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
.post_depth_coverage
) {
3637 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3638 "valid in fragment shader input layout declaration.");
3643 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3645 struct _mesa_glsl_parse_state
*state
,
3649 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3651 if (qual
->flags
.q
.invariant
) {
3652 if (var
->data
.used
) {
3653 _mesa_glsl_error(loc
, state
,
3654 "variable `%s' may not be redeclared "
3655 "`invariant' after being used",
3658 var
->data
.invariant
= 1;
3662 if (qual
->flags
.q
.precise
) {
3663 if (var
->data
.used
) {
3664 _mesa_glsl_error(loc
, state
,
3665 "variable `%s' may not be redeclared "
3666 "`precise' after being used",
3669 var
->data
.precise
= 1;
3673 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3674 _mesa_glsl_error(loc
, state
,
3675 "`subroutine' may only be applied to uniforms, "
3676 "subroutine type declarations, or function definitions");
3679 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3680 || qual
->flags
.q
.uniform
3681 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3682 var
->data
.read_only
= 1;
3684 if (qual
->flags
.q
.centroid
)
3685 var
->data
.centroid
= 1;
3687 if (qual
->flags
.q
.sample
)
3688 var
->data
.sample
= 1;
3690 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3691 if (state
->es_shader
) {
3692 var
->data
.precision
=
3693 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3696 if (qual
->flags
.q
.patch
)
3697 var
->data
.patch
= 1;
3699 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3700 var
->type
= glsl_type::error_type
;
3701 _mesa_glsl_error(loc
, state
,
3702 "`attribute' variables may not be declared in the "
3704 _mesa_shader_stage_to_string(state
->stage
));
3707 /* Disallow layout qualifiers which may only appear on layout declarations. */
3708 if (qual
->flags
.q
.prim_type
) {
3709 _mesa_glsl_error(loc
, state
,
3710 "Primitive type may only be specified on GS input or output "
3711 "layout declaration, not on variables.");
3714 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3716 * "However, the const qualifier cannot be used with out or inout."
3718 * The same section of the GLSL 4.40 spec further clarifies this saying:
3720 * "The const qualifier cannot be used with out or inout, or a
3721 * compile-time error results."
3723 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3724 _mesa_glsl_error(loc
, state
,
3725 "`const' may not be applied to `out' or `inout' "
3726 "function parameters");
3729 /* If there is no qualifier that changes the mode of the variable, leave
3730 * the setting alone.
3732 assert(var
->data
.mode
!= ir_var_temporary
);
3733 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3734 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
3735 else if (qual
->flags
.q
.in
)
3736 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3737 else if (qual
->flags
.q
.attribute
3738 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3739 var
->data
.mode
= ir_var_shader_in
;
3740 else if (qual
->flags
.q
.out
)
3741 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3742 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3743 var
->data
.mode
= ir_var_shader_out
;
3744 else if (qual
->flags
.q
.uniform
)
3745 var
->data
.mode
= ir_var_uniform
;
3746 else if (qual
->flags
.q
.buffer
)
3747 var
->data
.mode
= ir_var_shader_storage
;
3748 else if (qual
->flags
.q
.shared_storage
)
3749 var
->data
.mode
= ir_var_shader_shared
;
3751 var
->data
.fb_fetch_output
= state
->stage
== MESA_SHADER_FRAGMENT
&&
3752 qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
3754 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3755 /* User-defined ins/outs are not permitted in compute shaders. */
3756 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3757 _mesa_glsl_error(loc
, state
,
3758 "user-defined input and output variables are not "
3759 "permitted in compute shaders");
3762 /* This variable is being used to link data between shader stages (in
3763 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3764 * that is allowed for such purposes.
3766 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3768 * "The varying qualifier can be used only with the data types
3769 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3772 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3773 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3775 * "Fragment inputs can only be signed and unsigned integers and
3776 * integer vectors, float, floating-point vectors, matrices, or
3777 * arrays of these. Structures cannot be input.
3779 * Similar text exists in the section on vertex shader outputs.
3781 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3782 * 3.00 spec allows structs as well. Varying structs are also allowed
3785 switch (var
->type
->get_scalar_type()->base_type
) {
3786 case GLSL_TYPE_FLOAT
:
3787 /* Ok in all GLSL versions */
3789 case GLSL_TYPE_UINT
:
3791 if (state
->is_version(130, 300))
3793 _mesa_glsl_error(loc
, state
,
3794 "varying variables must be of base type float in %s",
3795 state
->get_version_string());
3797 case GLSL_TYPE_STRUCT
:
3798 if (state
->is_version(150, 300))
3800 _mesa_glsl_error(loc
, state
,
3801 "varying variables may not be of type struct");
3803 case GLSL_TYPE_DOUBLE
:
3806 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3811 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3812 switch (state
->stage
) {
3813 case MESA_SHADER_VERTEX
:
3814 if (var
->data
.mode
== ir_var_shader_out
)
3815 var
->data
.invariant
= true;
3817 case MESA_SHADER_TESS_CTRL
:
3818 case MESA_SHADER_TESS_EVAL
:
3819 case MESA_SHADER_GEOMETRY
:
3820 if ((var
->data
.mode
== ir_var_shader_in
)
3821 || (var
->data
.mode
== ir_var_shader_out
))
3822 var
->data
.invariant
= true;
3824 case MESA_SHADER_FRAGMENT
:
3825 if (var
->data
.mode
== ir_var_shader_in
)
3826 var
->data
.invariant
= true;
3828 case MESA_SHADER_COMPUTE
:
3829 /* Invariance isn't meaningful in compute shaders. */
3834 var
->data
.interpolation
=
3835 interpret_interpolation_qualifier(qual
, var
->type
,
3836 (ir_variable_mode
) var
->data
.mode
,
3839 /* Does the declaration use the deprecated 'attribute' or 'varying'
3842 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3843 || qual
->flags
.q
.varying
;
3846 /* Validate auxiliary storage qualifiers */
3848 /* From section 4.3.4 of the GLSL 1.30 spec:
3849 * "It is an error to use centroid in in a vertex shader."
3851 * From section 4.3.4 of the GLSL ES 3.00 spec:
3852 * "It is an error to use centroid in or interpolation qualifiers in
3853 * a vertex shader input."
3856 /* Section 4.3.6 of the GLSL 1.30 specification states:
3857 * "It is an error to use centroid out in a fragment shader."
3859 * The GL_ARB_shading_language_420pack extension specification states:
3860 * "It is an error to use auxiliary storage qualifiers or interpolation
3861 * qualifiers on an output in a fragment shader."
3863 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3864 _mesa_glsl_error(loc
, state
,
3865 "sample qualifier may only be used on `in` or `out` "
3866 "variables between shader stages");
3868 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3869 _mesa_glsl_error(loc
, state
,
3870 "centroid qualifier may only be used with `in', "
3871 "`out' or `varying' variables between shader stages");
3874 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3875 _mesa_glsl_error(loc
, state
,
3876 "the shared storage qualifiers can only be used with "
3880 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3884 * Get the variable that is being redeclared by this declaration
3886 * Semantic checks to verify the validity of the redeclaration are also
3887 * performed. If semantic checks fail, compilation error will be emitted via
3888 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3891 * A pointer to an existing variable in the current scope if the declaration
3892 * is a redeclaration, \c NULL otherwise.
3894 static ir_variable
*
3895 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3896 struct _mesa_glsl_parse_state
*state
,
3897 bool allow_all_redeclarations
)
3899 /* Check if this declaration is actually a re-declaration, either to
3900 * resize an array or add qualifiers to an existing variable.
3902 * This is allowed for variables in the current scope, or when at
3903 * global scope (for built-ins in the implicit outer scope).
3905 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3906 if (earlier
== NULL
||
3907 (state
->current_function
!= NULL
&&
3908 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3913 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3915 * "It is legal to declare an array without a size and then
3916 * later re-declare the same name as an array of the same
3917 * type and specify a size."
3919 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3920 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3921 /* FINISHME: This doesn't match the qualifiers on the two
3922 * FINISHME: declarations. It's not 100% clear whether this is
3923 * FINISHME: required or not.
3926 const int size
= var
->type
->array_size();
3927 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3928 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3929 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3931 earlier
->data
.max_array_access
);
3934 earlier
->type
= var
->type
;
3937 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3938 state
->is_version(150, 0))
3939 && strcmp(var
->name
, "gl_FragCoord") == 0
3940 && earlier
->type
== var
->type
3941 && var
->data
.mode
== ir_var_shader_in
) {
3942 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3945 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3946 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3948 /* According to section 4.3.7 of the GLSL 1.30 spec,
3949 * the following built-in varaibles can be redeclared with an
3950 * interpolation qualifier:
3953 * * gl_FrontSecondaryColor
3954 * * gl_BackSecondaryColor
3956 * * gl_SecondaryColor
3958 } else if (state
->is_version(130, 0)
3959 && (strcmp(var
->name
, "gl_FrontColor") == 0
3960 || strcmp(var
->name
, "gl_BackColor") == 0
3961 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3962 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3963 || strcmp(var
->name
, "gl_Color") == 0
3964 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3965 && earlier
->type
== var
->type
3966 && earlier
->data
.mode
== var
->data
.mode
) {
3967 earlier
->data
.interpolation
= var
->data
.interpolation
;
3969 /* Layout qualifiers for gl_FragDepth. */
3970 } else if ((state
->is_version(420, 0) ||
3971 state
->AMD_conservative_depth_enable
||
3972 state
->ARB_conservative_depth_enable
)
3973 && strcmp(var
->name
, "gl_FragDepth") == 0
3974 && earlier
->type
== var
->type
3975 && earlier
->data
.mode
== var
->data
.mode
) {
3977 /** From the AMD_conservative_depth spec:
3978 * Within any shader, the first redeclarations of gl_FragDepth
3979 * must appear before any use of gl_FragDepth.
3981 if (earlier
->data
.used
) {
3982 _mesa_glsl_error(&loc
, state
,
3983 "the first redeclaration of gl_FragDepth "
3984 "must appear before any use of gl_FragDepth");
3987 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3988 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3989 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3990 _mesa_glsl_error(&loc
, state
,
3991 "gl_FragDepth: depth layout is declared here "
3992 "as '%s, but it was previously declared as "
3994 depth_layout_string(var
->data
.depth_layout
),
3995 depth_layout_string(earlier
->data
.depth_layout
));
3998 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4000 } else if (state
->has_framebuffer_fetch() &&
4001 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4002 var
->type
== earlier
->type
&&
4003 var
->data
.mode
== ir_var_auto
) {
4004 /* According to the EXT_shader_framebuffer_fetch spec:
4006 * "By default, gl_LastFragData is declared with the mediump precision
4007 * qualifier. This can be changed by redeclaring the corresponding
4008 * variables with the desired precision qualifier."
4010 earlier
->data
.precision
= var
->data
.precision
;
4012 } else if (allow_all_redeclarations
) {
4013 if (earlier
->data
.mode
!= var
->data
.mode
) {
4014 _mesa_glsl_error(&loc
, state
,
4015 "redeclaration of `%s' with incorrect qualifiers",
4017 } else if (earlier
->type
!= var
->type
) {
4018 _mesa_glsl_error(&loc
, state
,
4019 "redeclaration of `%s' has incorrect type",
4023 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4030 * Generate the IR for an initializer in a variable declaration
4033 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4034 ast_fully_specified_type
*type
,
4035 exec_list
*initializer_instructions
,
4036 struct _mesa_glsl_parse_state
*state
)
4038 ir_rvalue
*result
= NULL
;
4040 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4042 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4044 * "All uniform variables are read-only and are initialized either
4045 * directly by an application via API commands, or indirectly by
4048 if (var
->data
.mode
== ir_var_uniform
) {
4049 state
->check_version(120, 0, &initializer_loc
,
4050 "cannot initialize uniform %s",
4054 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4056 * "Buffer variables cannot have initializers."
4058 if (var
->data
.mode
== ir_var_shader_storage
) {
4059 _mesa_glsl_error(&initializer_loc
, state
,
4060 "cannot initialize buffer variable %s",
4064 /* From section 4.1.7 of the GLSL 4.40 spec:
4066 * "Opaque variables [...] are initialized only through the
4067 * OpenGL API; they cannot be declared with an initializer in a
4070 if (var
->type
->contains_opaque()) {
4071 _mesa_glsl_error(&initializer_loc
, state
,
4072 "cannot initialize opaque variable %s",
4076 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4077 _mesa_glsl_error(&initializer_loc
, state
,
4078 "cannot initialize %s shader input / %s %s",
4079 _mesa_shader_stage_to_string(state
->stage
),
4080 (state
->stage
== MESA_SHADER_VERTEX
)
4081 ? "attribute" : "varying",
4085 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4086 _mesa_glsl_error(&initializer_loc
, state
,
4087 "cannot initialize %s shader output %s",
4088 _mesa_shader_stage_to_string(state
->stage
),
4092 /* If the initializer is an ast_aggregate_initializer, recursively store
4093 * type information from the LHS into it, so that its hir() function can do
4096 if (decl
->initializer
->oper
== ast_aggregate
)
4097 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4099 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4100 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4102 /* Calculate the constant value if this is a const or uniform
4105 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4107 * "Declarations of globals without a storage qualifier, or with
4108 * just the const qualifier, may include initializers, in which case
4109 * they will be initialized before the first line of main() is
4110 * executed. Such initializers must be a constant expression."
4112 * The same section of the GLSL ES 3.00.4 spec has similar language.
4114 if (type
->qualifier
.flags
.q
.constant
4115 || type
->qualifier
.flags
.q
.uniform
4116 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4117 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4119 if (new_rhs
!= NULL
) {
4122 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4125 * "A constant expression is one of
4129 * - an expression formed by an operator on operands that are
4130 * all constant expressions, including getting an element of
4131 * a constant array, or a field of a constant structure, or
4132 * components of a constant vector. However, the sequence
4133 * operator ( , ) and the assignment operators ( =, +=, ...)
4134 * are not included in the operators that can create a
4135 * constant expression."
4137 * Section 12.43 (Sequence operator and constant expressions) says:
4139 * "Should the following construct be allowed?
4143 * The expression within the brackets uses the sequence operator
4144 * (',') and returns the integer 3 so the construct is declaring
4145 * a single-dimensional array of size 3. In some languages, the
4146 * construct declares a two-dimensional array. It would be
4147 * preferable to make this construct illegal to avoid confusion.
4149 * One possibility is to change the definition of the sequence
4150 * operator so that it does not return a constant-expression and
4151 * hence cannot be used to declare an array size.
4153 * RESOLUTION: The result of a sequence operator is not a
4154 * constant-expression."
4156 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4157 * contains language almost identical to the section 4.3.3 in the
4158 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4161 ir_constant
*constant_value
= rhs
->constant_expression_value();
4162 if (!constant_value
||
4163 (state
->is_version(430, 300) &&
4164 decl
->initializer
->has_sequence_subexpression())) {
4165 const char *const variable_mode
=
4166 (type
->qualifier
.flags
.q
.constant
)
4168 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4170 /* If ARB_shading_language_420pack is enabled, initializers of
4171 * const-qualified local variables do not have to be constant
4172 * expressions. Const-qualified global variables must still be
4173 * initialized with constant expressions.
4175 if (!state
->has_420pack()
4176 || state
->current_function
== NULL
) {
4177 _mesa_glsl_error(& initializer_loc
, state
,
4178 "initializer of %s variable `%s' must be a "
4179 "constant expression",
4182 if (var
->type
->is_numeric()) {
4183 /* Reduce cascading errors. */
4184 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4185 ? ir_constant::zero(state
, var
->type
) : NULL
;
4189 rhs
= constant_value
;
4190 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4191 ? constant_value
: NULL
;
4194 if (var
->type
->is_numeric()) {
4195 /* Reduce cascading errors. */
4196 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4197 ? ir_constant::zero(state
, var
->type
) : NULL
;
4202 if (rhs
&& !rhs
->type
->is_error()) {
4203 bool temp
= var
->data
.read_only
;
4204 if (type
->qualifier
.flags
.q
.constant
)
4205 var
->data
.read_only
= false;
4207 /* Never emit code to initialize a uniform.
4209 const glsl_type
*initializer_type
;
4210 if (!type
->qualifier
.flags
.q
.uniform
) {
4211 do_assignment(initializer_instructions
, state
,
4216 type
->get_location());
4217 initializer_type
= result
->type
;
4219 initializer_type
= rhs
->type
;
4221 var
->constant_initializer
= rhs
->constant_expression_value();
4222 var
->data
.has_initializer
= true;
4224 /* If the declared variable is an unsized array, it must inherrit
4225 * its full type from the initializer. A declaration such as
4227 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4231 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4233 * The assignment generated in the if-statement (below) will also
4234 * automatically handle this case for non-uniforms.
4236 * If the declared variable is not an array, the types must
4237 * already match exactly. As a result, the type assignment
4238 * here can be done unconditionally. For non-uniforms the call
4239 * to do_assignment can change the type of the initializer (via
4240 * the implicit conversion rules). For uniforms the initializer
4241 * must be a constant expression, and the type of that expression
4242 * was validated above.
4244 var
->type
= initializer_type
;
4246 var
->data
.read_only
= temp
;
4253 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4254 YYLTYPE loc
, ir_variable
*var
,
4255 unsigned num_vertices
,
4257 const char *var_category
)
4259 if (var
->type
->is_unsized_array()) {
4260 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4262 * All geometry shader input unsized array declarations will be
4263 * sized by an earlier input layout qualifier, when present, as per
4264 * the following table.
4266 * Followed by a table mapping each allowed input layout qualifier to
4267 * the corresponding input length.
4269 * Similarly for tessellation control shader outputs.
4271 if (num_vertices
!= 0)
4272 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4275 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4276 * includes the following examples of compile-time errors:
4278 * // code sequence within one shader...
4279 * in vec4 Color1[]; // size unknown
4280 * ...Color1.length()...// illegal, length() unknown
4281 * in vec4 Color2[2]; // size is 2
4282 * ...Color1.length()...// illegal, Color1 still has no size
4283 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4284 * layout(lines) in; // legal, input size is 2, matching
4285 * in vec4 Color4[3]; // illegal, contradicts layout
4288 * To detect the case illustrated by Color3, we verify that the size of
4289 * an explicitly-sized array matches the size of any previously declared
4290 * explicitly-sized array. To detect the case illustrated by Color4, we
4291 * verify that the size of an explicitly-sized array is consistent with
4292 * any previously declared input layout.
4294 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4295 _mesa_glsl_error(&loc
, state
,
4296 "%s size contradicts previously declared layout "
4297 "(size is %u, but layout requires a size of %u)",
4298 var_category
, var
->type
->length
, num_vertices
);
4299 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4300 _mesa_glsl_error(&loc
, state
,
4301 "%s sizes are inconsistent (size is %u, but a "
4302 "previous declaration has size %u)",
4303 var_category
, var
->type
->length
, *size
);
4305 *size
= var
->type
->length
;
4311 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4312 YYLTYPE loc
, ir_variable
*var
)
4314 unsigned num_vertices
= 0;
4316 if (state
->tcs_output_vertices_specified
) {
4317 if (!state
->out_qualifier
->vertices
->
4318 process_qualifier_constant(state
, "vertices",
4319 &num_vertices
, false)) {
4323 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4324 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4325 "GL_MAX_PATCH_VERTICES", num_vertices
);
4330 if (!var
->type
->is_array() && !var
->data
.patch
) {
4331 _mesa_glsl_error(&loc
, state
,
4332 "tessellation control shader outputs must be arrays");
4334 /* To avoid cascading failures, short circuit the checks below. */
4338 if (var
->data
.patch
)
4341 var
->data
.tess_varying_implicit_sized_array
= var
->type
->is_unsized_array();
4343 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4344 &state
->tcs_output_size
,
4345 "tessellation control shader output");
4349 * Do additional processing necessary for tessellation control/evaluation shader
4350 * input declarations. This covers both interface block arrays and bare input
4354 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4355 YYLTYPE loc
, ir_variable
*var
)
4357 if (!var
->type
->is_array() && !var
->data
.patch
) {
4358 _mesa_glsl_error(&loc
, state
,
4359 "per-vertex tessellation shader inputs must be arrays");
4360 /* Avoid cascading failures. */
4364 if (var
->data
.patch
)
4367 /* The ARB_tessellation_shader spec says:
4369 * "Declaring an array size is optional. If no size is specified, it
4370 * will be taken from the implementation-dependent maximum patch size
4371 * (gl_MaxPatchVertices). If a size is specified, it must match the
4372 * maximum patch size; otherwise, a compile or link error will occur."
4374 * This text appears twice, once for TCS inputs, and again for TES inputs.
4376 if (var
->type
->is_unsized_array()) {
4377 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4378 state
->Const
.MaxPatchVertices
);
4379 var
->data
.tess_varying_implicit_sized_array
= true;
4380 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4381 _mesa_glsl_error(&loc
, state
,
4382 "per-vertex tessellation shader input arrays must be "
4383 "sized to gl_MaxPatchVertices (%d).",
4384 state
->Const
.MaxPatchVertices
);
4390 * Do additional processing necessary for geometry shader input declarations
4391 * (this covers both interface blocks arrays and bare input variables).
4394 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4395 YYLTYPE loc
, ir_variable
*var
)
4397 unsigned num_vertices
= 0;
4399 if (state
->gs_input_prim_type_specified
) {
4400 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4403 /* Geometry shader input variables must be arrays. Caller should have
4404 * reported an error for this.
4406 if (!var
->type
->is_array()) {
4407 assert(state
->error
);
4409 /* To avoid cascading failures, short circuit the checks below. */
4413 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4414 &state
->gs_input_size
,
4415 "geometry shader input");
4419 validate_identifier(const char *identifier
, YYLTYPE loc
,
4420 struct _mesa_glsl_parse_state
*state
)
4422 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4424 * "Identifiers starting with "gl_" are reserved for use by
4425 * OpenGL, and may not be declared in a shader as either a
4426 * variable or a function."
4428 if (is_gl_identifier(identifier
)) {
4429 _mesa_glsl_error(&loc
, state
,
4430 "identifier `%s' uses reserved `gl_' prefix",
4432 } else if (strstr(identifier
, "__")) {
4433 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4436 * "In addition, all identifiers containing two
4437 * consecutive underscores (__) are reserved as
4438 * possible future keywords."
4440 * The intention is that names containing __ are reserved for internal
4441 * use by the implementation, and names prefixed with GL_ are reserved
4442 * for use by Khronos. Names simply containing __ are dangerous to use,
4443 * but should be allowed.
4445 * A future version of the GLSL specification will clarify this.
4447 _mesa_glsl_warning(&loc
, state
,
4448 "identifier `%s' uses reserved `__' string",
4454 ast_declarator_list::hir(exec_list
*instructions
,
4455 struct _mesa_glsl_parse_state
*state
)
4458 const struct glsl_type
*decl_type
;
4459 const char *type_name
= NULL
;
4460 ir_rvalue
*result
= NULL
;
4461 YYLTYPE loc
= this->get_location();
4463 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4465 * "To ensure that a particular output variable is invariant, it is
4466 * necessary to use the invariant qualifier. It can either be used to
4467 * qualify a previously declared variable as being invariant
4469 * invariant gl_Position; // make existing gl_Position be invariant"
4471 * In these cases the parser will set the 'invariant' flag in the declarator
4472 * list, and the type will be NULL.
4474 if (this->invariant
) {
4475 assert(this->type
== NULL
);
4477 if (state
->current_function
!= NULL
) {
4478 _mesa_glsl_error(& loc
, state
,
4479 "all uses of `invariant' keyword must be at global "
4483 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4484 assert(decl
->array_specifier
== NULL
);
4485 assert(decl
->initializer
== NULL
);
4487 ir_variable
*const earlier
=
4488 state
->symbols
->get_variable(decl
->identifier
);
4489 if (earlier
== NULL
) {
4490 _mesa_glsl_error(& loc
, state
,
4491 "undeclared variable `%s' cannot be marked "
4492 "invariant", decl
->identifier
);
4493 } else if (!is_varying_var(earlier
, state
->stage
)) {
4494 _mesa_glsl_error(&loc
, state
,
4495 "`%s' cannot be marked invariant; interfaces between "
4496 "shader stages only.", decl
->identifier
);
4497 } else if (earlier
->data
.used
) {
4498 _mesa_glsl_error(& loc
, state
,
4499 "variable `%s' may not be redeclared "
4500 "`invariant' after being used",
4503 earlier
->data
.invariant
= true;
4507 /* Invariant redeclarations do not have r-values.
4512 if (this->precise
) {
4513 assert(this->type
== NULL
);
4515 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4516 assert(decl
->array_specifier
== NULL
);
4517 assert(decl
->initializer
== NULL
);
4519 ir_variable
*const earlier
=
4520 state
->symbols
->get_variable(decl
->identifier
);
4521 if (earlier
== NULL
) {
4522 _mesa_glsl_error(& loc
, state
,
4523 "undeclared variable `%s' cannot be marked "
4524 "precise", decl
->identifier
);
4525 } else if (state
->current_function
!= NULL
&&
4526 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4527 /* Note: we have to check if we're in a function, since
4528 * builtins are treated as having come from another scope.
4530 _mesa_glsl_error(& loc
, state
,
4531 "variable `%s' from an outer scope may not be "
4532 "redeclared `precise' in this scope",
4534 } else if (earlier
->data
.used
) {
4535 _mesa_glsl_error(& loc
, state
,
4536 "variable `%s' may not be redeclared "
4537 "`precise' after being used",
4540 earlier
->data
.precise
= true;
4544 /* Precise redeclarations do not have r-values either. */
4548 assert(this->type
!= NULL
);
4549 assert(!this->invariant
);
4550 assert(!this->precise
);
4552 /* The type specifier may contain a structure definition. Process that
4553 * before any of the variable declarations.
4555 (void) this->type
->specifier
->hir(instructions
, state
);
4557 decl_type
= this->type
->glsl_type(& type_name
, state
);
4559 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4560 * "Buffer variables may only be declared inside interface blocks
4561 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4562 * shader storage blocks. It is a compile-time error to declare buffer
4563 * variables at global scope (outside a block)."
4565 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4566 _mesa_glsl_error(&loc
, state
,
4567 "buffer variables cannot be declared outside "
4568 "interface blocks");
4571 /* An offset-qualified atomic counter declaration sets the default
4572 * offset for the next declaration within the same atomic counter
4575 if (decl_type
&& decl_type
->contains_atomic()) {
4576 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4577 type
->qualifier
.flags
.q
.explicit_offset
) {
4578 unsigned qual_binding
;
4579 unsigned qual_offset
;
4580 if (process_qualifier_constant(state
, &loc
, "binding",
4581 type
->qualifier
.binding
,
4583 && process_qualifier_constant(state
, &loc
, "offset",
4584 type
->qualifier
.offset
,
4586 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4590 ast_type_qualifier allowed_atomic_qual_mask
;
4591 allowed_atomic_qual_mask
.flags
.i
= 0;
4592 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4593 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4594 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4596 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4597 "invalid layout qualifier for",
4601 if (this->declarations
.is_empty()) {
4602 /* If there is no structure involved in the program text, there are two
4603 * possible scenarios:
4605 * - The program text contained something like 'vec4;'. This is an
4606 * empty declaration. It is valid but weird. Emit a warning.
4608 * - The program text contained something like 'S;' and 'S' is not the
4609 * name of a known structure type. This is both invalid and weird.
4612 * - The program text contained something like 'mediump float;'
4613 * when the programmer probably meant 'precision mediump
4614 * float;' Emit a warning with a description of what they
4615 * probably meant to do.
4617 * Note that if decl_type is NULL and there is a structure involved,
4618 * there must have been some sort of error with the structure. In this
4619 * case we assume that an error was already generated on this line of
4620 * code for the structure. There is no need to generate an additional,
4623 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4626 if (decl_type
== NULL
) {
4627 _mesa_glsl_error(&loc
, state
,
4628 "invalid type `%s' in empty declaration",
4631 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4632 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4635 * "... any declaration that leaves the size undefined is
4636 * disallowed as this would add complexity and there are no
4639 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4640 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4641 "or implicitly defined");
4644 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4646 * "The combinations of types and qualifiers that cause
4647 * compile-time or link-time errors are the same whether or not
4648 * the declaration is empty."
4650 validate_array_dimensions(decl_type
, state
, &loc
);
4653 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4654 /* Empty atomic counter declarations are allowed and useful
4655 * to set the default offset qualifier.
4658 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4659 if (this->type
->specifier
->structure
!= NULL
) {
4660 _mesa_glsl_error(&loc
, state
,
4661 "precision qualifiers can't be applied "
4664 static const char *const precision_names
[] = {
4671 _mesa_glsl_warning(&loc
, state
,
4672 "empty declaration with precision "
4673 "qualifier, to set the default precision, "
4674 "use `precision %s %s;'",
4675 precision_names
[this->type
->
4676 qualifier
.precision
],
4679 } else if (this->type
->specifier
->structure
== NULL
) {
4680 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4685 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4686 const struct glsl_type
*var_type
;
4688 const char *identifier
= decl
->identifier
;
4689 /* FINISHME: Emit a warning if a variable declaration shadows a
4690 * FINISHME: declaration at a higher scope.
4693 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4694 if (type_name
!= NULL
) {
4695 _mesa_glsl_error(& loc
, state
,
4696 "invalid type `%s' in declaration of `%s'",
4697 type_name
, decl
->identifier
);
4699 _mesa_glsl_error(& loc
, state
,
4700 "invalid type in declaration of `%s'",
4706 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4710 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4712 _mesa_glsl_error(& loc
, state
,
4713 "invalid type in declaration of `%s'",
4715 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4720 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4723 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4725 /* The 'varying in' and 'varying out' qualifiers can only be used with
4726 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4729 if (this->type
->qualifier
.flags
.q
.varying
) {
4730 if (this->type
->qualifier
.flags
.q
.in
) {
4731 _mesa_glsl_error(& loc
, state
,
4732 "`varying in' qualifier in declaration of "
4733 "`%s' only valid for geometry shaders using "
4734 "ARB_geometry_shader4 or EXT_geometry_shader4",
4736 } else if (this->type
->qualifier
.flags
.q
.out
) {
4737 _mesa_glsl_error(& loc
, state
,
4738 "`varying out' qualifier in declaration of "
4739 "`%s' only valid for geometry shaders using "
4740 "ARB_geometry_shader4 or EXT_geometry_shader4",
4745 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4747 * "Global variables can only use the qualifiers const,
4748 * attribute, uniform, or varying. Only one may be
4751 * Local variables can only use the qualifier const."
4753 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4754 * any extension that adds the 'layout' keyword.
4756 if (!state
->is_version(130, 300)
4757 && !state
->has_explicit_attrib_location()
4758 && !state
->has_separate_shader_objects()
4759 && !state
->ARB_fragment_coord_conventions_enable
) {
4760 if (this->type
->qualifier
.flags
.q
.out
) {
4761 _mesa_glsl_error(& loc
, state
,
4762 "`out' qualifier in declaration of `%s' "
4763 "only valid for function parameters in %s",
4764 decl
->identifier
, state
->get_version_string());
4766 if (this->type
->qualifier
.flags
.q
.in
) {
4767 _mesa_glsl_error(& loc
, state
,
4768 "`in' qualifier in declaration of `%s' "
4769 "only valid for function parameters in %s",
4770 decl
->identifier
, state
->get_version_string());
4772 /* FINISHME: Test for other invalid qualifiers. */
4775 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4777 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4780 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
4781 && (var
->type
->is_numeric() || var
->type
->is_boolean())
4782 && state
->zero_init
) {
4783 const ir_constant_data data
= {0};
4784 var
->data
.has_initializer
= true;
4785 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
4788 if (this->type
->qualifier
.flags
.q
.invariant
) {
4789 if (!is_varying_var(var
, state
->stage
)) {
4790 _mesa_glsl_error(&loc
, state
,
4791 "`%s' cannot be marked invariant; interfaces between "
4792 "shader stages only", var
->name
);
4796 if (state
->current_function
!= NULL
) {
4797 const char *mode
= NULL
;
4798 const char *extra
= "";
4800 /* There is no need to check for 'inout' here because the parser will
4801 * only allow that in function parameter lists.
4803 if (this->type
->qualifier
.flags
.q
.attribute
) {
4805 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4806 mode
= "subroutine uniform";
4807 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4809 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4811 } else if (this->type
->qualifier
.flags
.q
.in
) {
4813 extra
= " or in function parameter list";
4814 } else if (this->type
->qualifier
.flags
.q
.out
) {
4816 extra
= " or in function parameter list";
4820 _mesa_glsl_error(& loc
, state
,
4821 "%s variable `%s' must be declared at "
4823 mode
, var
->name
, extra
);
4825 } else if (var
->data
.mode
== ir_var_shader_in
) {
4826 var
->data
.read_only
= true;
4828 if (state
->stage
== MESA_SHADER_VERTEX
) {
4829 bool error_emitted
= false;
4831 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4833 * "Vertex shader inputs can only be float, floating-point
4834 * vectors, matrices, signed and unsigned integers and integer
4835 * vectors. Vertex shader inputs can also form arrays of these
4836 * types, but not structures."
4838 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4840 * "Vertex shader inputs can only be float, floating-point
4841 * vectors, matrices, signed and unsigned integers and integer
4842 * vectors. They cannot be arrays or structures."
4844 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4846 * "The attribute qualifier can be used only with float,
4847 * floating-point vectors, and matrices. Attribute variables
4848 * cannot be declared as arrays or structures."
4850 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4852 * "Vertex shader inputs can only be float, floating-point
4853 * vectors, matrices, signed and unsigned integers and integer
4854 * vectors. Vertex shader inputs cannot be arrays or
4857 const glsl_type
*check_type
= var
->type
->without_array();
4859 switch (check_type
->base_type
) {
4860 case GLSL_TYPE_FLOAT
:
4862 case GLSL_TYPE_UINT
:
4864 if (state
->is_version(120, 300))
4866 case GLSL_TYPE_DOUBLE
:
4867 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4871 _mesa_glsl_error(& loc
, state
,
4872 "vertex shader input / attribute cannot have "
4874 var
->type
->is_array() ? "array of " : "",
4876 error_emitted
= true;
4879 if (!error_emitted
&& var
->type
->is_array() &&
4880 !state
->check_version(150, 0, &loc
,
4881 "vertex shader input / attribute "
4882 "cannot have array type")) {
4883 error_emitted
= true;
4885 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4886 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4888 * Geometry shader input variables get the per-vertex values
4889 * written out by vertex shader output variables of the same
4890 * names. Since a geometry shader operates on a set of
4891 * vertices, each input varying variable (or input block, see
4892 * interface blocks below) needs to be declared as an array.
4894 if (!var
->type
->is_array()) {
4895 _mesa_glsl_error(&loc
, state
,
4896 "geometry shader inputs must be arrays");
4899 handle_geometry_shader_input_decl(state
, loc
, var
);
4900 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4901 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4903 * It is a compile-time error to declare a fragment shader
4904 * input with, or that contains, any of the following types:
4908 * * An array of arrays
4909 * * An array of structures
4910 * * A structure containing an array
4911 * * A structure containing a structure
4913 if (state
->es_shader
) {
4914 const glsl_type
*check_type
= var
->type
->without_array();
4915 if (check_type
->is_boolean() ||
4916 check_type
->contains_opaque()) {
4917 _mesa_glsl_error(&loc
, state
,
4918 "fragment shader input cannot have type %s",
4921 if (var
->type
->is_array() &&
4922 var
->type
->fields
.array
->is_array()) {
4923 _mesa_glsl_error(&loc
, state
,
4925 "cannot have an array of arrays",
4926 _mesa_shader_stage_to_string(state
->stage
));
4928 if (var
->type
->is_array() &&
4929 var
->type
->fields
.array
->is_record()) {
4930 _mesa_glsl_error(&loc
, state
,
4931 "fragment shader input "
4932 "cannot have an array of structs");
4934 if (var
->type
->is_record()) {
4935 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4936 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4937 var
->type
->fields
.structure
[i
].type
->is_record())
4938 _mesa_glsl_error(&loc
, state
,
4939 "fragement shader input cannot have "
4940 "a struct that contains an "
4945 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4946 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4947 handle_tess_shader_input_decl(state
, loc
, var
);
4949 } else if (var
->data
.mode
== ir_var_shader_out
) {
4950 const glsl_type
*check_type
= var
->type
->without_array();
4952 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4954 * It is a compile-time error to declare a vertex, tessellation
4955 * evaluation, tessellation control, or geometry shader output
4956 * that contains any of the following:
4958 * * A Boolean type (bool, bvec2 ...)
4961 if (check_type
->is_boolean() || check_type
->contains_opaque())
4962 _mesa_glsl_error(&loc
, state
,
4963 "%s shader output cannot have type %s",
4964 _mesa_shader_stage_to_string(state
->stage
),
4967 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4969 * It is a compile-time error to declare a fragment shader output
4970 * that contains any of the following:
4972 * * A Boolean type (bool, bvec2 ...)
4973 * * A double-precision scalar or vector (double, dvec2 ...)
4978 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4979 if (check_type
->is_record() || check_type
->is_matrix())
4980 _mesa_glsl_error(&loc
, state
,
4981 "fragment shader output "
4982 "cannot have struct or matrix type");
4983 switch (check_type
->base_type
) {
4984 case GLSL_TYPE_UINT
:
4986 case GLSL_TYPE_FLOAT
:
4989 _mesa_glsl_error(&loc
, state
,
4990 "fragment shader output cannot have "
4991 "type %s", check_type
->name
);
4995 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4997 * It is a compile-time error to declare a vertex shader output
4998 * with, or that contains, any of the following types:
5002 * * An array of arrays
5003 * * An array of structures
5004 * * A structure containing an array
5005 * * A structure containing a structure
5007 * It is a compile-time error to declare a fragment shader output
5008 * with, or that contains, any of the following types:
5014 * * An array of array
5016 if (state
->es_shader
) {
5017 if (var
->type
->is_array() &&
5018 var
->type
->fields
.array
->is_array()) {
5019 _mesa_glsl_error(&loc
, state
,
5021 "cannot have an array of arrays",
5022 _mesa_shader_stage_to_string(state
->stage
));
5024 if (state
->stage
== MESA_SHADER_VERTEX
) {
5025 if (var
->type
->is_array() &&
5026 var
->type
->fields
.array
->is_record()) {
5027 _mesa_glsl_error(&loc
, state
,
5028 "vertex shader output "
5029 "cannot have an array of structs");
5031 if (var
->type
->is_record()) {
5032 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5033 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5034 var
->type
->fields
.structure
[i
].type
->is_record())
5035 _mesa_glsl_error(&loc
, state
,
5036 "vertex shader output cannot have a "
5037 "struct that contains an "
5044 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5045 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5047 } else if (var
->type
->contains_subroutine()) {
5048 /* declare subroutine uniforms as hidden */
5049 var
->data
.how_declared
= ir_var_hidden
;
5052 /* From section 4.3.4 of the GLSL 4.00 spec:
5053 * "Input variables may not be declared using the patch in qualifier
5054 * in tessellation control or geometry shaders."
5056 * From section 4.3.6 of the GLSL 4.00 spec:
5057 * "It is an error to use patch out in a vertex, tessellation
5058 * evaluation, or geometry shader."
5060 * This doesn't explicitly forbid using them in a fragment shader, but
5061 * that's probably just an oversight.
5063 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5064 && this->type
->qualifier
.flags
.q
.patch
5065 && this->type
->qualifier
.flags
.q
.in
) {
5067 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5068 "tessellation evaluation shader");
5071 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5072 && this->type
->qualifier
.flags
.q
.patch
5073 && this->type
->qualifier
.flags
.q
.out
) {
5075 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5076 "tessellation control shader");
5079 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5081 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5082 state
->check_precision_qualifiers_allowed(&loc
);
5085 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5086 !precision_qualifier_allowed(var
->type
)) {
5087 _mesa_glsl_error(&loc
, state
,
5088 "precision qualifiers apply only to floating point"
5089 ", integer and opaque types");
5092 /* From section 4.1.7 of the GLSL 4.40 spec:
5094 * "[Opaque types] can only be declared as function
5095 * parameters or uniform-qualified variables."
5097 if (var_type
->contains_opaque() &&
5098 !this->type
->qualifier
.flags
.q
.uniform
) {
5099 _mesa_glsl_error(&loc
, state
,
5100 "opaque variables must be declared uniform");
5103 /* Process the initializer and add its instructions to a temporary
5104 * list. This list will be added to the instruction stream (below) after
5105 * the declaration is added. This is done because in some cases (such as
5106 * redeclarations) the declaration may not actually be added to the
5107 * instruction stream.
5109 exec_list initializer_instructions
;
5111 /* Examine var name here since var may get deleted in the next call */
5112 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5114 ir_variable
*earlier
=
5115 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5116 false /* allow_all_redeclarations */);
5117 if (earlier
!= NULL
) {
5119 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
5120 _mesa_glsl_error(&loc
, state
,
5121 "`%s' has already been redeclared using "
5122 "gl_PerVertex", earlier
->name
);
5124 earlier
->data
.how_declared
= ir_var_declared_normally
;
5127 if (decl
->initializer
!= NULL
) {
5128 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
5130 &initializer_instructions
, state
);
5132 validate_array_dimensions(var_type
, state
, &loc
);
5135 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5137 * "It is an error to write to a const variable outside of
5138 * its declaration, so they must be initialized when
5141 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5142 _mesa_glsl_error(& loc
, state
,
5143 "const declaration of `%s' must be initialized",
5147 if (state
->es_shader
) {
5148 const glsl_type
*const t
= (earlier
== NULL
)
5149 ? var
->type
: earlier
->type
;
5151 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5153 * The GL_OES_tessellation_shader spec says about inputs:
5155 * "Declaring an array size is optional. If no size is specified,
5156 * it will be taken from the implementation-dependent maximum
5157 * patch size (gl_MaxPatchVertices)."
5159 * and about TCS outputs:
5161 * "If no size is specified, it will be taken from output patch
5162 * size declared in the shader."
5164 * The GL_OES_geometry_shader spec says:
5166 * "All geometry shader input unsized array declarations will be
5167 * sized by an earlier input primitive layout qualifier, when
5168 * present, as per the following table."
5170 const bool implicitly_sized
=
5171 (var
->data
.mode
== ir_var_shader_in
&&
5172 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5173 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5174 (var
->data
.mode
== ir_var_shader_out
&&
5175 state
->stage
== MESA_SHADER_TESS_CTRL
);
5177 if (t
->is_unsized_array() && !implicitly_sized
)
5178 /* Section 10.17 of the GLSL ES 1.00 specification states that
5179 * unsized array declarations have been removed from the language.
5180 * Arrays that are sized using an initializer are still explicitly
5181 * sized. However, GLSL ES 1.00 does not allow array
5182 * initializers. That is only allowed in GLSL ES 3.00.
5184 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5186 * "An array type can also be formed without specifying a size
5187 * if the definition includes an initializer:
5189 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5190 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5195 _mesa_glsl_error(& loc
, state
,
5196 "unsized array declarations are not allowed in "
5200 /* If the declaration is not a redeclaration, there are a few additional
5201 * semantic checks that must be applied. In addition, variable that was
5202 * created for the declaration should be added to the IR stream.
5204 if (earlier
== NULL
) {
5205 validate_identifier(decl
->identifier
, loc
, state
);
5207 /* Add the variable to the symbol table. Note that the initializer's
5208 * IR was already processed earlier (though it hasn't been emitted
5209 * yet), without the variable in scope.
5211 * This differs from most C-like languages, but it follows the GLSL
5212 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5215 * "Within a declaration, the scope of a name starts immediately
5216 * after the initializer if present or immediately after the name
5217 * being declared if not."
5219 if (!state
->symbols
->add_variable(var
)) {
5220 YYLTYPE loc
= this->get_location();
5221 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5222 "current scope", decl
->identifier
);
5226 /* Push the variable declaration to the top. It means that all the
5227 * variable declarations will appear in a funny last-to-first order,
5228 * but otherwise we run into trouble if a function is prototyped, a
5229 * global var is decled, then the function is defined with usage of
5230 * the global var. See glslparsertest's CorrectModule.frag.
5232 instructions
->push_head(var
);
5235 instructions
->append_list(&initializer_instructions
);
5239 /* Generally, variable declarations do not have r-values. However,
5240 * one is used for the declaration in
5242 * while (bool b = some_condition()) {
5246 * so we return the rvalue from the last seen declaration here.
5253 ast_parameter_declarator::hir(exec_list
*instructions
,
5254 struct _mesa_glsl_parse_state
*state
)
5257 const struct glsl_type
*type
;
5258 const char *name
= NULL
;
5259 YYLTYPE loc
= this->get_location();
5261 type
= this->type
->glsl_type(& name
, state
);
5265 _mesa_glsl_error(& loc
, state
,
5266 "invalid type `%s' in declaration of `%s'",
5267 name
, this->identifier
);
5269 _mesa_glsl_error(& loc
, state
,
5270 "invalid type in declaration of `%s'",
5274 type
= glsl_type::error_type
;
5277 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5279 * "Functions that accept no input arguments need not use void in the
5280 * argument list because prototypes (or definitions) are required and
5281 * therefore there is no ambiguity when an empty argument list "( )" is
5282 * declared. The idiom "(void)" as a parameter list is provided for
5285 * Placing this check here prevents a void parameter being set up
5286 * for a function, which avoids tripping up checks for main taking
5287 * parameters and lookups of an unnamed symbol.
5289 if (type
->is_void()) {
5290 if (this->identifier
!= NULL
)
5291 _mesa_glsl_error(& loc
, state
,
5292 "named parameter cannot have type `void'");
5298 if (formal_parameter
&& (this->identifier
== NULL
)) {
5299 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5303 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5304 * call already handled the "vec4[..] foo" case.
5306 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5308 if (!type
->is_error() && type
->is_unsized_array()) {
5309 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5311 type
= glsl_type::error_type
;
5315 ir_variable
*var
= new(ctx
)
5316 ir_variable(type
, this->identifier
, ir_var_function_in
);
5318 /* Apply any specified qualifiers to the parameter declaration. Note that
5319 * for function parameters the default mode is 'in'.
5321 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5324 /* From section 4.1.7 of the GLSL 4.40 spec:
5326 * "Opaque variables cannot be treated as l-values; hence cannot
5327 * be used as out or inout function parameters, nor can they be
5330 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5331 && type
->contains_opaque()) {
5332 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5333 "contain opaque variables");
5334 type
= glsl_type::error_type
;
5337 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5339 * "When calling a function, expressions that do not evaluate to
5340 * l-values cannot be passed to parameters declared as out or inout."
5342 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5344 * "Other binary or unary expressions, non-dereferenced arrays,
5345 * function names, swizzles with repeated fields, and constants
5346 * cannot be l-values."
5348 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5349 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5351 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5353 && !state
->check_version(120, 100, &loc
,
5354 "arrays cannot be out or inout parameters")) {
5355 type
= glsl_type::error_type
;
5358 instructions
->push_tail(var
);
5360 /* Parameter declarations do not have r-values.
5367 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5369 exec_list
*ir_parameters
,
5370 _mesa_glsl_parse_state
*state
)
5372 ast_parameter_declarator
*void_param
= NULL
;
5375 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5376 param
->formal_parameter
= formal
;
5377 param
->hir(ir_parameters
, state
);
5385 if ((void_param
!= NULL
) && (count
> 1)) {
5386 YYLTYPE loc
= void_param
->get_location();
5388 _mesa_glsl_error(& loc
, state
,
5389 "`void' parameter must be only parameter");
5395 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5397 /* IR invariants disallow function declarations or definitions
5398 * nested within other function definitions. But there is no
5399 * requirement about the relative order of function declarations
5400 * and definitions with respect to one another. So simply insert
5401 * the new ir_function block at the end of the toplevel instruction
5404 state
->toplevel_ir
->push_tail(f
);
5409 ast_function::hir(exec_list
*instructions
,
5410 struct _mesa_glsl_parse_state
*state
)
5413 ir_function
*f
= NULL
;
5414 ir_function_signature
*sig
= NULL
;
5415 exec_list hir_parameters
;
5416 YYLTYPE loc
= this->get_location();
5418 const char *const name
= identifier
;
5420 /* New functions are always added to the top-level IR instruction stream,
5421 * so this instruction list pointer is ignored. See also emit_function
5424 (void) instructions
;
5426 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5428 * "Function declarations (prototypes) cannot occur inside of functions;
5429 * they must be at global scope, or for the built-in functions, outside
5430 * the global scope."
5432 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5434 * "User defined functions may only be defined within the global scope."
5436 * Note that this language does not appear in GLSL 1.10.
5438 if ((state
->current_function
!= NULL
) &&
5439 state
->is_version(120, 100)) {
5440 YYLTYPE loc
= this->get_location();
5441 _mesa_glsl_error(&loc
, state
,
5442 "declaration of function `%s' not allowed within "
5443 "function body", name
);
5446 validate_identifier(name
, this->get_location(), state
);
5448 /* Convert the list of function parameters to HIR now so that they can be
5449 * used below to compare this function's signature with previously seen
5450 * signatures for functions with the same name.
5452 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5454 & hir_parameters
, state
);
5456 const char *return_type_name
;
5457 const glsl_type
*return_type
=
5458 this->return_type
->glsl_type(& return_type_name
, state
);
5461 YYLTYPE loc
= this->get_location();
5462 _mesa_glsl_error(&loc
, state
,
5463 "function `%s' has undeclared return type `%s'",
5464 name
, return_type_name
);
5465 return_type
= glsl_type::error_type
;
5468 /* ARB_shader_subroutine states:
5469 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5470 * subroutine(...) to a function declaration."
5472 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5473 YYLTYPE loc
= this->get_location();
5474 _mesa_glsl_error(&loc
, state
,
5475 "function declaration `%s' cannot have subroutine prepended",
5479 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5480 * "No qualifier is allowed on the return type of a function."
5482 if (this->return_type
->has_qualifiers(state
)) {
5483 YYLTYPE loc
= this->get_location();
5484 _mesa_glsl_error(& loc
, state
,
5485 "function `%s' return type has qualifiers", name
);
5488 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5490 * "Arrays are allowed as arguments and as the return type. In both
5491 * cases, the array must be explicitly sized."
5493 if (return_type
->is_unsized_array()) {
5494 YYLTYPE loc
= this->get_location();
5495 _mesa_glsl_error(& loc
, state
,
5496 "function `%s' return type array must be explicitly "
5500 /* From section 4.1.7 of the GLSL 4.40 spec:
5502 * "[Opaque types] can only be declared as function parameters
5503 * or uniform-qualified variables."
5505 if (return_type
->contains_opaque()) {
5506 YYLTYPE loc
= this->get_location();
5507 _mesa_glsl_error(&loc
, state
,
5508 "function `%s' return type can't contain an opaque type",
5513 if (return_type
->is_subroutine()) {
5514 YYLTYPE loc
= this->get_location();
5515 _mesa_glsl_error(&loc
, state
,
5516 "function `%s' return type can't be a subroutine type",
5521 /* Create an ir_function if one doesn't already exist. */
5522 f
= state
->symbols
->get_function(name
);
5524 f
= new(ctx
) ir_function(name
);
5525 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5526 if (!state
->symbols
->add_function(f
)) {
5527 /* This function name shadows a non-function use of the same name. */
5528 YYLTYPE loc
= this->get_location();
5529 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5530 "non-function", name
);
5534 emit_function(state
, f
);
5537 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5539 * "A shader cannot redefine or overload built-in functions."
5541 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5543 * "User code can overload the built-in functions but cannot redefine
5546 if (state
->es_shader
&& state
->language_version
>= 300) {
5547 /* Local shader has no exact candidates; check the built-ins. */
5548 _mesa_glsl_initialize_builtin_functions();
5549 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5550 YYLTYPE loc
= this->get_location();
5551 _mesa_glsl_error(& loc
, state
,
5552 "A shader cannot redefine or overload built-in "
5553 "function `%s' in GLSL ES 3.00", name
);
5558 /* Verify that this function's signature either doesn't match a previously
5559 * seen signature for a function with the same name, or, if a match is found,
5560 * that the previously seen signature does not have an associated definition.
5562 if (state
->es_shader
|| f
->has_user_signature()) {
5563 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5565 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5566 if (badvar
!= NULL
) {
5567 YYLTYPE loc
= this->get_location();
5569 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5570 "qualifiers don't match prototype", name
, badvar
);
5573 if (sig
->return_type
!= return_type
) {
5574 YYLTYPE loc
= this->get_location();
5576 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5577 "match prototype", name
);
5580 if (sig
->is_defined
) {
5581 if (is_definition
) {
5582 YYLTYPE loc
= this->get_location();
5583 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5585 /* We just encountered a prototype that exactly matches a
5586 * function that's already been defined. This is redundant,
5587 * and we should ignore it.
5595 /* Verify the return type of main() */
5596 if (strcmp(name
, "main") == 0) {
5597 if (! return_type
->is_void()) {
5598 YYLTYPE loc
= this->get_location();
5600 _mesa_glsl_error(& loc
, state
, "main() must return void");
5603 if (!hir_parameters
.is_empty()) {
5604 YYLTYPE loc
= this->get_location();
5606 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5610 /* Finish storing the information about this new function in its signature.
5613 sig
= new(ctx
) ir_function_signature(return_type
);
5614 f
->add_signature(sig
);
5617 sig
->replace_parameters(&hir_parameters
);
5620 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5623 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5624 unsigned qual_index
;
5625 if (process_qualifier_constant(state
, &loc
, "index",
5626 this->return_type
->qualifier
.index
,
5628 if (!state
->has_explicit_uniform_location()) {
5629 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5630 "GL_ARB_explicit_uniform_location or "
5632 } else if (qual_index
>= MAX_SUBROUTINES
) {
5633 _mesa_glsl_error(&loc
, state
,
5634 "invalid subroutine index (%d) index must "
5635 "be a number between 0 and "
5636 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5637 MAX_SUBROUTINES
- 1);
5639 f
->subroutine_index
= qual_index
;
5644 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5645 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5646 f
->num_subroutine_types
);
5648 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5649 const struct glsl_type
*type
;
5650 /* the subroutine type must be already declared */
5651 type
= state
->symbols
->get_type(decl
->identifier
);
5653 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5656 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5657 ir_function
*fn
= state
->subroutine_types
[i
];
5658 ir_function_signature
*tsig
= NULL
;
5660 if (strcmp(fn
->name
, decl
->identifier
))
5663 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5666 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5668 if (tsig
->return_type
!= sig
->return_type
) {
5669 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5673 f
->subroutine_types
[idx
++] = type
;
5675 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5677 state
->num_subroutines
+ 1);
5678 state
->subroutines
[state
->num_subroutines
] = f
;
5679 state
->num_subroutines
++;
5683 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5684 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5685 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5688 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5690 state
->num_subroutine_types
+ 1);
5691 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5692 state
->num_subroutine_types
++;
5694 f
->is_subroutine
= true;
5697 /* Function declarations (prototypes) do not have r-values.
5704 ast_function_definition::hir(exec_list
*instructions
,
5705 struct _mesa_glsl_parse_state
*state
)
5707 prototype
->is_definition
= true;
5708 prototype
->hir(instructions
, state
);
5710 ir_function_signature
*signature
= prototype
->signature
;
5711 if (signature
== NULL
)
5714 assert(state
->current_function
== NULL
);
5715 state
->current_function
= signature
;
5716 state
->found_return
= false;
5718 /* Duplicate parameters declared in the prototype as concrete variables.
5719 * Add these to the symbol table.
5721 state
->symbols
->push_scope();
5722 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5723 assert(var
->as_variable() != NULL
);
5725 /* The only way a parameter would "exist" is if two parameters have
5728 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5729 YYLTYPE loc
= this->get_location();
5731 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5733 state
->symbols
->add_variable(var
);
5737 /* Convert the body of the function to HIR. */
5738 this->body
->hir(&signature
->body
, state
);
5739 signature
->is_defined
= true;
5741 state
->symbols
->pop_scope();
5743 assert(state
->current_function
== signature
);
5744 state
->current_function
= NULL
;
5746 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5747 YYLTYPE loc
= this->get_location();
5748 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5749 "%s, but no return statement",
5750 signature
->function_name(),
5751 signature
->return_type
->name
);
5754 /* Function definitions do not have r-values.
5761 ast_jump_statement::hir(exec_list
*instructions
,
5762 struct _mesa_glsl_parse_state
*state
)
5769 assert(state
->current_function
);
5771 if (opt_return_value
) {
5772 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5774 /* The value of the return type can be NULL if the shader says
5775 * 'return foo();' and foo() is a function that returns void.
5777 * NOTE: The GLSL spec doesn't say that this is an error. The type
5778 * of the return value is void. If the return type of the function is
5779 * also void, then this should compile without error. Seriously.
5781 const glsl_type
*const ret_type
=
5782 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5784 /* Implicit conversions are not allowed for return values prior to
5785 * ARB_shading_language_420pack.
5787 if (state
->current_function
->return_type
!= ret_type
) {
5788 YYLTYPE loc
= this->get_location();
5790 if (state
->has_420pack()) {
5791 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5793 _mesa_glsl_error(& loc
, state
,
5794 "could not implicitly convert return value "
5795 "to %s, in function `%s'",
5796 state
->current_function
->return_type
->name
,
5797 state
->current_function
->function_name());
5800 _mesa_glsl_error(& loc
, state
,
5801 "`return' with wrong type %s, in function `%s' "
5804 state
->current_function
->function_name(),
5805 state
->current_function
->return_type
->name
);
5807 } else if (state
->current_function
->return_type
->base_type
==
5809 YYLTYPE loc
= this->get_location();
5811 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5812 * specs add a clarification:
5814 * "A void function can only use return without a return argument, even if
5815 * the return argument has void type. Return statements only accept values:
5818 * void func2() { return func1(); } // illegal return statement"
5820 _mesa_glsl_error(& loc
, state
,
5821 "void functions can only use `return' without a "
5825 inst
= new(ctx
) ir_return(ret
);
5827 if (state
->current_function
->return_type
->base_type
!=
5829 YYLTYPE loc
= this->get_location();
5831 _mesa_glsl_error(& loc
, state
,
5832 "`return' with no value, in function %s returning "
5834 state
->current_function
->function_name());
5836 inst
= new(ctx
) ir_return
;
5839 state
->found_return
= true;
5840 instructions
->push_tail(inst
);
5845 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5846 YYLTYPE loc
= this->get_location();
5848 _mesa_glsl_error(& loc
, state
,
5849 "`discard' may only appear in a fragment shader");
5851 instructions
->push_tail(new(ctx
) ir_discard
);
5856 if (mode
== ast_continue
&&
5857 state
->loop_nesting_ast
== NULL
) {
5858 YYLTYPE loc
= this->get_location();
5860 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5861 } else if (mode
== ast_break
&&
5862 state
->loop_nesting_ast
== NULL
&&
5863 state
->switch_state
.switch_nesting_ast
== NULL
) {
5864 YYLTYPE loc
= this->get_location();
5866 _mesa_glsl_error(& loc
, state
,
5867 "break may only appear in a loop or a switch");
5869 /* For a loop, inline the for loop expression again, since we don't
5870 * know where near the end of the loop body the normal copy of it is
5871 * going to be placed. Same goes for the condition for a do-while
5874 if (state
->loop_nesting_ast
!= NULL
&&
5875 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5876 if (state
->loop_nesting_ast
->rest_expression
) {
5877 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5880 if (state
->loop_nesting_ast
->mode
==
5881 ast_iteration_statement::ast_do_while
) {
5882 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5886 if (state
->switch_state
.is_switch_innermost
&&
5887 mode
== ast_continue
) {
5888 /* Set 'continue_inside' to true. */
5889 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5890 ir_dereference_variable
*deref_continue_inside_var
=
5891 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5892 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5895 /* Break out from the switch, continue for the loop will
5896 * be called right after switch. */
5897 ir_loop_jump
*const jump
=
5898 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5899 instructions
->push_tail(jump
);
5901 } else if (state
->switch_state
.is_switch_innermost
&&
5902 mode
== ast_break
) {
5903 /* Force break out of switch by inserting a break. */
5904 ir_loop_jump
*const jump
=
5905 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5906 instructions
->push_tail(jump
);
5908 ir_loop_jump
*const jump
=
5909 new(ctx
) ir_loop_jump((mode
== ast_break
)
5910 ? ir_loop_jump::jump_break
5911 : ir_loop_jump::jump_continue
);
5912 instructions
->push_tail(jump
);
5919 /* Jump instructions do not have r-values.
5926 ast_selection_statement::hir(exec_list
*instructions
,
5927 struct _mesa_glsl_parse_state
*state
)
5931 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5933 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5935 * "Any expression whose type evaluates to a Boolean can be used as the
5936 * conditional expression bool-expression. Vector types are not accepted
5937 * as the expression to if."
5939 * The checks are separated so that higher quality diagnostics can be
5940 * generated for cases where both rules are violated.
5942 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5943 YYLTYPE loc
= this->condition
->get_location();
5945 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5949 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5951 if (then_statement
!= NULL
) {
5952 state
->symbols
->push_scope();
5953 then_statement
->hir(& stmt
->then_instructions
, state
);
5954 state
->symbols
->pop_scope();
5957 if (else_statement
!= NULL
) {
5958 state
->symbols
->push_scope();
5959 else_statement
->hir(& stmt
->else_instructions
, state
);
5960 state
->symbols
->pop_scope();
5963 instructions
->push_tail(stmt
);
5965 /* if-statements do not have r-values.
5971 /* Used for detection of duplicate case values, compare
5972 * given contents directly.
5975 compare_case_value(const void *a
, const void *b
)
5977 return *(unsigned *) a
== *(unsigned *) b
;
5981 /* Used for detection of duplicate case values, just
5982 * returns key contents as is.
5985 key_contents(const void *key
)
5987 return *(unsigned *) key
;
5992 ast_switch_statement::hir(exec_list
*instructions
,
5993 struct _mesa_glsl_parse_state
*state
)
5997 ir_rvalue
*const test_expression
=
5998 this->test_expression
->hir(instructions
, state
);
6000 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6002 * "The type of init-expression in a switch statement must be a
6005 if (!test_expression
->type
->is_scalar() ||
6006 !test_expression
->type
->is_integer()) {
6007 YYLTYPE loc
= this->test_expression
->get_location();
6009 _mesa_glsl_error(& loc
,
6011 "switch-statement expression must be scalar "
6015 /* Track the switch-statement nesting in a stack-like manner.
6017 struct glsl_switch_state saved
= state
->switch_state
;
6019 state
->switch_state
.is_switch_innermost
= true;
6020 state
->switch_state
.switch_nesting_ast
= this;
6021 state
->switch_state
.labels_ht
=
6022 _mesa_hash_table_create(NULL
, key_contents
,
6023 compare_case_value
);
6024 state
->switch_state
.previous_default
= NULL
;
6026 /* Initalize is_fallthru state to false.
6028 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6029 state
->switch_state
.is_fallthru_var
=
6030 new(ctx
) ir_variable(glsl_type::bool_type
,
6031 "switch_is_fallthru_tmp",
6033 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6035 ir_dereference_variable
*deref_is_fallthru_var
=
6036 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6037 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6040 /* Initialize continue_inside state to false.
6042 state
->switch_state
.continue_inside
=
6043 new(ctx
) ir_variable(glsl_type::bool_type
,
6044 "continue_inside_tmp",
6046 instructions
->push_tail(state
->switch_state
.continue_inside
);
6048 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6049 ir_dereference_variable
*deref_continue_inside_var
=
6050 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6051 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6054 state
->switch_state
.run_default
=
6055 new(ctx
) ir_variable(glsl_type::bool_type
,
6058 instructions
->push_tail(state
->switch_state
.run_default
);
6060 /* Loop around the switch is used for flow control. */
6061 ir_loop
* loop
= new(ctx
) ir_loop();
6062 instructions
->push_tail(loop
);
6064 /* Cache test expression.
6066 test_to_hir(&loop
->body_instructions
, state
);
6068 /* Emit code for body of switch stmt.
6070 body
->hir(&loop
->body_instructions
, state
);
6072 /* Insert a break at the end to exit loop. */
6073 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6074 loop
->body_instructions
.push_tail(jump
);
6076 /* If we are inside loop, check if continue got called inside switch. */
6077 if (state
->loop_nesting_ast
!= NULL
) {
6078 ir_dereference_variable
*deref_continue_inside
=
6079 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6080 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6081 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6083 if (state
->loop_nesting_ast
!= NULL
) {
6084 if (state
->loop_nesting_ast
->rest_expression
) {
6085 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6088 if (state
->loop_nesting_ast
->mode
==
6089 ast_iteration_statement::ast_do_while
) {
6090 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6093 irif
->then_instructions
.push_tail(jump
);
6094 instructions
->push_tail(irif
);
6097 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6099 state
->switch_state
= saved
;
6101 /* Switch statements do not have r-values. */
6107 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6108 struct _mesa_glsl_parse_state
*state
)
6112 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6113 * on the switch test case. The first one would be already raised when
6114 * getting the test_expression at ast_switch_statement::hir
6116 test_expression
->set_is_lhs(true);
6117 /* Cache value of test expression. */
6118 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6120 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6123 ir_dereference_variable
*deref_test_var
=
6124 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6126 instructions
->push_tail(state
->switch_state
.test_var
);
6127 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6132 ast_switch_body::hir(exec_list
*instructions
,
6133 struct _mesa_glsl_parse_state
*state
)
6136 stmts
->hir(instructions
, state
);
6138 /* Switch bodies do not have r-values. */
6143 ast_case_statement_list::hir(exec_list
*instructions
,
6144 struct _mesa_glsl_parse_state
*state
)
6146 exec_list default_case
, after_default
, tmp
;
6148 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6149 case_stmt
->hir(&tmp
, state
);
6152 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6153 default_case
.append_list(&tmp
);
6157 /* If default case found, append 'after_default' list. */
6158 if (!default_case
.is_empty())
6159 after_default
.append_list(&tmp
);
6161 instructions
->append_list(&tmp
);
6164 /* Handle the default case. This is done here because default might not be
6165 * the last case. We need to add checks against following cases first to see
6166 * if default should be chosen or not.
6168 if (!default_case
.is_empty()) {
6170 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6171 ir_dereference_variable
*deref_run_default_var
=
6172 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6174 /* Choose to run default case initially, following conditional
6175 * assignments might change this.
6177 ir_assignment
*const init_var
=
6178 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6179 instructions
->push_tail(init_var
);
6181 /* Default case was the last one, no checks required. */
6182 if (after_default
.is_empty()) {
6183 instructions
->append_list(&default_case
);
6187 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6188 ir_assignment
*assign
= ir
->as_assignment();
6193 /* Clone the check between case label and init expression. */
6194 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6195 ir_expression
*clone
= exp
->clone(state
, NULL
);
6197 ir_dereference_variable
*deref_var
=
6198 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6199 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6201 ir_assignment
*const set_false
=
6202 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6204 instructions
->push_tail(set_false
);
6207 /* Append default case and all cases after it. */
6208 instructions
->append_list(&default_case
);
6209 instructions
->append_list(&after_default
);
6212 /* Case statements do not have r-values. */
6217 ast_case_statement::hir(exec_list
*instructions
,
6218 struct _mesa_glsl_parse_state
*state
)
6220 labels
->hir(instructions
, state
);
6222 /* Guard case statements depending on fallthru state. */
6223 ir_dereference_variable
*const deref_fallthru_guard
=
6224 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6225 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6227 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6228 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6230 instructions
->push_tail(test_fallthru
);
6232 /* Case statements do not have r-values. */
6238 ast_case_label_list::hir(exec_list
*instructions
,
6239 struct _mesa_glsl_parse_state
*state
)
6241 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6242 label
->hir(instructions
, state
);
6244 /* Case labels do not have r-values. */
6249 ast_case_label::hir(exec_list
*instructions
,
6250 struct _mesa_glsl_parse_state
*state
)
6254 ir_dereference_variable
*deref_fallthru_var
=
6255 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6257 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6259 /* If not default case, ... */
6260 if (this->test_value
!= NULL
) {
6261 /* Conditionally set fallthru state based on
6262 * comparison of cached test expression value to case label.
6264 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6265 ir_constant
*label_const
= label_rval
->constant_expression_value();
6268 YYLTYPE loc
= this->test_value
->get_location();
6270 _mesa_glsl_error(& loc
, state
,
6271 "switch statement case label must be a "
6272 "constant expression");
6274 /* Stuff a dummy value in to allow processing to continue. */
6275 label_const
= new(ctx
) ir_constant(0);
6278 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6279 (void *)(uintptr_t)&label_const
->value
.u
[0]);
6282 ast_expression
*previous_label
= (ast_expression
*) entry
->data
;
6283 YYLTYPE loc
= this->test_value
->get_location();
6284 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6286 loc
= previous_label
->get_location();
6287 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6289 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6290 (void *)(uintptr_t)&label_const
->value
.u
[0],
6295 ir_dereference_variable
*deref_test_var
=
6296 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6298 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6303 * From GLSL 4.40 specification section 6.2 ("Selection"):
6305 * "The type of the init-expression value in a switch statement must
6306 * be a scalar int or uint. The type of the constant-expression value
6307 * in a case label also must be a scalar int or uint. When any pair
6308 * of these values is tested for "equal value" and the types do not
6309 * match, an implicit conversion will be done to convert the int to a
6310 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6313 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6314 YYLTYPE loc
= this->test_value
->get_location();
6316 const glsl_type
*type_a
= label_const
->type
;
6317 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6319 /* Check if int->uint implicit conversion is supported. */
6320 bool integer_conversion_supported
=
6321 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6324 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6325 !integer_conversion_supported
) {
6326 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6327 "init-expression and case label (%s != %s)",
6328 type_a
->name
, type_b
->name
);
6330 /* Conversion of the case label. */
6331 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6332 if (!apply_implicit_conversion(glsl_type::uint_type
,
6333 test_cond
->operands
[0], state
))
6334 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6336 /* Conversion of the init-expression value. */
6337 if (!apply_implicit_conversion(glsl_type::uint_type
,
6338 test_cond
->operands
[1], state
))
6339 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6344 ir_assignment
*set_fallthru_on_test
=
6345 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6347 instructions
->push_tail(set_fallthru_on_test
);
6348 } else { /* default case */
6349 if (state
->switch_state
.previous_default
) {
6350 YYLTYPE loc
= this->get_location();
6351 _mesa_glsl_error(& loc
, state
,
6352 "multiple default labels in one switch");
6354 loc
= state
->switch_state
.previous_default
->get_location();
6355 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6357 state
->switch_state
.previous_default
= this;
6359 /* Set fallthru condition on 'run_default' bool. */
6360 ir_dereference_variable
*deref_run_default
=
6361 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6362 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6363 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6367 /* Set falltrhu state. */
6368 ir_assignment
*set_fallthru
=
6369 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6371 instructions
->push_tail(set_fallthru
);
6374 /* Case statements do not have r-values. */
6379 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6380 struct _mesa_glsl_parse_state
*state
)
6384 if (condition
!= NULL
) {
6385 ir_rvalue
*const cond
=
6386 condition
->hir(instructions
, state
);
6389 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6390 YYLTYPE loc
= condition
->get_location();
6392 _mesa_glsl_error(& loc
, state
,
6393 "loop condition must be scalar boolean");
6395 /* As the first code in the loop body, generate a block that looks
6396 * like 'if (!condition) break;' as the loop termination condition.
6398 ir_rvalue
*const not_cond
=
6399 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6401 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6403 ir_jump
*const break_stmt
=
6404 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6406 if_stmt
->then_instructions
.push_tail(break_stmt
);
6407 instructions
->push_tail(if_stmt
);
6414 ast_iteration_statement::hir(exec_list
*instructions
,
6415 struct _mesa_glsl_parse_state
*state
)
6419 /* For-loops and while-loops start a new scope, but do-while loops do not.
6421 if (mode
!= ast_do_while
)
6422 state
->symbols
->push_scope();
6424 if (init_statement
!= NULL
)
6425 init_statement
->hir(instructions
, state
);
6427 ir_loop
*const stmt
= new(ctx
) ir_loop();
6428 instructions
->push_tail(stmt
);
6430 /* Track the current loop nesting. */
6431 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6433 state
->loop_nesting_ast
= this;
6435 /* Likewise, indicate that following code is closest to a loop,
6436 * NOT closest to a switch.
6438 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6439 state
->switch_state
.is_switch_innermost
= false;
6441 if (mode
!= ast_do_while
)
6442 condition_to_hir(&stmt
->body_instructions
, state
);
6445 body
->hir(& stmt
->body_instructions
, state
);
6447 if (rest_expression
!= NULL
)
6448 rest_expression
->hir(& stmt
->body_instructions
, state
);
6450 if (mode
== ast_do_while
)
6451 condition_to_hir(&stmt
->body_instructions
, state
);
6453 if (mode
!= ast_do_while
)
6454 state
->symbols
->pop_scope();
6456 /* Restore previous nesting before returning. */
6457 state
->loop_nesting_ast
= nesting_ast
;
6458 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6460 /* Loops do not have r-values.
6467 * Determine if the given type is valid for establishing a default precision
6470 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6472 * "The precision statement
6474 * precision precision-qualifier type;
6476 * can be used to establish a default precision qualifier. The type field
6477 * can be either int or float or any of the sampler types, and the
6478 * precision-qualifier can be lowp, mediump, or highp."
6480 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6481 * qualifiers on sampler types, but this seems like an oversight (since the
6482 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6483 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6487 is_valid_default_precision_type(const struct glsl_type
*const type
)
6492 switch (type
->base_type
) {
6494 case GLSL_TYPE_FLOAT
:
6495 /* "int" and "float" are valid, but vectors and matrices are not. */
6496 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6497 case GLSL_TYPE_SAMPLER
:
6498 case GLSL_TYPE_IMAGE
:
6499 case GLSL_TYPE_ATOMIC_UINT
:
6508 ast_type_specifier::hir(exec_list
*instructions
,
6509 struct _mesa_glsl_parse_state
*state
)
6511 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6514 YYLTYPE loc
= this->get_location();
6516 /* If this is a precision statement, check that the type to which it is
6517 * applied is either float or int.
6519 * From section 4.5.3 of the GLSL 1.30 spec:
6520 * "The precision statement
6521 * precision precision-qualifier type;
6522 * can be used to establish a default precision qualifier. The type
6523 * field can be either int or float [...]. Any other types or
6524 * qualifiers will result in an error.
6526 if (this->default_precision
!= ast_precision_none
) {
6527 if (!state
->check_precision_qualifiers_allowed(&loc
))
6530 if (this->structure
!= NULL
) {
6531 _mesa_glsl_error(&loc
, state
,
6532 "precision qualifiers do not apply to structures");
6536 if (this->array_specifier
!= NULL
) {
6537 _mesa_glsl_error(&loc
, state
,
6538 "default precision statements do not apply to "
6543 const struct glsl_type
*const type
=
6544 state
->symbols
->get_type(this->type_name
);
6545 if (!is_valid_default_precision_type(type
)) {
6546 _mesa_glsl_error(&loc
, state
,
6547 "default precision statements apply only to "
6548 "float, int, and opaque types");
6552 if (state
->es_shader
) {
6553 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6556 * "Non-precision qualified declarations will use the precision
6557 * qualifier specified in the most recent precision statement
6558 * that is still in scope. The precision statement has the same
6559 * scoping rules as variable declarations. If it is declared
6560 * inside a compound statement, its effect stops at the end of
6561 * the innermost statement it was declared in. Precision
6562 * statements in nested scopes override precision statements in
6563 * outer scopes. Multiple precision statements for the same basic
6564 * type can appear inside the same scope, with later statements
6565 * overriding earlier statements within that scope."
6567 * Default precision specifications follow the same scope rules as
6568 * variables. So, we can track the state of the default precision
6569 * qualifiers in the symbol table, and the rules will just work. This
6570 * is a slight abuse of the symbol table, but it has the semantics
6573 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6574 this->default_precision
);
6577 /* FINISHME: Translate precision statements into IR. */
6581 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6582 * process_record_constructor() can do type-checking on C-style initializer
6583 * expressions of structs, but ast_struct_specifier should only be translated
6584 * to HIR if it is declaring the type of a structure.
6586 * The ->is_declaration field is false for initializers of variables
6587 * declared separately from the struct's type definition.
6589 * struct S { ... }; (is_declaration = true)
6590 * struct T { ... } t = { ... }; (is_declaration = true)
6591 * S s = { ... }; (is_declaration = false)
6593 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6594 return this->structure
->hir(instructions
, state
);
6601 * Process a structure or interface block tree into an array of structure fields
6603 * After parsing, where there are some syntax differnces, structures and
6604 * interface blocks are almost identical. They are similar enough that the
6605 * AST for each can be processed the same way into a set of
6606 * \c glsl_struct_field to describe the members.
6608 * If we're processing an interface block, var_mode should be the type of the
6609 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6610 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6614 * The number of fields processed. A pointer to the array structure fields is
6615 * stored in \c *fields_ret.
6618 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6619 struct _mesa_glsl_parse_state
*state
,
6620 exec_list
*declarations
,
6621 glsl_struct_field
**fields_ret
,
6623 enum glsl_matrix_layout matrix_layout
,
6624 bool allow_reserved_names
,
6625 ir_variable_mode var_mode
,
6626 ast_type_qualifier
*layout
,
6627 unsigned block_stream
,
6628 unsigned block_xfb_buffer
,
6629 unsigned block_xfb_offset
,
6630 unsigned expl_location
,
6631 unsigned expl_align
)
6633 unsigned decl_count
= 0;
6634 unsigned next_offset
= 0;
6636 /* Make an initial pass over the list of fields to determine how
6637 * many there are. Each element in this list is an ast_declarator_list.
6638 * This means that we actually need to count the number of elements in the
6639 * 'declarations' list in each of the elements.
6641 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6642 decl_count
+= decl_list
->declarations
.length();
6645 /* Allocate storage for the fields and process the field
6646 * declarations. As the declarations are processed, try to also convert
6647 * the types to HIR. This ensures that structure definitions embedded in
6648 * other structure definitions or in interface blocks are processed.
6650 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
6653 bool first_member
= true;
6654 bool first_member_has_explicit_location
= false;
6657 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6658 const char *type_name
;
6659 YYLTYPE loc
= decl_list
->get_location();
6661 decl_list
->type
->specifier
->hir(instructions
, state
);
6663 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6665 * "Anonymous structures are not supported; so embedded structures
6666 * must have a declarator. A name given to an embedded struct is
6667 * scoped at the same level as the struct it is embedded in."
6669 * The same section of the GLSL 1.20 spec says:
6671 * "Anonymous structures are not supported. Embedded structures are
6674 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6675 * embedded structures in 1.10 only.
6677 if (state
->language_version
!= 110 &&
6678 decl_list
->type
->specifier
->structure
!= NULL
)
6679 _mesa_glsl_error(&loc
, state
,
6680 "embedded structure declarations are not allowed");
6682 const glsl_type
*decl_type
=
6683 decl_list
->type
->glsl_type(& type_name
, state
);
6685 const struct ast_type_qualifier
*const qual
=
6686 &decl_list
->type
->qualifier
;
6688 /* From section 4.3.9 of the GLSL 4.40 spec:
6690 * "[In interface blocks] opaque types are not allowed."
6692 * It should be impossible for decl_type to be NULL here. Cases that
6693 * might naturally lead to decl_type being NULL, especially for the
6694 * is_interface case, will have resulted in compilation having
6695 * already halted due to a syntax error.
6700 if (decl_type
->contains_opaque()) {
6701 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6702 "interface block contains opaque variable");
6705 if (decl_type
->contains_atomic()) {
6706 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6708 * "Members of structures cannot be declared as atomic counter
6711 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6714 if (decl_type
->contains_image()) {
6715 /* FINISHME: Same problem as with atomic counters.
6716 * FINISHME: Request clarification from Khronos and add
6717 * FINISHME: spec quotation here.
6719 _mesa_glsl_error(&loc
, state
, "image in structure");
6723 if (qual
->flags
.q
.explicit_binding
) {
6724 _mesa_glsl_error(&loc
, state
,
6725 "binding layout qualifier cannot be applied "
6726 "to struct or interface block members");
6730 if (!first_member
) {
6731 if (!layout
->flags
.q
.explicit_location
&&
6732 ((first_member_has_explicit_location
&&
6733 !qual
->flags
.q
.explicit_location
) ||
6734 (!first_member_has_explicit_location
&&
6735 qual
->flags
.q
.explicit_location
))) {
6736 _mesa_glsl_error(&loc
, state
,
6737 "when block-level location layout qualifier "
6738 "is not supplied either all members must "
6739 "have a location layout qualifier or all "
6740 "members must not have a location layout "
6744 first_member
= false;
6745 first_member_has_explicit_location
=
6746 qual
->flags
.q
.explicit_location
;
6750 if (qual
->flags
.q
.std140
||
6751 qual
->flags
.q
.std430
||
6752 qual
->flags
.q
.packed
||
6753 qual
->flags
.q
.shared
) {
6754 _mesa_glsl_error(&loc
, state
,
6755 "uniform/shader storage block layout qualifiers "
6756 "std140, std430, packed, and shared can only be "
6757 "applied to uniform/shader storage blocks, not "
6761 if (qual
->flags
.q
.constant
) {
6762 _mesa_glsl_error(&loc
, state
,
6763 "const storage qualifier cannot be applied "
6764 "to struct or interface block members");
6767 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6769 * "A block member may be declared with a stream identifier, but
6770 * the specified stream must match the stream associated with the
6771 * containing block."
6773 if (qual
->flags
.q
.explicit_stream
) {
6774 unsigned qual_stream
;
6775 if (process_qualifier_constant(state
, &loc
, "stream",
6776 qual
->stream
, &qual_stream
) &&
6777 qual_stream
!= block_stream
) {
6778 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6779 "interface block member does not match "
6780 "the interface block (%u vs %u)", qual_stream
,
6786 unsigned explicit_xfb_buffer
= 0;
6787 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6788 unsigned qual_xfb_buffer
;
6789 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6790 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6791 explicit_xfb_buffer
= 1;
6792 if (qual_xfb_buffer
!= block_xfb_buffer
)
6793 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6794 "interface block member does not match "
6795 "the interface block (%u vs %u)",
6796 qual_xfb_buffer
, block_xfb_buffer
);
6798 xfb_buffer
= (int) qual_xfb_buffer
;
6801 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
6802 xfb_buffer
= (int) block_xfb_buffer
;
6805 int xfb_stride
= -1;
6806 if (qual
->flags
.q
.explicit_xfb_stride
) {
6807 unsigned qual_xfb_stride
;
6808 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6809 qual
->xfb_stride
, &qual_xfb_stride
)) {
6810 xfb_stride
= (int) qual_xfb_stride
;
6814 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6815 _mesa_glsl_error(&loc
, state
,
6816 "interpolation qualifiers cannot be used "
6817 "with uniform interface blocks");
6820 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6821 qual
->has_auxiliary_storage()) {
6822 _mesa_glsl_error(&loc
, state
,
6823 "auxiliary storage qualifiers cannot be used "
6824 "in uniform blocks or structures.");
6827 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6828 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6829 _mesa_glsl_error(&loc
, state
,
6830 "row_major and column_major can only be "
6831 "applied to interface blocks");
6833 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6836 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6837 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6838 "readonly and writeonly.");
6841 foreach_list_typed (ast_declaration
, decl
, link
,
6842 &decl_list
->declarations
) {
6843 YYLTYPE loc
= decl
->get_location();
6845 if (!allow_reserved_names
)
6846 validate_identifier(decl
->identifier
, loc
, state
);
6848 const struct glsl_type
*field_type
=
6849 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6850 validate_array_dimensions(field_type
, state
, &loc
);
6851 fields
[i
].type
= field_type
;
6852 fields
[i
].name
= decl
->identifier
;
6853 fields
[i
].interpolation
=
6854 interpret_interpolation_qualifier(qual
, field_type
,
6855 var_mode
, state
, &loc
);
6856 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6857 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6858 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6859 fields
[i
].precision
= qual
->precision
;
6860 fields
[i
].offset
= -1;
6861 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6862 fields
[i
].xfb_buffer
= xfb_buffer
;
6863 fields
[i
].xfb_stride
= xfb_stride
;
6865 if (qual
->flags
.q
.explicit_location
) {
6866 unsigned qual_location
;
6867 if (process_qualifier_constant(state
, &loc
, "location",
6868 qual
->location
, &qual_location
)) {
6869 fields
[i
].location
= qual_location
+
6870 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
6871 expl_location
= fields
[i
].location
+
6872 fields
[i
].type
->count_attribute_slots(false);
6875 if (layout
&& layout
->flags
.q
.explicit_location
) {
6876 fields
[i
].location
= expl_location
;
6877 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6879 fields
[i
].location
= -1;
6883 /* Offset can only be used with std430 and std140 layouts an initial
6884 * value of 0 is used for error detection.
6890 if (qual
->flags
.q
.row_major
||
6891 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6897 if(layout
->flags
.q
.std140
) {
6898 align
= field_type
->std140_base_alignment(row_major
);
6899 size
= field_type
->std140_size(row_major
);
6900 } else if (layout
->flags
.q
.std430
) {
6901 align
= field_type
->std430_base_alignment(row_major
);
6902 size
= field_type
->std430_size(row_major
);
6906 if (qual
->flags
.q
.explicit_offset
) {
6907 unsigned qual_offset
;
6908 if (process_qualifier_constant(state
, &loc
, "offset",
6909 qual
->offset
, &qual_offset
)) {
6910 if (align
!= 0 && size
!= 0) {
6911 if (next_offset
> qual_offset
)
6912 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6913 "offset overlaps previous member");
6915 if (qual_offset
% align
) {
6916 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6917 "must be a multiple of the base "
6918 "alignment of %s", field_type
->name
);
6920 fields
[i
].offset
= qual_offset
;
6921 next_offset
= glsl_align(qual_offset
+ size
, align
);
6923 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6924 "with std430 and std140 layouts");
6929 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6930 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6932 if (align
== 0 || size
== 0) {
6933 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6934 "std430 and std140 layouts");
6935 } else if (qual
->flags
.q
.explicit_align
) {
6936 unsigned member_align
;
6937 if (process_qualifier_constant(state
, &loc
, "align",
6938 qual
->align
, &member_align
)) {
6939 if (member_align
== 0 ||
6940 member_align
& (member_align
- 1)) {
6941 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6942 "in not a power of 2");
6944 fields
[i
].offset
= glsl_align(offset
, member_align
);
6945 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6949 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6950 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6952 } else if (!qual
->flags
.q
.explicit_offset
) {
6953 if (align
!= 0 && size
!= 0)
6954 next_offset
= glsl_align(next_offset
+ size
, align
);
6957 /* From the ARB_enhanced_layouts spec:
6959 * "The given offset applies to the first component of the first
6960 * member of the qualified entity. Then, within the qualified
6961 * entity, subsequent components are each assigned, in order, to
6962 * the next available offset aligned to a multiple of that
6963 * component's size. Aggregate types are flattened down to the
6964 * component level to get this sequence of components."
6966 if (qual
->flags
.q
.explicit_xfb_offset
) {
6967 unsigned xfb_offset
;
6968 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
6969 qual
->offset
, &xfb_offset
)) {
6970 fields
[i
].offset
= xfb_offset
;
6971 block_xfb_offset
= fields
[i
].offset
+
6972 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6975 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
6976 unsigned align
= field_type
->is_64bit() ? 8 : 4;
6977 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
6979 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6983 /* Propogate row- / column-major information down the fields of the
6984 * structure or interface block. Structures need this data because
6985 * the structure may contain a structure that contains ... a matrix
6986 * that need the proper layout.
6988 if (is_interface
&& layout
&&
6989 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6990 (field_type
->without_array()->is_matrix()
6991 || field_type
->without_array()->is_record())) {
6992 /* If no layout is specified for the field, inherit the layout
6995 fields
[i
].matrix_layout
= matrix_layout
;
6997 if (qual
->flags
.q
.row_major
)
6998 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6999 else if (qual
->flags
.q
.column_major
)
7000 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7002 /* If we're processing an uniform or buffer block, the matrix
7003 * layout must be decided by this point.
7005 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7006 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7009 /* Image qualifiers are allowed on buffer variables, which can only
7010 * be defined inside shader storage buffer objects
7012 if (layout
&& var_mode
== ir_var_shader_storage
) {
7013 /* For readonly and writeonly qualifiers the field definition,
7014 * if set, overwrites the layout qualifier.
7016 if (qual
->flags
.q
.read_only
) {
7017 fields
[i
].image_read_only
= true;
7018 fields
[i
].image_write_only
= false;
7019 } else if (qual
->flags
.q
.write_only
) {
7020 fields
[i
].image_read_only
= false;
7021 fields
[i
].image_write_only
= true;
7023 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
7024 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
7027 /* For other qualifiers, we set the flag if either the layout
7028 * qualifier or the field qualifier are set
7030 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
7031 layout
->flags
.q
.coherent
;
7032 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
7033 layout
->flags
.q
._volatile
;
7034 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
7035 layout
->flags
.q
.restrict_flag
;
7042 assert(i
== decl_count
);
7044 *fields_ret
= fields
;
7050 ast_struct_specifier::hir(exec_list
*instructions
,
7051 struct _mesa_glsl_parse_state
*state
)
7053 YYLTYPE loc
= this->get_location();
7055 unsigned expl_location
= 0;
7056 if (layout
&& layout
->flags
.q
.explicit_location
) {
7057 if (!process_qualifier_constant(state
, &loc
, "location",
7058 layout
->location
, &expl_location
)) {
7061 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7065 glsl_struct_field
*fields
;
7066 unsigned decl_count
=
7067 ast_process_struct_or_iface_block_members(instructions
,
7069 &this->declarations
,
7072 GLSL_MATRIX_LAYOUT_INHERITED
,
7073 false /* allow_reserved_names */,
7076 0, /* for interface only */
7077 0, /* for interface only */
7078 0, /* for interface only */
7080 0 /* for interface only */);
7082 validate_identifier(this->name
, loc
, state
);
7084 const glsl_type
*t
=
7085 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7087 if (!state
->symbols
->add_type(name
, t
)) {
7088 const glsl_type
*match
= state
->symbols
->get_type(name
);
7089 /* allow struct matching for desktop GL - older UE4 does this */
7090 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
7091 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7093 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7095 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7097 state
->num_user_structures
+ 1);
7099 s
[state
->num_user_structures
] = t
;
7100 state
->user_structures
= s
;
7101 state
->num_user_structures
++;
7105 /* Structure type definitions do not have r-values.
7112 * Visitor class which detects whether a given interface block has been used.
7114 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7117 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7118 : mode(mode
), block(block
), found(false)
7122 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7124 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7128 return visit_continue
;
7131 bool usage_found() const
7137 ir_variable_mode mode
;
7138 const glsl_type
*block
;
7143 is_unsized_array_last_element(ir_variable
*v
)
7145 const glsl_type
*interface_type
= v
->get_interface_type();
7146 int length
= interface_type
->length
;
7148 assert(v
->type
->is_unsized_array());
7150 /* Check if it is the last element of the interface */
7151 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7157 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7159 var
->data
.image_read_only
= field
.image_read_only
;
7160 var
->data
.image_write_only
= field
.image_write_only
;
7161 var
->data
.image_coherent
= field
.image_coherent
;
7162 var
->data
.image_volatile
= field
.image_volatile
;
7163 var
->data
.image_restrict
= field
.image_restrict
;
7167 ast_interface_block::hir(exec_list
*instructions
,
7168 struct _mesa_glsl_parse_state
*state
)
7170 YYLTYPE loc
= this->get_location();
7172 /* Interface blocks must be declared at global scope */
7173 if (state
->current_function
!= NULL
) {
7174 _mesa_glsl_error(&loc
, state
,
7175 "Interface block `%s' must be declared "
7180 /* Validate qualifiers:
7182 * - Layout Qualifiers as per the table in Section 4.4
7183 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7185 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7188 * "Additionally, memory qualifiers may also be used in the declaration
7189 * of shader storage blocks"
7191 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7192 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7193 * Layout Qualifiers) of the GLSL 4.50 spec says:
7195 * "The std430 qualifier is supported only for shader storage blocks;
7196 * using std430 on a uniform block will result in a compile-time error."
7198 ast_type_qualifier allowed_blk_qualifiers
;
7199 allowed_blk_qualifiers
.flags
.i
= 0;
7200 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7201 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7202 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7203 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7204 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7205 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7206 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7207 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7208 if (this->layout
.flags
.q
.buffer
) {
7209 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7210 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7211 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7212 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7213 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7214 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7215 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7217 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7220 /* Interface block */
7221 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7223 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7224 if (this->layout
.flags
.q
.out
) {
7225 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7226 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7227 state
->stage
== MESA_SHADER_TESS_CTRL
||
7228 state
->stage
== MESA_SHADER_TESS_EVAL
||
7229 state
->stage
== MESA_SHADER_VERTEX
) {
7230 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7231 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7232 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7233 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7234 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7235 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7236 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7237 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7239 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7240 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7244 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7245 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7246 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7251 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7252 "invalid qualifier for block",
7255 /* The ast_interface_block has a list of ast_declarator_lists. We
7256 * need to turn those into ir_variables with an association
7257 * with this uniform block.
7259 enum glsl_interface_packing packing
;
7260 if (this->layout
.flags
.q
.shared
) {
7261 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7262 } else if (this->layout
.flags
.q
.packed
) {
7263 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7264 } else if (this->layout
.flags
.q
.std430
) {
7265 packing
= GLSL_INTERFACE_PACKING_STD430
;
7267 /* The default layout is std140.
7269 packing
= GLSL_INTERFACE_PACKING_STD140
;
7272 ir_variable_mode var_mode
;
7273 const char *iface_type_name
;
7274 if (this->layout
.flags
.q
.in
) {
7275 var_mode
= ir_var_shader_in
;
7276 iface_type_name
= "in";
7277 } else if (this->layout
.flags
.q
.out
) {
7278 var_mode
= ir_var_shader_out
;
7279 iface_type_name
= "out";
7280 } else if (this->layout
.flags
.q
.uniform
) {
7281 var_mode
= ir_var_uniform
;
7282 iface_type_name
= "uniform";
7283 } else if (this->layout
.flags
.q
.buffer
) {
7284 var_mode
= ir_var_shader_storage
;
7285 iface_type_name
= "buffer";
7287 var_mode
= ir_var_auto
;
7288 iface_type_name
= "UNKNOWN";
7289 assert(!"interface block layout qualifier not found!");
7292 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7293 if (this->layout
.flags
.q
.row_major
)
7294 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7295 else if (this->layout
.flags
.q
.column_major
)
7296 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7298 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7299 exec_list declared_variables
;
7300 glsl_struct_field
*fields
;
7302 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7303 * that we don't have incompatible qualifiers
7305 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7306 _mesa_glsl_error(&loc
, state
,
7307 "Interface block sets both readonly and writeonly");
7310 unsigned qual_stream
;
7311 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7313 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7314 /* If the stream qualifier is invalid it doesn't make sense to continue
7315 * on and try to compare stream layouts on member variables against it
7316 * so just return early.
7321 unsigned qual_xfb_buffer
;
7322 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7323 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7324 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7328 unsigned qual_xfb_offset
;
7329 if (layout
.flags
.q
.explicit_xfb_offset
) {
7330 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7331 layout
.offset
, &qual_xfb_offset
)) {
7336 unsigned qual_xfb_stride
;
7337 if (layout
.flags
.q
.explicit_xfb_stride
) {
7338 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7339 layout
.xfb_stride
, &qual_xfb_stride
)) {
7344 unsigned expl_location
= 0;
7345 if (layout
.flags
.q
.explicit_location
) {
7346 if (!process_qualifier_constant(state
, &loc
, "location",
7347 layout
.location
, &expl_location
)) {
7350 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7351 : VARYING_SLOT_VAR0
;
7355 unsigned expl_align
= 0;
7356 if (layout
.flags
.q
.explicit_align
) {
7357 if (!process_qualifier_constant(state
, &loc
, "align",
7358 layout
.align
, &expl_align
)) {
7361 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7362 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7369 unsigned int num_variables
=
7370 ast_process_struct_or_iface_block_members(&declared_variables
,
7372 &this->declarations
,
7376 redeclaring_per_vertex
,
7385 if (!redeclaring_per_vertex
) {
7386 validate_identifier(this->block_name
, loc
, state
);
7388 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7390 * "Block names have no other use within a shader beyond interface
7391 * matching; it is a compile-time error to use a block name at global
7392 * scope for anything other than as a block name."
7394 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7395 if (var
&& !var
->type
->is_interface()) {
7396 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7397 "already used in the scope.",
7402 const glsl_type
*earlier_per_vertex
= NULL
;
7403 if (redeclaring_per_vertex
) {
7404 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7405 * the named interface block gl_in, we can find it by looking at the
7406 * previous declaration of gl_in. Otherwise we can find it by looking
7407 * at the previous decalartion of any of the built-in outputs,
7410 * Also check that the instance name and array-ness of the redeclaration
7414 case ir_var_shader_in
:
7415 if (ir_variable
*earlier_gl_in
=
7416 state
->symbols
->get_variable("gl_in")) {
7417 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7419 _mesa_glsl_error(&loc
, state
,
7420 "redeclaration of gl_PerVertex input not allowed "
7422 _mesa_shader_stage_to_string(state
->stage
));
7424 if (this->instance_name
== NULL
||
7425 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7426 !this->array_specifier
->is_single_dimension()) {
7427 _mesa_glsl_error(&loc
, state
,
7428 "gl_PerVertex input must be redeclared as "
7432 case ir_var_shader_out
:
7433 if (ir_variable
*earlier_gl_Position
=
7434 state
->symbols
->get_variable("gl_Position")) {
7435 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7436 } else if (ir_variable
*earlier_gl_out
=
7437 state
->symbols
->get_variable("gl_out")) {
7438 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7440 _mesa_glsl_error(&loc
, state
,
7441 "redeclaration of gl_PerVertex output not "
7442 "allowed in the %s shader",
7443 _mesa_shader_stage_to_string(state
->stage
));
7445 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7446 if (this->instance_name
== NULL
||
7447 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7448 _mesa_glsl_error(&loc
, state
,
7449 "gl_PerVertex output must be redeclared as "
7453 if (this->instance_name
!= NULL
) {
7454 _mesa_glsl_error(&loc
, state
,
7455 "gl_PerVertex output may not be redeclared with "
7456 "an instance name");
7461 _mesa_glsl_error(&loc
, state
,
7462 "gl_PerVertex must be declared as an input or an "
7467 if (earlier_per_vertex
== NULL
) {
7468 /* An error has already been reported. Bail out to avoid null
7469 * dereferences later in this function.
7474 /* Copy locations from the old gl_PerVertex interface block. */
7475 for (unsigned i
= 0; i
< num_variables
; i
++) {
7476 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7478 _mesa_glsl_error(&loc
, state
,
7479 "redeclaration of gl_PerVertex must be a subset "
7480 "of the built-in members of gl_PerVertex");
7482 fields
[i
].location
=
7483 earlier_per_vertex
->fields
.structure
[j
].location
;
7485 earlier_per_vertex
->fields
.structure
[j
].offset
;
7486 fields
[i
].interpolation
=
7487 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7488 fields
[i
].centroid
=
7489 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7491 earlier_per_vertex
->fields
.structure
[j
].sample
;
7493 earlier_per_vertex
->fields
.structure
[j
].patch
;
7494 fields
[i
].precision
=
7495 earlier_per_vertex
->fields
.structure
[j
].precision
;
7496 fields
[i
].explicit_xfb_buffer
=
7497 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7498 fields
[i
].xfb_buffer
=
7499 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7500 fields
[i
].xfb_stride
=
7501 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7505 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7508 * If a built-in interface block is redeclared, it must appear in
7509 * the shader before any use of any member included in the built-in
7510 * declaration, or a compilation error will result.
7512 * This appears to be a clarification to the behaviour established for
7513 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7514 * regardless of GLSL version.
7516 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7517 v
.run(instructions
);
7518 if (v
.usage_found()) {
7519 _mesa_glsl_error(&loc
, state
,
7520 "redeclaration of a built-in interface block must "
7521 "appear before any use of any member of the "
7526 const glsl_type
*block_type
=
7527 glsl_type::get_interface_instance(fields
,
7531 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7534 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7536 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7537 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7540 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7541 YYLTYPE loc
= this->get_location();
7542 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7543 "already taken in the current scope",
7544 this->block_name
, iface_type_name
);
7547 /* Since interface blocks cannot contain statements, it should be
7548 * impossible for the block to generate any instructions.
7550 assert(declared_variables
.is_empty());
7552 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7554 * Geometry shader input variables get the per-vertex values written
7555 * out by vertex shader output variables of the same names. Since a
7556 * geometry shader operates on a set of vertices, each input varying
7557 * variable (or input block, see interface blocks below) needs to be
7558 * declared as an array.
7560 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7561 var_mode
== ir_var_shader_in
) {
7562 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7563 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7564 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7565 !this->layout
.flags
.q
.patch
&&
7566 this->array_specifier
== NULL
&&
7567 var_mode
== ir_var_shader_in
) {
7568 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7569 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7570 !this->layout
.flags
.q
.patch
&&
7571 this->array_specifier
== NULL
&&
7572 var_mode
== ir_var_shader_out
) {
7573 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7577 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7580 * "If an instance name (instance-name) is used, then it puts all the
7581 * members inside a scope within its own name space, accessed with the
7582 * field selector ( . ) operator (analogously to structures)."
7584 if (this->instance_name
) {
7585 if (redeclaring_per_vertex
) {
7586 /* When a built-in in an unnamed interface block is redeclared,
7587 * get_variable_being_redeclared() calls
7588 * check_builtin_array_max_size() to make sure that built-in array
7589 * variables aren't redeclared to illegal sizes. But we're looking
7590 * at a redeclaration of a named built-in interface block. So we
7591 * have to manually call check_builtin_array_max_size() for all parts
7592 * of the interface that are arrays.
7594 for (unsigned i
= 0; i
< num_variables
; i
++) {
7595 if (fields
[i
].type
->is_array()) {
7596 const unsigned size
= fields
[i
].type
->array_size();
7597 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7601 validate_identifier(this->instance_name
, loc
, state
);
7606 if (this->array_specifier
!= NULL
) {
7607 const glsl_type
*block_array_type
=
7608 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7610 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7612 * For uniform blocks declared an array, each individual array
7613 * element corresponds to a separate buffer object backing one
7614 * instance of the block. As the array size indicates the number
7615 * of buffer objects needed, uniform block array declarations
7616 * must specify an array size.
7618 * And a few paragraphs later:
7620 * Geometry shader input blocks must be declared as arrays and
7621 * follow the array declaration and linking rules for all
7622 * geometry shader inputs. All other input and output block
7623 * arrays must specify an array size.
7625 * The same applies to tessellation shaders.
7627 * The upshot of this is that the only circumstance where an
7628 * interface array size *doesn't* need to be specified is on a
7629 * geometry shader input, tessellation control shader input,
7630 * tessellation control shader output, and tessellation evaluation
7633 if (block_array_type
->is_unsized_array()) {
7634 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7635 state
->stage
== MESA_SHADER_TESS_CTRL
||
7636 state
->stage
== MESA_SHADER_TESS_EVAL
;
7637 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7639 if (this->layout
.flags
.q
.in
) {
7641 _mesa_glsl_error(&loc
, state
,
7642 "unsized input block arrays not allowed in "
7644 _mesa_shader_stage_to_string(state
->stage
));
7645 } else if (this->layout
.flags
.q
.out
) {
7647 _mesa_glsl_error(&loc
, state
,
7648 "unsized output block arrays not allowed in "
7650 _mesa_shader_stage_to_string(state
->stage
));
7652 /* by elimination, this is a uniform block array */
7653 _mesa_glsl_error(&loc
, state
,
7654 "unsized uniform block arrays not allowed in "
7656 _mesa_shader_stage_to_string(state
->stage
));
7660 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7662 * * Arrays of arrays of blocks are not allowed
7664 if (state
->es_shader
&& block_array_type
->is_array() &&
7665 block_array_type
->fields
.array
->is_array()) {
7666 _mesa_glsl_error(&loc
, state
,
7667 "arrays of arrays interface blocks are "
7671 var
= new(state
) ir_variable(block_array_type
,
7672 this->instance_name
,
7675 var
= new(state
) ir_variable(block_type
,
7676 this->instance_name
,
7680 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7681 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7683 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7684 var
->data
.read_only
= true;
7686 var
->data
.patch
= this->layout
.flags
.q
.patch
;
7688 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7689 handle_geometry_shader_input_decl(state
, loc
, var
);
7690 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7691 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7692 handle_tess_shader_input_decl(state
, loc
, var
);
7693 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7694 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7696 for (unsigned i
= 0; i
< num_variables
; i
++) {
7697 if (var
->data
.mode
== ir_var_shader_storage
)
7698 apply_memory_qualifiers(var
, fields
[i
]);
7701 if (ir_variable
*earlier
=
7702 state
->symbols
->get_variable(this->instance_name
)) {
7703 if (!redeclaring_per_vertex
) {
7704 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7705 this->instance_name
);
7707 earlier
->data
.how_declared
= ir_var_declared_normally
;
7708 earlier
->type
= var
->type
;
7709 earlier
->reinit_interface_type(block_type
);
7712 if (this->layout
.flags
.q
.explicit_binding
) {
7713 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7717 var
->data
.stream
= qual_stream
;
7718 if (layout
.flags
.q
.explicit_location
) {
7719 var
->data
.location
= expl_location
;
7720 var
->data
.explicit_location
= true;
7723 state
->symbols
->add_variable(var
);
7724 instructions
->push_tail(var
);
7727 /* In order to have an array size, the block must also be declared with
7730 assert(this->array_specifier
== NULL
);
7732 for (unsigned i
= 0; i
< num_variables
; i
++) {
7734 new(state
) ir_variable(fields
[i
].type
,
7735 ralloc_strdup(state
, fields
[i
].name
),
7737 var
->data
.interpolation
= fields
[i
].interpolation
;
7738 var
->data
.centroid
= fields
[i
].centroid
;
7739 var
->data
.sample
= fields
[i
].sample
;
7740 var
->data
.patch
= fields
[i
].patch
;
7741 var
->data
.stream
= qual_stream
;
7742 var
->data
.location
= fields
[i
].location
;
7744 if (fields
[i
].location
!= -1)
7745 var
->data
.explicit_location
= true;
7747 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7748 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7750 if (fields
[i
].offset
!= -1)
7751 var
->data
.explicit_xfb_offset
= true;
7752 var
->data
.offset
= fields
[i
].offset
;
7754 var
->init_interface_type(block_type
);
7756 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7757 var
->data
.read_only
= true;
7759 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7760 if (state
->es_shader
) {
7761 var
->data
.precision
=
7762 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7766 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7767 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7768 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7770 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7773 if (var
->data
.mode
== ir_var_shader_storage
)
7774 apply_memory_qualifiers(var
, fields
[i
]);
7776 /* Examine var name here since var may get deleted in the next call */
7777 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7779 if (redeclaring_per_vertex
) {
7780 ir_variable
*earlier
=
7781 get_variable_being_redeclared(var
, loc
, state
,
7782 true /* allow_all_redeclarations */);
7783 if (!var_is_gl_id
|| earlier
== NULL
) {
7784 _mesa_glsl_error(&loc
, state
,
7785 "redeclaration of gl_PerVertex can only "
7786 "include built-in variables");
7787 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7788 _mesa_glsl_error(&loc
, state
,
7789 "`%s' has already been redeclared",
7792 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7793 earlier
->reinit_interface_type(block_type
);
7798 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7799 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7801 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7802 * The UBO declaration itself doesn't get an ir_variable unless it
7803 * has an instance name. This is ugly.
7805 if (this->layout
.flags
.q
.explicit_binding
) {
7806 apply_explicit_binding(state
, &loc
, var
,
7807 var
->get_interface_type(), &this->layout
);
7810 if (var
->type
->is_unsized_array()) {
7811 if (var
->is_in_shader_storage_block()) {
7812 if (is_unsized_array_last_element(var
)) {
7813 var
->data
.from_ssbo_unsized_array
= true;
7816 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7818 * "If an array is declared as the last member of a shader storage
7819 * block and the size is not specified at compile-time, it is
7820 * sized at run-time. In all other cases, arrays are sized only
7823 if (state
->es_shader
) {
7824 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
7825 "definition: only last member of a shader "
7826 "storage block can be defined as unsized "
7827 "array", fields
[i
].name
);
7832 state
->symbols
->add_variable(var
);
7833 instructions
->push_tail(var
);
7836 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7837 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7839 * It is also a compilation error ... to redeclare a built-in
7840 * block and then use a member from that built-in block that was
7841 * not included in the redeclaration.
7843 * This appears to be a clarification to the behaviour established
7844 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7845 * behaviour regardless of GLSL version.
7847 * To prevent the shader from using a member that was not included in
7848 * the redeclaration, we disable any ir_variables that are still
7849 * associated with the old declaration of gl_PerVertex (since we've
7850 * already updated all of the variables contained in the new
7851 * gl_PerVertex to point to it).
7853 * As a side effect this will prevent
7854 * validate_intrastage_interface_blocks() from getting confused and
7855 * thinking there are conflicting definitions of gl_PerVertex in the
7858 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7859 ir_variable
*const var
= node
->as_variable();
7861 var
->get_interface_type() == earlier_per_vertex
&&
7862 var
->data
.mode
== var_mode
) {
7863 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7864 _mesa_glsl_error(&loc
, state
,
7865 "redeclaration of gl_PerVertex cannot "
7866 "follow a redeclaration of `%s'",
7869 state
->symbols
->disable_variable(var
->name
);
7881 ast_tcs_output_layout::hir(exec_list
*instructions
,
7882 struct _mesa_glsl_parse_state
*state
)
7884 YYLTYPE loc
= this->get_location();
7886 unsigned num_vertices
;
7887 if (!state
->out_qualifier
->vertices
->
7888 process_qualifier_constant(state
, "vertices", &num_vertices
,
7890 /* return here to stop cascading incorrect error messages */
7894 /* If any shader outputs occurred before this declaration and specified an
7895 * array size, make sure the size they specified is consistent with the
7898 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7899 _mesa_glsl_error(&loc
, state
,
7900 "this tessellation control shader output layout "
7901 "specifies %u vertices, but a previous output "
7902 "is declared with size %u",
7903 num_vertices
, state
->tcs_output_size
);
7907 state
->tcs_output_vertices_specified
= true;
7909 /* If any shader outputs occurred before this declaration and did not
7910 * specify an array size, their size is determined now.
7912 foreach_in_list (ir_instruction
, node
, instructions
) {
7913 ir_variable
*var
= node
->as_variable();
7914 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7917 /* Note: Not all tessellation control shader output are arrays. */
7918 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7921 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7922 _mesa_glsl_error(&loc
, state
,
7923 "this tessellation control shader output layout "
7924 "specifies %u vertices, but an access to element "
7925 "%u of output `%s' already exists", num_vertices
,
7926 var
->data
.max_array_access
, var
->name
);
7928 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7938 ast_gs_input_layout::hir(exec_list
*instructions
,
7939 struct _mesa_glsl_parse_state
*state
)
7941 YYLTYPE loc
= this->get_location();
7943 /* Should have been prevented by the parser. */
7944 assert(!state
->gs_input_prim_type_specified
7945 || state
->in_qualifier
->prim_type
== this->prim_type
);
7947 /* If any shader inputs occurred before this declaration and specified an
7948 * array size, make sure the size they specified is consistent with the
7951 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7952 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7953 _mesa_glsl_error(&loc
, state
,
7954 "this geometry shader input layout implies %u vertices"
7955 " per primitive, but a previous input is declared"
7956 " with size %u", num_vertices
, state
->gs_input_size
);
7960 state
->gs_input_prim_type_specified
= true;
7962 /* If any shader inputs occurred before this declaration and did not
7963 * specify an array size, their size is determined now.
7965 foreach_in_list(ir_instruction
, node
, instructions
) {
7966 ir_variable
*var
= node
->as_variable();
7967 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7970 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7974 if (var
->type
->is_unsized_array()) {
7975 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7976 _mesa_glsl_error(&loc
, state
,
7977 "this geometry shader input layout implies %u"
7978 " vertices, but an access to element %u of input"
7979 " `%s' already exists", num_vertices
,
7980 var
->data
.max_array_access
, var
->name
);
7982 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7993 ast_cs_input_layout::hir(exec_list
*instructions
,
7994 struct _mesa_glsl_parse_state
*state
)
7996 YYLTYPE loc
= this->get_location();
7998 /* From the ARB_compute_shader specification:
8000 * If the local size of the shader in any dimension is greater
8001 * than the maximum size supported by the implementation for that
8002 * dimension, a compile-time error results.
8004 * It is not clear from the spec how the error should be reported if
8005 * the total size of the work group exceeds
8006 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8007 * report it at compile time as well.
8009 GLuint64 total_invocations
= 1;
8010 unsigned qual_local_size
[3];
8011 for (int i
= 0; i
< 3; i
++) {
8013 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8015 /* Infer a local_size of 1 for unspecified dimensions */
8016 if (this->local_size
[i
] == NULL
) {
8017 qual_local_size
[i
] = 1;
8018 } else if (!this->local_size
[i
]->
8019 process_qualifier_constant(state
, local_size_str
,
8020 &qual_local_size
[i
], false)) {
8021 ralloc_free(local_size_str
);
8024 ralloc_free(local_size_str
);
8026 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8027 _mesa_glsl_error(&loc
, state
,
8028 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8030 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8033 total_invocations
*= qual_local_size
[i
];
8034 if (total_invocations
>
8035 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8036 _mesa_glsl_error(&loc
, state
,
8037 "product of local_sizes exceeds "
8038 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8039 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8044 /* If any compute input layout declaration preceded this one, make sure it
8045 * was consistent with this one.
8047 if (state
->cs_input_local_size_specified
) {
8048 for (int i
= 0; i
< 3; i
++) {
8049 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8050 _mesa_glsl_error(&loc
, state
,
8051 "compute shader input layout does not match"
8052 " previous declaration");
8058 /* The ARB_compute_variable_group_size spec says:
8060 * If a compute shader including a *local_size_variable* qualifier also
8061 * declares a fixed local group size using the *local_size_x*,
8062 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8065 if (state
->cs_input_local_size_variable_specified
) {
8066 _mesa_glsl_error(&loc
, state
,
8067 "compute shader can't include both a variable and a "
8068 "fixed local group size");
8072 state
->cs_input_local_size_specified
= true;
8073 for (int i
= 0; i
< 3; i
++)
8074 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8076 /* We may now declare the built-in constant gl_WorkGroupSize (see
8077 * builtin_variable_generator::generate_constants() for why we didn't
8078 * declare it earlier).
8080 ir_variable
*var
= new(state
->symbols
)
8081 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8082 var
->data
.how_declared
= ir_var_declared_implicitly
;
8083 var
->data
.read_only
= true;
8084 instructions
->push_tail(var
);
8085 state
->symbols
->add_variable(var
);
8086 ir_constant_data data
;
8087 memset(&data
, 0, sizeof(data
));
8088 for (int i
= 0; i
< 3; i
++)
8089 data
.u
[i
] = qual_local_size
[i
];
8090 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8091 var
->constant_initializer
=
8092 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8093 var
->data
.has_initializer
= true;
8100 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8101 exec_list
*instructions
)
8103 bool gl_FragColor_assigned
= false;
8104 bool gl_FragData_assigned
= false;
8105 bool gl_FragSecondaryColor_assigned
= false;
8106 bool gl_FragSecondaryData_assigned
= false;
8107 bool user_defined_fs_output_assigned
= false;
8108 ir_variable
*user_defined_fs_output
= NULL
;
8110 /* It would be nice to have proper location information. */
8112 memset(&loc
, 0, sizeof(loc
));
8114 foreach_in_list(ir_instruction
, node
, instructions
) {
8115 ir_variable
*var
= node
->as_variable();
8117 if (!var
|| !var
->data
.assigned
)
8120 if (strcmp(var
->name
, "gl_FragColor") == 0)
8121 gl_FragColor_assigned
= true;
8122 else if (strcmp(var
->name
, "gl_FragData") == 0)
8123 gl_FragData_assigned
= true;
8124 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8125 gl_FragSecondaryColor_assigned
= true;
8126 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8127 gl_FragSecondaryData_assigned
= true;
8128 else if (!is_gl_identifier(var
->name
)) {
8129 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8130 var
->data
.mode
== ir_var_shader_out
) {
8131 user_defined_fs_output_assigned
= true;
8132 user_defined_fs_output
= var
;
8137 /* From the GLSL 1.30 spec:
8139 * "If a shader statically assigns a value to gl_FragColor, it
8140 * may not assign a value to any element of gl_FragData. If a
8141 * shader statically writes a value to any element of
8142 * gl_FragData, it may not assign a value to
8143 * gl_FragColor. That is, a shader may assign values to either
8144 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8145 * linked together must also consistently write just one of
8146 * these variables. Similarly, if user declared output
8147 * variables are in use (statically assigned to), then the
8148 * built-in variables gl_FragColor and gl_FragData may not be
8149 * assigned to. These incorrect usages all generate compile
8152 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8153 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8154 "`gl_FragColor' and `gl_FragData'");
8155 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8156 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8157 "`gl_FragColor' and `%s'",
8158 user_defined_fs_output
->name
);
8159 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8160 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8161 "`gl_FragSecondaryColorEXT' and"
8162 " `gl_FragSecondaryDataEXT'");
8163 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8164 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8165 "`gl_FragColor' and"
8166 " `gl_FragSecondaryDataEXT'");
8167 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8168 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8170 " `gl_FragSecondaryColorEXT'");
8171 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8172 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8173 "`gl_FragData' and `%s'",
8174 user_defined_fs_output
->name
);
8177 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8178 !state
->EXT_blend_func_extended_enable
) {
8179 _mesa_glsl_error(&loc
, state
,
8180 "Dual source blending requires EXT_blend_func_extended");
8186 remove_per_vertex_blocks(exec_list
*instructions
,
8187 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8189 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8190 * if it exists in this shader type.
8192 const glsl_type
*per_vertex
= NULL
;
8194 case ir_var_shader_in
:
8195 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8196 per_vertex
= gl_in
->get_interface_type();
8198 case ir_var_shader_out
:
8199 if (ir_variable
*gl_Position
=
8200 state
->symbols
->get_variable("gl_Position")) {
8201 per_vertex
= gl_Position
->get_interface_type();
8205 assert(!"Unexpected mode");
8209 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8210 * need to do anything.
8212 if (per_vertex
== NULL
)
8215 /* If the interface block is used by the shader, then we don't need to do
8218 interface_block_usage_visitor
v(mode
, per_vertex
);
8219 v
.run(instructions
);
8220 if (v
.usage_found())
8223 /* Remove any ir_variable declarations that refer to the interface block
8226 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8227 ir_variable
*const var
= node
->as_variable();
8228 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8229 var
->data
.mode
== mode
) {
8230 state
->symbols
->disable_variable(var
->name
);