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 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1098 case GLSL_TYPE_ARRAY
: {
1099 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1100 ir_rvalue
*e0
, *e1
, *result
;
1102 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1103 new(mem_ctx
) ir_constant(i
));
1104 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1105 new(mem_ctx
) ir_constant(i
));
1106 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1109 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1115 mark_whole_array_access(op0
);
1116 mark_whole_array_access(op1
);
1120 case GLSL_TYPE_STRUCT
: {
1121 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1122 ir_rvalue
*e0
, *e1
, *result
;
1123 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1125 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1127 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1129 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1132 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1140 case GLSL_TYPE_ERROR
:
1141 case GLSL_TYPE_VOID
:
1142 case GLSL_TYPE_SAMPLER
:
1143 case GLSL_TYPE_IMAGE
:
1144 case GLSL_TYPE_INTERFACE
:
1145 case GLSL_TYPE_ATOMIC_UINT
:
1146 case GLSL_TYPE_SUBROUTINE
:
1147 case GLSL_TYPE_FUNCTION
:
1148 /* I assume a comparison of a struct containing a sampler just
1149 * ignores the sampler present in the type.
1155 cmp
= new(mem_ctx
) ir_constant(true);
1160 /* For logical operations, we want to ensure that the operands are
1161 * scalar booleans. If it isn't, emit an error and return a constant
1162 * boolean to avoid triggering cascading error messages.
1165 get_scalar_boolean_operand(exec_list
*instructions
,
1166 struct _mesa_glsl_parse_state
*state
,
1167 ast_expression
*parent_expr
,
1169 const char *operand_name
,
1170 bool *error_emitted
)
1172 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1174 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1176 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1179 if (!*error_emitted
) {
1180 YYLTYPE loc
= expr
->get_location();
1181 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1183 parent_expr
->operator_string(parent_expr
->oper
));
1184 *error_emitted
= true;
1187 return new(ctx
) ir_constant(true);
1191 * If name refers to a builtin array whose maximum allowed size is less than
1192 * size, report an error and return true. Otherwise return false.
1195 check_builtin_array_max_size(const char *name
, unsigned size
,
1196 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1198 if ((strcmp("gl_TexCoord", name
) == 0)
1199 && (size
> state
->Const
.MaxTextureCoords
)) {
1200 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1202 * "The size [of gl_TexCoord] can be at most
1203 * gl_MaxTextureCoords."
1205 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1206 "be larger than gl_MaxTextureCoords (%u)",
1207 state
->Const
.MaxTextureCoords
);
1208 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1209 state
->clip_dist_size
= size
;
1210 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1211 /* From section 7.1 (Vertex Shader Special Variables) of the
1214 * "The gl_ClipDistance array is predeclared as unsized and
1215 * must be sized by the shader either redeclaring it with a
1216 * size or indexing it only with integral constant
1217 * expressions. ... The size can be at most
1218 * gl_MaxClipDistances."
1220 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1221 "be larger than gl_MaxClipDistances (%u)",
1222 state
->Const
.MaxClipPlanes
);
1224 } else if (strcmp("gl_CullDistance", name
) == 0) {
1225 state
->cull_dist_size
= size
;
1226 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1227 /* From the ARB_cull_distance spec:
1229 * "The gl_CullDistance array is predeclared as unsized and
1230 * must be sized by the shader either redeclaring it with
1231 * a size or indexing it only with integral constant
1232 * expressions. The size determines the number and set of
1233 * enabled cull distances and can be at most
1234 * gl_MaxCullDistances."
1236 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1237 "be larger than gl_MaxCullDistances (%u)",
1238 state
->Const
.MaxClipPlanes
);
1244 * Create the constant 1, of a which is appropriate for incrementing and
1245 * decrementing values of the given GLSL type. For example, if type is vec4,
1246 * this creates a constant value of 1.0 having type float.
1248 * If the given type is invalid for increment and decrement operators, return
1249 * a floating point 1--the error will be detected later.
1252 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1254 switch (type
->base_type
) {
1255 case GLSL_TYPE_UINT
:
1256 return new(ctx
) ir_constant((unsigned) 1);
1258 return new(ctx
) ir_constant(1);
1260 case GLSL_TYPE_FLOAT
:
1261 return new(ctx
) ir_constant(1.0f
);
1266 ast_expression::hir(exec_list
*instructions
,
1267 struct _mesa_glsl_parse_state
*state
)
1269 return do_hir(instructions
, state
, true);
1273 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1274 struct _mesa_glsl_parse_state
*state
)
1276 do_hir(instructions
, state
, false);
1280 ast_expression::set_is_lhs(bool new_value
)
1282 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1283 * if we lack an identifier we can just skip it.
1285 if (this->primary_expression
.identifier
== NULL
)
1288 this->is_lhs
= new_value
;
1290 /* We need to go through the subexpressions tree to cover cases like
1291 * ast_field_selection
1293 if (this->subexpressions
[0] != NULL
)
1294 this->subexpressions
[0]->set_is_lhs(new_value
);
1298 ast_expression::do_hir(exec_list
*instructions
,
1299 struct _mesa_glsl_parse_state
*state
,
1303 static const int operations
[AST_NUM_OPERATORS
] = {
1304 -1, /* ast_assign doesn't convert to ir_expression. */
1305 -1, /* ast_plus doesn't convert to ir_expression. */
1319 ir_binop_any_nequal
,
1329 /* Note: The following block of expression types actually convert
1330 * to multiple IR instructions.
1332 ir_binop_mul
, /* ast_mul_assign */
1333 ir_binop_div
, /* ast_div_assign */
1334 ir_binop_mod
, /* ast_mod_assign */
1335 ir_binop_add
, /* ast_add_assign */
1336 ir_binop_sub
, /* ast_sub_assign */
1337 ir_binop_lshift
, /* ast_ls_assign */
1338 ir_binop_rshift
, /* ast_rs_assign */
1339 ir_binop_bit_and
, /* ast_and_assign */
1340 ir_binop_bit_xor
, /* ast_xor_assign */
1341 ir_binop_bit_or
, /* ast_or_assign */
1343 -1, /* ast_conditional doesn't convert to ir_expression. */
1344 ir_binop_add
, /* ast_pre_inc. */
1345 ir_binop_sub
, /* ast_pre_dec. */
1346 ir_binop_add
, /* ast_post_inc. */
1347 ir_binop_sub
, /* ast_post_dec. */
1348 -1, /* ast_field_selection doesn't conv to ir_expression. */
1349 -1, /* ast_array_index doesn't convert to ir_expression. */
1350 -1, /* ast_function_call doesn't conv to ir_expression. */
1351 -1, /* ast_identifier doesn't convert to ir_expression. */
1352 -1, /* ast_int_constant doesn't convert to ir_expression. */
1353 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1354 -1, /* ast_float_constant doesn't conv to ir_expression. */
1355 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1356 -1, /* ast_sequence doesn't convert to ir_expression. */
1357 -1, /* ast_aggregate shouldn't ever even get here. */
1359 ir_rvalue
*result
= NULL
;
1361 const struct glsl_type
*type
, *orig_type
;
1362 bool error_emitted
= false;
1365 loc
= this->get_location();
1367 switch (this->oper
) {
1369 assert(!"ast_aggregate: Should never get here.");
1373 this->subexpressions
[0]->set_is_lhs(true);
1374 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1375 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1378 do_assignment(instructions
, state
,
1379 this->subexpressions
[0]->non_lvalue_description
,
1380 op
[0], op
[1], &result
, needs_rvalue
, false,
1381 this->subexpressions
[0]->get_location());
1386 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1388 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1390 error_emitted
= type
->is_error();
1396 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1398 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1400 error_emitted
= type
->is_error();
1402 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1410 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1411 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1413 type
= arithmetic_result_type(op
[0], op
[1],
1414 (this->oper
== ast_mul
),
1416 error_emitted
= type
->is_error();
1418 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1423 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1424 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1426 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1428 assert(operations
[this->oper
] == ir_binop_mod
);
1430 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1432 error_emitted
= type
->is_error();
1437 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1438 error_emitted
= true;
1441 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1442 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1443 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1445 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1447 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1454 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1455 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1457 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1459 /* The relational operators must either generate an error or result
1460 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1462 assert(type
->is_error()
1463 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1464 && type
->is_scalar()));
1466 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1468 error_emitted
= type
->is_error();
1473 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1474 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1476 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1478 * "The equality operators equal (==), and not equal (!=)
1479 * operate on all types. They result in a scalar Boolean. If
1480 * the operand types do not match, then there must be a
1481 * conversion from Section 4.1.10 "Implicit Conversions"
1482 * applied to one operand that can make them match, in which
1483 * case this conversion is done."
1486 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1487 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1488 "no operation `%1$s' exists that takes a left-hand "
1489 "operand of type 'void' or a right operand of type "
1490 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1491 error_emitted
= true;
1492 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1493 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1494 || (op
[0]->type
!= op
[1]->type
)) {
1495 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1496 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1497 error_emitted
= true;
1498 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1499 !state
->check_version(120, 300, &loc
,
1500 "array comparisons forbidden")) {
1501 error_emitted
= true;
1502 } else if ((op
[0]->type
->contains_subroutine() ||
1503 op
[1]->type
->contains_subroutine())) {
1504 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1505 error_emitted
= true;
1506 } else if ((op
[0]->type
->contains_opaque() ||
1507 op
[1]->type
->contains_opaque())) {
1508 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1509 error_emitted
= true;
1512 if (error_emitted
) {
1513 result
= new(ctx
) ir_constant(false);
1515 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1516 assert(result
->type
== glsl_type::bool_type
);
1523 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1524 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1525 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1526 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1528 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1532 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1534 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1535 error_emitted
= true;
1538 if (!op
[0]->type
->is_integer()) {
1539 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1540 error_emitted
= true;
1543 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1544 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1547 case ast_logic_and
: {
1548 exec_list rhs_instructions
;
1549 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1550 "LHS", &error_emitted
);
1551 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1552 "RHS", &error_emitted
);
1554 if (rhs_instructions
.is_empty()) {
1555 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1556 type
= result
->type
;
1558 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1561 instructions
->push_tail(tmp
);
1563 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1564 instructions
->push_tail(stmt
);
1566 stmt
->then_instructions
.append_list(&rhs_instructions
);
1567 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1568 ir_assignment
*const then_assign
=
1569 new(ctx
) ir_assignment(then_deref
, op
[1]);
1570 stmt
->then_instructions
.push_tail(then_assign
);
1572 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1573 ir_assignment
*const else_assign
=
1574 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1575 stmt
->else_instructions
.push_tail(else_assign
);
1577 result
= new(ctx
) ir_dereference_variable(tmp
);
1583 case ast_logic_or
: {
1584 exec_list rhs_instructions
;
1585 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1586 "LHS", &error_emitted
);
1587 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1588 "RHS", &error_emitted
);
1590 if (rhs_instructions
.is_empty()) {
1591 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1592 type
= result
->type
;
1594 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1597 instructions
->push_tail(tmp
);
1599 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1600 instructions
->push_tail(stmt
);
1602 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1603 ir_assignment
*const then_assign
=
1604 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1605 stmt
->then_instructions
.push_tail(then_assign
);
1607 stmt
->else_instructions
.append_list(&rhs_instructions
);
1608 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1609 ir_assignment
*const else_assign
=
1610 new(ctx
) ir_assignment(else_deref
, op
[1]);
1611 stmt
->else_instructions
.push_tail(else_assign
);
1613 result
= new(ctx
) ir_dereference_variable(tmp
);
1620 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1622 * "The logical binary operators and (&&), or ( | | ), and
1623 * exclusive or (^^). They operate only on two Boolean
1624 * expressions and result in a Boolean expression."
1626 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1628 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1631 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1636 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1637 "operand", &error_emitted
);
1639 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1643 case ast_mul_assign
:
1644 case ast_div_assign
:
1645 case ast_add_assign
:
1646 case ast_sub_assign
: {
1647 this->subexpressions
[0]->set_is_lhs(true);
1648 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1649 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1651 orig_type
= op
[0]->type
;
1652 type
= arithmetic_result_type(op
[0], op
[1],
1653 (this->oper
== ast_mul_assign
),
1656 if (type
!= orig_type
) {
1657 _mesa_glsl_error(& loc
, state
,
1658 "could not implicitly convert "
1659 "%s to %s", type
->name
, orig_type
->name
);
1660 type
= glsl_type::error_type
;
1663 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1667 do_assignment(instructions
, state
,
1668 this->subexpressions
[0]->non_lvalue_description
,
1669 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1670 &result
, needs_rvalue
, false,
1671 this->subexpressions
[0]->get_location());
1673 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1674 * explicitly test for this because none of the binary expression
1675 * operators allow array operands either.
1681 case ast_mod_assign
: {
1682 this->subexpressions
[0]->set_is_lhs(true);
1683 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1684 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1686 orig_type
= op
[0]->type
;
1687 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1689 if (type
!= orig_type
) {
1690 _mesa_glsl_error(& loc
, state
,
1691 "could not implicitly convert "
1692 "%s to %s", type
->name
, orig_type
->name
);
1693 type
= glsl_type::error_type
;
1696 assert(operations
[this->oper
] == ir_binop_mod
);
1698 ir_rvalue
*temp_rhs
;
1699 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1703 do_assignment(instructions
, state
,
1704 this->subexpressions
[0]->non_lvalue_description
,
1705 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1706 &result
, needs_rvalue
, false,
1707 this->subexpressions
[0]->get_location());
1712 case ast_rs_assign
: {
1713 this->subexpressions
[0]->set_is_lhs(true);
1714 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1715 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1716 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1718 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1719 type
, op
[0], op
[1]);
1721 do_assignment(instructions
, state
,
1722 this->subexpressions
[0]->non_lvalue_description
,
1723 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1724 &result
, needs_rvalue
, false,
1725 this->subexpressions
[0]->get_location());
1729 case ast_and_assign
:
1730 case ast_xor_assign
:
1731 case ast_or_assign
: {
1732 this->subexpressions
[0]->set_is_lhs(true);
1733 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1734 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1736 orig_type
= op
[0]->type
;
1737 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1739 if (type
!= orig_type
) {
1740 _mesa_glsl_error(& loc
, state
,
1741 "could not implicitly convert "
1742 "%s to %s", type
->name
, orig_type
->name
);
1743 type
= glsl_type::error_type
;
1746 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1747 type
, op
[0], op
[1]);
1749 do_assignment(instructions
, state
,
1750 this->subexpressions
[0]->non_lvalue_description
,
1751 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1752 &result
, needs_rvalue
, false,
1753 this->subexpressions
[0]->get_location());
1757 case ast_conditional
: {
1758 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1760 * "The ternary selection operator (?:). It operates on three
1761 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1762 * first expression, which must result in a scalar Boolean."
1764 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1765 "condition", &error_emitted
);
1767 /* The :? operator is implemented by generating an anonymous temporary
1768 * followed by an if-statement. The last instruction in each branch of
1769 * the if-statement assigns a value to the anonymous temporary. This
1770 * temporary is the r-value of the expression.
1772 exec_list then_instructions
;
1773 exec_list else_instructions
;
1775 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1776 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1778 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1780 * "The second and third expressions can be any type, as
1781 * long their types match, or there is a conversion in
1782 * Section 4.1.10 "Implicit Conversions" that can be applied
1783 * to one of the expressions to make their types match. This
1784 * resulting matching type is the type of the entire
1787 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1788 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1789 || (op
[1]->type
!= op
[2]->type
)) {
1790 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1792 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1793 "operator must have matching types");
1794 error_emitted
= true;
1795 type
= glsl_type::error_type
;
1800 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1802 * "The second and third expressions must be the same type, but can
1803 * be of any type other than an array."
1805 if (type
->is_array() &&
1806 !state
->check_version(120, 300, &loc
,
1807 "second and third operands of ?: operator "
1808 "cannot be arrays")) {
1809 error_emitted
= true;
1812 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1814 * "Except for array indexing, structure member selection, and
1815 * parentheses, opaque variables are not allowed to be operands in
1816 * expressions; such use results in a compile-time error."
1818 if (type
->contains_opaque()) {
1819 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1820 "of the ?: operator");
1821 error_emitted
= true;
1824 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1826 if (then_instructions
.is_empty()
1827 && else_instructions
.is_empty()
1828 && cond_val
!= NULL
) {
1829 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1831 /* The copy to conditional_tmp reads the whole array. */
1832 if (type
->is_array()) {
1833 mark_whole_array_access(op
[1]);
1834 mark_whole_array_access(op
[2]);
1837 ir_variable
*const tmp
=
1838 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1839 instructions
->push_tail(tmp
);
1841 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1842 instructions
->push_tail(stmt
);
1844 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1845 ir_dereference
*const then_deref
=
1846 new(ctx
) ir_dereference_variable(tmp
);
1847 ir_assignment
*const then_assign
=
1848 new(ctx
) ir_assignment(then_deref
, op
[1]);
1849 stmt
->then_instructions
.push_tail(then_assign
);
1851 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1852 ir_dereference
*const else_deref
=
1853 new(ctx
) ir_dereference_variable(tmp
);
1854 ir_assignment
*const else_assign
=
1855 new(ctx
) ir_assignment(else_deref
, op
[2]);
1856 stmt
->else_instructions
.push_tail(else_assign
);
1858 result
= new(ctx
) ir_dereference_variable(tmp
);
1865 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1866 ? "pre-increment operation" : "pre-decrement operation";
1868 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1869 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1871 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1873 ir_rvalue
*temp_rhs
;
1874 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1878 do_assignment(instructions
, state
,
1879 this->subexpressions
[0]->non_lvalue_description
,
1880 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1881 &result
, needs_rvalue
, false,
1882 this->subexpressions
[0]->get_location());
1887 case ast_post_dec
: {
1888 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1889 ? "post-increment operation" : "post-decrement operation";
1890 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1891 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1893 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1895 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1897 ir_rvalue
*temp_rhs
;
1898 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1901 /* Get a temporary of a copy of the lvalue before it's modified.
1902 * This may get thrown away later.
1904 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1906 ir_rvalue
*junk_rvalue
;
1908 do_assignment(instructions
, state
,
1909 this->subexpressions
[0]->non_lvalue_description
,
1910 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1911 &junk_rvalue
, false, false,
1912 this->subexpressions
[0]->get_location());
1917 case ast_field_selection
:
1918 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1921 case ast_array_index
: {
1922 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1924 /* Getting if an array is being used uninitialized is beyond what we get
1925 * from ir_value.data.assigned. Setting is_lhs as true would force to
1926 * not raise a uninitialized warning when using an array
1928 subexpressions
[0]->set_is_lhs(true);
1929 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1930 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1932 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1935 if (result
->type
->is_error())
1936 error_emitted
= true;
1941 case ast_unsized_array_dim
:
1942 assert(!"ast_unsized_array_dim: Should never get here.");
1945 case ast_function_call
:
1946 /* Should *NEVER* get here. ast_function_call should always be handled
1947 * by ast_function_expression::hir.
1952 case ast_identifier
: {
1953 /* ast_identifier can appear several places in a full abstract syntax
1954 * tree. This particular use must be at location specified in the grammar
1955 * as 'variable_identifier'.
1958 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1961 /* the identifier might be a subroutine name */
1963 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
1964 var
= state
->symbols
->get_variable(sub_name
);
1965 ralloc_free(sub_name
);
1969 var
->data
.used
= true;
1970 result
= new(ctx
) ir_dereference_variable(var
);
1972 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
1974 && result
->variable_referenced()->data
.assigned
!= true
1975 && !is_gl_identifier(var
->name
)) {
1976 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
1977 this->primary_expression
.identifier
);
1980 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1981 this->primary_expression
.identifier
);
1983 result
= ir_rvalue::error_value(ctx
);
1984 error_emitted
= true;
1989 case ast_int_constant
:
1990 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1993 case ast_uint_constant
:
1994 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1997 case ast_float_constant
:
1998 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
2001 case ast_bool_constant
:
2002 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2005 case ast_double_constant
:
2006 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2009 case ast_sequence
: {
2010 /* It should not be possible to generate a sequence in the AST without
2011 * any expressions in it.
2013 assert(!this->expressions
.is_empty());
2015 /* The r-value of a sequence is the last expression in the sequence. If
2016 * the other expressions in the sequence do not have side-effects (and
2017 * therefore add instructions to the instruction list), they get dropped
2020 exec_node
*previous_tail
= NULL
;
2021 YYLTYPE previous_operand_loc
= loc
;
2023 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2024 /* If one of the operands of comma operator does not generate any
2025 * code, we want to emit a warning. At each pass through the loop
2026 * previous_tail will point to the last instruction in the stream
2027 * *before* processing the previous operand. Naturally,
2028 * instructions->get_tail_raw() will point to the last instruction in
2029 * the stream *after* processing the previous operand. If the two
2030 * pointers match, then the previous operand had no effect.
2032 * The warning behavior here differs slightly from GCC. GCC will
2033 * only emit a warning if none of the left-hand operands have an
2034 * effect. However, it will emit a warning for each. I believe that
2035 * there are some cases in C (especially with GCC extensions) where
2036 * it is useful to have an intermediate step in a sequence have no
2037 * effect, but I don't think these cases exist in GLSL. Either way,
2038 * it would be a giant hassle to replicate that behavior.
2040 if (previous_tail
== instructions
->get_tail_raw()) {
2041 _mesa_glsl_warning(&previous_operand_loc
, state
,
2042 "left-hand operand of comma expression has "
2046 /* The tail is directly accessed instead of using the get_tail()
2047 * method for performance reasons. get_tail() has extra code to
2048 * return NULL when the list is empty. We don't care about that
2049 * here, so using get_tail_raw() is fine.
2051 previous_tail
= instructions
->get_tail_raw();
2052 previous_operand_loc
= ast
->get_location();
2054 result
= ast
->hir(instructions
, state
);
2057 /* Any errors should have already been emitted in the loop above.
2059 error_emitted
= true;
2063 type
= NULL
; /* use result->type, not type. */
2064 assert(result
!= NULL
|| !needs_rvalue
);
2066 if (result
&& result
->type
->is_error() && !error_emitted
)
2067 _mesa_glsl_error(& loc
, state
, "type mismatch");
2073 ast_expression::has_sequence_subexpression() const
2075 switch (this->oper
) {
2084 return this->subexpressions
[0]->has_sequence_subexpression();
2106 case ast_array_index
:
2107 case ast_mul_assign
:
2108 case ast_div_assign
:
2109 case ast_add_assign
:
2110 case ast_sub_assign
:
2111 case ast_mod_assign
:
2114 case ast_and_assign
:
2115 case ast_xor_assign
:
2117 return this->subexpressions
[0]->has_sequence_subexpression() ||
2118 this->subexpressions
[1]->has_sequence_subexpression();
2120 case ast_conditional
:
2121 return this->subexpressions
[0]->has_sequence_subexpression() ||
2122 this->subexpressions
[1]->has_sequence_subexpression() ||
2123 this->subexpressions
[2]->has_sequence_subexpression();
2128 case ast_field_selection
:
2129 case ast_identifier
:
2130 case ast_int_constant
:
2131 case ast_uint_constant
:
2132 case ast_float_constant
:
2133 case ast_bool_constant
:
2134 case ast_double_constant
:
2140 case ast_function_call
:
2141 unreachable("should be handled by ast_function_expression::hir");
2143 case ast_unsized_array_dim
:
2144 unreachable("ast_unsized_array_dim: Should never get here.");
2151 ast_expression_statement::hir(exec_list
*instructions
,
2152 struct _mesa_glsl_parse_state
*state
)
2154 /* It is possible to have expression statements that don't have an
2155 * expression. This is the solitary semicolon:
2157 * for (i = 0; i < 5; i++)
2160 * In this case the expression will be NULL. Test for NULL and don't do
2161 * anything in that case.
2163 if (expression
!= NULL
)
2164 expression
->hir_no_rvalue(instructions
, state
);
2166 /* Statements do not have r-values.
2173 ast_compound_statement::hir(exec_list
*instructions
,
2174 struct _mesa_glsl_parse_state
*state
)
2177 state
->symbols
->push_scope();
2179 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2180 ast
->hir(instructions
, state
);
2183 state
->symbols
->pop_scope();
2185 /* Compound statements do not have r-values.
2191 * Evaluate the given exec_node (which should be an ast_node representing
2192 * a single array dimension) and return its integer value.
2195 process_array_size(exec_node
*node
,
2196 struct _mesa_glsl_parse_state
*state
)
2198 exec_list dummy_instructions
;
2200 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2203 * Dimensions other than the outermost dimension can by unsized if they
2204 * are immediately sized by a constructor or initializer.
2206 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2209 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2210 YYLTYPE loc
= array_size
->get_location();
2213 _mesa_glsl_error(& loc
, state
,
2214 "array size could not be resolved");
2218 if (!ir
->type
->is_integer()) {
2219 _mesa_glsl_error(& loc
, state
,
2220 "array size must be integer type");
2224 if (!ir
->type
->is_scalar()) {
2225 _mesa_glsl_error(& loc
, state
,
2226 "array size must be scalar type");
2230 ir_constant
*const size
= ir
->constant_expression_value();
2232 (state
->is_version(120, 300) &&
2233 array_size
->has_sequence_subexpression())) {
2234 _mesa_glsl_error(& loc
, state
, "array size must be a "
2235 "constant valued expression");
2239 if (size
->value
.i
[0] <= 0) {
2240 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2244 assert(size
->type
== ir
->type
);
2246 /* If the array size is const (and we've verified that
2247 * it is) then no instructions should have been emitted
2248 * when we converted it to HIR. If they were emitted,
2249 * then either the array size isn't const after all, or
2250 * we are emitting unnecessary instructions.
2252 assert(dummy_instructions
.is_empty());
2254 return size
->value
.u
[0];
2257 static const glsl_type
*
2258 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2259 ast_array_specifier
*array_specifier
,
2260 struct _mesa_glsl_parse_state
*state
)
2262 const glsl_type
*array_type
= base
;
2264 if (array_specifier
!= NULL
) {
2265 if (base
->is_array()) {
2267 /* From page 19 (page 25) of the GLSL 1.20 spec:
2269 * "Only one-dimensional arrays may be declared."
2271 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2272 return glsl_type::error_type
;
2276 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2277 !node
->is_head_sentinel(); node
= node
->prev
) {
2278 unsigned array_size
= process_array_size(node
, state
);
2279 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2287 precision_qualifier_allowed(const glsl_type
*type
)
2289 /* Precision qualifiers apply to floating point, integer and opaque
2292 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2293 * "Any floating point or any integer declaration can have the type
2294 * preceded by one of these precision qualifiers [...] Literal
2295 * constants do not have precision qualifiers. Neither do Boolean
2298 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2301 * "Precision qualifiers are added for code portability with OpenGL
2302 * ES, not for functionality. They have the same syntax as in OpenGL
2305 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2307 * "uniform lowp sampler2D sampler;
2310 * lowp vec4 col = texture2D (sampler, coord);
2311 * // texture2D returns lowp"
2313 * From this, we infer that GLSL 1.30 (and later) should allow precision
2314 * qualifiers on sampler types just like float and integer types.
2316 const glsl_type
*const t
= type
->without_array();
2318 return (t
->is_float() || t
->is_integer() || t
->contains_opaque()) &&
2323 ast_type_specifier::glsl_type(const char **name
,
2324 struct _mesa_glsl_parse_state
*state
) const
2326 const struct glsl_type
*type
;
2328 type
= state
->symbols
->get_type(this->type_name
);
2329 *name
= this->type_name
;
2331 YYLTYPE loc
= this->get_location();
2332 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2338 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2340 * "The precision statement
2342 * precision precision-qualifier type;
2344 * can be used to establish a default precision qualifier. The type field can
2345 * be either int or float or any of the sampler types, (...) If type is float,
2346 * the directive applies to non-precision-qualified floating point type
2347 * (scalar, vector, and matrix) declarations. If type is int, the directive
2348 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2349 * and unsigned) declarations."
2351 * We use the symbol table to keep the values of the default precisions for
2352 * each 'type' in each scope and we use the 'type' string from the precision
2353 * statement as key in the symbol table. When we want to retrieve the default
2354 * precision associated with a given glsl_type we need to know the type string
2355 * associated with it. This is what this function returns.
2358 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2360 switch (type
->base_type
) {
2361 case GLSL_TYPE_FLOAT
:
2363 case GLSL_TYPE_UINT
:
2366 case GLSL_TYPE_ATOMIC_UINT
:
2367 return "atomic_uint";
2368 case GLSL_TYPE_IMAGE
:
2370 case GLSL_TYPE_SAMPLER
: {
2371 const unsigned type_idx
=
2372 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2373 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2374 assert(type_idx
< 4);
2375 switch (type
->sampled_type
) {
2376 case GLSL_TYPE_FLOAT
:
2377 switch (type
->sampler_dimensionality
) {
2378 case GLSL_SAMPLER_DIM_1D
: {
2379 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2380 static const char *const names
[4] = {
2381 "sampler1D", "sampler1DArray",
2382 "sampler1DShadow", "sampler1DArrayShadow"
2384 return names
[type_idx
];
2386 case GLSL_SAMPLER_DIM_2D
: {
2387 static const char *const names
[8] = {
2388 "sampler2D", "sampler2DArray",
2389 "sampler2DShadow", "sampler2DArrayShadow",
2390 "image2D", "image2DArray", NULL
, NULL
2392 return names
[offset
+ type_idx
];
2394 case GLSL_SAMPLER_DIM_3D
: {
2395 static const char *const names
[8] = {
2396 "sampler3D", NULL
, NULL
, NULL
,
2397 "image3D", NULL
, NULL
, NULL
2399 return names
[offset
+ type_idx
];
2401 case GLSL_SAMPLER_DIM_CUBE
: {
2402 static const char *const names
[8] = {
2403 "samplerCube", "samplerCubeArray",
2404 "samplerCubeShadow", "samplerCubeArrayShadow",
2405 "imageCube", NULL
, NULL
, NULL
2407 return names
[offset
+ type_idx
];
2409 case GLSL_SAMPLER_DIM_MS
: {
2410 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2411 static const char *const names
[4] = {
2412 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2414 return names
[type_idx
];
2416 case GLSL_SAMPLER_DIM_RECT
: {
2417 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2418 static const char *const names
[4] = {
2419 "samplerRect", NULL
, "samplerRectShadow", NULL
2421 return names
[type_idx
];
2423 case GLSL_SAMPLER_DIM_BUF
: {
2424 static const char *const names
[8] = {
2425 "samplerBuffer", NULL
, NULL
, NULL
,
2426 "imageBuffer", NULL
, NULL
, NULL
2428 return names
[offset
+ type_idx
];
2430 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2431 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2432 static const char *const names
[4] = {
2433 "samplerExternalOES", NULL
, NULL
, NULL
2435 return names
[type_idx
];
2438 unreachable("Unsupported sampler/image dimensionality");
2439 } /* sampler/image float dimensionality */
2442 switch (type
->sampler_dimensionality
) {
2443 case GLSL_SAMPLER_DIM_1D
: {
2444 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2445 static const char *const names
[4] = {
2446 "isampler1D", "isampler1DArray", NULL
, NULL
2448 return names
[type_idx
];
2450 case GLSL_SAMPLER_DIM_2D
: {
2451 static const char *const names
[8] = {
2452 "isampler2D", "isampler2DArray", NULL
, NULL
,
2453 "iimage2D", "iimage2DArray", NULL
, NULL
2455 return names
[offset
+ type_idx
];
2457 case GLSL_SAMPLER_DIM_3D
: {
2458 static const char *const names
[8] = {
2459 "isampler3D", NULL
, NULL
, NULL
,
2460 "iimage3D", NULL
, NULL
, NULL
2462 return names
[offset
+ type_idx
];
2464 case GLSL_SAMPLER_DIM_CUBE
: {
2465 static const char *const names
[8] = {
2466 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2467 "iimageCube", NULL
, NULL
, NULL
2469 return names
[offset
+ type_idx
];
2471 case GLSL_SAMPLER_DIM_MS
: {
2472 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2473 static const char *const names
[4] = {
2474 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2476 return names
[type_idx
];
2478 case GLSL_SAMPLER_DIM_RECT
: {
2479 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2480 static const char *const names
[4] = {
2481 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2483 return names
[type_idx
];
2485 case GLSL_SAMPLER_DIM_BUF
: {
2486 static const char *const names
[8] = {
2487 "isamplerBuffer", NULL
, NULL
, NULL
,
2488 "iimageBuffer", NULL
, NULL
, NULL
2490 return names
[offset
+ type_idx
];
2493 unreachable("Unsupported isampler/iimage dimensionality");
2494 } /* sampler/image int dimensionality */
2496 case GLSL_TYPE_UINT
:
2497 switch (type
->sampler_dimensionality
) {
2498 case GLSL_SAMPLER_DIM_1D
: {
2499 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2500 static const char *const names
[4] = {
2501 "usampler1D", "usampler1DArray", NULL
, NULL
2503 return names
[type_idx
];
2505 case GLSL_SAMPLER_DIM_2D
: {
2506 static const char *const names
[8] = {
2507 "usampler2D", "usampler2DArray", NULL
, NULL
,
2508 "uimage2D", "uimage2DArray", NULL
, NULL
2510 return names
[offset
+ type_idx
];
2512 case GLSL_SAMPLER_DIM_3D
: {
2513 static const char *const names
[8] = {
2514 "usampler3D", NULL
, NULL
, NULL
,
2515 "uimage3D", NULL
, NULL
, NULL
2517 return names
[offset
+ type_idx
];
2519 case GLSL_SAMPLER_DIM_CUBE
: {
2520 static const char *const names
[8] = {
2521 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2522 "uimageCube", NULL
, NULL
, NULL
2524 return names
[offset
+ type_idx
];
2526 case GLSL_SAMPLER_DIM_MS
: {
2527 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2528 static const char *const names
[4] = {
2529 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2531 return names
[type_idx
];
2533 case GLSL_SAMPLER_DIM_RECT
: {
2534 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2535 static const char *const names
[4] = {
2536 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2538 return names
[type_idx
];
2540 case GLSL_SAMPLER_DIM_BUF
: {
2541 static const char *const names
[8] = {
2542 "usamplerBuffer", NULL
, NULL
, NULL
,
2543 "uimageBuffer", NULL
, NULL
, NULL
2545 return names
[offset
+ type_idx
];
2548 unreachable("Unsupported usampler/uimage dimensionality");
2549 } /* sampler/image uint dimensionality */
2552 unreachable("Unsupported sampler/image type");
2553 } /* sampler/image type */
2555 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2558 unreachable("Unsupported type");
2563 select_gles_precision(unsigned qual_precision
,
2564 const glsl_type
*type
,
2565 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2567 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2568 * In GLES we take the precision from the type qualifier if present,
2569 * otherwise, if the type of the variable allows precision qualifiers at
2570 * all, we look for the default precision qualifier for that type in the
2573 assert(state
->es_shader
);
2575 unsigned precision
= GLSL_PRECISION_NONE
;
2576 if (qual_precision
) {
2577 precision
= qual_precision
;
2578 } else if (precision_qualifier_allowed(type
)) {
2579 const char *type_name
=
2580 get_type_name_for_precision_qualifier(type
->without_array());
2581 assert(type_name
!= NULL
);
2584 state
->symbols
->get_default_precision_qualifier(type_name
);
2585 if (precision
== ast_precision_none
) {
2586 _mesa_glsl_error(loc
, state
,
2587 "No precision specified in this scope for type `%s'",
2593 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2595 * "The default precision of all atomic types is highp. It is an error to
2596 * declare an atomic type with a different precision or to specify the
2597 * default precision for an atomic type to be lowp or mediump."
2599 if (type
->base_type
== GLSL_TYPE_ATOMIC_UINT
&&
2600 precision
!= ast_precision_high
) {
2601 _mesa_glsl_error(loc
, state
,
2602 "atomic_uint can only have highp precision qualifier");
2609 ast_fully_specified_type::glsl_type(const char **name
,
2610 struct _mesa_glsl_parse_state
*state
) const
2612 return this->specifier
->glsl_type(name
, state
);
2616 * Determine whether a toplevel variable declaration declares a varying. This
2617 * function operates by examining the variable's mode and the shader target,
2618 * so it correctly identifies linkage variables regardless of whether they are
2619 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2621 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2622 * this function will produce undefined results.
2625 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2628 case MESA_SHADER_VERTEX
:
2629 return var
->data
.mode
== ir_var_shader_out
;
2630 case MESA_SHADER_FRAGMENT
:
2631 return var
->data
.mode
== ir_var_shader_in
;
2633 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2639 * Matrix layout qualifiers are only allowed on certain types
2642 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2644 const glsl_type
*type
,
2647 if (var
&& !var
->is_in_buffer_block()) {
2648 /* Layout qualifiers may only apply to interface blocks and fields in
2651 _mesa_glsl_error(loc
, state
,
2652 "uniform block layout qualifiers row_major and "
2653 "column_major may not be applied to variables "
2654 "outside of uniform blocks");
2655 } else if (!type
->without_array()->is_matrix()) {
2656 /* The OpenGL ES 3.0 conformance tests did not originally allow
2657 * matrix layout qualifiers on non-matrices. However, the OpenGL
2658 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2659 * amended to specifically allow these layouts on all types. Emit
2660 * a warning so that people know their code may not be portable.
2662 _mesa_glsl_warning(loc
, state
,
2663 "uniform block layout qualifiers row_major and "
2664 "column_major applied to non-matrix types may "
2665 "be rejected by older compilers");
2670 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2671 struct _mesa_glsl_parse_state
*state
,
2672 unsigned xfb_buffer
) {
2673 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2674 _mesa_glsl_error(loc
, state
,
2675 "invalid xfb_buffer specified %d is larger than "
2676 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2678 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2685 /* From the ARB_enhanced_layouts spec:
2687 * "Variables and block members qualified with *xfb_offset* can be
2688 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2689 * The offset must be a multiple of the size of the first component of
2690 * the first qualified variable or block member, or a compile-time error
2691 * results. Further, if applied to an aggregate containing a double,
2692 * the offset must also be a multiple of 8, and the space taken in the
2693 * buffer will be a multiple of 8.
2696 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2697 struct _mesa_glsl_parse_state
*state
,
2698 int xfb_offset
, const glsl_type
*type
,
2699 unsigned component_size
) {
2700 const glsl_type
*t_without_array
= type
->without_array();
2702 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2703 _mesa_glsl_error(loc
, state
,
2704 "xfb_offset can't be used with unsized arrays.");
2708 /* Make sure nested structs don't contain unsized arrays, and validate
2709 * any xfb_offsets on interface members.
2711 if (t_without_array
->is_record() || t_without_array
->is_interface())
2712 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2713 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2715 /* When the interface block doesn't have an xfb_offset qualifier then
2716 * we apply the component size rules at the member level.
2718 if (xfb_offset
== -1)
2719 component_size
= member_t
->contains_double() ? 8 : 4;
2721 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2722 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2726 /* Nested structs or interface block without offset may not have had an
2727 * offset applied yet so return.
2729 if (xfb_offset
== -1) {
2733 if (xfb_offset
% component_size
) {
2734 _mesa_glsl_error(loc
, state
,
2735 "invalid qualifier xfb_offset=%d must be a multiple "
2736 "of the first component size of the first qualified "
2737 "variable or block member. Or double if an aggregate "
2738 "that contains a double (%d).",
2739 xfb_offset
, component_size
);
2747 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2750 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2751 _mesa_glsl_error(loc
, state
,
2752 "invalid stream specified %d is larger than "
2753 "MAX_VERTEX_STREAMS - 1 (%d).",
2754 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2762 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2765 const glsl_type
*type
,
2766 const ast_type_qualifier
*qual
)
2768 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2769 _mesa_glsl_error(loc
, state
,
2770 "the \"binding\" qualifier only applies to uniforms and "
2771 "shader storage buffer objects");
2775 unsigned qual_binding
;
2776 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2781 const struct gl_context
*const ctx
= state
->ctx
;
2782 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2783 unsigned max_index
= qual_binding
+ elements
- 1;
2784 const glsl_type
*base_type
= type
->without_array();
2786 if (base_type
->is_interface()) {
2787 /* UBOs. From page 60 of the GLSL 4.20 specification:
2788 * "If the binding point for any uniform block instance is less than zero,
2789 * or greater than or equal to the implementation-dependent maximum
2790 * number of uniform buffer bindings, a compilation error will occur.
2791 * When the binding identifier is used with a uniform block instanced as
2792 * an array of size N, all elements of the array from binding through
2793 * binding + N – 1 must be within this range."
2795 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2797 if (qual
->flags
.q
.uniform
&&
2798 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2799 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2800 "the maximum number of UBO binding points (%d)",
2801 qual_binding
, elements
,
2802 ctx
->Const
.MaxUniformBufferBindings
);
2806 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2807 * "If the binding point for any uniform or shader storage block instance
2808 * is less than zero, or greater than or equal to the
2809 * implementation-dependent maximum number of uniform buffer bindings, a
2810 * compile-time error will occur. When the binding identifier is used
2811 * with a uniform or shader storage block instanced as an array of size
2812 * N, all elements of the array from binding through binding + N – 1 must
2813 * be within this range."
2815 if (qual
->flags
.q
.buffer
&&
2816 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2817 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2818 "the maximum number of SSBO binding points (%d)",
2819 qual_binding
, elements
,
2820 ctx
->Const
.MaxShaderStorageBufferBindings
);
2823 } else if (base_type
->is_sampler()) {
2824 /* Samplers. From page 63 of the GLSL 4.20 specification:
2825 * "If the binding is less than zero, or greater than or equal to the
2826 * implementation-dependent maximum supported number of units, a
2827 * compilation error will occur. When the binding identifier is used
2828 * with an array of size N, all elements of the array from binding
2829 * through binding + N - 1 must be within this range."
2831 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2833 if (max_index
>= limit
) {
2834 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2835 "exceeds the maximum number of texture image units "
2836 "(%u)", qual_binding
, elements
, limit
);
2840 } else if (base_type
->contains_atomic()) {
2841 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2842 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2843 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2844 " maximum number of atomic counter buffer bindings"
2845 "(%u)", qual_binding
,
2846 ctx
->Const
.MaxAtomicBufferBindings
);
2850 } else if ((state
->is_version(420, 310) ||
2851 state
->ARB_shading_language_420pack_enable
) &&
2852 base_type
->is_image()) {
2853 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2854 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2855 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2856 " maximum number of image units (%d)", max_index
,
2857 ctx
->Const
.MaxImageUnits
);
2862 _mesa_glsl_error(loc
, state
,
2863 "the \"binding\" qualifier only applies to uniform "
2864 "blocks, opaque variables, or arrays thereof");
2868 var
->data
.explicit_binding
= true;
2869 var
->data
.binding
= qual_binding
;
2876 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
2878 const glsl_interp_mode interpolation
,
2879 const struct ast_type_qualifier
*qual
,
2880 const struct glsl_type
*var_type
,
2881 ir_variable_mode mode
)
2883 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
2884 * not to vertex shader inputs nor fragment shader outputs.
2886 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2887 * "Outputs from a vertex shader (out) and inputs to a fragment
2888 * shader (in) can be further qualified with one or more of these
2889 * interpolation qualifiers"
2891 * "These interpolation qualifiers may only precede the qualifiers in,
2892 * centroid in, out, or centroid out in a declaration. They do not apply
2893 * to the deprecated storage qualifiers varying or centroid
2894 * varying. They also do not apply to inputs into a vertex shader or
2895 * outputs from a fragment shader."
2897 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
2898 * "Outputs from a shader (out) and inputs to a shader (in) can be
2899 * further qualified with one of these interpolation qualifiers."
2901 * "These interpolation qualifiers may only precede the qualifiers
2902 * in, centroid in, out, or centroid out in a declaration. They do
2903 * not apply to inputs into a vertex shader or outputs from a
2906 if (state
->is_version(130, 300)
2907 && interpolation
!= INTERP_MODE_NONE
) {
2908 const char *i
= interpolation_string(interpolation
);
2909 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
2910 _mesa_glsl_error(loc
, state
,
2911 "interpolation qualifier `%s' can only be applied to "
2912 "shader inputs or outputs.", i
);
2914 switch (state
->stage
) {
2915 case MESA_SHADER_VERTEX
:
2916 if (mode
== ir_var_shader_in
) {
2917 _mesa_glsl_error(loc
, state
,
2918 "interpolation qualifier '%s' cannot be applied to "
2919 "vertex shader inputs", i
);
2922 case MESA_SHADER_FRAGMENT
:
2923 if (mode
== ir_var_shader_out
) {
2924 _mesa_glsl_error(loc
, state
,
2925 "interpolation qualifier '%s' cannot be applied to "
2926 "fragment shader outputs", i
);
2934 /* Interpolation qualifiers cannot be applied to 'centroid' and
2935 * 'centroid varying'.
2937 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2938 * "interpolation qualifiers may only precede the qualifiers in,
2939 * centroid in, out, or centroid out in a declaration. They do not apply
2940 * to the deprecated storage qualifiers varying or centroid varying."
2942 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2944 if (state
->is_version(130, 0)
2945 && interpolation
!= INTERP_MODE_NONE
2946 && qual
->flags
.q
.varying
) {
2948 const char *i
= interpolation_string(interpolation
);
2950 if (qual
->flags
.q
.centroid
)
2951 s
= "centroid varying";
2955 _mesa_glsl_error(loc
, state
,
2956 "qualifier '%s' cannot be applied to the "
2957 "deprecated storage qualifier '%s'", i
, s
);
2960 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2961 * so must integer vertex outputs.
2963 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2964 * "Fragment shader inputs that are signed or unsigned integers or
2965 * integer vectors must be qualified with the interpolation qualifier
2968 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2969 * "Fragment shader inputs that are, or contain, signed or unsigned
2970 * integers or integer vectors must be qualified with the
2971 * interpolation qualifier flat."
2973 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2974 * "Vertex shader outputs that are, or contain, signed or unsigned
2975 * integers or integer vectors must be qualified with the
2976 * interpolation qualifier flat."
2978 * Note that prior to GLSL 1.50, this requirement applied to vertex
2979 * outputs rather than fragment inputs. That creates problems in the
2980 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2981 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2982 * apply the restriction to both vertex outputs and fragment inputs.
2984 * Note also that the desktop GLSL specs are missing the text "or
2985 * contain"; this is presumably an oversight, since there is no
2986 * reasonable way to interpolate a fragment shader input that contains
2987 * an integer. See Khronos bug #15671.
2989 if (state
->is_version(130, 300)
2990 && var_type
->contains_integer()
2991 && interpolation
!= INTERP_MODE_FLAT
2992 && state
->stage
== MESA_SHADER_FRAGMENT
2993 && mode
== ir_var_shader_in
) {
2994 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
2995 "an integer, then it must be qualified with 'flat'");
2998 /* Double fragment inputs must be qualified with 'flat'.
3000 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
3001 * "This extension does not support interpolation of double-precision
3002 * values; doubles used as fragment shader inputs must be qualified as
3005 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
3006 * "Fragment shader inputs that are signed or unsigned integers, integer
3007 * vectors, or any double-precision floating-point type must be
3008 * qualified with the interpolation qualifier flat."
3010 * Note that the GLSL specs are missing the text "or contain"; this is
3011 * presumably an oversight. See Khronos bug #15671.
3013 * The 'double' type does not exist in GLSL ES so far.
3015 if (state
->has_double()
3016 && var_type
->contains_double()
3017 && interpolation
!= INTERP_MODE_FLAT
3018 && state
->stage
== MESA_SHADER_FRAGMENT
3019 && mode
== ir_var_shader_in
) {
3020 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3021 "a double, then it must be qualified with 'flat'");
3025 static glsl_interp_mode
3026 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3027 const struct glsl_type
*var_type
,
3028 ir_variable_mode mode
,
3029 struct _mesa_glsl_parse_state
*state
,
3032 glsl_interp_mode interpolation
;
3033 if (qual
->flags
.q
.flat
)
3034 interpolation
= INTERP_MODE_FLAT
;
3035 else if (qual
->flags
.q
.noperspective
)
3036 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3037 else if (qual
->flags
.q
.smooth
)
3038 interpolation
= INTERP_MODE_SMOOTH
;
3039 else if (state
->es_shader
&&
3040 ((mode
== ir_var_shader_in
&&
3041 state
->stage
!= MESA_SHADER_VERTEX
) ||
3042 (mode
== ir_var_shader_out
&&
3043 state
->stage
!= MESA_SHADER_FRAGMENT
)))
3044 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
3046 * "When no interpolation qualifier is present, smooth interpolation
3049 interpolation
= INTERP_MODE_SMOOTH
;
3051 interpolation
= INTERP_MODE_NONE
;
3053 validate_interpolation_qualifier(state
, loc
,
3055 qual
, var_type
, mode
);
3057 return interpolation
;
3062 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3064 struct _mesa_glsl_parse_state
*state
,
3069 unsigned qual_location
;
3070 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3075 /* Checks for GL_ARB_explicit_uniform_location. */
3076 if (qual
->flags
.q
.uniform
) {
3077 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3080 const struct gl_context
*const ctx
= state
->ctx
;
3081 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3083 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3084 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3085 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3086 ctx
->Const
.MaxUserAssignableUniformLocations
);
3090 var
->data
.explicit_location
= true;
3091 var
->data
.location
= qual_location
;
3095 /* Between GL_ARB_explicit_attrib_location an
3096 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3097 * stage can be assigned explicit locations. The checking here associates
3098 * the correct extension with the correct stage's input / output:
3102 * vertex explicit_loc sso
3103 * tess control sso sso
3106 * fragment sso explicit_loc
3108 switch (state
->stage
) {
3109 case MESA_SHADER_VERTEX
:
3110 if (var
->data
.mode
== ir_var_shader_in
) {
3111 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3117 if (var
->data
.mode
== ir_var_shader_out
) {
3118 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3127 case MESA_SHADER_TESS_CTRL
:
3128 case MESA_SHADER_TESS_EVAL
:
3129 case MESA_SHADER_GEOMETRY
:
3130 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3131 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3140 case MESA_SHADER_FRAGMENT
:
3141 if (var
->data
.mode
== ir_var_shader_in
) {
3142 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3148 if (var
->data
.mode
== ir_var_shader_out
) {
3149 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3158 case MESA_SHADER_COMPUTE
:
3159 _mesa_glsl_error(loc
, state
,
3160 "compute shader variables cannot be given "
3161 "explicit locations");
3166 _mesa_glsl_error(loc
, state
,
3167 "%s cannot be given an explicit location in %s shader",
3169 _mesa_shader_stage_to_string(state
->stage
));
3171 var
->data
.explicit_location
= true;
3173 switch (state
->stage
) {
3174 case MESA_SHADER_VERTEX
:
3175 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3176 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3177 : (qual_location
+ VARYING_SLOT_VAR0
);
3180 case MESA_SHADER_TESS_CTRL
:
3181 case MESA_SHADER_TESS_EVAL
:
3182 case MESA_SHADER_GEOMETRY
:
3183 if (var
->data
.patch
)
3184 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3186 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3189 case MESA_SHADER_FRAGMENT
:
3190 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3191 ? (qual_location
+ FRAG_RESULT_DATA0
)
3192 : (qual_location
+ VARYING_SLOT_VAR0
);
3194 case MESA_SHADER_COMPUTE
:
3195 assert(!"Unexpected shader type");
3199 /* Check if index was set for the uniform instead of the function */
3200 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
3201 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3202 "used with subroutine functions");
3206 unsigned qual_index
;
3207 if (qual
->flags
.q
.explicit_index
&&
3208 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3210 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3211 * Layout Qualifiers):
3213 * "It is also a compile-time error if a fragment shader
3214 * sets a layout index to less than 0 or greater than 1."
3216 * Older specifications don't mandate a behavior; we take
3217 * this as a clarification and always generate the error.
3219 if (qual_index
> 1) {
3220 _mesa_glsl_error(loc
, state
,
3221 "explicit index may only be 0 or 1");
3223 var
->data
.explicit_index
= true;
3224 var
->data
.index
= qual_index
;
3231 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3233 struct _mesa_glsl_parse_state
*state
,
3236 const glsl_type
*base_type
= var
->type
->without_array();
3238 if (base_type
->is_image()) {
3239 if (var
->data
.mode
!= ir_var_uniform
&&
3240 var
->data
.mode
!= ir_var_function_in
) {
3241 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3242 "function parameters or uniform-qualified "
3243 "global variables");
3246 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
3247 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
3248 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
3249 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
3250 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
3251 var
->data
.read_only
= true;
3253 if (qual
->flags
.q
.explicit_image_format
) {
3254 if (var
->data
.mode
== ir_var_function_in
) {
3255 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
3256 "used on image function parameters");
3259 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3260 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
3261 "base data type of the image");
3264 var
->data
.image_format
= qual
->image_format
;
3266 if (var
->data
.mode
== ir_var_uniform
) {
3267 if (state
->es_shader
) {
3268 _mesa_glsl_error(loc
, state
, "all image uniforms "
3269 "must have a format layout qualifier");
3271 } else if (!qual
->flags
.q
.write_only
) {
3272 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3273 "`writeonly' must have a format layout "
3278 var
->data
.image_format
= GL_NONE
;
3281 /* From page 70 of the GLSL ES 3.1 specification:
3283 * "Except for image variables qualified with the format qualifiers
3284 * r32f, r32i, and r32ui, image variables must specify either memory
3285 * qualifier readonly or the memory qualifier writeonly."
3287 if (state
->es_shader
&&
3288 var
->data
.image_format
!= GL_R32F
&&
3289 var
->data
.image_format
!= GL_R32I
&&
3290 var
->data
.image_format
!= GL_R32UI
&&
3291 !var
->data
.image_read_only
&&
3292 !var
->data
.image_write_only
) {
3293 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3294 "r32f, r32i or r32ui must be qualified `readonly' or "
3298 } else if (qual
->flags
.q
.read_only
||
3299 qual
->flags
.q
.write_only
||
3300 qual
->flags
.q
.coherent
||
3301 qual
->flags
.q
._volatile
||
3302 qual
->flags
.q
.restrict_flag
||
3303 qual
->flags
.q
.explicit_image_format
) {
3304 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3309 static inline const char*
3310 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3312 if (origin_upper_left
&& pixel_center_integer
)
3313 return "origin_upper_left, pixel_center_integer";
3314 else if (origin_upper_left
)
3315 return "origin_upper_left";
3316 else if (pixel_center_integer
)
3317 return "pixel_center_integer";
3323 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3324 const struct ast_type_qualifier
*qual
)
3326 /* If gl_FragCoord was previously declared, and the qualifiers were
3327 * different in any way, return true.
3329 if (state
->fs_redeclares_gl_fragcoord
) {
3330 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3331 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3338 validate_array_dimensions(const glsl_type
*t
,
3339 struct _mesa_glsl_parse_state
*state
,
3341 if (t
->is_array()) {
3342 t
= t
->fields
.array
;
3343 while (t
->is_array()) {
3344 if (t
->is_unsized_array()) {
3345 _mesa_glsl_error(loc
, state
,
3346 "only the outermost array dimension can "
3351 t
= t
->fields
.array
;
3357 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3359 struct _mesa_glsl_parse_state
*state
,
3362 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3364 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3366 * "Within any shader, the first redeclarations of gl_FragCoord
3367 * must appear before any use of gl_FragCoord."
3369 * Generate a compiler error if above condition is not met by the
3372 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3373 if (earlier
!= NULL
&&
3374 earlier
->data
.used
&&
3375 !state
->fs_redeclares_gl_fragcoord
) {
3376 _mesa_glsl_error(loc
, state
,
3377 "gl_FragCoord used before its first redeclaration "
3378 "in fragment shader");
3381 /* Make sure all gl_FragCoord redeclarations specify the same layout
3384 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3385 const char *const qual_string
=
3386 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3387 qual
->flags
.q
.pixel_center_integer
);
3389 const char *const state_string
=
3390 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3391 state
->fs_pixel_center_integer
);
3393 _mesa_glsl_error(loc
, state
,
3394 "gl_FragCoord redeclared with different layout "
3395 "qualifiers (%s) and (%s) ",
3399 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3400 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3401 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3402 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3403 state
->fs_redeclares_gl_fragcoord
=
3404 state
->fs_origin_upper_left
||
3405 state
->fs_pixel_center_integer
||
3406 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3409 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3410 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3411 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3412 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3413 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3414 ? "origin_upper_left" : "pixel_center_integer";
3416 _mesa_glsl_error(loc
, state
,
3417 "layout qualifier `%s' can only be applied to "
3418 "fragment shader input `gl_FragCoord'",
3422 if (qual
->flags
.q
.explicit_location
) {
3423 apply_explicit_location(qual
, var
, state
, loc
);
3425 if (qual
->flags
.q
.explicit_component
) {
3426 unsigned qual_component
;
3427 if (process_qualifier_constant(state
, loc
, "component",
3428 qual
->component
, &qual_component
)) {
3429 const glsl_type
*type
= var
->type
->without_array();
3430 unsigned components
= type
->component_slots();
3432 if (type
->is_matrix() || type
->is_record()) {
3433 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3434 "cannot be applied to a matrix, a structure, "
3435 "a block, or an array containing any of "
3437 } else if (qual_component
!= 0 &&
3438 (qual_component
+ components
- 1) > 3) {
3439 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3440 (qual_component
+ components
- 1));
3441 } else if (qual_component
== 1 && type
->is_64bit()) {
3442 /* We don't bother checking for 3 as it should be caught by the
3443 * overflow check above.
3445 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3446 "component 1 or 3");
3448 var
->data
.explicit_component
= true;
3449 var
->data
.location_frac
= qual_component
;
3453 } else if (qual
->flags
.q
.explicit_index
) {
3454 if (!qual
->flags
.q
.subroutine_def
)
3455 _mesa_glsl_error(loc
, state
,
3456 "explicit index requires explicit location");
3457 } else if (qual
->flags
.q
.explicit_component
) {
3458 _mesa_glsl_error(loc
, state
,
3459 "explicit component requires explicit location");
3462 if (qual
->flags
.q
.explicit_binding
) {
3463 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3466 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3467 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3468 unsigned qual_stream
;
3469 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3471 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3472 var
->data
.stream
= qual_stream
;
3476 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3477 unsigned qual_xfb_buffer
;
3478 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3479 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3480 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3481 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3482 if (qual
->flags
.q
.explicit_xfb_buffer
)
3483 var
->data
.explicit_xfb_buffer
= true;
3487 if (qual
->flags
.q
.explicit_xfb_offset
) {
3488 unsigned qual_xfb_offset
;
3489 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3491 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3492 qual
->offset
, &qual_xfb_offset
) &&
3493 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3494 var
->type
, component_size
)) {
3495 var
->data
.offset
= qual_xfb_offset
;
3496 var
->data
.explicit_xfb_offset
= true;
3500 if (qual
->flags
.q
.explicit_xfb_stride
) {
3501 unsigned qual_xfb_stride
;
3502 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3503 qual
->xfb_stride
, &qual_xfb_stride
)) {
3504 var
->data
.xfb_stride
= qual_xfb_stride
;
3505 var
->data
.explicit_xfb_stride
= true;
3509 if (var
->type
->contains_atomic()) {
3510 if (var
->data
.mode
== ir_var_uniform
) {
3511 if (var
->data
.explicit_binding
) {
3513 &state
->atomic_counter_offsets
[var
->data
.binding
];
3515 if (*offset
% ATOMIC_COUNTER_SIZE
)
3516 _mesa_glsl_error(loc
, state
,
3517 "misaligned atomic counter offset");
3519 var
->data
.offset
= *offset
;
3520 *offset
+= var
->type
->atomic_size();
3523 _mesa_glsl_error(loc
, state
,
3524 "atomic counters require explicit binding point");
3526 } else if (var
->data
.mode
!= ir_var_function_in
) {
3527 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3528 "function parameters or uniform-qualified "
3529 "global variables");
3533 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3534 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3535 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3536 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3537 * These extensions and all following extensions that add the 'layout'
3538 * keyword have been modified to require the use of 'in' or 'out'.
3540 * The following extension do not allow the deprecated keywords:
3542 * GL_AMD_conservative_depth
3543 * GL_ARB_conservative_depth
3544 * GL_ARB_gpu_shader5
3545 * GL_ARB_separate_shader_objects
3546 * GL_ARB_tessellation_shader
3547 * GL_ARB_transform_feedback3
3548 * GL_ARB_uniform_buffer_object
3550 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3551 * allow layout with the deprecated keywords.
3553 const bool relaxed_layout_qualifier_checking
=
3554 state
->ARB_fragment_coord_conventions_enable
;
3556 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3557 || qual
->flags
.q
.varying
;
3558 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3559 if (relaxed_layout_qualifier_checking
) {
3560 _mesa_glsl_warning(loc
, state
,
3561 "`layout' qualifier may not be used with "
3562 "`attribute' or `varying'");
3564 _mesa_glsl_error(loc
, state
,
3565 "`layout' qualifier may not be used with "
3566 "`attribute' or `varying'");
3570 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3571 * AMD_conservative_depth.
3573 int depth_layout_count
= qual
->flags
.q
.depth_any
3574 + qual
->flags
.q
.depth_greater
3575 + qual
->flags
.q
.depth_less
3576 + qual
->flags
.q
.depth_unchanged
;
3577 if (depth_layout_count
> 0
3578 && !state
->is_version(420, 0)
3579 && !state
->AMD_conservative_depth_enable
3580 && !state
->ARB_conservative_depth_enable
) {
3581 _mesa_glsl_error(loc
, state
,
3582 "extension GL_AMD_conservative_depth or "
3583 "GL_ARB_conservative_depth must be enabled "
3584 "to use depth layout qualifiers");
3585 } else if (depth_layout_count
> 0
3586 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3587 _mesa_glsl_error(loc
, state
,
3588 "depth layout qualifiers can be applied only to "
3590 } else if (depth_layout_count
> 1
3591 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3592 _mesa_glsl_error(loc
, state
,
3593 "at most one depth layout qualifier can be applied to "
3596 if (qual
->flags
.q
.depth_any
)
3597 var
->data
.depth_layout
= ir_depth_layout_any
;
3598 else if (qual
->flags
.q
.depth_greater
)
3599 var
->data
.depth_layout
= ir_depth_layout_greater
;
3600 else if (qual
->flags
.q
.depth_less
)
3601 var
->data
.depth_layout
= ir_depth_layout_less
;
3602 else if (qual
->flags
.q
.depth_unchanged
)
3603 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3605 var
->data
.depth_layout
= ir_depth_layout_none
;
3607 if (qual
->flags
.q
.std140
||
3608 qual
->flags
.q
.std430
||
3609 qual
->flags
.q
.packed
||
3610 qual
->flags
.q
.shared
) {
3611 _mesa_glsl_error(loc
, state
,
3612 "uniform and shader storage block layout qualifiers "
3613 "std140, std430, packed, and shared can only be "
3614 "applied to uniform or shader storage blocks, not "
3618 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3619 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3622 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3625 * "Fragment shaders also allow the following layout qualifier on in only
3626 * (not with variable declarations)
3627 * layout-qualifier-id
3628 * early_fragment_tests
3631 if (qual
->flags
.q
.early_fragment_tests
) {
3632 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3633 "valid in fragment shader input layout declaration.");
3638 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3640 struct _mesa_glsl_parse_state
*state
,
3644 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3646 if (qual
->flags
.q
.invariant
) {
3647 if (var
->data
.used
) {
3648 _mesa_glsl_error(loc
, state
,
3649 "variable `%s' may not be redeclared "
3650 "`invariant' after being used",
3653 var
->data
.invariant
= 1;
3657 if (qual
->flags
.q
.precise
) {
3658 if (var
->data
.used
) {
3659 _mesa_glsl_error(loc
, state
,
3660 "variable `%s' may not be redeclared "
3661 "`precise' after being used",
3664 var
->data
.precise
= 1;
3668 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3669 _mesa_glsl_error(loc
, state
,
3670 "`subroutine' may only be applied to uniforms, "
3671 "subroutine type declarations, or function definitions");
3674 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3675 || qual
->flags
.q
.uniform
3676 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3677 var
->data
.read_only
= 1;
3679 if (qual
->flags
.q
.centroid
)
3680 var
->data
.centroid
= 1;
3682 if (qual
->flags
.q
.sample
)
3683 var
->data
.sample
= 1;
3685 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3686 if (state
->es_shader
) {
3687 var
->data
.precision
=
3688 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3691 if (qual
->flags
.q
.patch
)
3692 var
->data
.patch
= 1;
3694 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3695 var
->type
= glsl_type::error_type
;
3696 _mesa_glsl_error(loc
, state
,
3697 "`attribute' variables may not be declared in the "
3699 _mesa_shader_stage_to_string(state
->stage
));
3702 /* Disallow layout qualifiers which may only appear on layout declarations. */
3703 if (qual
->flags
.q
.prim_type
) {
3704 _mesa_glsl_error(loc
, state
,
3705 "Primitive type may only be specified on GS input or output "
3706 "layout declaration, not on variables.");
3709 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3711 * "However, the const qualifier cannot be used with out or inout."
3713 * The same section of the GLSL 4.40 spec further clarifies this saying:
3715 * "The const qualifier cannot be used with out or inout, or a
3716 * compile-time error results."
3718 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3719 _mesa_glsl_error(loc
, state
,
3720 "`const' may not be applied to `out' or `inout' "
3721 "function parameters");
3724 /* If there is no qualifier that changes the mode of the variable, leave
3725 * the setting alone.
3727 assert(var
->data
.mode
!= ir_var_temporary
);
3728 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3729 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
3730 else if (qual
->flags
.q
.in
)
3731 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3732 else if (qual
->flags
.q
.attribute
3733 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3734 var
->data
.mode
= ir_var_shader_in
;
3735 else if (qual
->flags
.q
.out
)
3736 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3737 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3738 var
->data
.mode
= ir_var_shader_out
;
3739 else if (qual
->flags
.q
.uniform
)
3740 var
->data
.mode
= ir_var_uniform
;
3741 else if (qual
->flags
.q
.buffer
)
3742 var
->data
.mode
= ir_var_shader_storage
;
3743 else if (qual
->flags
.q
.shared_storage
)
3744 var
->data
.mode
= ir_var_shader_shared
;
3746 var
->data
.fb_fetch_output
= state
->stage
== MESA_SHADER_FRAGMENT
&&
3747 qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
3749 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3750 /* User-defined ins/outs are not permitted in compute shaders. */
3751 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3752 _mesa_glsl_error(loc
, state
,
3753 "user-defined input and output variables are not "
3754 "permitted in compute shaders");
3757 /* This variable is being used to link data between shader stages (in
3758 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3759 * that is allowed for such purposes.
3761 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3763 * "The varying qualifier can be used only with the data types
3764 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3767 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3768 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3770 * "Fragment inputs can only be signed and unsigned integers and
3771 * integer vectors, float, floating-point vectors, matrices, or
3772 * arrays of these. Structures cannot be input.
3774 * Similar text exists in the section on vertex shader outputs.
3776 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3777 * 3.00 spec allows structs as well. Varying structs are also allowed
3780 switch (var
->type
->get_scalar_type()->base_type
) {
3781 case GLSL_TYPE_FLOAT
:
3782 /* Ok in all GLSL versions */
3784 case GLSL_TYPE_UINT
:
3786 if (state
->is_version(130, 300))
3788 _mesa_glsl_error(loc
, state
,
3789 "varying variables must be of base type float in %s",
3790 state
->get_version_string());
3792 case GLSL_TYPE_STRUCT
:
3793 if (state
->is_version(150, 300))
3795 _mesa_glsl_error(loc
, state
,
3796 "varying variables may not be of type struct");
3798 case GLSL_TYPE_DOUBLE
:
3801 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3806 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3807 switch (state
->stage
) {
3808 case MESA_SHADER_VERTEX
:
3809 if (var
->data
.mode
== ir_var_shader_out
)
3810 var
->data
.invariant
= true;
3812 case MESA_SHADER_TESS_CTRL
:
3813 case MESA_SHADER_TESS_EVAL
:
3814 case MESA_SHADER_GEOMETRY
:
3815 if ((var
->data
.mode
== ir_var_shader_in
)
3816 || (var
->data
.mode
== ir_var_shader_out
))
3817 var
->data
.invariant
= true;
3819 case MESA_SHADER_FRAGMENT
:
3820 if (var
->data
.mode
== ir_var_shader_in
)
3821 var
->data
.invariant
= true;
3823 case MESA_SHADER_COMPUTE
:
3824 /* Invariance isn't meaningful in compute shaders. */
3829 var
->data
.interpolation
=
3830 interpret_interpolation_qualifier(qual
, var
->type
,
3831 (ir_variable_mode
) var
->data
.mode
,
3834 /* Does the declaration use the deprecated 'attribute' or 'varying'
3837 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3838 || qual
->flags
.q
.varying
;
3841 /* Validate auxiliary storage qualifiers */
3843 /* From section 4.3.4 of the GLSL 1.30 spec:
3844 * "It is an error to use centroid in in a vertex shader."
3846 * From section 4.3.4 of the GLSL ES 3.00 spec:
3847 * "It is an error to use centroid in or interpolation qualifiers in
3848 * a vertex shader input."
3851 /* Section 4.3.6 of the GLSL 1.30 specification states:
3852 * "It is an error to use centroid out in a fragment shader."
3854 * The GL_ARB_shading_language_420pack extension specification states:
3855 * "It is an error to use auxiliary storage qualifiers or interpolation
3856 * qualifiers on an output in a fragment shader."
3858 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3859 _mesa_glsl_error(loc
, state
,
3860 "sample qualifier may only be used on `in` or `out` "
3861 "variables between shader stages");
3863 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3864 _mesa_glsl_error(loc
, state
,
3865 "centroid qualifier may only be used with `in', "
3866 "`out' or `varying' variables between shader stages");
3869 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3870 _mesa_glsl_error(loc
, state
,
3871 "the shared storage qualifiers can only be used with "
3875 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3879 * Get the variable that is being redeclared by this declaration
3881 * Semantic checks to verify the validity of the redeclaration are also
3882 * performed. If semantic checks fail, compilation error will be emitted via
3883 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3886 * A pointer to an existing variable in the current scope if the declaration
3887 * is a redeclaration, \c NULL otherwise.
3889 static ir_variable
*
3890 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3891 struct _mesa_glsl_parse_state
*state
,
3892 bool allow_all_redeclarations
)
3894 /* Check if this declaration is actually a re-declaration, either to
3895 * resize an array or add qualifiers to an existing variable.
3897 * This is allowed for variables in the current scope, or when at
3898 * global scope (for built-ins in the implicit outer scope).
3900 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3901 if (earlier
== NULL
||
3902 (state
->current_function
!= NULL
&&
3903 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3908 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3910 * "It is legal to declare an array without a size and then
3911 * later re-declare the same name as an array of the same
3912 * type and specify a size."
3914 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3915 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3916 /* FINISHME: This doesn't match the qualifiers on the two
3917 * FINISHME: declarations. It's not 100% clear whether this is
3918 * FINISHME: required or not.
3921 const int size
= var
->type
->array_size();
3922 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3923 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3924 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3926 earlier
->data
.max_array_access
);
3929 earlier
->type
= var
->type
;
3932 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3933 state
->is_version(150, 0))
3934 && strcmp(var
->name
, "gl_FragCoord") == 0
3935 && earlier
->type
== var
->type
3936 && var
->data
.mode
== ir_var_shader_in
) {
3937 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3940 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3941 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3943 /* According to section 4.3.7 of the GLSL 1.30 spec,
3944 * the following built-in varaibles can be redeclared with an
3945 * interpolation qualifier:
3948 * * gl_FrontSecondaryColor
3949 * * gl_BackSecondaryColor
3951 * * gl_SecondaryColor
3953 } else if (state
->is_version(130, 0)
3954 && (strcmp(var
->name
, "gl_FrontColor") == 0
3955 || strcmp(var
->name
, "gl_BackColor") == 0
3956 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3957 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3958 || strcmp(var
->name
, "gl_Color") == 0
3959 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3960 && earlier
->type
== var
->type
3961 && earlier
->data
.mode
== var
->data
.mode
) {
3962 earlier
->data
.interpolation
= var
->data
.interpolation
;
3964 /* Layout qualifiers for gl_FragDepth. */
3965 } else if ((state
->is_version(420, 0) ||
3966 state
->AMD_conservative_depth_enable
||
3967 state
->ARB_conservative_depth_enable
)
3968 && strcmp(var
->name
, "gl_FragDepth") == 0
3969 && earlier
->type
== var
->type
3970 && earlier
->data
.mode
== var
->data
.mode
) {
3972 /** From the AMD_conservative_depth spec:
3973 * Within any shader, the first redeclarations of gl_FragDepth
3974 * must appear before any use of gl_FragDepth.
3976 if (earlier
->data
.used
) {
3977 _mesa_glsl_error(&loc
, state
,
3978 "the first redeclaration of gl_FragDepth "
3979 "must appear before any use of gl_FragDepth");
3982 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3983 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3984 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3985 _mesa_glsl_error(&loc
, state
,
3986 "gl_FragDepth: depth layout is declared here "
3987 "as '%s, but it was previously declared as "
3989 depth_layout_string(var
->data
.depth_layout
),
3990 depth_layout_string(earlier
->data
.depth_layout
));
3993 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3995 } else if (state
->has_framebuffer_fetch() &&
3996 strcmp(var
->name
, "gl_LastFragData") == 0 &&
3997 var
->type
== earlier
->type
&&
3998 var
->data
.mode
== ir_var_auto
) {
3999 /* According to the EXT_shader_framebuffer_fetch spec:
4001 * "By default, gl_LastFragData is declared with the mediump precision
4002 * qualifier. This can be changed by redeclaring the corresponding
4003 * variables with the desired precision qualifier."
4005 earlier
->data
.precision
= var
->data
.precision
;
4007 } else if (allow_all_redeclarations
) {
4008 if (earlier
->data
.mode
!= var
->data
.mode
) {
4009 _mesa_glsl_error(&loc
, state
,
4010 "redeclaration of `%s' with incorrect qualifiers",
4012 } else if (earlier
->type
!= var
->type
) {
4013 _mesa_glsl_error(&loc
, state
,
4014 "redeclaration of `%s' has incorrect type",
4018 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4025 * Generate the IR for an initializer in a variable declaration
4028 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4029 ast_fully_specified_type
*type
,
4030 exec_list
*initializer_instructions
,
4031 struct _mesa_glsl_parse_state
*state
)
4033 ir_rvalue
*result
= NULL
;
4035 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4037 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4039 * "All uniform variables are read-only and are initialized either
4040 * directly by an application via API commands, or indirectly by
4043 if (var
->data
.mode
== ir_var_uniform
) {
4044 state
->check_version(120, 0, &initializer_loc
,
4045 "cannot initialize uniform %s",
4049 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4051 * "Buffer variables cannot have initializers."
4053 if (var
->data
.mode
== ir_var_shader_storage
) {
4054 _mesa_glsl_error(&initializer_loc
, state
,
4055 "cannot initialize buffer variable %s",
4059 /* From section 4.1.7 of the GLSL 4.40 spec:
4061 * "Opaque variables [...] are initialized only through the
4062 * OpenGL API; they cannot be declared with an initializer in a
4065 if (var
->type
->contains_opaque()) {
4066 _mesa_glsl_error(&initializer_loc
, state
,
4067 "cannot initialize opaque variable %s",
4071 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4072 _mesa_glsl_error(&initializer_loc
, state
,
4073 "cannot initialize %s shader input / %s %s",
4074 _mesa_shader_stage_to_string(state
->stage
),
4075 (state
->stage
== MESA_SHADER_VERTEX
)
4076 ? "attribute" : "varying",
4080 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4081 _mesa_glsl_error(&initializer_loc
, state
,
4082 "cannot initialize %s shader output %s",
4083 _mesa_shader_stage_to_string(state
->stage
),
4087 /* If the initializer is an ast_aggregate_initializer, recursively store
4088 * type information from the LHS into it, so that its hir() function can do
4091 if (decl
->initializer
->oper
== ast_aggregate
)
4092 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4094 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4095 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4097 /* Calculate the constant value if this is a const or uniform
4100 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4102 * "Declarations of globals without a storage qualifier, or with
4103 * just the const qualifier, may include initializers, in which case
4104 * they will be initialized before the first line of main() is
4105 * executed. Such initializers must be a constant expression."
4107 * The same section of the GLSL ES 3.00.4 spec has similar language.
4109 if (type
->qualifier
.flags
.q
.constant
4110 || type
->qualifier
.flags
.q
.uniform
4111 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4112 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4114 if (new_rhs
!= NULL
) {
4117 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4120 * "A constant expression is one of
4124 * - an expression formed by an operator on operands that are
4125 * all constant expressions, including getting an element of
4126 * a constant array, or a field of a constant structure, or
4127 * components of a constant vector. However, the sequence
4128 * operator ( , ) and the assignment operators ( =, +=, ...)
4129 * are not included in the operators that can create a
4130 * constant expression."
4132 * Section 12.43 (Sequence operator and constant expressions) says:
4134 * "Should the following construct be allowed?
4138 * The expression within the brackets uses the sequence operator
4139 * (',') and returns the integer 3 so the construct is declaring
4140 * a single-dimensional array of size 3. In some languages, the
4141 * construct declares a two-dimensional array. It would be
4142 * preferable to make this construct illegal to avoid confusion.
4144 * One possibility is to change the definition of the sequence
4145 * operator so that it does not return a constant-expression and
4146 * hence cannot be used to declare an array size.
4148 * RESOLUTION: The result of a sequence operator is not a
4149 * constant-expression."
4151 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4152 * contains language almost identical to the section 4.3.3 in the
4153 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4156 ir_constant
*constant_value
= rhs
->constant_expression_value();
4157 if (!constant_value
||
4158 (state
->is_version(430, 300) &&
4159 decl
->initializer
->has_sequence_subexpression())) {
4160 const char *const variable_mode
=
4161 (type
->qualifier
.flags
.q
.constant
)
4163 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4165 /* If ARB_shading_language_420pack is enabled, initializers of
4166 * const-qualified local variables do not have to be constant
4167 * expressions. Const-qualified global variables must still be
4168 * initialized with constant expressions.
4170 if (!state
->has_420pack()
4171 || state
->current_function
== NULL
) {
4172 _mesa_glsl_error(& initializer_loc
, state
,
4173 "initializer of %s variable `%s' must be a "
4174 "constant expression",
4177 if (var
->type
->is_numeric()) {
4178 /* Reduce cascading errors. */
4179 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4180 ? ir_constant::zero(state
, var
->type
) : NULL
;
4184 rhs
= constant_value
;
4185 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4186 ? constant_value
: NULL
;
4189 if (var
->type
->is_numeric()) {
4190 /* Reduce cascading errors. */
4191 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4192 ? ir_constant::zero(state
, var
->type
) : NULL
;
4197 if (rhs
&& !rhs
->type
->is_error()) {
4198 bool temp
= var
->data
.read_only
;
4199 if (type
->qualifier
.flags
.q
.constant
)
4200 var
->data
.read_only
= false;
4202 /* Never emit code to initialize a uniform.
4204 const glsl_type
*initializer_type
;
4205 if (!type
->qualifier
.flags
.q
.uniform
) {
4206 do_assignment(initializer_instructions
, state
,
4211 type
->get_location());
4212 initializer_type
= result
->type
;
4214 initializer_type
= rhs
->type
;
4216 var
->constant_initializer
= rhs
->constant_expression_value();
4217 var
->data
.has_initializer
= true;
4219 /* If the declared variable is an unsized array, it must inherrit
4220 * its full type from the initializer. A declaration such as
4222 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4226 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4228 * The assignment generated in the if-statement (below) will also
4229 * automatically handle this case for non-uniforms.
4231 * If the declared variable is not an array, the types must
4232 * already match exactly. As a result, the type assignment
4233 * here can be done unconditionally. For non-uniforms the call
4234 * to do_assignment can change the type of the initializer (via
4235 * the implicit conversion rules). For uniforms the initializer
4236 * must be a constant expression, and the type of that expression
4237 * was validated above.
4239 var
->type
= initializer_type
;
4241 var
->data
.read_only
= temp
;
4248 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4249 YYLTYPE loc
, ir_variable
*var
,
4250 unsigned num_vertices
,
4252 const char *var_category
)
4254 if (var
->type
->is_unsized_array()) {
4255 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4257 * All geometry shader input unsized array declarations will be
4258 * sized by an earlier input layout qualifier, when present, as per
4259 * the following table.
4261 * Followed by a table mapping each allowed input layout qualifier to
4262 * the corresponding input length.
4264 * Similarly for tessellation control shader outputs.
4266 if (num_vertices
!= 0)
4267 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4270 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4271 * includes the following examples of compile-time errors:
4273 * // code sequence within one shader...
4274 * in vec4 Color1[]; // size unknown
4275 * ...Color1.length()...// illegal, length() unknown
4276 * in vec4 Color2[2]; // size is 2
4277 * ...Color1.length()...// illegal, Color1 still has no size
4278 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4279 * layout(lines) in; // legal, input size is 2, matching
4280 * in vec4 Color4[3]; // illegal, contradicts layout
4283 * To detect the case illustrated by Color3, we verify that the size of
4284 * an explicitly-sized array matches the size of any previously declared
4285 * explicitly-sized array. To detect the case illustrated by Color4, we
4286 * verify that the size of an explicitly-sized array is consistent with
4287 * any previously declared input layout.
4289 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4290 _mesa_glsl_error(&loc
, state
,
4291 "%s size contradicts previously declared layout "
4292 "(size is %u, but layout requires a size of %u)",
4293 var_category
, var
->type
->length
, num_vertices
);
4294 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4295 _mesa_glsl_error(&loc
, state
,
4296 "%s sizes are inconsistent (size is %u, but a "
4297 "previous declaration has size %u)",
4298 var_category
, var
->type
->length
, *size
);
4300 *size
= var
->type
->length
;
4306 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4307 YYLTYPE loc
, ir_variable
*var
)
4309 unsigned num_vertices
= 0;
4311 if (state
->tcs_output_vertices_specified
) {
4312 if (!state
->out_qualifier
->vertices
->
4313 process_qualifier_constant(state
, "vertices",
4314 &num_vertices
, false)) {
4318 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4319 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4320 "GL_MAX_PATCH_VERTICES", num_vertices
);
4325 if (!var
->type
->is_array() && !var
->data
.patch
) {
4326 _mesa_glsl_error(&loc
, state
,
4327 "tessellation control shader outputs must be arrays");
4329 /* To avoid cascading failures, short circuit the checks below. */
4333 if (var
->data
.patch
)
4336 var
->data
.tess_varying_implicit_sized_array
= var
->type
->is_unsized_array();
4338 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4339 &state
->tcs_output_size
,
4340 "tessellation control shader output");
4344 * Do additional processing necessary for tessellation control/evaluation shader
4345 * input declarations. This covers both interface block arrays and bare input
4349 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4350 YYLTYPE loc
, ir_variable
*var
)
4352 if (!var
->type
->is_array() && !var
->data
.patch
) {
4353 _mesa_glsl_error(&loc
, state
,
4354 "per-vertex tessellation shader inputs must be arrays");
4355 /* Avoid cascading failures. */
4359 if (var
->data
.patch
)
4362 /* The ARB_tessellation_shader spec says:
4364 * "Declaring an array size is optional. If no size is specified, it
4365 * will be taken from the implementation-dependent maximum patch size
4366 * (gl_MaxPatchVertices). If a size is specified, it must match the
4367 * maximum patch size; otherwise, a compile or link error will occur."
4369 * This text appears twice, once for TCS inputs, and again for TES inputs.
4371 if (var
->type
->is_unsized_array()) {
4372 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4373 state
->Const
.MaxPatchVertices
);
4374 var
->data
.tess_varying_implicit_sized_array
= true;
4375 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4376 _mesa_glsl_error(&loc
, state
,
4377 "per-vertex tessellation shader input arrays must be "
4378 "sized to gl_MaxPatchVertices (%d).",
4379 state
->Const
.MaxPatchVertices
);
4385 * Do additional processing necessary for geometry shader input declarations
4386 * (this covers both interface blocks arrays and bare input variables).
4389 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4390 YYLTYPE loc
, ir_variable
*var
)
4392 unsigned num_vertices
= 0;
4394 if (state
->gs_input_prim_type_specified
) {
4395 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4398 /* Geometry shader input variables must be arrays. Caller should have
4399 * reported an error for this.
4401 if (!var
->type
->is_array()) {
4402 assert(state
->error
);
4404 /* To avoid cascading failures, short circuit the checks below. */
4408 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4409 &state
->gs_input_size
,
4410 "geometry shader input");
4414 validate_identifier(const char *identifier
, YYLTYPE loc
,
4415 struct _mesa_glsl_parse_state
*state
)
4417 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4419 * "Identifiers starting with "gl_" are reserved for use by
4420 * OpenGL, and may not be declared in a shader as either a
4421 * variable or a function."
4423 if (is_gl_identifier(identifier
)) {
4424 _mesa_glsl_error(&loc
, state
,
4425 "identifier `%s' uses reserved `gl_' prefix",
4427 } else if (strstr(identifier
, "__")) {
4428 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4431 * "In addition, all identifiers containing two
4432 * consecutive underscores (__) are reserved as
4433 * possible future keywords."
4435 * The intention is that names containing __ are reserved for internal
4436 * use by the implementation, and names prefixed with GL_ are reserved
4437 * for use by Khronos. Names simply containing __ are dangerous to use,
4438 * but should be allowed.
4440 * A future version of the GLSL specification will clarify this.
4442 _mesa_glsl_warning(&loc
, state
,
4443 "identifier `%s' uses reserved `__' string",
4449 ast_declarator_list::hir(exec_list
*instructions
,
4450 struct _mesa_glsl_parse_state
*state
)
4453 const struct glsl_type
*decl_type
;
4454 const char *type_name
= NULL
;
4455 ir_rvalue
*result
= NULL
;
4456 YYLTYPE loc
= this->get_location();
4458 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4460 * "To ensure that a particular output variable is invariant, it is
4461 * necessary to use the invariant qualifier. It can either be used to
4462 * qualify a previously declared variable as being invariant
4464 * invariant gl_Position; // make existing gl_Position be invariant"
4466 * In these cases the parser will set the 'invariant' flag in the declarator
4467 * list, and the type will be NULL.
4469 if (this->invariant
) {
4470 assert(this->type
== NULL
);
4472 if (state
->current_function
!= NULL
) {
4473 _mesa_glsl_error(& loc
, state
,
4474 "all uses of `invariant' keyword must be at global "
4478 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4479 assert(decl
->array_specifier
== NULL
);
4480 assert(decl
->initializer
== NULL
);
4482 ir_variable
*const earlier
=
4483 state
->symbols
->get_variable(decl
->identifier
);
4484 if (earlier
== NULL
) {
4485 _mesa_glsl_error(& loc
, state
,
4486 "undeclared variable `%s' cannot be marked "
4487 "invariant", decl
->identifier
);
4488 } else if (!is_varying_var(earlier
, state
->stage
)) {
4489 _mesa_glsl_error(&loc
, state
,
4490 "`%s' cannot be marked invariant; interfaces between "
4491 "shader stages only.", decl
->identifier
);
4492 } else if (earlier
->data
.used
) {
4493 _mesa_glsl_error(& loc
, state
,
4494 "variable `%s' may not be redeclared "
4495 "`invariant' after being used",
4498 earlier
->data
.invariant
= true;
4502 /* Invariant redeclarations do not have r-values.
4507 if (this->precise
) {
4508 assert(this->type
== NULL
);
4510 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4511 assert(decl
->array_specifier
== NULL
);
4512 assert(decl
->initializer
== NULL
);
4514 ir_variable
*const earlier
=
4515 state
->symbols
->get_variable(decl
->identifier
);
4516 if (earlier
== NULL
) {
4517 _mesa_glsl_error(& loc
, state
,
4518 "undeclared variable `%s' cannot be marked "
4519 "precise", decl
->identifier
);
4520 } else if (state
->current_function
!= NULL
&&
4521 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4522 /* Note: we have to check if we're in a function, since
4523 * builtins are treated as having come from another scope.
4525 _mesa_glsl_error(& loc
, state
,
4526 "variable `%s' from an outer scope may not be "
4527 "redeclared `precise' in this scope",
4529 } else if (earlier
->data
.used
) {
4530 _mesa_glsl_error(& loc
, state
,
4531 "variable `%s' may not be redeclared "
4532 "`precise' after being used",
4535 earlier
->data
.precise
= true;
4539 /* Precise redeclarations do not have r-values either. */
4543 assert(this->type
!= NULL
);
4544 assert(!this->invariant
);
4545 assert(!this->precise
);
4547 /* The type specifier may contain a structure definition. Process that
4548 * before any of the variable declarations.
4550 (void) this->type
->specifier
->hir(instructions
, state
);
4552 decl_type
= this->type
->glsl_type(& type_name
, state
);
4554 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4555 * "Buffer variables may only be declared inside interface blocks
4556 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4557 * shader storage blocks. It is a compile-time error to declare buffer
4558 * variables at global scope (outside a block)."
4560 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4561 _mesa_glsl_error(&loc
, state
,
4562 "buffer variables cannot be declared outside "
4563 "interface blocks");
4566 /* An offset-qualified atomic counter declaration sets the default
4567 * offset for the next declaration within the same atomic counter
4570 if (decl_type
&& decl_type
->contains_atomic()) {
4571 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4572 type
->qualifier
.flags
.q
.explicit_offset
) {
4573 unsigned qual_binding
;
4574 unsigned qual_offset
;
4575 if (process_qualifier_constant(state
, &loc
, "binding",
4576 type
->qualifier
.binding
,
4578 && process_qualifier_constant(state
, &loc
, "offset",
4579 type
->qualifier
.offset
,
4581 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4585 ast_type_qualifier allowed_atomic_qual_mask
;
4586 allowed_atomic_qual_mask
.flags
.i
= 0;
4587 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4588 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4589 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4591 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4592 "invalid layout qualifier for",
4596 if (this->declarations
.is_empty()) {
4597 /* If there is no structure involved in the program text, there are two
4598 * possible scenarios:
4600 * - The program text contained something like 'vec4;'. This is an
4601 * empty declaration. It is valid but weird. Emit a warning.
4603 * - The program text contained something like 'S;' and 'S' is not the
4604 * name of a known structure type. This is both invalid and weird.
4607 * - The program text contained something like 'mediump float;'
4608 * when the programmer probably meant 'precision mediump
4609 * float;' Emit a warning with a description of what they
4610 * probably meant to do.
4612 * Note that if decl_type is NULL and there is a structure involved,
4613 * there must have been some sort of error with the structure. In this
4614 * case we assume that an error was already generated on this line of
4615 * code for the structure. There is no need to generate an additional,
4618 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4621 if (decl_type
== NULL
) {
4622 _mesa_glsl_error(&loc
, state
,
4623 "invalid type `%s' in empty declaration",
4626 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4627 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4630 * "... any declaration that leaves the size undefined is
4631 * disallowed as this would add complexity and there are no
4634 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4635 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4636 "or implicitly defined");
4639 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4641 * "The combinations of types and qualifiers that cause
4642 * compile-time or link-time errors are the same whether or not
4643 * the declaration is empty."
4645 validate_array_dimensions(decl_type
, state
, &loc
);
4648 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4649 /* Empty atomic counter declarations are allowed and useful
4650 * to set the default offset qualifier.
4653 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4654 if (this->type
->specifier
->structure
!= NULL
) {
4655 _mesa_glsl_error(&loc
, state
,
4656 "precision qualifiers can't be applied "
4659 static const char *const precision_names
[] = {
4666 _mesa_glsl_warning(&loc
, state
,
4667 "empty declaration with precision "
4668 "qualifier, to set the default precision, "
4669 "use `precision %s %s;'",
4670 precision_names
[this->type
->
4671 qualifier
.precision
],
4674 } else if (this->type
->specifier
->structure
== NULL
) {
4675 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4680 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4681 const struct glsl_type
*var_type
;
4683 const char *identifier
= decl
->identifier
;
4684 /* FINISHME: Emit a warning if a variable declaration shadows a
4685 * FINISHME: declaration at a higher scope.
4688 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4689 if (type_name
!= NULL
) {
4690 _mesa_glsl_error(& loc
, state
,
4691 "invalid type `%s' in declaration of `%s'",
4692 type_name
, decl
->identifier
);
4694 _mesa_glsl_error(& loc
, state
,
4695 "invalid type in declaration of `%s'",
4701 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4705 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4707 _mesa_glsl_error(& loc
, state
,
4708 "invalid type in declaration of `%s'",
4710 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4715 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4718 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4720 /* The 'varying in' and 'varying out' qualifiers can only be used with
4721 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4724 if (this->type
->qualifier
.flags
.q
.varying
) {
4725 if (this->type
->qualifier
.flags
.q
.in
) {
4726 _mesa_glsl_error(& loc
, state
,
4727 "`varying in' qualifier in declaration of "
4728 "`%s' only valid for geometry shaders using "
4729 "ARB_geometry_shader4 or EXT_geometry_shader4",
4731 } else if (this->type
->qualifier
.flags
.q
.out
) {
4732 _mesa_glsl_error(& loc
, state
,
4733 "`varying out' qualifier in declaration of "
4734 "`%s' only valid for geometry shaders using "
4735 "ARB_geometry_shader4 or EXT_geometry_shader4",
4740 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4742 * "Global variables can only use the qualifiers const,
4743 * attribute, uniform, or varying. Only one may be
4746 * Local variables can only use the qualifier const."
4748 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4749 * any extension that adds the 'layout' keyword.
4751 if (!state
->is_version(130, 300)
4752 && !state
->has_explicit_attrib_location()
4753 && !state
->has_separate_shader_objects()
4754 && !state
->ARB_fragment_coord_conventions_enable
) {
4755 if (this->type
->qualifier
.flags
.q
.out
) {
4756 _mesa_glsl_error(& loc
, state
,
4757 "`out' qualifier in declaration of `%s' "
4758 "only valid for function parameters in %s",
4759 decl
->identifier
, state
->get_version_string());
4761 if (this->type
->qualifier
.flags
.q
.in
) {
4762 _mesa_glsl_error(& loc
, state
,
4763 "`in' qualifier in declaration of `%s' "
4764 "only valid for function parameters in %s",
4765 decl
->identifier
, state
->get_version_string());
4767 /* FINISHME: Test for other invalid qualifiers. */
4770 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4772 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4775 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
4776 && (var
->type
->is_numeric() || var
->type
->is_boolean())
4777 && state
->zero_init
) {
4778 const ir_constant_data data
= {0};
4779 var
->data
.has_initializer
= true;
4780 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
4783 if (this->type
->qualifier
.flags
.q
.invariant
) {
4784 if (!is_varying_var(var
, state
->stage
)) {
4785 _mesa_glsl_error(&loc
, state
,
4786 "`%s' cannot be marked invariant; interfaces between "
4787 "shader stages only", var
->name
);
4791 if (state
->current_function
!= NULL
) {
4792 const char *mode
= NULL
;
4793 const char *extra
= "";
4795 /* There is no need to check for 'inout' here because the parser will
4796 * only allow that in function parameter lists.
4798 if (this->type
->qualifier
.flags
.q
.attribute
) {
4800 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4801 mode
= "subroutine uniform";
4802 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4804 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4806 } else if (this->type
->qualifier
.flags
.q
.in
) {
4808 extra
= " or in function parameter list";
4809 } else if (this->type
->qualifier
.flags
.q
.out
) {
4811 extra
= " or in function parameter list";
4815 _mesa_glsl_error(& loc
, state
,
4816 "%s variable `%s' must be declared at "
4818 mode
, var
->name
, extra
);
4820 } else if (var
->data
.mode
== ir_var_shader_in
) {
4821 var
->data
.read_only
= true;
4823 if (state
->stage
== MESA_SHADER_VERTEX
) {
4824 bool error_emitted
= false;
4826 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4828 * "Vertex shader inputs can only be float, floating-point
4829 * vectors, matrices, signed and unsigned integers and integer
4830 * vectors. Vertex shader inputs can also form arrays of these
4831 * types, but not structures."
4833 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4835 * "Vertex shader inputs can only be float, floating-point
4836 * vectors, matrices, signed and unsigned integers and integer
4837 * vectors. They cannot be arrays or structures."
4839 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4841 * "The attribute qualifier can be used only with float,
4842 * floating-point vectors, and matrices. Attribute variables
4843 * cannot be declared as arrays or structures."
4845 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4847 * "Vertex shader inputs can only be float, floating-point
4848 * vectors, matrices, signed and unsigned integers and integer
4849 * vectors. Vertex shader inputs cannot be arrays or
4852 const glsl_type
*check_type
= var
->type
->without_array();
4854 switch (check_type
->base_type
) {
4855 case GLSL_TYPE_FLOAT
:
4857 case GLSL_TYPE_UINT
:
4859 if (state
->is_version(120, 300))
4861 case GLSL_TYPE_DOUBLE
:
4862 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4866 _mesa_glsl_error(& loc
, state
,
4867 "vertex shader input / attribute cannot have "
4869 var
->type
->is_array() ? "array of " : "",
4871 error_emitted
= true;
4874 if (!error_emitted
&& var
->type
->is_array() &&
4875 !state
->check_version(150, 0, &loc
,
4876 "vertex shader input / attribute "
4877 "cannot have array type")) {
4878 error_emitted
= true;
4880 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4881 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4883 * Geometry shader input variables get the per-vertex values
4884 * written out by vertex shader output variables of the same
4885 * names. Since a geometry shader operates on a set of
4886 * vertices, each input varying variable (or input block, see
4887 * interface blocks below) needs to be declared as an array.
4889 if (!var
->type
->is_array()) {
4890 _mesa_glsl_error(&loc
, state
,
4891 "geometry shader inputs must be arrays");
4894 handle_geometry_shader_input_decl(state
, loc
, var
);
4895 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4896 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4898 * It is a compile-time error to declare a fragment shader
4899 * input with, or that contains, any of the following types:
4903 * * An array of arrays
4904 * * An array of structures
4905 * * A structure containing an array
4906 * * A structure containing a structure
4908 if (state
->es_shader
) {
4909 const glsl_type
*check_type
= var
->type
->without_array();
4910 if (check_type
->is_boolean() ||
4911 check_type
->contains_opaque()) {
4912 _mesa_glsl_error(&loc
, state
,
4913 "fragment shader input cannot have type %s",
4916 if (var
->type
->is_array() &&
4917 var
->type
->fields
.array
->is_array()) {
4918 _mesa_glsl_error(&loc
, state
,
4920 "cannot have an array of arrays",
4921 _mesa_shader_stage_to_string(state
->stage
));
4923 if (var
->type
->is_array() &&
4924 var
->type
->fields
.array
->is_record()) {
4925 _mesa_glsl_error(&loc
, state
,
4926 "fragment shader input "
4927 "cannot have an array of structs");
4929 if (var
->type
->is_record()) {
4930 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4931 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4932 var
->type
->fields
.structure
[i
].type
->is_record())
4933 _mesa_glsl_error(&loc
, state
,
4934 "fragement shader input cannot have "
4935 "a struct that contains an "
4940 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4941 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4942 handle_tess_shader_input_decl(state
, loc
, var
);
4944 } else if (var
->data
.mode
== ir_var_shader_out
) {
4945 const glsl_type
*check_type
= var
->type
->without_array();
4947 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4949 * It is a compile-time error to declare a vertex, tessellation
4950 * evaluation, tessellation control, or geometry shader output
4951 * that contains any of the following:
4953 * * A Boolean type (bool, bvec2 ...)
4956 if (check_type
->is_boolean() || check_type
->contains_opaque())
4957 _mesa_glsl_error(&loc
, state
,
4958 "%s shader output cannot have type %s",
4959 _mesa_shader_stage_to_string(state
->stage
),
4962 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4964 * It is a compile-time error to declare a fragment shader output
4965 * that contains any of the following:
4967 * * A Boolean type (bool, bvec2 ...)
4968 * * A double-precision scalar or vector (double, dvec2 ...)
4973 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4974 if (check_type
->is_record() || check_type
->is_matrix())
4975 _mesa_glsl_error(&loc
, state
,
4976 "fragment shader output "
4977 "cannot have struct or matrix type");
4978 switch (check_type
->base_type
) {
4979 case GLSL_TYPE_UINT
:
4981 case GLSL_TYPE_FLOAT
:
4984 _mesa_glsl_error(&loc
, state
,
4985 "fragment shader output cannot have "
4986 "type %s", check_type
->name
);
4990 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4992 * It is a compile-time error to declare a vertex shader output
4993 * with, or that contains, any of the following types:
4997 * * An array of arrays
4998 * * An array of structures
4999 * * A structure containing an array
5000 * * A structure containing a structure
5002 * It is a compile-time error to declare a fragment shader output
5003 * with, or that contains, any of the following types:
5009 * * An array of array
5011 if (state
->es_shader
) {
5012 if (var
->type
->is_array() &&
5013 var
->type
->fields
.array
->is_array()) {
5014 _mesa_glsl_error(&loc
, state
,
5016 "cannot have an array of arrays",
5017 _mesa_shader_stage_to_string(state
->stage
));
5019 if (state
->stage
== MESA_SHADER_VERTEX
) {
5020 if (var
->type
->is_array() &&
5021 var
->type
->fields
.array
->is_record()) {
5022 _mesa_glsl_error(&loc
, state
,
5023 "vertex shader output "
5024 "cannot have an array of structs");
5026 if (var
->type
->is_record()) {
5027 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5028 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5029 var
->type
->fields
.structure
[i
].type
->is_record())
5030 _mesa_glsl_error(&loc
, state
,
5031 "vertex shader output cannot have a "
5032 "struct that contains an "
5039 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5040 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5042 } else if (var
->type
->contains_subroutine()) {
5043 /* declare subroutine uniforms as hidden */
5044 var
->data
.how_declared
= ir_var_hidden
;
5047 /* From section 4.3.4 of the GLSL 4.00 spec:
5048 * "Input variables may not be declared using the patch in qualifier
5049 * in tessellation control or geometry shaders."
5051 * From section 4.3.6 of the GLSL 4.00 spec:
5052 * "It is an error to use patch out in a vertex, tessellation
5053 * evaluation, or geometry shader."
5055 * This doesn't explicitly forbid using them in a fragment shader, but
5056 * that's probably just an oversight.
5058 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5059 && this->type
->qualifier
.flags
.q
.patch
5060 && this->type
->qualifier
.flags
.q
.in
) {
5062 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5063 "tessellation evaluation shader");
5066 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5067 && this->type
->qualifier
.flags
.q
.patch
5068 && this->type
->qualifier
.flags
.q
.out
) {
5070 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5071 "tessellation control shader");
5074 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5076 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5077 state
->check_precision_qualifiers_allowed(&loc
);
5080 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5081 !precision_qualifier_allowed(var
->type
)) {
5082 _mesa_glsl_error(&loc
, state
,
5083 "precision qualifiers apply only to floating point"
5084 ", integer and opaque types");
5087 /* From section 4.1.7 of the GLSL 4.40 spec:
5089 * "[Opaque types] can only be declared as function
5090 * parameters or uniform-qualified variables."
5092 if (var_type
->contains_opaque() &&
5093 !this->type
->qualifier
.flags
.q
.uniform
) {
5094 _mesa_glsl_error(&loc
, state
,
5095 "opaque variables must be declared uniform");
5098 /* Process the initializer and add its instructions to a temporary
5099 * list. This list will be added to the instruction stream (below) after
5100 * the declaration is added. This is done because in some cases (such as
5101 * redeclarations) the declaration may not actually be added to the
5102 * instruction stream.
5104 exec_list initializer_instructions
;
5106 /* Examine var name here since var may get deleted in the next call */
5107 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5109 ir_variable
*earlier
=
5110 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5111 false /* allow_all_redeclarations */);
5112 if (earlier
!= NULL
) {
5114 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
5115 _mesa_glsl_error(&loc
, state
,
5116 "`%s' has already been redeclared using "
5117 "gl_PerVertex", earlier
->name
);
5119 earlier
->data
.how_declared
= ir_var_declared_normally
;
5122 if (decl
->initializer
!= NULL
) {
5123 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
5125 &initializer_instructions
, state
);
5127 validate_array_dimensions(var_type
, state
, &loc
);
5130 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5132 * "It is an error to write to a const variable outside of
5133 * its declaration, so they must be initialized when
5136 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5137 _mesa_glsl_error(& loc
, state
,
5138 "const declaration of `%s' must be initialized",
5142 if (state
->es_shader
) {
5143 const glsl_type
*const t
= (earlier
== NULL
)
5144 ? var
->type
: earlier
->type
;
5146 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5148 * The GL_OES_tessellation_shader spec says about inputs:
5150 * "Declaring an array size is optional. If no size is specified,
5151 * it will be taken from the implementation-dependent maximum
5152 * patch size (gl_MaxPatchVertices)."
5154 * and about TCS outputs:
5156 * "If no size is specified, it will be taken from output patch
5157 * size declared in the shader."
5159 * The GL_OES_geometry_shader spec says:
5161 * "All geometry shader input unsized array declarations will be
5162 * sized by an earlier input primitive layout qualifier, when
5163 * present, as per the following table."
5165 const bool implicitly_sized
=
5166 (var
->data
.mode
== ir_var_shader_in
&&
5167 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5168 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5169 (var
->data
.mode
== ir_var_shader_out
&&
5170 state
->stage
== MESA_SHADER_TESS_CTRL
);
5172 if (t
->is_unsized_array() && !implicitly_sized
)
5173 /* Section 10.17 of the GLSL ES 1.00 specification states that
5174 * unsized array declarations have been removed from the language.
5175 * Arrays that are sized using an initializer are still explicitly
5176 * sized. However, GLSL ES 1.00 does not allow array
5177 * initializers. That is only allowed in GLSL ES 3.00.
5179 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5181 * "An array type can also be formed without specifying a size
5182 * if the definition includes an initializer:
5184 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5185 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5190 _mesa_glsl_error(& loc
, state
,
5191 "unsized array declarations are not allowed in "
5195 /* If the declaration is not a redeclaration, there are a few additional
5196 * semantic checks that must be applied. In addition, variable that was
5197 * created for the declaration should be added to the IR stream.
5199 if (earlier
== NULL
) {
5200 validate_identifier(decl
->identifier
, loc
, state
);
5202 /* Add the variable to the symbol table. Note that the initializer's
5203 * IR was already processed earlier (though it hasn't been emitted
5204 * yet), without the variable in scope.
5206 * This differs from most C-like languages, but it follows the GLSL
5207 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5210 * "Within a declaration, the scope of a name starts immediately
5211 * after the initializer if present or immediately after the name
5212 * being declared if not."
5214 if (!state
->symbols
->add_variable(var
)) {
5215 YYLTYPE loc
= this->get_location();
5216 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5217 "current scope", decl
->identifier
);
5221 /* Push the variable declaration to the top. It means that all the
5222 * variable declarations will appear in a funny last-to-first order,
5223 * but otherwise we run into trouble if a function is prototyped, a
5224 * global var is decled, then the function is defined with usage of
5225 * the global var. See glslparsertest's CorrectModule.frag.
5227 instructions
->push_head(var
);
5230 instructions
->append_list(&initializer_instructions
);
5234 /* Generally, variable declarations do not have r-values. However,
5235 * one is used for the declaration in
5237 * while (bool b = some_condition()) {
5241 * so we return the rvalue from the last seen declaration here.
5248 ast_parameter_declarator::hir(exec_list
*instructions
,
5249 struct _mesa_glsl_parse_state
*state
)
5252 const struct glsl_type
*type
;
5253 const char *name
= NULL
;
5254 YYLTYPE loc
= this->get_location();
5256 type
= this->type
->glsl_type(& name
, state
);
5260 _mesa_glsl_error(& loc
, state
,
5261 "invalid type `%s' in declaration of `%s'",
5262 name
, this->identifier
);
5264 _mesa_glsl_error(& loc
, state
,
5265 "invalid type in declaration of `%s'",
5269 type
= glsl_type::error_type
;
5272 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5274 * "Functions that accept no input arguments need not use void in the
5275 * argument list because prototypes (or definitions) are required and
5276 * therefore there is no ambiguity when an empty argument list "( )" is
5277 * declared. The idiom "(void)" as a parameter list is provided for
5280 * Placing this check here prevents a void parameter being set up
5281 * for a function, which avoids tripping up checks for main taking
5282 * parameters and lookups of an unnamed symbol.
5284 if (type
->is_void()) {
5285 if (this->identifier
!= NULL
)
5286 _mesa_glsl_error(& loc
, state
,
5287 "named parameter cannot have type `void'");
5293 if (formal_parameter
&& (this->identifier
== NULL
)) {
5294 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5298 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5299 * call already handled the "vec4[..] foo" case.
5301 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5303 if (!type
->is_error() && type
->is_unsized_array()) {
5304 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5306 type
= glsl_type::error_type
;
5310 ir_variable
*var
= new(ctx
)
5311 ir_variable(type
, this->identifier
, ir_var_function_in
);
5313 /* Apply any specified qualifiers to the parameter declaration. Note that
5314 * for function parameters the default mode is 'in'.
5316 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5319 /* From section 4.1.7 of the GLSL 4.40 spec:
5321 * "Opaque variables cannot be treated as l-values; hence cannot
5322 * be used as out or inout function parameters, nor can they be
5325 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5326 && type
->contains_opaque()) {
5327 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5328 "contain opaque variables");
5329 type
= glsl_type::error_type
;
5332 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5334 * "When calling a function, expressions that do not evaluate to
5335 * l-values cannot be passed to parameters declared as out or inout."
5337 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5339 * "Other binary or unary expressions, non-dereferenced arrays,
5340 * function names, swizzles with repeated fields, and constants
5341 * cannot be l-values."
5343 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5344 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5346 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5348 && !state
->check_version(120, 100, &loc
,
5349 "arrays cannot be out or inout parameters")) {
5350 type
= glsl_type::error_type
;
5353 instructions
->push_tail(var
);
5355 /* Parameter declarations do not have r-values.
5362 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5364 exec_list
*ir_parameters
,
5365 _mesa_glsl_parse_state
*state
)
5367 ast_parameter_declarator
*void_param
= NULL
;
5370 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5371 param
->formal_parameter
= formal
;
5372 param
->hir(ir_parameters
, state
);
5380 if ((void_param
!= NULL
) && (count
> 1)) {
5381 YYLTYPE loc
= void_param
->get_location();
5383 _mesa_glsl_error(& loc
, state
,
5384 "`void' parameter must be only parameter");
5390 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5392 /* IR invariants disallow function declarations or definitions
5393 * nested within other function definitions. But there is no
5394 * requirement about the relative order of function declarations
5395 * and definitions with respect to one another. So simply insert
5396 * the new ir_function block at the end of the toplevel instruction
5399 state
->toplevel_ir
->push_tail(f
);
5404 ast_function::hir(exec_list
*instructions
,
5405 struct _mesa_glsl_parse_state
*state
)
5408 ir_function
*f
= NULL
;
5409 ir_function_signature
*sig
= NULL
;
5410 exec_list hir_parameters
;
5411 YYLTYPE loc
= this->get_location();
5413 const char *const name
= identifier
;
5415 /* New functions are always added to the top-level IR instruction stream,
5416 * so this instruction list pointer is ignored. See also emit_function
5419 (void) instructions
;
5421 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5423 * "Function declarations (prototypes) cannot occur inside of functions;
5424 * they must be at global scope, or for the built-in functions, outside
5425 * the global scope."
5427 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5429 * "User defined functions may only be defined within the global scope."
5431 * Note that this language does not appear in GLSL 1.10.
5433 if ((state
->current_function
!= NULL
) &&
5434 state
->is_version(120, 100)) {
5435 YYLTYPE loc
= this->get_location();
5436 _mesa_glsl_error(&loc
, state
,
5437 "declaration of function `%s' not allowed within "
5438 "function body", name
);
5441 validate_identifier(name
, this->get_location(), state
);
5443 /* Convert the list of function parameters to HIR now so that they can be
5444 * used below to compare this function's signature with previously seen
5445 * signatures for functions with the same name.
5447 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5449 & hir_parameters
, state
);
5451 const char *return_type_name
;
5452 const glsl_type
*return_type
=
5453 this->return_type
->glsl_type(& return_type_name
, state
);
5456 YYLTYPE loc
= this->get_location();
5457 _mesa_glsl_error(&loc
, state
,
5458 "function `%s' has undeclared return type `%s'",
5459 name
, return_type_name
);
5460 return_type
= glsl_type::error_type
;
5463 /* ARB_shader_subroutine states:
5464 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5465 * subroutine(...) to a function declaration."
5467 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5468 YYLTYPE loc
= this->get_location();
5469 _mesa_glsl_error(&loc
, state
,
5470 "function declaration `%s' cannot have subroutine prepended",
5474 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5475 * "No qualifier is allowed on the return type of a function."
5477 if (this->return_type
->has_qualifiers(state
)) {
5478 YYLTYPE loc
= this->get_location();
5479 _mesa_glsl_error(& loc
, state
,
5480 "function `%s' return type has qualifiers", name
);
5483 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5485 * "Arrays are allowed as arguments and as the return type. In both
5486 * cases, the array must be explicitly sized."
5488 if (return_type
->is_unsized_array()) {
5489 YYLTYPE loc
= this->get_location();
5490 _mesa_glsl_error(& loc
, state
,
5491 "function `%s' return type array must be explicitly "
5495 /* From section 4.1.7 of the GLSL 4.40 spec:
5497 * "[Opaque types] can only be declared as function parameters
5498 * or uniform-qualified variables."
5500 if (return_type
->contains_opaque()) {
5501 YYLTYPE loc
= this->get_location();
5502 _mesa_glsl_error(&loc
, state
,
5503 "function `%s' return type can't contain an opaque type",
5508 if (return_type
->is_subroutine()) {
5509 YYLTYPE loc
= this->get_location();
5510 _mesa_glsl_error(&loc
, state
,
5511 "function `%s' return type can't be a subroutine type",
5516 /* Create an ir_function if one doesn't already exist. */
5517 f
= state
->symbols
->get_function(name
);
5519 f
= new(ctx
) ir_function(name
);
5520 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5521 if (!state
->symbols
->add_function(f
)) {
5522 /* This function name shadows a non-function use of the same name. */
5523 YYLTYPE loc
= this->get_location();
5524 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5525 "non-function", name
);
5529 emit_function(state
, f
);
5532 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5534 * "A shader cannot redefine or overload built-in functions."
5536 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5538 * "User code can overload the built-in functions but cannot redefine
5541 if (state
->es_shader
&& state
->language_version
>= 300) {
5542 /* Local shader has no exact candidates; check the built-ins. */
5543 _mesa_glsl_initialize_builtin_functions();
5544 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5545 YYLTYPE loc
= this->get_location();
5546 _mesa_glsl_error(& loc
, state
,
5547 "A shader cannot redefine or overload built-in "
5548 "function `%s' in GLSL ES 3.00", name
);
5553 /* Verify that this function's signature either doesn't match a previously
5554 * seen signature for a function with the same name, or, if a match is found,
5555 * that the previously seen signature does not have an associated definition.
5557 if (state
->es_shader
|| f
->has_user_signature()) {
5558 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5560 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5561 if (badvar
!= NULL
) {
5562 YYLTYPE loc
= this->get_location();
5564 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5565 "qualifiers don't match prototype", name
, badvar
);
5568 if (sig
->return_type
!= return_type
) {
5569 YYLTYPE loc
= this->get_location();
5571 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5572 "match prototype", name
);
5575 if (sig
->is_defined
) {
5576 if (is_definition
) {
5577 YYLTYPE loc
= this->get_location();
5578 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5580 /* We just encountered a prototype that exactly matches a
5581 * function that's already been defined. This is redundant,
5582 * and we should ignore it.
5590 /* Verify the return type of main() */
5591 if (strcmp(name
, "main") == 0) {
5592 if (! return_type
->is_void()) {
5593 YYLTYPE loc
= this->get_location();
5595 _mesa_glsl_error(& loc
, state
, "main() must return void");
5598 if (!hir_parameters
.is_empty()) {
5599 YYLTYPE loc
= this->get_location();
5601 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5605 /* Finish storing the information about this new function in its signature.
5608 sig
= new(ctx
) ir_function_signature(return_type
);
5609 f
->add_signature(sig
);
5612 sig
->replace_parameters(&hir_parameters
);
5615 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5618 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5619 unsigned qual_index
;
5620 if (process_qualifier_constant(state
, &loc
, "index",
5621 this->return_type
->qualifier
.index
,
5623 if (!state
->has_explicit_uniform_location()) {
5624 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5625 "GL_ARB_explicit_uniform_location or "
5627 } else if (qual_index
>= MAX_SUBROUTINES
) {
5628 _mesa_glsl_error(&loc
, state
,
5629 "invalid subroutine index (%d) index must "
5630 "be a number between 0 and "
5631 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5632 MAX_SUBROUTINES
- 1);
5634 f
->subroutine_index
= qual_index
;
5639 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5640 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5641 f
->num_subroutine_types
);
5643 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5644 const struct glsl_type
*type
;
5645 /* the subroutine type must be already declared */
5646 type
= state
->symbols
->get_type(decl
->identifier
);
5648 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5651 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5652 ir_function
*fn
= state
->subroutine_types
[i
];
5653 ir_function_signature
*tsig
= NULL
;
5655 if (strcmp(fn
->name
, decl
->identifier
))
5658 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5661 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5663 if (tsig
->return_type
!= sig
->return_type
) {
5664 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5668 f
->subroutine_types
[idx
++] = type
;
5670 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5672 state
->num_subroutines
+ 1);
5673 state
->subroutines
[state
->num_subroutines
] = f
;
5674 state
->num_subroutines
++;
5678 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5679 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5680 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5683 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5685 state
->num_subroutine_types
+ 1);
5686 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5687 state
->num_subroutine_types
++;
5689 f
->is_subroutine
= true;
5692 /* Function declarations (prototypes) do not have r-values.
5699 ast_function_definition::hir(exec_list
*instructions
,
5700 struct _mesa_glsl_parse_state
*state
)
5702 prototype
->is_definition
= true;
5703 prototype
->hir(instructions
, state
);
5705 ir_function_signature
*signature
= prototype
->signature
;
5706 if (signature
== NULL
)
5709 assert(state
->current_function
== NULL
);
5710 state
->current_function
= signature
;
5711 state
->found_return
= false;
5713 /* Duplicate parameters declared in the prototype as concrete variables.
5714 * Add these to the symbol table.
5716 state
->symbols
->push_scope();
5717 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5718 assert(var
->as_variable() != NULL
);
5720 /* The only way a parameter would "exist" is if two parameters have
5723 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5724 YYLTYPE loc
= this->get_location();
5726 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5728 state
->symbols
->add_variable(var
);
5732 /* Convert the body of the function to HIR. */
5733 this->body
->hir(&signature
->body
, state
);
5734 signature
->is_defined
= true;
5736 state
->symbols
->pop_scope();
5738 assert(state
->current_function
== signature
);
5739 state
->current_function
= NULL
;
5741 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5742 YYLTYPE loc
= this->get_location();
5743 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5744 "%s, but no return statement",
5745 signature
->function_name(),
5746 signature
->return_type
->name
);
5749 /* Function definitions do not have r-values.
5756 ast_jump_statement::hir(exec_list
*instructions
,
5757 struct _mesa_glsl_parse_state
*state
)
5764 assert(state
->current_function
);
5766 if (opt_return_value
) {
5767 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5769 /* The value of the return type can be NULL if the shader says
5770 * 'return foo();' and foo() is a function that returns void.
5772 * NOTE: The GLSL spec doesn't say that this is an error. The type
5773 * of the return value is void. If the return type of the function is
5774 * also void, then this should compile without error. Seriously.
5776 const glsl_type
*const ret_type
=
5777 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5779 /* Implicit conversions are not allowed for return values prior to
5780 * ARB_shading_language_420pack.
5782 if (state
->current_function
->return_type
!= ret_type
) {
5783 YYLTYPE loc
= this->get_location();
5785 if (state
->has_420pack()) {
5786 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5788 _mesa_glsl_error(& loc
, state
,
5789 "could not implicitly convert return value "
5790 "to %s, in function `%s'",
5791 state
->current_function
->return_type
->name
,
5792 state
->current_function
->function_name());
5795 _mesa_glsl_error(& loc
, state
,
5796 "`return' with wrong type %s, in function `%s' "
5799 state
->current_function
->function_name(),
5800 state
->current_function
->return_type
->name
);
5802 } else if (state
->current_function
->return_type
->base_type
==
5804 YYLTYPE loc
= this->get_location();
5806 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5807 * specs add a clarification:
5809 * "A void function can only use return without a return argument, even if
5810 * the return argument has void type. Return statements only accept values:
5813 * void func2() { return func1(); } // illegal return statement"
5815 _mesa_glsl_error(& loc
, state
,
5816 "void functions can only use `return' without a "
5820 inst
= new(ctx
) ir_return(ret
);
5822 if (state
->current_function
->return_type
->base_type
!=
5824 YYLTYPE loc
= this->get_location();
5826 _mesa_glsl_error(& loc
, state
,
5827 "`return' with no value, in function %s returning "
5829 state
->current_function
->function_name());
5831 inst
= new(ctx
) ir_return
;
5834 state
->found_return
= true;
5835 instructions
->push_tail(inst
);
5840 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5841 YYLTYPE loc
= this->get_location();
5843 _mesa_glsl_error(& loc
, state
,
5844 "`discard' may only appear in a fragment shader");
5846 instructions
->push_tail(new(ctx
) ir_discard
);
5851 if (mode
== ast_continue
&&
5852 state
->loop_nesting_ast
== NULL
) {
5853 YYLTYPE loc
= this->get_location();
5855 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5856 } else if (mode
== ast_break
&&
5857 state
->loop_nesting_ast
== NULL
&&
5858 state
->switch_state
.switch_nesting_ast
== NULL
) {
5859 YYLTYPE loc
= this->get_location();
5861 _mesa_glsl_error(& loc
, state
,
5862 "break may only appear in a loop or a switch");
5864 /* For a loop, inline the for loop expression again, since we don't
5865 * know where near the end of the loop body the normal copy of it is
5866 * going to be placed. Same goes for the condition for a do-while
5869 if (state
->loop_nesting_ast
!= NULL
&&
5870 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5871 if (state
->loop_nesting_ast
->rest_expression
) {
5872 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5875 if (state
->loop_nesting_ast
->mode
==
5876 ast_iteration_statement::ast_do_while
) {
5877 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5881 if (state
->switch_state
.is_switch_innermost
&&
5882 mode
== ast_continue
) {
5883 /* Set 'continue_inside' to true. */
5884 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5885 ir_dereference_variable
*deref_continue_inside_var
=
5886 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5887 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5890 /* Break out from the switch, continue for the loop will
5891 * be called right after switch. */
5892 ir_loop_jump
*const jump
=
5893 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5894 instructions
->push_tail(jump
);
5896 } else if (state
->switch_state
.is_switch_innermost
&&
5897 mode
== ast_break
) {
5898 /* Force break out of switch by inserting a break. */
5899 ir_loop_jump
*const jump
=
5900 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5901 instructions
->push_tail(jump
);
5903 ir_loop_jump
*const jump
=
5904 new(ctx
) ir_loop_jump((mode
== ast_break
)
5905 ? ir_loop_jump::jump_break
5906 : ir_loop_jump::jump_continue
);
5907 instructions
->push_tail(jump
);
5914 /* Jump instructions do not have r-values.
5921 ast_selection_statement::hir(exec_list
*instructions
,
5922 struct _mesa_glsl_parse_state
*state
)
5926 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5928 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5930 * "Any expression whose type evaluates to a Boolean can be used as the
5931 * conditional expression bool-expression. Vector types are not accepted
5932 * as the expression to if."
5934 * The checks are separated so that higher quality diagnostics can be
5935 * generated for cases where both rules are violated.
5937 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5938 YYLTYPE loc
= this->condition
->get_location();
5940 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5944 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5946 if (then_statement
!= NULL
) {
5947 state
->symbols
->push_scope();
5948 then_statement
->hir(& stmt
->then_instructions
, state
);
5949 state
->symbols
->pop_scope();
5952 if (else_statement
!= NULL
) {
5953 state
->symbols
->push_scope();
5954 else_statement
->hir(& stmt
->else_instructions
, state
);
5955 state
->symbols
->pop_scope();
5958 instructions
->push_tail(stmt
);
5960 /* if-statements do not have r-values.
5966 /* Used for detection of duplicate case values, compare
5967 * given contents directly.
5970 compare_case_value(const void *a
, const void *b
)
5972 return *(unsigned *) a
== *(unsigned *) b
;
5976 /* Used for detection of duplicate case values, just
5977 * returns key contents as is.
5980 key_contents(const void *key
)
5982 return *(unsigned *) key
;
5987 ast_switch_statement::hir(exec_list
*instructions
,
5988 struct _mesa_glsl_parse_state
*state
)
5992 ir_rvalue
*const test_expression
=
5993 this->test_expression
->hir(instructions
, state
);
5995 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5997 * "The type of init-expression in a switch statement must be a
6000 if (!test_expression
->type
->is_scalar() ||
6001 !test_expression
->type
->is_integer()) {
6002 YYLTYPE loc
= this->test_expression
->get_location();
6004 _mesa_glsl_error(& loc
,
6006 "switch-statement expression must be scalar "
6010 /* Track the switch-statement nesting in a stack-like manner.
6012 struct glsl_switch_state saved
= state
->switch_state
;
6014 state
->switch_state
.is_switch_innermost
= true;
6015 state
->switch_state
.switch_nesting_ast
= this;
6016 state
->switch_state
.labels_ht
=
6017 _mesa_hash_table_create(NULL
, key_contents
,
6018 compare_case_value
);
6019 state
->switch_state
.previous_default
= NULL
;
6021 /* Initalize is_fallthru state to false.
6023 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6024 state
->switch_state
.is_fallthru_var
=
6025 new(ctx
) ir_variable(glsl_type::bool_type
,
6026 "switch_is_fallthru_tmp",
6028 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6030 ir_dereference_variable
*deref_is_fallthru_var
=
6031 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6032 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6035 /* Initialize continue_inside state to false.
6037 state
->switch_state
.continue_inside
=
6038 new(ctx
) ir_variable(glsl_type::bool_type
,
6039 "continue_inside_tmp",
6041 instructions
->push_tail(state
->switch_state
.continue_inside
);
6043 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6044 ir_dereference_variable
*deref_continue_inside_var
=
6045 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6046 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6049 state
->switch_state
.run_default
=
6050 new(ctx
) ir_variable(glsl_type::bool_type
,
6053 instructions
->push_tail(state
->switch_state
.run_default
);
6055 /* Loop around the switch is used for flow control. */
6056 ir_loop
* loop
= new(ctx
) ir_loop();
6057 instructions
->push_tail(loop
);
6059 /* Cache test expression.
6061 test_to_hir(&loop
->body_instructions
, state
);
6063 /* Emit code for body of switch stmt.
6065 body
->hir(&loop
->body_instructions
, state
);
6067 /* Insert a break at the end to exit loop. */
6068 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6069 loop
->body_instructions
.push_tail(jump
);
6071 /* If we are inside loop, check if continue got called inside switch. */
6072 if (state
->loop_nesting_ast
!= NULL
) {
6073 ir_dereference_variable
*deref_continue_inside
=
6074 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6075 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6076 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6078 if (state
->loop_nesting_ast
!= NULL
) {
6079 if (state
->loop_nesting_ast
->rest_expression
) {
6080 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6083 if (state
->loop_nesting_ast
->mode
==
6084 ast_iteration_statement::ast_do_while
) {
6085 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6088 irif
->then_instructions
.push_tail(jump
);
6089 instructions
->push_tail(irif
);
6092 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6094 state
->switch_state
= saved
;
6096 /* Switch statements do not have r-values. */
6102 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6103 struct _mesa_glsl_parse_state
*state
)
6107 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6108 * on the switch test case. The first one would be already raised when
6109 * getting the test_expression at ast_switch_statement::hir
6111 test_expression
->set_is_lhs(true);
6112 /* Cache value of test expression. */
6113 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6115 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6118 ir_dereference_variable
*deref_test_var
=
6119 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6121 instructions
->push_tail(state
->switch_state
.test_var
);
6122 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6127 ast_switch_body::hir(exec_list
*instructions
,
6128 struct _mesa_glsl_parse_state
*state
)
6131 stmts
->hir(instructions
, state
);
6133 /* Switch bodies do not have r-values. */
6138 ast_case_statement_list::hir(exec_list
*instructions
,
6139 struct _mesa_glsl_parse_state
*state
)
6141 exec_list default_case
, after_default
, tmp
;
6143 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6144 case_stmt
->hir(&tmp
, state
);
6147 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6148 default_case
.append_list(&tmp
);
6152 /* If default case found, append 'after_default' list. */
6153 if (!default_case
.is_empty())
6154 after_default
.append_list(&tmp
);
6156 instructions
->append_list(&tmp
);
6159 /* Handle the default case. This is done here because default might not be
6160 * the last case. We need to add checks against following cases first to see
6161 * if default should be chosen or not.
6163 if (!default_case
.is_empty()) {
6165 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6166 ir_dereference_variable
*deref_run_default_var
=
6167 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6169 /* Choose to run default case initially, following conditional
6170 * assignments might change this.
6172 ir_assignment
*const init_var
=
6173 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6174 instructions
->push_tail(init_var
);
6176 /* Default case was the last one, no checks required. */
6177 if (after_default
.is_empty()) {
6178 instructions
->append_list(&default_case
);
6182 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6183 ir_assignment
*assign
= ir
->as_assignment();
6188 /* Clone the check between case label and init expression. */
6189 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6190 ir_expression
*clone
= exp
->clone(state
, NULL
);
6192 ir_dereference_variable
*deref_var
=
6193 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6194 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6196 ir_assignment
*const set_false
=
6197 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6199 instructions
->push_tail(set_false
);
6202 /* Append default case and all cases after it. */
6203 instructions
->append_list(&default_case
);
6204 instructions
->append_list(&after_default
);
6207 /* Case statements do not have r-values. */
6212 ast_case_statement::hir(exec_list
*instructions
,
6213 struct _mesa_glsl_parse_state
*state
)
6215 labels
->hir(instructions
, state
);
6217 /* Guard case statements depending on fallthru state. */
6218 ir_dereference_variable
*const deref_fallthru_guard
=
6219 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6220 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6222 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6223 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6225 instructions
->push_tail(test_fallthru
);
6227 /* Case statements do not have r-values. */
6233 ast_case_label_list::hir(exec_list
*instructions
,
6234 struct _mesa_glsl_parse_state
*state
)
6236 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6237 label
->hir(instructions
, state
);
6239 /* Case labels do not have r-values. */
6244 ast_case_label::hir(exec_list
*instructions
,
6245 struct _mesa_glsl_parse_state
*state
)
6249 ir_dereference_variable
*deref_fallthru_var
=
6250 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6252 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6254 /* If not default case, ... */
6255 if (this->test_value
!= NULL
) {
6256 /* Conditionally set fallthru state based on
6257 * comparison of cached test expression value to case label.
6259 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6260 ir_constant
*label_const
= label_rval
->constant_expression_value();
6263 YYLTYPE loc
= this->test_value
->get_location();
6265 _mesa_glsl_error(& loc
, state
,
6266 "switch statement case label must be a "
6267 "constant expression");
6269 /* Stuff a dummy value in to allow processing to continue. */
6270 label_const
= new(ctx
) ir_constant(0);
6273 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6274 (void *)(uintptr_t)&label_const
->value
.u
[0]);
6277 ast_expression
*previous_label
= (ast_expression
*) entry
->data
;
6278 YYLTYPE loc
= this->test_value
->get_location();
6279 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6281 loc
= previous_label
->get_location();
6282 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6284 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6285 (void *)(uintptr_t)&label_const
->value
.u
[0],
6290 ir_dereference_variable
*deref_test_var
=
6291 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6293 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6298 * From GLSL 4.40 specification section 6.2 ("Selection"):
6300 * "The type of the init-expression value in a switch statement must
6301 * be a scalar int or uint. The type of the constant-expression value
6302 * in a case label also must be a scalar int or uint. When any pair
6303 * of these values is tested for "equal value" and the types do not
6304 * match, an implicit conversion will be done to convert the int to a
6305 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6308 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6309 YYLTYPE loc
= this->test_value
->get_location();
6311 const glsl_type
*type_a
= label_const
->type
;
6312 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6314 /* Check if int->uint implicit conversion is supported. */
6315 bool integer_conversion_supported
=
6316 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6319 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6320 !integer_conversion_supported
) {
6321 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6322 "init-expression and case label (%s != %s)",
6323 type_a
->name
, type_b
->name
);
6325 /* Conversion of the case label. */
6326 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6327 if (!apply_implicit_conversion(glsl_type::uint_type
,
6328 test_cond
->operands
[0], state
))
6329 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6331 /* Conversion of the init-expression value. */
6332 if (!apply_implicit_conversion(glsl_type::uint_type
,
6333 test_cond
->operands
[1], state
))
6334 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6339 ir_assignment
*set_fallthru_on_test
=
6340 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6342 instructions
->push_tail(set_fallthru_on_test
);
6343 } else { /* default case */
6344 if (state
->switch_state
.previous_default
) {
6345 YYLTYPE loc
= this->get_location();
6346 _mesa_glsl_error(& loc
, state
,
6347 "multiple default labels in one switch");
6349 loc
= state
->switch_state
.previous_default
->get_location();
6350 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6352 state
->switch_state
.previous_default
= this;
6354 /* Set fallthru condition on 'run_default' bool. */
6355 ir_dereference_variable
*deref_run_default
=
6356 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6357 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6358 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6362 /* Set falltrhu state. */
6363 ir_assignment
*set_fallthru
=
6364 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6366 instructions
->push_tail(set_fallthru
);
6369 /* Case statements do not have r-values. */
6374 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6375 struct _mesa_glsl_parse_state
*state
)
6379 if (condition
!= NULL
) {
6380 ir_rvalue
*const cond
=
6381 condition
->hir(instructions
, state
);
6384 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6385 YYLTYPE loc
= condition
->get_location();
6387 _mesa_glsl_error(& loc
, state
,
6388 "loop condition must be scalar boolean");
6390 /* As the first code in the loop body, generate a block that looks
6391 * like 'if (!condition) break;' as the loop termination condition.
6393 ir_rvalue
*const not_cond
=
6394 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6396 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6398 ir_jump
*const break_stmt
=
6399 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6401 if_stmt
->then_instructions
.push_tail(break_stmt
);
6402 instructions
->push_tail(if_stmt
);
6409 ast_iteration_statement::hir(exec_list
*instructions
,
6410 struct _mesa_glsl_parse_state
*state
)
6414 /* For-loops and while-loops start a new scope, but do-while loops do not.
6416 if (mode
!= ast_do_while
)
6417 state
->symbols
->push_scope();
6419 if (init_statement
!= NULL
)
6420 init_statement
->hir(instructions
, state
);
6422 ir_loop
*const stmt
= new(ctx
) ir_loop();
6423 instructions
->push_tail(stmt
);
6425 /* Track the current loop nesting. */
6426 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6428 state
->loop_nesting_ast
= this;
6430 /* Likewise, indicate that following code is closest to a loop,
6431 * NOT closest to a switch.
6433 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6434 state
->switch_state
.is_switch_innermost
= false;
6436 if (mode
!= ast_do_while
)
6437 condition_to_hir(&stmt
->body_instructions
, state
);
6440 body
->hir(& stmt
->body_instructions
, state
);
6442 if (rest_expression
!= NULL
)
6443 rest_expression
->hir(& stmt
->body_instructions
, state
);
6445 if (mode
== ast_do_while
)
6446 condition_to_hir(&stmt
->body_instructions
, state
);
6448 if (mode
!= ast_do_while
)
6449 state
->symbols
->pop_scope();
6451 /* Restore previous nesting before returning. */
6452 state
->loop_nesting_ast
= nesting_ast
;
6453 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6455 /* Loops do not have r-values.
6462 * Determine if the given type is valid for establishing a default precision
6465 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6467 * "The precision statement
6469 * precision precision-qualifier type;
6471 * can be used to establish a default precision qualifier. The type field
6472 * can be either int or float or any of the sampler types, and the
6473 * precision-qualifier can be lowp, mediump, or highp."
6475 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6476 * qualifiers on sampler types, but this seems like an oversight (since the
6477 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6478 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6482 is_valid_default_precision_type(const struct glsl_type
*const type
)
6487 switch (type
->base_type
) {
6489 case GLSL_TYPE_FLOAT
:
6490 /* "int" and "float" are valid, but vectors and matrices are not. */
6491 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6492 case GLSL_TYPE_SAMPLER
:
6493 case GLSL_TYPE_IMAGE
:
6494 case GLSL_TYPE_ATOMIC_UINT
:
6503 ast_type_specifier::hir(exec_list
*instructions
,
6504 struct _mesa_glsl_parse_state
*state
)
6506 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6509 YYLTYPE loc
= this->get_location();
6511 /* If this is a precision statement, check that the type to which it is
6512 * applied is either float or int.
6514 * From section 4.5.3 of the GLSL 1.30 spec:
6515 * "The precision statement
6516 * precision precision-qualifier type;
6517 * can be used to establish a default precision qualifier. The type
6518 * field can be either int or float [...]. Any other types or
6519 * qualifiers will result in an error.
6521 if (this->default_precision
!= ast_precision_none
) {
6522 if (!state
->check_precision_qualifiers_allowed(&loc
))
6525 if (this->structure
!= NULL
) {
6526 _mesa_glsl_error(&loc
, state
,
6527 "precision qualifiers do not apply to structures");
6531 if (this->array_specifier
!= NULL
) {
6532 _mesa_glsl_error(&loc
, state
,
6533 "default precision statements do not apply to "
6538 const struct glsl_type
*const type
=
6539 state
->symbols
->get_type(this->type_name
);
6540 if (!is_valid_default_precision_type(type
)) {
6541 _mesa_glsl_error(&loc
, state
,
6542 "default precision statements apply only to "
6543 "float, int, and opaque types");
6547 if (state
->es_shader
) {
6548 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6551 * "Non-precision qualified declarations will use the precision
6552 * qualifier specified in the most recent precision statement
6553 * that is still in scope. The precision statement has the same
6554 * scoping rules as variable declarations. If it is declared
6555 * inside a compound statement, its effect stops at the end of
6556 * the innermost statement it was declared in. Precision
6557 * statements in nested scopes override precision statements in
6558 * outer scopes. Multiple precision statements for the same basic
6559 * type can appear inside the same scope, with later statements
6560 * overriding earlier statements within that scope."
6562 * Default precision specifications follow the same scope rules as
6563 * variables. So, we can track the state of the default precision
6564 * qualifiers in the symbol table, and the rules will just work. This
6565 * is a slight abuse of the symbol table, but it has the semantics
6568 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6569 this->default_precision
);
6572 /* FINISHME: Translate precision statements into IR. */
6576 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6577 * process_record_constructor() can do type-checking on C-style initializer
6578 * expressions of structs, but ast_struct_specifier should only be translated
6579 * to HIR if it is declaring the type of a structure.
6581 * The ->is_declaration field is false for initializers of variables
6582 * declared separately from the struct's type definition.
6584 * struct S { ... }; (is_declaration = true)
6585 * struct T { ... } t = { ... }; (is_declaration = true)
6586 * S s = { ... }; (is_declaration = false)
6588 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6589 return this->structure
->hir(instructions
, state
);
6596 * Process a structure or interface block tree into an array of structure fields
6598 * After parsing, where there are some syntax differnces, structures and
6599 * interface blocks are almost identical. They are similar enough that the
6600 * AST for each can be processed the same way into a set of
6601 * \c glsl_struct_field to describe the members.
6603 * If we're processing an interface block, var_mode should be the type of the
6604 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6605 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6609 * The number of fields processed. A pointer to the array structure fields is
6610 * stored in \c *fields_ret.
6613 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6614 struct _mesa_glsl_parse_state
*state
,
6615 exec_list
*declarations
,
6616 glsl_struct_field
**fields_ret
,
6618 enum glsl_matrix_layout matrix_layout
,
6619 bool allow_reserved_names
,
6620 ir_variable_mode var_mode
,
6621 ast_type_qualifier
*layout
,
6622 unsigned block_stream
,
6623 unsigned block_xfb_buffer
,
6624 unsigned block_xfb_offset
,
6625 unsigned expl_location
,
6626 unsigned expl_align
)
6628 unsigned decl_count
= 0;
6629 unsigned next_offset
= 0;
6631 /* Make an initial pass over the list of fields to determine how
6632 * many there are. Each element in this list is an ast_declarator_list.
6633 * This means that we actually need to count the number of elements in the
6634 * 'declarations' list in each of the elements.
6636 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6637 decl_count
+= decl_list
->declarations
.length();
6640 /* Allocate storage for the fields and process the field
6641 * declarations. As the declarations are processed, try to also convert
6642 * the types to HIR. This ensures that structure definitions embedded in
6643 * other structure definitions or in interface blocks are processed.
6645 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
6648 bool first_member
= true;
6649 bool first_member_has_explicit_location
= false;
6652 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6653 const char *type_name
;
6654 YYLTYPE loc
= decl_list
->get_location();
6656 decl_list
->type
->specifier
->hir(instructions
, state
);
6658 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6660 * "Anonymous structures are not supported; so embedded structures
6661 * must have a declarator. A name given to an embedded struct is
6662 * scoped at the same level as the struct it is embedded in."
6664 * The same section of the GLSL 1.20 spec says:
6666 * "Anonymous structures are not supported. Embedded structures are
6669 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6670 * embedded structures in 1.10 only.
6672 if (state
->language_version
!= 110 &&
6673 decl_list
->type
->specifier
->structure
!= NULL
)
6674 _mesa_glsl_error(&loc
, state
,
6675 "embedded structure declarations are not allowed");
6677 const glsl_type
*decl_type
=
6678 decl_list
->type
->glsl_type(& type_name
, state
);
6680 const struct ast_type_qualifier
*const qual
=
6681 &decl_list
->type
->qualifier
;
6683 /* From section 4.3.9 of the GLSL 4.40 spec:
6685 * "[In interface blocks] opaque types are not allowed."
6687 * It should be impossible for decl_type to be NULL here. Cases that
6688 * might naturally lead to decl_type being NULL, especially for the
6689 * is_interface case, will have resulted in compilation having
6690 * already halted due to a syntax error.
6695 if (decl_type
->contains_opaque()) {
6696 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6697 "interface block contains opaque variable");
6700 if (decl_type
->contains_atomic()) {
6701 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6703 * "Members of structures cannot be declared as atomic counter
6706 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6709 if (decl_type
->contains_image()) {
6710 /* FINISHME: Same problem as with atomic counters.
6711 * FINISHME: Request clarification from Khronos and add
6712 * FINISHME: spec quotation here.
6714 _mesa_glsl_error(&loc
, state
, "image in structure");
6718 if (qual
->flags
.q
.explicit_binding
) {
6719 _mesa_glsl_error(&loc
, state
,
6720 "binding layout qualifier cannot be applied "
6721 "to struct or interface block members");
6725 if (!first_member
) {
6726 if (!layout
->flags
.q
.explicit_location
&&
6727 ((first_member_has_explicit_location
&&
6728 !qual
->flags
.q
.explicit_location
) ||
6729 (!first_member_has_explicit_location
&&
6730 qual
->flags
.q
.explicit_location
))) {
6731 _mesa_glsl_error(&loc
, state
,
6732 "when block-level location layout qualifier "
6733 "is not supplied either all members must "
6734 "have a location layout qualifier or all "
6735 "members must not have a location layout "
6739 first_member
= false;
6740 first_member_has_explicit_location
=
6741 qual
->flags
.q
.explicit_location
;
6745 if (qual
->flags
.q
.std140
||
6746 qual
->flags
.q
.std430
||
6747 qual
->flags
.q
.packed
||
6748 qual
->flags
.q
.shared
) {
6749 _mesa_glsl_error(&loc
, state
,
6750 "uniform/shader storage block layout qualifiers "
6751 "std140, std430, packed, and shared can only be "
6752 "applied to uniform/shader storage blocks, not "
6756 if (qual
->flags
.q
.constant
) {
6757 _mesa_glsl_error(&loc
, state
,
6758 "const storage qualifier cannot be applied "
6759 "to struct or interface block members");
6762 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6764 * "A block member may be declared with a stream identifier, but
6765 * the specified stream must match the stream associated with the
6766 * containing block."
6768 if (qual
->flags
.q
.explicit_stream
) {
6769 unsigned qual_stream
;
6770 if (process_qualifier_constant(state
, &loc
, "stream",
6771 qual
->stream
, &qual_stream
) &&
6772 qual_stream
!= block_stream
) {
6773 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6774 "interface block member does not match "
6775 "the interface block (%u vs %u)", qual_stream
,
6781 unsigned explicit_xfb_buffer
= 0;
6782 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6783 unsigned qual_xfb_buffer
;
6784 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6785 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6786 explicit_xfb_buffer
= 1;
6787 if (qual_xfb_buffer
!= block_xfb_buffer
)
6788 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6789 "interface block member does not match "
6790 "the interface block (%u vs %u)",
6791 qual_xfb_buffer
, block_xfb_buffer
);
6793 xfb_buffer
= (int) qual_xfb_buffer
;
6796 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
6797 xfb_buffer
= (int) block_xfb_buffer
;
6800 int xfb_stride
= -1;
6801 if (qual
->flags
.q
.explicit_xfb_stride
) {
6802 unsigned qual_xfb_stride
;
6803 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6804 qual
->xfb_stride
, &qual_xfb_stride
)) {
6805 xfb_stride
= (int) qual_xfb_stride
;
6809 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6810 _mesa_glsl_error(&loc
, state
,
6811 "interpolation qualifiers cannot be used "
6812 "with uniform interface blocks");
6815 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6816 qual
->has_auxiliary_storage()) {
6817 _mesa_glsl_error(&loc
, state
,
6818 "auxiliary storage qualifiers cannot be used "
6819 "in uniform blocks or structures.");
6822 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6823 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6824 _mesa_glsl_error(&loc
, state
,
6825 "row_major and column_major can only be "
6826 "applied to interface blocks");
6828 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6831 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6832 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6833 "readonly and writeonly.");
6836 foreach_list_typed (ast_declaration
, decl
, link
,
6837 &decl_list
->declarations
) {
6838 YYLTYPE loc
= decl
->get_location();
6840 if (!allow_reserved_names
)
6841 validate_identifier(decl
->identifier
, loc
, state
);
6843 const struct glsl_type
*field_type
=
6844 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6845 validate_array_dimensions(field_type
, state
, &loc
);
6846 fields
[i
].type
= field_type
;
6847 fields
[i
].name
= decl
->identifier
;
6848 fields
[i
].interpolation
=
6849 interpret_interpolation_qualifier(qual
, field_type
,
6850 var_mode
, state
, &loc
);
6851 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6852 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6853 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6854 fields
[i
].precision
= qual
->precision
;
6855 fields
[i
].offset
= -1;
6856 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6857 fields
[i
].xfb_buffer
= xfb_buffer
;
6858 fields
[i
].xfb_stride
= xfb_stride
;
6860 if (qual
->flags
.q
.explicit_location
) {
6861 unsigned qual_location
;
6862 if (process_qualifier_constant(state
, &loc
, "location",
6863 qual
->location
, &qual_location
)) {
6864 fields
[i
].location
= qual_location
+
6865 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
6866 expl_location
= fields
[i
].location
+
6867 fields
[i
].type
->count_attribute_slots(false);
6870 if (layout
&& layout
->flags
.q
.explicit_location
) {
6871 fields
[i
].location
= expl_location
;
6872 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6874 fields
[i
].location
= -1;
6878 /* Offset can only be used with std430 and std140 layouts an initial
6879 * value of 0 is used for error detection.
6885 if (qual
->flags
.q
.row_major
||
6886 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6892 if(layout
->flags
.q
.std140
) {
6893 align
= field_type
->std140_base_alignment(row_major
);
6894 size
= field_type
->std140_size(row_major
);
6895 } else if (layout
->flags
.q
.std430
) {
6896 align
= field_type
->std430_base_alignment(row_major
);
6897 size
= field_type
->std430_size(row_major
);
6901 if (qual
->flags
.q
.explicit_offset
) {
6902 unsigned qual_offset
;
6903 if (process_qualifier_constant(state
, &loc
, "offset",
6904 qual
->offset
, &qual_offset
)) {
6905 if (align
!= 0 && size
!= 0) {
6906 if (next_offset
> qual_offset
)
6907 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6908 "offset overlaps previous member");
6910 if (qual_offset
% align
) {
6911 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6912 "must be a multiple of the base "
6913 "alignment of %s", field_type
->name
);
6915 fields
[i
].offset
= qual_offset
;
6916 next_offset
= glsl_align(qual_offset
+ size
, align
);
6918 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6919 "with std430 and std140 layouts");
6924 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6925 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6927 if (align
== 0 || size
== 0) {
6928 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6929 "std430 and std140 layouts");
6930 } else if (qual
->flags
.q
.explicit_align
) {
6931 unsigned member_align
;
6932 if (process_qualifier_constant(state
, &loc
, "align",
6933 qual
->align
, &member_align
)) {
6934 if (member_align
== 0 ||
6935 member_align
& (member_align
- 1)) {
6936 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6937 "in not a power of 2");
6939 fields
[i
].offset
= glsl_align(offset
, member_align
);
6940 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6944 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6945 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6947 } else if (!qual
->flags
.q
.explicit_offset
) {
6948 if (align
!= 0 && size
!= 0)
6949 next_offset
= glsl_align(next_offset
+ size
, align
);
6952 /* From the ARB_enhanced_layouts spec:
6954 * "The given offset applies to the first component of the first
6955 * member of the qualified entity. Then, within the qualified
6956 * entity, subsequent components are each assigned, in order, to
6957 * the next available offset aligned to a multiple of that
6958 * component's size. Aggregate types are flattened down to the
6959 * component level to get this sequence of components."
6961 if (qual
->flags
.q
.explicit_xfb_offset
) {
6962 unsigned xfb_offset
;
6963 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
6964 qual
->offset
, &xfb_offset
)) {
6965 fields
[i
].offset
= xfb_offset
;
6966 block_xfb_offset
= fields
[i
].offset
+
6967 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6970 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
6971 unsigned align
= field_type
->is_64bit() ? 8 : 4;
6972 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
6974 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6978 /* Propogate row- / column-major information down the fields of the
6979 * structure or interface block. Structures need this data because
6980 * the structure may contain a structure that contains ... a matrix
6981 * that need the proper layout.
6983 if (is_interface
&& layout
&&
6984 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6985 (field_type
->without_array()->is_matrix()
6986 || field_type
->without_array()->is_record())) {
6987 /* If no layout is specified for the field, inherit the layout
6990 fields
[i
].matrix_layout
= matrix_layout
;
6992 if (qual
->flags
.q
.row_major
)
6993 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6994 else if (qual
->flags
.q
.column_major
)
6995 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6997 /* If we're processing an uniform or buffer block, the matrix
6998 * layout must be decided by this point.
7000 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7001 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7004 /* Image qualifiers are allowed on buffer variables, which can only
7005 * be defined inside shader storage buffer objects
7007 if (layout
&& var_mode
== ir_var_shader_storage
) {
7008 /* For readonly and writeonly qualifiers the field definition,
7009 * if set, overwrites the layout qualifier.
7011 if (qual
->flags
.q
.read_only
) {
7012 fields
[i
].image_read_only
= true;
7013 fields
[i
].image_write_only
= false;
7014 } else if (qual
->flags
.q
.write_only
) {
7015 fields
[i
].image_read_only
= false;
7016 fields
[i
].image_write_only
= true;
7018 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
7019 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
7022 /* For other qualifiers, we set the flag if either the layout
7023 * qualifier or the field qualifier are set
7025 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
7026 layout
->flags
.q
.coherent
;
7027 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
7028 layout
->flags
.q
._volatile
;
7029 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
7030 layout
->flags
.q
.restrict_flag
;
7037 assert(i
== decl_count
);
7039 *fields_ret
= fields
;
7045 ast_struct_specifier::hir(exec_list
*instructions
,
7046 struct _mesa_glsl_parse_state
*state
)
7048 YYLTYPE loc
= this->get_location();
7050 unsigned expl_location
= 0;
7051 if (layout
&& layout
->flags
.q
.explicit_location
) {
7052 if (!process_qualifier_constant(state
, &loc
, "location",
7053 layout
->location
, &expl_location
)) {
7056 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7060 glsl_struct_field
*fields
;
7061 unsigned decl_count
=
7062 ast_process_struct_or_iface_block_members(instructions
,
7064 &this->declarations
,
7067 GLSL_MATRIX_LAYOUT_INHERITED
,
7068 false /* allow_reserved_names */,
7071 0, /* for interface only */
7072 0, /* for interface only */
7073 0, /* for interface only */
7075 0 /* for interface only */);
7077 validate_identifier(this->name
, loc
, state
);
7079 const glsl_type
*t
=
7080 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7082 if (!state
->symbols
->add_type(name
, t
)) {
7083 const glsl_type
*match
= state
->symbols
->get_type(name
);
7084 /* allow struct matching for desktop GL - older UE4 does this */
7085 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
7086 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7088 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7090 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7092 state
->num_user_structures
+ 1);
7094 s
[state
->num_user_structures
] = t
;
7095 state
->user_structures
= s
;
7096 state
->num_user_structures
++;
7100 /* Structure type definitions do not have r-values.
7107 * Visitor class which detects whether a given interface block has been used.
7109 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7112 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7113 : mode(mode
), block(block
), found(false)
7117 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7119 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7123 return visit_continue
;
7126 bool usage_found() const
7132 ir_variable_mode mode
;
7133 const glsl_type
*block
;
7138 is_unsized_array_last_element(ir_variable
*v
)
7140 const glsl_type
*interface_type
= v
->get_interface_type();
7141 int length
= interface_type
->length
;
7143 assert(v
->type
->is_unsized_array());
7145 /* Check if it is the last element of the interface */
7146 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7152 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7154 var
->data
.image_read_only
= field
.image_read_only
;
7155 var
->data
.image_write_only
= field
.image_write_only
;
7156 var
->data
.image_coherent
= field
.image_coherent
;
7157 var
->data
.image_volatile
= field
.image_volatile
;
7158 var
->data
.image_restrict
= field
.image_restrict
;
7162 ast_interface_block::hir(exec_list
*instructions
,
7163 struct _mesa_glsl_parse_state
*state
)
7165 YYLTYPE loc
= this->get_location();
7167 /* Interface blocks must be declared at global scope */
7168 if (state
->current_function
!= NULL
) {
7169 _mesa_glsl_error(&loc
, state
,
7170 "Interface block `%s' must be declared "
7175 /* Validate qualifiers:
7177 * - Layout Qualifiers as per the table in Section 4.4
7178 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7180 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7183 * "Additionally, memory qualifiers may also be used in the declaration
7184 * of shader storage blocks"
7186 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7187 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7188 * Layout Qualifiers) of the GLSL 4.50 spec says:
7190 * "The std430 qualifier is supported only for shader storage blocks;
7191 * using std430 on a uniform block will result in a compile-time error."
7193 ast_type_qualifier allowed_blk_qualifiers
;
7194 allowed_blk_qualifiers
.flags
.i
= 0;
7195 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7196 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7197 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7198 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7199 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7200 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7201 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7202 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7203 if (this->layout
.flags
.q
.buffer
) {
7204 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7205 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7206 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7207 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7208 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7209 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7210 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7212 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7215 /* Interface block */
7216 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7218 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7219 if (this->layout
.flags
.q
.out
) {
7220 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7221 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7222 state
->stage
== MESA_SHADER_TESS_CTRL
||
7223 state
->stage
== MESA_SHADER_TESS_EVAL
||
7224 state
->stage
== MESA_SHADER_VERTEX
) {
7225 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7226 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7227 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7228 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7229 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7230 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7231 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7232 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7234 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7235 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7239 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7240 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7241 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7246 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7247 "invalid qualifier for block",
7250 /* The ast_interface_block has a list of ast_declarator_lists. We
7251 * need to turn those into ir_variables with an association
7252 * with this uniform block.
7254 enum glsl_interface_packing packing
;
7255 if (this->layout
.flags
.q
.shared
) {
7256 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7257 } else if (this->layout
.flags
.q
.packed
) {
7258 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7259 } else if (this->layout
.flags
.q
.std430
) {
7260 packing
= GLSL_INTERFACE_PACKING_STD430
;
7262 /* The default layout is std140.
7264 packing
= GLSL_INTERFACE_PACKING_STD140
;
7267 ir_variable_mode var_mode
;
7268 const char *iface_type_name
;
7269 if (this->layout
.flags
.q
.in
) {
7270 var_mode
= ir_var_shader_in
;
7271 iface_type_name
= "in";
7272 } else if (this->layout
.flags
.q
.out
) {
7273 var_mode
= ir_var_shader_out
;
7274 iface_type_name
= "out";
7275 } else if (this->layout
.flags
.q
.uniform
) {
7276 var_mode
= ir_var_uniform
;
7277 iface_type_name
= "uniform";
7278 } else if (this->layout
.flags
.q
.buffer
) {
7279 var_mode
= ir_var_shader_storage
;
7280 iface_type_name
= "buffer";
7282 var_mode
= ir_var_auto
;
7283 iface_type_name
= "UNKNOWN";
7284 assert(!"interface block layout qualifier not found!");
7287 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7288 if (this->layout
.flags
.q
.row_major
)
7289 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7290 else if (this->layout
.flags
.q
.column_major
)
7291 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7293 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7294 exec_list declared_variables
;
7295 glsl_struct_field
*fields
;
7297 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7298 * that we don't have incompatible qualifiers
7300 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7301 _mesa_glsl_error(&loc
, state
,
7302 "Interface block sets both readonly and writeonly");
7305 unsigned qual_stream
;
7306 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7308 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7309 /* If the stream qualifier is invalid it doesn't make sense to continue
7310 * on and try to compare stream layouts on member variables against it
7311 * so just return early.
7316 unsigned qual_xfb_buffer
;
7317 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7318 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7319 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7323 unsigned qual_xfb_offset
;
7324 if (layout
.flags
.q
.explicit_xfb_offset
) {
7325 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7326 layout
.offset
, &qual_xfb_offset
)) {
7331 unsigned qual_xfb_stride
;
7332 if (layout
.flags
.q
.explicit_xfb_stride
) {
7333 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7334 layout
.xfb_stride
, &qual_xfb_stride
)) {
7339 unsigned expl_location
= 0;
7340 if (layout
.flags
.q
.explicit_location
) {
7341 if (!process_qualifier_constant(state
, &loc
, "location",
7342 layout
.location
, &expl_location
)) {
7345 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7346 : VARYING_SLOT_VAR0
;
7350 unsigned expl_align
= 0;
7351 if (layout
.flags
.q
.explicit_align
) {
7352 if (!process_qualifier_constant(state
, &loc
, "align",
7353 layout
.align
, &expl_align
)) {
7356 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7357 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7364 unsigned int num_variables
=
7365 ast_process_struct_or_iface_block_members(&declared_variables
,
7367 &this->declarations
,
7371 redeclaring_per_vertex
,
7380 if (!redeclaring_per_vertex
) {
7381 validate_identifier(this->block_name
, loc
, state
);
7383 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7385 * "Block names have no other use within a shader beyond interface
7386 * matching; it is a compile-time error to use a block name at global
7387 * scope for anything other than as a block name."
7389 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7390 if (var
&& !var
->type
->is_interface()) {
7391 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7392 "already used in the scope.",
7397 const glsl_type
*earlier_per_vertex
= NULL
;
7398 if (redeclaring_per_vertex
) {
7399 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7400 * the named interface block gl_in, we can find it by looking at the
7401 * previous declaration of gl_in. Otherwise we can find it by looking
7402 * at the previous decalartion of any of the built-in outputs,
7405 * Also check that the instance name and array-ness of the redeclaration
7409 case ir_var_shader_in
:
7410 if (ir_variable
*earlier_gl_in
=
7411 state
->symbols
->get_variable("gl_in")) {
7412 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7414 _mesa_glsl_error(&loc
, state
,
7415 "redeclaration of gl_PerVertex input not allowed "
7417 _mesa_shader_stage_to_string(state
->stage
));
7419 if (this->instance_name
== NULL
||
7420 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7421 !this->array_specifier
->is_single_dimension()) {
7422 _mesa_glsl_error(&loc
, state
,
7423 "gl_PerVertex input must be redeclared as "
7427 case ir_var_shader_out
:
7428 if (ir_variable
*earlier_gl_Position
=
7429 state
->symbols
->get_variable("gl_Position")) {
7430 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7431 } else if (ir_variable
*earlier_gl_out
=
7432 state
->symbols
->get_variable("gl_out")) {
7433 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7435 _mesa_glsl_error(&loc
, state
,
7436 "redeclaration of gl_PerVertex output not "
7437 "allowed in the %s shader",
7438 _mesa_shader_stage_to_string(state
->stage
));
7440 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7441 if (this->instance_name
== NULL
||
7442 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7443 _mesa_glsl_error(&loc
, state
,
7444 "gl_PerVertex output must be redeclared as "
7448 if (this->instance_name
!= NULL
) {
7449 _mesa_glsl_error(&loc
, state
,
7450 "gl_PerVertex output may not be redeclared with "
7451 "an instance name");
7456 _mesa_glsl_error(&loc
, state
,
7457 "gl_PerVertex must be declared as an input or an "
7462 if (earlier_per_vertex
== NULL
) {
7463 /* An error has already been reported. Bail out to avoid null
7464 * dereferences later in this function.
7469 /* Copy locations from the old gl_PerVertex interface block. */
7470 for (unsigned i
= 0; i
< num_variables
; i
++) {
7471 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7473 _mesa_glsl_error(&loc
, state
,
7474 "redeclaration of gl_PerVertex must be a subset "
7475 "of the built-in members of gl_PerVertex");
7477 fields
[i
].location
=
7478 earlier_per_vertex
->fields
.structure
[j
].location
;
7480 earlier_per_vertex
->fields
.structure
[j
].offset
;
7481 fields
[i
].interpolation
=
7482 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7483 fields
[i
].centroid
=
7484 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7486 earlier_per_vertex
->fields
.structure
[j
].sample
;
7488 earlier_per_vertex
->fields
.structure
[j
].patch
;
7489 fields
[i
].precision
=
7490 earlier_per_vertex
->fields
.structure
[j
].precision
;
7491 fields
[i
].explicit_xfb_buffer
=
7492 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7493 fields
[i
].xfb_buffer
=
7494 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7495 fields
[i
].xfb_stride
=
7496 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7500 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7503 * If a built-in interface block is redeclared, it must appear in
7504 * the shader before any use of any member included in the built-in
7505 * declaration, or a compilation error will result.
7507 * This appears to be a clarification to the behaviour established for
7508 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7509 * regardless of GLSL version.
7511 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7512 v
.run(instructions
);
7513 if (v
.usage_found()) {
7514 _mesa_glsl_error(&loc
, state
,
7515 "redeclaration of a built-in interface block must "
7516 "appear before any use of any member of the "
7521 const glsl_type
*block_type
=
7522 glsl_type::get_interface_instance(fields
,
7526 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7529 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7531 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7532 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7535 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7536 YYLTYPE loc
= this->get_location();
7537 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7538 "already taken in the current scope",
7539 this->block_name
, iface_type_name
);
7542 /* Since interface blocks cannot contain statements, it should be
7543 * impossible for the block to generate any instructions.
7545 assert(declared_variables
.is_empty());
7547 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7549 * Geometry shader input variables get the per-vertex values written
7550 * out by vertex shader output variables of the same names. Since a
7551 * geometry shader operates on a set of vertices, each input varying
7552 * variable (or input block, see interface blocks below) needs to be
7553 * declared as an array.
7555 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7556 var_mode
== ir_var_shader_in
) {
7557 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7558 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7559 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7560 !this->layout
.flags
.q
.patch
&&
7561 this->array_specifier
== NULL
&&
7562 var_mode
== ir_var_shader_in
) {
7563 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7564 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7565 !this->layout
.flags
.q
.patch
&&
7566 this->array_specifier
== NULL
&&
7567 var_mode
== ir_var_shader_out
) {
7568 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7572 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7575 * "If an instance name (instance-name) is used, then it puts all the
7576 * members inside a scope within its own name space, accessed with the
7577 * field selector ( . ) operator (analogously to structures)."
7579 if (this->instance_name
) {
7580 if (redeclaring_per_vertex
) {
7581 /* When a built-in in an unnamed interface block is redeclared,
7582 * get_variable_being_redeclared() calls
7583 * check_builtin_array_max_size() to make sure that built-in array
7584 * variables aren't redeclared to illegal sizes. But we're looking
7585 * at a redeclaration of a named built-in interface block. So we
7586 * have to manually call check_builtin_array_max_size() for all parts
7587 * of the interface that are arrays.
7589 for (unsigned i
= 0; i
< num_variables
; i
++) {
7590 if (fields
[i
].type
->is_array()) {
7591 const unsigned size
= fields
[i
].type
->array_size();
7592 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7596 validate_identifier(this->instance_name
, loc
, state
);
7601 if (this->array_specifier
!= NULL
) {
7602 const glsl_type
*block_array_type
=
7603 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7605 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7607 * For uniform blocks declared an array, each individual array
7608 * element corresponds to a separate buffer object backing one
7609 * instance of the block. As the array size indicates the number
7610 * of buffer objects needed, uniform block array declarations
7611 * must specify an array size.
7613 * And a few paragraphs later:
7615 * Geometry shader input blocks must be declared as arrays and
7616 * follow the array declaration and linking rules for all
7617 * geometry shader inputs. All other input and output block
7618 * arrays must specify an array size.
7620 * The same applies to tessellation shaders.
7622 * The upshot of this is that the only circumstance where an
7623 * interface array size *doesn't* need to be specified is on a
7624 * geometry shader input, tessellation control shader input,
7625 * tessellation control shader output, and tessellation evaluation
7628 if (block_array_type
->is_unsized_array()) {
7629 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7630 state
->stage
== MESA_SHADER_TESS_CTRL
||
7631 state
->stage
== MESA_SHADER_TESS_EVAL
;
7632 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7634 if (this->layout
.flags
.q
.in
) {
7636 _mesa_glsl_error(&loc
, state
,
7637 "unsized input block arrays not allowed in "
7639 _mesa_shader_stage_to_string(state
->stage
));
7640 } else if (this->layout
.flags
.q
.out
) {
7642 _mesa_glsl_error(&loc
, state
,
7643 "unsized output block arrays not allowed in "
7645 _mesa_shader_stage_to_string(state
->stage
));
7647 /* by elimination, this is a uniform block array */
7648 _mesa_glsl_error(&loc
, state
,
7649 "unsized uniform block arrays not allowed in "
7651 _mesa_shader_stage_to_string(state
->stage
));
7655 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7657 * * Arrays of arrays of blocks are not allowed
7659 if (state
->es_shader
&& block_array_type
->is_array() &&
7660 block_array_type
->fields
.array
->is_array()) {
7661 _mesa_glsl_error(&loc
, state
,
7662 "arrays of arrays interface blocks are "
7666 var
= new(state
) ir_variable(block_array_type
,
7667 this->instance_name
,
7670 var
= new(state
) ir_variable(block_type
,
7671 this->instance_name
,
7675 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7676 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7678 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7679 var
->data
.read_only
= true;
7681 var
->data
.patch
= this->layout
.flags
.q
.patch
;
7683 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7684 handle_geometry_shader_input_decl(state
, loc
, var
);
7685 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7686 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7687 handle_tess_shader_input_decl(state
, loc
, var
);
7688 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7689 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7691 for (unsigned i
= 0; i
< num_variables
; i
++) {
7692 if (var
->data
.mode
== ir_var_shader_storage
)
7693 apply_memory_qualifiers(var
, fields
[i
]);
7696 if (ir_variable
*earlier
=
7697 state
->symbols
->get_variable(this->instance_name
)) {
7698 if (!redeclaring_per_vertex
) {
7699 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7700 this->instance_name
);
7702 earlier
->data
.how_declared
= ir_var_declared_normally
;
7703 earlier
->type
= var
->type
;
7704 earlier
->reinit_interface_type(block_type
);
7707 if (this->layout
.flags
.q
.explicit_binding
) {
7708 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7712 var
->data
.stream
= qual_stream
;
7713 if (layout
.flags
.q
.explicit_location
) {
7714 var
->data
.location
= expl_location
;
7715 var
->data
.explicit_location
= true;
7718 state
->symbols
->add_variable(var
);
7719 instructions
->push_tail(var
);
7722 /* In order to have an array size, the block must also be declared with
7725 assert(this->array_specifier
== NULL
);
7727 for (unsigned i
= 0; i
< num_variables
; i
++) {
7729 new(state
) ir_variable(fields
[i
].type
,
7730 ralloc_strdup(state
, fields
[i
].name
),
7732 var
->data
.interpolation
= fields
[i
].interpolation
;
7733 var
->data
.centroid
= fields
[i
].centroid
;
7734 var
->data
.sample
= fields
[i
].sample
;
7735 var
->data
.patch
= fields
[i
].patch
;
7736 var
->data
.stream
= qual_stream
;
7737 var
->data
.location
= fields
[i
].location
;
7739 if (fields
[i
].location
!= -1)
7740 var
->data
.explicit_location
= true;
7742 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7743 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7745 if (fields
[i
].offset
!= -1)
7746 var
->data
.explicit_xfb_offset
= true;
7747 var
->data
.offset
= fields
[i
].offset
;
7749 var
->init_interface_type(block_type
);
7751 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7752 var
->data
.read_only
= true;
7754 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7755 if (state
->es_shader
) {
7756 var
->data
.precision
=
7757 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7761 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7762 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7763 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7765 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7768 if (var
->data
.mode
== ir_var_shader_storage
)
7769 apply_memory_qualifiers(var
, fields
[i
]);
7771 /* Examine var name here since var may get deleted in the next call */
7772 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7774 if (redeclaring_per_vertex
) {
7775 ir_variable
*earlier
=
7776 get_variable_being_redeclared(var
, loc
, state
,
7777 true /* allow_all_redeclarations */);
7778 if (!var_is_gl_id
|| earlier
== NULL
) {
7779 _mesa_glsl_error(&loc
, state
,
7780 "redeclaration of gl_PerVertex can only "
7781 "include built-in variables");
7782 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7783 _mesa_glsl_error(&loc
, state
,
7784 "`%s' has already been redeclared",
7787 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7788 earlier
->reinit_interface_type(block_type
);
7793 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7794 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7796 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7797 * The UBO declaration itself doesn't get an ir_variable unless it
7798 * has an instance name. This is ugly.
7800 if (this->layout
.flags
.q
.explicit_binding
) {
7801 apply_explicit_binding(state
, &loc
, var
,
7802 var
->get_interface_type(), &this->layout
);
7805 if (var
->type
->is_unsized_array()) {
7806 if (var
->is_in_shader_storage_block()) {
7807 if (is_unsized_array_last_element(var
)) {
7808 var
->data
.from_ssbo_unsized_array
= true;
7811 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7813 * "If an array is declared as the last member of a shader storage
7814 * block and the size is not specified at compile-time, it is
7815 * sized at run-time. In all other cases, arrays are sized only
7818 if (state
->es_shader
) {
7819 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
7820 "definition: only last member of a shader "
7821 "storage block can be defined as unsized "
7822 "array", fields
[i
].name
);
7827 state
->symbols
->add_variable(var
);
7828 instructions
->push_tail(var
);
7831 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7832 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7834 * It is also a compilation error ... to redeclare a built-in
7835 * block and then use a member from that built-in block that was
7836 * not included in the redeclaration.
7838 * This appears to be a clarification to the behaviour established
7839 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7840 * behaviour regardless of GLSL version.
7842 * To prevent the shader from using a member that was not included in
7843 * the redeclaration, we disable any ir_variables that are still
7844 * associated with the old declaration of gl_PerVertex (since we've
7845 * already updated all of the variables contained in the new
7846 * gl_PerVertex to point to it).
7848 * As a side effect this will prevent
7849 * validate_intrastage_interface_blocks() from getting confused and
7850 * thinking there are conflicting definitions of gl_PerVertex in the
7853 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7854 ir_variable
*const var
= node
->as_variable();
7856 var
->get_interface_type() == earlier_per_vertex
&&
7857 var
->data
.mode
== var_mode
) {
7858 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7859 _mesa_glsl_error(&loc
, state
,
7860 "redeclaration of gl_PerVertex cannot "
7861 "follow a redeclaration of `%s'",
7864 state
->symbols
->disable_variable(var
->name
);
7876 ast_tcs_output_layout::hir(exec_list
*instructions
,
7877 struct _mesa_glsl_parse_state
*state
)
7879 YYLTYPE loc
= this->get_location();
7881 unsigned num_vertices
;
7882 if (!state
->out_qualifier
->vertices
->
7883 process_qualifier_constant(state
, "vertices", &num_vertices
,
7885 /* return here to stop cascading incorrect error messages */
7889 /* If any shader outputs occurred before this declaration and specified an
7890 * array size, make sure the size they specified is consistent with the
7893 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7894 _mesa_glsl_error(&loc
, state
,
7895 "this tessellation control shader output layout "
7896 "specifies %u vertices, but a previous output "
7897 "is declared with size %u",
7898 num_vertices
, state
->tcs_output_size
);
7902 state
->tcs_output_vertices_specified
= true;
7904 /* If any shader outputs occurred before this declaration and did not
7905 * specify an array size, their size is determined now.
7907 foreach_in_list (ir_instruction
, node
, instructions
) {
7908 ir_variable
*var
= node
->as_variable();
7909 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7912 /* Note: Not all tessellation control shader output are arrays. */
7913 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7916 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7917 _mesa_glsl_error(&loc
, state
,
7918 "this tessellation control shader output layout "
7919 "specifies %u vertices, but an access to element "
7920 "%u of output `%s' already exists", num_vertices
,
7921 var
->data
.max_array_access
, var
->name
);
7923 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7933 ast_gs_input_layout::hir(exec_list
*instructions
,
7934 struct _mesa_glsl_parse_state
*state
)
7936 YYLTYPE loc
= this->get_location();
7938 /* If any geometry input layout declaration preceded this one, make sure it
7939 * was consistent with this one.
7941 if (state
->gs_input_prim_type_specified
&&
7942 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7943 _mesa_glsl_error(&loc
, state
,
7944 "geometry shader input layout does not match"
7945 " previous declaration");
7949 /* If any shader inputs occurred before this declaration and specified an
7950 * array size, make sure the size they specified is consistent with the
7953 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7954 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7955 _mesa_glsl_error(&loc
, state
,
7956 "this geometry shader input layout implies %u vertices"
7957 " per primitive, but a previous input is declared"
7958 " with size %u", num_vertices
, state
->gs_input_size
);
7962 state
->gs_input_prim_type_specified
= true;
7964 /* If any shader inputs 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_in
)
7972 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7976 if (var
->type
->is_unsized_array()) {
7977 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7978 _mesa_glsl_error(&loc
, state
,
7979 "this geometry shader input layout implies %u"
7980 " vertices, but an access to element %u of input"
7981 " `%s' already exists", num_vertices
,
7982 var
->data
.max_array_access
, var
->name
);
7984 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7995 ast_cs_input_layout::hir(exec_list
*instructions
,
7996 struct _mesa_glsl_parse_state
*state
)
7998 YYLTYPE loc
= this->get_location();
8000 /* From the ARB_compute_shader specification:
8002 * If the local size of the shader in any dimension is greater
8003 * than the maximum size supported by the implementation for that
8004 * dimension, a compile-time error results.
8006 * It is not clear from the spec how the error should be reported if
8007 * the total size of the work group exceeds
8008 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8009 * report it at compile time as well.
8011 GLuint64 total_invocations
= 1;
8012 unsigned qual_local_size
[3];
8013 for (int i
= 0; i
< 3; i
++) {
8015 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8017 /* Infer a local_size of 1 for unspecified dimensions */
8018 if (this->local_size
[i
] == NULL
) {
8019 qual_local_size
[i
] = 1;
8020 } else if (!this->local_size
[i
]->
8021 process_qualifier_constant(state
, local_size_str
,
8022 &qual_local_size
[i
], false)) {
8023 ralloc_free(local_size_str
);
8026 ralloc_free(local_size_str
);
8028 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8029 _mesa_glsl_error(&loc
, state
,
8030 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8032 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8035 total_invocations
*= qual_local_size
[i
];
8036 if (total_invocations
>
8037 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8038 _mesa_glsl_error(&loc
, state
,
8039 "product of local_sizes exceeds "
8040 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8041 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8046 /* If any compute input layout declaration preceded this one, make sure it
8047 * was consistent with this one.
8049 if (state
->cs_input_local_size_specified
) {
8050 for (int i
= 0; i
< 3; i
++) {
8051 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8052 _mesa_glsl_error(&loc
, state
,
8053 "compute shader input layout does not match"
8054 " previous declaration");
8060 /* The ARB_compute_variable_group_size spec says:
8062 * If a compute shader including a *local_size_variable* qualifier also
8063 * declares a fixed local group size using the *local_size_x*,
8064 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8067 if (state
->cs_input_local_size_variable_specified
) {
8068 _mesa_glsl_error(&loc
, state
,
8069 "compute shader can't include both a variable and a "
8070 "fixed local group size");
8074 state
->cs_input_local_size_specified
= true;
8075 for (int i
= 0; i
< 3; i
++)
8076 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8078 /* We may now declare the built-in constant gl_WorkGroupSize (see
8079 * builtin_variable_generator::generate_constants() for why we didn't
8080 * declare it earlier).
8082 ir_variable
*var
= new(state
->symbols
)
8083 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8084 var
->data
.how_declared
= ir_var_declared_implicitly
;
8085 var
->data
.read_only
= true;
8086 instructions
->push_tail(var
);
8087 state
->symbols
->add_variable(var
);
8088 ir_constant_data data
;
8089 memset(&data
, 0, sizeof(data
));
8090 for (int i
= 0; i
< 3; i
++)
8091 data
.u
[i
] = qual_local_size
[i
];
8092 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8093 var
->constant_initializer
=
8094 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8095 var
->data
.has_initializer
= true;
8102 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8103 exec_list
*instructions
)
8105 bool gl_FragColor_assigned
= false;
8106 bool gl_FragData_assigned
= false;
8107 bool gl_FragSecondaryColor_assigned
= false;
8108 bool gl_FragSecondaryData_assigned
= false;
8109 bool user_defined_fs_output_assigned
= false;
8110 ir_variable
*user_defined_fs_output
= NULL
;
8112 /* It would be nice to have proper location information. */
8114 memset(&loc
, 0, sizeof(loc
));
8116 foreach_in_list(ir_instruction
, node
, instructions
) {
8117 ir_variable
*var
= node
->as_variable();
8119 if (!var
|| !var
->data
.assigned
)
8122 if (strcmp(var
->name
, "gl_FragColor") == 0)
8123 gl_FragColor_assigned
= true;
8124 else if (strcmp(var
->name
, "gl_FragData") == 0)
8125 gl_FragData_assigned
= true;
8126 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8127 gl_FragSecondaryColor_assigned
= true;
8128 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8129 gl_FragSecondaryData_assigned
= true;
8130 else if (!is_gl_identifier(var
->name
)) {
8131 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8132 var
->data
.mode
== ir_var_shader_out
) {
8133 user_defined_fs_output_assigned
= true;
8134 user_defined_fs_output
= var
;
8139 /* From the GLSL 1.30 spec:
8141 * "If a shader statically assigns a value to gl_FragColor, it
8142 * may not assign a value to any element of gl_FragData. If a
8143 * shader statically writes a value to any element of
8144 * gl_FragData, it may not assign a value to
8145 * gl_FragColor. That is, a shader may assign values to either
8146 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8147 * linked together must also consistently write just one of
8148 * these variables. Similarly, if user declared output
8149 * variables are in use (statically assigned to), then the
8150 * built-in variables gl_FragColor and gl_FragData may not be
8151 * assigned to. These incorrect usages all generate compile
8154 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8155 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8156 "`gl_FragColor' and `gl_FragData'");
8157 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8158 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8159 "`gl_FragColor' and `%s'",
8160 user_defined_fs_output
->name
);
8161 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8162 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8163 "`gl_FragSecondaryColorEXT' and"
8164 " `gl_FragSecondaryDataEXT'");
8165 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8166 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8167 "`gl_FragColor' and"
8168 " `gl_FragSecondaryDataEXT'");
8169 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8170 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8172 " `gl_FragSecondaryColorEXT'");
8173 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8174 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8175 "`gl_FragData' and `%s'",
8176 user_defined_fs_output
->name
);
8179 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8180 !state
->EXT_blend_func_extended_enable
) {
8181 _mesa_glsl_error(&loc
, state
,
8182 "Dual source blending requires EXT_blend_func_extended");
8188 remove_per_vertex_blocks(exec_list
*instructions
,
8189 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8191 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8192 * if it exists in this shader type.
8194 const glsl_type
*per_vertex
= NULL
;
8196 case ir_var_shader_in
:
8197 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8198 per_vertex
= gl_in
->get_interface_type();
8200 case ir_var_shader_out
:
8201 if (ir_variable
*gl_Position
=
8202 state
->symbols
->get_variable("gl_Position")) {
8203 per_vertex
= gl_Position
->get_interface_type();
8207 assert(!"Unexpected mode");
8211 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8212 * need to do anything.
8214 if (per_vertex
== NULL
)
8217 /* If the interface block is used by the shader, then we don't need to do
8220 interface_block_usage_visitor
v(mode
, per_vertex
);
8221 v
.run(instructions
);
8222 if (v
.usage_found())
8225 /* Remove any ir_variable declarations that refer to the interface block
8228 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8229 ir_variable
*const var
= node
->as_variable();
8230 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8231 var
->data
.mode
== mode
) {
8232 state
->symbols
->disable_variable(var
->name
);