2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "glsl_symbol_table.h"
53 #include "glsl_parser_extras.h"
55 #include "compiler/glsl_types.h"
56 #include "util/hash_table.h"
57 #include "main/macros.h"
58 #include "main/shaderobj.h"
60 #include "ir_builder.h"
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:
1005 if (!error_emitted
) {
1006 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1008 instructions
->push_tail(var
);
1009 instructions
->push_tail(assign(var
, rhs
));
1011 ir_dereference_variable
*deref_var
=
1012 new(ctx
) ir_dereference_variable(var
);
1013 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1014 rvalue
= new(ctx
) ir_dereference_variable(var
);
1016 rvalue
= ir_rvalue::error_value(ctx
);
1018 *out_rvalue
= rvalue
;
1021 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1025 return error_emitted
;
1029 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1031 void *ctx
= ralloc_parent(lvalue
);
1034 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1036 instructions
->push_tail(var
);
1038 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1041 return new(ctx
) ir_dereference_variable(var
);
1046 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1048 (void) instructions
;
1055 ast_node::has_sequence_subexpression() const
1061 ast_node::set_is_lhs(bool /* new_value */)
1066 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1067 struct _mesa_glsl_parse_state
*state
)
1069 (void)hir(instructions
, state
);
1073 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1074 struct _mesa_glsl_parse_state
*state
)
1076 (void)hir(instructions
, state
);
1080 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1083 ir_rvalue
*cmp
= NULL
;
1085 if (operation
== ir_binop_all_equal
)
1086 join_op
= ir_binop_logic_and
;
1088 join_op
= ir_binop_logic_or
;
1090 switch (op0
->type
->base_type
) {
1091 case GLSL_TYPE_FLOAT
:
1092 case GLSL_TYPE_UINT
:
1094 case GLSL_TYPE_BOOL
:
1095 case GLSL_TYPE_DOUBLE
:
1096 case GLSL_TYPE_UINT64
:
1097 case GLSL_TYPE_INT64
:
1098 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1100 case GLSL_TYPE_ARRAY
: {
1101 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1102 ir_rvalue
*e0
, *e1
, *result
;
1104 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1105 new(mem_ctx
) ir_constant(i
));
1106 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1107 new(mem_ctx
) ir_constant(i
));
1108 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1111 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1117 mark_whole_array_access(op0
);
1118 mark_whole_array_access(op1
);
1122 case GLSL_TYPE_STRUCT
: {
1123 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1124 ir_rvalue
*e0
, *e1
, *result
;
1125 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1127 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1129 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1131 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1134 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1142 case GLSL_TYPE_ERROR
:
1143 case GLSL_TYPE_VOID
:
1144 case GLSL_TYPE_SAMPLER
:
1145 case GLSL_TYPE_IMAGE
:
1146 case GLSL_TYPE_INTERFACE
:
1147 case GLSL_TYPE_ATOMIC_UINT
:
1148 case GLSL_TYPE_SUBROUTINE
:
1149 case GLSL_TYPE_FUNCTION
:
1150 /* I assume a comparison of a struct containing a sampler just
1151 * ignores the sampler present in the type.
1157 cmp
= new(mem_ctx
) ir_constant(true);
1162 /* For logical operations, we want to ensure that the operands are
1163 * scalar booleans. If it isn't, emit an error and return a constant
1164 * boolean to avoid triggering cascading error messages.
1167 get_scalar_boolean_operand(exec_list
*instructions
,
1168 struct _mesa_glsl_parse_state
*state
,
1169 ast_expression
*parent_expr
,
1171 const char *operand_name
,
1172 bool *error_emitted
)
1174 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1176 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1178 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1181 if (!*error_emitted
) {
1182 YYLTYPE loc
= expr
->get_location();
1183 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1185 parent_expr
->operator_string(parent_expr
->oper
));
1186 *error_emitted
= true;
1189 return new(ctx
) ir_constant(true);
1193 * If name refers to a builtin array whose maximum allowed size is less than
1194 * size, report an error and return true. Otherwise return false.
1197 check_builtin_array_max_size(const char *name
, unsigned size
,
1198 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1200 if ((strcmp("gl_TexCoord", name
) == 0)
1201 && (size
> state
->Const
.MaxTextureCoords
)) {
1202 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1204 * "The size [of gl_TexCoord] can be at most
1205 * gl_MaxTextureCoords."
1207 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1208 "be larger than gl_MaxTextureCoords (%u)",
1209 state
->Const
.MaxTextureCoords
);
1210 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1211 state
->clip_dist_size
= size
;
1212 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1213 /* From section 7.1 (Vertex Shader Special Variables) of the
1216 * "The gl_ClipDistance array is predeclared as unsized and
1217 * must be sized by the shader either redeclaring it with a
1218 * size or indexing it only with integral constant
1219 * expressions. ... The size can be at most
1220 * gl_MaxClipDistances."
1222 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1223 "be larger than gl_MaxClipDistances (%u)",
1224 state
->Const
.MaxClipPlanes
);
1226 } else if (strcmp("gl_CullDistance", name
) == 0) {
1227 state
->cull_dist_size
= size
;
1228 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1229 /* From the ARB_cull_distance spec:
1231 * "The gl_CullDistance array is predeclared as unsized and
1232 * must be sized by the shader either redeclaring it with
1233 * a size or indexing it only with integral constant
1234 * expressions. The size determines the number and set of
1235 * enabled cull distances and can be at most
1236 * gl_MaxCullDistances."
1238 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1239 "be larger than gl_MaxCullDistances (%u)",
1240 state
->Const
.MaxClipPlanes
);
1246 * Create the constant 1, of a which is appropriate for incrementing and
1247 * decrementing values of the given GLSL type. For example, if type is vec4,
1248 * this creates a constant value of 1.0 having type float.
1250 * If the given type is invalid for increment and decrement operators, return
1251 * a floating point 1--the error will be detected later.
1254 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1256 switch (type
->base_type
) {
1257 case GLSL_TYPE_UINT
:
1258 return new(ctx
) ir_constant((unsigned) 1);
1260 return new(ctx
) ir_constant(1);
1262 case GLSL_TYPE_FLOAT
:
1263 return new(ctx
) ir_constant(1.0f
);
1268 ast_expression::hir(exec_list
*instructions
,
1269 struct _mesa_glsl_parse_state
*state
)
1271 return do_hir(instructions
, state
, true);
1275 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1276 struct _mesa_glsl_parse_state
*state
)
1278 do_hir(instructions
, state
, false);
1282 ast_expression::set_is_lhs(bool new_value
)
1284 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1285 * if we lack an identifier we can just skip it.
1287 if (this->primary_expression
.identifier
== NULL
)
1290 this->is_lhs
= new_value
;
1292 /* We need to go through the subexpressions tree to cover cases like
1293 * ast_field_selection
1295 if (this->subexpressions
[0] != NULL
)
1296 this->subexpressions
[0]->set_is_lhs(new_value
);
1300 ast_expression::do_hir(exec_list
*instructions
,
1301 struct _mesa_glsl_parse_state
*state
,
1305 static const int operations
[AST_NUM_OPERATORS
] = {
1306 -1, /* ast_assign doesn't convert to ir_expression. */
1307 -1, /* ast_plus doesn't convert to ir_expression. */
1321 ir_binop_any_nequal
,
1331 /* Note: The following block of expression types actually convert
1332 * to multiple IR instructions.
1334 ir_binop_mul
, /* ast_mul_assign */
1335 ir_binop_div
, /* ast_div_assign */
1336 ir_binop_mod
, /* ast_mod_assign */
1337 ir_binop_add
, /* ast_add_assign */
1338 ir_binop_sub
, /* ast_sub_assign */
1339 ir_binop_lshift
, /* ast_ls_assign */
1340 ir_binop_rshift
, /* ast_rs_assign */
1341 ir_binop_bit_and
, /* ast_and_assign */
1342 ir_binop_bit_xor
, /* ast_xor_assign */
1343 ir_binop_bit_or
, /* ast_or_assign */
1345 -1, /* ast_conditional doesn't convert to ir_expression. */
1346 ir_binop_add
, /* ast_pre_inc. */
1347 ir_binop_sub
, /* ast_pre_dec. */
1348 ir_binop_add
, /* ast_post_inc. */
1349 ir_binop_sub
, /* ast_post_dec. */
1350 -1, /* ast_field_selection doesn't conv to ir_expression. */
1351 -1, /* ast_array_index doesn't convert to ir_expression. */
1352 -1, /* ast_function_call doesn't conv to ir_expression. */
1353 -1, /* ast_identifier doesn't convert to ir_expression. */
1354 -1, /* ast_int_constant doesn't convert to ir_expression. */
1355 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1356 -1, /* ast_float_constant doesn't conv to ir_expression. */
1357 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1358 -1, /* ast_sequence doesn't convert to ir_expression. */
1359 -1, /* ast_aggregate shouldn't ever even get here. */
1361 ir_rvalue
*result
= NULL
;
1363 const struct glsl_type
*type
, *orig_type
;
1364 bool error_emitted
= false;
1367 loc
= this->get_location();
1369 switch (this->oper
) {
1371 assert(!"ast_aggregate: Should never get here.");
1375 this->subexpressions
[0]->set_is_lhs(true);
1376 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1377 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1380 do_assignment(instructions
, state
,
1381 this->subexpressions
[0]->non_lvalue_description
,
1382 op
[0], op
[1], &result
, needs_rvalue
, false,
1383 this->subexpressions
[0]->get_location());
1388 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1390 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1392 error_emitted
= type
->is_error();
1398 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1400 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1402 error_emitted
= type
->is_error();
1404 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1412 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1413 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1415 type
= arithmetic_result_type(op
[0], op
[1],
1416 (this->oper
== ast_mul
),
1418 error_emitted
= type
->is_error();
1420 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1425 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1426 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1428 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1430 assert(operations
[this->oper
] == ir_binop_mod
);
1432 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1434 error_emitted
= type
->is_error();
1439 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1440 error_emitted
= true;
1443 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1444 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1445 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1447 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1449 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1456 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1457 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1459 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1461 /* The relational operators must either generate an error or result
1462 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1464 assert(type
->is_error()
1465 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1466 && type
->is_scalar()));
1468 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1470 error_emitted
= type
->is_error();
1475 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1476 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1478 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1480 * "The equality operators equal (==), and not equal (!=)
1481 * operate on all types. They result in a scalar Boolean. If
1482 * the operand types do not match, then there must be a
1483 * conversion from Section 4.1.10 "Implicit Conversions"
1484 * applied to one operand that can make them match, in which
1485 * case this conversion is done."
1488 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1489 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1490 "no operation `%1$s' exists that takes a left-hand "
1491 "operand of type 'void' or a right operand of type "
1492 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1493 error_emitted
= true;
1494 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1495 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1496 || (op
[0]->type
!= op
[1]->type
)) {
1497 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1498 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1499 error_emitted
= true;
1500 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1501 !state
->check_version(120, 300, &loc
,
1502 "array comparisons forbidden")) {
1503 error_emitted
= true;
1504 } else if ((op
[0]->type
->contains_subroutine() ||
1505 op
[1]->type
->contains_subroutine())) {
1506 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1507 error_emitted
= true;
1508 } else if ((op
[0]->type
->contains_opaque() ||
1509 op
[1]->type
->contains_opaque())) {
1510 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1511 error_emitted
= true;
1514 if (error_emitted
) {
1515 result
= new(ctx
) ir_constant(false);
1517 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1518 assert(result
->type
== glsl_type::bool_type
);
1525 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1526 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1527 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1528 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1530 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1534 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1536 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1537 error_emitted
= true;
1540 if (!op
[0]->type
->is_integer()) {
1541 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1542 error_emitted
= true;
1545 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1546 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1549 case ast_logic_and
: {
1550 exec_list rhs_instructions
;
1551 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1552 "LHS", &error_emitted
);
1553 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1554 "RHS", &error_emitted
);
1556 if (rhs_instructions
.is_empty()) {
1557 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1558 type
= result
->type
;
1560 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1563 instructions
->push_tail(tmp
);
1565 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1566 instructions
->push_tail(stmt
);
1568 stmt
->then_instructions
.append_list(&rhs_instructions
);
1569 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1570 ir_assignment
*const then_assign
=
1571 new(ctx
) ir_assignment(then_deref
, op
[1]);
1572 stmt
->then_instructions
.push_tail(then_assign
);
1574 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1575 ir_assignment
*const else_assign
=
1576 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1577 stmt
->else_instructions
.push_tail(else_assign
);
1579 result
= new(ctx
) ir_dereference_variable(tmp
);
1585 case ast_logic_or
: {
1586 exec_list rhs_instructions
;
1587 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1588 "LHS", &error_emitted
);
1589 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1590 "RHS", &error_emitted
);
1592 if (rhs_instructions
.is_empty()) {
1593 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1594 type
= result
->type
;
1596 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1599 instructions
->push_tail(tmp
);
1601 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1602 instructions
->push_tail(stmt
);
1604 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1605 ir_assignment
*const then_assign
=
1606 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1607 stmt
->then_instructions
.push_tail(then_assign
);
1609 stmt
->else_instructions
.append_list(&rhs_instructions
);
1610 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1611 ir_assignment
*const else_assign
=
1612 new(ctx
) ir_assignment(else_deref
, op
[1]);
1613 stmt
->else_instructions
.push_tail(else_assign
);
1615 result
= new(ctx
) ir_dereference_variable(tmp
);
1622 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1624 * "The logical binary operators and (&&), or ( | | ), and
1625 * exclusive or (^^). They operate only on two Boolean
1626 * expressions and result in a Boolean expression."
1628 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1630 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1633 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1638 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1639 "operand", &error_emitted
);
1641 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1645 case ast_mul_assign
:
1646 case ast_div_assign
:
1647 case ast_add_assign
:
1648 case ast_sub_assign
: {
1649 this->subexpressions
[0]->set_is_lhs(true);
1650 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1651 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1653 orig_type
= op
[0]->type
;
1654 type
= arithmetic_result_type(op
[0], op
[1],
1655 (this->oper
== ast_mul_assign
),
1658 if (type
!= orig_type
) {
1659 _mesa_glsl_error(& loc
, state
,
1660 "could not implicitly convert "
1661 "%s to %s", type
->name
, orig_type
->name
);
1662 type
= glsl_type::error_type
;
1665 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1669 do_assignment(instructions
, state
,
1670 this->subexpressions
[0]->non_lvalue_description
,
1671 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1672 &result
, needs_rvalue
, false,
1673 this->subexpressions
[0]->get_location());
1675 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1676 * explicitly test for this because none of the binary expression
1677 * operators allow array operands either.
1683 case ast_mod_assign
: {
1684 this->subexpressions
[0]->set_is_lhs(true);
1685 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1686 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1688 orig_type
= op
[0]->type
;
1689 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1691 if (type
!= orig_type
) {
1692 _mesa_glsl_error(& loc
, state
,
1693 "could not implicitly convert "
1694 "%s to %s", type
->name
, orig_type
->name
);
1695 type
= glsl_type::error_type
;
1698 assert(operations
[this->oper
] == ir_binop_mod
);
1700 ir_rvalue
*temp_rhs
;
1701 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1705 do_assignment(instructions
, state
,
1706 this->subexpressions
[0]->non_lvalue_description
,
1707 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1708 &result
, needs_rvalue
, false,
1709 this->subexpressions
[0]->get_location());
1714 case ast_rs_assign
: {
1715 this->subexpressions
[0]->set_is_lhs(true);
1716 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1717 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1718 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1720 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1721 type
, op
[0], op
[1]);
1723 do_assignment(instructions
, state
,
1724 this->subexpressions
[0]->non_lvalue_description
,
1725 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1726 &result
, needs_rvalue
, false,
1727 this->subexpressions
[0]->get_location());
1731 case ast_and_assign
:
1732 case ast_xor_assign
:
1733 case ast_or_assign
: {
1734 this->subexpressions
[0]->set_is_lhs(true);
1735 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1736 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1738 orig_type
= op
[0]->type
;
1739 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1741 if (type
!= orig_type
) {
1742 _mesa_glsl_error(& loc
, state
,
1743 "could not implicitly convert "
1744 "%s to %s", type
->name
, orig_type
->name
);
1745 type
= glsl_type::error_type
;
1748 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1749 type
, op
[0], op
[1]);
1751 do_assignment(instructions
, state
,
1752 this->subexpressions
[0]->non_lvalue_description
,
1753 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1754 &result
, needs_rvalue
, false,
1755 this->subexpressions
[0]->get_location());
1759 case ast_conditional
: {
1760 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1762 * "The ternary selection operator (?:). It operates on three
1763 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1764 * first expression, which must result in a scalar Boolean."
1766 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1767 "condition", &error_emitted
);
1769 /* The :? operator is implemented by generating an anonymous temporary
1770 * followed by an if-statement. The last instruction in each branch of
1771 * the if-statement assigns a value to the anonymous temporary. This
1772 * temporary is the r-value of the expression.
1774 exec_list then_instructions
;
1775 exec_list else_instructions
;
1777 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1778 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1780 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1782 * "The second and third expressions can be any type, as
1783 * long their types match, or there is a conversion in
1784 * Section 4.1.10 "Implicit Conversions" that can be applied
1785 * to one of the expressions to make their types match. This
1786 * resulting matching type is the type of the entire
1789 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1790 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1791 || (op
[1]->type
!= op
[2]->type
)) {
1792 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1794 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1795 "operator must have matching types");
1796 error_emitted
= true;
1797 type
= glsl_type::error_type
;
1802 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1804 * "The second and third expressions must be the same type, but can
1805 * be of any type other than an array."
1807 if (type
->is_array() &&
1808 !state
->check_version(120, 300, &loc
,
1809 "second and third operands of ?: operator "
1810 "cannot be arrays")) {
1811 error_emitted
= true;
1814 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1816 * "Except for array indexing, structure member selection, and
1817 * parentheses, opaque variables are not allowed to be operands in
1818 * expressions; such use results in a compile-time error."
1820 if (type
->contains_opaque()) {
1821 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1822 "of the ?: operator");
1823 error_emitted
= true;
1826 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1828 if (then_instructions
.is_empty()
1829 && else_instructions
.is_empty()
1830 && cond_val
!= NULL
) {
1831 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1833 /* The copy to conditional_tmp reads the whole array. */
1834 if (type
->is_array()) {
1835 mark_whole_array_access(op
[1]);
1836 mark_whole_array_access(op
[2]);
1839 ir_variable
*const tmp
=
1840 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1841 instructions
->push_tail(tmp
);
1843 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1844 instructions
->push_tail(stmt
);
1846 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1847 ir_dereference
*const then_deref
=
1848 new(ctx
) ir_dereference_variable(tmp
);
1849 ir_assignment
*const then_assign
=
1850 new(ctx
) ir_assignment(then_deref
, op
[1]);
1851 stmt
->then_instructions
.push_tail(then_assign
);
1853 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1854 ir_dereference
*const else_deref
=
1855 new(ctx
) ir_dereference_variable(tmp
);
1856 ir_assignment
*const else_assign
=
1857 new(ctx
) ir_assignment(else_deref
, op
[2]);
1858 stmt
->else_instructions
.push_tail(else_assign
);
1860 result
= new(ctx
) ir_dereference_variable(tmp
);
1867 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1868 ? "pre-increment operation" : "pre-decrement operation";
1870 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1871 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1873 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1875 ir_rvalue
*temp_rhs
;
1876 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1880 do_assignment(instructions
, state
,
1881 this->subexpressions
[0]->non_lvalue_description
,
1882 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1883 &result
, needs_rvalue
, false,
1884 this->subexpressions
[0]->get_location());
1889 case ast_post_dec
: {
1890 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1891 ? "post-increment operation" : "post-decrement operation";
1892 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1893 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1895 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1897 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1899 ir_rvalue
*temp_rhs
;
1900 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1903 /* Get a temporary of a copy of the lvalue before it's modified.
1904 * This may get thrown away later.
1906 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1908 ir_rvalue
*junk_rvalue
;
1910 do_assignment(instructions
, state
,
1911 this->subexpressions
[0]->non_lvalue_description
,
1912 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1913 &junk_rvalue
, false, false,
1914 this->subexpressions
[0]->get_location());
1919 case ast_field_selection
:
1920 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1923 case ast_array_index
: {
1924 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1926 /* Getting if an array is being used uninitialized is beyond what we get
1927 * from ir_value.data.assigned. Setting is_lhs as true would force to
1928 * not raise a uninitialized warning when using an array
1930 subexpressions
[0]->set_is_lhs(true);
1931 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1932 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1934 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1937 if (result
->type
->is_error())
1938 error_emitted
= true;
1943 case ast_unsized_array_dim
:
1944 assert(!"ast_unsized_array_dim: Should never get here.");
1947 case ast_function_call
:
1948 /* Should *NEVER* get here. ast_function_call should always be handled
1949 * by ast_function_expression::hir.
1954 case ast_identifier
: {
1955 /* ast_identifier can appear several places in a full abstract syntax
1956 * tree. This particular use must be at location specified in the grammar
1957 * as 'variable_identifier'.
1960 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1963 /* the identifier might be a subroutine name */
1965 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
1966 var
= state
->symbols
->get_variable(sub_name
);
1967 ralloc_free(sub_name
);
1971 var
->data
.used
= true;
1972 result
= new(ctx
) ir_dereference_variable(var
);
1974 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
1976 && result
->variable_referenced()->data
.assigned
!= true
1977 && !is_gl_identifier(var
->name
)) {
1978 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
1979 this->primary_expression
.identifier
);
1982 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1983 this->primary_expression
.identifier
);
1985 result
= ir_rvalue::error_value(ctx
);
1986 error_emitted
= true;
1991 case ast_int_constant
:
1992 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1995 case ast_uint_constant
:
1996 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1999 case ast_float_constant
:
2000 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
2003 case ast_bool_constant
:
2004 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2007 case ast_double_constant
:
2008 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2011 case ast_sequence
: {
2012 /* It should not be possible to generate a sequence in the AST without
2013 * any expressions in it.
2015 assert(!this->expressions
.is_empty());
2017 /* The r-value of a sequence is the last expression in the sequence. If
2018 * the other expressions in the sequence do not have side-effects (and
2019 * therefore add instructions to the instruction list), they get dropped
2022 exec_node
*previous_tail
= NULL
;
2023 YYLTYPE previous_operand_loc
= loc
;
2025 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2026 /* If one of the operands of comma operator does not generate any
2027 * code, we want to emit a warning. At each pass through the loop
2028 * previous_tail will point to the last instruction in the stream
2029 * *before* processing the previous operand. Naturally,
2030 * instructions->get_tail_raw() will point to the last instruction in
2031 * the stream *after* processing the previous operand. If the two
2032 * pointers match, then the previous operand had no effect.
2034 * The warning behavior here differs slightly from GCC. GCC will
2035 * only emit a warning if none of the left-hand operands have an
2036 * effect. However, it will emit a warning for each. I believe that
2037 * there are some cases in C (especially with GCC extensions) where
2038 * it is useful to have an intermediate step in a sequence have no
2039 * effect, but I don't think these cases exist in GLSL. Either way,
2040 * it would be a giant hassle to replicate that behavior.
2042 if (previous_tail
== instructions
->get_tail_raw()) {
2043 _mesa_glsl_warning(&previous_operand_loc
, state
,
2044 "left-hand operand of comma expression has "
2048 /* The tail is directly accessed instead of using the get_tail()
2049 * method for performance reasons. get_tail() has extra code to
2050 * return NULL when the list is empty. We don't care about that
2051 * here, so using get_tail_raw() is fine.
2053 previous_tail
= instructions
->get_tail_raw();
2054 previous_operand_loc
= ast
->get_location();
2056 result
= ast
->hir(instructions
, state
);
2059 /* Any errors should have already been emitted in the loop above.
2061 error_emitted
= true;
2065 type
= NULL
; /* use result->type, not type. */
2066 assert(result
!= NULL
|| !needs_rvalue
);
2068 if (result
&& result
->type
->is_error() && !error_emitted
)
2069 _mesa_glsl_error(& loc
, state
, "type mismatch");
2075 ast_expression::has_sequence_subexpression() const
2077 switch (this->oper
) {
2086 return this->subexpressions
[0]->has_sequence_subexpression();
2108 case ast_array_index
:
2109 case ast_mul_assign
:
2110 case ast_div_assign
:
2111 case ast_add_assign
:
2112 case ast_sub_assign
:
2113 case ast_mod_assign
:
2116 case ast_and_assign
:
2117 case ast_xor_assign
:
2119 return this->subexpressions
[0]->has_sequence_subexpression() ||
2120 this->subexpressions
[1]->has_sequence_subexpression();
2122 case ast_conditional
:
2123 return this->subexpressions
[0]->has_sequence_subexpression() ||
2124 this->subexpressions
[1]->has_sequence_subexpression() ||
2125 this->subexpressions
[2]->has_sequence_subexpression();
2130 case ast_field_selection
:
2131 case ast_identifier
:
2132 case ast_int_constant
:
2133 case ast_uint_constant
:
2134 case ast_float_constant
:
2135 case ast_bool_constant
:
2136 case ast_double_constant
:
2142 case ast_function_call
:
2143 unreachable("should be handled by ast_function_expression::hir");
2145 case ast_unsized_array_dim
:
2146 unreachable("ast_unsized_array_dim: Should never get here.");
2153 ast_expression_statement::hir(exec_list
*instructions
,
2154 struct _mesa_glsl_parse_state
*state
)
2156 /* It is possible to have expression statements that don't have an
2157 * expression. This is the solitary semicolon:
2159 * for (i = 0; i < 5; i++)
2162 * In this case the expression will be NULL. Test for NULL and don't do
2163 * anything in that case.
2165 if (expression
!= NULL
)
2166 expression
->hir_no_rvalue(instructions
, state
);
2168 /* Statements do not have r-values.
2175 ast_compound_statement::hir(exec_list
*instructions
,
2176 struct _mesa_glsl_parse_state
*state
)
2179 state
->symbols
->push_scope();
2181 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2182 ast
->hir(instructions
, state
);
2185 state
->symbols
->pop_scope();
2187 /* Compound statements do not have r-values.
2193 * Evaluate the given exec_node (which should be an ast_node representing
2194 * a single array dimension) and return its integer value.
2197 process_array_size(exec_node
*node
,
2198 struct _mesa_glsl_parse_state
*state
)
2200 exec_list dummy_instructions
;
2202 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2205 * Dimensions other than the outermost dimension can by unsized if they
2206 * are immediately sized by a constructor or initializer.
2208 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2211 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2212 YYLTYPE loc
= array_size
->get_location();
2215 _mesa_glsl_error(& loc
, state
,
2216 "array size could not be resolved");
2220 if (!ir
->type
->is_integer()) {
2221 _mesa_glsl_error(& loc
, state
,
2222 "array size must be integer type");
2226 if (!ir
->type
->is_scalar()) {
2227 _mesa_glsl_error(& loc
, state
,
2228 "array size must be scalar type");
2232 ir_constant
*const size
= ir
->constant_expression_value();
2234 (state
->is_version(120, 300) &&
2235 array_size
->has_sequence_subexpression())) {
2236 _mesa_glsl_error(& loc
, state
, "array size must be a "
2237 "constant valued expression");
2241 if (size
->value
.i
[0] <= 0) {
2242 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2246 assert(size
->type
== ir
->type
);
2248 /* If the array size is const (and we've verified that
2249 * it is) then no instructions should have been emitted
2250 * when we converted it to HIR. If they were emitted,
2251 * then either the array size isn't const after all, or
2252 * we are emitting unnecessary instructions.
2254 assert(dummy_instructions
.is_empty());
2256 return size
->value
.u
[0];
2259 static const glsl_type
*
2260 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2261 ast_array_specifier
*array_specifier
,
2262 struct _mesa_glsl_parse_state
*state
)
2264 const glsl_type
*array_type
= base
;
2266 if (array_specifier
!= NULL
) {
2267 if (base
->is_array()) {
2269 /* From page 19 (page 25) of the GLSL 1.20 spec:
2271 * "Only one-dimensional arrays may be declared."
2273 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2274 return glsl_type::error_type
;
2278 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2279 !node
->is_head_sentinel(); node
= node
->prev
) {
2280 unsigned array_size
= process_array_size(node
, state
);
2281 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2289 precision_qualifier_allowed(const glsl_type
*type
)
2291 /* Precision qualifiers apply to floating point, integer and opaque
2294 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2295 * "Any floating point or any integer declaration can have the type
2296 * preceded by one of these precision qualifiers [...] Literal
2297 * constants do not have precision qualifiers. Neither do Boolean
2300 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2303 * "Precision qualifiers are added for code portability with OpenGL
2304 * ES, not for functionality. They have the same syntax as in OpenGL
2307 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2309 * "uniform lowp sampler2D sampler;
2312 * lowp vec4 col = texture2D (sampler, coord);
2313 * // texture2D returns lowp"
2315 * From this, we infer that GLSL 1.30 (and later) should allow precision
2316 * qualifiers on sampler types just like float and integer types.
2318 const glsl_type
*const t
= type
->without_array();
2320 return (t
->is_float() || t
->is_integer() || t
->contains_opaque()) &&
2325 ast_type_specifier::glsl_type(const char **name
,
2326 struct _mesa_glsl_parse_state
*state
) const
2328 const struct glsl_type
*type
;
2330 type
= state
->symbols
->get_type(this->type_name
);
2331 *name
= this->type_name
;
2333 YYLTYPE loc
= this->get_location();
2334 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2340 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2342 * "The precision statement
2344 * precision precision-qualifier type;
2346 * can be used to establish a default precision qualifier. The type field can
2347 * be either int or float or any of the sampler types, (...) If type is float,
2348 * the directive applies to non-precision-qualified floating point type
2349 * (scalar, vector, and matrix) declarations. If type is int, the directive
2350 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2351 * and unsigned) declarations."
2353 * We use the symbol table to keep the values of the default precisions for
2354 * each 'type' in each scope and we use the 'type' string from the precision
2355 * statement as key in the symbol table. When we want to retrieve the default
2356 * precision associated with a given glsl_type we need to know the type string
2357 * associated with it. This is what this function returns.
2360 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2362 switch (type
->base_type
) {
2363 case GLSL_TYPE_FLOAT
:
2365 case GLSL_TYPE_UINT
:
2368 case GLSL_TYPE_ATOMIC_UINT
:
2369 return "atomic_uint";
2370 case GLSL_TYPE_IMAGE
:
2372 case GLSL_TYPE_SAMPLER
: {
2373 const unsigned type_idx
=
2374 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2375 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2376 assert(type_idx
< 4);
2377 switch (type
->sampled_type
) {
2378 case GLSL_TYPE_FLOAT
:
2379 switch (type
->sampler_dimensionality
) {
2380 case GLSL_SAMPLER_DIM_1D
: {
2381 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2382 static const char *const names
[4] = {
2383 "sampler1D", "sampler1DArray",
2384 "sampler1DShadow", "sampler1DArrayShadow"
2386 return names
[type_idx
];
2388 case GLSL_SAMPLER_DIM_2D
: {
2389 static const char *const names
[8] = {
2390 "sampler2D", "sampler2DArray",
2391 "sampler2DShadow", "sampler2DArrayShadow",
2392 "image2D", "image2DArray", NULL
, NULL
2394 return names
[offset
+ type_idx
];
2396 case GLSL_SAMPLER_DIM_3D
: {
2397 static const char *const names
[8] = {
2398 "sampler3D", NULL
, NULL
, NULL
,
2399 "image3D", NULL
, NULL
, NULL
2401 return names
[offset
+ type_idx
];
2403 case GLSL_SAMPLER_DIM_CUBE
: {
2404 static const char *const names
[8] = {
2405 "samplerCube", "samplerCubeArray",
2406 "samplerCubeShadow", "samplerCubeArrayShadow",
2407 "imageCube", NULL
, NULL
, NULL
2409 return names
[offset
+ type_idx
];
2411 case GLSL_SAMPLER_DIM_MS
: {
2412 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2413 static const char *const names
[4] = {
2414 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2416 return names
[type_idx
];
2418 case GLSL_SAMPLER_DIM_RECT
: {
2419 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2420 static const char *const names
[4] = {
2421 "samplerRect", NULL
, "samplerRectShadow", NULL
2423 return names
[type_idx
];
2425 case GLSL_SAMPLER_DIM_BUF
: {
2426 static const char *const names
[8] = {
2427 "samplerBuffer", NULL
, NULL
, NULL
,
2428 "imageBuffer", NULL
, NULL
, NULL
2430 return names
[offset
+ type_idx
];
2432 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2433 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2434 static const char *const names
[4] = {
2435 "samplerExternalOES", NULL
, NULL
, NULL
2437 return names
[type_idx
];
2440 unreachable("Unsupported sampler/image dimensionality");
2441 } /* sampler/image float dimensionality */
2444 switch (type
->sampler_dimensionality
) {
2445 case GLSL_SAMPLER_DIM_1D
: {
2446 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2447 static const char *const names
[4] = {
2448 "isampler1D", "isampler1DArray", NULL
, NULL
2450 return names
[type_idx
];
2452 case GLSL_SAMPLER_DIM_2D
: {
2453 static const char *const names
[8] = {
2454 "isampler2D", "isampler2DArray", NULL
, NULL
,
2455 "iimage2D", "iimage2DArray", NULL
, NULL
2457 return names
[offset
+ type_idx
];
2459 case GLSL_SAMPLER_DIM_3D
: {
2460 static const char *const names
[8] = {
2461 "isampler3D", NULL
, NULL
, NULL
,
2462 "iimage3D", NULL
, NULL
, NULL
2464 return names
[offset
+ type_idx
];
2466 case GLSL_SAMPLER_DIM_CUBE
: {
2467 static const char *const names
[8] = {
2468 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2469 "iimageCube", NULL
, NULL
, NULL
2471 return names
[offset
+ type_idx
];
2473 case GLSL_SAMPLER_DIM_MS
: {
2474 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2475 static const char *const names
[4] = {
2476 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2478 return names
[type_idx
];
2480 case GLSL_SAMPLER_DIM_RECT
: {
2481 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2482 static const char *const names
[4] = {
2483 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2485 return names
[type_idx
];
2487 case GLSL_SAMPLER_DIM_BUF
: {
2488 static const char *const names
[8] = {
2489 "isamplerBuffer", NULL
, NULL
, NULL
,
2490 "iimageBuffer", NULL
, NULL
, NULL
2492 return names
[offset
+ type_idx
];
2495 unreachable("Unsupported isampler/iimage dimensionality");
2496 } /* sampler/image int dimensionality */
2498 case GLSL_TYPE_UINT
:
2499 switch (type
->sampler_dimensionality
) {
2500 case GLSL_SAMPLER_DIM_1D
: {
2501 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2502 static const char *const names
[4] = {
2503 "usampler1D", "usampler1DArray", NULL
, NULL
2505 return names
[type_idx
];
2507 case GLSL_SAMPLER_DIM_2D
: {
2508 static const char *const names
[8] = {
2509 "usampler2D", "usampler2DArray", NULL
, NULL
,
2510 "uimage2D", "uimage2DArray", NULL
, NULL
2512 return names
[offset
+ type_idx
];
2514 case GLSL_SAMPLER_DIM_3D
: {
2515 static const char *const names
[8] = {
2516 "usampler3D", NULL
, NULL
, NULL
,
2517 "uimage3D", NULL
, NULL
, NULL
2519 return names
[offset
+ type_idx
];
2521 case GLSL_SAMPLER_DIM_CUBE
: {
2522 static const char *const names
[8] = {
2523 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2524 "uimageCube", NULL
, NULL
, NULL
2526 return names
[offset
+ type_idx
];
2528 case GLSL_SAMPLER_DIM_MS
: {
2529 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2530 static const char *const names
[4] = {
2531 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2533 return names
[type_idx
];
2535 case GLSL_SAMPLER_DIM_RECT
: {
2536 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2537 static const char *const names
[4] = {
2538 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2540 return names
[type_idx
];
2542 case GLSL_SAMPLER_DIM_BUF
: {
2543 static const char *const names
[8] = {
2544 "usamplerBuffer", NULL
, NULL
, NULL
,
2545 "uimageBuffer", NULL
, NULL
, NULL
2547 return names
[offset
+ type_idx
];
2550 unreachable("Unsupported usampler/uimage dimensionality");
2551 } /* sampler/image uint dimensionality */
2554 unreachable("Unsupported sampler/image type");
2555 } /* sampler/image type */
2557 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2560 unreachable("Unsupported type");
2565 select_gles_precision(unsigned qual_precision
,
2566 const glsl_type
*type
,
2567 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2569 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2570 * In GLES we take the precision from the type qualifier if present,
2571 * otherwise, if the type of the variable allows precision qualifiers at
2572 * all, we look for the default precision qualifier for that type in the
2575 assert(state
->es_shader
);
2577 unsigned precision
= GLSL_PRECISION_NONE
;
2578 if (qual_precision
) {
2579 precision
= qual_precision
;
2580 } else if (precision_qualifier_allowed(type
)) {
2581 const char *type_name
=
2582 get_type_name_for_precision_qualifier(type
->without_array());
2583 assert(type_name
!= NULL
);
2586 state
->symbols
->get_default_precision_qualifier(type_name
);
2587 if (precision
== ast_precision_none
) {
2588 _mesa_glsl_error(loc
, state
,
2589 "No precision specified in this scope for type `%s'",
2595 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2597 * "The default precision of all atomic types is highp. It is an error to
2598 * declare an atomic type with a different precision or to specify the
2599 * default precision for an atomic type to be lowp or mediump."
2601 if (type
->base_type
== GLSL_TYPE_ATOMIC_UINT
&&
2602 precision
!= ast_precision_high
) {
2603 _mesa_glsl_error(loc
, state
,
2604 "atomic_uint can only have highp precision qualifier");
2611 ast_fully_specified_type::glsl_type(const char **name
,
2612 struct _mesa_glsl_parse_state
*state
) const
2614 return this->specifier
->glsl_type(name
, state
);
2618 * Determine whether a toplevel variable declaration declares a varying. This
2619 * function operates by examining the variable's mode and the shader target,
2620 * so it correctly identifies linkage variables regardless of whether they are
2621 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2623 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2624 * this function will produce undefined results.
2627 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2630 case MESA_SHADER_VERTEX
:
2631 return var
->data
.mode
== ir_var_shader_out
;
2632 case MESA_SHADER_FRAGMENT
:
2633 return var
->data
.mode
== ir_var_shader_in
;
2635 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2640 is_allowed_invariant(ir_variable
*var
, struct _mesa_glsl_parse_state
*state
)
2642 if (is_varying_var(var
, state
->stage
))
2645 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
2646 * "Only variables output from a vertex shader can be candidates
2649 if (!state
->is_version(130, 0))
2653 * Later specs remove this language - so allowed invariant
2654 * on fragment shader outputs as well.
2656 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
2657 var
->data
.mode
== ir_var_shader_out
)
2663 * Matrix layout qualifiers are only allowed on certain types
2666 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2668 const glsl_type
*type
,
2671 if (var
&& !var
->is_in_buffer_block()) {
2672 /* Layout qualifiers may only apply to interface blocks and fields in
2675 _mesa_glsl_error(loc
, state
,
2676 "uniform block layout qualifiers row_major and "
2677 "column_major may not be applied to variables "
2678 "outside of uniform blocks");
2679 } else if (!type
->without_array()->is_matrix()) {
2680 /* The OpenGL ES 3.0 conformance tests did not originally allow
2681 * matrix layout qualifiers on non-matrices. However, the OpenGL
2682 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2683 * amended to specifically allow these layouts on all types. Emit
2684 * a warning so that people know their code may not be portable.
2686 _mesa_glsl_warning(loc
, state
,
2687 "uniform block layout qualifiers row_major and "
2688 "column_major applied to non-matrix types may "
2689 "be rejected by older compilers");
2694 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2695 struct _mesa_glsl_parse_state
*state
,
2696 unsigned xfb_buffer
) {
2697 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2698 _mesa_glsl_error(loc
, state
,
2699 "invalid xfb_buffer specified %d is larger than "
2700 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2702 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2709 /* From the ARB_enhanced_layouts spec:
2711 * "Variables and block members qualified with *xfb_offset* can be
2712 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2713 * The offset must be a multiple of the size of the first component of
2714 * the first qualified variable or block member, or a compile-time error
2715 * results. Further, if applied to an aggregate containing a double,
2716 * the offset must also be a multiple of 8, and the space taken in the
2717 * buffer will be a multiple of 8.
2720 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2721 struct _mesa_glsl_parse_state
*state
,
2722 int xfb_offset
, const glsl_type
*type
,
2723 unsigned component_size
) {
2724 const glsl_type
*t_without_array
= type
->without_array();
2726 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2727 _mesa_glsl_error(loc
, state
,
2728 "xfb_offset can't be used with unsized arrays.");
2732 /* Make sure nested structs don't contain unsized arrays, and validate
2733 * any xfb_offsets on interface members.
2735 if (t_without_array
->is_record() || t_without_array
->is_interface())
2736 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2737 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2739 /* When the interface block doesn't have an xfb_offset qualifier then
2740 * we apply the component size rules at the member level.
2742 if (xfb_offset
== -1)
2743 component_size
= member_t
->contains_double() ? 8 : 4;
2745 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2746 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2750 /* Nested structs or interface block without offset may not have had an
2751 * offset applied yet so return.
2753 if (xfb_offset
== -1) {
2757 if (xfb_offset
% component_size
) {
2758 _mesa_glsl_error(loc
, state
,
2759 "invalid qualifier xfb_offset=%d must be a multiple "
2760 "of the first component size of the first qualified "
2761 "variable or block member. Or double if an aggregate "
2762 "that contains a double (%d).",
2763 xfb_offset
, component_size
);
2771 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2774 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2775 _mesa_glsl_error(loc
, state
,
2776 "invalid stream specified %d is larger than "
2777 "MAX_VERTEX_STREAMS - 1 (%d).",
2778 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2786 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2789 const glsl_type
*type
,
2790 const ast_type_qualifier
*qual
)
2792 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2793 _mesa_glsl_error(loc
, state
,
2794 "the \"binding\" qualifier only applies to uniforms and "
2795 "shader storage buffer objects");
2799 unsigned qual_binding
;
2800 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2805 const struct gl_context
*const ctx
= state
->ctx
;
2806 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2807 unsigned max_index
= qual_binding
+ elements
- 1;
2808 const glsl_type
*base_type
= type
->without_array();
2810 if (base_type
->is_interface()) {
2811 /* UBOs. From page 60 of the GLSL 4.20 specification:
2812 * "If the binding point for any uniform block instance is less than zero,
2813 * or greater than or equal to the implementation-dependent maximum
2814 * number of uniform buffer bindings, a compilation error will occur.
2815 * When the binding identifier is used with a uniform block instanced as
2816 * an array of size N, all elements of the array from binding through
2817 * binding + N – 1 must be within this range."
2819 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2821 if (qual
->flags
.q
.uniform
&&
2822 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2823 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2824 "the maximum number of UBO binding points (%d)",
2825 qual_binding
, elements
,
2826 ctx
->Const
.MaxUniformBufferBindings
);
2830 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2831 * "If the binding point for any uniform or shader storage block instance
2832 * is less than zero, or greater than or equal to the
2833 * implementation-dependent maximum number of uniform buffer bindings, a
2834 * compile-time error will occur. When the binding identifier is used
2835 * with a uniform or shader storage block instanced as an array of size
2836 * N, all elements of the array from binding through binding + N – 1 must
2837 * be within this range."
2839 if (qual
->flags
.q
.buffer
&&
2840 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2841 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2842 "the maximum number of SSBO binding points (%d)",
2843 qual_binding
, elements
,
2844 ctx
->Const
.MaxShaderStorageBufferBindings
);
2847 } else if (base_type
->is_sampler()) {
2848 /* Samplers. From page 63 of the GLSL 4.20 specification:
2849 * "If the binding is less than zero, or greater than or equal to the
2850 * implementation-dependent maximum supported number of units, a
2851 * compilation error will occur. When the binding identifier is used
2852 * with an array of size N, all elements of the array from binding
2853 * through binding + N - 1 must be within this range."
2855 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2857 if (max_index
>= limit
) {
2858 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2859 "exceeds the maximum number of texture image units "
2860 "(%u)", qual_binding
, elements
, limit
);
2864 } else if (base_type
->contains_atomic()) {
2865 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2866 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2867 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2868 " maximum number of atomic counter buffer bindings"
2869 "(%u)", qual_binding
,
2870 ctx
->Const
.MaxAtomicBufferBindings
);
2874 } else if ((state
->is_version(420, 310) ||
2875 state
->ARB_shading_language_420pack_enable
) &&
2876 base_type
->is_image()) {
2877 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2878 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2879 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2880 " maximum number of image units (%d)", max_index
,
2881 ctx
->Const
.MaxImageUnits
);
2886 _mesa_glsl_error(loc
, state
,
2887 "the \"binding\" qualifier only applies to uniform "
2888 "blocks, opaque variables, or arrays thereof");
2892 var
->data
.explicit_binding
= true;
2893 var
->data
.binding
= qual_binding
;
2900 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
2902 const glsl_interp_mode interpolation
,
2903 const struct ast_type_qualifier
*qual
,
2904 const struct glsl_type
*var_type
,
2905 ir_variable_mode mode
)
2907 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
2908 * not to vertex shader inputs nor fragment shader outputs.
2910 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2911 * "Outputs from a vertex shader (out) and inputs to a fragment
2912 * shader (in) can be further qualified with one or more of these
2913 * interpolation qualifiers"
2915 * "These interpolation qualifiers may only precede the qualifiers in,
2916 * centroid in, out, or centroid out in a declaration. They do not apply
2917 * to the deprecated storage qualifiers varying or centroid
2918 * varying. They also do not apply to inputs into a vertex shader or
2919 * outputs from a fragment shader."
2921 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
2922 * "Outputs from a shader (out) and inputs to a shader (in) can be
2923 * further qualified with one of these interpolation qualifiers."
2925 * "These interpolation qualifiers may only precede the qualifiers
2926 * in, centroid in, out, or centroid out in a declaration. They do
2927 * not apply to inputs into a vertex shader or outputs from a
2930 if (state
->is_version(130, 300)
2931 && interpolation
!= INTERP_MODE_NONE
) {
2932 const char *i
= interpolation_string(interpolation
);
2933 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
2934 _mesa_glsl_error(loc
, state
,
2935 "interpolation qualifier `%s' can only be applied to "
2936 "shader inputs or outputs.", i
);
2938 switch (state
->stage
) {
2939 case MESA_SHADER_VERTEX
:
2940 if (mode
== ir_var_shader_in
) {
2941 _mesa_glsl_error(loc
, state
,
2942 "interpolation qualifier '%s' cannot be applied to "
2943 "vertex shader inputs", i
);
2946 case MESA_SHADER_FRAGMENT
:
2947 if (mode
== ir_var_shader_out
) {
2948 _mesa_glsl_error(loc
, state
,
2949 "interpolation qualifier '%s' cannot be applied to "
2950 "fragment shader outputs", i
);
2958 /* Interpolation qualifiers cannot be applied to 'centroid' and
2959 * 'centroid varying'.
2961 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2962 * "interpolation qualifiers may only precede the qualifiers in,
2963 * centroid in, out, or centroid out in a declaration. They do not apply
2964 * to the deprecated storage qualifiers varying or centroid varying."
2966 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2968 if (state
->is_version(130, 0)
2969 && interpolation
!= INTERP_MODE_NONE
2970 && qual
->flags
.q
.varying
) {
2972 const char *i
= interpolation_string(interpolation
);
2974 if (qual
->flags
.q
.centroid
)
2975 s
= "centroid varying";
2979 _mesa_glsl_error(loc
, state
,
2980 "qualifier '%s' cannot be applied to the "
2981 "deprecated storage qualifier '%s'", i
, s
);
2984 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2985 * so must integer vertex outputs.
2987 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2988 * "Fragment shader inputs that are signed or unsigned integers or
2989 * integer vectors must be qualified with the interpolation qualifier
2992 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2993 * "Fragment shader inputs that are, or contain, signed or unsigned
2994 * integers or integer vectors must be qualified with the
2995 * interpolation qualifier flat."
2997 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2998 * "Vertex shader outputs that are, or contain, signed or unsigned
2999 * integers or integer vectors must be qualified with the
3000 * interpolation qualifier flat."
3002 * Note that prior to GLSL 1.50, this requirement applied to vertex
3003 * outputs rather than fragment inputs. That creates problems in the
3004 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3005 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3006 * apply the restriction to both vertex outputs and fragment inputs.
3008 * Note also that the desktop GLSL specs are missing the text "or
3009 * contain"; this is presumably an oversight, since there is no
3010 * reasonable way to interpolate a fragment shader input that contains
3011 * an integer. See Khronos bug #15671.
3013 if (state
->is_version(130, 300)
3014 && var_type
->contains_integer()
3015 && interpolation
!= INTERP_MODE_FLAT
3016 && state
->stage
== MESA_SHADER_FRAGMENT
3017 && mode
== ir_var_shader_in
) {
3018 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3019 "an integer, then it must be qualified with 'flat'");
3022 /* Double fragment inputs must be qualified with 'flat'.
3024 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
3025 * "This extension does not support interpolation of double-precision
3026 * values; doubles used as fragment shader inputs must be qualified as
3029 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
3030 * "Fragment shader inputs that are signed or unsigned integers, integer
3031 * vectors, or any double-precision floating-point type must be
3032 * qualified with the interpolation qualifier flat."
3034 * Note that the GLSL specs are missing the text "or contain"; this is
3035 * presumably an oversight. See Khronos bug #15671.
3037 * The 'double' type does not exist in GLSL ES so far.
3039 if (state
->has_double()
3040 && var_type
->contains_double()
3041 && interpolation
!= INTERP_MODE_FLAT
3042 && state
->stage
== MESA_SHADER_FRAGMENT
3043 && mode
== ir_var_shader_in
) {
3044 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3045 "a double, then it must be qualified with 'flat'");
3049 static glsl_interp_mode
3050 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3051 const struct glsl_type
*var_type
,
3052 ir_variable_mode mode
,
3053 struct _mesa_glsl_parse_state
*state
,
3056 glsl_interp_mode interpolation
;
3057 if (qual
->flags
.q
.flat
)
3058 interpolation
= INTERP_MODE_FLAT
;
3059 else if (qual
->flags
.q
.noperspective
)
3060 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3061 else if (qual
->flags
.q
.smooth
)
3062 interpolation
= INTERP_MODE_SMOOTH
;
3063 else if (state
->es_shader
&&
3064 ((mode
== ir_var_shader_in
&&
3065 state
->stage
!= MESA_SHADER_VERTEX
) ||
3066 (mode
== ir_var_shader_out
&&
3067 state
->stage
!= MESA_SHADER_FRAGMENT
)))
3068 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
3070 * "When no interpolation qualifier is present, smooth interpolation
3073 interpolation
= INTERP_MODE_SMOOTH
;
3075 interpolation
= INTERP_MODE_NONE
;
3077 validate_interpolation_qualifier(state
, loc
,
3079 qual
, var_type
, mode
);
3081 return interpolation
;
3086 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3088 struct _mesa_glsl_parse_state
*state
,
3093 unsigned qual_location
;
3094 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3099 /* Checks for GL_ARB_explicit_uniform_location. */
3100 if (qual
->flags
.q
.uniform
) {
3101 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3104 const struct gl_context
*const ctx
= state
->ctx
;
3105 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3107 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3108 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3109 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3110 ctx
->Const
.MaxUserAssignableUniformLocations
);
3114 var
->data
.explicit_location
= true;
3115 var
->data
.location
= qual_location
;
3119 /* Between GL_ARB_explicit_attrib_location an
3120 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3121 * stage can be assigned explicit locations. The checking here associates
3122 * the correct extension with the correct stage's input / output:
3126 * vertex explicit_loc sso
3127 * tess control sso sso
3130 * fragment sso explicit_loc
3132 switch (state
->stage
) {
3133 case MESA_SHADER_VERTEX
:
3134 if (var
->data
.mode
== ir_var_shader_in
) {
3135 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3141 if (var
->data
.mode
== ir_var_shader_out
) {
3142 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3151 case MESA_SHADER_TESS_CTRL
:
3152 case MESA_SHADER_TESS_EVAL
:
3153 case MESA_SHADER_GEOMETRY
:
3154 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3155 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3164 case MESA_SHADER_FRAGMENT
:
3165 if (var
->data
.mode
== ir_var_shader_in
) {
3166 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3172 if (var
->data
.mode
== ir_var_shader_out
) {
3173 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3182 case MESA_SHADER_COMPUTE
:
3183 _mesa_glsl_error(loc
, state
,
3184 "compute shader variables cannot be given "
3185 "explicit locations");
3190 _mesa_glsl_error(loc
, state
,
3191 "%s cannot be given an explicit location in %s shader",
3193 _mesa_shader_stage_to_string(state
->stage
));
3195 var
->data
.explicit_location
= true;
3197 switch (state
->stage
) {
3198 case MESA_SHADER_VERTEX
:
3199 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3200 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3201 : (qual_location
+ VARYING_SLOT_VAR0
);
3204 case MESA_SHADER_TESS_CTRL
:
3205 case MESA_SHADER_TESS_EVAL
:
3206 case MESA_SHADER_GEOMETRY
:
3207 if (var
->data
.patch
)
3208 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3210 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3213 case MESA_SHADER_FRAGMENT
:
3214 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3215 ? (qual_location
+ FRAG_RESULT_DATA0
)
3216 : (qual_location
+ VARYING_SLOT_VAR0
);
3218 case MESA_SHADER_COMPUTE
:
3219 assert(!"Unexpected shader type");
3223 /* Check if index was set for the uniform instead of the function */
3224 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
3225 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3226 "used with subroutine functions");
3230 unsigned qual_index
;
3231 if (qual
->flags
.q
.explicit_index
&&
3232 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3234 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3235 * Layout Qualifiers):
3237 * "It is also a compile-time error if a fragment shader
3238 * sets a layout index to less than 0 or greater than 1."
3240 * Older specifications don't mandate a behavior; we take
3241 * this as a clarification and always generate the error.
3243 if (qual_index
> 1) {
3244 _mesa_glsl_error(loc
, state
,
3245 "explicit index may only be 0 or 1");
3247 var
->data
.explicit_index
= true;
3248 var
->data
.index
= qual_index
;
3255 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3257 struct _mesa_glsl_parse_state
*state
,
3260 const glsl_type
*base_type
= var
->type
->without_array();
3262 if (base_type
->is_image()) {
3263 if (var
->data
.mode
!= ir_var_uniform
&&
3264 var
->data
.mode
!= ir_var_function_in
) {
3265 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3266 "function parameters or uniform-qualified "
3267 "global variables");
3270 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
3271 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
3272 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
3273 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
3274 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
3275 var
->data
.read_only
= true;
3277 if (qual
->flags
.q
.explicit_image_format
) {
3278 if (var
->data
.mode
== ir_var_function_in
) {
3279 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
3280 "used on image function parameters");
3283 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3284 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
3285 "base data type of the image");
3288 var
->data
.image_format
= qual
->image_format
;
3290 if (var
->data
.mode
== ir_var_uniform
) {
3291 if (state
->es_shader
) {
3292 _mesa_glsl_error(loc
, state
, "all image uniforms "
3293 "must have a format layout qualifier");
3295 } else if (!qual
->flags
.q
.write_only
) {
3296 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3297 "`writeonly' must have a format layout "
3302 var
->data
.image_format
= GL_NONE
;
3305 /* From page 70 of the GLSL ES 3.1 specification:
3307 * "Except for image variables qualified with the format qualifiers
3308 * r32f, r32i, and r32ui, image variables must specify either memory
3309 * qualifier readonly or the memory qualifier writeonly."
3311 if (state
->es_shader
&&
3312 var
->data
.image_format
!= GL_R32F
&&
3313 var
->data
.image_format
!= GL_R32I
&&
3314 var
->data
.image_format
!= GL_R32UI
&&
3315 !var
->data
.image_read_only
&&
3316 !var
->data
.image_write_only
) {
3317 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3318 "r32f, r32i or r32ui must be qualified `readonly' or "
3322 } else if (qual
->flags
.q
.read_only
||
3323 qual
->flags
.q
.write_only
||
3324 qual
->flags
.q
.coherent
||
3325 qual
->flags
.q
._volatile
||
3326 qual
->flags
.q
.restrict_flag
||
3327 qual
->flags
.q
.explicit_image_format
) {
3328 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3333 static inline const char*
3334 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3336 if (origin_upper_left
&& pixel_center_integer
)
3337 return "origin_upper_left, pixel_center_integer";
3338 else if (origin_upper_left
)
3339 return "origin_upper_left";
3340 else if (pixel_center_integer
)
3341 return "pixel_center_integer";
3347 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3348 const struct ast_type_qualifier
*qual
)
3350 /* If gl_FragCoord was previously declared, and the qualifiers were
3351 * different in any way, return true.
3353 if (state
->fs_redeclares_gl_fragcoord
) {
3354 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3355 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3362 validate_array_dimensions(const glsl_type
*t
,
3363 struct _mesa_glsl_parse_state
*state
,
3365 if (t
->is_array()) {
3366 t
= t
->fields
.array
;
3367 while (t
->is_array()) {
3368 if (t
->is_unsized_array()) {
3369 _mesa_glsl_error(loc
, state
,
3370 "only the outermost array dimension can "
3375 t
= t
->fields
.array
;
3381 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3383 struct _mesa_glsl_parse_state
*state
,
3386 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3388 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3390 * "Within any shader, the first redeclarations of gl_FragCoord
3391 * must appear before any use of gl_FragCoord."
3393 * Generate a compiler error if above condition is not met by the
3396 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3397 if (earlier
!= NULL
&&
3398 earlier
->data
.used
&&
3399 !state
->fs_redeclares_gl_fragcoord
) {
3400 _mesa_glsl_error(loc
, state
,
3401 "gl_FragCoord used before its first redeclaration "
3402 "in fragment shader");
3405 /* Make sure all gl_FragCoord redeclarations specify the same layout
3408 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3409 const char *const qual_string
=
3410 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3411 qual
->flags
.q
.pixel_center_integer
);
3413 const char *const state_string
=
3414 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3415 state
->fs_pixel_center_integer
);
3417 _mesa_glsl_error(loc
, state
,
3418 "gl_FragCoord redeclared with different layout "
3419 "qualifiers (%s) and (%s) ",
3423 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3424 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3425 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3426 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3427 state
->fs_redeclares_gl_fragcoord
=
3428 state
->fs_origin_upper_left
||
3429 state
->fs_pixel_center_integer
||
3430 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3433 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3434 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3435 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3436 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3437 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3438 ? "origin_upper_left" : "pixel_center_integer";
3440 _mesa_glsl_error(loc
, state
,
3441 "layout qualifier `%s' can only be applied to "
3442 "fragment shader input `gl_FragCoord'",
3446 if (qual
->flags
.q
.explicit_location
) {
3447 apply_explicit_location(qual
, var
, state
, loc
);
3449 if (qual
->flags
.q
.explicit_component
) {
3450 unsigned qual_component
;
3451 if (process_qualifier_constant(state
, loc
, "component",
3452 qual
->component
, &qual_component
)) {
3453 const glsl_type
*type
= var
->type
->without_array();
3454 unsigned components
= type
->component_slots();
3456 if (type
->is_matrix() || type
->is_record()) {
3457 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3458 "cannot be applied to a matrix, a structure, "
3459 "a block, or an array containing any of "
3461 } else if (qual_component
!= 0 &&
3462 (qual_component
+ components
- 1) > 3) {
3463 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3464 (qual_component
+ components
- 1));
3465 } else if (qual_component
== 1 && type
->is_64bit()) {
3466 /* We don't bother checking for 3 as it should be caught by the
3467 * overflow check above.
3469 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3470 "component 1 or 3");
3472 var
->data
.explicit_component
= true;
3473 var
->data
.location_frac
= qual_component
;
3477 } else if (qual
->flags
.q
.explicit_index
) {
3478 if (!qual
->flags
.q
.subroutine_def
)
3479 _mesa_glsl_error(loc
, state
,
3480 "explicit index requires explicit location");
3481 } else if (qual
->flags
.q
.explicit_component
) {
3482 _mesa_glsl_error(loc
, state
,
3483 "explicit component requires explicit location");
3486 if (qual
->flags
.q
.explicit_binding
) {
3487 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3490 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3491 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3492 unsigned qual_stream
;
3493 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3495 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3496 var
->data
.stream
= qual_stream
;
3500 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3501 unsigned qual_xfb_buffer
;
3502 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3503 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3504 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3505 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3506 if (qual
->flags
.q
.explicit_xfb_buffer
)
3507 var
->data
.explicit_xfb_buffer
= true;
3511 if (qual
->flags
.q
.explicit_xfb_offset
) {
3512 unsigned qual_xfb_offset
;
3513 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3515 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3516 qual
->offset
, &qual_xfb_offset
) &&
3517 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3518 var
->type
, component_size
)) {
3519 var
->data
.offset
= qual_xfb_offset
;
3520 var
->data
.explicit_xfb_offset
= true;
3524 if (qual
->flags
.q
.explicit_xfb_stride
) {
3525 unsigned qual_xfb_stride
;
3526 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3527 qual
->xfb_stride
, &qual_xfb_stride
)) {
3528 var
->data
.xfb_stride
= qual_xfb_stride
;
3529 var
->data
.explicit_xfb_stride
= true;
3533 if (var
->type
->contains_atomic()) {
3534 if (var
->data
.mode
== ir_var_uniform
) {
3535 if (var
->data
.explicit_binding
) {
3537 &state
->atomic_counter_offsets
[var
->data
.binding
];
3539 if (*offset
% ATOMIC_COUNTER_SIZE
)
3540 _mesa_glsl_error(loc
, state
,
3541 "misaligned atomic counter offset");
3543 var
->data
.offset
= *offset
;
3544 *offset
+= var
->type
->atomic_size();
3547 _mesa_glsl_error(loc
, state
,
3548 "atomic counters require explicit binding point");
3550 } else if (var
->data
.mode
!= ir_var_function_in
) {
3551 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3552 "function parameters or uniform-qualified "
3553 "global variables");
3557 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3558 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3559 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3560 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3561 * These extensions and all following extensions that add the 'layout'
3562 * keyword have been modified to require the use of 'in' or 'out'.
3564 * The following extension do not allow the deprecated keywords:
3566 * GL_AMD_conservative_depth
3567 * GL_ARB_conservative_depth
3568 * GL_ARB_gpu_shader5
3569 * GL_ARB_separate_shader_objects
3570 * GL_ARB_tessellation_shader
3571 * GL_ARB_transform_feedback3
3572 * GL_ARB_uniform_buffer_object
3574 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3575 * allow layout with the deprecated keywords.
3577 const bool relaxed_layout_qualifier_checking
=
3578 state
->ARB_fragment_coord_conventions_enable
;
3580 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3581 || qual
->flags
.q
.varying
;
3582 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3583 if (relaxed_layout_qualifier_checking
) {
3584 _mesa_glsl_warning(loc
, state
,
3585 "`layout' qualifier may not be used with "
3586 "`attribute' or `varying'");
3588 _mesa_glsl_error(loc
, state
,
3589 "`layout' qualifier may not be used with "
3590 "`attribute' or `varying'");
3594 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3595 * AMD_conservative_depth.
3597 int depth_layout_count
= qual
->flags
.q
.depth_any
3598 + qual
->flags
.q
.depth_greater
3599 + qual
->flags
.q
.depth_less
3600 + qual
->flags
.q
.depth_unchanged
;
3601 if (depth_layout_count
> 0
3602 && !state
->is_version(420, 0)
3603 && !state
->AMD_conservative_depth_enable
3604 && !state
->ARB_conservative_depth_enable
) {
3605 _mesa_glsl_error(loc
, state
,
3606 "extension GL_AMD_conservative_depth or "
3607 "GL_ARB_conservative_depth must be enabled "
3608 "to use depth layout qualifiers");
3609 } else if (depth_layout_count
> 0
3610 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3611 _mesa_glsl_error(loc
, state
,
3612 "depth layout qualifiers can be applied only to "
3614 } else if (depth_layout_count
> 1
3615 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3616 _mesa_glsl_error(loc
, state
,
3617 "at most one depth layout qualifier can be applied to "
3620 if (qual
->flags
.q
.depth_any
)
3621 var
->data
.depth_layout
= ir_depth_layout_any
;
3622 else if (qual
->flags
.q
.depth_greater
)
3623 var
->data
.depth_layout
= ir_depth_layout_greater
;
3624 else if (qual
->flags
.q
.depth_less
)
3625 var
->data
.depth_layout
= ir_depth_layout_less
;
3626 else if (qual
->flags
.q
.depth_unchanged
)
3627 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3629 var
->data
.depth_layout
= ir_depth_layout_none
;
3631 if (qual
->flags
.q
.std140
||
3632 qual
->flags
.q
.std430
||
3633 qual
->flags
.q
.packed
||
3634 qual
->flags
.q
.shared
) {
3635 _mesa_glsl_error(loc
, state
,
3636 "uniform and shader storage block layout qualifiers "
3637 "std140, std430, packed, and shared can only be "
3638 "applied to uniform or shader storage blocks, not "
3642 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3643 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3646 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3649 * "Fragment shaders also allow the following layout qualifier on in only
3650 * (not with variable declarations)
3651 * layout-qualifier-id
3652 * early_fragment_tests
3655 if (qual
->flags
.q
.early_fragment_tests
) {
3656 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3657 "valid in fragment shader input layout declaration.");
3660 if (qual
->flags
.q
.inner_coverage
) {
3661 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3662 "valid in fragment shader input layout declaration.");
3665 if (qual
->flags
.q
.post_depth_coverage
) {
3666 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3667 "valid in fragment shader input layout declaration.");
3672 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3674 struct _mesa_glsl_parse_state
*state
,
3678 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3680 if (qual
->flags
.q
.invariant
) {
3681 if (var
->data
.used
) {
3682 _mesa_glsl_error(loc
, state
,
3683 "variable `%s' may not be redeclared "
3684 "`invariant' after being used",
3687 var
->data
.invariant
= 1;
3691 if (qual
->flags
.q
.precise
) {
3692 if (var
->data
.used
) {
3693 _mesa_glsl_error(loc
, state
,
3694 "variable `%s' may not be redeclared "
3695 "`precise' after being used",
3698 var
->data
.precise
= 1;
3702 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3703 _mesa_glsl_error(loc
, state
,
3704 "`subroutine' may only be applied to uniforms, "
3705 "subroutine type declarations, or function definitions");
3708 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3709 || qual
->flags
.q
.uniform
3710 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3711 var
->data
.read_only
= 1;
3713 if (qual
->flags
.q
.centroid
)
3714 var
->data
.centroid
= 1;
3716 if (qual
->flags
.q
.sample
)
3717 var
->data
.sample
= 1;
3719 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3720 if (state
->es_shader
) {
3721 var
->data
.precision
=
3722 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3725 if (qual
->flags
.q
.patch
)
3726 var
->data
.patch
= 1;
3728 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3729 var
->type
= glsl_type::error_type
;
3730 _mesa_glsl_error(loc
, state
,
3731 "`attribute' variables may not be declared in the "
3733 _mesa_shader_stage_to_string(state
->stage
));
3736 /* Disallow layout qualifiers which may only appear on layout declarations. */
3737 if (qual
->flags
.q
.prim_type
) {
3738 _mesa_glsl_error(loc
, state
,
3739 "Primitive type may only be specified on GS input or output "
3740 "layout declaration, not on variables.");
3743 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3745 * "However, the const qualifier cannot be used with out or inout."
3747 * The same section of the GLSL 4.40 spec further clarifies this saying:
3749 * "The const qualifier cannot be used with out or inout, or a
3750 * compile-time error results."
3752 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3753 _mesa_glsl_error(loc
, state
,
3754 "`const' may not be applied to `out' or `inout' "
3755 "function parameters");
3758 /* If there is no qualifier that changes the mode of the variable, leave
3759 * the setting alone.
3761 assert(var
->data
.mode
!= ir_var_temporary
);
3762 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3763 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
3764 else if (qual
->flags
.q
.in
)
3765 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3766 else if (qual
->flags
.q
.attribute
3767 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3768 var
->data
.mode
= ir_var_shader_in
;
3769 else if (qual
->flags
.q
.out
)
3770 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3771 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3772 var
->data
.mode
= ir_var_shader_out
;
3773 else if (qual
->flags
.q
.uniform
)
3774 var
->data
.mode
= ir_var_uniform
;
3775 else if (qual
->flags
.q
.buffer
)
3776 var
->data
.mode
= ir_var_shader_storage
;
3777 else if (qual
->flags
.q
.shared_storage
)
3778 var
->data
.mode
= ir_var_shader_shared
;
3780 var
->data
.fb_fetch_output
= state
->stage
== MESA_SHADER_FRAGMENT
&&
3781 qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
3783 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3784 /* User-defined ins/outs are not permitted in compute shaders. */
3785 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3786 _mesa_glsl_error(loc
, state
,
3787 "user-defined input and output variables are not "
3788 "permitted in compute shaders");
3791 /* This variable is being used to link data between shader stages (in
3792 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3793 * that is allowed for such purposes.
3795 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3797 * "The varying qualifier can be used only with the data types
3798 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3801 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3802 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3804 * "Fragment inputs can only be signed and unsigned integers and
3805 * integer vectors, float, floating-point vectors, matrices, or
3806 * arrays of these. Structures cannot be input.
3808 * Similar text exists in the section on vertex shader outputs.
3810 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3811 * 3.00 spec allows structs as well. Varying structs are also allowed
3814 switch (var
->type
->get_scalar_type()->base_type
) {
3815 case GLSL_TYPE_FLOAT
:
3816 /* Ok in all GLSL versions */
3818 case GLSL_TYPE_UINT
:
3820 if (state
->is_version(130, 300))
3822 _mesa_glsl_error(loc
, state
,
3823 "varying variables must be of base type float in %s",
3824 state
->get_version_string());
3826 case GLSL_TYPE_STRUCT
:
3827 if (state
->is_version(150, 300))
3829 _mesa_glsl_error(loc
, state
,
3830 "varying variables may not be of type struct");
3832 case GLSL_TYPE_DOUBLE
:
3835 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3840 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3841 switch (state
->stage
) {
3842 case MESA_SHADER_VERTEX
:
3843 if (var
->data
.mode
== ir_var_shader_out
)
3844 var
->data
.invariant
= true;
3846 case MESA_SHADER_TESS_CTRL
:
3847 case MESA_SHADER_TESS_EVAL
:
3848 case MESA_SHADER_GEOMETRY
:
3849 if ((var
->data
.mode
== ir_var_shader_in
)
3850 || (var
->data
.mode
== ir_var_shader_out
))
3851 var
->data
.invariant
= true;
3853 case MESA_SHADER_FRAGMENT
:
3854 if (var
->data
.mode
== ir_var_shader_in
)
3855 var
->data
.invariant
= true;
3857 case MESA_SHADER_COMPUTE
:
3858 /* Invariance isn't meaningful in compute shaders. */
3863 var
->data
.interpolation
=
3864 interpret_interpolation_qualifier(qual
, var
->type
,
3865 (ir_variable_mode
) var
->data
.mode
,
3868 /* Does the declaration use the deprecated 'attribute' or 'varying'
3871 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3872 || qual
->flags
.q
.varying
;
3875 /* Validate auxiliary storage qualifiers */
3877 /* From section 4.3.4 of the GLSL 1.30 spec:
3878 * "It is an error to use centroid in in a vertex shader."
3880 * From section 4.3.4 of the GLSL ES 3.00 spec:
3881 * "It is an error to use centroid in or interpolation qualifiers in
3882 * a vertex shader input."
3885 /* Section 4.3.6 of the GLSL 1.30 specification states:
3886 * "It is an error to use centroid out in a fragment shader."
3888 * The GL_ARB_shading_language_420pack extension specification states:
3889 * "It is an error to use auxiliary storage qualifiers or interpolation
3890 * qualifiers on an output in a fragment shader."
3892 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3893 _mesa_glsl_error(loc
, state
,
3894 "sample qualifier may only be used on `in` or `out` "
3895 "variables between shader stages");
3897 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3898 _mesa_glsl_error(loc
, state
,
3899 "centroid qualifier may only be used with `in', "
3900 "`out' or `varying' variables between shader stages");
3903 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3904 _mesa_glsl_error(loc
, state
,
3905 "the shared storage qualifiers can only be used with "
3909 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3913 * Get the variable that is being redeclared by this declaration
3915 * Semantic checks to verify the validity of the redeclaration are also
3916 * performed. If semantic checks fail, compilation error will be emitted via
3917 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3920 * A pointer to an existing variable in the current scope if the declaration
3921 * is a redeclaration, \c NULL otherwise.
3923 static ir_variable
*
3924 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3925 struct _mesa_glsl_parse_state
*state
,
3926 bool allow_all_redeclarations
)
3928 /* Check if this declaration is actually a re-declaration, either to
3929 * resize an array or add qualifiers to an existing variable.
3931 * This is allowed for variables in the current scope, or when at
3932 * global scope (for built-ins in the implicit outer scope).
3934 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3935 if (earlier
== NULL
||
3936 (state
->current_function
!= NULL
&&
3937 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3942 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3944 * "It is legal to declare an array without a size and then
3945 * later re-declare the same name as an array of the same
3946 * type and specify a size."
3948 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3949 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3950 /* FINISHME: This doesn't match the qualifiers on the two
3951 * FINISHME: declarations. It's not 100% clear whether this is
3952 * FINISHME: required or not.
3955 const int size
= var
->type
->array_size();
3956 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3957 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3958 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3960 earlier
->data
.max_array_access
);
3963 earlier
->type
= var
->type
;
3966 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3967 state
->is_version(150, 0))
3968 && strcmp(var
->name
, "gl_FragCoord") == 0
3969 && earlier
->type
== var
->type
3970 && var
->data
.mode
== ir_var_shader_in
) {
3971 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3974 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3975 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3977 /* According to section 4.3.7 of the GLSL 1.30 spec,
3978 * the following built-in varaibles can be redeclared with an
3979 * interpolation qualifier:
3982 * * gl_FrontSecondaryColor
3983 * * gl_BackSecondaryColor
3985 * * gl_SecondaryColor
3987 } else if (state
->is_version(130, 0)
3988 && (strcmp(var
->name
, "gl_FrontColor") == 0
3989 || strcmp(var
->name
, "gl_BackColor") == 0
3990 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3991 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3992 || strcmp(var
->name
, "gl_Color") == 0
3993 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3994 && earlier
->type
== var
->type
3995 && earlier
->data
.mode
== var
->data
.mode
) {
3996 earlier
->data
.interpolation
= var
->data
.interpolation
;
3998 /* Layout qualifiers for gl_FragDepth. */
3999 } else if ((state
->is_version(420, 0) ||
4000 state
->AMD_conservative_depth_enable
||
4001 state
->ARB_conservative_depth_enable
)
4002 && strcmp(var
->name
, "gl_FragDepth") == 0
4003 && earlier
->type
== var
->type
4004 && earlier
->data
.mode
== var
->data
.mode
) {
4006 /** From the AMD_conservative_depth spec:
4007 * Within any shader, the first redeclarations of gl_FragDepth
4008 * must appear before any use of gl_FragDepth.
4010 if (earlier
->data
.used
) {
4011 _mesa_glsl_error(&loc
, state
,
4012 "the first redeclaration of gl_FragDepth "
4013 "must appear before any use of gl_FragDepth");
4016 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4017 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4018 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4019 _mesa_glsl_error(&loc
, state
,
4020 "gl_FragDepth: depth layout is declared here "
4021 "as '%s, but it was previously declared as "
4023 depth_layout_string(var
->data
.depth_layout
),
4024 depth_layout_string(earlier
->data
.depth_layout
));
4027 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4029 } else if (state
->has_framebuffer_fetch() &&
4030 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4031 var
->type
== earlier
->type
&&
4032 var
->data
.mode
== ir_var_auto
) {
4033 /* According to the EXT_shader_framebuffer_fetch spec:
4035 * "By default, gl_LastFragData is declared with the mediump precision
4036 * qualifier. This can be changed by redeclaring the corresponding
4037 * variables with the desired precision qualifier."
4039 earlier
->data
.precision
= var
->data
.precision
;
4041 } else if (allow_all_redeclarations
) {
4042 if (earlier
->data
.mode
!= var
->data
.mode
) {
4043 _mesa_glsl_error(&loc
, state
,
4044 "redeclaration of `%s' with incorrect qualifiers",
4046 } else if (earlier
->type
!= var
->type
) {
4047 _mesa_glsl_error(&loc
, state
,
4048 "redeclaration of `%s' has incorrect type",
4052 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4059 * Generate the IR for an initializer in a variable declaration
4062 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4063 ast_fully_specified_type
*type
,
4064 exec_list
*initializer_instructions
,
4065 struct _mesa_glsl_parse_state
*state
)
4067 ir_rvalue
*result
= NULL
;
4069 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4071 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4073 * "All uniform variables are read-only and are initialized either
4074 * directly by an application via API commands, or indirectly by
4077 if (var
->data
.mode
== ir_var_uniform
) {
4078 state
->check_version(120, 0, &initializer_loc
,
4079 "cannot initialize uniform %s",
4083 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4085 * "Buffer variables cannot have initializers."
4087 if (var
->data
.mode
== ir_var_shader_storage
) {
4088 _mesa_glsl_error(&initializer_loc
, state
,
4089 "cannot initialize buffer variable %s",
4093 /* From section 4.1.7 of the GLSL 4.40 spec:
4095 * "Opaque variables [...] are initialized only through the
4096 * OpenGL API; they cannot be declared with an initializer in a
4099 if (var
->type
->contains_opaque()) {
4100 _mesa_glsl_error(&initializer_loc
, state
,
4101 "cannot initialize opaque variable %s",
4105 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4106 _mesa_glsl_error(&initializer_loc
, state
,
4107 "cannot initialize %s shader input / %s %s",
4108 _mesa_shader_stage_to_string(state
->stage
),
4109 (state
->stage
== MESA_SHADER_VERTEX
)
4110 ? "attribute" : "varying",
4114 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4115 _mesa_glsl_error(&initializer_loc
, state
,
4116 "cannot initialize %s shader output %s",
4117 _mesa_shader_stage_to_string(state
->stage
),
4121 /* If the initializer is an ast_aggregate_initializer, recursively store
4122 * type information from the LHS into it, so that its hir() function can do
4125 if (decl
->initializer
->oper
== ast_aggregate
)
4126 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4128 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4129 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4131 /* Calculate the constant value if this is a const or uniform
4134 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4136 * "Declarations of globals without a storage qualifier, or with
4137 * just the const qualifier, may include initializers, in which case
4138 * they will be initialized before the first line of main() is
4139 * executed. Such initializers must be a constant expression."
4141 * The same section of the GLSL ES 3.00.4 spec has similar language.
4143 if (type
->qualifier
.flags
.q
.constant
4144 || type
->qualifier
.flags
.q
.uniform
4145 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4146 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4148 if (new_rhs
!= NULL
) {
4151 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4154 * "A constant expression is one of
4158 * - an expression formed by an operator on operands that are
4159 * all constant expressions, including getting an element of
4160 * a constant array, or a field of a constant structure, or
4161 * components of a constant vector. However, the sequence
4162 * operator ( , ) and the assignment operators ( =, +=, ...)
4163 * are not included in the operators that can create a
4164 * constant expression."
4166 * Section 12.43 (Sequence operator and constant expressions) says:
4168 * "Should the following construct be allowed?
4172 * The expression within the brackets uses the sequence operator
4173 * (',') and returns the integer 3 so the construct is declaring
4174 * a single-dimensional array of size 3. In some languages, the
4175 * construct declares a two-dimensional array. It would be
4176 * preferable to make this construct illegal to avoid confusion.
4178 * One possibility is to change the definition of the sequence
4179 * operator so that it does not return a constant-expression and
4180 * hence cannot be used to declare an array size.
4182 * RESOLUTION: The result of a sequence operator is not a
4183 * constant-expression."
4185 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4186 * contains language almost identical to the section 4.3.3 in the
4187 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4190 ir_constant
*constant_value
= rhs
->constant_expression_value();
4191 if (!constant_value
||
4192 (state
->is_version(430, 300) &&
4193 decl
->initializer
->has_sequence_subexpression())) {
4194 const char *const variable_mode
=
4195 (type
->qualifier
.flags
.q
.constant
)
4197 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4199 /* If ARB_shading_language_420pack is enabled, initializers of
4200 * const-qualified local variables do not have to be constant
4201 * expressions. Const-qualified global variables must still be
4202 * initialized with constant expressions.
4204 if (!state
->has_420pack()
4205 || state
->current_function
== NULL
) {
4206 _mesa_glsl_error(& initializer_loc
, state
,
4207 "initializer of %s variable `%s' must be a "
4208 "constant expression",
4211 if (var
->type
->is_numeric()) {
4212 /* Reduce cascading errors. */
4213 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4214 ? ir_constant::zero(state
, var
->type
) : NULL
;
4218 rhs
= constant_value
;
4219 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4220 ? constant_value
: NULL
;
4223 if (var
->type
->is_numeric()) {
4224 /* Reduce cascading errors. */
4225 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4226 ? ir_constant::zero(state
, var
->type
) : NULL
;
4231 if (rhs
&& !rhs
->type
->is_error()) {
4232 bool temp
= var
->data
.read_only
;
4233 if (type
->qualifier
.flags
.q
.constant
)
4234 var
->data
.read_only
= false;
4236 /* Never emit code to initialize a uniform.
4238 const glsl_type
*initializer_type
;
4239 if (!type
->qualifier
.flags
.q
.uniform
) {
4240 do_assignment(initializer_instructions
, state
,
4245 type
->get_location());
4246 initializer_type
= result
->type
;
4248 initializer_type
= rhs
->type
;
4250 var
->constant_initializer
= rhs
->constant_expression_value();
4251 var
->data
.has_initializer
= true;
4253 /* If the declared variable is an unsized array, it must inherrit
4254 * its full type from the initializer. A declaration such as
4256 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4260 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4262 * The assignment generated in the if-statement (below) will also
4263 * automatically handle this case for non-uniforms.
4265 * If the declared variable is not an array, the types must
4266 * already match exactly. As a result, the type assignment
4267 * here can be done unconditionally. For non-uniforms the call
4268 * to do_assignment can change the type of the initializer (via
4269 * the implicit conversion rules). For uniforms the initializer
4270 * must be a constant expression, and the type of that expression
4271 * was validated above.
4273 var
->type
= initializer_type
;
4275 var
->data
.read_only
= temp
;
4282 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4283 YYLTYPE loc
, ir_variable
*var
,
4284 unsigned num_vertices
,
4286 const char *var_category
)
4288 if (var
->type
->is_unsized_array()) {
4289 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4291 * All geometry shader input unsized array declarations will be
4292 * sized by an earlier input layout qualifier, when present, as per
4293 * the following table.
4295 * Followed by a table mapping each allowed input layout qualifier to
4296 * the corresponding input length.
4298 * Similarly for tessellation control shader outputs.
4300 if (num_vertices
!= 0)
4301 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4304 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4305 * includes the following examples of compile-time errors:
4307 * // code sequence within one shader...
4308 * in vec4 Color1[]; // size unknown
4309 * ...Color1.length()...// illegal, length() unknown
4310 * in vec4 Color2[2]; // size is 2
4311 * ...Color1.length()...// illegal, Color1 still has no size
4312 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4313 * layout(lines) in; // legal, input size is 2, matching
4314 * in vec4 Color4[3]; // illegal, contradicts layout
4317 * To detect the case illustrated by Color3, we verify that the size of
4318 * an explicitly-sized array matches the size of any previously declared
4319 * explicitly-sized array. To detect the case illustrated by Color4, we
4320 * verify that the size of an explicitly-sized array is consistent with
4321 * any previously declared input layout.
4323 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4324 _mesa_glsl_error(&loc
, state
,
4325 "%s size contradicts previously declared layout "
4326 "(size is %u, but layout requires a size of %u)",
4327 var_category
, var
->type
->length
, num_vertices
);
4328 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4329 _mesa_glsl_error(&loc
, state
,
4330 "%s sizes are inconsistent (size is %u, but a "
4331 "previous declaration has size %u)",
4332 var_category
, var
->type
->length
, *size
);
4334 *size
= var
->type
->length
;
4340 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4341 YYLTYPE loc
, ir_variable
*var
)
4343 unsigned num_vertices
= 0;
4345 if (state
->tcs_output_vertices_specified
) {
4346 if (!state
->out_qualifier
->vertices
->
4347 process_qualifier_constant(state
, "vertices",
4348 &num_vertices
, false)) {
4352 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4353 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4354 "GL_MAX_PATCH_VERTICES", num_vertices
);
4359 if (!var
->type
->is_array() && !var
->data
.patch
) {
4360 _mesa_glsl_error(&loc
, state
,
4361 "tessellation control shader outputs must be arrays");
4363 /* To avoid cascading failures, short circuit the checks below. */
4367 if (var
->data
.patch
)
4370 var
->data
.tess_varying_implicit_sized_array
= var
->type
->is_unsized_array();
4372 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4373 &state
->tcs_output_size
,
4374 "tessellation control shader output");
4378 * Do additional processing necessary for tessellation control/evaluation shader
4379 * input declarations. This covers both interface block arrays and bare input
4383 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4384 YYLTYPE loc
, ir_variable
*var
)
4386 if (!var
->type
->is_array() && !var
->data
.patch
) {
4387 _mesa_glsl_error(&loc
, state
,
4388 "per-vertex tessellation shader inputs must be arrays");
4389 /* Avoid cascading failures. */
4393 if (var
->data
.patch
)
4396 /* The ARB_tessellation_shader spec says:
4398 * "Declaring an array size is optional. If no size is specified, it
4399 * will be taken from the implementation-dependent maximum patch size
4400 * (gl_MaxPatchVertices). If a size is specified, it must match the
4401 * maximum patch size; otherwise, a compile or link error will occur."
4403 * This text appears twice, once for TCS inputs, and again for TES inputs.
4405 if (var
->type
->is_unsized_array()) {
4406 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4407 state
->Const
.MaxPatchVertices
);
4408 var
->data
.tess_varying_implicit_sized_array
= true;
4409 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4410 _mesa_glsl_error(&loc
, state
,
4411 "per-vertex tessellation shader input arrays must be "
4412 "sized to gl_MaxPatchVertices (%d).",
4413 state
->Const
.MaxPatchVertices
);
4419 * Do additional processing necessary for geometry shader input declarations
4420 * (this covers both interface blocks arrays and bare input variables).
4423 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4424 YYLTYPE loc
, ir_variable
*var
)
4426 unsigned num_vertices
= 0;
4428 if (state
->gs_input_prim_type_specified
) {
4429 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4432 /* Geometry shader input variables must be arrays. Caller should have
4433 * reported an error for this.
4435 if (!var
->type
->is_array()) {
4436 assert(state
->error
);
4438 /* To avoid cascading failures, short circuit the checks below. */
4442 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4443 &state
->gs_input_size
,
4444 "geometry shader input");
4448 validate_identifier(const char *identifier
, YYLTYPE loc
,
4449 struct _mesa_glsl_parse_state
*state
)
4451 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4453 * "Identifiers starting with "gl_" are reserved for use by
4454 * OpenGL, and may not be declared in a shader as either a
4455 * variable or a function."
4457 if (is_gl_identifier(identifier
)) {
4458 _mesa_glsl_error(&loc
, state
,
4459 "identifier `%s' uses reserved `gl_' prefix",
4461 } else if (strstr(identifier
, "__")) {
4462 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4465 * "In addition, all identifiers containing two
4466 * consecutive underscores (__) are reserved as
4467 * possible future keywords."
4469 * The intention is that names containing __ are reserved for internal
4470 * use by the implementation, and names prefixed with GL_ are reserved
4471 * for use by Khronos. Names simply containing __ are dangerous to use,
4472 * but should be allowed.
4474 * A future version of the GLSL specification will clarify this.
4476 _mesa_glsl_warning(&loc
, state
,
4477 "identifier `%s' uses reserved `__' string",
4483 ast_declarator_list::hir(exec_list
*instructions
,
4484 struct _mesa_glsl_parse_state
*state
)
4487 const struct glsl_type
*decl_type
;
4488 const char *type_name
= NULL
;
4489 ir_rvalue
*result
= NULL
;
4490 YYLTYPE loc
= this->get_location();
4492 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4494 * "To ensure that a particular output variable is invariant, it is
4495 * necessary to use the invariant qualifier. It can either be used to
4496 * qualify a previously declared variable as being invariant
4498 * invariant gl_Position; // make existing gl_Position be invariant"
4500 * In these cases the parser will set the 'invariant' flag in the declarator
4501 * list, and the type will be NULL.
4503 if (this->invariant
) {
4504 assert(this->type
== NULL
);
4506 if (state
->current_function
!= NULL
) {
4507 _mesa_glsl_error(& loc
, state
,
4508 "all uses of `invariant' keyword must be at global "
4512 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4513 assert(decl
->array_specifier
== NULL
);
4514 assert(decl
->initializer
== NULL
);
4516 ir_variable
*const earlier
=
4517 state
->symbols
->get_variable(decl
->identifier
);
4518 if (earlier
== NULL
) {
4519 _mesa_glsl_error(& loc
, state
,
4520 "undeclared variable `%s' cannot be marked "
4521 "invariant", decl
->identifier
);
4522 } else if (!is_allowed_invariant(earlier
, state
)) {
4523 _mesa_glsl_error(&loc
, state
,
4524 "`%s' cannot be marked invariant; interfaces between "
4525 "shader stages only.", decl
->identifier
);
4526 } else if (earlier
->data
.used
) {
4527 _mesa_glsl_error(& loc
, state
,
4528 "variable `%s' may not be redeclared "
4529 "`invariant' after being used",
4532 earlier
->data
.invariant
= true;
4536 /* Invariant redeclarations do not have r-values.
4541 if (this->precise
) {
4542 assert(this->type
== NULL
);
4544 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4545 assert(decl
->array_specifier
== NULL
);
4546 assert(decl
->initializer
== NULL
);
4548 ir_variable
*const earlier
=
4549 state
->symbols
->get_variable(decl
->identifier
);
4550 if (earlier
== NULL
) {
4551 _mesa_glsl_error(& loc
, state
,
4552 "undeclared variable `%s' cannot be marked "
4553 "precise", decl
->identifier
);
4554 } else if (state
->current_function
!= NULL
&&
4555 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4556 /* Note: we have to check if we're in a function, since
4557 * builtins are treated as having come from another scope.
4559 _mesa_glsl_error(& loc
, state
,
4560 "variable `%s' from an outer scope may not be "
4561 "redeclared `precise' in this scope",
4563 } else if (earlier
->data
.used
) {
4564 _mesa_glsl_error(& loc
, state
,
4565 "variable `%s' may not be redeclared "
4566 "`precise' after being used",
4569 earlier
->data
.precise
= true;
4573 /* Precise redeclarations do not have r-values either. */
4577 assert(this->type
!= NULL
);
4578 assert(!this->invariant
);
4579 assert(!this->precise
);
4581 /* The type specifier may contain a structure definition. Process that
4582 * before any of the variable declarations.
4584 (void) this->type
->specifier
->hir(instructions
, state
);
4586 decl_type
= this->type
->glsl_type(& type_name
, state
);
4588 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4589 * "Buffer variables may only be declared inside interface blocks
4590 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4591 * shader storage blocks. It is a compile-time error to declare buffer
4592 * variables at global scope (outside a block)."
4594 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4595 _mesa_glsl_error(&loc
, state
,
4596 "buffer variables cannot be declared outside "
4597 "interface blocks");
4600 /* An offset-qualified atomic counter declaration sets the default
4601 * offset for the next declaration within the same atomic counter
4604 if (decl_type
&& decl_type
->contains_atomic()) {
4605 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4606 type
->qualifier
.flags
.q
.explicit_offset
) {
4607 unsigned qual_binding
;
4608 unsigned qual_offset
;
4609 if (process_qualifier_constant(state
, &loc
, "binding",
4610 type
->qualifier
.binding
,
4612 && process_qualifier_constant(state
, &loc
, "offset",
4613 type
->qualifier
.offset
,
4615 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4619 ast_type_qualifier allowed_atomic_qual_mask
;
4620 allowed_atomic_qual_mask
.flags
.i
= 0;
4621 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4622 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4623 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4625 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4626 "invalid layout qualifier for",
4630 if (this->declarations
.is_empty()) {
4631 /* If there is no structure involved in the program text, there are two
4632 * possible scenarios:
4634 * - The program text contained something like 'vec4;'. This is an
4635 * empty declaration. It is valid but weird. Emit a warning.
4637 * - The program text contained something like 'S;' and 'S' is not the
4638 * name of a known structure type. This is both invalid and weird.
4641 * - The program text contained something like 'mediump float;'
4642 * when the programmer probably meant 'precision mediump
4643 * float;' Emit a warning with a description of what they
4644 * probably meant to do.
4646 * Note that if decl_type is NULL and there is a structure involved,
4647 * there must have been some sort of error with the structure. In this
4648 * case we assume that an error was already generated on this line of
4649 * code for the structure. There is no need to generate an additional,
4652 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4655 if (decl_type
== NULL
) {
4656 _mesa_glsl_error(&loc
, state
,
4657 "invalid type `%s' in empty declaration",
4660 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4661 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4664 * "... any declaration that leaves the size undefined is
4665 * disallowed as this would add complexity and there are no
4668 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4669 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4670 "or implicitly defined");
4673 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4675 * "The combinations of types and qualifiers that cause
4676 * compile-time or link-time errors are the same whether or not
4677 * the declaration is empty."
4679 validate_array_dimensions(decl_type
, state
, &loc
);
4682 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4683 /* Empty atomic counter declarations are allowed and useful
4684 * to set the default offset qualifier.
4687 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4688 if (this->type
->specifier
->structure
!= NULL
) {
4689 _mesa_glsl_error(&loc
, state
,
4690 "precision qualifiers can't be applied "
4693 static const char *const precision_names
[] = {
4700 _mesa_glsl_warning(&loc
, state
,
4701 "empty declaration with precision "
4702 "qualifier, to set the default precision, "
4703 "use `precision %s %s;'",
4704 precision_names
[this->type
->
4705 qualifier
.precision
],
4708 } else if (this->type
->specifier
->structure
== NULL
) {
4709 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4714 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4715 const struct glsl_type
*var_type
;
4717 const char *identifier
= decl
->identifier
;
4718 /* FINISHME: Emit a warning if a variable declaration shadows a
4719 * FINISHME: declaration at a higher scope.
4722 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4723 if (type_name
!= NULL
) {
4724 _mesa_glsl_error(& loc
, state
,
4725 "invalid type `%s' in declaration of `%s'",
4726 type_name
, decl
->identifier
);
4728 _mesa_glsl_error(& loc
, state
,
4729 "invalid type in declaration of `%s'",
4735 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4739 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4741 _mesa_glsl_error(& loc
, state
,
4742 "invalid type in declaration of `%s'",
4744 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4749 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4752 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4754 /* The 'varying in' and 'varying out' qualifiers can only be used with
4755 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4758 if (this->type
->qualifier
.flags
.q
.varying
) {
4759 if (this->type
->qualifier
.flags
.q
.in
) {
4760 _mesa_glsl_error(& loc
, state
,
4761 "`varying in' qualifier in declaration of "
4762 "`%s' only valid for geometry shaders using "
4763 "ARB_geometry_shader4 or EXT_geometry_shader4",
4765 } else if (this->type
->qualifier
.flags
.q
.out
) {
4766 _mesa_glsl_error(& loc
, state
,
4767 "`varying out' qualifier in declaration of "
4768 "`%s' only valid for geometry shaders using "
4769 "ARB_geometry_shader4 or EXT_geometry_shader4",
4774 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4776 * "Global variables can only use the qualifiers const,
4777 * attribute, uniform, or varying. Only one may be
4780 * Local variables can only use the qualifier const."
4782 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4783 * any extension that adds the 'layout' keyword.
4785 if (!state
->is_version(130, 300)
4786 && !state
->has_explicit_attrib_location()
4787 && !state
->has_separate_shader_objects()
4788 && !state
->ARB_fragment_coord_conventions_enable
) {
4789 if (this->type
->qualifier
.flags
.q
.out
) {
4790 _mesa_glsl_error(& loc
, state
,
4791 "`out' qualifier in declaration of `%s' "
4792 "only valid for function parameters in %s",
4793 decl
->identifier
, state
->get_version_string());
4795 if (this->type
->qualifier
.flags
.q
.in
) {
4796 _mesa_glsl_error(& loc
, state
,
4797 "`in' qualifier in declaration of `%s' "
4798 "only valid for function parameters in %s",
4799 decl
->identifier
, state
->get_version_string());
4801 /* FINISHME: Test for other invalid qualifiers. */
4804 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4806 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4809 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
4810 && (var
->type
->is_numeric() || var
->type
->is_boolean())
4811 && state
->zero_init
) {
4812 const ir_constant_data data
= {0};
4813 var
->data
.has_initializer
= true;
4814 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
4817 if (this->type
->qualifier
.flags
.q
.invariant
) {
4818 if (!is_allowed_invariant(var
, state
)) {
4819 _mesa_glsl_error(&loc
, state
,
4820 "`%s' cannot be marked invariant; interfaces between "
4821 "shader stages only", var
->name
);
4825 if (state
->current_function
!= NULL
) {
4826 const char *mode
= NULL
;
4827 const char *extra
= "";
4829 /* There is no need to check for 'inout' here because the parser will
4830 * only allow that in function parameter lists.
4832 if (this->type
->qualifier
.flags
.q
.attribute
) {
4834 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4835 mode
= "subroutine uniform";
4836 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4838 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4840 } else if (this->type
->qualifier
.flags
.q
.in
) {
4842 extra
= " or in function parameter list";
4843 } else if (this->type
->qualifier
.flags
.q
.out
) {
4845 extra
= " or in function parameter list";
4849 _mesa_glsl_error(& loc
, state
,
4850 "%s variable `%s' must be declared at "
4852 mode
, var
->name
, extra
);
4854 } else if (var
->data
.mode
== ir_var_shader_in
) {
4855 var
->data
.read_only
= true;
4857 if (state
->stage
== MESA_SHADER_VERTEX
) {
4858 bool error_emitted
= false;
4860 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4862 * "Vertex shader inputs can only be float, floating-point
4863 * vectors, matrices, signed and unsigned integers and integer
4864 * vectors. Vertex shader inputs can also form arrays of these
4865 * types, but not structures."
4867 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4869 * "Vertex shader inputs can only be float, floating-point
4870 * vectors, matrices, signed and unsigned integers and integer
4871 * vectors. They cannot be arrays or structures."
4873 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4875 * "The attribute qualifier can be used only with float,
4876 * floating-point vectors, and matrices. Attribute variables
4877 * cannot be declared as arrays or structures."
4879 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4881 * "Vertex shader inputs can only be float, floating-point
4882 * vectors, matrices, signed and unsigned integers and integer
4883 * vectors. Vertex shader inputs cannot be arrays or
4886 const glsl_type
*check_type
= var
->type
->without_array();
4888 switch (check_type
->base_type
) {
4889 case GLSL_TYPE_FLOAT
:
4891 case GLSL_TYPE_UINT
:
4893 if (state
->is_version(120, 300))
4895 case GLSL_TYPE_DOUBLE
:
4896 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4900 _mesa_glsl_error(& loc
, state
,
4901 "vertex shader input / attribute cannot have "
4903 var
->type
->is_array() ? "array of " : "",
4905 error_emitted
= true;
4908 if (!error_emitted
&& var
->type
->is_array() &&
4909 !state
->check_version(150, 0, &loc
,
4910 "vertex shader input / attribute "
4911 "cannot have array type")) {
4912 error_emitted
= true;
4914 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4915 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4917 * Geometry shader input variables get the per-vertex values
4918 * written out by vertex shader output variables of the same
4919 * names. Since a geometry shader operates on a set of
4920 * vertices, each input varying variable (or input block, see
4921 * interface blocks below) needs to be declared as an array.
4923 if (!var
->type
->is_array()) {
4924 _mesa_glsl_error(&loc
, state
,
4925 "geometry shader inputs must be arrays");
4928 handle_geometry_shader_input_decl(state
, loc
, var
);
4929 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4930 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4932 * It is a compile-time error to declare a fragment shader
4933 * input with, or that contains, any of the following types:
4937 * * An array of arrays
4938 * * An array of structures
4939 * * A structure containing an array
4940 * * A structure containing a structure
4942 if (state
->es_shader
) {
4943 const glsl_type
*check_type
= var
->type
->without_array();
4944 if (check_type
->is_boolean() ||
4945 check_type
->contains_opaque()) {
4946 _mesa_glsl_error(&loc
, state
,
4947 "fragment shader input cannot have type %s",
4950 if (var
->type
->is_array() &&
4951 var
->type
->fields
.array
->is_array()) {
4952 _mesa_glsl_error(&loc
, state
,
4954 "cannot have an array of arrays",
4955 _mesa_shader_stage_to_string(state
->stage
));
4957 if (var
->type
->is_array() &&
4958 var
->type
->fields
.array
->is_record()) {
4959 _mesa_glsl_error(&loc
, state
,
4960 "fragment shader input "
4961 "cannot have an array of structs");
4963 if (var
->type
->is_record()) {
4964 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4965 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4966 var
->type
->fields
.structure
[i
].type
->is_record())
4967 _mesa_glsl_error(&loc
, state
,
4968 "fragement shader input cannot have "
4969 "a struct that contains an "
4974 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4975 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4976 handle_tess_shader_input_decl(state
, loc
, var
);
4978 } else if (var
->data
.mode
== ir_var_shader_out
) {
4979 const glsl_type
*check_type
= var
->type
->without_array();
4981 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4983 * It is a compile-time error to declare a vertex, tessellation
4984 * evaluation, tessellation control, or geometry shader output
4985 * that contains any of the following:
4987 * * A Boolean type (bool, bvec2 ...)
4990 if (check_type
->is_boolean() || check_type
->contains_opaque())
4991 _mesa_glsl_error(&loc
, state
,
4992 "%s shader output cannot have type %s",
4993 _mesa_shader_stage_to_string(state
->stage
),
4996 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4998 * It is a compile-time error to declare a fragment shader output
4999 * that contains any of the following:
5001 * * A Boolean type (bool, bvec2 ...)
5002 * * A double-precision scalar or vector (double, dvec2 ...)
5007 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5008 if (check_type
->is_record() || check_type
->is_matrix())
5009 _mesa_glsl_error(&loc
, state
,
5010 "fragment shader output "
5011 "cannot have struct or matrix type");
5012 switch (check_type
->base_type
) {
5013 case GLSL_TYPE_UINT
:
5015 case GLSL_TYPE_FLOAT
:
5018 _mesa_glsl_error(&loc
, state
,
5019 "fragment shader output cannot have "
5020 "type %s", check_type
->name
);
5024 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5026 * It is a compile-time error to declare a vertex shader output
5027 * with, or that contains, any of the following types:
5031 * * An array of arrays
5032 * * An array of structures
5033 * * A structure containing an array
5034 * * A structure containing a structure
5036 * It is a compile-time error to declare a fragment shader output
5037 * with, or that contains, any of the following types:
5043 * * An array of array
5045 * ES 3.20 updates this to apply to tessellation and geometry shaders
5046 * as well. Because there are per-vertex arrays in the new stages,
5047 * it strikes the "array of..." rules and replaces them with these:
5049 * * For per-vertex-arrayed variables (applies to tessellation
5050 * control, tessellation evaluation and geometry shaders):
5052 * * Per-vertex-arrayed arrays of arrays
5053 * * Per-vertex-arrayed arrays of structures
5055 * * For non-per-vertex-arrayed variables:
5057 * * An array of arrays
5058 * * An array of structures
5060 * which basically says to unwrap the per-vertex aspect and apply
5063 if (state
->es_shader
) {
5064 if (var
->type
->is_array() &&
5065 var
->type
->fields
.array
->is_array()) {
5066 _mesa_glsl_error(&loc
, state
,
5068 "cannot have an array of arrays",
5069 _mesa_shader_stage_to_string(state
->stage
));
5071 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5072 const glsl_type
*type
= var
->type
;
5074 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5075 !var
->data
.patch
&& var
->type
->is_array()) {
5076 type
= var
->type
->fields
.array
;
5079 if (type
->is_array() && type
->fields
.array
->is_record()) {
5080 _mesa_glsl_error(&loc
, state
,
5081 "%s shader output cannot have "
5082 "an array of structs",
5083 _mesa_shader_stage_to_string(state
->stage
));
5085 if (type
->is_record()) {
5086 for (unsigned i
= 0; i
< type
->length
; i
++) {
5087 if (type
->fields
.structure
[i
].type
->is_array() ||
5088 type
->fields
.structure
[i
].type
->is_record())
5089 _mesa_glsl_error(&loc
, state
,
5090 "%s shader output cannot have a "
5091 "struct that contains an "
5093 _mesa_shader_stage_to_string(state
->stage
));
5099 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5100 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5102 } else if (var
->type
->contains_subroutine()) {
5103 /* declare subroutine uniforms as hidden */
5104 var
->data
.how_declared
= ir_var_hidden
;
5107 /* From section 4.3.4 of the GLSL 4.00 spec:
5108 * "Input variables may not be declared using the patch in qualifier
5109 * in tessellation control or geometry shaders."
5111 * From section 4.3.6 of the GLSL 4.00 spec:
5112 * "It is an error to use patch out in a vertex, tessellation
5113 * evaluation, or geometry shader."
5115 * This doesn't explicitly forbid using them in a fragment shader, but
5116 * that's probably just an oversight.
5118 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5119 && this->type
->qualifier
.flags
.q
.patch
5120 && this->type
->qualifier
.flags
.q
.in
) {
5122 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5123 "tessellation evaluation shader");
5126 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5127 && this->type
->qualifier
.flags
.q
.patch
5128 && this->type
->qualifier
.flags
.q
.out
) {
5130 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5131 "tessellation control shader");
5134 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5136 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5137 state
->check_precision_qualifiers_allowed(&loc
);
5140 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5141 !precision_qualifier_allowed(var
->type
)) {
5142 _mesa_glsl_error(&loc
, state
,
5143 "precision qualifiers apply only to floating point"
5144 ", integer and opaque types");
5147 /* From section 4.1.7 of the GLSL 4.40 spec:
5149 * "[Opaque types] can only be declared as function
5150 * parameters or uniform-qualified variables."
5152 if (var_type
->contains_opaque() &&
5153 !this->type
->qualifier
.flags
.q
.uniform
) {
5154 _mesa_glsl_error(&loc
, state
,
5155 "opaque variables must be declared uniform");
5158 /* Process the initializer and add its instructions to a temporary
5159 * list. This list will be added to the instruction stream (below) after
5160 * the declaration is added. This is done because in some cases (such as
5161 * redeclarations) the declaration may not actually be added to the
5162 * instruction stream.
5164 exec_list initializer_instructions
;
5166 /* Examine var name here since var may get deleted in the next call */
5167 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5169 ir_variable
*earlier
=
5170 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5171 false /* allow_all_redeclarations */);
5172 if (earlier
!= NULL
) {
5174 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
5175 _mesa_glsl_error(&loc
, state
,
5176 "`%s' has already been redeclared using "
5177 "gl_PerVertex", earlier
->name
);
5179 earlier
->data
.how_declared
= ir_var_declared_normally
;
5182 if (decl
->initializer
!= NULL
) {
5183 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
5185 &initializer_instructions
, state
);
5187 validate_array_dimensions(var_type
, state
, &loc
);
5190 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5192 * "It is an error to write to a const variable outside of
5193 * its declaration, so they must be initialized when
5196 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5197 _mesa_glsl_error(& loc
, state
,
5198 "const declaration of `%s' must be initialized",
5202 if (state
->es_shader
) {
5203 const glsl_type
*const t
= (earlier
== NULL
)
5204 ? var
->type
: earlier
->type
;
5206 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5208 * The GL_OES_tessellation_shader spec says about inputs:
5210 * "Declaring an array size is optional. If no size is specified,
5211 * it will be taken from the implementation-dependent maximum
5212 * patch size (gl_MaxPatchVertices)."
5214 * and about TCS outputs:
5216 * "If no size is specified, it will be taken from output patch
5217 * size declared in the shader."
5219 * The GL_OES_geometry_shader spec says:
5221 * "All geometry shader input unsized array declarations will be
5222 * sized by an earlier input primitive layout qualifier, when
5223 * present, as per the following table."
5225 const bool implicitly_sized
=
5226 (var
->data
.mode
== ir_var_shader_in
&&
5227 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5228 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5229 (var
->data
.mode
== ir_var_shader_out
&&
5230 state
->stage
== MESA_SHADER_TESS_CTRL
);
5232 if (t
->is_unsized_array() && !implicitly_sized
)
5233 /* Section 10.17 of the GLSL ES 1.00 specification states that
5234 * unsized array declarations have been removed from the language.
5235 * Arrays that are sized using an initializer are still explicitly
5236 * sized. However, GLSL ES 1.00 does not allow array
5237 * initializers. That is only allowed in GLSL ES 3.00.
5239 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5241 * "An array type can also be formed without specifying a size
5242 * if the definition includes an initializer:
5244 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5245 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5250 _mesa_glsl_error(& loc
, state
,
5251 "unsized array declarations are not allowed in "
5255 /* If the declaration is not a redeclaration, there are a few additional
5256 * semantic checks that must be applied. In addition, variable that was
5257 * created for the declaration should be added to the IR stream.
5259 if (earlier
== NULL
) {
5260 validate_identifier(decl
->identifier
, loc
, state
);
5262 /* Add the variable to the symbol table. Note that the initializer's
5263 * IR was already processed earlier (though it hasn't been emitted
5264 * yet), without the variable in scope.
5266 * This differs from most C-like languages, but it follows the GLSL
5267 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5270 * "Within a declaration, the scope of a name starts immediately
5271 * after the initializer if present or immediately after the name
5272 * being declared if not."
5274 if (!state
->symbols
->add_variable(var
)) {
5275 YYLTYPE loc
= this->get_location();
5276 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5277 "current scope", decl
->identifier
);
5281 /* Push the variable declaration to the top. It means that all the
5282 * variable declarations will appear in a funny last-to-first order,
5283 * but otherwise we run into trouble if a function is prototyped, a
5284 * global var is decled, then the function is defined with usage of
5285 * the global var. See glslparsertest's CorrectModule.frag.
5287 instructions
->push_head(var
);
5290 instructions
->append_list(&initializer_instructions
);
5294 /* Generally, variable declarations do not have r-values. However,
5295 * one is used for the declaration in
5297 * while (bool b = some_condition()) {
5301 * so we return the rvalue from the last seen declaration here.
5308 ast_parameter_declarator::hir(exec_list
*instructions
,
5309 struct _mesa_glsl_parse_state
*state
)
5312 const struct glsl_type
*type
;
5313 const char *name
= NULL
;
5314 YYLTYPE loc
= this->get_location();
5316 type
= this->type
->glsl_type(& name
, state
);
5320 _mesa_glsl_error(& loc
, state
,
5321 "invalid type `%s' in declaration of `%s'",
5322 name
, this->identifier
);
5324 _mesa_glsl_error(& loc
, state
,
5325 "invalid type in declaration of `%s'",
5329 type
= glsl_type::error_type
;
5332 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5334 * "Functions that accept no input arguments need not use void in the
5335 * argument list because prototypes (or definitions) are required and
5336 * therefore there is no ambiguity when an empty argument list "( )" is
5337 * declared. The idiom "(void)" as a parameter list is provided for
5340 * Placing this check here prevents a void parameter being set up
5341 * for a function, which avoids tripping up checks for main taking
5342 * parameters and lookups of an unnamed symbol.
5344 if (type
->is_void()) {
5345 if (this->identifier
!= NULL
)
5346 _mesa_glsl_error(& loc
, state
,
5347 "named parameter cannot have type `void'");
5353 if (formal_parameter
&& (this->identifier
== NULL
)) {
5354 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5358 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5359 * call already handled the "vec4[..] foo" case.
5361 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5363 if (!type
->is_error() && type
->is_unsized_array()) {
5364 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5366 type
= glsl_type::error_type
;
5370 ir_variable
*var
= new(ctx
)
5371 ir_variable(type
, this->identifier
, ir_var_function_in
);
5373 /* Apply any specified qualifiers to the parameter declaration. Note that
5374 * for function parameters the default mode is 'in'.
5376 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5379 /* From section 4.1.7 of the GLSL 4.40 spec:
5381 * "Opaque variables cannot be treated as l-values; hence cannot
5382 * be used as out or inout function parameters, nor can they be
5385 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5386 && type
->contains_opaque()) {
5387 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5388 "contain opaque variables");
5389 type
= glsl_type::error_type
;
5392 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5394 * "When calling a function, expressions that do not evaluate to
5395 * l-values cannot be passed to parameters declared as out or inout."
5397 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5399 * "Other binary or unary expressions, non-dereferenced arrays,
5400 * function names, swizzles with repeated fields, and constants
5401 * cannot be l-values."
5403 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5404 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5406 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5408 && !state
->check_version(120, 100, &loc
,
5409 "arrays cannot be out or inout parameters")) {
5410 type
= glsl_type::error_type
;
5413 instructions
->push_tail(var
);
5415 /* Parameter declarations do not have r-values.
5422 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5424 exec_list
*ir_parameters
,
5425 _mesa_glsl_parse_state
*state
)
5427 ast_parameter_declarator
*void_param
= NULL
;
5430 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5431 param
->formal_parameter
= formal
;
5432 param
->hir(ir_parameters
, state
);
5440 if ((void_param
!= NULL
) && (count
> 1)) {
5441 YYLTYPE loc
= void_param
->get_location();
5443 _mesa_glsl_error(& loc
, state
,
5444 "`void' parameter must be only parameter");
5450 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5452 /* IR invariants disallow function declarations or definitions
5453 * nested within other function definitions. But there is no
5454 * requirement about the relative order of function declarations
5455 * and definitions with respect to one another. So simply insert
5456 * the new ir_function block at the end of the toplevel instruction
5459 state
->toplevel_ir
->push_tail(f
);
5464 ast_function::hir(exec_list
*instructions
,
5465 struct _mesa_glsl_parse_state
*state
)
5468 ir_function
*f
= NULL
;
5469 ir_function_signature
*sig
= NULL
;
5470 exec_list hir_parameters
;
5471 YYLTYPE loc
= this->get_location();
5473 const char *const name
= identifier
;
5475 /* New functions are always added to the top-level IR instruction stream,
5476 * so this instruction list pointer is ignored. See also emit_function
5479 (void) instructions
;
5481 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5483 * "Function declarations (prototypes) cannot occur inside of functions;
5484 * they must be at global scope, or for the built-in functions, outside
5485 * the global scope."
5487 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5489 * "User defined functions may only be defined within the global scope."
5491 * Note that this language does not appear in GLSL 1.10.
5493 if ((state
->current_function
!= NULL
) &&
5494 state
->is_version(120, 100)) {
5495 YYLTYPE loc
= this->get_location();
5496 _mesa_glsl_error(&loc
, state
,
5497 "declaration of function `%s' not allowed within "
5498 "function body", name
);
5501 validate_identifier(name
, this->get_location(), state
);
5503 /* Convert the list of function parameters to HIR now so that they can be
5504 * used below to compare this function's signature with previously seen
5505 * signatures for functions with the same name.
5507 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5509 & hir_parameters
, state
);
5511 const char *return_type_name
;
5512 const glsl_type
*return_type
=
5513 this->return_type
->glsl_type(& return_type_name
, state
);
5516 YYLTYPE loc
= this->get_location();
5517 _mesa_glsl_error(&loc
, state
,
5518 "function `%s' has undeclared return type `%s'",
5519 name
, return_type_name
);
5520 return_type
= glsl_type::error_type
;
5523 /* ARB_shader_subroutine states:
5524 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5525 * subroutine(...) to a function declaration."
5527 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5528 YYLTYPE loc
= this->get_location();
5529 _mesa_glsl_error(&loc
, state
,
5530 "function declaration `%s' cannot have subroutine prepended",
5534 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5535 * "No qualifier is allowed on the return type of a function."
5537 if (this->return_type
->has_qualifiers(state
)) {
5538 YYLTYPE loc
= this->get_location();
5539 _mesa_glsl_error(& loc
, state
,
5540 "function `%s' return type has qualifiers", name
);
5543 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5545 * "Arrays are allowed as arguments and as the return type. In both
5546 * cases, the array must be explicitly sized."
5548 if (return_type
->is_unsized_array()) {
5549 YYLTYPE loc
= this->get_location();
5550 _mesa_glsl_error(& loc
, state
,
5551 "function `%s' return type array must be explicitly "
5555 /* From section 4.1.7 of the GLSL 4.40 spec:
5557 * "[Opaque types] can only be declared as function parameters
5558 * or uniform-qualified variables."
5560 if (return_type
->contains_opaque()) {
5561 YYLTYPE loc
= this->get_location();
5562 _mesa_glsl_error(&loc
, state
,
5563 "function `%s' return type can't contain an opaque type",
5568 if (return_type
->is_subroutine()) {
5569 YYLTYPE loc
= this->get_location();
5570 _mesa_glsl_error(&loc
, state
,
5571 "function `%s' return type can't be a subroutine type",
5576 /* Create an ir_function if one doesn't already exist. */
5577 f
= state
->symbols
->get_function(name
);
5579 f
= new(ctx
) ir_function(name
);
5580 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5581 if (!state
->symbols
->add_function(f
)) {
5582 /* This function name shadows a non-function use of the same name. */
5583 YYLTYPE loc
= this->get_location();
5584 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5585 "non-function", name
);
5589 emit_function(state
, f
);
5592 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5594 * "A shader cannot redefine or overload built-in functions."
5596 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5598 * "User code can overload the built-in functions but cannot redefine
5601 if (state
->es_shader
&& state
->language_version
>= 300) {
5602 /* Local shader has no exact candidates; check the built-ins. */
5603 _mesa_glsl_initialize_builtin_functions();
5604 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5605 YYLTYPE loc
= this->get_location();
5606 _mesa_glsl_error(& loc
, state
,
5607 "A shader cannot redefine or overload built-in "
5608 "function `%s' in GLSL ES 3.00", name
);
5613 /* Verify that this function's signature either doesn't match a previously
5614 * seen signature for a function with the same name, or, if a match is found,
5615 * that the previously seen signature does not have an associated definition.
5617 if (state
->es_shader
|| f
->has_user_signature()) {
5618 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5620 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5621 if (badvar
!= NULL
) {
5622 YYLTYPE loc
= this->get_location();
5624 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5625 "qualifiers don't match prototype", name
, badvar
);
5628 if (sig
->return_type
!= return_type
) {
5629 YYLTYPE loc
= this->get_location();
5631 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5632 "match prototype", name
);
5635 if (sig
->is_defined
) {
5636 if (is_definition
) {
5637 YYLTYPE loc
= this->get_location();
5638 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5640 /* We just encountered a prototype that exactly matches a
5641 * function that's already been defined. This is redundant,
5642 * and we should ignore it.
5650 /* Verify the return type of main() */
5651 if (strcmp(name
, "main") == 0) {
5652 if (! return_type
->is_void()) {
5653 YYLTYPE loc
= this->get_location();
5655 _mesa_glsl_error(& loc
, state
, "main() must return void");
5658 if (!hir_parameters
.is_empty()) {
5659 YYLTYPE loc
= this->get_location();
5661 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5665 /* Finish storing the information about this new function in its signature.
5668 sig
= new(ctx
) ir_function_signature(return_type
);
5669 f
->add_signature(sig
);
5672 sig
->replace_parameters(&hir_parameters
);
5675 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5678 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5679 unsigned qual_index
;
5680 if (process_qualifier_constant(state
, &loc
, "index",
5681 this->return_type
->qualifier
.index
,
5683 if (!state
->has_explicit_uniform_location()) {
5684 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5685 "GL_ARB_explicit_uniform_location or "
5687 } else if (qual_index
>= MAX_SUBROUTINES
) {
5688 _mesa_glsl_error(&loc
, state
,
5689 "invalid subroutine index (%d) index must "
5690 "be a number between 0 and "
5691 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5692 MAX_SUBROUTINES
- 1);
5694 f
->subroutine_index
= qual_index
;
5699 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5700 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5701 f
->num_subroutine_types
);
5703 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5704 const struct glsl_type
*type
;
5705 /* the subroutine type must be already declared */
5706 type
= state
->symbols
->get_type(decl
->identifier
);
5708 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5711 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5712 ir_function
*fn
= state
->subroutine_types
[i
];
5713 ir_function_signature
*tsig
= NULL
;
5715 if (strcmp(fn
->name
, decl
->identifier
))
5718 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5721 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5723 if (tsig
->return_type
!= sig
->return_type
) {
5724 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5728 f
->subroutine_types
[idx
++] = type
;
5730 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5732 state
->num_subroutines
+ 1);
5733 state
->subroutines
[state
->num_subroutines
] = f
;
5734 state
->num_subroutines
++;
5738 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5739 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5740 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5743 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5745 state
->num_subroutine_types
+ 1);
5746 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5747 state
->num_subroutine_types
++;
5749 f
->is_subroutine
= true;
5752 /* Function declarations (prototypes) do not have r-values.
5759 ast_function_definition::hir(exec_list
*instructions
,
5760 struct _mesa_glsl_parse_state
*state
)
5762 prototype
->is_definition
= true;
5763 prototype
->hir(instructions
, state
);
5765 ir_function_signature
*signature
= prototype
->signature
;
5766 if (signature
== NULL
)
5769 assert(state
->current_function
== NULL
);
5770 state
->current_function
= signature
;
5771 state
->found_return
= false;
5773 /* Duplicate parameters declared in the prototype as concrete variables.
5774 * Add these to the symbol table.
5776 state
->symbols
->push_scope();
5777 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5778 assert(var
->as_variable() != NULL
);
5780 /* The only way a parameter would "exist" is if two parameters have
5783 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5784 YYLTYPE loc
= this->get_location();
5786 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5788 state
->symbols
->add_variable(var
);
5792 /* Convert the body of the function to HIR. */
5793 this->body
->hir(&signature
->body
, state
);
5794 signature
->is_defined
= true;
5796 state
->symbols
->pop_scope();
5798 assert(state
->current_function
== signature
);
5799 state
->current_function
= NULL
;
5801 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5802 YYLTYPE loc
= this->get_location();
5803 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5804 "%s, but no return statement",
5805 signature
->function_name(),
5806 signature
->return_type
->name
);
5809 /* Function definitions do not have r-values.
5816 ast_jump_statement::hir(exec_list
*instructions
,
5817 struct _mesa_glsl_parse_state
*state
)
5824 assert(state
->current_function
);
5826 if (opt_return_value
) {
5827 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5829 /* The value of the return type can be NULL if the shader says
5830 * 'return foo();' and foo() is a function that returns void.
5832 * NOTE: The GLSL spec doesn't say that this is an error. The type
5833 * of the return value is void. If the return type of the function is
5834 * also void, then this should compile without error. Seriously.
5836 const glsl_type
*const ret_type
=
5837 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5839 /* Implicit conversions are not allowed for return values prior to
5840 * ARB_shading_language_420pack.
5842 if (state
->current_function
->return_type
!= ret_type
) {
5843 YYLTYPE loc
= this->get_location();
5845 if (state
->has_420pack()) {
5846 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5848 _mesa_glsl_error(& loc
, state
,
5849 "could not implicitly convert return value "
5850 "to %s, in function `%s'",
5851 state
->current_function
->return_type
->name
,
5852 state
->current_function
->function_name());
5855 _mesa_glsl_error(& loc
, state
,
5856 "`return' with wrong type %s, in function `%s' "
5859 state
->current_function
->function_name(),
5860 state
->current_function
->return_type
->name
);
5862 } else if (state
->current_function
->return_type
->base_type
==
5864 YYLTYPE loc
= this->get_location();
5866 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5867 * specs add a clarification:
5869 * "A void function can only use return without a return argument, even if
5870 * the return argument has void type. Return statements only accept values:
5873 * void func2() { return func1(); } // illegal return statement"
5875 _mesa_glsl_error(& loc
, state
,
5876 "void functions can only use `return' without a "
5880 inst
= new(ctx
) ir_return(ret
);
5882 if (state
->current_function
->return_type
->base_type
!=
5884 YYLTYPE loc
= this->get_location();
5886 _mesa_glsl_error(& loc
, state
,
5887 "`return' with no value, in function %s returning "
5889 state
->current_function
->function_name());
5891 inst
= new(ctx
) ir_return
;
5894 state
->found_return
= true;
5895 instructions
->push_tail(inst
);
5900 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5901 YYLTYPE loc
= this->get_location();
5903 _mesa_glsl_error(& loc
, state
,
5904 "`discard' may only appear in a fragment shader");
5906 instructions
->push_tail(new(ctx
) ir_discard
);
5911 if (mode
== ast_continue
&&
5912 state
->loop_nesting_ast
== NULL
) {
5913 YYLTYPE loc
= this->get_location();
5915 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5916 } else if (mode
== ast_break
&&
5917 state
->loop_nesting_ast
== NULL
&&
5918 state
->switch_state
.switch_nesting_ast
== NULL
) {
5919 YYLTYPE loc
= this->get_location();
5921 _mesa_glsl_error(& loc
, state
,
5922 "break may only appear in a loop or a switch");
5924 /* For a loop, inline the for loop expression again, since we don't
5925 * know where near the end of the loop body the normal copy of it is
5926 * going to be placed. Same goes for the condition for a do-while
5929 if (state
->loop_nesting_ast
!= NULL
&&
5930 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5931 if (state
->loop_nesting_ast
->rest_expression
) {
5932 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5935 if (state
->loop_nesting_ast
->mode
==
5936 ast_iteration_statement::ast_do_while
) {
5937 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5941 if (state
->switch_state
.is_switch_innermost
&&
5942 mode
== ast_continue
) {
5943 /* Set 'continue_inside' to true. */
5944 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5945 ir_dereference_variable
*deref_continue_inside_var
=
5946 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5947 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5950 /* Break out from the switch, continue for the loop will
5951 * be called right after switch. */
5952 ir_loop_jump
*const jump
=
5953 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5954 instructions
->push_tail(jump
);
5956 } else if (state
->switch_state
.is_switch_innermost
&&
5957 mode
== ast_break
) {
5958 /* Force break out of switch by inserting a break. */
5959 ir_loop_jump
*const jump
=
5960 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5961 instructions
->push_tail(jump
);
5963 ir_loop_jump
*const jump
=
5964 new(ctx
) ir_loop_jump((mode
== ast_break
)
5965 ? ir_loop_jump::jump_break
5966 : ir_loop_jump::jump_continue
);
5967 instructions
->push_tail(jump
);
5974 /* Jump instructions do not have r-values.
5981 ast_selection_statement::hir(exec_list
*instructions
,
5982 struct _mesa_glsl_parse_state
*state
)
5986 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5988 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5990 * "Any expression whose type evaluates to a Boolean can be used as the
5991 * conditional expression bool-expression. Vector types are not accepted
5992 * as the expression to if."
5994 * The checks are separated so that higher quality diagnostics can be
5995 * generated for cases where both rules are violated.
5997 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5998 YYLTYPE loc
= this->condition
->get_location();
6000 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6004 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6006 if (then_statement
!= NULL
) {
6007 state
->symbols
->push_scope();
6008 then_statement
->hir(& stmt
->then_instructions
, state
);
6009 state
->symbols
->pop_scope();
6012 if (else_statement
!= NULL
) {
6013 state
->symbols
->push_scope();
6014 else_statement
->hir(& stmt
->else_instructions
, state
);
6015 state
->symbols
->pop_scope();
6018 instructions
->push_tail(stmt
);
6020 /* if-statements do not have r-values.
6026 /* Used for detection of duplicate case values, compare
6027 * given contents directly.
6030 compare_case_value(const void *a
, const void *b
)
6032 return *(unsigned *) a
== *(unsigned *) b
;
6036 /* Used for detection of duplicate case values, just
6037 * returns key contents as is.
6040 key_contents(const void *key
)
6042 return *(unsigned *) key
;
6047 ast_switch_statement::hir(exec_list
*instructions
,
6048 struct _mesa_glsl_parse_state
*state
)
6052 ir_rvalue
*const test_expression
=
6053 this->test_expression
->hir(instructions
, state
);
6055 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6057 * "The type of init-expression in a switch statement must be a
6060 if (!test_expression
->type
->is_scalar() ||
6061 !test_expression
->type
->is_integer()) {
6062 YYLTYPE loc
= this->test_expression
->get_location();
6064 _mesa_glsl_error(& loc
,
6066 "switch-statement expression must be scalar "
6070 /* Track the switch-statement nesting in a stack-like manner.
6072 struct glsl_switch_state saved
= state
->switch_state
;
6074 state
->switch_state
.is_switch_innermost
= true;
6075 state
->switch_state
.switch_nesting_ast
= this;
6076 state
->switch_state
.labels_ht
=
6077 _mesa_hash_table_create(NULL
, key_contents
,
6078 compare_case_value
);
6079 state
->switch_state
.previous_default
= NULL
;
6081 /* Initalize is_fallthru state to false.
6083 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6084 state
->switch_state
.is_fallthru_var
=
6085 new(ctx
) ir_variable(glsl_type::bool_type
,
6086 "switch_is_fallthru_tmp",
6088 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6090 ir_dereference_variable
*deref_is_fallthru_var
=
6091 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6092 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6095 /* Initialize continue_inside state to false.
6097 state
->switch_state
.continue_inside
=
6098 new(ctx
) ir_variable(glsl_type::bool_type
,
6099 "continue_inside_tmp",
6101 instructions
->push_tail(state
->switch_state
.continue_inside
);
6103 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6104 ir_dereference_variable
*deref_continue_inside_var
=
6105 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6106 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6109 state
->switch_state
.run_default
=
6110 new(ctx
) ir_variable(glsl_type::bool_type
,
6113 instructions
->push_tail(state
->switch_state
.run_default
);
6115 /* Loop around the switch is used for flow control. */
6116 ir_loop
* loop
= new(ctx
) ir_loop();
6117 instructions
->push_tail(loop
);
6119 /* Cache test expression.
6121 test_to_hir(&loop
->body_instructions
, state
);
6123 /* Emit code for body of switch stmt.
6125 body
->hir(&loop
->body_instructions
, state
);
6127 /* Insert a break at the end to exit loop. */
6128 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6129 loop
->body_instructions
.push_tail(jump
);
6131 /* If we are inside loop, check if continue got called inside switch. */
6132 if (state
->loop_nesting_ast
!= NULL
) {
6133 ir_dereference_variable
*deref_continue_inside
=
6134 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6135 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6136 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6138 if (state
->loop_nesting_ast
!= NULL
) {
6139 if (state
->loop_nesting_ast
->rest_expression
) {
6140 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6143 if (state
->loop_nesting_ast
->mode
==
6144 ast_iteration_statement::ast_do_while
) {
6145 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6148 irif
->then_instructions
.push_tail(jump
);
6149 instructions
->push_tail(irif
);
6152 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6154 state
->switch_state
= saved
;
6156 /* Switch statements do not have r-values. */
6162 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6163 struct _mesa_glsl_parse_state
*state
)
6167 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6168 * on the switch test case. The first one would be already raised when
6169 * getting the test_expression at ast_switch_statement::hir
6171 test_expression
->set_is_lhs(true);
6172 /* Cache value of test expression. */
6173 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6175 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6178 ir_dereference_variable
*deref_test_var
=
6179 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6181 instructions
->push_tail(state
->switch_state
.test_var
);
6182 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6187 ast_switch_body::hir(exec_list
*instructions
,
6188 struct _mesa_glsl_parse_state
*state
)
6191 stmts
->hir(instructions
, state
);
6193 /* Switch bodies do not have r-values. */
6198 ast_case_statement_list::hir(exec_list
*instructions
,
6199 struct _mesa_glsl_parse_state
*state
)
6201 exec_list default_case
, after_default
, tmp
;
6203 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6204 case_stmt
->hir(&tmp
, state
);
6207 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6208 default_case
.append_list(&tmp
);
6212 /* If default case found, append 'after_default' list. */
6213 if (!default_case
.is_empty())
6214 after_default
.append_list(&tmp
);
6216 instructions
->append_list(&tmp
);
6219 /* Handle the default case. This is done here because default might not be
6220 * the last case. We need to add checks against following cases first to see
6221 * if default should be chosen or not.
6223 if (!default_case
.is_empty()) {
6225 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6226 ir_dereference_variable
*deref_run_default_var
=
6227 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6229 /* Choose to run default case initially, following conditional
6230 * assignments might change this.
6232 ir_assignment
*const init_var
=
6233 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6234 instructions
->push_tail(init_var
);
6236 /* Default case was the last one, no checks required. */
6237 if (after_default
.is_empty()) {
6238 instructions
->append_list(&default_case
);
6242 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6243 ir_assignment
*assign
= ir
->as_assignment();
6248 /* Clone the check between case label and init expression. */
6249 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6250 ir_expression
*clone
= exp
->clone(state
, NULL
);
6252 ir_dereference_variable
*deref_var
=
6253 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6254 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6256 ir_assignment
*const set_false
=
6257 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6259 instructions
->push_tail(set_false
);
6262 /* Append default case and all cases after it. */
6263 instructions
->append_list(&default_case
);
6264 instructions
->append_list(&after_default
);
6267 /* Case statements do not have r-values. */
6272 ast_case_statement::hir(exec_list
*instructions
,
6273 struct _mesa_glsl_parse_state
*state
)
6275 labels
->hir(instructions
, state
);
6277 /* Guard case statements depending on fallthru state. */
6278 ir_dereference_variable
*const deref_fallthru_guard
=
6279 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6280 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6282 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6283 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6285 instructions
->push_tail(test_fallthru
);
6287 /* Case statements do not have r-values. */
6293 ast_case_label_list::hir(exec_list
*instructions
,
6294 struct _mesa_glsl_parse_state
*state
)
6296 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6297 label
->hir(instructions
, state
);
6299 /* Case labels do not have r-values. */
6304 ast_case_label::hir(exec_list
*instructions
,
6305 struct _mesa_glsl_parse_state
*state
)
6309 ir_dereference_variable
*deref_fallthru_var
=
6310 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6312 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6314 /* If not default case, ... */
6315 if (this->test_value
!= NULL
) {
6316 /* Conditionally set fallthru state based on
6317 * comparison of cached test expression value to case label.
6319 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6320 ir_constant
*label_const
= label_rval
->constant_expression_value();
6323 YYLTYPE loc
= this->test_value
->get_location();
6325 _mesa_glsl_error(& loc
, state
,
6326 "switch statement case label must be a "
6327 "constant expression");
6329 /* Stuff a dummy value in to allow processing to continue. */
6330 label_const
= new(ctx
) ir_constant(0);
6333 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6334 (void *)(uintptr_t)&label_const
->value
.u
[0]);
6337 ast_expression
*previous_label
= (ast_expression
*) entry
->data
;
6338 YYLTYPE loc
= this->test_value
->get_location();
6339 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6341 loc
= previous_label
->get_location();
6342 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6344 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6345 (void *)(uintptr_t)&label_const
->value
.u
[0],
6350 ir_dereference_variable
*deref_test_var
=
6351 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6353 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6358 * From GLSL 4.40 specification section 6.2 ("Selection"):
6360 * "The type of the init-expression value in a switch statement must
6361 * be a scalar int or uint. The type of the constant-expression value
6362 * in a case label also must be a scalar int or uint. When any pair
6363 * of these values is tested for "equal value" and the types do not
6364 * match, an implicit conversion will be done to convert the int to a
6365 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6368 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6369 YYLTYPE loc
= this->test_value
->get_location();
6371 const glsl_type
*type_a
= label_const
->type
;
6372 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6374 /* Check if int->uint implicit conversion is supported. */
6375 bool integer_conversion_supported
=
6376 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6379 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6380 !integer_conversion_supported
) {
6381 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6382 "init-expression and case label (%s != %s)",
6383 type_a
->name
, type_b
->name
);
6385 /* Conversion of the case label. */
6386 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6387 if (!apply_implicit_conversion(glsl_type::uint_type
,
6388 test_cond
->operands
[0], state
))
6389 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6391 /* Conversion of the init-expression value. */
6392 if (!apply_implicit_conversion(glsl_type::uint_type
,
6393 test_cond
->operands
[1], state
))
6394 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6399 ir_assignment
*set_fallthru_on_test
=
6400 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6402 instructions
->push_tail(set_fallthru_on_test
);
6403 } else { /* default case */
6404 if (state
->switch_state
.previous_default
) {
6405 YYLTYPE loc
= this->get_location();
6406 _mesa_glsl_error(& loc
, state
,
6407 "multiple default labels in one switch");
6409 loc
= state
->switch_state
.previous_default
->get_location();
6410 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6412 state
->switch_state
.previous_default
= this;
6414 /* Set fallthru condition on 'run_default' bool. */
6415 ir_dereference_variable
*deref_run_default
=
6416 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6417 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6418 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6422 /* Set falltrhu state. */
6423 ir_assignment
*set_fallthru
=
6424 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6426 instructions
->push_tail(set_fallthru
);
6429 /* Case statements do not have r-values. */
6434 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6435 struct _mesa_glsl_parse_state
*state
)
6439 if (condition
!= NULL
) {
6440 ir_rvalue
*const cond
=
6441 condition
->hir(instructions
, state
);
6444 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6445 YYLTYPE loc
= condition
->get_location();
6447 _mesa_glsl_error(& loc
, state
,
6448 "loop condition must be scalar boolean");
6450 /* As the first code in the loop body, generate a block that looks
6451 * like 'if (!condition) break;' as the loop termination condition.
6453 ir_rvalue
*const not_cond
=
6454 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6456 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6458 ir_jump
*const break_stmt
=
6459 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6461 if_stmt
->then_instructions
.push_tail(break_stmt
);
6462 instructions
->push_tail(if_stmt
);
6469 ast_iteration_statement::hir(exec_list
*instructions
,
6470 struct _mesa_glsl_parse_state
*state
)
6474 /* For-loops and while-loops start a new scope, but do-while loops do not.
6476 if (mode
!= ast_do_while
)
6477 state
->symbols
->push_scope();
6479 if (init_statement
!= NULL
)
6480 init_statement
->hir(instructions
, state
);
6482 ir_loop
*const stmt
= new(ctx
) ir_loop();
6483 instructions
->push_tail(stmt
);
6485 /* Track the current loop nesting. */
6486 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6488 state
->loop_nesting_ast
= this;
6490 /* Likewise, indicate that following code is closest to a loop,
6491 * NOT closest to a switch.
6493 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6494 state
->switch_state
.is_switch_innermost
= false;
6496 if (mode
!= ast_do_while
)
6497 condition_to_hir(&stmt
->body_instructions
, state
);
6500 body
->hir(& stmt
->body_instructions
, state
);
6502 if (rest_expression
!= NULL
)
6503 rest_expression
->hir(& stmt
->body_instructions
, state
);
6505 if (mode
== ast_do_while
)
6506 condition_to_hir(&stmt
->body_instructions
, state
);
6508 if (mode
!= ast_do_while
)
6509 state
->symbols
->pop_scope();
6511 /* Restore previous nesting before returning. */
6512 state
->loop_nesting_ast
= nesting_ast
;
6513 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6515 /* Loops do not have r-values.
6522 * Determine if the given type is valid for establishing a default precision
6525 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6527 * "The precision statement
6529 * precision precision-qualifier type;
6531 * can be used to establish a default precision qualifier. The type field
6532 * can be either int or float or any of the sampler types, and the
6533 * precision-qualifier can be lowp, mediump, or highp."
6535 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6536 * qualifiers on sampler types, but this seems like an oversight (since the
6537 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6538 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6542 is_valid_default_precision_type(const struct glsl_type
*const type
)
6547 switch (type
->base_type
) {
6549 case GLSL_TYPE_FLOAT
:
6550 /* "int" and "float" are valid, but vectors and matrices are not. */
6551 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6552 case GLSL_TYPE_SAMPLER
:
6553 case GLSL_TYPE_IMAGE
:
6554 case GLSL_TYPE_ATOMIC_UINT
:
6563 ast_type_specifier::hir(exec_list
*instructions
,
6564 struct _mesa_glsl_parse_state
*state
)
6566 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6569 YYLTYPE loc
= this->get_location();
6571 /* If this is a precision statement, check that the type to which it is
6572 * applied is either float or int.
6574 * From section 4.5.3 of the GLSL 1.30 spec:
6575 * "The precision statement
6576 * precision precision-qualifier type;
6577 * can be used to establish a default precision qualifier. The type
6578 * field can be either int or float [...]. Any other types or
6579 * qualifiers will result in an error.
6581 if (this->default_precision
!= ast_precision_none
) {
6582 if (!state
->check_precision_qualifiers_allowed(&loc
))
6585 if (this->structure
!= NULL
) {
6586 _mesa_glsl_error(&loc
, state
,
6587 "precision qualifiers do not apply to structures");
6591 if (this->array_specifier
!= NULL
) {
6592 _mesa_glsl_error(&loc
, state
,
6593 "default precision statements do not apply to "
6598 const struct glsl_type
*const type
=
6599 state
->symbols
->get_type(this->type_name
);
6600 if (!is_valid_default_precision_type(type
)) {
6601 _mesa_glsl_error(&loc
, state
,
6602 "default precision statements apply only to "
6603 "float, int, and opaque types");
6607 if (state
->es_shader
) {
6608 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6611 * "Non-precision qualified declarations will use the precision
6612 * qualifier specified in the most recent precision statement
6613 * that is still in scope. The precision statement has the same
6614 * scoping rules as variable declarations. If it is declared
6615 * inside a compound statement, its effect stops at the end of
6616 * the innermost statement it was declared in. Precision
6617 * statements in nested scopes override precision statements in
6618 * outer scopes. Multiple precision statements for the same basic
6619 * type can appear inside the same scope, with later statements
6620 * overriding earlier statements within that scope."
6622 * Default precision specifications follow the same scope rules as
6623 * variables. So, we can track the state of the default precision
6624 * qualifiers in the symbol table, and the rules will just work. This
6625 * is a slight abuse of the symbol table, but it has the semantics
6628 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6629 this->default_precision
);
6632 /* FINISHME: Translate precision statements into IR. */
6636 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6637 * process_record_constructor() can do type-checking on C-style initializer
6638 * expressions of structs, but ast_struct_specifier should only be translated
6639 * to HIR if it is declaring the type of a structure.
6641 * The ->is_declaration field is false for initializers of variables
6642 * declared separately from the struct's type definition.
6644 * struct S { ... }; (is_declaration = true)
6645 * struct T { ... } t = { ... }; (is_declaration = true)
6646 * S s = { ... }; (is_declaration = false)
6648 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6649 return this->structure
->hir(instructions
, state
);
6656 * Process a structure or interface block tree into an array of structure fields
6658 * After parsing, where there are some syntax differnces, structures and
6659 * interface blocks are almost identical. They are similar enough that the
6660 * AST for each can be processed the same way into a set of
6661 * \c glsl_struct_field to describe the members.
6663 * If we're processing an interface block, var_mode should be the type of the
6664 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6665 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6669 * The number of fields processed. A pointer to the array structure fields is
6670 * stored in \c *fields_ret.
6673 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6674 struct _mesa_glsl_parse_state
*state
,
6675 exec_list
*declarations
,
6676 glsl_struct_field
**fields_ret
,
6678 enum glsl_matrix_layout matrix_layout
,
6679 bool allow_reserved_names
,
6680 ir_variable_mode var_mode
,
6681 ast_type_qualifier
*layout
,
6682 unsigned block_stream
,
6683 unsigned block_xfb_buffer
,
6684 unsigned block_xfb_offset
,
6685 unsigned expl_location
,
6686 unsigned expl_align
)
6688 unsigned decl_count
= 0;
6689 unsigned next_offset
= 0;
6691 /* Make an initial pass over the list of fields to determine how
6692 * many there are. Each element in this list is an ast_declarator_list.
6693 * This means that we actually need to count the number of elements in the
6694 * 'declarations' list in each of the elements.
6696 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6697 decl_count
+= decl_list
->declarations
.length();
6700 /* Allocate storage for the fields and process the field
6701 * declarations. As the declarations are processed, try to also convert
6702 * the types to HIR. This ensures that structure definitions embedded in
6703 * other structure definitions or in interface blocks are processed.
6705 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
6708 bool first_member
= true;
6709 bool first_member_has_explicit_location
= false;
6712 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6713 const char *type_name
;
6714 YYLTYPE loc
= decl_list
->get_location();
6716 decl_list
->type
->specifier
->hir(instructions
, state
);
6718 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6720 * "Anonymous structures are not supported; so embedded structures
6721 * must have a declarator. A name given to an embedded struct is
6722 * scoped at the same level as the struct it is embedded in."
6724 * The same section of the GLSL 1.20 spec says:
6726 * "Anonymous structures are not supported. Embedded structures are
6729 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6730 * embedded structures in 1.10 only.
6732 if (state
->language_version
!= 110 &&
6733 decl_list
->type
->specifier
->structure
!= NULL
)
6734 _mesa_glsl_error(&loc
, state
,
6735 "embedded structure declarations are not allowed");
6737 const glsl_type
*decl_type
=
6738 decl_list
->type
->glsl_type(& type_name
, state
);
6740 const struct ast_type_qualifier
*const qual
=
6741 &decl_list
->type
->qualifier
;
6743 /* From section 4.3.9 of the GLSL 4.40 spec:
6745 * "[In interface blocks] opaque types are not allowed."
6747 * It should be impossible for decl_type to be NULL here. Cases that
6748 * might naturally lead to decl_type being NULL, especially for the
6749 * is_interface case, will have resulted in compilation having
6750 * already halted due to a syntax error.
6755 if (decl_type
->contains_opaque()) {
6756 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6757 "interface block contains opaque variable");
6760 if (decl_type
->contains_atomic()) {
6761 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6763 * "Members of structures cannot be declared as atomic counter
6766 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6769 if (decl_type
->contains_image()) {
6770 /* FINISHME: Same problem as with atomic counters.
6771 * FINISHME: Request clarification from Khronos and add
6772 * FINISHME: spec quotation here.
6774 _mesa_glsl_error(&loc
, state
, "image in structure");
6778 if (qual
->flags
.q
.explicit_binding
) {
6779 _mesa_glsl_error(&loc
, state
,
6780 "binding layout qualifier cannot be applied "
6781 "to struct or interface block members");
6785 if (!first_member
) {
6786 if (!layout
->flags
.q
.explicit_location
&&
6787 ((first_member_has_explicit_location
&&
6788 !qual
->flags
.q
.explicit_location
) ||
6789 (!first_member_has_explicit_location
&&
6790 qual
->flags
.q
.explicit_location
))) {
6791 _mesa_glsl_error(&loc
, state
,
6792 "when block-level location layout qualifier "
6793 "is not supplied either all members must "
6794 "have a location layout qualifier or all "
6795 "members must not have a location layout "
6799 first_member
= false;
6800 first_member_has_explicit_location
=
6801 qual
->flags
.q
.explicit_location
;
6805 if (qual
->flags
.q
.std140
||
6806 qual
->flags
.q
.std430
||
6807 qual
->flags
.q
.packed
||
6808 qual
->flags
.q
.shared
) {
6809 _mesa_glsl_error(&loc
, state
,
6810 "uniform/shader storage block layout qualifiers "
6811 "std140, std430, packed, and shared can only be "
6812 "applied to uniform/shader storage blocks, not "
6816 if (qual
->flags
.q
.constant
) {
6817 _mesa_glsl_error(&loc
, state
,
6818 "const storage qualifier cannot be applied "
6819 "to struct or interface block members");
6822 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6824 * "A block member may be declared with a stream identifier, but
6825 * the specified stream must match the stream associated with the
6826 * containing block."
6828 if (qual
->flags
.q
.explicit_stream
) {
6829 unsigned qual_stream
;
6830 if (process_qualifier_constant(state
, &loc
, "stream",
6831 qual
->stream
, &qual_stream
) &&
6832 qual_stream
!= block_stream
) {
6833 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6834 "interface block member does not match "
6835 "the interface block (%u vs %u)", qual_stream
,
6841 unsigned explicit_xfb_buffer
= 0;
6842 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6843 unsigned qual_xfb_buffer
;
6844 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6845 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6846 explicit_xfb_buffer
= 1;
6847 if (qual_xfb_buffer
!= block_xfb_buffer
)
6848 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6849 "interface block member does not match "
6850 "the interface block (%u vs %u)",
6851 qual_xfb_buffer
, block_xfb_buffer
);
6853 xfb_buffer
= (int) qual_xfb_buffer
;
6856 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
6857 xfb_buffer
= (int) block_xfb_buffer
;
6860 int xfb_stride
= -1;
6861 if (qual
->flags
.q
.explicit_xfb_stride
) {
6862 unsigned qual_xfb_stride
;
6863 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6864 qual
->xfb_stride
, &qual_xfb_stride
)) {
6865 xfb_stride
= (int) qual_xfb_stride
;
6869 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6870 _mesa_glsl_error(&loc
, state
,
6871 "interpolation qualifiers cannot be used "
6872 "with uniform interface blocks");
6875 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6876 qual
->has_auxiliary_storage()) {
6877 _mesa_glsl_error(&loc
, state
,
6878 "auxiliary storage qualifiers cannot be used "
6879 "in uniform blocks or structures.");
6882 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6883 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6884 _mesa_glsl_error(&loc
, state
,
6885 "row_major and column_major can only be "
6886 "applied to interface blocks");
6888 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6891 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6892 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6893 "readonly and writeonly.");
6896 foreach_list_typed (ast_declaration
, decl
, link
,
6897 &decl_list
->declarations
) {
6898 YYLTYPE loc
= decl
->get_location();
6900 if (!allow_reserved_names
)
6901 validate_identifier(decl
->identifier
, loc
, state
);
6903 const struct glsl_type
*field_type
=
6904 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6905 validate_array_dimensions(field_type
, state
, &loc
);
6906 fields
[i
].type
= field_type
;
6907 fields
[i
].name
= decl
->identifier
;
6908 fields
[i
].interpolation
=
6909 interpret_interpolation_qualifier(qual
, field_type
,
6910 var_mode
, state
, &loc
);
6911 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6912 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6913 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6914 fields
[i
].precision
= qual
->precision
;
6915 fields
[i
].offset
= -1;
6916 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6917 fields
[i
].xfb_buffer
= xfb_buffer
;
6918 fields
[i
].xfb_stride
= xfb_stride
;
6920 if (qual
->flags
.q
.explicit_location
) {
6921 unsigned qual_location
;
6922 if (process_qualifier_constant(state
, &loc
, "location",
6923 qual
->location
, &qual_location
)) {
6924 fields
[i
].location
= qual_location
+
6925 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
6926 expl_location
= fields
[i
].location
+
6927 fields
[i
].type
->count_attribute_slots(false);
6930 if (layout
&& layout
->flags
.q
.explicit_location
) {
6931 fields
[i
].location
= expl_location
;
6932 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6934 fields
[i
].location
= -1;
6938 /* Offset can only be used with std430 and std140 layouts an initial
6939 * value of 0 is used for error detection.
6945 if (qual
->flags
.q
.row_major
||
6946 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6952 if(layout
->flags
.q
.std140
) {
6953 align
= field_type
->std140_base_alignment(row_major
);
6954 size
= field_type
->std140_size(row_major
);
6955 } else if (layout
->flags
.q
.std430
) {
6956 align
= field_type
->std430_base_alignment(row_major
);
6957 size
= field_type
->std430_size(row_major
);
6961 if (qual
->flags
.q
.explicit_offset
) {
6962 unsigned qual_offset
;
6963 if (process_qualifier_constant(state
, &loc
, "offset",
6964 qual
->offset
, &qual_offset
)) {
6965 if (align
!= 0 && size
!= 0) {
6966 if (next_offset
> qual_offset
)
6967 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6968 "offset overlaps previous member");
6970 if (qual_offset
% align
) {
6971 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6972 "must be a multiple of the base "
6973 "alignment of %s", field_type
->name
);
6975 fields
[i
].offset
= qual_offset
;
6976 next_offset
= glsl_align(qual_offset
+ size
, align
);
6978 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6979 "with std430 and std140 layouts");
6984 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6985 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6987 if (align
== 0 || size
== 0) {
6988 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6989 "std430 and std140 layouts");
6990 } else if (qual
->flags
.q
.explicit_align
) {
6991 unsigned member_align
;
6992 if (process_qualifier_constant(state
, &loc
, "align",
6993 qual
->align
, &member_align
)) {
6994 if (member_align
== 0 ||
6995 member_align
& (member_align
- 1)) {
6996 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6997 "in not a power of 2");
6999 fields
[i
].offset
= glsl_align(offset
, member_align
);
7000 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7004 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7005 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7007 } else if (!qual
->flags
.q
.explicit_offset
) {
7008 if (align
!= 0 && size
!= 0)
7009 next_offset
= glsl_align(next_offset
+ size
, align
);
7012 /* From the ARB_enhanced_layouts spec:
7014 * "The given offset applies to the first component of the first
7015 * member of the qualified entity. Then, within the qualified
7016 * entity, subsequent components are each assigned, in order, to
7017 * the next available offset aligned to a multiple of that
7018 * component's size. Aggregate types are flattened down to the
7019 * component level to get this sequence of components."
7021 if (qual
->flags
.q
.explicit_xfb_offset
) {
7022 unsigned xfb_offset
;
7023 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7024 qual
->offset
, &xfb_offset
)) {
7025 fields
[i
].offset
= xfb_offset
;
7026 block_xfb_offset
= fields
[i
].offset
+
7027 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
7030 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7031 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7032 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7034 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
7038 /* Propogate row- / column-major information down the fields of the
7039 * structure or interface block. Structures need this data because
7040 * the structure may contain a structure that contains ... a matrix
7041 * that need the proper layout.
7043 if (is_interface
&& layout
&&
7044 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7045 (field_type
->without_array()->is_matrix()
7046 || field_type
->without_array()->is_record())) {
7047 /* If no layout is specified for the field, inherit the layout
7050 fields
[i
].matrix_layout
= matrix_layout
;
7052 if (qual
->flags
.q
.row_major
)
7053 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7054 else if (qual
->flags
.q
.column_major
)
7055 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7057 /* If we're processing an uniform or buffer block, the matrix
7058 * layout must be decided by this point.
7060 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7061 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7064 /* Image qualifiers are allowed on buffer variables, which can only
7065 * be defined inside shader storage buffer objects
7067 if (layout
&& var_mode
== ir_var_shader_storage
) {
7068 /* For readonly and writeonly qualifiers the field definition,
7069 * if set, overwrites the layout qualifier.
7071 if (qual
->flags
.q
.read_only
) {
7072 fields
[i
].image_read_only
= true;
7073 fields
[i
].image_write_only
= false;
7074 } else if (qual
->flags
.q
.write_only
) {
7075 fields
[i
].image_read_only
= false;
7076 fields
[i
].image_write_only
= true;
7078 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
7079 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
7082 /* For other qualifiers, we set the flag if either the layout
7083 * qualifier or the field qualifier are set
7085 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
7086 layout
->flags
.q
.coherent
;
7087 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
7088 layout
->flags
.q
._volatile
;
7089 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
7090 layout
->flags
.q
.restrict_flag
;
7097 assert(i
== decl_count
);
7099 *fields_ret
= fields
;
7105 ast_struct_specifier::hir(exec_list
*instructions
,
7106 struct _mesa_glsl_parse_state
*state
)
7108 YYLTYPE loc
= this->get_location();
7110 unsigned expl_location
= 0;
7111 if (layout
&& layout
->flags
.q
.explicit_location
) {
7112 if (!process_qualifier_constant(state
, &loc
, "location",
7113 layout
->location
, &expl_location
)) {
7116 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7120 glsl_struct_field
*fields
;
7121 unsigned decl_count
=
7122 ast_process_struct_or_iface_block_members(instructions
,
7124 &this->declarations
,
7127 GLSL_MATRIX_LAYOUT_INHERITED
,
7128 false /* allow_reserved_names */,
7131 0, /* for interface only */
7132 0, /* for interface only */
7133 0, /* for interface only */
7135 0 /* for interface only */);
7137 validate_identifier(this->name
, loc
, state
);
7139 const glsl_type
*t
=
7140 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7142 if (!state
->symbols
->add_type(name
, t
)) {
7143 const glsl_type
*match
= state
->symbols
->get_type(name
);
7144 /* allow struct matching for desktop GL - older UE4 does this */
7145 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
7146 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7148 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7150 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7152 state
->num_user_structures
+ 1);
7154 s
[state
->num_user_structures
] = t
;
7155 state
->user_structures
= s
;
7156 state
->num_user_structures
++;
7160 /* Structure type definitions do not have r-values.
7167 * Visitor class which detects whether a given interface block has been used.
7169 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7172 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7173 : mode(mode
), block(block
), found(false)
7177 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7179 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7183 return visit_continue
;
7186 bool usage_found() const
7192 ir_variable_mode mode
;
7193 const glsl_type
*block
;
7198 is_unsized_array_last_element(ir_variable
*v
)
7200 const glsl_type
*interface_type
= v
->get_interface_type();
7201 int length
= interface_type
->length
;
7203 assert(v
->type
->is_unsized_array());
7205 /* Check if it is the last element of the interface */
7206 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7212 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7214 var
->data
.image_read_only
= field
.image_read_only
;
7215 var
->data
.image_write_only
= field
.image_write_only
;
7216 var
->data
.image_coherent
= field
.image_coherent
;
7217 var
->data
.image_volatile
= field
.image_volatile
;
7218 var
->data
.image_restrict
= field
.image_restrict
;
7222 ast_interface_block::hir(exec_list
*instructions
,
7223 struct _mesa_glsl_parse_state
*state
)
7225 YYLTYPE loc
= this->get_location();
7227 /* Interface blocks must be declared at global scope */
7228 if (state
->current_function
!= NULL
) {
7229 _mesa_glsl_error(&loc
, state
,
7230 "Interface block `%s' must be declared "
7235 /* Validate qualifiers:
7237 * - Layout Qualifiers as per the table in Section 4.4
7238 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7240 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7243 * "Additionally, memory qualifiers may also be used in the declaration
7244 * of shader storage blocks"
7246 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7247 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7248 * Layout Qualifiers) of the GLSL 4.50 spec says:
7250 * "The std430 qualifier is supported only for shader storage blocks;
7251 * using std430 on a uniform block will result in a compile-time error."
7253 ast_type_qualifier allowed_blk_qualifiers
;
7254 allowed_blk_qualifiers
.flags
.i
= 0;
7255 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7256 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7257 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7258 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7259 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7260 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7261 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7262 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7263 if (this->layout
.flags
.q
.buffer
) {
7264 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7265 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7266 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7267 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7268 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7269 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7270 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7272 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7275 /* Interface block */
7276 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7278 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7279 if (this->layout
.flags
.q
.out
) {
7280 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7281 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7282 state
->stage
== MESA_SHADER_TESS_CTRL
||
7283 state
->stage
== MESA_SHADER_TESS_EVAL
||
7284 state
->stage
== MESA_SHADER_VERTEX
) {
7285 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7286 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7287 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7288 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7289 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7290 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7291 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7292 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7294 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7295 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7299 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7300 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7301 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7306 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7307 "invalid qualifier for block",
7310 /* The ast_interface_block has a list of ast_declarator_lists. We
7311 * need to turn those into ir_variables with an association
7312 * with this uniform block.
7314 enum glsl_interface_packing packing
;
7315 if (this->layout
.flags
.q
.shared
) {
7316 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7317 } else if (this->layout
.flags
.q
.packed
) {
7318 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7319 } else if (this->layout
.flags
.q
.std430
) {
7320 packing
= GLSL_INTERFACE_PACKING_STD430
;
7322 /* The default layout is std140.
7324 packing
= GLSL_INTERFACE_PACKING_STD140
;
7327 ir_variable_mode var_mode
;
7328 const char *iface_type_name
;
7329 if (this->layout
.flags
.q
.in
) {
7330 var_mode
= ir_var_shader_in
;
7331 iface_type_name
= "in";
7332 } else if (this->layout
.flags
.q
.out
) {
7333 var_mode
= ir_var_shader_out
;
7334 iface_type_name
= "out";
7335 } else if (this->layout
.flags
.q
.uniform
) {
7336 var_mode
= ir_var_uniform
;
7337 iface_type_name
= "uniform";
7338 } else if (this->layout
.flags
.q
.buffer
) {
7339 var_mode
= ir_var_shader_storage
;
7340 iface_type_name
= "buffer";
7342 var_mode
= ir_var_auto
;
7343 iface_type_name
= "UNKNOWN";
7344 assert(!"interface block layout qualifier not found!");
7347 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7348 if (this->layout
.flags
.q
.row_major
)
7349 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7350 else if (this->layout
.flags
.q
.column_major
)
7351 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7353 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7354 exec_list declared_variables
;
7355 glsl_struct_field
*fields
;
7357 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7358 * that we don't have incompatible qualifiers
7360 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7361 _mesa_glsl_error(&loc
, state
,
7362 "Interface block sets both readonly and writeonly");
7365 unsigned qual_stream
;
7366 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7368 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7369 /* If the stream qualifier is invalid it doesn't make sense to continue
7370 * on and try to compare stream layouts on member variables against it
7371 * so just return early.
7376 unsigned qual_xfb_buffer
;
7377 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7378 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7379 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7383 unsigned qual_xfb_offset
;
7384 if (layout
.flags
.q
.explicit_xfb_offset
) {
7385 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7386 layout
.offset
, &qual_xfb_offset
)) {
7391 unsigned qual_xfb_stride
;
7392 if (layout
.flags
.q
.explicit_xfb_stride
) {
7393 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7394 layout
.xfb_stride
, &qual_xfb_stride
)) {
7399 unsigned expl_location
= 0;
7400 if (layout
.flags
.q
.explicit_location
) {
7401 if (!process_qualifier_constant(state
, &loc
, "location",
7402 layout
.location
, &expl_location
)) {
7405 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7406 : VARYING_SLOT_VAR0
;
7410 unsigned expl_align
= 0;
7411 if (layout
.flags
.q
.explicit_align
) {
7412 if (!process_qualifier_constant(state
, &loc
, "align",
7413 layout
.align
, &expl_align
)) {
7416 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7417 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7424 unsigned int num_variables
=
7425 ast_process_struct_or_iface_block_members(&declared_variables
,
7427 &this->declarations
,
7431 redeclaring_per_vertex
,
7440 if (!redeclaring_per_vertex
) {
7441 validate_identifier(this->block_name
, loc
, state
);
7443 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7445 * "Block names have no other use within a shader beyond interface
7446 * matching; it is a compile-time error to use a block name at global
7447 * scope for anything other than as a block name."
7449 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7450 if (var
&& !var
->type
->is_interface()) {
7451 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7452 "already used in the scope.",
7457 const glsl_type
*earlier_per_vertex
= NULL
;
7458 if (redeclaring_per_vertex
) {
7459 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7460 * the named interface block gl_in, we can find it by looking at the
7461 * previous declaration of gl_in. Otherwise we can find it by looking
7462 * at the previous decalartion of any of the built-in outputs,
7465 * Also check that the instance name and array-ness of the redeclaration
7469 case ir_var_shader_in
:
7470 if (ir_variable
*earlier_gl_in
=
7471 state
->symbols
->get_variable("gl_in")) {
7472 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7474 _mesa_glsl_error(&loc
, state
,
7475 "redeclaration of gl_PerVertex input not allowed "
7477 _mesa_shader_stage_to_string(state
->stage
));
7479 if (this->instance_name
== NULL
||
7480 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7481 !this->array_specifier
->is_single_dimension()) {
7482 _mesa_glsl_error(&loc
, state
,
7483 "gl_PerVertex input must be redeclared as "
7487 case ir_var_shader_out
:
7488 if (ir_variable
*earlier_gl_Position
=
7489 state
->symbols
->get_variable("gl_Position")) {
7490 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7491 } else if (ir_variable
*earlier_gl_out
=
7492 state
->symbols
->get_variable("gl_out")) {
7493 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7495 _mesa_glsl_error(&loc
, state
,
7496 "redeclaration of gl_PerVertex output not "
7497 "allowed in the %s shader",
7498 _mesa_shader_stage_to_string(state
->stage
));
7500 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7501 if (this->instance_name
== NULL
||
7502 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7503 _mesa_glsl_error(&loc
, state
,
7504 "gl_PerVertex output must be redeclared as "
7508 if (this->instance_name
!= NULL
) {
7509 _mesa_glsl_error(&loc
, state
,
7510 "gl_PerVertex output may not be redeclared with "
7511 "an instance name");
7516 _mesa_glsl_error(&loc
, state
,
7517 "gl_PerVertex must be declared as an input or an "
7522 if (earlier_per_vertex
== NULL
) {
7523 /* An error has already been reported. Bail out to avoid null
7524 * dereferences later in this function.
7529 /* Copy locations from the old gl_PerVertex interface block. */
7530 for (unsigned i
= 0; i
< num_variables
; i
++) {
7531 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7533 _mesa_glsl_error(&loc
, state
,
7534 "redeclaration of gl_PerVertex must be a subset "
7535 "of the built-in members of gl_PerVertex");
7537 fields
[i
].location
=
7538 earlier_per_vertex
->fields
.structure
[j
].location
;
7540 earlier_per_vertex
->fields
.structure
[j
].offset
;
7541 fields
[i
].interpolation
=
7542 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7543 fields
[i
].centroid
=
7544 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7546 earlier_per_vertex
->fields
.structure
[j
].sample
;
7548 earlier_per_vertex
->fields
.structure
[j
].patch
;
7549 fields
[i
].precision
=
7550 earlier_per_vertex
->fields
.structure
[j
].precision
;
7551 fields
[i
].explicit_xfb_buffer
=
7552 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7553 fields
[i
].xfb_buffer
=
7554 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7555 fields
[i
].xfb_stride
=
7556 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7560 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7563 * If a built-in interface block is redeclared, it must appear in
7564 * the shader before any use of any member included in the built-in
7565 * declaration, or a compilation error will result.
7567 * This appears to be a clarification to the behaviour established for
7568 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7569 * regardless of GLSL version.
7571 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7572 v
.run(instructions
);
7573 if (v
.usage_found()) {
7574 _mesa_glsl_error(&loc
, state
,
7575 "redeclaration of a built-in interface block must "
7576 "appear before any use of any member of the "
7581 const glsl_type
*block_type
=
7582 glsl_type::get_interface_instance(fields
,
7586 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7589 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7591 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7592 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7595 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7596 YYLTYPE loc
= this->get_location();
7597 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7598 "already taken in the current scope",
7599 this->block_name
, iface_type_name
);
7602 /* Since interface blocks cannot contain statements, it should be
7603 * impossible for the block to generate any instructions.
7605 assert(declared_variables
.is_empty());
7607 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7609 * Geometry shader input variables get the per-vertex values written
7610 * out by vertex shader output variables of the same names. Since a
7611 * geometry shader operates on a set of vertices, each input varying
7612 * variable (or input block, see interface blocks below) needs to be
7613 * declared as an array.
7615 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7616 var_mode
== ir_var_shader_in
) {
7617 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7618 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7619 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7620 !this->layout
.flags
.q
.patch
&&
7621 this->array_specifier
== NULL
&&
7622 var_mode
== ir_var_shader_in
) {
7623 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7624 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7625 !this->layout
.flags
.q
.patch
&&
7626 this->array_specifier
== NULL
&&
7627 var_mode
== ir_var_shader_out
) {
7628 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7632 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7635 * "If an instance name (instance-name) is used, then it puts all the
7636 * members inside a scope within its own name space, accessed with the
7637 * field selector ( . ) operator (analogously to structures)."
7639 if (this->instance_name
) {
7640 if (redeclaring_per_vertex
) {
7641 /* When a built-in in an unnamed interface block is redeclared,
7642 * get_variable_being_redeclared() calls
7643 * check_builtin_array_max_size() to make sure that built-in array
7644 * variables aren't redeclared to illegal sizes. But we're looking
7645 * at a redeclaration of a named built-in interface block. So we
7646 * have to manually call check_builtin_array_max_size() for all parts
7647 * of the interface that are arrays.
7649 for (unsigned i
= 0; i
< num_variables
; i
++) {
7650 if (fields
[i
].type
->is_array()) {
7651 const unsigned size
= fields
[i
].type
->array_size();
7652 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7656 validate_identifier(this->instance_name
, loc
, state
);
7661 if (this->array_specifier
!= NULL
) {
7662 const glsl_type
*block_array_type
=
7663 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7665 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7667 * For uniform blocks declared an array, each individual array
7668 * element corresponds to a separate buffer object backing one
7669 * instance of the block. As the array size indicates the number
7670 * of buffer objects needed, uniform block array declarations
7671 * must specify an array size.
7673 * And a few paragraphs later:
7675 * Geometry shader input blocks must be declared as arrays and
7676 * follow the array declaration and linking rules for all
7677 * geometry shader inputs. All other input and output block
7678 * arrays must specify an array size.
7680 * The same applies to tessellation shaders.
7682 * The upshot of this is that the only circumstance where an
7683 * interface array size *doesn't* need to be specified is on a
7684 * geometry shader input, tessellation control shader input,
7685 * tessellation control shader output, and tessellation evaluation
7688 if (block_array_type
->is_unsized_array()) {
7689 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7690 state
->stage
== MESA_SHADER_TESS_CTRL
||
7691 state
->stage
== MESA_SHADER_TESS_EVAL
;
7692 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7694 if (this->layout
.flags
.q
.in
) {
7696 _mesa_glsl_error(&loc
, state
,
7697 "unsized input block arrays not allowed in "
7699 _mesa_shader_stage_to_string(state
->stage
));
7700 } else if (this->layout
.flags
.q
.out
) {
7702 _mesa_glsl_error(&loc
, state
,
7703 "unsized output block arrays not allowed in "
7705 _mesa_shader_stage_to_string(state
->stage
));
7707 /* by elimination, this is a uniform block array */
7708 _mesa_glsl_error(&loc
, state
,
7709 "unsized uniform block arrays not allowed in "
7711 _mesa_shader_stage_to_string(state
->stage
));
7715 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7717 * * Arrays of arrays of blocks are not allowed
7719 if (state
->es_shader
&& block_array_type
->is_array() &&
7720 block_array_type
->fields
.array
->is_array()) {
7721 _mesa_glsl_error(&loc
, state
,
7722 "arrays of arrays interface blocks are "
7726 var
= new(state
) ir_variable(block_array_type
,
7727 this->instance_name
,
7730 var
= new(state
) ir_variable(block_type
,
7731 this->instance_name
,
7735 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7736 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7738 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7739 var
->data
.read_only
= true;
7741 var
->data
.patch
= this->layout
.flags
.q
.patch
;
7743 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7744 handle_geometry_shader_input_decl(state
, loc
, var
);
7745 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7746 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7747 handle_tess_shader_input_decl(state
, loc
, var
);
7748 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7749 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7751 for (unsigned i
= 0; i
< num_variables
; i
++) {
7752 if (var
->data
.mode
== ir_var_shader_storage
)
7753 apply_memory_qualifiers(var
, fields
[i
]);
7756 if (ir_variable
*earlier
=
7757 state
->symbols
->get_variable(this->instance_name
)) {
7758 if (!redeclaring_per_vertex
) {
7759 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7760 this->instance_name
);
7762 earlier
->data
.how_declared
= ir_var_declared_normally
;
7763 earlier
->type
= var
->type
;
7764 earlier
->reinit_interface_type(block_type
);
7767 if (this->layout
.flags
.q
.explicit_binding
) {
7768 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7772 var
->data
.stream
= qual_stream
;
7773 if (layout
.flags
.q
.explicit_location
) {
7774 var
->data
.location
= expl_location
;
7775 var
->data
.explicit_location
= true;
7778 state
->symbols
->add_variable(var
);
7779 instructions
->push_tail(var
);
7782 /* In order to have an array size, the block must also be declared with
7785 assert(this->array_specifier
== NULL
);
7787 for (unsigned i
= 0; i
< num_variables
; i
++) {
7789 new(state
) ir_variable(fields
[i
].type
,
7790 ralloc_strdup(state
, fields
[i
].name
),
7792 var
->data
.interpolation
= fields
[i
].interpolation
;
7793 var
->data
.centroid
= fields
[i
].centroid
;
7794 var
->data
.sample
= fields
[i
].sample
;
7795 var
->data
.patch
= fields
[i
].patch
;
7796 var
->data
.stream
= qual_stream
;
7797 var
->data
.location
= fields
[i
].location
;
7799 if (fields
[i
].location
!= -1)
7800 var
->data
.explicit_location
= true;
7802 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7803 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7805 if (fields
[i
].offset
!= -1)
7806 var
->data
.explicit_xfb_offset
= true;
7807 var
->data
.offset
= fields
[i
].offset
;
7809 var
->init_interface_type(block_type
);
7811 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7812 var
->data
.read_only
= true;
7814 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7815 if (state
->es_shader
) {
7816 var
->data
.precision
=
7817 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7821 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7822 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7823 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7825 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7828 if (var
->data
.mode
== ir_var_shader_storage
)
7829 apply_memory_qualifiers(var
, fields
[i
]);
7831 /* Examine var name here since var may get deleted in the next call */
7832 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7834 if (redeclaring_per_vertex
) {
7835 ir_variable
*earlier
=
7836 get_variable_being_redeclared(var
, loc
, state
,
7837 true /* allow_all_redeclarations */);
7838 if (!var_is_gl_id
|| earlier
== NULL
) {
7839 _mesa_glsl_error(&loc
, state
,
7840 "redeclaration of gl_PerVertex can only "
7841 "include built-in variables");
7842 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7843 _mesa_glsl_error(&loc
, state
,
7844 "`%s' has already been redeclared",
7847 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7848 earlier
->reinit_interface_type(block_type
);
7853 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7854 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7856 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7857 * The UBO declaration itself doesn't get an ir_variable unless it
7858 * has an instance name. This is ugly.
7860 if (this->layout
.flags
.q
.explicit_binding
) {
7861 apply_explicit_binding(state
, &loc
, var
,
7862 var
->get_interface_type(), &this->layout
);
7865 if (var
->type
->is_unsized_array()) {
7866 if (var
->is_in_shader_storage_block()) {
7867 if (is_unsized_array_last_element(var
)) {
7868 var
->data
.from_ssbo_unsized_array
= true;
7871 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7873 * "If an array is declared as the last member of a shader storage
7874 * block and the size is not specified at compile-time, it is
7875 * sized at run-time. In all other cases, arrays are sized only
7878 if (state
->es_shader
) {
7879 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
7880 "definition: only last member of a shader "
7881 "storage block can be defined as unsized "
7882 "array", fields
[i
].name
);
7887 state
->symbols
->add_variable(var
);
7888 instructions
->push_tail(var
);
7891 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7892 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7894 * It is also a compilation error ... to redeclare a built-in
7895 * block and then use a member from that built-in block that was
7896 * not included in the redeclaration.
7898 * This appears to be a clarification to the behaviour established
7899 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7900 * behaviour regardless of GLSL version.
7902 * To prevent the shader from using a member that was not included in
7903 * the redeclaration, we disable any ir_variables that are still
7904 * associated with the old declaration of gl_PerVertex (since we've
7905 * already updated all of the variables contained in the new
7906 * gl_PerVertex to point to it).
7908 * As a side effect this will prevent
7909 * validate_intrastage_interface_blocks() from getting confused and
7910 * thinking there are conflicting definitions of gl_PerVertex in the
7913 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7914 ir_variable
*const var
= node
->as_variable();
7916 var
->get_interface_type() == earlier_per_vertex
&&
7917 var
->data
.mode
== var_mode
) {
7918 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7919 _mesa_glsl_error(&loc
, state
,
7920 "redeclaration of gl_PerVertex cannot "
7921 "follow a redeclaration of `%s'",
7924 state
->symbols
->disable_variable(var
->name
);
7936 ast_tcs_output_layout::hir(exec_list
*instructions
,
7937 struct _mesa_glsl_parse_state
*state
)
7939 YYLTYPE loc
= this->get_location();
7941 unsigned num_vertices
;
7942 if (!state
->out_qualifier
->vertices
->
7943 process_qualifier_constant(state
, "vertices", &num_vertices
,
7945 /* return here to stop cascading incorrect error messages */
7949 /* If any shader outputs occurred before this declaration and specified an
7950 * array size, make sure the size they specified is consistent with the
7953 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7954 _mesa_glsl_error(&loc
, state
,
7955 "this tessellation control shader output layout "
7956 "specifies %u vertices, but a previous output "
7957 "is declared with size %u",
7958 num_vertices
, state
->tcs_output_size
);
7962 state
->tcs_output_vertices_specified
= true;
7964 /* If any shader outputs occurred before this declaration and did not
7965 * specify an array size, their size is determined now.
7967 foreach_in_list (ir_instruction
, node
, instructions
) {
7968 ir_variable
*var
= node
->as_variable();
7969 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7972 /* Note: Not all tessellation control shader output are arrays. */
7973 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7976 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7977 _mesa_glsl_error(&loc
, state
,
7978 "this tessellation control shader output layout "
7979 "specifies %u vertices, but an access to element "
7980 "%u of output `%s' already exists", num_vertices
,
7981 var
->data
.max_array_access
, var
->name
);
7983 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7993 ast_gs_input_layout::hir(exec_list
*instructions
,
7994 struct _mesa_glsl_parse_state
*state
)
7996 YYLTYPE loc
= this->get_location();
7998 /* Should have been prevented by the parser. */
7999 assert(!state
->gs_input_prim_type_specified
8000 || state
->in_qualifier
->prim_type
== this->prim_type
);
8002 /* If any shader inputs occurred before this declaration and specified an
8003 * array size, make sure the size they specified is consistent with the
8006 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8007 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8008 _mesa_glsl_error(&loc
, state
,
8009 "this geometry shader input layout implies %u vertices"
8010 " per primitive, but a previous input is declared"
8011 " with size %u", num_vertices
, state
->gs_input_size
);
8015 state
->gs_input_prim_type_specified
= true;
8017 /* If any shader inputs occurred before this declaration and did not
8018 * specify an array size, their size is determined now.
8020 foreach_in_list(ir_instruction
, node
, instructions
) {
8021 ir_variable
*var
= node
->as_variable();
8022 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8025 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8029 if (var
->type
->is_unsized_array()) {
8030 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8031 _mesa_glsl_error(&loc
, state
,
8032 "this geometry shader input layout implies %u"
8033 " vertices, but an access to element %u of input"
8034 " `%s' already exists", num_vertices
,
8035 var
->data
.max_array_access
, var
->name
);
8037 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8048 ast_cs_input_layout::hir(exec_list
*instructions
,
8049 struct _mesa_glsl_parse_state
*state
)
8051 YYLTYPE loc
= this->get_location();
8053 /* From the ARB_compute_shader specification:
8055 * If the local size of the shader in any dimension is greater
8056 * than the maximum size supported by the implementation for that
8057 * dimension, a compile-time error results.
8059 * It is not clear from the spec how the error should be reported if
8060 * the total size of the work group exceeds
8061 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8062 * report it at compile time as well.
8064 GLuint64 total_invocations
= 1;
8065 unsigned qual_local_size
[3];
8066 for (int i
= 0; i
< 3; i
++) {
8068 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8070 /* Infer a local_size of 1 for unspecified dimensions */
8071 if (this->local_size
[i
] == NULL
) {
8072 qual_local_size
[i
] = 1;
8073 } else if (!this->local_size
[i
]->
8074 process_qualifier_constant(state
, local_size_str
,
8075 &qual_local_size
[i
], false)) {
8076 ralloc_free(local_size_str
);
8079 ralloc_free(local_size_str
);
8081 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8082 _mesa_glsl_error(&loc
, state
,
8083 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8085 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8088 total_invocations
*= qual_local_size
[i
];
8089 if (total_invocations
>
8090 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8091 _mesa_glsl_error(&loc
, state
,
8092 "product of local_sizes exceeds "
8093 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8094 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8099 /* If any compute input layout declaration preceded this one, make sure it
8100 * was consistent with this one.
8102 if (state
->cs_input_local_size_specified
) {
8103 for (int i
= 0; i
< 3; i
++) {
8104 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8105 _mesa_glsl_error(&loc
, state
,
8106 "compute shader input layout does not match"
8107 " previous declaration");
8113 /* The ARB_compute_variable_group_size spec says:
8115 * If a compute shader including a *local_size_variable* qualifier also
8116 * declares a fixed local group size using the *local_size_x*,
8117 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8120 if (state
->cs_input_local_size_variable_specified
) {
8121 _mesa_glsl_error(&loc
, state
,
8122 "compute shader can't include both a variable and a "
8123 "fixed local group size");
8127 state
->cs_input_local_size_specified
= true;
8128 for (int i
= 0; i
< 3; i
++)
8129 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8131 /* We may now declare the built-in constant gl_WorkGroupSize (see
8132 * builtin_variable_generator::generate_constants() for why we didn't
8133 * declare it earlier).
8135 ir_variable
*var
= new(state
->symbols
)
8136 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8137 var
->data
.how_declared
= ir_var_declared_implicitly
;
8138 var
->data
.read_only
= true;
8139 instructions
->push_tail(var
);
8140 state
->symbols
->add_variable(var
);
8141 ir_constant_data data
;
8142 memset(&data
, 0, sizeof(data
));
8143 for (int i
= 0; i
< 3; i
++)
8144 data
.u
[i
] = qual_local_size
[i
];
8145 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8146 var
->constant_initializer
=
8147 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8148 var
->data
.has_initializer
= true;
8155 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8156 exec_list
*instructions
)
8158 bool gl_FragColor_assigned
= false;
8159 bool gl_FragData_assigned
= false;
8160 bool gl_FragSecondaryColor_assigned
= false;
8161 bool gl_FragSecondaryData_assigned
= false;
8162 bool user_defined_fs_output_assigned
= false;
8163 ir_variable
*user_defined_fs_output
= NULL
;
8165 /* It would be nice to have proper location information. */
8167 memset(&loc
, 0, sizeof(loc
));
8169 foreach_in_list(ir_instruction
, node
, instructions
) {
8170 ir_variable
*var
= node
->as_variable();
8172 if (!var
|| !var
->data
.assigned
)
8175 if (strcmp(var
->name
, "gl_FragColor") == 0)
8176 gl_FragColor_assigned
= true;
8177 else if (strcmp(var
->name
, "gl_FragData") == 0)
8178 gl_FragData_assigned
= true;
8179 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8180 gl_FragSecondaryColor_assigned
= true;
8181 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8182 gl_FragSecondaryData_assigned
= true;
8183 else if (!is_gl_identifier(var
->name
)) {
8184 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8185 var
->data
.mode
== ir_var_shader_out
) {
8186 user_defined_fs_output_assigned
= true;
8187 user_defined_fs_output
= var
;
8192 /* From the GLSL 1.30 spec:
8194 * "If a shader statically assigns a value to gl_FragColor, it
8195 * may not assign a value to any element of gl_FragData. If a
8196 * shader statically writes a value to any element of
8197 * gl_FragData, it may not assign a value to
8198 * gl_FragColor. That is, a shader may assign values to either
8199 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8200 * linked together must also consistently write just one of
8201 * these variables. Similarly, if user declared output
8202 * variables are in use (statically assigned to), then the
8203 * built-in variables gl_FragColor and gl_FragData may not be
8204 * assigned to. These incorrect usages all generate compile
8207 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8208 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8209 "`gl_FragColor' and `gl_FragData'");
8210 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8211 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8212 "`gl_FragColor' and `%s'",
8213 user_defined_fs_output
->name
);
8214 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8215 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8216 "`gl_FragSecondaryColorEXT' and"
8217 " `gl_FragSecondaryDataEXT'");
8218 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8219 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8220 "`gl_FragColor' and"
8221 " `gl_FragSecondaryDataEXT'");
8222 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8223 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8225 " `gl_FragSecondaryColorEXT'");
8226 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8227 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8228 "`gl_FragData' and `%s'",
8229 user_defined_fs_output
->name
);
8232 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8233 !state
->EXT_blend_func_extended_enable
) {
8234 _mesa_glsl_error(&loc
, state
,
8235 "Dual source blending requires EXT_blend_func_extended");
8241 remove_per_vertex_blocks(exec_list
*instructions
,
8242 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8244 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8245 * if it exists in this shader type.
8247 const glsl_type
*per_vertex
= NULL
;
8249 case ir_var_shader_in
:
8250 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8251 per_vertex
= gl_in
->get_interface_type();
8253 case ir_var_shader_out
:
8254 if (ir_variable
*gl_Position
=
8255 state
->symbols
->get_variable("gl_Position")) {
8256 per_vertex
= gl_Position
->get_interface_type();
8260 assert(!"Unexpected mode");
8264 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8265 * need to do anything.
8267 if (per_vertex
== NULL
)
8270 /* If the interface block is used by the shader, then we don't need to do
8273 interface_block_usage_visitor
v(mode
, per_vertex
);
8274 v
.run(instructions
);
8275 if (v
.usage_found())
8278 /* Remove any ir_variable declarations that refer to the interface block
8281 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8282 ir_variable
*const var
= node
->as_variable();
8283 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8284 var
->data
.mode
== mode
) {
8285 state
->symbols
->disable_variable(var
->name
);