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.");
3636 if (qual
->flags
.q
.inner_coverage
) {
3637 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3638 "valid in fragment shader input layout declaration.");
3641 if (qual
->flags
.q
.post_depth_coverage
) {
3642 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3643 "valid in fragment shader input layout declaration.");
3648 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3650 struct _mesa_glsl_parse_state
*state
,
3654 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3656 if (qual
->flags
.q
.invariant
) {
3657 if (var
->data
.used
) {
3658 _mesa_glsl_error(loc
, state
,
3659 "variable `%s' may not be redeclared "
3660 "`invariant' after being used",
3663 var
->data
.invariant
= 1;
3667 if (qual
->flags
.q
.precise
) {
3668 if (var
->data
.used
) {
3669 _mesa_glsl_error(loc
, state
,
3670 "variable `%s' may not be redeclared "
3671 "`precise' after being used",
3674 var
->data
.precise
= 1;
3678 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3679 _mesa_glsl_error(loc
, state
,
3680 "`subroutine' may only be applied to uniforms, "
3681 "subroutine type declarations, or function definitions");
3684 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3685 || qual
->flags
.q
.uniform
3686 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3687 var
->data
.read_only
= 1;
3689 if (qual
->flags
.q
.centroid
)
3690 var
->data
.centroid
= 1;
3692 if (qual
->flags
.q
.sample
)
3693 var
->data
.sample
= 1;
3695 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3696 if (state
->es_shader
) {
3697 var
->data
.precision
=
3698 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3701 if (qual
->flags
.q
.patch
)
3702 var
->data
.patch
= 1;
3704 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3705 var
->type
= glsl_type::error_type
;
3706 _mesa_glsl_error(loc
, state
,
3707 "`attribute' variables may not be declared in the "
3709 _mesa_shader_stage_to_string(state
->stage
));
3712 /* Disallow layout qualifiers which may only appear on layout declarations. */
3713 if (qual
->flags
.q
.prim_type
) {
3714 _mesa_glsl_error(loc
, state
,
3715 "Primitive type may only be specified on GS input or output "
3716 "layout declaration, not on variables.");
3719 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3721 * "However, the const qualifier cannot be used with out or inout."
3723 * The same section of the GLSL 4.40 spec further clarifies this saying:
3725 * "The const qualifier cannot be used with out or inout, or a
3726 * compile-time error results."
3728 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3729 _mesa_glsl_error(loc
, state
,
3730 "`const' may not be applied to `out' or `inout' "
3731 "function parameters");
3734 /* If there is no qualifier that changes the mode of the variable, leave
3735 * the setting alone.
3737 assert(var
->data
.mode
!= ir_var_temporary
);
3738 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3739 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
3740 else if (qual
->flags
.q
.in
)
3741 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3742 else if (qual
->flags
.q
.attribute
3743 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3744 var
->data
.mode
= ir_var_shader_in
;
3745 else if (qual
->flags
.q
.out
)
3746 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3747 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3748 var
->data
.mode
= ir_var_shader_out
;
3749 else if (qual
->flags
.q
.uniform
)
3750 var
->data
.mode
= ir_var_uniform
;
3751 else if (qual
->flags
.q
.buffer
)
3752 var
->data
.mode
= ir_var_shader_storage
;
3753 else if (qual
->flags
.q
.shared_storage
)
3754 var
->data
.mode
= ir_var_shader_shared
;
3756 var
->data
.fb_fetch_output
= state
->stage
== MESA_SHADER_FRAGMENT
&&
3757 qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
3759 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3760 /* User-defined ins/outs are not permitted in compute shaders. */
3761 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3762 _mesa_glsl_error(loc
, state
,
3763 "user-defined input and output variables are not "
3764 "permitted in compute shaders");
3767 /* This variable is being used to link data between shader stages (in
3768 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3769 * that is allowed for such purposes.
3771 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3773 * "The varying qualifier can be used only with the data types
3774 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3777 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3778 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3780 * "Fragment inputs can only be signed and unsigned integers and
3781 * integer vectors, float, floating-point vectors, matrices, or
3782 * arrays of these. Structures cannot be input.
3784 * Similar text exists in the section on vertex shader outputs.
3786 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3787 * 3.00 spec allows structs as well. Varying structs are also allowed
3790 switch (var
->type
->get_scalar_type()->base_type
) {
3791 case GLSL_TYPE_FLOAT
:
3792 /* Ok in all GLSL versions */
3794 case GLSL_TYPE_UINT
:
3796 if (state
->is_version(130, 300))
3798 _mesa_glsl_error(loc
, state
,
3799 "varying variables must be of base type float in %s",
3800 state
->get_version_string());
3802 case GLSL_TYPE_STRUCT
:
3803 if (state
->is_version(150, 300))
3805 _mesa_glsl_error(loc
, state
,
3806 "varying variables may not be of type struct");
3808 case GLSL_TYPE_DOUBLE
:
3811 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3816 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3817 switch (state
->stage
) {
3818 case MESA_SHADER_VERTEX
:
3819 if (var
->data
.mode
== ir_var_shader_out
)
3820 var
->data
.invariant
= true;
3822 case MESA_SHADER_TESS_CTRL
:
3823 case MESA_SHADER_TESS_EVAL
:
3824 case MESA_SHADER_GEOMETRY
:
3825 if ((var
->data
.mode
== ir_var_shader_in
)
3826 || (var
->data
.mode
== ir_var_shader_out
))
3827 var
->data
.invariant
= true;
3829 case MESA_SHADER_FRAGMENT
:
3830 if (var
->data
.mode
== ir_var_shader_in
)
3831 var
->data
.invariant
= true;
3833 case MESA_SHADER_COMPUTE
:
3834 /* Invariance isn't meaningful in compute shaders. */
3839 var
->data
.interpolation
=
3840 interpret_interpolation_qualifier(qual
, var
->type
,
3841 (ir_variable_mode
) var
->data
.mode
,
3844 /* Does the declaration use the deprecated 'attribute' or 'varying'
3847 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3848 || qual
->flags
.q
.varying
;
3851 /* Validate auxiliary storage qualifiers */
3853 /* From section 4.3.4 of the GLSL 1.30 spec:
3854 * "It is an error to use centroid in in a vertex shader."
3856 * From section 4.3.4 of the GLSL ES 3.00 spec:
3857 * "It is an error to use centroid in or interpolation qualifiers in
3858 * a vertex shader input."
3861 /* Section 4.3.6 of the GLSL 1.30 specification states:
3862 * "It is an error to use centroid out in a fragment shader."
3864 * The GL_ARB_shading_language_420pack extension specification states:
3865 * "It is an error to use auxiliary storage qualifiers or interpolation
3866 * qualifiers on an output in a fragment shader."
3868 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3869 _mesa_glsl_error(loc
, state
,
3870 "sample qualifier may only be used on `in` or `out` "
3871 "variables between shader stages");
3873 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3874 _mesa_glsl_error(loc
, state
,
3875 "centroid qualifier may only be used with `in', "
3876 "`out' or `varying' variables between shader stages");
3879 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3880 _mesa_glsl_error(loc
, state
,
3881 "the shared storage qualifiers can only be used with "
3885 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3889 * Get the variable that is being redeclared by this declaration
3891 * Semantic checks to verify the validity of the redeclaration are also
3892 * performed. If semantic checks fail, compilation error will be emitted via
3893 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3896 * A pointer to an existing variable in the current scope if the declaration
3897 * is a redeclaration, \c NULL otherwise.
3899 static ir_variable
*
3900 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3901 struct _mesa_glsl_parse_state
*state
,
3902 bool allow_all_redeclarations
)
3904 /* Check if this declaration is actually a re-declaration, either to
3905 * resize an array or add qualifiers to an existing variable.
3907 * This is allowed for variables in the current scope, or when at
3908 * global scope (for built-ins in the implicit outer scope).
3910 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3911 if (earlier
== NULL
||
3912 (state
->current_function
!= NULL
&&
3913 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3918 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3920 * "It is legal to declare an array without a size and then
3921 * later re-declare the same name as an array of the same
3922 * type and specify a size."
3924 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3925 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3926 /* FINISHME: This doesn't match the qualifiers on the two
3927 * FINISHME: declarations. It's not 100% clear whether this is
3928 * FINISHME: required or not.
3931 const int size
= var
->type
->array_size();
3932 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3933 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3934 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3936 earlier
->data
.max_array_access
);
3939 earlier
->type
= var
->type
;
3942 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3943 state
->is_version(150, 0))
3944 && strcmp(var
->name
, "gl_FragCoord") == 0
3945 && earlier
->type
== var
->type
3946 && var
->data
.mode
== ir_var_shader_in
) {
3947 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3950 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3951 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3953 /* According to section 4.3.7 of the GLSL 1.30 spec,
3954 * the following built-in varaibles can be redeclared with an
3955 * interpolation qualifier:
3958 * * gl_FrontSecondaryColor
3959 * * gl_BackSecondaryColor
3961 * * gl_SecondaryColor
3963 } else if (state
->is_version(130, 0)
3964 && (strcmp(var
->name
, "gl_FrontColor") == 0
3965 || strcmp(var
->name
, "gl_BackColor") == 0
3966 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3967 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3968 || strcmp(var
->name
, "gl_Color") == 0
3969 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3970 && earlier
->type
== var
->type
3971 && earlier
->data
.mode
== var
->data
.mode
) {
3972 earlier
->data
.interpolation
= var
->data
.interpolation
;
3974 /* Layout qualifiers for gl_FragDepth. */
3975 } else if ((state
->is_version(420, 0) ||
3976 state
->AMD_conservative_depth_enable
||
3977 state
->ARB_conservative_depth_enable
)
3978 && strcmp(var
->name
, "gl_FragDepth") == 0
3979 && earlier
->type
== var
->type
3980 && earlier
->data
.mode
== var
->data
.mode
) {
3982 /** From the AMD_conservative_depth spec:
3983 * Within any shader, the first redeclarations of gl_FragDepth
3984 * must appear before any use of gl_FragDepth.
3986 if (earlier
->data
.used
) {
3987 _mesa_glsl_error(&loc
, state
,
3988 "the first redeclaration of gl_FragDepth "
3989 "must appear before any use of gl_FragDepth");
3992 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3993 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3994 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3995 _mesa_glsl_error(&loc
, state
,
3996 "gl_FragDepth: depth layout is declared here "
3997 "as '%s, but it was previously declared as "
3999 depth_layout_string(var
->data
.depth_layout
),
4000 depth_layout_string(earlier
->data
.depth_layout
));
4003 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4005 } else if (state
->has_framebuffer_fetch() &&
4006 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4007 var
->type
== earlier
->type
&&
4008 var
->data
.mode
== ir_var_auto
) {
4009 /* According to the EXT_shader_framebuffer_fetch spec:
4011 * "By default, gl_LastFragData is declared with the mediump precision
4012 * qualifier. This can be changed by redeclaring the corresponding
4013 * variables with the desired precision qualifier."
4015 earlier
->data
.precision
= var
->data
.precision
;
4017 } else if (allow_all_redeclarations
) {
4018 if (earlier
->data
.mode
!= var
->data
.mode
) {
4019 _mesa_glsl_error(&loc
, state
,
4020 "redeclaration of `%s' with incorrect qualifiers",
4022 } else if (earlier
->type
!= var
->type
) {
4023 _mesa_glsl_error(&loc
, state
,
4024 "redeclaration of `%s' has incorrect type",
4028 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4035 * Generate the IR for an initializer in a variable declaration
4038 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4039 ast_fully_specified_type
*type
,
4040 exec_list
*initializer_instructions
,
4041 struct _mesa_glsl_parse_state
*state
)
4043 ir_rvalue
*result
= NULL
;
4045 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4047 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4049 * "All uniform variables are read-only and are initialized either
4050 * directly by an application via API commands, or indirectly by
4053 if (var
->data
.mode
== ir_var_uniform
) {
4054 state
->check_version(120, 0, &initializer_loc
,
4055 "cannot initialize uniform %s",
4059 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4061 * "Buffer variables cannot have initializers."
4063 if (var
->data
.mode
== ir_var_shader_storage
) {
4064 _mesa_glsl_error(&initializer_loc
, state
,
4065 "cannot initialize buffer variable %s",
4069 /* From section 4.1.7 of the GLSL 4.40 spec:
4071 * "Opaque variables [...] are initialized only through the
4072 * OpenGL API; they cannot be declared with an initializer in a
4075 if (var
->type
->contains_opaque()) {
4076 _mesa_glsl_error(&initializer_loc
, state
,
4077 "cannot initialize opaque variable %s",
4081 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4082 _mesa_glsl_error(&initializer_loc
, state
,
4083 "cannot initialize %s shader input / %s %s",
4084 _mesa_shader_stage_to_string(state
->stage
),
4085 (state
->stage
== MESA_SHADER_VERTEX
)
4086 ? "attribute" : "varying",
4090 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4091 _mesa_glsl_error(&initializer_loc
, state
,
4092 "cannot initialize %s shader output %s",
4093 _mesa_shader_stage_to_string(state
->stage
),
4097 /* If the initializer is an ast_aggregate_initializer, recursively store
4098 * type information from the LHS into it, so that its hir() function can do
4101 if (decl
->initializer
->oper
== ast_aggregate
)
4102 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4104 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4105 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4107 /* Calculate the constant value if this is a const or uniform
4110 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4112 * "Declarations of globals without a storage qualifier, or with
4113 * just the const qualifier, may include initializers, in which case
4114 * they will be initialized before the first line of main() is
4115 * executed. Such initializers must be a constant expression."
4117 * The same section of the GLSL ES 3.00.4 spec has similar language.
4119 if (type
->qualifier
.flags
.q
.constant
4120 || type
->qualifier
.flags
.q
.uniform
4121 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4122 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4124 if (new_rhs
!= NULL
) {
4127 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4130 * "A constant expression is one of
4134 * - an expression formed by an operator on operands that are
4135 * all constant expressions, including getting an element of
4136 * a constant array, or a field of a constant structure, or
4137 * components of a constant vector. However, the sequence
4138 * operator ( , ) and the assignment operators ( =, +=, ...)
4139 * are not included in the operators that can create a
4140 * constant expression."
4142 * Section 12.43 (Sequence operator and constant expressions) says:
4144 * "Should the following construct be allowed?
4148 * The expression within the brackets uses the sequence operator
4149 * (',') and returns the integer 3 so the construct is declaring
4150 * a single-dimensional array of size 3. In some languages, the
4151 * construct declares a two-dimensional array. It would be
4152 * preferable to make this construct illegal to avoid confusion.
4154 * One possibility is to change the definition of the sequence
4155 * operator so that it does not return a constant-expression and
4156 * hence cannot be used to declare an array size.
4158 * RESOLUTION: The result of a sequence operator is not a
4159 * constant-expression."
4161 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4162 * contains language almost identical to the section 4.3.3 in the
4163 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4166 ir_constant
*constant_value
= rhs
->constant_expression_value();
4167 if (!constant_value
||
4168 (state
->is_version(430, 300) &&
4169 decl
->initializer
->has_sequence_subexpression())) {
4170 const char *const variable_mode
=
4171 (type
->qualifier
.flags
.q
.constant
)
4173 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4175 /* If ARB_shading_language_420pack is enabled, initializers of
4176 * const-qualified local variables do not have to be constant
4177 * expressions. Const-qualified global variables must still be
4178 * initialized with constant expressions.
4180 if (!state
->has_420pack()
4181 || state
->current_function
== NULL
) {
4182 _mesa_glsl_error(& initializer_loc
, state
,
4183 "initializer of %s variable `%s' must be a "
4184 "constant expression",
4187 if (var
->type
->is_numeric()) {
4188 /* Reduce cascading errors. */
4189 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4190 ? ir_constant::zero(state
, var
->type
) : NULL
;
4194 rhs
= constant_value
;
4195 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4196 ? constant_value
: NULL
;
4199 if (var
->type
->is_numeric()) {
4200 /* Reduce cascading errors. */
4201 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4202 ? ir_constant::zero(state
, var
->type
) : NULL
;
4207 if (rhs
&& !rhs
->type
->is_error()) {
4208 bool temp
= var
->data
.read_only
;
4209 if (type
->qualifier
.flags
.q
.constant
)
4210 var
->data
.read_only
= false;
4212 /* Never emit code to initialize a uniform.
4214 const glsl_type
*initializer_type
;
4215 if (!type
->qualifier
.flags
.q
.uniform
) {
4216 do_assignment(initializer_instructions
, state
,
4221 type
->get_location());
4222 initializer_type
= result
->type
;
4224 initializer_type
= rhs
->type
;
4226 var
->constant_initializer
= rhs
->constant_expression_value();
4227 var
->data
.has_initializer
= true;
4229 /* If the declared variable is an unsized array, it must inherrit
4230 * its full type from the initializer. A declaration such as
4232 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4236 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4238 * The assignment generated in the if-statement (below) will also
4239 * automatically handle this case for non-uniforms.
4241 * If the declared variable is not an array, the types must
4242 * already match exactly. As a result, the type assignment
4243 * here can be done unconditionally. For non-uniforms the call
4244 * to do_assignment can change the type of the initializer (via
4245 * the implicit conversion rules). For uniforms the initializer
4246 * must be a constant expression, and the type of that expression
4247 * was validated above.
4249 var
->type
= initializer_type
;
4251 var
->data
.read_only
= temp
;
4258 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4259 YYLTYPE loc
, ir_variable
*var
,
4260 unsigned num_vertices
,
4262 const char *var_category
)
4264 if (var
->type
->is_unsized_array()) {
4265 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4267 * All geometry shader input unsized array declarations will be
4268 * sized by an earlier input layout qualifier, when present, as per
4269 * the following table.
4271 * Followed by a table mapping each allowed input layout qualifier to
4272 * the corresponding input length.
4274 * Similarly for tessellation control shader outputs.
4276 if (num_vertices
!= 0)
4277 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4280 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4281 * includes the following examples of compile-time errors:
4283 * // code sequence within one shader...
4284 * in vec4 Color1[]; // size unknown
4285 * ...Color1.length()...// illegal, length() unknown
4286 * in vec4 Color2[2]; // size is 2
4287 * ...Color1.length()...// illegal, Color1 still has no size
4288 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4289 * layout(lines) in; // legal, input size is 2, matching
4290 * in vec4 Color4[3]; // illegal, contradicts layout
4293 * To detect the case illustrated by Color3, we verify that the size of
4294 * an explicitly-sized array matches the size of any previously declared
4295 * explicitly-sized array. To detect the case illustrated by Color4, we
4296 * verify that the size of an explicitly-sized array is consistent with
4297 * any previously declared input layout.
4299 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4300 _mesa_glsl_error(&loc
, state
,
4301 "%s size contradicts previously declared layout "
4302 "(size is %u, but layout requires a size of %u)",
4303 var_category
, var
->type
->length
, num_vertices
);
4304 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4305 _mesa_glsl_error(&loc
, state
,
4306 "%s sizes are inconsistent (size is %u, but a "
4307 "previous declaration has size %u)",
4308 var_category
, var
->type
->length
, *size
);
4310 *size
= var
->type
->length
;
4316 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4317 YYLTYPE loc
, ir_variable
*var
)
4319 unsigned num_vertices
= 0;
4321 if (state
->tcs_output_vertices_specified
) {
4322 if (!state
->out_qualifier
->vertices
->
4323 process_qualifier_constant(state
, "vertices",
4324 &num_vertices
, false)) {
4328 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4329 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4330 "GL_MAX_PATCH_VERTICES", num_vertices
);
4335 if (!var
->type
->is_array() && !var
->data
.patch
) {
4336 _mesa_glsl_error(&loc
, state
,
4337 "tessellation control shader outputs must be arrays");
4339 /* To avoid cascading failures, short circuit the checks below. */
4343 if (var
->data
.patch
)
4346 var
->data
.tess_varying_implicit_sized_array
= var
->type
->is_unsized_array();
4348 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4349 &state
->tcs_output_size
,
4350 "tessellation control shader output");
4354 * Do additional processing necessary for tessellation control/evaluation shader
4355 * input declarations. This covers both interface block arrays and bare input
4359 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4360 YYLTYPE loc
, ir_variable
*var
)
4362 if (!var
->type
->is_array() && !var
->data
.patch
) {
4363 _mesa_glsl_error(&loc
, state
,
4364 "per-vertex tessellation shader inputs must be arrays");
4365 /* Avoid cascading failures. */
4369 if (var
->data
.patch
)
4372 /* The ARB_tessellation_shader spec says:
4374 * "Declaring an array size is optional. If no size is specified, it
4375 * will be taken from the implementation-dependent maximum patch size
4376 * (gl_MaxPatchVertices). If a size is specified, it must match the
4377 * maximum patch size; otherwise, a compile or link error will occur."
4379 * This text appears twice, once for TCS inputs, and again for TES inputs.
4381 if (var
->type
->is_unsized_array()) {
4382 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4383 state
->Const
.MaxPatchVertices
);
4384 var
->data
.tess_varying_implicit_sized_array
= true;
4385 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4386 _mesa_glsl_error(&loc
, state
,
4387 "per-vertex tessellation shader input arrays must be "
4388 "sized to gl_MaxPatchVertices (%d).",
4389 state
->Const
.MaxPatchVertices
);
4395 * Do additional processing necessary for geometry shader input declarations
4396 * (this covers both interface blocks arrays and bare input variables).
4399 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4400 YYLTYPE loc
, ir_variable
*var
)
4402 unsigned num_vertices
= 0;
4404 if (state
->gs_input_prim_type_specified
) {
4405 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4408 /* Geometry shader input variables must be arrays. Caller should have
4409 * reported an error for this.
4411 if (!var
->type
->is_array()) {
4412 assert(state
->error
);
4414 /* To avoid cascading failures, short circuit the checks below. */
4418 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4419 &state
->gs_input_size
,
4420 "geometry shader input");
4424 validate_identifier(const char *identifier
, YYLTYPE loc
,
4425 struct _mesa_glsl_parse_state
*state
)
4427 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4429 * "Identifiers starting with "gl_" are reserved for use by
4430 * OpenGL, and may not be declared in a shader as either a
4431 * variable or a function."
4433 if (is_gl_identifier(identifier
)) {
4434 _mesa_glsl_error(&loc
, state
,
4435 "identifier `%s' uses reserved `gl_' prefix",
4437 } else if (strstr(identifier
, "__")) {
4438 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4441 * "In addition, all identifiers containing two
4442 * consecutive underscores (__) are reserved as
4443 * possible future keywords."
4445 * The intention is that names containing __ are reserved for internal
4446 * use by the implementation, and names prefixed with GL_ are reserved
4447 * for use by Khronos. Names simply containing __ are dangerous to use,
4448 * but should be allowed.
4450 * A future version of the GLSL specification will clarify this.
4452 _mesa_glsl_warning(&loc
, state
,
4453 "identifier `%s' uses reserved `__' string",
4459 ast_declarator_list::hir(exec_list
*instructions
,
4460 struct _mesa_glsl_parse_state
*state
)
4463 const struct glsl_type
*decl_type
;
4464 const char *type_name
= NULL
;
4465 ir_rvalue
*result
= NULL
;
4466 YYLTYPE loc
= this->get_location();
4468 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4470 * "To ensure that a particular output variable is invariant, it is
4471 * necessary to use the invariant qualifier. It can either be used to
4472 * qualify a previously declared variable as being invariant
4474 * invariant gl_Position; // make existing gl_Position be invariant"
4476 * In these cases the parser will set the 'invariant' flag in the declarator
4477 * list, and the type will be NULL.
4479 if (this->invariant
) {
4480 assert(this->type
== NULL
);
4482 if (state
->current_function
!= NULL
) {
4483 _mesa_glsl_error(& loc
, state
,
4484 "all uses of `invariant' keyword must be at global "
4488 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4489 assert(decl
->array_specifier
== NULL
);
4490 assert(decl
->initializer
== NULL
);
4492 ir_variable
*const earlier
=
4493 state
->symbols
->get_variable(decl
->identifier
);
4494 if (earlier
== NULL
) {
4495 _mesa_glsl_error(& loc
, state
,
4496 "undeclared variable `%s' cannot be marked "
4497 "invariant", decl
->identifier
);
4498 } else if (!is_varying_var(earlier
, state
->stage
)) {
4499 _mesa_glsl_error(&loc
, state
,
4500 "`%s' cannot be marked invariant; interfaces between "
4501 "shader stages only.", decl
->identifier
);
4502 } else if (earlier
->data
.used
) {
4503 _mesa_glsl_error(& loc
, state
,
4504 "variable `%s' may not be redeclared "
4505 "`invariant' after being used",
4508 earlier
->data
.invariant
= true;
4512 /* Invariant redeclarations do not have r-values.
4517 if (this->precise
) {
4518 assert(this->type
== NULL
);
4520 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4521 assert(decl
->array_specifier
== NULL
);
4522 assert(decl
->initializer
== NULL
);
4524 ir_variable
*const earlier
=
4525 state
->symbols
->get_variable(decl
->identifier
);
4526 if (earlier
== NULL
) {
4527 _mesa_glsl_error(& loc
, state
,
4528 "undeclared variable `%s' cannot be marked "
4529 "precise", decl
->identifier
);
4530 } else if (state
->current_function
!= NULL
&&
4531 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4532 /* Note: we have to check if we're in a function, since
4533 * builtins are treated as having come from another scope.
4535 _mesa_glsl_error(& loc
, state
,
4536 "variable `%s' from an outer scope may not be "
4537 "redeclared `precise' in this scope",
4539 } else if (earlier
->data
.used
) {
4540 _mesa_glsl_error(& loc
, state
,
4541 "variable `%s' may not be redeclared "
4542 "`precise' after being used",
4545 earlier
->data
.precise
= true;
4549 /* Precise redeclarations do not have r-values either. */
4553 assert(this->type
!= NULL
);
4554 assert(!this->invariant
);
4555 assert(!this->precise
);
4557 /* The type specifier may contain a structure definition. Process that
4558 * before any of the variable declarations.
4560 (void) this->type
->specifier
->hir(instructions
, state
);
4562 decl_type
= this->type
->glsl_type(& type_name
, state
);
4564 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4565 * "Buffer variables may only be declared inside interface blocks
4566 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4567 * shader storage blocks. It is a compile-time error to declare buffer
4568 * variables at global scope (outside a block)."
4570 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4571 _mesa_glsl_error(&loc
, state
,
4572 "buffer variables cannot be declared outside "
4573 "interface blocks");
4576 /* An offset-qualified atomic counter declaration sets the default
4577 * offset for the next declaration within the same atomic counter
4580 if (decl_type
&& decl_type
->contains_atomic()) {
4581 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4582 type
->qualifier
.flags
.q
.explicit_offset
) {
4583 unsigned qual_binding
;
4584 unsigned qual_offset
;
4585 if (process_qualifier_constant(state
, &loc
, "binding",
4586 type
->qualifier
.binding
,
4588 && process_qualifier_constant(state
, &loc
, "offset",
4589 type
->qualifier
.offset
,
4591 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4595 ast_type_qualifier allowed_atomic_qual_mask
;
4596 allowed_atomic_qual_mask
.flags
.i
= 0;
4597 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4598 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4599 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4601 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4602 "invalid layout qualifier for",
4606 if (this->declarations
.is_empty()) {
4607 /* If there is no structure involved in the program text, there are two
4608 * possible scenarios:
4610 * - The program text contained something like 'vec4;'. This is an
4611 * empty declaration. It is valid but weird. Emit a warning.
4613 * - The program text contained something like 'S;' and 'S' is not the
4614 * name of a known structure type. This is both invalid and weird.
4617 * - The program text contained something like 'mediump float;'
4618 * when the programmer probably meant 'precision mediump
4619 * float;' Emit a warning with a description of what they
4620 * probably meant to do.
4622 * Note that if decl_type is NULL and there is a structure involved,
4623 * there must have been some sort of error with the structure. In this
4624 * case we assume that an error was already generated on this line of
4625 * code for the structure. There is no need to generate an additional,
4628 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4631 if (decl_type
== NULL
) {
4632 _mesa_glsl_error(&loc
, state
,
4633 "invalid type `%s' in empty declaration",
4636 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4637 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4640 * "... any declaration that leaves the size undefined is
4641 * disallowed as this would add complexity and there are no
4644 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4645 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4646 "or implicitly defined");
4649 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4651 * "The combinations of types and qualifiers that cause
4652 * compile-time or link-time errors are the same whether or not
4653 * the declaration is empty."
4655 validate_array_dimensions(decl_type
, state
, &loc
);
4658 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4659 /* Empty atomic counter declarations are allowed and useful
4660 * to set the default offset qualifier.
4663 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4664 if (this->type
->specifier
->structure
!= NULL
) {
4665 _mesa_glsl_error(&loc
, state
,
4666 "precision qualifiers can't be applied "
4669 static const char *const precision_names
[] = {
4676 _mesa_glsl_warning(&loc
, state
,
4677 "empty declaration with precision "
4678 "qualifier, to set the default precision, "
4679 "use `precision %s %s;'",
4680 precision_names
[this->type
->
4681 qualifier
.precision
],
4684 } else if (this->type
->specifier
->structure
== NULL
) {
4685 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4690 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4691 const struct glsl_type
*var_type
;
4693 const char *identifier
= decl
->identifier
;
4694 /* FINISHME: Emit a warning if a variable declaration shadows a
4695 * FINISHME: declaration at a higher scope.
4698 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4699 if (type_name
!= NULL
) {
4700 _mesa_glsl_error(& loc
, state
,
4701 "invalid type `%s' in declaration of `%s'",
4702 type_name
, decl
->identifier
);
4704 _mesa_glsl_error(& loc
, state
,
4705 "invalid type in declaration of `%s'",
4711 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4715 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4717 _mesa_glsl_error(& loc
, state
,
4718 "invalid type in declaration of `%s'",
4720 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4725 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4728 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4730 /* The 'varying in' and 'varying out' qualifiers can only be used with
4731 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4734 if (this->type
->qualifier
.flags
.q
.varying
) {
4735 if (this->type
->qualifier
.flags
.q
.in
) {
4736 _mesa_glsl_error(& loc
, state
,
4737 "`varying in' qualifier in declaration of "
4738 "`%s' only valid for geometry shaders using "
4739 "ARB_geometry_shader4 or EXT_geometry_shader4",
4741 } else if (this->type
->qualifier
.flags
.q
.out
) {
4742 _mesa_glsl_error(& loc
, state
,
4743 "`varying out' qualifier in declaration of "
4744 "`%s' only valid for geometry shaders using "
4745 "ARB_geometry_shader4 or EXT_geometry_shader4",
4750 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4752 * "Global variables can only use the qualifiers const,
4753 * attribute, uniform, or varying. Only one may be
4756 * Local variables can only use the qualifier const."
4758 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4759 * any extension that adds the 'layout' keyword.
4761 if (!state
->is_version(130, 300)
4762 && !state
->has_explicit_attrib_location()
4763 && !state
->has_separate_shader_objects()
4764 && !state
->ARB_fragment_coord_conventions_enable
) {
4765 if (this->type
->qualifier
.flags
.q
.out
) {
4766 _mesa_glsl_error(& loc
, state
,
4767 "`out' qualifier in declaration of `%s' "
4768 "only valid for function parameters in %s",
4769 decl
->identifier
, state
->get_version_string());
4771 if (this->type
->qualifier
.flags
.q
.in
) {
4772 _mesa_glsl_error(& loc
, state
,
4773 "`in' qualifier in declaration of `%s' "
4774 "only valid for function parameters in %s",
4775 decl
->identifier
, state
->get_version_string());
4777 /* FINISHME: Test for other invalid qualifiers. */
4780 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4782 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4785 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
4786 && (var
->type
->is_numeric() || var
->type
->is_boolean())
4787 && state
->zero_init
) {
4788 const ir_constant_data data
= {0};
4789 var
->data
.has_initializer
= true;
4790 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
4793 if (this->type
->qualifier
.flags
.q
.invariant
) {
4794 if (!is_varying_var(var
, state
->stage
)) {
4795 _mesa_glsl_error(&loc
, state
,
4796 "`%s' cannot be marked invariant; interfaces between "
4797 "shader stages only", var
->name
);
4801 if (state
->current_function
!= NULL
) {
4802 const char *mode
= NULL
;
4803 const char *extra
= "";
4805 /* There is no need to check for 'inout' here because the parser will
4806 * only allow that in function parameter lists.
4808 if (this->type
->qualifier
.flags
.q
.attribute
) {
4810 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4811 mode
= "subroutine uniform";
4812 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4814 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4816 } else if (this->type
->qualifier
.flags
.q
.in
) {
4818 extra
= " or in function parameter list";
4819 } else if (this->type
->qualifier
.flags
.q
.out
) {
4821 extra
= " or in function parameter list";
4825 _mesa_glsl_error(& loc
, state
,
4826 "%s variable `%s' must be declared at "
4828 mode
, var
->name
, extra
);
4830 } else if (var
->data
.mode
== ir_var_shader_in
) {
4831 var
->data
.read_only
= true;
4833 if (state
->stage
== MESA_SHADER_VERTEX
) {
4834 bool error_emitted
= false;
4836 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4838 * "Vertex shader inputs can only be float, floating-point
4839 * vectors, matrices, signed and unsigned integers and integer
4840 * vectors. Vertex shader inputs can also form arrays of these
4841 * types, but not structures."
4843 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4845 * "Vertex shader inputs can only be float, floating-point
4846 * vectors, matrices, signed and unsigned integers and integer
4847 * vectors. They cannot be arrays or structures."
4849 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4851 * "The attribute qualifier can be used only with float,
4852 * floating-point vectors, and matrices. Attribute variables
4853 * cannot be declared as arrays or structures."
4855 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4857 * "Vertex shader inputs can only be float, floating-point
4858 * vectors, matrices, signed and unsigned integers and integer
4859 * vectors. Vertex shader inputs cannot be arrays or
4862 const glsl_type
*check_type
= var
->type
->without_array();
4864 switch (check_type
->base_type
) {
4865 case GLSL_TYPE_FLOAT
:
4867 case GLSL_TYPE_UINT
:
4869 if (state
->is_version(120, 300))
4871 case GLSL_TYPE_DOUBLE
:
4872 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4876 _mesa_glsl_error(& loc
, state
,
4877 "vertex shader input / attribute cannot have "
4879 var
->type
->is_array() ? "array of " : "",
4881 error_emitted
= true;
4884 if (!error_emitted
&& var
->type
->is_array() &&
4885 !state
->check_version(150, 0, &loc
,
4886 "vertex shader input / attribute "
4887 "cannot have array type")) {
4888 error_emitted
= true;
4890 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4891 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4893 * Geometry shader input variables get the per-vertex values
4894 * written out by vertex shader output variables of the same
4895 * names. Since a geometry shader operates on a set of
4896 * vertices, each input varying variable (or input block, see
4897 * interface blocks below) needs to be declared as an array.
4899 if (!var
->type
->is_array()) {
4900 _mesa_glsl_error(&loc
, state
,
4901 "geometry shader inputs must be arrays");
4904 handle_geometry_shader_input_decl(state
, loc
, var
);
4905 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4906 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4908 * It is a compile-time error to declare a fragment shader
4909 * input with, or that contains, any of the following types:
4913 * * An array of arrays
4914 * * An array of structures
4915 * * A structure containing an array
4916 * * A structure containing a structure
4918 if (state
->es_shader
) {
4919 const glsl_type
*check_type
= var
->type
->without_array();
4920 if (check_type
->is_boolean() ||
4921 check_type
->contains_opaque()) {
4922 _mesa_glsl_error(&loc
, state
,
4923 "fragment shader input cannot have type %s",
4926 if (var
->type
->is_array() &&
4927 var
->type
->fields
.array
->is_array()) {
4928 _mesa_glsl_error(&loc
, state
,
4930 "cannot have an array of arrays",
4931 _mesa_shader_stage_to_string(state
->stage
));
4933 if (var
->type
->is_array() &&
4934 var
->type
->fields
.array
->is_record()) {
4935 _mesa_glsl_error(&loc
, state
,
4936 "fragment shader input "
4937 "cannot have an array of structs");
4939 if (var
->type
->is_record()) {
4940 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4941 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4942 var
->type
->fields
.structure
[i
].type
->is_record())
4943 _mesa_glsl_error(&loc
, state
,
4944 "fragement shader input cannot have "
4945 "a struct that contains an "
4950 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4951 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4952 handle_tess_shader_input_decl(state
, loc
, var
);
4954 } else if (var
->data
.mode
== ir_var_shader_out
) {
4955 const glsl_type
*check_type
= var
->type
->without_array();
4957 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4959 * It is a compile-time error to declare a vertex, tessellation
4960 * evaluation, tessellation control, or geometry shader output
4961 * that contains any of the following:
4963 * * A Boolean type (bool, bvec2 ...)
4966 if (check_type
->is_boolean() || check_type
->contains_opaque())
4967 _mesa_glsl_error(&loc
, state
,
4968 "%s shader output cannot have type %s",
4969 _mesa_shader_stage_to_string(state
->stage
),
4972 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4974 * It is a compile-time error to declare a fragment shader output
4975 * that contains any of the following:
4977 * * A Boolean type (bool, bvec2 ...)
4978 * * A double-precision scalar or vector (double, dvec2 ...)
4983 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4984 if (check_type
->is_record() || check_type
->is_matrix())
4985 _mesa_glsl_error(&loc
, state
,
4986 "fragment shader output "
4987 "cannot have struct or matrix type");
4988 switch (check_type
->base_type
) {
4989 case GLSL_TYPE_UINT
:
4991 case GLSL_TYPE_FLOAT
:
4994 _mesa_glsl_error(&loc
, state
,
4995 "fragment shader output cannot have "
4996 "type %s", check_type
->name
);
5000 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5002 * It is a compile-time error to declare a vertex shader output
5003 * with, or that contains, any of the following types:
5007 * * An array of arrays
5008 * * An array of structures
5009 * * A structure containing an array
5010 * * A structure containing a structure
5012 * It is a compile-time error to declare a fragment shader output
5013 * with, or that contains, any of the following types:
5019 * * An array of array
5021 if (state
->es_shader
) {
5022 if (var
->type
->is_array() &&
5023 var
->type
->fields
.array
->is_array()) {
5024 _mesa_glsl_error(&loc
, state
,
5026 "cannot have an array of arrays",
5027 _mesa_shader_stage_to_string(state
->stage
));
5029 if (state
->stage
== MESA_SHADER_VERTEX
) {
5030 if (var
->type
->is_array() &&
5031 var
->type
->fields
.array
->is_record()) {
5032 _mesa_glsl_error(&loc
, state
,
5033 "vertex shader output "
5034 "cannot have an array of structs");
5036 if (var
->type
->is_record()) {
5037 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5038 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5039 var
->type
->fields
.structure
[i
].type
->is_record())
5040 _mesa_glsl_error(&loc
, state
,
5041 "vertex shader output cannot have a "
5042 "struct that contains an "
5049 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5050 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5052 } else if (var
->type
->contains_subroutine()) {
5053 /* declare subroutine uniforms as hidden */
5054 var
->data
.how_declared
= ir_var_hidden
;
5057 /* From section 4.3.4 of the GLSL 4.00 spec:
5058 * "Input variables may not be declared using the patch in qualifier
5059 * in tessellation control or geometry shaders."
5061 * From section 4.3.6 of the GLSL 4.00 spec:
5062 * "It is an error to use patch out in a vertex, tessellation
5063 * evaluation, or geometry shader."
5065 * This doesn't explicitly forbid using them in a fragment shader, but
5066 * that's probably just an oversight.
5068 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5069 && this->type
->qualifier
.flags
.q
.patch
5070 && this->type
->qualifier
.flags
.q
.in
) {
5072 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5073 "tessellation evaluation shader");
5076 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5077 && this->type
->qualifier
.flags
.q
.patch
5078 && this->type
->qualifier
.flags
.q
.out
) {
5080 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5081 "tessellation control shader");
5084 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5086 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5087 state
->check_precision_qualifiers_allowed(&loc
);
5090 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5091 !precision_qualifier_allowed(var
->type
)) {
5092 _mesa_glsl_error(&loc
, state
,
5093 "precision qualifiers apply only to floating point"
5094 ", integer and opaque types");
5097 /* From section 4.1.7 of the GLSL 4.40 spec:
5099 * "[Opaque types] can only be declared as function
5100 * parameters or uniform-qualified variables."
5102 if (var_type
->contains_opaque() &&
5103 !this->type
->qualifier
.flags
.q
.uniform
) {
5104 _mesa_glsl_error(&loc
, state
,
5105 "opaque variables must be declared uniform");
5108 /* Process the initializer and add its instructions to a temporary
5109 * list. This list will be added to the instruction stream (below) after
5110 * the declaration is added. This is done because in some cases (such as
5111 * redeclarations) the declaration may not actually be added to the
5112 * instruction stream.
5114 exec_list initializer_instructions
;
5116 /* Examine var name here since var may get deleted in the next call */
5117 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5119 ir_variable
*earlier
=
5120 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5121 false /* allow_all_redeclarations */);
5122 if (earlier
!= NULL
) {
5124 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
5125 _mesa_glsl_error(&loc
, state
,
5126 "`%s' has already been redeclared using "
5127 "gl_PerVertex", earlier
->name
);
5129 earlier
->data
.how_declared
= ir_var_declared_normally
;
5132 if (decl
->initializer
!= NULL
) {
5133 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
5135 &initializer_instructions
, state
);
5137 validate_array_dimensions(var_type
, state
, &loc
);
5140 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5142 * "It is an error to write to a const variable outside of
5143 * its declaration, so they must be initialized when
5146 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5147 _mesa_glsl_error(& loc
, state
,
5148 "const declaration of `%s' must be initialized",
5152 if (state
->es_shader
) {
5153 const glsl_type
*const t
= (earlier
== NULL
)
5154 ? var
->type
: earlier
->type
;
5156 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5158 * The GL_OES_tessellation_shader spec says about inputs:
5160 * "Declaring an array size is optional. If no size is specified,
5161 * it will be taken from the implementation-dependent maximum
5162 * patch size (gl_MaxPatchVertices)."
5164 * and about TCS outputs:
5166 * "If no size is specified, it will be taken from output patch
5167 * size declared in the shader."
5169 * The GL_OES_geometry_shader spec says:
5171 * "All geometry shader input unsized array declarations will be
5172 * sized by an earlier input primitive layout qualifier, when
5173 * present, as per the following table."
5175 const bool implicitly_sized
=
5176 (var
->data
.mode
== ir_var_shader_in
&&
5177 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5178 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5179 (var
->data
.mode
== ir_var_shader_out
&&
5180 state
->stage
== MESA_SHADER_TESS_CTRL
);
5182 if (t
->is_unsized_array() && !implicitly_sized
)
5183 /* Section 10.17 of the GLSL ES 1.00 specification states that
5184 * unsized array declarations have been removed from the language.
5185 * Arrays that are sized using an initializer are still explicitly
5186 * sized. However, GLSL ES 1.00 does not allow array
5187 * initializers. That is only allowed in GLSL ES 3.00.
5189 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5191 * "An array type can also be formed without specifying a size
5192 * if the definition includes an initializer:
5194 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5195 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5200 _mesa_glsl_error(& loc
, state
,
5201 "unsized array declarations are not allowed in "
5205 /* If the declaration is not a redeclaration, there are a few additional
5206 * semantic checks that must be applied. In addition, variable that was
5207 * created for the declaration should be added to the IR stream.
5209 if (earlier
== NULL
) {
5210 validate_identifier(decl
->identifier
, loc
, state
);
5212 /* Add the variable to the symbol table. Note that the initializer's
5213 * IR was already processed earlier (though it hasn't been emitted
5214 * yet), without the variable in scope.
5216 * This differs from most C-like languages, but it follows the GLSL
5217 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5220 * "Within a declaration, the scope of a name starts immediately
5221 * after the initializer if present or immediately after the name
5222 * being declared if not."
5224 if (!state
->symbols
->add_variable(var
)) {
5225 YYLTYPE loc
= this->get_location();
5226 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5227 "current scope", decl
->identifier
);
5231 /* Push the variable declaration to the top. It means that all the
5232 * variable declarations will appear in a funny last-to-first order,
5233 * but otherwise we run into trouble if a function is prototyped, a
5234 * global var is decled, then the function is defined with usage of
5235 * the global var. See glslparsertest's CorrectModule.frag.
5237 instructions
->push_head(var
);
5240 instructions
->append_list(&initializer_instructions
);
5244 /* Generally, variable declarations do not have r-values. However,
5245 * one is used for the declaration in
5247 * while (bool b = some_condition()) {
5251 * so we return the rvalue from the last seen declaration here.
5258 ast_parameter_declarator::hir(exec_list
*instructions
,
5259 struct _mesa_glsl_parse_state
*state
)
5262 const struct glsl_type
*type
;
5263 const char *name
= NULL
;
5264 YYLTYPE loc
= this->get_location();
5266 type
= this->type
->glsl_type(& name
, state
);
5270 _mesa_glsl_error(& loc
, state
,
5271 "invalid type `%s' in declaration of `%s'",
5272 name
, this->identifier
);
5274 _mesa_glsl_error(& loc
, state
,
5275 "invalid type in declaration of `%s'",
5279 type
= glsl_type::error_type
;
5282 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5284 * "Functions that accept no input arguments need not use void in the
5285 * argument list because prototypes (or definitions) are required and
5286 * therefore there is no ambiguity when an empty argument list "( )" is
5287 * declared. The idiom "(void)" as a parameter list is provided for
5290 * Placing this check here prevents a void parameter being set up
5291 * for a function, which avoids tripping up checks for main taking
5292 * parameters and lookups of an unnamed symbol.
5294 if (type
->is_void()) {
5295 if (this->identifier
!= NULL
)
5296 _mesa_glsl_error(& loc
, state
,
5297 "named parameter cannot have type `void'");
5303 if (formal_parameter
&& (this->identifier
== NULL
)) {
5304 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5308 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5309 * call already handled the "vec4[..] foo" case.
5311 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5313 if (!type
->is_error() && type
->is_unsized_array()) {
5314 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5316 type
= glsl_type::error_type
;
5320 ir_variable
*var
= new(ctx
)
5321 ir_variable(type
, this->identifier
, ir_var_function_in
);
5323 /* Apply any specified qualifiers to the parameter declaration. Note that
5324 * for function parameters the default mode is 'in'.
5326 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5329 /* From section 4.1.7 of the GLSL 4.40 spec:
5331 * "Opaque variables cannot be treated as l-values; hence cannot
5332 * be used as out or inout function parameters, nor can they be
5335 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5336 && type
->contains_opaque()) {
5337 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5338 "contain opaque variables");
5339 type
= glsl_type::error_type
;
5342 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5344 * "When calling a function, expressions that do not evaluate to
5345 * l-values cannot be passed to parameters declared as out or inout."
5347 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5349 * "Other binary or unary expressions, non-dereferenced arrays,
5350 * function names, swizzles with repeated fields, and constants
5351 * cannot be l-values."
5353 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5354 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5356 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5358 && !state
->check_version(120, 100, &loc
,
5359 "arrays cannot be out or inout parameters")) {
5360 type
= glsl_type::error_type
;
5363 instructions
->push_tail(var
);
5365 /* Parameter declarations do not have r-values.
5372 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5374 exec_list
*ir_parameters
,
5375 _mesa_glsl_parse_state
*state
)
5377 ast_parameter_declarator
*void_param
= NULL
;
5380 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5381 param
->formal_parameter
= formal
;
5382 param
->hir(ir_parameters
, state
);
5390 if ((void_param
!= NULL
) && (count
> 1)) {
5391 YYLTYPE loc
= void_param
->get_location();
5393 _mesa_glsl_error(& loc
, state
,
5394 "`void' parameter must be only parameter");
5400 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5402 /* IR invariants disallow function declarations or definitions
5403 * nested within other function definitions. But there is no
5404 * requirement about the relative order of function declarations
5405 * and definitions with respect to one another. So simply insert
5406 * the new ir_function block at the end of the toplevel instruction
5409 state
->toplevel_ir
->push_tail(f
);
5414 ast_function::hir(exec_list
*instructions
,
5415 struct _mesa_glsl_parse_state
*state
)
5418 ir_function
*f
= NULL
;
5419 ir_function_signature
*sig
= NULL
;
5420 exec_list hir_parameters
;
5421 YYLTYPE loc
= this->get_location();
5423 const char *const name
= identifier
;
5425 /* New functions are always added to the top-level IR instruction stream,
5426 * so this instruction list pointer is ignored. See also emit_function
5429 (void) instructions
;
5431 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5433 * "Function declarations (prototypes) cannot occur inside of functions;
5434 * they must be at global scope, or for the built-in functions, outside
5435 * the global scope."
5437 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5439 * "User defined functions may only be defined within the global scope."
5441 * Note that this language does not appear in GLSL 1.10.
5443 if ((state
->current_function
!= NULL
) &&
5444 state
->is_version(120, 100)) {
5445 YYLTYPE loc
= this->get_location();
5446 _mesa_glsl_error(&loc
, state
,
5447 "declaration of function `%s' not allowed within "
5448 "function body", name
);
5451 validate_identifier(name
, this->get_location(), state
);
5453 /* Convert the list of function parameters to HIR now so that they can be
5454 * used below to compare this function's signature with previously seen
5455 * signatures for functions with the same name.
5457 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5459 & hir_parameters
, state
);
5461 const char *return_type_name
;
5462 const glsl_type
*return_type
=
5463 this->return_type
->glsl_type(& return_type_name
, state
);
5466 YYLTYPE loc
= this->get_location();
5467 _mesa_glsl_error(&loc
, state
,
5468 "function `%s' has undeclared return type `%s'",
5469 name
, return_type_name
);
5470 return_type
= glsl_type::error_type
;
5473 /* ARB_shader_subroutine states:
5474 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5475 * subroutine(...) to a function declaration."
5477 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5478 YYLTYPE loc
= this->get_location();
5479 _mesa_glsl_error(&loc
, state
,
5480 "function declaration `%s' cannot have subroutine prepended",
5484 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5485 * "No qualifier is allowed on the return type of a function."
5487 if (this->return_type
->has_qualifiers(state
)) {
5488 YYLTYPE loc
= this->get_location();
5489 _mesa_glsl_error(& loc
, state
,
5490 "function `%s' return type has qualifiers", name
);
5493 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5495 * "Arrays are allowed as arguments and as the return type. In both
5496 * cases, the array must be explicitly sized."
5498 if (return_type
->is_unsized_array()) {
5499 YYLTYPE loc
= this->get_location();
5500 _mesa_glsl_error(& loc
, state
,
5501 "function `%s' return type array must be explicitly "
5505 /* From section 4.1.7 of the GLSL 4.40 spec:
5507 * "[Opaque types] can only be declared as function parameters
5508 * or uniform-qualified variables."
5510 if (return_type
->contains_opaque()) {
5511 YYLTYPE loc
= this->get_location();
5512 _mesa_glsl_error(&loc
, state
,
5513 "function `%s' return type can't contain an opaque type",
5518 if (return_type
->is_subroutine()) {
5519 YYLTYPE loc
= this->get_location();
5520 _mesa_glsl_error(&loc
, state
,
5521 "function `%s' return type can't be a subroutine type",
5526 /* Create an ir_function if one doesn't already exist. */
5527 f
= state
->symbols
->get_function(name
);
5529 f
= new(ctx
) ir_function(name
);
5530 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5531 if (!state
->symbols
->add_function(f
)) {
5532 /* This function name shadows a non-function use of the same name. */
5533 YYLTYPE loc
= this->get_location();
5534 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5535 "non-function", name
);
5539 emit_function(state
, f
);
5542 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5544 * "A shader cannot redefine or overload built-in functions."
5546 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5548 * "User code can overload the built-in functions but cannot redefine
5551 if (state
->es_shader
&& state
->language_version
>= 300) {
5552 /* Local shader has no exact candidates; check the built-ins. */
5553 _mesa_glsl_initialize_builtin_functions();
5554 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5555 YYLTYPE loc
= this->get_location();
5556 _mesa_glsl_error(& loc
, state
,
5557 "A shader cannot redefine or overload built-in "
5558 "function `%s' in GLSL ES 3.00", name
);
5563 /* Verify that this function's signature either doesn't match a previously
5564 * seen signature for a function with the same name, or, if a match is found,
5565 * that the previously seen signature does not have an associated definition.
5567 if (state
->es_shader
|| f
->has_user_signature()) {
5568 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5570 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5571 if (badvar
!= NULL
) {
5572 YYLTYPE loc
= this->get_location();
5574 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5575 "qualifiers don't match prototype", name
, badvar
);
5578 if (sig
->return_type
!= return_type
) {
5579 YYLTYPE loc
= this->get_location();
5581 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5582 "match prototype", name
);
5585 if (sig
->is_defined
) {
5586 if (is_definition
) {
5587 YYLTYPE loc
= this->get_location();
5588 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5590 /* We just encountered a prototype that exactly matches a
5591 * function that's already been defined. This is redundant,
5592 * and we should ignore it.
5600 /* Verify the return type of main() */
5601 if (strcmp(name
, "main") == 0) {
5602 if (! return_type
->is_void()) {
5603 YYLTYPE loc
= this->get_location();
5605 _mesa_glsl_error(& loc
, state
, "main() must return void");
5608 if (!hir_parameters
.is_empty()) {
5609 YYLTYPE loc
= this->get_location();
5611 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5615 /* Finish storing the information about this new function in its signature.
5618 sig
= new(ctx
) ir_function_signature(return_type
);
5619 f
->add_signature(sig
);
5622 sig
->replace_parameters(&hir_parameters
);
5625 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5628 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5629 unsigned qual_index
;
5630 if (process_qualifier_constant(state
, &loc
, "index",
5631 this->return_type
->qualifier
.index
,
5633 if (!state
->has_explicit_uniform_location()) {
5634 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5635 "GL_ARB_explicit_uniform_location or "
5637 } else if (qual_index
>= MAX_SUBROUTINES
) {
5638 _mesa_glsl_error(&loc
, state
,
5639 "invalid subroutine index (%d) index must "
5640 "be a number between 0 and "
5641 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5642 MAX_SUBROUTINES
- 1);
5644 f
->subroutine_index
= qual_index
;
5649 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5650 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5651 f
->num_subroutine_types
);
5653 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5654 const struct glsl_type
*type
;
5655 /* the subroutine type must be already declared */
5656 type
= state
->symbols
->get_type(decl
->identifier
);
5658 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5661 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5662 ir_function
*fn
= state
->subroutine_types
[i
];
5663 ir_function_signature
*tsig
= NULL
;
5665 if (strcmp(fn
->name
, decl
->identifier
))
5668 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5671 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5673 if (tsig
->return_type
!= sig
->return_type
) {
5674 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5678 f
->subroutine_types
[idx
++] = type
;
5680 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5682 state
->num_subroutines
+ 1);
5683 state
->subroutines
[state
->num_subroutines
] = f
;
5684 state
->num_subroutines
++;
5688 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5689 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5690 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5693 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5695 state
->num_subroutine_types
+ 1);
5696 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5697 state
->num_subroutine_types
++;
5699 f
->is_subroutine
= true;
5702 /* Function declarations (prototypes) do not have r-values.
5709 ast_function_definition::hir(exec_list
*instructions
,
5710 struct _mesa_glsl_parse_state
*state
)
5712 prototype
->is_definition
= true;
5713 prototype
->hir(instructions
, state
);
5715 ir_function_signature
*signature
= prototype
->signature
;
5716 if (signature
== NULL
)
5719 assert(state
->current_function
== NULL
);
5720 state
->current_function
= signature
;
5721 state
->found_return
= false;
5723 /* Duplicate parameters declared in the prototype as concrete variables.
5724 * Add these to the symbol table.
5726 state
->symbols
->push_scope();
5727 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5728 assert(var
->as_variable() != NULL
);
5730 /* The only way a parameter would "exist" is if two parameters have
5733 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5734 YYLTYPE loc
= this->get_location();
5736 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5738 state
->symbols
->add_variable(var
);
5742 /* Convert the body of the function to HIR. */
5743 this->body
->hir(&signature
->body
, state
);
5744 signature
->is_defined
= true;
5746 state
->symbols
->pop_scope();
5748 assert(state
->current_function
== signature
);
5749 state
->current_function
= NULL
;
5751 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5752 YYLTYPE loc
= this->get_location();
5753 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5754 "%s, but no return statement",
5755 signature
->function_name(),
5756 signature
->return_type
->name
);
5759 /* Function definitions do not have r-values.
5766 ast_jump_statement::hir(exec_list
*instructions
,
5767 struct _mesa_glsl_parse_state
*state
)
5774 assert(state
->current_function
);
5776 if (opt_return_value
) {
5777 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5779 /* The value of the return type can be NULL if the shader says
5780 * 'return foo();' and foo() is a function that returns void.
5782 * NOTE: The GLSL spec doesn't say that this is an error. The type
5783 * of the return value is void. If the return type of the function is
5784 * also void, then this should compile without error. Seriously.
5786 const glsl_type
*const ret_type
=
5787 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5789 /* Implicit conversions are not allowed for return values prior to
5790 * ARB_shading_language_420pack.
5792 if (state
->current_function
->return_type
!= ret_type
) {
5793 YYLTYPE loc
= this->get_location();
5795 if (state
->has_420pack()) {
5796 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5798 _mesa_glsl_error(& loc
, state
,
5799 "could not implicitly convert return value "
5800 "to %s, in function `%s'",
5801 state
->current_function
->return_type
->name
,
5802 state
->current_function
->function_name());
5805 _mesa_glsl_error(& loc
, state
,
5806 "`return' with wrong type %s, in function `%s' "
5809 state
->current_function
->function_name(),
5810 state
->current_function
->return_type
->name
);
5812 } else if (state
->current_function
->return_type
->base_type
==
5814 YYLTYPE loc
= this->get_location();
5816 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5817 * specs add a clarification:
5819 * "A void function can only use return without a return argument, even if
5820 * the return argument has void type. Return statements only accept values:
5823 * void func2() { return func1(); } // illegal return statement"
5825 _mesa_glsl_error(& loc
, state
,
5826 "void functions can only use `return' without a "
5830 inst
= new(ctx
) ir_return(ret
);
5832 if (state
->current_function
->return_type
->base_type
!=
5834 YYLTYPE loc
= this->get_location();
5836 _mesa_glsl_error(& loc
, state
,
5837 "`return' with no value, in function %s returning "
5839 state
->current_function
->function_name());
5841 inst
= new(ctx
) ir_return
;
5844 state
->found_return
= true;
5845 instructions
->push_tail(inst
);
5850 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5851 YYLTYPE loc
= this->get_location();
5853 _mesa_glsl_error(& loc
, state
,
5854 "`discard' may only appear in a fragment shader");
5856 instructions
->push_tail(new(ctx
) ir_discard
);
5861 if (mode
== ast_continue
&&
5862 state
->loop_nesting_ast
== NULL
) {
5863 YYLTYPE loc
= this->get_location();
5865 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5866 } else if (mode
== ast_break
&&
5867 state
->loop_nesting_ast
== NULL
&&
5868 state
->switch_state
.switch_nesting_ast
== NULL
) {
5869 YYLTYPE loc
= this->get_location();
5871 _mesa_glsl_error(& loc
, state
,
5872 "break may only appear in a loop or a switch");
5874 /* For a loop, inline the for loop expression again, since we don't
5875 * know where near the end of the loop body the normal copy of it is
5876 * going to be placed. Same goes for the condition for a do-while
5879 if (state
->loop_nesting_ast
!= NULL
&&
5880 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5881 if (state
->loop_nesting_ast
->rest_expression
) {
5882 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5885 if (state
->loop_nesting_ast
->mode
==
5886 ast_iteration_statement::ast_do_while
) {
5887 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5891 if (state
->switch_state
.is_switch_innermost
&&
5892 mode
== ast_continue
) {
5893 /* Set 'continue_inside' to true. */
5894 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5895 ir_dereference_variable
*deref_continue_inside_var
=
5896 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5897 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5900 /* Break out from the switch, continue for the loop will
5901 * be called right after switch. */
5902 ir_loop_jump
*const jump
=
5903 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5904 instructions
->push_tail(jump
);
5906 } else if (state
->switch_state
.is_switch_innermost
&&
5907 mode
== ast_break
) {
5908 /* Force break out of switch by inserting a break. */
5909 ir_loop_jump
*const jump
=
5910 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5911 instructions
->push_tail(jump
);
5913 ir_loop_jump
*const jump
=
5914 new(ctx
) ir_loop_jump((mode
== ast_break
)
5915 ? ir_loop_jump::jump_break
5916 : ir_loop_jump::jump_continue
);
5917 instructions
->push_tail(jump
);
5924 /* Jump instructions do not have r-values.
5931 ast_selection_statement::hir(exec_list
*instructions
,
5932 struct _mesa_glsl_parse_state
*state
)
5936 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5938 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5940 * "Any expression whose type evaluates to a Boolean can be used as the
5941 * conditional expression bool-expression. Vector types are not accepted
5942 * as the expression to if."
5944 * The checks are separated so that higher quality diagnostics can be
5945 * generated for cases where both rules are violated.
5947 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5948 YYLTYPE loc
= this->condition
->get_location();
5950 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5954 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5956 if (then_statement
!= NULL
) {
5957 state
->symbols
->push_scope();
5958 then_statement
->hir(& stmt
->then_instructions
, state
);
5959 state
->symbols
->pop_scope();
5962 if (else_statement
!= NULL
) {
5963 state
->symbols
->push_scope();
5964 else_statement
->hir(& stmt
->else_instructions
, state
);
5965 state
->symbols
->pop_scope();
5968 instructions
->push_tail(stmt
);
5970 /* if-statements do not have r-values.
5976 /* Used for detection of duplicate case values, compare
5977 * given contents directly.
5980 compare_case_value(const void *a
, const void *b
)
5982 return *(unsigned *) a
== *(unsigned *) b
;
5986 /* Used for detection of duplicate case values, just
5987 * returns key contents as is.
5990 key_contents(const void *key
)
5992 return *(unsigned *) key
;
5997 ast_switch_statement::hir(exec_list
*instructions
,
5998 struct _mesa_glsl_parse_state
*state
)
6002 ir_rvalue
*const test_expression
=
6003 this->test_expression
->hir(instructions
, state
);
6005 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6007 * "The type of init-expression in a switch statement must be a
6010 if (!test_expression
->type
->is_scalar() ||
6011 !test_expression
->type
->is_integer()) {
6012 YYLTYPE loc
= this->test_expression
->get_location();
6014 _mesa_glsl_error(& loc
,
6016 "switch-statement expression must be scalar "
6020 /* Track the switch-statement nesting in a stack-like manner.
6022 struct glsl_switch_state saved
= state
->switch_state
;
6024 state
->switch_state
.is_switch_innermost
= true;
6025 state
->switch_state
.switch_nesting_ast
= this;
6026 state
->switch_state
.labels_ht
=
6027 _mesa_hash_table_create(NULL
, key_contents
,
6028 compare_case_value
);
6029 state
->switch_state
.previous_default
= NULL
;
6031 /* Initalize is_fallthru state to false.
6033 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6034 state
->switch_state
.is_fallthru_var
=
6035 new(ctx
) ir_variable(glsl_type::bool_type
,
6036 "switch_is_fallthru_tmp",
6038 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6040 ir_dereference_variable
*deref_is_fallthru_var
=
6041 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6042 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6045 /* Initialize continue_inside state to false.
6047 state
->switch_state
.continue_inside
=
6048 new(ctx
) ir_variable(glsl_type::bool_type
,
6049 "continue_inside_tmp",
6051 instructions
->push_tail(state
->switch_state
.continue_inside
);
6053 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6054 ir_dereference_variable
*deref_continue_inside_var
=
6055 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6056 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6059 state
->switch_state
.run_default
=
6060 new(ctx
) ir_variable(glsl_type::bool_type
,
6063 instructions
->push_tail(state
->switch_state
.run_default
);
6065 /* Loop around the switch is used for flow control. */
6066 ir_loop
* loop
= new(ctx
) ir_loop();
6067 instructions
->push_tail(loop
);
6069 /* Cache test expression.
6071 test_to_hir(&loop
->body_instructions
, state
);
6073 /* Emit code for body of switch stmt.
6075 body
->hir(&loop
->body_instructions
, state
);
6077 /* Insert a break at the end to exit loop. */
6078 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6079 loop
->body_instructions
.push_tail(jump
);
6081 /* If we are inside loop, check if continue got called inside switch. */
6082 if (state
->loop_nesting_ast
!= NULL
) {
6083 ir_dereference_variable
*deref_continue_inside
=
6084 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6085 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6086 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6088 if (state
->loop_nesting_ast
!= NULL
) {
6089 if (state
->loop_nesting_ast
->rest_expression
) {
6090 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6093 if (state
->loop_nesting_ast
->mode
==
6094 ast_iteration_statement::ast_do_while
) {
6095 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6098 irif
->then_instructions
.push_tail(jump
);
6099 instructions
->push_tail(irif
);
6102 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6104 state
->switch_state
= saved
;
6106 /* Switch statements do not have r-values. */
6112 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6113 struct _mesa_glsl_parse_state
*state
)
6117 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6118 * on the switch test case. The first one would be already raised when
6119 * getting the test_expression at ast_switch_statement::hir
6121 test_expression
->set_is_lhs(true);
6122 /* Cache value of test expression. */
6123 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6125 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6128 ir_dereference_variable
*deref_test_var
=
6129 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6131 instructions
->push_tail(state
->switch_state
.test_var
);
6132 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6137 ast_switch_body::hir(exec_list
*instructions
,
6138 struct _mesa_glsl_parse_state
*state
)
6141 stmts
->hir(instructions
, state
);
6143 /* Switch bodies do not have r-values. */
6148 ast_case_statement_list::hir(exec_list
*instructions
,
6149 struct _mesa_glsl_parse_state
*state
)
6151 exec_list default_case
, after_default
, tmp
;
6153 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6154 case_stmt
->hir(&tmp
, state
);
6157 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6158 default_case
.append_list(&tmp
);
6162 /* If default case found, append 'after_default' list. */
6163 if (!default_case
.is_empty())
6164 after_default
.append_list(&tmp
);
6166 instructions
->append_list(&tmp
);
6169 /* Handle the default case. This is done here because default might not be
6170 * the last case. We need to add checks against following cases first to see
6171 * if default should be chosen or not.
6173 if (!default_case
.is_empty()) {
6175 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6176 ir_dereference_variable
*deref_run_default_var
=
6177 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6179 /* Choose to run default case initially, following conditional
6180 * assignments might change this.
6182 ir_assignment
*const init_var
=
6183 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6184 instructions
->push_tail(init_var
);
6186 /* Default case was the last one, no checks required. */
6187 if (after_default
.is_empty()) {
6188 instructions
->append_list(&default_case
);
6192 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6193 ir_assignment
*assign
= ir
->as_assignment();
6198 /* Clone the check between case label and init expression. */
6199 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6200 ir_expression
*clone
= exp
->clone(state
, NULL
);
6202 ir_dereference_variable
*deref_var
=
6203 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6204 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6206 ir_assignment
*const set_false
=
6207 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6209 instructions
->push_tail(set_false
);
6212 /* Append default case and all cases after it. */
6213 instructions
->append_list(&default_case
);
6214 instructions
->append_list(&after_default
);
6217 /* Case statements do not have r-values. */
6222 ast_case_statement::hir(exec_list
*instructions
,
6223 struct _mesa_glsl_parse_state
*state
)
6225 labels
->hir(instructions
, state
);
6227 /* Guard case statements depending on fallthru state. */
6228 ir_dereference_variable
*const deref_fallthru_guard
=
6229 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6230 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6232 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6233 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6235 instructions
->push_tail(test_fallthru
);
6237 /* Case statements do not have r-values. */
6243 ast_case_label_list::hir(exec_list
*instructions
,
6244 struct _mesa_glsl_parse_state
*state
)
6246 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6247 label
->hir(instructions
, state
);
6249 /* Case labels do not have r-values. */
6254 ast_case_label::hir(exec_list
*instructions
,
6255 struct _mesa_glsl_parse_state
*state
)
6259 ir_dereference_variable
*deref_fallthru_var
=
6260 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6262 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6264 /* If not default case, ... */
6265 if (this->test_value
!= NULL
) {
6266 /* Conditionally set fallthru state based on
6267 * comparison of cached test expression value to case label.
6269 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6270 ir_constant
*label_const
= label_rval
->constant_expression_value();
6273 YYLTYPE loc
= this->test_value
->get_location();
6275 _mesa_glsl_error(& loc
, state
,
6276 "switch statement case label must be a "
6277 "constant expression");
6279 /* Stuff a dummy value in to allow processing to continue. */
6280 label_const
= new(ctx
) ir_constant(0);
6283 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6284 (void *)(uintptr_t)&label_const
->value
.u
[0]);
6287 ast_expression
*previous_label
= (ast_expression
*) entry
->data
;
6288 YYLTYPE loc
= this->test_value
->get_location();
6289 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6291 loc
= previous_label
->get_location();
6292 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6294 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6295 (void *)(uintptr_t)&label_const
->value
.u
[0],
6300 ir_dereference_variable
*deref_test_var
=
6301 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6303 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6308 * From GLSL 4.40 specification section 6.2 ("Selection"):
6310 * "The type of the init-expression value in a switch statement must
6311 * be a scalar int or uint. The type of the constant-expression value
6312 * in a case label also must be a scalar int or uint. When any pair
6313 * of these values is tested for "equal value" and the types do not
6314 * match, an implicit conversion will be done to convert the int to a
6315 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6318 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6319 YYLTYPE loc
= this->test_value
->get_location();
6321 const glsl_type
*type_a
= label_const
->type
;
6322 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6324 /* Check if int->uint implicit conversion is supported. */
6325 bool integer_conversion_supported
=
6326 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6329 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6330 !integer_conversion_supported
) {
6331 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6332 "init-expression and case label (%s != %s)",
6333 type_a
->name
, type_b
->name
);
6335 /* Conversion of the case label. */
6336 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6337 if (!apply_implicit_conversion(glsl_type::uint_type
,
6338 test_cond
->operands
[0], state
))
6339 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6341 /* Conversion of the init-expression value. */
6342 if (!apply_implicit_conversion(glsl_type::uint_type
,
6343 test_cond
->operands
[1], state
))
6344 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6349 ir_assignment
*set_fallthru_on_test
=
6350 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6352 instructions
->push_tail(set_fallthru_on_test
);
6353 } else { /* default case */
6354 if (state
->switch_state
.previous_default
) {
6355 YYLTYPE loc
= this->get_location();
6356 _mesa_glsl_error(& loc
, state
,
6357 "multiple default labels in one switch");
6359 loc
= state
->switch_state
.previous_default
->get_location();
6360 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6362 state
->switch_state
.previous_default
= this;
6364 /* Set fallthru condition on 'run_default' bool. */
6365 ir_dereference_variable
*deref_run_default
=
6366 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6367 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6368 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6372 /* Set falltrhu state. */
6373 ir_assignment
*set_fallthru
=
6374 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6376 instructions
->push_tail(set_fallthru
);
6379 /* Case statements do not have r-values. */
6384 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6385 struct _mesa_glsl_parse_state
*state
)
6389 if (condition
!= NULL
) {
6390 ir_rvalue
*const cond
=
6391 condition
->hir(instructions
, state
);
6394 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6395 YYLTYPE loc
= condition
->get_location();
6397 _mesa_glsl_error(& loc
, state
,
6398 "loop condition must be scalar boolean");
6400 /* As the first code in the loop body, generate a block that looks
6401 * like 'if (!condition) break;' as the loop termination condition.
6403 ir_rvalue
*const not_cond
=
6404 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6406 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6408 ir_jump
*const break_stmt
=
6409 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6411 if_stmt
->then_instructions
.push_tail(break_stmt
);
6412 instructions
->push_tail(if_stmt
);
6419 ast_iteration_statement::hir(exec_list
*instructions
,
6420 struct _mesa_glsl_parse_state
*state
)
6424 /* For-loops and while-loops start a new scope, but do-while loops do not.
6426 if (mode
!= ast_do_while
)
6427 state
->symbols
->push_scope();
6429 if (init_statement
!= NULL
)
6430 init_statement
->hir(instructions
, state
);
6432 ir_loop
*const stmt
= new(ctx
) ir_loop();
6433 instructions
->push_tail(stmt
);
6435 /* Track the current loop nesting. */
6436 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6438 state
->loop_nesting_ast
= this;
6440 /* Likewise, indicate that following code is closest to a loop,
6441 * NOT closest to a switch.
6443 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6444 state
->switch_state
.is_switch_innermost
= false;
6446 if (mode
!= ast_do_while
)
6447 condition_to_hir(&stmt
->body_instructions
, state
);
6450 body
->hir(& stmt
->body_instructions
, state
);
6452 if (rest_expression
!= NULL
)
6453 rest_expression
->hir(& stmt
->body_instructions
, state
);
6455 if (mode
== ast_do_while
)
6456 condition_to_hir(&stmt
->body_instructions
, state
);
6458 if (mode
!= ast_do_while
)
6459 state
->symbols
->pop_scope();
6461 /* Restore previous nesting before returning. */
6462 state
->loop_nesting_ast
= nesting_ast
;
6463 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6465 /* Loops do not have r-values.
6472 * Determine if the given type is valid for establishing a default precision
6475 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6477 * "The precision statement
6479 * precision precision-qualifier type;
6481 * can be used to establish a default precision qualifier. The type field
6482 * can be either int or float or any of the sampler types, and the
6483 * precision-qualifier can be lowp, mediump, or highp."
6485 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6486 * qualifiers on sampler types, but this seems like an oversight (since the
6487 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6488 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6492 is_valid_default_precision_type(const struct glsl_type
*const type
)
6497 switch (type
->base_type
) {
6499 case GLSL_TYPE_FLOAT
:
6500 /* "int" and "float" are valid, but vectors and matrices are not. */
6501 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6502 case GLSL_TYPE_SAMPLER
:
6503 case GLSL_TYPE_IMAGE
:
6504 case GLSL_TYPE_ATOMIC_UINT
:
6513 ast_type_specifier::hir(exec_list
*instructions
,
6514 struct _mesa_glsl_parse_state
*state
)
6516 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6519 YYLTYPE loc
= this->get_location();
6521 /* If this is a precision statement, check that the type to which it is
6522 * applied is either float or int.
6524 * From section 4.5.3 of the GLSL 1.30 spec:
6525 * "The precision statement
6526 * precision precision-qualifier type;
6527 * can be used to establish a default precision qualifier. The type
6528 * field can be either int or float [...]. Any other types or
6529 * qualifiers will result in an error.
6531 if (this->default_precision
!= ast_precision_none
) {
6532 if (!state
->check_precision_qualifiers_allowed(&loc
))
6535 if (this->structure
!= NULL
) {
6536 _mesa_glsl_error(&loc
, state
,
6537 "precision qualifiers do not apply to structures");
6541 if (this->array_specifier
!= NULL
) {
6542 _mesa_glsl_error(&loc
, state
,
6543 "default precision statements do not apply to "
6548 const struct glsl_type
*const type
=
6549 state
->symbols
->get_type(this->type_name
);
6550 if (!is_valid_default_precision_type(type
)) {
6551 _mesa_glsl_error(&loc
, state
,
6552 "default precision statements apply only to "
6553 "float, int, and opaque types");
6557 if (state
->es_shader
) {
6558 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6561 * "Non-precision qualified declarations will use the precision
6562 * qualifier specified in the most recent precision statement
6563 * that is still in scope. The precision statement has the same
6564 * scoping rules as variable declarations. If it is declared
6565 * inside a compound statement, its effect stops at the end of
6566 * the innermost statement it was declared in. Precision
6567 * statements in nested scopes override precision statements in
6568 * outer scopes. Multiple precision statements for the same basic
6569 * type can appear inside the same scope, with later statements
6570 * overriding earlier statements within that scope."
6572 * Default precision specifications follow the same scope rules as
6573 * variables. So, we can track the state of the default precision
6574 * qualifiers in the symbol table, and the rules will just work. This
6575 * is a slight abuse of the symbol table, but it has the semantics
6578 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6579 this->default_precision
);
6582 /* FINISHME: Translate precision statements into IR. */
6586 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6587 * process_record_constructor() can do type-checking on C-style initializer
6588 * expressions of structs, but ast_struct_specifier should only be translated
6589 * to HIR if it is declaring the type of a structure.
6591 * The ->is_declaration field is false for initializers of variables
6592 * declared separately from the struct's type definition.
6594 * struct S { ... }; (is_declaration = true)
6595 * struct T { ... } t = { ... }; (is_declaration = true)
6596 * S s = { ... }; (is_declaration = false)
6598 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6599 return this->structure
->hir(instructions
, state
);
6606 * Process a structure or interface block tree into an array of structure fields
6608 * After parsing, where there are some syntax differnces, structures and
6609 * interface blocks are almost identical. They are similar enough that the
6610 * AST for each can be processed the same way into a set of
6611 * \c glsl_struct_field to describe the members.
6613 * If we're processing an interface block, var_mode should be the type of the
6614 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6615 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6619 * The number of fields processed. A pointer to the array structure fields is
6620 * stored in \c *fields_ret.
6623 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6624 struct _mesa_glsl_parse_state
*state
,
6625 exec_list
*declarations
,
6626 glsl_struct_field
**fields_ret
,
6628 enum glsl_matrix_layout matrix_layout
,
6629 bool allow_reserved_names
,
6630 ir_variable_mode var_mode
,
6631 ast_type_qualifier
*layout
,
6632 unsigned block_stream
,
6633 unsigned block_xfb_buffer
,
6634 unsigned block_xfb_offset
,
6635 unsigned expl_location
,
6636 unsigned expl_align
)
6638 unsigned decl_count
= 0;
6639 unsigned next_offset
= 0;
6641 /* Make an initial pass over the list of fields to determine how
6642 * many there are. Each element in this list is an ast_declarator_list.
6643 * This means that we actually need to count the number of elements in the
6644 * 'declarations' list in each of the elements.
6646 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6647 decl_count
+= decl_list
->declarations
.length();
6650 /* Allocate storage for the fields and process the field
6651 * declarations. As the declarations are processed, try to also convert
6652 * the types to HIR. This ensures that structure definitions embedded in
6653 * other structure definitions or in interface blocks are processed.
6655 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
6658 bool first_member
= true;
6659 bool first_member_has_explicit_location
= false;
6662 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6663 const char *type_name
;
6664 YYLTYPE loc
= decl_list
->get_location();
6666 decl_list
->type
->specifier
->hir(instructions
, state
);
6668 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6670 * "Anonymous structures are not supported; so embedded structures
6671 * must have a declarator. A name given to an embedded struct is
6672 * scoped at the same level as the struct it is embedded in."
6674 * The same section of the GLSL 1.20 spec says:
6676 * "Anonymous structures are not supported. Embedded structures are
6679 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6680 * embedded structures in 1.10 only.
6682 if (state
->language_version
!= 110 &&
6683 decl_list
->type
->specifier
->structure
!= NULL
)
6684 _mesa_glsl_error(&loc
, state
,
6685 "embedded structure declarations are not allowed");
6687 const glsl_type
*decl_type
=
6688 decl_list
->type
->glsl_type(& type_name
, state
);
6690 const struct ast_type_qualifier
*const qual
=
6691 &decl_list
->type
->qualifier
;
6693 /* From section 4.3.9 of the GLSL 4.40 spec:
6695 * "[In interface blocks] opaque types are not allowed."
6697 * It should be impossible for decl_type to be NULL here. Cases that
6698 * might naturally lead to decl_type being NULL, especially for the
6699 * is_interface case, will have resulted in compilation having
6700 * already halted due to a syntax error.
6705 if (decl_type
->contains_opaque()) {
6706 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6707 "interface block contains opaque variable");
6710 if (decl_type
->contains_atomic()) {
6711 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6713 * "Members of structures cannot be declared as atomic counter
6716 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6719 if (decl_type
->contains_image()) {
6720 /* FINISHME: Same problem as with atomic counters.
6721 * FINISHME: Request clarification from Khronos and add
6722 * FINISHME: spec quotation here.
6724 _mesa_glsl_error(&loc
, state
, "image in structure");
6728 if (qual
->flags
.q
.explicit_binding
) {
6729 _mesa_glsl_error(&loc
, state
,
6730 "binding layout qualifier cannot be applied "
6731 "to struct or interface block members");
6735 if (!first_member
) {
6736 if (!layout
->flags
.q
.explicit_location
&&
6737 ((first_member_has_explicit_location
&&
6738 !qual
->flags
.q
.explicit_location
) ||
6739 (!first_member_has_explicit_location
&&
6740 qual
->flags
.q
.explicit_location
))) {
6741 _mesa_glsl_error(&loc
, state
,
6742 "when block-level location layout qualifier "
6743 "is not supplied either all members must "
6744 "have a location layout qualifier or all "
6745 "members must not have a location layout "
6749 first_member
= false;
6750 first_member_has_explicit_location
=
6751 qual
->flags
.q
.explicit_location
;
6755 if (qual
->flags
.q
.std140
||
6756 qual
->flags
.q
.std430
||
6757 qual
->flags
.q
.packed
||
6758 qual
->flags
.q
.shared
) {
6759 _mesa_glsl_error(&loc
, state
,
6760 "uniform/shader storage block layout qualifiers "
6761 "std140, std430, packed, and shared can only be "
6762 "applied to uniform/shader storage blocks, not "
6766 if (qual
->flags
.q
.constant
) {
6767 _mesa_glsl_error(&loc
, state
,
6768 "const storage qualifier cannot be applied "
6769 "to struct or interface block members");
6772 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6774 * "A block member may be declared with a stream identifier, but
6775 * the specified stream must match the stream associated with the
6776 * containing block."
6778 if (qual
->flags
.q
.explicit_stream
) {
6779 unsigned qual_stream
;
6780 if (process_qualifier_constant(state
, &loc
, "stream",
6781 qual
->stream
, &qual_stream
) &&
6782 qual_stream
!= block_stream
) {
6783 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6784 "interface block member does not match "
6785 "the interface block (%u vs %u)", qual_stream
,
6791 unsigned explicit_xfb_buffer
= 0;
6792 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6793 unsigned qual_xfb_buffer
;
6794 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6795 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6796 explicit_xfb_buffer
= 1;
6797 if (qual_xfb_buffer
!= block_xfb_buffer
)
6798 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6799 "interface block member does not match "
6800 "the interface block (%u vs %u)",
6801 qual_xfb_buffer
, block_xfb_buffer
);
6803 xfb_buffer
= (int) qual_xfb_buffer
;
6806 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
6807 xfb_buffer
= (int) block_xfb_buffer
;
6810 int xfb_stride
= -1;
6811 if (qual
->flags
.q
.explicit_xfb_stride
) {
6812 unsigned qual_xfb_stride
;
6813 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6814 qual
->xfb_stride
, &qual_xfb_stride
)) {
6815 xfb_stride
= (int) qual_xfb_stride
;
6819 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6820 _mesa_glsl_error(&loc
, state
,
6821 "interpolation qualifiers cannot be used "
6822 "with uniform interface blocks");
6825 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6826 qual
->has_auxiliary_storage()) {
6827 _mesa_glsl_error(&loc
, state
,
6828 "auxiliary storage qualifiers cannot be used "
6829 "in uniform blocks or structures.");
6832 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6833 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6834 _mesa_glsl_error(&loc
, state
,
6835 "row_major and column_major can only be "
6836 "applied to interface blocks");
6838 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6841 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6842 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6843 "readonly and writeonly.");
6846 foreach_list_typed (ast_declaration
, decl
, link
,
6847 &decl_list
->declarations
) {
6848 YYLTYPE loc
= decl
->get_location();
6850 if (!allow_reserved_names
)
6851 validate_identifier(decl
->identifier
, loc
, state
);
6853 const struct glsl_type
*field_type
=
6854 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6855 validate_array_dimensions(field_type
, state
, &loc
);
6856 fields
[i
].type
= field_type
;
6857 fields
[i
].name
= decl
->identifier
;
6858 fields
[i
].interpolation
=
6859 interpret_interpolation_qualifier(qual
, field_type
,
6860 var_mode
, state
, &loc
);
6861 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6862 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6863 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6864 fields
[i
].precision
= qual
->precision
;
6865 fields
[i
].offset
= -1;
6866 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6867 fields
[i
].xfb_buffer
= xfb_buffer
;
6868 fields
[i
].xfb_stride
= xfb_stride
;
6870 if (qual
->flags
.q
.explicit_location
) {
6871 unsigned qual_location
;
6872 if (process_qualifier_constant(state
, &loc
, "location",
6873 qual
->location
, &qual_location
)) {
6874 fields
[i
].location
= qual_location
+
6875 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
6876 expl_location
= fields
[i
].location
+
6877 fields
[i
].type
->count_attribute_slots(false);
6880 if (layout
&& layout
->flags
.q
.explicit_location
) {
6881 fields
[i
].location
= expl_location
;
6882 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6884 fields
[i
].location
= -1;
6888 /* Offset can only be used with std430 and std140 layouts an initial
6889 * value of 0 is used for error detection.
6895 if (qual
->flags
.q
.row_major
||
6896 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6902 if(layout
->flags
.q
.std140
) {
6903 align
= field_type
->std140_base_alignment(row_major
);
6904 size
= field_type
->std140_size(row_major
);
6905 } else if (layout
->flags
.q
.std430
) {
6906 align
= field_type
->std430_base_alignment(row_major
);
6907 size
= field_type
->std430_size(row_major
);
6911 if (qual
->flags
.q
.explicit_offset
) {
6912 unsigned qual_offset
;
6913 if (process_qualifier_constant(state
, &loc
, "offset",
6914 qual
->offset
, &qual_offset
)) {
6915 if (align
!= 0 && size
!= 0) {
6916 if (next_offset
> qual_offset
)
6917 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6918 "offset overlaps previous member");
6920 if (qual_offset
% align
) {
6921 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6922 "must be a multiple of the base "
6923 "alignment of %s", field_type
->name
);
6925 fields
[i
].offset
= qual_offset
;
6926 next_offset
= glsl_align(qual_offset
+ size
, align
);
6928 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6929 "with std430 and std140 layouts");
6934 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6935 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6937 if (align
== 0 || size
== 0) {
6938 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6939 "std430 and std140 layouts");
6940 } else if (qual
->flags
.q
.explicit_align
) {
6941 unsigned member_align
;
6942 if (process_qualifier_constant(state
, &loc
, "align",
6943 qual
->align
, &member_align
)) {
6944 if (member_align
== 0 ||
6945 member_align
& (member_align
- 1)) {
6946 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6947 "in not a power of 2");
6949 fields
[i
].offset
= glsl_align(offset
, member_align
);
6950 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6954 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6955 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6957 } else if (!qual
->flags
.q
.explicit_offset
) {
6958 if (align
!= 0 && size
!= 0)
6959 next_offset
= glsl_align(next_offset
+ size
, align
);
6962 /* From the ARB_enhanced_layouts spec:
6964 * "The given offset applies to the first component of the first
6965 * member of the qualified entity. Then, within the qualified
6966 * entity, subsequent components are each assigned, in order, to
6967 * the next available offset aligned to a multiple of that
6968 * component's size. Aggregate types are flattened down to the
6969 * component level to get this sequence of components."
6971 if (qual
->flags
.q
.explicit_xfb_offset
) {
6972 unsigned xfb_offset
;
6973 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
6974 qual
->offset
, &xfb_offset
)) {
6975 fields
[i
].offset
= xfb_offset
;
6976 block_xfb_offset
= fields
[i
].offset
+
6977 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6980 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
6981 unsigned align
= field_type
->is_64bit() ? 8 : 4;
6982 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
6984 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6988 /* Propogate row- / column-major information down the fields of the
6989 * structure or interface block. Structures need this data because
6990 * the structure may contain a structure that contains ... a matrix
6991 * that need the proper layout.
6993 if (is_interface
&& layout
&&
6994 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6995 (field_type
->without_array()->is_matrix()
6996 || field_type
->without_array()->is_record())) {
6997 /* If no layout is specified for the field, inherit the layout
7000 fields
[i
].matrix_layout
= matrix_layout
;
7002 if (qual
->flags
.q
.row_major
)
7003 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7004 else if (qual
->flags
.q
.column_major
)
7005 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7007 /* If we're processing an uniform or buffer block, the matrix
7008 * layout must be decided by this point.
7010 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7011 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7014 /* Image qualifiers are allowed on buffer variables, which can only
7015 * be defined inside shader storage buffer objects
7017 if (layout
&& var_mode
== ir_var_shader_storage
) {
7018 /* For readonly and writeonly qualifiers the field definition,
7019 * if set, overwrites the layout qualifier.
7021 if (qual
->flags
.q
.read_only
) {
7022 fields
[i
].image_read_only
= true;
7023 fields
[i
].image_write_only
= false;
7024 } else if (qual
->flags
.q
.write_only
) {
7025 fields
[i
].image_read_only
= false;
7026 fields
[i
].image_write_only
= true;
7028 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
7029 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
7032 /* For other qualifiers, we set the flag if either the layout
7033 * qualifier or the field qualifier are set
7035 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
7036 layout
->flags
.q
.coherent
;
7037 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
7038 layout
->flags
.q
._volatile
;
7039 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
7040 layout
->flags
.q
.restrict_flag
;
7047 assert(i
== decl_count
);
7049 *fields_ret
= fields
;
7055 ast_struct_specifier::hir(exec_list
*instructions
,
7056 struct _mesa_glsl_parse_state
*state
)
7058 YYLTYPE loc
= this->get_location();
7060 unsigned expl_location
= 0;
7061 if (layout
&& layout
->flags
.q
.explicit_location
) {
7062 if (!process_qualifier_constant(state
, &loc
, "location",
7063 layout
->location
, &expl_location
)) {
7066 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7070 glsl_struct_field
*fields
;
7071 unsigned decl_count
=
7072 ast_process_struct_or_iface_block_members(instructions
,
7074 &this->declarations
,
7077 GLSL_MATRIX_LAYOUT_INHERITED
,
7078 false /* allow_reserved_names */,
7081 0, /* for interface only */
7082 0, /* for interface only */
7083 0, /* for interface only */
7085 0 /* for interface only */);
7087 validate_identifier(this->name
, loc
, state
);
7089 const glsl_type
*t
=
7090 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7092 if (!state
->symbols
->add_type(name
, t
)) {
7093 const glsl_type
*match
= state
->symbols
->get_type(name
);
7094 /* allow struct matching for desktop GL - older UE4 does this */
7095 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
7096 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7098 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7100 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7102 state
->num_user_structures
+ 1);
7104 s
[state
->num_user_structures
] = t
;
7105 state
->user_structures
= s
;
7106 state
->num_user_structures
++;
7110 /* Structure type definitions do not have r-values.
7117 * Visitor class which detects whether a given interface block has been used.
7119 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7122 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7123 : mode(mode
), block(block
), found(false)
7127 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7129 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7133 return visit_continue
;
7136 bool usage_found() const
7142 ir_variable_mode mode
;
7143 const glsl_type
*block
;
7148 is_unsized_array_last_element(ir_variable
*v
)
7150 const glsl_type
*interface_type
= v
->get_interface_type();
7151 int length
= interface_type
->length
;
7153 assert(v
->type
->is_unsized_array());
7155 /* Check if it is the last element of the interface */
7156 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7162 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7164 var
->data
.image_read_only
= field
.image_read_only
;
7165 var
->data
.image_write_only
= field
.image_write_only
;
7166 var
->data
.image_coherent
= field
.image_coherent
;
7167 var
->data
.image_volatile
= field
.image_volatile
;
7168 var
->data
.image_restrict
= field
.image_restrict
;
7172 ast_interface_block::hir(exec_list
*instructions
,
7173 struct _mesa_glsl_parse_state
*state
)
7175 YYLTYPE loc
= this->get_location();
7177 /* Interface blocks must be declared at global scope */
7178 if (state
->current_function
!= NULL
) {
7179 _mesa_glsl_error(&loc
, state
,
7180 "Interface block `%s' must be declared "
7185 /* Validate qualifiers:
7187 * - Layout Qualifiers as per the table in Section 4.4
7188 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7190 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7193 * "Additionally, memory qualifiers may also be used in the declaration
7194 * of shader storage blocks"
7196 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7197 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7198 * Layout Qualifiers) of the GLSL 4.50 spec says:
7200 * "The std430 qualifier is supported only for shader storage blocks;
7201 * using std430 on a uniform block will result in a compile-time error."
7203 ast_type_qualifier allowed_blk_qualifiers
;
7204 allowed_blk_qualifiers
.flags
.i
= 0;
7205 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7206 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7207 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7208 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7209 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7210 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7211 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7212 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7213 if (this->layout
.flags
.q
.buffer
) {
7214 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7215 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7216 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7217 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7218 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7219 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7220 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7222 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7225 /* Interface block */
7226 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7228 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7229 if (this->layout
.flags
.q
.out
) {
7230 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7231 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7232 state
->stage
== MESA_SHADER_TESS_CTRL
||
7233 state
->stage
== MESA_SHADER_TESS_EVAL
||
7234 state
->stage
== MESA_SHADER_VERTEX
) {
7235 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7236 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7237 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7238 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7239 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7240 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7241 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7242 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7244 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7245 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7249 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7250 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7251 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7256 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7257 "invalid qualifier for block",
7260 /* The ast_interface_block has a list of ast_declarator_lists. We
7261 * need to turn those into ir_variables with an association
7262 * with this uniform block.
7264 enum glsl_interface_packing packing
;
7265 if (this->layout
.flags
.q
.shared
) {
7266 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7267 } else if (this->layout
.flags
.q
.packed
) {
7268 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7269 } else if (this->layout
.flags
.q
.std430
) {
7270 packing
= GLSL_INTERFACE_PACKING_STD430
;
7272 /* The default layout is std140.
7274 packing
= GLSL_INTERFACE_PACKING_STD140
;
7277 ir_variable_mode var_mode
;
7278 const char *iface_type_name
;
7279 if (this->layout
.flags
.q
.in
) {
7280 var_mode
= ir_var_shader_in
;
7281 iface_type_name
= "in";
7282 } else if (this->layout
.flags
.q
.out
) {
7283 var_mode
= ir_var_shader_out
;
7284 iface_type_name
= "out";
7285 } else if (this->layout
.flags
.q
.uniform
) {
7286 var_mode
= ir_var_uniform
;
7287 iface_type_name
= "uniform";
7288 } else if (this->layout
.flags
.q
.buffer
) {
7289 var_mode
= ir_var_shader_storage
;
7290 iface_type_name
= "buffer";
7292 var_mode
= ir_var_auto
;
7293 iface_type_name
= "UNKNOWN";
7294 assert(!"interface block layout qualifier not found!");
7297 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7298 if (this->layout
.flags
.q
.row_major
)
7299 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7300 else if (this->layout
.flags
.q
.column_major
)
7301 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7303 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7304 exec_list declared_variables
;
7305 glsl_struct_field
*fields
;
7307 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7308 * that we don't have incompatible qualifiers
7310 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7311 _mesa_glsl_error(&loc
, state
,
7312 "Interface block sets both readonly and writeonly");
7315 unsigned qual_stream
;
7316 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7318 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7319 /* If the stream qualifier is invalid it doesn't make sense to continue
7320 * on and try to compare stream layouts on member variables against it
7321 * so just return early.
7326 unsigned qual_xfb_buffer
;
7327 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7328 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7329 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7333 unsigned qual_xfb_offset
;
7334 if (layout
.flags
.q
.explicit_xfb_offset
) {
7335 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7336 layout
.offset
, &qual_xfb_offset
)) {
7341 unsigned qual_xfb_stride
;
7342 if (layout
.flags
.q
.explicit_xfb_stride
) {
7343 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7344 layout
.xfb_stride
, &qual_xfb_stride
)) {
7349 unsigned expl_location
= 0;
7350 if (layout
.flags
.q
.explicit_location
) {
7351 if (!process_qualifier_constant(state
, &loc
, "location",
7352 layout
.location
, &expl_location
)) {
7355 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7356 : VARYING_SLOT_VAR0
;
7360 unsigned expl_align
= 0;
7361 if (layout
.flags
.q
.explicit_align
) {
7362 if (!process_qualifier_constant(state
, &loc
, "align",
7363 layout
.align
, &expl_align
)) {
7366 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7367 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7374 unsigned int num_variables
=
7375 ast_process_struct_or_iface_block_members(&declared_variables
,
7377 &this->declarations
,
7381 redeclaring_per_vertex
,
7390 if (!redeclaring_per_vertex
) {
7391 validate_identifier(this->block_name
, loc
, state
);
7393 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7395 * "Block names have no other use within a shader beyond interface
7396 * matching; it is a compile-time error to use a block name at global
7397 * scope for anything other than as a block name."
7399 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7400 if (var
&& !var
->type
->is_interface()) {
7401 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7402 "already used in the scope.",
7407 const glsl_type
*earlier_per_vertex
= NULL
;
7408 if (redeclaring_per_vertex
) {
7409 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7410 * the named interface block gl_in, we can find it by looking at the
7411 * previous declaration of gl_in. Otherwise we can find it by looking
7412 * at the previous decalartion of any of the built-in outputs,
7415 * Also check that the instance name and array-ness of the redeclaration
7419 case ir_var_shader_in
:
7420 if (ir_variable
*earlier_gl_in
=
7421 state
->symbols
->get_variable("gl_in")) {
7422 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7424 _mesa_glsl_error(&loc
, state
,
7425 "redeclaration of gl_PerVertex input not allowed "
7427 _mesa_shader_stage_to_string(state
->stage
));
7429 if (this->instance_name
== NULL
||
7430 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7431 !this->array_specifier
->is_single_dimension()) {
7432 _mesa_glsl_error(&loc
, state
,
7433 "gl_PerVertex input must be redeclared as "
7437 case ir_var_shader_out
:
7438 if (ir_variable
*earlier_gl_Position
=
7439 state
->symbols
->get_variable("gl_Position")) {
7440 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7441 } else if (ir_variable
*earlier_gl_out
=
7442 state
->symbols
->get_variable("gl_out")) {
7443 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7445 _mesa_glsl_error(&loc
, state
,
7446 "redeclaration of gl_PerVertex output not "
7447 "allowed in the %s shader",
7448 _mesa_shader_stage_to_string(state
->stage
));
7450 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7451 if (this->instance_name
== NULL
||
7452 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7453 _mesa_glsl_error(&loc
, state
,
7454 "gl_PerVertex output must be redeclared as "
7458 if (this->instance_name
!= NULL
) {
7459 _mesa_glsl_error(&loc
, state
,
7460 "gl_PerVertex output may not be redeclared with "
7461 "an instance name");
7466 _mesa_glsl_error(&loc
, state
,
7467 "gl_PerVertex must be declared as an input or an "
7472 if (earlier_per_vertex
== NULL
) {
7473 /* An error has already been reported. Bail out to avoid null
7474 * dereferences later in this function.
7479 /* Copy locations from the old gl_PerVertex interface block. */
7480 for (unsigned i
= 0; i
< num_variables
; i
++) {
7481 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7483 _mesa_glsl_error(&loc
, state
,
7484 "redeclaration of gl_PerVertex must be a subset "
7485 "of the built-in members of gl_PerVertex");
7487 fields
[i
].location
=
7488 earlier_per_vertex
->fields
.structure
[j
].location
;
7490 earlier_per_vertex
->fields
.structure
[j
].offset
;
7491 fields
[i
].interpolation
=
7492 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7493 fields
[i
].centroid
=
7494 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7496 earlier_per_vertex
->fields
.structure
[j
].sample
;
7498 earlier_per_vertex
->fields
.structure
[j
].patch
;
7499 fields
[i
].precision
=
7500 earlier_per_vertex
->fields
.structure
[j
].precision
;
7501 fields
[i
].explicit_xfb_buffer
=
7502 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7503 fields
[i
].xfb_buffer
=
7504 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7505 fields
[i
].xfb_stride
=
7506 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7510 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7513 * If a built-in interface block is redeclared, it must appear in
7514 * the shader before any use of any member included in the built-in
7515 * declaration, or a compilation error will result.
7517 * This appears to be a clarification to the behaviour established for
7518 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7519 * regardless of GLSL version.
7521 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7522 v
.run(instructions
);
7523 if (v
.usage_found()) {
7524 _mesa_glsl_error(&loc
, state
,
7525 "redeclaration of a built-in interface block must "
7526 "appear before any use of any member of the "
7531 const glsl_type
*block_type
=
7532 glsl_type::get_interface_instance(fields
,
7536 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7539 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7541 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7542 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7545 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7546 YYLTYPE loc
= this->get_location();
7547 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7548 "already taken in the current scope",
7549 this->block_name
, iface_type_name
);
7552 /* Since interface blocks cannot contain statements, it should be
7553 * impossible for the block to generate any instructions.
7555 assert(declared_variables
.is_empty());
7557 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7559 * Geometry shader input variables get the per-vertex values written
7560 * out by vertex shader output variables of the same names. Since a
7561 * geometry shader operates on a set of vertices, each input varying
7562 * variable (or input block, see interface blocks below) needs to be
7563 * declared as an array.
7565 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7566 var_mode
== ir_var_shader_in
) {
7567 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7568 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7569 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7570 !this->layout
.flags
.q
.patch
&&
7571 this->array_specifier
== NULL
&&
7572 var_mode
== ir_var_shader_in
) {
7573 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7574 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7575 !this->layout
.flags
.q
.patch
&&
7576 this->array_specifier
== NULL
&&
7577 var_mode
== ir_var_shader_out
) {
7578 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7582 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7585 * "If an instance name (instance-name) is used, then it puts all the
7586 * members inside a scope within its own name space, accessed with the
7587 * field selector ( . ) operator (analogously to structures)."
7589 if (this->instance_name
) {
7590 if (redeclaring_per_vertex
) {
7591 /* When a built-in in an unnamed interface block is redeclared,
7592 * get_variable_being_redeclared() calls
7593 * check_builtin_array_max_size() to make sure that built-in array
7594 * variables aren't redeclared to illegal sizes. But we're looking
7595 * at a redeclaration of a named built-in interface block. So we
7596 * have to manually call check_builtin_array_max_size() for all parts
7597 * of the interface that are arrays.
7599 for (unsigned i
= 0; i
< num_variables
; i
++) {
7600 if (fields
[i
].type
->is_array()) {
7601 const unsigned size
= fields
[i
].type
->array_size();
7602 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7606 validate_identifier(this->instance_name
, loc
, state
);
7611 if (this->array_specifier
!= NULL
) {
7612 const glsl_type
*block_array_type
=
7613 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7615 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7617 * For uniform blocks declared an array, each individual array
7618 * element corresponds to a separate buffer object backing one
7619 * instance of the block. As the array size indicates the number
7620 * of buffer objects needed, uniform block array declarations
7621 * must specify an array size.
7623 * And a few paragraphs later:
7625 * Geometry shader input blocks must be declared as arrays and
7626 * follow the array declaration and linking rules for all
7627 * geometry shader inputs. All other input and output block
7628 * arrays must specify an array size.
7630 * The same applies to tessellation shaders.
7632 * The upshot of this is that the only circumstance where an
7633 * interface array size *doesn't* need to be specified is on a
7634 * geometry shader input, tessellation control shader input,
7635 * tessellation control shader output, and tessellation evaluation
7638 if (block_array_type
->is_unsized_array()) {
7639 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7640 state
->stage
== MESA_SHADER_TESS_CTRL
||
7641 state
->stage
== MESA_SHADER_TESS_EVAL
;
7642 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7644 if (this->layout
.flags
.q
.in
) {
7646 _mesa_glsl_error(&loc
, state
,
7647 "unsized input block arrays not allowed in "
7649 _mesa_shader_stage_to_string(state
->stage
));
7650 } else if (this->layout
.flags
.q
.out
) {
7652 _mesa_glsl_error(&loc
, state
,
7653 "unsized output block arrays not allowed in "
7655 _mesa_shader_stage_to_string(state
->stage
));
7657 /* by elimination, this is a uniform block array */
7658 _mesa_glsl_error(&loc
, state
,
7659 "unsized uniform block arrays not allowed in "
7661 _mesa_shader_stage_to_string(state
->stage
));
7665 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7667 * * Arrays of arrays of blocks are not allowed
7669 if (state
->es_shader
&& block_array_type
->is_array() &&
7670 block_array_type
->fields
.array
->is_array()) {
7671 _mesa_glsl_error(&loc
, state
,
7672 "arrays of arrays interface blocks are "
7676 var
= new(state
) ir_variable(block_array_type
,
7677 this->instance_name
,
7680 var
= new(state
) ir_variable(block_type
,
7681 this->instance_name
,
7685 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7686 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7688 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7689 var
->data
.read_only
= true;
7691 var
->data
.patch
= this->layout
.flags
.q
.patch
;
7693 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7694 handle_geometry_shader_input_decl(state
, loc
, var
);
7695 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7696 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7697 handle_tess_shader_input_decl(state
, loc
, var
);
7698 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7699 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7701 for (unsigned i
= 0; i
< num_variables
; i
++) {
7702 if (var
->data
.mode
== ir_var_shader_storage
)
7703 apply_memory_qualifiers(var
, fields
[i
]);
7706 if (ir_variable
*earlier
=
7707 state
->symbols
->get_variable(this->instance_name
)) {
7708 if (!redeclaring_per_vertex
) {
7709 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7710 this->instance_name
);
7712 earlier
->data
.how_declared
= ir_var_declared_normally
;
7713 earlier
->type
= var
->type
;
7714 earlier
->reinit_interface_type(block_type
);
7717 if (this->layout
.flags
.q
.explicit_binding
) {
7718 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7722 var
->data
.stream
= qual_stream
;
7723 if (layout
.flags
.q
.explicit_location
) {
7724 var
->data
.location
= expl_location
;
7725 var
->data
.explicit_location
= true;
7728 state
->symbols
->add_variable(var
);
7729 instructions
->push_tail(var
);
7732 /* In order to have an array size, the block must also be declared with
7735 assert(this->array_specifier
== NULL
);
7737 for (unsigned i
= 0; i
< num_variables
; i
++) {
7739 new(state
) ir_variable(fields
[i
].type
,
7740 ralloc_strdup(state
, fields
[i
].name
),
7742 var
->data
.interpolation
= fields
[i
].interpolation
;
7743 var
->data
.centroid
= fields
[i
].centroid
;
7744 var
->data
.sample
= fields
[i
].sample
;
7745 var
->data
.patch
= fields
[i
].patch
;
7746 var
->data
.stream
= qual_stream
;
7747 var
->data
.location
= fields
[i
].location
;
7749 if (fields
[i
].location
!= -1)
7750 var
->data
.explicit_location
= true;
7752 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7753 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7755 if (fields
[i
].offset
!= -1)
7756 var
->data
.explicit_xfb_offset
= true;
7757 var
->data
.offset
= fields
[i
].offset
;
7759 var
->init_interface_type(block_type
);
7761 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7762 var
->data
.read_only
= true;
7764 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7765 if (state
->es_shader
) {
7766 var
->data
.precision
=
7767 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7771 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7772 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7773 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7775 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7778 if (var
->data
.mode
== ir_var_shader_storage
)
7779 apply_memory_qualifiers(var
, fields
[i
]);
7781 /* Examine var name here since var may get deleted in the next call */
7782 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7784 if (redeclaring_per_vertex
) {
7785 ir_variable
*earlier
=
7786 get_variable_being_redeclared(var
, loc
, state
,
7787 true /* allow_all_redeclarations */);
7788 if (!var_is_gl_id
|| earlier
== NULL
) {
7789 _mesa_glsl_error(&loc
, state
,
7790 "redeclaration of gl_PerVertex can only "
7791 "include built-in variables");
7792 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7793 _mesa_glsl_error(&loc
, state
,
7794 "`%s' has already been redeclared",
7797 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7798 earlier
->reinit_interface_type(block_type
);
7803 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7804 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7806 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7807 * The UBO declaration itself doesn't get an ir_variable unless it
7808 * has an instance name. This is ugly.
7810 if (this->layout
.flags
.q
.explicit_binding
) {
7811 apply_explicit_binding(state
, &loc
, var
,
7812 var
->get_interface_type(), &this->layout
);
7815 if (var
->type
->is_unsized_array()) {
7816 if (var
->is_in_shader_storage_block()) {
7817 if (is_unsized_array_last_element(var
)) {
7818 var
->data
.from_ssbo_unsized_array
= true;
7821 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7823 * "If an array is declared as the last member of a shader storage
7824 * block and the size is not specified at compile-time, it is
7825 * sized at run-time. In all other cases, arrays are sized only
7828 if (state
->es_shader
) {
7829 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
7830 "definition: only last member of a shader "
7831 "storage block can be defined as unsized "
7832 "array", fields
[i
].name
);
7837 state
->symbols
->add_variable(var
);
7838 instructions
->push_tail(var
);
7841 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7842 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7844 * It is also a compilation error ... to redeclare a built-in
7845 * block and then use a member from that built-in block that was
7846 * not included in the redeclaration.
7848 * This appears to be a clarification to the behaviour established
7849 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7850 * behaviour regardless of GLSL version.
7852 * To prevent the shader from using a member that was not included in
7853 * the redeclaration, we disable any ir_variables that are still
7854 * associated with the old declaration of gl_PerVertex (since we've
7855 * already updated all of the variables contained in the new
7856 * gl_PerVertex to point to it).
7858 * As a side effect this will prevent
7859 * validate_intrastage_interface_blocks() from getting confused and
7860 * thinking there are conflicting definitions of gl_PerVertex in the
7863 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7864 ir_variable
*const var
= node
->as_variable();
7866 var
->get_interface_type() == earlier_per_vertex
&&
7867 var
->data
.mode
== var_mode
) {
7868 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7869 _mesa_glsl_error(&loc
, state
,
7870 "redeclaration of gl_PerVertex cannot "
7871 "follow a redeclaration of `%s'",
7874 state
->symbols
->disable_variable(var
->name
);
7886 ast_tcs_output_layout::hir(exec_list
*instructions
,
7887 struct _mesa_glsl_parse_state
*state
)
7889 YYLTYPE loc
= this->get_location();
7891 unsigned num_vertices
;
7892 if (!state
->out_qualifier
->vertices
->
7893 process_qualifier_constant(state
, "vertices", &num_vertices
,
7895 /* return here to stop cascading incorrect error messages */
7899 /* If any shader outputs occurred before this declaration and specified an
7900 * array size, make sure the size they specified is consistent with the
7903 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7904 _mesa_glsl_error(&loc
, state
,
7905 "this tessellation control shader output layout "
7906 "specifies %u vertices, but a previous output "
7907 "is declared with size %u",
7908 num_vertices
, state
->tcs_output_size
);
7912 state
->tcs_output_vertices_specified
= true;
7914 /* If any shader outputs occurred before this declaration and did not
7915 * specify an array size, their size is determined now.
7917 foreach_in_list (ir_instruction
, node
, instructions
) {
7918 ir_variable
*var
= node
->as_variable();
7919 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7922 /* Note: Not all tessellation control shader output are arrays. */
7923 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7926 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7927 _mesa_glsl_error(&loc
, state
,
7928 "this tessellation control shader output layout "
7929 "specifies %u vertices, but an access to element "
7930 "%u of output `%s' already exists", num_vertices
,
7931 var
->data
.max_array_access
, var
->name
);
7933 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7943 ast_gs_input_layout::hir(exec_list
*instructions
,
7944 struct _mesa_glsl_parse_state
*state
)
7946 YYLTYPE loc
= this->get_location();
7948 /* Should have been prevented by the parser. */
7949 assert(!state
->gs_input_prim_type_specified
7950 || state
->in_qualifier
->prim_type
== this->prim_type
);
7952 /* If any shader inputs occurred before this declaration and specified an
7953 * array size, make sure the size they specified is consistent with the
7956 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7957 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7958 _mesa_glsl_error(&loc
, state
,
7959 "this geometry shader input layout implies %u vertices"
7960 " per primitive, but a previous input is declared"
7961 " with size %u", num_vertices
, state
->gs_input_size
);
7965 state
->gs_input_prim_type_specified
= true;
7967 /* If any shader inputs occurred before this declaration and did not
7968 * specify an array size, their size is determined now.
7970 foreach_in_list(ir_instruction
, node
, instructions
) {
7971 ir_variable
*var
= node
->as_variable();
7972 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7975 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7979 if (var
->type
->is_unsized_array()) {
7980 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7981 _mesa_glsl_error(&loc
, state
,
7982 "this geometry shader input layout implies %u"
7983 " vertices, but an access to element %u of input"
7984 " `%s' already exists", num_vertices
,
7985 var
->data
.max_array_access
, var
->name
);
7987 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7998 ast_cs_input_layout::hir(exec_list
*instructions
,
7999 struct _mesa_glsl_parse_state
*state
)
8001 YYLTYPE loc
= this->get_location();
8003 /* From the ARB_compute_shader specification:
8005 * If the local size of the shader in any dimension is greater
8006 * than the maximum size supported by the implementation for that
8007 * dimension, a compile-time error results.
8009 * It is not clear from the spec how the error should be reported if
8010 * the total size of the work group exceeds
8011 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8012 * report it at compile time as well.
8014 GLuint64 total_invocations
= 1;
8015 unsigned qual_local_size
[3];
8016 for (int i
= 0; i
< 3; i
++) {
8018 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8020 /* Infer a local_size of 1 for unspecified dimensions */
8021 if (this->local_size
[i
] == NULL
) {
8022 qual_local_size
[i
] = 1;
8023 } else if (!this->local_size
[i
]->
8024 process_qualifier_constant(state
, local_size_str
,
8025 &qual_local_size
[i
], false)) {
8026 ralloc_free(local_size_str
);
8029 ralloc_free(local_size_str
);
8031 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8032 _mesa_glsl_error(&loc
, state
,
8033 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8035 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8038 total_invocations
*= qual_local_size
[i
];
8039 if (total_invocations
>
8040 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8041 _mesa_glsl_error(&loc
, state
,
8042 "product of local_sizes exceeds "
8043 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8044 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8049 /* If any compute input layout declaration preceded this one, make sure it
8050 * was consistent with this one.
8052 if (state
->cs_input_local_size_specified
) {
8053 for (int i
= 0; i
< 3; i
++) {
8054 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8055 _mesa_glsl_error(&loc
, state
,
8056 "compute shader input layout does not match"
8057 " previous declaration");
8063 /* The ARB_compute_variable_group_size spec says:
8065 * If a compute shader including a *local_size_variable* qualifier also
8066 * declares a fixed local group size using the *local_size_x*,
8067 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8070 if (state
->cs_input_local_size_variable_specified
) {
8071 _mesa_glsl_error(&loc
, state
,
8072 "compute shader can't include both a variable and a "
8073 "fixed local group size");
8077 state
->cs_input_local_size_specified
= true;
8078 for (int i
= 0; i
< 3; i
++)
8079 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8081 /* We may now declare the built-in constant gl_WorkGroupSize (see
8082 * builtin_variable_generator::generate_constants() for why we didn't
8083 * declare it earlier).
8085 ir_variable
*var
= new(state
->symbols
)
8086 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8087 var
->data
.how_declared
= ir_var_declared_implicitly
;
8088 var
->data
.read_only
= true;
8089 instructions
->push_tail(var
);
8090 state
->symbols
->add_variable(var
);
8091 ir_constant_data data
;
8092 memset(&data
, 0, sizeof(data
));
8093 for (int i
= 0; i
< 3; i
++)
8094 data
.u
[i
] = qual_local_size
[i
];
8095 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8096 var
->constant_initializer
=
8097 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8098 var
->data
.has_initializer
= true;
8105 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8106 exec_list
*instructions
)
8108 bool gl_FragColor_assigned
= false;
8109 bool gl_FragData_assigned
= false;
8110 bool gl_FragSecondaryColor_assigned
= false;
8111 bool gl_FragSecondaryData_assigned
= false;
8112 bool user_defined_fs_output_assigned
= false;
8113 ir_variable
*user_defined_fs_output
= NULL
;
8115 /* It would be nice to have proper location information. */
8117 memset(&loc
, 0, sizeof(loc
));
8119 foreach_in_list(ir_instruction
, node
, instructions
) {
8120 ir_variable
*var
= node
->as_variable();
8122 if (!var
|| !var
->data
.assigned
)
8125 if (strcmp(var
->name
, "gl_FragColor") == 0)
8126 gl_FragColor_assigned
= true;
8127 else if (strcmp(var
->name
, "gl_FragData") == 0)
8128 gl_FragData_assigned
= true;
8129 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8130 gl_FragSecondaryColor_assigned
= true;
8131 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8132 gl_FragSecondaryData_assigned
= true;
8133 else if (!is_gl_identifier(var
->name
)) {
8134 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8135 var
->data
.mode
== ir_var_shader_out
) {
8136 user_defined_fs_output_assigned
= true;
8137 user_defined_fs_output
= var
;
8142 /* From the GLSL 1.30 spec:
8144 * "If a shader statically assigns a value to gl_FragColor, it
8145 * may not assign a value to any element of gl_FragData. If a
8146 * shader statically writes a value to any element of
8147 * gl_FragData, it may not assign a value to
8148 * gl_FragColor. That is, a shader may assign values to either
8149 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8150 * linked together must also consistently write just one of
8151 * these variables. Similarly, if user declared output
8152 * variables are in use (statically assigned to), then the
8153 * built-in variables gl_FragColor and gl_FragData may not be
8154 * assigned to. These incorrect usages all generate compile
8157 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8158 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8159 "`gl_FragColor' and `gl_FragData'");
8160 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8161 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8162 "`gl_FragColor' and `%s'",
8163 user_defined_fs_output
->name
);
8164 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8165 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8166 "`gl_FragSecondaryColorEXT' and"
8167 " `gl_FragSecondaryDataEXT'");
8168 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8169 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8170 "`gl_FragColor' and"
8171 " `gl_FragSecondaryDataEXT'");
8172 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8173 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8175 " `gl_FragSecondaryColorEXT'");
8176 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8177 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8178 "`gl_FragData' and `%s'",
8179 user_defined_fs_output
->name
);
8182 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8183 !state
->EXT_blend_func_extended_enable
) {
8184 _mesa_glsl_error(&loc
, state
,
8185 "Dual source blending requires EXT_blend_func_extended");
8191 remove_per_vertex_blocks(exec_list
*instructions
,
8192 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8194 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8195 * if it exists in this shader type.
8197 const glsl_type
*per_vertex
= NULL
;
8199 case ir_var_shader_in
:
8200 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8201 per_vertex
= gl_in
->get_interface_type();
8203 case ir_var_shader_out
:
8204 if (ir_variable
*gl_Position
=
8205 state
->symbols
->get_variable("gl_Position")) {
8206 per_vertex
= gl_Position
->get_interface_type();
8210 assert(!"Unexpected mode");
8214 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8215 * need to do anything.
8217 if (per_vertex
== NULL
)
8220 /* If the interface block is used by the shader, then we don't need to do
8223 interface_block_usage_visitor
v(mode
, per_vertex
);
8224 v
.run(instructions
);
8225 if (v
.usage_found())
8228 /* Remove any ir_variable declarations that refer to the interface block
8231 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8232 ir_variable
*const var
= node
->as_variable();
8233 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8234 var
->data
.mode
== mode
) {
8235 state
->symbols
->disable_variable(var
->name
);