 if (this->instance_name
== NULL
||
7385 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7386 _mesa_glsl_error(&loc
, state
,
7387 "gl_PerVertex output must be redeclared as "
7391 if (this->instance_name
!= NULL
) {
7392 _mesa_glsl_error(&loc
, state
,
7393 "gl_PerVertex output may not be redeclared with "
7394 "an instance name");
7399 _mesa_glsl_error(&loc
, state
,
7400 "gl_PerVertex must be declared as an input or an "
7405 if (earlier_per_vertex
== NULL
) {
7406 /* An error has already been reported. Bail out to avoid null
7407 * dereferences later in this function.
7412 /* Copy locations from the old gl_PerVertex interface block. */
7413 for (unsigned i
= 0; i
< num_variables
; i
++) {
7414 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7416 _mesa_glsl_error(&loc
, state
,
7417 "redeclaration of gl_PerVertex must be a subset "
7418 "of the built-in members of gl_PerVertex");
7420 fields
[i
].location
=
7421 earlier_per_vertex
->fields
.structure
[j
].location
;
7423 earlier_per_vertex
->fields
.structure
[j
].offset
;
7424 fields
[i
].interpolation
=
7425 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7426 fields
[i
].centroid
=
7427 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7429 earlier_per_vertex
->fields
.structure
[j
].sample
;
7431 earlier_per_vertex
->fields
.structure
[j
].patch
;
7432 fields
[i
].precision
=
7433 earlier_per_vertex
->fields
.structure
[j
].precision
;
7434 fields
[i
].explicit_xfb_buffer
=
7435 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7436 fields
[i
].xfb_buffer
=
7437 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7438 fields
[i
].xfb_stride
=
7439 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7443 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7446 * If a built-in interface block is redeclared, it must appear in
7447 * the shader before any use of any member included in the built-in
7448 * declaration, or a compilation error will result.
7450 * This appears to be a clarification to the behaviour established for
7451 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7452 * regardless of GLSL version.
7454 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7455 v
.run(instructions
);
7456 if (v
.usage_found()) {
7457 _mesa_glsl_error(&loc
, state
,
7458 "redeclaration of a built-in interface block must "
7459 "appear before any use of any member of the "
7464 const glsl_type
*block_type
=
7465 glsl_type::get_interface_instance(fields
,
7470 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7472 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7473 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7476 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7477 YYLTYPE loc
= this->get_location();
7478 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7479 "already taken in the current scope",
7480 this->block_name
, iface_type_name
);
7483 /* Since interface blocks cannot contain statements, it should be
7484 * impossible for the block to generate any instructions.
7486 assert(declared_variables
.is_empty());
7488 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7490 * Geometry shader input variables get the per-vertex values written
7491 * out by vertex shader output variables of the same names. Since a
7492 * geometry shader operates on a set of vertices, each input varying
7493 * variable (or input block, see interface blocks below) needs to be
7494 * declared as an array.
7496 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7497 var_mode
== ir_var_shader_in
) {
7498 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7499 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7500 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7501 this->array_specifier
== NULL
&&
7502 var_mode
== ir_var_shader_in
) {
7503 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7504 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7505 this->array_specifier
== NULL
&&
7506 var_mode
== ir_var_shader_out
) {
7507 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7511 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7514 * "If an instance name (instance-name) is used, then it puts all the
7515 * members inside a scope within its own name space, accessed with the
7516 * field selector ( . ) operator (analogously to structures)."
7518 if (this->instance_name
) {
7519 if (redeclaring_per_vertex
) {
7520 /* When a built-in in an unnamed interface block is redeclared,
7521 * get_variable_being_redeclared() calls
7522 * check_builtin_array_max_size() to make sure that built-in array
7523 * variables aren't redeclared to illegal sizes. But we're looking
7524 * at a redeclaration of a named built-in interface block. So we
7525 * have to manually call check_builtin_array_max_size() for all parts
7526 * of the interface that are arrays.
7528 for (unsigned i
= 0; i
< num_variables
; i
++) {
7529 if (fields
[i
].type
->is_array()) {
7530 const unsigned size
= fields
[i
].type
->array_size();
7531 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7535 validate_identifier(this->instance_name
, loc
, state
);
7540 if (this->array_specifier
!= NULL
) {
7541 const glsl_type
*block_array_type
=
7542 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7544 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7546 * For uniform blocks declared an array, each individual array
7547 * element corresponds to a separate buffer object backing one
7548 * instance of the block. As the array size indicates the number
7549 * of buffer objects needed, uniform block array declarations
7550 * must specify an array size.
7552 * And a few paragraphs later:
7554 * Geometry shader input blocks must be declared as arrays and
7555 * follow the array declaration and linking rules for all
7556 * geometry shader inputs. All other input and output block
7557 * arrays must specify an array size.
7559 * The same applies to tessellation shaders.
7561 * The upshot of this is that the only circumstance where an
7562 * interface array size *doesn't* need to be specified is on a
7563 * geometry shader input, tessellation control shader input,
7564 * tessellation control shader output, and tessellation evaluation
7567 if (block_array_type
->is_unsized_array()) {
7568 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7569 state
->stage
== MESA_SHADER_TESS_CTRL
||
7570 state
->stage
== MESA_SHADER_TESS_EVAL
;
7571 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7573 if (this->layout
.flags
.q
.in
) {
7575 _mesa_glsl_error(&loc
, state
,
7576 "unsized input block arrays not allowed in "
7578 _mesa_shader_stage_to_string(state
->stage
));
7579 } else if (this->layout
.flags
.q
.out
) {
7581 _mesa_glsl_error(&loc
, state
,
7582 "unsized output block arrays not allowed in "
7584 _mesa_shader_stage_to_string(state
->stage
));
7586 /* by elimination, this is a uniform block array */
7587 _mesa_glsl_error(&loc
, state
,
7588 "unsized uniform block arrays not allowed in "
7590 _mesa_shader_stage_to_string(state
->stage
));
7594 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7596 * * Arrays of arrays of blocks are not allowed
7598 if (state
->es_shader
&& block_array_type
->is_array() &&
7599 block_array_type
->fields
.array
->is_array()) {
7600 _mesa_glsl_error(&loc
, state
,
7601 "arrays of arrays interface blocks are "
7605 var
= new(state
) ir_variable(block_array_type
,
7606 this->instance_name
,
7609 var
= new(state
) ir_variable(block_type
,
7610 this->instance_name
,
7614 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7615 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7617 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7618 var
->data
.read_only
= true;
7620 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7621 handle_geometry_shader_input_decl(state
, loc
, var
);
7622 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7623 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7624 handle_tess_shader_input_decl(state
, loc
, var
);
7625 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7626 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7628 for (unsigned i
= 0; i
< num_variables
; i
++) {
7629 if (var
->data
.mode
== ir_var_shader_storage
)
7630 apply_memory_qualifiers(var
, fields
[i
]);
7633 if (ir_variable
*earlier
=
7634 state
->symbols
->get_variable(this->instance_name
)) {
7635 if (!redeclaring_per_vertex
) {
7636 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7637 this->instance_name
);
7639 earlier
->data
.how_declared
= ir_var_declared_normally
;
7640 earlier
->type
= var
->type
;
7641 earlier
->reinit_interface_type(block_type
);
7644 if (this->layout
.flags
.q
.explicit_binding
) {
7645 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7649 var
->data
.stream
= qual_stream
;
7650 if (layout
.flags
.q
.explicit_location
) {
7651 var
->data
.location
= expl_location
;
7652 var
->data
.explicit_location
= true;
7655 state
->symbols
->add_variable(var
);
7656 instructions
->push_tail(var
);
7659 /* In order to have an array size, the block must also be declared with
7662 assert(this->array_specifier
== NULL
);
7664 for (unsigned i
= 0; i
< num_variables
; i
++) {
7666 new(state
) ir_variable(fields
[i
].type
,
7667 ralloc_strdup(state
, fields
[i
].name
),
7669 var
->data
.interpolation
= fields
[i
].interpolation
;
7670 var
->data
.centroid
= fields
[i
].centroid
;
7671 var
->data
.sample
= fields
[i
].sample
;
7672 var
->data
.patch
= fields
[i
].patch
;
7673 var
->data
.stream
= qual_stream
;
7674 var
->data
.location
= fields
[i
].location
;
7676 if (fields
[i
].location
!= -1)
7677 var
->data
.explicit_location
= true;
7679 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7680 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7682 if (fields
[i
].offset
!= -1)
7683 var
->data
.explicit_xfb_offset
= true;
7684 var
->data
.offset
= fields
[i
].offset
;
7686 var
->init_interface_type(block_type
);
7688 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7689 var
->data
.read_only
= true;
7691 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7692 if (state
->es_shader
) {
7693 var
->data
.precision
=
7694 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7698 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7699 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7700 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7702 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7705 if (var
->data
.mode
== ir_var_shader_storage
)
7706 apply_memory_qualifiers(var
, fields
[i
]);
7708 /* Examine var name here since var may get deleted in the next call */
7709 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7711 if (redeclaring_per_vertex
) {
7712 ir_variable
*earlier
=
7713 get_variable_being_redeclared(var
, loc
, state
,
7714 true /* allow_all_redeclarations */);
7715 if (!var_is_gl_id
|| earlier
== NULL
) {
7716 _mesa_glsl_error(&loc
, state
,
7717 "redeclaration of gl_PerVertex can only "
7718 "include built-in variables");
7719 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7720 _mesa_glsl_error(&loc
, state
,
7721 "`%s' has already been redeclared",
7724 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7725 earlier
->reinit_interface_type(block_type
);
7730 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7731 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7733 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7734 * The UBO declaration itself doesn't get an ir_variable unless it
7735 * has an instance name. This is ugly.
7737 if (this->layout
.flags
.q
.explicit_binding
) {
7738 apply_explicit_binding(state
, &loc
, var
,
7739 var
->get_interface_type(), &this->layout
);
7742 if (var
->type
->is_unsized_array()) {
7743 if (var
->is_in_shader_storage_block()) {
7744 if (is_unsized_array_last_element(var
)) {
7745 var
->data
.from_ssbo_unsized_array
= true;
7748 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7750 * "If an array is declared as the last member of a shader storage
7751 * block and the size is not specified at compile-time, it is
7752 * sized at run-time. In all other cases, arrays are sized only
7755 if (state
->es_shader
) {
7756 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
7757 "definition: only last member of a shader "
7758 "storage block can be defined as unsized "
7759 "array", fields
[i
].name
);
7764 state
->symbols
->add_variable(var
);
7765 instructions
->push_tail(var
);
7768 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7769 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7771 * It is also a compilation error ... to redeclare a built-in
7772 * block and then use a member from that built-in block that was
7773 * not included in the redeclaration.
7775 * This appears to be a clarification to the behaviour established
7776 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7777 * behaviour regardless of GLSL version.
7779 * To prevent the shader from using a member that was not included in
7780 * the redeclaration, we disable any ir_variables that are still
7781 * associated with the old declaration of gl_PerVertex (since we've
7782 * already updated all of the variables contained in the new
7783 * gl_PerVertex to point to it).
7785 * As a side effect this will prevent
7786 * validate_intrastage_interface_blocks() from getting confused and
7787 * thinking there are conflicting definitions of gl_PerVertex in the
7790 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7791 ir_variable
*const var
= node
->as_variable();
7793 var
->get_interface_type() == earlier_per_vertex
&&
7794 var
->data
.mode
== var_mode
) {
7795 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7796 _mesa_glsl_error(&loc
, state
,
7797 "redeclaration of gl_PerVertex cannot "
7798 "follow a redeclaration of `%s'",
7801 state
->symbols
->disable_variable(var
->name
);
7813 ast_tcs_output_layout::hir(exec_list
*instructions
,
7814 struct _mesa_glsl_parse_state
*state
)
7816 YYLTYPE loc
= this->get_location();
7818 unsigned num_vertices
;
7819 if (!state
->out_qualifier
->vertices
->
7820 process_qualifier_constant(state
, "vertices", &num_vertices
,
7822 /* return here to stop cascading incorrect error messages */
7826 /* If any shader outputs occurred before this declaration and specified an
7827 * array size, make sure the size they specified is consistent with the
7830 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7831 _mesa_glsl_error(&loc
, state
,
7832 "this tessellation control shader output layout "
7833 "specifies %u vertices, but a previous output "
7834 "is declared with size %u",
7835 num_vertices
, state
->tcs_output_size
);
7839 state
->tcs_output_vertices_specified
= true;
7841 /* If any shader outputs occurred before this declaration and did not
7842 * specify an array size, their size is determined now.
7844 foreach_in_list (ir_instruction
, node
, instructions
) {
7845 ir_variable
*var
= node
->as_variable();
7846 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7849 /* Note: Not all tessellation control shader output are arrays. */
7850 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7853 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7854 _mesa_glsl_error(&loc
, state
,
7855 "this tessellation control shader output layout "
7856 "specifies %u vertices, but an access to element "
7857 "%u of output `%s' already exists", num_vertices
,
7858 var
->data
.max_array_access
, var
->name
);
7860 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7870 ast_gs_input_layout::hir(exec_list
*instructions
,
7871 struct _mesa_glsl_parse_state
*state
)
7873 YYLTYPE loc
= this->get_location();
7875 /* If any geometry input layout declaration preceded this one, make sure it
7876 * was consistent with this one.
7878 if (state
->gs_input_prim_type_specified
&&
7879 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7880 _mesa_glsl_error(&loc
, state
,
7881 "geometry shader input layout does not match"
7882 " previous declaration");
7886 /* If any shader inputs occurred before this declaration and specified an
7887 * array size, make sure the size they specified is consistent with the
7890 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7891 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7892 _mesa_glsl_error(&loc
, state
,
7893 "this geometry shader input layout implies %u vertices"
7894 " per primitive, but a previous input is declared"
7895 " with size %u", num_vertices
, state
->gs_input_size
);
7899 state
->gs_input_prim_type_specified
= true;
7901 /* If any shader inputs occurred before this declaration and did not
7902 * specify an array size, their size is determined now.
7904 foreach_in_list(ir_instruction
, node
, instructions
) {
7905 ir_variable
*var
= node
->as_variable();
7906 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7909 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7913 if (var
->type
->is_unsized_array()) {
7914 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7915 _mesa_glsl_error(&loc
, state
,
7916 "this geometry shader input layout implies %u"
7917 " vertices, but an access to element %u of input"
7918 " `%s' already exists", num_vertices
,
7919 var
->data
.max_array_access
, var
->name
);
7921 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7932 ast_cs_input_layout::hir(exec_list
*instructions
,
7933 struct _mesa_glsl_parse_state
*state
)
7935 YYLTYPE loc
= this->get_location();
7937 /* From the ARB_compute_shader specification:
7939 * If the local size of the shader in any dimension is greater
7940 * than the maximum size supported by the implementation for that
7941 * dimension, a compile-time error results.
7943 * It is not clear from the spec how the error should be reported if
7944 * the total size of the work group exceeds
7945 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7946 * report it at compile time as well.
7948 GLuint64 total_invocations
= 1;
7949 unsigned qual_local_size
[3];
7950 for (int i
= 0; i
< 3; i
++) {
7952 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7954 /* Infer a local_size of 1 for unspecified dimensions */
7955 if (this->local_size
[i
] == NULL
) {
7956 qual_local_size
[i
] = 1;
7957 } else if (!this->local_size
[i
]->
7958 process_qualifier_constant(state
, local_size_str
,
7959 &qual_local_size
[i
], false)) {
7960 ralloc_free(local_size_str
);
7963 ralloc_free(local_size_str
);
7965 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7966 _mesa_glsl_error(&loc
, state
,
7967 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7969 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7972 total_invocations
*= qual_local_size
[i
];
7973 if (total_invocations
>
7974 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7975 _mesa_glsl_error(&loc
, state
,
7976 "product of local_sizes exceeds "
7977 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7978 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7983 /* If any compute input layout declaration preceded this one, make sure it
7984 * was consistent with this one.
7986 if (state
->cs_input_local_size_specified
) {
7987 for (int i
= 0; i
< 3; i
++) {
7988 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7989 _mesa_glsl_error(&loc
, state
,
7990 "compute shader input layout does not match"
7991 " previous declaration");
7997 state
->cs_input_local_size_specified
= true;
7998 for (int i
= 0; i
< 3; i
++)
7999 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8001 /* We may now declare the built-in constant gl_WorkGroupSize (see
8002 * builtin_variable_generator::generate_constants() for why we didn't
8003 * declare it earlier).
8005 ir_variable
*var
= new(state
->symbols
)
8006 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8007 var
->data
.how_declared
= ir_var_declared_implicitly
;
8008 var
->data
.read_only
= true;
8009 instructions
->push_tail(var
);
8010 state
->symbols
->add_variable(var
);
8011 ir_constant_data data
;
8012 memset(&data
, 0, sizeof(data
));
8013 for (int i
= 0; i
< 3; i
++)
8014 data
.u
[i
] = qual_local_size
[i
];
8015 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8016 var
->constant_initializer
=
8017 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8018 var
->data
.has_initializer
= true;
8025 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8026 exec_list
*instructions
)
8028 bool gl_FragColor_assigned
= false;
8029 bool gl_FragData_assigned
= false;
8030 bool gl_FragSecondaryColor_assigned
= false;
8031 bool gl_FragSecondaryData_assigned
= false;
8032 bool user_defined_fs_output_assigned
= false;
8033 ir_variable
*user_defined_fs_output
= NULL
;
8035 /* It would be nice to have proper location information. */
8037 memset(&loc
, 0, sizeof(loc
));
8039 foreach_in_list(ir_instruction
, node
, instructions
) {
8040 ir_variable
*var
= node
->as_variable();
8042 if (!var
|| !var
->data
.assigned
)
8045 if (strcmp(var
->name
, "gl_FragColor") == 0)
8046 gl_FragColor_assigned
= true;
8047 else if (strcmp(var
->name
, "gl_FragData") == 0)
8048 gl_FragData_assigned
= true;
8049 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8050 gl_FragSecondaryColor_assigned
= true;
8051 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8052 gl_FragSecondaryData_assigned
= true;
8053 else if (!is_gl_identifier(var
->name
)) {
8054 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8055 var
->data
.mode
== ir_var_shader_out
) {
8056 user_defined_fs_output_assigned
= true;
8057 user_defined_fs_output
= var
;
8062 /* From the GLSL 1.30 spec:
8064 * "If a shader statically assigns a value to gl_FragColor, it
8065 * may not assign a value to any element of gl_FragData. If a
8066 * shader statically writes a value to any element of
8067 * gl_FragData, it may not assign a value to
8068 * gl_FragColor. That is, a shader may assign values to either
8069 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8070 * linked together must also consistently write just one of
8071 * these variables. Similarly, if user declared output
8072 * variables are in use (statically assigned to), then the
8073 * built-in variables gl_FragColor and gl_FragData may not be
8074 * assigned to. These incorrect usages all generate compile
8077 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8078 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8079 "`gl_FragColor' and `gl_FragData'");
8080 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8081 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8082 "`gl_FragColor' and `%s'",
8083 user_defined_fs_output
->name
);
8084 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8085 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8086 "`gl_FragSecondaryColorEXT' and"
8087 " `gl_FragSecondaryDataEXT'");
8088 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8089 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8090 "`gl_FragColor' and"
8091 " `gl_FragSecondaryDataEXT'");
8092 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8093 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8095 " `gl_FragSecondaryColorEXT'");
8096 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8097 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8098 "`gl_FragData' and `%s'",
8099 user_defined_fs_output
->name
);
8102 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8103 !state
->EXT_blend_func_extended_enable
) {
8104 _mesa_glsl_error(&loc
, state
,
8105 "Dual source blending requires EXT_blend_func_extended");
8111 remove_per_vertex_blocks(exec_list
*instructions
,
8112 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8114 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8115 * if it exists in this shader type.
8117 const glsl_type
*per_vertex
= NULL
;
8119 case ir_var_shader_in
:
8120 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8121 per_vertex
= gl_in
->get_interface_type();
8123 case ir_var_shader_out
:
8124 if (ir_variable
*gl_Position
=
8125 state
->symbols
->get_variable("gl_Position")) {
8126 per_vertex
= gl_Position
->get_interface_type();
8130 assert(!"Unexpected mode");
8134 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8135 * need to do anything.
8137 if (per_vertex
== NULL
)
8140 /* If the interface block is used by the shader, then we don't need to do
8143 interface_block_usage_visitor
v(mode
, per_vertex
);
8144 v
.run(instructions
);
8145 if (v
.usage_found())
8148 /* Remove any ir_variable declarations that refer to the interface block
8151 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8152 ir_variable
*const var
= node
->as_variable();
8153 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8154 var
->data
.mode
== mode
) {
8155 state
->symbols
->disable_variable(var
->name
);